CN102387535B - Allow to send CTS answering method and system - Google Patents

Allow to send CTS answering method and system Download PDF

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Publication number
CN102387535B
CN102387535B CN201010276566.9A CN201010276566A CN102387535B CN 102387535 B CN102387535 B CN 102387535B CN 201010276566 A CN201010276566 A CN 201010276566A CN 102387535 B CN102387535 B CN 102387535B
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China
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sta
group
cts
mimo
reply
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CN102387535A (en
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田开波
李峰
姜静
李楠
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ZTE Corp
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ZTE Corp
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Priority to CN201010276566.9A priority Critical patent/CN102387535B/en
Priority to PCT/CN2011/076925 priority patent/WO2012028034A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of CTS answering method, equipment and system.The method comprises: access point AP sends request and sends RTS frame to the site STA be associated with described AP, comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply in described RTS frame, each MU-MIMO group comprises at least one STA; The group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, and replys CTS successively according to the order determined.Adopt the present invention to save ample resources, improve the fail safe controlled.

Description

Allow to send CTS answering method and system
Technical field
The present invention relates to the communications field, send CTS answering method and CTS system in particular to permission.
Background technology
WLAN (WirelessLocalAreaNetworks, WLAN) is that the employing wireless communication technology is interconnected by computer equipment, forms 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.IEEE (InstituteofElectricalandElectronicsEngineers, Institute of Electrical and Electronics Engineers) 802.11 are one of mainstream technologys of current WLAN (wireless local area network), this agreement mainly specify physical layer PHY and MAC (, MediaAccessControl, media interviews control) 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 (OrthogonalFrequencyDivisionMultiplex from direct sequence spread spectrum skill, OFDM) technology, and in IEEE802.11n, introduce multi-antenna technology, large bandwidth and MU-MIMO (multi-usermultipleinputmultipleoutput, multi-user's multiple-input and multiple-output) is introduced in IEEE802.11ac.
At employing RTS/CTS (RequestToSend/ClearToSend, request to send/allowed to send) mechanism MU-MIMO system in, because channel is limited, exchange between RTS/CTS needs to use specific signaling to control, otherwise there will be the situation fighting for channel, cause the waste of resource.
But when occurring that in MU-MIMO system a large amount of RTS/CTS exchanges, the quantity of control signal is extremely many, takies ample resources when transmitting, also can cause the blocking of channel, reduce the accuracy controlled.
Summary of the invention
Main purpose of the present invention is to provide a kind of CTS answering method, equipment and system, with at least solve above-mentioned in MU-MIMO system, occur that a large amount of TS/CTS exchanges time, the quantity of control signal is extremely many, ample resources is taken when transmitting, also can cause the blocking of channel, reduce the problem of the accuracy controlled.
According to an aspect of the present invention, provide a kind of CTS answering method method, comprising:
Access point AP sends request and sends RTS frame to the site STA be associated with described AP, and comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply in described RTS frame, each MU-MIMO group comprises at least one STA;
The group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, and replys CTS successively according to the order determined.
According to a further aspect in the invention, provide another CTS answering method, comprising:
Access point AP sends request and sends RTS frame to the site STA be associated with described AP, and comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply in described RTS frame, each MU-MIMO group comprises at least one STA; And
The group # receiving place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information the CTS that the STA needing to reply CTS replys, and wherein, the order that CTS replys is determined according to presupposed information.
According to a further aspect in the invention, provide another CTS answering method, comprising:
Site STA receives the request that the access point AP that is associated with described STA sends and sends RTS frame, comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply in described RTS frame, each MU-MIMO group comprises at least one STA; And
Determine self to carry out the order of CTS reply according to presupposed information, and carry out CTS reply when described order arrives.
According to a further aspect in the invention, provide CTS answering system, the site STA comprising access point AP and be associated with described AP:
Described AP, send RTS frame for sending request, comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply in described RTS frame, each MU-MIMO group comprises at least one STA; And, receive the CTS that the group # of the place MU-MIMO group STA identical with the group # of described RTS frame replys;
Described STA, for receiving described RTS frame; And, determine the order self needing to carry out CTS reply and carry out CTS reply according to presupposed information, and carry out CTS reply when described order arrives.By the present invention, AP sends RTS frame and selects the STA in the group # MU-MIMO group identical with the group # that RTS frame comprises to determine the order of carrying out CTS reply according to presupposed information to the STA be associated with this AP, STA, and carries out CTS reply according to the order determined.In this example, RTS/CTS exchanges not to be needed to use specific signaling to control, but by determining that the order that CTS replys is avoided fighting for of channel and collides, can reach saving ample resources, improves the effect of the fail safe controlled.
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 the concrete handling process of the first CTS answering method that the embodiment of the present invention provides;
Fig. 2 is the concrete handling process of the second CTS answering method that the embodiment of the present invention provides;
Fig. 3 is the concrete handling process of the third CTS answering method that the embodiment of the present invention provides;
Fig. 4 is the structural representation of the CTS answering system that the embodiment of the present invention provides.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Mention in the related, when occurring that in MU-MIMO system a large amount of TS/CTS exchanges, the quantity of control signal is extremely many, taking ample resources, also can cause the blocking of channel when transmitting, and reduces the accuracy controlled.
For solving the problems of the technologies described above, embodiments provide a kind of CTS answering method, concrete handling process as shown in Figure 1, comprising:
Step 102, access point AP send RTS frame to being positioned at the STA (Station, website) be associated with AP, and comprise the group # of the MU-MIMO group of RTS frame being carried out to CTS reply in RTS frame, each MU-MIMO group comprises at least one STA;
The group # of step 104, place MU-MIMO group is identical with the group # that RTS frame comprises and determine according to presupposed information according to presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, and replys CTS successively according to the order determined.
Flow process as shown in Figure 1, AP sends RTS frame to the STA be associated with AP, STA selects the STA in the group # MU-MIMO group identical with the group # that RTS frame comprises to determine the order of carrying out CTS reply according to presupposed information, and carries out CTS reply according to the order determined.In this example, RTS/CTS exchanges not to be needed to use specific signaling to control, but by determining that the order that CTS replys is avoided fighting for of channel and collides, can save ample resources.
Flow process as shown in Figure 1, step 102 is before enforcement, and need to divide into groups to STA, one preferably group technology is: AP carries out MU-MIMO grouping to STA associated with it, and is each MU-MIMO group appointment group #; And MU-MIMO grouping information is informed to the STA be associated with AP, wherein, MU-MIMO grouping information comprises all MU-MIMO groups corresponding to group #, this group # and the relative position information of each STA in each MU-MIMO group.Certainly, when implementing, can also adopt other packet modes, such as, utilize the third party of network side to divide into groups to STA, concrete packet mode depends on actual conditions.
During enforcement, preferably, group # can be included in the physics frame head of RTS frame.
During enforcement, AP carries out MU-MIMO grouping to STA associated with it, multiple packet mode can be had, such as, each STA is sorted by mark, the STA of the different numbers such as every 4 or 5 or 6 is divided into one group, also N number of STA can be directly selected arbitrarily to divide in order to one group, wherein, N is natural number, also can divide into groups according to the attribute of each STA, such as, according to the combination of any one or more attribute in the channel condition information of each STA, data business volume, data traffic types, MU-MIMO grouping is carried out to the STA be associated with this AP.
When implementing, after grouping terminates, can be each MU-MIMO group appointment group #, same group # can distribute to a MU-MIMO group, and also can distribute to multiple MU-MIMO group, concrete determines according to actual conditions.
Flow process as shown in Figure 1, step 104 is when implementing, and according to presupposed information, the STA in the MU-MIMO group that group # is identical with the group # that RTS frame comprises determines that it carries out the order of CTS reply, and carry out CTS reply according to the order determined.Presupposed information comprises much information, such as, can comprise and be identified by the preassigned STA of AP, can also comprise the STA mark of first group, or only comprise STA mark, can determine that STA replys the order of CTS according to presupposed information.Wherein, STA, after receiving MU-MIMO grouping information, can know the group # residing for this STA, also can know the relative position information of this STA in MU-MIMO grouping and all MU-MIMO grouping informations under this group # simultaneously.In actual applications, different according to the mode that above-mentioned group # is specified, the MU-MIMO group that group # is identical may be one group, also may be many groups, often at least comprise again a STA in group, but, be not that each STA needs to make CTS reply, in the present embodiment, presupposed information is utilized to screen STA, if STA does not need to carry out CTS reply, then directly select to ignore, CTS need not be replied, but, if STA needs to carry out CTS reply, then need the reply order confirming this STA further, such as, the reply order of this STA is the 3rd, then after the STA coming the 2nd replys, carry out CTS reply.
In order to ensure that the STA carrying out CTS reply there will not be channel to fight for situation, one preferably execution mode is: confirm that the STA carrying out CTS reply occupies different relative position in the MU-MIMO group that group # is identical from the group # that RTS frame comprises.Such as, current existence three MU-MIMO groups, each MU-MIMO group comprises 4 elements, and the group # of three MU-MIMO groups is 1, now, the STA of first reply CTS is first position first MU-MIMO group, and the STA of second reply CTS is second position second MU-MIMO group, and the STA of the 3rd and the 4th reply CTS is the 3rd and the 4th position the 3rd MU-MIMO group.Concrete, such as, three MU-MIMO groups are respectively [STA1, STA2, STA3, STA4], [STA1, STA6, STA7, STA8], [STA1, STA2, STA9, STA3], then the order of replying CTS is STA1, STA6, STA9, STA3.
During enforcement, can also comprise in described RTS frame: the primary STA that in mac frame head, the MAC Address of receiver address territory carrying identifies.Certainly, do not comprise primary STA to be fine yet.Usually, primary STA is that importance is the highest, CTS replys needs STA as soon as possible, in the present embodiment, for ensureing that the service of primary STA obtains preferential guarantee, when there is primary STA in the STA be associated with AP, preferentially allows primary STA reply CTS.
Of course, when implementing, if primary STA is not the STA that current priority is the highest, or for other objects, pressure can be selected to ignore primary STA, now, according to presupposed information, the STA in the MU-MIMO group that group # is identical with the group # that described RTS frame comprises determines that it carries out the order of CTS reply, specifically comprise: the STA that pending CTS replys carries out CTS reply according to the sequencing of its relative position in MU-MIMO group.
In force, preferably, for ensureing that the service of primary STA obtains preferential guarantee, when there is primary STA in the STA be associated with AP, primary STA is preferentially allowed to reply CTS.Now, according to presupposed information, the STA in the MU-MIMO group that group # is identical with the group # that RTS frame comprises determines that it carries out the order of CTS reply, specifically comprise:
When primary STA determines that it is designated pending CTS reply according to presupposed information, reply CTS;
After primary STA replys CTS, the STA that other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
During enforcement, the relative position of STA in MU-MIMO group that the relative position information of primary STA in MU-MIMO group may be specified with other is identical, now, according to presupposed information, STA in the MU-MIMO group that group # is identical with the group # that RTS frame comprises determines that it carries out the order of CTS reply, specifically comprise:
Primary STA according to presupposed information determine its be not designated carry out CTS reply time, reply CTS, and forbid that the STA that other pending CTSs of specifying identical with primary STA relative position reply carries out CTS reply;
After primary STA replys CTS, carry out CTS reply except primary STA and being prohibited replys STA that other the pending CTS except the STA of CTS reply by the sequencing of its relative position in MU-MIMO group.
In like manner, during enforcement, the relative position of STA in MU-MIMO group that the relative position information of primary STA in MU-MIMO group may never be specified with other is identical, but, primary STA specifies the STA needing to reply CTS, now, according to presupposed information, the STA in the MU-MIMO group that group # is identical with the group # that RTS frame comprises determines that it carries out the order of CTS reply, specifically comprise:
When primary STA determines that it is not designated pending CTS reply and identical relative position does not exist the STA of other designated reply CTS according to presupposed information, primary STA replys CTS;
After primary STA replys CTS, the STA that other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
For solving the problems of the technologies described above, the present embodiment additionally provides a kind of CTS answering method, and concrete handling process as shown in Figure 2, comprising:
Step 202, AP send RTS frame to being positioned at the STA be associated with this AP, and comprise the group # of the MU-MIMO group of RTS frame being carried out to CTS reply in RTS frame, each MU-MIMO group comprises at least one STA;
Step 204, receive the CTS that the group # of the MU-MIMO group STA identical with the group # that RTS frame comprises reply, wherein, the order of CTS reply is determined according to presupposed information.
For solving the problems of the technologies described above, the present embodiment additionally provides a kind of CTS answering method, and concrete handling process as shown in Figure 3, comprising:
Step 302, STA receive the RTS frame that the access point AP that is associated with this STA sends, and comprise the group # of the MU-MIMO group of RTS frame being carried out to CTS reply in RTS frame, each MU-MIMO group comprises at least one STA;
Step 304, determine self to carry out the order of CTS reply according to presupposed information, and carry out CTS reply when order arrives.
For the CTS answering method embodiment of the present invention provided describes clearer clearer, be now described with several specific embodiment.
Embodiment one:
6 STA having 1 AP in hypothetical network and be associated with this AP, 6 STA are expressed as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6; Each MU-MIMO group is made up of 4 STA at most, is still considered to be made up of 4 STA less than the MU-MIMO group of 4 STA, and not enough part can be thought has virtual STA to exist.
AP is divided into multiple MU-MIMO group according to the channel condition information of each STA, and grouping information is informed to corresponding STA, assuming that group # is abundant, each group # only indicates a MU-MIMO group, one of them group is (STA-2, STA-6, STA-4, STA-1), group # GroupID=2, AP issue this MU-MIMO grouping information, and packets of information is containing group # GroupID=2, and according to the identifier of tactic 4 STA in bracket above, assuming that the identifier MAC Address of each STA represents.
Because group # GroupID=2 only has a MU-MIMO group, reply the STA in STA i.e. this grouping of CTS, primary STA first replys CTS, all the other STA and replys CTS according to the relative position order in group.
Each STA detects after receiving this information, but only have STA-1, STA-2, STA-4, STA-6 can using this information as useful information, because there is the STA identifier matched with itself in the information received, the useful information that from then on these four STA obtain in information has two aspects: the MU-MIMO group 1) itself belonging to group # GroupID=2; 2) relative position originally in this MU-MIMO group.Such as, the information that from then on STA-1 obtains in information comprises: STA-1 belongs to the MU-MIMO group of group # GroupID=2, and STA-1 is in the 4th position in this grouping simultaneously.
When before the MU-MIMO transfer of data of carrying out this grouping, AP sends RTS frame, and wherein, the MAC Address in the MAC Address territory in the load of RTS frame is the MAC Address of STA-6, and namely STA-6 is primary STA.Group # GroupID=2 information is comprised in the physics frame head of RTS frame; Two aspect information can be obtained: the packet 1) being about to transmission belongs to the MU-MIMO group at its place after 4 STA (STA-2, STA-6, STA-4, STA-1) in the MU-MIMO group of group # GroupID=2 detect RTS frame; 2) STA-6 is the primary STA of this time transmission;
In this example, each STA determines that the judging process of the order of replying CTS is as follows:
sTA-1 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO group information issued, the effective information that STA-1 obtains comprises: the 4th position 1) laying oneself open to this grouping; 2) STA-6 is in second position of this grouping; These information comprehensive, the method provided according to the present embodiment, can obtain STA-1 needs the 4th to reply CTS frame.
sTA-2 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-2 obtains comprises: first position 1) laying oneself open to this grouping; 2) STA-6 is in second position of this grouping; These information comprehensive, the method provided according to the present embodiment, can obtain STA-2 needs second to reply CTS frame.
sTA-4 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-4 obtains comprises: the 3rd position 1) laying oneself open to this grouping; 2) STA-6 is in second position of this grouping; These information comprehensive, the method provided according to the present embodiment, can obtain STA-2 needs the 3rd to reply CTS frame.
sTA-6 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is mated with the MAC Address of oneself, knows it oneself is primary STA further, according to the method that the present embodiment provides, STA-6 wants first to reply CTS frame.
all the other STA (STA-3 and STA-5) receive this RTS frame, resolve the group # information that this frame physics frame head comprises, inconsistent with the group # information at oneself place, without the need to replying CTS.
Finally, STA and the order of replying CTS are as follows:
first STA replying CTS is primary STA and STA-6;
second STA replying CTS is STA-2;
3rd STA replying CTS is STA-4;
4th STA replying CTS is STA-1.
Embodiment two:
9 STA having 1 AP in hypothetical network and be associated with this AP, 9 STA are expressed as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9; Each MU-MIMO group is made up of 4 STA at most, is still considered to be made up of 4 STA less than the MU-MIMO group of 4 STA, and not enough part can be thought has virtual STA to exist.
AP is divided into multiple MU-MIMO group according to the channel condition information of each STA, and all grouping informations are informed to STA, assuming that group # is insufficient, each group # can indicate multiple MU-MIMO group, but there is such constraints, if same STA appears in multiple MU-MIMO groups of same group # instruction, so in the group of this STA in these groups, relative position is fixing.
If group # GroupID=2 indicates three MU-MIMO groups in the present embodiment, three groups are (STA-5, STA-6, STA-7, STA-1), (STA-2, STA-6, STA-4, STA-1), (STA-9, STA-6, STA-4, STA-1), AP issues MU-MIMO grouping information, and packets of information is containing group # GroupID=2, and according to the identifier of tactic 4 STA in bracket above, the order that three MU-MIMO grouping informations are issued is also according to the order of first above written.
Assuming that reply CTS by the STA of first MU-MIMO group issued under the prespecified same suite number of AP, if primary STA specifies the STA replying CTS, still reply CTS according to the relative position order in grouping.
Each STA detects after receiving this information, and concrete testing result is as follows:
sTA-1 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, according to the MU-MIMO grouping information issued, the effective information that STA-1 obtains: lay oneself open in first MU-MIMO group, and be in the 4th position in MU-MIMO group; According to the method that the present embodiment provides, STA-1 needs the 4th to reply CTS frame.
sTA-2 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, according to the MU-MIMO grouping information issued, the effective information that STA-2 obtains: oneself be only in second MU-MIMO group; According to the method that the present embodiment provides, STA-2 does not need to reply CTS.Same with STA-2 in embodiment two have the STA of processing procedure to also have STA-4 and STA-9.
sTA-3 receives RTS frame, resolves this frame, the group # information comprised by frame head, knows the MU-MIMO group oneself do not belonged under this group #, the method provided according to the present embodiment, and STA-3 does not need to reply CTS.In embodiment two, the STA of same processing procedure is had to also have STA-8 with STA-3.
sTA-5 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, according to the MU-MIMO grouping information issued, the effective information that STA-5 obtains: lay oneself open in first MU-MIMO group, and be in first position in this MU-MIMO group; According to the method that the present embodiment provides, STA-5 needs first to reply CTS frame.
sTA-6 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is mated with the MAC Address of oneself, namely know it oneself is primary STA thus, although oneself be primary STA, the method provided according to the present embodiment, STA-6 second replys CTS frame.
sTA-7 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, according to the MU-MIMO grouping information issued, the effective information that STA-7 obtains: lay oneself open in first MU-MIMO group, and be in the 3rd position in this MU-MIMO group; According to the method that the present embodiment provides, STA-7 needs the 3rd to reply CTS frame.
Finally, STA and the order of replying CTS are as follows:
first STA replying CTS is STA-5;
second STA replying CTS is STA-6;
3rd STA replying CTS is STA-7;
4th STA replying CTS is STA-1.
Embodiment three
9 STA having 1 AP in hypothetical network and be associated with this AP, 9 STA are expressed as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9; Each MU-MIMO group is made up of 4 STA at most, is still considered to be made up of 4 STA less than the MU-MIMO group of 4 STA, and not enough part can be thought has virtual STA to exist.
AP is divided into multiple MU-MIMO group according to the channel condition information of each STA, and all grouping informations are informed to STA, assuming that group # is insufficient, each group # can indicate multiple MU-MIMO group, but there is such constraints, if same STA appears in multiple MU-MIMO groups of same group # instruction, so in the group of this STA in these groupings, relative position is fixing.
If group # GroupID=2 indicates three MU-MIMO groups in the present embodiment, three groups are (STA-5, STA-6, STA-7, STA-1), (STA-2, STA-6, STA-4, STA-1), (STA-9, STA-6, STA-4, STA-1), AP issues MU-MIMO grouping information, and packets of information is containing group # GroupID=2, and according to the identifier of tactic 4 STA in bracket above, the order that three MU-MIMO grouping informations are issued is also according to the order of first above written.
Assuming that reply CTS by the STA of first MU-MIMO group issued under the prespecified same suite number of AP, if primary STA specifies the STA replying CTS, then primary STA first replys CTS.
Each STA detects after receiving this information, and testing result is as follows:
sTA-1 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-1 obtains comprises: 1) lay oneself open in three MU-MIMO groups, and be in the 4th position in MU-MIMO group; 2) STA-6 and primary STA is in three MU-MIMO groups, and is in second position a MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-1 needs the 4th to reply CTS frame.
sTA-2 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-2 obtains comprises: 1) oneself be only in second MU-MIMO group; According to the method that the present embodiment provides, STA-2 does not need to reply CTS frame.Same with STA-2 in the present embodiment have the STA of processing procedure to also have STA-4 and STA-9.
sTA-3 receives RTS frame, resolves this frame, the group # information comprised by frame head, knows the MU-MIMO group oneself do not belonged under this group #, the method provided according to the present embodiment, does not need to reply CTS.In the present embodiment, the STA of same processing procedure is had to also have STA-8 with STA-3.
sTA-5 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-5 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in first position in this MU-MIMO group; 2) STA-6 and primary STA is in three MU-MIMO groups, and is in second position a MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, although STA-5 is in first position of first group, it is not primary STA, after thus needing wait, replys CTS frame for second.
sTA-6 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is mated with the MAC Address of oneself, namely knows it oneself is primary STA thus, according to the method that the present embodiment provides, STA-6 first replys CTS frame.
sTA-7 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-7 obtains comprises: 1) lay oneself open in first MU-MIMO group, and in this MU-MIMO group, be in the 3rd position; 2) STA-6 and primary STA is in three MU-MIMO groups, and is in second position a MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-7 needs the 3rd to reply CTS frame.
Finally, STA and the order of replying CTS are as follows:
first STA replying CTS is primary STA and STA-6;
second STA replying CTS is STA-5;
3rd STA replying CTS is STA-7;
4th STA replying CTS is STA-1.
Embodiment four:
9 STA having 1 AP in hypothetical network and be associated with this AP, 9 STA are expressed as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9; Each MU-MIMO group is made up of 4 STA at most, is still considered to be made up of 4 STA less than the MU-MIMO group of 4 STA, and not enough part can be thought has virtual STA to exist.
AP is divided into multiple MU-MIMO group according to the channel condition information of each STA, and all grouping informations are informed to STA, assuming that group # is insufficient, each group # can indicate multiple MU-MIMO group, but there is such constraints, if same STA appears in multiple MU-MIMO groups of same group # instruction, so in the group of this STA in these groups, relative position is fixing.
If group # GroupID=2 indicates three MU-MIMO groups in the present embodiment, three groups are (STA-5, STA-8, STA-7, STA-1), (STA-2, STA-6, STA-4, STA-1), (STA-9, STA-6, STA-4, STA-1), AP issues MU-MIMO grouping information, and packets of information is containing group # GroupID=2, and according to the identifier of tactic 4 STA in bracket above, the order that three MU-MIMO grouping informations are issued is also according to the order of first above written.
Assuming that reply CTS by the STA of first MU-MIMO group issued under the prespecified same suite number of AP.If primary STA specifies the STA replying CTS, then it is without the need to replying CTS.
Each STA detects after receiving this information, and testing result is as follows:
sTA-1 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-1 obtains comprises: 1) lay oneself open in three MU-MIMO groups, and be in the 4th position in MU-MIMO group; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-1 needs the 4th to reply CTS frame.
sTA-2 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-2 obtains comprises: 1) oneself be only in second MU-MIMO group; According to the method that the present embodiment provides, STA-2 does not need to reply CTS frame.Same with STA-2 in the present embodiment have the STA of processing procedure to also have STA-4 and STA-9.
sTA-3 receives RTS frame, resolves this frame, the group # information comprised by frame head, knows the MU-MIMO group oneself do not belonged under this group #, the method provided according to the present embodiment, does not need to reply CTS.
sTA-5 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-5 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in MU-MIMO group first position; 2) STA-6 and primary STA is in two MU-MIMO groupings, and is in second position in MU-MIMO grouping, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-5 needs first to reply CTS frame.
sTA-6 receives RTS frame, resolve this frame, the group # information comprised by frame head, is known the MU-MIMO group oneself belonged under this group #, resolves the MAC Address that this frame frame load comprises, this address is mated with the MAC Address of oneself, namely know it oneself is primary STA thus, according to the MU-MIMO grouping information issued, STA-6 is not present in first MU-MIMO group, according to the method that the present embodiment provides, STA-6 is without the need to replying CTS frame.
sTA-7 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-7 obtains comprises: 1) lay oneself open in first MU-MIMO group, and in this MU-MIMO group, be in the 3rd position; 2) STA-6 and primary STA is in two MU-MIMO groupings, and is in second position in MU-MIMO grouping, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-7 needs the 3rd to reply CTS frame.
sTA-8 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-8 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in second position in this MU-MIMO group; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO grouping, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-8 needs the 4th to reply CTS frame.。
Finally, STA and the order of replying CTS are as follows:
first STA replying CTS is STA-5;
second STA replying CTS is STA-8;
3rd STA replying CTS is STA-7;
4th STA replying CTS is STA-1.
Embodiment five:
9 STA having 1 AP in hypothetical network and be associated with this AP, 9 STA are expressed as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9; Each MU-MIMO grouping is made up of 4 STA at most, and be still considered to be made up of 4 STA less than the MU-MIMO grouping of 4 STA, not enough part can be thought has virtual STA to exist.
AP is divided into multiple MU-MIMO group according to the channel condition information of each STA, and all grouping informations are informed to STA, assuming that group # is insufficient, each group # can indicate multiple MU-MIMO group, but there is such constraints, if same STA appears in multiple MU-MIMO groups of same group # instruction, so in the group of this STA in these groups, relative position is fixing.
If group # GroupID=2 indicates three MU-MIMO groups in the present embodiment, three groups are (STA-5, STA-8, STA-7, STA-1), (STA-2, STA-6, STA-4, STA-1), (STA-9, STA-6, STA-4, STA-1), AP issues MU-MIMO grouping information, and grouping information comprises group # GroupID=2, and according to the identifier of tactic 4 STA in bracket above, the order that three MU-MIMO grouping informations are issued is also according to the order of first above written.
Assuming that reply CTS by the STA of first MU-MIMO group issued under the prespecified same suite number of AP, and primary STA first replys CTS, if primary STA specifies the STA replying CTS, from the STA specifying reply CTS, the STA occupying same packets position with primary STA to be rejected.
Each STA detects after receiving this information, and testing result is as follows:
sTA-1 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-1 obtains comprises: 1) lay oneself open in three MU-MIMO groups, and be in the 4th position in MU-MIMO group; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-1 needs the 4th to reply CTS frame.
sTA-2 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-2 obtains comprises: 1) oneself be only in second MU-MIMO group; According to the method that the present embodiment provides, STA-2 does not need to reply CTS frame.In the present embodiment, territory is same with STA-2 has the STA of processing procedure to also have STA-4 and STA-9.
sTA-3 receives RTS frame, resolves this frame, the group # information comprised by frame head, knows the MU-MIMO group oneself do not belonged under this group #, the method provided according to the present embodiment, does not need to reply CTS.
sTA-5 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-5 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in MU-MIMO group first position; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, although STA-5 is in first position of first grouping, it is not primary STA, thus needs to wait for that latter second is replied CTS frame.
sTA-6 receives RTS frame, resolve this frame, the group # information comprised by frame head, is known the MU-MIMO group oneself belonged under this group #, resolves the MAC Address that this frame frame load comprises, this address is mated with the MAC Address of oneself, namely know it oneself is primary STA thus, the method provided according to the present embodiment, although STA-6 is not present in first MU-MIMO group, but STA-6 is primary STA, therefore STA-6 first replys CTS frame.
sTA-7 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-7 obtains comprises: 1) lay oneself open in first MU-MIMO group, and in this MU-MIMO group, be in the 3rd position; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO grouping, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-7 needs the 3rd to reply CTS frame.
sTA-8 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-8 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in second position in this MU-MIMO group; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, although STA-8 is in first MU-MIMO group, its relative position in a packet and the relative position of primary STA-6 within dividing into groups in its place repeat, therefore STA-8 can not reply CTS frame.
Finally, STA and the order of replying CTS are as follows:
first STA replying CTS is primary STA and STA-6;
second STA replying CTS is STA-5;
3rd STA replying CTS is STA-7;
4th STA replying CTS is STA-1.
Embodiment six:
9 STA having 1 AP in hypothetical network and be associated with this AP, 9 STA are expressed as STA-1, STA-2, STA-3, STA-4, STA-5, STA-6, STA-7, STA-8, STA-9; Each MU-MIMO group is made up of 4 STA at most, is still considered to be made up of 4 STA less than the MU-MIMO group of 4 STA, and not enough part can be thought has virtual STA to exist.
AP is divided into multiple MU-MIMO group according to the channel condition information of each STA, and all grouping informations are informed to STA, assuming that group # is insufficient, each group # can indicate multiple MU-MIMO group, but there is such constraints, if same STA appears in multiple MU-MIMO groups of same group # instruction, so in the group of STA in these groupings, relative position is fixing.
If group # GroupID=2 indicates three MU-MIMO groups in the present embodiment, three groups are (STA-5, STA-8, STA-7, STA-1), (STA-2, STA-6, STA-4, STA-1), (STA-9, STA-6, STA-4, STA-1), AP issues MU-MIMO grouping information, and grouping information comprises group # GroupID=2, and according to the identifier of tactic 4 STA in bracket above, the order that three MU-MIMO grouping informations are issued is also according to the order of first above written.
Assuming that reply CTS by the STA of first MU-MIMO group issued under the prespecified same suite number of AP, and primary STA first replys CTS, if primary STA specifies the STA replying CTS, then specify the STA replying CTS, after primary STA replys CTS, then reply CTS according to sequence of positions in a packet.
Each STA detects after receiving this information, and testing result is as follows:
sTA-1 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-1 obtains comprises: 1) lay oneself open in three MU-MIMO groups, and be in the 4th position in MU-MIMO group; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-1 needs the 5th to reply CTS frame.
sTA-2 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-2 obtains comprises: 1) oneself be only in second MU-MIMO group; According to the method that the present embodiment provides, STA-2 does not need to reply CTS frame.In the present embodiment, territory is same with STA-2 has the STA of processing procedure to also have STA-4 and STA-9.
sTA-3 receives RTS frame, resolves this frame, the group # information comprised by frame head, knows the MU-MIMO group oneself do not belonged under this group #, the method provided according to the present embodiment, does not need to reply CTS.
sTA-5 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that in this frame mac frame head, receiver address territory comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-5 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in MU-MIMO group first position; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, although STA-5 is in first position of first group, it is not primary STA, thus needs to wait for that latter second is replied CTS frame.
sTA-6 receives RTS frame, resolve this frame, the group # information comprised by frame head, is known the MU-MIMO group oneself belonged under this group #, resolves the MAC Address that this frame frame load comprises, this address is mated with the MAC Address of oneself, namely know it oneself is primary STA thus, the method provided according to the present embodiment, although STA-6 is not present in first MU-MIMO group, but STA-6 is primary STA, therefore STA-6 first replys CTS frame.
sTA-7 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-7 obtains comprises: 1) lay oneself open in first MU-MIMO group, and in this MU-MIMO group, be in the 3rd position; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-7 needs the 4th to reply CTS frame.
sTA-8 receives RTS frame, resolve this frame, the group # information comprised by frame head, know the MU-MIMO group oneself belonged under this group #, resolve the MAC Address that this frame frame load comprises, this address is not mated with the MAC Address of oneself, and know it oneself is not primary STA further, primary STA is STA-6; According to the MU-MIMO grouping information issued, the effective information that STA-8 obtains comprises: 1) lay oneself open in first MU-MIMO group, and be in second position in this MU-MIMO group; 2) STA-6 and primary STA is in two MU-MIMO groups, and is in second position in MU-MIMO group, but is not present in first MU-MIMO group; These information comprehensive, the method provided according to the present embodiment, STA-8 needs the 3rd to reply CTS frame.
Finally, STA and the order of replying CTS are as follows:
first STA replying CTS is primary STA and STA-6;
second STA replying CTS is STA-5;
3rd STA replying CTS is STA-8;
4th STA replying CTS is STA-7;
5th STA replying CTS is STA-1.
The present embodiment additionally provides a kind of CTS answering system, concrete structure as shown in Figure 4, the site STA 402 comprising access point AP401 and be associated with AP401:
AP401, send RTS frame for sending request, comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of RTS frame being carried out to CTS reply in RTS frame, each MU-MIMO group comprises at least one STA; And, receive the CTS that the group # of the place MU-MIMO group STA identical with the group # that RTS frame comprises replys;
STA402, for receiving RTS frame; And, determine self to carry out the order of CTS reply according to presupposed information, and carry out CTS reply when order arrives.
In one embodiment, AP401 can also be used for carrying out MU-MIMO grouping to STA402 associated with it, and is each MU-MIMO group appointment group #; And
MU-MIMO grouping information is informed to the STA402 be associated with AP401, wherein, MU-MIMO grouping information comprises all MU-MIMO groups corresponding to group #, this group # and the relative position information of each STA402 in each MU-MIMO group.
In one embodiment, AP401 can also be used for the combination of any one or more attribute in channel condition information according to STA associated with it, data business volume, data traffic types, carries out MU-MIMO grouping to STA associated with it.
In one embodiment, AP401 can also be used for same group number being distributed at least one MU-MIMO and divides into groups.
In one embodiment, STA402 can also be used for: determine that the STA that each pending CTS replys occupies different relative position in the MU-MIMO group that group # is identical from the group # that RTS frame comprises.
In one embodiment, STA402 can also be used for: according to respectively waiting that the sequencing of the relative position of STA in MU-MIMO group of replying CTS carries out CTS reply.
In one embodiment, AP401 can also be used for: send the RTS frame that the multiple access also comprising receiver address territory carrying in mac frame head accesses the primary STA that channel MAC Address identifies.
In one embodiment, STA402 can also be used for: when determining that primary STA is designated pending CTS reply according to presupposed information, makes primary STA reply CTS; And after primary STA replys CTS, the STA making other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
In one embodiment, STA402 can also be used for: according to presupposed information determine primary STA be not designated carry out CTS reply time, make primary STA reply CTS, and forbid that the STA that other pending CTSs of specifying identical with primary STA relative position reply carries out CTS reply; And, after primary STA replys CTS, carry out CTS reply except primary STA and being prohibited replys STA that other the pending CTS except the STA of CTS reply by the sequencing of its relative position in MU-MIMO group.
In one embodiment, STA402 can also be for: determine that according to presupposed information primary STA is not designated and carry out CTS reply and identical relative position do not exist other when being designated the STA replying CTS, make primary STA reply CTS; And after primary STA replys CTS, the STA making other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
As can be seen from the above description, present invention achieves following technique effect:
In the above-described embodiments, AP sends RTS frame to the STA be associated with this AP, STA selects the STA in the group # MU-MIMO group identical with the group # that RTS frame comprises to determine the order of carrying out CTS reply according to presupposed information, and carries out CTS reply according to the order determined.In this example, RTS/CTS exchanges not to be needed to use specific signaling to control, but by determining that the order that CTS replys is avoided fighting for of channel and collides, can save ample resources, improves the fail safe controlled.
Further, when AP specifies primary STA by RTS frame, make primary STA preference return CTS, ensure that the service of primary STA obtains preferential guarantee.
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 (18)

1. allow to send a CTS answering method, it is characterized in that, comprising:
Access point AP sends request and sends RTS frame to the site STA be associated with described AP, the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply is comprised in described RTS frame, each MU-MIMO group comprises at least one STA, wherein, before described AP sends RTS frame to the STA be associated with described AP, also comprise: described AP carries out MU-MIMO grouping to STA associated therewith, and be each MU-MIMO group appointment group #; And MU-MIMO grouping information is informed to the STA be associated with described AP, wherein, described MU-MIMO grouping information comprises all MU-MIMO groups corresponding to group #, this group # and the relative position information of each STA in each MU-MIMO group;
The group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, and replys CTS successively according to the order determined;
Wherein, different relative position is occupied in the MU-MIMO group that the group # that the STA carrying out CTS reply comprises at described group # and described RTS frame is identical.
2. method according to claim 1, is characterized in that, described AP carries out MU-MIMO grouping to STA associated with it, comprising:
Described AP, according to the combination of any one or more attribute in the channel condition information of STA associated with it, data business volume, data traffic types, carries out MU-MIMO grouping to STA associated with it.
3. method according to claim 1, it is characterized in that, described is each MU-MIMO group appointment group #, comprising: same group number is distributed at least one MU-MIMO and divide into groups, and the relative position of the STA now in each MU-MIMO grouping is fixing.
4. method according to claim 1, is characterized in that, also comprises in described RTS frame: the primary STA that in mac frame head, the MAC address of receiver address territory carrying identifies.
5. method according to claim 4, it is characterized in that, the group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, comprising:
The STA that pending CTS replys carries out CTS reply according to the sequencing of its relative position in MU-MIMO group.
6. method according to claim 4, it is characterized in that, the group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, comprising:
When described primary STA determines that it is designated pending CTS reply according to described presupposed information, reply CTS;
After described primary STA replys CTS, the STA that other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
7. method according to claim 4, it is characterized in that, the group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, comprising:
Described primary STA according to described presupposed information determine its be not designated carry out CTS reply time, reply CTS, and forbid that the STA that other pending CTSs of specifying identical with described primary STA relative position reply carries out CTS reply;
After described primary STA replys CTS, carry out CTS reply except described primary STA and being prohibited replys STA that other the pending CTS except the STA of CTS reply by the sequencing of its relative position in MU-MIMO group.
8. method according to claim 4, it is characterized in that, the group # of place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information according to described presupposed information, the STA needing to reply CTS determines that it replys the order of CTS, comprising:
When described primary STA determines that it is not designated pending CTS reply and identical relative position does not exist the STA of other designated reply CTS according to described presupposed information, described primary STA replys CTS;
After described primary STA replys CTS, the STA that other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
9. allow to send a CTS answering method, it is characterized in that, comprising:
Access point AP sends request and sends RTS frame to the site STA be associated with described AP, the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply is comprised in described RTS frame, each MU-MIMO group comprises at least one STA, wherein, before described AP sends RTS frame to the STA be associated with described AP, also comprise: described AP carries out MU-MIMO grouping to STA associated therewith, and be each MU-MIMO group appointment group #; And MU-MIMO grouping information is informed to the STA be associated with described AP, wherein, described MU-MIMO grouping information comprises all MU-MIMO groups corresponding to group #, this group # and the relative position information of each STA in each MU-MIMO group; And
The group # receiving place MU-MIMO group is identical with the group # that described RTS frame comprises and determine according to presupposed information the CTS that the STA needing to reply CTS replys, and wherein, the order that CTS replys is determined according to presupposed information;
Wherein, different relative position is occupied in the MU-MIMO group that the group # that the STA carrying out CTS reply comprises at described group # and described RTS frame is identical.
10. allow to send a CTS answering method, it is characterized in that, comprising:
Site STA receives the request that the access point AP that is associated with described STA sends and sends RTS frame, the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply is comprised in described RTS frame, each MU-MIMO group comprises at least one STA, wherein, before described STA receives the RTS frame that the described AP that is associated with described STA sends, also comprise: described AP carries out MU-MIMO grouping to STA associated therewith, and be each MU-MIMO group appointment group #; And MU-MIMO grouping information is informed to the STA be associated with described AP, wherein, described MU-MIMO grouping information comprises all MU-MIMO groups corresponding to group #, this group # and the relative position information of each STA in each MU-MIMO group; And
Determine self to carry out the order of CTS reply according to presupposed information, and carry out CTS reply when described order arrives;
Wherein, different relative position is occupied in the MU-MIMO group that the group # that the STA carrying out CTS reply comprises at described group # and described RTS frame is identical.
11. 1 kinds allow to send CTS answering system, it is characterized in that, the site STA comprising access point AP and be associated with described AP:
Described AP, send RTS frame for sending request, comprise the group # of multi-user's multiple-input and multiple-output MU-MIMO group of described RTS frame being carried out to CTS reply in described RTS frame, each MU-MIMO group comprises at least one STA; MU-MIMO grouping is carried out to the STA associated with it, and is each MU-MIMO group appointment group #; MU-MIMO grouping information is informed to the STA be associated with described AP, wherein, described MU-MIMO grouping information comprises all MU-MIMO groups corresponding to group #, this group # and the relative position information of each STA in each MU-MIMO group; And, receive the CTS that the group # of the place MU-MIMO group STA identical with the group # of described RTS frame replys;
Described STA, for receiving described RTS frame; And, determine the order self needing to carry out CTS reply and carry out CTS reply according to presupposed information, and carry out CTS reply when described order arrives;
Wherein, described STA also for: determine to occupy different relative position in the MU-MIMO group that group # that STA that each pending CTS replys comprises at described group # and described RTS frame is identical.
12. systems according to claim 11, it is characterized in that, described AP also for the combination of any one or more attribute in the channel condition information according to STA associated with it, data business volume, data traffic types, carries out MU-MIMO grouping to STA associated with it.
13. systems according to claim 11, is characterized in that, described AP also divides into groups for same group number being distributed at least one MU-MIMO.
14. systems according to claim 11, is characterized in that, described STA also for: according to respectively waiting that the sequencing of the relative position of STA in MU-MIMO group of replying CTS carries out CTS reply.
15. systems according to claim 11, is characterized in that, described AP is also for the RTS frame that sends the primary STA that the MAC address that also comprises the carrying of receiver address territory in mac frame head identifies.
16. systems according to claim 15, is characterized in that, described STA also for: according to described presupposed information determine described primary STA be designated pending CTS reply time, make described primary STA reply CTS; And after described primary STA replys CTS, the STA making other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
17. systems according to claim 15, it is characterized in that, described STA also for: according to described presupposed information determine described primary STA be not designated carry out CTS reply time, make described primary STA reply CTS, and forbid that the STA that other pending CTSs of specifying identical with described primary STA relative position reply carries out CTS reply; And, after described primary STA replys CTS, carry out CTS reply except described primary STA and being prohibited replys STA that other the pending CTS except the STA of CTS reply by the sequencing of its relative position in MU-MIMO group.
18. systems according to claim 15, it is characterized in that, described STA also for: according to described presupposed information determine described primary STA be not designated carry out CTS reply and identical relative position does not exist other be designated reply the STA of CTS time, make described primary STA reply CTS; And after described primary STA replys CTS, the STA making other pending CTS reply carries out CTS reply by the sequencing of its relative position in MU-MIMO group.
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