US20150382380A1 - Ofdma contention method and access point - Google Patents

Ofdma contention method and access point Download PDF

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Publication number
US20150382380A1
US20150382380A1 US14/843,770 US201514843770A US2015382380A1 US 20150382380 A1 US20150382380 A1 US 20150382380A1 US 201514843770 A US201514843770 A US 201514843770A US 2015382380 A1 US2015382380 A1 US 2015382380A1
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contention
succeeding
access point
station
period
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Yunbo Li
Tianyu Wu
Lianbo ZHANG
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Assigned to HUAWEI TECHNOLOGIES CO., LTD. reassignment HUAWEI TECHNOLOGIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WU, TIANYU, ZHANG, Lianbo, LI, YUNBO
Publication of US20150382380A1 publication Critical patent/US20150382380A1/en
Priority to US15/891,919 priority Critical patent/US10959266B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0825—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H04W72/005—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1205—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • 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]

Definitions

  • Embodiments of the present invention relate to computer and communication technologies and, in particular, to an OFDMA contention method and an access point.
  • a CSMA/CA carrier sense multiple access with collision avoidance contention mechanism
  • the time to initiate a contention in the contention mechanism is determined by a STA (station) according to the channel state monitored by the STA itself. Since it is an fully distributed contention mechanism, a central controller is not needed, and it is very suitable for performing contention between stations in an unauthorized frequency band, such as, ISM (Industrial Scientific Medical), TVWS and the like.
  • a size of a contention window increases with the number of collisions, thereby adapting to various scenarios with different number of stations.
  • An OFDMA (orthogonal frequency division multiplexing access) contention is a potential solution.
  • the OFDMA contention divides a whole channel into several subchannels, and a plurality of stations can initiate contentions on different subchannels at the same time. Therefore, the time of contentions between multiple stations can be shortened, and the probability of collisions happening can be reduced.
  • the number of contention channels is generally less than that of stations.
  • the number of stations succeeding in each contention is a very important factor to an OFDMA system.
  • the more stations succeeding in each contention it means the shorter the contention process is, and the less the system cost of contention is.
  • the more the stations succeeding in each contention the more frequency selective gain can be obtained.
  • the single-channel CSMA/CA contention mechanism a selection of the size of the contention window is to reduce the probability of collisions happening.
  • the probability of collisions should be reduced, however under this precondition, for different subchannels, the more the stations which initiate contentions at the same contention time, the better.
  • the requirement of design for the contention window of the OFDMA contention is different from that of the CSMA/CA contention.
  • a larger contention window may be used, which will affect the efficiency of the OFDMA contention seriously.
  • FIG. 1 is a schematic time sequence diagram of an OFDMA contention method in the prior art, and the entire process of contention and transmitting data includes the following steps:
  • the first step a plurality of stations transmit contention frames, RTS (request to send), on a plurality of subchannels;
  • an AP transmits G-CTS (group CTS, the CTS is a response to the RTS frame) to all stations succeeding in the contention, and the AP allocates a resource to the stations succeeding in the contention in the G-CTS frame;
  • G-CTS group CTS, the CTS is a response to the RTS frame
  • the third step the stations succeeding in the contention transmit data on the allocated frequency and time resources;
  • the fourth step the AP replies to the stations with acknowledgement frames, G-BA (group BA, BA is block acknowledgement).
  • the above mentioned contention method has only one round of contention, in a situation that the number of stations succeeding in the contention is quite few due to factors such as the inappropriate contention window settings, or collisions and the like, there is no effective mechanism to further increase the number of the stations succeeding in the contention, which causes reduced system throughput.
  • Embodiments of the present invention provide an OFDMA contention method and an access point, which are used to solve the problem that the system throughput is reduced because the number of stations succeeding in a contention is few in prior art.
  • an OFDMA contention method which includes:
  • the triggering the station to enter the next channel contention period includes:
  • the repeatedly executing the steps of the receiving, by the access point, the contention request frame transmitted by the station over the subchannel, and the judging whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold, until the number of stations succeeding in contentions is greater than or equal to the preset threshold, includes:
  • the OFDMA contention method is characterized in further including:
  • the method further includes:
  • channel contention time reaches a preset time threshold, if yes, transmitting, by the access point, a contention termination frame in the broadcast mode, to notify the station that a channel contention is terminated.
  • the first request response frame when transmitting, by the access point, the first request response frame in the broadcast mode, the first request response frame is further used to allocate a resource to the station succeeding in the contention in the current channel contention period;
  • the second request response frame when transmitting, by the access point, the second request response frame in the broadcast mode, the second request response frame is further used to allocate a resource to the station succeeding in the contention in the last channel contention period.
  • the second request response frame is further used to allocate a resource to both the station succeeding in the contention in the last channel contention period and the station succeeding in the historic contention.
  • triggering the station to enter the next channel contention period includes:
  • the repeatedly executing the steps of the receiving, by the access point, the contention request frame transmitted by the station over the subchannel, and the judging whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold, until the number of stations succeeding in contentions is greater than or equal to the preset threshold, includes:
  • the method further includes:
  • the third request response frame when transmitting, by the access point, the third request response frame in the broadcast mode after waiting for the second preset time, the third request response frame is further used to allocate a resource to all stations succeeding in contentions.
  • an AP which includes:
  • a request receiving unit configured to receive a contention request frame transmitted by a station over a subchannel
  • a request processing unit configured to judge whether a sum of a number of stations succeeding in a contention in a current channel contention period and a number of stations succeeding in a historic contention is minor than a preset threshold, if yes, trigger the station to enter a next channel contention period, until a number of stations succeeding in contentions is greater than or equal to the preset threshold.
  • the request processing unit includes:
  • a first threshold judging module configured to judge whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold, if yes, transmit a first notification message to a first response module; otherwise, transmit a second notification message to a second response module;
  • the first response module configured to transmit a first request response frame in a broadcast mode according to the first notification message, to acknowledge a success of contention to a station succeeding in the contention in the current channel contention period, and trigger the station to enter the next channel contention period;
  • the second response module configured to transmit a second request response frame in the broadcast mode according to the second notification message, to acknowledge a success of contention to a station succeeding in a contention in the last channel contention period.
  • the request processing unit further includes:
  • a first number judging module configured to judge whether the number of channel contention periods reaches a preset period threshold, if yes, transmit the second notification message to the second response module; otherwise, transmit a first threshold judging message to the first threshold judging module.
  • the request processing unit further includes:
  • a first time monitoring module configured to monitor whether channel contention time reaches a preset time threshold, if yes, transmit a contention termination frame in the broadcast mode, to notify the station that a channel contention is terminated.
  • the first response module is further configured to allocate a resource to the station succeeding in the contention in the current channel contention period through the first request response frame;
  • the second response module is further configured to allocate a resource to the station succeeding in the contention in the last channel contention period through the second request response frame.
  • the second response module is further configured to allocate a resource to both the station succeeding in the contention in the last channel contention period and the station succeeding in the historic contention through the second request response frame.
  • the AP further includes: an acknowledgement response module, configured to perform an acknowledgment response, after the stations succeeding in contentions finish data transmitting.
  • the request processing unit includes:
  • a second threshold judging module configured to judge whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold, if yes, the access point waits for a first preset time without response, to trigger the station to enter the next channel contention period; otherwise, transmit a third notification message to a third response module; and
  • the third response module configured to transmit a third request response frame in the broadcast mode after waiting for a second preset time according to the third notification message, to acknowledge a success of contention to all stations succeeding in contentions;
  • request processing unit further includes:
  • a second number judging module configured to judge whether the number of channel contention periods reaches a preset period threshold, if yes, transmit the third notification message to the third response module; otherwise, transmit a second threshold judging message to the second threshold judging module.
  • the request processing unit further includes:
  • a second time monitoring module configured to monitor whether channel contention time reaches a preset time threshold, if yes, transmit the third notification message to the third response module.
  • the third response module is further configured to allocate a resource to all stations succeeding in contentions through the third request response frame.
  • the OFDMA contention method and the access point provided by the present invention may go on with initiating a contention when the number of stations succeeding in a initial contention is minor than a certain threshold, so as to increase the number of stations succeeding in contentions, and thus improve the throughput of the OFDMA system; meanwhile, the OFDMA contention method is compatible with the existing mechanism, when the number of stations succeeding in the initial contention reaches the threshold, there is no extra cost, which is easily combined with the current OFDMA system, and is convenient to be widely applied.
  • FIG. 1 is a time sequence diagram of an OFDMA contention method in the prior art
  • FIG. 2 is a flowchart of an OFDMA contention method according to the present invention.
  • FIG. 3 is a time sequence diagram of an OFDMA contention method according to an embodiment of the present invention.
  • FIG. 4 is a time sequence diagram of an OFDMA contention method according to another embodiment of the present invention.
  • FIG. 5 a is a schematic modular structure diagram of an access point implementing an OFDMA contention according to the present invention.
  • FIG. 5 b is another schematic modular diagram of an access point implementing an OFDMA contention according to the present invention.
  • FIG. 6 is a schematic modular diagram of a request processing unit according to an embodiment of the present invention.
  • FIG. 7 is a schematic modular diagram of a request processing unit in a preferred solution according to an embodiment of the present invention.
  • FIG. 8 is a schematic modular diagram of another access point implementing an OFDMA contention according to the present invention.
  • FIG. 9 is a schematic modular diagram of a request processing unit according to another embodiment of the present invention.
  • FIG. 10 is a schematic modular diagram of a request processing unit in a preferred solution according to another embodiment of the present invention.
  • FIG. 11 is a schematic hardware structure diagram of an access point device according to the present invention.
  • FIG. 12 is a schematic hardware structure diagram of a station device according to the present invention.
  • the present invention applies to an OFDMA multiple-subchannels contention system.
  • the number of stations succeeding in a first contention does not reach a certain threshold, multiple rounds of contention can be initiated continuously, so as to increase the number of STAs succeeding in contentions, and thus increase system throughput.
  • FIG. 2 is a flowchart of an OFDMA contention method according to an embodiment of the present invention, as shown in FIG. 2 , the method includes:
  • step 220 an access point receives a contention request frame transmitted by a station on a subchannel.
  • step 230 judge whether a sum of a number of station succeeding in a contention in a current channel contention period and a number of station succeeding in a historic contention is minor than a preset threshold, if yes, trigger the station to enter a next channel contention period, and execute step 220 and step 230 repeatedly until a number of stations succeeding in contentions is greater than or equal to the preset threshold.
  • the contention request frame is the RTS frame.
  • step 220 it may further includes:
  • step 210 the station is triggered to perform a channel contention.
  • a triggering mechanism is required before a station having data to be transmitted and transmits a contention request frame.
  • the triggering mechanism itself is not an important point of the protection scope of the present patent, it may be that a channel is idle for a certain length of time, for example, the length of time for which the channel is idle is DIFS (distributed (coordination function) interframe space), or, it may be receiving a contention triggering frame transmitted by the AP, for example, R-Poll.
  • the step 230 specifically includes:
  • step 231 The AP judges whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of the stations succeeding in the historic contention is minor than the preset threshold, if yes, the AP transmit a first request response frame in a broadcast mode, to acknowledge a success of contention to a station succeeding in the contention in the current channel contention period, and triggers the station to enter the next channel contention period, and execute step 220 and 231 repeatedly, until the number of stations succeeding in contentions is greater than or equal to the preset threshold; otherwise, the AP transmits a second request response frame in the broadcast mode, to acknowledge a success of contention to a station succeeding in the contention in the last channel contention period, and terminates procedure.
  • the station STA 1 after the channel is idle (i.e., CH idle) or receiving the contention triggering frame (i.e., R-Poll frame), the station STA 1 firstly performs back-off, where back-off time is T 1 , and may select a subchannel to transmit a contention request frame RTS to the access point AP if the channel is still idle after the back-off is finished.
  • the AP shall perform receipt on all subchannels, and determine the number of stations succeeding in contentions.
  • the AP will transmit a first request response frame G-CTS' in the broadcast mode, where the G-CTS' on one hand acknowledges a success of contention to the stations succeeding in the contention, and on the other hand triggers the station to enter the next channel contention period.
  • the preset threshold is 3, and the station succeeding in the contention in the first channel contention period only includes STA 1 , then the next channel contention period is going to be performed.
  • a station which is not succeed in a contention in a last channel contention period may repeat the process of transmitting a contention request, that is firstly perform back-off, and if the channel is still idle after the back-off is finished, then select a subchannel to transmit an RTS frame.
  • the AP shall judge whether the total number of the stations succeeding in contentions reaches the threshold, if it is still minor than the threshold, then the AP may reply a G-CTS' frame again. This time, the G-CTS' frame acknowledges a success of contention to the station which is just succeeding in the contention, and triggers the station to enter a next channel contention period.
  • the stations STA 2 and STA 4 firstly perform back-off, where back-off time is T 2 , and may select a subchannel to transmit contention request frames RTS to the access point AP if the channel is still idle after the back-off is finished.
  • the AP shall perform receipt on all subchannels, and judge whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold, if the judging result shows that the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is 3, which is larger than or equal to the preset threshold 3 , then the AP transmits a second request response frame G-CTS in the broadcast mode, to acknowledge a success of contention to the station succeeding in the contention in the last channel contention period.
  • the AP may repeat the step 220 and step 231 continuously, until the number of the stations succeeding in contentions reaches the preset threshold.
  • an upper limit of the number of contention periods may be set, and when the number of continuous periods in which contentions are initiated reaches the upper limit, even though the number of the stations succeeding in contentions does not reach the preset threshold, a next channel contention period would not be initiated.
  • the method further includes:
  • the access point transmits a contention termination frame in the broadcast mode, to notify the station that the channel contention is terminated.
  • the start time of monitoring the channel contention time may be that the station is triggered to perform the channel contention, or may also be that the access point begins to receive the contention request frame.
  • the contention termination frame is transmitted to all the stations in the broadcast mode, and if the station succeeding in the contention in the last channel contention period does not receive the second request response frame yet, then the station firstly completes the acknowledgement of a success of contention after receiving the contention termination frame, and then may transmit data; if the station succeeding in the contention in the last channel contention period has already received the second request response frame, then the station may directly transmit data after receiving the contention termination frame.
  • the first request response frame is further used to allocate a resource to the station succeeding in the contention in the current channel contention period;
  • the second request response frame is further used to allocate a resource to the station succeeding in the contention in the last channel contention period.
  • the second request response frame is further used to allocate a resource to both the stations succeeding in the contention in the last channel contention period and the stations succeeding in the historic contention.
  • all the stations succeeding in contentions transmit data according to the allocated frequency and/or time resources.
  • the AP After all the stations succeeding in contentions finish data transmitting, the AP transmits G-BA to perform an acknowledgement response to all the stations succeeding in contentions.
  • step 230 specifically includes:
  • step 231 ′ the access point judges whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than a preset threshold, if yes, the access point waits for a first preset time without response, to trigger the station to enter the next channel contention period, and executes the steps 220 and 231 ′ repeatedly, until the number of stations succeeding in contentions is greater than or equal to the preset threshold; otherwise, after waiting for a second preset time, the access point transmit a third request response frame in the broadcast mode, to acknowledge a success of contention to all stations succeeding in contentions, and terminates the procedure.
  • the contention triggering mechanism in this implementation may also be that a channel is idle for a certain length of time or a contention triggering frame transmitted by an AP is received.
  • t 0 is a time interval from receiving the R-Poll frame to beginning to perform back-off, which may be SIFS.
  • the AP performs receipt on all the subchannels, and judges the number of stations succeeding in contentions.
  • the number of the stations succeeding in the contention in the first channel contention period is 2, which is minor than the preset threshold 3 , the AP does not response temporarily.
  • the stations may repeat the process of transmitting a contention request, that is, firstly perform back-off, and if the channel is still idle after the back-off is finished, then select a subchannel to transmit an RTS frame.
  • the AP After receiving the RTS frame in a new channel contention period, the AP shall judge whether the sum of the number of the stations succeeding in the contention in the current channel contention period and the number of the stations succeeding in the historic contention is larger than or equal to the preset threshold, if the sum is still minor than the threshold, the above processes may be repeated, to let the stations perform back-off and initiate a contention.
  • the preset threshold if the sum is still minor than the threshold, the above processes may be repeated, to let the stations perform back-off and initiate a contention.
  • the station STA 3 succeeds in the contention in the second channel contention period of the channel contention, thus the sum of the number of the station succeeding in the contention in the current channel contention period and the number of the stations succeeding in historic contentions is 3, which is equal to the preset threshold, then the AP transmits a third request response frame in the broadcast mode after waiting for the second preset time t 2 , to acknowledge successes of contention to all the stations succeeding in contentions, and terminates procedure.
  • the AP may continuously repeat the above steps 220 and 231 ′, until the number of stations succeeding in contentions reaches the preset threshold.
  • an upper limit of the number of contention periods may be set, and when the number of continuous periods in which contentions are initiated reaches the upper limit, even though the number of the stations succeeding in contentions does not reach the preset threshold, a contention in a new channel contention period would not be initiated.
  • the method further includes:
  • the method further includes: monitoring whether channel contention time reaches a preset time threshold, if yes, directly executing the step of transmitting, by the access point, the third request response frame in the broadcast mode after waiting for the second preset time, to acknowledge the successes of contention to all the stations succeeding in contentions.
  • a preset time threshold if yes, directly executing the step of transmitting, by the access point, the third request response frame in the broadcast mode after waiting for the second preset time, to acknowledge the successes of contention to all the stations succeeding in contentions.
  • the AP When the number of all the stations succeeding in contentions reaches the preset threshold, or the number of continuous contention periods reaches the preset period threshold, or the channel contention time reaches the preset time threshold, the AP will transmit a G-CTS frame at time t 2 after the RTS frame in the last channel contention period is transmitted.
  • the third request response frame G-CTS acknowledges a success of contention to all stations succeeding in contentions. Meanwhile, the third request response frame G-CTS also allocates frequency and/or time resources to all the stations succeeding in contentions.
  • t 1 may be PIFS (point (coordination function) interframe space) or DIFS, whereas t 2 may be SIFS (short interframe space).
  • the AP After all the stations succeeding in contentions finish data transmitting, the AP transmits G-BA to perform acknowledgement response to all the stations succeeding in contentions.
  • FIG. 5 a is a schematic modular structure diagram of an access point of the present invention, as shown in FIG. 5 a , the access point includes:
  • a request receiving unit 520 configured to receive a contention request frame transmitted by a station on a subchannel
  • a request processing unit 530 configured to judge whether a sum of a number of stations succeeding in a contention in a current channel contention period and a number of stations succeeding in a historic contention is minor than a preset threshold, if yes, trigger the station to enter a next channel contention period.
  • the access point further includes:
  • a contention triggering unit 510 configured to make the station be triggered to perform a channel contention.
  • the request processing unit 530 includes:
  • a first threshold judging module 531 configured to judge whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold after the channel contention, if yes, transmit a first notification message to a first response module; or transmit a second notification message to a second response module;
  • the first response module 532 configured to transmit a first request response frame in a broadcast mode according to the first notification message, to acknowledge a success of contention to a station succeeding in the contention in the current channel contention period, and trigger the station to enter the next channel contention period;
  • the second response module 533 configured to transmit a second request response frame in the broadcast mode and according to the second notification message, to acknowledge a success of contention to a station succeeding in the contention in the last channel contention period.
  • the request processing unit 530 further includes:
  • a first number judging module 534 configured to judge whether the number of channel contention periods reaches a preset period threshold, if yes, transmit the second notification message to the second response module 533 ; otherwise, transmit a first threshold judging message to the first threshold judging module 531 .
  • the first threshold judging module 531 will judge whether the sum of the number of the stations succeeding in the contention in the current channel contention period and the number of the stations succeeding in the historic contention is minor than the preset threshold after the channel contention according to the first threshold judging message, if yes, transmit the first notification message to the first response module 532 ; otherwise, transmit the second notification message to the second response module 533 .
  • the request processing unit 530 further includes: a first time monitoring module, configured to monitor whether channel contention time reaches a preset time threshold, if yes, transmit a contention termination frame in the broadcast mode, to notify the station that the channel contention is terminated.
  • the first response module 532 is further configured to allocate a resource to the stations succeeding in the contention in the current channel contention period through the first request response frame; and the second response module 533 is further configured to allocate a resource to the stations succeeding in the contention in the last channel contention period through the second request response frame.
  • the second response module is further configured to allocate a resource to both the stations succeeding in the contention in the last channel contention period and the stations succeeding in the historic contention through the second request response frame.
  • the access point may further include:
  • an acknowledgement response module 540 configured to perform an acknowledgment response after the stations succeeding in contentions finish data transmitting.
  • the request processing unit 530 includes:
  • a second threshold judging module 531 ′ configured to judge whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold, if yes, the access point waits for a first preset time without response, to trigger the station to enter the next channel contention period; otherwise, transmit a third notification message to a third response module 533 ′; and
  • the third response module 533 ′ configured to transmit a third request response frame in the broadcast mode after waiting for a second preset time according to the third notification message, to acknowledge a success of contention to all the stations succeeding in contentions; where length of the first preset time is longer than that of the second preset time.
  • the request processing unit further includes:
  • a second number judging module 534 ′ configured to judge whether the number of channel contention periods reaches a preset period threshold, if yes, transmit the third notification message to the third response module 533 ′; otherwise, transmit a second threshold judging message to the second threshold judging module 531 ′.
  • the second threshold judging module 531 ′ judges whether the sum of the number of stations succeeding in the contention in the current channel contention period and the number of stations succeeding in the historic contention is minor than the preset threshold according to the second threshold judging message, if yes, the access point waits for a first preset time without response, to trigger the station to enter the next channel contention period; otherwise, transmits the third notification message to the third response module 533 ′.
  • the request processing unit 530 further includes: a second time monitoring module, configured to monitor whether channel contention time reaches a preset time threshold, if yes, transmit the third notification message to the third response module.
  • the third response module 533 ′ is further configured to allocate a resource to all the stations succeeding in contentions through the third request response frame.
  • FIG. 11 illustrates an embodiment of an access point device, as shown in FIG. 11 , the structure of the access point device 1100 is similar to that of a computer in the prior art, and the access point device 1100 may communicate with peripheral devices, such as an station through a network interface 1110 , to realize contention triggering, receiving a contention request from the station, and replying a request response frame and etc.; and may also realize the above functions through an input interface 1120 and an output interface 1130 .
  • a processor 1140 may be used to process the contention requests from each station, and control the network interface 1110 , or the input interface 1120 and the output interface 1130 to perform data exchange with each station.
  • the network interface 1110 , the input interface 1120 , the output interface 1120 and the processor 1140 communicate with each other through a bus.
  • FIG. 12 illustrates an embodiment of a station device
  • the station device 1200 includes an antenna 1210 , a transmitting circuit 1220 , a receiving circuit 1230 , a power controller 1240 , a processing unit 1250 and a memory 1260 .
  • the processing unit 1250 controls operations of the station device 1200 , the processing unit 1250 may also be called as CPU.
  • the memory 1260 may include a read-only memory and a random access memory, and provide instructions and data to the processing unit 1250 . Part of the memory 1260 may further include a nonvolatile random access memory (NVRAM).
  • NVRAM nonvolatile random access memory
  • the station device may be embedded into or itself may be a wireless communication device such as a mobile telephone and the like, and may further include a carrier for containing the transmitting circuit 1220 and the receiving circuit 1230 , so as to allow the station device 1200 to perform data transmitting and receiving in a remote position.
  • the transmitting circuit 1220 and the receiving circuit 1230 may be coupled to the antenna 1210 .
  • Each component of the station device 1200 may be coupled together through a bus system 1270 , where, besides the data bus, the bus system 1270 may further include a power bus, a control bus, and a status signal bus. However, for clarity, each kind of buses is labeled as the bus system 1270 .
  • the station device 1200 may further include a power controller 1240 .
  • the processing unit 1250 may implement or execute each step and logic diagram disclosed in the method embodiments of the present invention.
  • the processing unit 1250 may be a micro processor or may also be any ordinary processor, decoder and etc.
  • a software module may be located at a ordinary storage medium in the art such as a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrical erasable programmable memory, or a register and the like.
  • the storage medium is located at the memory 1260 , where the processing unit 1250 reads information in the memory 1260 , and implement steps in the above methods with combination of its hardware.
  • the OFDMA contention method and the access point may go on with initiating a contention when the number of stations succeeding in a initial contention is minor than a certain threshold, so as to increase the number of stations succeeding in contentions, and thus improve the throughput of the OFDMA system; meanwhile, the OFDMA contention method is compatible with the existing mechanism, when the stations succeeding in the initial contention reaches the threshold, there is no extra cost, which is easily combined with the current OFDMA system, and is convenient to be widely applied.
  • aspects or possible implementation of various aspects of the present invention may be embodied as a system, method or computer program products. Accordingly, aspects, or possible implementation of various aspects of the present invention may use a form of an embodiment of entirely hardware, an embodiment of entirely software (including firmware, resident software, etc.), or an embodiment of a combination of software and hardware, which are referred to as “circuit”, “module” or “system” herein. Moreover, various aspects or possible implementations of various aspects of the present invention may use the form of a computer program product, where the computer program product refers to computer readable program codes stored in a computer readable medium.
  • the computer readable storage medium may be a computer readable signal medium or a computer readable storage medium.
  • the computer readable storage medium includes but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or apparatuses, or any suitable combination of the foregoing, such as a random access memory (RAM), a read only memory (ROM), an erasable programmable read only memory (EPROM or flash memory), an optical fiber, or a portable read-only memory (CD-ROM).
  • RAM random access memory
  • ROM read only memory
  • EPROM or flash memory erasable programmable read only memory
  • CD-ROM portable read-only memory
  • the processor in a computer reads the computer readable program code stored in the computer readable medium, such that the processor can execute a functional action as specified in each step or a combination of different steps in the flow chart; generate an apparatus that implements the functional action as specified in each block or a combination of different blocks in the diagram.
  • the computer readable program code may be entirely executed on a user's computer, partly executed on the user's computer, as a separate package, partly executed on the user's computer and partly executed on a remote computer, or entirely executed on a remote computer or a processor. It should also be noted that, in some alternative embodiments, each step in the flowchart, or function indicated in each block in the diagram, may not occur in accordance with the sequence indicated in the figures. For example, depending on the functionality involved, two steps or two blocks shown in succession, may actually be executed concurrently, or the blocks may sometimes be executed in the reverse order.

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