WO2017070842A1 - 一种设备到设备d2d通信方法、装置及系统 - Google Patents
一种设备到设备d2d通信方法、装置及系统 Download PDFInfo
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- WO2017070842A1 WO2017070842A1 PCT/CN2015/092947 CN2015092947W WO2017070842A1 WO 2017070842 A1 WO2017070842 A1 WO 2017070842A1 CN 2015092947 W CN2015092947 W CN 2015092947W WO 2017070842 A1 WO2017070842 A1 WO 2017070842A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/23—Manipulation of direct-mode connections
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a D2D communication method, apparatus, and system.
- D2D Device-to-Device Communication
- 3GPP 3rd Generation Partnership Project
- LTE Long Term Evolution
- D2D communication has the following advantages: 1) effectively improving data transmission rate and information interaction capability between UEs (User Equipment); 2) saving required radio resources and improving resource utilization; 3) effectively reducing data interaction between UEs Communication delay.
- D2D communication means that information exchange and wireless data transmission can be directly performed between UEs through a wireless communication link, and it is not necessary to implement forwarding between different UEs through a base station (Evolved Node B), like a traditional cellular network. Wireless communication.
- UEs outside the coverage of the LTE network they can also use the D2D communication technology to perform wireless communication with each other.
- FIG. 1A it can be seen from FIG. 1A that UE1 and UE2 within the network coverage can implement D2D communication.
- UE3 and UE4 outside the network coverage can also implement D2D communication.
- the D2D communication flow is shown in Figure 1B. Specific steps are as follows:
- Step 1 The UE 1 obtains a SL Grant (Dide), which is used to indicate the D2D communication resources available in the D2D communication resource pool available to the UE 1.
- the available D2D communication resource is valid for one SC. (Sidelink Control, link control) cycle;
- Step 2 In one SC period, the UE 1 uses the available SC resources in the D2D communication resource pool to send SCI (Sidelink Control Information);
- the SCI is used to indicate the time-frequency location of the D2D data resource allocated in step 1, so that the receiving end UE2 can determine the data resource location of the D2D data transmission by the UE 1 by decoding the received SCI.
- Step 3 In one SC period, the UE 2 receives and decodes the SCI, and determines the location of the D2D data resource that the UE 1 transmits the D2D communication data according to;
- Step 4 The UE 1 performs D2D communication by using D2D data resources, and transmits D2D communication data.
- Step 5 The UE 2 receives the D2D communication data sent by the UE 1 according to the location of the D2D data resource determined in step 3.
- the validity period of each allocated D2D communication resource is only one SC period, so in each SC period, the transmitting end must re-determine the D2D communication resources, and the receiving end must also re-determine the D2D communication resources. Therefore, D2D communication is less efficient.
- the embodiment of the invention provides a D2D communication method, device and system, which are used for solving the defects of low efficiency existing in the current D2D communication process.
- a communication method including:
- the base station determines the device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use, and the D2D SPS validity period refers to the Determining, by the first terminal, a duration of the D2D SPS resource, where the D2D SPS validity period is greater than one D2D link control SC period;
- the base station sends the D2D SPS resource information to the first terminal.
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period is used to indicate the first The time interval at which the terminal can reuse the D2D SPS resources.
- the base station before determining, by the base station, the D2D SPS resource information, the base station further includes:
- the base station determines the SPS period according to the D2D communication data generation period and the SC period.
- the base station sends the D2D SPS resource information to the first terminal, include:
- the base station sends the D2D SPS resource information before the first terminal ,Also includes:
- the base station receives a layer 2 identifier sent by a ProSe functional entity, and the layer 2 identifies a pair of D2D communication terminals used by the first terminal to perform one-to-one D2D communication with the second terminal;
- the base station forwards the layer 2 identifier to the first terminal and the second terminal.
- a communication method including:
- the first terminal determines the device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource, a D2D SPS validity period, and a D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use.
- the validity period refers to the duration of time that the first terminal can use the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- the first terminal sends information to the second terminal on the D2D SPS resource during the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period;
- the first terminal determines the semi-statically scheduled SPS resource information of the device to the device D2D, including:
- the first terminal determines, according to the SPS indicator, that the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period refers to the first terminal The time interval at which the D2D SPS resource can be reused;
- the first terminal sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS, including:
- the first terminal sends information to the second terminal on the D2D SPS resource by using the SPS period during the validity period of the D2D SPS.
- the SPS period is related to a D2D communication data generation period and an SC period.
- the first terminal is on the D2D SPS resource during the D2D SPS validity period. Before sending information to the second terminal, it also includes:
- the first terminal selects a layer 2 identifier from the preset at least one layer 2 identifier, and the dedicated layer 2 identifier is used to perform a pair between the first terminal and the second terminal.
- a pair of D2D communication terminals for D2D communication is used to perform a pair between the first terminal and the second terminal.
- the first terminal determines the D2D SPS resource information, including:
- the first terminal receives the D2D SPS resource information sent by the base station.
- the first terminal determines the D2D SPS resource information, including:
- the first terminal determines the D2D SPS resource information in a freely competitive manner.
- the method further includes:
- the first terminal starts a timer
- the first terminal is in the D2D SPS validity period before the timer expires
- the information is sent to the second terminal on the D2D SPS resource.
- the method further includes:
- the D2D SPS resource is released.
- the D2D SPS resource information includes an SC resource and a D2D SPS data resource, where the information Includes SCI and D2D communication data;
- the SCI includes a remaining time limit of the D2D SPS data resource SPS, where the remaining time limit of the SPS indicates a remaining valid time of the D2D SPS resource from a current SC period, and the remaining time limit of the SPS is greater than the one SC period;
- the first terminal sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS, including:
- the first terminal sends the SCI to the second terminal on the SC resource, and sends D2D communication data to the second terminal on the D2D SPS data resource, within the remaining time limit of the SPS.
- the SCI further includes an SCI indicator, where the SCI indicator is used to indicate
- the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period is that the first terminal can be reused Time interval of the D2D SPS resource;
- the first terminal sends the SCI to the second terminal on the SC resource, and sends the D2D communication data to the second terminal on the D2D SPS data resource, including:
- a communication method including:
- the second terminal decodes the device-to-device D2D link control information SCI sent by the first terminal, where the SCI includes the D2D semi-persistent scheduling SPS data resource and the SPS remaining time limit that can be used in the D2D communication resource pool that the first terminal can use.
- the remaining time limit of the SPS indicates the remaining valid time of the D2D SPS resource from the current SC period, and the remaining time limit of the SPS is greater than the one SC period;
- the second terminal receives the D2D communication data sent by the first terminal on the D2D SPS data resource within the remaining time limit of the SPS.
- the D2D SPS resource information further includes an SPS indicator, where the SCI indicator is used to indicate that the SCI includes the D2D SPS data resource and the SPS remaining time limit;
- the second terminal before receiving the D2D communication data sent by the first terminal, on the D2D SPS data resource, in the remaining time limit of the SPS, further includes:
- the second terminal determines, according to the SCI indicator, that the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period is that the first terminal can be reused Time interval of the D2D SPS resource;
- the second terminal receives the D2D communication data sent by the first terminal periodically on the D2D SPS data resource by using the SPS period in the remaining time limit of the SPS.
- the SPS period is related to a D2D communication data generation period and an SC period.
- the SCI carries the M bits identified by the layer 2, and the D2D communication data. Carrying N bits identified by layer 2, the layer 2 identifying a set of D2D communication groups for identifying one-to-one D2D communication between the first terminal and the second terminal, the M bits And the sum of the N bits is equal to all bits identified by the layer 2;
- the second terminal before receiving the D2D communication data sent by the first terminal, on the D2D SPS data resource, in the remaining time limit of the SPS, further includes:
- the second terminal determines that the M bits identified by the layer 2 are obtained from the SCI, and the layer 2 identifier obtained from the combination of the N bits identified by the layer 2 is the same as the stored layer 2 identifier.
- the second terminal is in the remaining time limit of the SPS, in the D2D SPS Before receiving the D2D communication data sent by the first terminal, the data resource further includes:
- the second terminal receives the layer 2 identifier sent by the base station, and the layer 2 identifies a pair of D2D communication terminals used by the first terminal to perform one-to-one D2D communication with the second terminal.
- the method further includes:
- the second terminal starts a timer
- the second terminal receives the D2D communication data sent by the first terminal on the D2D SPS resource within a remaining time limit of the SPS when the timer is not timed out.
- a base station including:
- a processing unit configured to determine device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource that can be used in a D2D communication resource pool that can be used by the first terminal, and a D2D SPS validity period, the D2D SPS The validity period refers to the duration of time that the first terminal can use the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- a sending unit configured to send the D2D SPS resource information to the first terminal.
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period is used to indicate the first The time interval at which the terminal can reuse the D2D SPS resources.
- the processing unit is further configured to: determine a D2D communication data generation period and an SC period of the first terminal; The D2D communication data generation period and the SC period are determined, and the SPS period is determined.
- the processing unit sends the D2D SPS resource information to the first terminal
- the processing unit sends the D2D SPS resource information to the first terminal
- the method further includes: a receiving unit, configured to receive the layer 2 identifier sent by the ProSe functional entity, where Layer 2 identifies a pair of D2D communication terminals for one-to-one D2D communication between the first terminal and the second terminal;
- the sending unit is further configured to forward the layer 2 identifier to the first terminal and the second terminal.
- a fifth aspect provides a first terminal, including:
- a processing unit configured to determine device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period that can be adopted in the D2D communication resource pool that can be used by the first terminal,
- the D2D SPS validity period refers to the duration of time that the first terminal can use the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- a sending unit configured to send information to the second terminal on the D2D SPS resource during the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period;
- the processing unit determines the semi-statically scheduled SPS resource information from the device to the device D2D, the processing unit specifically:
- Determining, according to the SPS indicator, the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period refers to the first terminal The time interval at which the D2D SPS resource can be reused;
- the sending unit sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS, specifically:
- the SPS period is used to send information to the second terminal on the D2D SPS resource.
- the SPS period is related to a D2D communication data generation period and an SC period.
- the sending unit is further configured to send a D2D communication request to the ProSe entity;
- a receiving unit configured to receive the layer 2 identifier sent by the ProSe entity by using a base station
- the processing unit is further configured to: select, as the layer 2 identifier, a layer 2 identifier from the preset at least one layer 2 identifier, where the dedicated layer 2 is used to identify the first terminal and the second terminal.
- a pair of D2D communication terminals that perform one-to-one D2D communication.
- the five possible implementation manners further include: a receiving unit, configured to receive the D2D SPS resource information sent by the base station.
- the processing unit determines the D2D SPS resource information, specifically:
- the D2D SPS resource information is determined in a freely competitive manner.
- the processing unit is further configured to start a timer
- the sending unit is further configured to: before the processing unit determines that the timer expires, send information to the second terminal on the D2D SPS resource during the D2D SPS validity period.
- the processing unit is further configured to: when determining that the timer expires, release the D2D SPS resource.
- the D2D SPS resource information includes an SC resource and a D2D SPS data resource, where the information Includes SCI and D2D communication data;
- the SCI includes a remaining time limit of the D2D SPS data resource SPS, where the remaining time limit of the SPS indicates a remaining valid time of the D2D SPS resource from a current SC period, and the remaining time limit of the SPS is greater than the one SC period;
- the sending unit sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS, specifically:
- the SCI further includes an SCI indicator, where the SCI indicator is used to indicate
- the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period is that the first terminal can be reused Time interval of the D2D SPS resource;
- the sending unit sends the SCI to the second terminal on the SC resource, and sends the D2D communication data to the second terminal on the D2D SPS data resource, in the remaining time limit of the SPS, specifically:
- a second terminal including:
- a processing unit configured to decode the device-to-device D2D link control information SCI sent by the first terminal, where the SCI includes a D2D semi-persistent scheduling SPS data resource, SPS, which can be used in the D2D communication resource pool that the first terminal can use.
- SCI includes a D2D semi-persistent scheduling SPS data resource, SPS, which can be used in the D2D communication resource pool that the first terminal can use.
- a remaining time limit where the remaining time limit of the SPS indicates a remaining valid time of the D2D SPS resource from a current SC period, where the remaining time limit of the SPS is greater than the one SC period;
- a receiving unit configured to receive D2D communication data sent by the first terminal on the D2D SPS data resource within a remaining time limit of the SPS.
- the D2D SPS resource information further includes an SPS indicator, where the SCI indicator is used to indicate that the SCI includes the D2D SPS data resource and the SPS remaining time limit;
- the processing unit is further configured to determine, according to the SCI indicator, that the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period is that the first terminal can be reused Time interval of the D2D SPS resource;
- the receiving unit when receiving the D2D communication data sent by the first terminal, on the D2D SPS data resource, in the remaining time limit of the SPS, specifically:
- the D2D communication data sent by the first terminal is periodically received on the D2D SPS data resource by using the SPS period in the remaining time limit of the SPS.
- the SPS period is related to the D2D communication data generation period and the SC period.
- the SCI carries the M bits identified by the layer 2, and the D2D communication data Carrying N bits identified by layer 2, the layer 2 identifying a set of D2D communication groups for identifying that the first terminal and the second terminal perform one-to-one D2D communication, the M bits and The sum of the N bits is equal to all bits identified by the layer 2;
- the processing unit is further configured to acquire, from the SCI, the M bits identified by the layer 2;
- the receiving unit is further configured to receive a media access control MAC data packet
- the processing unit is further configured to: acquire N bits identified by the layer 2 from the MAC data packet received by the receiving unit; and determine to acquire the M bits of the layer 2 identifier from the SCI.
- the layer 2 identifier obtained from the combination of the N bits identified by the layer 2 is the same as the stored layer 2 identifier.
- the receiving unit is further configured to receive a layer 2 identifier sent by the base station, Layer 2 identifies a pair of D2D communication terminals for one-to-one D2D communication between the first terminal and the second terminal.
- the processing unit is further configured to start a timer
- the receiving unit when receiving the D2D communication data sent by the first terminal on the D2D SPS data resource, within the remaining time limit of the SPS, specifically:
- a communication system comprising the base station according to the fourth aspect, or the first to fifth possible implementation manners of the fourth aspect, the fifth aspect, or the first aspect of the fifth aspect
- a D2D communication method in which the first terminal is The D2D SPS capable of using the D2D SPS resource has a validity period greater than one SC period.
- the first terminal only needs to determine the D2DSPS resource once, and the second terminal only needs to decode the SCI once to determine the D2D SPS resource, so that the first terminal does not It is necessary to determine the D2D SPS resources in each SC cycle, and the second terminal does not need to decode the SCI and determine the D2D SPS resources in each SC cycle, thus improving the D2D communication efficiency.
- FIG. 1A is a schematic diagram of a D2D communication scenario provided in the prior art
- 1B is a flow chart of D2D communication provided in the prior art
- FIG. 2 is a flowchart of communication according to an embodiment of the present invention.
- FIG. 3 is another communication flowchart according to an embodiment of the present invention.
- FIG. 4 is another communication flowchart of an embodiment of the present invention.
- FIG. 5A is a schematic diagram of a base station according to an embodiment of the present disclosure.
- FIG. 5B is another schematic diagram of a base station according to an embodiment of the present disclosure.
- FIG. 6 is a schematic diagram of a first terminal according to an embodiment of the present disclosure.
- FIG. 6B is another schematic diagram of a first terminal according to an embodiment of the present disclosure.
- FIG. 7A is a schematic diagram of a second terminal according to an embodiment of the present disclosure.
- FIG. 7B is another schematic diagram of a second terminal according to an embodiment of the present invention.
- D2D communication refers to direct information exchange and wireless data transmission between UEs through wireless communication links, without having to forward data and information through base stations in traditional cellular communication;
- D2D communication data refers to service data transmitted by the UE through D2D communication
- ProSe Function A network node on the core network side of the LTE system in the existing 3GPP protocol; used for authorization and parameter configuration for the UE in D2D communication. It is a network node, which may be a single device or a certain a functional module in the device;
- Network side refers to the LTE network and related network nodes.
- the network side mainly involves nodes such as a base station, an MME (Mobile Management Entity), and a ProSe Function.
- the wireless communication resources used by D2D communication and the corresponding resource allocation mechanism are one of the key factors affecting the performance of D2D.
- the base station configures several D2D communication resource pools dedicated to D2D communication to avoid its use in existing LTE networks. Cellular communication creates interference.
- the so-called “resource pool” refers to a set of time and frequency resources used for wireless communication.
- the "D2D communication resource pool” includes two resource pools, and the two resource pools have a sequence in time.
- the resources included in the previous resource pool are called “SC resources", and are used to transmit SCI related to resource scheduling allocation;
- the resources included in the latter resource pool are called "D2D data resources" and are used by the UE to transmit D2D communication data itself.
- Each D2D communication resource pool has a period called “D2D SC period", and the D2D communication resource pool is periodically repeated according to the corresponding D2D SC period.
- each UE will also be assigned a dedicated "layer 2 identifier" of length 24 bits for the addressing of D2D communication between UEs.
- the so-called D2D communication addressing means that the sender will "layer 2" above.
- the identifier is included in the transmitted SCI and D2D communication data; when receiving the data, the receiving end selectively receives the data sent by the specific UE with which D2D communication is performed according to the decoded "layer 2 identifier", avoiding erroneous reception and D2D communication data that is not related to itself.
- the transmitting end when transmitting the D2D communication data, the transmitting end includes the first 8 bits of the “layer 2 identifier” in the transmitted SCI, and the remaining 16 bits are included in the D2D data resource indicated by the SCI.
- MAC Medium Access Control
- the receiving end when receiving the D2D data, the receiving end first decodes the first 8 bits of the above "layer 2 identifier" from the SCI, and selectively decodes the remaining 16 bits from the MAC data packet header received on the indicated resource. .
- the receiving end determines that the corresponding D2D communication data is indeed from the transmitting end with which the D2D communication is performed, and receives it; otherwise, Not accepted.
- the base station allocates the “layer 2 identifier” through the network node “ProSe Function”, and sends the “layer 2 identifier” to the UE through the PC3 interface;
- the UE whose corresponding "layer 2 identity” will be pre-configured in the UE.
- a main application scenario of D2D communication is “one-to-one" D2D communication, as shown in FIG. 1A.
- the so-called “one-to-one” D2D communication refers to the matching and synchronization of two specific UEs before D2D communication, forming a "D2D communication pair", and then D2D communication based on unicast (Unicast) information transmission. the way.
- the transmitting UE transmits D2D communication data to a specific UE, and correspondingly, the receiving UE receives data transmitted from a specific UE.
- FIG. 1A a main application scenario of D2D communication is “one-to-one” D2D communication, as shown in FIG.
- the UE can perform matching and synchronization under network control through signaling interaction with the base station to form a D2D communication pair, and multiplex the frequency band of the LTE system for D2D.
- Communication for UE 3 and UE 4 outside the coverage of the LTE network, the A2D synchronization signal may be transmitted through each other, or some existing short-range wireless communication technologies (eg, Bluetooth, etc.) may be used for autonomous matching and synchronization.
- the D2D communication pair performs D2D communication without coverage on the spectrum pre-configured by the network operator.
- Base station The main function is to implement wireless communication of UEs in the LTE system and related control functions.
- the main function is to realize wireless data transmission and reception of mobile users (the present invention mainly refers to UEs performing D2D communication).
- Base station scheduler The main function is to perform coordination and radio resource allocation among multi-user UEs in the LTE system.
- Step 200 The base station determines D2D SPS (Semi-Persistent Scheduling) resource information, and the D2D SPS resource information includes D2D SPS resources, D2D SPS validity period, and D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use.
- the duration of the D2D SPS resource that the first terminal can use, and the validity period of the D2D SPS is greater than one SC period;
- Step 210 The base station sends the D2D SPS resource information to the first terminal.
- the D2D SPS resource that can be used by the first terminal may be a resource, or may be a resource group including at least two resources, which is not specifically limited herein.
- one resource includes a time domain resource and/or a frequency domain resource.
- the D2D SPS resource that the first terminal can adopt includes the first resource, and the first resource includes the subframe 1 and the frequency band 1.
- the subframe that the first terminal can adopt is the subframe 1, and the available frequency band.
- the third resource includes subframe 5 and frequency band 5.
- the subframes that the first terminal can adopt are subframe 1, subframe 3, and subframe 5, and the available frequency bands are frequency band 1, frequency band 2, and frequency band 5. .
- a resource includes both a time domain resource and a frequency domain resource.
- a resource may also include only a time domain resource or a frequency domain resource.
- the D2D SPS resources that the first terminal can adopt include a first resource, a second resource, a third resource, a fourth resource, a fifth resource, and a sixth resource, where the first resource includes the subframe 1, and the second resource includes the frequency band 1.
- the third resource includes the subframe 3
- the fourth resource includes the frequency band 2
- the fifth resource includes the subframe 5
- the sixth resource includes the frequency band 5.
- the subframe that the first terminal can adopt is the subframe 1.
- the available frequency bands are Band 1, Band 2, and Band 5.
- the D2D SPS validity period may also be an SC cycle as a basic unit, that is, the D2D SPS validity period may be X SC cycles, and X is greater than or equal to 1 Positive number.
- the D2D SPS validity period may be 10 SC cycles, or may be 20 SC cycles, or may be 30 SC cycles, etc., of course, other numbers of SC cycles may be used, and are not specifically limited herein. .
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period refers to a time interval at which the first terminal can reuse the D2D SPS resource.
- the SPS period takes the SC period as a basic unit, that is, the SPS period may be X SC periods, and X is a positive number greater than or equal to 1.
- the SPS period may be one SC period, or may be two SC periods, or may be three SC periods.
- other numbers of SC periods may be used, and are not specifically limited herein.
- the method further includes the following operations:
- the eNB sends an RRC (Radio Resource Control) message to the first terminal, where the RRC message carries the information of the D2D communication resource pool that the first terminal can use.
- RRC Radio Resource Control
- the foregoing RRC message may further carry the first indication information, where the first indication information is used to indicate that the first terminal uses the manner notified by the base station to obtain the D2D SPS resource that can be used by the first terminal, and does not need to be obtained through a freely competitive manner. .
- the second terminal also needs to determine the D2D communication resource pool. Therefore, the base station also sends the RRC message to the second terminal. After both the first terminal and the second terminal determine the D2D communication resource pool, the D2D communication resource pool is configured.
- the base station receives the D2D ProSe BSR (Buffer Status Report) sent by the first terminal, and the amount of data to be transmitted for reporting the D2D communication.
- D2D ProSe BSR Buffer Status Report
- the base station before the base station determines the D2D SPS resource information, the base station further includes the following operations:
- the base station determines the SPS period according to the D2D communication data generation period and the SC period.
- the SPS period is set to the least common multiple of the D2D communication data generation period and the SC period.
- the base station determines the D2D communication data generation period of the first terminal.
- the base station determines, according to the scheduling request sent by the first terminal, that the D2D communication data to be transmitted by the first terminal has periodic generation characteristics, needs periodic scheduling, and acquires a D2D communication data generation period.
- the base station can obtain the corresponding D2D communication data generation period by sensing the reporting frequency of the scheduling request of the first terminal and the data amount reported by the ProSe BSR.
- the base station can also determine the D2D communication data to be transmitted as the VoIP (Voice over Internet Protocol) voice by using the LCGID (Logical Channel Group Identity) included in the ProSe BSR sent by the first terminal.
- LCGID Logical Channel Group Identity
- a data type having periodic characteristics such as data or streaming media to acquire a D2D communication data generation period.
- the method may be as follows:
- the base station sends DCI (Downlink Control Information) to the first terminal, and the DCI carries the D2D SPS resource information.
- DCI Downlink Control Information
- the D2D SPS resource information includes DCI, and the DCI can be as shown in Table 1.
- the D2D SPS resource information includes the SPS indicator
- the D2D SPS resource information is carried in the DCI
- the first terminal receives the DCI, determining that the DCI is not the DCI of the prior art according to the SPS indicator, Is a DCI that includes D2D SPS resource information.
- the method before the base station sends the D2D SPS resource information to the first terminal, the method further includes the following operations:
- the base station receives the layer 2 identifier sent by the ProSe functional entity, and the layer 2 identifies a pair of D2D communication terminals used for the first terminal to perform one-to-one D2D communication with the second terminal;
- the base station forwards the layer 2 identifier to the first terminal and the second terminal.
- the first terminal and the second terminal must have an identifier that only the other party can recognize, and the identifier is to be allocated by the base station to the two terminals.
- the base station when the base station sends the layer 2 identifier to the first terminal and the second terminal, the base station may send the identifier through the PC3 interface.
- the base station starts a timer, and when the timer expires, the D2D SPS resource allocated for the first terminal is released.
- the foregoing process describes that the first terminal is within the coverage of the base station, and the D2D SPS resource is determined by the manner indicated by the base station, instead of being acquired through a freely competitive manner.
- the D2D SPS resource is not determined by the way indicated by the base station, but is obtained by a freely competitive manner.
- the base station does not send the D2D SPS resource information to the first terminal, but may
- the terminal sends an RRC message, where the RRC message carries information about the D2D communication resource pool that the first terminal can use.
- the foregoing RRC message may further carry the second indication information, where the second indication information is used to indicate that the first terminal can acquire the D2D SPS resource in a freely competitive manner, and the first terminal is not required to be used to obtain the first terminal. D2D SPS resources.
- the D2D SPS validity period of the first terminal capable of using the D2D SPS resource is greater than one SC period, the first terminal only needs to determine the D2DSPS resource once during the validity period of the D2D SPS, and the second terminal only needs to decode the SCI once to determine the D2D.
- the SPS resources in this way, the first terminal does not need to determine the D2D SPS resources in each SC cycle, and the second terminal does not need to decode the SCI and determine the D2D SPS resources in each SC cycle, thus improving the D2D communication efficiency.
- Step 300 The first terminal determines the D2D SPS resource information, where the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use, and the D2D SPS validity period refers to the first terminal can use the D2D.
- the duration of the SPS resource, the D2D SPS validity period is greater than one link control SC period;
- Step 310 The first terminal sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS.
- the D2D SPS resource that can be used by the first terminal may be a resource, or may be a resource group including at least two resources, which is not specifically limited herein.
- one resource includes a time domain resource and/or a frequency domain resource.
- the D2D SPS resource that the first terminal can adopt includes the first resource, and the first resource includes the subframe 1 and the frequency band 1.
- the subframe that the first terminal can adopt is the subframe 1, and the available frequency band.
- the third resource includes subframe 5 and frequency band 5, in which case the first terminal can adopt
- the subframes are subframe 1, subframe 3, and subframe 5.
- the available frequency bands are Band 1, Band 2, and Band 5.
- a resource includes both a time domain resource and a frequency domain resource.
- a resource may also include only a time domain resource or a frequency domain resource.
- the D2D SPS resources that the first terminal can adopt include a first resource, a second resource, a third resource, a fourth resource, a fifth resource, and a sixth resource, where the first resource includes the subframe 1, and the second resource includes the frequency band 1.
- the third resource includes the subframe 3
- the fourth resource includes the frequency band 2
- the fifth resource includes the subframe 5
- the sixth resource includes the frequency band 5.
- the subframe that the first terminal can adopt is the subframe 1.
- the available frequency bands are Band 1, Band 2, and Band 5.
- the first terminal determines the D2D communication resource pool.
- the first type is obtained through an RRC message, and the second type is obtained through a pre-configured manner.
- the first terminal when the first terminal acquires the D2D communication resource pool by using the RRC message sent by the base station, the first terminal may obtain the D2D SPS resource by using the base station indication, or may acquire the D2D SPS resource in a self-competitive manner. If the first terminal is obtained through a pre-configured manner, the first terminal can only be obtained through self-competition.
- the D2D SPS resource information in order for the first terminal to quickly determine that the D2D SPS resource information includes the D2D SPS resource and the D2D SPS validity period, the D2D SPS resource information further includes an SPS indicator, and the SPS indicator is used to indicate that the D2D SPS resource information includes the D2D SPS. Resources and D2D SPS validity period;
- the first terminal determines the device to device D2D SPS resource information
- the following manner may be adopted:
- the first terminal determines, according to the SPS indicator, that the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period.
- the D2D SPS resource information includes the following contents: the D2D SPS resource and the D2D SPS validity period. Further, the D2D SPS resource information is used to transmit information, so as to avoid transmitting information in an existing manner.
- the D2D SPS resource information further includes an SPS period, where the SPS period refers to a time interval at which the first terminal can reuse the D2D SPS resource.
- the first terminal sends the second terminal to the D2D SPS resource during the validity period of the D2D SPS.
- sending a message you can use the following methods:
- the first terminal sends information to the second terminal on the D2D SPS resource by using the SPS period during the validity period of the D2D SPS.
- the SPS period is related to the D2D communication data generation period and the SC period.
- the first terminal is paired with the second terminal before sending the information with the second terminal, so that the first terminal and the second terminal know that Which terminal is used for D2D communication.
- the matching between the first terminal and the second terminal may be implemented by the base station, or may be implemented by free competition. Therefore, before the first terminal sends the information to the second terminal on the D2D SPS resource within the validity period of the D2D SPS, Also includes the following operations:
- the first terminal sends a D2D communication request to the ProSe entity, and receives the layer 2 identifier sent by the ProSe entity through the base station; or
- the first terminal selects a layer 2 identifier from the preset at least one layer 2 identifier as the layer 2 identifier of the first terminal, and the dedicated layer 2 identifies a pair for the first terminal to perform one-to-one D2D communication with the second terminal. D2D communication terminal.
- the D2D communication request may be an OMA (Object Management Architecture) terminal management message.
- OMA Object Management Architecture
- the identity of the first terminal and the second terminal may also be obtained, and the identity of the first terminal may be an IMSI (International Mobile Subscriber Identity). Or the corresponding mobile communication telephone number, etc., the identity of the second terminal may be an IMSI or a corresponding mobile communication telephone number or the like.
- IMSI International Mobile Subscriber Identity
- the first terminal when receiving the layer 2 identifier sent by the ProSe entity by the base station, may optionally receive the layer 2 identifier sent by the ProSe entity through the base station through the PC3 interface.
- the first terminal when the first terminal determines the D2D SPS resource, it may be obtained by the base station, or may be obtained by using a freely competitive manner. Therefore, when the first terminal determines the D2D SPS resource information, the following manner may be adopted:
- the first terminal receives the D2D SPS resource information sent by the base station.
- the method when the first terminal receives the D2D SPS resource information sent by the base station, the method may be as follows:
- the first terminal receives the DCI sent by the base station, and the DCI includes D2D SPS resource information.
- the D2D SPS resource information is carried in the DCI.
- the first terminal obtains the D2D SPS resource by using the base station indication, the first terminal is within the coverage of the base station, in this case, the first terminal also receives the RRC message sent by the base station, in the RRC message. Carrying information of a D2D communication resource pool that the first terminal can use.
- the foregoing RRC message may further carry the first indication information, where the first indication information is used to indicate that the first terminal uses the manner notified by the base station to obtain the D2D SPS resource that can be used by the first terminal, and does not need to be obtained through a freely competitive manner. .
- the first terminal and the second terminal perform interaction of SCI and corresponding D2D communication data in the D2D communication resource pool.
- the method may be as follows:
- the first terminal freely competes to determine D2D SPS resource information.
- the first terminal when the first terminal determines the D2D SPS resource information in a freely competitive manner, the first terminal may be within the coverage of the base station, or may be outside the coverage of the base station, when the first terminal is in the coverage of the base station.
- the first terminal may acquire the D2D communication resource pool in a manner indicated by the base station.
- the first terminal When the first terminal is outside the coverage of the base station, the first terminal may acquire the D2D communication resource pool in a pre-configured manner.
- the base station may implement the RRC message. Further, the RRC message may carry the first indication information or the first The second indication information is used to indicate that the first terminal uses the manner notified by the base station to obtain the D2D SPS resource that can be used by the first terminal, and is not required to be acquired by using a freely competitive manner; the second indication information is used to indicate the first The terminal acquires in a freely competitive manner, and does not need to use the manner of base station notification to obtain the D2D SPS resources that the first terminal can use.
- the information of the plurality of D2D communication resource pools configured by the base station for D2D communication is obtained by reading the system information sent by the base station;
- the base station will pre-configure a designated D2D communication resource pool (for example, the first of all D2D communication resource pools) for all terminals under its coverage, specifically for the transmission or reception of "one-to-one" D2D communication.
- the method further includes the following operations:
- the first terminal starts a timer
- the first terminal sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS before the timer expires.
- the method further includes the following operations:
- the D2D SPS resource is released.
- the first terminal when the timer maintained by the first terminal times out, the first terminal considers that the D2D communication with the second terminal has ended, the D2D SPS resource has expired, and immediately stops sending the D2D communication data to the second terminal. .
- the D2D SPS resource information includes an SC resource and a D2D SPS data resource, where the information includes SCI and D2D communication data, the SCI includes a D2D SPS data resource and an SPS remaining time limit, and the SPS remaining time limit indicates the current D2D SC.
- the remaining valid time of the D2D SPS resource, the remaining time limit of the SPS is greater than one D2D SC cycle;
- the method may be as follows:
- the first terminal sends the SCI to the second terminal on the SC resource during the validity period of the D2D SPS, and sends the D2D communication data to the second terminal on the D2D SPS data resource.
- the remaining time limit of the SPS may be calculated by using the formula 1:
- N SPS-Due represents the D2D SPS validity period
- ⁇ N SC represents the time difference between the current SC period end time and the start time of the first terminal performing D2D communication using the D2D SPS resource.
- the ⁇ N SC is set to the start time of the SC cycle in which the SCI is located, thereby calculating the SPS remaining time limit, and including the SPS remaining time limit in the SCI.
- the SCI further includes an SCI indicator, where the SCI indicator is used to indicate that the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period refers to a time interval at which the first terminal can reuse the D2D SPS resource;
- the first terminal sends the SCI to the second terminal on the SC resource, and sends the D2D communication data to the second terminal on the D2D SPS data resource, including:
- the first terminal sends the SCI to the second terminal on the SC resource within the remaining time limit of the SPS, and periodically sends the D2D communication data to the second terminal on the D2D SPS data resource by using the SPS period.
- the SCI when the SCI includes the D2D SPS data resource, the SPS period, the SPS remaining time limit, and the SCI indicator, it may be as shown in Table 2.
- the SPS indicator when the SPS indicator is “1”, it indicates that the SCI is different from the existing SCI, and the D2D SPS data resource, the SPS period, and the SPS remaining time limit may be determined from the SCI.
- the first terminal uses the SPS period during the validity period of the D2D SPS, and periodically sends information to the second terminal on the D2D SPS resource, after determining the D2D SPS resource information.
- the first SC period is used as the starting time, and the SPS period is started, and information is periodically sent to the second terminal on the D2D SPS resource.
- the first terminal before transmitting the information to the second terminal, the first terminal needs to establish an RRC connection and enter an RRC connected state; after entering the RRC connected state, the base station sends a service service request to the network side; the network side receives the service.
- the network node MME Mobility Management Entity
- the network node MME Mobility Management Entity
- the implementation manner of the foregoing RRC connection establishment process may be as follows:
- Step 1 The first terminal sends an RRC connection request message to the base station.
- Step 2 The base station sends an RRC connection request setup message to the first terminal.
- Step 3 The first terminal sends an RRC connection setup complete message to the base station, completes the establishment of the RRC connection, and the first terminal enters the connected state.
- the information related to the establishment of the RRC connection is performed by using RRC signaling between the first terminal and the base station.
- the process of establishing the RRC connection is not required to be performed; if the first terminal is within the coverage of the base station, the process of establishing the RRC connection may be performed.
- the service request of the first terminal to be reported by the base station to the network side may be carried by a NAS (Non-Access Stratum) message; wherein the service service request indication is
- the service type of the request is a "one-to-one" D2D communication service, which further includes an identity of the called second terminal, for example, a mobile communication telephone number corresponding to the called second terminal.
- the MME on the network side initiates paging to the called second terminal by decoding the identity of the called second terminal, and the base station sends a paging message to the called second terminal to address the called second terminal.
- the called second terminal is triggered to perform RRC connection establishment.
- the D2D SPS validity period of the first terminal capable of using the D2D SPS resource is greater than one SC period, the first terminal only needs to determine the D2DSPS resource once during the validity period of the D2D SPS, and the second terminal only needs to decode the SCI once to determine the D2D.
- the SPS resources in this way, the first terminal does not need to determine the D2D SPS resources in each SC cycle, and the second terminal does not need to decode the SCI and determine the D2D SPS resources in each SC cycle, thus improving the D2D communication efficiency.
- Step 400 The second terminal decodes the link control information SCI sent by the first terminal, and the SCI includes the D2D SPS data resource that can be used in the D2D communication resource pool that the first terminal can use, and the remaining time limit of the SPS remaining time limit SPS indicates the current SC period. Start, the remaining valid time of the D2D SPS resource, the remaining time limit of the SPS is greater than one SC period;
- Step 410 The second terminal receives the D2D communication data sent by the first terminal on the D2D SPS data resource within the remaining time limit of the SPS.
- the D2D SPS resource information further includes an SPS indicator, where the SCI indicator is used to indicate that the SCI includes the D2D SPS data resource and the SPS remaining time limit;
- the second terminal includes the following operations before receiving the D2D communication data sent by the first terminal on the D2D SPS data resource within the remaining time limit of the SPS:
- the second terminal determines, according to the SCI indicator, that the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period refers to a time interval at which the first terminal can reuse the D2D SPS resource;
- the second terminal receives the first terminal to send on the D2D SPS data resource within the remaining time limit of the SPS.
- D2D communication data including:
- the second terminal receives the D2D communication data sent by the first terminal periodically on the D2D SPS data resource by using the SPS period within the remaining time limit of the SPS.
- the SPS period is related to the D2D communication data generation period and the SC period.
- the SCI carries the M bits identified by the layer 2
- the D2D communication data carries the N bits identified by the layer 2
- the layer 2 identifier is used to identify the first terminal and the second terminal.
- the sum of M bits and N bits is equal to all bits identified by layer 2;
- the second terminal before receiving the D2D communication data sent by the first terminal on the D2D SPS data resource, in the remaining time limit of the SPS, further includes:
- the second terminal acquires M bits identified by layer 2 from the SCI;
- the second terminal receives the MAC data packet, and obtains N bits of the layer 2 identifier from the MAC data packet;
- the second terminal determines that the M bits identified by layer 2 are obtained from the SCI, and the layer 2 identifier obtained from the combination of the N bits identified by layer 2 is the same as the stored layer 2 identifier.
- the second terminal includes the following operations before receiving the D2D communication data sent by the first terminal on the D2D SPS data resource in the remaining time limit of the SPS:
- the second terminal receives the layer 2 identifier sent by the base station, and the layer 2 identifies a pair of D2D communication terminals used for the first terminal to perform one-to-one D2D communication with the second terminal.
- the second terminal further includes the following operations:
- the second terminal starts a timer
- the second terminal when the second terminal receives the D2D communication data sent by the first terminal on the D2D SPS data resource, the second terminal may be configured as follows:
- the second terminal receives the D2D communication data sent by the first terminal on the D2D SPS resource within the remaining time limit of the SPS.
- the second terminal will immediately stop the first The D2D communication data sent by a terminal is received, and it is considered that the D2D communication with the first terminal has ended, and the above D2D SPS resource has expired.
- the second terminal before decoding the SCI, the second terminal further includes the following operations:
- the second terminal receives the paging message sent by the base station, establishes an RRC connection according to the paging message, and enters an RRC connected state.
- the second terminal after receiving the SCI from the first terminal for the first time, the second terminal continues to decode the corresponding SCI within the remaining time limit of the SPS, and determines, according to the decoded SCI information, the D2D SPS data resource within the remaining time limit of the SPS. Position, thereby obtaining the D2D SPS data resource used by the first terminal for D2D communication data transmission within the remaining time limit of the SPS; since the SPS remaining time period is greater than one SC period, the second terminal does not need to decode the SCI in each SC period, thereby reducing the SCI Decoding complexity and improve D2D communication efficiency.
- a base station As shown in FIG. 5A, in the embodiment of the present invention, a base station, a base station processing unit 50, and a sending unit 51 are provided, where:
- the processing unit 50 is configured to determine device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use, and the D2D SPS validity period refers to The first terminal can use the duration of the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- the sending unit 51 is configured to send the D2D SPS resource information to the first terminal.
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period is used to indicate a time interval at which the first terminal can reuse the D2D SPS resource.
- the processing unit 50 is further configured to: determine a D2D communication data generation period and an SC period of the first terminal; and determine an SPS period according to the D2D communication data generation period and the SC period.
- the processing unit 50 sends the D2D SPS resource information to the first terminal, specifically:
- the downlink control information DCI is sent to the first terminal, and the DCI carries the D2D SPS resource information.
- the method further includes a receiving unit 52, configured to receive a layer 2 identifier sent by the ProSe functional entity, and layer 2 identifies a pair of D2D communications used by the first terminal to perform one-to-one D2D communication with the second terminal. terminal;
- the sending unit 51 is further configured to forward the layer 2 identifier to the first terminal and the second terminal.
- the base station includes a processor 500 and a transmitter 510, where:
- the processor 500 is configured to determine device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use, and the D2D SPS validity period refers to The first terminal can use the duration of the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- the transmitter 510 is configured to send the D2D SPS resource information to the first terminal.
- the processor 500 is further configured to perform other operations performed by the processing unit 50
- the transmitter 510 is further configured to perform other operations performed by the sending unit 51
- the first terminal includes a processing unit 60 and a sending unit 61, where:
- the processing unit 60 is configured to determine device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use, and the D2D SPS validity period refers to The first terminal can use the duration of the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- the sending unit 61 is configured to send information to the second terminal on the D2D SPS resource during the D2D SPS validity period.
- the D2D SPS resource information further includes an SPS indicator, where the SPS indicator is used to indicate that the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period;
- the processing unit 60 determines the semi-statically scheduled SPS resource information from the device to the device D2D, the processing unit 60 is specifically:
- D2D SPS resource information including D2D SPS resources and D2D SPS according to the SPS indicator Validity period.
- the D2D SPS resource information further includes an SPS period, where the SPS period refers to a time interval at which the first terminal can reuse the D2D SPS resource;
- the sending unit 61 When the sending unit 61 sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS, the sending unit 61 is specifically:
- the SPS period is used to send information to the second terminal on the D2D SPS resource.
- the SPS period is related to the D2D communication data generation period and the SC period.
- the sending unit 61 is further configured to send a D2D communication request to the ProSe entity.
- a receiving unit 62 configured to receive a layer 2 identifier sent by the ProSe entity through the base station;
- the processing unit 60 is further configured to: select one layer 2 identifier from the preset at least one layer 2 identifier as the layer 2 identifier, and the dedicated layer 2 identifies a pair for the first terminal to perform one-to-one D2D communication with the second terminal. D2D communication terminal.
- the method further includes a receiving unit 62, configured to receive D2D SPS resource information sent by the base station.
- the processing unit 60 determines the D2D SPS resource information, specifically:
- the D2D SPS resource information is determined in a freely competitive manner.
- the processing unit 60 is further configured to start a timer.
- the sending unit 61 is further configured to send information to the second terminal on the D2D SPS resource during the D2D SPS validity period before the processing unit 60 determines that the timer expires.
- the processing unit 60 is further configured to: when determining that the timer expires, release the D2D SPS resource.
- the D2D SPS resource information includes an SC resource and a D2D SPS.
- Data resources including SCI and D2D communication data;
- the SCI includes the remaining time limit of the D2D SPS data resource SPS, and the remaining time limit of the SPS indicates the remaining valid time of the D2D SPS resource from the current SC period, and the remaining time limit of the SPS is greater than one SC period;
- the sending unit 61 When the sending unit 61 sends information to the second terminal on the D2D SPS resource during the validity period of the D2D SPS, the sending unit 61 is specifically:
- the SCI is sent to the second terminal on the SC resource, and the D2D communication data is sent to the second terminal on the D2D SPS data resource.
- the SCI further includes an SCI indicator, where the SCI indicator is used to indicate that the SCI includes the D2D SPS data resource and the SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period refers to a time interval during which the first terminal can repeatedly use the D2D SPS resource.
- the sending unit 61 sends the SCI to the second terminal on the SC resource and the D2D communication data to the second terminal on the D2D SPS data resource, in the remaining time limit of the SPS, specifically:
- the SCI is sent to the second terminal on the SC resource within the remaining time limit of the SPS, and the D2D communication data is periodically sent to the second terminal on the D2D SPS data resource by using the SPS period.
- the terminal device includes a processor 600 and a transmitter 610, where:
- the processor 600 is configured to determine device-to-device D2D semi-persistent scheduling SPS resource information, where the D2D SPS resource information includes a D2D SPS resource and a D2D SPS validity period that can be used in the D2D communication resource pool that the first terminal can use, and the D2D SPS validity period refers to The first terminal can use the duration of the D2D SPS resource, and the D2D SPS validity period is greater than one D2D link control SC period;
- the transmitter 610 is configured to send information to the second terminal on the D2D SPS resource during the D2D SPS validity period.
- the processor 600 is further configured to perform other operations performed by the processing unit 60
- the transmitter 610 is further configured to perform other operations performed by the sending unit 61
- a second terminal is provided, where the second terminal includes Processing unit 70 and receiving unit 71, wherein:
- the processing unit 70 is configured to decode the device-to-device D2D link control information SCI sent by the first terminal, where the SCI includes the D2D semi-persistent scheduling SPS data resource and the SPS remaining time limit that can be used in the D2D communication resource pool that the first terminal can use.
- the remaining time limit of the SPS indicates the remaining valid time of the D2D SPS resource from the current SC period, and the remaining time limit of the SPS is greater than one SC period;
- the receiving unit 71 is configured to receive D2D communication data sent by the first terminal on the D2D SPS data resource within a remaining time limit of the SPS.
- the D2D SPS resource information further includes an SPS indicator, where the SCI indicator is used to indicate that the SCI includes the D2D SPS data resource and the SPS remaining time limit;
- the processing unit 70 is further configured to determine, according to the SCI indicator, that the SCI includes a D2D SPS data resource and an SPS remaining time limit.
- the SCI further includes an SPS period, where the SPS period refers to a time interval during which the first terminal can repeatedly use the D2D SPS resource.
- the receiving unit 71 receives the D2D communication data sent by the first terminal on the D2D SPS data resource within the remaining time limit of the SPS, specifically:
- the D2D communication data sent by the first terminal is periodically received on the D2D SPS data resource by using the SPS period.
- the SPS period is related to the D2D communication data generation period and the SC period.
- the SCI carries the M bits identified by the layer 2
- the D2D communication data carries the N bits identified by the layer 2
- the layer 2 identifier is used to identify the first terminal and the second terminal.
- the sum of M bits and N bits is equal to all bits identified by layer 2;
- the processing unit 70 is further configured to: acquire, from the SCI, the M bits identified by the layer 2;
- the receiving unit 71 is further configured to receive a media access control MAC data packet
- the processing unit 70 is further configured to: obtain N bits identified by the layer 2 from the MAC data packet received by the receiving unit 71; and determine to obtain the M bits identified by the layer 2 from the SCI, and the slave layer 2
- the layer 2 identifier obtained by combining the identified N bits is the same as the stored layer 2 identifier.
- the receiving unit 71 is further configured to receive the layer 2 identifier sent by the base station, and the layer 2 identifies a pair of D2D communication terminals used by the first terminal to perform one-to-one D2D communication with the second terminal.
- the processing unit 70 is further configured to start a timer.
- the receiving unit 71 receives the D2D communication data sent by the first terminal on the D2D SPS data resource within the remaining time limit of the SPS, specifically:
- the processing unit 70 determines that the timer has not timed out, the D2D communication data sent by the first terminal is received on the D2D SPS resource within the remaining time limit of the SPS.
- the second terminal includes a processor 700 and a receiver 710, where:
- the processor 700 is configured to decode the device-to-device D2D link control information SCI sent by the first terminal, where the SCI includes the D2D semi-persistent scheduling SPS data resource, the SPS remaining time limit, and the SPS that can be used in the D2D communication resource pool that the first terminal can use.
- the remaining time limit indicates the remaining valid time of the D2D SPS resource from the current SC period, and the remaining time limit of the SPS is greater than one SC period;
- the receiver 710 is configured to receive D2D communication data sent by the first terminal on the D2D SPS data resource within a remaining time limit of the SPS.
- processor 700 is further configured to perform other operations performed by the processing unit 70
- receiver 710 is further configured to perform other operations performed by the receiving unit 71.
- a communication system including a base station as shown in FIG. 5A or FIG. 5B, a first terminal as shown in FIG. 6A or FIG. 6B, and a second as shown in FIG. 7A or FIG. 7B. terminal.
- embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
- computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
本发明实施例中提出一种D2D通信方法、装置及系统,在该方案中,由于第一终端能够使用D2D SPS资源的D2D SPS有效期大于一个SC周期,在D2D SPS有效期内第一终端只需要确定一次D2DSPS资源,第二终端也只需要解码一次SCI来确定D2D SPS资源,这样,第一终端不需要在每一个SC周期去确定D2D SPS资源,第二终端也不需要在每一个SC周期去解码SCI并确定D2D SPS资源,因此,提高了D2D通信效率。
Description
本发明涉及通信技术领域,尤其涉及一种D2D通信方法、装置及系统。
作为3GPP(3rd Generation Partnership Project,第三代移动通信标准化组织)LTE(Long Term Evolution,长期演进)蜂窝通信系统中的重要特性和关键技术,D2D(Device-to-Device Communication,设备到设备)通信技术近年来逐渐成为全球无线通信行业的研究热点,受到无线通信学术界和产业界的高度关注和广泛研究。D2D通信具有如下优点:1)有效提高UE(User Equipment,用户设备)间的数据传输速率和信息交互能力;2)节省所需无线资源、提高资源利用率;3)有效降低了UE间数据交互的通信时延。
D2D通信是指UE之间可以通过无线通信链路直接进行信息交互和无线数据传输,而不必像传统蜂窝网络一样,必须通过基站(Evolved Node B,演进型基站)转发的方式实现不同UE之间的无线通信。此外,对于LTE网络覆盖之外的UE,其同样可以利用D2D通信技术进行彼此间的无线通信,如图1A所示,从图1A可以看出处于网络覆盖之内的UE1和UE2可以实现D2D通信,处于网络覆盖之外的UE3和UE4也可以实现D2D通信。
D2D通信流程如图1B所示。具体步骤如下:
步骤1:UE1获取SL Grant(Sidelink Grant,D2D链路资源授权),该SL Grant用于指示UE1可用的D2D通信资源池中可用的D2D通信资源,可用的D2D通信资源的有效期为一个SC(Sidelink Control,链路控制)周期;
步骤2:在一个SC周期内,UE1利用D2D通信资源池中的可用的SC资源发送SCI(Sidelink Control Information,D2D链路控制信息);
该SCI用于指示步骤1中所分配的D2D数据资源的时频位置,以使接收端UE2能够通过解码所接收的SCI,确定UE1进行D2D数据传输的数据资源位置。
步骤3:在一个SC周期内,UE2接收并解码SCI,并根据其确定UE1发送D2D通信数据的D2D数据资源的位置;
步骤4:UE1利用D2D数据资源进行D2D通信,传输D2D通信数据;
步骤5:UE2根据步骤3中所确定的D2D数据资源的位置,接收UE1发送的D2D通信数据。
目前,D2D通信过程中,每次分配的D2D通信资源的有效期仅为一个SC周期,这样,在每个SC周期内,发送端都要重新确定D2D通信资源,接收端也要重新确定D2D通信资源,因此,D2D通信的效率较低。
发明内容
本发明实施例提供了一种D2D通信方法、装置及系统,用于解决目前D2D通信过程中存在的效率较低的缺陷。
第一方面,提供一种通信方法,包括:
基站确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;
所述基站将所述D2D SPS资源信息发送至所述第一终端。
结合第一方面,在第一种可能的实现方式中,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
结合第一方面,或者第一方面的第一种可能的实现方式,在第二种可能的实现方式中,所述D2D SPS资源信息还包括SPS周期,所述SPS周期用于指示所述第一终端能够重复使用所述D2D SPS资源的时间间隔。
结合第一方面的第二种可能的实现方式,在第三种可能的实现方式中,基站确定所述D2D SPS资源信息之前,还包括:
所述基站确定所述第一终端的D2D通信数据生成周期、SC周期;
所述基站根据所述D2D通信数据生成周期和所述SC周期,确定所述SPS周期。
结合第一方面,或者第一方面的第一种至第三种可能的实现方式,在第四种可能的实现方式中,所述基站将所述D2D SPS资源信息发送至所述第一终端,包括:
所述基站将下行控制信息DCI发送至所述第一终端,所述DCI携带所述D2D SPS资源信息。
结合第一方面,或者第一方面的第一种至第四种可能的实现方式,在第五种可能的实现方式中,所述基站将所述D2D SPS资源信息发送至所述第一终端之前,还包括:
所述基站接收ProSe功能实体发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端;
所述基站将所述层2标识转发至所述第一终端、所述第二终端。
第二方面,提供一种通信方法,包括:
第一终端确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;
所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
结合第二方面,在第一种可能的实现方式中,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期;
第一终端确定设备到设备D2D半静态调度SPS资源信息,包括:
所述第一终端根据所述SPS指示符,确定所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
结合第二方面,或者第二方面的第一种可能的实现方式,在第二种可能的实现方式中,所述D2D SPS资源信息还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;
所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息,包括:
所述第一终端在所述D2D SPS有效期内,采用所述SPS周期在所述D2D SPS资源上向第二终端发送信息。
结合第二方面的第二种可能的实现方式,在第三种可能的实现方式中,所述SPS周期与D2D通信数据生成周期和SC周期相关。
结合第二方面,或者第二方面的第一种至第三种可能的实现方式,在第四种可能的实现方式中,所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息之前,还包括:
所述第一终端向ProSe实体发送D2D通信请求,并接收所述ProSe实体通过基站发送的所述层2标识;或者
所述第一终端从预设的至少一个层2标识中选择一个层2标识,作为所述层2标识,所述专用层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
结合第二方面,或者第二方面的第一种至第四种可能的实现方式,在第五种可能的实现方式中,第一终端确定D2D SPS资源信息,包括:
所述第一终端接收基站发送的所述D2D SPS资源信息。
结合第二方面,或者第二方面的第一种至第五种可能的实现方式,在第六种可能的实现方式中,第一终端确定D2D SPS资源信息,包括:
所述第一终端采用自由竞争的方式确定所述D2D SPS资源信息。
结合第二方面的第六种可能的实现方式,在第七种可能的实现方式中,第一终端确定D2D SPS资源信息之后,还包括:
所述第一终端启动定时器;
所述第一终端在所述定时器超时前,在所述D2D SPS有效期内在所述
D2D SPS资源上向第二终端发送信息。
结合第二方面的第七种可能的实现方式,在第八种可能的实现方式中,所述方法还包括:
所述第一终端确定所述定时器超时时,释放所述D2D SPS资源。
结合第二方面,或者第二方面的第一种至第八种可能的实现方式,在第九种可能的实现方式中,所述D2D SPS资源信息包括SC资源和D2D SPS数据资源,所述信息包括SCI和D2D通信数据;
所述SCI包括所述D2D SPS数据资源SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;
所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息,包括:
所述第一终端在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
结合第二方面,或者第二方面的第一种至第九种可能的实现方式,在第十种可能的实现方式中,所述SCI还包括SCI指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
结合第二方面的第九种或者第十种可能的实现方式,在第十一种可能的实现方式中,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;
所述第一终端在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据,包括:
所述第一终端在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,并采用所述SPS周期,周期性的在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
第三方面,提供一种通信方法,包括:
第二终端解码第一终端发送的设备到设备D2D链路控制信息SCI,所述SCI包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D半静态调度SPS数据资源、SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;
所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
结合第三方面,在第一种可能的实现方式中,所述D2D SPS资源信息还包括SPS指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限;
所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据之前,还包括:
所述第二终端根据所述SCI指示符确定所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
结合第三方面,或者第三方面的第一种可能的实现方式,在第二种可能的实现方式中,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;
所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据,包括:
所述第二终端在所述SPS剩余时限内,采用所述SPS周期,周期性的在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
结合第三方面的第二种可能的实现方式,在第三种可能的实现方式中,所述SPS周期与D2D通信数据生成周期和SC周期相关。
结合第三方面,或者第三方面的第一种至第三种可能的实现方式,在第四种可能的实现方式中,所述SCI携带层2标识的M个比特位、所述D2D通信数据携带层2标识的N个比特位,所述层2标识用于标识所述第一终端与所述第二终端为进行一对一D2D通信的一组D2D通信组,所述M个比特位
与所述N个比特位之和等于所述层2标识的全部比特位;
所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据之前,还包括:
所述第二终端从所述SCI中获取所述层2标识的M个比特位;
所述第二终端接收媒体接入控制MAC数据包,并从MAC数据包中获取所述层2标识的N个比特位;
所述第二终端确定从所述SCI中获取所述层2标识的M个比特位,和从所述层2标识的N个比特位组合得到的层2标识,与存储的层2标识相同。
结合第三方面,或者第三方面的第一种至第四种可能的实现方式,在第五种可能的实现方式中,所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据之前,还包括:
所述第二终端接收基站发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
结合第三方面,或者第三方面的第一种至第五种可能的实现方式,在第六种可能的实现方式中,所述第二终端接收第一终端发送的SCI之后,还包括:
所述第二终端启动定时器;
所述第二终端在SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据,包括:
所述第二终端在所述定时器未超时时,在SPS剩余时限内,在所述D2D SPS资源上接收所述第一终端发送的D2D通信数据。
第四方面,提供一种基站,包括:
处理单元,用于确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;
发送单元,用于将所述D2D SPS资源信息发送至所述第一终端。
结合第四方面,在第一种可能的实现方式中,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
结合第四方面,或者第四方面的第一种可能的实现方式,在第二种可能的实现方式中,所述D2D SPS资源信息还包括SPS周期,所述SPS周期用于指示所述第一终端能够重复使用所述D2D SPS资源的时间间隔。
结合第四方面的第二种可能的实现方式,在第三种可能的实现方式中,所述处理单元还用于,确定所述第一终端的D2D通信数据生成周期、SC周期;并根据所述D2D通信数据生成周期和所述SC周期,确定所述SPS周期。
结合第四方面,或者第四方面的第一种至第三种可能的实现方式,在第四种可能的实现方式中,所述处理单元将所述D2D SPS资源信息发送至所述第一终端时,具体为:
将下行控制信息DCI发送至所述第一终端,所述DCI携带所述D2D SPS资源信息。
结合第四方面,或者第四方面的第一种至第四种可能的实现方式,在第五种可能的实现方式中,还包括接收单元,用于接收ProSe功能实体发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端;
所述发送单元还用于,将所述层2标识转发至所述第一终端、所述第二终端。
第五方面,提供一种第一终端,包括:
处理单元,用于确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;
发送单元,用于在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
结合第五方面,在第一种可能的实现方式中,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期;
所述处理单元确定设备到设备D2D半静态调度SPS资源信息时,具体为:
根据所述SPS指示符,确定所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
结合第五方面,或者第五方面的第一种可能的实现方式,在第二种可能的实现方式中,所述D2D SPS资源信息还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;
所述发送单元在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息时,具体为:
在所述D2D SPS有效期内,采用所述SPS周期在所述D2D SPS资源上向第二终端发送信息。
结合第五方面的第二种可能的实现方式,在第三种可能的实现方式中,所述SPS周期与D2D通信数据生成周期和SC周期相关。
结合第五方面,或者第五方面的第一种至第三种可能的实现方式,在第四种可能的实现方式中,所述发送单元还用于,向ProSe实体发送D2D通信请求;
还包括接收单元,用于接收所述ProSe实体通过基站发送的所述层2标识;或者
所述处理单元还用于,从预设的至少一个层2标识中选择一个层2标识,作为所述层2标识,所述专用层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
结合第五方面,或者第五方面的第一种至第四种可能的实现方式,在第
五种可能的实现方式中,还包括接收单元,用于接收基站发送的所述D2D SPS资源信息。
结合第五方面,或者第五方面的第一种至第五种可能的实现方式,在第六种可能的实现方式中,所述处理单元确定D2D SPS资源信息时,具体为:
采用自由竞争的方式确定所述D2D SPS资源信息。
结合第五方面的第六种可能的实现方式,在第七种可能的实现方式中,所述处理单元还用于,启动定时器;
所述发送单元还用于,在所述处理单元确定所述定时器超时前,在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
结合第五方面的第七种可能的实现方式,在第八种可能的实现方式中,所述处理单元还用于,在确定所述定时器超时时,释放所述D2D SPS资源。
结合第五方面,或者第五方面的第一种至第八种可能的实现方式,在第九种可能的实现方式中,所述D2D SPS资源信息包括SC资源和D2D SPS数据资源,所述信息包括SCI和D2D通信数据;
所述SCI包括所述D2D SPS数据资源SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;
所述发送单元在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息时,具体为:
在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
结合第五方面,或者第五方面的第一种至第九种可能的实现方式,在第十种可能的实现方式中,所述SCI还包括SCI指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
结合第五方面的第九种或者第十种可能的实现方式,在第十一种可能的实现方式中,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;
所述发送单元在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据时,具体为:
在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,并采用所述SPS周期,周期性的在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
第六方面,提供一种第二终端,包括:
处理单元,用于解码第一终端发送的设备到设备D2D链路控制信息SCI,所述SCI包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D半静态调度SPS数据资源、SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;
接收单元,用于在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
结合第六方面,在第一种可能的实现方式中,所述D2D SPS资源信息还包括SPS指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限;
所述处理单元还用于,根据所述SCI指示符确定所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
结合第六方面,或者第六方面的第一种可能的实现方式,在第二种可能的实现方式中,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;
所述接收单元在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据时,具体为:
在所述SPS剩余时限内,采用所述SPS周期,周期性的在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
结合第六方面的第二种可能的实现方式,在第三种可能的实现方式中,
所述SPS周期与D2D通信数据生成周期和SC周期相关。
结合第六方面,或者第六方面的第一种至第三种可能的实现方式,在第四种可能的实现方式中,所述SCI携带层2标识的M个比特位、所述D2D通信数据携带层2标识的N个比特位,所述层2标识用于标识所述第一终端与所述第二终端为进行一对一D2D通信的一组D2D通信组,所述M个比特位与所述N个比特位之和等于所述层2标识的全部比特位;
所述处理单元还用于,从所述SCI中获取所述层2标识的M个比特位;
所述接收单元还用于,接收媒体接入控制MAC数据包;
所述处理单元还用于,从所述接收单元接收到的MAC数据包中获取所述层2标识的N个比特位;并确定从所述SCI中获取所述层2标识的M个比特位,和从所述层2标识的N个比特位组合得到的层2标识,与存储的层2标识相同。
结合第六方面,或者第六方面的第一种至第四种可能的实现方式,在第五种可能的实现方式中,所述接收单元还用于,接收基站发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
结合第六方面,或者第六方面的第一种至第五种可能的实现方式,在第六种可能的实现方式中,所述处理单元还用于,启动定时器;
所述接收单元在SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据时,具体为:
在所述处理单元确定所述定时器未超时时,在SPS剩余时限内,在所述D2D SPS资源上接收所述第一终端发送的D2D通信数据。
第七方面,提供一种通信系统,包括如第四方面,或者第四方面的第一种至第五种可能的实现方式所述的基站、如第五方面,或者第五方面的第一种至第十一种可能的实现方式所述的第一终端,及如第六方面,或者第六方面的第一种至第六种可能的实现方式所述的第二终端。
本发明实施例中,提出一种D2D通信方法,在该方案中,由于第一终端
能够使用D2D SPS资源的D2D SPS有效期大于一个SC周期,在D2D SPS有效期内第一终端只需要确定一次D2DSPS资源,第二终端也只需要解码一次SCI来确定D2D SPS资源,这样,第一终端不需要在每一个SC周期去确定D2D SPS资源,第二终端也不需要在每一个SC周期去解码SCI并确定D2D SPS资源,因此,提高了D2D通信效率。
图1A为现有技术中提供的D2D通信场景架构图;
图1B为现有技术中提供的D2D通信流程图;
图2为本发明实施例提供的一种通信流程图;
图3为本发明实施例提供的另一种通信流程图
图4为本发明实施例提供的另一种通信流程图;
图5A为本发明实施例提供的基站的一种示意图;
图5B为本发明实施例提供的基站的另一种示意图;
图6A为本发明实施例提供的第一终端的一种示意图;
图6B为本发明实施例提供的第一终端的另一种示意图;
图7A为本发明实施例提供的第二终端的一种示意图;
图7B为本发明实施例提供的第二终端的另一种示意图。
为了使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明作进一步地详细描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
为了便于理解本发明所描述的技术方案,下面对本发明所涉及的技术术语、适用场景进行简单描述。
本发明涉及的技术术语
D2D通信:指用UE之间可以通过无线通信链路直接进行信息交互和无线数据传输,而不必像传统蜂窝通信中通过基站进行数据和信息的转发;
D2D通信数据:指UE通过D2D通信传输的业务数据;
ProSe Function:现有3GPP协议中,位于LTE系统核心网侧的网络节点;用于在D2D通信中为UE进行授权和参数配置,是一个网络节点,可能是一个单独的设备,也可能是某个设备中的一个功能模块;
网络侧:指的是LTE网络及相关网络节点,本发明中网络侧主要涉及基站、MME(Mobile Management Entity,移动性管理实体)、ProSe Function等节点。
D2D通信所使用的无线通信资源及相应的资源分配机制,是影响D2D性能的关键因素之一,基站配置若干个D2D通信专用的“D2D通信资源池”,以避免其对现有LTE网络中的蜂窝通信产生干扰。所谓“资源池”是指一组用于无线通信的时间、频率资源集合。“D2D通信资源池”包括两个资源池,这两个资源池在时间上具有先后顺序,前一个资源池所包含的资源称为“SC资源”,用于传输与资源调度分配相关的SCI;后一个资源池所包含的资源称为“D2D数据资源”,用于UE传输D2D通信数据本身。每个D2D通信资源池具有一个周期,称为“D2D SC周期”,D2D通信资源池则按照所对应的D2D SC周期进行周期性重复。
D2D通信中,每个UE还将被分配一个长度为24bits的专用“层2标识”,用于UE间进行D2D通信的寻址,所谓D2D通信的寻址,是指发送端将上述“层2标识”包含在所发送的SCI和D2D通信数据中;接收端接收数据时将根据所解码的“层2标识”,选择性接收与其进行D2D通信的特定UE所发送的数据、避免错误地接收与自身不相关的D2D通信数据。
具体地,发送端在发送D2D通信数据时,会将上述“层2标识”的前8比特包含在所发送的SCI中、并将剩余16比特包含在由该SCI指示的D2D数据资源所传输的MAC(Medium Access Control,媒体接入控制层)数据包的包头
中;相应地,接收端在接收D2D数据时,会首先从SCI中解码上述“层2标识”的前8比特,并选择性地从其所指示资源上接收的MAC数据包头中解码剩余16比特。只有所解码的“层2标识”与接收端UE自身的“层2标识”完全相符,接收端才会判定相应D2D通信数据确实来自于与其进行D2D通信的发送端、并予以接收;否则,将不予接收。
现有D2D通信系统中,对于基站覆盖范围内的UE,基站通过网络节点“ProSe Function”分配“层2标识”,并通过PC3接口将“层2标识”发送给UE;而对于基站覆盖范围外的UE,其所对应的“层2标识”将被预配置在UE中。
本发明所适用的系统架构或场景
根据目前3GPP相关标准和技术规范,D2D通信的一个主要应用场景是“一对一”D2D通信,如图1A所示。所谓的“一对一”D2D通信,是指两个特定的UE在进行D2D通信前首先进行匹配和同步,形成“D2D通信对”,之后基于单播(Uni-cast)进行信息传输的D2D通信方式。在“一对一”通信中,发送端UE向特定UE发送D2D通信数据,相应地接收端UE接收来自特定UE发送的数据。如图1A所示,对于在LTE网络覆盖下的UE1和UE2,可以通过与基站的信令交互,在网络控制下进行匹配与同步,形成D2D通信对,复用LTE系统的频段进行D2D通信;而对于在LTE网络覆盖外的UE3和UE4,可以通过彼此间D2D同步信号的传输,或利用一些现有短距离无线通信技术(如,蓝牙等),自主进行匹配和同步,形成D2D通信对,在网络运营商预配置的频谱上进行无覆盖下的D2D通信。
本发明涉及的具体网元如下:
基站:主要功能是实现LTE系统中UE的无线通信以及相关控制功能。
终端:主要功能是实现移动用户的无线数据发送与接收(本发明主要指进行D2D通信的UE)。
基站调度器:主要功能是执行LTE系统中多用户UE间的协调及无线资源分配。
下面结合说明书附图对本发明优选的实施方式进行详细说明,应当理解,
此处所描述的优选实施例仅用于说明和解释本发明,并不用于限定本发明,并且在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。
下面结合附图对本发明实施例进行详细说明。参阅图2所示,本发明实施例中,一种D2D通信方法的具体流程如下:
步骤200:基站确定D2D SPS(Semi-Persistent Scheduling,半静态调度)资源信息,D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,D2D SPS有效期是指第一终端能够使用D2D SPS资源的时长,D2D SPS有效期大于一个SC周期;
步骤210:基站将D2D SPS资源信息发送至第一终端。
本发明实施例中,第一终端能够采用的D2D SPS资源可以是一个资源,也可以是一个包括至少两个资源的资源组,在此不做具体限定。其中,一个资源包括时域资源和/或频域资源。
例如,第一终端能够采用的D2D SPS资源包括第一资源,第一资源包括子帧1和频段1,在这种情况下,第一终端能够采用的子帧为子帧1,能够采用的频段为频段1;或者,第一终端能够采用的D2D SPS资源包括第一资源、第二资源和第三资源,第一资源包括子帧1和频段1,第二资源包括子帧3和频段2,第三资源包括子帧5和频段5,在这种情况下,第一终端能够采用的子帧为子帧1、子帧3和子帧5,能够采用的频段为频段1、频段2和频段5。
上述是以一个资源同时包括时域资源和频域资源为例进行说明,当然,一个资源也可以仅仅包括时域资源,或者是频域资源。
例如,第一终端能够采用的D2D SPS资源包括第一资源、第二资源、第三资源、第四资源、第五资源和第六资源,第一资源包括子帧1、第二资源包括频段1、第三资源包括子帧3、第四资源包括频段2、第五资源包括子帧5、第六资源包括频段5,在这种情况下,第一终端能够采用的子帧为子帧1、子帧3和子帧5,能够采用的频段为频段1、频段2和频段5。
本发明实施例中,可选的,D2D SPS有效期也可以以SC周期作为基本单位,也就是说,D2D SPS有效期可以为X个SC周期,X为大于或者等于1
的正数。
例如,D2D SPS有效期可以是10个SC周期,或者,也可以是20个SC周期,或者,也可以是30个SC周期等,当然,也可以为其他数量的SC周期,在此不做具体限定。
本发明实施例中,进一步的,D2D SPS资源信息还包括SPS指示符,SPS指示符用于指示D2D SPS资源信息包括D2D SPS资源和D2D SPS有效期。
本发明实施例中,进一步的,D2D SPS资源信息还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔。
本发明实施例中,可选的,SPS周期以SC周期作为基本单位,也就是说,SPS周期可以为X个SC周期,X为大于或者等于1的正数。
例如,SPS周期可以是1个SC周期,或者,也可以是2个SC周期,或者,也可以是3个SC周期,当然,也可以为其他数量的SC周期,在此不做具体限定。
由于步骤200-210描述的是基站将第一终端能够使用的D2D SPS资源指示给第一终端,因此,第一终端是处于基站覆盖范围之内的,在这种情况下,基站还要向第一终端发送第一终端能够使用的D2D通信资源池的信息,因此,本发明实施例中,进一步的,基站确定D2D SPS资源信息之前,还包括如下操作:
基站向第一终端发送RRC(Radio Resource Control,无线资源控制)消息,RRC消息中携带第一终端能够使用的D2D通信资源池的信息。
进一步的,上述RRC消息还可以携带第一指示信息,第一指示信息用于指示第一终端采用基站通知的方式来获取第一终端能够使用的D2D SPS资源,不需要通过自由竞争的方式来获取。
由于第二终端也要确定D2D通信资源池,所以,基站也要将RRC消息发送给第二终端,第一终端和第二终端均确定D2D通信资源池后,完成D2D通信资源池的配置。
进一步的,基站向第一终端发送RRC消息之后,还要执行如下操作:
基站接收第一终端发送的D2D ProSe BSR(Buffer Status Report,缓存状态报告)、上报D2D通信所需传输的数据量。
本发明实施例中,进一步的,基站确定D2D SPS资源信息之前,还包括如下操作:
基站确定第一终端的D2D通信数据生成周期、SC周期;
基站根据D2D通信数据生成周期和SC周期,确定SPS周期。
例如,SPS周期设置为D2D通信数据生成周期与SC周期的最小公倍数。
本发明实施例中,基站确定第一终端的D2D通信数据生成周期时,可以采用如下方式:
基站根据第一终端发送的调度请求,确定第一终端待传输的D2D通信数据具有周期性生成特性、需要周期性调度,并获取D2D通信数据生成周期。
例如,基站可以通过感知第一终端的调度请求的上报频率及ProSe BSR上报的数据量获取相应D2D通信数据生成周期。
又例如,基站也可通过第一终端发送的ProSe BSR中包含的LCGID(Logical Channel Group Identity,逻辑信道组标识)判断其待传输的D2D通信数据为VoIP(Voice over Internet Protocol,IP承载语音)话音数据或流媒体等具有周期特性的数据类型,以获取D2D通信数据生成周期。
本发明实施例中,可选的,基站将D2D SPS资源信息发送至第一终端时,可选的,可以采用如下方式:
基站将DCI(Downlink Control Information,下行控制信息)发送至第一终端,DCI携带D2D SPS资源信息。
例如,D2D SPS资源信息包括DCI,DCI可以如表1所示。
表1 DCI格式示意图
本发明实施例中,如果D2D SPS资源信息包括SPS指示符,且D2D SPS资源信息是携带在DCI中的话,第一终端接收到DCI的话,根据SPS指示符确定DCI不是现有技术的DCI,而是包括D2D SPS资源信息的DCI。
本发明实施例中,基站将D2D SPS资源信息发送至第一终端之前,还包括如下操作:
基站接收ProSe功能实体发送的层2标识,层2标识用于第一终端与第二终端进行一对一D2D通信的一对D2D通信终端;
基站将层2标识转发至第一终端、第二终端。
也就是说,在D2D一对一通信场景中,第一终端和第二终端要有一个只有对方能够识别出的标识,这个标识要由基站分配给两个终端。
可选的,基站将层2标识发送至第一终端、第二终端时,可以通过PC3接口发送。
本发明实施例中,基站将D2D SPS资源信息发送至第一终端后,还要执行如下操作:
基站启动定时器,当定时器超时时,释放为第一终端分配的D2D SPS资源。
本发明实施例中,上述过程描述的是,第一终端处于基站覆盖范围之内,且通过基站指示的方式来确定D2D SPS资源,而不是通过自由竞争的方式来获取的。
当然,实际应用中,还可能包括如下情况,第一终端处于基站覆盖范围
之内,但是不是通过基站指示的方式来确定D2D SPS资源,而是通过自由竞争的方式来获取的,在这种情况下,基站不向第一终端发送D2D SPS资源信息,但是可以向第一终端发送RRC消息,RRC消息中携带第一终端能够使用的D2D通信资源池的信息。
进一步的,上述RRC消息还可以携带第二指示信息,第二指示信息用于指示第一终端可以通过自由竞争的方式来获取D2D SPS资源,不需要采用基站通知的方式来获取第一终端能够使用的D2D SPS资源。
在该方案中,由于第一终端能够使用D2D SPS资源的D2D SPS有效期大于一个SC周期,在D2D SPS有效期内第一终端只需要确定一次D2DSPS资源,第二终端也只需要解码一次SCI来确定D2D SPS资源,这样,第一终端不需要在每一个SC周期去确定D2D SPS资源,第二终端也不需要在每一个SC周期去解码SCI并确定D2D SPS资源,因此,提高了D2D通信效率。
参阅图3所示,本发明实施例中,另一种D2D通信方法的具体流程如下:
步骤300:第一终端确定D2D SPS资源信息,D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,D2D SPS有效期是指第一终端能够使用D2D SPS资源的时长,D2D SPS有效期大于一个链路控制SC周期;
步骤310:第一终端在D2D SPS有效期内,在D2D SPS资源上向第二终端发送信息。
本发明实施例中,第一终端能够采用的D2D SPS资源可以是一个资源,也可以是一个包括至少两个资源的资源组,在此不做具体限定。其中,一个资源包括时域资源和/或频域资源。
例如,第一终端能够采用的D2D SPS资源包括第一资源,第一资源包括子帧1和频段1,在这种情况下,第一终端能够采用的子帧为子帧1,能够采用的频段为频段1;或者,第一终端能够采用的D2D SPS资源包括第一资源、第二资源和第三资源,第一资源包括子帧1和频段1,第二资源包括子帧3和频段2,第三资源包括子帧5和频段5,在这种情况下,第一终端能够采用的
子帧为子帧1、子帧3和子帧5,能够采用的频段为频段1、频段2和频段5。
上述是以一个资源同时包括时域资源和频域资源为例进行说明,当然,一个资源也可以仅仅包括时域资源,或者是频域资源。
例如,第一终端能够采用的D2D SPS资源包括第一资源、第二资源、第三资源、第四资源、第五资源和第六资源,第一资源包括子帧1、第二资源包括频段1、第三资源包括子帧3、第四资源包括频段2、第五资源包括子帧5、第六资源包括频段5,在这种情况下,第一终端能够采用的子帧为子帧1、子帧3和子帧5,能够采用的频段为频段1、频段2和频段5。
第一终端确定D2D通信资源池的方式有两种,第一种为通过RRC消息来获取,第二种为通过预先配置的方式来获取。
需要说明的是,第一终端通过基站发送的RRC消息获取D2D通信资源池的方式的话,第一终端可以通过基站指示来获取D2D SPS资源,也可以自行竞争的方式来获取D2D SPS资源。第一终端通过预先配置的方式来获取的话,第一终端只能通过自行竞争的方式来获取。本发明实施例中,为了使第一终端快速确定出D2D SPS资源信息包括D2D SPS资源和D2D SPS有效期,D2D SPS资源信息还包括SPS指示符,SPS指示符用于指示D2D SPS资源信息包括D2D SPS资源和D2D SPS有效期;
此时,第一终端确定设备到设备D2D SPS资源信息时,可以采用如下方式:
第一终端根据SPS指示符,确定D2D SPS资源信息包括D2D SPS资源和D2D SPS有效期。
也就是说,第一终端确定出SPS指示符后,就知道D2D SPS资源信息包括如下内容:D2D SPS资源和D2D SPS有效期。进而利用D2D SPS资源信息来发送信息,避免用现有的方式来发送信息。
本发明实施例中,D2D SPS资源信息还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔;
可选的,第一终端在D2D SPS有效期内在D2D SPS资源上向第二终端发
送信息时,可以采用如下方式:
第一终端在D2D SPS有效期内,采用SPS周期在D2D SPS资源上向第二终端发送信息。
本发明实施例中,可选的,SPS周期与D2D通信数据生成周期和SC周期相关。
本发明实施例中,由于是一对一D2D通信场景,第一终端在跟第二终端发送信息之前,还要与第二终端进行配对,这样,第一终端和第二终端之间才知道是跟哪个终端进行D2D通信。
本发明实施例中,第一终端跟第二终端进行匹配可以通过基站来实现,也可以通过自由竞争来实现,因此,第一终端在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息之前,还包括如下操作:
第一终端向ProSe实体发送D2D通信请求,并接收ProSe实体通过基站发送的层2标识;或者
第一终端从预设的至少一个层2标识中选择一个层2标识,作为第一终端的层2标识,专用层2标识用于第一终端与第二终端进行一对一D2D通信的一对D2D通信终端。
本发明实施例中,可选的,D2D通信请求可以是OMA(Object Management Architecture,对象管理体系结构)终端管理消息。
进一步的,第一终端向ProSe实体发送D2D通信请求后,还可以获得第一终端和第二终端的身份标识,第一终端的身份标识可以是IMSI(International Mobile Subscriber Identity,国际移动用户识别码)或所对应的移动通信电话号码等,第二终端的身份标识可以是IMSI或者所对应的移动通信电话号码等。
本发明实施例中,第一终端接收ProSe实体通过基站发送的层2标识时,可选的,通过PC3接口接收ProSe实体通过基站发送的层2标识。
本发明实施例中,第一终端确定D2D SPS资源时,可以是基站指示的,也可以是通过自由竞争的方式获取的,因此,第一终端确定D2D SPS资源信息时,可以采用如下方式:
第一终端接收基站发送的D2D SPS资源信息。
本发明实施例中,第一终端接收基站发送的D2D SPS资源信息时,可选的,可以采用如下方式:
第一终端接收基站发送的DCI,DCI包括D2D SPS资源信息。
也就是说,D2D SPS资源信息承载在DCI中。
需要说明的是,如果第一终端通过基站指示来获取D2D SPS资源时,第一终端处于基站覆盖范围之内,在这种情况下,第一终端还要接收基站发送的RRC消息,RRC消息中携带第一终端能够使用的D2D通信资源池的信息。
进一步的,上述RRC消息还可以携带第一指示信息,第一指示信息用于指示第一终端采用基站通知的方式来获取第一终端能够使用的D2D SPS资源,不需要通过自由竞争的方式来获取。
本发明实例中,第一终端和第二终端在该D2D通信资源池中进行SCI及相应D2D通信数据的交互。
或者,第一终端确定D2D SPS资源信息时,可选的,可以采用如下方式:
第一终端自由竞争确定D2D SPS资源信息。
需要说明的是,第一终端通过自由竞争的方式来确定D2D SPS资源信息时,第一终端可以处于基站覆盖范围之内,也可以处于基站覆盖范围之外,当第一终端处于基站覆盖范围之内时,第一终端可以通过基站指示的方式来获取D2D通信资源池,当第一中处于基站覆盖范围之外时,第一终端可以通过预先配置的方式来获取D2D通信资源池。
其中,当第一终端处于基站覆盖范围之内的时候,基站向第一终端指示D2D通信资源池的时候,基站可以通过RRC消息来实现,进一步的,RRC消息中可以携带第一指示信息或者第二指示信息,第一指示信息用于指示第一终端采用基站通知的方式来获取第一终端能够使用的D2D SPS资源,不需要通过自由竞争的方式来获取;第二指示信息用于指示第一终端通过自由竞争的方式来获取,不需要采用基站通知的方式来获取第一终端能够使用的D2D SPS资源。
本发明实施例中,第一终端位于基站覆盖范围下时,首先通过读取基站所发送的系统信息的方式,获取基站为D2D通信配置的若干个D2D通信资源池的信息;在这些资源池中,基站将为其覆盖下的所有终端预配置一个指定的D2D通信资源池(例如,所有D2D通信资源池中的第一个),专门用于“一对一”D2D通信的发送或者接收。
而对于处于基站覆盖范围外的终端,会在预配置的频谱所对应的D2D通信资源池上,进行自由竞争,自由竞争获取资源。
为了避免资源的浪费,本发明实施例中,第一终端确定D2D SPS资源信息之后,还包括如下操作:
第一终端启动定时器;
第一终端在定时器超时前,在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息。
进一步的,方法还包括如下操作:
第一终端确定定时器超时时,释放D2D SPS资源。
本发明实施例中,当第一终端所维护的定时器超时,第一终端认为与第二终端之间的D2D通信已结束,上述D2D SPS资源已失效,立即停止对第二终端发送D2D通信数据。
本发明实施例中,可选的,D2D SPS资源信息包括SC资源和D2D SPS数据资源,信息包括SCI和D2D通信数据,SCI包括D2D SPS数据资源和SPS剩余时限,SPS剩余时限表示从当前D2D SC周期开始,D2D SPS资源的剩余有效时间,SPS剩余时限大于一个D2D SC周期;
其中,第一终端在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息时,可选的,可以采用如下方式:
第一终端在D2D SPS有效期内,在SC资源上向第二终端发送SCI,在D2D SPS数据资源上向第二终端发送D2D通信数据。
本发明实施例中,可选的,SPS剩余时限可以采用公式一进行计算:
SPS剩余时限=NSPS-Due-ΔNSC (公式一)
其中,NSPS-Due表示D2D SPS有效期,ΔNSC表示当前SC周期结束时刻与第一终端利用D2D SPS资源进行D2D通信的起始时刻之间的时间差。
在每次SCI传输时,该ΔNSC即被设置为该SCI所在SC周期的起始时刻,以此计算SPS剩余时限,并将SPS剩余时限包含在SCI中发送。
进一步的,为了使第二终端能够快速确定出SCI,SCI还包括SCI指示符,SCI指示符用于指示SCI包括D2D SPS数据资源和SPS剩余时限。
进一步的,SCI还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔;
第一终端在SPS剩余时限内,在SC资源上向第二终端发送SCI,在D2D SPS数据资源上向第二终端发送D2D通信数据,包括:
第一终端在SPS剩余时限内,在SC资源上向第二终端发送SCI,并采用SPS周期,周期性的在D2D SPS数据资源上向第二终端发送D2D通信数据。
本发明实施例中,SCI包括D2D SPS数据资源、SPS周期、SPS剩余时限和SCI指示符时,可以如表2所示。
表2 SCI格式示意图
其中,可选的,SPS指示符为“1”时,表示SCI为跟现有的SCI是不同的,可以从SCI确定出D2D SPS数据资源、SPS周期、SPS剩余时限。
其中,当SPS剩余时限为“000”时,表示剩余1个SC周期,当SPS剩余时限为“001”时,表示剩余2个SC周期。
同理,当SPS周期为“000”时,表示SPS周期为1个SC周期,当SPS周期为“001”时,表示SPS周期为2个SC周期。
本发明实施例中,为了减少D2D通信时延,第一终端在D2D SPS有效期内,采用SPS周期,周期性的在D2D SPS资源上向第二终端发送信息时,从确定D2D SPS资源信息后的首个SC周期作为起始时刻,开始采用SPS周期,周期性的在D2D SPS资源上向第二终端发送信息。
本发明实施例中,第一终端在向第二终端发送信息之前,要建立RRC连接,进入RRC连接态;在进入RRC连接态后,通过基站向网络侧发送业务服务请求;网络侧收到业务服务请求后,由网络节点MME(Mobility Management Entity,移动性管理实体)发起对被叫第二终端的寻呼、并由基站向第二终端发送寻呼消息。
可选的,上述RRC连接建立过程的实现方法可以如下:
步骤1:第一终端向基站发送RRC连接请求消息;
步骤2:基站向第一终端发送RRC连接请求建立消息;
步骤3:第一终端向基站发送RRC连接建立完成消息,完成RRC连接建立,第一终端进入连接态。
上述RRC连接建立相关的信息,均为通过第一终端和基站间的RRC信令进行交互。
需要说明的是,如果第一终端处于基站覆盖范围之外的话,是不需要执行上述建立RRC连接的过程的;如果第一终端处于基站覆盖范围之内的话,可以执行上述建立RRC连接的过程。
上述第一终端通过基站向网络侧上报的业务服务请求可以通过NAS(Non-Access Stratum,非接入层)消息承载;其中,该业务服务请求指示所
请求的业务类型为“一对一”D2D通信业务,其还包括被叫第二终端的身份标识,例如,被叫第二终端所对应的移动通信电话号码等。
网络侧的MME通过解码上述被叫第二终端的身份标识,发起对被叫第二终端的寻呼,由基站向被叫第二终端发送寻呼消息,对被叫第二终端进行寻址,进而触发被叫第二终端进行RRC连接建立。
在该方案中,由于第一终端能够使用D2D SPS资源的D2D SPS有效期大于一个SC周期,在D2D SPS有效期内第一终端只需要确定一次D2DSPS资源,第二终端也只需要解码一次SCI来确定D2D SPS资源,这样,第一终端不需要在每一个SC周期去确定D2D SPS资源,第二终端也不需要在每一个SC周期去解码SCI并确定D2D SPS资源,因此,提高了D2D通信效率。
参阅图4所示,本发明实施例中,另一种D2D通信方法的具体流程如下:
步骤400:第二终端解码第一终端发送的链路控制信息SCI,SCI包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS数据资源、SPS剩余时限SPS剩余时限表示从当前SC周期开始,D2D SPS资源的剩余有效时间,SPS剩余时限大于一个SC周期;
步骤410:第二终端在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据。
进一步的,为了使第二终端快速确定出D2D SPS资源信息,进一步的,D2D SPS资源信息还包括SPS指示符,SCI指示符用于指示SCI包括D2D SPS数据资源和SPS剩余时限;
此时,第二终端在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据之前,还包括如下操作:
第二终端根据SCI指示符确定SCI包括D2D SPS数据资源和SPS剩余时限。
进一步的,SCI还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔;
第二终端在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送
的D2D通信数据,包括:
第二终端在SPS剩余时限内,采用SPS周期,周期性的在D2D SPS数据资源上接收第一终端发送的D2D通信数据。
本发明实施例中,可选的,SPS周期与D2D通信数据生成周期和SC周期相关。
本发明实施例中,可选的,SCI携带层2标识的M个比特位、D2D通信数据携带层2标识的N个比特位,层2标识用于标识第一终端与第二终端为进行一对一D2D通信的一组D2D通信组,M个比特位与N个比特位之和等于层2标识的全部比特位;
第二终端在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据之前,还包括:
第二终端从SCI中获取层2标识的M个比特位;
第二终端接收MAC数据包,并从MAC数据包中获取层2标识的N个比特位;
第二终端确定从SCI中获取层2标识的M个比特位,和从层2标识的N个比特位组合得到的层2标识,与存储的层2标识相同。
本发明实施例中,第二终端在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据之前,还包括如下操作:
第二终端接收基站发送的层2标识,层2标识用于第一终端与第二终端进行一对一D2D通信的一对D2D通信终端。
进一步的,第二终端接收第一终端发送的SCI之后,还包括如下操作:
第二终端启动定时器;
此时,第二终端在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据时,可选的,可以采用如下方式:
第二终端在定时器未超时时,在SPS剩余时限内,在D2D SPS资源上接收第一终端发送的D2D通信数据。
也就是说,当第二终端所维护定时器超时时;第二终端将立即停止对第
一终端发送的D2D通信数据进行接收,并认为与第一终端之间的D2D通信已经结束,上述D2D SPS资源已失效。
本发明实施例中,第二终端在解码SCI之前,还包括如下操作:
第二终端接收基站发送的寻呼消息,根据寻呼消息建立RRC连接,进入RRC连接态。
在该方案中,第二终端在首次接收到来自第一终端的SCI后,持续在SPS剩余时限内对相应SCI进行解码,并根据所解码的SCI信息,确定SPS剩余时限内D2D SPS数据资源的位置,从而获取SPS剩余时限内第一终端用于D2D通信数据传输的D2D SPS数据资源;由于SPS剩余时限内大于一个SC周期,因此第二终端无需在每个SC周期解码SCI,从而降低SCI的解码复杂度,提高D2D通信效率。
参阅图5A所示,本发明实施例中,提出一种基站,该基站处理单元50、发送单元51,其中:
处理单元50,用于确定设备到设备D2D半静态调度SPS资源信息,D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,D2D SPS有效期是指第一终端能够使用D2D SPS资源的时长,D2D SPS有效期大于一个D2D链路控制SC周期;
发送单元51,用于将D2D SPS资源信息发送至第一终端。
本发明实施例中,进一步的,D2D SPS资源信息还包括SPS指示符,SPS指示符用于指示D2D SPS资源信息包括D2D SPS资源和D2D SPS有效期。
本发明实施例中,可选的,D2D SPS资源信息还包括SPS周期,SPS周期用于指示第一终端能够重复使用D2D SPS资源的时间间隔。
本发明实施例中,进一步的,处理单元50还用于,确定第一终端的D2D通信数据生成周期、SC周期;并根据D2D通信数据生成周期和SC周期,确定SPS周期。
本发明实施例中,可选的,处理单元50将D2D SPS资源信息发送至第一终端时,具体为:
将下行控制信息DCI发送至第一终端,DCI携带D2D SPS资源信息。
本发明实施例中,进一步的,还包括接收单元52,用于接收ProSe功能实体发送的层2标识,层2标识用于第一终端与第二终端进行一对一D2D通信的一对D2D通信终端;
发送单元51还用于,将层2标识转发至第一终端、第二终端。
参阅图5B所示,本发明实施例中,提出一种基站的示意图,该基站包括处理器500、发送器510,其中:
处理器500,用于确定设备到设备D2D半静态调度SPS资源信息,D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,D2D SPS有效期是指第一终端能够使用D2D SPS资源的时长,D2D SPS有效期大于一个D2D链路控制SC周期;
发送器510,用于将D2D SPS资源信息发送至第一终端。
需要说明的是,处理器500还用于执行处理单元50所执行的其他操作,发送器510还用于执行发送单元51所执行的其他操作,还包括接收器520,用于执行接收单元52所执行的操作。
参阅图6A所示,本发明实施例中,提出一种第一终端的示意图,该第一终端包括处理单元60和发送单元61,其中:
处理单元60,用于确定设备到设备D2D半静态调度SPS资源信息,D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,D2D SPS有效期是指第一终端能够使用D2D SPS资源的时长,D2D SPS有效期大于一个D2D链路控制SC周期;
发送单元61,用于在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息。
本发明实施例中,进一步的,D2D SPS资源信息还包括SPS指示符,SPS指示符用于指示D2D SPS资源信息包括D2D SPS资源和D2D SPS有效期;
处理单元60确定设备到设备D2D半静态调度SPS资源信息时,具体为:
根据SPS指示符,确定D2D SPS资源信息包括D2D SPS资源和D2D SPS
有效期。
本发明实施例中,进一步的,D2D SPS资源信息还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔;
发送单元61在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息时,具体为:
在D2D SPS有效期内,采用SPS周期在D2D SPS资源上向第二终端发送信息。
本发明实施例中,可选的,SPS周期与D2D通信数据生成周期和SC周期相关。
本发明实施例中,进一步的,发送单元61还用于,向ProSe实体发送D2D通信请求;
还包括接收单元62,用于接收ProSe实体通过基站发送的层2标识;或者
处理单元60还用于,从预设的至少一个层2标识中选择一个层2标识,作为层2标识,专用层2标识用于第一终端与第二终端进行一对一D2D通信的一对D2D通信终端。
本发明实施例中,进一步的,还包括接收单元62,用于接收基站发送的D2D SPS资源信息。
本发明实施例中,可选的,处理单元60确定D2D SPS资源信息时,具体为:
采用自由竞争的方式确定D2D SPS资源信息。
本发明实施例中,进一步的,处理单元60还用于,启动定时器;
发送单元61还用于,在处理单元60确定定时器超时前,在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息。
本发明实施例中,进一步的,处理单元60还用于,在确定定时器超时时,释放D2D SPS资源。
本发明实施例中,可选的,D2D SPS资源信息包括SC资源和D2D SPS
数据资源,信息包括SCI和D2D通信数据;
SCI包括D2D SPS数据资源SPS剩余时限,SPS剩余时限表示从当前SC周期开始,D2D SPS资源的剩余有效时间,SPS剩余时限大于一个SC周期;
发送单元61在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息时,具体为:
在SPS剩余时限内,在SC资源上向第二终端发送SCI,在D2D SPS数据资源上向第二终端发送D2D通信数据。
本发明实施例中,进一步的,SCI还包括SCI指示符,SCI指示符用于指示SCI包括D2D SPS数据资源和SPS剩余时限。
本发明实施例中,进一步的,SCI还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔;
发送单元61在SPS剩余时限内,在SC资源上向第二终端发送SCI,在D2D SPS数据资源上向第二终端发送D2D通信数据时,具体为:
在SPS剩余时限内,在SC资源上向第二终端发送SCI,并采用SPS周期,周期性的在D2D SPS数据资源上向第二终端发送D2D通信数据。
参阅图6B所示,本发明实施例中,提出一种终端设备的示意图,该终端设备包括处理器600和发送器610,其中:
处理器600,用于确定设备到设备D2D半静态调度SPS资源信息,D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,D2D SPS有效期是指第一终端能够使用D2D SPS资源的时长,D2D SPS有效期大于一个D2D链路控制SC周期;
发送器610,用于在D2D SPS有效期内在D2D SPS资源上向第二终端发送信息。
需要说明的是,处理器600还用于执行处理单元60所执行的其他操作,发送器610还用于执行发送单元61所执行的其他操作,还包括接收器620,用于执行接收单元62所执行的操作。
参阅图7A所示,本发明实施例中,提出一种第二终端,该第二终端包括
处理单元70和接收单元71,其中:
处理单元70,用于解码第一终端发送的设备到设备D2D链路控制信息SCI,SCI包括第一终端能够使用的D2D通信资源池中能够采用的D2D半静态调度SPS数据资源、SPS剩余时限,SPS剩余时限表示从当前SC周期开始,D2D SPS资源的剩余有效时间,SPS剩余时限大于一个SC周期;
接收单元71,用于在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据。
本发明实施例中,进一步的,D2D SPS资源信息还包括SPS指示符,SCI指示符用于指示SCI包括D2D SPS数据资源和SPS剩余时限;
处理单元70还用于,根据SCI指示符确定SCI包括D2D SPS数据资源和SPS剩余时限。
本发明实施例中,进一步的,SCI还包括SPS周期,SPS周期是指第一终端能够重复使用D2D SPS资源的时间间隔;
接收单元71在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据时,具体为:
在SPS剩余时限内,采用SPS周期,周期性的在D2D SPS数据资源上接收第一终端发送的D2D通信数据。
本发明实施例中,可选的,SPS周期与D2D通信数据生成周期和SC周期相关。
本发明实施例中,可选的,SCI携带层2标识的M个比特位、D2D通信数据携带层2标识的N个比特位,层2标识用于标识第一终端与第二终端为进行一对一D2D通信的一组D2D通信组,M个比特位与N个比特位之和等于层2标识的全部比特位;
处理单元70还用于,从SCI中获取层2标识的M个比特位;
接收单元71还用于,接收媒体接入控制MAC数据包;
处理单元70还用于,从接收单元71接收到的MAC数据包中获取层2标识的N个比特位;并确定从SCI中获取层2标识的M个比特位,和从层2
标识的N个比特位组合得到的层2标识,与存储的层2标识相同。
本发明实施例中,进一步的,接收单元71还用于,接收基站发送的层2标识,层2标识用于第一终端与第二终端进行一对一D2D通信的一对D2D通信终端。
本发明实施例中,进一步的,处理单元70还用于,启动定时器;
接收单元71在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据时,具体为:
在处理单元70确定定时器未超时时,在SPS剩余时限内,在D2D SPS资源上接收第一终端发送的D2D通信数据。
参阅图7B所示,本发明实施例中,提出一种第二终端的示意图,该第二终端包括处理器700、接收器710,其中:
处理器700用于解码第一终端发送的设备到设备D2D链路控制信息SCI,SCI包括第一终端能够使用的D2D通信资源池中能够采用的D2D半静态调度SPS数据资源、SPS剩余时限,SPS剩余时限表示从当前SC周期开始,D2D SPS资源的剩余有效时间,SPS剩余时限大于一个SC周期;
接收器710,用于在SPS剩余时限内,在D2D SPS数据资源上接收第一终端发送的D2D通信数据。
需要说明的是,处理器700还用于执行处理单元70所执行的其他操作,接收器710还用于执行接收单元71所执行的其他操作。
本发明实施例中,还提出一种通信系统,包括如图5A或者图5B所示的基站、如图6A或者图6B所示的第一终端,及如图7A或者图7B所示的第二终端。
本领域内的技术人员应明白,本发明的实施例可提供为方法、系统、或计算机程序产品。因此,本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例做出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然,本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样,倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。
Claims (51)
- 一种通信方法,其特征在于,包括:基站确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;所述基站将所述D2D SPS资源信息发送至所述第一终端。
- 如权利要求1所述的方法,其特征在于,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
- 如权利要求1或2所述的方法,其特征在于,所述D2D SPS资源信息还包括SPS周期,所述SPS周期用于指示所述第一终端能够重复使用所述D2D SPS资源的时间间隔。
- 如权利要求3所述的方法,其特征在于,基站确定所述D2D SPS资源信息之前,还包括:所述基站确定所述第一终端的D2D通信数据生成周期、SC周期;所述基站根据所述D2D通信数据生成周期和所述SC周期,确定所述SPS周期。
- 如权利要求1-4任一项所述的方法,其特征在于,所述基站将所述D2D SPS资源信息发送至所述第一终端,包括:所述基站将下行控制信息DCI发送至所述第一终端,所述DCI携带所述D2D SPS资源信息。
- 如权利要求1-5任一项所述的方法,其特征在于,所述基站将所述D2D SPS资源信息发送至所述第一终端之前,还包括:所述基站接收ProSe功能实体发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端;所述基站将所述层2标识转发至所述第一终端、所述第二终端。
- 一种通信方法,其特征在于,包括:第一终端确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
- 如权利要求7所述的方法,其特征在于,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期;第一终端确定设备到设备D2D半静态调度SPS资源信息,包括:所述第一终端根据所述SPS指示符,确定所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
- 如权利要求7或8所述的方法,其特征在于,所述D2D SPS资源信息还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息,包括:所述第一终端在所述D2D SPS有效期内,采用所述SPS周期在所述D2D SPS资源上向第二终端发送信息。
- 如权利要求9所述的方法,其特征在于,所述SPS周期与D2D通信数据生成周期和SC周期相关。
- 如权利要求7-10任一项所述的方法,其特征在于,所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息之前,还包括:所述第一终端向ProSe实体发送D2D通信请求,并接收所述ProSe实体通过基站发送的所述层2标识;或者所述第一终端从预设的至少一个层2标识中选择一个层2标识,作为所述层2标识,所述专用层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
- 如权利要求7-11任一项所述的方法,其特征在于,第一终端确定D2D SPS资源信息,包括:所述第一终端接收基站发送的所述D2D SPS资源信息。
- 如权利要求7-11任一项所述的方法,其特征在于,第一终端确定D2D SPS资源信息,包括:所述第一终端采用自由竞争的方式确定所述D2D SPS资源信息。
- 如权利要求13所述的方法,其特征在于,第一终端确定D2D SPS资源信息之后,还包括:所述第一终端启动定时器;所述第一终端在所述定时器超时前,在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
- 如权利要求14所述的方法,其特征在于,所述方法还包括:所述第一终端确定所述定时器超时时,释放所述D2D SPS资源。
- 如权利要求7-15任一项所述的方法,其特征在于,所述D2D SPS资源信息包括SC资源和D2D SPS数据资源,所述信息包括SCI和D2D通信数据;所述SCI包括所述D2D SPS数据资源SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;所述第一终端在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息,包括:所述第一终端在所述SPS剩余时限内,在所述SC资源上向所述第二终端 发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
- 如权利要求7-16任一项所述的方法,其特征在于,所述SCI还包括SCI指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
- 如权利要求16或17所述的方法,其特征在于,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;所述第一终端在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据,包括:所述第一终端在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,并采用所述SPS周期,周期性的在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
- 一种通信方法,其特征在于,包括:第二终端解码第一终端发送的设备到设备D2D链路控制信息SCI,所述SCI包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D半静态调度SPS数据资源、SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
- 如权利要求19所述的方法,其特征在于,所述D2D SPS资源信息还包括SPS指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限;所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据之前,还包括:所述第二终端根据所述SCI指示符确定所述SCI包括所述D2D SPS数据 资源和所述SPS剩余时限。
- 如权利要求19或20所述的方法,其特征在于,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据,包括:所述第二终端在所述SPS剩余时限内,采用所述SPS周期,周期性的在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
- 如权利要求21所述的方法,其特征在于,所述SPS周期与D2D通信数据生成周期和SC周期相关。
- 如权利要求19-22任一项所述的方法,其特征在于,所述SCI携带层2标识的M个比特位、所述D2D通信数据携带层2标识的N个比特位,所述层2标识用于标识所述第一终端与所述第二终端为进行一对一D2D通信的一组D2D通信组,所述M个比特位与所述N个比特位之和等于所述层2标识的全部比特位;所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据之前,还包括:所述第二终端从所述SCI中获取所述层2标识的M个比特位;所述第二终端接收媒体接入控制MAC数据包,并从MAC数据包中获取所述层2标识的N个比特位;所述第二终端确定从所述SCI中获取所述层2标识的M个比特位,和从所述层2标识的N个比特位组合得到的层2标识,与存储的层2标识相同。
- 如权利要求19-23任一项所述的方法,其特征在于,所述第二终端在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据之前,还包括:所述第二终端接收基站发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
- 如权利要求19-24任一项所述的方法,其特征在于,所述第二终端接收第一终端发送的SCI之后,还包括:所述第二终端启动定时器;所述第二终端在SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据,包括:所述第二终端在所述定时器未超时时,在SPS剩余时限内,在所述D2D SPS资源上接收所述第一终端发送的D2D通信数据。
- 一种基站,其特征在于,包括:处理单元,用于确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;发送单元,用于将所述D2D SPS资源信息发送至所述第一终端。
- 如权利要求26所述的基站,其特征在于,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
- 如权利要求26或27所述的基站,其特征在于,所述D2D SPS资源信息还包括SPS周期,所述SPS周期用于指示所述第一终端能够重复使用所述D2D SPS资源的时间间隔。
- 如权利要求28所述的基站,其特征在于,所述处理单元还用于,确定所述第一终端的D2D通信数据生成周期、SC周期;并根据所述D2D通信数据生成周期和所述SC周期,确定所述SPS周期。
- 如权利要求26-29任一项所述的基站,其特征在于,所述处理单元将所述D2D SPS资源信息发送至所述第一终端时,具体为:将下行控制信息DCI发送至所述第一终端,所述DCI携带所述D2D SPS资源信息。
- 如权利要求26-30任一项所述的基站,其特征在于,还包括接收单元,用于接收ProSe功能实体发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端;所述发送单元还用于,将所述层2标识转发至所述第一终端、所述第二终端。
- 一种第一终端,其特征在于,包括:处理单元,用于确定设备到设备D2D半静态调度SPS资源信息,所述D2D SPS资源信息包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D SPS资源、D2D SPS有效期,所述D2D SPS有效期是指所述第一终端能够使用所述D2D SPS资源的时长,所述D2D SPS有效期大于一个D2D链路控制SC周期;发送单元,用于在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
- 如权利要求32所述的第一终端,其特征在于,所述D2D SPS资源信息还包括SPS指示符,所述SPS指示符用于指示所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期;所述处理单元确定设备到设备D2D半静态调度SPS资源信息时,具体为:根据所述SPS指示符,确定所述D2D SPS资源信息包括所述D2D SPS资源和所述D2D SPS有效期。
- 如权利要求32或33所述的第一终端,其特征在于,所述D2D SPS资源信息还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;所述发送单元在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息时,具体为:在所述D2D SPS有效期内,采用所述SPS周期在所述D2D SPS资源上向第二终端发送信息。
- 如权利要求34所述的第一终端,其特征在于,所述SPS周期与D2D通信数据生成周期和SC周期相关。
- 如权利要求32-35任一项所述的第一终端,其特征在于,所述发送单元还用于,向ProSe实体发送D2D通信请求;还包括接收单元,用于接收所述ProSe实体通过基站发送的所述层2标识;或者所述处理单元还用于,从预设的至少一个层2标识中选择一个层2标识,作为所述层2标识,所述专用层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
- 如权利要求32-36任一项所述的第一终端,其特征在于,还包括接收单元,用于接收基站发送的所述D2D SPS资源信息。
- 如权利要求32-36任一项所述的第一终端,其特征在于,所述处理单元确定D2D SPS资源信息时,具体为:采用自由竞争的方式确定所述D2D SPS资源信息。
- 如权利要求38所述的第一终端,其特征在于,所述处理单元还用于,启动定时器;所述发送单元还用于,在所述处理单元确定所述定时器超时前,在所述D2D SPS有效期内在所述D2D SPS资源上向第二终端发送信息。
- 如权利要求39所述的第一终端,其特征在于,所述处理单元还用于,在确定所述定时器超时时,释放所述D2D SPS资源。
- 如权利要求32-40任一项所述的第一终端,其特征在于,所述D2D SPS资源信息包括SC资源和D2D SPS数据资源,所述信息包括SCI和D2D通信数据;所述SCI包括所述D2D SPS数据资源SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;所述发送单元在所述D2D SPS有效期内在所述D2D SPS资源上向第二终 端发送信息时,具体为:在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
- 如权利要求32-41任一项所述的第一终端,其特征在于,所述SCI还包括SCI指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
- 如权利要求41或42所述的第一终端,其特征在于,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;所述发送单元在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,在所述D2D SPS数据资源上向第二终端发送D2D通信数据时,具体为:在所述SPS剩余时限内,在所述SC资源上向所述第二终端发送所述SCI,并采用所述SPS周期,周期性的在所述D2D SPS数据资源上向第二终端发送D2D通信数据。
- 一种第二终端,其特征在于,包括:处理单元,用于解码第一终端发送的设备到设备D2D链路控制信息SCI,所述SCI包括所述第一终端能够使用的D2D通信资源池中能够采用的D2D半静态调度SPS数据资源、SPS剩余时限,所述SPS剩余时限表示从当前SC周期开始,所述D2D SPS资源的剩余有效时间,所述SPS剩余时限大于所述一个SC周期;接收单元,用于在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
- 如权利要求44所述的第二终端,其特征在于,所述D2D SPS资源信息还包括SPS指示符,所述SCI指示符用于指示所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限;所述处理单元还用于,根据所述SCI指示符确定所述SCI包括所述D2D SPS数据资源和所述SPS剩余时限。
- 如权利要求44或45所述的第二终端,其特征在于,所述SCI还包括SPS周期,所述SPS周期是指所述第一终端能够重复使用所述D2D SPS资源的时间间隔;所述接收单元在所述SPS剩余时限内,在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据时,具体为:在所述SPS剩余时限内,采用所述SPS周期,周期性的在所述D2D SPS数据资源上接收所述第一终端发送的D2D通信数据。
- 如权利要求46所述的第二终端,其特征在于,所述SPS周期与D2D通信数据生成周期和SC周期相关。
- 如权利要求44-47任一项所述的第二终端,其特征在于,所述SCI携带层2标识的M个比特位、所述D2D通信数据携带层2标识的N个比特位,所述层2标识用于标识所述第一终端与所述第二终端为进行一对一D2D通信的一组D2D通信组,所述M个比特位与所述N个比特位之和等于所述层2标识的全部比特位;所述处理单元还用于,从所述SCI中获取所述层2标识的M个比特位;所述接收单元还用于,接收媒体接入控制MAC数据包;所述处理单元还用于,从所述接收单元接收到的MAC数据包中获取所述层2标识的N个比特位;并确定从所述SCI中获取所述层2标识的M个比特位,和从所述层2标识的N个比特位组合得到的层2标识,与存储的层2标识相同。
- 如权利要求44-48任一项所述的第二终端,其特征在于,所述接收单元还用于,接收基站发送的层2标识,所述层2标识用于所述第一终端与所述第二终端进行一对一D2D通信的一对D2D通信终端。
- 如权利要求44-49任一项所述的第二终端,其特征在于,所述处理单元还用于,启动定时器;所述接收单元在SPS剩余时限内,在所述D2D SPS数据资源上接收所述 第一终端发送的D2D通信数据时,具体为:在所述处理单元确定所述定时器未超时时,在SPS剩余时限内,在所述D2D SPS资源上接收所述第一终端发送的D2D通信数据。
- 一种通信系统,其特征在于,包括如权利要求25至31任意一项所述的基站、如权利要求32-43任意一项所述的第一终端,及如权利要求44-50任意一项所述的第二终端。
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Also Published As
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| US10939462B2 (en) | 2021-03-02 |
| CN110839226A (zh) | 2020-02-25 |
| JP2018534865A (ja) | 2018-11-22 |
| EP3346744A4 (en) | 2018-10-10 |
| EP3346744B1 (en) | 2021-03-03 |
| CN107005851A (zh) | 2017-08-01 |
| CN110839226B (zh) | 2022-01-11 |
| US20180227943A1 (en) | 2018-08-09 |
| EP3346744A1 (en) | 2018-07-11 |
| US20200084795A1 (en) | 2020-03-12 |
| US10492218B2 (en) | 2019-11-26 |
| CN107005851B (zh) | 2019-11-12 |
| JP6636146B2 (ja) | 2020-01-29 |
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