CN102547785B - Detection method and system for enhanced virtual carrier waves - Google Patents
Detection method and system for enhanced virtual carrier waves Download PDFInfo
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Abstract
The invention discloses a detection method and system for enhanced virtual carrier waves; the detection method comprises the following step: a website detects virtual carrier waves by using a first time variable and a second time variable and determines whether wireless frames are transmitted according to the detection result of the virtual carrier waves, wherein the first time variable comprises a first ending moment which indicates that the busy state of a channel is ended, and the second time variable comprises a second ending moment which indicates that the busy state of the channel is ended. According to the detection method, the two set time variables are adopted for carrying out virtual carrier detection and response reply, thereby the problem that the website can not timely reply whether the current channel is unoccupied is solved, and then the effect that the website replies at once the channel is unoccupied is achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of virtual carrier detection method and system of enhancing.
Background technology
WLAN (Wireless Local Area Networks; WLAN) be that the employing wireless communication technology is interconnected by computer equipment, form the network system that can communicate mutually and realize resource-sharing.The feature of WLAN (wireless local area network) essence does not re-use telecommunication cable to be coupled together by computer and network, but wirelessly connect, thus make the movement of the structure of network and terminal more flexible.IEEE802.11 is one of mainstream technology of current WLAN (wireless local area network), and this agreement mainly specifies that physical layer (PHY) and media interviews control (MAC) layer specification.
Along with the development of mobile communication technology and people are to the raising of the demand of wireless network, physical layer specification is towards the more and more higher direction development of speed, experienced by 802.11 to 802.11b and arrive 802.11a/g again, then 802.11n, finally arrive the development course of 802.11ac.Actual physical technique also develops into OFDM technology from direct sequence spread spectrum skill, and introduces multi-antenna technology in IEEE802.11n, introduces large bandwidth and MU-MIMO in IEEE802.11ac.
In current I EEE802.11 system, website carries out carrier detect to judge that whether present channel is idle before transmission data, usual carrier detect is divided into physical carrier to detect and virtual carrier detects, a kind of mode that virtual carrier detects arranges a network allocation vector at website, network allocation vector numerical value instruction be a time point, before time point indicated by it, website thinks that channel around it is shared by other website, website can not seize channel to carry out data transmission, only have when the numerical value of network allocation vector equals 0, website is just had an opportunity to seize channel and is carried out data transmission, the numerical value of network allocation vector is that the information entrained by the frame by receiving the receiver address not MAC Address of oneself upgrades, and only have when time point indicated by the numerical value that the time point indicated by the information in received frame is later than current network allocation vector, just the numerical value of network allocation vector can be upgraded, the time point of the value points after renewal is the time point indicated by information in received frame.The numerical value of network allocation vector can do in time and successively decrease accordingly.According to existing virtual carrier testing mechanism, receive a frame and need to make reply when website, if now the numerical value of network allocation vector is not 0, website can not make replying response.
Summary of the invention
Main purpose of the present invention is the virtual carrier detection method and the system that provide a kind of enhancing, can not reply the whether idle problem of present channel in time to solve website.
According to an aspect of the present invention, provide a kind of virtual carrier detection method of enhancing, it comprises: website uses very first time variable and/or the second time variable to carry out virtual carrier detection, and determine whether to send radio frames according to the result that virtual carrier detects, wherein, above-mentioned very first time variable comprises the first finish time that indicating channel busy state terminates, and above-mentioned second time variable comprises the second finish time that indicating channel busy state terminates.
Further, above-mentioned first finish time is the moment the latest that above-mentioned website is terminated by the channel busy state receiving radio frames acquisition; The moment the latest that the channel busy state that above-mentioned second finish time, to be above-mentioned website obtained by the radio frames received from non-present networks terminates.
Further, above-mentioned website receives specific and after needing the radio frames of above-mentioned station replies, use above-mentioned very first time variable and/or above-mentioned second time variable to carry out virtual carrier detection, and determine to send above-mentioned radio frames according to the result that above-mentioned virtual carrier detects.
Further, above-mentioned specific and need the radio frames of above-mentioned station replies comprise following one of at least: the predetermined radio frames sending address and/or receiver address, the radio frames of predetermined frame type.
Further, according to the result that virtual carrier detects, above-mentioned website determines whether that the step sending radio frames comprises: if above-mentioned second time variable is 0, then above-mentioned website sends above-mentioned radio frames; Otherwise above-mentioned website does not send above-mentioned radio frames.
Further, according to the result that virtual carrier detects, above-mentioned website determines whether that the step sending radio frames comprises: if above-mentioned very first time variable is 0, then above-mentioned website sends above-mentioned radio frames; If above-mentioned very first time variable is not 0 and above-mentioned second time variable is 0, then above-mentioned website sends above-mentioned radio frames, otherwise above-mentioned website does not send above-mentioned radio frames.
Further, when above-mentioned website uses above-mentioned very first time variable to carry out virtual carrier detection, also comprise: above-mentioned website receives a radio frames, wherein, the receiver address of above-mentioned radio frames is different from above-mentioned site address; Channel busy state finish time indicated by the information that above-mentioned radio frames is carried is later than the first finish time that above-mentioned indicating channel busy state that above-mentioned very first time variable comprises terminates; Above-mentioned website upgrades above-mentioned very first time variable, the channel busy state finish time indicated by the information that the first finish time indicating channel busy state to terminate in the above-mentioned very first time variable after renewal carries for the above-mentioned radio frames received.
Further, when above-mentioned website uses above-mentioned second time variable to carry out virtual carrier detection, also comprise: above-mentioned website receives a radio frames, wherein, the receiver address of above-mentioned radio frames is different from above-mentioned site address; The transmission address of above-mentioned radio frames and the access website address of network associated by above-mentioned website or different with other site address of network associated by above-mentioned website; Channel busy state finish time indicated by the information that above-mentioned radio frames is carried is later than the second finish time that indicating channel busy state that above-mentioned second time variable comprises terminates; Above-mentioned website upgrades above-mentioned second time variable, the channel busy state finish time indicated by the information that the second finish time indicating channel busy state to terminate in above-mentioned second time variable after renewal carries for the above-mentioned radio frames received.
According to a further aspect in the invention, provide a kind of virtual carrier detection system of enhancing, be arranged in website, this system comprises: detecting unit, virtual carrier detection is carried out for using very first time variable and/or the second time variable, wherein, above-mentioned very first time variable comprises the first finish time that indicating channel busy state terminates, and above-mentioned second time variable comprises the second finish time that indicating channel busy state terminates; Processing unit, the result for detecting according to virtual carrier determines whether to send radio frames.
Further, said system also comprises: the first receiving element, for receiving specific and needing the radio frames of above-mentioned station replies, and receiving specific and after needing the radio frames of above-mentioned station replies, notifying that above-mentioned detecting unit performs and use very first time variable and/or the second time variable carry out the step of virtual carrier detection and notify that above-mentioned processing unit performs the step that the result detected according to virtual carrier determines whether to send radio frames.
Further, above-mentioned processing unit comprises: the first judging unit, for judging whether above-mentioned second time variable is 0; First transmitting element, for when above-mentioned second time variable is 0, sends above-mentioned radio frames.
Further, above-mentioned processing unit comprises: the second judging unit, for judging whether above-mentioned very first time variable is 0; And when above-mentioned very first time variable is not 0, judge whether above-mentioned second time variable is 0; Second transmitting element, for when above-mentioned very first time variable is 0, sends above-mentioned radio frames; Or, when above-mentioned very first time variable is not 0 and above-mentioned second time variable is 0, send above-mentioned radio frames.
Further, said system also comprises: the second receiving element, and for when using above-mentioned very first time variable to carry out virtual carrier detection, receive a radio frames, wherein, the receiver address of above-mentioned radio frames is different from above-mentioned site address; Channel busy state finish time indicated by the information that above-mentioned radio frames is carried is later than the first finish time that above-mentioned indicating channel busy state that above-mentioned very first time variable comprises terminates; First updating block, for upgrading above-mentioned very first time variable, the channel busy state finish time indicated by the information that the first finish time indicating channel busy state to terminate in the above-mentioned very first time variable after renewal carries for the above-mentioned radio frames received.
Further, said system also comprises: the 3rd receiving element, and for when using above-mentioned second time variable to carry out virtual carrier detection, receive a radio frames, wherein, the receiver address of above-mentioned radio frames is different from above-mentioned site address; The transmission address of above-mentioned radio frames and the access website address of network associated by above-mentioned website or different with other site address of network associated by above-mentioned website; Channel busy state finish time indicated by the information that above-mentioned radio frames is carried is later than the second finish time that indicating channel busy state that above-mentioned second time variable comprises terminates; Second updating block, for upgrading above-mentioned second time variable, the channel busy state finish time indicated by the information that the second finish time indicating channel busy state to terminate in above-mentioned second time variable after renewal carries for the above-mentioned radio frames received.
By the present invention, adopt two time variables arranged to carry out the reply of virtual carrier detection and response, solve website and can not reply the whether idle problem of present channel in time, and then reach the effect that website makes the response of replying channel idle at once.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is a kind of preferred flow charts of the virtual carrier detection method of enhancing according to the embodiment of the present invention;
Fig. 2 is a kind of preferred structure block diagram of the virtual carrier detection system of enhancing according to the embodiment of the present invention;
Fig. 3 is the another kind of preferred flow charts of the virtual carrier detection method according to the enhancing of the embodiment of the present invention under 802.11ac system;
Fig. 4 is another preferred flow charts of the virtual carrier detection method according to the enhancing of the embodiment of the present invention under 802.11ac system.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.When not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiment 1
Fig. 1 is a kind of preferred flow charts of the virtual carrier detection method of enhancing according to the embodiment of the present invention, and it comprises the steps:
S102, website uses very first time variable and/or the second time variable to carry out virtual carrier detection, wherein, described very first time variable comprises the first finish time that indicating channel busy state terminates, and described second time variable comprises the second finish time that indicating channel busy state terminates;
S104, determines whether to send radio frames according to the result that virtual carrier detects.
In this preferred embodiment, two time variables arranged are adopted to carry out the reply of virtual carrier detection and response, solve website and can not reply the whether idle problem of present channel in time, and then reach the effect that website makes the response of replying channel idle at once.
Preferably, described first finish time is the moment the latest that described website is terminated by the channel busy state receiving radio frames acquisition; The moment the latest that the channel busy state that described second finish time, to be described website obtained by the radio frames received from non-present networks terminates.In this preferred embodiment, by limiting the first special finish time and the second finish time, effectively can solve website and can not reply the whether idle problem of present channel in time.
Preferably, described website receives specific and after needing the radio frames of described station replies, use described very first time variable and/or described second time variable to carry out virtual carrier detection, and determine to send described radio frames according to the result that described virtual carrier detects.In this preferred embodiment, by limiting the trigger condition that virtual carrier detects and sends radio frames, making website only under trigger condition, just perform aforesaid operations, thus saving overhead, improve treatment effeciency.
Preferably, described specific and need the radio frames of described station replies comprise following one of at least: the predetermined radio frames sending address and/or receiver address, the radio frames of predetermined frame type.
Preferably, according to the result that virtual carrier detects, described website determines whether that the step sending radio frames comprises: if described second time variable is 0, then described website sends described radio frames; Otherwise described website does not send described radio frames.In this preferred embodiment, by limiting the transmission condition of radio frames, can effectively, in time reply.
Preferably, according to the result that virtual carrier detects, described website determines whether that the step sending radio frames comprises: if described very first time variable is 0, then described website sends described radio frames; If described very first time variable is not 0 and described second time variable is 0, then described website sends described radio frames, otherwise described website does not send described radio frames.In this preferred embodiment, by limiting the transmission condition of radio frames, when very first time variable is not 0, effectively, in time can reply.
Preferably, when described website uses described very first time variable to carry out virtual carrier detection, virtual carrier detection method according to the enhancing of the embodiment of the present invention also comprises: described website receives a radio frames, and wherein, the receiver address of described radio frames is different from described site address; Channel busy state finish time indicated by the information that described radio frames is carried is later than the first finish time that described indicating channel busy state that described very first time variable comprises terminates; Described website upgrades described very first time variable, the first finish time indicating channel busy state to terminate in the described very first time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.In this preferred embodiment, by step of updating, can effectively, in real time upgrade currently used very first time variable.
Preferably, when described website uses described second time variable to carry out virtual carrier detection, virtual carrier detection method according to the enhancing of the embodiment of the present invention also comprises: described website receives a radio frames, and wherein, the receiver address of described radio frames is different from described site address; The transmission address of described radio frames and the access website address of network associated by described website or different with other site address of network associated by described website; Channel busy state finish time indicated by the information that described radio frames is carried is later than the second finish time that indicating channel busy state that described second time variable comprises terminates; Described website upgrades described second time variable, the second finish time indicating channel busy state to terminate in described second time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.In this preferred embodiment, by step of updating, can effectively, in real time upgrade the second currently used time variable.
Embodiment 2
Fig. 2 is a kind of preferred structure block diagram of the virtual carrier detection system of enhancing according to the embodiment of the present invention, be arranged in website, it comprises: detecting unit 202, virtual carrier detection is carried out for using very first time variable and/or the second time variable, wherein, described very first time variable comprises the first finish time that indicating channel busy state terminates, and described second time variable comprises the second finish time that indicating channel busy state terminates; Processing unit 204, the result for detecting according to virtual carrier determines whether to send radio frames.
In this preferred embodiment, two time variables arranged are adopted to carry out the reply of virtual carrier detection and response, solve website and can not reply the whether idle problem of present channel in time, and then reach the effect that website makes the response of replying channel idle at once.
Preferably, described first finish time is the moment the latest that described website is terminated by the channel busy state receiving radio frames acquisition; The moment the latest that the channel busy state that described second finish time, to be described website obtained by the radio frames received from non-present networks terminates.In this preferred embodiment, by limiting the first special finish time and the second finish time, effectively can solve website and can not reply the whether idle problem of present channel in time.
Preferably, virtual carrier detection system according to the enhancing of the embodiment of the present invention also comprises: the first receiving element 206, for receiving specific and needing the radio frames of described station replies, and receiving specific and after needing the radio frames of described station replies, notifying that described detecting unit performs and use very first time variable and/or the second time variable carry out the step of virtual carrier detection and notify that described processing unit performs the step that the result detected according to virtual carrier determines whether to send radio frames.In this preferred embodiment, by limiting the trigger condition that virtual carrier detects and sends radio frames, making website only under trigger condition, just perform aforesaid operations, thus saving overhead, improve treatment effeciency.
Preferably, described specific and need the radio frames of described station replies comprise following one of at least: the predetermined radio frames sending address and/or receiver address, the radio frames of predetermined frame type.
Preferably, described processing unit 204 comprises: the first judging unit, for judging whether described second time variable is 0; First transmitting element, for when described second time variable is 0, sends described radio frames.In this preferred embodiment, by limiting the transmission condition of radio frames, can effectively, in time reply.
Preferably, described processing unit 204 comprises: the second judging unit, for judging whether described very first time variable is 0; And when described very first time variable is not 0, judge whether described second time variable is 0; Second transmitting element, for when described very first time variable is 0, sends described radio frames; Or, when described very first time variable is not 0 and described second time variable is 0, send described radio frames.In this preferred embodiment, by limiting the transmission condition of radio frames, when very first time variable is not 0, effectively, in time can reply.
Preferably, virtual carrier detection system according to the enhancing of the embodiment of the present invention also comprises: the second receiving element 208, for when using described very first time variable to carry out virtual carrier detection, receives a radio frames, wherein, the receiver address of described radio frames is different from described site address; Channel busy state finish time indicated by the information that described radio frames is carried is later than the first finish time that described indicating channel busy state that described very first time variable comprises terminates; First updating block 210, for upgrading described very first time variable, the first finish time indicating channel busy state to terminate in the described very first time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.In this preferred embodiment, by step of updating, can effectively, in real time upgrade currently used very first time variable.
Preferably, virtual carrier detection system according to the enhancing of the embodiment of the present invention also comprises: the 3rd receiving element 212, for when using described second time variable to carry out virtual carrier detection, receives a radio frames, wherein, the receiver address of described radio frames is different from described site address; The transmission address of described radio frames and the access website address of network associated by described website or different with other site address of network associated by described website; Channel busy state finish time indicated by the information that described radio frames is carried is later than the second finish time that indicating channel busy state that described second time variable comprises terminates; Second updating block 214, for upgrading described second time variable, the second finish time indicating channel busy state to terminate in described second time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.In this preferred embodiment, by step of updating, can effectively, in real time upgrade the second currently used time variable.
Embodiment 3
The present embodiment can be applied in IEEE802.11ac system; when using many RTS/CTS to carry out the protection mechanism of channel booking before carrying out MU-MIMO transmission; each website needs to perform enhancing virtual carrier detection proposed by the invention just can complete corresponding frame sequence exchange; for this system, the parameter corresponding relation of the parameter in summary of the invention and 802.11ac system is as follows:
1) very first time variable map network configuration vector NAV;
2) in 802.11ac system, a secondary network configuration vector is increased, the second time variable and corresponding secondary network configuration vector;
3) particular frame preset has two kinds, and a kind of is that to send address field be the RTS frame of the MAC Address of access point AP, and the CTS frame of another kind to be receiver address the be MAC Address of access point AP, these two kinds of frames are in this collectively for down channel preengages frame.
Under above-mentioned corresponding relation, the enhancing virtual carrier detection judgement flow process performed at each Intra-site is as follows, see Fig. 3:
S301, website receives a frame, and whether judgement is invalid frame, if so, then performs step S307, otherwise performs step S302;
S302, judges whether this frame is the RTS frame that AP sends; If so, then perform step S304, otherwise perform step S303;
S303, according to current mechanism normal process.
S304, judges whether NAV is 0; If so, then perform step S305, otherwise perform step S306;
S305, sends CTS frame.
S306, judges whether secondary NAV equals 0, is, performs step S305, otherwise performs step S311.
S307, whether the frame received by judgement is associated networking network down channel reservation frame, is perform step S308, otherwise performs step S309;
S308, in judgment frame, whether the channel busy state finish time of duration territory instruction is later than the channel busy state finish time of NAV instruction, and namely whether Duration is greater than the moment of NAV instruction, is perform step S310, otherwise performs step S311;
S309, in judgment frame, whether the channel busy state finish time of duration territory instruction is later than the channel busy state finish time of NAV instruction, and namely whether Duration is greater than the moment of NAV instruction, is perform step S312, otherwise performs step S313;
S310, with the channel busy state finish time information updating NAV of duration territory instruction in frame.
S311, does not do further process, abandons this frame.
S312, with channel busy state finish time information updating NAV and the secondary NAV of duration territory instruction in frame.
S313, in judgment frame, whether the channel busy state finish time of duration territory instruction is later than the channel busy state finish time that secondary NAV indicates, and namely whether Duration is greater than the moment that secondary NAV indicates, if, then perform step S314, otherwise perform step S311;
S314, with the secondary NAV of duration information updating.
In addition, under above-mentioned corresponding relation, also there is another one preferred version 2 (as shown in Figure 4) in the present invention, is with scheme 1 difference shown in Fig. 3, and when receiving an one's own frame, the processing procedure of website is as follows:
S401, website receives a frame, and whether judgement is invalid frame, if so, then performs step S406, otherwise performs step S402;
S402, judges whether this frame is the RTS frame that AP sends; If so, then perform step S404, otherwise perform step S403;
S403, according to current mechanism normal process.
S404, judges whether secondary NAV is 0; If so, then perform step S405, otherwise perform step S411;
S405, sends CTS frame.
The step that S307-S314 shown in S406-S413 and Fig. 3 performs is identical.
In the examples below, each website is all that the enhancing virtual carrier detection described based on above-described embodiment judges flow process and carries out operating.
Embodiment 4
The present embodiment be scheme shown in Fig. 31 time for be the IEEE802.11ac system that there is not OBSS situation.
Further supposition access point AP carries out descending MU-MIMO transmission, and this time data of transmission containing 3 websites, 3 websites are called STA1, STA2 and STA3, AP will carry out channel booking respectively by RTS/CTS Frame switch and 3 STA before carrying out descending MU-MIMO transmission data, send to the data of STA1 to be business in primary AC, therefore first carry out channel booking with STA1;
Further supposition be 0 expression present channel under virtual carrier testing mechanism is idle when the NAV value of first three website is all 0, NAV value, is also 0 certainly according to the value in the secondary NAV of content of the present invention;
Further supposition STA1 and STA3 hides website each other.
(1) AP sends RTS frame, and the receiver address territory RA in RTS frame is the address of STA1, and sending address field TA is the address of AP,
■ STA1 receives RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detect NAV further, now the numerical value of NAV is 0, expression can send CTS frame, after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detects NAV further, the numerical value of NAV is 0, upgrade NAV, before time tl, channel is in busy state to the NAV instruction after renewal.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detects NAV further, the numerical value of NAV is 0, upgrade NAV, before time tl, channel is in busy state to the NAV instruction after renewal.
(2) after STA1 receives RTS frame, the CTS of reply, the process that each website receives after this CTS is as follows:
■ AP receives the CTS that STA1 replys, and namely thinks that the channel booking between AP and STA1 is successful.
■ STA2 receives the CTS that STA1 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t1, therefore NAV does not do and upgrades, abandon this frame.
■ STA3 can not receive the CTS that STA1 replys.
(3) after AP receives the CTS of STA1 reply, send second RTS frame, the receiver address territory RA in RTS frame is the address of STA2, and sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, and NAV is 0, therefore upgrading NAV, the moment that the NAV indicating channel busy state after renewal terminates is t2.
■ STA2 receives this RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, detect NAV, now the numerical value of NAV is not 0, then detects secondary NAV, secondary NAV value is 0, then after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t2 is later than t1, therefore upgrade NAV, the moment that the NAV indicating channel busy state after renewal terminates is t2.
(4), after STA2 replys CTS, the process that each website receives is as follows:
■ AP receives the CTS that STA2 replys, and namely thinks that the channel booking between AP and STA2 is successful.
■ STA1 receives the CTS that STA2 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t2, therefore NAV does not do and upgrades, abandon this frame.
■ STA3 receives the CTS that STA2 replys, this frame is not the frame sending to oneself, according to content of the present invention, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t2, therefore NAV does not do and upgrades, abandon this frame.
(5) after AP receives the CTS of STA2 reply, send the 3rd RTS frame, the receiver address territory RA in RTS frame is the address of STA3, and sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, the moment that NAV indicating channel busy state terminates is t2, and t3 is later than t2, therefore upgrade NAV, the moment that the NAV indicating channel busy state after renewal terminates is t3.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t3 is later than t1, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA3 receives this RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, detect NAV, now the numerical value of NAV is not 0, then detects secondary NAV, secondary NAV value is 0, then after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
(6), after STA3 replys CTS, the process after each website receives is as follows:
■ AP receives the CTS that STA3 replys, and namely thinks that the channel booking between AP and STA3 is successful.
■ STA1 can not receive the CTS of STA3.
■ STA2 receives the CTS that STA3 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t3, therefore NAV does not do and upgrades, abandon this frame.
MU-MIMO packet can be sent after AP and 3 STA channel booking success.
Embodiment 5
The present embodiment be scheme shown in Fig. 31 time for be the IEEE802.11ac system that there is not OBSS situation.
Further supposition access point AP can carry out descending MU-MIMO transmission, and this time data of transmission containing 3 websites, 3 websites are called STA1, STA2 and STA3, AP will carry out channel booking respectively by RTS/CTS Frame switch and 3 STA before carrying out descending MU-MIMO transmission data, send to the data of STA1 to be business in primary AC, therefore first carry out channel booking with STA1.
The NAV value of further supposition STA1 be 0, NAV value is 0 expression present channel under virtual carrier testing mechanism is idle; The NAV of STA2 is not 0, and the moment that its value indicating channel busy state terminates is a1, and the moment that also indicating channel busy state terminates of the value in secondary NAV is a1; The NAV of STA3 is not 0, and the moment that its value indicating channel busy state terminates is a2, and the moment that also indicating channel busy state terminates of the value in secondary NAV is a2, and moment a2 is early than moment a1.
Further, STA1 and STA3 hides website each other.
(1) AP sends RTS frame, and the receiver address territory RA in RTS frame is the address of STA1, and sending address field TA is the address of AP.
■ STA1 receives RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detect NAV, now the numerical value of NAV is 0, expression can send CTS frame, after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detect NAV again, the numerical value of NAV is not 0, and the t1 moment is later than the a1 moment, therefore upgrades NAV, before time tl, channel is in busy state in NAV instruction after renewal.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detect NAV again, the numerical value of NAV is not 0, and the t1 moment is later than the a2 moment, therefore upgrades NAV, before time tl, channel is in busy state in NAV instruction after renewal.
(2) after STA1 receives RTS frame, the CTS of reply, the process that each website receives after this CTS is as follows:
■ AP receives the CTS that STA1 replys, and namely thinks that the channel booking between AP and STA1 is successful.
■ STA2 receives the CTS that STA1 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t1, therefore NAV does not do and upgrades, abandon this frame.
■ STA3 can not receive the CTS that STA1 sends.
(3) after AP receives the CTS of STA1 reply, send second RTS frame, the receiver address territory RA in RTS frame is the address of STA2, and sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, and NAV is 0, therefore upgrading NAV, the moment that the NAV indicating channel busy state after renewal terminates is t2.
■ STA2 receives this RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detect NAV, now the numerical value of NAV is not 0, detect secondary NAV again, although secondary NAV value carries out successively decreasing now not being decremented to 0 in time, therefore do not reply CTS.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t2 is later than t1, therefore upgrade NAV, the moment t2 that the NAV indicating channel busy state after renewal terminates.
(4) AP does not receive the CTS that STA2 sends in the given time, think that the channel booking of AP and STA2 is unsuccessful, initiate the RTS for STA3 after a certain time, receiver address territory RA in RTS frame is the address of STA3, sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t3, and t3 is later than t2, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t3 is later than t1, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, detect NAV, now the numerical value of NAV is not 0, then detects secondary NAV, and secondary NAV value is 0, although its this value of this example initial setting is not 0, but it successively decreases in time and has now successively decreased 0, therefore replys CTS after certain time delay, the address of the RA domain identifier AP of CTS.
(5), after STA3 replys CTS, the process after each website receives is as follows:
■ AP receives the CTS that STA3 replys, and namely thinks that the channel booking between AP and STA3 is successful.
■ STA2 receives the CTS that STA3 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t3, therefore NAV does not do and upgrades, abandon this frame.
AP is only successful with 2 STA channel bookings, and this launches the data that MU-MIMO packet comprises STA1 and STA3.
Embodiment 6
The present embodiment be scheme shown in Fig. 31 time for be the IEEE802.11ac system that there is OBSS situation.
Further supposition access point AP can carry out descending MU-MIMO transmission, and this time data of transmission containing 3 websites, 3 websites are called STA1, STA2 and STA3, AP will carry out channel booking respectively by RTS/CTS Frame switch and 3 STA before carrying out descending MU-MIMO transmission data, send to the data of STA1 to be business in primary AC, therefore first carry out channel booking with STA1.
The NAV value of further supposition STA1 be 0, NAV value is 0 expression present channel under virtual carrier testing mechanism is idle; The NAV of STA2 is not 0, and the moment that its value indicating channel busy state terminates is a1, and the moment that also indicating channel busy state terminates of the value in secondary NAV is a1; The NAV of STA3 is not 0, and the moment that its value indicating channel busy state terminates is a2, and the moment that also indicating channel busy state terminates of the value in secondary NAV is a2; Moment a2 is early than moment a1.
Further supposition STA1 and STA3 hides website each other.
(1) AP sends RTS frame, and the receiver address territory RA in RTS frame is the address of STA1, and sending address field TA is the address of AP.
■ STA1 receives RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detect NAV, now the numerical value of NAV is 0, expression can send CTS frame, after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detect NAV again, the numerical value of NAV is not 0, and the t1 moment is later than the a1 moment, therefore upgrades NAV, before time tl, channel is in busy state in NAV instruction after renewal.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detect NAV again, the numerical value of NAV is not 0, and the t1 moment is later than the a2 moment, therefore upgrades NAV, before time tl, channel is in busy state in NAV instruction after renewal.
(2) after STA1 receives RTS frame, the CTS of reply, the process that each website receives after this CTS is as follows:
■ AP receives the CTS that STA1 replys, and namely thinks that the channel booking between AP and STA1 is successful.
■ STA2 receives the CTS that STA1 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t1, therefore NAV does not do and upgrades, abandon this frame.
■ STA3 can not receive the CTS that STA1 sends, but receive a frame during this period, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is not present networks down channel reservation frame, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is b1, detect NAV again, the moment that NAV indicating channel busy state terminates is t1, b1 is early than t1, therefore NAV does not do and upgrades, the secondary NAV of further detection, secondary NAV is not 0, and the channel busy state finish time of its instruction is a2, b1 is later than a2, therefore according to b1, secondary NAV is upgraded, secondary NAV instruction after renewal is before the b1 moment, channel is in busy state.
(3) after AP receives the CTS of STA1 reply, send second RTS frame, the receiver address territory RA in RTS frame is the address of STA2, and sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, and NAV is 0, therefore upgrade NAV, the moment t2 that the NAV indicating channel busy state after renewal terminates.
■ STA2 receives this RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detect NAV, now the numerical value of NAV is not 0, detect secondary NAV again, although secondary NAV value carries out successively decreasing now not being decremented to 0 in time, therefore do not reply CTS.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t1 is early than t2, therefore upgrade NAV, the moment t2 that the NAV indicating channel busy state after renewal terminates.
(4) AP does not receive the CTS that STA2 sends in the given time, think that the channel booking of AP and STA2 is unsuccessful, initiate the RTS for STA3 after a certain time, receiver address territory RA in RTS frame is the address of STA3, sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t3, and t2 is early than t3, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t1 is early than t3, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, detect NAV, now the numerical value of NAV is not 0, detect secondary NAV again, secondary NAV value is 0, although its this value of this example initial setting is not 0, and during RTS/CTS Frame switch above, the numerical value of secondary NAV has done and has upgraded the longer Channel holding time of instruction, but its value is successively decreased in time and has now been successively decreased 0, therefore replys CTS after certain time delay, the address of the RA domain identifier AP of CTS.
(5), after STA3 replys CTS, the process after each website receives is as follows:
■ AP receives the CTS that STA3 replys, and namely thinks that the channel booking between AP and STA3 is successful.
■ STA1 can not receive the CTS that STA3 replys, but receive a frame during this period, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is not present networks down channel reservation frame, according to content of the present invention, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is b2, detect NAV again, the moment that NAV indicating channel busy state terminates is t3, b2 is later than t3, therefore upgrade NAV, the moment b2 that NAV indicating channel busy state after renewal terminates, upgrade secondary NAV simultaneously, the moment that the numerical value indicating channel busy state of the secondary NAV after renewal terminates also is b2.
■ STA2 receives the CTS that STA3 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t3, therefore NAV does not do and upgrades, abandon this frame.
AP is only successful with 2 STA channel bookings, and this launches the data that MU-MIMO packet comprises STA1 and STA3.
Embodiment 7
The present embodiment is substantially identical with embodiment three, and difference is that the present embodiment is based on the scheme 2 shown in Fig. 4.
Further supposition access point AP can carry out descending MU-MIMO transmission, and this time data of transmission containing 3 websites, 3 websites are called STA1, STA2 and STA3, AP will carry out channel booking respectively by RTS/CTS Frame switch and 3 STA before carrying out descending MU-MIMO transmission data, send to the data of STA1 to be business in primary AC, therefore first carry out channel booking with STA1.
The NAV value of further supposition STA1 be 0, NAV value is 0 expression present channel under virtual carrier testing mechanism is idle; The NAV of STA2 is not 0, and the moment that its value indicating channel busy state terminates is a1, and the moment that also indicating channel busy state terminates of the value in secondary NAV is a1; The NAV of STA3 is not 0, and the moment that its value indicating channel busy state terminates is a2, and the moment that also indicating channel busy state terminates of the value in secondary NAV is a2; Moment a2 is early than moment a1.
Further supposition STA1 and STA3 hides website each other.
(1) AP sends RTS frame, and the receiver address territory RA in RTS frame is the address of STA1, and sending address field TA is the address of AP.
■ STA1 receives RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detect secondary NAV, now the numerical value of secondary NAV is 0, expression can send CTS frame, after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detect NAV again, the numerical value of NAV is not 0, and the t1 moment is later than the a1 moment, therefore upgrades NAV, before time tl, channel is in busy state in NAV instruction after renewal.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, detect NAV again, the numerical value of NAV is not 0, and the t1 moment is later than the a2 moment, therefore upgrades NAV, before time tl, channel is in busy state in NAV instruction after renewal.
(2) after STA1 receives RTS frame, the CTS of reply, the process that each website receives after this CTS is as follows:
■ AP receives the CTS that STA1 replys, and namely thinks that the channel booking between AP and STA1 is successful.
■ STA2 receives the CTS that STA1 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t1, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t1, therefore NAV does not do and upgrades, abandon this frame.
■ STA3 can not receive the CTS that STA1 sends, but receive a frame during this period, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is not present networks down channel reservation frame, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is b1, detect NAV again, the moment that NAV indicating channel busy state terminates is t1, b1 is early than t1, therefore NAV does not do and upgrades, the secondary NAV of further detection, secondary NAV is not 0, and the channel busy state finish time of its instruction is a2, b1 is later than a2, therefore according to b1, secondary NAV is upgraded, secondary NAV instruction after renewal is before the b1 moment, channel is in busy state.
(3) after AP receives the CTS of STA1 reply, send second RTS frame, the receiver address territory RA in RTS frame is the address of STA2, and sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, and NAV is 0, therefore upgrade NAV, the moment t2 that the NAV indicating channel busy state after renewal terminates.
■ STA2 receives this RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, and detects secondary NAV, although secondary NAV value carries out successively decreasing now not being decremented to 0 in time, therefore does not reply CTS.
■ STA3 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t1 is early than t2, therefore upgrade NAV, the moment t2 that the NAV indicating channel busy state after renewal terminates.
(4) AP does not receive the CTS that STA2 sends in the given time, think that the channel booking of AP and STA2 is unsuccessful, initiate the RTS for STA3 after a certain time, receiver address territory RA in RTS frame is the address of STA3, sending address field TA is the address of AP, and the process after each website receives is as follows:
■ STA1 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t2, then detects NAV, the moment that NAV indicating channel busy state terminates is t3, and t2 is early than t3, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA2 receives this RTS frame, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, and the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, the moment that NAV indicating channel busy state terminates is t1, and t1 is early than t3, therefore upgrade NAV, the moment t3 that the NAV indicating channel busy state after renewal terminates.
■ STA3 receives this RTS frame, resolves this frame and obtains, and this frame is the frame sending to oneself, and this frame is the RTS frame that AP sends, detect secondary NAV, now secondary NAV value is 0, although its this value of this example initial setting is not 0, and during RTS/CTS Frame switch above, the numerical value of secondary NAV upgrades, and indicates longer Channel holding time, but its value is successively decreased in time and now successively decreased 0, therefore after certain time delay, reply CTS, the address of the RA domain identifier AP of CTS.
(5), after STA3 replys CTS, the process after each website receives is as follows:
■ AP receives the CTS that STA3 replys, and namely thinks that the channel booking between AP and STA3 is successful.
■ STA1 can not receive the CTS that STA3 replys, but receive a frame during this period, resolve this frame to obtain, this frame is not the frame sending to oneself, and this frame is not present networks down channel reservation frame, according to content of the present invention, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is b2, detect NAV again, the moment that NAV indicating channel busy state terminates is t3, b2 is later than t3, therefore upgrade NAV, the moment b2 that NAV indicating channel busy state after renewal terminates, simultaneously, upgrade secondary NAV, the moment that the numerical value indicating channel busy state of the secondary NAV after renewal terminates also is b2.
■ STA2 receives the CTS that STA3 replys, resolve this frame to obtain, this frame is not the frame sending to oneself, this frame is the down channel reservation frame of present networks, the moment that the information determination channel busy state of carrying according to this frame duration territory further terminates is t3, then detects NAV, and the moment that NAV indicating channel busy state terminates also is t3, therefore NAV does not do and upgrades, abandon this frame.
AP is only successful with 2 STA channel bookings, and this launches the data that MU-MIMO packet comprises STA1 and STA3.
As can be seen from the above description, present invention achieves following technique effect:
By the present invention, adopt two time variables arranged to carry out virtual carrier detection, solve website and can not reply the whether idle problem of present channel in time, and then reach the effect that website makes the response of replying channel idle at once.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the virtual carrier detection method strengthened, is characterized in that, comprising:
Website uses very first time variable and/or the second time variable to carry out virtual carrier detection, and determine whether to send radio frames according to the result that virtual carrier detects, wherein, described very first time variable comprises the first finish time that indicating channel busy state terminates, and described second time variable comprises the second finish time that indicating channel busy state terminates;
Wherein, described first finish time is the moment the latest that described website is terminated by the channel busy state receiving radio frames acquisition; The moment the latest that the channel busy state that described second finish time, to be described website obtained by the radio frames received from non-present networks terminates.
2. method according to claim 1, it is characterized in that, described website receives specific and after needing the radio frames of described station replies, use described very first time variable and/or described second time variable to carry out virtual carrier detection, and determine to send described radio frames according to the result that described virtual carrier detects.
3. method according to claim 2, is characterized in that, described specific and need the radio frames of described station replies comprise following one of at least: the predetermined radio frames sending address and/or receiver address, the radio frames of predetermined frame type.
4. according to the method in any one of claims 1 to 3, it is characterized in that, according to the result that virtual carrier detects, described website determines whether that the step sending radio frames comprises:
If described second time variable is 0, then described website sends described radio frames; Otherwise described website does not send described radio frames.
5. according to the method in any one of claims 1 to 3, it is characterized in that, according to the result that virtual carrier detects, described website determines whether that the step sending radio frames comprises:
If described very first time variable is 0, then described website sends described radio frames;
If described very first time variable is not 0 and described second time variable is 0, then described website sends described radio frames, otherwise described website does not send described radio frames.
6. according to the method in any one of claims 1 to 3, it is characterized in that, when described website uses described very first time variable to carry out virtual carrier detection, also comprise:
Described website receives a radio frames, and wherein, the receiver address of described radio frames is different from described site address; Channel busy state finish time indicated by the information that described radio frames is carried is later than the first finish time that described indicating channel busy state that described very first time variable comprises terminates;
Described website upgrades described very first time variable, the first finish time indicating channel busy state to terminate in the described very first time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.
7. according to the method in any one of claims 1 to 3, it is characterized in that, when described website uses described second time variable to carry out virtual carrier detection, also comprise:
Described website receives a radio frames, and wherein, the receiver address of described radio frames is different from described site address; The transmission address of described radio frames and the access website address of network associated by described website or different with other site address of network associated by described website; Channel busy state finish time indicated by the information that described radio frames is carried is later than the second finish time that indicating channel busy state that described second time variable comprises terminates;
Described website upgrades described second time variable, the second finish time indicating channel busy state to terminate in described second time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.
8. the virtual carrier detection system strengthened, is arranged in website, it is characterized in that, comprising:
Detecting unit, virtual carrier detection is carried out for using very first time variable and/or the second time variable, wherein, described very first time variable comprises the first finish time that indicating channel busy state terminates, and described second time variable comprises the second finish time that indicating channel busy state terminates;
Processing unit, the result for detecting according to virtual carrier determines whether to send radio frames;
Wherein, described first finish time is the moment the latest that described website is terminated by the channel busy state receiving radio frames acquisition; The moment the latest that the channel busy state that described second finish time, to be described website obtained by the radio frames received from non-present networks terminates.
9. system according to claim 8, is characterized in that, also comprises:
First receiving element, for receiving specific and needing the radio frames of described station replies, and receiving specific and after needing the radio frames of described station replies, notifying that described detecting unit performs and use very first time variable and/or the second time variable carry out the step of virtual carrier detection and notify that described processing unit performs the step that the result detected according to virtual carrier determines whether to send radio frames.
10. system according to claim 8, is characterized in that, described processing unit comprises:
First judging unit, for judging whether described second time variable is 0;
First transmitting element, for when described second time variable is 0, sends described radio frames.
11. systems according to claim 8, is characterized in that, described processing unit comprises:
Second judging unit, for judging whether described very first time variable is 0; And when described very first time variable is not 0, judge whether described second time variable is 0;
Second transmitting element, for when described very first time variable is 0, sends described radio frames; Or, when described very first time variable is not 0 and described second time variable is 0, send described radio frames.
12. systems according to claim 8, is characterized in that, also comprise:
Second receiving element, for when using described very first time variable to carry out virtual carrier detection, receive a radio frames, wherein, the receiver address of described radio frames is different from described site address; Channel busy state finish time indicated by the information that described radio frames is carried is later than the first finish time that described indicating channel busy state that described very first time variable comprises terminates;
First updating block, for upgrading described very first time variable, the first finish time indicating channel busy state to terminate in the described very first time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.
13. systems according to claim 8, is characterized in that, also comprise:
3rd receiving element, for when using described second time variable to carry out virtual carrier detection, receive a radio frames, wherein, the receiver address of described radio frames is different from described site address; The transmission address of described radio frames and the access website address of network associated by described website or different with other site address of network associated by described website; Channel busy state finish time indicated by the information that described radio frames is carried is later than the second finish time that indicating channel busy state that described second time variable comprises terminates;
Second updating block, for upgrading described second time variable, the second finish time indicating channel busy state to terminate in described second time variable after renewal for described in channel busy state finish time indicated by the radio frames that the receives information of carrying.
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| CN1996908A (en) * | 2005-12-31 | 2007-07-11 | 中兴通讯股份有限公司 | Method for ending time update and its state detection of occupied channels in the wireless LAN |
| CN101394626A (en) * | 2007-09-19 | 2009-03-25 | 株式会社Ntt都科摩 | Distributed service differentiating method and device based on WLAN |
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2010
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1996908A (en) * | 2005-12-31 | 2007-07-11 | 中兴通讯股份有限公司 | Method for ending time update and its state detection of occupied channels in the wireless LAN |
| CN101394626A (en) * | 2007-09-19 | 2009-03-25 | 株式会社Ntt都科摩 | Distributed service differentiating method and device based on WLAN |
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