CN102595623A - Multi-frame transmission method and multi-frame transmission system - Google Patents
Multi-frame transmission method and multi-frame transmission system Download PDFInfo
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Abstract
The invention discloses a multi-frame transmission method. The method comprises the following steps that: based on amount and/or length of data to be sent to the current receiving station in the current access queue, a sending station determines the time for occupying a channel to perform frame exchange with the current receiving station; the sending station generates channel reservation time information according to the determined time for occupying the channel to perform frame exchange with the current receiving station; and the sending base station performs frame exchange with the current receiving station according to the generated channel reservation time information. The invention further discloses a multi-frame transmission system. With the method and the system, the channel reservation time of the stations in an OBSS (Object Based Storage System) is reduced, thus, an auditing station can set shorter NAV (Network Allocation Vector) settings, the system throughput of the OBSS is improved, and the high efficiency of each station in the OBSS under the condition of large-bandwidth is ensured.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of multiframe transmission method and system.
Background technology
At present, WLAN (WLAN, Wireless Local Area Networks) fast development, the increasing demand that WLAN is covered increases, and is also increasingly high to the requirement of throughput.In the Institute of Electrical and Electric Engineers industrial specification IEEE802.11 group, successively defined 802.11a, 802.11b; 802.11g etc. the prevailing WLAN technology of series of standards, occurred other task groups subsequently again successively, be devoted to develop the standard that relates to existing 802.11 technological improvements; For example, the 802.11n task groups proposes the requirement of high-throughput (HT, High throughput); Support is up to the data rate of 600Mbps; 802.11ac task groups further proposes the very notion of high-throughput (VHT, Very High throughput), through introducing bigger channel width data rate is risen to 1Gbps.And along with the evolution of 802.11 agreements, the channel width of traditional 20MHz has expanded to 40MHz, 80MHz, 120MHz; Even 160MHz; These big bandwidth are all bound by several 20MHz and are formed, and one of them 20MHz is called main channel, and other 20MHz channels are called auxilliary channel.Wherein, 80MHz can be discontinuous two 40MHz, or two continuous 40MHz, and 160MHz can be discontinuous two 80MHz, or two continuous 80MHz.
802.11 in the agreement, (STA Station) has formed a Basic Service Set (BSS, Basic Service Set) for an access point (AP, Access Point) and a plurality of websites of being associated with AP.802.11 defined two kinds of operator schemes in the agreement: distributed coordination function (DCF; Distributed Coordination Function) and point coordination function (PCF; Point Coordination Function); Also comprise improvement: enhancement mode distributed coordination access function (EDCA to these two kinds of operator schemes; Enhanced Distributed Channel Access) and Hybrid Coordination Function control channel access function (HCCA, Hybrid Coordination Function Controlled Channel Access).Wherein, DCF is the most basic operator scheme, utilizes to have the Carrier Sense Multiple Access mechanism (CSMA/CA, CSMA with Collision Avoidance) that conflict is avoided, and makes a plurality of website sharing wireless channel.EDCA is the enhanced kind of operation pattern, utilizes CSMA/CA mechanism, makes a plurality of different priorities queue sharing wireless channels through reservation transmission opportunity (TXOP, Transmission Opportunity).
During a plurality of wireless site shared channel, the collision detection of the wireless environment very difficulty that becomes, wherein a big problem is exactly hiding website.The example of hiding website in the WLAN is as shown in Figure 1; Website A can send data to website B, and website C also can send data to website B simultaneously, because website C and website A are in outside the other side's the coverage; Website A and website C send data to website B simultaneously, will lead to a conflict.From the angle of website A, website C is a hiding website.
For solving the website problem of hiding; 802.11 agreement has proposed the pseudo channel testing mechanism, promptly through in the frame head of radio frames, comprising reservation channel time information, receives the network allocation vector (NAV that website is provided with local storage that audits of this radio frames; Network Allocation Vector); The value of NAV is set to the maximum of above-mentioned reservation channel time information, in the time period that NAV limited, audits website and can not send data; Thereby avoided the concealed nodes competitive channel, caused collision.For example, as shown in Figure 2, send website A transmitting channel reserve requests (RTS, Request to send) and carry out channel booking; Wherein comprise channel booking temporal information (Duration), receiving station B Return Channel reservation response (CTS, Clear to send) is carried out channel booking and is confirmed; Wherein also comprise Duration, simultaneously, the website C that audits of receiving station B receives the CTS that receiving station B sends; According to Duration wherein, the NAV of self is set, postpone and inserting.
In the TXOP under the EDCA mode, when certain inserts in formation (AC, Access category) and has a plurality of outgoing data frame, can adopt the mode of multiframe transmission (multiple frame transmission) to transmit.When certain AC of an AP had obtained a TXOP, a plurality of outgoing data among this AC possibly be data of giving one or more receiving stations to be sent.At present; For the multiframe transmission course that has a plurality of receiving stations; Send website through with the mutual RTS/CTS of first receiving station be that the AC of current competition TXOP preengages TXOP; Wherein, entrained Duration sends needed time of all outgoing data or maximum TXOP time restriction (TXOP Limit) among the AC among the RTS, and entrained Duration is the difference that entrained Duration and RTS send the spent time among the RTS among the CTS; For n receiving station afterwards; Send website and n receiving station through mutual RTS/CTS subscription time; Wherein, Among the RTS entrained Duration be send among the AC needed time of all outgoing data or TXOPLimit, with send the difference of website to n-1 receiving station transmission spent time of data, entrained Duration is the difference that entrained Duration and RTS send the spent time among this RTS among the CTS; Here; All audit the set NAV of website all be according to self close on the Duration that carries among the CTS that receiving station sends or self and close on and send the Duration that carries among the RTS that website sends and confirm; For example, there is the multiframe transmission course of two receiving stations as shown in Figure 3, like this; The website of auditing for receiving station; The time that its NAV is provided with is longer, cause its receiving station that closes on send accomplish between the website outgoing data alternately after, still be in the state that can not send data.For Fig. 3; Receiving station 1 (STA_1) audit website NAV with regard to be set to from STA_1 send CTS the time be carved into the moment that receiving station 2 (STA_2) sends last acknowledgement frame; Like this; After receiving station 1 was accomplished and sent the data interaction between the website, the website of auditing of receiving station 1 (STA_1) still was in the state that can not send data.If it is non-vanishing to audit being provided with of website NAV, just can't competitive channel, thus reduced transmission opportunity, have influence on the throughput of OBSS website.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of multiframe transmission method and system, to solve the NAV that audits website in the multiframe transmission course problem that the time causes reducing transmission opportunity than length, influences OBSS station throughput is set.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of multiframe transmission method; Said method comprises: send website according to the quantity and/or the length that are sent to the data of current receiving station in the current access formation, confirm to carry out the time that the frame exchange needs busy channel with said current receiving station; According to determined, carry out time of frame exchange needs busy channel, said dispatching station dot generation channel booking temporal information with said current receiving station; Said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station.
In such scheme; Said according to determined, carry out time of frame exchange needs busy channel with said current receiving station; Dispatching station dot generation channel booking temporal information; Be specially: said dispatching station names a person for a particular job to the finish time of said current receiving station transmitting channel reserve requests (RTS) or to the finish time of said current first Frame of receiving station transmission, as the initial moment of said channel booking temporal information; With determined, and the time interval of said current receiving station time of carrying out the frame exchange and needing busy channel between breasting the tape constantly as the initial moment of said channel booking temporal information; Obtain the terminal point moment of said channel booking temporal information, generate said channel booking temporal information.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station, be specially: said transmission website is provided with local channel reservation timer according to the channel booking temporal information that is generated; And in the set times prior of said local channel reservation timer arrival, and carry out the frame exchange between the said current receiving station.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station, comprising: said transmission website sends to current receiving station and carries the RTS that generates the channel booking temporal information to some extent, and current receiving station receives said RTS; Upgrade said channel booking temporal information, and carry the channel booking response (CTS) of upgrading the channel booking temporal information to some extent to said transmission website transmission.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station; Also comprise: the website of auditing of said transmission website receives the RTS that said transmission website sends, and according to the channel booking temporal information that said RTS carries, self networks allocation vector (NAV) is set.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station; Also comprise: the website of auditing of said current receiving station receives the CTS that current receiving station sends, and according to the channel booking temporal information of carrying among the said CTS, the NAV of self is set.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station, comprising: said transmission website sends to current receiving station and carries first Frame that generates the channel booking temporal information to some extent, and current receiving station receives said first Frame; Upgrade said channel booking temporal information, and carry first acknowledgement frame that upgrades the channel booking temporal information to some extent to said transmission website transmission.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station; Also comprise: the website of auditing of said transmission website receives first Frame that said transmission website sends, and according to the channel booking temporal information that said first Frame carries, the NAV of self is set.
In such scheme; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station; Also comprise: the website of auditing of said current receiving station receives first acknowledgement frame that current receiving station sends, and according to the channel booking temporal information of carrying in said first acknowledgement frame, the NAV of self is set.
The present invention also provides a kind of multiframe transmission system; Said system comprises: send website and at least one receiving station, carry out the multiframe transmission between said transmission website and at least one receiving station, wherein; Send website and comprise confirmation unit, generation unit and crosspoint; Confirmation unit is used for being sent to according to current access formation the quantity and/length of the data of said receiving station, confirms to carry out the time that the frame exchange needs busy channel with said receiving station; Generation unit, be used for confirming according to said definite unit, carry out time of frame exchange needs busy channel, said dispatching station dot generation channel booking temporal information with said receiving station; Crosspoint is used for the channel booking temporal information according to said generation unit generation, and carries out the frame exchange between the said receiving station.
In such scheme; Said generation unit; Specifically be used for, send the finish time of RTS or send website to said receiving station to the finish time that said receiving station sends first Frame, as the initial moment of said channel booking temporal information with sending website; Confirm with said definite unit, carry out the frame exchange with said receiving station and need the time of busy channel to breast the tape the time interval between the moment as the initial moment of channel booking temporal information; Obtain the terminal point moment of channel booking temporal information, generate the channel booking temporal information.
In such scheme, said crosspoint specifically is used for; Channel booking temporal information according to said generation unit generation; Local channel reservation timer is set, and arrives set times prior, and carry out the frame exchange between the said receiving station at said local channel reservation timer.
In such scheme, said system also comprises: send the website of auditing of website, wherein, said crosspoint also is used for, and sends to said receiving station and carries RTS or first Frame that generates the channel booking temporal information to some extent; Send the website of auditing of website, be used to receive RTS or first Frame that the crosspoint of said transmission website sends, and, the NAV of self is set according to the channel booking temporal information that said RTS or first Frame carry.
In such scheme; Said system also comprises: receiving station audit website, wherein, said receiving station; Also be used for; Receive said RTS or first Frame of the crosspoint transmission of said transmission website, upgrade said channel booking temporal information, and carry CTS or first acknowledgement frame that upgrades the channel booking temporal information to some extent to said transmission website transmission; Receiving station audit website, be used to receive CTS or first acknowledgement frame that said receiving station sends, and, the NAV of self be set according to the channel booking temporal information that said CTS or first acknowledgement frame carry.
Multiframe transmission method provided by the present invention and system; Send data volume and/or the length of website according to the packet that belongs to a receiving station in the access formation that obtains transmission opportunity; Confirm to carry out the channel time that the frame clearing house takies, and carry out channel booking, not only realized being in the transmission opportunity the big bandwidth for transmission data of one or more receiving station utilizations with this receiving station; Reduced the channel booking time of website among the OBSS simultaneously; Make that auditing website can be provided with short NAV and be provided with, thereby improved the throughput of system of OBSS, and guaranteed under the big bandwidth situation the efficient performance of each website among the OBSS.
Description of drawings
Fig. 1 is for hiding the website sketch map;
Fig. 2 is the sketch map that sends mutual RTS/CTS between website and the receiving station in the prior art;
Fig. 3 is the sketch map of multiframe transmission in the prior art;
Fig. 4 is the realization flow sketch map of multiframe transmission method of the present invention;
Fig. 5 is the multiframe transmission sketch map of the embodiment of the invention one
Fig. 6 is the multiframe transmission sketch map of the embodiment of the invention two.
Embodiment
Basic thought of the present invention is: in the wireless network under the big bandwidth situation of multichannel; Send website and carry out the multiframe transmission in a transmission opportunity and between a plurality of receiving station; After sending certain access formation acquisition transmission opportunity of website, in this transmission opportunity, send website based on length and/or quantity to each receiving station data to be sent; Confirming needs the time of busy channel to each receiving station transmission data, and carries out the multiframe transmission in the determined time and between each receiving station.Multiframe transmission plan of the present invention can be used in the wireless network of following channel width: 20MHz, 40MHz, 80MHz, 120MHz, 160MHz and other are bigger channel width of unit etc. with 20MHz.
Multiframe transmission method of the present invention with reference to shown in Figure 4, mainly may further comprise the steps:
Step 401: send website according to the quantity and/or the length that are sent to the data of current receiving station in the current access formation, confirm to carry out the time that the frame exchange needs busy channel with said current receiving station;
Step 402: according to determined, carry out time of frame exchange needs busy channel, said dispatching station dot generation channel booking temporal information with said current receiving station;
Step 403: said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station.
Wherein, Step 402 specifically can be: said dispatching station names a person for a particular job to the finish time of said current receiving station transmitting channel reserve requests (RTS) or to the finish time of said current first Frame of receiving station transmission, as the initial moment of said channel booking temporal information; With determined, and the time interval of said current receiving station time of carrying out the frame exchange and needing busy channel between breasting the tape constantly as the initial moment of said channel booking temporal information; Obtain the terminal point moment of said channel booking temporal information, generate said channel booking temporal information.
Here, send website, calculate to the finish time of said current receiving station transmitting channel reserve requests (RTS) or the finish time of sending first Frame to said current receiving station according to current time.Concrete computational methods are this area common technology means, repeat no more at this.
Wherein, Step 403 specifically can for: said transmission website is according to the channel booking temporal information that is generated; Local channel reservation timer is set, and arrives set times prior, and carry out the frame exchange between the said current receiving station at said local channel reservation timer.
Can comprise in step 403: said transmission website sends to current receiving station and carries the RTS that generates the channel booking temporal information to some extent; Current receiving station receives said RTS; Upgrade said channel booking temporal information, and carry the CTS that upgrades the channel booking temporal information to some extent to said transmission website transmission.
Here; Said current receiving station upgrades said channel booking temporal information; Specifically: current receiving station is updated to the finish time of sending said CTS with the initial moment of the entrained channel booking temporal information of said RTS, keeps the terminal juncture of said channel booking temporal information constant.
Here, step 403 also comprises: the website of auditing of said transmission website receives the RTS that said transmission website sends, and according to the channel booking temporal information that said RTS carries, the NAV of self is set.
Here, step 403 can also comprise: the website of auditing of said current receiving station receives the CTS that current receiving station sends, and according to the channel booking temporal information of carrying among the said CTS, the NAV of self is set.
Perhaps; Step 403 can also comprise: said transmission website sends to current receiving station and carries first Frame that generates the channel booking temporal information to some extent; Current receiving station receives said first Frame; Upgrade said channel booking temporal information, and carry first acknowledgement frame that upgrades the channel booking temporal information to some extent to said transmission website transmission.
Here, step 403 also comprises: the website of auditing of said transmission website receives first Frame that said transmission website sends, and according to the channel booking temporal information that said first Frame carries, the NAV of self is set.
Here, step 403 can also comprise: the website of auditing of said current receiving station receives first acknowledgement frame that current receiving station sends, and according to the channel booking temporal information of carrying in said first acknowledgement frame, the NAV of self is set.
Wherein, In step 403, send the frame exchange of a Frame of every completion between website and the current receiving station after, judge that local channel preengages the frame of the next Frame that whether enough is used to accomplish this receiving station the remaining time of timer and exchange; If; Then proceed the frame exchange of next Frame, otherwise the frame exchange of sending between website and the current receiving station finishes.
Here; In the step 401; Specifically comprise: send website according to the quantity of the data that are sent to current receiving station in the current access formation and/length, obtain sending the time that all data of being sent to said current receiving station in the current access formation need, verify whether the resulting time is not more than the residue time limit of current transmission opportunity to current receiving station; If, then with the resulting time as carrying out the time that the frame exchange needs busy channel with said current receiving station; If not, then with residue time limit of current transmission opportunity as carrying out the time that the frame exchange needs busy channel with said current receiving station.
Here, the residue time limit of current transmission opportunity be the maximum time limit of current transmission opportunity, with send that frame transmits the difference of spent time between website and current receiving station each receiving station before.
In the practical application; If current receiving station is the first receiving station of current a plurality of receiving stations; Verify then whether the resulting time is not more than the maximum time limit of current transmission opportunity; If, then with the resulting time as carrying out the time that the frame exchange needs busy channel with said current receiving station; If not, then with maximum time limit of current transmission opportunity as carrying out the time that the frame exchange needs busy channel with said current receiving station.
Among the present invention; Send when carrying out the multiframe transmission between website and a plurality of receiving station; It is identical with above-mentioned process shown in Figure 4 with the process that any receiving station carries out the frame exchange to send website; Be fewer than complete frame exchange of completion up to the remaining time in the pairing maximum transmitted chance time limit of access formation that obtains current transmission opportunity, all data to be sent have all sent to corresponding receiving station in the perhaps said access formation, and current transmission opportunity finishes.
Accordingly, the present invention also provides a kind of multiframe transmission system, and this system mainly comprises: send website and at least one receiving station; Carry out the multiframe transmission between said transmission website and at least one receiving station; Wherein, send website and comprise confirmation unit, generation unit and crosspoint, confirmation unit; Be used for being sent to the quantity and/length of the data of said receiving station, confirm to carry out the time that the frame exchange needs busy channel with said receiving station according to current access formation; Generation unit, be used for confirming according to said definite unit, carry out time of frame exchange needs busy channel, said dispatching station dot generation channel booking temporal information with said receiving station; Crosspoint is used for the channel booking temporal information according to said generation unit generation, and carries out the frame exchange between the said receiving station.
Wherein, said generation unit specifically is used for, and sends the finish time of RTS or sends website to the finish time that said receiving station sends first Frame, as the initial moment of said channel booking temporal information to said receiving station sending website; Confirm with said definite unit, carry out the frame exchange with said receiving station and need the time of busy channel to breast the tape the time interval between the moment as the initial moment of channel booking temporal information; Obtain the terminal point moment of channel booking temporal information, generate the channel booking temporal information.
Wherein, said crosspoint specifically is used for; Channel booking temporal information according to said generation unit generation; Local channel reservation timer is set, and arrives set times prior, and carry out the frame exchange between the said receiving station at said local channel reservation timer.
Here, said system can also comprise: send the website of auditing of website, wherein, said crosspoint also is used for, and sends to said receiving station and carries RTS or first Frame that generates the channel booking temporal information to some extent; Send the website of auditing of website, be used to receive RTS or first Frame that the crosspoint of said transmission website sends, and, the NAV of self is set according to the channel booking temporal information that said RTS or first Frame carry.
Here; Said system can also comprise: receiving station audit website, wherein, said receiving station; Also be used for; Receive said RTS or first Frame of the crosspoint transmission of said transmission website, upgrade said channel booking temporal information, and carry CTS or first acknowledgement frame that upgrades the channel booking temporal information to some extent to said transmission website transmission; Receiving station audit website, be used to receive CTS or first acknowledgement frame that said receiving station sends, and, the NAV of self be set according to the channel booking temporal information that said CTS or first acknowledgement frame carry.
Embodiment one
The multiframe transmission course of present embodiment is as shown in Figure 5; In the present embodiment; In the access formation of AP a plurality of outgoing data are arranged, and receiver address is two websites: receiving station 1 (STA_1) and receiving station 2 (STA_2), this TXOP limit that inserts formation is non-vanishing; Therefore, AP can obtain transmission opportunity and carry out the multiframe transmission for this inserts formation.AP is this access formation contention transmission opportunities according to the competitive Principle that obtains transmission opportunity under the EDCA pattern, and the data a plurality of to be sent that will insert in the formation send to STA_1 and STA_2, and idiographic flow is following:
Steps A: at first; AP is according to the quantity and/or the length of the data that are sent to STA_1 among the current AC, under the restriction of satisfying TXOP limit, confirms to carry out the time that the frame exchange needs busy channel between self and the STA_1; And through with the mutual RTS/CTS of STA_1, the reservation channel.
Particularly; AP is according to the quantity and/or the length of the data that are sent to STA_1 among the current AC, calculate and STA_1 between carry out the frame clearing house and take time, and verify that the resulting time is whether less than the TXOP limit of current transmission opportunity; If; Then and carry out between the STA_1 frame clearing house take time confirm as and STA_1 between carry out the time that the frame exchange needs busy channel, otherwise, with said TXOP limit confirm as and STA_1 between carry out the time that the frame exchange needs busy channel.In the present embodiment; The data that are sent to STA_1 among the AC that AP obtains, current send to the TXOP limit of STA_1 required time less than current transmission opportunity, with carry out between AP and the STA_1 frame clearing house take time confirm as and STA_1 between carry out the time that the frame exchange needs busy channel.
AP is after confirming that carrying out the frame exchange between self and the STA_1 needs the time of busy channel; Send RTS to STA_1; Carry channel booking temporal information (Duration), here, among the RTS entrained Duration according to AP to STA_1 send RTS the finish time and confirm that the time of carrying out frame exchange needs busy channel between AP and the STA_1 obtains; As shown in Figure 5; In the present embodiment, the Duration that carries among this RTS is specially AP and sends the time between finish time of sending acknowledgement frame the finish time to STA_1 of RTS to STA_1, comprises following frame exchange between the affirmation frame end that finishes to send to STA1 from RTS: the interval of CTS, Frame, acknowledgement frame and each interframe; Wherein CTS and acknowledgement frame all are control frames; Its content is fixed, its send required time can be fix or through calculating, interFrameGap is also fixed; After STA_1 receives the RTS of AP transmission; Upgrade Duration, to AP feedback CTS, and in CTS, carry upgrade the Duration that obtains; Here, entrained Duration is that STA_1 sends the time between finish time of sending acknowledgement frame the finish time to STA_1 of CTS among the CTS; AP decodes to CTS after receiving the CTS of STA_1 feedback, decodes successfully, then successfully preengages channel, and this access formation has promptly obtained current transmission opportunity, otherwise decoding is unsuccessful, and this access formation does not just have to obtain current transmission opportunity, and this flow process finishes.
Here; AP is according to the quantity and/or the length of the data that are sent to STA_1 among the current AC; Calculate and carry out the process that the frame clearing house takes time between self and the STA_1 and can be: AP confirms the bit number of outgoing data according to the number of the outgoing data bag that is sent to STA_1 among the current AC and the bit number that packet comprised, and according to the transmission parameter of current transmission data; Like needed symbolic numbers of definite outgoing data such as modulation coding mode, transmission bandwidths; A symbolic number takies a regular time, so, just can confirm to carry out between self and the STA_1 time of frame clearing house need according to symbolic number.This process is this area common technology means, repeats no more here.
Step B:AP according to the Duration that carries among the RTS, is provided with local channel reservation timer (TXNAV timer) after having sent RTS to STA_1;
The website of auditing of step C:AP receives the RTS that AP sends, and said RTS is decoded, and the NAV of self is set according to the Duration that carries among the RTS; The website of auditing of STA_1 receives the CTS that STA_1 sends, and to after the CTS that the receives decoding, and the Duration that obtains according to decoding is provided with the NAV of self.
Step D:AP accomplishes the frame turnaround sequence of the data that are sent to STA_1 among the current AC with STA_1 in the time that TXNAV timer is limited.
Here, carry out in the frame exchange process at AP and STA_1, STA_1 does not have successful decoded data, and perhaps AP does not receive acknowledgement frame, thinks that then data send failure.Under the situation that does not have to finish at current TXNAV timer; If enough carry out the re-transmission of this transmission failed data frame remaining time at TXNAV timer; Then can retransmit between AP and the STA_1 and send failed data frame and acknowledgement frame thereof; Otherwise AP directly carries out step e, the frame exchange between beginning and the next receiving station STA_2.
Here, AP accomplishes corresponding frame turnaround sequence after can a plurality of outgoing data unit of corresponding STA_1 among the current AC being carried out polymerization through an aggregation protocol data cell (A-MPDU, Aggregated MPDU).
Step e: when be not enough to accomplish next complete frame turnaround sequence with STA_1 the remaining time of the TXNAV of AP timer; When perhaps the frame turnaround sequence between AP and STA_1 has been accomplished; If in the time of can guaranteeing to accomplish the mutual and complete frame turnaround sequence of RTS/CTS with next receiving station STA_2 the remaining time of current TXOP limit at least; AP can wait for an interFrameGap (SIFS), starts the transfer of data for next receiving station STA_2.
Step F: AP is according to quantity and/or length of giving the data of STA_2 to be sent among the AC, under the restriction of satisfying TXOP limit, confirm and STA_2 between carry out the time that frame exchange needs busy channel, and through with the mutual RTS/CTS of STA_2, preengage channel.
Here, the concrete implementation procedure of this step is identical with the concrete implementation procedure of steps A, and different is; Here; Do not need contention transmission opportunities again, only need a reservation channel successfully to get final product, and carry out frame clearing house employable maximum time between AP and the STA_2; Can not surpass TXOP limit and deduct the already used time of previous receiving station, repeat no more at this.
Here, entrained Duration is specially AP and sends the time between finish time of sending acknowledgement frame the finish time to STA_2 of RTS to STA_2 among the RTS; Entrained Duration is that STA_2 sends the time between finish time of sending acknowledgement frame the finish time to STA_2 of CTS among the CTS.
Step G:AP according to the Duration among this RTS, is provided with TXNAV timer after having sent RTS to STA_2;
The website of auditing of step H:AP receives the RTS that AP sends once more, and said RTS is decoded, and resets the NAV of self according to the Duration that carries among the RTS; The website of auditing of STA_2 receives the CTS that STA_2 sends, and to after the CTS that the receives decoding, and the Duration that obtains according to decoding is provided with the NAV of self.
Step I:AP accomplishes the frame turnaround sequence of the data that are sent to STA_2 among the current AC with STA_2 in the time that TXNAV timer is limited.
Here, carry out in the frame exchange process at AP and STA_2, STA_1 does not have successful decoded data, and perhaps AP does not receive acknowledgement frame, thinks that then data send failure.Under the situation that does not have to finish at current TXNAV timer; If enough carry out the re-transmission of this transmission failed data frame remaining time at TXNAV timer, then can retransmit between AP and the STA_2 and send failed data frame and acknowledgement frame thereof, otherwise; AP directly carries out step J, finishes current transmission.
Step J:AP verifies that current TXOP limit is to perhaps being not enough to accomplish next complete frame turnaround sequence, the current end of transmission.
Need to prove that in the above-mentioned steps, steps A, step B, step C carry out simultaneously, step F, step G, step H also carry out simultaneously.
Embodiment two
Present embodiment is identical with embodiment one scene, and is inequality on the concrete implementation procedure of multiframe transmission, and with reference to shown in Figure 6, the idiographic flow of present embodiment is following:
Steps A: basic identical with the steps A among the embodiment one; Different is; AP confirm and STA_1 between carry out frame exchange and need the time of busy channel after, directly to STA_1 transmission Frame, and in the Frame that is sent, carry Duration; After receiving the acknowledgement frame that STA_1 returns, successfully preengage channel;
Particularly, AP sends Frame 1 to STA_1, carries Duration in the Frame 1, and this Duration is specially AP and sends the time between finish time of sending last acknowledgement frame the finish time to STA_1 of Frame 1 to STA_1; STA_1 receives the Frame 1 that AP sends; After success is decoded; To AP send acknowledgement frame (ACK, Ackowledgement), the Duration that carries in this acknowledgement frame is specially STA_1 and sends the time between finish time of sending last acknowledgement frame the finish time to STA_1 of current acknowledgement frame; AP receives acknowledgement frame and the successfully decoding that STA_1 sends, and has promptly successfully preengage channel, and this access formation has promptly obtained current transmission opportunity.Afterwards; AP continues to send Frame to STA_1; Accordingly, STA_1 receives Frame and returns acknowledgement frame to AP, wherein; Each Frame and acknowledgement frame all carry Duration, and entrained Duration is specially the time between the finish time of sending last acknowledgement frame the finish time to STA_1 of sending current data frame or acknowledgement frame.
Step B:AP is after having sent first Frame and being Frame 1 to STA_1; According to the Duration that carries in the Frame 1; TXNAV timer is set, and AP accomplishes the frame turnaround sequence of the data that are sent to STA_2 among the current AC with STA_2 in the time that TXNAV timer is limited.
The website of auditing of step C:AP receives after first Frame that AP sends is Frame 1, and the NAV of self is set according to the Duration that carries in the Frame 1; After the auditing website and receive first acknowledgement frame that STA_1 sends of STA_1, the NAV of self is set according to the Duration that wherein carries.
Step D: when be not enough to accomplish next complete frame turnaround sequence with STA_1 the remaining time of the TXNAV of AP timer; When perhaps the frame turnaround sequence between AP and STA_1 has been accomplished; If in the time of can guaranteeing to accomplish the mutual and complete frame turnaround sequence of RTS/CTS with next receiving station STA_2 the remaining time of current TXOP limit at least; AP can wait for an interFrameGap (SIFS), starts the transfer of data for next receiving station STA_2.
Step e: AP is according to quantity and/or length of giving the data of STA_2 to be sent among the AC; Under the restriction of satisfying TXOP limit; Confirm and STA_2 between carry out the time that frame exchange needs busy channel, and through with STA_2 exchange data frames/acknowledgement frame, preengage channel.
Here, the concrete implementation procedure of this step is identical with the concrete implementation procedure of steps A of present embodiment, and different is; Here; Do not need contention transmission opportunities again, only need a reservation channel successfully to get final product, and carry out frame clearing house employable maximum time between AP and the STA_2; Can not surpass TXOP limit and deduct the already used time of previous receiving station, repeat no more at this.
Here, entrained Duration is specially AP and sends the time between finish time of sending last acknowledgement frame the finish time to STA_2 of Frame 3 to STA_2 in the Frame 3; The Duration that the acknowledgement frame that STA_2 sends in response to Frame 3 carries is that STA_2 sends the time between finish time of sending last acknowledgement frame the finish time to STA_2 of this acknowledgement frame.
Step F: AP is after having sent first Frame and being Frame 3 to STA_2; According to the Duration in this Frame 3; Reset TXNAV timer, AP accomplishes the frame turnaround sequence of the data that are sent to STA_2 among the current AC with STA_2 in the time that TXNAV timer is limited.
The website of auditing of step G:AP receives after first Frame that AP sends is Frame 3, and the NAV of self is set according to the Duration that carries in the Frame 3; After the auditing website and receive first acknowledgement frame that STA_2 sends of STA_2, the NAV of self is set according to the Duration that wherein carries.
Step H:AP verifies that current TXOP limit is to perhaps being not enough to accomplish next complete frame turnaround sequence, the current end of transmission.
Need to prove that in the above-mentioned steps, steps A, step B, step C carry out simultaneously, step e, step F, step G also carry out simultaneously.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a multiframe transmission method is characterized in that, said method comprises:
Send website according to the quantity and/or the length that are sent to the data of current receiving station in the current access formation, confirm to carry out the time that the frame exchange needs busy channel with said current receiving station;
According to determined, carry out time of frame exchange needs busy channel, said dispatching station dot generation channel booking temporal information with said current receiving station;
Said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station.
2. multiframe transmission method according to claim 1 is characterized in that, said according to determined, carry out time of frame exchange needs busy channel with said current receiving station, dispatching station dot generation channel booking temporal information is specially:
Said dispatching station names a person for a particular job to the finish time of said current receiving station transmitting channel reserve requests (RTS) or to the finish time of said current first Frame of receiving station transmission, as the initial moment of said channel booking temporal information;
With determined, and the time interval of said current receiving station time of carrying out the frame exchange and needing busy channel between breasting the tape constantly as the initial moment of said channel booking temporal information; Obtain the terminal point moment of said channel booking temporal information, generate said channel booking temporal information.
3. multiframe transmission method according to claim 1 is characterized in that, said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station, is specially:
Said transmission website is provided with local channel reservation timer according to the channel booking temporal information that is generated, and arrives set times prior at said local channel reservation timer, and carries out the frame exchange between the said current receiving station.
4. according to each described multiframe transmission method of claim 1 to 3; It is characterized in that; Said transmission website is according to the channel booking temporal information that is generated; And carry out the frame exchange between the said current receiving station, comprising: said transmission website sends to current receiving station and carries the RTS that generates the channel booking temporal information to some extent, and current receiving station receives said RTS; Upgrade said channel booking temporal information, and carry the channel booking response (CTS) of upgrading the channel booking temporal information to some extent to said transmission website transmission.
5. multiframe transmission method according to claim 4 is characterized in that, said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station, also comprises:
The website of auditing of said transmission website receives the RTS that said transmission website sends, and according to the channel booking temporal information that said RTS carries, self networks allocation vector (NAV) is set.
6. multiframe transmission method according to claim 4 is characterized in that, said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station, also comprises:
The website of auditing of said current receiving station receives the CTS that current receiving station sends, and according to the channel booking temporal information of carrying among the said CTS, the NAV of self is set.
7. according to each described multiframe transmission method of claim 1 to 3, it is characterized in that said transmission website is according to the channel booking temporal information that is generated, and carry out the frame exchange between the said current receiving station, comprising:
Said transmission website sends to current receiving station and carries first Frame that generates the channel booking temporal information to some extent; Current receiving station receives said first Frame; Upgrade said channel booking temporal information, and carry first acknowledgement frame that upgrades the channel booking temporal information to some extent to said transmission website transmission.
8. multiframe transmission method according to claim 7; It is characterized in that; Said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station, and also comprise: the website of auditing of said transmission website receives first Frame that said transmission website sends; And, the NAV of self is set according to the channel booking temporal information that said first Frame carries.
9. multiframe transmission method according to claim 7; It is characterized in that; Said transmission website is according to the channel booking temporal information that is generated, and carries out the frame exchange between the said current receiving station, and also comprise: the website of auditing of said current receiving station receives first acknowledgement frame that current receiving station sends; And, the NAV of self is set according to the channel booking temporal information of carrying in said first acknowledgement frame.
10. a multiframe transmission system is characterized in that, said system comprises: send website and at least one receiving station; Carry out the multiframe transmission between said transmission website and at least one receiving station; Wherein, send website and comprise confirmation unit, generation unit and crosspoint
Confirmation unit is used for being sent to according to current access formation the quantity and/length of the data of said receiving station, confirms to carry out the time that the frame exchange needs busy channel with said receiving station;
Generation unit, be used for confirming according to said definite unit, carry out time of frame exchange needs busy channel, said dispatching station dot generation channel booking temporal information with said receiving station;
Crosspoint is used for the channel booking temporal information according to said generation unit generation, and carries out the frame exchange between the said receiving station.
11. multiframe transmission system according to claim 10; It is characterized in that; Said generation unit; Specifically be used for, send the finish time of RTS or send website to said receiving station to the finish time that said receiving station sends first Frame, as the initial moment of said channel booking temporal information with sending website; Confirm with said definite unit, carry out the frame exchange with said receiving station and need the time of busy channel to breast the tape the time interval between the moment as the initial moment of channel booking temporal information; Obtain the terminal point moment of channel booking temporal information, generate the channel booking temporal information.
12. multiframe transmission system according to claim 10; It is characterized in that said crosspoint specifically is used for; Channel booking temporal information according to said generation unit generation; Local channel reservation timer is set, and arrives set times prior, and carry out the frame exchange between the said receiving station at said local channel reservation timer.
13. according to each described multiframe transmission system of claim 10 to 12; It is characterized in that; Said system also comprises: send the website of auditing of website, wherein, said crosspoint; Also be used for, send to said receiving station and carry RTS or first Frame that generates the channel booking temporal information to some extent; Send the website of auditing of website, be used to receive RTS or first Frame that the crosspoint of said transmission website sends, and, the NAV of self is set according to the channel booking temporal information that said RTS or first Frame carry.
14. multiframe transmission system according to claim 13 is characterized in that, said system also comprises: receiving station audit website, wherein,
Said receiving station; Also be used for; Receive said RTS or first Frame of the crosspoint transmission of said transmission website, upgrade said channel booking temporal information, and carry CTS or first acknowledgement frame that upgrades the channel booking temporal information to some extent to said transmission website transmission;
Receiving station audit website, be used to receive CTS or first acknowledgement frame that said receiving station sends, and, the NAV of self be set according to the channel booking temporal information that said CTS or first acknowledgement frame carry.
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| CN201110007156.9A CN102595623B (en) | 2011-01-13 | A kind of many frame transmission methods and system |
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| CN201110007156.9A CN102595623B (en) | 2011-01-13 | A kind of many frame transmission methods and system |
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| CN102595623A true CN102595623A (en) | 2012-07-18 |
| CN102595623B CN102595623B (en) | 2016-12-14 |
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