CN109151958B - Communication method, communication device and communication equipment of wireless local area network - Google Patents
Communication method, communication device and communication equipment of wireless local area network Download PDFInfo
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- CN109151958B CN109151958B CN201710505942.9A CN201710505942A CN109151958B CN 109151958 B CN109151958 B CN 109151958B CN 201710505942 A CN201710505942 A CN 201710505942A CN 109151958 B CN109151958 B CN 109151958B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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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
- H04L1/1848—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/085—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a communication method, a communication device and communication equipment of a wireless local area network, wherein the communication method of the wireless local area network for access point equipment comprises the following steps: sending a unicast awakening message frame to station equipment by adopting a first competition window parameter competition channel resource at a first time point; and when the feedback of the station equipment for the unicast wakeup message frame is not received, retransmitting the unicast wakeup message frame to the station equipment by adopting a second contention window parameter contention channel resource at a second moment, wherein the first contention window parameter and the second contention window parameter are any contention window parameter in a first contention window parameter interval, and the threshold values of the first contention window parameter and the second contention window parameter are the same. By the technical scheme, the power consumption of the equipment can be effectively reduced, the equipment is more power-saving, and the requirements of IEEE802.11ba are met.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communication method of a wireless local area network, a communication apparatus of the wireless local area network, and a communication device.
Background
In the year 2016, 7, IEEE (Institute of Electrical and Electronics Engineers) 802.11 established the research group WUR (wake Up receiver) of the next generation Wi-Fi (Wireless Fidelity) technology, i.e., IEEE 802.11.ba, which is mainly applied in the aspect of internet of things, in order to save the power consumption of devices as much as possible, and most importantly, in order to make devices receiving wake-Up frames (wake-Up message frames, i.e., WUR message frames) save the power consumption of devices as much as possible, wherein the power consumption required for devices to receive wake-Up frames is not more than 1 mW.
At present, when an Access Point (AP) device sends a unicast wake-up frame to a Station (STA) device, if a response frame of the Station device to the wake-up frame is not received, the AP device may determine that the wake-up frame sent by the AP device needs to be retransmitted, but an existing random Back-off (backoff) mechanism is still used for retransmission of the wake-up frame, power consumption of the device may be as much as that of the existing retransmission mechanism, and in addition, a receiving party waits too long time, so that the purpose of saving power consumption of the device cannot be achieved.
Therefore, how to retransmit the unicast wake-up frame when the AP device fails to send the unicast wake-up frame to the station device reduces the power consumption of the device, so that the device is more power-saving, and the requirement of ieee802.11ba is met, which is a technical problem to be solved urgently.
Disclosure of Invention
Based on at least one of the above technical problems, the present invention provides a new communication scheme for a wireless local area network, and when an access point device retransmits a unicast wakeup message frame to a station device, a random backoff CW (Contention Window) mechanism is used, which can effectively reduce the power consumption of the device, thereby saving power for the device and meeting the requirements of IEEE802.11 ba.
In view of this, according to a first aspect of the present invention, a communication method of a wireless local area network is provided, which is used for an access point device, and the communication method of the wireless local area network includes: sending a unicast awakening message frame to station equipment by adopting a first competition window parameter competition channel resource at a first time point; and when the feedback of the station equipment for the unicast wakeup message frame is not received, retransmitting the unicast wakeup message frame to the station equipment by adopting a second contention window parameter contention channel resource at a second moment, wherein the first contention window parameter and the second contention window parameter are any contention window parameter in a first contention window parameter interval, and the threshold values of the first contention window parameter and the second contention window parameter are the same.
In the technical scheme, when the access point device determines that the unicast wakeup message frame sent to the station device by the access point device fails to be sent, that is, when the corresponding feedback of the station device is not received within a certain time after the unicast wakeup message frame is sent to the station device by using a first contention window parameter contention channel resource at a first time point, the unicast wakeup message frame can be sent to the station device again by using a second contention window parameter contention channel resource at a second time point, so that a secondary communication interface of the station device wakes up a main communication interface of the station device to receive downlink data cached by the access point device when the unicast wakeup message frame is successfully received, thereby effectively reducing the power consumption of the device, enabling the device to be more power-saving and meeting the requirements of IEEE802.1ba; wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, device power consumption is also saved.
In the foregoing technical solution, preferably, after the second contention window parameter contention channel resource is adopted to resend the unicast wakeup message frame to the station device, the method further includes: counting the transmission times of retransmitting the unicast awakening message frame; and determining whether to continuously retransmit the unicast wakeup message frame to the site equipment according to the comparison result of the transmission times and a preset threshold value.
In the technical solution, in order to further reduce the power consumption of the device and enable the device to save more power, the number of times of retransmitting the unicast wakeup message frame to the station device in the same contention window parameter interval may be limited, specifically, after the first retransmission is started, the number of times of retransmitting the unicast wakeup message frame may be counted, that is, the number of times of transmission counted in sequence is updated every time of retransmission, and then compared with a preset threshold (for example, 3 times, where a specific value is determined according to actual conditions) to determine whether to continue to retransmit the unicast wakeup message frame according to a comparison result, if the preset threshold is not exceeded, the retransmission of the unicast wakeup message frame may be continued, otherwise, the retransmission of the unicast wakeup message frame to the station device may be stopped, and meanwhile, a method of increasing a threshold of a CW parameter may also be used to retransmit, for example, the threshold of the number of retransmission of a certain wakeup message frame is 3, if the transmission is not successful under the condition of adopting the threshold value of the same CW parameter, the existing Back-off mechanism can be adopted to increase the threshold value of the CW parameter for retransmission.
In any of the above technical solutions, preferably, the communication method of the wireless local area network further includes: after the retransmission of the unicast wakeup message frame by using the second contention window parameter contention access channel fails, the first contention window parameter interval is increased to be a second contention window parameter interval, so that the unicast wakeup message frame is retransmitted by using any contention window parameter contention channel resource in the second contention window parameter interval.
In the technical scheme, when the retransmission of the unicast wakeup message frame by taking the second contention window parameter from the first contention window parameter interval cannot be successful, the first contention window interval may be increased to be the second contention window parameter interval, and any contention window parameter contention channel resource in the second contention window parameter interval is continuously taken to retransmit the unicast wakeup message frame, so as to improve the probability of retransmitting the unicast wakeup message frame to the station device.
Further, the transmission times of the retransmitted unicast wakeup message frame counted in the first contention window parameter interval can be reset to zero, and the retransmission is performed by using the contention window parameter in the second contention window parameter interval, so as to perform comparison according to a preset threshold, and determine whether to continue retransmitting the unicast wakeup message frame to the station device according to the comparison result.
In any of the foregoing technical solutions, preferably, a duration of an interval between the second time point and the first time point is a timeout duration for the access point device to wait for the station device to feed back the unicast wakeup message frame.
In the technical scheme, the interval duration between the second time point and the previous first time point for retransmitting the unicast wakeup message frame to the site equipment is at least the timeout duration for waiting for the site equipment to perform feedback response on the unicast wakeup message frame, and further, the timeout duration refers to the sum of the duration for processing the unicast wakeup message frame inside the equipment, the duration for converting the secondary communication interface of the site equipment to the primary communication interface of the site equipment and the duration for competing for accessing a channel, so that the accuracy of the result for determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, unnecessary equipment power consumption is avoided, the equipment is more power-saving, and the requirement of IEEE802.11ba is met.
According to the second aspect of the present invention, there is further provided a communication apparatus of a wireless local area network, configured to be used in an access point device, where the communication apparatus of the wireless local area network includes a sending module, and the sending module is configured to: sending a unicast awakening message frame to station equipment by adopting a first competition window parameter competition channel resource at a first time point; and when the feedback of the station equipment for the unicast wakeup message frame is not received, retransmitting the unicast wakeup message frame to the station equipment by adopting a second contention window parameter contention channel resource at a second moment, wherein the first contention window parameter and the second contention window parameter are any contention window parameter in a first contention window parameter interval, and the threshold values of the first contention window parameter and the second contention window parameter are the same.
In the technical scheme, when the access point device determines that the unicast wakeup message frame sent to the station device by the access point device fails to be sent, that is, when the corresponding feedback of the station device is not received within a certain time after the unicast wakeup message frame is sent to the station device by the access point device by adopting the first contention window parameter contention channel resource at the first time point, the unicast wakeup message frame can be sent to the station device again by adopting the second contention window parameter contention channel resource at the second time point, so that the secondary communication interface of the station device wakes up the primary communication interface to receive the downlink data cached by the access point device when the unicast wakeup message frame is successfully received, thereby effectively reducing the power consumption of the device, enabling the device to be more power-saving and meeting the requirements of IEEE802.11 ba; wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, device power consumption is also saved.
In the foregoing technical solution, preferably, the communication apparatus of the wireless local area network further includes: a counting module, configured to count the number of times of transmission for retransmitting the unicast wakeup message frame after the sending module retransmits the unicast wakeup message frame to the site device by using the second contention window parameter contention channel resource; and the determining module is used for determining whether to continuously retransmit the unicast awakening message frame to the site equipment according to the comparison result of the transmission times counted by the counting module and a preset threshold value.
In the technical solution, in order to further reduce the power consumption of the device and enable the device to save more power, the number of times of retransmitting the unicast wakeup message frame to the station device in the same contention window parameter interval may be limited, specifically, after the first retransmission is started, the number of times of retransmitting the unicast wakeup message frame may be counted, that is, the number of times of transmission counted in sequence is updated every time of retransmission, and then compared with a preset threshold (for example, 3 times, where a specific value is determined according to actual conditions) to determine whether to continue to retransmit the unicast wakeup message frame according to a comparison result, if the preset threshold is not exceeded, the retransmission of the unicast wakeup message frame may be continued, otherwise, the retransmission of the unicast wakeup message frame to the station device may be stopped, and meanwhile, a method of increasing a threshold of a CW parameter may also be used to retransmit, for example, the threshold of the number of retransmission of a certain wakeup message frame is 3, if the transmission is not successful under the condition of adopting the threshold value of the same CW parameter, the existing Back-off mechanism can be adopted to increase the threshold value of the CW parameter for retransmission.
In any of the above technical solutions, preferably, the communication apparatus of the wireless local area network further includes: and the processing module is used for increasing the first contention window parameter interval to a second contention window parameter interval after the retransmission of the unicast wakeup message frame by using the second contention window parameter contention access channel fails, so as to retransmit the unicast wakeup message frame by using any contention window parameter contention channel resource in the second contention window parameter interval.
In the technical scheme, when the retransmission of the unicast wakeup message frame by taking the second contention window parameter from the first contention window parameter interval cannot be successful, the first contention window interval may be increased to be the second contention window parameter interval, and any contention window parameter contention channel resource in the second contention window parameter interval is continuously taken to retransmit the unicast wakeup message frame, so as to improve the probability of retransmitting the unicast wakeup message frame to the station device.
Further, the transmission times of the retransmitted unicast wakeup message frame counted in the first contention window parameter interval can be reset to zero, and the retransmission is performed by using the contention window parameter in the second contention window parameter interval, so as to perform comparison according to a preset threshold, and determine whether to continue retransmitting the unicast wakeup message frame to the station device according to the comparison result.
In any of the foregoing technical solutions, preferably, a duration of an interval between the second time point and the first time point is a timeout duration for the access point device to wait for the station device to feed back the unicast wakeup message frame.
In the technical scheme, the interval duration between the second time point and the previous first time point for retransmitting the unicast wakeup message frame to the site equipment is at least the timeout duration for waiting for the site equipment to perform feedback response on the unicast wakeup message frame, and further, the timeout duration refers to the sum of the duration for processing the unicast wakeup message frame inside the equipment, the duration for converting the secondary communication interface of the site equipment to the primary communication interface of the site equipment and the duration for competing for accessing a channel, so that the accuracy of the result for determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, unnecessary equipment power consumption is avoided, the equipment is more power-saving, and the requirement of IEEE802.11ba is met.
According to the third aspect of the present invention, there is further provided a communication method of a wireless local area network, where the communication method of the wireless local area network is used for a station device, and the communication method of the wireless local area network includes: receiving a unicast awakening message frame retransmitted by access point equipment at a second time point by adopting a second competition window parameter competition access channel after the access point equipment fails to adopt a first competition window parameter competition channel resource to send the unicast awakening message frame at the first time point; and waking up a main communication interface of the station equipment according to the unicast wake-up message frame retransmitted by the access point equipment, wherein the second contention window parameter is any contention window parameter in a first contention window parameter interval in which the first contention window parameter is located, and the threshold values of the first contention window parameter and the second contention window parameter are the same, or the second contention window parameter is any contention window parameter in a second contention window parameter interval which is larger than the first contention window parameter interval.
In the technical scheme, when a unicast wakeup message frame sent by the access point device by using a first contention window parameter contention channel resource at a first time point fails to be received, the unicast wakeup message frame sent by the access point device by using a second contention window parameter contention channel resource is received at a second time point, and when the unicast wakeup message frame is successfully received, a response frame is successfully fed back to the access point device after the unicast wakeup message frame is received, and a main communication interface of the access point device can be awakened according to the successfully received unicast wakeup message frame to receive downlink data cached by the access point device, so that the power consumption of the device is effectively reduced, the device is more power-saving, and the requirement of IEEE802.11ba is met.
Wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, the power consumption of the equipment is also saved; considering that the access device still cannot successfully send the unicast wakeup message frame when taking values in the first contention window parameter interval, the access device can take values in a second contention window parameter interval larger than the first contention window parameter interval to perform retransmission, and further, the access device can limit the number of times of retransmission in each contention window parameter interval, so that the retransmission time of the unicast wakeup message frame can be effectively saved, the retransmission efficiency is improved, and the power consumption of the device is further reduced, so that the device saves more power.
Further, the interval duration between the second time point when the access point device retransmits the unicast wakeup message frame and the previous first time point should be at least the timeout duration when the waiting station device performs feedback response for the unicast wakeup message frame, and further, the timeout duration refers to the sum of the duration when the unicast wakeup message frame is processed inside the device, the duration when the secondary communication interface of the station device is switched to the primary communication interface of the station device, and the duration when the station device contends for an access channel, so that the accuracy of the result of determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, thereby avoiding unnecessary device power consumption, enabling the device to be more power-saving, and meeting the requirement of IEEE802.11 ba.
According to the fourth aspect of the present invention, there is further provided a communication apparatus of a wireless local area network, for a station device, the communication apparatus of the wireless local area network including: a receiving module, configured to receive a unicast wakeup message frame retransmitted by an access point device at a second time point after a failure of sending the unicast wakeup message frame by using a first contention window parameter contention channel resource at the first time point by using the access point device; and an awakening module configured to awaken a primary communication interface of the station device according to the unicast awakening message frame, which is received by the receiving module and retransmitted by the access point device, where the second contention window parameter is any contention window parameter in a first contention window parameter interval in which the first contention window parameter is located, and thresholds of the first contention window parameter and the second contention window parameter are the same, or the second contention window parameter is any contention window parameter in a second contention window parameter interval larger than the first contention window parameter interval.
In the technical scheme, when a unicast wakeup message frame sent by the access point device by using a first contention window parameter contention channel resource at a first time point fails to be received, the unicast wakeup message frame sent by the access point device by using a second contention window parameter contention channel resource is received at a second time point, and when the unicast wakeup message frame is successfully received, a response frame is successfully fed back to the access point device after the unicast wakeup message frame is received, and a main communication interface of the access point device can be awakened according to the successfully received unicast wakeup message frame to receive downlink data cached by the access point device, so that the power consumption of the device is effectively reduced, the device is more power-saving, and the requirement of IEEE802.11ba is met.
Wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, the power consumption of the equipment is also saved; considering that the access device still cannot successfully send the unicast wakeup message frame when taking values in the first contention window parameter interval, the access device can take values in a second contention window parameter interval larger than the first contention window parameter interval to perform retransmission, and further, the access device can limit the number of times of retransmission in each contention window parameter interval, so that the retransmission time of the unicast wakeup message frame can be effectively saved, the retransmission efficiency is improved, and the power consumption of the device is further reduced, so that the device saves more power.
Further, the interval duration between the second time point when the access point device retransmits the unicast wakeup message frame and the previous first time point should be at least the timeout duration when the waiting station device performs feedback response for the unicast wakeup message frame, and further, the timeout duration refers to the sum of the duration when the unicast wakeup message frame is processed inside the device, the duration when the secondary communication interface of the station device is switched to the primary communication interface of the station device, and the duration when the station device contends for an access channel, so that the accuracy of the result of determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, thereby avoiding unnecessary device power consumption, enabling the device to be more power-saving, and meeting the requirement of IEEE802.11 ba.
According to a fifth aspect of the present invention, there is also provided a communication device, comprising: communication means of a wireless local area network as described in the second aspect above; and/or a communication device of a wireless local area network as described in the fourth aspect above.
Through the technical scheme of the invention, when the access point equipment retransmits the unicast awakening message frame to the station equipment, the power consumption of the equipment can be effectively reduced by adopting a random backoff CW mechanism, so that the equipment is more power-saving, and the requirements of IEEE802.11ba are met.
Drawings
Fig. 1 is a flowchart illustrating a communication method for a wireless local area network of an access point device according to a first embodiment of the present invention;
fig. 2 is a flowchart illustrating a communication method for a wireless local area network of an access point device according to a second embodiment of the present invention;
fig. 3 shows a schematic block diagram of a communication apparatus of a wireless local area network for an access point device according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a communication method for a wireless local area network of a station device according to an embodiment of the present invention;
fig. 5 shows a schematic block diagram of a communication apparatus of a wireless local area network for a station device according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 is a flowchart illustrating a communication method for a wireless local area network of an access point device according to a first embodiment of the present invention.
As shown in fig. 1, a communication method for a wireless local area network of an access point device according to a first embodiment of the present invention specifically includes the following steps:
In this embodiment, when the access point device determines that the unicast wakeup message frame sent to the station device by the access point device fails to be sent, that is, when the corresponding feedback of the station device is not received within a certain time period after the unicast wakeup message frame is sent to the station device by using the first contention window parameter contention channel resource at the first time point, the unicast wakeup message frame may be sent to the station device again by using the second contention window parameter contention channel resource at the second time point, so that the secondary communication interface of the station device wakes up the primary communication interface thereof to receive the downlink data cached by the access point device for the secondary communication interface when the unicast wakeup message frame is successfully received, thereby effectively reducing the power consumption of the device, enabling the device to be more power-saving, and meeting the requirements of IEEE802.11 ba; wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, device power consumption is also saved.
As shown in fig. 2, the communication method for the wireless local area network of the access point device according to the second embodiment of the present invention includes steps 202 to 204, which are substantially the same as the contents of steps 102 to 104 shown in fig. 1, and further includes the following steps:
and step 206, counting the transmission times of the retransmission of the unicast wakeup message frame.
And step 208, determining whether to continue retransmitting the unicast wakeup message frame to the site equipment according to the comparison result of the transmission times and a preset threshold.
In this embodiment, in order to further reduce the power consumption of the device and make the device more power-saving, the number of times of retransmitting the unicast wakeup message frame to the station device within the same contention window parameter interval may be limited, specifically, after the first retransmission is started, the number of times of retransmitting the unicast wakeup message frame may be counted, that is, the number of times of transmission counted in sequence is updated every time of retransmission, and then compared with a preset threshold (for example, 3 times, where a specific value is determined according to actual circumstances) to determine whether to continue to retransmit the unicast wakeup message frame according to the comparison result, if the preset threshold is not exceeded, the retransmission of the unicast wakeup message frame may be continued, otherwise, the retransmission of the unicast wakeup message frame to the station device may be stopped, and meanwhile, a method of increasing the threshold of the CW parameter may also be used to perform retransmission, for example, the threshold of the number of retransmission of a certain wakeup message frame is 3, if the transmission is not successful under the condition of adopting the threshold value of the same CW parameter, the existing Back-off mechanism can be adopted to increase the threshold value of the CW parameter for retransmission.
Further, in any of the above embodiments, the communication method of the wireless local area network further includes: after the retransmission of the unicast wakeup message frame by using the second contention window parameter contention access channel fails, the first contention window parameter interval is increased to be a second contention window parameter interval, so that the unicast wakeup message frame is retransmitted by using any contention window parameter contention channel resource in the second contention window parameter interval.
In this embodiment, when the retransmission of the unicast wakeup message frame by taking the second contention window parameter from the first contention window parameter interval is unsuccessful, the first contention window interval may be set as the second contention window parameter interval, and any contention window parameter contention channel resource in the second contention window parameter interval is continuously taken to retransmit the unicast wakeup message frame, so as to improve the probability of retransmitting the unicast wakeup message frame to the station device; for example, the first contention window parameter interval may be [1, 10], and the second contention window parameter interval may be [1, 15 ].
Further, the transmission times of the retransmitted unicast wakeup message frame counted in the first contention window parameter interval can be reset to zero, and the retransmission is performed by using the contention window parameter in the second contention window parameter interval, so as to perform comparison according to a preset threshold, and determine whether to continue retransmitting the unicast wakeup message frame to the station device according to the comparison result.
Further, in any of the above embodiments, a duration of an interval between the second time point and the first time point is a timeout duration for the access point device to wait for the station device to feed back the unicast wakeup message frame.
In this embodiment, an interval duration between the second time point and the previous first time point of retransmitting the unicast wakeup message frame to the site device should be at least a timeout duration of waiting for the site device to perform feedback response for the unicast wakeup message frame, and further, the timeout duration refers to a sum of a duration of processing the unicast wakeup message frame inside the device, a duration of switching from the secondary communication interface of the site device to the primary communication interface thereof, and a duration of competing for an access channel, so that accuracy of a result of determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, unnecessary device power consumption is avoided, the device is more power-saving, and requirements of IEEE802.11ba are met.
The executing subject of the communication method shown in fig. 1 and fig. 2 may be an access point device in a network formed by the access point device and the station device, such as a router, a server with a Wi-Fi interface, or a smartphone.
Fig. 3 shows a schematic block diagram of a communication apparatus of a wireless local area network for an access point device according to an embodiment of the present invention.
As shown in fig. 3, the communication apparatus 30 for a wireless local area network of an access point device according to an embodiment of the present invention includes a sending module 302, and the sending module 302 is configured to:
sending a unicast awakening message frame to station equipment by adopting a first competition window parameter competition channel resource at a first time point; and when the feedback of the station equipment for the unicast wakeup message frame is not received, retransmitting the unicast wakeup message frame to the station equipment by adopting a second contention window parameter contention channel resource at a second moment, wherein the first contention window parameter and the second contention window parameter are any contention window parameter in a first contention window parameter interval, and the threshold values of the first contention window parameter and the second contention window parameter are the same.
In this embodiment, when the access point device determines that the unicast wakeup message frame sent to the station device by the access point device fails to be sent, that is, when the corresponding feedback of the station device is not received within a certain time period after the unicast wakeup message frame is sent to the station device by using the first contention window parameter contention channel resource at the first time point, the unicast wakeup message frame may be sent to the station device again by using the second contention window parameter contention channel resource at the second time point, so that the secondary communication interface of the station device wakes up the primary communication interface thereof to receive the downlink data cached by the access point device for the secondary communication interface when the unicast wakeup message frame is successfully received, thereby effectively reducing the power consumption of the device, enabling the device to be more power-saving, and meeting the requirements of IEEE802.11 ba; wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, device power consumption is also saved.
Further, in the above embodiment, the communication device of the wireless local area network further includes: a statistics module 304 and a determination module 306.
The counting module 304 is configured to count the number of times of transmitting the unicast wakeup message frame for retransmission after the sending module 302 uses the second contention window parameter contention channel resource to resend the unicast wakeup message frame to the station device; the determining module 306 is configured to determine whether to continue retransmitting the unicast wakeup message frame to the station device according to a comparison result between the transmission times counted by the counting module 304 and a preset threshold.
In this embodiment, in order to further reduce the power consumption of the device and make the device more power-saving, the number of times of retransmitting the unicast wakeup message frame to the station device within the same contention window parameter interval may be limited, specifically, after the first retransmission is started, the number of times of retransmitting the unicast wakeup message frame may be counted, that is, the number of times of transmission counted in sequence is updated every time of retransmission, and then compared with a preset threshold (for example, 3 times, where a specific value is determined according to actual circumstances) to determine whether to continue to retransmit the unicast wakeup message frame according to the comparison result, if the preset threshold is not exceeded, the retransmission of the unicast wakeup message frame may be continued, otherwise, the retransmission of the unicast wakeup message frame to the station device may be stopped, and meanwhile, a method of increasing the threshold of the CW parameter may also be used to perform retransmission, for example, the threshold of the number of retransmission of a certain wakeup message frame is 3, if the transmission is not successful under the condition of adopting the threshold value of the same CW parameter, the existing Back-off mechanism can be adopted to increase the threshold value of the CW parameter for retransmission.
Further, in any of the above embodiments, the communication device of the wireless local area network further includes: a processing module 308, configured to increase the first contention window parameter interval to a second contention window parameter interval after the retransmission of the unicast wakeup message frame by using the second contention window parameter contention access channel fails, so as to retransmit the unicast wakeup message frame by using any contention window parameter contention channel resource in the second contention window parameter interval.
In this embodiment, when the retransmission of the unicast wakeup message frame by taking the second contention window parameter from the first contention window parameter interval is unsuccessful, the first contention window interval may be set as the second contention window parameter interval, and any contention window parameter contention channel resource in the second contention window parameter interval is continuously taken to retransmit the unicast wakeup message frame, so as to improve the probability of retransmitting the unicast wakeup message frame to the station device; for example, the first contention window parameter interval may be [1, 10], and the second contention window parameter interval may be [1, 15 ].
Further, the transmission times of the retransmitted unicast wakeup message frame counted in the first contention window parameter interval can be reset to zero, and the retransmission is performed by using the contention window parameter in the second contention window parameter interval, so as to perform comparison according to a preset threshold, and determine whether to continue retransmitting the unicast wakeup message frame to the station device according to the comparison result.
Further, in any of the above embodiments, a duration of an interval between the second time point and the first time point is a timeout duration for the access point device to wait for the station device to feed back the unicast wakeup message frame.
In this embodiment, an interval duration between the second time point and the previous first time point of retransmitting the unicast wakeup message frame to the site device should be at least a timeout duration of waiting for the site device to perform feedback response for the unicast wakeup message frame, and further, the timeout duration refers to a sum of a duration of processing the unicast wakeup message frame inside the device, a duration of switching from the secondary communication interface of the site device to the primary communication interface thereof, and a duration of competing for an access channel, so that accuracy of a result of determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, unnecessary device power consumption is avoided, the device is more power-saving, and requirements of IEEE802.11ba are met.
In a specific implementation, the statistical module 304, the determining module 306, and the processing module 308 may be a central processor or a baseband processor, etc.; the sending module 302 may be a transmitter or an antenna, etc.
Fig. 4 is a flowchart illustrating a communication method for a wireless local area network of a station device according to an embodiment of the present invention.
As shown in fig. 4, the communication method for the wireless lan of the station device according to the embodiment of the present invention specifically includes the following steps:
The second contention window parameter is any contention window parameter within a first contention window parameter interval in which the first contention window parameter is located, and the threshold values of the first contention window parameter and the second contention window parameter are the same, or the second contention window parameter is any contention window parameter within a second contention window parameter interval larger than the first contention window parameter interval.
In this embodiment, when receiving a unicast wakeup message frame sent by an access point device by using a first contention window parameter contention channel resource at a first time point fails, receiving the unicast wakeup message frame sent by the access point device by using a second contention window parameter contention channel resource at a second time point, and when the reception is successful, that is, after receiving the unicast wakeup message frame, successfully feeding back a response frame to the access point device, and waking up a main communication interface of the access point device according to the successfully received unicast wakeup message frame to receive downlink data cached by the access point device, thereby effectively reducing the power consumption of the device, enabling the device to save more power, and meeting the requirements of IEEE802.11 ba.
Wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, the power consumption of the equipment is also saved; considering that the access device still cannot successfully send the unicast wakeup message frame when taking values in the first contention window parameter interval, the access device may take values in a second contention window parameter interval larger than the first contention window parameter interval to perform retransmission, for example, the first contention window parameter interval may be [1, 10], and the second contention window parameter interval may be [1, 15], and further, the access point device may limit the number of times of transmission for retransmission in each contention window parameter interval, so that the retransmission time of the unicast wakeup message frame may be effectively saved, the retransmission efficiency is improved, and thus, the power consumption of the device is further reduced, and the device is more power-saving.
Further, in the above embodiment, an interval duration between the second time point and the previous first time point at which the access point device retransmits the unicast wakeup message frame should be at least a timeout duration for the station waiting device to perform feedback response on the unicast wakeup message frame, and further, the timeout duration refers to a sum of a duration for processing the unicast wakeup message frame inside the device, a duration for switching from the secondary communication interface of the station device to the primary communication interface of the station waiting device, and a duration for contending for an access channel, so that accuracy of a result for determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, thereby avoiding unnecessary device power consumption, enabling the device to be more power-saving, and meeting requirements of IEEE802.11 ba.
The main body of the communication method shown in fig. 4 may be a station device in a network formed by an access point and a station, such as a smart phone or a PDA (Personal Digital Assistant).
The interface through which the station device receives the wakeup message frame is a secondary communication interface, and the purpose of receiving the wakeup message frame is to wake up a primary communication interface of the station device to perform communication so as to obtain a downlink data frame buffered by the access point device.
Fig. 5 shows a schematic block diagram of a communication apparatus of a wireless local area network for a station device according to an embodiment of the present invention.
As shown in fig. 5, a communication apparatus 50 for a wireless local area network of a station device according to an embodiment of the present invention specifically includes: a receiving module 502 and a wake-up module 504.
The receiving module 502 is configured to receive a unicast wakeup message frame retransmitted by an access point device at a second time point after a unicast wakeup message frame sent by an access point device at a first time point by using a first contention window parameter contention channel resource fails to be sent; the wake-up module 504 is configured to wake up a main communication interface of the station device according to the unicast wake-up message frame, which is received by the receiving module 502 and retransmitted by the access point device, where the second contention window parameter is any contention window parameter in a first contention window parameter interval in which the first contention window parameter is located, and thresholds of the first contention window parameter and the second contention window parameter are the same, or the second contention window parameter is any contention window parameter in a second contention window parameter interval larger than the first contention window parameter interval.
In this embodiment, when receiving a unicast wakeup message frame sent by an access point device by using a first contention window parameter contention channel resource at a first time point fails, receiving the unicast wakeup message frame sent by the access point device by using a second contention window parameter contention channel resource at a second time point, and when the reception is successful, that is, after receiving the unicast wakeup message frame, successfully feeding back a response frame to the access point device, and waking up a main communication interface of the access point device according to the successfully received unicast wakeup message frame to receive downlink data cached by the access point device, thereby effectively reducing the power consumption of the device, enabling the device to save more power, and meeting the requirements of IEEE802.11 ba.
Wherein, the second contention window parameter may be any contention window parameter in the first contention window parameter interval in which the first contention window parameter is located, further, the two contention window parameters may be the same threshold, for example, the threshold of the CW parameter used at the first time point is 10, then the CW parameter used at the first time point is any randomly selected number from 1 to 10, for example, the CW parameter thereof is 3, and the threshold of the same CW parameter used at the second time point is also 10, then the CW parameter used at the second time point is any randomly selected number from 1 to 10, for example, 4, and the same CW parameter may be randomly selected twice, so that the threshold of the CW parameter at each time point is not increased, the retransmission time of the unicast wakeup message frame and the waiting time of the receiving side may be effectively saved, and the retransmission efficiency is improved, the power consumption of the equipment is also saved; considering that the access device still cannot successfully send the unicast wakeup message frame when taking values in the first contention window parameter interval, the access device may take values in a second contention window parameter interval larger than the first contention window parameter interval to perform retransmission, for example, the first contention window parameter interval may be [1, 10], and the second contention window parameter interval may be [1, 15], and further, the access point device may limit the number of times of transmission for retransmission in each contention window parameter interval, so that the retransmission time of the unicast wakeup message frame may be effectively saved, the retransmission efficiency is improved, and thus, the power consumption of the device is further reduced, and the device is more power-saving.
Further, in the above embodiment, an interval duration between the second time point and the previous first time point at which the access point device retransmits the unicast wakeup message frame should be at least a timeout duration for the station waiting device to perform feedback response on the unicast wakeup message frame, and further, the timeout duration refers to a sum of a duration for processing the unicast wakeup message frame inside the device, a duration for switching from the secondary communication interface of the station device to the primary communication interface of the station waiting device, and a duration for contending for an access channel, so that accuracy of a result for determining whether the unicast wakeup message frame needs to be retransmitted can be ensured, thereby avoiding unnecessary device power consumption, enabling the device to be more power-saving, and meeting requirements of IEEE802.11 ba.
In a specific implementation, the receiving module 502 may be a receiver or an antenna, etc.; the wake-up module 504 may be a central processor or a baseband processor, etc.
There is also provided, in accordance with an embodiment of the present invention, communication apparatus including: a communication device 30 of a wireless local area network as shown in fig. 3; and/or a communication device 50 of a wireless local area network as shown in fig. 5.
The technical scheme of the present invention is described in detail above with reference to the accompanying drawings, and according to the technical scheme of the present invention, when the access point device retransmits a unicast wakeup message frame to the station device, a random backoff CW mechanism is adopted, so that the power consumption of the device can be effectively reduced, the device is more power-saving, and the requirements of IEEE802.11ba are met.
In the description of the present specification, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and specific meanings of the above terms in the disclosed embodiments may be understood according to specific situations by those of ordinary skill in the art.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A communication method of a wireless local area network, which is used for an access point device, wherein the communication method of the wireless local area network comprises:
sending a unicast awakening message frame to station equipment by adopting a first competition window parameter competition channel resource at a first time point;
when the feedback of the station equipment for the unicast awakening message frame is not received, a second contention window parameter contention channel resource is adopted to resend the unicast awakening message frame to the station equipment at a second moment,
the first contention window parameter and the second contention window parameter are both any contention window parameter within a first contention window parameter interval, and the threshold values of the first contention window parameter and the second contention window parameter are the same.
2. The communication method of the wireless local area network according to claim 1, further comprising, after retransmitting the unicast wakeup message frame to the station device by using the second contention window parameter for the channel resource, the step of:
counting the transmission times of retransmitting the unicast awakening message frame;
and determining whether to continuously retransmit the unicast wakeup message frame to the site equipment according to the comparison result of the transmission times and a preset threshold value.
3. The communication method of the wireless local area network according to claim 1 or 2, further comprising:
after the retransmission of the unicast wakeup message frame by using the second contention window parameter contention access channel fails, the first contention window parameter interval is increased to be a second contention window parameter interval, so that the unicast wakeup message frame is retransmitted by using any contention window parameter contention channel resource in the second contention window parameter interval.
4. The communication method of the wireless local area network according to claim 1 or 2, wherein a duration of an interval between the second time point and the first time point is a timeout duration for the access point device to wait for the station device to feed back the unicast wakeup message frame.
5. A communication method of a wireless local area network, which is used for a station device, and is characterized in that the communication method of the wireless local area network comprises:
receiving a unicast awakening message frame retransmitted by access point equipment at a second time point by adopting a second competition window parameter competition access channel after the access point equipment fails to adopt a first competition window parameter competition channel resource to send the unicast awakening message frame;
awakening a main communication interface of the station equipment according to the unicast awakening message frame retransmitted by the access point equipment,
the second contention window parameter is any contention window parameter within a first contention window parameter interval in which the first contention window parameter is located, and the threshold values of the first contention window parameter and the second contention window parameter are the same, or the second contention window parameter is any contention window parameter within a second contention window parameter interval larger than the first contention window parameter interval.
6. A communication apparatus of a wireless local area network, configured to be used in an access point device, wherein the communication apparatus of the wireless local area network includes a sending module, and the sending module is configured to:
sending a unicast awakening message frame to station equipment by adopting a first competition window parameter competition channel resource at a first time point;
when the feedback of the station equipment for the unicast awakening message frame is not received, a second contention window parameter contention channel resource is adopted to resend the unicast awakening message frame to the station equipment at a second moment,
the first contention window parameter and the second contention window parameter are both any contention window parameter within a first contention window parameter interval, and the threshold values of the first contention window parameter and the second contention window parameter are the same.
7. The apparatus for communicating in a wireless local area network according to claim 6, further comprising:
a counting module, configured to count the number of times of transmission for retransmitting the unicast wakeup message frame after the sending module retransmits the unicast wakeup message frame to the site device by using the second contention window parameter contention channel resource;
and the determining module is used for determining whether to continuously retransmit the unicast awakening message frame to the site equipment according to the comparison result of the transmission times counted by the counting module and a preset threshold value.
8. The apparatus for communicating in a wireless local area network according to claim 6 or 7, further comprising:
and the processing module is used for increasing the first contention window parameter interval to a second contention window parameter interval after the retransmission of the unicast wakeup message frame by using the second contention window parameter contention access channel fails, so as to retransmit the unicast wakeup message frame by using any contention window parameter contention channel resource in the second contention window parameter interval.
9. The apparatus according to claim 6 or 7, wherein a duration of an interval between the second time point and the first time point is a timeout duration for the access point device to wait for the station device to feed back the unicast wakeup message frame.
10. A communication apparatus of a wireless local area network, for a station device, the communication apparatus of the wireless local area network comprising:
a receiving module, configured to receive a unicast wakeup message frame retransmitted by an access point device at a second time point by using a second contention window parameter contention access channel after the access point device fails to send the unicast wakeup message frame by using a first contention window parameter contention channel resource at the first time point;
a wake-up module, configured to wake up a primary communication interface of the station device according to the unicast wake-up message frame re-sent by the access point device and received by the receiving module,
the second contention window parameter is any contention window parameter within a first contention window parameter interval in which the first contention window parameter is located, and the threshold values of the first contention window parameter and the second contention window parameter are the same, or the second contention window parameter is any contention window parameter within a second contention window parameter interval larger than the first contention window parameter interval.
11. A communication device, comprising: communication device of a wireless local area network according to any of claims 6 to 10.
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| WO2016179837A1 (en) * | 2015-05-14 | 2016-11-17 | 华为技术有限公司 | Apparatus and method for adjusting contention window, network device, terminal and network system |
| CN106817775A (en) * | 2015-11-27 | 2017-06-09 | 华为技术有限公司 | Distributed OFDMA accidental access methods, AP and STA |
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| WO2012141758A1 (en) * | 2011-04-15 | 2012-10-18 | Intel Corporation | Methods and arrangements for channel access in wireless networks |
| US9749955B2 (en) * | 2015-07-20 | 2017-08-29 | Intel Corporation | Connectivity management for mobile wireless low-power wake-up radios |
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| WO2016179837A1 (en) * | 2015-05-14 | 2016-11-17 | 华为技术有限公司 | Apparatus and method for adjusting contention window, network device, terminal and network system |
| CN106817775A (en) * | 2015-11-27 | 2017-06-09 | 华为技术有限公司 | Distributed OFDMA accidental access methods, AP and STA |
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