WO2007115469A1 - Procédé de réduction de redondance d'échange d'information dans le réseau local sans fil de type 802.11 - Google Patents

Procédé de réduction de redondance d'échange d'information dans le réseau local sans fil de type 802.11 Download PDF

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Publication number
WO2007115469A1
WO2007115469A1 PCT/CN2007/000763 CN2007000763W WO2007115469A1 WO 2007115469 A1 WO2007115469 A1 WO 2007115469A1 CN 2007000763 W CN2007000763 W CN 2007000763W WO 2007115469 A1 WO2007115469 A1 WO 2007115469A1
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WIPO (PCT)
Prior art keywords
frame
mac
data
user terminal
uplink
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PCT/CN2007/000763
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English (en)
Chinese (zh)
Inventor
Yue Zhang
Linghuei Huang
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Zte Corporation
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Publication of WO2007115469A1 publication Critical patent/WO2007115469A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC

Definitions

  • the present invention belongs to the field of communications, and in particular, to a method for reducing the redundancy of information exchange between an AP and a non-AP user terminal in a WLAN system 802.11 system.
  • EDCA Extended Data Channel Access
  • HCCA Mixed Control Channel Access
  • Hybrid Control Channel Access which implements true polling.
  • the site receives eight egress queues that allocate data to the queue for transmission as needed. All waiting queues must be registered to the AP through the so-called Traffic Flow Specification (TSPEC).
  • TSPEC contains the "expected requirements" of the station to the waiting queue (minimum and maximum service interval, minimum transmission opportunity TX0P period).
  • the AP will return a so-called schedule containing the actual allocation of the waiting queue. This means that it may not meet the "expected requirements". For example, if the AP is overloaded and can no longer process more data streams, this requirement may even be completely rejected.
  • the HC should be responsible for processing the queuing of each site by polling. Since HCCA has absolute priority over EDCA, HC can actually be controlled at any time to handle demanding data flows (including data rate and synchronization requirements) in an appropriate manner. During this time, EDCA did not take effect and the corresponding data stream was not processed.
  • EDCA stations unlike HCCA stations, must be used in a hurry with the AP's polling schedule. To perform this function, the transmission terminals of each station have corresponding four waiting queues, and the data packets sent to the transmitting terminals can be classified. In addition, the rules for each site are: Clear the queues with higher priority and then process the queues with lower priority. As a standard category, "best effort" services can be coordinated with distributed collaborative DCFs. The background data stream has the lowest priority and is allowed to be transmitted only when the network is in an inactive state. As the name suggests, video and audio are the transmission of images and speech, and the specific needs of the network should be considered.
  • TX0P transmission opportunity
  • the series is especially beneficial.
  • the EDCA program is also called the reference
  • the quality of service is only a priority method within the scope of statistics. In other words, for a longer period of time, data streams with higher priority are also allocated to more bandwidth. For short time intervals, the rate of low priority data streams may also be faster than the medium priority data stream. EDCA does not provide sufficient security for rigorous simultaneous data streams or real-time applications.
  • the 802.11 protocol is not efficient.
  • the physical (PHY) header takes up 23 bytes (see Figure 2), which requires transmission at the lowest transmission rate (for the WLAN standard 802. lib, this rate It is 1 Mbps), and the MAC header has 30 bytes (see Figure 2). Its transmission rate is advertised by APs and non-AP user terminals. If we have compressed the RTP (Real Time Protocol) / UDP/IP header to 2 - 4 bytes according to RFC 2508, instead of 40 bytes for IPv4 and 60 bytes for IPv6.
  • RTP Real Time Protocol
  • the PHY header is allowed to replace the long preamble (192 microseconds) with a short preamble (96 microseconds) configuration, which only mitigates transmission efficiency issues, but It requires the entire system to operate at a minimum rate of 2 Mbps, which greatly affects system coverage. This shows that the 802.11 protocol does not have a good solution for packet transmission efficiency.
  • the invention improves the efficiency of voice packets or packet transmission by introducing centralized query and uplink time division multiple access techniques in the downlink.
  • the present invention adopts the following design scheme:
  • the small data packets to different user terminals form a sub-frame body, and then are concentrated into one super MAC downlink frame; in one sub-frame, the transmission opportunity of the corresponding user mid-end uplink TX0P Start time and length and a link identifier; all subframes share a PHY header; b) set each subframe to have its own CRC check code;
  • the uplink MAC frame contains the link identifier and the queue size of the user terminal; this queue size is defined by the total size of all packets that have not been sent by the user terminal;
  • BSSID basic service set identifier
  • BSS basic service set
  • the non-AP client may opt out of the mechanism or rejoin the mechanism according to the size and frequency of external interference.
  • the method of the present invention is mainly used for transmission of voice packets.
  • voice packets of different user terminals can be centralized to share PHY information headers and partial MAC information header control information.
  • the link identifier may be used to identify the destination and source address of the Medium Access Control (MAC).
  • the basic service set identifier (BSSID) or the link identifier the MAC destination address is used to transmit the XOR information, and the same sequence is XORed at the same end at the receiving end, and the CRC check code determines whether the decoding is performed. correct.
  • the fragmentation domain in the 802.11 MAC frame can be deleted during transmission.
  • each frame sent from the user terminal of the HC or non-AP contains a duration length field that has been made in the basic service set system. The user terminal resets their NAV to protect the immediately following frame. All user terminals will follow this HCF NAV rule.
  • source and destination MAC addresses can be identified by a short link identifier
  • the value of the queue size field of the uplink MAC frame is determined by the size of all packets or voice packets stored by the current non-AP client;
  • the uplink transmission opportunity TX0P limit of each non-AP user terminal in the downlink is determined by the size of the uplink queue reported by the user terminal to the AP and the resources remaining in the current system in the previous communication; e ) has a CRC check code. If the non-AP user terminal has been registered in the centralized query mode, if the super MAC frame is received, it will scan the entire frame and find the corresponding link identifier. If the CRC is passed, the subframe is removed and the subframe is removed. The uplink start time and the required length of time specified by the downlink subframe are set.
  • the Non-AP user terminal joining the mechanism combines the data or voice packets into a downlink subframe containing the CRC, and then uses the basic service set identifier to XOR the subframe to suppress the basic service set identifier, and can distinguish different The purpose of the basic service set (see Figure 5a).
  • the AP When the AP receives the uplink data, it will first use the basic service set identifier to XOR the sub-frame (see Figure 5b). If the CRC passes, it is considered correct.
  • the frame control word contains the number of subframes to help the AP obtain all the subframes of the user terminal.
  • This method can effectively transmit 802.11 voice packets or small data packets, which not only has high transmission efficiency, but also can increase 2-3 times voice capacity. '
  • Figure 1 is a modified frame control domain chart of the present invention
  • Figure 2 shows the structure of the existing 802. lib package.
  • FIG. 4 is a frame structure diagram of a super-downlink and an uplink frame in a centralized query mode according to the present invention
  • FIG. 5 - a) is a schematic diagram of an XOR process of a sub-frame of a super-window frame according to the present invention (at a user terminal)
  • bits 15 and 10 represent the number of subframes, which can represent up to 3 subframes.
  • a user terminal supporting centralized query and time division multiple access joins a basic service set (BSS) system, it needs to go through the following steps to reach a voice packet that can be transmitted: - a) It first determines the AP Whether centralized query and time division multiple access are supported, whether the B7 setting of the QoS information field in the Quality Service QoS Capability (AP) sent by the AP is 1, 1 means that the AP supports centralized query and time division multiple access mechanism.
  • AP Quality Service QoS Capability
  • the non-AP user terminal will send a Service Flow Join Request (ADDTS. request) to the AP if it discovers that the AP also supports this new mechanism through the QoS Capability Element.
  • ADDTS. request Service Flow Join Request
  • APs that support centralized query and time division multiple access will respond to a traffic flow join response (ADDTS. response) message.
  • ADDTS. response traffic flow join response
  • a reserved byte is used in the schedule element to pass the link.
  • logo information This modification can be more intuitive through Figure 3.b.
  • the link identifier flag 0—the centralized query and the time division multiple access method cannot be used; 1) The centralized query and the time division multiple access method are used, and the link identifier is immediately followed by 7 bits.
  • the AP If the AP considers the TSPEC to be a periodic small packet flow and the system has enough resources, the AP will send a link identifier to the non_AP user terminal. After AP ⁇ 1, this data stream is transmitted in the super MAC frame. The user terminal will remember this identifier for use in downlink demodulation and uplink modulation.
  • the AP will maintain multiple voice queues. Each queue has different 802.11 physical layer modulation and coding modes. If voice packets come in, the AP will be different according to the different physical layer modulation and coding modes of the corresponding user terminals. queue.
  • the HC will periodically query each queue (recommended 10ms - times). If the queue has a link identifier registered, it will form a super MAC frame. If the queue has a data packet, it will be placed in the downlink subframe. Otherwise, The downlink subframe has only the header and CRC containing the link identifier and the transmission opportunity TX0P, and each packet will constitute one subframe.
  • Figure 4 details the Super MAC frame structure. Each 802.11 physical layer modulation and coding scheme will correspond to a super MAC frame. The Super MAC frame will share a 2-byte frame control word, as indicated in Table 1 below for the upper and lower frame control words.
  • Type Value Type Description Type Subtype Value (Subtype Description) Subtype description
  • Control class 1100 can send (Clear To Send (CTS))
  • duration/identity (duration/ID) field. This duration length will include the uplink and downlink of the entire Super MAC frame to prevent other user terminals from competing for wireless media on the uplink.
  • This field is set to:
  • the number of all ⁇ - ⁇ user terminals in microseconds. Any one of the downlink subframes contains the duration and start time of the transmission opportunity TX0P of the non- ⁇ user terminal.
  • the start time of the winding can be calculated by the following formula:
  • the TX0P start-up uplink transmission time of the i-th Non-AP user terminal is at the end of the downlink frame
  • the TXOP time length unit of the Non-AP user terminal can be set to 8us, so that the transmission time of the entire super uplink frame plus one SIFS time can reach 10230 microseconds.
  • the non-AP user terminal passes the application, it obtains its own link identifier from the service flow join response (ADDTS. response) message. If a MAC frame is received from the AP, bits 7 to 2 of the frame control word (see Figure 1) of this frame are 000011, and the basic service set identifier is the same as the AP registered by itself. At this time, the AC layer of the user terminal will scan the entire MAC frame to find its own link identifier. If found, the entire subframe will be viewed by the CRC.
  • the user terminal is required to scan the full frame to receive all the subframes.
  • the Non-AP user terminal will configure its own transmission time based on the start time and duration of the TXOP in the subframe. If the user terminal does not receive the transmission opportunity TX0P message due to a bit error or other reasons, it cannot be sent at the time of the uplink. At this time, after the HC waits for the SIFS plus a timing time, if the wireless medium is found to be idle, the HC will re-control the wireless medium for other purposes, but the time cannot exceed the time specified by the TX0P.
  • the non-AP user terminal If the non-AP user terminal gets the correct subframe, it composes the data or voice packets into a uplink subframe containing the CRC, and then uses the basic service set identifier to XOR the subframe to achieve the suppression of the basic service set identifier. It is also possible to distinguish the purpose of different basic service sets (see Figure 5 - a modulation process), and then limit the length of the transmission of 802.11 packets and the start time as specified by the transmission opportunity TX0P. Bits 7 to 2 of the uplink control word (see Fig. 1) are 000011, and bits 15 and 10 are the number of subframes of the uplink frame, such that one uplink frame can have up to 3 subframes.
  • the concept of multi-subframe is introduced to the same user terminal to solve the problem of jitter packet transmission jitter.
  • the queue size of the uplink is related to the size of the total packet in the buffer of the user terminal, and the unit can be set to bytes, so in addition to the PHY Outside the header, it can have a total of 255 bytes in the uplink, enough to contain more than 2 20ms G. 723 voice packets.
  • the AP When the AP receives the uplink data, it will first use the basic service set identifier to XOR the subframe (see Figure 5-b demodulation process), and then use the CRC check code to determine whether the subframe is correct. If the CRC is correct, the queue size of the uplink report is extracted as the duration of the transmission opportunity TX0P of the next frame, of course, the system must have sufficient resources to satisfy the user terminal request.
  • the AP will release the link identifier from the link identifier library and delete the user terminal in the centralized Registration and registration in time division multiple access mode.
  • the user terminal exits the mechanism after the voice communication ends, the service stream deletion request (DELTS. request) is issued, or the non-AP user terminal considers that the AP idle time exceeds the TSPEC designation. If the non-AP user terminal interferes with the downlink signal and affects its own reception, the terminal may send a message through the action frame to request to quit the mechanism, and the AP may switch to serving the user in the EDCA mode.
  • each subframe contains 32 bits.
  • the CRC check code constitutes an independent checksum, so at the same bit error rate, the error rate of the normal 802.11 protocol is similar to that of the centralized query mode. There is no higher erroneous sub-frame rate due to the longer the Super MAC packet.
  • the packet error rate of 802.11 is compared with the erroneous sub-frame rate of the invention because they carry the same information.
  • the invention avoids redundancy of PHY and MAC headers as much as possible by PHY header sharing and MAC header compression. It can improve efficiency by 2-8 times, and the data is shown in Table 2 and Table 3.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Procédé de réduction de redondance d'échange d'information dans le réseau local sans fil de type 802.11, selon les étapes suivantes: (a) au point d'accès, les paquets de données de petite taille de la part des différents terminaux d'utilisateur sont formés en sous-trame, puis les sous-trames sont rassemblées en super-trame de liaison descendante MAC. Une sous-trame contient le temps de départ et la longueur de TXOP correspondant à un terminal utilisateur et à un identificateur de liaison. Toutes les sous-trames partagent une tête d'information PHY; (b) chaque sous-trame comporte son propre code de vérification CRC; (c) la liaison de chaque point d'accès et de chaque terminal utilisateur non-point d'accès remplace l'adresse de source MAC et l'adresse de destination avec l'identificateur de liaison; (d) la durée/le domaine ID dans la super-trame de liaison descendante MAC contient la durée de toutes les super-trames de liaison descendante MAC et la durée de liaison montante correspondant à tous les terminaux utilisateurs; (e) la trame de liaison montante MAC contient un identificateur de liaison et une taille de file d'attente propres au terminal utilisateur. La taille de file d'attente est définie par la taille totale des tous les paquets, qui n'ont pas été transmis depuis le terminal utilisateur; (f) la trame de liaison montante MAC exécute l'opération XOR avec un ID de série de service de base (BSSID) ou un identificateur de système, de manière à différencier la série de services de base qui est différente.
PCT/CN2007/000763 2006-04-10 2007-03-09 Procédé de réduction de redondance d'échange d'information dans le réseau local sans fil de type 802.11 WO2007115469A1 (fr)

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CN 200610072829 CN101056258B (zh) 2006-04-10 2006-04-10 用于无线局域网802.11中可降低信息交换冗余度的方法
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EP2838223A4 (fr) * 2012-04-11 2015-03-04 Huawei Tech Co Ltd Procédé de découverte d'identité sécurisée
EP2614678A4 (fr) * 2010-09-07 2016-07-20 Intel Corp Dispositif, système et procédé de transmission d'informations de protocoles de couches supérieures
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