WO2016131191A1 - Procédé et dispositif d'accès au canal - Google Patents

Procédé et dispositif d'accès au canal Download PDF

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Publication number
WO2016131191A1
WO2016131191A1 PCT/CN2015/073222 CN2015073222W WO2016131191A1 WO 2016131191 A1 WO2016131191 A1 WO 2016131191A1 CN 2015073222 W CN2015073222 W CN 2015073222W WO 2016131191 A1 WO2016131191 A1 WO 2016131191A1
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WIPO (PCT)
Prior art keywords
trigger
access
sta
access process
frame
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PCT/CN2015/073222
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English (en)
Chinese (zh)
Inventor
杨懋
周润
林英沛
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华为技术有限公司
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Priority to PCT/CN2015/073222 priority Critical patent/WO2016131191A1/fr
Priority to CN201580071168.4A priority patent/CN107211453B/zh
Publication of WO2016131191A1 publication Critical patent/WO2016131191A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/04—Scheduled or contention-free access

Definitions

  • the present invention relates to the field of wireless communications technologies, and in particular, to a channel access method and a channel access device.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • WiFi Wireless Fidelity
  • Chinese Wireless Fidelity Technology
  • MAC English: Media Access Control
  • Chinese Media access control layer
  • the STA In addition to the OFDMA uplink access mode, if the STA wants to access the channel, it can also access through the DCF (Distributed Coordination Function, Chinese: Distributed Point Coordination Function) uplink access mode.
  • DCF Distributed Coordination Function
  • the AP-based OFDMA uplink access mode is only applicable to new STAs that support the new standard. For traditional (Legacy) STAs, the channel can only be accessed through the DCF access mode.
  • the current system only supports the OFDMA uplink access mode based on the AP triggering, or only supports the DCF access mode, that is, the two uplink access modes cannot exist at the same time. Because if the two methods exist in one system at the same time, the STAs in the system, especially the new STAs, are likely to be triggered by the AP when preparing for DCF access, which may make the STA unable to select exactly how. Access to the AP eventually results in an access failure.
  • the embodiment of the invention provides a channel access method and a channel access device, which are used to solve the technical problem that the uplink access efficiency is low.
  • a first aspect of the present invention provides a channel access method, which is applied to a WLAN, and includes:
  • the access point AP schedules at least two rounds of the Trigger access process, and the AP sends a broadcast message in the process of scheduling the current round of Trigger access, and the broadcast message includes a time parameter for scheduling the next round of Trigger access process.
  • the time parameter of the next round of the Trigger access process is specifically:
  • the AP Determining, by the AP, the time parameter of the next round of the Trigger access process according to the number of the access conflicts or the traffic volume in the current round of the Trigger access process, where the time parameter includes the start of the next round of the Trigger access process Time or time interval between the current Trigger access process and the next round of Trigger access procedures.
  • the next round of the Trigger access process begins.
  • Time is the end time of the Trigger access process for this round.
  • the next round of Trigger access There is a time interval between the target start time of the process and the end time of the current Trigger access process, which is used for DCF access.
  • the current Trigger access process is scheduled by managing frames.
  • the broadcast message sent by the AP is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming the received data, a Beacon frame or a Probe response frame, and data.
  • the signaling part of the frame is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming the received data, a Beacon frame or a Probe response frame, and data.
  • the Trigger access process is used to trigger centralized control or scheduling.
  • the OFDMA method, the collision avoidance CSMA method, or a hybrid access mode of the two is adopted.
  • a second aspect of the present invention provides a channel access method, which is applied to a WLAN, and includes:
  • the station STA receives a broadcast message, where the broadcast message includes a time parameter of the Trigger access procedure;
  • the STA performs DCF access outside the guard interval of the Trigger access procedure.
  • the DCF access specifically includes:
  • the STA If the STA fails to complete the backoff before the guard interval of the Trigger access procedure, the STA records the value of the backoff counter, the DCF access is suspended, and the STA participates in the Trigger access procedure.
  • the DCF access is suspended, and the STA participating in the Trigger access process specifically includes:
  • the STA If the STA successfully accesses in a scheduled manner in the scheduling time slot of the Trigger, the STA cancels the DCF access, and clears the value of the recorded backoff counter;
  • the STA If the STA fails to access in a scheduled manner in the scheduling time slot of the Trigger, the STA restores the value of the backoff counter before the guard interval of the Trigger access process after the guard interval of the Trigger access process, and continues the DCF access. .
  • the method further includes: if the STA does not receive the protection interval of the Trigger access process After the Trigger accesses the Trigger frame, the STA restores the value of the backoff counter before the guard interval of the Trigger access process after the guard interval of the Trigger access process, and continues the DCF access.
  • the time parameter includes the start time of the Trigger access procedure or the time interval of the Trigger access procedure of different rounds.
  • the broadcast message is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming successful reception of the received data, a Beacon frame or a Probe response frame, and signaling in the data frame. section.
  • the Trigger access process is used to trigger centralized control or scheduling.
  • the OFDMA method, the collision avoidance CSMA method, or a hybrid access mode of the two is adopted.
  • a third aspect of the present invention provides an AP, including a scheduling module and a sending module, where:
  • the scheduling module is configured to schedule at least two rounds of Trigger access procedures, and send a broadcast message by using the sending module during scheduling of the current round of Trigger access, where the broadcast message includes a time for scheduling a next round of Trigger access process parameter.
  • the AP further includes a determining module, configured to reserve a time parameter of a next round of Trigger access process, where the determining module is specifically configured to: Determining the time parameter of the next round of the Trigger access process, the time parameter includes the start time of the next round of the Trigger access process, or the current round, in the current round of the Trigger access process. The time interval between the Trigger access process and the next round of Trigger access procedures.
  • the next round of the Trigger access process is the end time of the Trigger access process for this round.
  • the next round of Trigger access There is a time interval between the target start time of the process and the end time of the current Trigger access process, which is used for DCF access.
  • the current Trigger access process is scheduled by managing frames.
  • the broadcast message sent by the AP is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming that the received data is successfully received, a Beacon frame or a Probe response frame, and a data frame. Signaling part.
  • the Trigger access process is used to trigger centralized control or scheduling.
  • the OFDMA method, the collision avoidance CSMA method, or a hybrid access mode of the two is adopted.
  • a STA including:
  • a receiving module configured to receive a broadcast message, where the broadcast message includes a time parameter of a Trigger access process
  • a determining module configured to determine, according to the broadcast information, a guard interval of the Trigger access process
  • An operation module configured to perform DCF access outside the guard interval of the Trigger access process.
  • the operating module is used for DCF access, specifically:
  • the record is retired.
  • the value of the counter is avoided, the DCF access is suspended, and the STA participates in the Trigger access process.
  • the operation module is specifically used to stop the DCF access, and the STA participates in the Trigger access
  • the process is specifically:
  • the STA fails to access the Trigger in the scheduled time slot of the Trigger, the value of the backoff counter before the guard interval of the Trigger access process is restored after the guard interval of the Trigger access process, and the DCF access is continued. .
  • the operating module is further configured to: if the receiving module is not within the guard interval of the Trigger access process After receiving the Trigger frame of the Trigger access process, after the guard interval of the Trigger access process, the value of the backoff counter before the guard interval of the Trigger access process is restored, and the DCF access is continued.
  • the time parameter includes the start time of the Trigger access procedure or the time interval of the Trigger access procedure of different rounds.
  • the broadcast message is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming successful reception of the received data, a Beacon frame or a Probe response frame, and signaling in the data frame. section.
  • the Trigger access process is used to trigger centralized control or scheduling.
  • the OFDMA method, the collision avoidance CSMA method, or a hybrid access mode of the two is adopted.
  • an AP including a memory, a processor, and a transceiver connected to a same bus;
  • the memory is configured to store an instruction
  • the processor is configured to execute the instruction, schedule at least two rounds of Trigger access procedures, and send a broadcast message through the transceiver during scheduling of the current round of Trigger access, where the broadcast message includes scheduling a next round of Trigger The time parameter of the access process.
  • the processor is further configured to reserve a time parameter of the next round of the Trigger access process, specifically: according to the current round Trigger access process Determine the time parameter of the next round of Trigger access process, the time parameter includes the start time of the next round of Trigger access process or the current round of Trigger access process and the next round Interval of the Trigger access process.
  • a second possible implementation manner of the fifth aspect if the number of access conflicts or the traffic volume is greater than a threshold, the next round of the Trigger access process begins. Time is the end time of the Trigger access process for this round.
  • the next round of Trigger access There is a time interval between the target start time of the process and the end time of the current Trigger access process, which is used for DCF access.
  • the current Trigger access process is scheduled by managing frames.
  • the broadcast message sent by the processor through the transceiver is carried by a control frame, a management frame or a data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming successful reception of the received data, a Beacon frame or a Probe.
  • the response frame the signaling portion of the data frame.
  • the Trigger access process is used to trigger a centralized control or scheduling process, and adopts an OFDMA method in a centralized control phase.
  • a STA comprising a memory, a processor and a transceiver connected to the same bus;
  • the memory is configured to store an instruction
  • the transceiver is configured to receive a broadcast message, where the broadcast message includes a time parameter of a Trigger access process
  • the processor is configured to execute the instruction, determine a guard interval of the Trigger access process according to the broadcast information, and perform DCF access outside the guard interval of the Trigger access process.
  • the processor is used for DCF access, specifically:
  • the STA fails to complete the backoff before the guard interval of the Trigger access process, the value of the backoff counter is recorded, the DCF access is suspended, and the STA participates in the Trigger access process.
  • the processor is specifically used to stop the DCF access, and the STA participates in the Trigger access
  • the process is specifically:
  • the STA fails to access the Trigger in the scheduled time slot of the Trigger, the value of the backoff counter before the guard interval of the Trigger access process is restored after the guard interval of the Trigger access process, and the DCF access is continued. .
  • the processor is further configured to: if the transceiver is not within the guard interval of the Trigger access process The Trigger frame that receives the Trigger access process is in the guard interval of the Trigger access process. After that, the value of the backoff counter before the guard interval of the Trigger access process is restored, and the DCF access is continued.
  • the time parameter includes the start time of the Trigger access procedure or the time interval of the Trigger access procedure of different rounds.
  • the broadcast message is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming successful reception of the received data, a Beacon frame or a Probe response frame, and signaling in the data frame. section.
  • the Trigger access process is used to trigger centralized control or scheduling.
  • the OFDMA method, the collision avoidance CSMA method, or a hybrid access mode of the two is adopted.
  • the AP may schedule at least two rounds of the Trigger access process, and the AP may send a broadcast message in the process of scheduling the current round of Trigger access, where the broadcast message includes a time parameter for scheduling the next round of Trigger access process. Therefore, after receiving the broadcast message, the STA may wait for the triggering of the AP according to the time parameter included in the broadcast message, that is, the STA is equivalent to knowing the next round of Trigger access. The time begins so that you can wait for access at the right time.
  • the Trigger access process is an OFDMA uplink access procedure, and just because the time parameter of the subsequent Trigger access procedure is known, the STA performs the Trigger access gap (that is, after the last Trigger access procedure is completed). And DCF access can be performed before the start of the next Trigger access process, thereby minimizing the conflict between DCF access and Trigger access, so that one system can simultaneously support two uplink access technologies, then Through the DCF access, the traditional STA can be connected to the AP as much as possible, and the Trigger access can improve the efficiency of the uplink access as much as possible, so that the uplink access process of the STA in the system becomes more efficient and reliable.
  • FIG. 1A is a schematic diagram of a system of a typical WLAN deployment scenario
  • FIG. 1B is a flowchart of an OFDMA uplink access procedure triggered by an AP
  • FIG. 3A is a flowchart of a channel access method according to an embodiment of the present invention.
  • FIG. 3B is a schematic diagram showing a frame structure of a common frame of a MAC layer according to an embodiment of the present invention
  • FIG. 4 is a flowchart of another channel access method according to an embodiment of the present invention.
  • FIG. 5 is a sub-flow diagram of a part of a procedure for a STA to coordinate Trigger access and DCF access according to an embodiment of the present invention
  • FIG. 6 is a sub-flow diagram of a part of a procedure for a STA to coordinate Trigger access and DCF access according to an embodiment of the present invention
  • FIG. 7 is a sub-flow diagram of a part of a procedure for a STA to coordinate Trigger access and DCF access according to an embodiment of the present invention
  • FIG. 8 is a structural block diagram of an AP according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a STA according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an AP according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a STA according to an embodiment of the present invention.
  • the embodiment of the present invention can be applied to a WLAN (English: Wireless Local Area Networks, WLAN).
  • the WLAN can include multiple basic service sets (abbreviation: BSS, English: Basic Service Set), and the network nodes in the basic service set are Site (English: Station, abbreviation: STA), the site includes access point class sites (abbreviation: AP, English: Access Point) and non-access point class sites (English: None Access Point Station, referred to as: Non-AP STA).
  • Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
  • Access point class (abbreviation: AP, English: Access Point), also known as wireless access Entry points or hotspots, etc.
  • the AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the standard adopted by AP is IEEE (English: Institute of Electrical and Electronics Engineers) 802.11 series.
  • the AP may be a terminal device or a network device with a WiFi chip.
  • the AP may be a device that supports the 802.11ax system. Further, the AP may be configured to support multiple WLANs such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a (English: Wireless Local Area Network, Chinese: Wireless LAN) Standard equipment.
  • a non-access point class (English: None Access Point Station, referred to as Non-AP STA), which can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • a mobile phone that supports wireless fidelity (English: Wireless Fidelity, referred to as WiFi) communication function
  • a tablet computer that supports WiFi communication function
  • a set-top box that supports WiFi communication function
  • a smart TV that supports WiFi communication function
  • a WiFi communication function Smart wearables and computers that support WiFi communication.
  • the site can support the 802.11ax system.
  • the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • FIG. 1A is a schematic diagram of a typical WLAN deployment scenario, including an AP and four STAs, and the AP communicates with STA1, STA2, STA3, and STA4, respectively.
  • STAs can be classified into primary STAs or secondary STAs by APs.
  • the primary STA sends a message to the AP, so that the AP obtains the uplink data length of the primary STA, and the secondary STA obtains the uplink data length of the primary STA by listening to the message of the primary STA, and sends the uplink data sent by itself and the uplink data sent by the primary STA. Align.
  • the number of secondary STAs may be one or more.
  • FIG. 1A The access process in the prior art will be described by taking FIG. 1A as an example.
  • FIG. 1A only one uplink access mode is generally supported. That is, the system shown in FIG. 1A supports only the DCF access mode or only the AP-based uplink OFDMA uplink access mode.
  • any STA in Figure 1A wants to connect.
  • the STA can access the DCF mode by itself. In this way, the STA can only access the channel one by one, and the access efficiency is low.
  • the AP can send a Trigger message by broadcast, and the STA that receives the Trigger message can access the channel.
  • This access mode can access more STAs at one time, and the access efficiency is higher.
  • this access method only supports new versions of STAs. For example, in the four STAs shown in FIG. 1A, STA1 and STA4 are old versions of STAs, and STA2 and STA3 are new versions of STAs. Then, for example, all four STAs receive Trigger messages, and STA2 and STA3 can be connected. The channel is entered, and STA1 and STA4 cannot access the channel. It can be seen that although this method has high access efficiency, it cannot cover all STAs, so that some STAs may not be able to access the channel.
  • FIG. 1A the hardware architecture of FIG. 1A is used to introduce the OFDMA uplink access procedure triggered by the AP and the DCF access procedure.
  • FIG. 1B is a specific process of an OFDMA uplink access procedure triggered by an AP.
  • Step 101 The AP sends a Trigger (Chinese: Trigger) frame to trigger an OFDMA uplink access.
  • the AP can send Trigger frames by broadcast. Go to step 102.
  • Step 102 After receiving the Trigger frame and waiting for the SIFS (English: Short Interframe Space), the STA that needs to send the uplink data randomly selects a subchannel and sends an RTX (Chinese: Send Request) frame request data to the AP. send. Go to step 103.
  • RTX is a message in the next generation WiFi, similar to the function of RTS in the current WIFI 802.11 protocol.
  • STA1 and STA4 are old versions of STAs
  • STA2 and STA3 are new versions of STAs
  • the STAs here can only be STA2 or STA3 in FIG. 1A.
  • Step 103 After receiving the RTX frame sent by multiple STAs in parallel by the OFDMA mode and waiting for the SIFS, the AP sends a CTX (Chinese: Allowed to Send) frame to perform resource scheduling on the STA that successfully sends the RTX. Go to step 104.
  • CTX is the message in the next generation WIFI, which is similar to the function of CTS in the current WiFi 802.11 protocol.
  • the AP may only send a CTX frame to the STA that determines that the uplink data can be transmitted. For example, the AP receives a total of 5 RTX frames sent by the STA, and the current channel has only 4, then the AP. It is possible to select only 4 STAs from and send CTX frames to these 4 STAs, and STAs that do not receive CTX frames naturally cannot transmit uplink data.
  • the specific AP may select the four STAs according to the priority of the uplink data sent by different STAs, or may select the four STAs by any other possible manner.
  • the resource scheduling described herein may refer to allocating a channel to the STA, so that the STA can transmit uplink data on the channel allocated thereto.
  • Step 104 The STA that receives the CTX transmits uplink data on the corresponding subchannel according to the scheduling result. Go to step 105.
  • Step 105 After successfully receiving the uplink data, the AP sends a BA (English: Block Acknowledgement) frame to the STA transmitting the uplink data to confirm that the uplink data is successfully transmitted.
  • BA Basic: Block Acknowledgement
  • FIG. 2 is a specific process of the DCF access process.
  • Step 201 When the STA has uplink data to be sent, firstly, the channel idle state is detected. If the channel idle time continues to reach DIFS (English: Distributed Inter-frame Spacing, Chinese: distributed interframe gap), the backoff counter is turned on. Perform the backoff process.
  • DIFS International Standard Inter-frame Spacing, Chinese: distributed interframe gap
  • This STA can be any of the STAs in Figure 1A.
  • step 201 If the channel is busy again during the backoff process, the backoff process is suspended, and the backoff process is continued after the channel is idle again and the DIFS is maintained. When the backoff counter reaches 0, the process proceeds to step 202, otherwise, it stays at step 201.
  • Step 202 The STA sends an RTS (English: Request To Send) frame to the AP to send uplink data. Go to step 203.
  • RTS Request To Send
  • Step 203 After receiving the RTS, the AP waits for the SIFS, and returns a CTS (English: Clear To Send) to the STA to instruct the STA to perform uplink data transmission. Go to step 204.
  • CTS Chinese: Clear To Send
  • Step 204 The STA receives the CTS and waits for the SIFS to transmit the uplink data to the AP. Go to step 205.
  • Step 205 After the uplink data transmission ends and waits for the SIFS, the AP sends an ACK (English: Acknowledgement, Chinese: Acknowledgement) frame to the STA to confirm successful transmission.
  • ACK English: Acknowledgement, Chinese: Acknowledgement
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article unless otherwise specified, generally indicates that the contextual object is an "or" relationship.
  • an embodiment of the present invention provides a channel access method, where the method can be applied to a WLAN (English: Wireless Local Area Networks, English: wireless local area network), and the main process of the method is described as follows.
  • WLAN Wireless Local Area Networks
  • English wireless local area network
  • Step 301 The AP schedules at least two rounds of the Trigger access process, and the AP sends a broadcast message in the process of scheduling the current round of Trigger access, where the broadcast message includes a time parameter for scheduling the next round of Trigger access process.
  • the time parameter of the next round of the Trigger access process is specifically:
  • the AP Determining, by the AP, the time parameter of the next round of the Trigger access process according to the number of the access conflicts or the traffic volume in the current round of the Trigger access process, where the time parameter includes the start of the next round of the Trigger access process Time or time interval between the current Trigger access process and the next round of Trigger access procedures.
  • the traffic volume in the current Trigger access process refers to how many STAs participate in the current Trigger access process.
  • the AP wants to know the number of access collisions in the current Trigger access process, it can be learned by power detection. After the AP triggers the current Trigger access, the AP can detect the power of each channel. Under normal circumstances, only one STA on a channel is transmitting data, then in this channel The detected power should be relatively stable, and if there is a conflict in the channel, the detected power on the conflicting channel may be relatively high, for example, may be several times the normal power, then For example, if the power detected on one channel is three times the normal channel power, it can be known that there are three STAs colliding on this channel, that is, the number of access collisions on this channel is three. The same processing is performed for each channel, and the total number of access collisions in the current Trigger access process can be obtained.
  • the AP knows the number of STAs that have collided during the current Trigger access process (that is, the number of access collisions), then it is equivalent to knowing how many STAs in the current Trigger access have not completed access. For another example, the AP knows the amount of traffic in the current Trigger access process, which is equivalent to knowing how many STAs need to access the channel. Therefore, the AP can determine the time parameter of the next round of the Trigger access process according to the number of access conflicts or the amount of traffic in the current Trigger access process.
  • the AP can set the interval between the current Trigger access process and the next Trigger access process to be smaller, that is, the next round of Trigger The access process starts as soon as possible, so that more STAs access the channel as soon as possible, improving channel access efficiency.
  • the start time of the next round of the Trigger access process is the end time of the Trigger access process.
  • the time interval is used for DCF access.
  • the AP can control that there is no time interval between the next round of Trigger access process and the current Trigger access process.
  • the next round of Trigger access process is to ensure that more STAs access the channel as soon as possible, and improve channel access efficiency.
  • the AP can set a certain time interval between the current Trigger access process and the next round of the Trigger access process, so that the STA performs the Trigger access process.
  • the gap can also perform the DCF access process, making the old version of the STA It is also possible to access the channel, and to improve the channel access efficiency, as far as possible, enable various types of STAs to transmit uplink data.
  • the length of the time interval between the two-way Trigger access process may be set according to the specific number of access conflicts or the amount of traffic, which is not limited by the present invention.
  • the threshold value may be set according to the number of access conflicts or the amount of traffic.
  • the threshold When the threshold is set according to the number of access conflicts, the threshold may be, for example, an access collision number value. For example, in the random access process, the UE is divided into 9 competing subchannels on the 20 MHz bandwidth. If there are two or more STAs on the more than 4 channels for random access, the AP considers that the current number of access conflicts is large, or Currently, there are many STAs that need to access the channel, and the traffic is large. The start time of the next Trigger access process is triggered, for example, the end time of the Trigger access process.
  • the threshold value may be the amount of data that needs to be transmitted currently.
  • the AP side buffers a large amount of data to be delivered.
  • the AP triggers the next round of Trigger connection.
  • the start time of the incoming process is, for example, the end time of the current Trigger access process.
  • the time parameter may include a start time of a next round of Trigger access process, or may include a time interval between a current round of Trigger access process and a next round of Trigger access process. If the time parameter includes the time interval between the current Trigger access process and the next round of the Trigger access process, the AP can be regarded as only the next round of the Trigger access process, or can be regarded as an AP. A number of rounds of Trigger access procedures have been reserved.
  • the next round of Trigger access process is performed after the time interval included in the time parameter, in the next round of Trigger. After the access process is completed, after the time interval included in the time parameter, the next round of Trigger access process is performed, and the cycle is repeated.
  • the current round of Trigger access process is scheduled by using a management frame.
  • the next round of the Trigger access process can be scheduled by the broadcast message sent by the current Trigger access process, and the current Trigger access process can be understood as the first Trigger access process.
  • the current Trigger access process may be scheduled by a management frame, for example, the management frame may be a Beacon (Chinese: Beacon) frame.
  • FIG. 3B is a schematic diagram showing a frame structure of a general frame of a MAC layer according to an embodiment of the present invention.
  • the frame structure includes a MAC (English: Media Access Control) Header, a variable length frame body, and a frame check sequence.
  • Frame control (Chinese: Frame Control), (Chinese: Frame Length), Address (Chinese: Address) 1, 2, 3, Sequence Control (Chinese: Sequence Control) and HT (English: High Throughput, Chinese: The high throughput) control (Chinese: Control) field constitutes the MAC Header, that is, the MAC Header contains frame control information, frame length information, address information, sequence control information, and QoS (English: Quality of Service, Chinese: Quality of Service) information. , and HT control information.
  • the Frame control field includes some control information of the frame, such as the type of the frame, the subtype, and the like; the Duration field indicates the time that the occupied channel will still occupy the channel after the end of the frame; the Sequence Control field is given.
  • MSDU English: MAC Service Data Unit, Chinese: Media Access Control Service Data Unit
  • MMPDU English: MAC management protocol data unit, Chinese: Media Access Control Management Protocol Data Unit
  • serial number and fragment number
  • HT control The field gives control information related to HT or VHT (English: very high throughput); there are four fields for address information (Address 1-4), which is used to indicate which packet the packet is. Which STA or AP is sent by the STA or AP.
  • Address 1 is used to indicate the address of the receiving end
  • Address 2 is used to indicate the address of the sending end
  • Address 3 is used to indicate the source address or destination address.
  • Frame Body Choinese: frame body, used to carry the specific information of the frame.
  • FCS (English: Frame Check Sequence, Chinese: Frame Check Sequence), used for verification.
  • a frame When a frame is a management frame, its frame format is basically the same as that of FIG. 3B, except that the Address 4 field in FIG. 3B is not in the management frame.
  • the broadcast message sent by the AP is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a traditional CTS frame for responding to the RTS or a block for confirming successful reception of the received data.
  • Confirm (BA) frame Beacon frame or Probe response (Chinese: Probe Response) frame, signaling part in the data frame.
  • the CTS frame may refer to a conventional CTS frame, or may also refer to a newly modified CTS frame applicable to IEEE 802.11.
  • the RTS frame, the CTS frame, and the BA frame belong to the control frame
  • the Beacon frame and the Probe response frame belong to the management frame
  • the signaling part in the data frame belongs to the data frame.
  • the broadcast message may be carried in the Frame Body part of the management frame.
  • a field may be added directly in the signaling part of the data frame to carry the broadcast message.
  • a field may be directly added to the control frame to carry the broadcast message.
  • the Trigger access process is used to trigger centralized control or scheduling, and adopts OFDMA mode and CSMA with collision avoidance in the centralized control phase (English: Carrier Sense Multiple Access, Chinese: Carrier Detection) Listen to multiple access) or a hybrid access method.
  • OFDMA mode OFDMA mode
  • CSMA Carrier Sense Multiple Access
  • the STA may receive the broadcast message. In this way, the STA can perform the Trigger access process according to the time parameter included in the broadcast message, and if there is a time interval between the two rounds of Trigger access processes, the STA can perform DCF in the gap between the two rounds of Trigger access processes. Access process.
  • the DCF access can ensure that the traditional STA accesses the AP, and the Trigger access can improve the efficiency of the uplink access as much as possible.
  • the STA's uplink access process becomes more efficient and reliable.
  • the AP after the AP sends the broadcast message, if the start time of the next round of Trigger access process of the AP reservation is reached, the AP sends a Trigger frame to the STA to start the Trigger access process.
  • an embodiment of the present invention provides another channel access method, which may be applied to a WLAN.
  • step 303 in FIG. 3 is that the AP sends the broadcast message, and the STA can receive after the sending
  • FIG. 4 is a method performed by one of the STAs that received the broadcast message. The main flow of the method is described below.
  • Step 401 The STA receives a broadcast message, where the broadcast message includes a time parameter of a Trigger access process.
  • Step 402 The STA determines, according to the broadcast information, a guard interval of a Trigger access process.
  • Step 403 The STA performs DCF access outside the guard interval of the Trigger access process.
  • the guard interval may be a period of time, for example, may be set from a certain time before the start time of the Trigger access process to a time after the start time of the Trigger access process.
  • the guard interval is set to avoid conflicts between the DCF access process and the Trigger access process.
  • the STA cannot access the channel in DCF mode.
  • the time parameter included in the broadcast message received by the STA includes the start time of the next round of the Trigger access process, and the STA may introduce a guard interval before and after the start time.
  • the start time is 12:00:01:112
  • the start time of the guard interval set by the STA for the start time may be 12:00:01:106
  • the end time may be 12:00:01:118. .
  • the interval can be introduced before and after the start time of the Trigger access process.
  • the above example is that the interval introduced before and after the start time of the Trigger access process is the same (both 6 milliseconds).
  • the interval introduced before and after the start time of the Trigger access process may not be The same, depending on the actual situation or the system preset.
  • the above values are only For example, it does not represent the actual situation.
  • the DCF access is performed outside the guard interval of the Trigger access procedure, that is, DCF access is performed when the Trigger access is not performed.
  • the current time is 12:00:01:108
  • the start time of the next round of Trigger access process is 12:00:01:112.
  • the start time of the guard interval set at the start time of the secondary Trigger access process is 12:00:01:106, that is, the guard interval has been entered, and then the STA cannot perform DCF access at this time.
  • the DCF access specifically includes:
  • the STA If the STA fails to complete the backoff before the guard interval of the Trigger access procedure, the STA records the value of the backoff counter, the DCF access is suspended, and the STA participates in the Trigger access procedure.
  • the STA may perform a backoff process corresponding to the DCF, that is, enable the backoff counter.
  • a backoff process corresponding to the DCF that is, enable the backoff counter.
  • the backoff process of the next round of the Trigger access process is reached, if the backoff process is not completed, the value of the backoff counter is recorded, the backoff process is suspended, and the trigger message sent by the receiving AP is waited for, that is, waiting
  • the Trigger access process is performed, and when the backoff process of the next round of the Trigger access process is reached, if the backoff process has ended, the DCF access of the STA is successful, and the STA does not perform Trigger access.
  • the current time is 12:00:01:100
  • the start time of the next round of Trigger access process is 12:00:01:112.
  • the start time of the guard interval set for the start time of the Trigger access process is 12:00:01:106
  • the STA can perform the backoff process and turn on the backoff counter.
  • the time of 12:00:01:106 is reached, if the backoff process has not ended, then the value of the backoff counter needs to be recorded, the backoff process is suspended, and the trigger message sent by the AP (ie, Trigger frame) is received, and
  • the time reaches 12:00:01:106 if the backoff process has ended, the STA performs DCF access successfully.
  • the DCF access is suspended, and the STA participates in the Trigger access process, specifically:
  • the STA If the STA successfully accesses the Trigger in a scheduled manner in the scheduling time slot of the Trigger, the STA cancels the DCF access and clears the value of the recorded backoff counter.
  • the STA restores the value of the backoff counter before the guard interval of the Trigger access process after the guard interval of the Trigger access process, and continues the DCF access.
  • the STA can cancel the DCF access and can set the value of the backoff counter. Cleared.
  • the STA may save from the guard interval of the Trigger access process.
  • the value of the backoff counter begins to continue counting, that is, the DCF access continues to be performed.
  • the method further includes:
  • the STA restores the value of the backoff counter before the guard interval of the Trigger access process after the guard interval of the Trigger access process, and continues. DCF access.
  • the STA fails to complete the backoff before the guard interval of the Trigger access procedure, the value of the backoff counter is recorded, and the Trigger access is awaited. However, the STA does not receive the Trigger frame sent by the AP and cannot perform the Trigger access. After the guard interval of the Trigger access process ends, for example, the STA can be at the end of the guard interval of the Trigger access process.
  • the value of the saved backoff counter begins to continue counting, that is, DCF access continues to be performed.
  • the STA has the field protection capability. Even if the Trigger access is unsuccessful, the STA can continue to perform DCF access from the state when the DCF access is suspended, thereby reducing the time required for the STA to perform DCF access. , improve DCF access efficiency.
  • the time parameter includes a start time of the Trigger access process or a time interval of a Trigger access process of different rounds.
  • the broadcast message is sent by the AP, a control frame, a management frame, or
  • the data frame carries, including: a CTS frame for responding to the sending request RTS or a BA frame for confirming successful reception of the received data, a Beacon frame or a Probe response frame, and a signaling portion in the data frame.
  • the Trigger access process is used to trigger a centralized control or scheduling process, and adopts an OFDMA mode, a CSMA mode with collision avoidance, or a hybrid access mode of the two in a centralized control phase.
  • the process of FIG. 4 is a process corresponding to the process of FIG. 3, and the content that is not described in detail in the process of FIG. 4 has been introduced in the process of FIG. 3, and therefore will not be described again.
  • FIG. 5 a sub-flowchart of a part of the process for the STA to coordinate the Trigger access and the DCF access.
  • Step 501 The STA performs a DCF backoff process in an interval of the Trigger access process. Go to step 502. Before the step 501, the STA needs to receive the broadcast message sent by the AP, where the broadcast message carries a time parameter for scheduling the next round of Trigger access process.
  • Step 502 The STA determines whether the backoff is ended before the start time of the guard interval of the next round of the Trigger access process arrives. If yes, go to step 503.
  • Step 503 If the backoff is ended before the protection time arrives, the STA directly transmits the uplink data by using a transmission mode corresponding to the DCF. The process ends.
  • step 601 of FIG. 6 a sub-flowchart of a part of the process for the STA to coordinate the Trigger access and the DCF access.
  • Step 601 If the backoff does not end before the arrival of the start time of the guard interval of the next round of the Trigger access process, the STA records the value of the backoff counter, the DCF access is suspended, and the STA participates in the Trigger access process. That is, the STA starts waiting for the AP to transmit a Trigger frame. If the STA receives the Trigger frame within the guard interval, step 602 is performed. If the STA does not receive the Trigger frame within the guard interval, step 603 is performed.
  • Step 602 If the STA receives the Trigger frame within the guard interval, the STA performs a Trigger access process.
  • Step 603 If the STA does not receive the Trigger frame within the guard interval, the STA is in the protection. After the interval, the value of the backoff counter before the guard interval of the Trigger access process is restored, and the DCF access is continued.
  • step 602 a sub-flowchart of a part of the process for the STA to coordinate the Trigger access and the DCF access. After step 602, according to whether the STA performs the Trigger access process successfully, the steps of the process of FIG. 7 are also included.
  • Step 701 After receiving the Trigger frame in the guard interval, the STA performs a Trigger access process. Step 701 and step 602 can be understood as the same step. If the STA performs the Trigger access successfully, step 702 is performed. If the STA fails to perform the Trigger access, step 703 is performed.
  • Step 702 If the STA successfully accesses the Trigger in a scheduled manner in the scheduling time slot of the Trigger, the STA cancels the DCF access.
  • Step 703 If the STA fails to access the Trigger in the scheduled time slot of the Trigger, the STA restores the value of the backoff counter before the guard interval of the Trigger access process after the guard interval, and continues the DCF access.
  • an embodiment of the present invention provides an AP, where the AP may include a scheduling module 801 and a sending module 802.
  • the scheduling module 801 is configured to schedule at least two rounds of Trigger access procedures, and send a broadcast message through the sending module 802 in the process of scheduling the current round of Trigger access, where the broadcast message includes a time parameter for scheduling a next round of Trigger access process.
  • the AP further includes a determining module for scheduling a time parameter of the next round of the Trigger access process, where the determining module is specifically configured to: according to the current round of Trigger access process The number of access conflicts or the amount of traffic, determining the time parameter of the next round of the Trigger access process, the time parameter including the start time of the next round of the Trigger access process or the current round of the Trigger access process and the next round of Trigger The time interval of the access process.
  • the start time of the next round of the Trigger access process is the end time of the Trigger access process.
  • the target start time of the next round of Trigger access process and the end of the current Trigger access process There is a time interval for the bundle time, which is used for distributed point coordination function DCF access.
  • the current round of Trigger access process is scheduled by using a management frame.
  • the broadcast message sent by the AP is carried by a control frame, a management frame, or a data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA for confirming successful reception of the received data.
  • Frame Beacon frame or Probe response frame, the signaling part of the data frame.
  • the Trigger access process is used to trigger a centralized control or scheduling process, and adopts an OFDMA mode, a CSMA mode with collision avoidance, or a hybrid access mode of the two in a centralized control phase.
  • an embodiment of the present invention provides a STA, where the STA may include a receiving module 901, a determining module 902, and an operating module 903.
  • the receiving module 901 is configured to receive a broadcast message, where the broadcast message includes a time parameter of a Trigger access process
  • a determining module 902 configured to determine, according to the broadcast information, a guard interval of a Trigger access process
  • the operation module 903 is configured to perform DCF access outside the guard interval of the Trigger access process.
  • the operation module 903 is used for DCF access, specifically:
  • the STA fails to complete the backoff before the guard interval of the Trigger access procedure, the value of the backoff counter is recorded, the DCF access is suspended, and the STA participates in the Trigger access procedure.
  • the operation module 903 is specifically used to stop the DCF access, and the STA participates in the Trigger access process, specifically:
  • the operation module 903 is further configured to: if the receiving module 901 does not receive the Trigger frame of the Trigger access process within the guard interval of the Trigger access process, the guard interval in the Trigger access process After that, the value of the backoff counter before the guard interval of the Trigger access process is restored, and the DCF access is continued.
  • the time parameter includes a start time of the Trigger access process or a time interval of a Trigger access process of different rounds.
  • the broadcast message is carried by a control frame, a management frame, or a data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming successful reception of the received data, Beacon Frame or Probe response frame, the signaling portion of the data frame.
  • the Trigger access process is used to trigger a centralized control or scheduling process, and adopts an OFDMA mode, a CSMA mode with collision avoidance, or a hybrid access mode of the two in a centralized control phase.
  • an embodiment of the present invention provides an AP, including a memory 1001, a processor 1002, and a transceiver 1003 connected to the bus 1000.
  • the memory 1001 is configured to store an instruction required by the processor 1002 to perform a task
  • the processor is configured to execute an instruction stored in the memory 1001, schedule at least two rounds of Trigger access procedures, and send a broadcast message through the transceiver 1003 during scheduling of the current round of Trigger access, the broadcast message including an appointment for the next round The time parameter of the Trigger access process.
  • the processor 1002 is further configured to reserve a time parameter of the next round of the Trigger access process, which is specifically: according to the number of access conflicts or traffic volume in the current round of Trigger access process, And determining a time parameter of the next round of the Trigger access process, where the time parameter includes a start time of the next round of the Trigger access process or a time interval between the current round of the Trigger access process and the next round of the Trigger access process.
  • the start time of the next round of the Trigger access process is the end time of the Trigger access process.
  • the number of access conflicts or the amount of traffic is less than or equal to a threshold. Then, there is a time interval between the target start time of the next round of the Trigger access process and the end time of the current Trigger access process, and the time interval is used for DCF access.
  • the current round of Trigger access process is scheduled by using a management frame.
  • the broadcast message sent by the processor 1002 by the transceiver 1003 is carried by the control frame, the management frame, or the data frame sent by the AP, and includes: a CTS frame or a CTX frame for responding to the RTS, where Confirm the BA frame, the Beacon frame or the Probe response frame, and the signaling part in the data frame.
  • the Trigger access process is used to trigger a centralized control or scheduling process, and adopts an OFDMA mode, a CSMA mode with collision avoidance, or a hybrid access mode of the two in a centralized control phase.
  • an embodiment of the present invention provides a STA including a memory 1101, a processor 1102, and a transceiver 1103 connected to a bus 1100.
  • the memory 1101 is configured to store an instruction required by the processor 1102 to perform a task
  • the transceiver 1103 is configured to receive a broadcast message, where the broadcast message includes a time parameter of a Trigger access process.
  • the processor 1102 is configured to execute an instruction stored by the memory 1101, determine a guard interval of the Trigger access process according to the broadcast information, and perform DCF access outside the guard interval of the Trigger access process.
  • the processor 1102 is used for DCF access, specifically:
  • the STA fails to complete the backoff before the guard interval of the Trigger access process, the value of the backoff counter is recorded, the DCF access is suspended, and the STA participates in the Trigger access process.
  • the processor 1102 is specifically used to stop the DCF access, and the STA participates in the Trigger access process, specifically:
  • the STA fails to access the Trigger in the scheduled time slot of the Trigger, the value of the backoff counter before the guard interval of the Trigger access process is restored after the guard interval of the Trigger access process, and the DCF access is continued. .
  • the processor 1102 is further configured to: if the transceiver 1103 does not receive the Trigger frame of the Trigger access process within the guard interval of the Trigger access process, the guard interval of the Trigger access process After that, the value of the backoff counter before the guard interval of the Trigger access process is restored, and the DCF access is continued.
  • the time parameter includes a start time of the Trigger access process or a time interval of a Trigger access process of different rounds.
  • the broadcast message is carried by a control frame, a management frame, or a data frame sent by the AP, and includes: a CTS frame for responding to the RTS or a BA frame for confirming successful reception of the received data, Beacon Frame or Probe response frame, the signaling portion of the data frame.
  • the Trigger access process is used to trigger a centralized control or scheduling process, and adopts an OFDMA mode, a CSMA mode with collision avoidance, or a hybrid access mode of the two in a centralized control phase.
  • the AP may schedule at least two rounds of the Trigger access process, and the AP may send a broadcast message in the process of scheduling the current round of Trigger access, where the broadcast message includes a time parameter for scheduling the next round of Trigger access process. Therefore, after receiving the broadcast message, the STA may wait for the triggering of the AP according to the time parameter included in the broadcast message, that is, the STA is equivalent to knowing the next round of Trigger access. The time begins so that you can wait for access at the right time.
  • the Trigger access process is an OFDMA uplink access procedure, and just because the time parameter of the subsequent Trigger access procedure is known, the STA performs the Trigger access gap (that is, after the last Trigger access procedure is completed). And DCF access can be performed before the start of the next Trigger access process, thereby minimizing the conflict between DCF access and Trigger access, so that one system can simultaneously support two uplink access technologies, then Through the DCF access, the traditional STA can be ensured to access the AP, and the Trigger access can increase the uplink as much as possible. The efficiency of access makes the uplink access process of STAs in the system more efficient and reliable.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit or unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present application in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • a processor to perform the embodiments of the present application. All or part of the steps of the method.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

Abstract

La présente invention concerne un domaine technique de la communication sans fil, et en particulier un procédé et un dispositif d'accès au canal. La présente invention aborde un problème technique lié à une faible efficacité d'accès de liaison montante. Dans un mode de réalisation de la présente invention, un point d'accès (AP) peut programmer un paramètre temporel d'un processus d'accès de déclenchement pour une boucle à venir. Par la suite, une station (STA) peut effectuer l'accès de déclenchement en fonction d'une indication d'AP, et effectuer un accès de fonction de coordination distribuée (DCF) dans un intervalle de temps en effectuant les accès de déclenchement, ce qui permet d'améliorer une efficacité d'accès de liaison montante.
PCT/CN2015/073222 2015-02-17 2015-02-17 Procédé et dispositif d'accès au canal WO2016131191A1 (fr)

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CN201580071168.4A CN107211453B (zh) 2015-02-17 2015-02-17 一种信道接入方法及信道接入装置

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