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WO2012028035A1 - Procédé de contention de ressource et site associé - Google Patents

Procédé de contention de ressource et site associé Download PDF

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Publication number
WO2012028035A1
WO2012028035A1 PCT/CN2011/076957 CN2011076957W WO2012028035A1 WO 2012028035 A1 WO2012028035 A1 WO 2012028035A1 CN 2011076957 W CN2011076957 W CN 2011076957W WO 2012028035 A1 WO2012028035 A1 WO 2012028035A1
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WIPO (PCT)
Prior art keywords
site
resource
parameter
competition
source
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PCT/CN2011/076957
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English (en)
Chinese (zh)
Inventor
姜静
李峰
田开波
李楠
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ZTE Corp
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ZTE Corp
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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

Definitions

  • the present invention relates to the field of wireless communications, and more particularly to a resource contention method and site.
  • the IEEE 802.1 lac system uses Multi-User Multiple Input Multiple Output (MU-MIMO) transmission, that is, multiple users transmit data on the same time-frequency resource.
  • MU-MIMO is an important technology of IEEE 802.11 ac, which can improve system throughput and effectively increase frequency usage.
  • DCF Distributed Coordination Function
  • WLAN Wireless Local Area Network
  • BI backoff initial
  • CW is the key to congestion control in the 802.11 protocol.
  • Backoff time initial value The calculation method of BI is called the backoff algorithm.
  • a station (Station, STA) participating in DCF resource competition, waiting for distributed (coordination function) interframe space (DIFS) after the resource is idle, each station waits for the backoff time ( Backoff Time), if the Backoff Time is 0, the data packet is sent. If the medium is busy when the Backoff Time is 0, the resource will fail and the CW will grow.
  • DIFS distributed interframe space
  • the backoff algorithm used by the IEEE 802.11 Distributed Coordination Function is called the BEB algorithm.
  • a feature of the BEB algorithm is that the size of the contention window CW depends on the number of collisions experienced by the transmitted data packet. Before CW has reached the maximum competition window (maxCW), every failed resource competition will lead to a multiplication of the competition window.
  • the stations in the Basic Service Set BSS
  • BSS Basic Service Set
  • the site will set the backoff time with a larger CW to reduce the probability of collision within the BSS.
  • the size of the window through the discovery of the collision is the response of the IEEE802.il standard protocol to the degree of collision of the shared channel.
  • the STA long retry count (SLRC) or the STA short retry count (SSRC) is incremented by 1 until the SLRC is increased to 802.11.
  • the long counter retry maximum number (dotl lLongRetryLimit) ) CW is set to the minimum contention window (CWmin), or SSRC is increased to 802.11 short counter retry maximum number (dotl lshortRetryLimit), CW is set to CWmin.
  • the present invention provides a resource contention method, the method comprising: when downlink transmission of multi-user multiple input multiple output (MU-MIMO) data, the source site follows a predefined rule from a group of destination sites Selecting a destination site; using parameters corresponding to the selected destination site as parameters of distributed coordination function (DCF) or enhanced distributed coordination access (EDCA) resource competition; and competing parameters of the DCF resource Or EDCA resource competition parameters and other source sites for resource competition.
  • DCF distributed coordination function
  • EDCA enhanced distributed coordination access
  • the predefined rule includes any one of the following rules: Select the site with the highest service priority; select the STA with the STA Long Counter (SLRC) threshold or the STA Short Counter (SSRC) threshold; select the site at the preset location in the group destination; and select the source site to send the send request (RTS) When the resource reservation is made, the RTS carries
  • the preset position is a first position, or a second position, or a third or fourth position.
  • the step of using the parameter corresponding to the selected destination site as the parameter of the DCF resource competition includes: using the following parameter corresponding to the selected destination site as a DCF resource competition parameter: Backoff Time a STA long counter (SLRC) or a STA short counter (SSRC), and a competition window (CW).
  • the source station performs resource competition with other source sites by using parameters of the DCF resource competition. Take any or any of the following steps:
  • the source station When the backoff time in the DCF resource competition parameter is 0, the source station sends a MU-MIMO data frame to the destination site group; if the backoff time is 0, the physical resource is busy, and the Backoff Time is regenerated.
  • Backoff Time Rand[0, C ] * aS/ot7 where Rand[0,CW] represents a random number uniformly distributed between 0 and CW, aSlotTime represents a time slot, and CW is unchanged at this time;
  • the source station sets the contention window (CW) in the DCF resource competition parameter to the DCF minimum contention window (Cwmin); when the source station fails to transmit more than the SLRC threshold or the SSRC threshold
  • the source station sets the CW in the DCF resource competition parameter to a DCF minimum contention window (Cwmin); when the source station receives the ACK of the transmitted MU-MIMO data frame, or the source station sends a transmission request ( After receiving the acknowledgement (CTS), the source station sets the SLRC or
  • the step of using the parameter corresponding to the selected destination site as the parameter of the EDCA resource competition includes: using one or more of the following parameters of the selected destination site as resource competitiveness parameters: backoff time (Backoff Time); STA long counter (SLRC) or STA short counter (SSRC); competition window (CW); EDCA minimum contention window (ECWmin) of the access category (AC) to be sent; EDCA Maximum Competition Window (ECWmax); Maximum Time to Transmit Opportunity (TXOPlimt); Access Class Index (ACI); and Arbitrary Frame Interval Number (AIFSN).
  • the step of the source site performing resource competition with the parameters of the EDCA resource competition with other source sites includes any one of the following steps or any of the following steps: when the EDCA resource competes in the parameters of the backoff When the time is 0, the source station sends the MU-MIMO data frame to the destination site group. If the backoff time is 0, the physical resource is busy, and the Backoff Time is regenerated.
  • the Backoff Time Rand[0, CW] * aSlotTime
  • Rand[0,CW] represents a random number uniformly distributed between 0 and CW
  • aSlotTime represents a time slot
  • CW is unchanged at this time; when each MU-MIMO data frame is successfully transmitted, the source site will be
  • the competition window (CW) in the EDCA resource competition parameter is set to the EDCA minimum competition window (ECWmin); when the source station fails to transmit more than the SLRC threshold or the SSRC threshold, the source station will compete for the EDCA resource.
  • the CW in the parameter is set to the EDCA minimum contention window (ECWmin); after the source station receives the ACK of the transmitted MU-MIMO data frame, or the source station sends a transmission request (RTS) and receives the transmission confirmation (CTS), The source site will use the EDCA
  • the CW in the resource competition parameter, the M is the number of times the source station currently fails to transmit, and when the CW is increased to the EDCA maximum competition window (ECWmax) no longer increases.
  • the present invention also provides a resource competition method, the method comprising: when a multi-user multiple input multiple output (MU-MIMO) data uplink transmission, the destination site follows a predefined rule from a group of sources Selecting a source site in the site, the selected source site uses the parameters of the site as parameters of the Distributed Coordination Function (DCF) or Enhanced Distributed Coordinated Access (EDCA) resource competition, and the DCF resource competition Parameters or EDCA resource competition parameters compete with other source sites for resources.
  • DCF Distributed Coordination Function
  • EDCA Enhanced Distributed Coordinated Access
  • the predefined rule includes any one of the following rules:
  • the preset position is a first position, or a second position, or a third or fourth position.
  • the step that the selected source station uses the parameter corresponding to the site as the parameter of the DCF resource competition includes: the selected source site uses the following parameters of the site as a DCF resource competition parameter: backoff time (Backoff Time), STA long counter (SLRC) or STA short counter (SSRC), the competition window (CW), in the method, the selected source station performs the parameters of the DCF resource competition with other source sites.
  • the steps of resource competition include any or any of the following steps:
  • the source station When the backoff time in the DCF resource competition parameter is 0, the source station sends a MU-MIMO data frame to the destination site group; if the backoff time is 0, the physical resource is busy, and the Backoff Time is regenerated.
  • Backoff Time Rand[0, C ] * aS/ot7 where Rand[0,CW] represents a random number uniformly distributed between 0 and CW, and aSlotTime represents a time slot, at this time CW Unchanged; after each successful transmission of the MU-MIMO data frame, the source station sets the competition window (CW) in the DCF resource competition parameter to the DCF minimum contention window (Cwmin); when the source station fails to transmit The number of times is greater than the SLRC threshold or the SSRC threshold, and the source station sets the CW in the DCF resource competition parameter to the DCF minimum contention window (Cwmin); when the source station receives the ACK of the transmitted MU-MIMO data frame, Or after the source station sends a send request (RTS
  • the step that the selected source station uses the parameter corresponding to the site as the parameter of the EDCA resource competition includes: using one or more of the following parameters of the selected destination site as resource competitiveness parameters: Backoff Time; STA Long Counter (SLRC) or STA Short Counter (SSRC); Competition Window (CW); EDCA Minimum Contention Window (ECWmin) of the Access Category (AC) to be sent; The EDCA maximum competition window (ECWmax) of the category; the maximum time length of the transmission opportunity (TXOPlimt); the access category index (ACI); and the arbitrary frame spacing number (AIFSN).
  • the competition window (CW) in the number is set to the EDCA minimum competition window (ECWmin); when the number of transmission failures of the source station is greater than the SLRC threshold or the SSRC threshold, the source station sets the CW in the EDCA resource competition parameter.
  • the EDCA minimum competition window (ECWmin); after the source station receives the ACK of the transmitted MU-MIMO data frame, or the source station sends a transmission request (RTS) and receives a transmission confirmation (CTS), the source station will
  • the CW in the EDCA resource competition parameter is the number of times the source station currently fails to transmit, and does not increase when the CW increases to the EDCA maximum contention window (ECWmax).
  • the present invention further provides a resource competition site.
  • the site When the site serves as a source site, the site includes: a destination site selection module, a resource competition parameter determination module, and a resource competition module, wherein The destination site selection module is configured to: select, when a multi-user multiple input multiple output (MU-MIMO) data downlink transmission, select a destination site from a group of destination sites according to a predefined rule; The module is configured to: use a parameter corresponding to the destination station selected by the destination site selection module as a parameter of a distributed coordination function (DCF) or an enhanced distributed coordination access (EDCA) resource; The contention module is configured to: perform resource competition with other source sites by using the DCF resource competition parameter or the EDCA resource competition parameter determined by the resource competition parameter determination module.
  • the predefined rules include any of the following rules:
  • the DCF resource competition parameter determined by the resource competition parameter determination module includes: using the following parameters of the selected destination station as DCF resource competition parameters: Backoff Time, STA long counter ( SLRC) or STA short counter (SSRC), the competition window (CW); the EDCA resource competition parameter determined by the resource competition parameter determination module includes one or more of the following parameters: Backoff Time; STA Long counter (SLRC) or STA short counter (SSRC); Competing window (CW); EDCA minimum contention window (ECWmin) of the access category (AC) to be sent; EDCA maximum contention window of the access category to be sent ( ECWmax); maximum time length of the transmission opportunity (TXOPlimt); access class index (ACI); arbitrary frame interval number (AIFSN).
  • the present invention further includes: using the following parameters of the selected destination station as DCF resource competition parameters: Backoff Time, STA long counter ( SLRC) or STA short counter (SSRC), the competition window (CW); the EDCA resource competition parameter determined by the resource competition parameter determination module includes one or more of
  • the source site selection module is configured to: select one source site from a group of source sites according to a predefined rule when multi-user multiple input multiple output (MU-MIMO) data uplink transmission; the resource contention parameter determination module The parameter is set as: a parameter of a source site selected by the source site selection module as a parameter of a distributed coordination function (DCF) or an enhanced distributed coordination access (EDCA) resource;
  • DCF distributed coordination function
  • EDCA enhanced distributed coordination access
  • the resource competition module is configured to: perform resource competition with other source sites by using the DCF resource competition parameter or the EDCA resource competition parameter determined by the resource competition parameter determination module.
  • the technical solution of the present invention solves the problem of the resource competition solution without MU-MIMO transmission in the prior art, ensures the reliability of the MU-MIMO transmission, improves the competitive advantage of the MU-MIMO resource, and is beneficial to improve the system throughput. .
  • FIG. 1 is a schematic diagram of a resource competition method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a resource competition method according to another embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a resource competition site according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a resource competition site according to still another embodiment of the present invention.
  • the source station selects a destination site from a group of destination sites according to a predefined rule, and the source The node will be the parameter corresponding to the selected destination station as a parameter of the Distributed Coordination Function (DCF) or Enhanced Distributed Coordinated Access (EDCA) resource competition, with the DCF resource competition parameter or the EDCA resource competition parameter. Resource competition with other source sites.
  • DCF Distributed Coordination Function
  • EDCA Enhanced Distributed Coordinated Access
  • the destination site selects one source site from a group of source sites according to a predefined rule, and the selected source site will be the site.
  • the parameters are used as parameters of the Distributed Coordination Function (DCF) or Enhanced Distributed Coordinated Access (EDCA) resource competition, and the DCF resource competition parameters or the EDCA resource competition parameters are used for resource competition with other source sites.
  • DCF Distributed Coordination Function
  • EDCA Enhanced Distributed Coordinated Access
  • the uplink transmission is sent to the AP by the STA, and the downlink transmission is sent by the AP.
  • the STA receives; the destination site is the receiving site, and the source site is the transmitting site.
  • the predefined rules include any of the following rules:
  • the group is a destination site group, and when uplinked, the group is a source site group.
  • the step of using the parameter corresponding to the selected destination site as a parameter for the DCF resource competition includes: using the following parameters corresponding to the selected destination site as a DCF resource competition parameter: Backoff Time, the The STA long counter (SLRC) or the STA short counter (SSRC) of the selected destination station, and the contention window (CW) of the selected destination site.
  • SLRC The STA long counter
  • SSRC STA short counter
  • CW contention window
  • the MU-MIMO data includes a MAC PDU and a PHY PDU.
  • the source site uses the parameters of the DCF resource to compete with other source sites for resource competition rules and single-user multiple input multiple output (Single-User Multiple Input Multiple Output, SU-MIMO)
  • the rules for DCF resource competition are the same.
  • the step of using the parameter corresponding to the selected destination site as the parameter of the EDCA resource competition includes: using one or more of the following parameters of the selected destination site as resource competitiveness parameters: Backoff Time ; STA long counter (SLRC) or STA short counter (SSRC); competition window (CW); EDCA minimum contention window (ECWmin) of the access category (AC) to be sent; EDCA of the access category to be sent Maximum Competing Window (ECWmax); Maximum Time to Send Opportunity (TXOPlimt); Access Category Index (ACI); Arbitration Interframe Space Number (AIFSN).
  • the step of the source station performing resource competition with the other source sites by using the parameters of the EDCA resource competition includes any one or more of the following steps: when the backoff time in the EDCA resource competition parameter is 0
  • the competition window (CW) in the contention parameter is set to the EDCA minimum competition window (ECWmin); when the number of transmission failures of the source station is greater than the SLRC threshold or the SSRC threshold, the source station will use the CW in the EDCA resource competition parameter.
  • ECWmin EDCA minimum competition window
  • ECS EDCA minimum competition window
  • RTS transmission request
  • CTS transmission confirmation
  • the site implementing the resource contention method includes a destination site selection module, a resource contention parameter determination module, and a resource competition module, wherein:
  • the destination site selection module is configured to: select, when a multi-user multiple input multiple output (MU-MIMO) data downlink transmission, select a destination site from a group of destination sites according to a predefined rule; the resource contention parameter determination module The parameter is set to: a parameter corresponding to the destination station selected by the destination site selection module as a parameter of a distributed coordination function (DCF) or an enhanced distributed coordination access (EDCA) resource; the resource competition module The method is configured to: perform resource competition with other source sites by using the DCF resource competition parameter or the EDCA resource competition parameter determined by the resource competition parameter determination module.
  • the site includes a source site selection module, a resource contention parameter determination module, and a resource competition module, where:
  • the source site selection module is configured to: select one source site from a group of source sites according to a predefined rule when the MU-MIMO data uplink transmission; the resource contention parameter determination module is configured to: Selecting a parameter of the source site selected by the module as a parameter for DCF or EDCA resource competition; the resource competition module is configured to: use the resource competitiveness parameter determination module to determine a DCF resource competition parameter or an EDCA resource competition parameter. Resource competition with other source sites.
  • the parameters corresponding to the site with the highest service priority are the resource competition parameters, and the rules of the contention resource are based on the DCF resource competition rule of the SU-MIMO, and the resource is always used as the resource competition parameter. Appointment or resource competition.
  • the backoff time is calculated as follows:
  • Backoff Time Rand[0, CW] * aSlotTime
  • CW sets Cwmin.
  • the group location in the specified group ID is the first digit, or the second digit, or the third digit, or the fourth digit corresponding to the site is a resource competition parameter
  • the rules of the contention resource are in accordance with the SU.
  • - MIMO DCF resource competition rules always use the resource competition parameters for resource competition. The specific process is as follows: When the multi-site MPDU is ready to be sent, the CW (Retraction Window) in the resource competition parameter is calculated according to the following equation (5):
  • Backoff Time Rand[0, CW] * aSlotTime Equation (6)
  • CW sets Cwmin.
  • the CW (Retraction Window) in the resource competition parameter is calculated according to the following equation (7):
  • Equation (7) M is the number of current transmission failures.
  • the backoff time is calculated according to the following formula
  • Backoff Time Rand[0, CW] * aSlotTime Equation (8)
  • CW sets
  • the EDCA resource competition rule of SU-MIMO always uses the resource competition parameters as a benchmark for resource competition.
  • the specific competition and backoff process is as follows: Each transmission queue uses the selected site access category (Access Category, AC for short) corresponding to /FS[C] CW ⁇ AC], Cf [ ⁇ C ] and the maximum number of retransmissions. When there is a conflict due to the competition channel, it enters the backoff process. During this process, the backoff timer Backoff Timer is set to any integer value in the range [0, CW].
  • the initial value of CW[AC] is set to CU ⁇ C].
  • the value of c [ c] corresponding to the selected site AC is increased to (C [ C] + l) x 2-1 , when c [ c ] is increased to c max [ c], Keep the value of ⁇ ⁇ ⁇ unchanged and no longer increase.
  • the site will be selected
  • c [ C] corresponding to AC is reset to CU ⁇ C] and continues to listen to the channel.
  • Backoff counter per test To a free time slot, the value (BT) is decremented by 1.
  • the data frame that is first reduced to zero occupies the channel. If the backoff timer of multiple ACs in the node is simultaneously reduced to zero, the data frame of the higher priority queue will be Occupying the channel, other data frames enter a new round of backoff.
  • the technical solution of the present invention solves the problem of the resource competition solution without MU-MIMO transmission in the prior art, ensures the reliability of the MU-MIMO transmission, improves the competitive advantage of the MU-MIMO resource, and is beneficial to improve System throughput.

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

Abstract

La présente invention se rapporte à un procédé de contention de ressource et à un site associé. Le procédé comprend les étapes suivantes : lors d'une transmission sur la liaison descendante de données à multiples entrées et à multiples sorties de multiples utilisateurs (MU-MIMO, Multi-User Multiple Input Multiple Output), un site source sélectionne un site de destination parmi un groupe de sites de destination selon des règles prédéfinies, utilise un paramètre correspondant au site de destination sélectionné comme paramètre de contention de ressource de fonction de coordination répartie (DCF, Distributed Coordination Function) ou d'accès amélioré aux canaux répartis (EDCA, Enhanced Distributed Channel Access), et effectue une contention de ressource avec d'autres sites sources à l'aide du paramètre de contention de ressource de fonction DCF ou du paramètre de contention de ressource d'accès EDCA. La présente invention garantit la fiabilité de la transmission MU-MIMO et améliore l'avantage de la contention de ressource MU-MIMO.
PCT/CN2011/076957 2010-09-02 2011-07-07 Procédé de contention de ressource et site associé Ceased WO2012028035A1 (fr)

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