CN102387004A - Counting method and system for multiuser multiple-input and multiple-output data retransmission - Google Patents
Counting method and system for multiuser multiple-input and multiple-output data retransmission Download PDFInfo
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Abstract
The invention discloses a counting method and system for multiuser multiple-input and multiple-output data retransmission. The method comprises the following steps: sending a sending request frame corresponding to multiuser multiple-input and multiple-output data to be sent only to a master user or simultaneously to the master user and a slave user by an access point; when a sending confirmation frame replayed by the master user is not received within preset time, adding a short retransmission counter value corresponding to the data to be sent of the master user; and keeping a short retransmission counter value corresponding to the data to be sent of the slave user constant. By aiming at the application situation for a wireless local area network (WLAN) to use the multiuser multiple-input and multiple-output (MU-MIMO) technology, the invention provides a solution for counting the MU-MIMO data retransmission, the MU-MIMO data to be sent is determined to be the master user and the slave user, retransmission counting is carried out for the master user only when clear to send (CTS) responded by the master user is not received within the preset time, and the slave user is not counted, system performance is improved, and time delay caused by data retransmission in the system can be reduced.
Description
Technical field
Relate generally to wireless communication technology of the present invention specifically, relates in particular to multi-user's multiple input multiple output data retransmits in the WLAN (Wireless Local Area Network is called for short WLAN) method of counting and system.
Background technology
At cellular system Long Term Evolution (Long Term Evolution for example; Abbreviation LTE) in the system; Utilize space multiplexing technique to realize multi-user's multiple-input and multiple-output (Multi-User Multiple Input Multiple Output of multi-user's transmission; Abbreviation MU-MIMO) technology can greatly improve the spectrum efficiency of system; All data of a plurality of users or partial data adopt identical frequency to send with the mode that sky divides simultaneously, and different users' retransmission processes is separate, and in case wherein certain user data make mistakes and all will retransmit or abandon.
At present, the IEEE802.11 series standard is only supported single user's multiple-input and multiple-output (Single User Multiple Input Multiple Output is called for short SU-MIMO) technology.In the IEEE802.11 standard; Existence is based on distributed coordination and two kinds of scheduling methods of coordination; Wherein typically comprise distributed coordination function (Distributed Coordination Function is called for short DCF) and Hybrid Coordination Function, under the distributed coordination scheduling method; Send transmission request (the Request to Send of outgoing data through transmitting terminal; Be called for short RTS) frame, return transmission affirmation (Clear to Send is called for short CTS) frame and preengage the medium right to occupation of unique user data to be sent after receiving terminal is received.If reservation is unsuccessful, usually explanation bump or channel quality bad, then need do retransmission process.
IEEE 802.11ac will support the transmission of multi-user's multiple-input and multiple-output as the improvement version of 802.11 agreements; So just need preengage the medium right to occupation of a plurality of users data to be sent through RTS and CTS; Need consider also simultaneously and the compatibility of SU-MIMO therefore how handling the retransmission count that MU-MIMO sends among the WLAN is the technical issues that need to address.
Summary of the invention
The technical problem that the present invention will solve provides method of counting and the system that a kind of multi-user's multiple input multiple output data retransmits, and improves systematic function.
In order to solve the problems of the technologies described above; The method of counting that the present invention provides a kind of multi-user's multiple input multiple output data to retransmit; Comprise: access point is only to main user or simultaneously to main user with from user's transmission transmission claim frame corresponding with multi-user's multiple input multiple output data to be sent; When in Preset Time, not receiving the transmission acknowledgement frame of main user's answer; Increase the value that the short weight corresponding with main user's outgoing data passes counter, keep constant with the value that passes counter from the corresponding short weight of user's outgoing data.
Further, said method can also have following characteristics:
Said main user's number is one when above; Said access point sends said transmission claim frame to all main users; After in Preset Time, receiving the transmission acknowledgement frame of part master user answer; Increase the value that the corresponding short weight of outgoing data of not receiving the main user who sends acknowledgement frame passes counter, it is constant that the short weight that the main user's that the transmission acknowledgement frame that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
Further, said method can also have following characteristics:
Said access point is received the transmission acknowledgement frame that all main users reply in said Preset Time after, send with the mode of multi-user's multiple-input and multiple-output with main user's outgoing data with from user's outgoing data; Said access point is received the transmission acknowledgement frame that part master user replys in said Preset Time after, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
Further, said method can also have following characteristics:
Access point is confirmed main user and is comprised from user's method: the data to be sent of each website of managing to said access point; Select X the first-selected user data that satisfies multi-user's multiple-input and multiple-output matching request successively and select user data for use Y time according to the dispatching priority order from high to low of data; All select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user, select for use the family as from the user other times than other.
Further, said method can also have following characteristics:
The dispatching priority of data is to take all factors into consideration comprehensive parameters one or more in the following parameter: the time delay grade of the grade of service of data, the precedence in the data queue, data.
Further, said method can also have following characteristics:
The access point indication that whether middle increase need reply CTS in the said transmission claim frame that sends receives this user who sends claim frame and whether replys the transmission acknowledgement frame according to this indication decision.
In order to solve the problems of the technologies described above, the number system that the present invention also provides a kind of multi-user's multiple input multiple output data to retransmit comprises access point; Said access point; Be used for only to main user or simultaneously to main user with from user's transmission transmission claim frame corresponding with multi-user's multiple input multiple output data to be sent; When in Preset Time, not receiving the transmission acknowledgement frame of main user's answer; Increase the value that the short weight corresponding with main user's outgoing data passes counter, keep constant with the value that passes counter from the corresponding short weight of user's outgoing data.
Further, said system can also have following characteristics:
Said access point; Also be used for number said main user and be one when above; Send said transmission claim frame to all main users; After in Preset Time, receiving the transmission acknowledgement frame of part master user answer, increase the value that the corresponding short weight of outgoing data of not receiving the main user who sends acknowledgement frame passes counter, it is constant that the short weight that the main user's that the transmission acknowledgement frame that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
Further, said system can also have following characteristics:
Said access point, also be used in said Preset Time, receiving the transmission acknowledgement frame that all main users reply after, send with the mode of multi-user's multiple-input and multiple-output with main user's outgoing data with from user's outgoing data; After also being used in said Preset Time, receiving the transmission acknowledgement frame that part master user replys, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
Further, said system can also have following characteristics:
Also comprise user's determination module in the said access point; Said user's determination module; The data to be sent of each website that is used for managing to said access point; Select X the first-selected user data that satisfies multi-user's multiple-input and multiple-output matching request successively and select user data for use Y time according to the dispatching priority order from high to low of data; All select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user, select for use the family as from the user other times than other.
The present invention is directed to wlan network and use MU-MIMO The Application of Technology situation; For the counting of MU-MIMO data re-transmission provides a solution; And confirm as main user and from the user to sent the MU-MIMO data, only in Preset Time, do not receive under the situation of CTS of main user's response main user is carried out retransmission count, not to counting from the user; Improve systematic function, data re-transmission causes time delay in the minimizing system.
Description of drawings
Fig. 1 is the flow chart of the method for counting that multi-user's multiple input multiple output data retransmits among the embodiment;
Fig. 2 is the flow chart of the method for counting that multi-user's multiple input multiple output data retransmits in the specific embodiment.
Embodiment
Comprise access point (Access Point,, be called for short AP) and website (STA) in the number system that multi-user's multiple input multiple output data retransmits.
Access point is used for only to main user or simultaneously to main user with from user's transmission transmission claim frame corresponding with multi-user's multiple input multiple output data to be sent; When in Preset Time, not receiving the transmission acknowledgement frame of main user's answer; Increase the value that the short weight corresponding with main user's outgoing data passes counter, keep constant with the value that passes counter from the corresponding short weight of user's outgoing data.
It is one when above that said access point also is used for number said main user; Send said transmission claim frame to all main users; After in Preset Time, receiving the transmission acknowledgement frame of part master user answer; Increase the value that the corresponding short weight of outgoing data of not receiving the main user who sends acknowledgement frame passes counter, it is constant that the short weight that the main user's that the transmission acknowledgement frame that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
After said access point also is used in said Preset Time, receiving the transmission acknowledgement frame that all main users reply, send with the mode of multi-user's multiple-input and multiple-output with main user's outgoing data with from user's outgoing data.Said access point is received the transmission acknowledgement frame that part master user replys in said Preset Time after, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
Also comprise user's determination module in the said access point; The data to be sent of each website that said user's determination module is used for managing to said access point; Select X the first-selected user data that satisfies multi-user's multiple-input and multiple-output matching request successively and select for use user data (wherein Y time according to the dispatching priority order from high to low of data; Select the family for use headed by the user of first-selected user data correspondence; Inferiorly select the corresponding user of user data for use) for time selecting the family for use; All select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user, select for use the family as from the user other times than other.
Wherein, the dispatching priority of data is to take all factors into consideration comprehensive parameters one or more in the following parameter: the time delay grade of the grade of service of data, the precedence in the data queue, data.
As shown in Figure 1, the method for counting that multi-user's multiple input multiple output data retransmits may further comprise the steps:
Step 101, access point are only to main user or simultaneously to main user with from user's transmission transmission claim frame corresponding with multi-user's multiple input multiple output data to be sent.
Access point is determined main user according to multi-user's multiple input multiple output data to be sent and from the user.It also can be more than one that wherein main number of users can be one, and can be one from number of users also can be more than one.Confirm main user and specifically comprise: the data to be sent of each website of managing to said access point from user's method; Select X the first-selected user data that satisfies multi-user's multiple-input and multiple-output matching request successively and select user data for use Y time according to the dispatching priority order from high to low of data; Wherein, Select the family for use headed by the user of first-selected user data correspondence; Inferiorly select for use the corresponding user of user data for time selecting the family for use, all select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user, select for use the family as from the user other times than other.
For example, access point utilizes space multiplexing technique can be simultaneously to send data to a plurality of websites (website of non-AP), and (convergence to be sent of STA1～STAn) is to AP to suppose n website.AP selects according to the dispatching priority of data and to be sently gives STAi (data of 1≤i≤n) are as first-selected user data, and then STAi is called first-selected user; AP waits to send out the inferior user data of selecting for use of the outgoing data conduct of selecting m-1 STA the STA data from remaining n-1; Pairing STApj (1≤i≤m-1) be the inferior family of selecting for use, this m-1 selects for use user data and first-selected user to satisfy the MU-MIMO matching request individual time, and p1～pm-1 is a centrifugal pump; And min [p1.。。，pm-1]≥1，max[p1，。。。，pm-1]≤n。
Can all select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user among the present invention than other; Also can first-selected with time select for use among the family optional one as main user, other users are as from the user.In the above-mentioned dual mode, the former is an optimal way.Access point is divided into a plurality of multi-user's multiple-input and multiple-outputs with each website of being managed in advance and divides into groups; For example be divided into K grouping; Usefulness during each divides into groups satisfies the MU-MIMO matching request per family, and each multipotency that divides into groups comprises D user, and promptly the multipotency of MU-MIMO transmits D user's data simultaneously; Each user can be subordinated to a plurality of groupings, said main user and belong to same grouping from the user.
Main user's number is one when above, and access point sends said transmission claim frame to all main users.
Access point can send that claim frame only sends to that main user (in the MAC Address field of this frame, carrying main user's addresses) also can send to main user simultaneously and from the user with this.
Access point also is each packet allocation group id (groupID); Access point knows that said main user and said will send with the mode of MU-MIMO from user's data; In said transmission claim frame, carrying said main user reaches from the group id of the grouping at user place; Main user and/or receive from the user after, make the grouping under can knowing.
As well known by persons skilled in the art; CTS is the response to the RTS that receives, and receiving terminal can judge whether this RTS issues oneself according to the receiver address among the RTS; If main user has correctly received AP and has issued its RTS then will send CTS, otherwise does not send CTS.
In other embodiments; Access point increases the indication that whether need reply CTS in the RTS that sends; Whether the user who receives this CTS replys CTS according to this indication decision; The STA number of users that needs to reply CTS is less than the pairing STA total number of users of MU-MIMO data to be transmitted, and the pairing STA user of MAC Address may not be the STA user who needs to reply CTS among the RTS.
When step 102, access point are not received the transmission acknowledgement frame of main user's answer in Preset Time, increase the value that the short weight corresponding with main user's outgoing data passes counter, keep constant with the value that passes counter from the corresponding short weight of user's outgoing data.
Main user's number is one when above; Access point is received the transmission acknowledgement frame of part master user answer in Preset Time after; Increase the value that the corresponding short weight of outgoing data of not receiving the main user who sends acknowledgement frame passes counter, it is constant that the short weight that the main user's that the transmission acknowledgement frame that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
Access point passes counter for each outgoing data is provided with short weight, and before sending said transmission claim frame, the corresponding short weight of outgoing data that activates main user passes counter.
AP does not receive CTS in Preset Time (this Preset Time is confirmed by system); Promptly think the failure of this MU-MIMO data sending request; The short weight that main user's outgoing data is corresponding passes counter and adds one; And stop follow-up MU-MIMO data transmission, if short weight biography counter does not reach the maximum restriction then continues these main user MU-MIMO data of scheduling, otherwise abandon this data.
Step 103, access point are received the transmission acknowledgement frame that all main users reply in said Preset Time after, send with the mode of multi-user's multiple-input and multiple-output with main user's outgoing data with from user's outgoing data.Access point is received the transmission acknowledgement frame that part master user replys in said Preset Time after, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
Concrete, wait for SIFS at interval receive the CTS of main user's response at AP after, AP utilizes space multiplexing technique, sends simultaneously with the mode of MU-MIMO with main user with from user's outgoing data.
Specific embodiment
2 pairs of the preferred embodiments of the present invention of following index map describe.
As shown in Figure 2, be illustrated under the situation of only confirming a main user, the method for in wireless data network, carrying out the counting of multi-user's multiple input multiple output data re-transmission comprises:
AP obtains AP to channel condition information between each STA; And according to MU-MIMO pairing algorithm; The STA that satisfies MU-MIMO pairing condition is matched groupings, and each pairing can comprise maximum M STA in dividing into groups, and constructs the MU-MIMO grouping further according to the pairing grouping; And be each MU-MIMO packet allocation groupID, each MU-MIMO divides into groups to comprise a plurality of pairings and divides into groups also can only comprise a pairing grouping.
Confirm that main user with identical with mode the method shown in Figure 1 from user's mode, repeats no more here.
AP writes the RTS destination address field with main station address, and forms physical frame for the RTS frame increases physical overhead, in physical overhead, writes groupID.
As those skilled in the art's understanding; When RTS sent, AP started the wait_CTS timer for this sends, when this timer expiry; When transmit leg does not still correctly receive the CTS of recipient's response; Think that promptly RTS sends failure, otherwise think that then RTS sends successfully, the medium that sends to receiving terminal is simultaneously preengage successfully.
Step 205 when main user correctly receives RTS, is returned CTS, otherwise is not returned CTS.
Whether AP receives the CTS that main user sends before the step 206, wait_CTS timer expiry, if, execution in step 207, otherwise execution in step 208;
Particularly; Be that the corresponding short weight biography counter of main user's outgoing data adds one; Whether the counter that inspection adds after reaches the restriction of short weight biography counter; If do not reach restriction then this main user data can be once more retransmits through scheduling, otherwise notice is high-rise, and stops the retransfer scheduling of this main user data.
Step 208 stops this and sends, and promptly stops to send main user and sends the flow process end from user's data to be sent.
Step 209 is sent with the mode of MU-MIMO with main user's outgoing data with from user's outgoing data, and flow process finishes.
In other embodiments, the main user's who confirms number has one when above, and AP sends RTS to all main users, and the main user who correctly receives RTS returns CTS, and the main user who does not correctly receive RTS does not return CTS.
When AP does not receive the CTS of any main user's answer in the timing of timer; The corresponding short weight of outgoing data that increases each main user passes the value of counter; Keep constant, and stop this transmission with the value that passes counter from the corresponding short weight of user's outgoing data.
When AP receives the CTS of part master user answer in the timing of timer; The corresponding short weight of outgoing data that increases the main user who does not receive that CTS replys passes the value of counter, and it is constant that the short weight that the main user's that the CTS that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
When AP receives the CTS that all main users reply in the timing of timer, send with the mode of MU-MIMO with main user's outgoing data with from user's outgoing data.
AP receives the transmission acknowledgement frame that part master user replys in the timing of timer after, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
The present invention is directed to wlan network and use MU-MIMO The Application of Technology situation; The counting that retransmits for multi-user's multiple input multiple output data provides a solution; And confirm as main user and from the user to sent the MU-MIMO data, only in Preset Time, do not receive under the situation of CTS of main user's response main user is carried out retransmission count, not to counting from the user; Improve systematic function, data re-transmission causes time delay in the minimizing system.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. the method for counting that multi-user's multiple input multiple output data retransmits is characterized in that,
Access point is only to main user or simultaneously to main user with from user's transmission transmission claim frame corresponding with multi-user's multiple input multiple output data to be sent; When in Preset Time, not receiving the transmission acknowledgement frame of main user's answer; Increase the value that the short weight corresponding with main user's outgoing data passes counter, keep constant with the value that passes counter from the corresponding short weight of user's outgoing data.
2. the method for claim 1 is characterized in that,
Said main user's number is one when above; Said access point sends said transmission claim frame to all main users; After in Preset Time, receiving the transmission acknowledgement frame of part master user answer; Increase the value that the corresponding short weight of outgoing data of not receiving the main user who sends acknowledgement frame passes counter, it is constant that the short weight that the main user's that the transmission acknowledgement frame that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
3. the method for claim 1 is characterized in that,
Said access point is received the transmission acknowledgement frame that all main users reply in said Preset Time after, send with the mode of multi-user's multiple-input and multiple-output with main user's outgoing data with from user's outgoing data;
Said access point is received the transmission acknowledgement frame that part master user replys in said Preset Time after, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
4. like claim 1,2 or 3 described methods, it is characterized in that,
Access point is confirmed main user and is comprised from user's method: the data to be sent of each website of managing to said access point; Select X the first-selected user data that satisfies multi-user's multiple-input and multiple-output matching request successively and select user data for use Y time according to the dispatching priority order from high to low of data; All select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user, select for use the family as from the user other times than other.
5. method as claimed in claim 4 is characterized in that,
The dispatching priority of data is to take all factors into consideration comprehensive parameters one or more in the following parameter: the time delay grade of the grade of service of data, the precedence in the data queue, data.
6. method as claimed in claim 4 is characterized in that,
The access point indication that whether middle increase need reply CTS in the said transmission claim frame that sends receives this user who sends claim frame and whether replys the transmission acknowledgement frame according to this indication decision.
7. the number system that multi-user's multiple input multiple output data retransmits is characterized in that,
Comprise access point;
Said access point; Be used for only to main user or simultaneously to main user with from user's transmission transmission claim frame corresponding with multi-user's multiple input multiple output data to be sent; When in Preset Time, not receiving the transmission acknowledgement frame of main user's answer; Increase the value that the short weight corresponding with main user's outgoing data passes counter, keep constant with the value that passes counter from the corresponding short weight of user's outgoing data.
8. system as claimed in claim 7 is characterized in that,
Said access point; Also be used for number said main user and be one when above; Send said transmission claim frame to all main users; After in Preset Time, receiving the transmission acknowledgement frame of part master user answer, increase the value that the corresponding short weight of outgoing data of not receiving the main user who sends acknowledgement frame passes counter, it is constant that the short weight that the main user's that the transmission acknowledgement frame that maintenance is received is corresponding outgoing data is corresponding passes the value of counter.
9. system as claimed in claim 7 is characterized in that,
Said access point, also be used in said Preset Time, receiving the transmission acknowledgement frame that all main users reply after, send with the mode of multi-user's multiple-input and multiple-output with main user's outgoing data with from user's outgoing data; After also being used in said Preset Time, receiving the transmission acknowledgement frame that part master user replys, the main user's that the transmission acknowledgement frame of receiving is corresponding outgoing data and send with the mode of multi-user's multiple-input and multiple-output from user's outgoing data.
10. system as claimed in claim 7 is characterized in that,
Also comprise user's determination module in the said access point;
Said user's determination module; The data to be sent of each website that is used for managing to said access point; Select X the first-selected user data that satisfies multi-user's multiple-input and multiple-output matching request successively and select user data for use Y time according to the dispatching priority order from high to low of data; All select for use the family as main user from high a plurality of times of user as main user or with first-selected user and dispatching priority first-selected user, select for use the family as from the user other times than other.
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Application publication date: 20120321 |