CN101364912B

CN101364912B - Method for spacial multiplex establishment by direct link, work station and control access point apparatus

Info

Publication number: CN101364912B
Application number: CN2007101432661A
Authority: CN
Inventors: 单娜; 马慧
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-08-07
Filing date: 2007-08-07
Publication date: 2012-01-11
Anticipated expiration: 2027-08-07
Also published as: CN101364912A

Abstract

The invention discloses a DLS (direct-link setup) space multiplexing method, and workstations and a control access point supporting the DLS. The method comprises the following steps: determining DLS links polled at the same time according to the number of the current idle service channels and/or information of adjacent workstations reported by the workstation; and transmitting a polling message, and indicating the DLS links polled at the same time in the polling message. The method can achieve DLC space multiplexing to simultaneously poll the plurality of DLS links, and the plurality of corresponding workstations can simultaneous carry out DLS service, thereby improving the space utilization rate of the system resources.

Description

Direct link is set up method for spacial multiplex, work station and control access point apparatus

Technical field

The present invention relates to the communications field, relate in particular to a kind of direct link and set up the method for spatial reuse, work station and control access point apparatus.

Background technology

Traditional WLAN (Wireless Local Area Network, WLAN) network comprises two kinds of latticed forms, and a kind of is BSS (Basic Service Set, the Basic Service Set) network of architecture; Another kind is IBSS (Independent Basic Service Set, the independent basic service set) network of Ad hoc (self-organizing) form.BSS comprises a centralized control AP (Access Point, access point) and one or more STA (Station, work station).

In BSS, STA adds polling list polling table when related with AP, and AP is at CFP (Contention FreePeriod; Contention-free period) CF-Poll (CF poll frame is sent in clean culture; Be a kind of of Frame) each STA with non-competing poll ability (CF Pollable) in the polling list polling table is carried out poll,, then directly sent if there is business to send to AP by the STA of poll; If do not have, then send Null frame (empty frame) or CF-ACK (CF affirmation) this poll of frame end.

The broadcast that interacting message under the BSS between the STA or STA send all will be transmitted through AP, and is as shown in Figure 1.In Fig. 1, when STA-1 had business to send to STA-2, STA-1 at first sent the professional AP of giving, and AP transmits and should business give STA-2.If STA-2 is in PS (Power Save, economize on electricity) pattern, then AP elder generation buffer memory should business, treats again the business of buffer memory to be transmitted to STA-2 after STA-2 wakes up.

In order to improve efficiency of transmission,, as shown in Figure 2 between the STA through setting up DLS (Direct-Link Setup, direct link is set up) the direct interactive service of link.

In Fig. 2; When STA-1 has business and STA-2 mutual; STA-1 sends DLS to AP and sets up request message, comprises (shown in the step 1a among Fig. 2) such as MAC (Media Access Control, medium access control) addresses of ability information, STA-1 and the STA-2 of STA-1 in this request message; If STA-2 has been related with this AP, allow direct writing stream in this BSS, and STA-2 is QoS (Qualityof Service, service quality) node, then AP transmits this DLS and sets up request message to STA-2 (shown in the step 1b among Fig. 2); If STA-2 accepts and should ask, then STA-2 sends DLS to AP and replys message, and this answer message comprises (shown in the step 2a among Fig. 2) such as MAC Addresss of ability information, STA-1 and the STA-2 of STA-2; AP transmits this DLS and replys message to STA-1, and the DLS between STA-1 and the STA-2 sets up process and accomplishes (shown in the step 2b among Fig. 2).

DLS shown in Figure 2 sets up in the process, and it is as shown in table 1 that DLS sets up request message format, and it is as shown in table 2 that DLS replys message format.

Table 1

In proper order	Information	Explanation
				1	Category	Frame type, value are that 2 these frame types of expression are DLS
2	Action	Type of message, value are that 0 expression is a request message
			3	Destination?MACAddress	The physical address of destination node
4	Source?MACAddress	The physical address of source node
			5	Capability?Information	The ability information of source node
6	DLS?Timeout?Value	The effective time of DLS
			7	Supported?Rates	The rate information that source node is supported
8	Extended?Supported?Rates	The spreading rate information that source node is supported

Table 2

In proper order	Information	Explanation
				1	Category	Frame type, value are that 2 these frame types of expression are DLS
2	Action	Type of message, value are that 1 expression is a response message
			3	Status?Code	DLS sets up success or failure and failure cause sign
4	Destination?MACAddress	The physical address of destination node
			5	Source?MACAddress	The physical address of source node

?6	Capability?Information	The ability information of source node
			?7	Supported?Rates	The rate information that source node is supported
?8	Extended?Supported?Rates	The spreading rate information that source node is supported

802.11 regulation is as long as exist effective DLS between two STA in the agreement, STA just can not get into the PS pattern, otherwise will cause timer expired, and then removes the DLS between these two STA.

The inventor finds that there is following defective at least in prior art in the invention process:

Existing 802.11 agreements are after setting up DLS between the STA; Use HCCA (HCF Controlled Channel Access; The Hybrid Coordination Function control channel inserts) when inserting; Each poll can only have a pair of STA that has set up DLS to communicate, and other STA that set up DLS then can not communicate by letter, thereby cause space waste.

Summary of the invention

Embodiments of the invention have disclosed work station and two kinds of control access point apparatus of a kind of DLS method for spacial multiplex, a kind of DLS of support, to realize the spatial reuse of DLS.

DLS method for spacial multiplex according to the embodiment of the invention comprises the steps:

The adjacent work station information of the said work station that reports according to work station is confirmed the DLS link of poll simultaneously, and the adjacent work station information of the said work station that perhaps reports according to Traffic Channel quantity and the work station of current free time is confirmed the DLS link of while poll;

Send polling message, and in said polling message, indicate the DLS link of said while poll;

The adjacent work station information of the said said work station that reports according to work station confirms that the principle of the DLS link of poll comprises simultaneously:

In the DLS link of while poll, not adjacent work station between pairing work station of each DLS link and the pairing work station of other any one DLS link;

The adjacent work station information of the said said work station that reports according to Traffic Channel quantity and the work station of current free time, confirm that the DLS link of poll comprises simultaneously:

When the Traffic Channel of current free time is one, confirm the DLS link of poll simultaneously according to said adjacent work station information, and with said DLS link assignment on the Traffic Channel of said current free time;

When the Traffic Channel of current free time is a plurality of; Confirm the DLS link of poll simultaneously according to the quantity of the Traffic Channel of said free time; And according to said adjacent work station information confirm respectively can with the said DLS link DLS link of poll simultaneously, with every group simultaneously the DLS link of poll be assigned to respectively on the Traffic Channel of said a plurality of free time.

Work station according to a kind of DLS of support of the embodiment of the invention comprises:

The DLS request sending module is used for sending DLS to the control access point and sets up request message, and request is set up the DLS link with the purpose work station;

DLS responds receiver module, be used to receive come from that said control access point returns set up the response message of request message to said DLS, carry sign in the said response message into said DLS link assignment;

The neighbor information reporting module is used for to controlling the adjacent work station information that access point reports said work station;

The poll receiver module; Be used to receive the polling message that said control access point sends; The DLS link that the indication simultaneous wheels is ask in the said polling message, the DLS link of said while poll are to be confirmed according to the said adjacent work station information that said neighbor information reporting module reports by said control access point;

The service interaction module; Be used for receiving said polling message at said poll receiver module; And when the DLS chain line that the indicated DLS chain line of said polling message and said DLS response receiver module receive is identical, carry out service interaction through said DLS link.

A kind of control access point apparatus according to the embodiment of the invention comprises:

The neighbor information receiver module is used for the adjacent work station information of the said work station that receiving workstation sends;

DLS poll determination module; Be used for adjacent work station information according to said work station; Confirm the DLS link of poll simultaneously; Said adjacent work station information according to said work station confirms that the principle of the DLS link of poll comprises simultaneously: in the DLS link of while poll, be not adjacent work station between pairing work station of each DLS link and the pairing work station of other any one DLS link;

The polling message sending module is used to send polling message, the DLS link that the indication simultaneous wheels is ask in the said polling message;

Said DLS poll determination module is confirmed the DLS link of poll simultaneously according to the quantity of the Traffic Channel of said free time; And according to said adjacent work station information confirm respectively can with the said DLS link DLS link of poll simultaneously, with every group simultaneously the DLS link of poll be assigned to respectively on the Traffic Channel of said free time.

Another kind control access point apparatus according to the embodiment of the invention comprises:

The traffic channel state acquisition module is used to obtain the quantity of the Traffic Channel of current free time;

DLS poll determination module is used for the quantity according to the idle business channel that gets access to, and confirms that the DLS link of equal number carries out poll, and is assigned to said DLS link on the idle business channel respectively;

The polling message sending module is used to send polling message, the DLS link that the indication simultaneous wheels is ask in the said polling message.

In the above embodiment of the present invention; Adjacent work station information that reports according to work station and/or the Traffic Channel quantity of current free time; Confirm the DLS link of poll simultaneously, when carrying out the DLS poll, in the polling message that sends, carry the indication information of the DLS link of poll simultaneously; Thereby realize the spatial reuse of DLS; Solved in the prior art after a plurality of DLS link establishments, can only have the corresponding a pair of work station of a DLS link to carry out the problem of service interaction at every turn, and then improved DLS mechanism space availability ratio.

Description of drawings

Fig. 1 is the sketch map of BSS framework in the prior art;

Fig. 2 is the sketch map of DLS link establishment process in the prior art;

Fig. 3 is the schematic flow sheet of DLS spatial reuse when using HCCA in the embodiment of the invention one;

Fig. 4 is for setting up the schematic flow sheet of DLS link in the embodiment of the invention one;

Fig. 5 is the schematic flow sheet of the embodiment of the invention two;

Fig. 6 is the schematic flow sheet of the embodiment of the invention three;

Fig. 7 is the work station structural representation of the embodiment of the invention;

Fig. 8 is one of control access point apparatus structural representation of the embodiment of the invention;

Fig. 9 be the embodiment of the invention control access point apparatus structural representation two.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.

Embodiment one

Present embodiment has been described under the situation of a Traffic Channel; The relation information of the neighbours STA that AP reports according to STA; Confirm the DLS link of poll simultaneously, realize a plurality of DLS links of poll simultaneously, make corresponding many processes that STA realized service interaction through the DLS link.

Referring to Fig. 3, the schematic flow sheet of DLS spatial reuse during the use HCCA that provides for the embodiment of the invention, concrete steps comprise:

Step 301, AP receive the DLS neighbor table that each STA reports; The information that includes the adjacent STA of the owner STA of this DLS neighbor table in the DLS neighbor table; AID (AssociationID, association identification) or MAC (Media Access Control, medium access control) address like adjacent S TA.

When contention-free period AP poll STA, the STA that is polled to sends broadcast, and through this broadcast, adjacent S TA will collect this broadcast sender's information, and writes local DLS neighbor table.When STA had the report cycle of service needed transmission or setting to arrive, STA reported AP with its DLS neighbor table.

Step 302, when AP needs poll DLS link, the DLS neighbor table that reports according to each STA is confirmed the DLS link of poll simultaneously.

Step 303, AP send polling message, wherein carry the indication information of the DLS link of poll simultaneously.

AP can send polling message in several ways, like broadcast mode or mode of unicast.AP is the DLS link of indication simultaneous wheels inquiry in polling message in several ways, comprising:

AP is through carrying DSIM (Direct Stream Identifier Message in the beacon frame; Direct writing stream Indication message) information unit or DLSID Announcement (indication of DLS chain line) information unit; The DLS chain line that the indication simultaneous wheels is ask in the DSIM information unit, or carry the DLS chain line of poll simultaneously in the DLSIDAnnouncement information unit;

AP is through carrying DSIM information unit or DLSIDAnnouncement information unit in DLSID Announcement management frames; The DLS chain line that the indication simultaneous wheels is ask in the DSIM information unit, or carry the DLS chain line of poll simultaneously in the DLSID Announcement information unit;

AP utilize in TIM (Traffic Indication Map, the professional indicator diagram) information unit in the beacon frame with the AID indication in the position of not conflicting carry out the indication of DLS chain line.

Step 304, with after the corresponding STA of this DLS chain line receives polling message, carry out service interaction, accomplish this DLS poll.

Can find out that from above-mentioned flow process AP needs the DLS chain line indication information of poll simultaneously through in polling message, carrying, and makes the STA corresponding with these DLS chain line can carry out service interaction simultaneously, thereby reaches the purpose of DLS being carried out spatial reuse.DLS chain line is to set up in the process of DLS link at STA, is the sign of DLS link assignment by AP.

Below through specific embodiment during to above-mentioned use HCCA the flow process of DLS spatial reuse be elaborated.In the present embodiment, set up the DLS link between SAT-1 and the STA-2, its DLS link is designated DLSID=1; Set up the DLS link between STA-3 and the STA-4, its DLS link is designated DLSID=2; Set up the DLS link between STA-5 and the STA-6, its DLS link is designated DLSID=3.

Setting up the process that DLS connects between STA-1 and the STA-2 can be as shown in Figure 4, and the process of setting up DLS between other STA similarly.

Referring to Fig. 4, be the schematic flow sheet of setting up the DLS link of the embodiment of the invention, concrete steps comprise:

Step 401, STA-1 send DLS to AP and set up request message, and request is set up DLS with STA-2 and is connected.STA-1 can also state whether add the DLS polling list polling table in this request message, STA-1 sets up statement adding DLS polling list polling table in the request message at DLS in the present embodiment.

Can step 402, this DLS link of AP judgement be set up; If can set up (related with AP like STA-2, as allow direct writing stream in this BSS, and STA-2 to be the QoS node); Then be a DLS chain of this DLS link assignment line, DLS chain line is used for unique identification DLS link.The DLS that carries the poll statement that AP sends STA-1 sets up request message and sends to STA-2, in this request message, carries the DLS chain line that AP distributes.

The DLS that STA-1 and AP send in the present embodiment sets up request message format can be as shown in table 3.

Table 3

In proper order	Information
			1	Category
2	Action
		3	Destination?MACAddress
4	Source?MACAddress
		5	Capability?Information
6	DLS?Timeout?Value
		7	Supported?Rates
8	Extended?Supported?Rates
		9	DLSID
10	DLS-Poll?Capability

In the table 3, label is that the territory of 1-8 is that DLS sets up the original territory of request message, and DLSID territory and DLS-Poll Capability territory are the territory that increases newly in the present embodiment.

The DLSID length of field that increases newly is 2 bytes, is used to carry DLS chain line, and DLS chain line is when two STA set up the DLS link, to be distributed to the identifier (length is 2 bytes) of this DLS link by AP; The DLS-Poll Capability length of field that increases newly is 8 bytes, comprises two function informations of DLS Pollable and DLS-Poll request, respectively takies 1 byte, and other byte is reserved byte, and is as shown in table 4.

Table 4

Byte 0	Byte 1	Byte 2-byte 7
			DLS?Pollable	DLS-Poll?request	Reserve

Whether in the table 4, DLS Pollable is used to identify this STA and whether supports the DLS poll, and DLS-Poll request is used to identify the DLS Link State of this STA, promptly state to add the DLS polling list polling table.

The DLS that STA-1 sends sets up in the request message, can select to carry the DLSID territory.

After the DLS that step 403, STA-2 receive the STA-1 that AP transmits sets up request message, judge whether this request of accepting and whether state adding DLS polling list polling table.In the present embodiment, the STA-2 statement adds the DLS polling list polling table.

Step 404, AP judge that STA-1 and STA-2 state adding DLS polling list polling table, then add the DLS polling list polling table with this DLS chain line.Include current effective DLS chain line in the DLS polling list polling table.

The DLS that step 405, AP send STA-2 sets up request responding message and sends to STA-1, and in this response message, carries the DLS chain line that AP distributes, and accomplishes this DLS and sets up process.

The DLS that STA-2 and AP send in the present embodiment sets up the request responding message format can be as shown in table 5.

Table 5

In proper order	Information
			1	Category
2	Action
		3	Status?Code
4	Destination?MACAddress
		5	Source?MACAddress
6	Capability?Information
		7	Supported?Rates
8	Extended?Supported?Rates
		9	DLSID
10	DLS-Poll?Capability

In the table 5, label is that the territory of 1-8 is that DLS sets up the original territory of request message, and DLSID territory and DLS-Poll Capability territory are the territory that increases newly in the present embodiment.

The newly-increased DLSID territory and the implication in DLS-Poll Capability territory are said with table 3.The DLS that STA-2 sends sets up in the request responding message, can select to carry the DLSID territory.

If STA need change polling status, statement added the DLS polling list polling table when for example STA-1 and STA-2 set up the DLS link, and current STA-1 hopes to withdraw from the DLS polling list polling table, then need initiate DLS link establishment process again.In the DLS link establishment process of initiating again, STA-1 carries the current DLS polling status information of this STA in the DLS-Poll Capability territory that the DLS that sends sets up in the request message, and statement does not add polling list polling table.Again initiate DLS link establishment process; Be the process of removing the new DLS link of former DLS link establishment; AP will delete original DLS chain line; If this DLS chain line is arranged in the polling list polling table, then from polling list polling table, delete this DLS chain line, and be new DLS chain line of DLS link assignment that current initiation is set up.

The STA that adds the DLS polling list polling table will be in local maintenance DLS neighbor table separately; The polling status information of this STA and the information of the STA adjacent have been comprised in the DLS neighbor table with this STA; So that report AP, confirm the foundation of poll DLS link simultaneously as AP.If two STA are adjacent, then the signal of one of them STA broadcasting can be received by another STA, and the STA that receives broadcast singal this broadcast singal of can decoding.

STA collects the information of adjacent S TA, safeguards that the process of local DLS neighbor table is:

At contention-free period (CFP); AP sends CF-Poll frame poll STA; The STA that is polled to sends broadcast, and the STA that is adjacent can receive this broadcast, and the STA that receives this broadcast writes this broadcast sender's information the DLS neighbor table of this locality; If there has been this broadcast sender's information in the DLS neighbor table, then no longer repeat to write.For example; In the embodiment of the invention; If STA-1 and STA-2, STA-5, STA-6 are adjacent S TA, STA-3 and STA-4 are adjacent S TA, then when STA-1 is polled to, send broadcast; STA-2, STA-5, STA-6 can receive this broadcast, and in DLS neighbor table separately, add the information of STA-1; , sends STA-2 broadcast when being polled to; STA-1, STA-5, STA-6 can receive this broadcast; And in DLS neighbor table separately, add the information of STA-2; After STA-5, STA-6 are polled to respectively, record the information of STA-2, STA-5, STA-6 in the DLS neighbor table of STA-1; In like manner, comprise the information of STA-4 in the DLS neighbor table of STA-3, comprise the information of STA-3 in the DLS neighbor table of STA-4.

What the STA broadcasting that is polled to was sent can be AID Announcement management frames, and its form can be as shown in table 6.

Table 6

In proper order	Information
			1	Category
2	Action
		3	AID

Category in the table 5 is the frame type sign, and Action is the type of message sign, and AID (Access ID) is the association identification of when the DLS link establishment, being distributed by AP, is used for the STA that unique identification is set up the DLS link.

The STA that receives AID Announcement management frames writes its DLS neighbor table with AID, and DLS neighbours' tableau format can be as shown in table 7.

Table 7

Element ID

Length

DLS-Poll

AID?of Terminal?1

AID?of Terminal?2

……

AID?ofTerminal?n

In the table 7, Element ID is the sign of this information unit, uses 1 byte representation;

Length is the length of this information unit, uses 1 byte representation;

DLS-Poll is the state information of this STA, uses 1 byte representation;

AID of terminal is the AID of adjacent S TA, uses 2 byte representations.

Also can not carry AID in the AID Announcement management frames that the STA that is polled to sends; Like this; The STA that receives this AID Announcement management frames writes its DLS neighbor table with this management frames sender's MAC Address, and DLS neighbours' tableau format can be as shown in table 8.

Table 8

Element ID

Length

DLS-Poll

MAC Address?of Terminal?1

MAC Address?of Terminal?2

……

MACAddress?of Terminal?n

In the table 8, the implication of Element ID, Length, DLS-Poll is with the related definition of table 7, and MACAddress of terminal is and the MAC Address of adjacent S TA, uses 2 byte representations.

The STA that has added the DLS polling list polling table need report AP with DLS neighbor table separately, confirms the basis for estimation of poll DLS link simultaneously as AP.STA can periodic report DLS neighbor table separately, also can when STA has the service needed transmission, report the DLS neighbor table.For example, when STA-1 has service needed when transmission, send and carry the DLS link and be designated 0 message and give AP, expression STA-1 has the service needed transmission, and reports the DLS neighbor table of STA-1.

AP after receiving the professional transmission requests that STA sends, or when the DLS polling cycle arrives, according to the DLS neighbor table that each STA reports, confirm can the while poll the DLS link.

Confirm that the principle of the DLS link of poll is simultaneously: in the DLS link of poll, be not adjacent S TA between pairing STA of each DLS link and the pairing STA of other any one DLS link simultaneously.For example; In the present embodiment; Two DLS links of DLSID=1 and DLSID=2 can be adjacent S TA because the DLS neighbor table that AP reports from STA is learnt STA-1 and STA-2 by the while poll, and STA-3 and STA-4 are adjacent S TA; Can produce signal when like this, two of DLSID=1 and DLSID=2 DLS links carry out service interaction simultaneously hardly disturbs; And two DLS links of DLSID=1 and DLSID=3 just cannot be by the while poll; Because it is adjacent S TA that the DLS neighbor table that AP reports from STA is learnt STA-1, STA-2, STA-5 and STA-6; Like this; If two DLS links of DLSID=1 and DLSID=3 carry out service interaction simultaneously; Because pairing STA-5 of DLS link and the STA-6 of the pairing STA-1 of DLS link, STA-2 and the DLSID=3 of DLSID=1 are adjacent S TA,, disturb these two DLS links if carrying out can producing between the service interaction STA signal simultaneously.

Confirm that according to mentioned above principle the DLS link of poll can have multiple mode simultaneously.For example; Ask earlier by the DLS link at the work station of poll place preferentially by poll; (that is in the DLS link of poll, not adjacent S TA between pairing STA of each DLS link and the pairing STA of other any one DLS link simultaneously, according to mentioned above principle again.) confirm other DLS links of poll simultaneously; Select the DLS link of poll simultaneously at random.

Behind the DLS link of the definite poll simultaneously of AP, need in polling message, carry the indication information of the DLS link of poll simultaneously,, realize the spatial reuse of DLS so that can carry out service interaction simultaneously after making corresponding STA receive this polling message.AP carries in polling message needs the DLS link indication information of poll simultaneously, and following several kinds of modes can be arranged:

Mode one

AP is through carrying DSIM information unit or DLSID Announcement information unit in the beacon frame; And indication needs the DLS link of poll simultaneously in the DSIM information unit, or carries the DLS sign that needs the while poll in the DLSIDAnnouncement information unit.

When AP passed through the DLS link of indication simultaneous wheels inquiry in the DSIM information unit in the beacon frame, the form of DSIM information unit can be as shown in table 9.

Table 9

Element?ID

Length

Partial Virtual Bitmap (1-251 byte)

In the table 9, Partial Virtual Bitmap is used for indicating corresponding D LSID whether business is arranged as the DLSID bitmap; Its each corresponding corresponding D LSID, if certain place value is 1, then the corresponding DLSID of indication has professional mutual; If 0, then the corresponding DLSID of indication does not have professional wanting alternately.

When AP carried the DLS chain line of while poll through the DLSID Announcement information unit in the beacon frame, the form of DLSID Announcement information unit can be as shown in table 10.

Table 10

Element ID

Length

Number of DLSIDs (1 byte)

DLSID1 (2 byte)

……

DLSIDn (2 byte)

In the table 10, the number of the DLSID that Number of DLSIDs representes to carry in this information unit.

For example, simultaneously during poll, its DLSID Announcement information unit can be as shown in table 11 for the DLS link that AP confirms DLSID=1 and DLSID=2.

Table 11

Element?ID

Length

00000010

0000000000000001

0000000000000010

Mode two

AP is through broadcasting DLSID Announcement management frames; In this frame, carry DSIM information unit or DLSID Announcement information unit; In the DSIM information unit, indicate the DLS link of poll simultaneously, or in DLSID Announcement information unit, carry the DLS chain line of poll simultaneously with the DLSID bitmap.The form of DLSID Announcement management frames can be as shown in table 12.

Table 12

In proper order	Information
			1	Category
2	Action
		3	DLSID?Announcement

In the table 12, Category representes frame type, and this is a DLSID Announcement management frames; Action representes type of message; The structure of DLSID Announcement information unit is as shown in table 9.

Mode three

AP utilizes the position of not conflicting with the AID indication in the TIM information unit in the beacon frame, indicates the DLS of poll simultaneously as the DLSID bitmap.The form of TIM information unit can be as shown in table 13.

Table 13

Element ID

Length

DTIM Count

DTIM?Period

Bitmap?Control

Partial?Virtual?Bitmap (1-251bytes)

In the table 13, some byte is system's reserved byte among the Partial Virtual Bitmap, can use these bytes as the DLSID bitmap, and indication is the DLSID of poll simultaneously.Whether the byte indication corresponding D LSID with reserving among the Partial Virtual Bitmap has business; The corresponding corresponding D LSID of each of its DLSID bitmap, if certain place value is 1, then the corresponding DLSID of indication has professional mutual; If 0, then the corresponding DLSID of indication does not have professional wanting alternately.

Embodiment two

Present embodiment has been described under the situation of a plurality of Traffic Channels, and AP confirms the DLS link of poll simultaneously, realizes a plurality of DLS links of poll simultaneously, makes corresponding many processes that STA realized service interaction through the DLS link.

Referring to Fig. 5, be the schematic flow sheet of the embodiment of the invention two, concrete steps comprise:

When step 501, AP need poll DLS link,, confirm the quantity of the DLS link of poll simultaneously according to current available channel quantity, and for these can the while poll the used Traffic Channel of DLS link assignment.

AP safeguards a traffic channel state table, the current busy-idle condition of this each Traffic Channel of traffic channel state table record.Notify AP when STA accomplishes at service interaction after getting back to main channel, AP be the free time with the state recording of this channel then, and perhaps AP also can be according to the busy-idle condition of each DLS link at the mutual time record traffic channel of Traffic Channel.When STA initiates service request or when polling cycle arrived, AP inquiry business Channel Status Table according to the Traffic Channel quantity of current idle condition, was confirmed that the DLS link of equal number carries out poll, and is the channel of each DLS link assignment one idle condition.For example, the current Traffic Channel that 3 idle conditions are arranged of traffic channel state table, then AP confirms DLSID=1,3 DLS links of 2,3 can be simultaneously by poll, and gives this 3 DLS links with the traffic channel assignments of these 3 idle conditions.The method of salary distribution can be Random assignment, also can be to wait other modes by the quality of service distribution.

Step 502, AP send polling message, wherein carry the indication information of the DLS link of poll simultaneously, and the traffic channel information of assignment.

With embodiment one, AP is the DLS link of indication simultaneous wheels inquiry in polling message in several ways, comprising:

AP is through carrying DSIM information unit or DLSID Announcement information unit in the beacon frame; The DLS chain line that the indication simultaneous wheels is ask in the DSIM information unit, or carry the DLS chain line of poll simultaneously in the DLSIDAnnouncement information unit;

AP utilize in the TIM information unit in the beacon frame with the AID indication in the position of not conflicting carry out the indication of DLS chain line.

AP can also indicate the mutual time of STA to the used traffic channel information of the pairing STA indication of the DLS link of each while poll.Preferable, traffic channel information indication and/or mutual time indication are included in the polling message.For example,

AP can in the DSIM information unit, be included as the service interaction time of each DLS link assignment or/and Traffic Channel number is as shown in table 14:

Table 14

Element ID

Length

Partial Virtual Bitmap

Channel ID1

…

Channel IDn

Period1

…

Periodn

In the table 14, Channel ID is that AP is the Traffic Channel number of DLS link assignment, and Period is that AP is the service interaction time of DLS link assignment, also can not carry Period in this DSIM information unit, and is specified through other message by AP.

AP can also in DLSID Announcement information unit, be included as the service interaction time of each DLS link assignment or/and Traffic Channel number is as shown in Tble 15:

Table 15

Element ID

Length

DLSID1-DLSIDn (each DLSID accounts for 2 bytes)

?Channel?ID1

…

Channel IDn

Period1

…

Periodn

In the table 15, Channel ID is that AP is the Traffic Channel number of DLS link assignment, and Period is that AP is the service interaction time of DLS link assignment.Also can not carry Period in this DSIM information unit.

Step 503, with after the corresponding STA of this DLS chain line receives polling message, it is mutual to be engaged in the enterprising industry of corresponding channel, accomplishes this DLS poll.

If carry traffic channel information and mutual temporal information in the polling message; Then had between the professional STA that will be mutual and consult the mutual time by the indication of the DLS chain line in the broadcast of AP transmission; And be transformed into the corresponding business channel simultaneously and carry out service interaction; STA accomplishes back or mutual time at service interaction and returns main channel, the service status table of AP renewal simultaneously after overtime.

DLS chain line in the above-mentioned flow process of present embodiment is to set up in the process of DLS link at STA; By AP is the sign of DLS link assignment; And be recorded in the DLS polling list polling table, the process of setting up of DLS link repeats no more at this with the DLS link establishment process described in the embodiment one.

Can find out from above-mentioned flow process; AP is through assigning to different DLS links on the different service channel; And in polling message, carry and need the DLS chain line indication information of poll simultaneously; It is mutual that the STA corresponding with these DLS chain line can be engaged in the enterprising industry of different service channel simultaneously, thereby reach the purpose of DLS being carried out spatial reuse.

Embodiment three

Present embodiment has been described under the situation of a plurality of Traffic Channels; The relation information of the neighbours STA that AP reports according to available Traffic Channel quantity and STA; Confirm the DLS link of poll simultaneously; Realize a plurality of DLS links of poll simultaneously, make corresponding many processes that STA realized service interaction through the DLS link.

Referring to Fig. 6, be the schematic flow sheet of the embodiment of the invention three, concrete steps comprise:

Step 601, AP receive the DLS neighbor table that each STA reports.The information that includes the adjacent STA of the owner STA of this DLS neighbor table in the DLS neighbor table is like AID or the MAC Address of adjacent S TA.

Step 602, when AP needs poll DLS link, according to current available channel quantity and the DLS neighbor table that each STA reports, confirm the DLS link of poll simultaneously.

AP safeguards a traffic channel state table, the current busy-idle condition of this each Traffic Channel of traffic channel state table record.Notify AP when STA accomplishes at service interaction after getting back to main channel, AP be the free time with the state recording of this channel then, and perhaps AP also can be according to the busy-idle condition of each DLS link at the mutual time record traffic channel of Traffic Channel.

When STA initiates service request or when polling cycle arrives, AP inquiry business Channel Status Table obtains the quantity of current available Traffic Channel.AP confirms the DLS link of poll simultaneously according to the quantity of the Traffic Channel of free time; And the adjacent work station information that reports according to each STA confirm respectively can with these DLS links DLS link of polls simultaneously, with every group simultaneously the DLS link of poll be assigned to respectively on the Traffic Channel of a plurality of free time.

For example, the Traffic Channel quantity of current idle condition is 2, and AP confirms DLSID=1; 2 DLS link is poll simultaneously, and AP also obtains DLSID=2 according to the DLS neighbor table that each STA reports, in 2 DLS links of 3; The STA that the STA that each DLS link is corresponding is not corresponding with other DLS link is adjacent; In like manner can confirm DLSID-1,2 DLS links of 4 are poll simultaneously also, therefore; AP can be with 2 DLS link assignment to 1 Traffic Channels of DLSID=2 and DLSID=3, with 2 DLS link assignment of DLSID=1 and DLSID=4 on another Traffic Channel.

Step 603, AP send polling message, wherein carry the indication information of the DLS link of poll simultaneously, and the traffic channel information of assignment.

With embodiment two, AP can also indicate mutual time of STA and/or used traffic channel information in polling message.

Step 604, with after the corresponding STA of this DLS chain line receives polling message, it is mutual to be engaged in the enterprising industry of corresponding channel, accomplishes this DLS poll.

If carry mutual temporal information in the polling message; Then had between the professional STA that will be mutual and consult the mutual time by the indication of the DLS chain line in the broadcast of AP transmission; And be transformed into the corresponding business channel simultaneously and carry out service interaction; STA accomplishes back or mutual time at service interaction and returns main channel, the service status table of AP renewal simultaneously after overtime.

Can find out from above-mentioned flow process; AP confirms the DLS of poll simultaneously according to the neighborhood that current available Traffic Channel quantity and STA report; And through in polling message, carrying the DLS chain line indication information that needs the while poll; Make the STA corresponding can carry out service interaction simultaneously, thereby reach the purpose of DLS being carried out spatial reuse with these DLS chain line.

The embodiment of the invention also provides a kind of work station of the DLS of support mechanism.

Referring to Fig. 7, be the work station structural representation of the embodiment of the invention, this work station is supported DLS mechanism, specifically comprises: DLS request sending module, DLS response receiver module, neighbor information reporting module, poll receiver module and service interaction module.

DLS responds receiver module; Be used to receive the DLS that sends to the DLS request sending module by the above-mentioned purpose work station of controlling the access point forwarding and set up the response message that request message returns; Carry the claim information of purpose work station adding DLS polling list polling table in the response message, and the control access point is the DLS chain line of this DLS link assignment.

The neighbor information reporting module is used for to controlling the adjacent work station information that access point reports this work station.

The poll receiver module; Be used to receive the polling message that the control access point sends; The DLS link that the indication simultaneous wheels is ask in this polling message, the DLS link of said while poll are to be confirmed according to the said adjacent work station information that said neighbor information reporting module reports by said control access point;

The service interaction module; Be used for receiving polling message at the poll receiver module; And when the DLS chain line that the indicated DLS chain line of this polling message and the DLS response receiver module of this work station receive is identical, carry out service interaction through said DLS link and opposite end purpose work station.

This work station also can comprise the neighbor information collection module:

The neighbor information collection module is used to receive the broadcast that adjacent work station that the Be Controlled access point is polled to sends, and writes down this broadcast sender's information;

The neighbor information reporting module is given the control access point with the broadcast sender's of neighbor information collection module record information reporting.

In the above-mentioned work station structure, DLS request sending module and DLS response receiver module also can be integrated into a module, are used for realizing DLS link establishment process and the information interaction of controlling access point.

The embodiment of the invention also provides two kinds of control access points.

Referring to Fig. 8, be the control access point apparatus structural representation of inventive embodiments, this control access point apparatus is supported DLS mechanism.This control access point apparatus comprises: neighbor information receiver module, DLS poll determination module and polling message sending module.

The neighbor information receiver module is used for the adjacent work station information of this work station that receiving workstation reports;

DLS poll determination module, the adjacent work station information of this work station that is used for reporting according to work station is confirmed the DLS link of poll simultaneously;

The polling message sending module is used to send polling message, and in this polling message, indicates the DLS link of poll simultaneously.The polling message sending module carries the sign of the DLS link of poll simultaneously in the polling message that sends; Perhaps; Carry DLS link indicator figure, the corresponding corresponding D LS chain of each of this bitmap line, and through the corresponding DLS link of each place value indication of this bitmap whether by poll.

This control access point also can comprise the DLS request processing module:

The DLS that the DLS request processing module is used for the receiving workstation initiation sets up request and sets up the DLS link according to this request; And DLS link assignment DLS chain line for setting up; Add the claim information of DLS polling list polling table according to the work station of initiation request and target work station, this DLS chain line is added the DLS polling list polling table.

Referring to Fig. 9, be the control access point apparatus structural representation of inventive embodiments, this control access point apparatus is supported DLS mechanism.This control access point apparatus comprises: traffic channel state acquisition module, DLS poll determination module and polling message sending module.

This control access point apparatus also can comprise the DLS request processing module:

The DLS that the DLS request processing module is used for the receiving workstation transmission sets up request and sets up the DLS link according to this request; And DLS link assignment DLS chain line for setting up; When asking work station and purpose work station all to state adding DLS polling list polling table, said DLS chain line is added the DLS polling list polling table.

This control access point apparatus also can comprise the neighbor information receiver module:

The neighbor information receiver module is used for the adjacent work station information that receiving workstation sends;

DLS poll determination module is confirmed the DLS link of poll simultaneously according to the quantity of the Traffic Channel of current free time; And according to adjacent work station information confirm respectively can with these DLS links DLS link of polls simultaneously, with every group simultaneously the DLS link of poll be assigned to respectively on the Traffic Channel of current free time.

The polling message sending module of this control access point apparatus also can carry DLS poll determination module in polling message be the traffic channel information of DLS link assignment.

This control access point apparatus also can comprise mutual time indicating module:

Mutual time indicating module is used to the mutual time of DLS link assignment, and the mutual temporal information that will distribute sends to the polling message sending module; The polling message sending module is carried on mutual temporal information in the polling message and sends.

In sum; Control access point in the embodiment of the invention is through the information of its adjacent work station of receiving the work station added the DLS polling list polling table and reporting; And with this as confirming the foundation of the DLS link of poll simultaneously; When carrying out the DLS poll, confirm the DLS link of poll simultaneously according to the neighbouring relations between each work station that acquires, in the polling message of broadcasting, carry and confirm as the indication information of the DLS link of poll simultaneously; Make with the corresponding work station of DLS link of these while polls and can carry out the DLS service interaction simultaneously, thereby realize the spatial reuse of DLS.Embodiments of the invention also can confirm that the DLS link of equal number carries out the while poll according to the Traffic Channel quantity of current free time, thereby realize the spatial reuse of DLS.In a word, embodiments of the invention have solved in the prior art after a plurality of DLS link establishments, can only have the corresponding a pair of work station of a DLS link to carry out the problem of service interaction at every turn, and then have improved DLS mechanism space availability ratio.And, because the control access point is confirmed the DLS link of poll simultaneously, the interference in the time of can reducing the DLS service interaction between each work station according to the neighbouring relations of each work station as far as possible.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a direct link is set up the DLS method for spacial multiplex, it is characterized in that, comprises the steps:

2. DLS method for spacial multiplex as claimed in claim 1 is characterized in that, before the DLS of said definite while poll link, also comprises and sets up said DLS link, and the identification information of said DLS link is added the process of DLS polling list polling table;

Set up said DLS link and said DLS link identification information added the process of said DLS polling list polling table, comprising:

Said work station is initiated DLS to the control access point and is set up request, and request is set up the DLS link with the purpose work station, and sends the claim information that adds said DLS polling list polling table to said control access point;

Said control access point is said DLS link assignment DLS chain line, and after the claim information of receiving the adding DLS polling list polling table that said purpose work station returns, and the sign of said DLS link is added said DLS polling list polling table.

3. DLS method for spacial multiplex as claimed in claim 1 is characterized in that, according to the Traffic Channel quantity of current free time, confirms that the DLS link of poll comprises simultaneously:

According to the Traffic Channel quantity of current free time, confirm that the DLS link of equal number carries out poll simultaneously, and said DLS link is assigned to respectively on the Traffic Channel of current free time.

4. DLS method for spacial multiplex as claimed in claim 3 is characterized in that, carries the traffic channel information of promising each said DLS link assignment in the said polling message;

After the corresponding work station of said DLS link receives said polling message, be transformed into the corresponding business channel and carry out service interaction.

5. DLS method for spacial multiplex as claimed in claim 4 is characterized in that, also carries the mutual temporal information of promising each said DLS link assignment in the said polling message;

After the corresponding work station of said DLS link receives said polling message, corresponding mutual temporal information indicated during in carry out service interaction through said DLS link.

6. DLS method for spacial multiplex as claimed in claim 1 is characterized in that, the DLS link of the said while poll of indication in said polling message comprises:

In said polling message, carry the sign of the DLS link of said while poll;

Perhaps, in said polling message, carry the bitmap of DLS chain line, the corresponding corresponding D LS chain of each of said bitmap line, and whether belong to the DLS link of poll simultaneously through each the corresponding DLS link of value indication of said bitmap.

7. a work station of supporting DLS is characterized in that, comprising:

8. work station as claimed in claim 7 is characterized in that, also comprises:

The neighbor information collection module is used to receive the broadcast of the adjacent work station transmission that is polled to, and writes down the information of this adjacent work station;

Said neighbor information reporting module sends to said control access point with the said adjacent work station information of said neighbor information collection module record.

9. a control access point apparatus is characterized in that, comprising:

10. control access point apparatus as claimed in claim 9; It is characterized in that; Carry the sign of the DLS link of poll simultaneously in the polling message that said polling message sending module is sent, perhaps, carry DLS link indicator figure; The corresponding corresponding D LS chain of each of said bitmap line, and through the corresponding DLS link of each place value indication of said bitmap whether by poll.

11. control access point apparatus as claimed in claim 9 is characterized in that, said control access point apparatus also comprises:

The DLS request processing module; The DLS that is used for the receiving workstation transmission sets up request and sets up the DLS link according to this request; And DLS link assignment DLS chain line for setting up; When asking work station and purpose work station all to state adding DLS polling list polling table, said DLS chain line is added the DLS polling list polling table.

12. a control access point apparatus is characterized in that, comprising:

13. control access point apparatus as claimed in claim 12 is characterized in that, said control access point apparatus also comprises:

14. control access point apparatus as claimed in claim 12 is characterized in that, said polling message sending module carries said DLS poll determination module in said polling message be the traffic channel information of said DLS link assignment.

15., it is characterized in that said control access point apparatus also comprises like claim 12 or 14 described control access point apparatus:

Mutual time indicating module be used to the said mutual time of DLS link assignment, and the mutual temporal information that will distribute sends to said polling message sending module; Said polling message sending module is carried on said mutual temporal information in the said polling message and sends.