CN102938909B - The sweep-out method of redundancy NAV duration in a kind of WLAN (wireless local area network) TXOP - Google Patents
The sweep-out method of redundancy NAV duration in a kind of WLAN (wireless local area network) TXOP Download PDFInfo
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Abstract
The invention discloses the sweep-out method of redundancy NAV duration in a kind of WLAN (wireless local area network) TXOP, have two schemes, scheme one: in MU-MIMO transmission, when being transferred to last frame, notice STA receives last frame at present; Described STA reply BA response frame in add indication information, inform STA ambient stations this be last frame data; After when the frame that receiving station is judged to be currently received is last frame, the website removing useless duration also needs a satisfied condition, and the NAV duration value removed exactly is less than the difference of main long NAV and vice-minister NAV; If the website receiving BA response frame needs action to wait for, a timeout time could action to some extent.Scheme two, arranges and detects under website meets the condition removing useless duration, remove remaining or useless NAV duration, but is still needed the timeout time of wait could action to some extent by its association website arranging NAV.
Description
Technical field
The present invention relates to the sweep-out method of redundancy NAV duration in a kind of WLAN (wireless local area network) TXOP.
Background technology
In WLAN, base station is otherwise known as access website (AP, access point), and no matter user is how many, the capital construction of WLAN (wireless local area network) not much difference in itself, but make many problems following due to the introducing of multi-user.Several scenes exemplified as follows describe the problem that current WLAN (wireless local area network) is brought after multiple access.
Scene 1: transmitting station sends RTS to receiving station or short data frame arranges NAV duration, wherein a kind of NAV is arranged is to send the TXOP time limit of type of service as NAV duration.As shown in schematic diagram 1, AP sends data to receiving station, if transfer of data completes in TXOP, transmitting station AP can discharge the residue TXOP time by sending CF-END frame, and the website of reception CF-END frame is without the need to responding this frame.But CF-END frame can only remove the NAV residual time length of the receiving station of this transmitting station institute sphere of action, see Fig. 1, namely AP can remove the residual time length of STA4, but STA4 is arranged the NAV of STA5 still to be existed, thus make the website of similar STA5 that lower waste a large amount of time is set at NAV, reduce the throughput of wireless local area network (WLAN) system.
Scene 2: because WLAN (wireless local area network) usable spectrum is limited in scope, thus make different B SS institute service band can be overlapping, cause overlapping BSS (OBSS) scene as shown in Figure 2.At this moment, when AP1 will carry out MU-MIMO operation to site STA 1, STA2 and STA5, the RTS that AP1 sends or short data frame need the response of site STA 1, STA2 and STA5, thus site STA 5 will arrange NAV duration to site STA 7.Again due to optimum configurations difference (the such as Cyclic Prefix of different bandwidth in WLAN (wireless local area network), protection interval etc.), therefore during MU-MIMO transmission, need each STA available bandwidth identical, but the available channel bandwidth that station probes can be made to arrive due to factors such as interference in actual environment is different, so transmitting station needs to select the website that can do MU-MIMO transmission again, when STA5 is not selected as again service object, STA7 still can be arranged NAV for a long time cannot carry out transfer of data, thus waste its plenty of time, and waste the bandwidth usage of STA7 place BSS.If site STA 4 belongs to the BSS of AP2, so site STA 4 couples of STA3 also have same effect.In reality, this scene is very common, thus greatly reduces the throughput of system.
In sum, can learning from exemplified scene in the network operation of WLAN (wireless local area network) and have a large amount of durations to be wasted, being used if do not managed, greatly can reduce the throughput of system.
Summary of the invention
Goal of the invention: in WLAN (wireless local area network) because spectrum overlapping and TXOP residual time length cannot eliminate caused bandwidth wastage problems, the sweep-out method of redundancy NAV duration in this kind of WLAN (wireless local area network) TXOP of proposition, problem throughput-maximized when being intended to solve MU-MIMO transmission in WLAN (wireless local area network).
This programme makes the similar scene problem of the cited case be solved under the prerequisite of not changing existing WLAN (wireless local area network) mechanism, introduces the proprietary term in some WLAN (wireless local area network) below.
First introduce feature and the effect of TXOP, when website is used Qos (+) CF-Poll frame poll by HC, it just obtains a TXOP.The time limit of this TXOP is specified by the TXOP upper limit son field in " Qos control " field.The NAV of protection TXOP is arranged by the duration field comprised in the frame of CF-Poll function.After obtaining a TXOP, as long as meet the TXOP time limit, website can transmit multiple Frame switch sequence in the poll TXOP specified.If any making an immediate response that frame transmission and any expectation receive from the other side MAC cannot complete before TXOP terminates, then website can not start to transmit a frame.If " the TXOP upper limit " son field comprised in the Qos Frame of CF-Poll in " Qos control " field is set to 0, then website responds the empty frame of MPDU or QOS.
Website by be arranged on send to AP Qos Frame in " requirement of TXOP duration " or " queue length " son field ask a TXOP thereafter.One of these son fields are mutual exclusions, both website can only be arranged.By arranging " the TXOP duration of asking " field, the specific additional transmissions time that site requests represents with a TXOP, to transmit the Frame in its queue.By arranging " queue length " son field, website shows flow to be sent in this website queue to AP.
Website can transmit request in a poll TXOP or EDCA TXOP.Two kinds of requests all provide the information considered for it to AP.The TSPEC of website these information comprehensive, the similar information come from other websites and relevant various communication stream classifications carrys out correspondingly distribution T XOP.
" TXOP time limit " son field appears in QOS (+) CF-Poll frame, and field value, in units of 32us, indicates the time limit that AP authorizes for next TXOP.TXOP SIFS cycle after QOS (+) CF-Poll frame starts.TXOP time limit value means transmission one MPDU or at once " QOS is empty " frame when being 0 after QOS (+) CF-Poll." queue size " son field is indicated in the traffic sending and the non-ap stations point of this frame cushions.It appears in " QOS control " field, and AP can use this field, and considers the contention requests from other websites, decides the duration that it authorizes this website.
The value of " queue size " is total length website corresponding to the queue of specifying TID, is rounded to 256 nearest multiples, and provides in units of 256 eight bits.Any buffered communication not corresponding to this TID is indicated when " queue size " value is 0." queue size " value 254 is used to all queues being greater than 64768 eight bits." queue size " value indicates a unspecified or unknown size when being 255.One as " queue size " substitutes, and non-ap stations point can ask the TXOP duration desired by it.
" the TXOP duration of asking " specifies in units of 32us." the TXOP duration of asking " is that 0 expression does not ask TXOP for appointment TID." the TXOP duration of asking " is not cumulative.For a specific T ID the request of TXOP duration by rewrite any before the TXOP duration request to this TID.
Technical scheme: for the scene 1 in background technology, the present invention proposes the sweep-out method of redundancy NAV duration in a kind of WLAN (wireless local area network) TXOP, comprises the steps:
The last frame that in MU-MIMO transmission, STA receives, because transmitting station is known, this frame of receiving station is last frame to have two kinds of methods to tell, one be transmission frame in front more data bit be set to 0, i.e. countless certificate; Another kind needs transmitting station to indicate this STA to be last frame, and BAR frame now needs to make certain amendment, gets an instruction by 9 reservation positions of B3 to B11;
Described STA add in the BA response frame of replying indication information to inform STA ambient stations this be last frame data, BA frame now needs to make certain amendment, retains in positions get an instruction by 9 of B3 to B11; Or use scrambler to indicate this frame to be last frame;
After when the frame that receiving station is judged to be currently received is last frame, the website removing useless duration also needs a satisfied condition, the NAV duration value removed exactly is less than the difference of main long NAV and vice-minister NAV, not only can not disturb other websites after so removing, the throughput of system of this website can also be increased.If the website receiving BA response frame needs action to wait for, a timeout time could action to some extent.The described timeout time is arranged according to different scene, DIFS duration, SIFS duration, AIFS duration, PIFS duration or largest frames duration etc., not affect the competition of other websites, the timeout time also can be other values, and this time value can be considered for different scene.
For the scene 2 in background technology, the present invention proposes the sweep-out method of redundancy NAV duration in a kind of WLAN (wireless local area network) TXOP, comprises the steps:
(1) detect website and meet the condition removing useless duration, the NAV duration value namely removed is less than the difference of main long NAV and vice-minister NAV, not only can not disturb other websites after making removing, can also increase the throughput of system of this website.
(2) any one website meets the condition removing useless duration, just can remove remaining or useless NAV duration, but is still needed wait timeout time could action to some extent by its association website arranging NAV; The described timeout time is DIFS duration not affect the competition of other websites, also can be other values, can consider for different scene.
Beneficial effect: method of the present invention compared with prior art, the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP provided by the present invention: need when MAC layer does not increase unnecessary signaling consumption, make the website in WLAN (wireless local area network) effectively can eliminate remaining NAV duration and eliminate useless NAV to arrange, and make bandwidth more effectively be utilized, the program can improve the throughput of system of WLAN (wireless local area network) to a great extent.
Accompanying drawing explanation
Fig. 1 is the wireless local area network (WLAN) system schematic diagram that there is TXOP residual time length in prior art;
Fig. 2 is that prior art midband overlap takies the wireless local area network (WLAN) system schematic diagram causing website sky to wait duration;
Fig. 3 .1 is the BAR frame structure amendment 1 of the embodiment of the present invention;
Fig. 3 .2 is the BAR frame structure amendment 2 of the embodiment of the present invention;
Fig. 4 .1 is the BA frame structure amendment 1 of the embodiment of the present invention;
Fig. 4 .2 is the BA frame structure amendment 2 of the embodiment of the present invention.
Fig. 5 is that the removing NAV duration of the embodiment of the present invention satisfies condition schematic diagram;
Fig. 6 is that the residue NAV duration of the embodiment of the present invention removes flow chart;
Fig. 7 is the embodiment of the present invention and IEEE 802.11ac agreement throughput comparative graph.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Scene 1: transmitting station sends RTS to receiving station or short data frame arranges NAV duration, wherein a kind of NAV is arranged is to send the TXOP time limit of type of service as NAV duration.As shown in schematic diagram 1, AP sends data to receiving station, if transfer of data completes in TXOP, transmitting station AP can discharge the residue TXOP time by sending CF-END frame, receive the website of CF-END frame without the need to responding this frame, but CF-END frame can only remove the receiving station of this transmitting station institute sphere of action, see Fig. 1, namely AP can remove the residual time length of STA4, but STA4 is arranged the NAV of STA5 still to be existed, thus make the website of similar STA5 that lower waste a large amount of time is set at NAV, reduce the throughput of wireless local area network (WLAN) system, for this enforcement scene, the elimination useless NAV duration scheme used that the present embodiment proposes is as follows:
(1) last frame that in MU-MIMO operation, STA receives, because transmitting station (AP) is known, this frame of receiving station is last frame to have two kinds of methods to tell, one be transmission frame in front more data bit be set to 0, i.e. countless certificate; Another kind needs transmitting station to indicate this STA to be last frame, now needs to make certain amendment to BAR frame, as shown in Fig. 3 .1 and 3.2, retains in position get an instruction by 9 of B3 to B11.
(2) this STA add in the BA response frame of replying indication information to inform this STA ambient stations this be last frame data, BA frame now needs to make certain amendment, as shown in Fig. 4 .1 and 4.2, retains in positions get an instruction by 9 of B3 to B11; Also scrambler can be used to be last frame to indicate this frame.
(3) after when the frame judging to be currently received when receiving station is last frame, the website removing useless duration is wanted also to need a satisfied condition, the NAV duration value removed exactly is less than the difference of main long NAV and vice-minister NAV, not only other websites can not be disturbed after so removing, can also increase the throughput of system of this website, schematic diagram as shown in Figure 5.
(4) any one website meets the condition removing useless duration, just can remove remaining or useless NAV duration, but it should be noted that the website receiving BA response frame want to have action must wait for a timeout time could action to some extent (this time can be DIFS duration not affect the competition of other websites, also can be other values, can consider for different scene).The schematic flow sheet of this scene as shown in Figure 6.
Scene 2: because WLAN (wireless local area network) usable spectrum is limited in scope, thus make different B SS institute service band can be overlapping, cause overlapping BSS(OBSS as shown in Figure 2) scene.At this moment, when AP1 will carry out MU-MIMO operation to site STA 1, STA2 and STA5, the RTS that AP1 sends or short data frame need the response of site STA 1, STA2 and STA5, thus site STA 5 will arrange NAV duration to site STA 7.Again due to optimum configurations difference (the such as Cyclic Prefix of different bandwidth in WLAN (wireless local area network), protection interval etc.), therefore during MU-MIMO transmission, need each STA available bandwidth identical, but the available channel bandwidth that station probes can be made to arrive due to factors such as interference in actual environment is different, so transmitting station needs to select the website that can do MU-MIMO transmission again, when STA5 is not selected as again service object, STA7 still can be arranged NAV for a long time cannot carry out transfer of data, thus waste its plenty of time, and waste the bandwidth usage of STA7 place BSS.If site STA 4 belongs to the BSS of AP2, so site STA 4 couples of STA3 also have same effect.In reality, this scene is very common, thus greatly reduces the throughput of system.For this scene, the elimination residue of proposition or useless NAV duration scheme also can adopt flow process as shown in Figure 6 to realize:
(1) detect website and whether meet the condition removing useless duration, the NAV duration value also namely removed is less than the difference of main long NAV and vice-minister NAV, not only can not disturb other websites after making removing, can also increase the throughput of system of this website, as shown in Figure 5.
(2) any one website meets above condition, just can remove remaining or useless NAV duration, but note by its association website that NAV is set still need wait timeout time could action to some extent (this time can be DIFS duration not affect the competition of other websites, also can be other values, can consider for different scene).
As shown in Figure 7, give along with TXOP residual time length the existing scheme of increase and the comparing result of suggesting plans in throughput performance, wherein simulation parameter is as shown in table 1, give website in figure and add up to 10, when 30 and 50 suggest plans and the throughput comparing result of traditional mechanism, abscissa is the residual time length in TXOP, as we can see from the figure along with the increase of residual time length, this programme can make the throughput-maximized of system in TXOP duration, and traditional mechanism along with the increase loss of throughput of residual time length in TXOP comparatively serious, as we can see from the figure suggest plans have significant advantage compared with existing scheme.
Table 1 simulation parameter (μ s)
| Name | Slot | SIFS | DIFS | PIFS | BA | BAR | RTS | CTS |
| cost | 9 | 16 | 34 | 25 | 60 | 52 | 48 | 40 |
Claims (6)
1. the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP, wherein, TXOP represents transmission opportunity, and NAV represents network allocation vector; It is characterized in that, comprise the steps:
Step 1, in MU-MIMO transmission, when being transferred to last frame, notice STA receives last frame at present; MU-MIMO represents multi-user-multiple-input and multiple-output, and STA represents website;
Step 2, described STA reply BA response frame in add indication information, inform STA ambient stations this be last frame data;
Step 3, after when the frame that receiving station is judged to be currently received is last frame, the website removing useless duration also needs a satisfied condition, and the NAV duration value removed exactly is less than the difference of main long NAV and vice-minister NAV;
Step 4, if the website receiving BA response frame needs action to wait for, a timeout time could action to some extent.
2. the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP as claimed in claim 1, it is characterized in that: in step 1, because transmitting station is known, the frame of the current transmission of receiving station is last frame to have two kinds of methods to tell; One be by transmission frame in front more data bit be set to 0, i.e. countless certificate; Another kind needs transmitting station to indicate this STA to be last frame, and BAR frame now needs to make certain amendment, gets an instruction by 9 reservation positions of B3 to B11.
3. the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP as claimed in claim 1, it is characterized in that: in step 2, described STA adds indication information to inform that the current transmission frame of the ambient stations of STA is last frame data in the BA response frame of replying, BA frame now needs to make certain amendment, gets an instruction by 9 reservation positions of B3 to B11; Or use scrambler to indicate this frame to be last frame.
4. the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP as claimed in claim 1, it is characterized in that: the described timeout time is arranged according to different scene, is DIFS duration, SIFS duration, PIFS duration, AIFS duration or largest frames duration.
5. the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP, wherein, TXOP represents transmission opportunity, and NAV represents network allocation vector; It is characterized in that, comprise the steps:
Step a1, arrange detection website and meet the condition removing useless duration, the NAV duration value namely removed is less than the difference of main long NAV and vice-minister NAV;
Step a2, under any one website meets the condition removing useless duration, then removes remaining or useless NAV duration, but is still needed the timeout time of wait could action to some extent by its association website arranging NAV.
6. the sweep-out method of redundancy NAV duration in WLAN (wireless local area network) TXOP as claimed in claim 5, it is characterized in that: the described timeout time is arranged according to different scene, is DIFS duration, SIFS duration, PIFS duration, AIFS duration or largest frames duration.
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| CN1557076A (en) * | 2001-09-27 | 2004-12-22 | ����ɭ�绰�ɷ�����˾ | Method for multihop routing for distributed WLAN networks |
| EP1594259A1 (en) * | 2004-05-07 | 2005-11-09 | Infineon Technologies AG | Extension of initiation messages to improve channel estimation |
| CN101401334A (en) * | 2006-01-10 | 2009-04-01 | 科胜讯***公司 | Symmetric transmit opportunity(txop) truncation |
| CN102769898A (en) * | 2011-05-04 | 2012-11-07 | 华为技术有限公司 | Power saving mode management method and device of communication equipment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557076A (en) * | 2001-09-27 | 2004-12-22 | ����ɭ�绰�ɷ�����˾ | Method for multihop routing for distributed WLAN networks |
| EP1594259A1 (en) * | 2004-05-07 | 2005-11-09 | Infineon Technologies AG | Extension of initiation messages to improve channel estimation |
| CN101401334A (en) * | 2006-01-10 | 2009-04-01 | 科胜讯***公司 | Symmetric transmit opportunity(txop) truncation |
| CN102769898A (en) * | 2011-05-04 | 2012-11-07 | 华为技术有限公司 | Power saving mode management method and device of communication equipment |
Non-Patent Citations (1)
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| Lei Du etc.Receiver Initiated Network Allocation Vector Clearing Method in WLANs.《2005 Asia-Pacific Conference on Communications, Perth, Western Australia》.2005,参见正文第1-3节. * |
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