WO2017152727A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2017152727A1
WO2017152727A1 PCT/CN2017/072262 CN2017072262W WO2017152727A1 WO 2017152727 A1 WO2017152727 A1 WO 2017152727A1 CN 2017072262 W CN2017072262 W CN 2017072262W WO 2017152727 A1 WO2017152727 A1 WO 2017152727A1
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Prior art keywords
data frame
sig
duration
transmission
level
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PCT/CN2017/072262
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English (en)
Chinese (zh)
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王静
罗俊
于健
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华为技术有限公司
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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
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments of the present invention relate to the field of wireless communications, and in particular, to a data transmission method and apparatus.
  • Wireless Fidelity (WiFi) systems include: Wireless Access Point (AP) and Station (STA).
  • the AP can be a wireless router and the STA can be a mobile terminal.
  • SR Spatial Reuse
  • the space reuse technology mainly aims to perform concurrent transmission of data as much as possible in the case of APs or STAs in different BSSs without interfering with neighboring BSSs. That is, at the same time, data transmission between different devices and their respective peer devices is completed by the same time-frequency resource.
  • the criterion for spatial reuse is based on the Basic Service Set color (BSS color)/Medium Access Control header (MAC header) to determine whether a data packet comes from an overlapping BSS (Overlapping BSS, OBSS). ), and based on the judgment result to determine whether it is possible to spatially multiplex its own spatial transmission resources. For example, only when the STA or the AP monitors the BSS color information carried by the frame header of the data frame does not match its BSS color information, or the MAC header carried by the frame header of the monitored data frame does not match its own MAC header. At this time, the STA or AP will spatially reuse its own space transmission resources.
  • BSS color Basic Service Set color
  • MAC header Medium Access Control header
  • the embodiment of the present invention provides a data transmission method and apparatus.
  • the technical solution is as follows:
  • an embodiment of the present invention provides a data transmission method, where the method includes:
  • the data transmission method provided by the embodiment of the present invention determines whether the spatial reuse transmission is enabled according to the information carried in the data frame by acquiring the data frame of the transmission of the other BSS from the channel, and when the space reuse transmission is determined to be enabled, the threshold is used.
  • the method of competition performs spatial reuse transmission on the channel; solves the problem that the STAs located in the OBSS area have less communication opportunities and the data throughput is not high;
  • the information in the transmitted data packet can be judged whether the space can be reused only by the existing information, thereby saving the energy of the STA and improving the chance of space reuse.
  • the information carried in the data frame includes: a physical layer protocol Determining whether to enable spatial reuse of the SR transmission according to the information carried in the data frame, including: detecting whether the duration of the PPDU carried in the data frame is greater than a first threshold; If the duration of the PPDU is greater than the first threshold, it is determined that the space reuse transmission is enabled.
  • the information carried in the data frame includes: a duration of a transmission opportunity TXOP, and determining, according to information carried in the data frame, whether space reuse transmission is enabled, Including: detecting the said
  • the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL domain in the SIG-A, and a legacy message. Determining a Length Length field in the L-SIG; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame is an uplink single user frame or a downlink single user frame, determining Enabling the spatial reuse transmission; or, if the data frame is an uplink multi-user frame, determining to enable the spatial reuse transmission.
  • the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, and a legacy message. Determining a Length Length field in the L-SIG; determining, according to the information carried in the data frame, whether to enable spatial reuse transmission, if: if the data frame is a downlink multi-user frame, determining to disable the Space reuse transmission.
  • the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL domain in the SIG-A, and a legacy message. Determining a Length Length field in the L-SIG; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame is a downlink multi-user frame, before detecting the data frame Whether there is a request to send an RTS data frame and a clear transmission CTS data frame in the data frame; if the RTS data frame and the CTS data frame are present, it is determined that the space reuse transmission is enabled.
  • the information carried in the transmitted data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, a length of the modulation coding scheme MCS field in the SIG-A and a length of the legacy signaling L-SIG; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: If the data frame is an uplink single-user frame or a downlink single-user frame, it is detected whether the MCS level is greater than the first level; if the MCS level is greater than the first level, determining that the space reuse transmission is enabled.
  • the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the a length and a length field in a modulation coding scheme MCS field and a conventional signaling L-SIG in the SIG-A; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame If it is a downlink multi-user frame, detecting whether the MCS level is greater than the first level; if the MCS level is greater than the first level, determining to enable the space reuse to transmit the indication of the SIG-A in the data frame Whether the MCS level of the SIG-B is greater than the second level; if the MCS level is greater than the second level, it is determined to enable the space reuse transmission.
  • the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the a length and a length field in a modulation coding scheme MCS field and a conventional signaling L-SIG in the SIG-A; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame For the uplink multi-user frame, detecting the trigger frame before the data frame Whether the MCS levels of the respective STAs are all greater than the third level; if the MCS levels of the respective STAs are all greater than the third level, it is determined that the space reuse transmission is enabled.
  • the method also includes:
  • the determining the available duration of the space reuse transmission includes:
  • the determining the available duration of the space reuse transmission includes:
  • the RSSI of each of the RTS data frame and the CTS data frame before the data frame if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold, and the CTS data frame is The RSSI is smaller than the OBSS packet detection threshold, and the duration of the spatial reuse transmission is determined as the duration of the physical layer protocol data unit PPDU level.
  • the determining the available duration of the space reuse transmission includes:
  • determining the duration of the spatial reuse transmission is the duration of the TXOP level.
  • the TXOP level The start time of the duration is equal to the end time of the SIG-A in the data frame, and the end time of the duration of the TXOP level is equal to the end time of the TXOP where the data frame is located.
  • the start time of the duration of the PPDU level is equal to the SIG-A in the data frame.
  • the end time of the duration of the PPDU level is equal to the end time of the data frame.
  • an embodiment of the present invention provides a STA, where the STA includes: a communication component, a processor, and a memory; the processor is configured to execute an instruction, and the communication component is configured to be controlled by the processor
  • the processor implements the data transmission method provided by the above first aspect or any one of the possible implementation manners of the first aspect by executing an instruction.
  • an embodiment of the present invention provides a computer readable storage medium, where the data transmission provided by implementing the foregoing first aspect or any one of the first aspects may be stored.
  • the executable program of the method is not limited to:
  • FIG. 1 is a schematic diagram of an implementation environment involved in a data transmission method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a STA according to an embodiment of the present invention.
  • FIG. 3A is a flowchart of a data transmission method according to an embodiment of the present invention.
  • FIG. 3B is a structural diagram of an exemplary data frame according to an embodiment of the present invention.
  • 4A is a flowchart of a data transmission method according to another embodiment of the present invention.
  • 4B is a flowchart of a data transmission method according to another embodiment of the present invention.
  • 4C is a schematic diagram of implementation of a data transmission method according to another embodiment of the present invention.
  • 4D is a flowchart of a data transmission method according to another embodiment of the present invention.
  • 4E is a schematic diagram of implementation of a data transmission method according to another embodiment of the present invention.
  • 4F is a flowchart of a data transmission method according to another embodiment of the present invention.
  • 4G is a schematic diagram of implementation of a data transmission method according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 6 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 7 is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 8A is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 8B is a flowchart of a data transmission method according to another embodiment of the present invention.
  • FIG. 8C is a structural diagram of an exemplary data frame according to another embodiment of the present invention.
  • FIG. 8D is a flowchart of a data transmission method according to another embodiment of the present invention.
  • a “module” as referred to herein refers to a program or instruction stored in a memory that is capable of implementing certain functions;
  • "unit” as referred to herein refers to a functional structure that is logically divided, the “unit” may be Pure hardware implementation, or a combination of hardware and software.
  • CSMA/CA Carrier Sense Multiple Access with Collosion Avoidance
  • TXOP Transmit Opportunity
  • PPDU Physical Protocal Data Unit
  • Carrier Sense (CS) in a WiFi system consists of two separate and distinct functions: Clear Channel Assessment (CCA) and Network Allocation Vector (NAV).
  • CCA Clear Channel Assessment
  • NAV Network Allocation Vector
  • the CCA is a physical CS mechanism that mainly detects the change of the channel state caused by other nodes.
  • the NAV is a virtual CS mechanism, which mainly enables each STA except the STA being transmitted to maintain silence for a certain period of time.
  • CCA consists of two parts: CS and Energy Detection (ED).
  • CS refers to the preamble that the receiver can listen to and decode the signal received from the channel;
  • ED means that the receiver listens to the Received Signal Strength Indication (RSSI) on the channel based on multiple information, and the ED must Each time slot of the channel is sampled and the channel is judged to be in a busy state or an idle state according to RSSI, which is also referred to as CCA sensitivity.
  • RSSI Received Signal Strength Indication
  • a certain STA needs to receive a signal on the channel before transmitting data on a channel, when detecting A valid preamble is detected, and the CCA threshold indicating that the channel is in a busy state is -82 dBm, that is, when the RSSI is not less than -82 dBm, indicating that the channel is in a busy state; when a valid preamble is not detected, indicating that the channel is in a busy state
  • the CCA threshold is -62 dBm.
  • the STA cannot detect the signal beyond the distance.
  • the premise of the channel competition mechanism is that the channel is detected to be in an idle state, and if the distance between the STAs is Exceeding the distance that the wireless signal can transmit, the STAs cannot detect each other's occupied channels (the two STAs are hidden nodes), thereby simultaneously transmitting data to the AP, and a physical signal conflict is formed when the AP receives the wireless signal.
  • the request to send/clear to send (RTS/CTS) mechanism may be adopted in the Media Access Control (MAC) layer.
  • an RTS frame is sent to the receiving AP, and the receiving AP responds to the CTS frame, and all neighboring stations receive the CTS frame.
  • the STA extracts duration information from the heads of these frames and sets the NAV value based on the duration information.
  • the protocol stipulates that other STAs that receive the RTS/CTS frame must consider that the channel is busy and cannot transmit data during the time required in the RTS/CTS frame, ie, during the NAV setup.
  • the transmitting STA After the transmitting STA receives the CTS frame sent by the receiving AP, it starts to transmit data. If the transmitting STA does not receive the CTS frame within a predetermined time, it needs to retransmit.
  • the RTS/CTS mechanism is usually started when the data to be transmitted reaches a certain size.
  • FIG. 1 is a schematic diagram of an implementation environment of a data transmission method according to an embodiment of the present invention.
  • the implementation environment includes: a wireless access point (AP) 120, a station (Station, STA) 140, an AP 160, and a STA 180.
  • AP wireless access point
  • STA station
  • STA 180 an AP 160
  • STA 180 STA
  • An AP corresponds to a Basic Service Set (BSS).
  • BSS Basic Service Set
  • the AP is a wireless router.
  • An STA is associated with a BSS.
  • the STA is a mobile terminal, such as a smart phone.
  • the area centered on STA 140 is BSS1, and STA 140 is associated with BSS1; the area centered on STA 180 is BSS2, and STA 180 is associated with BSS2.
  • the BSS1 corresponding to the AP 120 and the BSS 2 corresponding to the AP 160 constitute an Overlapping Basic Service Set (OBSS), that is, the area 110 in which the BSS1 and the BSS2 overlap is an OBSS.
  • OBSS Overlapping Basic Service Set
  • the STA 140 is associated with the BSS1 corresponding to the AP 120, and is not associated with the BSS 2 corresponding to the AP 160.
  • the STA 180 is associated with the BSS 2 corresponding to the AP 160 and is not associated with the BSS 1 corresponding to the AP 120.
  • the AP 120 and the AP 160 use the same frequency channel to transmit data.
  • FIG. 2 is a schematic structural diagram of a STA 140 according to an embodiment of the present invention.
  • the STA 140 includes a communication component 220, a processor 230, and a memory 240.
  • the processor 230 is coupled to the communication component 220 and the memory 240.
  • the communication component 220 can be multiple for transmitting data with the wireless access node, and acquiring data frames of transmissions of other BSSs from the channel.
  • the communication component 220 is configured to acquire data frames transmitted by other BSSs from the channel; perform spatial reuse transmission on the channel.
  • Processor 230 includes one or more processing cores.
  • the processor 230 runs the software and the module, thereby Performing various functional applications and data processing, such as determining whether to enable spatial reuse transmission based on information carried in the transmitted data frame; when determining to enable spatial reuse transmission, using a predetermined threshold in a competitive manner through communication component 220 Space reuse transmission on the channel.
  • the memory 240 is used to store software programs and modules.
  • the memory 240 can store an operating system 241, an application module 242 required for at least one function.
  • the application module 242 can include a determination module 221, a transmission module 222, and the like.
  • the determining module 221 is configured to determine, according to information carried in the data frame, whether to enable spatial reuse transmission;
  • the transmission module 222 is configured to perform spatial reuse transmission on the channel in a contention manner using a threshold when determining to enable spatial reuse transmission.
  • the duration determination module 223 is configured to determine the available duration of the spatial reuse transmission.
  • memory 240 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable In addition to Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Disk or Optical Disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read only memory
  • EPROM Programmable Read Only Memory
  • PROM Programmable Read Only Memory
  • ROM Read Only Memory
  • Magnetic Memory Flash Memory
  • Disk Disk
  • Disk Disk or Optical Disk
  • STA 140 structure illustrated in FIG. 2 does not form a limitation of STA 140 and may include more or fewer components or combinations of components, or different component arrangements.
  • the STA 180 has the same or similar structure as the STA 140 shown in FIG. 2, and details are not described herein again.
  • FIG. 3A shows a flowchart of a data transmission method according to an exemplary embodiment of the present invention.
  • This embodiment is exemplified by the data transmission method applied to STAs in the implementation environment shown in FIG. 1.
  • the data transmission method includes the following steps:
  • Step 301 Obtain a transmitted data frame of another BSS from the channel.
  • the STA is located in an OBSS including the present BSS associated with the STA and other BSSs other than the present BSS.
  • the BSS of the AP that has a communication relationship with the current STA is the current BSS associated with the current STA.
  • the data frames transmitted by other BSSs occupy the same channel as the channel occupied by the BSS transmission data frame.
  • the transmitted data frame can be understood as an on-going data frame, that is, a data frame currently being transmitted between one STA and one AP in another BSS.
  • Step 302 Determine whether to enable Spatial Reuse (SR) transmission according to the information carried in the data frame.
  • SR Spatial Reuse
  • the information carried in the transmitted data frame includes: the duration of the PPDU, the duration of the TXOP, the format field in the signaling (Signal-A, SIG-A), and the downlink (Dowlink, DL)/uplink in the SIG-A (Uplink, UL) domain, at least one of a Modulation and Coding Scheme (MCS) field in SIG-A, and a Length field in Legacy-Signal (L-SIG).
  • MCS Modulation and Coding Scheme
  • FIG. 3B it exemplarily shows the structure of a data frame in which the Legacy Short Training Field (L-STF) field and the conventional mode are sequentially from left to right.
  • Legacy Long Training Field (L-LTF) field Legacy Signal Field (L-SIG) field, Repeated Legacy Signal (RL-SIG) field, High Efficiency Signaling (High) Efficiency Signal A, HE-SIG-A) fields and other preambles.
  • L-LTF Legacy Long Training Field
  • L-SIG Legacy Signal Field
  • RL-SIG Repeated Legacy Signal
  • High Efficiency Signaling High Efficiency Signaling
  • HE-SIG-A High Efficiency Signaling
  • the information carried in the transmitted data frame does not include: used to explicitly indicate whether space reuse transmission is enabled. Field.
  • Space reuse can be understood as the same channel. There are two sets of data that are different between the sender and the receiver. The interference generated by the two groups of data does not reach the extent that it can affect another group of data transmission. The degree of mutual interference of the group data does not affect the normal transmission and reception of each other's data.
  • FIG. 1 it is assumed that the AP 160 and the STA 180 are performing data transmission on the channel 2 in FIG. 1 , and the data frame being transmitted by the AP 160 and the STA 180 is regarded as a transmitted data frame, that is, an on-going data frame.
  • the AP 120 and the STA 140 are also When data transmission is performed on channel 2, it can be considered that STA 140 is performing spatial reuse transmission, and spatial reuse transmission between AP 120 and STA 140 does not affect the on-going data frame transmitted between AP 160 and STA 180.
  • Step 303 when it is determined that the space reuse transmission is enabled, the threshold is used to perform spatial reuse transmission on the channel in a competitive manner.
  • the data transmission method determines whether the space reuse transmission is enabled according to the information carried in the data frame by acquiring the data frame transmitted by the other BSS from the channel, and determining the enabling space when determining the enabling space.
  • the threshold is used to perform spatial reuse transmission on the channel in a competitive manner; the problem that the STAs located in the OBSS area have less communication opportunities and the data throughput is not high is solved; and the information in the data packet without additional transmission is achieved. Only through the existing information can we judge whether the space can be reused, which not only saves the energy of the STA, but also improves the chance of space reuse.
  • step 301 can be implemented by the processor of the STA through the communication component; the foregoing step 302 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 303 can be performed by the processor of the STA.
  • the transfer module is implemented.
  • FIG. 4A shows a flowchart of a data transmission method according to another exemplary embodiment of the present invention.
  • This embodiment is exemplified by the data transmission method applied to STAs in the implementation environment shown in FIG. 1.
  • the data transmission method includes the following steps:
  • Step 401 Obtain a transmitted data frame of another BSS from the channel.
  • the STA in the BSS does not perform data transmission, and the other BSSs that are not the BSS are performing data transmission.
  • the information carried in the transmitted data frame includes the duration of the PPDU.
  • the STA determines whether the SR transmission is enabled according to the duration of the PPDU carried in the transmitted data frame.
  • the duration of the PPDU is obtained from the Legacy Length (L-Length) field in the L-SIG field.
  • Step 402 Detect whether the duration of the PPDU carried in the transmitted data frame is greater than a first threshold.
  • the duration of the PPDU is obtained according to the L-Length field in the L-SIG field in the obtained data frame, and the PPDU duration is compared with the first threshold.
  • Step 403 If the duration of the PPDU is greater than the first threshold, determine to enable the SR transmission.
  • the duration of the PPDU is less than the first threshold, it is determined that the SR transmission is not enabled.
  • the available duration of the SR transmission can also be determined.
  • Step 404 determining the available duration of the SR transmission.
  • step 403 may be performed simultaneously with step 403 or after step 405, which is not limited in this embodiment.
  • TXOP level duration There are two kinds of available durations for SR transmission: TXOP level duration and PPDU level duration.
  • the TXOP duration is obtained from the TXOP field in the SIG-A field.
  • the start time of the duration of the TXOP level is equal to the end time of the SIG-A in the transmitted data frame, and the end time of the duration of the TXOP level is equal to the end time of the TXOP where the data frame is located.
  • SIG-A is a field or combination of fields in the transmitted data frame.
  • SIG-A can be regarded as the header of the transmitted data frame.
  • SIG-A supports all versions of the system.
  • SIG-A can also be expressed as HE-SIGA (High Efficiency Signal-A, HE-SIGA).
  • the start time of the duration of the PPDU level is equal to the end time of the SIG-A in the transmitted data frame, and the end time of the duration of the PPDU level is equal to the end time of the transmitted data frame.
  • Step 4041 Acquire respective RSSIs of the RTS data frame and the CTS data frame before the data frame.
  • Step 4042 If the RSSI of each of the RTS data frame and the CTS data frame is smaller than the OBSS packet detection threshold, or if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold and the CTS data frame is not received, determining that the available duration of the SR transmission is The duration of the transmission opportunity TOXP level.
  • the OBSS packet detection threshold is less than the CCA threshold.
  • the start time of the available duration of the SR transmission is the transmitted data frame 43.
  • the end time of the available duration of the SR transmission is the end time 42 of the TXOP where the transmitted data frame 43 is located, that is, the available duration of the spatial transmission is T1, and the value of T1 is the data frame 43 of the transmission.
  • the end time 42 of the TXOP is subtracted from the end time 41 of the SIG-A of the transmitted data frame 43.
  • Step 4043 Acquire respective RSSIs of the RTS data frame and the CTS data frame before the data frame.
  • Step 4044 If the RSSI of the RTS data frame is greater than the OBSS packet detection threshold, and the RSSI of the CTS data frame is smaller than the OBSS packet detection threshold, determine the duration of the SR transmission as the duration of the PPDU level of the layer protocol data unit.
  • the start time of the available duration of the SR transmission is For the end time 45 of the SIG-A of the transmitted data frame 44, the end time of the available duration of the SR transmission is the end time 46 of the transmitted data frame 44, that is, the available duration of the spatial transmission is T2, and the value of T2 is the transmitted data.
  • the end time 46 of the frame 44 is subtracted from the end time 45 of the SIG-A of the transmitted data frame 44.
  • Step 4045 If the link type indicated by the data frame is a neighboring link and the receiving end of the TXOP where the data frame is located remains unchanged, it is determined that the duration of the SR transmission is a duration of the TXOP level.
  • the transmitted data frame has a field indicating a link type and a field indicating a receiving end of the TXOP where the data frame is located, and the STA may directly read the link type indicated by the data frame and the TXOP where the data frame is located from the foregoing two fields.
  • the receiving end may directly read the link type indicated by the data frame and the TXOP where the data frame is located from the foregoing two fields.
  • the transmitted data frame indicates that the link type is a neighboring link and when the receiving end of the TXOP where the data frame is located remains unchanged, the start time of the available time of the SR transmission is For transmission of data frame 47
  • the end time of the available duration of the SR transmission is the end time 49 of the TXOP where the transmitted data frame 47 is located, that is, the available duration of the spatial transmission is T3, and the value of T3 is the location of the transmitted data frame 47.
  • the end time 49 of the TXOP is subtracted from the end time 48 of the SIG-A of the transmitted data frame 44.
  • Step 405 when it is determined that the SR transmission is enabled, the threshold is used to perform SR transmission on the channel in a contention manner.
  • the method further includes:
  • CCA is performed using a CCA fixed threshold.
  • the CCA fixed threshold is -82 mW decibels (-82 dBm) when a valid preamble is detected; the CCA fixed threshold is -62 mW decibels without detecting a valid preamble (- 62dBm).
  • the STA obtains the data frame transmitted by the other BSS from the channel, and determines whether to enable the space reuse transmission according to the information carried in the data frame, when it is determined to be enabled.
  • the threshold is used to perform spatial reuse transmission on the channel in a competitive manner; the problem that the STAs located in the OBSS area have less communication opportunities and the data throughput is not high is solved; and the data packets in the transmission without additional transmission are achieved.
  • Information only through the existing information can be judged whether the space can be reused, which not only saves the energy of the STA, but also improves the chance of space reuse.
  • the specific time length of the space reuse transmission is determined by the information carried in the data, and different durations are allocated for different situations, thereby effectively improving the channel utilization rate.
  • step 401 can be implemented by the processor of the STA through the communication component; the above step 402 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 403 can be performed by the processor of the STA.
  • the determining module is implemented by the above; the above step 404 can be implemented by the processor of the STA executing the duration determining module in the memory of the STA; the above step 405 can be implemented by the processor of the STA executing the transmission module in the memory of the STA.
  • the data frame of the transmission of the other BSS further includes the duration of the TXOP, and may further determine whether to enable the SR transmission according to the duration of the carried TXOP in the transmitted data frame.
  • Step 402 to step 403 are replaced by steps 501 to 502, as shown in FIG. 5:
  • Whether the SR transmission is enabled is determined according to the duration of the TXOP carried in the data frame.
  • the TXOP duration is obtained from the TXOP field in the SIG-A field.
  • Step 501 Detect whether the duration of the TXOP carried in the data frame is greater than a second threshold.
  • Step 502 If the duration of the TXOP is greater than the second threshold, determine to enable the SR transmission.
  • the duration of the TXOP is not greater than the second threshold, it is determined that the SR transmission is not enabled.
  • step 501 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 502 can be implemented by the processor of the STA executing the determining module in the memory of the STA.
  • the data frames transmitted by other BSSs further include a format field in SIG-A, a DL/UL field in SIG-A, and a Length field in L-SIG. It is also possible to determine whether to enable SR transmission according to the format field in the SIG-A carried in the data frame, the DL/UL field in the SIG-A, and the Length field in the L-SIG, when the data frame is an uplink single user. a frame, or an uplink multi-user frame, or a downlink single-user frame, or a downlink multi-user frame, Step 402 to step 403 are replaced by step 402a, or step 402b, as shown in FIG.
  • Whether to enable SR transmission is determined according to the format field in the carried SIG-A in the data frame, the DL/UL field in SIG-A, and the Length field in the L-SIG.
  • the data frame is an uplink single user frame, or an uplink multi-user frame, or a downlink single-user frame, or a downlink multi-user frame.
  • the data frame format can distinguish the 11ax packet type in the 802.11 protocol by using the L-Length field and the SIG-A2 phase in the L-SIG field, and when the Length to 3 is 2, the data packet The High Efficiency Multiple Users Physical Protocal Data Unit (HE-MU-PPDU) or the Extended Sigle User Physical Protocal Data Unit (EXT-SU-PPDU); When the length of the pair is 1, the single-user physical layer protocol data unit (SU-PPDU) or the Trigger-based Physical Protocal Data Unit (Trigger-based PPDU) ).
  • HE-MU-PPDU High Efficiency Multiple Users Physical Protocal Data Unit
  • EXT-SU-PPDU Extended Sigle User Physical Protocal Data Unit
  • the length of the pair is 1, the single-user physical layer protocol data unit (SU-PPDU) or the Trigger-based Physical Protocal Data Unit (Trigger-based PPDU) ).
  • the HE-MU-PPDU and the EXT-SU-PPDU are distinguished by the phase of the SIG-A2; the SU-PPDU and the Trigger-based PPDU are distinguished by a format field in the SIG-A field. Except that the Trigger-based PPDU defaults to the upstream data packet, the other types of data packets are distinguished from the uplink and downlink by the UL/DL field in the SIG-A field.
  • only one field in the data frame indicates the direction of data transmission and the number of users.
  • one field indicates that the data frame is an uplink single-user frame.
  • Step 402a If the data frame is an uplink single user frame or a downlink single user frame, it is determined that the SR transmission is enabled.
  • the STA allows the SR transmission.
  • step 402b if the data frame is an uplink multi-user frame, it is determined that the SR transmission is enabled.
  • the SR transmission can be determined by the collision level of the AP.
  • the data frame is a downlink multi-user frame, it is determined that the SR transmission is not enabled.
  • the receiving end of the data frame is a plurality of STAs.
  • the process of determining whether there is no interference to other STAs is complicated, so the SR transmission is not enabled.
  • step 402a may be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 402b may be implemented by the processor of the STA executing the determining module in the memory of the STA.
  • the data frames transmitted by other BSSs also include the format field in SIG-A, the DL/UL field in SIG-A, and the Length in L-SIG.
  • the data frame is a downlink multi-user frame
  • the SR that is, the RTS data frame and the CTS data frame are received before receiving the transmitted data frame, and the foregoing step 402 to step 403 are performed by step 701 to Step 702 instead of implementation, as shown in Figure 7:
  • Step 701 If the data frame is a downlink multi-user frame, detect whether an RTS data frame and a CTS data frame exist in the data frame before the data frame.
  • Step 702 if there is an RTS data frame and a CTS data frame, it is determined that the SR transmission is enabled.
  • the interference of other STAs as receiving ends can be determined by the RSSI of the CTS, so the SR transmission is enabled.
  • step 701 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 702 can be implemented by the processor of the STA executing the determining module in the memory of the STA.
  • the data frame of the transmission of the other BSS further includes a format field in SIG-A, a DL/UL field in SIG-A, and an MCS field in SIG-A.
  • the Length field in the L-SIG can also be based on the format field in the format in SIG-A in the transmitted data frame, the DL/UL field in SIG-A, the MCS field in SIG-A, and the L-SIG. In the Length field, determine whether the SR transmission is enabled.
  • the data frame is an uplink single-user frame or a downlink single-user frame, the above steps 402 to 403 are replaced by steps 801 to 802, as shown in FIG. 8A:
  • the SR transmission is determined according to the format field in the SIG-A carried in the data frame, the DL/UL field in the SIG-A, the MCS field in the SIG-A, and the Length field in the L-SIG.
  • the data frame format can distinguish the 11ax packet type in the 802.11 protocol by using the L-Length field and the SIG-A2 phase in the L-SIG field, and when the Length to 3 is 2, the data packet It is an HE-MU-PPDU or a EXT-SU-PPDU; when the balance of the Length 3 is 1, it is an SU-PPDU or a Trigger-based PPDU.
  • the HE-MU-PPDU and the EXT-SU-PPDU are distinguished by the phase of the SIG-A2; the SU-PPDU and the Trigger-based PPDU are distinguished by the Format field in the SIG-A. Except that the Trigger-based PPDU defaults to the upstream data packet, the other types of data packets are distinguished by the UL/DL domain in the SIG-A.
  • only one field in the data frame indicates the direction of data transmission and the number of users.
  • one field indicates that the data frame is an uplink single-user frame.
  • Step 801 If it is detected that the data frame is an uplink single user frame or a downlink single user frame, it is detected whether the MCS level is greater than the first level.
  • the first level is a predetermined MCS level.
  • Step 802 If the MCS level is greater than the first level, determine to enable SR transmission.
  • step 801 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 802 can be implemented by the processor of the STA executing the determining module in the memory of the STA.
  • the data frames transmitted by other BSSs further include a format field in SIG-A, a downlink DL/uplink UL field in SIG-A, and SIG-A.
  • the MCS domain and the Length field in the L-SIG determine whether the SR transmission is enabled.
  • Step 803 If the data frame is a downlink multi-user frame, it is detected whether the MCS level of the SIG-B indicated by the SIG-A in the data frame is greater than the second level.
  • the second level is a predetermined MCS level.
  • SIG-B is a field or combination of fields in a data frame.
  • SIG-A supports all versions of the system, and SIG-B only supports higher versions of the system.
  • SIG-A, SIG-B, and data to be transmitted are included in some data frames.
  • the SIG-A field is at the forefront of the data frame, and the SIG-B field is behind the SIG-A field.
  • the information about SIG-B can be obtained by parsing the information in the SIG-A field.
  • FIG. 8C it schematically shows a structure diagram of a data frame including SIG-B in which other preambles and other modes of short training are sequentially performed from left to right.
  • L-STF Long Term Evolution
  • RL-SIG Legacy Signal
  • High Efficiency Signal A1 High Efficiency Signal A1
  • High Efficiency Signal A2 High Efficiency Signal A2
  • High Efficiency Signal B High Efficiency Signal B
  • Step 804 if the MCS level is greater than the second level, it is determined that the SR transmission is enabled.
  • step 803 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 804 can be implemented by the processor of the STA executing the determining module in the memory of the STA.
  • the data frame of the transmission of the other BSS further includes a format field in SIG-A, a DL/UL field in SIG-A, and an MCS field in SIG-A. And determining whether to enable SR transmission in the Lengt field in the L-SIG.
  • the data frame is an uplink multi-user frame
  • the above steps 402 to 403 are replaced by steps 805 to 806, as shown in FIG. 8D:
  • Step 805 If the data frame is an uplink multi-user frame, whether the MCS level of each STA in the trigger frame before detecting the data frame is greater than the third level.
  • the third level is a predetermined MCS level.
  • the trigger frame is represented as a Trigger Frame frame.
  • Step 806 if the MCS levels of each STA are greater than the third level, it is determined that the SR transmission is enabled.
  • step 805 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 806 can be implemented by the processor of the STA executing the determining module in the memory of the STA.
  • the data transmission method may also set the NAV, NAV can be regarded as a timer. During the NAV setting period, the CCA is not performed during the NAV duration.
  • the NAV is set, and the value of the NAV is equal to the difference between the end time of the TXOP where the transmitted data frame is located and the end time of the signaling A in the transmitted data frame.
  • the NAV is set, and the value of the NAV is equal to the difference between the end time of the TXOP where the transmitted data frame is located and the end time of the SIG-A in the transmitted data frame. .
  • the NAV may not be set to provide an opportunity for the SR to be transmitted for subsequent data frames.
  • step 1 may be implemented by a processor of the STA; the foregoing step 2 may be implemented by a processor of the STA.
  • the NAV when it is determined that the SR transmission is not enabled, can also be set in the data transmission method, and the NAV can be regarded as a timer, which is also during the NAV setting.
  • the CCA is not performed within the NAV duration.
  • the NAV is set, and the value of NAV is equal to the difference between the end time of the TXOP where the data frame is located and the end time of SIG-A in the data frame.
  • the NAV is set, and the value of the NAV is equal to the end time of the TXOP where the transmitted data frame is located and the end time of the signaling A in the transmitted data frame. The difference.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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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 concerne un procédé et un dispositif de transmission de données, appartenant au domaine des communications sans fil. Le procédé consiste : à acquérir à partir de trames de données de canal d'une autre transmission BSS ; sur la base des informations transportées dans les trames de données, à déterminer si oui on non activer la transmission de réutilisation spatiale ; et de décider à quel moment activer la transmission de réutilisation spatiale, à utiliser des seuils de manière compétitive sur le canal afin d'implémenter une transmission de réutilisation spatiale ; le problème de faible débit de données et la faible opportunité de communication pour une STA localisée sur une région OBSS est résolu, et si oui ou non une réutilisation spatiale peut être activée est déterminée au moyen seulement d'informations existantes, sans le besoin d'ajouter des informations additionnelles à des paquets de données transmises, ce qui permet d'économiser de l'énergie STA et d'améliorer l'opportunité pour une réutilisation spatiale.
PCT/CN2017/072262 2016-03-10 2017-01-23 Procédé et appareil de transmission de données WO2017152727A1 (fr)

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US11683833B2 (en) 2017-09-28 2023-06-20 Qualcomm Incorporated Spatial listen-before-talk (LBT) with channel variation consideration
WO2019167439A1 (fr) * 2018-02-28 2019-09-06 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ Dispositif de communication radioélectrique et procédé de communication radioélectrique
KR102572878B1 (ko) * 2018-11-16 2023-08-30 삼성전자 주식회사 공간 재사용을 이용하여 데이터를 전송하는 무선 통신 장치 및 이를 이용한 데이터 통신 방법

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CN103858510A (zh) * 2011-09-06 2014-06-11 高通股份有限公司 用于使得多个设备能够共享数据传输时段的方法和装置
WO2015120488A1 (fr) * 2014-02-10 2015-08-13 Mediatek Inc. Méthode d'identification de bss de source dans un wlan
WO2016122363A1 (fr) * 2015-01-30 2016-08-04 Telefonaktiebolaget Lm Ericsson (Publ) Premier nœud et procédé associé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103858510A (zh) * 2011-09-06 2014-06-11 高通股份有限公司 用于使得多个设备能够共享数据传输时段的方法和装置
WO2015120488A1 (fr) * 2014-02-10 2015-08-13 Mediatek Inc. Méthode d'identification de bss de source dans un wlan
WO2016122363A1 (fr) * 2015-01-30 2016-08-04 Telefonaktiebolaget Lm Ericsson (Publ) Premier nœud et procédé associé

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