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WO2016111505A1 - Procédé et appareil pour ajuster dynamiquement un ccat dans système de communication en champ proche - Google Patents

Procédé et appareil pour ajuster dynamiquement un ccat dans système de communication en champ proche Download PDF

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Publication number
WO2016111505A1
WO2016111505A1 PCT/KR2016/000004 KR2016000004W WO2016111505A1 WO 2016111505 A1 WO2016111505 A1 WO 2016111505A1 KR 2016000004 W KR2016000004 W KR 2016000004W WO 2016111505 A1 WO2016111505 A1 WO 2016111505A1
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WIPO (PCT)
Prior art keywords
ccat
frame
ccatcur
transmission
retry
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Ceased
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PCT/KR2016/000004
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English (en)
Korean (ko)
Inventor
김이고르
강현덕
고광진
송명선
오진형
최재익
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority claimed from KR1020150178073A external-priority patent/KR20160084291A/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Publication of WO2016111505A1 publication Critical patent/WO2016111505A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a channel access method and apparatus in a short range wireless communication system, and more particularly, to a method and apparatus for dynamically adjusting a CCA threshold (CCAT) in a short range wireless communication system.
  • CCAT CCA threshold
  • a station In general, in a short range wireless transmission system, a station (STA) must perform a clear channel assessment (CCA), which is a 7 mechanism used to determine the state of a channel before accessing the channel. The channel may be busy or idle due to transmission or collision of another station (STA).
  • Carrier sense (CS) includes PCS (Physical Carrier Sense) and VCS (Virtual Carrier Sense).
  • the transmitter and the receiver exchange Request To Send (RTS) and Clear To Send (CTS) for medium reservation before actual data transmission.
  • RTS Request To Send
  • CTS Clear To Send
  • NAV Network Allocation Vector
  • PCS is the receiver's ability to detect and decode the preamble of a radio frame.
  • the receiver sets a CCA Threshold (CCAT). If the received signal level is greater than CCAT, the medium is in use.
  • CCAT is fixed at a preset value and does not change. This can result in severe resource underutilization and poor spatial reuse.
  • FIG. 1 is a diagram for describing a general scenario according to three access points (APs) and stations (STAs) distributed in respective cells. An example of a scenario with improved space reuse when CCAT is adjusted is described.
  • CCAT of AP1 is set to CCAT 1 covering the STA2 and STA3 with the PCS range of R1.
  • STA2 and STA3 are associated with AP2 and SP3, respectively. If STA2 or STA3 transmits data to their respective serving APs, it means that AP1 will not interfere with ongoing transmissions from STA2 or STA3, but meanwhile it is in a state where it cannot transmit data.
  • This problem is generally related to the exposed node problem.
  • AP1 is exposed, and this exposure causes severe performance degradation.
  • the streams at STA1 and STA6 may experience long delays.
  • the PCS range of R1 significantly reduces the aggregate capacity of such an exemplary network.
  • AP1 updates the CCAT value to CCAT 2 (CCAT 2 > CCAT 1 )
  • the PCS range shrinks to R2, which is enough to allow simultaneous transmission from AP1 and STA2 / STA3 in each cell.
  • CCAT updates can significantly improve the space reuse of such networks and increase their utilization. Simultaneous transmission of STA3 or STA2 is still received at AP1, but AP1 ignores this because the power level of the signals is lower than CCAT 2 . However, AP1 treats these signals as interference. This increases the tradeoff between space reuse improvement and the amount of interference. Dynamic CCAT coordination algorithms are needed to counter this tradeoff.
  • the present invention has been made to solve the above-described problem, and an object of the present invention is to provide more intelligent carrier sensing in a short range wireless communication system operating in an infrastructure and ad hoc mode.
  • the present invention provides a method and apparatus for dynamically adjusting CCA Threshold (CCAT) in wireless nodes to increase space reuse and overall network efficiency.
  • CCAT CCA Threshold
  • a dynamic clear channel assessment threshold (CCAT) adjustment method in a station and an access point for short-range wireless communication for achieving the above object, trial frame or regular frame Determining a type of a transmission target frame with any one of; Setting a CCAT retry sequence including a sequence of CCAT and a retry number according to the determined type of the transmission target frame; And controlling transmission of the transmission target frame according to the CCAT retry sequence.
  • CCAT dynamic clear channel assessment threshold
  • the transmission ratio between the trial frame and the regular frame is preset to n: m, where n ⁇ m (n, m is a real number).
  • the setting of the CCAT retry sequence includes setting the CCAT within a predetermined range from a predetermined current optimal CCAT (CCATcur).
  • the CCATcur is updated based on statistics of successful and failed transmissions for each CCAT value and statistics on channel access time. It further comprises the step.
  • the updating of the CCATcur includes updating a Carrier Sense (CS) window having lower and upper boundaries for the CCAT about the updated CCATcur.
  • CS Carrier Sense
  • the type of the transmission target frame is determined, the CCAT retry sequence is set, and the transmission of the transmission target frame is controlled.
  • the setting of the CCAT retry sequence may include randomly selecting a trial frame from a CS (Carrier Sense) window having a lower boundary (CCATlow) and an upper boundary (CCATup) about a current optimal CCAT (CCATcur). And determining the CCAT retry sequence including the number of retries for each frame transmission in the order of CCATrand, CCATcur, and CCATlow when the value CCATrand is greater than the CCATcur.
  • CS Carrier Sense
  • CCATup Current optimal CCAT
  • the setting of the CCAT retry sequence may include randomly selecting a trial frame from a CS (Carrier Sense) window having a lower boundary (CCATlow) and an upper boundary (CCATup) about a current optimal CCAT (CCATcur). And determining the CCAT retry sequence including the number of retries of each frame transmission in the order of the CCATcur, the CCATrand, and the CCATlow when the value CCATrand is selected as the CCATcur or less than the CCATcur.
  • CS Carrier Sense
  • CCATup Current optimal CCAT
  • the CCATcur, CCATnext and CCATlow order respectively, based on a CS (Carrier Sense) window having a lower boundary (CCATlow) and an upper boundary (CCATup) around a current optimal CCAT (CCATcur). Determining the CCAT retry sequence including the retry number of frame transmissions, wherein the CCATnext is a CCAT that achieves the highest throughput in retransmission after the CCATcur.
  • CS Carrier Sense
  • CCATup Current optimal CCAT
  • the dynamic clear channel assessment threshold (CCAT) adjusting device in a station and an access point for short-range wireless communication includes a frame transmission manager for determining a type of a transmission target frame as either a trial frame or a regular frame. ; And a physical carrier sensing manager configured to set a CCAT retry sequence including a CCAT and a retry number sequence according to the determined type of the transmission target frame, wherein the frame transmission manager is configured to transmit the CCAT retry sequence according to the CCAT retry sequence. It is characterized by controlling the transmission of the target frame.
  • the transmission ratio between the trial frame and the regular frame is preset to n: m, where n ⁇ m (n, m is a real number).
  • the physical carrier sensing manager may set the CCAT within a predetermined range from a predetermined current optimal CCAT (CCATcur).
  • the dynamic CCAT adjusting device updates the CCATcur based on statistics of channel access time and statistics of successful and failed transmission for each CCAT value. It further includes a channel access manager.
  • the channel access manager updates a carrier sense window (CS) having lower and upper boundaries for the CCAT around the updated CCATcur.
  • CS carrier sense window
  • the type of the transmission target frame is determined, the CCAT retry sequence is set, and the transmission of the transmission target frame is controlled.
  • the physical carrier sensing manager randomly selects CCAT for the trial frame from a CS (Carrier Sense) window having a lower boundary (CCATlow) and an upper boundary (CCATup) around a current optimal CCAT (CCATcur).
  • CS Carrier Sense
  • CCATup Current optimal CCAT
  • the physical carrier sensing manager randomly selects CCAT for the trial frame from a CS (Carrier Sense) window having a lower boundary (CCATlow) and an upper boundary (CCATup) around a current optimal CCAT (CCATcur).
  • CCATrand Carrier Sense
  • CCATup Current optimal CCAT
  • the CCAT retry sequence including the number of retries of each frame transmission may be determined in the order of the CCATcur, the CCATrand, and the CCATlow.
  • the physical carrier sensing manager based on the CS (Carrier Sense) window having a lower boundary (CCATlow) and an upper boundary (CCATup) around the current optimal CCAT (CCATcur), the CCATcur, CCATnext And the CCAT retry sequence including the retry number of each frame transmission in the CCATlow order, wherein the CCATnext may be a CCAT that achieves the highest throughput in retransmission after the CCATcur.
  • CCA Threshold (CCAT) dynamic adjustment method and apparatus in the wireless nodes of the short-range wireless communication system according to the present invention, more intelligent carrier sensing can increase space reuse and overall network efficiency. By allowing data transmission of potentially exposed nodes even when interfering transmissions are in progress, it is possible to alleviate exposed node problems and significantly increase overall network utilization and performance.
  • FIG. 1 is a diagram for describing a general scenario according to three access points (APs) and stations (STAs) distributed in respective cells.
  • APs access points
  • STAs stations
  • FIG. 2 is a block diagram illustrating a CCAT dynamic adjustment device according to an embodiment of the present invention.
  • CS carrier sense
  • FIG. 4 is a flowchart illustrating a concept of a CCAT adjustment method in a CCAT dynamic adjustment device according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of analyzing a CCAT retry sequence for a trial frame in a CCAT dynamic adjustment device according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of analyzing a CCAT retry sequence for a regular frame in a CCAT dynamic adjustment device according to an embodiment of the present invention.
  • FIG. 7 is a view for explaining an example of an implementation method of a CCAT dynamic adjustment device according to an embodiment of the present invention.
  • a station is a physical layer (media) for the medium access control (MAC) and the wireless medium (medium) conforming to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. layer) Any functional medium that includes an interface.
  • the station STA may include a processor and a transceiver, and may further include a user interface and a display device.
  • a processor refers to a unit designed to generate a frame to be transmitted through a wireless network or to process a frame received through a wireless network, and performs various functions for controlling a station (STA).
  • a transceiver is a unit that is functionally connected to a processor and is designed to transmit and receive a frame through a wireless network for a station (STA).
  • a station includes a wireless transmit / receive unit (WTRU), a user equipment (UE), a user terminal (UT), an access terminal (AT), a mobile station , MS), a mobile terminal, a subscriber unit, a subscriber station (SS), a wireless device, a mobile subscriber unit, etc., It may include some or all of them.
  • the terminal may be, for example, a desktop computer, a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone that can communicate with each other.
  • Smart watch smart glass, e-book reader, portable multimedia player (PMP), portable game console, navigation device, digital camera, digital multimedia broadcasting (DMB) Player, digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video recorder, digital video player It may include an electronic device capable of wireless communication such as a digital video player.
  • PMP portable multimedia player
  • DMB digital multimedia broadcasting
  • the access point (AP) is a centralized controller, a base station (BS), a radio access station, a node B, a node B, an evolved node B, an MMR ( may refer to a mobile multihop relay (BS) -BS, a base transceiver system (BTS), a site controller, or the like, and may include some or all of their functions.
  • BS base station
  • BTS base transceiver system
  • FIG. 2 is a block diagram illustrating a CCAT dynamic adjustment device 100 according to an embodiment of the present invention.
  • the CCAT dynamic adjustment device 100 may be provided in an access point (AP).
  • AP access point
  • the CCAT dynamic adjustment device 100 includes a channel access manager 110, a physical carrier sensing manager 120, and It includes a frame transmission manager (130).
  • the channel access manager 110 is a main functional block for controlling the operation of the Clear Channel Assessment (CCA) Threshold (CCAT) dynamic adjustment algorithm of the present invention.
  • the channel access manager 110 is connected to the physical carrier sensing manager 120 and the frame transmission manager 130 through an appropriate interface.
  • the physical carrier sensing manager 120 and the frame transmission manager 130 are connected through an appropriate interface, and the frame transmission manager 130 interacts with the physical carrier sensing manager 120 with respect to the type of frame currently being transmitted.
  • the physical carrier sensing manager 120 generates a CCAT retry sequence.
  • the frame transmission manager 130 controls data frame transmission and retransmission according to the CCAT retry sequence.
  • frames transmitted through a transmitter under the control of the frame transmission manager 130 are classified into a trial frame for a CCAT test and a regular frame for normal data transmission.
  • the main purpose of trial frames is to test different CCAT values that can potentially improve performance.
  • Regular frames and trial frames are transmitted using different CCAT settings. Since the number of trial frames transmitted during the update interval T u should be less than the number of regular frames to prevent performance attenuation due to frequent CCAT adjustments, the transmission ratio between trial frames and regular frames is n: m It is preset to n ⁇ m where n and m are real.
  • the frame transmission manager 130 interacts with the physical carrier sensing manager 120 in relation to the type of frame currently being transmitted. It is also assumed that the same data frame can be transmitted with different CCAT values. To this end, the physical carrier sensing manager 120 generates a CCAT retry sequence including a sequence of CCAT and a retry number. Retransmission of data frames in different CCATs helps to ensure that the CCATs are optimal.
  • the channel access manager 110 may determine the frame transmission success probability based on the statistics of successful and unsuccessful transmissions for each CCAT value and channel access time based on reception of ACK frames received through a receiver. The channel access delay and the like can be analyzed based on the statistics. Based on this, the channel access manager 110 estimates the theoretically achievable throughput, and theoretically selects the CCAT having the maximum throughput as the CCATcur (current optimal CCAT) for the next update interval T u .
  • the receiver sets the CCAT to detect and decode the preamble of the radio frame. If the signal level received from the receiver is greater than CCAT, the medium is in use. If the signal level to be received is less than CCAT, the ACK frame is not received. As shown in FIG. 1, setting a larger CCAT reduces coverage, and setting a smaller CCAT increases coverage. That is, CCAT is the basis of the signal level that can be received by the receiver.
  • the channel access manager 110 may perform CS window sliding in the following manner.
  • parameter d represents the minimum value at which the CCAT can be updated.
  • CCATmin and CCATmax represent possible minimum and maximum values of CCAT values.
  • CCATlow and CCATup represent the lower and upper bounds of the CS window.
  • the CS window size W is set to 4d, for example.
  • CCATcur is placed in the center of the CS window and represents the current optimal threshold.
  • the CS window moves down (small) or top (high) so that the updated new CCATcur is centered in the CS window. Move (slid).
  • the CS window may approach CCATmin or CCATmax, where the CS window size W may be smaller than 4d.
  • FIG. 4 is a flowchart illustrating a concept of a CCAT adjustment method in the CCAT dynamic adjustment device 100 according to an embodiment of the present invention.
  • all tuning parameters are initially initialized to a predetermined initial value (S110).
  • Initial values of CCATcur and CCATlow are set to CCATmin.
  • the update interval T u is chosen at a predetermined value so that the algorithm can respond quickly to sudden network changes.
  • frame transmission manager 130 may determine what type of frame is to be transmitted based on the n: m ratio.
  • the physical carrier sensing manager 120 may set the CCAT retry sequence by selecting the CCAT as shown in FIG. 5 (S130) (S140).
  • the physical carrier sensing manager 120 may set a CCAT retry sequence as shown in FIG. 6 (S140).
  • a CCAT sequence is set in a predetermined range, that is, the CS window range, from the current optimal CCAT (CCATcur) predetermined in the previous update interval, and the number of retries for each CCAT is set. Set it.
  • FIG. 5 is a flowchart of resolving a CCAT retry sequence for a trial frame in the CCAT dynamic adjustment device 100 according to an embodiment of the present invention.
  • the transmission target frame is a trial frame (S120)
  • the transmission target frame is ready to transmit through the transmitter (Tx) (S210)
  • the physical carrier sensing manager 120 is random from the CS window [CCATlow, CCATup] To output the selected value (CCATrand) (S220).
  • the retry sequence of CCAT is different according to the selected value.
  • the physical carrier sensing manager 120 sets the CCAT retry sequence to ⁇ CCATrand (r1), CCATcur (r2), CCATlow (r3) ⁇ (S240). ).
  • CCAT is set to CCATrand before frame transmission. If the frame is still not delivered to the station STA within the first number of transmission attempts r1, the CCAT is set to CCATcur. If the frame is not delivered within the second number of transmission attempts r2, finally, the CCAT is set to CCATlow and the frame may be retransmitted at the third number of transmission attempts r3.
  • the retry numbers r1, r2, and r3 can be selected such that the sum of the values r1 + r2 + r3 is equal to the maximum retry limit (R).
  • the physical carrier sensing manager 120 sets the CCAT retry sequence to ⁇ CCATcur (r1), CCATrand (r2), CCATlow (r3) ⁇ (S250).
  • the retry sequence is set differently because setting CCATrand at the initial position for all trial frames can lead to suboptimal performance. For example, if the current CCAT setting is optimal, setting CCATrand smaller than CCATcur in the initial position for trial frames will cause unnecessary carrier sensing increase and performance reduction. Again, the same maximum retry limit (R) applies.
  • FIG. 6 is a flowchart of resolving a CCAT retry sequence for a regular frame in the CCAT dynamic adjustment device 100 according to an embodiment of the present invention.
  • the transmission target frame is a regular frame (S120)
  • the transmission target frame is ready to transmit through the transmitter (Tx) (S310)
  • the physical carrier sensing manager 120 the CCAT retry sequence ⁇ CCATcur ( r1), CCATnext (r2), and CCATlow (r3) ⁇ (S320).
  • CCATnext represents a CCAT in which a station (STA) achieves the highest throughput in retransmission after CCATcur.
  • the channel access manager 110 may determine the CCATnext based on statistics related to frame transmission and failure, channel access time, and the like. Again, the same maximum retry limit (R) applies.
  • the CCAT retry sequence is set for the frame as described above (S140), it is transmitted to the frame transmission manager 130.
  • the frame transmission manager 130 controls transmission and retransmission for the corresponding frame according to the CCAT retry sequence.
  • the channel access manager 110 collects and updates statistics of successful transmission and failed transmission for each CCAT values (S150). The decision about frame delivery is based on the reception of ACK frames. Frame error rate statistics are not used as the sole condition for whether or not CCAT is optimal. For example, in the case of an exposed node problem, an exposed node may achieve a low packet error rate but may exhibit low throughput performance due to frequent backoff. To estimate the theoretically possible throughput, channel access manager 110 records channel access time statistics. The channel access time is defined as the time interval from when the frame reaches the head of the transmission queue to the actual transmission.
  • the channel access manager 110 can estimate the theoretically achievable throughput. Accordingly, the channel access manager 110 may select the CCAT having the maximum theoretical throughput as the CCATcur for the next Tu (S170).
  • the CS window also slides by the same value when the newly updated CCATcur is increased or decreased. By sliding the range of possible CCATs, the channel access manager 110 can control to obtain the necessary statistics in real time and make intelligent selection of the most optimal CCAT under given conditions.
  • CCAT dynamic adjustment device 100 may be made of hardware, software, or a combination thereof.
  • the CCAT dynamic adjustment device 100 may be implemented with a computing system 1000 as shown in FIG. 7.
  • the computing system 1000 may include at least one processor 1100, a memory 1300, a user interface input device 1400, a user interface output device 1500, a storage 1600, and a network connected through a bus 1200. It may include an interface 1700.
  • the processor 1100 may be a central processing unit (CPU) or a semiconductor device that executes processing for instructions stored in the memory 1300 and / or the storage 1600.
  • the memory 1300 and the storage 1600 may include various types of volatile or nonvolatile storage media.
  • the memory 1300 may include a read only memory (ROM) 1310 and a random access memory (RAM) 1320.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, software module, or a combination of the two executed by the processor 1100.
  • the software module resides in a storage medium (ie, memory 1300 and / or storage 1600), such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, removable disks, CD-ROMs. You may.
  • An exemplary storage medium is coupled to the processor 1100, which can read information from and write information to the storage medium.
  • the storage medium may be integral to the processor 1100.
  • the processor and the storage medium may reside in an application specific integrated circuit (ASIC).
  • the ASIC may reside in a user terminal.
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • CCAT CCA Threshold

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

La présente invention concerne un procédé et un appareil pour ajuster de manière dynamique un seuil CCA (CCAT) dans des nœuds sans fil pour augmenter la réutilisation de l'espace et l'efficacité du réseau tout entier grâce à une détection plus intelligente de porteuse dans un système de communication en champ proche, et analogue, fonctionnant en modes infrastructure et ad hoc.
PCT/KR2016/000004 2015-01-05 2016-01-04 Procédé et appareil pour ajuster dynamiquement un ccat dans système de communication en champ proche Ceased WO2016111505A1 (fr)

Applications Claiming Priority (4)

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KR20150000455 2015-01-05
KR10-2015-0000455 2015-01-05
KR10-2015-0178073 2015-12-14
KR1020150178073A KR20160084291A (ko) 2015-01-05 2015-12-14 근거리 무선통신 시스템에서 동적 ｃｃａｔ 조정을 위한 방법 및 장치

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080008133A1 (en) * 2006-05-18 2008-01-10 Jing Zhu Adjustment of a clear channel assessment (CCA) threshold
KR20080113100A (ko) * 2006-04-13 2008-12-26 퀄컴 인코포레이티드 동적 캐리어 감지 임계치
KR20100006484A (ko) * 2008-07-09 2010-01-19 한국전자통신연구원 무선 네트워크의 ｐｃｓ 임계값조정방법 및 단말장치
WO2014027847A1 (fr) * 2012-08-16 2014-02-20 엘지전자 주식회사 Procédé et appareil d'accès à un canal dans un lan sans fil
KR20140055587A (ko) * 2012-10-31 2014-05-09 에스케이텔레콤 주식회사 네트워크제어장치 및 그 동작 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080113100A (ko) * 2006-04-13 2008-12-26 퀄컴 인코포레이티드 동적 캐리어 감지 임계치
US20080008133A1 (en) * 2006-05-18 2008-01-10 Jing Zhu Adjustment of a clear channel assessment (CCA) threshold
KR20100006484A (ko) * 2008-07-09 2010-01-19 한국전자통신연구원 무선 네트워크의 ｐｃｓ 임계값조정방법 및 단말장치
WO2014027847A1 (fr) * 2012-08-16 2014-02-20 엘지전자 주식회사 Procédé et appareil d'accès à un canal dans un lan sans fil
KR20140055587A (ko) * 2012-10-31 2014-05-09 에스케이텔레콤 주식회사 네트워크제어장치 및 그 동작 방법

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