CN107580303B - Communication method, communication device, access point and station of wireless local area network - Google Patents
Communication method, communication device, access point and station of wireless local area network Download PDFInfo
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- CN107580303B CN107580303B CN201610523656.0A CN201610523656A CN107580303B CN 107580303 B CN107580303 B CN 107580303B CN 201610523656 A CN201610523656 A CN 201610523656A CN 107580303 B CN107580303 B CN 107580303B
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Abstract
The invention provides a communication method, a communication device, an access point and a station of a wireless local area network, wherein the communication method of the wireless local area network comprises the following steps: generating a communication resource allocation message frame, wherein the communication resource allocation message frame comprises a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point; and transmitting the communication resource allocation message frame. The invention ensures that the minimum value of the OFDMA competition window indicated by the access point is gradually reduced along with the sending times of the communication resource allocation message frame for a group of specific stations, avoids the waste of resources caused by the fact that the minimum value of the OFDMA competition window is not changed all the time but the number of the stations needing to allocate resources is less, and is beneficial to improving the throughput of the system.
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 a wireless local area network, an access point, and a station.
Background
In 5 months in 2013, 802.11 has established a research group HEW (High efficiency W L AN) of the next generation Wi-Fi (Wireless Fidelity ) technology, i.e. 802.11ax, and the main research points are to improve the throughput of the existing Wi-Fi technology, improve the effective utilization efficiency of the frequency spectrum, improve the user experience and the quality of service qoe (quality of experience), and realize a more intensive communication environment than the existing Wi-Fi technology.
OFDMA (Orthogonal Frequency Division multiple access) technology will be adopted in 802.11ax, and in order to allocate resources to each STA (Station), a new resource allocation message frame, called a trigger frame, is defined in 802.11 ax. One way for the trigger frame to allocate resources to the stations is that the initialized stations receive the trigger frame and then randomly access a channel by using an OFDMA technique, specifically, the stations maintain random numbers, and further randomly select a radio resource block for uplink communication.
Currently, the selection of the random number in the standard mainly provides for selecting a number between 0 and the minimum value of the OCW (OFDMA ContentionWindow). However, no relevant provisions are made for the change in the minimum value of the OCW. For a specific group of STAs, if the minimum value of the OCW is not changed all the time, that is, the AP always allocates resources to the group of STAs, there is a possibility that resources are wasted because the station has no uplink data to transmit.
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, so that for a specific group of stations, the minimum value of the OFDMA contention window indicated by the access point will gradually decrease along with the number of times of sending the communication resource allocation message frame, thereby avoiding the waste of resources caused by the fact that the minimum value of the OFDMA contention window is not changed all the time but the number of stations needing to allocate resources is small, and facilitating the improvement of the throughput of the system.
In view of the above, according to a first aspect of the present invention, a communication method of a wireless local area network is provided, including: generating a communication resource allocation message frame, wherein the communication resource allocation message frame comprises a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point; and transmitting the communication resource allocation message frame.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
In addition, considering that there may be initialization STAs which have started OFDMA contention access at the first time point, but these STAs do not obtain uplink resources due to their count not reaching zero in the period of the first OFDMA contention access, which requires to obtain uplink resources in the contention period of the second OFDMA, the minimum value of the OFDMA contention window of the second contention period should be larger than the number of resource blocks allocated in the contention period of the second time, which may be the same as the number of resource blocks allocated in the contention period of the second time. The minimum value of the OFDMA contention window is used for selecting a random number from 0 to the minimum value when the station executes an OFDMA Back-off mechanism, and the uplink transmission resource is randomly selected according to the selected random number. Specifically, the station selects a random number from 0 to the minimum value of the OFDMA contention window, and then decreases in each RU (Resource Unit, Resource block) interval allocated by the access point according to the random number, and when the decrease is 0, randomly selects an idle Resource block to perform uplink transmission. Wherein each RU is spaced by X μ s, such as X ═ 5.
In addition, after all stations in a group of stations acquire transmission resources, if the access point needs to allocate transmission resources again, the access point needs to adopt the minimum value of the larger OFDMA contention window again, and gradually reduce the minimum value of the OFDMA contention window in a communication resource allocation message frame to be subsequently sent according to the above process.
In the foregoing technical solution, preferably, if the communication resource allocation message frame is a broadcast message frame, minimum values of OFDMA contention windows in the communication resource allocation message frame generated at any time point are all equal.
In this technical solution, since the communication resource allocation message frame in the broadcast form is for all stations, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated by the access point at any time point may not change, so as to ensure that a station that needs to send data can acquire the transmission resource.
In any of the above technical solutions, preferably, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
In this technical solution, since the multicast-type communication resource allocation message frame allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources will decrease after the transmission resources are allocated to the stations at the first time point, that is, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
According to the second aspect of the present invention, there is also provided a communication method for a wireless local area network, including: receiving a first communication resource allocation message frame in a multicast form at a first time point, wherein the first communication resource allocation message frame comprises a first minimum value of an OFDMA contention window; selecting a random number for an OFDMA Back-off mechanism between 0 and the first minimum value, and randomly selecting uplink transmission resources from the resources indicated by the access point according to the selected random number; if the uplink transmission resource is not selected, receiving a second communication resource allocation message frame in a multicast form at a second time point, wherein the second communication resource allocation message frame contains a second minimum value of the OFDMA contention window, and the second minimum value is smaller than the first minimum value; and selecting a random number again from 0 to the second minimum value, and randomly selecting the uplink transmission resource based on the selected random number again.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
After selecting a random number from 0 to the minimum value of the OFDMA competition window, the station decrements in each RU interval allocated by the access point according to the random number, and randomly selects an idle resource block for uplink transmission when the decrement is 0. Wherein each RU is spaced by X μ s, such as X ═ 5.
According to the third aspect of the present invention, there is further provided a communication apparatus for a wireless local area network, including: a generating unit, configured to generate a communication resource allocation message frame, where the communication resource allocation message frame includes a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point; a sending unit, configured to send the communication resource allocation message frame.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
In addition, considering that there may be initialization STAs which have started OFDMA contention access at the first time point, but these STAs do not obtain uplink resources due to their count not reaching zero in the period of the first OFDMA contention access, which requires to obtain uplink resources in the contention period of the second OFDMA, the minimum value of the OFDMA contention window of the second contention period should be larger than the number of resource blocks allocated in the contention period of the second time, which may be the same as the number of resource blocks allocated in the contention period of the second time.
The minimum value of the OFDMA contention window is used for selecting a random number from 0 to the minimum value when the station executes an OFDMA Back-off mechanism, and the uplink transmission resource is randomly selected according to the selected random number. Specifically, the station selects a random number from 0 to the minimum value of the OFDMA contention window, and then decrements in each RU interval allocated by the access point according to the random number, and when the decremental value is 0, randomly selects an idle resource block for uplink transmission. Wherein each RU is spaced by X μ s, such as X ═ 5.
In addition, after all stations in a group of stations acquire transmission resources, if the access point needs to allocate transmission resources again, the access point needs to adopt the minimum value of the larger OFDMA contention window again, and gradually reduce the minimum value of the OFDMA contention window in a communication resource allocation message frame to be subsequently sent according to the above process.
In the foregoing technical solution, preferably, if the communication resource allocation message frame is a broadcast message frame, minimum values of OFDMA contention windows in the communication resource allocation message frame generated at any time point are all equal.
In this technical solution, since the communication resource allocation message frame in the broadcast form is for all stations, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated by the access point at any time point may not change, so as to ensure that a station that needs to send data can acquire the transmission resource.
In any of the above technical solutions, preferably, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
In this technical solution, since the multicast-type communication resource allocation message frame allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources will decrease after the transmission resources are allocated to the stations at the first time point, that is, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
According to the fourth aspect of the present invention, there is also provided a communication apparatus for a wireless local area network, including: a first receiving unit, configured to receive a first communication resource allocation message frame in a multicast format at a first time point, where the first communication resource allocation message frame includes a first minimum value of an OFDMA contention window; a first selecting unit, configured to select a random number for performing an OFDMA Back-off mechanism between 0 and the first minimum value, and randomly select an uplink transmission resource from resources indicated by the access point according to the selected random number; a second receiving unit, configured to receive a second communication resource allocation message frame in a multicast format at a second time point when the uplink transmission resource is not selected by the first selecting unit, where the second communication resource allocation message frame includes a second minimum value of the OFDMA contention window, and the second minimum value is smaller than the first minimum value; and a second selecting unit, configured to select the random number again between 0 and the second minimum value, and randomly select the uplink transmission resource based on the selected random number again.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
After selecting a random number from 0 to the minimum value of the OFDMA competition window, the station decrements in each RU interval allocated by the access point according to the random number, and randomly selects an idle resource block for uplink transmission when the decrement is 0. Wherein each RU is spaced by X μ s, such as X ═ 5.
According to the fifth aspect of the present invention, there is also provided an access point, comprising: the communication device of the wireless local area network according to the third aspect.
According to a sixth aspect of the present invention, there is also provided a station, comprising: a communication apparatus of a wireless local area network as described in the fourth aspect above.
Through the technical scheme, for a specific group of stations, the minimum value of the OFDMA contention window indicated by the access point is gradually reduced along with the sending times of the communication resource allocation message frame, so that the waste of resources caused by the fact that the minimum value of the OFDMA contention window is unchanged all the time but the number of the stations needing to allocate the resources is small is avoided, the communication requirement of 802.11ax is met, and the improvement of the throughput of the system is facilitated.
Drawings
Fig. 1 shows a schematic flow chart of a communication method of a wireless local area network according to a first embodiment of the present invention;
fig. 2 shows a schematic block diagram of a communication device of a wireless local area network according to a first embodiment of the present invention;
fig. 3 shows a schematic block diagram of an access point according to an embodiment of the invention;
fig. 4 shows a schematic flow chart of a communication method of a wireless local area network according to a second embodiment of the present invention;
fig. 5 shows a schematic block diagram of a communication device of a wireless local area network according to a second embodiment of the present invention;
fig. 6 shows a schematic block diagram of a station according to an embodiment of the 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 shows a schematic flow chart of a communication method of a wireless local area network according to a first embodiment of the present invention.
As shown in fig. 1, a communication method of a wireless local area network according to a first embodiment of the present invention includes:
step S10, generating a communication resource allocation message frame, where the communication resource allocation message frame includes a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point.
Wherein the number of stations involved in the communication resource allocation message frame generated at the second point in time is less than the number of stations involved in the communication resource allocation message frame generated at the first point in time. Specifically, since the communication resource allocation message frame in the multicast format allocates transmission resources to a group of specific stations, the number of stations that do not acquire transmission resources becomes smaller after the transmission resources are allocated to the stations at the first time point, that is, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
Step S12, sending the communication resource allocation message frame.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
In addition, considering that there may be initialization STAs which have started OFDMA contention access at the first time point, but these STAs do not obtain uplink resources due to their count not reaching zero in the period of the first OFDMA contention access, which requires to obtain uplink resources in the contention period of the second OFDMA, the minimum value of the OFDMA contention window of the second contention period should be larger than the number of resource blocks allocated in the contention period of the second time, which may be the same as the number of resource blocks allocated in the contention period of the second time.
For example, if the number of resource blocks allocated by the AP in the second OFDMA contention period is 10, the minimum value of the OFDMA contention window in the second contention period should be greater than or equal to 10, for example, the minimum value of the OFDMA contention window in the second contention period may be 12.
The minimum value of the OFDMA contention window is used for selecting a random number from 0 to the minimum value when the station executes an OFDMA Back-off mechanism, and the uplink transmission resource is randomly selected according to the selected random number. Specifically, the station selects a random number from 0 to the minimum value of the OFDMA contention window, and then decrements in each RU interval allocated by the access point according to the random number, and when the decremental value is 0, randomly selects an idle resource block for uplink transmission. Wherein each RU is spaced by X μ s, such as X ═ 5.
In addition, after all stations in a group of stations acquire transmission resources, if the access point needs to allocate transmission resources again, the access point needs to adopt the minimum value of the larger OFDMA contention window again, and gradually reduce the minimum value of the OFDMA contention window in a communication resource allocation message frame to be subsequently sent according to the above process.
In an embodiment of the present invention, if the communication resource allocation message frame is a broadcast message frame, minimum values of OFDMA contention windows in the communication resource allocation message frame generated at any time point are all equal.
In this technical solution, since the communication resource allocation message frame in the broadcast form is for all stations, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated by the access point at any time point may not change, so as to ensure that a station that needs to send data can acquire the transmission resource.
Among them, the execution subject of the communication method shown in fig. 1 may be a router or the like.
Fig. 2 shows a schematic block diagram of a communication device of a wireless local area network according to a first embodiment of the present invention.
As shown in fig. 2, a communication apparatus 200 of a wireless local area network according to a first embodiment of the present invention includes: a generating unit 202 and a transmitting unit 204.
The generating unit 202 is configured to generate a communication resource allocation message frame, where the communication resource allocation message frame includes a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point; the sending unit 204 is configured to send the communication resource allocation message frame.
In a specific implementation, the generating unit 202 may be a signal processor, a central processing unit, a baseband processor, or the like; the transmitting unit 204 may be a transmitter or an antenna, etc.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
In addition, considering that there may be initialization STAs which have started OFDMA contention access at the first time point, but these STAs do not obtain uplink resources due to their count not reaching zero in the period of the first OFDMA contention access, which requires to obtain uplink resources in the contention period of the second OFDMA, the minimum value of the OFDMA contention window of the second contention period should be larger than the number of resource blocks allocated in the contention period of the second time, which may be the same as the number of resource blocks allocated in the contention period of the second time.
For example, if the number of resource blocks allocated by the AP in the second OFDMA contention period is 10, the minimum value of the OFDMA contention window in the second contention period should be greater than or equal to 10, for example, the minimum value of the OFDMA contention window in the second contention period may be 12.
The minimum value of the OFDMA contention window is used for selecting a random number from 0 to the minimum value when the station executes an OFDMA Back-off mechanism, and the uplink transmission resource is randomly selected according to the selected random number. Specifically, the station selects a random number from 0 to the minimum value of the OFDMA contention window, and then decrements in each RU interval allocated by the access point according to the random number, and when the decremental value is 0, randomly selects an idle resource block for uplink transmission. Wherein each RU is spaced by X μ s, such as X ═ 5.
In addition, after all stations in a group of stations acquire transmission resources, if the access point needs to allocate transmission resources again, the access point needs to adopt the minimum value of the larger OFDMA contention window again, and gradually reduce the minimum value of the OFDMA contention window in a communication resource allocation message frame to be subsequently sent according to the above process.
In the foregoing technical solution, preferably, if the communication resource allocation message frame is a broadcast message frame, minimum values of OFDMA contention windows in the communication resource allocation message frame generated at any time point are all equal.
In this technical solution, since the communication resource allocation message frame in the broadcast form is for all stations, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated by the access point at any time point may not change, so as to ensure that a station that needs to send data can acquire the transmission resource.
In any of the above technical solutions, preferably, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
In this technical solution, since the multicast-type communication resource allocation message frame allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources will decrease after the transmission resources are allocated to the stations at the first time point, that is, the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
Fig. 3 shows a schematic block diagram of an access point according to an embodiment of the invention.
As shown in fig. 3, an access point 300 according to an embodiment of the present invention includes: such as the communication device 200 of the wireless local area network shown in fig. 2.
Fig. 4 shows a schematic flow chart of a communication method of a wireless local area network according to a second embodiment of the present invention.
As shown in fig. 4, a communication method of a wireless local area network according to a second embodiment of the present invention includes:
step S40, receiving a first communication resource allocation message frame in a multicast format at a first time point, where the first communication resource allocation message frame includes a first minimum value of an OFDMA contention window.
Step S42, selecting a random number for OFDMA Back-off mechanism between 0 and the first minimum value, and randomly selecting uplink transmission resources from the resources indicated by the access point according to the selected random number.
Step S44, if the uplink transmission resource is not selected, receiving a second communication resource allocation message frame in a multicast format at a second time point, where the second communication resource allocation message frame includes a second minimum value of the OFDMA contention window, and the second minimum value is smaller than the first minimum value.
Step S46, re-selecting a random number from 0 to the second minimum value, and randomly selecting an uplink transmission resource based on the re-selected random number.
In the technical solution shown in fig. 4, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources becomes smaller after the access point allocates transmission resources to the stations at the first time point, so when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently can also be reduced after the access point has allocated transmission resources to a certain group of stations, thereby avoiding resource waste caused by the fact that the minimum value of the OFDMA contention window is not changed all the time but the number of stations that need to allocate resources is smaller, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
After selecting a random number from 0 to the minimum value of the OFDMA competition window, the station decrements in each RU interval allocated by the access point according to the random number, and randomly selects an idle resource block for uplink transmission when the decrement is 0. Wherein each RU is spaced by X μ s, such as X ═ 5.
The main body of the communication method shown in fig. 4 may be a mobile phone or a PDA (Personal digital assistant), etc.
Fig. 5 shows a schematic block diagram of a communication device of a wireless local area network according to a second embodiment of the present invention.
As shown in fig. 5, a communication apparatus 500 of a wireless lan according to a second embodiment of the present invention includes: a first receiving unit 502, a first selecting unit 504, a second receiving unit 506 and a second selecting unit 508.
The first receiving unit 502 is configured to receive a first communication resource allocation message frame in a multicast form at a first time point, where the first communication resource allocation message frame includes a first minimum value of an OFDMA contention window; a first selecting unit 504 is configured to select a random number for performing an OFDMA Back-off mechanism between 0 and the first minimum value, and randomly select an uplink transmission resource from the resources indicated by the access point according to the selected random number; a second receiving unit 506, configured to receive a second communication resource allocation message frame in a multicast form at a second time point when the uplink transmission resource is not selected by the first selecting unit 504, where the second communication resource allocation message frame includes a second minimum value of the OFDMA contention window, and the second minimum value is smaller than the first minimum value; the second selecting unit 508 is configured to select a random number again from 0 to the second minimum value, and randomly select an uplink transmission resource based on the selected random number again.
In a specific implementation, the first receiving unit 502 and the second receiving unit 506 may be receivers or antennas, etc.; the first selecting unit 504 and the second selecting unit 508 may be a central processor or a baseband processor, etc.
In the technical solution, since the communication resource allocation message frame in the multicast format allocates transmission resources to a specific group of stations, the number of stations that do not acquire transmission resources may decrease after the access point allocates transmission resources to the stations at the first time point, when the communication resource allocation message frame is a multicast message frame, by making the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the second time point smaller than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at the first time point, the minimum value of the OFDMA contention window indicated by the communication resource allocation message frame subsequently may also decrease after the access point has allocated transmission resources to a certain group of stations, thereby avoiding waste of resources due to the fact that the minimum value of the OFDMA contention window does not change all the time but the number of stations that need to allocate resources is small, the communication requirement of 802.11ax is met, and the throughput of the system is improved.
After selecting a random number from 0 to the minimum value of the OFDMA competition window, the station decrements in each RU interval allocated by the access point according to the random number, and randomly selects an idle resource block for uplink transmission when the decrement is 0. Wherein each RU is spaced by X μ s, such as X ═ 5.
Fig. 6 shows a schematic block diagram of a station according to an embodiment of the invention.
As shown in fig. 6, a station 600 according to an embodiment of the present invention includes: such as the communication device 500 of the wireless local area network shown in fig. 5.
In summary, the technical solution of the present invention mainly provides a change mechanism of the minimum value of the OCW for different types of trigger frames (i.e. communication resource allocation message frames), so as to be more suitable for the communication scenario of 802.11 ax. Specifically, the method comprises the following steps:
1. for a particular group of STAs, the trigger frame at this time is a multicast trigger frame.
When the AP transmits the trigger frame for the first time, the minimum value of the OCW may be the number of STAs involved in the destination address of the trigger frame, and when part of STAs acquire the uplink resource and the AP transmits the trigger frame for the second time, the number of STAs involved is less than the number of STAs involved for the first time, so the minimum value of the OCW indicated in the trigger frame should be less than the minimum value of the OCW for the first time. Such as: the number of STAs involved in the transmission of the trigger frame by the AP is 20, and 5 STAs do not acquire the resource at the end of the first OBO (OFDMA Back-off) period, so that the number of STAs involved in the transmission of the trigger frame for the second time is 10, and the minimum value of the OCW in the trigger frame for the second time can be set to 15, and so on until the group of stations acquire the transmission resource.
2. For all STAs, the trigger frame at this time is a broadcast trigger frame.
The minimum value of the OCW indicated by the AP is constantly unchanged every time the AP transmits a trigger frame.
The technical scheme of the present invention is described in detail above with reference to the accompanying drawings, and the present invention provides a new communication scheme of a wireless local area network, so that for a specific group of stations, the minimum value of the OFDMA contention window indicated by the access point is gradually reduced along with the number of times of sending the communication resource allocation message frame, thereby avoiding the waste of resources caused by the fact that the minimum value of the OFDMA contention window is not changed all the time but the number of stations needing to allocate resources is small, and being beneficial to improving the throughput of the system.
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 (8)
1. A communication method for a wireless local area network, comprising:
generating a communication resource allocation message frame, wherein the communication resource allocation message frame comprises a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point;
transmitting the communication resource allocation message frame;
and if the communication resource allocation message frame is a broadcast message frame, the minimum values of the OFDMA competition windows in the communication resource allocation message frame generated at any time point are all equal.
2. The method according to claim 1, wherein the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
3. A communication method for a wireless local area network, comprising:
receiving a first communication resource allocation message frame in a multicast form at a first time point, wherein the first communication resource allocation message frame comprises a first minimum value of an OFDMA contention window;
selecting a random number for an OFDMA Back-off mechanism between 0 and the first minimum value, and randomly selecting uplink transmission resources from the resources indicated by the access point according to the selected random number;
if the uplink transmission resource is not selected, receiving a second communication resource allocation message frame in a multicast form at a second time point, wherein the second communication resource allocation message frame contains a second minimum value of the OFDMA contention window, and the second minimum value is smaller than the first minimum value;
and selecting a random number again from 0 to the second minimum value, and randomly selecting the uplink transmission resource based on the selected random number again.
4. A communication apparatus of a wireless local area network, comprising:
a generating unit, configured to generate a communication resource allocation message frame, where the communication resource allocation message frame includes a minimum value of an OFDMA contention window, and if the communication resource allocation message frame is a multicast message frame, the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a first time point is greater than the minimum value of the OFDMA contention window in the communication resource allocation message frame generated at a second time point after the first time point;
a transmitting unit, configured to transmit the communication resource allocation message frame;
and if the communication resource allocation message frame is a broadcast message frame, the minimum values of the OFDMA competition windows in the communication resource allocation message frame generated at any time point are all equal.
5. The apparatus as claimed in claim 4, wherein the number of stations involved in the communication resource allocation message frame generated at the second time point is smaller than the number of stations involved in the communication resource allocation message frame generated at the first time point.
6. A communication apparatus of a wireless local area network, comprising:
a first receiving unit, configured to receive a first communication resource allocation message frame in a multicast format at a first time point, where the first communication resource allocation message frame includes a first minimum value of an OFDMA contention window;
a first selecting unit, configured to select a random number for performing an OFDMA Back-off mechanism between 0 and the first minimum value, and randomly select an uplink transmission resource from resources indicated by the access point according to the selected random number;
a second receiving unit, configured to receive a second communication resource allocation message frame in a multicast format at a second time point when the uplink transmission resource is not selected by the first selecting unit, where the second communication resource allocation message frame includes a second minimum value of the OFDMA contention window, and the second minimum value is smaller than the first minimum value;
and a second selecting unit, configured to select the random number again between 0 and the second minimum value, and randomly select the uplink transmission resource based on the selected random number again.
7. An access point, comprising: communication device of a wireless local area network according to claim 4 or 5.
8. A station, comprising: communication device of a wireless local area network according to claim 6.
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