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WO2019164328A1 - Procédé pour commander une opération d'un terminal dans un système de communication distribué sans fil - Google Patents

Procédé pour commander une opération d'un terminal dans un système de communication distribué sans fil Download PDF

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Publication number
WO2019164328A1
WO2019164328A1 PCT/KR2019/002198 KR2019002198W WO2019164328A1 WO 2019164328 A1 WO2019164328 A1 WO 2019164328A1 KR 2019002198 W KR2019002198 W KR 2019002198W WO 2019164328 A1 WO2019164328 A1 WO 2019164328A1
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WIPO (PCT)
Prior art keywords
terminal
communication
distributed
many
slot
Prior art date
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Ceased
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PCT/KR2019/002198
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English (en)
Korean (ko)
Inventor
황현구
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority claimed from KR1020180021102A external-priority patent/KR20180058667A/ko
Priority claimed from KR1020180021101A external-priority patent/KR20180058666A/ko
Priority claimed from KR1020180035762A external-priority patent/KR20180058669A/ko
Priority claimed from KR1020180046372A external-priority patent/KR20180058672A/ko
Priority claimed from KR1020180046371A external-priority patent/KR20180058671A/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to JP2020544274A priority Critical patent/JP7330201B2/ja
Publication of WO2019164328A1 publication Critical patent/WO2019164328A1/fr
Anticipated expiration legal-status Critical
Priority to JP2023129206A priority patent/JP2023162230A/ja
Priority to JP2025101222A priority patent/JP2025131851A/ja
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5069—Address allocation for group communication, multicast communication or broadcast communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5092—Address allocation by self-assignment, e.g. picking addresses at random and testing if they are already in use
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/50—Service provisioning or reconfiguring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/60—Subscription-based services using application servers or record carriers, e.g. SIM application toolkits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/12—Application layer protocols, e.g. WAP [Wireless Application Protocol]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a method for controlling a terminal in a wireless distributed communication system operating with synchronous TDMA channels.
  • the present invention relates to reference 1 (application number 10-2017-0026778, application number 1-1-2017-0207822-47 collision avoidance method in a synchronous wireless communication system), reference 2 (application number 10-2015-0187458, application number) 1-1-2015-1275581-10, Method for requesting slot control and automatic retransmission for SOTDM in a specific application message channel and Reference 3 (Application No. 10-2018-0014682, Application No. 1-1-2018- 0131792-95, a service method using multiple channels in a synchronous TDMA system), and a terminal control method for actually implementing the same.
  • the present invention relates to a wireless distributed communication system without a representative product that is widely commercialized internationally to date.
  • the present invention relates to a method for setting an address of a terminal in a wireless distributed communication system. More specifically, the present invention relates to an address setting method of mobile, fixed and indoor terminals in a wireless distributed communication system, and a method of utilizing a set address.
  • the present invention also relates to a method in which a wireless terminal automatically recognizes an object and performs communication in a wireless communication system. More specifically, the present invention relates to a method in which a user having a wireless terminal can easily receive a service from an object.
  • the present invention also relates to a method in which a wireless terminal automatically recognizes an object and performs communication in a wireless communication system. More specifically, the present invention relates to a method in which a user having a wireless terminal can easily receive a service from an object.
  • the present invention relates to a method of one-to-many communication in a distributed communication system. More specifically, the present invention relates to a method in which one terminal receives an ACK response after transmitting a packet to a plurality of terminals.
  • the present invention can be utilized for drones to perform one-to-many communication when the drones perform a group flight.
  • the present invention can be utilized when one terminal transmits files to multiple terminals.
  • the present invention relates to a method for performing many-to-many communication in a distributed communication system.
  • the present invention relates to a method of allocating many-to-many communication resources and transmitting many-to-many packets over the allocated resources.
  • CSMA / CA scheduling and carrier sense multiple access / collision avoidance
  • Scheduling is mainly used for a mobile communication base station to efficiently allocate resources to a terminal without collision.
  • CSMA / CA is used in an asynchronous communication method such as WIFI, and is used when several STAs compete to communicate with an AP. Both methods are communication environments with a central control station.
  • Wireless distributed systems that require large-scale connectivity can be commercialized only if collision avoidance is available. Since there is no control station in the wireless distributed system, scheduling by the control station may not be possible. In addition, since CSMA / CA is used in an asynchronous manner, it may not be appropriate in a synchronous manner. In particular, it is difficult for more than 50 people to use WIFI simultaneously using CSMA / CA. Typically, WIFI APs are installed in offices with an estimated 20-25 people.
  • An object of the present invention is to provide a method for wireless distributed terminals to determine communication parameters according to a situation in order to smoothly provide a commercial wireless distributed communication service.
  • An object of the present invention is to provide a method for efficiently setting addresses by terminals in a wireless distributed communication system.
  • An object of the present invention is to provide a method for providing a service based on an address set in a wireless distributed communication system.
  • the present invention can provide a method in which a terminal automatically recognizes a thing and the terminal immediately communicates with the thing.
  • the present invention can provide a thing that the user terminal recognizes and controls.
  • the present invention may provide a method of embedding a driver or program in a thing and downloading it from the thing wirelessly.
  • the present invention may provide a method of operating an object at low power using a tone channel and a tone slot pattern.
  • the present invention can provide a method for updating a driver or a program embedded in a thing.
  • the present invention can provide a method for performing one-to-many communication in a synchronous wireless distributed communication system.
  • the present invention can provide a method for utilizing one-to-many communication in group drone communication, in-vehicle communication, and group wireless file transfer.
  • the present invention can provide a method for transmitting an ACK response in one-to-many communication.
  • the present invention can provide a highly reliable communication and file transfer method in one-to-many communication.
  • the present invention can provide a method for performing many-to-many communication in a synchronous wireless distributed communication system.
  • the present invention can provide a method applied to the field of the group drone communication, inter-vehicle communication, wireless group chat and the like through many-to-many communication.
  • the present invention can provide a method for dynamically allocating resources and transmitting many-to-many packets.
  • the present invention can provide a method for stably performing wireless many-to-many communication even in a mobile terminal.
  • a distributed terminal may provide a method for determining distributed communication parameters in a wireless distributed communication system.
  • the method for determining the distributed communication parameters by the distributed terminal includes generating at least one communication parameter file including distributed communication parameters, embedding the generated at least one communication parameter file in the distributed terminals, embedding the distributed terminals Setting a communication parameter based on the communicated communication parameter files; And updating the embedded communication parameter files periodically or until a designated time by the distributed terminal.
  • a method for setting an address used for wireless distributed communication by an integrated terminal equipped with a wireless distributed communication modem in a wireless distributed communication system may include an address of a wireless distributed terminal using a phone number of a mobile terminal. It may comprise the step of setting.
  • a terminal may automatically provide a method of automatically recognizing and controlling a thing.
  • a method for automatically recognizing and controlling an object may include: embedding a file for recognizing and controlling an object, downloading a file embedded by the terminal through a wireless communication, and using a file downloaded by the terminal. It may include the step of recognizing the object.
  • a terminal allocates a used slot resource for one-to-many communication using a contention substitute channel, and the terminal is allocated. Transmitting a one-to-many communication packet to a plurality of other terminals using one used slot resource, receiving a one-to-many packet from a plurality of terminals, and each terminal receiving the one-to-many packet receives an ACK response to the one-to-many packet And transmitting, by the terminal transmitting the one-to-many packet, ACK responses.
  • a method for a terminal to perform many-to-many communication in a wireless distributed communication system may be provided.
  • the method for performing the many-to-many communication may include allocating slot resources for many-to-many communication, and when a terminal transmits a many-to-many packet, one slot of the allocated many-to-many slots may be allocated to a contention channel having different frequencies. Using the allocated slot resource and transmitting the many-to-many communication packet using the allocated slot resource.
  • the present invention can provide a service based on an address set in a wireless distributed communication system.
  • the terminal automatically recognizes a thing and performs communication, so that a service for the thing can be provided quickly and easily.
  • one-to-many communication can be performed in a synchronous wireless distributed communication system.
  • one-to-many communication can be utilized in group drone communication, in-vehicle communication, and group wireless file transfer.
  • an ACK response can be transmitted in one-to-many communication.
  • many-to-many communication can be performed in a synchronous wireless distributed communication system.
  • the present invention can be applied to fields such as group drone communication, inter-vehicle communication, and wireless group chat through many-to-many communication.
  • resources can be dynamically allocated and many-to-many packets can be transmitted.
  • 1 is a diagram illustrating a channel and a slot.
  • FIG. 2 is a diagram illustrating a traffic light service.
  • 3 is a diagram illustrating variables for determining distributed communication parameters.
  • FIG. 4 is a diagram illustrating an effective date of a built-in communication parameter file updated periodically.
  • 5 illustrates a method of allocating a plurality of fixed broadcast slots.
  • FIG. 6 is a diagram illustrating a method in which a fixed distributed terminal updates an embedded communication parameter file through a mobile distributed terminal.
  • FIG. 7 is a diagram illustrating a method for a fixed distributed terminal to update an embedded communication parameter file through a mobile distributed terminal.
  • FIG. 8 is a diagram illustrating a method in which a mobile distributed terminal updates an embedded communication parameter file through a fixed distributed terminal.
  • FIG. 9 is a diagram illustrating a method for providing fixed parameters to a mobile distributed terminal through a competition parameter file.
  • FIG. 10 is a diagram illustrating a method for a fixed distributed terminal to provide a communication parameter file to a mobile distributed terminal through wired communication negotiation.
  • 11 is a diagram illustrating a method of configuring a plurality of embedded communication parameter files for a wireless distributed terminal.
  • FIG. 12 illustrates a method of configuring an active parameter set used by a distributed modem from a plurality of embedded communication parameter files.
  • 13 is a diagram illustrating various address configurations.
  • FIG. 14 is a diagram illustrating a method for receiving information by an integrated terminal equipped with a wireless distributed modem.
  • FIG. 15 is a diagram illustrating a method for utilizing an integrated terminal equipped with a wireless distributed modem in ship communication in a wireless distributed system.
  • 16 is a diagram illustrating a method for a mobile distributed terminal to calculate its own location using an address of a fixed distributed terminal.
  • 17 is a diagram illustrating a method for requesting status information from various types of wireless distributed terminals existing in a home.
  • FIG. 18 is a diagram illustrating a configuration of a public trust packet according to the present invention.
  • 19 is a diagram illustrating a configuration for checking the reliability of a public trust packet transmitted by a vehicle through wireless distributed communication.
  • 20 is a flowchart illustrating a comparison between a conventional method for recognizing an object and a proposed method.
  • 21 is a block diagram of an apparatus for automatically recognizing a thing.
  • 22 is a flowchart in which a terminal directly downloads a driver or a program from a thing and recognizes and controls the same.
  • FIG. 23 is a flowchart of waking up and recognizing a sleeping object.
  • FIG. 24 is a diagram illustrating a method of using a tone slot pattern to wake up a sleepy object.
  • 25 is a flowchart for selecting an object to be automatically controlled by a program.
  • 26 is a flowchart of a method in which a thing receiving a control signal allows control.
  • 27 is a flowchart of searching for and controlling a thing already recognized by a user terminal.
  • FIG. 29 is a flowchart illustrating a comparison between an existing object recognition control step experienced by a user and an object recognition step when the present invention is applied.
  • FIG. 30 is a diagram illustrating a configuration of a primary channel and a subchannel, and a configuration of a frame and a slot.
  • FIG. 31 illustrates a case where four drones are directed to the same point.
  • 32 is a diagram showing the configuration of a one-to-many packet.
  • 33 is a view showing a method for performing an ACK response to a one-to-many packet proposed by the present invention.
  • 34 is a diagram illustrating a method of transmitting an ACK response for one-to-many communication to a broadcasting slot occupied by each terminal.
  • 35 is a diagram illustrating a method for transmitting an ACK response to a one-to-many packet by transmitting a tone signal in a subslot of a contention tone slot resource.
  • 37 illustrates a method of transmitting a group tone to detect a resource collision.
  • 38 is a diagram illustrating a method of receiving a slot map from each terminal and creating a group valid slot map.
  • FIG. 39 illustrates a method for performing retransmission when the one-to-many packet transmitting terminal does not receive an ACK.
  • 40 is a diagram illustrating a method in which a terminal performs communication in consideration of a boundary of a group communication area.
  • 41 is a diagram illustrating a method for dynamically joining a terminal to a one-to-many group.
  • FIG. 42 is a diagram showing the configuration of a main channel and a sub channel, and a frame and a slot.
  • 44 illustrates a method for performing many-to-many communication.
  • 45 is a diagram illustrating a group valid slot map.
  • 46 is a diagram illustrating a method of performing group slot clearing when performing many-to-many packet transmission.
  • 47 illustrates a method of constructing a one-to-many packet.
  • 48 is a diagram illustrating a method of transmitting response data in each broadcast slot by a drone when many-to-many packets are transmitted in a usage slot.
  • 49 illustrates a method of transmitting a many-to-many packet requesting a condition response.
  • 50 illustrates a method of performing a response to a many-to-many packet having a response condition.
  • 51 is a diagram illustrating a method in which a terminal dynamically joins a many-to-many communication group.
  • FIG. 52 illustrates a method of using a group tone interval and a group tone to check resource collisions of many-to-many slots in real time.
  • 53 is a diagram illustrating a many-to-many packet including sequence information.
  • 54 illustrates a method of managing a packet when a sequence error occurs in a many-to-many packet to be transmitted and received.
  • 55 is a diagram illustrating a method of transmitting a packet indicating a current sequence number when a terminal having a sequence error transmits a many-to-many packet including an incorrect sequence number.
  • 56 is a diagram illustrating a method of performing retransmission by transmitting ACK and NACK for a many-to-many packet as tone signals.
  • FIG. 57 is a diagram illustrating a method for retransmission using the broadcast current sequence number when broadcasting a current sequence number in a many-to-many group information broadcast slot.
  • 58 is a diagram illustrating a method in which a terminal detaches itself from a many-to-many group.
  • Fig. 59 is a diagram showing the device configuration of the present invention.
  • a component when a component is “connected”, “coupled” or “connected” with another component, it is not only a direct connection, but also an indirect connection in which another component exists in between. It may also include.
  • a component when a component “includes” or “having” another component, it means that it may further include another component, without excluding the other component unless otherwise stated. .
  • first and second are used only for the purpose of distinguishing one component from other components, and do not limit the order or the importance between the components unless otherwise specified. Accordingly, within the scope of the present invention, a first component in one embodiment may be referred to as a second component in another embodiment, and likewise, a second component in one embodiment may be referred to as a first component in another embodiment. It may also be called.
  • the components distinguished from each other to clearly describe each feature does not necessarily mean that the components are separated. That is, a plurality of components may be integrated into one hardware or software unit, or one component may be distributed and formed into a plurality of hardware or software units. Therefore, even if not mentioned otherwise, such integrated or distributed embodiments are included in the scope of the present invention.
  • components described in various embodiments of the present disclosure are not necessarily required components, and some of them may be optional components. Therefore, an embodiment consisting of a subset of the components described in one embodiment is also included in the scope of the present invention. In addition, embodiments including other components in addition to the components described in the various embodiments are included in the scope of the present invention.
  • the existing CSMA / CA could only be used in an asynchronous communication system.
  • the contention substitute channel may be used so that the CSMA / CA may be used in the synchronization system.
  • the primary channel and the secondary channel may be paired.
  • the original data channel may have a wide bandwidth of several MHz.
  • the main communication band may be used as the data channel as it is.
  • Competing channels use narrowband signals.
  • a frequency tone can be used as a narrow band signal, and since the frequency tone has a bandwidth of several kHz to several tens of kHz, it has a bandwidth less than 1/100 of the broadband bandwidth.
  • the maximum data channel utilization is 99% under the assumption that there is no collision. This can be very advantageous when using CSMA / CA in the same band, compared to 50% maximum channel utilization.
  • the secondary channel may be allocated immediately adjacent to the primary channel.
  • the subchannel may be allocated away from the main channel, and is not limited to the above-described embodiment.
  • the channel efficiency of the plurality of terminals may be set differently from that of the data transmission channel, thereby improving frequency efficiency.
  • UEs may compete in a slot before a slot to be used.
  • UE A decides to use slot s of the primary channel
  • UE A may perform competition in advance in slot s-1, which is a competition agency channel.
  • the terminal A if the subslot number in the slot of the contention channel is N, it can perform carrier sensing (carrier sensing) to the previous subslot of the selected subslot. If there is no signal detected as a result of the execution, a contention tone signal is transmitted from the selected subslot to the last subslot and data is transmitted in slot s of the main channel.
  • the terminal A may determine that it is lost in contention and may not transmit any signal in the tone channel and the main channel.
  • the above-described sub slot allocation is only one embodiment and is not limited to a specific number. That is, the terminal allocated the lowest number of subslots may transmit a contention signal after carrier sensing and perform data transmission on the primary channel.
  • the signal of the competition agency channel may use a frequency tone signal, and in this case, the frequency band may be used the least.
  • the contention signal is assumed to be a tone signal.
  • the competition signal may be set differently, and is not limited to the above-described embodiment.
  • slot clearing means that a terminal continuously transmits a contention signal starting from subslot 0 in a previous slot s-1 of a competing substitute channel in order to continuously use the slot s without collision. It can mean preventing attempts. That is, it may mean the operation as described above, the following description will be described on the premise.
  • the present invention describes a method for providing various services to a distributed terminal in a distributed communication system based on the above-described bar and references 1 to 3.
  • the distributed communication system may be a system in which terminals operate on their own without a control station for controlling distributed communication as described above. Therefore, communication parameters for controlling distributed terminals of a distributed communication system may be needed.
  • communication parameters of an existing communication system may be a method of implementing hardware. In other words, the parameters of an existing communication system may be fixed.
  • a method of dynamically changing a communication parameter may be a method of transmitting a command to use the corresponding communication parameter as something through broadcast.
  • an AIS terminal mounted on a ship may determine its frequency channel after first receiving DSC channel information. That is, as described above, the operation parameter may be changed, but the method of dynamically changing the communication parameter may be applied only in a very limited case of changing the frequency channel.
  • parameters may be dynamically changed.
  • using fixed parameters in a wireless distributed communication system may make it difficult to provide various services. Therefore, there is a need to dynamically change parameters in consideration of various services in a wireless distributed communication system.
  • the change of the existing communication parameter may mean that a limited communication parameter such as frequency, transmission power, or designated slot information is set differently for each country. Therefore, different parameters in different countries can be stored in advance and changed in the corresponding country.
  • the present invention may consider providing a service in an environment in which a collision is detected and data stability is secured based on the above-mentioned and references 1 to 3 and in which various commercial services are possible in this environment.
  • the terminal using a particular service and those that do not have a communication parameter may be set differently. That is, in the wireless distributed communication system, distributed terminals may set different communication parameters according to their respective situations and perform an operation based on the different communication parameters.
  • the terminal there may be a large number of communication parameters required to control the terminal.
  • a channel performing competition and a channel transmitting actual data may be separate channels having different center frequencies.
  • communication parameters for the frequency and mapping relationship of the two channels may be needed.
  • communication parameters for slot clearing, ACK clearing scheme, and priority setting may be needed.
  • communication parameters for the slot configuration and channel configurations described in Reference 3 may also be needed.
  • the slot configuration includes a broadcast slot and a use slot
  • the channel configuration includes a broadcast channel, a use channel, and a mixed channel.
  • the broadcast slot is divided into a designated broadcast slot, a fixed broadcast slot, and a general broadcast slot
  • the use slot may also be divided into a designated use slot, a fixed use slot, and a general use slot.
  • the broadcast channel is a channel composed of broadcast slots
  • the use channel is a channel composed of use slots
  • the mixed channel is a channel in which a broadcast slot and a use slot are mixed.
  • the communication parameters for the slots described above may be necessary, and the above parameters may be parameters that do not exist in the existing communication system.
  • a plurality of slots and channels may be combined to operate various services through a wireless distributed communication system. Through this, it is possible to provide a variety of services to the user in a non-distributed distributed communication system.
  • the terminal may operate based on a fixed rule, as described above. That is, various services cannot be provided in the existing communication system. For example, when various services are to be provided through the system, a large number of services must be provided immediately without difficulty, and for this purpose, communication parameters need to be changed from time to time.
  • a communication parameter determination method for controlling distributed terminals in a wireless distributed communication system will be described in consideration of the above.
  • the above-described wireless distributed communication system may be a wireless distributed communication system that basically uses synchronous TDMA.
  • the communication resource in the synchronous TDMA is a slot.
  • one frame is one second, and 500 slot resources may exist in one second.
  • the operation of the distributed terminals in the wireless distributed communication system can be controlled.
  • each distributed terminal needs to be controlled from an embedded communication parameter file.
  • the communication parameters may be different for each country or region, and may have other parameters according to a contract or a purpose.
  • communication parameters may vary depending on the services provided.
  • the communication parameter may be set differently by other factors, and is not limited to the above-described embodiment. That is, since the parameters of the wireless distributed system are very flexible, it is necessary for the terminal to periodically update the communication parameter file for controlled operation. For example, a distributed terminal such as a smart device may automatically update.
  • distributed terminals not connected to the Internet may mainly perform an update via a smart device.
  • the distributed road unit of the fixed terminal may be connected to the Internet through the central control station, it may be easy to update the vehicle.
  • reference 4 application number 10-2018-0021102, reception number 1-1-2018-0187213-27, in the wireless distributed communication system to set the address of the terminal and Public trust packet described in "How to utilize.”
  • the built-in communication parameter file can be very large. This is because there are so many parameters involved and how they can be configured. Therefore, it may consist of a plurality of files.
  • the built-in communication parameter file includes a basic parameter file, a location type parameter file according to the location type, a contract parameter file according to the contract, a service parameter file according to the characteristics of the service, and a partitioned area that maps the location to the partitioned area and records related parameters.
  • a parameter file and a parameter conversion file for reducing the size of the file are not limited to the above-described embodiment.
  • the above-mentioned parameter is explained concretely below.
  • the operation may be performed based on a slot resource allocation scheme in a wireless distributed communication system.
  • slot resources may be allocated through collision contention unlike conventional technologies. Therefore, the collision probability for collisions occurring between distributed terminals in the wireless distributed communication system is extremely low, and thus can support tens of thousands and tens of thousands of connections. For example, in a WIFI system, when 50 terminals attempt resource allocation at the same time, a resource collision probability may be about 20%. On the other hand, based on the above, even if 50,000 terminals try to allocate resources simultaneously in the wireless distributed communication system, the collision probability may be as low as about 2%.
  • the above-described wireless distributed communication system may refer to a synchronous TDMA distributed communication system using a channel allocation scheme.
  • allocating slots through contention by distributed terminals may be performed based on the contention agency channel described above.
  • the slot clearing, the ACK clearing technique, and the method for setting the priority described in Reference 1 may be applied, and are not limited to the above-described embodiment.
  • a slot configuration may include a broadcast slot and a use slot
  • a channel configuration may include a broadcast channel, a use channel, and a mixed channel.
  • the broadcast slot may be divided into a designated broadcast slot, a fixed broadcast slot, and a general broadcast slot.
  • Use slots may also be divided into designated use slots, fixed use slots, and general use slots.
  • the broadcast channel may be a channel composed of broadcast slots
  • the use channel may be a channel composed of use slots.
  • the mixed channel is a channel in which a broadcast slot and a use slot are mixed.
  • a distributed modem for a wireless distributed communication system may mean a modem used for modulation and demodulation of a signal.
  • the terminal may refer to a distributed terminal equipped with a distributed modem. However, this is only for convenience of description and is not limited to the above-described embodiment.
  • a distributed modem when installed in the smart device, it may be referred to as a "smart device distributed terminal" or "integrated terminal.”
  • the present invention is not limited to the above-described embodiment, and other names may be possible for the terminal performing the same function.
  • the frame is one second, it may be composed of 500 slots. Also, as an example, one slot may be configured with 56 subslots. In this case, the following slot allocation method may consider the reference 2 described above. In more detail, when the first terminal allocates one slot and transmits information to the second terminal, the second terminal may also send a response using the corresponding slot allocated by the first terminal.
  • the wireless distributed communication system may operate based on the above description, but may be designed in various ways, and may be a distributed communication system having another structure, and is not limited to the above-described embodiment.
  • a method of determining communication parameters of a terminal in a wireless distributed communication system will be described.
  • a control means may be required to replace the base station.
  • distributed communication is a local communication with a limited communication distance
  • a communication parameter reflecting the characteristics of each region may be required for each region.
  • communication parameters may be different for each service, and may be set.
  • distributed terminals may embed communication parameters for each operation.
  • the embedded communication parameter files may be updated periodically or within a specified period.
  • the parameters embedded in the distributed terminal are referred to as an "embedded communication parameter file.”
  • embedded communication parameter file the parameters embedded in the distributed terminal.
  • this is only for convenience, and other names may be used for parameters that perform the same operation, and the present invention is not limited to the above-described embodiment.
  • a new service may not be provided in the wireless distributed communication system.
  • a case where a traffic light information service is newly provided in slot number 0 of a broadcast channel may be considered.
  • the traffic light service as a newly provided service may be a service newly provided from a specific time point. That is, the service may not be provided but newly applied.
  • the wireless distributed communication system (or wireless distributed communication operating system) needs to include information in the communication parameter file that the traffic light service is provided in slot 0 of the broadcast channel. That is, there is a need to add a parameter for necessary information in consideration of the new service.
  • all wireless distributed terminals of the wireless distributed communication system need to update new communication parameter files periodically or within a designated time. For example, the update may be performed until the specific time point described above.
  • the terminal D when the terminal D does not update the communication parameter until the above-mentioned specific time point, the terminal D cannot confirm that the slot 0 is assigned to the traffic light service. That is, the terminal D may allocate slot 0 for other purposes.
  • the terminal A, terminal B and terminal C may use the slot 0 for the traffic light service.
  • the signal transmitted by the terminal D in slot 0 acts as interference, the terminal A, the terminal B, and the terminal C may not properly receive traffic light information.
  • the communication parameter may be updated based on a periodic or constant time in consideration of the above-described situation, and is not limited to the above-described embodiment.
  • the wireless distributed communication system may have different parameter values according to the area, service, or terminal type of the distributed communication.
  • the first region broadcasts traffic light information on broadcast channel '0'
  • the second region may broadcast traffic light information on '1' as shown in FIG. 2 (b).
  • the third region may broadcast traffic light information at '2'. That is, different parameter values may be set according to respective regions.
  • the transmission power of the traffic light signal in the first region is set to 25 dBm
  • the transmission power of the traffic light signal in the second region is set to 28 dBm
  • the transmission power of the traffic light signal in the third region is set to 30 dBm. Can be.
  • the traffic light transmission power may be set to 26 dBm for a specific region within the first region and 29 dBm for another region.
  • different values may be set for specific regions within the same region. Therefore, communication parameters may also be set in consideration of each region or a specific region of the region.
  • the communication parameter may be set differently according to the characteristics of the corresponding distributed terminal.
  • the communication parameter when the distributed terminal is a vehicle that is, when the distributed modem is installed in the car
  • the communication parameter when the distributed terminal is a smart device that is, when the distributed modem is installed on the smart device.
  • communication parameters may be set differently.
  • the distributed terminal may use the same communication scheme but perform different operations depending on the purpose of installation and use. Therefore, the number or type of communication parameters may be different.
  • the same parameter may have different values in consideration of characteristics, and is not limited to the above-described embodiment.
  • communication parameters may be differently set by a user or an operator using a wireless distributed communication system.
  • communication parameters may also vary according to a contract between a distributed carrier and a commercial company.
  • the distributed terminal may not be able to accept it.
  • the transmission power may not be indicated by a communication parameter indicating a transmission power higher than the maximum transmission power of the distributed terminal. That is, in certain cases, communication parameters may not be applied to distributed terminals.
  • the distributed terminal may not perform an operation for transmitting based on a communication parameter. That is, the mobile distributed terminal should determine which location it is in and determine the communication parameters to be used in consideration of its terminal type and service type.
  • the distributed terminal of the wireless distributed communication system may not update its communication parameter file.
  • the distributed terminal may not update the communication parameter.
  • a special service may not be required to be changed, so that a communication parameter may not be updated for a specific distributed terminal, such as when a home appliance is equipped with a distributed modem.
  • the distributed terminal may periodically access the update server through a communication network.
  • an operator of a wireless distributed communication system or a related distributed communication operator may operate a server in consideration of periodic update of a distributed terminal.
  • the distributed terminal when a distributed terminal that periodically updates internal communication parameters does not perform an update, the distributed terminal may be limited in a plurality of functions and services.
  • the function of the distributed terminal may be interrupted.
  • the update if the update is not made like the above-described traffic light service, it may interfere with communication of other distributed terminals, which may cause a problem. That is, the update of the distributed terminal, which must periodically update the internal communication parameters, may be an essential operation for providing a service or a function. Therefore, in the case where the update of the distributed terminal that periodically needs to update the built-in communication parameters is not performed, it is possible to limit the service or function.
  • the distributed terminal may perform an update based on a preset number of times for a preset period.
  • the terminal that needs to periodically update the built-in communication parameters may be a mandatory update terminal. That is, the duty update terminals may periodically update their internal communication parameter files. In this case, the duty update terminals may update the information on the usage period for the updated parameter.
  • the distributed terminal may receive a parameter valid period or a usage period after updating. For example, if the internal communication parameter file update is performed on July 15 in FIG.
  • the available time for the updated parameter may be set in the duty update terminals. For example, the available time period may be set to perform a predetermined number of updates per week, monthly, quarterly or annually.
  • the mobile distributed terminal may update once per month or update once every quarter.
  • an eco-land, a tourist destination in Jeju Island, and a distributed communication service provider may enter into a service contract, and a fixed broadcast slot may be allocated to the eco-land area from September 2018.
  • the case where the fixed slot number among the 500 broadcast slots of the broadcast channel is 200 slots from 100 to 299 may be considered.
  • the operator needs to modify the built-in communication parameter file of the update server to prohibit the transmission of broadcast slots 100 to 299 of all mobile distributed terminals in the ecoland region from September 2018. There is this.
  • the service provider must modify the communication parameter file by the end of July so that all mobile terminals can update their communication parameter file until September starts. have. If, in the above example, a mobile terminal does not update its communication parameter file within one month, transmission of all broadcast slots may be prohibited in an ecoland of the corresponding terminal. As another example, the terminal may not be able to transmit a broadcast slot in all regions of the country. That is, when the duty update terminal does not perform the update, the operation may be limited in order not to affect other terminals.
  • the update of the communication parameter file can be made automatically.
  • the embedded communication parameter file may be updated relatively easily.
  • the update may be performed automatically in the early morning or late night when the user mainly sleeps while connected to Wi-Fi.
  • the wireless distributed communication system may perform automatic update on the smart device.
  • the distributed terminal may not be connected to a communication network, so the update operation may not be smooth.
  • the update operation may not be smooth based on regional restrictions of the distributed terminal. For example, a distributed terminal as a smart device when traveling abroad may not be able to update an internal communication parameter file of a corresponding country.
  • a distributed terminal capable of connecting to a communication network such as a smart device, among the distributed terminals may connect to a server to download a built-in communication parameter file in place of a distributed terminal that is difficult to connect directly to a communication network, and transmit the same so that the update may be performed.
  • the distributed terminal having the Internet connection means may access the update server and download the built-in communication parameter file of the distributed terminal other than its own built-in communication parameter file. Thereafter, the distributed terminal may transmit the downloaded internal communication parameter file of the other distributed terminal to the corresponding distributed terminal using a wireless communication means.
  • the terminal which has downloaded the internal communication parameter file of another terminal may be connected to the update request terminal through distributed communication.
  • a sensing method may be provided by various means in distributed communication. Therefore, when the existence of the update request terminal is detected by the wireless distributed communication, the update providing terminal may automatically update the built-in communication parameter file of the update request terminal through the wireless distributed communication.
  • the integrated terminal such as the smart device may download the built-in communication parameter file of the update request terminal in advance.
  • the user may set the surrogate update of the corresponding terminal in advance to the smart device, which is not limited to the above-described embodiment.
  • the mobile distributed terminal may access the update server through a communication network and request a built-in communication parameter file of the fixed terminal (S610).
  • the mobile distributed terminal receives the fixed terminal received from the update server.
  • the built-in communication parameter file may be stored (S620).
  • the mobile distributed terminal may then detect the fixed terminal as wireless distributed communication. At this time, the detection of the wireless distributed communication is as described above.
  • the mobile distributed terminal detects the fixed distributed terminal (S630)
  • it may transmit a built-in communication parameter file to the fixed distributed terminal (S640).
  • the fixed distributed terminal may detect the distributed signal periodically transmitted by the mobile distributed terminal. Based on this, the built-in communication parameter file may be received and updated.
  • the mobile distributed terminal when the mobile distributed terminal detects a fixed distributed terminal, if there is no pre-downloaded built-in communication parameter file, the mobile distributed terminal may request a built-in communication parameter file to the update server via the communication network to download it. have.
  • the mobile distributed terminal may first detect the fixed terminal through wireless distributed communication.
  • the mobile distributed terminal may request the built-in communication parameter file of the fixed terminal to the update server.
  • the mobile distributed terminal may store the embedded parameter file received from the update server in the mobile distributed terminal.
  • the mobile distributed terminal may transmit a built-in communication parameter file downloaded wirelessly instead to the fixed terminal. That is, since the mobile distributed terminal detects the fixed terminal first but there is no built-in communication parameter file for the fixed terminal, the mobile distributed terminal fixed the fixed terminal after downloading the built-in communication parameter file for the fixed terminal from the update server immediately through the Internet. Can be delivered to the terminal.
  • the distributed terminal installed in the vehicle may update the embedded communication parameter file from the smart device distributed terminal of the vehicle owner as the fixed terminal.
  • the distributed terminal installed in the vehicle may perform distributed communication with the smart terminal through distributed communication.
  • the smart device may consider a case in which only a phone function is roamed and overseas data roaming is prohibited. Therefore, the smart device can manually download the built-in communication parameter file of the region traveling in advance. However, manually downloading communication parameters from a user's point of view may be cumbersome. Therefore, in the present invention, the mobile distributed terminal can automatically download the communication parameter file of the corresponding area.
  • the smart device distributed terminal may automatically store communication parameter information in advance in consideration of the limitation of the communication network due to regional restrictions.
  • a mobile distributed terminal can access a server through the Internet and receive both a mobile terminal communication parameter file and a fixed terminal communication parameter file.
  • the fixed terminal may receive and update its internal communication parameter file from the mobile distributed terminal, and may also receive the internal communication parameter file of the smart device distributed terminal. Thereafter, the fixed terminal may transfer the received internal terminal communication parameters of the mobile terminal back to another mobile terminal. That is, the fixed terminal may relay the built-in communication parameter transmission of another mobile terminal.
  • the fixed distributed terminal may be directly connected to the update server.
  • the fixed distributed terminal may acquire the built-in communication parameter file by itself and perform an update.
  • fixed distributed terminals may receive and store a communication parameter file of a mobile distributed terminal through a communication network.
  • the mobile distributed terminal may receive and update an embedded communication parameter file from the fixed distributed terminal. That is, the distributed terminal may receive and update the embedded communication parameter file through the distributed communication from the fixed distributed terminal.
  • the mobile distributed terminal may transmit a built-in communication parameter update request by allocating a slot to receive a communication parameter file. Thereafter, the fixed distributed terminal may perform a slot occupancy competition to receive the request, and then transmit the update request in a frame after receiving the request.
  • the fixed distributed terminal may be allocated a slot through contention, and transmit a response including an embedded communication parameter file through the assigned slot.
  • fixed distributed terminals may request a communication parameter file for the mobile terminal.
  • the fixed distributed terminal may receive a built-in communication parameter file from the update server and store it. Thereafter, the fixed distributed terminal may receive a communication parameter file update request from the mobile distributed terminal.
  • the fixed distributed terminal may perform an allocation competition for the slot in which the request is received in the next frame of the frame in which the aforementioned request is received. That is, since the fixed distributed terminal needs to be allocated a slot to transmit a response, the fixed distributed terminal may perform contention. Thereafter, when the fixed distributed terminal is allocated a slot through contention, the fixed distributed terminal may wirelessly transmit the update communication parameter file to the corresponding mobile terminal. (S950)
  • the fixed distributed terminals may consider a case in which wired communication may determine which terminal performs a response to the above-described request. That is, in FIG. 9, the fixed distributed terminals may provide built-in communication parameters through the fixed distributed terminal determined by wired communication without having to perform competition for slot occupancy.
  • fixed distributed terminals can perform communication with each other.
  • the fixed distributed terminal receiving the request from the mobile distributed terminal may transmit a response to the slot allocated by the update request terminal.
  • the fixed distributed terminals to provide the update file among the fixed distributed terminals may be determined.
  • the mobile distributed terminal can then receive the embedded communication parameter file from the determined fixed distributed terminal.
  • fixed distributed terminals may request a communication parameter file for the mobile terminal from the update server. Thereafter, the fixed distributed terminals (or fixed distributed terminals) may store the communication parameter file received from the update server. In this case, the fixed distributed terminal may receive a communication parameter file update request from the mobile distributed terminal. In this case, as described above, when the fixed distributed terminals are connected through wired communication, the fixed distributed terminals may determine one fixed distributed terminal to provide the update communication parameter file. A fixed distributed terminal determined through wired communication may provide a communication parameter file to a mobile distributed terminal without contention for slot allocation of the mobile station. (S1050)
  • the above-described built-in communication parameters may be transmitted through wifi direct or Bluetooth. In addition, as described above, it may be transmitted through a wireless distributed communication means, but is not limited to the above-described embodiment.
  • a communication parameter file may be updated by a road side unit (RSU) in a distributed road unit.
  • RSU road side unit
  • the RSU which is a distributed terminal installed on the road, may be connected to a central control station that controls itself. At this time, the central control station may be connected to the communication network. Therefore, the central control station can deliver the built-in communication parameter file used by the vehicle to the RSU of the road, and the RSU on the road can deliver the built-in communication parameter file to the vehicle through distributed communication at the request of the vehicle.
  • the distributed terminal of the vehicle may separately need not only a vehicle communication parameter file used in a traffic system but also a communication parameter file used for wireless distributed communication with a general smart device distributed terminal or a distributed terminal of a store. That is, the built-in communication parameter file for vehicle communication can be used for driving the traffic system and the car.
  • the smart device communication parameter file may be used for the vehicle and the smart device to communicate or the fixed terminal of the vehicle and the store to communicate.
  • the distributed terminal of the vehicle may receive information of a store and perform an order and a payment by using a setting of a smart device communication parameter file. That is, a plurality of communication parameters may be set in one distributed terminal.
  • the vehicle is described as a reference, but it may be obvious that the present invention may be applied to other distributed terminals based on the same method.
  • the above-described distributed road unit may provide a built-in communication parameter file for a vehicle.
  • the vehicle communication parameter file may have a long update period and a small file size, and may also be provided as a distributed road unit.
  • the distributed road unit may provide the smart device communication parameter file as well as the in-vehicle communication parameter file. That is, the distributed road unit (or RSU) may provide information for updating the built-in communication parameters of the vehicle as the distributed terminal, but is not limited to the above-described embodiment.
  • a plurality of embedded communication parameter files may be generated in the distributed terminal.
  • the communication parameter may vary according to a situation.
  • a distributed terminal may consider a case in which a built-in communication parameter file includes 100 parameters and divides one region (eg, one nation or one province) into 10,000 regions. Can be.
  • one communication control parameter is 2 bits
  • the plurality of parameters may be distinguished in order to reduce the size of the communication parameter file.
  • Parameters can be divided into files about parameters that are rarely updated and variably parameters. For example, as described above, 60 parameters among the 100 parameters may be fixed values that are hardly updated in the region. However, this is only one example for convenience of description and is not limited to the above-described embodiment.
  • the parameter that is rarely updated may be performed only when an update is required. That is, the above-described parameters may be updated based on the event trigger.
  • the remaining parameter (e.g. 40) files can be updated periodically. That is, some parameters of the plurality of parameters may be updated based on event triggering, and some parameters may be updated based on a predetermined period.
  • the same parameter may exist in a plurality of files.
  • the parameter values in the high priority file may actually be used.
  • changing the parameter may mean having a higher priority for a file related to a location of a terminal (or user) or a service used by the terminal (or user).
  • the case where there is a basic file including all the parameters and the priority is '0' may be considered.
  • the file related to the city, the file related to the city exterior, the file related to the countryside, the file related to the mountains, the file related to the seashore, and the file related to the sea may exist, and their priority may be '1'.
  • the above description is only one example for convenience of description and is not limited to the above-described embodiment. That is, each file exists based on the user's location or service, and each priority can be set. In this case, as an example, when the location attribute of the terminal (or user) is city, a parameter existing in the city file may be changed among parameters of the basic file.
  • the parameters in the file associated with the city may be applied first.
  • the transmission power is set to 23 dBm in the basic file and the transmission power is set to 25 dBm in the urban file.
  • the transmission power may be 25 dBm based on the above-described parameter change.
  • an emergency rescue service file may have a priority of '2' and a transmission power of '33 dBm '.
  • the terminal changes the parameter based on the emergency rescue service file, and even if the terminal is in the figure, the terminal may transmit the emergency rescue service signal at 33 dBm. That is, the parameter value may change according to the situation of the terminal.
  • the parameter may be changed by replacing an existing value with a new value.
  • the parameter may be changed by adding a change amount to an existing value. As an example, if the transmission power of the file having priority "0" is 23 dBm and the transmission power of the file having priority "1" is +3 dBm, the final transmission power may be changed to 26 dBm.
  • the parameter size may be reduced by additionally generating a parameter conversion file.
  • the frequency value of the channel may be expressed based on a very high precision. Thus, a large number of bits may be needed to represent the frequency value of the channel. For example, when the center frequency of the broadcast channel is 2785.25 MHz, 20 bits or more may be required to represent the above-described frequency.
  • the number of broadcast channels used in one country may be at least one, and may be set to four or less. However, this is only one example and is not limited to the above-described embodiment. Therefore, in the parameter file, channel numbers 0, 1, 2, and 3 can be used by representing the center frequency of the broadcast channel in 2 bits.
  • the parameter conversion file may express detailed frequency values represented by broadcast channel numbers 0, 1, 2, and 3. Therefore, only one parameter conversion file may be needed in one country or region, and the size of the parameter file may be reduced.
  • the size of the embedded file may be reduced by using the location type parameter file in a similar form to the parameter conversion file.
  • the divided area parameter file can be generated as a file for the divided area.
  • the divided region parameter file may specify the type of each divided region.
  • the terminal may check its location and type through a map file in which the location type is set.
  • the type of divided region may be divided into at least one of the city, suburban, rural, coastal, ocean, mountain, forest and river.
  • the above description is just one example, and may be set to another type. That is, different location types may be set for each location.
  • a location type parameter file may be generated for each location type. That is, the parameter may vary depending on the location type. Specifically, the transmission power in the city center and the transmission power in the countryside or the coast may be different. In general, there is a small transmit power in the city center, but may have a larger transmit power in the countryside.
  • a parameter value suitable for the divided region characteristics may be generated as the divided region parameter file. It is also possible to specify a separate parameter file for a specially designated area regardless of the divided area. At this time, for example, as described above, the specially designated area may be designated based on a plurality of factors. As an example, the specially designated zone may be designated by the wireless distributed communication system based on the contract. In this case, the distributed communication system may provide a special parameter for the contracted area through a contract parameter file.
  • the ecoland when the ecoland is set as a special region through the system (that is, when the ecoland has a contract with a distributed communication service provider), 200 broadcasting slots of broadcast channels may be exclusively used in all the ecoland regions. Such contracted local parameters may also be provided in one parameter file.
  • contract parameters of a contracted region may be broadcasted to a broadcast slot by a fixed distributed terminal in the region.
  • the mobile distributed terminal may receive a broadcast slot in advance in consideration of a service, and may receive a contract area and related parameters.
  • a parameter to be referred to may vary according to a location of a terminal.
  • the parameter may be set differently according to which service the terminal uses. Therefore, there is a need for creating a service parameter file separately. That is, it is necessary to generate other parameters according to the service as well as the location of the terminal. For example, even when the terminal is located on the coast, a short range chat service, a short distance call service, or a rescue request service may be required. At this time, each service may have a different communication parameter.
  • These service-specific parameters can be referenced when using the service.
  • the aforementioned service-specific parameters may be applied if they are higher than the priority of the currently set parameters. On the other hand, if the aforementioned service-specific parameters are lower than the priority of the currently set parameters, they may not be applied.
  • the services provided by the distributed modem may vary widely.
  • a very light and small distributed terminal such as a wearable device may mainly communicate with a distributed smartphone terminal.
  • the communication parameters applied to the wearable distributed terminal may be different from the general parameters. Therefore, in consideration of the above, existing parameters may be replaced based on a parameter file of high priority.
  • all parameter sets required for the distributed modem to operate may be an 'active parameter set'. More specifically, the active parameter set may be sequentially overwritten with the parameters of the low priority file from the parameters of the low priority file.
  • an active parameter set actually used from a plurality of files may be configured.
  • the active parameter set may receive a base value of a parameter from a base parameter file.
  • the basic parameter file may be different for each country or region and is not limited to the above-described embodiment.
  • location information and type information of the terminal can be confirmed.
  • parameters related to the current location of the divided region parameter file may be overwritten to the active parameter set.
  • parameters suitable for the location type for the identified location may be overwritten in the active parameter set.
  • a parameter related to the type of service executed by the terminal (or user) may be overwritten in the active parameter set. In this case, for example, the location information and the location type may be checked and overwritten.
  • the current location of the terminal is a contract area, it may overwrite the active parameter set with a contract parameter.
  • the active parameter set may exist only inside the distributed modem.
  • the active parameter set may exist outside the distributed modem. That is, the wireless distributed terminal may use a method of configuring an active parameter set outside the distributed modem and loading the active parameter set of the distributed modem as needed.
  • the distributed terminal has an active parameter set only in the distributed modem, so that the parameters in the distributed modem can be updated whenever necessary, and are not limited to the above-described embodiment.
  • the distributed terminal may store the distributed communication parameters in advance in order to receive a fast service as a smart device.
  • the communication parameter of the smart device may be determined by its terminal type, its location and the service to be used. For example, when the terminal type of the smart device is fixed and a service to be provided is not yet determined, the communication parameter of the smart device may be determined by the location of the smart device.
  • the distributed terminal can easily acquire its location through a mobile communication signal, wifi, GNSS, and the like. Therefore, in order to quickly prepare a service, the mobile terminal may determine a divided region to which the mobile terminal belongs, and store communication parameters of the divided region from a location attribute file in advance. That is, parameters may be loaded in the distributed modem, or loading values may be prepared in advance.
  • the parameters according to the service may be used in a manner that partially replaces the parameters related to the location. That is, when the user inputs the use of the service, the distributed terminal may immediately load a parameter value prepared in advance or reload a parameter related to the service among the preloaded parameters.
  • the communication parameters included in the embedded communication parameter file may include the type and number of wireless distributed communication channels, the center frequency of each channel, the bandwidth, the mapped contention channel frequency, reserved reserved slot information, and reserved fixed slot information. , At least one of priority setting slot information, super frame information, and slot group information.
  • the communication parameter may further include at least one of a modulation order, a basic transmission power, a maximum transmission power, encryption information, encryption and method, password and password method used in each service or slot.
  • the above-described parameters may be set as city, suburb, countryside, mountainous region, sea, beach, forest, river, etc. as parameter values for location characteristics.
  • the above-described parameters include basic language information and mobile communication service provider information allowed by the smart device, and are not limited to the above-described embodiment.
  • Parameters include channel information used for each service and the minimum and maximum number of service allocation slots for each service.
  • parameters for other information may be set, and the present invention is not limited to the above-described embodiment.
  • the above-described systems are not well supported one-to-one communication, and the main purpose is to provide information through broadcast.
  • the reason why the wireless distributed communication is not widely commercialized may be due to a communication resource collision problem and a hidden node problem.
  • the collision problem of the communication resource and the hidden node problem may be solved by the above-described and reference 1.
  • various types of terminals may appear in the future in a wireless distributed communication system. First, there is a terminal capable of moving a mobile communication terminal, a ship, a drone, a vehicle, and the like.
  • fixed terminals that is, fixed terminals, such as a shop, a department store, and an amusement park.
  • a terminal in the room such as home appliances, such as rice cookers, ovens, air conditioners.
  • IP Internet Protocol
  • a more efficient address method regardless of IP is needed.
  • a service-specific address may be required in a specific service area regardless of the terminal. Accordingly, in the following, a method for setting an address in consideration of a distributed terminal type may be provided to more efficiently provide a distributed communication service.
  • terminals of the wireless distributed system may set an address.
  • the terminal of the wireless distributed system may be at least one of a mobile communication terminal, a ship, a vehicle, a drone, and a fixed terminal.
  • the above-described terminal is only one example and is not limited to the above-described embodiment. That is, the terminal of the wireless distributed system may be a mobile terminal or various types as a fixed terminal.
  • addresses of terminals of the wireless distributed system may be set.
  • an address of a terminal of a wireless distributed system may be set based on characteristics of the terminal. In this case, when an address is set in consideration of characteristics of the corresponding terminal, the terminal may efficiently provide a service based on the address information.
  • the mobile terminal may inform whether the information of the terminal is reliable information by sending a unique number of the terminal. Also, as an example, the mobile terminal can inform whether the terminal is normally registered in the system.
  • the mobile terminal may provide a service through an existing communication network as a mobile communication terminal. For example, when the mobile terminal additionally includes a distributed communication modem, the service area may be widened, and the service may be efficiently provided.
  • the unique number of the terminal may be used as an address value in order to secure reliability in the wireless distributed communication system. That is, in the wireless distributed communication system, the mobile terminal can configure a public trust packet by using an address value of a unique number, thereby ensuring reliability in the wireless distributed system.
  • a fixed terminal may set an address using its latitude, longitude, and height values. That is, the fixed terminal may directly set the information related to the location as the physical information as the address value in consideration of being fixed.
  • the mobile terminal may calculate the location of the mobile terminal using the physical location information of the fixed terminal in consideration of the relationship with the fixed terminal.
  • the smart device may be equipped with a modem for an existing communication network and a distributed communication modem for the above-mentioned wireless distributed system as an integrated terminal. That is, the smart device may use existing mobile communication and wireless distributed communication at the same time.
  • the smart device may set the address of the wireless distributed communication differently for each service. That is, each service can be distinguished by assigning an individual address to each service.
  • each service in the smart device may be executed as a separate program. In this case, when each program is executed in the smart device, each address may be set for each program execution. That is, the address of the distributed terminal may be different each time the program is executed.
  • the address when each address value is set whenever the program is executed, the address may include a field for designating a terminal type or may use a different communication frequency according to the terminal type. That is, in configuring the address information, the terminal type may be considered in consideration of the above situation.
  • the terminal when a field specifying a terminal type is included in an address, the terminal may include other information in the above-described field different according to the terminal type of the terminal.
  • the type of terminal may be at least one of a smart device, a ship, a vehicle, and a home appliance.
  • the address information may include a field for a terminal type.
  • the first two bits in FIG. 13A may indicate that the service is an address generated by itself, and the remaining address fields may include address information generated by each service.
  • the address information is set by the system through the first four bits.
  • the remaining address fields may include address information set by the system.
  • the first four bits are an address set by a user who purchased the corresponding terminal having '1001'.
  • the remaining address fields may include address information set by the user.
  • 'subtype' may indicate a subtype of the mobile terminal.
  • '00' may indicate a mobile communication terminal
  • '01' indicates a vehicle terminal
  • '10' indicates a drone terminal
  • '11' indicates a ship terminal.
  • this is only one example and is not limited to the above-described embodiment. That is, it is indicated that the mobile terminal is indicated through the previous two bits, and the specific type of the mobile terminal can be indicated through the following two bits, which is not limited to the above-described embodiment.
  • the remaining address field may include longitude, latitude, and height information as physical location information about the fixed terminal, and is not limited to the above-described embodiment.
  • the distributed terminals may be distinguished by setting the addresses of the distributed terminals according to terminal characteristics. Through this, it is possible to efficiently provide service of the distributed terminal, which will be described.
  • the smart device may operate based on an existing mobile communication network and a distributed communication network.
  • the smart device may be set to the phone number as identification information based on the existing mobile communication network.
  • the phone number set in the smart device may be utilized in a wireless distributed communication system.
  • the 32-bit address shown in FIG. 13 (d) described above can be set to a value generated using the last eight digits excluding “010” in the mobile communication telephone number.
  • the number of each digit of the decimal number may be represented by 4 bits.
  • the terminal of the wireless distributed communication system sets the address of the terminal as the mobile communication telephone number, the terminal may associate the service provided in the distributed communication with the mobile communication service. For example, it may be considered to request a waiting number by accessing a distributed fixed terminal installed in a restaurant based on a wireless distributed communication system through a smart device.
  • a smart device may receive restaurant information through distributed communication.
  • the restaurant information may include current seat information and waiting number information, and is not limited to the above-described embodiment.
  • the smart device may know that there is no space and that the current waiting number is 4. Thereafter, the smart device may request the air number 5 through the fixed terminal using the wireless distributed communication system.
  • the distributed communication modem has set its address as the mobile communication phone number of the terminal, the stationary terminal of the shop can confirm the address and the telephone number of the terminal requested from the request at the same time. Accordingly, the stationary terminal of the store may transmit the waiting number table to the smart device and store the number table and the phone number to provide a service.
  • the fixed terminal of the restaurant may call a person corresponding to the waiting number sequence in a distributed communication when a seat is available in the restaurant. That is, as described above, when the smart device or the terminal supports the wireless distributed system and the existing mobile communication system, the address information is set in association with each other. As described above, the related information may be used.
  • the communication range of the wireless distributed communication system may be limited.
  • distributed communication may have a communication distance of about 300 meters.
  • the distance from the fixed terminal may be out of the range of the wireless distributed communication system. That is, even if the waiting number sequence of the smart device arrives, the smart device cannot be called by the distributed communication in the store.
  • the fixed terminal cannot receive the ACK for the call from the smart device as shown in FIG. 2B. Accordingly, when the fixed terminal does not receive the corresponding ACK, the fixed terminal may provide related information to the smart device through the mobile communication network. That is, even when operating based on a distributed communication system, in connection with an existing communication network, service providing efficiency may be improved.
  • the fixed terminal may inform the smart device that the ACK is not received by the distributed communication.
  • the fixed terminal may transmit information about a case in which the fixed terminal does not receive the ACK through the wireless distributed communication system to the shop owner's smart device.
  • the smart device of the shop owner is always included in the wireless distributed communication system in relation to the fixed terminal, so that the message transmission may not fail. That is, if the fixed terminal does not receive the ACK message from the smart device, the fixed terminal may transmit the related information to another preset smart device.
  • the distributed communication modem of the smart device owned by the shop owner may transfer the above information to the upper layer of the smart device. That is, the smart device may provide corresponding information to the running application.
  • the upper layer application may transmit related information to the corresponding smart device through the existing mobile communication network. That is, the upper application may send a call text to the mobile communication using the corresponding waiting number and the corresponding telephone number of the customer, or provide the above information through a messenger.
  • the smart device can transmit the message without limiting the distance, and can return to the restaurant based on this.
  • the terminal of the wireless distributed communication system sets the address of the distributed terminal modem through the existing communication network, the service can be efficiently received.
  • the smart device may add the phone number information of the smart device to a message transmitted to the fixed terminal and transmit the same.
  • the smart device may configure the address for distributed communication in another form and transmit the information to the fixed terminal by including the information of the smart device, and the present invention is not limited to the above-described embodiment.
  • the phone number of the above-described smart device may be personal information. In this case, when the distributed communication address information is configured as a phone number, problems in security and handling of personal information may occur, and thus may operate as described above.
  • the smart device may use another address assigned by the system. For example, referring to FIG. 13, the distributed communication address of the smart device may be changed according to a service characteristic.
  • a distributed terminal is a mobile terminal in a wireless distributed communication system
  • the following description is based on a vessel as a mobile terminal, but is not limited thereto.
  • the address of the terminal may be set to a maritime mobile service identity (MMSI) of the ship.
  • MMSI maritime mobile service identity
  • an address may be set based on the terminal type, as described above.
  • the user may move through the moving means.
  • the vehicle may be a ship or a vehicle.
  • the wireless distributed communication address value of the user's smart device can be set to double MMSI as a moving means.
  • the first four bits of the address field may be set to '0111'.
  • the smart device may periodically broadcast the ship's position information through the wireless distributed communication system. That is, the smart device may periodically broadcast the location information on behalf of the mobile means.
  • the broadcasted address information includes the ship's MMSI as described above, so that small ships can inform their location without the Automatic Identification System (AIS) system.
  • AIS Automatic Identification System
  • the smart device may periodically broadcast the ship's MMSI as described above, so that small ships can inform their location without the Automatic Identification System (AIS) system.
  • AIS Automatic Identification System
  • the first four bits of FIG. 13 may be set to '0111' in the terminal moving through the moving means (e.g. passenger ship, small vessel).
  • each means of movement may operate based on a wireless distributed communication system.
  • the mobile means may detect that the terminal is located in the mobile means through the wireless distributed communication system, and may provide a service based on the mobile means through the terminal.
  • the address information of the terminal may be set based on the above-described mobile means.
  • the first four bits may be set to '0111'. That is, the above-described address information that can indicate that the terminal located in the mobile means is a terminal located in the mobile means may be set.
  • ships or terminals may perform communication through a wireless distributed communication system.
  • the address value received in the distributed communication can be indicated as the terminal type moving through the moving means, it can be seen whether it is located in the moving means.
  • the other wireless distributed communication signals transmitted by the people in the ship in Figure 15 does not set the terminal type to the vessel in its address value, and because the MMSI is not set to the address, the vessel receiving this signal is It is clear that the information is irrelevant to the ship. For example, when domestic ships operate based on a wireless segmentation system, domestic ships and ships of other countries may be distinguished, and illegal operation may be cracked based on this.
  • an address of a terminal may be set based on a location of a fixed terminal in a wireless distributed communication system.
  • FIG. 13E may be an address of a fixed terminal.
  • the location information of the fixed terminal may be set to the address of the fixed terminal.
  • the terminal included in the wireless distributed communication system may measure its location based on address information received from the fixed terminal.
  • a plurality of fixed terminals may be located in a wireless distributed communication system. In this case, when the terminal of the wireless distributed communication system receives signals from the fixed terminal signals, the terminal may obtain the location information of the fixed terminal from the address information of the fixed terminal. Therefore, the terminal may calculate its position based on the position information of the fixed terminal.
  • the terminal may calculate its position through triangulation. Through this, the terminal in the wireless distributed communication system can check its own location information even without a location information receiving modem such as GPS. As another example, the terminal may calculate its location, the location of the fixed terminal and related information by using the received address, and transmit the above-described information to an upper layer of the terminal. That is, the above information can be transferred to another program of the terminal. Through this, the terminal may use the above-described location information and related information in the program.
  • FIG. 16 may be a case in which a terminal receives store information broadcast by another fixed distributed terminal and arranges the store information close to itself.
  • a plurality of restaurant shops may broadcast information about a restaurant through a wireless distributed communication system.
  • the information on the restaurant may be a shop name, menu information, and the like, and is not limited to the above-described embodiment.
  • the terminal in the wireless distributed communication system may check the location information of each fixed terminal based on the signal transmitted from the restaurants that are fixed terminals.
  • the terminal may calculate its own location using the location value of each shop, the delay time and the received power value of each signal from the signal transmitted from the fixed terminal.
  • the distributed modem of the terminal may transmit the above-described information to an upper layer of the terminal, and may use it for another program.
  • the terminal may inform the distributed terminals of the closest positions among fixed terminals (e.g. restaurants) located nearby based on the above information.
  • fixed terminals e.g. restaurants
  • the above-mentioned address information can be set only by using the back part of the dominant sect which expresses latitude and longitude.
  • a terminal having a plurality of communication modems may check the information on the front part of the Tobuncho based on another communication signal as at least one of a GPS signal, a mobile communication signal, or a wifi signal.
  • the exact location information can be confirmed through the address information of the fixed terminal, as described above.
  • the address information may include information about the height.
  • the height may be expressed at 1m intervals based on the sea level, and when using 10 bits, the height may be expressed up to 1023m.
  • the height may be a height measured based on the ground surface at the corresponding latitude and longitude locations.
  • the wireless distributed communication system may be self-addressed by the user or the system.
  • FIG. 13 (b) and FIG. 13 (c) may be cases where an address is set by a user or a system.
  • a case where a user purchases a terminal may be considered.
  • the terminal may be embedded with a unique number assigned by the terminal company.
  • the first 4 bits of the address may be '1000'.
  • the address of the terminal may be set by the user itself.
  • the first 4 bits of the address may be '1001' and the 8 bit terminal type field may be present behind the same.
  • the remaining address field of 24 bits may be set directly by the purchaser.
  • the user may intentionally manage terminals included in the same wireless distributed communication system.
  • the wireless distributed communication system is set in a house and the electronic devices included in the house are respective terminals
  • the user may set the address of the electronic device based on FIG. 13 (c) described above. That is, the first four bits of the address field are '1001', and four bits indicating that the terminal is set by the user and eight bits indicating the terminal type are set based on preset information, and the remaining 24 bits may be set by the user. have.
  • the 8-bit value may be set differently according to the type of the electronic device, and the remaining 24 bits may be set the same in the same wireless distributed communication system. That is, the electronic devices included in the home may have the same 24-bit value and are not limited to the above-described embodiment.
  • the distributed terminal modem of the smart device may request information in common for the home appliance having the same 24 digits as address information.
  • a wireless distributed communication system may include a rice cooker, a printer, a stove, a washing machine, a TV, an oven, and an air conditioner.
  • each may have a device type field value of h'01, h'02, h'03, h'04, h'05, h'06, and h'07. That is, the field indicating the terminal type may be set to the above-described value.
  • the 24-bit address value set by the user may be h′1a2b3c. That is, the distributed terminals in the house may be set to have the same 24-bit address value by the same user.
  • the distributed terminal modem of the smart device may request a report on the state of each electronic device in common based on the same address value as described above.
  • the distributed terminal modem of the smart device may simultaneously transmit information to the electronic devices based on the same address value.
  • the above-described example is described for convenience of description only and is not limited to the above-described embodiment.
  • the terminal may request status information for the terminal whose back address value 16 bits is h'2b3c.
  • there may be a plurality of devices of the same terminal type in a house.
  • a plurality of TVs may be present in a house.
  • some of the 24-bit address values may be set differently to distinguish the same terminal type.
  • some of the 24 bits may be set to the same address to simultaneously receive or transmit a request, which is not limited to the above-described embodiment.
  • the case where the terminal is a mobile terminal in a wireless distributed communication system may be considered.
  • a case where the terminal is a drone or a vehicle may be considered.
  • the drone or the vehicle may set its address value to a value generated by a unique number or a unique number.
  • the terminal performing identification or inspection of the drone or the vehicle may check whether the address value of the terminal is valid.
  • the address may be set to the vehicle terminal using the unique number of the vehicle in the wireless distributed communication system.
  • a vehicle license plate may exist in a vehicle, and the vehicle number may also be a unique number.
  • a unique number may be assigned to the vehicle itself. At this time, even if the owner or license plate of the vehicle is changed, the unique number of the vehicle can be maintained as it is, it is possible to continuously distinguish the vehicle.
  • the stolen vehicle may be identified through the wireless distributed communication system.
  • the vehicle is described based on a vehicle, but the same may be applied to a drone or another mobile terminal. That is, as the unique number is assigned to the mobile terminal and the unique number is set as address information, identification of the mobile terminal may be possible.
  • an address of a terminal may be set in a drone terminal using a unique number of a drone.
  • the drone unique number may be broadcast for safety.
  • the drone can broadcast information about the location and speed of the drone in a distributed communication to avoid collision between the drones.
  • the drone may transmit a broadcast packet using the unique number of the drone as the source address. For example, if all drones are assigned a unique number, it is possible to increase the management efficiency of illegal drones.
  • the specific terminal may receive an address value of another broadcasted terminal in real time.
  • the specific terminal may be confused with another terminal by broadcasting the received address value of the other terminal. In view of this, it may be impossible to monitor the stolen terminal. Therefore, if a specific terminal changes its address to another terminal address wirelessly received and transmits it, it may not be identified.
  • a vehicle may be considered as a terminal of a wireless distributed communication system.
  • the vehicle may consider a case in which failure information is transmitted through a wireless distributed communication system, and information about the received failure is received by a fixed distributed unit installed on a road and surrounding vehicles.
  • a broken vehicle encrypts and transmits its own accident information
  • nearby cars cannot receive the above information.
  • the other terminal or the vehicle cannot trust the information.
  • a public trust packet including a public trust field may be configured.
  • the number of bits of the 'public confidence field' may be determined by the system.
  • a method of generating a public trust field may be generated using a unique number assigned to a mobile distributed terminal such as a vehicle or a drone.
  • it may be generated based on the unique number and additional information of the distributed terminal. For example, information on a packet transmitting a unique number or information on a transmission time of a packet transmitting a unique number may be used to generate a public trust bit along with the unique number.
  • the unique number and other information may be used together to form a public trust bit, which is not limited to the above-described embodiment.
  • the public trust field may be generated by various existing encryption algorithms.
  • the public trust field may use both a symmetric key algorithm and an asymmetric key algorithm, and is not limited to the above-described embodiment.
  • the open trust check may be performed through open trust bits.
  • the public trust packet may include at least one of a header, information data, a public trust field, and a CRC.
  • the terminal may perform a CRC check and use the received information based on this.
  • the transmitting terminal when the transmitting terminal generates the public trust field using the identification ID of the receiving terminal, only the terminal having the corresponding identification ID among the terminals receiving the public trust packet may determine the packet reliability.
  • the transmitting terminal when the transmitting terminal generates the public trust field using the identification ID of the transmitting terminal, the reliability of the public trust field may be inspected only by a specific distributed terminal having the authority and function of the trust check.
  • the specific distributed terminal having the authority and function of the trust check may check its own reliability by using the unique number and public trust bits of the received information, and the trust check system using the unique number and public trust bits of the received information. May be sent to and received a result of its reliability.
  • a vehicle as a terminal of a wireless distributed communication system may transmit its accident information to distributed communication through a public trust packet.
  • the distributed road unit may receive the above-described information.
  • other terminals of the wireless distributed communication system may also receive the above-described information, which is not limited to the above-described embodiment.
  • the other terminal can transmit the received information including the unique number of the faulty vehicle and the information necessary for the trust check such as the reception time of the information to the trust check system.
  • the trust check system can then calculate the public trust bit using the unique number, the corresponding time of receipt, and the corresponding received information bits. Through this, the trust check system may determine the public information included in the public trust bits, thereby providing reliability.
  • the above-described reliability may be equally applied to other terminals as well as the vehicle, and is not limited to the above-described embodiment.
  • the above-described public trust bit may be used to monitor illegal transportation means (e.g. drones). At this time, whether or not the illegal means of transportation can first check the validity of the unique number with the unique number received as described above, and can verify the reliability of the information using the public trust bit. That is, if the checked number is not a registered unique number or if the checked public trust field does not match a trusted field value generated by the inspection system, the mobile means may be determined to be an illegal mobile means. .
  • the distributed terminal when the distributed terminal does not use its own address value as the unique number, the distributed terminal may additionally transmit its own unique number to check the public trust field. However, since this requires unnecessary resources, it may be necessary for a mobile terminal such as a vehicle or a drone to set its distributed communication address to a unique number.
  • a mobile terminal such as a vehicle or a drone to set its distributed communication address to a unique number.
  • a distributed ship communication such as AIS may use its own unique number of MMSI as its address value, and may operate in the same manner as described above.
  • many electronic and electrical products may be connected with integrated terminals such as smart devices.
  • a process of connecting an object with an integrated terminal such as a smart device may be complicated.
  • a wireless interface needs to be determined.
  • the smart device needs to search for an application for the thing and install the application.
  • the smart device may execute the application and wait for the application to recognize the bird and then control the object after the connection.
  • the application recognizes the thing
  • the user of the smart device needs to control the smart device.
  • the user of the device needs to perform an additional operation in consideration of the characteristics of the thing and the surrounding situation. Therefore, the users of the smart device may have many steps to perform, and the usage efficiency may be reduced.
  • the smart device may control the thing after being connected via WIFI or Bluetooth. That is, the user of the smart device needs to perform an operation of manually connecting WIFI or Bluetooth.
  • a method for automatically connecting a smart device to a service for providing a service may be required, and this will be described.
  • the terminal may directly communicate with the thing in various ways.
  • the terminal may perform direct communication using the existing WIFI or Bluetooth.
  • the terminal is competing based on the above-mentioned and reference 1 (Application No. 10-2017-0026778, Reception No. 1-1-2017-0207822-47, Collision Avoidance Method in Synchronous Wireless Communication System, Korea).
  • Distributed communication using a method can directly communicate with a thing.
  • the terminal and the thing have a common communication modem, and the terminal may search for the thing based on the common communication modem.
  • it is distributed based on the above-mentioned and reference 3 (application number 10-2018-0014682, application number 1-1-2018-0131792-95, service method using multiple channels in a synchronous TDMA system, Korea) You can search for things through communication.
  • the terminal may search for the thing through the slot and the channel based on the above.
  • the terminal may mean that the terminal prepares necessary preparation for receiving a service from the thing. That is, when the terminal communicates with the thing and installs a driver or program suitable for controlling the thing, the terminal may recognize the thing.
  • the terminal in order for the terminal to immediately recognize the object, it is necessary to directly receive a driver file, a program file, or a program installation file for controlling the object by the wireless device directly from the object.
  • things may not directly provide a driver or a program necessary for controlling themselves.
  • a large capacity semiconductor memory and a means for wireless communication may be required. That is, the existing objects do not have the above-described configurations, and thus, they cannot directly provide information about a driver or a program by wireless.
  • the above-described components may be included in the thing in consideration of the cost of the memory and the wireless communication modem.
  • the objects may include a modem for wireless communication and may embed information (e.g. driver file, program file, program installation file) necessary for object recognition.
  • information e.g. driver file, program file, program installation file
  • the terminal when the terminal requests the corresponding file to the thing through wireless communication, the thing may provide the corresponding file through wireless communication.
  • a terminal may access an object to which a service is to be provided.
  • the terminal may check information on the corresponding thing.
  • the information on the thing may be at least one or more of a product name, a type, and a model name, and is not limited to the above-described embodiment.
  • the terminal may recognize the information about the thing based on the information input from the user. In other words, the user needs to check the model name by accessing the object. Thereafter, the terminal may receive information about the object (e.g. driver file, program file, program installation file) through a communication network (e.g. internet app store, internet web page).
  • a communication network e.g. internet app store, internet web page
  • the user of the terminal may receive related information by searching an application or searching an installation file of a corresponding model. (S2014) After that, the terminal can download and install the application or the installation file. In this case, the terminal may check an object manipulation and a manual for recognizing the object and perform control on the object. That is, a plurality of procedures may be necessary as described above.
  • the terminal searches for the thing (S2021) and receives information about the thing (eg driver file, program file, program installation file). can do. That is, the object may embed a file for recognizing and controlling the object in a memory and provide the same to the terminal.
  • the terminal and the thing may include a common communication modem and a configuration for controlling the same.
  • the thing may also include a control device for providing the files stored therein.
  • the embedded files may be a driver file, a program file, or a program installation file for controlling the thing as a file for information on the thing as described above.
  • the driver file may provide a driver required by a basic program or an OS installed in the terminal.
  • the terminal may receive a service for the corresponding object from an existing program.
  • the terminal may receive a driver from an air conditioner.
  • the terminal may search for the surrounding objects (S2211), and may select the air conditioner therefrom.
  • the terminal may download and install a driver after selecting the air conditioner and may automatically recognize it. Thereafter, the terminal may control the air conditioner using the remote controller basic program and the corresponding driver.
  • the air conditioner has been described with reference to the air conditioner, but this is for convenience of description and is not limited to the above-described embodiment. That is, the same may be applied to other objects, and is not limited to the above-described embodiment.
  • the terminal may wirelessly download the program file or the program installation file from the corresponding object and install the program file.
  • a drone may be considered as a terminal.
  • the drone may embed a program for controlling the drone.
  • the terminal may directly download a program for controlling the drone wirelessly from the drone.
  • the terminal may search for a drone as a surrounding object.
  • the terminal may directly download the program from the corresponding drone and install it and automatically recognize it. Thereafter, the terminal may select and control the corresponding drone.
  • the terminal and the drone may include a common modem.
  • the general purpose control terminal can easily download the installation file from the corresponding drone to control the drone.
  • the terminal when the terminal automatically recognizes and controls an object, the terminal may first wirelessly search for neighboring objects. In this case, when the terminal searches for neighboring objects, the terminal may select a thing to be connected from among the found ones. The terminal may receive information on the thing (e.g. driver file, program file, program installation file) from the selected thing. In this case, as an example, the thing may broadcast information about the thing, and the terminal may recognize the thing by using the broadcasting information.
  • the thing e.g. driver file, program file, program installation file
  • a wake up tone channel can be used on the basis.
  • an object equipped with a battery may be efficiently operated at low power.
  • the above-described object may be awake based on a wake tone signal while maintaining a sleep mode.
  • the wake tone channel may mean a tone channel for awakening an object from among the tone channels as described above. That is, the case where the use of the tone channel is used as the awake of the thing can be considered.
  • the awakened object may broadcast its information on a preset wireless channel or check whether there is a packet delivered to the awakened object.
  • the terminal may recognize the thing by receiving the broadcast information.
  • the terminal may transmit a wake up tone.
  • the UE may transmit the wake tone to the object through the wake tone channel, and the object may be awake based on the wake tone channel.
  • the thing may broadcast information about the thing through a wireless channel.
  • the information on the thing may be the above-described information.
  • the terminal may receive the information about the broadcasted thing and acquire the thing information.
  • the terminal may set a source address as its own address and transmit a packet in which the address of the awakened object is set as a destination address.
  • the awakened object may transmit a response packet for the received packet to the search terminal when the destination address of the received packet matches its own address.
  • the response packet may include information about the thing, and the terminal may obtain the information about the thing.
  • the terminal may transmit a wake tone through the wake tone channel.
  • the terminal may transmit a packet having its own address as a source address and an address of the awakened terminal as a destination address.
  • the thing may receive a packet having itself as a destination address. Thereafter, the thing may transmit a response packet to the terminal to the terminal. Thereafter, the terminal may acquire information about the thing through the response packet, and may operate based on the above description. (S2325)
  • the terminal when the terminal searches for a thing based on the above description, the terminal may search for a plurality of things. In this case, in addition to the thing that the terminal wants to search, other things may wake up to broadcast their information for a predetermined time and perform an operation on whether there are no packets delivered to the user. Therefore, a thing that the terminal does not intend to control may consume the battery unnecessarily.
  • a desired tone slot pattern is used. Only things can be awakened.
  • the tone slot pattern may mean that information is transmitted to other sub-slots other than the 0 subslot of the contention channel, that is, the contention channel.
  • sub slot 0 is used for slot clearing.
  • the wake tone channel does not need to exclude the 0 subslot.
  • the tone slot pattern may be formed in all sub slots including sub slot 0 in the wake tone channel instead of the competing tone channel.
  • the tone slot pattern is a competitive tone channel described in Ref. 7 (Application No. 10-2018-0027675, Application No. 1-1-2018-0236883-25, How to Use Efficient Tone Channels in a Wireless Distributed Communication System, Korea). Or may be transmitted through a wake tone channel described in Ref.
  • tone channel 5 or a tone channel given meaning to slots and subslots described in Ref. 5 and is not limited to the above-described embodiment. That is, when transmitting a tone channel to automatically recognize a thing, only a specific thing may be recognized, and the present invention is not limited to the above-described embodiment.
  • the terminal may transmit the wake up tone and transmit a signal based on the tone slot pattern.
  • the wake up tone signal may be continuously transmitted during a frame of 1 second in length.
  • the wake tone signal may be transmitted in another form, and is not limited to the above-described embodiment.
  • the terminal may transmit the tone slot pattern after the wake tone signal is transmitted.
  • the object may further receive a tone slot pattern after receiving the wake tone signal.
  • the thing may be awake only when the tone slot pattern is a tone slot pattern associated with itself to broadcast information about the thing, or may receive a packet from the terminal.
  • the terminal may transmit the tone slot pattern associated with the air conditioner as an object after the wake up tone signal is transmitted.
  • the plurality of things may receive the wake tone transmitted by the terminal, only the air conditioner having the same tone slot pattern among the plurality of things may be awakened to communicate with the terminal. That is, the air conditioner may broadcast information of the air conditioner or receive a packet from the terminal.
  • the terminal may transmit a tone slot pattern related to an air conditioner after transmitting a wake tone signal. Afterwards, the air conditioner may check the tone slot pattern received after the wake up tone. In this case, when the tone slot pattern matches the pattern of the air conditioner, the air conditioner may be awake to check whether there is a packet that broadcasts or receives information of the air conditioner. For example, in the case of a TV as a peripheral object, it may operate as shown in FIG. 24C.
  • the terminal may transmit the tone slot pattern associated with the air conditioner after transmitting the wake tone signal. In this case, the TV may check the tone slot pattern received after the wake up tone. (S2422) Since the TV does not match its pattern and tone slot pattern, the TV may remain asleep. That is, the terminal may transmit a tone slot pattern for identifying the corresponding object after transmitting the wake tone signal. In this case, a plurality of things may exist around the terminal, and the terminal may identify a specific thing through a tone slot pattern.
  • the wake tone signal and the tone slot pattern may be used to awake and control the thing.
  • the terminal may need additional information through direct communication with the thing.
  • the terminal may not always provide a service through the thing, so it is necessary to indicate whether the service is active.
  • the user of the terminal may control the terminal to directly communicate with the thing.
  • the terminal may operate as described above based on the wake tone signal and the tone slot pattern.
  • the terminal may automatically select a thing to control from among a plurality of things.
  • the terminal may automatically select a thing based on a higher layer (program or application) setting.
  • a preset program may exist in the terminal, and an object may be automatically selected based on the preset program.
  • the program of the terminal may automatically select and control an object periodically.
  • the terminal may be configured to periodically execute a program. For example, in FIG. 25, if the feeding program automatically performs a feeding operation, this is only one example and is not limited to the above-described embodiment. Thereafter, the terminal may transmit the wake up tone through the wake up tone channel.
  • the program of the terminal may periodically change the corresponding object to an awake state by using the wake tone.
  • the tone slot pattern is transmitted based on the above-described period, and thus, the thing may be awakened in the above-described period. That is, the tone slot pattern may be set in consideration of the period, and the thing may be awakened based on a preset period through the tone slot pattern in which the period information is considered, and is not limited to the above-described embodiment.
  • the object that has received the wake tone signal may be awake to broadcast its own information or check whether its own packet exists. That is, the feeding machine and the surrounding objects may be awake to broadcast their information.
  • the terminal may receive the broadcasted thing information and then select the corresponding thing (or things). That is, the terminal may select a feeding machine after receiving the broadcasted object information. Thereafter, the terminal may control the thing (or objects) through direct communication. That is, the terminal may transmit a command for feeding the feeding machine to the feeding machine, and control the operation of the thing based on this.
  • the terminal may wirelessly download a file from an object and then perform a task required for recognition using the file.
  • a task required for recognition may mean installing a driver or program suitable for controlling a corresponding object in a terminal.
  • the terminal recognizes and controls the thing, it may be performed by using the downloaded and installed program, but it may be more efficient to download the driver than to download all the programs. That is, a general-purpose program is installed in the terminal, and the driver downloaded and installed therein can be applied to the program to perform control. For example, if a universal remote control program is installed in the terminal, the air conditioner driver can be downloaded from the air conditioner to operate the air conditioner, and the TV driver can be operated by downloading the TV driver from the TV.
  • authentication or password setting may be required in the object recognition process.
  • security and other problems may occur when a thing is controlled by another terminal that is not authenticated.
  • the terminal requests the thing to download a file embedded in the thing
  • the thing may request a password from the corresponding terminal.
  • the terminal includes a password in a packet controlling the thing and transmits it wirelessly, and the thing may allow control only when the thing is authenticated by checking the password in the packet. That is, the terminal and the thing may perform a procedure for authentication, and control authority of the thing may be given to the terminal only when authentication is completed. For example, all terminals may recognize the thing, but controlling the corresponding thing may be possible only by a specific terminal authenticated.
  • the password itself may be transmitted, but if the information transmitted using the password is scrambled with the PN code, the security may be further enhanced. Also, for example, it may be possible to change the form of security. Specifically, after the user purchases the thing, in case of setting the initial password, other security or authentication methods other than the password may be required.
  • whether to allow the control of the thing may be determined based on the reception power or the path loss of the signal received by the thing. More specifically, the thing may calculate the received power or path loss for the received signal. In this case, the thing may allow control of the thing only when the calculated received power is larger than the threshold value, or when the path loss is smaller than the threshold value. That is, the thing may allow control of a terminal that is at a certain distance or close to the thing by using a signal. For example, the range of the wireless distributed communication system may be set wider than the area where the terminal or the thing is located. However, the user or system of the terminal can determine the range of use by granting control authority only to signals up to a certain distance.
  • a user who purchases a TV as a user of an object may set a reception power threshold or a path loss threshold on the TV to prevent control by another person.
  • a thing may receive a control signal from a terminal.
  • the object may calculate a reception power or a path loss of the received control signal. If the received power is greater than the threshold or if the path loss is smaller than the threshold (S2613), the thing may determine that the terminal is close to the terminal and allow control. For example, when the reception power is smaller than the threshold or the path loss is larger than the threshold (S2613), the thing may not allow the control. (S2615)
  • the control of the thing may be performed based on the terminal ID.
  • the terminal ID may be registered in the thing. That is, if an ID of a terminal capable of controlling a thing is registered in the thing, the terminal may transmit a wireless packet including its ID to the thing. Through this, the thing may check whether the corresponding packet is an authenticated terminal through ID information of the received packet, and may allow control based on the ID.
  • a controllable terminal ID may be registered in a thing.
  • the thing receives the control signal (S2622)
  • the thing may determine whether an ID included in the control signal matches an ID registered with information. In this case, when an ID registered in the control signal is included, the thing may allow control.
  • the ID registered in the control signal does not include, the thing may not allow the control. (S2625)
  • an object may first receive a control signal. For example, when a user first purchases an object or is used for the first time after the object is reset, the object may receive a control signal for the first time.
  • the thing may automatically register the ID of the terminal included in the received control information as the control permission terminal registration ID. That is, it is possible to provide convenience for user use by recognizing and registering the first user.
  • the thing may determine whether the ID included in the control signal matches the ID registered information. In this case, when the ID registered in the control signal includes the thing, the thing may allow the control. On the other hand, when the ID registered in the control signal does not include, the thing may not allow the control. (S2636)
  • the terminal may perform additional control on the thing as well as the recognition of the thing. For example, the terminal may automatically execute a program related to the thing and automatically receive the current state of the thing and display the same on the interface screen of the program. Through this, it is possible to efficiently provide the state information and the service of the thing to the user of the terminal.
  • the terminal may recognize and control the object once recognized without having to download a file embedded in the object.
  • the terminal may request control of an already recognized object. That is, the user of the terminal may request control of an object already recognized through the terminal. Thereafter, the terminal can search for the surrounding objects by wireless.
  • the terminal may acquire a control right for the object and provide a service.
  • the terminal may provide service unavailable information to the user and terminate the service.
  • the method of searching for the object may use the same method as the method of searching for the object in order to recognize the object for the first time.
  • information (e.g. driver, program) embedded in a thing may be updated.
  • the update needs to be performed in connection with the terminal as well as the thing.
  • the terminal may receive a version information by requesting a version of the information (e.g. driver, program) from the thing. Thereafter, the terminal may determine whether to update the corresponding information by using the received version information.
  • the terminal may receive updated information about the thing by using an existing communication network or another communication network.
  • the terminal may transmit update information about the thing wirelessly received to the thing.
  • the thing may update the driver or program file received from the terminal and embed it.
  • the terminal may request version information from surrounding objects and receive the corresponding information.
  • the terminal may check whether the received version information is the latest information. In this case, if the received information is the latest information, the terminal may end the update procedure. On the other hand, if the received version information is not the latest information, the terminal may transmit a driver or program to the thing. For example, the terminal may receive the latest driver or program for the corresponding object from the device by another server, and transmit the same to the thing. Thereafter, the thing may update and embed the existing file by using the received driver or program. (S2814)
  • the terminal when the terminal wirelessly searches for a thing, the terminal may receive information from the thing based on a certain format. In this case, the terminal may determine the type of the thing based on the received information about the thing, and perform a recognition procedure for the thing. For example, the terminal may perform an initial search for the thing and may obtain the thing initial information based on the initial search.
  • the initial object information includes the name of the thing, the type of the thing, the model name of the thing, the product number of the thing, the types of the internal files, the available wireless communication information, the basic program type associated with the user terminal, the version, the current product state information, and the like. At least one or more of the supported language information may be included.
  • the types of embedded files refer to a driver or a program embedded in the thing
  • the usable wireless communication information may mean information on the communication means provided by the thing.
  • the thing may include one or more communication means, and available wireless communication information may be utilized.
  • the product number of the thing may be used.
  • the terminal may be automatically registered in the program in which the product number is installed.
  • files embedded in each thing may be produced in languages of each country.
  • the program menu may be displayed in the language of the corresponding country.
  • multiple languages will need to be supported.
  • as many drivers or program files as the number of supported languages may be embedded in the thing.
  • a driver or a program file may be created and embedded in a thing in common regardless of a language, and additional language-related files may be additionally embedded in a thing as many as the number of supported languages.
  • the terminal may also download a language-related file to support languages of each country. This allows the user to view the program in the desired language.
  • a method of recognizing a thing by a terminal may be provided based on the above description.
  • the terminal needs to access a thing that a terminal wants to receive a service (S2911), and check a product name, a type, and a modem name of the thing.
  • the terminal may be provided with a file about the thing through a communication network (e.g., an internet application store or a web page).
  • the terminal may search for the corresponding file through the communication network (S2914) and install the target file or application after downloading it.
  • the terminal checks an operation and a manual for recognizing the object (S2916), and accesses the object through authentication such as login.
  • the terminal registers the product number of the thing (S2918) and may perform an additional task for product setting. (S2919)
  • the terminal may operate based on FIG. 29 (b).
  • the terminal may search for nearby objects (S2921) and select a thing from the selected thing.
  • the terminal may automatically install a related file (S2923), and automatically recognize a thing and register a product number, as described above.
  • the terminal may perform an additional task for product setting, as described above. (S2925)
  • Reference 1 uses a collision contention scheme of a synchronous wireless distributed communication system.
  • the distributed communication system may be a TDMA system, it may use a slot.
  • the method of Reference 1 may mean using a slot as shown in Figure 30 (a), as described above.
  • the primary channel may be a broadcast channel, a slot used, and the like described in Reference 3 (application number 10-2018-0014682, a service method using multiple channels in a synchronous TDMA system) as a data channel through which data is transmitted. have.
  • the subchannel mainly refers to a tone channel and hereinafter referred to as a competition tone channel.
  • the contention may mean a TDMA slot allocation contention using a contention substitute channel based on the foregoing and reference 1, and the mapping of the data channel and the contention tone channel is as described above.
  • Reference 5 application number 10-2018-0021100, terminal operation method using a tone channel in a synchronous time division multiple access system
  • Reference 6 application number 10-2018-0021101, terminal in a wireless distributed communication system
  • Information can be simultaneously transmitted while performing slot clearing based on the operation control method of FIG.
  • the slot map may refer to a map in which each terminal creates a slot list that can be allocated among all slot resources.
  • the frame length may be set to 1 second and the slot length may be set to 2 ms. That is, 500 slots may exist in one second.
  • the slot may be divided into sub slots. In the following description, the description is based on the case where 40 sub slots exist in one slot, but the present invention is not limited thereto.
  • FIG. 30 (b) may have a frame structure based on the above description.
  • FIG. 31 is a diagram illustrating a method in which drones perform collision avoidance.
  • the drone may be a terminal or another device. That is, although FIG. 31 is described based on a drone for convenience of description, the same may be applied to other terminals or devices to which the wireless distributed communication system is applied. Therefore, in the following, the related content will be described collectively as a terminal, which may be a drone or another device of a wireless distributed communication system, and is not limited to the above-described embodiment.
  • each terminal may allocate its own registration ID, location, direction, and the like to the broadcast slot, and broadcast based on this. Therefore, each terminal can predict the collision in advance because it receives the position and direction of the other terminal.
  • the terminal A may allocate a use slot using a contention tone channel and transmit a path modification request packet to the B, C, and D terminals in the allocated use slot.
  • FIG. 32A may be the above-described packet.
  • the packet header may be 0x02 and may indicate a multipath modification request of designated terminals.
  • the source address may mean a 32-bit unique ID of UE A.
  • the destination address may mean a terminal unique ID of terminals B, C, and D, respectively.
  • the data may include modified path information of the B, C, and D terminal.
  • FIG. 32 (b) may be a configuration for a packet when the terminals A, B, C, and D are bundled with one group ID. For example, in the above-described case, only one destination address may be needed.
  • the B, C, D terminal receiving the one-to-many packet may transmit an ACK response to the terminal A.
  • one terminal may be allocated a slot resource for use for a one-to-many communication using a contention substitute channel. Thereafter, the terminal transmits a one-to-many communication packet by using the allocated used slot resource (S3320). Through this, other terminals may receive a one-to-many packet.
  • each terminal that receives a one-to-many packet as other terminals may transmit an ACK response to the aforementioned packet.
  • the one-to-many packet transmitting terminal may receive a packet ACK response from each terminal.
  • other terminals receiving the communication packet may perform a response based on the one-to-many method.
  • other terminals in FIG. 31 may be B, C, or D terminals.
  • each terminal may allocate a usage slot through contention, and transmit an ACK response to one terminal (A drone in FIG. 31) in the allocated usage slot.
  • a drone A drone in FIG. 31
  • each terminal may include the ACK response for the aforementioned use slot in the broadcast slot occupied by the terminal.
  • some terminals may not periodically broadcast their information, and thus may be applied to a terminal that is allocated a broadcast slot and performs periodic transmission.
  • UE A may transmit one-to-many packets in use slot 3 of frame five.
  • UEs B, C, and D may transmit ACK for the aforementioned packet in broadcast slots 20, 30, and 40 of frame 5, respectively.
  • this is only one example and is not limited to the above-described embodiment.
  • FIG. 34 (a) may transmit one-to-many packets in use slot 3 of frame five.
  • UEs B, C, and D may transmit ACK for the aforementioned packet in broadcast slots 20, 30, and 40 of frame 5, respectively.
  • a broadcast slot may exist in a broadcast channel and a use slot exists in a use channel, but in a mixed channel, a broadcast slot and a use slot may exist in the same channel.
  • an existing slot resource may be utilized without allocating an additional slot resource.
  • a plurality of ACK responses may be transmitted at once instead of one in the broadcast slot.
  • FIG. 34B a plurality of ACKs may be simultaneously transmitted.
  • the terminal A may consider the case of allocating three slots of slots 3, 6, and 9.
  • this is only one example and is not limited to the above-described embodiment.
  • FIG. 10 is only one example and is not limited to the above-described embodiment.
  • the broadcast slot number of UE B may be 20, and the ACK response may include 3, 6, and 9 slots.
  • the broadcast slot number of the C terminal may be 40, and the ACK response may include 3, 6, and 9 slots.
  • the broadcast slot number of UE D may be 50, and the ACK response may include 3, 6, and 9 slots.
  • the above-described method is only one example and is not limited to the above-described embodiment.
  • an ACK response may be transmitted through a method of transmitting information together with a slot clearing signal in a contention tone channel. That is, each terminal receiving the one-to-many packet may transmit a tone signal in a subslot of contention tone slot resource mapped to a used slot resource allocated and continuously used by the one-to-many packet transmitting terminal.
  • the tone signal may include the ACK response to the one-to-many packet described above.
  • an ACK response when one use slot is allocated for one-to-many communication, an ACK response may be transmitted as a tone signal.
  • an ACK response when a plurality of used slots are allocated for one-to-many communication, an ACK response may be transmitted as a tone signal.
  • an allocation slot group is allocated for one-to-many communication based on Reference 2
  • an ACK response may be transmitted as a tone signal.
  • an ACK response when one use slot is allocated for one-to-many communication, an ACK response may be transmitted as a tone signal from a pre-assigned subslot number.
  • the above description may be mainly used when the destination address is a group ID.
  • a NACK response may be transmitted as a tone signal.
  • the operation may be performed based on the above description in an environment in which there is almost no information transmission error and thus no need to send an ACK. That is, when there is no special error, the NACK signal may be transmitted when an error occurs as a negative response without transmitting a separate ACK.
  • a NACK response may be transmitted as a tone signal.
  • terminal A may transmit a one-to-many packet in use slot # 3 of frame # 5.
  • the UE may transmit an ACK in the sixth frame two tone slots.
  • UEs B, C, and D may transmit ACKs in subslots 2, 3, and 4, respectively.
  • the ACK may be transmitted in order in which the destination address is included in the one-to-many packet, but is not limited thereto.
  • FIG. 35B may be a case in which UE A allocates three slots of No. 3, No. 6, and 9 for one-to-many communication.
  • the terminal A may transmit a one-to-many communication packet in the third use slot of the fifth frame.
  • UEs may transmit ACK in tone slot 5 of frame 5.
  • the terminal B, C, D transmits the ACK in the sub slots 2, 3, 4 may be as shown in Figure 35a.
  • the response to the one-to-many packet transmitted in the sixth slot of the fifth frame may be transmitted in the eighth tone slot of the fifth frame.
  • the response to the one-to-many packet transmitted in the 9th slot of the 5th frame may be transmitted in the 2nd tone slot of the 6th frame.
  • FIG. 35C may be a case in which the terminal A allocates a slot group for one-to-many communication.
  • the slot group consists of multiples of 50. That is, three, 53, 103, 153,... A total of 10 slots of 453 times may be one slot group.
  • the terminal A may transmit a one-to-many communication packet in use slot 3 of frame 5.
  • UEs may transmit ACK in tone slot 52 of frame 5.
  • terminals B, C, and D transmit ACKs in subslots 2, 3, and 4, respectively.
  • the response to the one-to-many packet transmitted in the 53th slot of the fifth frame may be transmitted in the 102th slot of the fifth frame.
  • this is only one example and is not limited to the above-described embodiment.
  • terminal A may transmit a one-to-many packet in use slot # 3 of frame # 5.
  • the UE may transmit an ACK in the sixth frame two tone slots.
  • UEs B, C, and D may transmit ACKs in subslots 5, 8, and 13, respectively.
  • the subslot number for transmitting the ACK by each terminal terminal may be previously designated or dynamically assigned, and is not limited to the above-described embodiment. That is, the response subslot may be preset in each terminal.
  • the packet when the terminal transmits a one-to-many communication packet, the packet may include information on a subslot number to which each terminal responds. That is, the terminals receiving the one-to-many communication packet may perform a response based on the subslot numbers included in the packet.
  • FIG. 35E illustrates that UE A transmits one-to-many packets in use slot # 3 of frame # 5.
  • UEs may transmit NACK in subslot 2 of the tone slot 2 of frame 6.
  • NACK may be transmitted only when a reception error occurs.
  • terminals B and C may transmit NACK. At this time, even if both terminals transmit a NACK tone signal at the same time, the terminal A can know that the NACK exists.
  • the subslot number for transmitting the NACK by each terminal may be previously designated or dynamically designated.
  • a plurality of terminals may be assigned the same subslot number for NACK transmission. For example, when one-to-many file transfer is performed, if one terminal does not receive a packet, the entire packet needs to be retransmitted. However, since the one-to-one packet transmitting terminal does not know which terminal has sent a NACK, when the NACK is received, retransmission is necessarily performed. Therefore, in the case of using the method of FIG. 6E, for efficient one-to-many communication, each one-to-many packet receiving terminal measures one-to-many packet reception error rate by itself and automatically withdraws from one-to-many communication when a high error rate is measured. Multi can guarantee the efficiency of communication.
  • UE A may transmit one-to-many packets in use slots 3, 6, and 9 of frame # 5.
  • terminals 2, 3, and 4 of the tone slot 2 of frame 6 may transmit NACKs for slots 3, 6, and 9 of the frame 5.
  • the terminal A can know that the NACK exists.
  • the case where a plurality of terminals are allocated the same subslot number for NACK transmission may be considered.
  • the sub-slot number may mean a NACK for one-to-many packets transmitted in the slots 3, 6, and 9.
  • This NACK response method may be efficient when occasional NACK is received in an environment in which packet reception error rarely occurs.
  • the UE may efficiently transmit NACK while receiving several packets without having to send a NACK every time an error occurs in every packet.
  • a terminal transmitting an ACK or NACK response in FIGS. 35a, 35b, 35c, 35d, 35e, and 35f may transmit a tone in subslot 0 to perform group slot clearing.
  • a hidden node problem in one-to-many communication may be considered.
  • all terminals related to one-to-many communication may transmit slot clearing tones in tone slots mapped to use slots in which one-to-many communication is performed. Through this, a slot to which the entire one-to-many communication group is allocated can be used without collision, and in the following, this can be referred to as 'group slot clearing'.
  • a collision may occur in the used slot resource allocated for one-to-many communication.
  • the configuration of terminals participating in one-to-many communication may be continuously changed according to a communication environment. That is, any one of the slots currently allocated for one-to-many communication may be a slot in which collision occurs in the position of a terminal newly participating in one-to-many communication.
  • a collision of slot resources may occur by the corresponding terminal.
  • a case in which terminals A, B, C, and D allocate slots 3, 6, and 9 to communicate may be considered.
  • this is only one example and is not limited to the above-described embodiment.
  • a case where the terminal E using the use slot 3 near the terminal C approaches may be considered.
  • resource collision may occur in use slot # 3. Accordingly, in order to solve the problem of resource collision, there is a need to provide information about the collision to the terminal A transmitting one-to-many communication packet.
  • a method of checking a collision may be to check whether there is a tone received in another subslot in addition to the subslot used for the slot clearing and the ACK / NACK response. For example, when there is a tone received as a result of the test, it may be determined that the above-described collision has occurred.
  • the terminals may transmit a tone signal of a predetermined method for the purpose of checking for collision in a tone slot for performing slot clearing. For example, referring to FIG. 37A, a tone signal for collision avoidance may be transmitted together with a slot clearing signal in a plurality of subslots including the 0 subslot.
  • the above-described method may operate based on Reference 4, but is not limited thereto.
  • subslots for detecting collisions may be allocated in the middle, and the present invention is not limited to the above-described embodiment.
  • the entire group may transmit a tone signal for detecting a collision in the same subslot, which will be referred to as a "group tone" in the following.
  • a section for transmitting a group tone signal may be referred to as a 'group tone section.
  • each terminal of a one-to-many group may transmit a group tone in a group tone period.
  • a tone signal of a sub-slot not belonging to the group tone is detected in the group tone period, it may be regarded as a collision.
  • a case where a collision is allowed may be considered, and for details, reference may be made to Reference 3.
  • the corresponding terminal may inform the one-to-many packet transmission terminal of the collision to the slot number where the collision occurred.
  • the above and below have been referred to as a terminal for convenience of description, and the same may be applied to the terminal or another device. That is, the terminal is used only for convenience of description, and the terminal or other devices can be equally applied.
  • the corresponding terminal may allocate one use slot to perform one-to-one communication with a one-to-many packet transmission terminal (e.g. terminal A). That is, it can be informed whether or not the collision based on the above.
  • the terminal may broadcast information on the collision slot in the broadcast slot for broadcasting its information. Through this, one-to-many packet transmission terminal (e.g. terminal A) can check whether there is a collision and the collision slot.
  • UE A may receive slot information in which collision has occurred from UE C. Thereafter, the terminal A may perform a procedure required for one-to-many communication. At this time, it may be determined whether to allow the collision as described above. For example, a slot may be allocated to replace a collision slot. Alternatively, for example, the collision occurrence slot may be excluded from one-to-many communication, which may consider the reference 3 described above.
  • a collision of a usage slot may occur when UE A first allocates a usage slot for one-to-many communication. At this time, when a collision occurs in the slot resource from the start of communication, it may be difficult to perform smooth communication. In consideration of the above, when allocating a use slot for one-to-many communication, a use slot in which no collision occurs may be allocated.
  • slot map information broadcast by each terminal may be used to allocate a use slot in which collision does not occur.
  • each terminal transmits its information to the broadcast slot it may include its slot map information in the broadcast slot.
  • the terminal A may prepare a 'group valid slot map' that can be used by all group terminals based on the slot maps received from the respective terminals.
  • the terminal A may allocate the used slots belonging to the group valid slot map through the competition in the competition agency channel. Based on the above, the one-to-many packet transmitted by the terminal A may be transmitted to the terminals B, C, and D without resource collision.
  • the slot maps of the terminals A, B, C, and D may be '0110011100', '0110011110', '0010100100', and '0111011111', respectively.
  • the slot map is also only one example and is not limited to the above-described embodiment.
  • the group valid slot map may be derived by combining the above-described slot map, and the group valid slot map may be '0010000100'. That is, the terminal A can allocate the use slots 3 and 8, and perform one-to-many communication without collision.
  • the terminal A does not receive the ACK response to the one-to-many packet.
  • the following description is based on the terminal, but this is only for convenience of description and may be applied to other terminals or devices in the same manner, and is not limited to the above-described embodiment. For example, if a terminal that has transmitted a one-to-many packet does not receive an ACK response from all the terminals that receive the one-to-many packet, the terminal retransmits the one-to-many packet to all the terminals in a used slot allocated for one-to-many communication. can do. For example, referring to FIG.
  • the terminal A may retransmit one-to-many packets.
  • the terminal A may retransmit only to the terminal having no ACK response in the allocated use slot.
  • the terminal A may transmit a one-to-one packet through a use slot allocated only to the terminal D.
  • the case where the terminal C is too far from the terminal A may be considered.
  • the terminal C may move at or outside the boundary of the communication distance of the terminal A.
  • the terminal A may not continuously receive the ACK response to the one-to-many packet from the terminal C.
  • the method of excluding the terminal C from the one-to-many communication may be performed by deleting the ID of the terminal C from the destination address included in the one-to-many packet.
  • the terminal C when the destination address is a group ID, the terminal C may be excluded from the own group list. In addition, as an example, the terminal A may ignore the ACK response of the terminal C by itself, it is not limited to the above-described embodiment.
  • the terminal A calculates the ACK response rate from each terminal, and when the ACK response rate is less than or equal to a preset threshold, the terminal may be excluded from the one-to-many communication. Through this, unnecessary operation may be omitted for a terminal that does not receive an ACK response.
  • a dynamic group may be formed in the one-to-many communication described above.
  • a case where predetermined group terminals are designated may be considered.
  • a case in which group terminals are dynamically joined may be considered.
  • a case of performing one-to-many communication for collision avoidance between terminals may be considered.
  • the following description will be made based on the fact that UE A dynamically forms a group after allocating a used slot resource for one-to-many communication using a contention substitute channel, but is not limited thereto.
  • the following description will be made based on the terminal, but the same may be applied to the terminal or another device, and the present invention is not limited to the above-described embodiment.
  • the terminal A may induce a subscription without specifying a one-to-many communication group by itself. That is, a broadcast slot can be allocated using a contention substitute channel, and one-to-many communication group information can be broadcast in the assigned broadcast slot.
  • the one-to-many communication group broadcast information may include at least one or more of an assigned slot number, group join requirement, group slot clearing method, ACK response method, data encryption information, and sequence use information.
  • the one-to-many communication group broadcast information may further include other information related to one-to-many communication, and the present invention is not limited to the above-described embodiment.
  • the group joining requirement when a group is dynamically allocated, the group joining requirement may be set as a group joining requirement for a terminal located in a collision prediction area in a designated time domain.
  • the method for performing group slot clearing may refer to whether or not to perform clearing and the method described above.
  • any one of the above-described methods may be used as the ACK response method.
  • the data encryption and information may refer to information about the encryption and method applied to the one-to-many communication packet after joining the group.
  • whether or not to use a sequence may mean whether to assign a sequence to a packet from one-to-many communication start to end.
  • the terminal receiving the broadcasted one-to-many communication group information may determine whether to join the group by checking the aforementioned group joining requirement. For example, when the terminal determines to join the group based on the above-described information, a packet for requesting to join the one-to-many communication group may be transmitted to the one-to-many communication group information broadcasting terminal. In this case, the subscription request may be delivered to the terminal A using the broadcast slot occupied by the subscriber. In addition, as an example, the terminal may separately transmit a one-to-one packet by allocating a use slot through competition.
  • the terminal A receiving the one-to-many communication group join request may determine whether to accept the above-described request. For example, when the terminal A accepts the subscription request, the terminal A may join the terminal to the one-to-many communication group. In this case, the terminal A may not notify the subscribed terminal whether the separate subscription approval. Terminal A may transmit a one-to-many packet including the addresses of terminals subscribed to the destination address. In addition, as an example, the terminal A may first transmit a packet indicating whether to subscribe to the corresponding subscription terminal before transmitting the one-to-many packet.
  • the packet notifying whether the subscription is included may include at least one or more of the ACK response method, the ACK response subslot number, the subscription number, whether the group slot clearing is performed, whether data is encrypted, and whether the sequence is used together with the subscription approval information.
  • the packet indicating whether to subscribe may further include other information, and is not limited to the above-described embodiment.
  • the ACK response subslot number may be a subslot number used when performing an ACK response with a tone signal.
  • the subscription number may be a number assigned by the one-to-many communication management terminal to the subscribed terminal, which is not limited to the above-described embodiment.
  • FIG. 41 is a diagram illustrating a method for joining a dynamic group by a terminal based on the above description.
  • one terminal may be allocated a slot resource for one-to-many communication using a contention substitute channel.
  • one terminal may broadcast one-to-many communication group information by allocating a broadcast slot.
  • each terminal that receives the one-to-many communication group information may transmit a request for joining the communication group to the corresponding terminal.
  • the group information broadcast terminal receiving the group join request may join the above-described request application terminal to the one-to-many communication group and perform one-to-many communication.
  • a method of terminating one-to-many communication may be considered.
  • the terminal A may stop transmission of one-to-many communication packets. That is, the subject performing the broadcast may directly stop the broadcast.
  • the terminal A may transmit a one-to-many communication end packet to inform other terminals of communication end information of one-to-many communication.
  • the terminal A no longer broadcasts the one-to-many communication group information, thereby notifying that the one-to-many communication group is no longer valid.
  • the information that the one-to-many communication group ends is broadcasted once more. That is, through the above-described one-to-many communication can be more stably terminated.
  • slot resources for one-to-many communication may be pre-allocated.
  • the distributed communication system instead of one terminal allocating slot resource for one-to-many communication using a contention channel, it may be possible for the distributed communication system to allocate slot slot resource for one-to-many communication in advance.
  • the slot resource for such one-to-many communication is distributed by the distributed communication terminal described in Reference 6 (application number 10-2018-0021101, a method for controlling the operation of the terminal in a wireless distributed communication system) to periodically update. It can be allocated by including the use slot resource information in a communication parameter file in advance.
  • Reference 1 uses a collision contention scheme of a synchronous wireless distributed communication system.
  • the distributed communication system may be a TDMA system, it may use a slot.
  • the method of Reference 1 may mean using a slot as shown in Figure 42 (a), as described above.
  • the primary channel may be a broadcast channel, a slot used, and the like described in Reference 3 (application number 10-2018-0014682, a service method using multiple channels in a synchronous TDMA system) as a data channel through which data is transmitted. have.
  • the subchannel mainly refers to a tone channel and hereinafter referred to as a competition tone channel.
  • the contention may mean a TDMA slot allocation contention using a contention substitute channel based on the foregoing and reference 1, and the mapping of the data channel and the contention tone channel is as described above.
  • Reference 5 application number 10-2018-0021100, a method of operating a terminal using a tone channel in a synchronous time division multiple access system
  • Reference 5 information can be simultaneously transmitted while performing slot clearing. It may also operate based on the above-described bar.
  • the slot map may refer to a map in which each terminal creates a slot list that can be allocated among all slot resources.
  • the frame length may be set to 1 second and the slot length may be set to 2 ms. That is, 500 slots may exist in one second.
  • the slot may be divided into sub slots. In the following description, the description is based on the case where 40 sub slots exist in one slot, but the present invention is not limited thereto.
  • FIG. 42 (b) may have a frame structure based on the above description.
  • FIG. 43 is a diagram illustrating a method in which drones perform collision avoidance.
  • the drone may be a terminal or another device. That is, although FIG. 43 is described based on a drone for convenience of description, the same may be applied to other terminals or devices to which the wireless distributed communication system is applied. Therefore, in the following, the related content will be described collectively as a terminal, which may be a drone or another device of a wireless distributed communication system, and is not limited to the above-described embodiment.
  • terminals A, B, C, and D may perform many-to-many communication.
  • the terminals A, B, C, and D moving from the east, west, south, and north to the X point may be considered.
  • each terminal may allocate its own registration ID, location, direction, and the like to broadcast slots and broadcast them in the allocated broadcast slots.
  • the terminals can receive the location and direction of the other terminals, and can avoid the collision based on this.
  • the terminals may perform many-to-many communication.
  • the terminal may be the drone as described above. When the terminal is a drone, many-to-many communication may be performed for missing persons search, group flight, and the like, and the present invention is not limited to the above-described embodiment.
  • the terminal performing the many-to-many communication may mean a case where the subject performing the one-to-many communication is constantly changed. More specifically, the terminal A always sends one-to-many packets, and the drones B, C, and D do not respond to this, but any one of the terminals A, B, C, and D transmits one-to-many packets, and It may mean that other terminals respond. That is, in the many-to-many communication, the terminal for transmitting one-to-many packets may be continuously changed. In this case, as an example, the presence or absence of the response of the many-to-many communication may vary according to a situation, which will be described later.
  • Many-to-many communication may be performed based on one-to-many communication. That is, one-to-many communication may be regarded as a special case in which one terminal sends many-to-many packets in many-to-many communication, and is not limited to the above-described embodiment.
  • a slot resource for performing many-to-many communication in a synchronous wireless distributed communication system may be required.
  • the wireless distributed communication system may allocate predetermined slots as slot resources for many-to-many communication.
  • the above-described resource may be allocated to slot resources for many-to-many communication slots determined in advance based on reference 6 (application number 10-2018-0021101, a method for controlling the operation of a terminal in a wireless distributed communication system).
  • the distributed terminal described in Reference 6 may be specified from a communication parameter file embedded therein to perform an update.
  • the many-to-many communication slot resource may be allocated by a terminal performing many-to-many communication through a contention substitute channel having a different frequency.
  • all terminals of the many-to-many group must perform group slot clearing in allocated many-to-many slots. Thereafter, the terminals of the many-to-many group may transmit many-to-many packets in the allocated many-to-many slots.
  • each terminal of the many-to-many group must dynamically reassign one slot among the allocated many-to-many slots to its slot using a competing substitute channel having a different frequency.
  • the terminal dynamically reassigned a slot may transmit a many-to-many communication packet in the allocated slot. More specifically, referring to FIG. 44, slot resources for many-to-many communication may be allocated. Subsequently, one of the many-to-many slots allocated to the terminal of the many-to-many group may be allocated using a contention substitute channel having a different frequency (S4420). Then, using the allocated slot resource Many-to-many communication packets can be transmitted (S4430).
  • slots for many-to-many communication may be dynamically allocated.
  • the slot for many-to-many communication may be allocated to a slot in which resource collision does not occur.
  • each terminal may broadcast a slot map.
  • the slot may be allocated based on the slot map information broadcast by the terminal, thereby preventing collision.
  • the terminal when each terminal transmits its own information to the broadcast slot, the terminal may transmit its own slot map information in the broadcast slot.
  • the terminal A may create a 'group valid slot map' that can be used by all group terminals based on the slot maps received from the respective terminals.
  • slots belonging to the group valid slot map may be allocated through contention on the contention substitute channel.
  • the many-to-many packet transmitted by the terminal A may be transmitted to the other terminals, terminals B, C, and D, without resource collision.
  • a group valid slot map may be set.
  • the number of slots is set to 10 for convenience of description, but this is only one example and is not limited to the above-described embodiment. That is, it may be applied even when the number of slots is different.
  • the slot maps of the terminals A, B, C, and D may be '0110011100', '0110011110', '0010100100', and '0111011111', respectively.
  • the group valid slot map may be '0010000100'. That is, the terminal A may allocate slots 3 and 8 to allocate many-to-many communication resources without collision.
  • resources may be dynamically allocated.
  • group slot clearing may be performed.
  • slot clearing may be used to solve the hidden node problem.
  • all terminals related to many-to-many communication can transmit the slot clearing tone in the tone slot mapped to the slot in which the corresponding many-to-many communication is performed.
  • groups allocated to the entire many-to-many communication group can be used without collision.
  • group slot clearing may be performed.
  • the many-to-many slots may be three slots of Nos. 3, 53, and 453. In this case, the clearing may be performed in the tone slots in front of the allocated use slots, and thus resources may be used without collision.
  • FIG. 47 is a diagram illustrating a many-to-many packet.
  • the many-to-many packet of FIG. 47 may be similar to a one-to-many packet.
  • the one-to-many communication may be a special case of many-to-many communication, and the packets may be similarly configured.
  • Many-to-many communication may be performed through the aforementioned packet.
  • the packet header may be 0x02 and may indicate multipath modification requests of designated terminals.
  • the source address may mean a 32-bit unique ID of the terminal A.
  • the number of destination addresses may mean 3 as 0x3.
  • the destination address may mean a terminal unique ID of terminals B, C, and D, respectively.
  • the data may include modification path information of B, C, and D drones.
  • it may be a packet configuration when terminals A, B, C, and D are bundled with one group ID.
  • the destination address may need only many-to-many communication group IDs. That is, the destination address may be indicated only by the group ID.
  • the many-to-many communication group ID may be set in advance in the system.
  • the many-to-many communication group ID may be arbitrarily assigned by the terminal to which the many-to-many slots are allocated, and is not limited to the above-described embodiment.
  • each terminal may join a many-to-many communication group for many-to-many communication. In this case, a procedure in which each terminal joins may be necessary.
  • the terminal receiving the many-to-many communication packet may transmit a response to the packet.
  • a response may be required even when many-to-many packets are transmitted.
  • a response to a many-to-many packet may not be essential. In this case, in the above-described case, it may be efficient to manage the sequence, which will be described later.
  • conditional response may be performed for many-to-many communication used in vehicle communication.
  • drone A of FIG. 43 may send a packet of FIG. 47 (a) to drones B, C, and D to transmit a path correction request.
  • the drones B and C inform that they have modified the path, the drone D is unable to modify its path, and may consider the case of selecting a method to reduce the speed instead of the path correction. That is, each drone (or terminal) may transmit various types of response information in consideration of the above situation.
  • each terminal may include a response to a many-to-many packet in its own broadcast slot and transmit response information for the many-to-many packet.
  • drones B, C, and D may transmit response data for many-to-many packets sent from UE 3 in broadcast slots 20, 16, and 8, respectively.
  • this is only one example and may be transmitted through another slot. That is, corresponding information may be transmitted in its own broadcast slot, and is not limited to the above-described embodiment.
  • the operation based on the above-described bar cannot be performed.
  • a terminal of each many-to-many group may allocate one of the allocated many-to-many slots as a contention channel and transmit a response packet to the many-to-many communication packet in the assigned slot. .
  • the destination ID is set to one terminal of the many-to-many group
  • one-to-one packet can be transmitted in the many-to-many slot.
  • one-to-many packets may be transmitted in the many-to-many slot. That is, allocated many-to-many slots may be used to transmit one-to-many or one-to-one packets, as the case may be.
  • a response packet for a many-to-many communication packet may be transmitted through a general slot instead of a many-to-many slot.
  • a response may be transmitted in the assigned slot.
  • additional resources may be needed as well as resources used in many-to-many communication.
  • whether a response to a many-to-many packet may be determined based on a condition. For example, referring to FIG. 48, when the terminal D discovers the missing persons to the terminals A, B, and C, the terminal D may request to send the missing persons information to itself.
  • the above description is just one example, and is not limited to the above-described embodiment. That is, whether or not the response may be triggered and transmitted based on a predetermined condition.
  • the allocated many-to-many slots may be slots 3, 6, 9, and 12, but this is just one example and is not limited to the above-described embodiment.
  • the terminals A, B, and C may transmit a response only when a certain condition is satisfied (e.g., when the missing person finds himself).
  • the terminal C may transmit the response.
  • the terminal C may transmit a response by transmitting a one-to-one packet by using the 53th slot that does not belong to the many-to-many slot. That is, the terminal C may transmit a response through a one-to-one packet.
  • FIG. 50C illustrates that UE C may transmit a response through a one-to-one packet using a sixth use slot belonging to a many-to-many slot.
  • the counterpart terminal may transmit an ACK with respect to the response packet sent by the terminal C in FIGS. 50 (b) and 50 (c).
  • the terminal C may transmit a response packet again.
  • the terminal A sends a request for notifying the missing persons to the terminals B, C, and D
  • the terminal C may not receive the request.
  • the drone C may not transmit the missing person information to the drone A. Therefore, drones B, C, and D may need to send an ACK for many-to-many packets sent by drone A.
  • the ACK transmission as described above may be performed in various forms.
  • the terminal may be allocated slot resources through contention. Thereafter, the terminal may transmit a one-to-one packet including an ACK for the many-to-many packet in the allocated slot.
  • each terminal or drone may perform broadcasting by including an ACK response in the broadcasting slot occupied by itself. Through this, the ACK response can be transmitted.
  • the terminal may transmit ACK response information along with the slot clearing signal in the contention tone channel. That is, after receiving the many-to-many packet, the terminal may transmit a tone signal in a sub-slot of contention tone slot resource mapped to a slot resource allocated and continuously used by the many-to-many packet transmitting terminal.
  • the ACK response to the aforementioned many-to-many packet may be included in the tone signal and transmitted.
  • the ACK transmission method for the many-to-many packet may be the same as the ACK transmission method for the one-to-many packet.
  • the one-to-many communication may be a specific state of the many-to-many communication, and the many-to-many communication may be regarded as the subject of the one-to-many communication continuously changing, as described above. Can be.
  • the following describes a method of broadcasting many-to-many group information and a method of managing a sequence of many-to-many packets. At this time, it is possible to perform an efficient and stable many-to-many communication based on the above-described bar, and to secure the stability of the system based on this.
  • many-to-many group information may be broadcast.
  • the terminal allocating the many-to-many slots may allocate the broadcast slot using the competition agency channel, and broadcast the many-to-many communication group information in the allocated broadcast slot.
  • the terminals receiving the broadcast information may request to join the many-to-many communication group by themselves. For example, it may be performed as described above in a wireless group chat or an autonomous communication situation between the drones.
  • the many-to-many communication group information broadcasted in the allocated broadcast slot includes information on the purpose of the created group, group ID, group password setting information, channel and allocated slot information used in the many-to-many communication group, and transmission power of the present broadcast slot.
  • the withdrawal reception power value of this broadcasting slot the withdrawal reception slot error rate
  • the group clearing tone setting information the retransmission clearing subslot information
  • the subslot related information of the tone channel used for ACK / NACK transmission the sequence information of the many-to-many communication group , At least one of whether to continuously receive a broadcast slot on which group information is broadcast and group valid slot map information.
  • other information for a many-to-many communication group may be further included, and the present invention is not limited to the above-described embodiment.
  • the purpose of the created group may mean a service performed by the generated many-to-many group.
  • the group ID may be an ID assigned by the many-to-many communication group generating terminal by itself or previously assigned from the system.
  • the group password setting information may be whether or not a password is required to join the group.
  • the withdrawal reception power value of the broadcast slot may be the reception power value of the above-mentioned broadcast slot to which the subscribed terminal should leave.
  • the withdrawal reception error rate may be a reception error rate value of the above-mentioned broadcast slot to which the terminal should withdraw.
  • the group clearing tone setting information may mean whether group clearing is performed and a subslot position of the corresponding tone.
  • the retransmission clearing subslot information may mean whether the clearing used for retransmission is performed and the subslot position of the corresponding tone.
  • the information on the subslot of the tone channel used for ACK / NACK transmission may include at least one of whether the ACK requires many-to-many communication, whether the conditional ACK should be transmitted, and the subslot number information during the ACK transmission. It may mean.
  • the sequence information of the many-to-many communication group may mean whether the sequence is used in the many-to-many communication and the current sequence number when using the sequence.
  • whether to continuously receive a broadcast slot on which group information is broadcasted may mean whether a terminal subscribed to the corresponding many-to-many communication group should continuously receive the broadcast slot.
  • the group valid slot map information may be slots information that can be used by all the terminals subscribed to the group.
  • the terminal receiving the above-described broadcast slot may check a plurality of pieces of information for many-to-many communication. Thereafter, the terminal intending to join the corresponding many-to-many communication group may allocate a use slot using a contention substitute channel. The terminal may transmit a one-to-one packet requesting to join the many-to-many communication group to the many-to-many communication group information broadcast terminal by using the allocated use slot.
  • the many-to-many group generation terminal receives the above-described request to join the terminal to the group and transmit a packet when the subscription is completed. In addition, as an example, when the subscription of the terminal is denied, the many-to-many group generation terminal may transmit a packet indicating that the subscription is denied.
  • subscription rejection may occur based on a password mismatch or a type of terminal that cannot be subscribed to.
  • the subscription rejection may be set for other reasons or conditions, and is not limited to the above-described embodiment. This can happen for several reasons.
  • the terminal may allocate slot resources for many-to-many communication.
  • the many-to-many group management terminal allocates a broadcast slot to broadcast the many-to-many communication group information in the allocated broadcast slot.
  • the many-to-many communication group information is as described above.
  • the terminal receiving the many-to-many communication group broadcast information may transmit a one-to-one packet requesting to join the group by allocating a use slot.
  • the many-to-many communication group management terminal may join or disallow the terminal based on the above-described request, as described above.
  • a case in which a terminal (or a drone) operates based on a many-to-many communication group may be considered.
  • the terminal A (or the drone A) may receive a request including the slot map information of the terminal B from the terminal B (or drone B) wishing to subscribe to many-to-many communication.
  • the terminal A may be a many-to-many group management terminal.
  • the terminal A can determine whether the currently allocated many-to-many group slots can be used in the terminal B through the slot map information of the terminal B. For example, if there are many-to-many group slots that cannot be used in the terminal B, it is necessary to return the allocated slots and allocate other slot resources.
  • the terminal A may create a 'group valid slot map' indicating slots available for both terminals from the slot maps of the terminal A and the terminal B. Thereafter, the terminal A may allocate slots that the terminal A and the terminal B can use together using the group valid slot map information.
  • the terminal A is a management terminal of the above-described group, and can know the group valid slot map information of the terminal A and the terminal C in advance.
  • the terminal A may update the above-described group valid slot map to the group valid slot map available to all of the A, B, and C terminals. That is, the group valid slot map may be updated in consideration of the slot maps of all terminals included in the group.
  • the management terminal may examine and allocate slots without collision.
  • the terminals that have completed the subscription may perform group slot clearing to solve the hidden node problem.
  • it can simultaneously check for collisions of many-to-many communication slots in real time.
  • many-to-many slots allocated by avoiding collision at the time of subscription may also be collided during use.
  • the collision checking method may check whether there are tones received in other subslots other than the subslots transmitted by the many-to-many groups in the tone slots belonging to the many-to-many group. If there is a tone to be received as a result of the test, the terminal may recognize that a collision has occurred.
  • the terminals may transmit a tone signal of a preset method for the purpose of checking for collision in a tone slot for performing slot clearing.
  • a tone signal for collision avoidance may be transmitted along with a slot clearing signal in a plurality of subslots including the 0 subslot.
  • the method described above may be similar to Reference 5.
  • subslots for detecting collisions may be allocated in the middle.
  • the entire group may transmit a tone signal for detecting a collision in the same subslot.
  • the tone signal of the above-described purpose may be referred to as a "group tone.”
  • a section for transmitting a group tone signal may be referred to as a 'group tone section'.
  • each terminal of a one-to-many group may transmit a group tone in a group tone period.
  • a tone signal of a subslot not belonging to the group tone is detected in the group tone period, it may be regarded as a collision. That is, only the group tone signal may be transmitted in the group tone period.
  • it may be determined as a floor stone. In this case, for example, referring to Reference 3, it may be determined whether to allow a collision even when a collision is detected. That is, in certain cases, collision can be allowed to operate.
  • a collision may not be allowed in certain cases, and is not limited to the above-described embodiment.
  • the following description will be based on the case where a collision is not allowed for convenience of explanation. That is, it may be possible to operate while allowing a collision, but for the convenience of description, the following description will be based on the case where a collision is not allowed.
  • the terminal A may be a management terminal.
  • the terminal B may be a terminal joined to a many-to-many communication group.
  • the terminal B may transmit the slot number where the collision occurred to the many-to-many group management terminal A.
  • the terminal B may transmit its current slot map together.
  • unnecessary information may be continuously transmitted.
  • the many-to-many group management terminal A may exclude the corresponding slot for which the collision is reported from the many-to-many group slot resource, and also exclude the collision slot number from the many-to-many group slot resource broadcasted in the broadcast slot.
  • the many-to-many group management terminal A may allocate another slot as a many-to-many group slot instead of the excluded slot.
  • Terminal A may allocate a slot arbitrarily in the current group valid slot map through the competition agency channel.
  • the terminal A may repeat the procedure of allocating a slot.
  • a sequence may be given to a many-to-many packet.
  • ACK / NACK may be transmitted and received based on the above-described sequence of many-to-many packets.
  • the packet header may mean 0x04, which means transmission of many-to-many group information having a sequence.
  • the source address may mean a 32-bit unique ID of the A terminal.
  • the destination address may be 0x33, which means a many-to-many group ID.
  • the sequence number is 5 bits and may have a value of '00111'.
  • a many-to-many packet may be configured based on FIG. 53, and is not limited to the above-described embodiment.
  • other terminals receiving many-to-many packets may not transmit a response.
  • the error rate of many-to-many packets may be small.
  • an error may occur in many-to-many packets.
  • the sequence number consists of 5 bits and repeated from 0 to 31 in FIG. 54A may be considered.
  • the allocated many-to-many slots may be four slots 10, 20, 30, and 40.
  • the terminal C may not receive a signal transmitted by the terminal B in slot 20 of frame 5 in FIG. 54A. Therefore, the current many-to-many sequence number is 7 times for the terminals A, B, and D, but C, which has not received the packet 7, may have a current sequence number of 6. In this case, referring to FIG.
  • UE D may transmit a packet of sequence 8 in slot 30 of frame 5.
  • the terminal C may receive the sequence 8 times and recognize that the sequence 7 has not been received. Accordingly, the terminal C may transmit a many-to-many packet requesting retransmission of the sequence seven times in slot 40 of frame five.
  • the retransmission request packet may not include a sequence number.
  • the retransmission request may be set to a higher priority than sending a normal many-to-many packet.
  • 'retransmission clearing subslot' may be defined for retransmission.
  • the retransmission clearing subslot may mean giving priority to a terminal that requests retransmission or sends a retransmission packet.
  • the retransmission clearing subslot may be determined as 1 in FIG. 54C.
  • the sub slot 0 may be used for group clearing.
  • Terminal C may transmit the retransmission clearing tone signal in subslot 1.
  • one subslot can be selected at random from slots 2 to 39.
  • FIG. 54 will be described based on the case where 7 is selected for convenience of description. However, the present invention is not limited thereto.
  • Terminal A may select one subslot at random from subslots 2 to 39 in order to send a packet of sequence number 9. For example, the 6th slot may be selected. At this time, although the terminal A has selected a faster number, the terminal slot 1 cannot already win the contention, so the terminal C may transmit a packet requesting retransmission of the sequence seven times.
  • the terminals A, B, and D that have received the retransmission request may operate as follows.
  • the terminal B which has transmitted the seventh sequence, may allocate slot 10 of the sixth frame, which is the next many-to-many slot, using a contention substitute channel. In this case, the terminal B may retransmit sequence 7 using the allocated slot. At this time, the terminal A, B, D can determine whether or not it sent a seven times sequence, the terminal B can use the next many-to-many slot without performing a competition. However, as an example, when the terminal A does not receive the retransmission request, the terminal A may transmit the packet of sequence 9 in the next many-to-many slot.
  • the retransmission clearing subslot may be set. For example, referring to FIG. 54D, as shown in FIG. 54C, UE B may transmit a retransmission clearing tone signal in subslot 1 to prevent general A-to-many packet transmission of UE A and retransmit sequence 7.
  • all of the terminals A, B, and D that have received the seventh retransmission request may allocate the next many-to-many slot using a competitive proxy channel, and retransmit packet seven in the slot allocated by the terminal that successfully allocated.
  • UE D may retransmit packet 7 after winning a competition.
  • FIG. 54F it may be a case where subslot 1 is designated as a retransmission clearing subslot in FIG. 54E.
  • retransmission may be performed based on the packet structure of FIG. 12 (b). For example, when the packet header is 0x05 in FIG. 53 (b), this may mean retransmission of many-to-many group information having a sequence.
  • the terminal C may transmit the packet 7.
  • the above-described packet is only one example, and may be equally applied to a case where a packet is transmitted from another number.
  • the terminal C may transmit a packet, and the terminals A, B, and D may receive the above-described packet. In this case, the terminals A, B, and D may ignore this if the received packet 7 is the same retransmission packet as the existing packet 7.
  • terminals A, B, and D may receive packet # 7 repeatedly.
  • the terminals A, B, and D may allocate the next many-to-many slots using the contention substitute channel, and transmit a packet indicating that the current sequence number is seven times in the slot allocated by the terminal which successfully allocated.
  • UEs A, B, and D perform competition using retransmission clearing subslots, and transmit a packet indicating that UE D, which has been successfully allocated, indicates that the current sequence number is seven times.
  • the packet may be configured based on FIG. 53 (c) described above.
  • the packet header when the packet header is 0x06, it may mean 'current sequence number notification'.
  • the above-described packet may include a terminal address that transmits a packet that is out of sequence with a sequence number that is different from the current sequence number. Accordingly, the terminal C may recognize that the wrong packet is transmitted based on its terminal address by receiving the aforementioned packet. In this case, the terminal C may request retransmission for sequence 7 that it did not receive.
  • the packet indicating that the current sequence number is seven may be transmitted by the terminal B that originally transmitted the sequence 7 without performing competition, and is not limited to the above-described embodiment.
  • a method that can be used efficiently with sequences in many-to-many packets is to use an ACK tone signal or a NACK tone signal.
  • many to many packets may not always be transmitted in many-to-many slots. Therefore, there is a need to send ACK / NACK in consideration of the above-described situation. That is, when receiving many-to-many packets, ACK may be transmitted. On the other hand, when many-to-many packets are not received, NACK may be transmitted.
  • the retransmission clearing subslot number may be 3, the ACK transmission subslot number is 2, and the NACK transmission subslot number may be 1.
  • the terminal A may transmit a sequence 7-to-many packet in slot 10.
  • the terminal B receiving the packet of sequence 7 may transmit an ACK in subslot 2 of tone slot 19.
  • UEs C and D that have not received the packet of sequence 7 may transmit NACK in subslot 1 of tone slot 19. That is, each terminal may transmit a tone signal in the corresponding sub slot based on whether many-to-many packets are received.
  • the terminal A may transmit a retransmission clearing tone signal in subslot 3. Thereafter, the terminal A may perform contention from subslot 4 to 39 to allocate 20 used slots and retransmit the above-described sequence packet 7 in the corresponding slot. That is, terminal A may retransmit many-to-many packets.
  • the operation may be performed based on a NACK tone signal.
  • the retransmission clearing subslot number may be 2 and the NACK transmission subslot number may be 1.
  • the above-mentioned number is just one example, and it may be possible to use subslots of other numbers.
  • the case where the drone A transmits the many-to-many packet of the sequence seven times in slot 10 may be considered.
  • the terminal C and the terminal D may transmit a NACK in subslot 1 of tone slot 19.
  • the terminal that has not received the many-to-many packet may transmit a NACK in the corresponding subslot of the tone slot. Thereafter, the terminal A may transmit a retransmission clearing tone signal in subslot 2, perform contention in subslots 3 to 39, allocate 20 slots, and then retransmit the aforementioned sequence packet 7 above. .
  • a current slot number may be included in a broadcast slot through which many-to-many group information is transmitted.
  • the case in which the terminal A transmits a many-to-many packet of the seventh sequence in the tenth slot may be considered.
  • retransmission may be performed as described above.
  • the terminal C does not receive the many-to-many packet even in the slots 20, 30, and 40, the terminal C cannot continuously check that the terminal C has not received the seventh sequence.
  • the many-to-many group management terminal may be the terminal A described above.
  • the many-to-many group management terminal A may transmit a packet including the current sequence number in a broadcast slot through which the many-to-many group information is transmitted.
  • the terminal C can recognize that the terminal A has not received the seventh packet through the information broadcast by the terminal A.
  • the terminal C may request retransmission of the seventh packet.
  • the broadcast slot number may be zero. However, this is just one example and may be transmitted based on another number.
  • the case in which the terminal C transmits the packet of the sequence 8 in the slot 40 of the frame 5 in the above-described situation may be considered that the many-to-many group management drone A does not receive it.
  • the terminal A will broadcast that the current frame number is 7 in broadcast slot 0 of frame 6.
  • the terminal C receiving the above-described broadcast may transmit the packet of FIG. 53 (c) that the current sequence number is eight.
  • the terminal A receiving the above-described packet may transmit a packet requesting retransmission of the sequence 8 times, as shown in FIG. 57 (c).
  • the terminal C transmitting information indicating that the current sequence number is 8 in the slot 10 of the frame 6 may be a case in which the terminal C wins the competition for transmitting the above-described current sequence number.
  • a terminal in order to maintain a many-to-many group in a wireless distributed communication system, there is a need for a terminal to voluntarily or forcibly leave the group. For example, when a UE belonging to a many-to-many communication group leaves the many-to-many communication group, the withdrawal reception power value or withdrawal of the corresponding broadcast slot from the broadcast slot allocated by the many-to-many communication resource allocation terminal for the many-to-many communication group broadcasting The reception slot error rate can be transmitted. In this case, the terminal that satisfies the above conditions may leave the group autonomously.
  • each terminal of the many-to-many group receiving the many-to-many communication group information broadcast slot may calculate the reception power or the withdrawal reception slot error rate of the broadcast slot.
  • the terminal may voluntarily withdraw from the many-to-many communication group.
  • a withdrawal reception power value or a reception error rate may be transmitted in a many-to-many group information broadcast slot.
  • the terminal receiving the above-described information may extend the reception power or reception error rate of the corresponding broadcast slot.
  • the terminal when the reception power measured by each terminal is smaller than the withdrawal reception power, the terminal may perform withdrawal.
  • the error rate calculated by each terminal is greater than the withdrawal reception error rate, the terminal may perform withdrawal. That is, the terminal may continuously receive condition information for maintaining the group through broadcast, and may decide whether to withdraw according to whether or not the corresponding value is satisfied.
  • the terminal may allocate one slot among the above-mentioned many-to-many group slots using a competitive proxy channel, and inform the many-to-many group management terminal of its withdrawal from the allocated slot. have.
  • the management terminal may receive the withdrawal request and transmit an ACK response to the withdrawal request packet to the corresponding terminal.
  • the management terminal may transmit other many-to-many communication packets to transmit information about the withdrawal approval.
  • the terminal receiving the withdrawal request from among the group terminals may notify the many-to-many group instead.
  • the terminal receiving this may perform one-to-one communication with the withdrawal terminal and transmit a response to the withdrawal.
  • the received withdrawal request information must be broadcast in the broadcast slot. can do.
  • the terminal may perform the subscription procedure again as described above.
  • the terminal may withdraw itself from the group by suspending many-to-many communication. That is, the terminal may not receive many-to-many slots or may not perform any many-to-many communication related operations while receiving the same. More specifically, the terminal may not send a response packet, ACK / NACK and sequence error. That is, the terminal may not perform an operation related to the group. In this case, as an example, in the above-described case, the terminal can easily re-join the group which has withdrawn. That is, the terminal may receive the many-to-many slots again and resume performing the associated operation. However, a packet transmitted during the withdrawal cannot be requested by many-to-many group communication. In this case, when packet information transmitted while the terminal is withdrawn is needed, the terminal may receive one-to-one communication with one terminal among many-to-many group terminals.
  • the terminal may be forcibly withdrawn from the many-to-many communication. More specifically, the power or error rate of the many-to-many packet received by the many-to-many group management terminal can be measured for each terminal. In this case, when the terminal is smaller than the above-described power value or the predetermined threshold power value or the above-described error rate is larger than the predetermined threshold error rate, the management terminal may forcibly transmit information to withdraw from the group. That is, the management terminal may perform a withdrawal command. At this time, the corresponding terminal receiving the above-described information may be withdrawn from the many-to-many group, and may be forcibly withdrawn based on the above description.
  • 59 is a block diagram of a terminal device.
  • the terminal device 100 may include a transmitter 110 for transmitting a wireless signal, a receiver 120 for receiving a wireless signal, and a process 130 for controlling the transmitter 110 and the receiver 120.
  • the terminal 100 may perform communication with an external device through the transmitter 110 and the receiver 120.
  • the external device may be another terminal device, a base station, or another device capable of performing communication, and is not limited to the above-described embodiment.
  • the terminal selects a slot and performs an operation based on the processor 130.
  • the terminal selects a slot and performs an operation based on the processor 130.
  • the terminal device of the present invention described above is not limited to a smartphone as a mobile terminal.
  • the terminal device may be one of a drone, a vehicle, an IoT device, and other devices.
  • collision avoidance between drones may be performed based on the present invention.
  • collision avoidance between vehicles may be performed based on inter-vehicle communication based on the present invention.
  • a collision between a plurality of devices may be avoided as the home appliance, and the present disclosure is not limited to the above-described embodiment.
  • the present invention can be equally applied to other systems as well as the wireless distributed communication system, and is not limited to the above-described embodiment.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention concerne un procédé au moyen duquel des terminaux distribués réalisent des opérations commandées dans un système de communication distribué sans fil. Il n'y a pas de station de base pour commander les terminaux distribués dans le système distribué sans fil, et ainsi, chaque terminal distribué doit être commandé par un fichier de paramètres de communication inclus.
PCT/KR2019/002198 2018-02-22 2019-02-22 Procédé pour commander une opération d'un terminal dans un système de communication distribué sans fil Ceased WO2019164328A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2020544274A JP7330201B2 (ja) 2018-02-22 2019-02-22 無線分散通信システムにおける端末の動作制御方法
JP2023129206A JP2023162230A (ja) 2018-02-22 2023-08-08 無線分散通信システムにおける端末の動作制御方法
JP2025101222A JP2025131851A (ja) 2018-02-22 2025-06-17 無線分散通信システムにおける端末の動作制御方法

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KR1020180021102A KR20180058667A (ko) 2018-02-22 2018-02-22 무선 분산 통신 시스템에서 단말의 주소를 설정하고 이를 활용하는 방법
KR10-2018-0021102 2018-02-22
KR10-2018-0021101 2018-02-22
KR1020180021101A KR20180058666A (ko) 2018-02-22 2018-02-22 무선 분산 통신 시스템에서 단말의 동작 제어 방법
KR1020180035762A KR20180058669A (ko) 2018-03-28 2018-03-28 사물 자동 인식 및 제어 방법
KR10-2018-0035762 2018-03-28
KR1020180046372A KR20180058672A (ko) 2018-04-20 2018-04-20 무선 분산 통신 시스템에서 다대다 통신 방법
KR1020180046371A KR20180058671A (ko) 2018-04-20 2018-04-20 무선 분산 통신 시스템에서 ack 응답을 수행하는 일대다 통신 방법
KR10-2018-0046371 2018-04-20
KR10-2018-0046372 2018-04-20

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JP2022099864A (ja) * 2020-12-23 2022-07-05 沖電気工業株式会社 通信システム、ゲートウェイ、ゲートウェイプログラム、センサノード、及びセンサノードプログラム
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KR20230049967A (ko) 2021-10-07 2023-04-14 한국전자통신연구원 무선 분산 통신 시스템에서 신뢰 필드를 이용한 패킷의 무결성 검사 방법 및 장치
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JP7330201B2 (ja) 2023-08-21
KR20190101304A (ko) 2019-08-30

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