WO2019085900A1 - 应答帧延迟时长设置方法、装置及系统 - Google Patents

应答帧延迟时长设置方法、装置及系统 Download PDF

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Publication number
WO2019085900A1
WO2019085900A1 PCT/CN2018/112709 CN2018112709W WO2019085900A1 WO 2019085900 A1 WO2019085900 A1 WO 2019085900A1 CN 2018112709 W CN2018112709 W CN 2018112709W WO 2019085900 A1 WO2019085900 A1 WO 2019085900A1
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Prior art keywords
sta
response frame
frame
delay
delay duration
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PCT/CN2018/112709
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English (en)
French (fr)
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陈国海
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华为技术有限公司
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Priority to JP2020524630A priority Critical patent/JP7027539B2/ja
Priority to EP18873893.4A priority patent/EP3694248A4/en
Priority to KR1020207014983A priority patent/KR102387006B1/ko
Publication of WO2019085900A1 publication Critical patent/WO2019085900A1/zh
Priority to US16/862,034 priority patent/US20200259602A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a method, an apparatus, and a system for setting a response frame delay duration.
  • multiple input and multiple outputs are used in several emerging wireless communication standards such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.
  • MIMO Multiple-Input Multiple-Output
  • STAs mobile stations
  • APs access points
  • the STA when the STA receives the data packet (Packet) sent by the AP, the STA needs to notify the AP that the data frame has been received by feeding back an acknowledgement frame (ACK) to the AP.
  • Packet data packet
  • ACK acknowledgement frame
  • FIG. 1A is a schematic diagram showing a conflict between a response frame and a response frame according to an exemplary embodiment of the present application. As shown in FIG. 1A, when an AP receives a response frame fed back by multiple STAs at the same time, the AP receives the response frame. Conflicts (interference) occur between the response frames.
  • FIG. 1B is a schematic diagram showing a conflict between a response frame and a data frame provided by an exemplary embodiment of the present application. As shown in FIG. 1B, when an AP sends a data frame to STA1, it receives an acknowledgement frame fed back by STA2. When there is a collision (interference) between the response frame and the data frame.
  • the interference generated between the data may cause the AP to erroneously determine that the response frame sent by the STA is not received, that is, the data frame sent to the STA is lost, so that the AP subsequently polls the STA whether to receive the data frame, thereby causing the wireless communication resource. Waste.
  • the present application discloses a method and apparatus for setting a response frame delay duration, which can solve the problems in the related art.
  • the technical solution is as follows:
  • the first aspect provides a method for setting a response frame delay duration, which is applied to a network device, where the method includes:
  • the first indication frame carrying the delay period of the first response frame is sent to the first STA by the network device, so that the first STA receives the first STA associated with the first STA.
  • the delay time of the first response frame is delayed, and the response frame is sent back to the first AP.
  • the delay time of the response frame of the same group of STAs is usually different, so that the same AP does not receive the same group STA.
  • the response frame avoids the AP from erroneously determining that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding the wireless communication.
  • the wasteful effect of resources avoids the AP from erroneously determining that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding the wireless communication.
  • the method further includes: acquiring a second response frame delay duration corresponding to the second STA, The second STA and the first STA are the same group of STAs; and the second STA sends a second indication frame that carries the delay time of the second response frame, so that the second STA receives the data.
  • the second response frame is postponed for a delay period and then the response frame is fed back.
  • the MIMO controller is based on the tolerance of the first STA to the network delay, at the first The first STA is randomly allocated to the first STA to delay the delay of the first response frame, the network device is a MIMO controller, and the first response frame delay corresponding to the first mobile station STA is obtained.
  • the method further includes: allocating a first response frame delay duration to the first STA; and sending, by the first STA, a first indication frame that carries the first response frame delay duration, including: Transmitting the first response frame delay duration to the first access point AP, and forwarding, by the first AP, the first response frame delay duration to the first STA, where the first AP is the first STA associated with the AP.
  • the MIMO controller can set the response separately The number of times the frame delay is used, thereby controlling the number of times the response frame is delayed after the STA receives the data frame. Therefore, after the first STA is allocated the delay time of the first response frame, the method further includes: setting the location Determining the number of times of use of the first response frame delay duration; transmitting the number of uses to the first AP, and forwarding, by the first AP, the number of uses to the first STA.
  • the STA usually needs a minimum interval after receiving the data frame.
  • the frame interval Short Inter Frame Space, SIFS
  • SIFS Short Inter Frame Space
  • the acknowledgment timeout period of the AP is set for the minimum frame interval. Therefore, when the MIMO controller allocates the response frame delay time for each STA, it needs to The acknowledgment timeout period corresponding to each STA is set according to the delay frame delay time of each STA, so as to prevent the AP from prematurely determining data loss and starting the retransmission process, that is, the network device is the first AP, and the first mobile is acquired.
  • the method further includes: receiving a first acknowledge timeout duration corresponding to the first STA sent by the MIMO controller, and timeout the first STA and the first acknowledgement The time length is added to the correspondence between the pre-stored STA and the acknowledgment timeout period; and the delay time of the first response frame corresponding to the first STA is set according to the first acknowledgment timeout period, When said first acknowledgment time frame longer than the length of the first response delay.
  • the network can be effectively reduced.
  • the first indication frame that carries the delay of the first response frame is sent to the first STA, and the sending, by the first STA, the first response frame is sent to the first STA.
  • a first indication frame of a delay duration, the aggregated frame further comprising a data frame.
  • the method further includes: after transmitting the data frame to the first STA And if the data frame fed back by the first STA is not received within the first acknowledgement timeout period, resending the data frame to the first STA.
  • the acknowledgment timeout period of the STA is a response frame delay of the MIMO controller based on the STA Set the duration, so in order to prevent the MIMO controller from canceling the STA's acknowledgment timeout period, the AP prematurely judges the data loss to start the retransmission process.
  • the method further includes: when receiving the first acknowledge timeout duration cancel message sent by the first STA by the MIMO controller, sending the first response frame to the first STA The delay duration cancels the message, so that the first STA deletes the stored delay time of the first response frame; and deletes the first STA and the first acknowledge timeout duration in the correspondence.
  • a second aspect provides a method for setting a response frame delay duration, which is applied to a first STA, where the method includes:
  • the response frame is fed back to the first AP.
  • the first indication frame carrying the delay period of the first response frame is sent to the first STA by the network device, so that the first STA receives the first STA associated with the first STA.
  • the delay time of the first response frame is delayed, and the response frame is sent back to the first AP.
  • the delay time of the response frame of the same group of STAs is usually different, so that the same AP does not receive the same group STA.
  • the response frame avoids the AP from erroneously determining that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding the wireless communication.
  • the wasteful effect of resources avoids the AP from erroneously determining that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding the wireless communication.
  • the first frame sent by the first AP is received because the aggregated frame saves the overhead of the frame preamble and the header, and the network overhead is effectively reduced.
  • the frame includes: receiving an aggregated frame sent by the first AP, obtaining a first indication frame and a data frame included in the aggregated frame, and delaying the delay of the first response frame, and then feeding back to the first AP Answer frame.
  • the MIMO controller can control the delay time of the response frame by separately setting the number of times of use The number of times the response frame is delayed after the STA receives the data frame.
  • the first indication frame further carries the number of times of use of the delay time of the first response frame, where the first indication frame further carries the The number of times of use of the delay time of the first response frame, the first indication frame further carrying the number of times of use of the delay time of the first response frame, where the acquiring and storing the The delay time of the first response frame corresponding to the first STA includes: acquiring and storing, corresponding to the delay time of the first response frame corresponding to the first STA carried in the first indication frame, and the delay duration of the first response frame The number of times of use; after the delay of the delay period of the first response frame, the feedback of the response frame to the first AP includes: using the stored delay time of the first response frame for the duration of use If the number of times of use of the first response frame delay time is less than 0, the number of times of use of the first response frame delay duration and the first response frame delay duration is deleted, and the default delay duration is postponed.
  • the response frame is fed back to the first AP; if the number of times of using the delay time of the first response frame after the decrement of 1 is not less than 0, the delay of the delay of the first response frame is delayed, and the response is sent to the first AP. Answer frame.
  • a third aspect provides a response frame delay duration setting apparatus, which is applied to a network device, where the apparatus includes:
  • An acquiring module configured to acquire a delay time of a first response frame corresponding to the first mobile station STA
  • a sending module configured to send the first response frame delay duration to the first STA, so that when the first STA receives the data frame, delaying the first response frame delay duration and then feeding back the response frame.
  • a fourth aspect provides a response frame delay duration setting apparatus, which is applied to a first STA, where the apparatus includes:
  • a receiving module configured to receive a first indication frame sent by the first AP, and obtain and store a delay time of the first response frame corresponding to the first STA that is carried in the first indication frame, where the first AP is the The AP associated with the first STA;
  • the feedback module is configured to feed back the response frame to the first AP after delaying the delay period of the first response frame, when the data frame sent by the first AP is received.
  • a network device comprising a processor and a memory, the memory storing at least one instruction, the at least one instruction being loaded and executed by the processor to implement the first aspect described above
  • the response frame delay duration is set by the corresponding steps involved in the method.
  • a first STA is provided, where the first STA includes a processor and a memory, where the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the foregoing.
  • a response frame delay duration setting system comprising a network device and a STA;
  • the network device includes the response frame delay duration setting device according to the third aspect; or the network device includes the network device as described in the fifth aspect;
  • the STA includes the response frame delay duration setting apparatus according to the fourth aspect; or the STA includes the first STA as described in the sixth aspect.
  • a computer readable storage medium stores at least one instruction, and at least one instruction is loaded and executed by a processor to implement any one of the possible implementations of the first aspect described above.
  • the method of setting the response frame delay duration provided.
  • a ninth aspect a computer readable storage medium having stored therein at least one instruction, the at least one instruction being loaded and executed by a processor to implement any one of the possible implementations of the second aspect above The response frame delay duration setting method.
  • FIG. 1A is a schematic diagram of a conflict between a response frame and a response frame according to an exemplary embodiment of the present application
  • FIG. 1B is a schematic diagram of a conflict between a response frame and a data frame provided by an exemplary embodiment of the present application
  • 2A is a schematic diagram of a system architecture of a response frame delay duration setting system applied to an embodiment of the present application
  • 2B is a schematic diagram of a connection manner between an AP and a MIMO controller applied in an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a network device to which an exemplary embodiment of the present application is applied;
  • FIG. 4 is a schematic structural diagram of an STA applied to an exemplary embodiment of the present application.
  • FIG. 5A is a flowchart of a method for setting a response frame delay duration provided by an exemplary embodiment of the present application
  • FIG. 5B is a schematic diagram of a response frame and a response frame received by a first AP according to an exemplary embodiment of the present application
  • FIG. 6 is a flowchart of a method for setting a response frame delay duration provided by another exemplary embodiment of the present application.
  • FIG. 7 is a flowchart of a method for setting a response frame delay duration provided by another exemplary embodiment of the present application.
  • FIG. 8 is a flowchart of a method for setting a response frame delay duration according to still another exemplary embodiment of the present application.
  • FIG. 9 is a schematic diagram of comparison between an existing data transmission process provided by an exemplary embodiment of the present application and a data transmission process according to the present application;
  • FIG. 10 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 11 is a simplified schematic diagram of a possible design structure of a STA involved in the embodiment of the present application.
  • FIG. 12A is a block diagram of an apparatus for setting a response frame delay duration according to an embodiment of the present application.
  • 12B is a block diagram of an apparatus for setting a response frame delay duration according to an embodiment of the present application.
  • FIG. 13A is a block diagram of an apparatus for setting a response frame delay duration according to another embodiment of the present application.
  • FIG. 13B is a block diagram of an apparatus for setting a response frame delay duration according to another embodiment of the present application.
  • 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.
  • FIG. 2A is a schematic diagram of a system architecture of a response frame delay duration setting system applied to an embodiment of the present application.
  • the response frame delay duration setting method according to the present application is applied to the response frame delay duration setting system.
  • the response frame delay duration setting system includes: a plurality of network devices and a plurality of STAs, wherein the network device includes at least one MIMO controller and at least one AP.
  • the AP and the STA are connected by a wireless connection, and the AP and the MIMO controller are connected through a switch, wherein the switch performs a wired/wireless connection with the AP and the MIMO controller respectively, and the wired connection includes an optical fiber and an Ethernet connection.
  • FIG. 2B shows the connection manner between the AP and the MIMO controller applied in one embodiment of the present application.
  • Schematic diagram The AP and the MIMO controller are connected through a switch (as shown in Figure 2B (1), both AP1 and AP2 are connected to the MIMO controller through a switch), and can also be connected through multiple switches (as shown in Figure 2B (2).
  • AP2 is connected to the MIMO controller through two switches; as shown in Figure 2B(3), AP2 is connected to the MIMO controller through three switches.
  • each switch can be directly connected (as shown in Figure 2B (2), switch 1 is directly connected to switch 2; as shown in Figure 2B (3)
  • the switch 3 is directly connected to the switch 1 and the switch 2, respectively, and can also be connected through a router (as shown in FIG. 2B (4), the switch 1 and the switch 2 are connected through the router 1).
  • the connection between the switches and between the switch and the router is a wired/wireless connection.
  • the MIMO controller can be a standalone device or integrated into an Access Point Controller (AC).
  • AC Access Point Controller
  • the MIMO controller When the MIMO controller is a stand-alone device, the MIMO controller usually runs on a general-purpose computer, such as running on a computer's Central Processing Unit (CPU), performing hardware (such as CPU hard core, graphics).
  • CPU Central Processing Unit
  • a processor Graphics Processing Unit (GPU), Field-Programmable Gate Array (FPGA)
  • the MIMO controller is usually used as a functional module of the AC, wherein
  • the communication between the MIMO controller and the AP is performed by using a communication tunnel between the AP and the AC.
  • FIG. 3 shows a schematic structural diagram of a network device to which an exemplary embodiment of the present application is applied.
  • the network device includes a processor 31, a network interface 32, a cache 33, a memory 34, and a bus 35.
  • the processor 31 includes one or more processing cores, and the processor 31 executes various functional applications and data processing by running software programs and modules.
  • the network interface 32 is used for the network device to communicate with other network devices.
  • the memory 34 and the cache 33 are connected to the processor 31 via a bus 35, respectively.
  • Memory 34 can be used to store software programs as well as modules.
  • the memory 34 can store an application module 36 required for at least one function, and the application module 36 includes at least an acquisition module program 361, a transmission module program 362, a setting module program 363, a receiving module program 364, and a deletion module program 365.
  • the obtaining module program 361 is configured to obtain a delay time of the first response frame corresponding to the first mobile station STA, and obtain a delay time of the second response frame corresponding to the second STA, where the second STA and the first STA are the same group of STAs.
  • the sending module program 362 is configured to send, to the first STA, a first indication frame that carries a delay time of the first response frame, so that the first STA delays the response frame after the delay of the first response frame when receiving the data frame; Transmitting, by the second STA, a second indication frame carrying a delay duration of the second response frame, so that the second STA delays the delay of the second response frame after receiving the data frame, and then feeding back the response frame; to the first access point AP Sending a delay time of the first response frame, the first AP forwards the delay time of the first response frame to the first STA, where the first AP is the AP associated with the first STA, and the number of times of use is sent to the first AP, which is used by the first AP.
  • the number of times is forwarded to the first STA; the first indication frame carrying the delay time of the first response frame is sent to the first STA in the form of an aggregated frame, and the aggregated frame further includes the data frame; after the data frame is sent to the first STA, if If the data frame fed back by the first STA is not received within the first acknowledgment timeout period, the data frame is retransmitted to the first STA; when the first acknowledgment timeout period of the first STA sent by the MIMO controller is received, the message is cancelled.
  • One STA sends the first response
  • the frame delay duration cancels the message to cause the first STA to delete the stored first response frame delay duration.
  • the setting module program 363 is configured to allocate a first response frame delay duration to the first STA before acquiring the first response frame delay duration corresponding to the first mobile station STA; after allocating the first response frame delay duration to the first STA, The first acknowledgement timeout duration is set according to the first acknowledgement timeout duration, and the first acknowledgement timeout duration is greater than the first responseframe delay duration.
  • the receiving module program 364 is configured to receive a first acknowledgment timeout period corresponding to the first STA sent by the MIMO controller, and time out the first STA and the first acknowledgment before acquiring the first acknowledgment frame delay duration corresponding to the first mobile station STA. The duration is added to the correspondence between the pre-stored STA and the acknowledgment timeout period.
  • the delete module program 365 is configured to delete the first STA and the first acknowledge timeout duration in the correspondence.
  • the memory 34 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.
  • 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 or Optical Disk.
  • FIG. 3 does not constitute a limitation of the network device, and may include more or less components than those illustrated, or combine some components, or different components. Arrangement.
  • FIG. 4 is a schematic structural diagram of a first STA applied to an exemplary embodiment of the present application.
  • the first STA includes a processor 41, a network interface 42, a cache 43, a memory 44, and a bus 45.
  • the processor 41 includes one or more processing cores, and the processor 41 executes various functional applications and data processing by running software programs and modules.
  • the network interface 42 is used for the network device to communicate with other network devices.
  • the memory 44 and the cache 43 are connected to the processor 41 via a bus 45, respectively.
  • Memory 44 can be used to store software programs as well as modules.
  • the memory 44 can store an application module 46 required for at least one function, and the application module 46 includes at least a receiving module program 461, a feedback module program 462, a deletion module program 463, and a calculation module program 464.
  • the receiving module program 461 is configured to receive the first indication frame sent by the first AP, and obtain and store the delay time of the first response frame corresponding to the first STA carried in the first indication frame, where the first AP is the AP associated with the first STA. Obtaining and storing the first response frame delay duration and the first response frame delay duration corresponding to the first STA carried in the first indication frame.
  • the feedback module program 462 is configured to: when the data frame sent by the first AP is received, delay the delay time of the first response frame, and then feed back the response frame to the first AP; delay the corresponding number of times of the stored first response frame delay duration If the number of times of use of the first response frame delay time is less than 0, the number of times of the first response frame delay duration and the first response frame delay duration is deleted, and the default delay duration is delayed.
  • An AP feedback response frame if the usage time of the first response frame delay duration after subtracting 1 is not less than 0, delaying the delay period of the first response frame, and feeding back the response frame to the first AP.
  • the deleting module program 463 is configured to: when receiving the first response frame delay duration cancellation message sent by the first AP, the first STA deletes the stored first response frame delay duration.
  • the calculation module program 464 is configured to: when the data frame sent by the first AP is received, the first STA reduces the number of times of use of the stored first response frame delay duration by one.
  • the memory 44 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.
  • 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 or Optical Disk.
  • first STA does not constitute a limitation of the first STA, may include more or less components than illustrated, or combine some components, or different. Parts layout.
  • FIG. 5A is a flowchart of a method for setting a response frame delay duration provided by an exemplary embodiment of the present application. This embodiment is illustrated by using the method in the system architecture of the response frame delay duration setting system shown in FIG. 2A. As shown in FIG. 5A, the method includes the following steps:
  • Step 501 The network device acquires a delay duration of the first response frame corresponding to the first STA.
  • the network device is a MIMO controller or a first AP, and the first AP is an AP associated with the first STA.
  • the network device When the network device is a MIMO controller, the network device allocates a first response frame delay duration to the first STA before acquiring the first response frame delay duration corresponding to the first STA.
  • the MIMO controller allocates a corresponding first response frame delay duration to the first STA according to the network delay condition of the first STA.
  • the network device When the network device is the first AP, the network device receives the first response frame delay duration corresponding to the first STA sent by the MIMO controller.
  • the first STA sends an association request to the first AP. After the first AP receives the association request sent by the first STA, it determines that the first STA wants to associate with the first AP.
  • the first response frame is delayed by the duration.
  • Step 502 The network device sends, to the first STA, a first indication frame that carries a delay duration of the first response frame.
  • the network device When the network device is a MIMO controller, the network device sends a first response frame delay duration to the first AP, and the first AP forwards the first response frame delay duration to the first STA.
  • the network device When the network device is the first AP, the network device sends, to the first STA, a first indication frame that carries a delay time of the first response frame.
  • the first indication frame carrying the delay period of the first response frame uses the management frame subtypes of 1101 (Action) and 1110 (Action No ACK), and the difference between the two is that when the first STA receives the Action frame, it needs to The first AP replies to the response frame, and the first STA does not need to reply to the first AP when receiving the Action No ACK frame.
  • the Action frame is good for providing reliable transmission, and the Action No ACK frame is good for reducing network overhead.
  • the following is a description of the first indication frame as the Action type.
  • the Action No ACK type is similar to the Action type, and is not described in this embodiment.
  • the Action frame contains two main fields, one is a Category field, the Category field is used to indicate the specific subtype of the Action frame, and the second is the Action Details field, which is used to describe the Action frame.
  • Table 1 shows the possible values of code in the category field of the Action frame.
  • the category of the Action frame may use any value in the code that is not defined by the existing protocol or agreed upon.
  • the code in the category of the Action frame is 16.
  • the first AP may form an aggregate frame after the first indication frame and the data frame are sent when the data frame is sent to the first STA. Sending to the first STA, because the aggregated frame saves overhead such as frame preamble and header, it can effectively reduce network overhead.
  • the step 502 may be replaced by: the first AP sending, in the form of an aggregated frame, the first indication frame carrying the delay time of the first response frame to the first STA, where the aggregated frame further includes the data frame. .
  • the first indication frame and the data frame are aggregated by aggregating an Aggregate MAC Protocol Data Unit (A-MPDU).
  • A-MPDU Aggregate MAC Protocol Data Unit
  • the first AP determines that the first response frame is delayed by the first STA
  • two data frames need to be sent to the first STA, and then the two data frames are aggregated to obtain downlink data, as shown in Table 2.
  • Table 3 shows the location where the first indication frame and the data frame are aggregated and the first indication frame may be located in the data frame. It should be noted that this embodiment does not limit the position of the first indication frame in the data frame.
  • the data frame and the first indication frame are aggregated and sent to the MIMO controller, and the aggregated frame can save overhead such as frame preamble and header. Can effectively reduce network overhead.
  • the step of transmitting the first indication frame may be omitted, thereby reducing network overhead.
  • Step 503 The first STA receives the first indication frame sent by the first AP, and acquires and stores the delay time of the first response frame corresponding to the first STA carried in the first indication frame.
  • the first STA when the first AP sends the first indication frame carrying the delay of the first response frame to the first STA in the form of an aggregated frame, the first STA receives the aggregated frame sent by the first AP, and obtains the aggregated frame. After the first indication frame and the data frame are included, and the delay time of the first response frame is delayed, the response frame is fed back to the first AP.
  • Step 504 When receiving the data frame sent by the first AP, the first STA delays the delay period of the first response frame, and then feeds back the response frame to the first AP.
  • the response frame delay time corresponding to each STA is usually different. After each STA receives the data frame sent by the first AP, each STA delays the delay time of the corresponding response frame, and then feeds back the response frame to the first AP. Since the time interval between each STA receiving the data frame and the acknowledgment to send the response frame to the first AP is small or even 0, the first AP does not need to send a query request to each STA, so that a large number of block acknowledgment requests can be effectively saved (Block After the Acknowledgment Request (BAR), the SIFS between the BAR and the Block Acknowledgment (BA), the backoff time between the response frames, and the data collision cause the message to be retransmitted, the first AP receives the STA reply reply frame again. time.
  • BAR Acknowledgment Request
  • BA Block Acknowledgment
  • BA Block Acknowledgment
  • FIG. 5B is a schematic diagram showing a response frame and a response frame received by the first AP according to an exemplary embodiment of the present application, where the first AP sets the response frame delay time corresponding to STA1 to be 16 us, and the STA2 corresponds to the response.
  • the frame delay is 40us.
  • the first AP sends data frames to STA1 and STA2 at the same time.
  • the data stream length is 500us.
  • STA1 delays 16us and feeds back the response frame to the first AP.
  • STA2 receives the frame. After delaying 40us after the data frame, the response frame is fed back to the first AP.
  • the first indication frame carrying the delay period of the first response frame is sent to the first STA by the network device, so that the first STA receives the first STA associated with the first STA.
  • the delay time of the first response frame is delayed, and the response frame is sent back to the first AP.
  • the delay time of the response frame of the same group of STAs is usually different, so that the same AP does not receive the same group STA.
  • the response frame avoids the AP from erroneously determining that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding the wireless communication.
  • the wasteful effect of resources avoids the AP from erroneously determining that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding the wireless communication.
  • the STA after receiving a data frame, the STA usually needs to send a response frame to the first AP after being separated by one SIFS. Since the acknowledgement timeout time of the first AP is set for the minimum frame interval, when each STA is assigned a response, After the frame delay period is long, the acknowledgment timeout period of the first AP for each STA is also set according to the delay frame delay time of each STA, so as to prevent the first AP from prematurely determining data loss to start the retransmission process.
  • FIG. 6 is a flowchart of a method for setting a response frame delay duration provided by another exemplary embodiment of the present application.
  • This embodiment is exemplified by the method used in the system architecture of the response frame delay duration setting system shown in FIG. 1, and the method includes the following steps:
  • Step 601 The first AP receives the first acknowledgment timeout period corresponding to the first STA sent by the MIMO controller, and adds the first STA and the first acknowledgment timeout period to the corresponding relationship between the pre-stored STA and the acknowledgment timeout duration.
  • the first AP receives the first response frame delay time corresponding to the first STA sent by the MIMO controller, and the first acknowledgement timeout period corresponding to the first STA is 100 us.
  • the MIMO controller may set different acknowledgment timeout durations for different STAs, and may also set the same acknowledgment timeout duration for different STAs.
  • the acknowledgment timeout period is longer than the response frame delay duration corresponding to the STA with the longest response frame delay duration.
  • Table 4 shows that the MIMO controller can set different acknowledgment timeout durations for different STAs connected to the same AP.
  • Table 5 shows that the MIMO controller can set the same acknowledgment timeout period for different STAs connected to the same AP.
  • the MIMO controller sends the first acknowledge timeout duration corresponding to the first STA to the first AP in a TLV format.
  • the first AP after receiving the first acknowledgment timeout period corresponding to the first STA sent by the MIMO controller, the first AP feeds back an acknowledgment setting message to the MIMO controller.
  • the first AP may reply to the MIMO controller with a complex acknowledgement message carrying the first STA related information.
  • the first AP may also reply to the MIMO controller with a short acknowledgement message that does not carry the original settings.
  • the first acknowledgment timeout period and the first acknowledgment frame delay duration corresponding to the first STA sent by the MIMO controller to the first AP the MAC address of the first STA is 0x0A1122334455, and the delay time of the first response frame is 50us
  • the first confirmation timeout period is 100us.
  • the MIMO controller sends a setting message carrying the first acknowledgment timeout period and does not need the first AP feedback acknowledgment setting message to the first AP.
  • Table 6 shows the message format possible for setting the message. (Time unit is: us)
  • the MIMO controller sends a setting message carrying the first acknowledgment timeout period and requiring the first AP to feed back a complex acknowledgment message to the first AP.
  • Table 7 shows the message format possible for setting the message. (Time unit is: us)
  • the MIMO controller sends a setting message carrying the first acknowledgment timeout period and requiring the first AP to feed back a short acknowledgment message to the first AP, and Table 8 shows a message format possible for setting the message. (Time unit is: us)
  • the possible message format of the complex acknowledgement message fed back by the first AP is as shown in Table 9. (Time unit is: us)
  • the possible message format of the short acknowledgement message fed back by the first AP is as shown in Table 10. (Time unit is: us)
  • Type Len Value 00 (message type) 1 2 (indicating a brief confirmation reply) 01 (message identification) 2 Message ID 05 1 0 ... ... ...
  • the first AP feeds back a confirmation setting message to the MIMO controller in a TLV format.
  • the acknowledgment timeout period of each STA is set by the first AP associated with each STA in addition to being set by the MIMO controller: the first AP receives the first STA corresponding to the MIMO controller. Setting a delay time of the first response frame, setting a first acknowledge timeout period corresponding to the first STA according to the delay time of the first response frame, and adding the first STA to the first acknowledge timeout duration to the pre-stored STA and the confirmation timeout duration In the relationship.
  • the first acknowledgement timeout period is greater than the first response frame delay duration.
  • Step 602 The first AP sets a delay time of the first response frame corresponding to the first STA according to the first acknowledge timeout duration.
  • the first AP receives the first acknowledgment timeout period corresponding to the first STA sent by the MIMO controller, and the first acknowledgment frame delay time corresponding to the first STA is set to 80 us.
  • the first response frame delay duration corresponding to the first STA may be set by the MIMO controller in addition to being set by the first AP: the first AP receives the first corresponding to the first STA sent by the MIMO controller. The delay time of the response frame is delayed, and the delay time of the first response frame is sent to the first STA.
  • Step 603 The first AP sends, to the first STA, a first indication frame that carries a delay duration of the first response frame.
  • Step 604 The first STA receives the first indication frame sent by the first AP, and acquires and stores the delay time of the first response frame corresponding to the first STA carried in the first indication frame.
  • Step 605 The first AP sends a data frame to the first STA.
  • the first AP and the first STA are respectively configured with two interfaces, which are respectively a first interface and a second interface, where the power consumption of the first interface is greater than the power consumption of the second interface.
  • the first AP sends the first indication frame and the data frame to the STA through the first interface, and uses the second interface to monitor and receive the response frame fed back by each STA, thereby achieving the purpose of reducing the power consumption of the first AP.
  • the first STA is configured to feed back a response frame to the first AP
  • the second interface is configured to monitor and receive the indication frame and the data frame sent by each first AP, where the power consumption of the first interface is greater than the second. The power consumption of the interface, so as to reduce the power consumption of the first STA.
  • the first AP when the first AP enters the dormant state, the first AP performs monitoring by using the second interface, and when the first AP monitors the PS-Poll frame sent by the first STA, The first STA feeds back the response frame.
  • the response frame may be immediately fed back to the first STA, or the environment may allow the response frame to be fed back to the first STA, and may also be in an idle state.
  • the response frame is fed back to the first STA. This embodiment does not limit the timing at which the first AP feeds back the response frame to the first STA.
  • the first STA when the first STA enters a dormant state, the first STA performs monitoring by using the second interface, and when the first STA monitors the wake-up frame sent by the first AP, delays the first response frame delay. After the duration, the response frame is fed back to the first AP through the second interface.
  • the first AP may avoid sending the data frame or the indication frame to the multiple STAs at different times. A case where a plurality of STAs simultaneously feed back a response frame to the first AP.
  • the first AP adds the delay time of the first STA to the first response frame to be added to the correspondence between the pre-stored STA and the response frame delay duration. Meanwhile, before step 803, the first AP needs to perform the following steps:
  • S2 if it is necessary to send data to other STAs at the same time, it is determined whether there is a STA with the same response frame delay duration in the STAs that need to simultaneously send the data frame according to the correspondence between the pre-stored STA and the response frame delay duration;
  • the STAs are sequentially sent to the STAs with the same delay time of the response frame; or if there is a corresponding STA in the STA that needs to simultaneously send the data frame
  • the STAs with the same response frame delay duration first set the response frame delay duration of the STAs with the same delay duration of the response frame to different response frame delay durations, and then transmit the data frame to the STA that resets the response frame delay duration.
  • the response frame delay duration in the first indication frame is replaced by the locally stored response frame delay duration.
  • the first STA stores the response frame delay time of 90 us.
  • the delay time of the response frame carried in the first indication frame is obtained. 120us, and 120us instead of 90us for storage.
  • step S4 the response frame delay duration of the STA may be reset by the MIMO controller, and the response frame delay duration of the STA may be reset by the AP.
  • the embodiment does not limit the specific value of the time interval in which the data frames are sent sequentially.
  • Step 606 When receiving the data frame sent by the first AP, the first STA delays the delay period of the first response frame, and then feeds back the response frame to the first AP.
  • Step 607 After the data frame is sent to the first STA, if the first AP does not receive the data frame fed back by the first STA within the first acknowledge timeout period, the data frame is retransmitted to the first STA.
  • the first AP determines that the data frame sent to the STA is lost, and the first AP retransmits the data frame to the first STA.
  • the first indication frame carrying the delay time of the first response frame is sent to the first STA by the network device, so that the first STA sends the first AP that is associated with the first STA.
  • the response frame of the same group is sent back to the first AP.
  • the AP erroneously determines that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding waste of wireless communication resources. effect.
  • the acknowledgment timeout period of the first AP for each STA is also set according to the delay frame delay duration of each STA, thereby preventing the first AP from judging prematurely. Data loss initiates the resend process.
  • the MIMO controller may actively send a first acknowledge timeout duration cancel message to the first AP according to requirements (such as after the network MIMO phase ends) to control the first AP to cancel the first The acknowledgment timeout period of a part or all STAs connected to an AP.
  • Step 608 When receiving the first acknowledgment timeout cancellation message sent by the first STA sent by the MIMO controller, the first AP sends a first response frame delay duration cancellation message to the first STA.
  • the acknowledgment timeout period of the STA is set by the MIMO controller based on the delay frame delay time of the STA.
  • the first AP prematurely determines the data loss to initiate the retransmission process, in the first AP.
  • the delay time of the response frame of the first STA needs to be canceled, so that both the first STA and the first AP are restored to the default mechanism.
  • the first confirmation timeout duration cancellation message may have at least two message formats:
  • the first one is shown in Table 11.
  • the message format of the first acknowledgment timeout cancellation message adopts a new coding mode.
  • the first AP after the first AP deletes the first STA and the first acknowledge timeout duration in the correspondence, the first AP feeds back a confirmation cancellation message to the MIMO controller.
  • the first AP may reply to the MIMO controller with a complex acknowledgement message carrying the first STA related information.
  • the first AP may also reply to the MIMO controller with a short acknowledgement message that does not carry the original settings.
  • the second type is as shown in Table 14.
  • the message format of the first acknowledgment timeout cancellation message is in the message format of the setup message, but the first acknowledgment timeout duration is set to zero.
  • the first AP When the first AP receives the first acknowledgment timeout cancellation message sent by the MIMO controller, the first acknowledgment timeout duration (0 us) carried in the first acknowledgment timeout cancellation message is deleted, and the first AP is deleted in the corresponding relationship.
  • the first STA and the first acknowledgment timeout period When the first AP receives the first acknowledgment timeout cancellation message sent by the MIMO controller, the first acknowledgment timeout duration (0 us) carried in the first acknowledgment timeout cancellation message is deleted, and the first AP is deleted in the corresponding relationship.
  • the first STA and the first acknowledgment timeout period When the first AP receives the first acknowledgment timeout cancellation message sent by the MIMO controller, the first acknowledgment timeout duration (0 us) carried in the first acknowledgment timeout cancellation message is deleted, and the first AP is deleted in the corresponding relationship.
  • the first STA and the first acknowledgment timeout period When the first AP receives the first acknowledgment timeout cancellation message sent by the MIMO controller, the first acknowledgment timeout duration (0 us) carried in
  • the first AP feeds back a confirmation cancellation message to the MIMO controller.
  • Type Len Value 00 (message type) 1 2 (indicating a brief set reply) 01 (message identification) 2 Message ID ... ... ...
  • the MIMO controller sends a first acknowledge timeout duration cancel message to the first AP in a TLV format, and the first AP feeds back an acknowledgement cancellation message to the MIMO controller in a TLV format.
  • the message type of the first response frame delay duration cancellation message is a first indication frame of the carried response frame delay duration of 0.
  • the message type of the first response frame delay duration cancellation message is an Action frame.
  • the Action frame that defines the category field is 16 and the description field is 3 is the first indication frame of the cancellation response frame delay duration.
  • the first acknowledge timeout period of the first STA sent by the MIMO controller is received, the first message is cancelled.
  • the AP sends an action frame with a category field of 16 and a description field of 3 to the first STA.
  • Step 609 When receiving the first response frame delay time cancellation message sent by the first AP, the first STA deletes the stored first response frame delay duration.
  • the first STA restores the default mechanism, that is, when the data frame sent by the first AP is received, the response frame is fed back to the first AP after the SIFS.
  • the first STA after deleting the stored first response frame delay duration, the first STA feeds back a confirmation cancellation message to the first AP.
  • the STA may feed back the acknowledgement message to the first AP through the ACK frame at the Media Access Control (MAC) layer, or may feed back the acknowledgement message to the first AP through the Action frame at the protocol interaction layer.
  • MAC Media Access Control
  • Step 610 The first AP deletes the first STA and the first acknowledge timeout duration in the correspondence.
  • step 608 to the step 610 shown in FIG. 6 is only one possible implementation manner. In an actual application, the step 608 to the step 610 may be implemented at any position after the step 601.
  • the execution positions of steps 608 to 610 in steps 601 to 607 are not limited.
  • the MIMO controller may actively send the first response frame delay duration cancellation message to the first STA through the first AP as needed (such as after the network MIMO phase ends). Controls the STA cancellation and response frame delay duration.
  • the MIMO controller can actively send the first response frame delay duration cancellation message to the first STA by using the first AP, the following steps are included:
  • Step 611 When receiving the second response frame delay duration cancellation message of the first STA sent by the MIMO controller, the first AP sends a first response frame delay duration cancellation message to the first STA.
  • the first STA when receiving the first response frame delay duration cancellation message sent by the first AP, deletes the stored first response frame delay duration.
  • the first AP sends, to the first STA, a first indication frame carrying a cancellation response frame delay duration in the form of an aggregated frame, where the aggregated frame further includes a data frame.
  • the first AP in order to prevent the first acknowledgment timeout period corresponding to the first STA from increasing the network delay of the first STA, after the first AP sends the first acknowledgment frame delay duration cancellation message to the first STA, the first AP is in the corresponding relationship.
  • the first STA is deleted and the first acknowledgment timeout period is deleted.
  • step 611 is implemented before step 609.
  • the MIMO controller can separately set the number of times of use of the response frame delay duration, thereby controlling the number of times the STA uses the response frame delay time after receiving the data frame.
  • FIG. 7 is a flowchart of a method for setting a response frame delay duration provided by still another exemplary embodiment of the present application.
  • This embodiment is exemplified by the method used in the system architecture of the response frame delay duration setting system shown in FIG. 1, and the method includes the following steps:
  • Step 701 The MIMO controller allocates a first response frame delay duration to the first STA, and sets a usage time of the first response frame delay duration.
  • Step 702 The MIMO controller sends the number of uses to the first AP.
  • the first AP is an AP associated with the first STA.
  • Step 703 The MIMO controller acquires a delay time of the first response frame corresponding to the first STA.
  • Step 704 The MIMO controller sends a first response frame delay duration to the first AP.
  • the MIMO controller may separately send the first response frame delay duration and the first response frame delay duration to the first AP, and may also delay the first response frame delay duration and the first response frame delay duration. The usage count is combined into one message and sent to the first AP.
  • Step 705 The first AP sends, to the first STA, a first indication frame that carries the first response frame delay duration corresponding to the first STA and the usage count corresponding to the first response frame delay duration.
  • the first indication frame may be used to indicate a single delay or may be used to indicate multiple delays.
  • the delay time of the first response frame carried by the first indication frame can be used only once; when the multiple delay is indicated, the first indication frame carries the number of uses corresponding to the delay time of the first response frame.
  • the first indication frame also has the function of canceling the delay time of the response frame, and different functions are distinguished by the ACK delay time domain (type) of the Action Details field in the first indication frame.
  • Table 17 shows the possible meanings of the ACK delay time field in the description field of the first indication frame, and the meaning of the ACK delay time domain is the meaning of the first indication frame. It should be noted that the correspondence between the ACK delay time domain and the meaning in Table 17 does not limit the meaning of the ACK delay time domain.
  • Table 18 shows the first indication frame used to indicate the possible frame format for a single delay.
  • Table 19 shows the first indication frame for indicating the possible frame format for multiple delays.
  • the number of uses is set when the MIMO controller allocates a corresponding first response frame delay duration to the first STA.
  • Step 706 The first STA receives the first indication frame sent by the first AP, and acquires and stores the first response frame delay duration and the first response frame delay duration corresponding to the first STA carried in the first indication frame.
  • Step 707 When receiving the data frame sent by the first AP, the first STA decrements the number of times of use of the stored first response frame delay duration by one.
  • Step 708 If the number of times of using the delay time of the first response frame after subtracting 1 is less than 0, the first STA deletes the delay time of the first response frame and the delay time of the first response frame, and delays the default delay duration. And feeding back a response frame to the first AP.
  • the first STA deletes the delay time of the first response frame and the delay of the first response frame. And perform a default mechanism to delay the default delay duration and feed back the response frame to the first AP.
  • the first STA when the first STA receives the first response frame delay duration cancellation message sent by the first AP, even if the first response frame delay duration corresponds to the usage count greater than 0, the first STA still The stored first response frame delay is deleted and the default mechanism is executed.
  • Step 709 If the number of times of using the delay time of the first response frame after the decrement is less than 0, the first STA delays the delay time of the first response frame, and then feeds back the response frame to the first AP.
  • the delay time of the first response frame is less than 0, the number of times of use before the decrease is less than 0, and the first STA delays the delay of the first response frame, and then feeds back the response frame to the first AP.
  • steps 707 to 709 can be replaced by the following steps Q1 to Q3:
  • Step Q1 When receiving the data frame sent by the first AP, the first STA determines whether the used number of times of the stored first response frame delay duration is 0.
  • step Q2 if the number of times of use of the stored first response frame delay duration is 0, the first STA deletes the first acknowledgement timeout duration and the first response frame delay duration, and delays the default delay duration.
  • An AP feedback response frame if the number of times of use of the stored first response frame delay duration is 0, the first STA deletes the first acknowledgement timeout duration and the first response frame delay duration, and delays the default delay duration.
  • Step Q3 If the number of times of use of the stored first response frame delay duration is not 0, the first STA decrements the number of times of use of the stored first response frame delay duration by 1 and delays the delay of the first response frame. The first AP feeds back the response frame.
  • the first indication frame carrying the delay time of the first response frame is sent to the first STA by the network device, so that the first STA sends the first AP that is associated with the first STA.
  • the response frame of the same group is sent back to the first AP.
  • the AP erroneously determines that the response frame sent by the STA is not received due to the conflict between the response frame and the data frame, and the response frame and the response frame, thereby eliminating the polling overhead of the AP and avoiding waste of wireless communication resources. effect.
  • the MIMO controller can separately set the number of times of use of the response frame delay duration, thereby controlling the number of times the STA uses the response frame delay duration after receiving the data frame.
  • FIG. 8 is a flowchart of a method for setting a response frame delay duration provided by still another exemplary embodiment of the present application. This embodiment is exemplified by the method used in the system architecture of the response frame delay duration setting system shown in FIG. 1, and the method includes the following steps:
  • Step 801 The network device acquires a delay period of the first response frame corresponding to the first mobile station STA.
  • Step 802 The network device sends a delay time of the first response frame to the first STA, so that the first STA delays the delay of the first response frame and then feeds back the response frame when receiving the data frame.
  • Step 803 The network device acquires a delay time of the second response frame corresponding to the second STA.
  • Step 804 The network device sends a second response frame delay duration to the second STA, so that the second STA delays the second response frame delay duration and then feeds back the response frame when receiving the data frame.
  • first STA and the second STA are the same group of STAs, and the two STAs satisfy at least one of the following situations:
  • the first STA and the second STA are associated with the same AP, and the AP wants to send the data frame to the first STA and the second STA at the same time.
  • the first AP associated with the first STA and the second AP are in the same working frequency band, and the first AP sends the data frame to the first STA, and the second AP also sends the second AP to the second STA. Send a data frame.
  • the network device may set a different response frame delay duration for the first STA and the second STA (ie, the first response frame delay duration is different from the second response frame delay duration); or Setting a different response frame delay duration for the first STA and the second STA (ie, the first response frame delay duration is the same as the second response frame delay duration), but not simultaneously transmitting the data frame to the first STA and the second STA.
  • the first AP sends the first indication frame carrying the delay time of the first response frame to the first STA, so that the first STA delays the data frame sent by the first AP. After the delay time of the first response frame is delayed, the response frame is sent back to the first AP.
  • the delay time of the response frame of the same group of STAs is different, so that the same AP does not receive the response frame sent by the STAs at the same time.
  • the collision between the response frame and the data frame, and between the response frame and the response frame erroneously determines that the response frame sent by the STA is not received, thereby reducing the polling overhead of the first AP and avoiding waste of network resources. .
  • the response frames of the multiple STAs have different delay durations.
  • FIG. 9 is a schematic diagram of comparison between an existing data transmission process provided by an exemplary embodiment of the present application and a data transmission process according to the present application. As shown in FIG. 9, two APs, two STAs, and a data stream length of 500 us are used as an example.
  • AP1 and AP2 send data (500us) to STA1 and STA2 respectively in the MIMO phase of the network, and STA1 and STA2 feed back the response frame (24us).
  • an ACK conflict occurs between the response frames fed back by STA1 and STA2. Since both AP1 and AP2 do not receive the response frame sent by the corresponding STA, AP1 and AP2 start to compete for the air interface medium (34us+63us). Assume that AP1 obtains the media access right and then sends the BAR (24us). STA1 sends the BA (24us) to the SIFS after the BAR.
  • AP1 After receiving the BA sent by STA1, AP1 confirms that STA1 receives the data sent by AP1 in the network MIMO phase.
  • AP2 is sent to STA2's BAR (24us) after backoff (34us+63us), and STA2 sends BA (24us) to SIFS after BAR.
  • AP2 After receiving the BA sent by STA1, AP2 confirms that STA1 receives the data sent by AP1 in the network MIMO phase. .
  • AP1 and AP2 respectively send data to the STA1 and the STA2 and the corresponding first indication frame (504us) carrying the delay time of the response frame, wherein the delay time of the response frame corresponding to STA1 is 16us, STA2 The corresponding response frame delay is 40us.
  • the STA1 delays the 16us feedback frame (24us) to the AP.
  • the STA2 delays the feedback frame (24us) to the AP after delaying 40us.
  • Both AP1 and AP2 receive the response frame sent by the corresponding STA.
  • the data transmission process involved in the present application increases 4us in the data transmission phase, and saves 298 (362-64) in confirming whether STA1 and STA2 receive the data phase. Us, the entire process saves a total of 294us.
  • the solution provided by the embodiment of the present application is mainly introduced from the perspective of interaction between the network device and the STA.
  • the network device and the STA include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above functions.
  • the embodiments of the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements of the examples and algorithm steps described in the embodiments disclosed in the application. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the technical solutions of the embodiments of the present application.
  • FIG. 10 is a schematic diagram showing a possible structure of a network device according to an embodiment of the present application.
  • Network device 1000 includes a transmitter/receiver 1001 and a processor 1002.
  • the processor 1002 may also be a controller, and is represented as "controller/processor 1002" in FIG.
  • the transmitter/receiver 1001 is configured to support transmission and reception of information between the network device and the STA in the foregoing embodiment, and to support radio communication between the STA and other STAs.
  • the processor 1002 performs various functions for communicating with the STA.
  • On the uplink an uplink signal from the STA is received via an antenna, demodulated by the receiver 1001 (eg, demodulating the high frequency signal into a baseband signal), and further processed by the processor 1002 to recover the STA Send to business data and signaling information.
  • the traffic data and signaling messages are processed by the processor 1002 and modulated by the transmitter 1001 (e.g., modulating the baseband signal into a high frequency signal) to generate a downlink signal and transmitted to the STA via the antenna.
  • the processor 1003 is also configured to perform the process of step 1002 of FIG. 10 and/or other processes of the technical solutions described herein.
  • the network device 1000 may further include a memory 1003 for storing program codes and data of the network device 1000.
  • the network device can also include a transceiver 1004.
  • the transceiver 1004 is configured to support network devices to communicate with other network entities (eg, network devices in the core network, etc.).
  • the transceiver 1004 may be an S1-U interface for supporting a network device to communicate with a Serving Gateway (SGW); or the transceiver 1004 may be an S1-MME interface. It is used to support network devices to communicate with a Mobility Management Entity (MME).
  • MME Mobility Management Entity
  • FIG. 10 only shows a simplified design of the network device 1000.
  • the network device 1000 may include any number of transmitters, receivers, processors, controllers, memories, transceivers, etc., and all network devices that can implement the embodiments of the present application are protected in the embodiments of the present application. Within the scope.
  • FIG. 11 is a simplified schematic diagram showing a possible design structure of a first STA involved in the embodiment of the present application.
  • the first STA 1100 includes a transmitter 1101, a receiver 1102, and a processor 1103.
  • the processor 1103 may also be a controller, and is represented as "controller/processor 1103" in FIG.
  • the first STA 1100 may further include a modem processor 1104.
  • the modem processor 1104 may include an encoder 1105, a modulator 1106, a decoder 1107, and a demodulator 1108.
  • transmitter 1101 conditions (eg, analog transforms, filters, amplifies, upconverts, etc.) the output samples and generates an uplink signal that is transmitted via an antenna to the network described in the above embodiments. device.
  • the antenna receives the downlink signal transmitted by the network device in the above embodiment.
  • Receiver 1102 conditions (eg, filters, amplifies, downconverts, digitizes, etc.) the signals received from the antenna and provides input samples.
  • encoder 1108 receives the traffic data and signaling messages to be transmitted on the uplink and processes (e.g., formats, codes, and interleaves) the traffic data and signaling messages.
  • Modulator 1108 further processes (e.g., symbol maps and modulates) the encoded traffic data and signaling messages and provides output samples.
  • Demodulator 1010 processes (e.g., demodulates) the input samples and provides symbol estimates.
  • the decoder 1109 processes (e.g., deinterleaves and decodes) the symbol estimate and provides decoded data and signaling messages that are sent to the first STA 1100.
  • Encoder 1108, modulator 1108, demodulator 1010, and decoder 1109 may be implemented by a composite modem processor 1106. These units are processed according to the radio access technology employed by the radio access network (e.g., access technologies of LTE and other evolved systems). It should be noted that when the first STA 1100 does not include the modem processor 1106, the above functions of the modem processor 1106 may also be completed by the processor 1103.
  • the processor 1103 performs control management on the action of the first STA 1100, and is used to perform the processing performed by the first STA 1100 in the foregoing embodiment of the present application.
  • the processor 1103 is also configured to perform the process of step 804 of FIG. 6 and/or other processes of the technical solutions described herein.
  • the first STA 1100 may further include a memory 1109 for storing program codes and data for the first STA 1100.
  • the processor for performing the functions of the foregoing network device and the first STA in the embodiment of the present application may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and a dedicated integration. Circuit (Logic-Specific Integrated Circuit, ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or perform various exemplary logical blocks, modules and circuits described in connection with the disclosure of the embodiments of the present application.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the steps of the method or algorithm described in connection with the disclosure of the embodiments of the present application may be implemented in a hardware manner, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC.
  • the ASIC can be located in a network device or a first STA.
  • the processor and the storage medium may also exist as discrete components in the network device or the first STA.
  • FIG. 12A is a block diagram of an apparatus for setting a response frame delay duration according to an embodiment of the present application.
  • the response frame delay duration setting means can be implemented as all or part of the network device by software, hardware or a combination of both.
  • the response frame delay duration setting means may include: an acquisition module 1201 and a transmission module 1202.
  • the obtaining module 1201 is configured to implement the functions of step 501 described above.
  • the sending module 1202 is configured to implement the functions of the foregoing step 502.
  • the acquiring module is configured to implement the functions of at least one of step 603, step 703, step 801, and step 803.
  • the sending module 1202 is configured to implement the functions of at least one of step 605, step 607, step 608, step 611, step 702, step 704, step 705, step 802, and step 804.
  • the response frame delay duration setting means may include: a receiving module 1203, a setting module 1204, a deleting module 1205, and a second setting module 1206.
  • the receiving module 1203 is configured to implement the function of the foregoing step 601.
  • the setting module 1204 is configured to implement the functions of at least one of the foregoing steps 602 and 701.
  • the deleting module 1205 is configured to implement the function of the above step 610.
  • the foregoing obtaining module 1201 may be implemented by the processor 31 in FIG. 3 executing the obtaining module program 361 in the memory 34; the transmitting module 1202 may execute the sending module program in the memory 34 by the processor 31 in FIG. 362 is implemented; the receiving module 1203 can be implemented by the processor 31 in FIG. 3 to execute the receiving module program 364 in the memory 34; the setting module 1204 can be implemented by the processor 31 in FIG. 3 to execute the setting module program 363 in the memory 34.
  • the above-described deletion module 1205 can be implemented by the processor 31 in FIG. 3 executing the delete module program 365 in the memory 34.
  • FIG. 13A is a block diagram of an apparatus for setting a response frame delay duration according to another embodiment of the present application.
  • the response frame delay duration setting means may be implemented as all or part of the first STA by software, hardware or a combination of both.
  • the response frame delay duration setting means may include: a receiving module 1301 and a feedback module 1302.
  • the receiving module 1301 is configured to implement the functions of step 503 above.
  • the feedback module 1302 is configured to implement the functions of the foregoing step 504.
  • the receiving module 1301 is configured to implement the functions of at least one of the steps 604 and 706.
  • the feedback module 1302 is configured to implement the functions of at least one of step 606, step 708, and step 709.
  • the response frame delay duration setting means may include: a deletion module 1303 and a calculation module 1304.
  • the deleting module 1303 is configured to implement the functions of step 609 described above.
  • the calculation module 1304 is configured to implement the function of step 707 above.
  • the foregoing receiving module 1301 can be implemented by the processor 41 in FIG. 4 executing the receiving module program 461 in the memory 44; the feedback module 1302 can execute the feedback module program in the memory 44 by the processor 41 in FIG. 462 is implemented; the deletion module 1303 can be implemented by the processor 41 in FIG. 4 executing the delete module program 463 in the memory 44, and the calculation module 1304 can be implemented by the processor 41 in FIG. 4 executing the calculation module program 464 in the memory 44.
  • the response frame delay duration setting apparatus when the response frame delay duration setting apparatus provided in the foregoing embodiment sets the response frame delay duration, only the division of each functional module is illustrated. In actual applications, the foregoing function assignment may be different according to requirements.
  • the function module is completed, that is, the internal structure of the network device is divided into different functional modules and the internal structure of the STA is divided into different functional modules to complete all or part of the functions described above.
  • the acknowledgment frame delay duration setting apparatus and the response frame delay duration setting method embodiment provided by the foregoing embodiments are in the same concept, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.
  • 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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Abstract

本申请公开了一种应答帧延迟时长设置方法、装置及系统，涉及无线通信技术领域。该方法包括：获取第一移动站STA对应的第一应答帧延迟时长；向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，以使所述第一STA在接收到数据帧时，推迟所述第一应答帧延迟时长后反馈应答帧。本申请避免了AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了消除AP的轮询开销，避免无线通信资源的浪费的效果。

Description

应答帧延迟时长设置方法、装置及系统
本申请要求于2017年11月02日提交的申请号为201711064953.4、申请名称为“应答帧延迟时长设置方法、装置及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，特别涉及一种应答帧延迟时长设置方法、装置及系统。
背景技术
为了解决无线通信系统所要求的增加的带宽需求的问题，电气与电子工程师协会(IEEE)802.11标准之类的几种新出现的无线通信标准中采用了多输入多输出(Multiple-Input Multiple-Output，MIMO)技术，使得多个移动站(Station，STA)通过共享信道资源与一个或者多个接入点(Access Point，AP)进行通信，从而达到高数据吞吐量的目的。
为了提高MIMO通信的可靠性，当STA接收到AP发送的数据帧(Packet)时，该STA需要通过向AP反馈应答帧(ACK)来告知该AP已接收到数据帧。
在实际的应用中，同一个AP与不同的STA之间可能会发生数据的并发传输，数据之间的并发传输易产生干扰。图1A示出了本申请一个示例性实施例提供的应答帧与应答帧之间冲突的示意图，如图1A所示，当AP同时接收到多个STA反馈的应答帧时，该AP所接收到的应答帧之间会产生冲突(干扰)。图1B示出了本申请一个示例性实施例提供的应答帧与数据帧之间冲突的示意图，如图1B所示，当AP在向STA1发送数据帧的过程中，接收到STA2反馈的应答帧时，该应答帧与数据帧之间会产生冲突(干扰)。
数据之间产生的干扰易导致AP错误地判定未接收到STA发送的应答帧，即判定发送给STA的数据帧丢失，以至于AP后续会向STA轮询是否接收到数据帧，致使无线通信资源的浪费。
发明内容
本申请公开了一种应答帧延迟时长设置方法及装置，可以解决相关技术中的问题。所述技术方案如下：
第一方面，提供了一种应答帧延迟时长设置方法，应用于网络设备，所述方法包括：
获取第一移动站STA对应的第一应答帧延迟时长；
向所述第一STA发送所述第一应答帧延迟时长，以使所述第一STA在接收到数据帧时，推迟所述第一应答帧延迟时长后反馈应答帧。
本申请实施例提供的应答帧延迟时长设置方法，通过网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到该第一STA关联的第一AP发 送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧，由于同组STA的应答帧延迟时长通常不同，使得同一AP不会同时接收到同组STA发送的应答帧，避免AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了消除AP的轮询开销，避免无线通信资源的浪费的效果。
结合第一方面或者第一方面的第一种可能的实施方式，在第一方面的第二种可能的实施方式中，所述方法还包括：获取第二STA对应的第二应答帧延迟时长，所述第二STA与所述第一STA为同组STA；向所述第二STA发送携带有所述第二应答帧延迟时长的第二指示帧，以使所述第二STA在接收到数据帧时，推迟所述第二应答帧延迟时长后反馈应答帧。
结合第一方面或者第一方面的第二种可能的实施方式，在第一方面的第三种可能的实施方式中，MIMO控制器根据第一STA对网络时延的容忍程度，在该第一STA对网络时延的容忍程度内为该第一STA随机分配对应的第一应答帧延迟时长，所述网络设备为MIMO控制器，在所述获取第一移动站STA对应的第一应答帧延迟时长之前，所述方法还包括：为所述第一STA分配第一应答帧延迟时长；所述向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，包括：向第一接入点AP发送所述第一应答帧延迟时长，由所述第一AP将所述第一应答帧延迟时长转发至所述第一STA，所述第一AP为所述第一STA关联的AP。
结合第一方面、第一方面的第一种可能的实现或者第一方面的第三种可能的实现，在第一方面的第四种可能的实现中，由于MIMO控制器可在单独设置该应答帧延迟时长的使用次数，从而控制STA接收到数据帧后使用应答帧延迟时长的次数，因此在所述为所述第一STA分配第一应答帧延迟时长之后，所述方法还包括：设置所述第一应答帧延迟时长的使用次数；向所述第一AP发送所述使用次数，由所述第一AP将所述使用次数转发至所述第一STA。
结合第一方面、第一方面的第一种至第四种可能的实现，在第一方面的第五种可能的实现中，现有技术中，由于STA接收到数据帧之后通常需要间隔一个最小帧间隔(Short Inter Frame Space，SIFS)后向AP反馈应答帧，因此AP的确认超时时间是针对该最小帧间隔设置的，所以当MIMO控制器为每个STA分配应答帧延迟时长后，还需根据每个STA的应答帧延迟时长分别设置每个STA对应的确认超时时间，从而避免AP过早判断数据丢失启动重发流程，即所述网络设备为第一AP，在所述获取第一移动站STA对应的第一应答帧延迟时长之前，所述方法还包括：接收MIMO控制器发送的所述第一STA对应的第一确认超时时长，将所述第一STA与所述第一确认超时时长，添加到预先存储的STA和确认超时时长的对应关系中；根据所述第一确认超时时长设置所述第一STA对应的第一应答帧延迟时长，所述第一确认超时时长大于所述第一应答帧延迟时长。
结合第一方面、第一方面的第一种至第五种可能的实现，在第一方面的第六种可能的实现中，由于聚合帧节省了帧前导和头部等开销，能有效降低网络开销，因此所述向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，包括：以聚合帧的形式向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，所述聚合帧还包括数据帧。
结合第一方面、第一方面的第一种至第六种可能的实现，在第一方面的第七种可能的实现中，所述方法还包括：在向所述第一STA发送数据帧之后，如果在所述第一确认超时时长内未接收到所述第一STA反馈的数据帧，则向所述第一STA重新发送所述数据帧。
结合第一方面、第一方面的第一种至第七种可能的实现，在第一方面的第八种可能的实现中，由于STA的确认超时时间是MIMO控制器基于该STA的应答帧延迟时长设置的，因此为了避免MIMO控制器取消STA的确认超时时间后，AP过早判断数据丢失启动重发流程，在取消STA的确认超时时间后，还需要取消STA的应答帧延迟时长，使得STA和AP均恢复到默认机制，所述方法还包括：当接收到所述MIMO控制器发送的所述第一STA的第一确认超时时长取消消息时，向所述第一STA发送第一应答帧延迟时长取消消息，以使所述第一STA删除存储的所述第一应答帧延迟时长；在所述对应关系中删除所述第一STA和所述第一确认超时时长。
第二方面，提供了一种应答帧延迟时长设置方法，应用于第一STA，所述方法包括：
接收第一AP发送的第一指示帧，获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长，所述第一AP为所述第一STA关联的AP；
每当接收到所述第一AP发送的数据帧时，推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
本申请实施例提供的应答帧延迟时长设置方法，通过网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到该第一STA关联的第一AP发送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧，由于同组STA的应答帧延迟时长通常不同，使得同一AP不会同时接收到同组STA发送的应答帧，避免AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了消除AP的轮询开销，避免无线通信资源的浪费的效果。
结合第二方面，在第二方面的第一种可能的实施方式中，由于聚合帧节省了帧前导和头部等开销，能有效降低网络开销，因此所述接收第一AP发送的第一指示帧，包括：接收所述第一AP发送的聚合帧，得到所述聚合帧中包括的第一指示帧和数据帧，并推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
结合第二方面或者第二方面的第一种可能的实施方式，在第二方面的第二种可能的实施方式中，由于MIMO控制器可在单独设置该应答帧延迟时长的使用次数，从而控制STA接收到数据帧后使用应答帧延迟时长的次数，因此所述第一指示帧中还携带有所述第一应答帧延迟时长对应的使用次数，所述第一指示帧中还携带有所述第一应答帧延迟时长对应的使用次数，所述第一指示帧中还携带有所述第一应答帧延迟时长对应的使用次数，所述获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长，包括：获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长和所述第一应答帧延迟时长对应的使用次数；所述推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧，包括：将存储的所述第一应答帧延迟时长对应的使用次数减1；如果减1后的第一应答帧延迟时长对应的使用次数小于0，则删除所述第一应答帧延迟时长和所述第一应答帧延迟时长对应的使用次数，并推迟默认延迟时长后，向所述第一AP反馈应答帧；如果减1后的第一应答帧延迟时长对应的使用次数不小于0，则推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
第三方面，提供了一种应答帧延迟时长设置装置，应用于网络设备，所述装置包括：
获取模块，用于获取第一移动站STA对应的第一应答帧延迟时长；
发送模块，用于向所述第一STA发送所述第一应答帧延迟时长，以使所述第一STA在 接收到数据帧时，推迟所述第一应答帧延迟时长后反馈应答帧。
第四方面，提供了一种应答帧延迟时长设置装置，应用于第一STA，所述装置包括：
接收模块，用于接收第一AP发送的第一指示帧，获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长，所述第一AP为所述第一STA关联的AP；
反馈模块，用于每当接收到所述第一AP发送的数据帧时，推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
第五方面，提供了一种网络设备，所述网络设备包括处理器和存储器，所述存储器中存储有至少一条指令，所述至少一条指令由所述处理器加载并执行以实现上述第一方面的应答帧延迟时长设置方法所涉及的相应步骤。
第六方面，提供了一种第一STA，所述第一STA包括处理器和存储器，所述存储器中存储有至少一条指令，所述至少一条指令由所述处理器加载并执行以实现上述第二方面的应答帧延迟时长设置方法所涉及的相应步骤。
第七方面，提供了一种应答帧延迟时长设置系统，所述系统包括网络设备和STA；
所述网络设备包括如第三方面所述的应答帧延迟时长设置装置；或，所述网络设备包括如第五方面所述的网络设备；
所述STA包括如第四方面所述的应答帧延迟时长设置装置；或，所述STA包括如第六方面所述的第一STA。
第八面，提供一种计算机可读存储介质，所述计算机可读存储介质中存储有至少一条指令，至少一条指令由处理器加载并执行以实现上述第一方面中任意一种可能的实现方式所提供的应答帧延迟时长设置方法。
第九方面，提供一种计算机可读存储介质，所述计算机可读存储介质中存储有至少一条指令，至少一条指令由处理器加载并执行以实现上述第二方面中任意一种可能的实现方式的应答帧延迟时长设置方法。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1A是本申请一个示例性实施例提供的应答帧与应答帧之间冲突的示意图；
图1B是本申请一个示例性实施例提供的应答帧与数据帧之间冲突的示意图；
图2A是本申请一个实施例应用的应答帧延迟时长设置系统的系统架构示意图；
图2B是本申请一个实施例应用的AP与MIMO控制器连接方式的示意图；
图3是本申请一个示例性实施例应用的网络设备的结构示意图；
图4是本申请一个示例性实施例应用的STA的结构示意图；
图5A是本申请一个示例性实施例提供的应答帧延迟时长设置方法的流程图；
图5B是本申请一个示例性实施例提供的第一AP所接收到的应答帧和应答帧之间的示意图；
图6是本申请另一个示例性实施例提供的应答帧延迟时长设置方法的流程图
图7是本申请再一个示例性实施例提供的应答帧延迟时长设置方法的流程图；
图8是本申请又一个示例性实施例提供的应答帧延迟时长设置方法的流程图；
图9是本申请一个示例性实施例提供的现有数据传输流程与本申请所涉及的数据传输流程的对比示意图；
图10是本申请实施例所涉及的网络设备的一种可能的结构示意图；
图11是本申请实施例中所涉及的STA的一种可能的设计结构的简化示意图；
图12A是本申请一个实施例提供的应答帧延迟时长设置装置的框图；
图12B是本申请一个实施例提供的应答帧延迟时长设置装置的框图；
图13A是本申请另一个实施例提供的应答帧延迟时长设置装置的框图；
图13B是本申请另一个实施例提供的应答帧延迟时长设置装置的框图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
在本文提及的“模块”是指存储在存储器中的能够实现某些功能的程序或指令；在本文中提及的“单元”是指按照逻辑划分的功能性结构，该“单元”可以由纯硬件实现，或者，软硬件的结合实现。
请参考图2A，其示出了本申请一个实施例应用的应答帧延迟时长设置系统的系统架构示意图，本申请所涉及的应答帧延迟时长设置方法应用于该应答帧延迟时长设置系统中，该应答帧延迟时长设置系统包括：多个网络设备和多个STA，其中，网络设备至少包括一个MIMO控制器和至少一个AP。
AP与STA通过无线连接，AP与MIMO控制器通过交换机连接，其中，交换机分别与AP和MIMO控制器进行有线/无线连接，有线连接的方式包括光纤和以太连接。
需要说明的是，本应答帧延迟时长设置系统的系统架构中并不限定AP与MIMO控制器之间交换机的个数，图2B示出了本申请一个实施例应用的AP与MIMO控制器连接方式的示意图。AP与MIMO控制器之间通过一台交换机连接(如图2B(1)所示，AP1与AP2均通过一台交换机与MIMO控制器连接)，也可以通过多台交换机连接(如图2B(2)所示，AP2通过两台交换机与MIMO控制器连接；如图2B(3)所示，AP2通过三台交换机与MIMO控制器连接)。当AP与MIMO控制器之间通过通过多台交换机连接相连时，每两台交换机之间可直连(如图2B(2)所示，交换机1与交换机2直连；如图2B(3)所示，交换机3分别与交换机1和交换机2直连)，也可通过路由器连接(如图2B(4)所示，交换机1与交换机2通过路由器1连接)。其中，交换机之间、交换机与路由器之间的连接为有线/无线连接。
MIMO控制器可以为一个独立的设备也可以集成在控制器(Access Point Controller，AC)中。当MIMO控制器为一个独立的设备时，该MIMO控制器通常运行在一个通用的计算机上，比如在计算机的中央处理器(Central Processing Unit，CPU)上运行、进行硬件(比如CPU硬核、图形处理器(Graphics Processing Unit，GPU)、现场可编程门阵列(Field－Programmable Gate Array，FPGA))加速；当MIMO控制器集成在AC上时，该MIMO控 制器通常作为AC的一个功能模块，其中，MIMO控制器与AP之间的通信利用AP与AC之间通信隧道进行。
请参考图3，其示出了本申请一个示例性实施例应用的网络设备的结构示意图。该网络设备包括：处理器31、网络接口32、高速缓存器33、存储器34和总线35。
处理器31包括一个或者一个以上处理核心，处理器31通过运行软件程序以及模块，从而执行各种功能应用以及数据处理。
网络接口32用于供网络设备与其他网络设备进行通信。
存储器34与高速缓存器33分别通过总线35与处理器31相连。
存储器34可用于存储软件程序以及模块。
存储器34可以存储至少一个功能所需的应用程序模块36，应用程序模块36至少包获取模块程序361、发送模块程序362、设置模块程序363、接收模块程序364和删除模块程序365。
获取模块程序361，用于获取第一移动站STA对应的第一应答帧延迟时长；获取第二STA对应的第二应答帧延迟时长，第二STA与第一STA为同组STA。
发送模块程序362，用于向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到数据帧时，推迟第一应答帧延迟时长后反馈应答帧；向第二STA发送携带有第二应答帧延迟时长的第二指示帧，以使第二STA在接收到数据帧时，推迟第二应答帧延迟时长后反馈应答帧；向第一接入点AP发送第一应答帧延迟时长，由第一AP将第一应答帧延迟时长转发至第一STA，第一AP为第一STA关联的AP；向第一AP发送使用次数，由第一AP将使用次数转发至第一STA；以聚合帧的形式向第一STA发送携带有第一应答帧延迟时长的第一指示帧，聚合帧还包括数据帧；在向第一STA发送数据帧之后，如果在第一确认超时时长内未接收到第一STA反馈的数据帧，则向第一STA重新发送数据帧；当接收到MIMO控制器发送的第一STA的第一确认超时时长取消消息时，向第一STA发送第一应答帧延迟时长取消消息，以使第一STA删除存储的第一应答帧延迟时长。
设置模块程序363，用于在获取第一移动站STA对应的第一应答帧延迟时长之前，为第一STA分配第一应答帧延迟时长；在为第一STA分配第一应答帧延迟时长之后，设置第一应答帧延迟时长的使用次数；根据第一确认超时时长设置第一STA对应的第一应答帧延迟时长，第一确认超时时长大于第一应答帧延迟时长。
接收模块程序364，用于在获取第一移动站STA对应的第一应答帧延迟时长之前，接收MIMO控制器发送的第一STA对应的第一确认超时时长，将第一STA与第一确认超时时长，添加到预先存储的STA和确认超时时长的对应关系中。
删除模块程序365，用于在对应关系中删除第一STA和第一确认超时时长。
存储器34可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
本领域技术人员可以理解，图3中所示出的网络设备的结构并不构成对网络设备的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
请参考图4，其示出了本申请一个示例性实施例应用的第一STA的结构示意图。该第一STA包括：处理器41、网络接口42、高速缓存器43、存储器44和总线45。
处理器41包括一个或者一个以上处理核心，处理器41通过运行软件程序以及模块，从而执行各种功能应用以及数据处理。
网络接口42用于供网络设备与其他网络设备进行通信。
存储器44与高速缓存器43分别通过总线45与处理器41相连。
存储器44可用于存储软件程序以及模块。
存储器44可以存储至少一个功能所需的应用程序模块46，应用程序模块46至少包括接收模块程序461、反馈模块程序462、删除模块程序463和计算模块程序464。
接收模块程序461，用于接收第一AP发送的第一指示帧，获取并存储第一指示帧中携带的第一STA对应的第一应答帧延迟时长，第一AP为第一STA关联的AP；获取并存储第一指示帧中携带的第一STA对应的第一应答帧延迟时长和第一应答帧延迟时长对应的使用次数。
反馈模块程序462，用于每当接收到第一AP发送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧；将存储的第一应答帧延迟时长对应的使用次数减1；如果减1后的第一应答帧延迟时长对应的使用次数小于0，则删除第一应答帧延迟时长和第一应答帧延迟时长对应的使用次数，并推迟默认延迟时长后，向第一AP反馈应答帧；如果减1后的第一应答帧延迟时长对应的使用次数不小于0，则推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
删除模块程序463，用于当接收到第一AP发送的第一应答帧延迟时长取消消息时，第一STA删除存储的第一应答帧延迟时长。
计算模块程序464，用于每当接收到第一AP发送的数据帧时，第一STA将存储的第一应答帧延迟时长对应的使用次数减1。
存储器44可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
本领域技术人员可以理解，图4中所示出的第一STA的结构并不构成对第一STA的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
实施例一
请参考图5A，其示出了本申请一个示例性实施例提供的应答帧延迟时长设置方法的流程图。本实施例以该方法用于如图2A所示的应答帧延迟时长设置系统的系统架构中来举例说明，如图5A所示，该方法包括以下几个步骤：
步骤501，网络设备获取第一STA对应的第一应答帧延迟时长。
其中，网络设备为MIMO控制器或者第一AP，该第一AP为第一STA关联的AP。
当网络设备为MIMO控制器时，该网络设备在获取第一STA对应的第一应答帧延迟时长之前，为第一STA分配第一应答帧延迟时长。
可选的，MIMO控制器根据第一STA的网络延时情况，为第一STA分配对应的第一应答帧延迟时长。
当网络设备为第一AP时，该网络设备接收MIMO控制器发送的第一STA对应的第一应答帧延迟时长。
第一STA会向第一AP发送关联请求，当第一AP接收到第一STA发送的关联请求后，则判定该第一STA欲关联该第一AP，此时第一AP获取第一STA对应的第一应答帧延迟时长。
步骤502，网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧。
当网络设备为MIMO控制器，该网络设备向第一AP发送第一应答帧延迟时长，由第一AP将第一应答帧延迟时长转发至第一STA。
当网络设备为第一AP时，该网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧。
携带有第一应答帧延迟时长的第一指示帧使用的是管理帧子类型为1101(Action)和1110(Action No ACK)，二者的区别在于，当第一STA接收到Action帧时需向第一AP回复应答帧，当第一STA接收到Action No ACK帧时无需向第一AP回复应答帧。Action帧利于提供可靠性传输，Action No ACK帧利于降低网络开销。
下面以第一指示帧为Action类型进行说明，Action No ACK类型与Action类型原理类似，本实施例不再赘述。
Action帧包含两个主要字段，一个是类别(Category)字段，类别字段用于表明Action帧的具体子类型，第二个是说明(Action Details)字段，说明字段用于对Action帧进行描述。
其中，表1所示为Action帧的类别字段中code可能的数值。
表1
Figure PCTCN2018112709-appb-000001
需要说明的是，Action帧的类别可使用code中任一未被现有协议定义或者约定含义的数值。比如，Action帧的类别中code为16。
在一种可能实现的方式中，第一AP在获取第一STA对应的第一应答帧延迟时长之后，可在向第一STA发送数据帧时，将第一指示帧与数据帧形成聚合帧后发送至第一STA，由于聚合帧节省了帧前导和头部等开销，因此能有效降低网络开销。
当网络设备为第一AP时，步骤502可被替代为：第一AP以聚合帧的形式向第一STA发送携带有第一应答帧延迟时长的第一指示帧，该聚合帧还包括数据帧。
具体的，通过聚合MAC协议数据单元(Aggregate MAC Protocol Data Unit，A-MPDU)聚合发送第一指示帧和数据帧。
举例，假设第一AP在确定第一STA对应的第一应答帧延迟时长之后，有2个数据帧需要向第一STA发送，则将2个数据帧聚合后得到下行数据如表2所示。
表2
Figure PCTCN2018112709-appb-000002
表3示出的是第一指示帧与数据帧聚合后得到聚合帧中，第一指示帧可能位于数据帧中的位置。需要说明的是，本实施例并不限定第一指示帧在数据帧中的位置。
表3
Figure PCTCN2018112709-appb-000003
一方面，当第一AP向第一STA发送第一个数据帧时，将该数据帧与第一指示帧聚合发送至MIMO控制器，由于聚合帧可以节省了帧前导和头部等开销，因此可有效降低网络开销。
另一方面，如果在网络MIMO模式结束时，第一AP与第一STA没有信息交互，则可省去发送第一指示帧的步骤，从而降低网络开销。
步骤503，第一STA接收第一AP发送的第一指示帧，获取并存储第一指示帧中携带的第一STA对应的第一应答帧延迟时长。
需要说明的是，当第一AP以聚合帧的形式向第一STA发送携带有第一应答帧延迟时长的第一指示帧时，第一STA接收第一AP发送的聚合帧，得到聚合帧中包括的第一指示帧和数据帧，并推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
步骤504，每当接收到第一AP发送的数据帧时，第一STA推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
通常每个STA对应的应答帧延迟时长通常不同，当每个STA接收到第一AP发送的数据帧后，各自推迟对应的应答帧延迟时长后，向该第一AP反馈应答帧。由于各个STA从接收到数据帧到确认向第一AP发送应答帧之间的时间间隙很小甚至为0，第一AP也无需向各个STA发送查询请求，因此可有效节省大量块确认请求(Block Acknowledgment Request，BAR)的占用时间、BAR和块确认消息(Block Acknowledgment，BA)间的SIFS、应答帧之间的退避时间以及数据冲突导致消息重传后，第一AP接收到STA再次回复应答帧的时间。
图5B示出了本申请一个示例性实施例提供的第一AP所接收到的应答帧和应答帧之间的示意图，其中第一AP设置STA1对应的应答帧延迟时长为16us，STA2对应的应答帧延迟时长为40us，如图5B所示，第一AP同时向STA1和STA2发送数据帧，数据流长度为500us，STA1在接收到数据帧后推迟16us向第一AP反馈应答帧，STA2在接收到数据帧后推迟40us向第一AP反馈应答帧。
本申请实施例提供的应答帧延迟时长设置方法，通过网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到该第一STA关联的第一AP发送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧，由于同组STA的应答帧延迟时长通常不同，使得同一AP不会同时接收到同组STA发送的应答帧，避免AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了消除AP的轮询开销，避免无线通信资源的浪费的效果。
实施例二
现有技术中，STA接收到数据帧之后通常需要间隔一个SIFS后向第一AP反馈应答帧，由于第一AP的确认超时时间是针对该最小帧间隔设置的，因此当为每个STA分配应答帧延迟时长后，还需根据每个STA的应答帧延迟时长分别设置第一AP对于每个STA的确认超时时长，从而避免第一AP过早判断数据丢失启动重发流程。
请参考图6，其示出了本申请另一个示例性实施例提供的应答帧延迟时长设置方法的流程图。本实施例以该方法用于如图1所示的应答帧延迟时长设置系统的系统架构中来举例说明，该方法包括以下几个步骤：
步骤601，第一AP接收MIMO控制器发送的第一STA对应的第一确认超时时长，将第一STA与第一确认超时时长，添加到预先存储的STA和确认超时时长的对应关系中。
比如，第一AP接收到MIMO控制器发送的第一STA对应的第一应答帧延迟时长80us，根据第一应答帧延迟时长设置该第一STA对应的第一确认超时时长为100us。
需要说明的是，MIMO控制器可针对不同的STA设置不同的确认超时时长，也可以对不同的STA设置相同的确认超时时长。当对不同的STA设置相同的确认超时时长时，该确认超时时长大于应答帧延迟时长最长的STA对应的应答帧延迟时长。
其中，表4所示为MIMO控制器可对同一AP所连接的不同STA设置不同的确认超时时长。
表4
AP STA 确认超时时长(us)
AP1 STA1 36
AP1 STA2 50
其中，表5所示为MIMO控制器可对同一AP所连接的不同STA设置相同的确认超时时长。
表5
AP STA 确认超时时长(us)
AP1 STA1 50
AP1 STA2 50
可选的，MIMO控制器以TLV格式向第一AP发送第一STA对应的第一确认超时时长。
可选的，为了提高MIMO通信的可靠性，第一AP接收MIMO控制器发送的第一STA对应的第一确认超时时长之后，向MIMO控制器反馈确认设置消息。
需要说明的是，为了保证MIMO通信的可靠性，第一AP可向MIMO控制器回复携带有第一STA相关信息的复杂确认消息。为了减少网络开销，第一AP也可向MIMO控制器回复不携带有原有设置的简短确认消息。
举例，MIMO控制器向第一AP发送的第一STA对应的第一确认超时时长和第一应答帧延迟时长，该第一STA的MAC地址为0x0A1122334455，该第一应答帧延迟时长为50us，该第一确认超时时长为100us。
其中，MIMO控制器向第一AP发送携带有第一确认超时时长，且不需要第一AP反馈确认设置消息的设置消息，表6所示为设置消息可能的消息格式。(时间单位为：us)
表6
Figure PCTCN2018112709-appb-000004
其中，MIMO控制器向第一AP发送携带有第一确认超时时长，且需要第一AP反馈复杂确认消息的设置消息，表7所示为设置消息可能的消息格式。(时间单位为：us)
表7
Figure PCTCN2018112709-appb-000005
其中，MIMO控制器向第一AP发送携带有第一确认超时时长，且需要第一AP反馈简短确认消息的设置消息，表8所示为设置消息可能的消息格式。(时间单位为：us)
表8
Figure PCTCN2018112709-appb-000006
需要说明的是，表6至表8中Type、Len和Value中各个数值的含义仅为一种可能的表示方式，本实施例并不对Type、Len和Value中各个数值的含义做任何限定。
对应的，当第一AP接收到MIMO控制器发送的需要第一AP反馈复杂确认消息的设置消息时，第一AP所反馈的复杂确认消息可能的的消息格式如表9所示。(时间单位为：us)
表9
Figure PCTCN2018112709-appb-000007
对应的，当第一AP接收到MIMO控制器发送的需要第一AP反馈简短确认消息的设置消息时，第一AP所反馈的简短确认消息可能的的消息格式如表10所示。(时间单位为：us)
表10
Type Len Value
00(消息类型) 1 2(表示简要确认回复)
01(消息标识) 2 消息ID
05 1 0
… … …
可选的，第一AP以TLV格式向MIMO控制器反馈确认设置消息。
在一种可能实现的方式中，每个STA的确认超时时长除了由MIMO控制器设置，还可以由每个STA关联的第一AP设置：第一AP接收MIMO控制器发送的第一STA对应的第一应答帧延迟时长，根据第一应答帧延迟时长设置该第一STA对应的第一确认超时时长， 将第一STA与第一确认超时时长，添加到预先存储的STA和确认超时时长的对应关系中。
需要说明的是，该第一确认超时时长大于第一应答帧延迟时长。
步骤602，第一AP根据第一确认超时时长设置第一STA对应的第一应答帧延迟时长。
比如，第一AP接收到MIMO控制器发送的第一STA对应的第一确认超时时长100us，根据第一确认超时时长设置该第一STA对应的第一应答帧延迟时长为80us。
在一种可能实现的方式中，第一STA对应的第一应答帧延迟时长除了由第一AP设置还可以由MIMO控制器设置：第一AP接收MIMO控制器发送的第一STA对应的第一应答帧延迟时长，向第一STA发送第一应答帧延迟时长。
步骤603，第一AP向第一STA发送携带有第一应答帧延迟时长的第一指示帧。
步骤604，第一STA接收第一AP发送的第一指示帧，获取并存储第一指示帧中携带的第一STA对应的第一应答帧延迟时长。
步骤605，第一AP向第一STA发送数据帧。
可选的，第一AP和第一STA分别设置有两个接口，分别为第一接口和第二接口，其中第一接口的功耗大于第二接口的功耗。
第一AP通过第一接口向STA发送第一指示帧和数据帧，通过第二接口用于监听和接收各个STA反馈的应答帧，从而达到降低第一AP功耗的目的。
同理，第一STA通过第一接口用于向第一AP反馈应答帧，通过第二接口用于监听和接收各个第一AP发送的指示帧和数据帧，第一接口的功耗大于第二接口的功耗，从而达到降低第一STA功耗的目的。
在一种可能的实现场景中，当第一AP进入休眠状态时，第一AP利用第二接口进行监听，当第一AP监听到第一STA发送的PS-Poll帧时，通过第二接口向第一STA反馈应答帧。
需要说明的是，当第一AP监听到第一STA发送的PS-Poll帧时，可以立即向第一STA反馈应答帧，也可以等到环境允许向第一STA反馈应答帧，还可以在空闲状态时向第一STA反馈应答帧。本实施例并不对第一AP向第一STA反馈应答帧的时机做任何限定。
在另一种可能的实现场景中，当第一STA进入休眠状态时，第一STA利用第二接口进行监听，当第一STA监听到第一AP发送的唤醒帧时，推迟第一应答帧延迟时长后，通过第二接口向第一AP反馈应答帧。
如果与同一AP关联的多个STA的工作频段相同，且该多个STA的应答帧延迟时长相同，第一AP可通过不同时向该多个STA发送数据帧或者指示帧的方式，来避免该多个STA同时向该第一AP反馈应答帧的情况。
可选的，在步骤802之后，第一AP将第一STA与第一应答帧延迟时长，添加到预先存储的STA和应答帧延迟时长的对应关系中。同时，在步骤803之前，第一AP需要执行下述步骤：
S1，判定是否需要同时向其他STA发送数据；
S2，如果需要同时向其他STA发送数据，则将根据预先存储的STA和应答帧延迟时长的对应关系，判定需要同时发送数据帧的STA中是否存在对应的应答帧延迟时长相同的STA；
S3，如果需要同时发送数据帧的STA对应的应答帧延迟时长均不相同，则执行向第一 STA发送数据帧的步骤；
S4，如果需要同时发送数据帧的STA中存在对应的应答帧延迟时长相同的STA，则先后依次向应答帧延迟时长相同的STA发送数据帧；或者，如果需要同时发送数据帧的STA中存在对应的应答帧延迟时长相同的STA，则先将该应答帧延迟时长相同的STA的应答帧延迟时长设置成不同的应答帧延迟时长，再向重新设置应答帧延迟时长的STA发送数据帧。
当第一STA再次接收到携带有应答帧延迟时长的第一指示帧后，会将该第一指示帧中的应答帧延迟时长替代本地所存储的应答帧延迟时长。
比如，第一STA存储有应答帧延迟时长90us，当第一STA接收到第一AP发送的携带有应答帧延迟时长120us的第一指示帧时，获取第一指示帧中携带的应答帧延迟时长120us，并将120us替代90us进行存储。
需要说明的是，步骤S4中可以由MIMO控制器重新设置STA的应答帧延迟时长，也可以由AP重新设置STA的应答帧延迟时长。
需要说明的是，本实施例不限定先后发送数据帧的时间间隔的具体值。
步骤606，每当接收到第一AP发送的数据帧时，第一STA推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
步骤607，在向第一STA发送数据帧之后，如果第一AP在第一确认超时时长内未接收到第一STA反馈的数据帧，则向第一STA重新发送数据帧。
如果在第一STA对应的第一确认超时时长内未接收到第一STA反馈的数据帧，第一AP判定发送给STA的数据帧丢失，此时第一AP向第一STA重新发送数据帧。
本申请实施例提供的方案中，通过网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到该第一STA关联的第一AP发送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧，由于同组STA的应答帧延迟时长通常不同，使得同一AP不会同时接收到同组STA发送的应答帧，避免AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了消除AP的轮询开销，避免无线通信资源的浪费的效果。
本实施例中，当为每个STA分配应答帧延迟时长后，还需根据每个STA的应答帧延迟时长分别设置第一AP对于每个STA的确认超时时长，从而避免第一AP过早判断数据丢失启动重发流程。
在一种可能实现的方式中，仍参见图6，MIMO控制器可根据需要(比如在网络MIMO阶段结束后)主动向第一AP发送第一确认超时时长取消消息，来控制第一AP取消第一AP所连接部分或所有STA的确认超时时长。
步骤608，当接收到MIMO控制器发送的第一STA的第一确认超时时长取消消息时，第一AP向第一STA发送第一应答帧延迟时长取消消息。
STA的确认超时时间是MIMO控制器基于该STA的应答帧延迟时长设置的，为了避免MIMO控制器取消STA的确认超时时间后，第一AP过早判断数据丢失启动重发流程，在第一AP取消对应第一STA的确认超时时间后，还需要取消第一STA的应答帧延迟时长，使得第一STA和第一AP均恢复到默认机制。
其中，第一确认超时时长取消消息可能的消息格式至少有如下两种：
第一种如表11所示，第一确认超时时长取消消息的消息格式采用新的编码方式。
表11
Figure PCTCN2018112709-appb-000008
可选的，第一AP在对应关系中删除第一STA和第一确认超时时长之后，向MIMO控制器反馈确认取消消息。
需要说明的是，为了保证MIMO通信的可靠性，第一AP可向MIMO控制器回复携带有第一STA相关信息的复杂确认消息。为了减少网络开销，第一AP也可向MIMO控制器回复不携带有原有设置的简短确认消息。
对应的，复杂确认消息可能的消息格式如表12所示。(时间单位为：us)
表12
Figure PCTCN2018112709-appb-000009
对应的，简短确认消息可能的消息格式如表13所示。(时间单位为：us)
表13
Figure PCTCN2018112709-appb-000010
第二种如表14所示，第一确认超时时长取消消息的消息格式采用设置消息的消息格式，但将第一确认超时时长设为0。
当第一AP接收到MIMO控制器发送的第一STA的第一确认超时时长取消消息时，获取第一确认超时时长取消消息中携带的第一确认超时时长(0us)，将在对应关系中删除第一STA和第一确认超时时长。
表14
Figure PCTCN2018112709-appb-000011
可选的，在对应关系中删除第一STA和第一确认超时时长之后，第一AP向MIMO控制器反馈确认取消消息。
其中，复杂确认消息可能的消息格式如表15所示。(时间单位为：us)
表15
Figure PCTCN2018112709-appb-000012
其中，简短确认消息可能的消息格式如表16所示。(时间单位为：us)
表16
Type Len Value
00(消息类型) 1 2(表示简要设置回复)
01(消息标识) 2 消息ID
… … …
可选的，MIMO控制器以TLV格式向第一AP发送第一确认超时时长取消消息，第一AP以TLV格式向MIMO控制器反馈确认取消消息。
可选的，第一应答帧延迟时长取消消息的消息类型为所携带的应答帧延迟时长为0的第一指示帧。
可选的，第一应答帧延迟时长取消消息的消息类型为Action帧。比如，定义类别字段为16且说明字段为3的Action帧为取消应答帧延迟时长的第一指示帧，当接收到MIMO控制器发送的第一STA的第一确认超时时长取消消息时，第一AP向第一STA发送类别字段为16且说明字段为3的Action帧。
步骤609，当接收到第一AP发送的第一应答帧延迟时长取消消息时，第一STA删除存储的第一应答帧延迟时长。
当第一STA删除存储的第一应答帧延迟时长之后，第一STA恢复默认机制，即每当接收到第一AP发送的数据帧时，在SIFS之后向第一AP反馈应答帧。
可选的，第一STA在删除存储的第一应答帧延迟时长之后，向第一AP反馈确认取消消息。
需要说明的是，STA可以在媒体介入控制(Media Access Control，MAC)层通过ACK帧向第一AP反馈确认取消消息，也可以在协议交互层通过Action帧向第一AP反馈确认取消消息。
步骤610，第一AP在对应关系中删除第一STA和第一确认超时时长。
需要说明的是，图6所示步骤608至步骤610的执行位置仅为一种可能的实现方式，在实际应用中，步骤608至步骤610可在步骤601之后的任一位置实施，本实施例并不限定步骤608至步骤610在步骤601至步骤607中的执行位置。
在另一种可能实现的方式中，仍参见图6，MIMO控制器可根据需要(比如在网络MIMO阶段结束后)主动通过第一AP向第一STA发送第一应答帧延迟时长取消消息，来控制STA取消与应答帧延迟时长。当MIMO控制器可根据需要主动通过第一AP向第一STA发送第一应答帧延迟时长取消消息时，包括下述步骤：
步骤611，当接收到MIMO控制器发送的第一STA的第二应答帧延迟时长取消消息时，第一AP向第一STA发送第一应答帧延迟时长取消消息。
对应的，当接收到第一AP发送的第一应答帧延迟时长取消消息时，第一STA删除存储的第一应答帧延迟时长。
可选的，第一AP以聚合帧的形式向第一STA发送携带有取消应答帧延迟时长的第一指示帧，该聚合帧还包括数据帧。
可选的，为了避免第一STA对应的第一确认超时时长增加第一STA的网络时延，在第一AP向第一STA发送第一应答帧延迟时长取消消息后，第一AP在对应关系中删除第一STA和第一确认超时时长。
需要说明的是，步骤611在步骤609之前实施。
实施例三
MIMO控制器可在单独设置该应答帧延迟时长的使用次数，从而控制STA接收到数据帧后使用应答帧延迟时长的次数。
请参考图7，其示出了本申请再一个示例性实施例提供的应答帧延迟时长设置方法的流程图。本实施例以该方法用于如图1所示的应答帧延迟时长设置系统的系统架构中来举例说明，该方法包括以下几个步骤：
步骤701，MIMO控制器为第一STA分配第一应答帧延迟时长，设置第一应答帧延迟时长的使用次数。
步骤702，MIMO控制器向第一AP发送使用次数。
其中，第一AP为第一STA关联的AP。
步骤703，MIMO控制器获取第一STA对应的第一应答帧延迟时长。
步骤704，MIMO控制器向第一AP发送第一应答帧延迟时长。
需要说明的是，MIMO控制器可分别向第一AP发送第一应答帧延迟时长和该第一应答帧延迟时长的使用次数，也可以将第一应答帧延迟时长和该第一应答帧延迟时长的使用次 数合并为一条消息后发送至第一AP。
步骤705，第一AP向第一STA发送携带有第一STA对应的第一应答帧延迟时长和第一应答帧延迟时长对应的使用次数的第一指示帧。
可选的，第一指示帧可以用于指示单次延迟也可以用于指示多次延迟。指示单次延迟时，该第一指示帧所携带的第一应答帧延迟时长仅能使用一次；指示多次延迟时，该第一指示帧携带有第一应答帧延迟时长对应的使用次数。
需要说明的是，第一指示帧还有取消应答帧延迟时长的功能，不同的功能通过第一指示帧中的Action Details字段的ACK延迟时间域(类型)进行区分。
其中，表17所示为第一指示帧的说明字段中ACK延迟时间域可能的含义，ACK延迟时间域的含义即为第一指示帧的含义。需要说明的是，表17中ACK延迟时间域与含义的对应关系并不对ACK延迟时间域对应的含义构成限定。
表17
ACK延迟时间域 含义
0 延迟值单次有效
1 延迟值多次有效
2 取消延迟值
3-255 保留
表18所示为第一指示帧用于指示单次延迟时可能的帧格式。
表18
ACK延迟时间域 延迟时间高位 延迟时间低位
0(单次延迟) 时间高8位 时间低8位
表19所示为第一指示帧用于指示多次延迟时可能的帧格式。
表19
ACK延迟时间域 延迟时间高位 延迟时间低位 延迟次数高位 延迟次数低位
1(多次延迟) 时间高8位 时间低8位 时间高8位 时间低8位
需要说明的是，该使用次数是MIMO控制器为第一STA分配对应的第一应答帧延迟时长时设置的。
步骤706，第一STA接收第一AP发送的第一指示帧，获取并存储第一指示帧中携带的第一STA对应的第一应答帧延迟时长和第一应答帧延迟时长对应的使用次数。
步骤707，每当接收到第一AP发送的数据帧时，第一STA将存储的第一应答帧延迟时长对应的使用次数减1。
步骤708，如果减1后的第一应答帧延迟时长对应的使用次数小于0，第一STA则删除第一应答帧延迟时长和第一应答帧延迟时长对应的使用次数，并推迟默认延迟时长后，向第一AP反馈应答帧。
如果减1后的第一应答帧延迟时长对应的使用次数小于0，说明减1前使用次数已经用尽，第一STA则删除第一应答帧延迟时长和第一应答帧延迟时长对应的使用次数，并执行默认机制，推迟默认延迟时长后，向第一AP反馈应答帧。
需要说明的是，在本实施例中，当第一STA接收到第一AP发送的第一应答帧延迟时长取消消息时，即使第一应答帧延迟时长对应的使用次数大于0，第一STA仍会删除存储的第一应答帧延迟时长，执行默认机制。
步骤709，如果减1后的第一应答帧延迟时长对应的使用次数不小于0，第一STA则推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
如果减1后的第一应答帧延迟时长对应的使用次数不小于0，说明减1前使用次数未用尽，第一STA则推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
需要说明的是，本实施例是以先减去使用次数再判断使用次数是否用尽，在实际应用中，也可以先判断使用次数是否用尽再减去使用次数。此时步骤707至步骤709可被下述步骤Q1至步骤Q3替代：
步骤Q1，每当接收到第一AP发送的数据帧时，第一STA判断存储的第一应答帧延迟时长对应的使用次数是否为0。
步骤Q2，如果存储的第一应答帧延迟时长对应的使用次数为0，第一STA则删除第一确认超时时长和第一应答帧延迟时长对应的使用次数，并推迟默认延迟时长后，向第一AP反馈应答帧。
步骤Q3，如果存储的第一应答帧延迟时长对应的使用次数不为0，第一STA将存储的第一应答帧延迟时长对应的使用次数减1，并推迟第一应答帧延迟时长后，向第一AP反馈应答帧。
本申请实施例提供的方案中，通过网络设备向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到该第一STA关联的第一AP发送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧，由于同组STA的应答帧延迟时长通常不同，使得同一AP不会同时接收到同组STA发送的应答帧，避免AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了消除AP的轮询开销，避免无线通信资源的浪费的效果。
本实施例中，MIMO控制器可在单独设置该应答帧延迟时长的使用次数，从而控制STA接收到数据帧后使用应答帧延迟时长的次数。
实施例四
当多个STA为同组STA时，该多个STA同时向AP反馈的应答帧之间易产生冲突，为了避免同组的STA同时向AP反馈反馈的应答帧，该多个STA对应的应答帧延迟时长不同。请参考图8，其示出了本申请又一个示例性实施例提供的应答帧延迟时长设置方法的流程图。本实施例以该方法用于如图1所示的应答帧延迟时长设置系统的系统架构中来举例说明，该方法包括以下几个步骤：
步骤801，网络设备获取第一移动站STA对应的第一应答帧延迟时长。
步骤802，网络设备向第一STA发送第一应答帧延迟时长，以使第一STA在接收到数据帧时，推迟第一应答帧延迟时长后反馈应答帧。
步骤803，网络设备获取第二STA对应的第二应答帧延迟时长。
步骤804，网络设备向第二STA发送第二应答帧延迟时长，以使第二STA在接收到数据帧时，推迟第二应答帧延迟时长后反馈应答帧。
需要说明的是，第一STA与第二STA为同组STA，这两个STA至少满足下述一种情况：
第一种情况，第一STA与第二STA关联同一AP，且该AP欲同时向第一STA与第二STA发送数据帧。
第二种情况，第一STA所关联的第一AP与第二STA所关联的第二AP工作频段相同，且第一AP向第一STA发送数据帧的同时，第二AP也向第二STA发送数据帧。
当第一STA与第二STA为同组STA，网络设备可为第一STA和第二STA设置不同的应答帧延迟时长(即第一应答帧延迟时长与第二应答帧延迟时长不同)；或者为第一STA和第二STA设置不同的应答帧延迟时长(即第一应答帧延迟时长与第二应答帧延迟时长相同)，但不同时向第一STA与第二STA发送数据帧。
本申请实施例提供的方案中，通过第一AP向第一STA发送携带有第一应答帧延迟时长的第一指示帧，以使第一STA在接收到第一AP发送的数据帧时，推迟第一应答帧延迟时长后，向第一AP反馈应答帧，由于同组STA的应答帧延迟时长各不相同，使得同一AP不会同时接收到同组STA发送的应答帧，避免第一AP由于应答帧和数据帧之间，以及应答帧和应答帧之间的冲突，错误地判定未接收到STA发送的应答帧，从而达到了降低第一AP的轮询开销，避免网络资源的浪费的效果。
本实施例中，为了避免同组的STA同时向AP反馈反馈的应答帧，该多个STA对应的应答帧延迟时长不同。
图9是本申请一个示例性实施例提供的现有数据传输流程与本申请所涉及的数据传输流程的对比示意图。如图9所示，以2个AP，2个STA，数据流长度500us进行举例。
现有数据传输流程：AP1和AP2在网络MIMO阶段，分别向STA1和STA2发送数据(500us)之后，STA1和STA2反馈应答帧(24us)，此时STA1和STA2反馈的应答帧之间产生ACK冲突，由于AP1和AP2均收不到对应的STA发送的应答帧，因此AP1和AP2开始竞争空口媒介(34us+63us)。假设AP1获得媒介访问权后发出BAR(24us)，STA1在BAR后的SIFS发出BA(24us)，AP1收到STA1发出的BA后确认STA1收到AP1在网络MIMO阶段发出的数据。AP2经过退避(34us+63us)后发出给STA2的BAR(24us)，STA2在BAR后的SIFS发出BA(24us)，AP2收到STA1发出的BA后确认STA1收到AP1在网络MIMO阶段发出的数据。
由此可知，现有数据传输流程中一旦产生ACK冲突，通过BAR和BA交互的方式来确认STA1和STA2是否接受到数据所需时长为362us。
本申请所涉及的数据传输流程：AP1和AP2分别向STA1和STA2发送数据和对应的携带有应答帧延迟时长的第一指示帧(504us)，其中，STA1对应的应答帧延迟时长为16us，STA2对应的应答帧延迟时长为40us。STA1接收到AP1发送的数据和第一指示帧后，推迟16us向AP反馈应答帧(24us)，STA2接收到AP2发送的数据和第一指示帧后，推迟40us向AP反馈应答帧(24us)，AP1和AP2均接收到对应的STA发送的应答帧。
由此可知，本申请所涉及的数据传输流程能有效避免ACK冲突，确认STA1和STA2是否接受到数据所需时长为64us。
对比现有数据传输流程和本申请所涉及的数据传输流程，本申请所涉及的数据传输流程在数据发送阶段增加了4us，在确认STA1和STA2是否接受到数据阶段节省了298(362-64)us，整个流程总节省294us。
上述主要从网络设备和STA交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，网络设备和STA为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。结合本申请中所公开的实施例描述的各示例的单元及算法步骤，本申请实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。本领域技术人员可以对每个特定的应用来使用不同的方法来实现所描述的功能，但是这种实现不应认为超出本申请实施例的技术方案的范围。
图10示出了本申请实施例所涉及的网络设备的一种可能的结构示意图。
网络设备1000包括发射器/接收器1001和处理器1002。其中，处理器1002也可以为控制器，图10中表示为“控制器/处理器1002”。所述发射器/接收器1001用于支持网络设备与上述实施例中的所述STA之间收发信息，以及支持所述STA与其他STA之间进行无线电通信。所述处理器1002执行各种用于与STA通信的功能。在上行链路，来自所述STA的上行链路信号经由天线接收，由接收器1001进行解调(例如将高频信号解调为基带信号)，并进一步由处理器1002进行处理来恢复STA所发送到业务数据和信令信息。在下行链路上，业务数据和信令消息由处理器1002进行处理，并由发射器1001进行调制(例如将基带信号调制为高频信号)来产生下行链路信号，并经由天线发射给STA。需要说明的是，上述解调或调制的功能也可以由处理器1002完成。例如，处理器1003还用于执行图10中步骤1002的过程和/或本申请所描述的技术方案的其他过程。
进一步的，网络设备1000还可以包括存储器1003，存储器1003用于存储网络设备1000的程序代码和数据。此外，网络设备还可以包括收发器1004。收发器1004用于支持网络设备与其他网络实体(例如核心网中的网络设备等)进行通信。例如，在LTE系统中，该收发器1004可以是S1-U接口，用于支持网络设备与服务网关(Serving Gateway，简称SGW)进行通信；或者，该收发器1004也可以是S1-MME接口，用于支持网络设备与移动性管理实体(Mobility Management Entity，简称MME)进行通信。
可以理解的是，图10仅仅示出了网络设备1000的简化设计。在实际应用中，网络设备1000可以包含任意数量的发射器，接收器，处理器，控制器，存储器，收发器等，而所有可以实现本申请实施例的网络设备都在本申请实施例的保护范围之内。
图11示出了本申请实施例中所涉及的第一STA的一种可能的设计结构的简化示意图。所述第一STA1100包括发射器1101，接收器1102和处理器1103。其中，处理器1103也可以为控制器，图11中表示为“控制器/处理器1103”。可选的，所述第一STA1100还可以包括调制解调处理器1104，其中，调制解调处理器1104可以包括编码器1105、调制器1106、解码器1107和解调器1108。
在一个示例中，发射器1101调节(例如，模拟转换、滤波、放大和上变频等)该输出采 样并生成上行链路信号，该上行链路信号经由天线发射给上述实施例中所述的网络设备。在下行链路上，天线接收上述实施例中网络设备发射的下行链路信号。接收器1102调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。在调制解调处理器1106中，编码器1108接收要在上行链路上发送的业务数据和信令消息，并对业务数据和信令消息进行处理(例如，格式化、编码和交织)。调制器1108进一步处理(例如，符号映射和调制)编码后的业务数据和信令消息并提供输出采样。解调器1010处理(例如，解调)该输入采样并提供符号估计。解码器1109处理(例如，解交织和解码)该符号估计并提供发送给第一STA1100的已解码的数据和信令消息。编码器1108、调制器1108、解调器1010和解码器1109可以由合成的调制解调处理器1106来实现。这些单元根据无线接入网采用的无线接入技术(例如，LTE及其他演进系统的接入技术)来进行处理。需要说明的是，当第一STA1100不包括调制解调处理器1106时，调制解调处理器1106的上述功能也可以由处理器1103完成。
处理器1103对第一STA1100的动作进行控制管理，用于执行上述本申请实施例中由第一STA1100进行的处理过程。例如，处理器1103还用于执行图6中步骤804的过程和/或本申请所描述的技术方案的其他过程。
进一步的，第一STA1100还可以包括存储器1109，存储器1109用于存储用于第一STA1100的程序代码和数据。
用于执行本申请实施例上述网络设备、第一STA的功能的处理器可以是中央处理器(Central Processing Unit，CPU)，通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(网络设备plication-Specific Integrated Circuit，ASIC)，现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。其可以实现或执行结合本申请实施例公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
结合本申请实施例公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(Random Access Memory，RAM)、闪存、只读存储器(Read Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于网络设备或第一STA中。当然，处理器和存储介质也可以作为分立组件存在于网络设备或第一STA中。
请参考图12A，其示出了本申请一个实施例提供的应答帧延迟时长设置装置的框图。该应答帧延迟时长设置装置可以通过软件、硬件或者两者的结合实现成为网络设备的全部或者一部分。该应答帧延迟时长设置装置可以包括：获取模块1201和发送模块1202。
获取模块1201，用于实现上述步骤501的功能。
发送模块1202，用于实现上述步骤502的功能。
相关细节可结合参考上述方法实施例。
在另一个可选的实施例中，上述获取模块，用于实现步骤603、步骤703、步骤801和步骤803中至少一个步骤的功能。
上述发送模块1202，用于实现步骤605、步骤607、步骤608、步骤611、步骤702、步骤704、步骤705、步骤802和步骤804中至少一个步骤的功能。
参见图12B，其示出了本申请一个实施例提供的应答帧延迟时长设置装置的框图。该应答帧延迟时长设置装置可以包括：接收模块1203、设置模块1204、删除模块1205和第二设置模块1206。
接收模块1203，用于实现上述步骤601的功能。
设置模块1204，用于实现上述步骤602和步骤701中至少一个步骤的功能。
删除模块1205，用于实现上述步骤610的功能。
需要说明的是，上述获取模块1201可以由图3中的处理器31执行存储器34中的获取模块程序361实现；上述发送模块1202可以由图3中的处理器31执行存储器34中的发送模块程序362实现；上述接收模块1203可以由图3中的处理器31执行存储器34中的接收模块程序364实现；上述设置模块1204可以由图3中的处理器31执行存储器34中的设置模块程序363实现；上述删除模块1205可以由图3中的处理器31执行存储器34中的删除模块程序365实现。
请参考图13A，其示出了本申请另一个实施例提供的应答帧延迟时长设置装置的框图。该应答帧延迟时长设置装置可以通过软件、硬件或者两者的结合实现成为第一STA的全部或者一部分。该应答帧延迟时长设置装置可以包括：接收模块1301和反馈模块1302。
接收模块1301，用于实现上述步骤503的功能。
反馈模块1302，用于实现上述步骤504的功能。
相关细节可结合参考上述方法实施例。
在另一个可选的实施例中，上述接收模块1301，用于实现步骤604和步骤706中至少一个步骤的功能。
上述反馈模块1302，用于实现步骤606、步骤708、步骤709中至少一个步骤的功能。
参见图13B，其示出了本申请另一个实施例提供的应答帧延迟时长设置装置的框图。该应答帧延迟时长设置装置可以包括：删除模块1303和计算模块1304。
删除模块1303，用于实现上述步骤609的功能。
计算模块1304，用于实现上述步骤707的功能。
需要说明的是，上述接收模块1301可以由图4中的处理器41执行存储器44中的接收模块程序461实现；上述反馈模块1302可以由图4中的处理器41执行存储器44中的反馈模块程序462实现；删除模块1303可以由图4中的处理器41执行存储器44中的删除模块程序463实现，计算模块1304可以由图4中的处理器41执行存储器44中的计算模块程序464实现。
需要说明的是：上述实施例提供的应答帧延迟时长设置装置在设置应答帧延迟时长时，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将网络设备的内部结构划分成不同的功能模块和STA的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。另外，上述实施例提供的应答帧延迟时长设置装置与应答帧延迟时长设置方法实施例属于同一构思，其具体实现过程详见方法实施例，这里不再赘述。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (27)

  1. 一种应答帧延迟时长设置方法，其特征在于，应用于网络设备，所述方法包括：
    获取第一移动站STA对应的第一应答帧延迟时长；
    向所述第一STA发送所述第一应答帧延迟时长，以使所述第一STA在接收到数据帧时，推迟所述第一应答帧延迟时长后反馈应答帧。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    获取第二STA对应的第二应答帧延迟时长，所述第二STA与所述第一STA为同组STA；
    向所述第二STA发送所述第二应答帧延迟时长，以使所述第二STA在接收到数据帧时，推迟所述第二应答帧延迟时长后反馈应答帧。
  3. 根据权利要求1所述的方法，其特征在于，所述网络设备为多输入多输出MIMO控制器，在所述获取第一移动站STA对应的第一应答帧延迟时长之前，所述方法还包括：
    为所述第一STA分配第一应答帧延迟时长；
    所述向所述第一STA发送所述第一应答帧延迟时长，包括：
    向第一接入点AP发送所述第一应答帧延迟时长，由所述第一AP将所述第一应答帧延迟时长转发至所述第一STA，所述第一AP为所述第一STA关联的AP。
  4. 根据权利要求3所述的方法，其特征在于，在所述为所述第一STA分配第一应答帧延迟时长之后，所述方法还包括：
    设置所述第一应答帧延迟时长的使用次数；
    向所述第一AP发送所述使用次数，由所述第一AP将所述使用次数转发至所述第一STA。
  5. 根据权利要求1所述的方法，其特征在于，所述网络设备为第一AP，在所述获取第一移动站STA对应的第一应答帧延迟时长之前，所述方法还包括：
    接收MIMO控制器发送的所述第一STA对应的第一确认超时时长，将所述第一STA与所述第一确认超时时长，添加到预先存储的STA和确认超时时长的对应关系中；
    根据所述第一确认超时时长设置所述第一STA对应的第一应答帧延迟时长，所述第一确认超时时长大于所述第一应答帧延迟时长；
    所述向所述第一STA发送所述第一应答帧延迟时长，包括：
    向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧。
  6. 根据权利要求5所述的方法，其特征在于，所述向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，包括：
    以聚合帧的形式向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，所述聚合帧还包括数据帧。
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    在向所述第一STA发送数据帧之后，如果在所述第一确认超时时长内未接收到所述第一STA反馈的数据帧，则向所述第一STA重新发送所述数据帧。
  8. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    当接收到所述MIMO控制器发送的所述第一STA的第一确认超时时长取消消息时，向所述第一STA发送第一应答帧延迟时长取消消息，以使所述第一STA删除存储的所述第一应答帧延迟时长；
    在所述对应关系中删除所述第一STA和所述第一确认超时时长。
  9. 一种应答帧延迟时长设置方法，其特征在于，应用于第一STA，所述方法包括：
    接收第一AP发送的第一指示帧，获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长，所述第一AP为所述第一STA关联的AP；
    每当接收到所述第一AP发送的数据帧时，推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
  10. 根据权利要求9所述的方法，其特征在于，所述接收第一AP发送的第一指示帧，包括：
    接收所述第一AP发送的聚合帧，得到所述聚合帧中包括的第一指示帧和数据帧，并推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
  11. 根据权利要求9所述的方法，其特征在于，所述第一指示帧中还携带有所述第一应答帧延迟时长对应的使用次数，所述获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长，包括：
    获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长和所述第一应答帧延迟时长对应的使用次数；
    所述推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧，包括：
    将存储的所述第一应答帧延迟时长对应的使用次数减1；
    如果减1后的第一应答帧延迟时长对应的使用次数小于0，则删除所述第一应答帧延迟时长和所述第一应答帧延迟时长对应的使用次数，并推迟默认延迟时长后，向所述第一AP反馈应答帧；
    如果减1后的第一应答帧延迟时长对应的使用次数不小于0，则推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
  12. 一种应答帧延迟时长设置装置，其特征在于，应用于网络设备，所述装置包括：
    获取模块，用于获取第一移动站STA对应的第一应答帧延迟时长；
    发送模块，用于向所述第一STA发送所述第一应答帧延迟时长，以使所述第一STA在接收到数据帧时，推迟所述第一应答帧延迟时长后反馈应答帧。
  13. 根据权利要求12所述的装置，其特征在于，所述装置还包括：
    所述获取模块，还用于获取第二STA对应的第二应答帧延迟时长，所述第二STA与所述第一STA为同组STA；
    所述发送模块，还用于向所述第二STA发送携带有所述第二应答帧延迟时长的第二指示帧，以使所述第二STA在接收到数据帧时，推迟所述第二应答帧延迟时长后反馈应答帧。
  14. 根据权利要求12所述的装置，其特征在于，所述网络设备为MIMO控制器，所述装置还包括：
    设置模块，用于在所述获取第一移动站STA对应的第一应答帧延迟时长之前，为所述第一STA分配第一应答帧延迟时长；
    所述发送模块，还用于向第一接入点AP发送所述第一应答帧延迟时长，由所述第一AP将所述第一应答帧延迟时长转发至所述第一STA，所述第一AP为所述第一STA关联的AP。
  15. 根据权利要求14所述的装置，其特征在于，所述装置还包括：
    所述设置模块，还用于在所述为所述第一STA分配第一应答帧延迟时长之后，设置所述第一应答帧延迟时长的使用次数；
    所述发送模块，还用于向所述第一AP发送所述使用次数，由所述第一AP将所述使用次数转发至所述第一STA。
  16. 根据权利要求12所述的装置，其特征在于，所述网络设备为第一AP，所述装置还包括：
    接收模块，用于在所述获取第一移动站STA对应的第一应答帧延迟时长之前，接收MIMO控制器发送的所述第一STA对应的第一确认超时时长，将所述第一STA与所述第一确认超时时长，添加到预先存储的STA和确认超时时长的对应关系中；
    所述设置模块，还用于根据所述第一确认超时时长设置所述第一STA对应的第一应答帧延迟时长，所述第一确认超时时长大于所述第一应答帧延迟时长。
  17. 根据权利要求16所述的装置，其特征在于，所述发送模块，还用于以聚合帧的形式向所述第一STA发送携带有所述第一应答帧延迟时长的第一指示帧，所述聚合帧还包括数据帧。
  18. 根据权利要求17所述的装置，其特征在于，所述装置还包括：
    所述发送模块，还用于在向所述第一STA发送数据帧之后，如果在所述第一确认超时时长内未接收到所述第一STA反馈的数据帧，则向所述第一STA重新发送所述数据帧。
  19. 根据权利要求16所述的装置，其特征在于，所述装置还包括：
    所述发送模块，还用于当接收到所述MIMO控制器发送的所述第一STA的第一确认超时时长取消消息时，向所述第一STA发送第一应答帧延迟时长取消消息，以使所述第一STA删除存储的所述第一应答帧延迟时长；
    删除模块，用于在所述对应关系中删除所述第一STA和所述第一确认超时时长。
  20. 一种应答帧延迟时长设置装置，其特征在于，应用于第一STA，所述装置包括：
    接收模块，用于接收第一AP发送的第一指示帧，获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长，所述第一AP为所述第一STA关联的AP；
    反馈模块，用于每当接收到所述第一AP发送的数据帧时，推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
  21. 根据权利要求20所述的装置，其特征在于，所述接收模块，还用于接收所述第一AP发送的聚合帧，得到所述聚合帧中包括的第一指示帧和数据帧，并推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
  22. 根据权利要求20所述的装置，其特征在于，所述第一指示帧中还携带有所述第一应答帧延迟时长对应的使用次数，所述获取模块，还用于获取并存储所述第一指示帧中携带的所述第一STA对应的第一应答帧延迟时长和所述第一应答帧延迟时长对应的使用次数；
    所述反馈模块，还用于：
    将存储的所述第一应答帧延迟时长对应的使用次数减1；
    如果减1后的第一应答帧延迟时长对应的使用次数小于0，则删除所述第一应答帧延迟时长和所述第一应答帧延迟时长对应的使用次数，并推迟默认延迟时长后，向所述第一AP反馈应答帧；
    如果减1后的第一应答帧延迟时长对应的使用次数不小于0，则推迟所述第一应答帧延迟时长后，向所述第一AP反馈应答帧。
  23. 一种网络设备，其特征在于，所述网络设备包括处理器和存储器，所述存储器中存储有至少一条指令，所述至少一条指令由所述处理器加载并执行以实现如权利要求1至8任一所述的应答帧延迟时长设置方法。
  24. 一种第一STA，其特征在于，所述第一STA包括处理器和存储器，所述存储器中存储有至少一条指令，所述至少一条指令由所述处理器加载并执行以实现如权利要求9至11任一所述的应答帧延迟时长设置方法。
  25. 一种应答帧延迟时长设置系统，其特征在于，所述系统包括网络设备和STA；
    所述网络设备包括如权利要求12至19任一项所述的应答帧延迟时长设置装置；或，所述网络设备包括如权利要求23所述的网络设备；
    所述STA包括如权利要求20至22任一项所述的应答帧延迟时长设置装置；或，所述STA包括如权利要求24所述的第一STA。
  26. 一种计算机可读存储介质，所述计算机可读存储介质中存储有至少一条指令，至少一条指令由处理器加载并执行以实现权利要求1至8任一所述的应答帧延迟时长设置方法。
  27. 一种计算机可读存储介质，所述计算机可读存储介质中存储有至少一条指令，至少一条指令由处理器加载并执行以实现权利要求9至11任一所述的应答帧延迟时长设置方法。
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CN109756929B (zh) 2021-03-30
CN109756929A (zh) 2019-05-14
EP3694248A1 (en) 2020-08-12
JP2021502034A (ja) 2021-01-21
EP3694248A4 (en) 2020-11-25

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