CN104219017A - A method for transmitting a data packet in a physical layer and an access point - Google Patents

Abstract

Embodiments of the invention disclose a method for transmitting a data packet in a physical layer and an access point. The method for transmitting a data packet in a physical layer comprises: an access point monitors a channel state and contends for a transmission channel; in the case that the access point has contended for the transmission channel, the access point sends a frame header of a physical protocol data unit(PPDU) to a local station over the contended transmission channel; and the access point waits for interval duration after sending the frame header of the PPDU, and sends a physical service data unit(PSDU) to the local station after the interval duration. The technical solution provided according to the embodiments of the invention can realize discontinuous transmission of the PPDU and the PSDU, such that it becomes possible to prevent frame headers of PPDUs from conflicting with one another in the case that each coordination AP simultaneously transmits the PSDU.

Description

A kind of physical layer data package transmission method and access node

Technical field

The present invention relates to communication field, particularly relate to a kind of physical layer data package transmission method and access node.

Background technology

Along with the development of communication correlation technique, based on IEEE-USA (IEEE, Institute of Electrical and Electronics Engineers) WLAN (WLAN, the Wireless Local Area Networks) technology of 802.11 standards is widely used.Nowadays, the popularity rate of portable computer, smart mobile phone is more and more higher, and these intelligent terminals all support WLAN technology substantially.Meanwhile, wireless mobile communications business has turned to multimedia service gradually from voice and text services, and traffic needs is increasing.Current WLAN technology is faced with the good opportunity of great development.On the one hand, the existing network of mobile operator is difficult to carrying googol according to service traffics, needs wlan network effectively to shunt; On the other hand, the expense that wlan network is cheap attracts increasing user, and to select wlan network to carry out data service mutual.But being seen everywhere of WLAN business, what bring is the day by day congested of WLAN frequency range.Wlan network uses unlicensed frequency range (namely exempting to authorize frequency range).The frequency range of this opening is difficult to obtain service quality (QoS, Quality of Service) guarantee in frequency spectrum use, and frequency spectrum resource is limited.This proposes very high requirement to the interference management techniques of wlan network and frequency spectrum service efficiency.Current, the development of wlan network technology and evolution are mainly to promote frequency spectrum service efficiency and interference management ability for main target.

Along with the development of wireless communication technology, the WLAN of some focus scenes as airport, court and the shopping centre that the crowd is dense etc. arranges net intensive, can produce mutual interference between different access points (AP, Access Point).Combined Treatment technology between multiple AP of introducing carry out AF panel or cooperation transmission imperative.Multiple AP Combined Treatment needs to align to the data initial time of these AP, namely sends data between cooperation AP simultaneously.But, in order to compatible conventional terminal equipment, when physical layer for transmission packet, part field in physical layer protocol data unit (PPDU, Physical Protocol Data Unit) frame head can not carry out precoding processing, therefore, for the AP cooperated with each other, even if their data field can adopt Combined Treatment technology to send simultaneously, their some or all of PPDU frame head also must separately send, and namely only has an AP can send PPDU frame head at every turn.But, due in the PPDU form that defines at existing standard, PPDU frame head and physical layer service data (PSDU, Physical Service Data Unit) be continuous print, therefore, want to transmit PSDU, PPDU frame head also will inevitably be transmitted simultaneously simultaneously, this will cause the mutual conflict of PPDU frame head, thus the data causing AP to send normally cannot be received by website.

Summary of the invention

Various aspects of the present invention provide a kind of physical layer data package transmission method and access node, and for realizing the discontinuous transmission of PPDU and PSDU, to make when each cooperation AP transmits PSDU simultaneously, ensureing that PPDU frame head does not conflict mutually becomes possibility.

For solving the problems of the technologies described above, provide following technical scheme:

First aspect present invention provides a kind of transmission method of physical layer data bag, comprising:

Access node monitor channel state also competes transmission channel;

When described access node competes transmission channel: described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local;

Interval duration is waited for after sending described PPDU frame head; Send physical layer service data PSDU to described site-local afterwards.

Based on first aspect present invention, in the implementation that the first is possible, described access node only has a cooperation access node;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, also comprise before:

Schedule information mutual with cooperation access node;

According to the schedule information of described cooperation access node, estimate that described cooperation access node sends the duration required for PPDU frame head;

The duration that described cooperation access node sends required for PPDU frame head is added 1 short frame pitch SIFS, obtains described interval duration.

Based on the first possible implementation of first aspect present invention or first aspect, in the implementation that the second is possible, described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, also comprise before:

Send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, comprising:

The website associated with described cooperation access node if listen to described cooperation access node send allow to send protocol message time, wait for some cooperation frame pitch PIFS, afterwards described access node described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

Based on the first possible implementation of first aspect present invention, in the implementation that the third is possible, also comprise after competing transmission channel in described access node monitor channel state:

If described access node had listened to other access node and sent PPDU frame head before competition to transmission channel, then:

Detect the cooperation access node whether other access node described is described access node,

If other access node described is the cooperation access node of described access node, then after other access node described sends PPDU frame head, wait for a SIFS, the transmission channel that described access node uses other access node described to compete afterwards sends PPDU frame head and PSDU to site-local.

Based on the first possible implementation of first aspect present invention, in the 4th kind of possible implementation, in described access node monitor channel state and after competing transmission channel, described method also comprises:

If described access node had listened to cooperation access node and sent request transmission protocol message before competition to transmission channel, then:

Listen to the website that associates with described cooperation access node to described cooperation access node send allow to send protocol message time, wait for a SIFS, send with site-local interaction request/allow afterwards and send protocol message;

Listening to after described cooperation access node sends PPDU frame head, wait for a SIFS, the transmission channel that described access node uses described cooperation access node to compete afterwards sends PPDU frame head and PSDU to site-local.

Based on first aspect present invention, in the 5th kind of possible implementation,

There is N number of cooperation access node in described access node, wherein, N is greater than 1;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local before, comprising:

With the mutual schedule information of described N number of cooperation access node, wherein, the schedule information of each cooperation access node comprises: need the number of the long training field of carrying and the PPDU cooperation order of transmission of this cooperation access node in the PPDU frame head that this cooperation access node is to be sent;

According to the number of the long training field needing in the PPDU frame head that each cooperation access node is to be sent to carry, estimate that each cooperation access node sends the duration required for PPDU frame head;

To cooperate order of transmission and formula according to the PPDU of described access node and described N number of cooperation access node ${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head.

Based on the 5th kind of possible implementation of first aspect present invention, in the 6th kind of possible implementation, described access node monitor channel state also after competing transmission channel, also comprises:

If described access node had listened to other access node and sent PPDU frame head before competition to transmission channel, then:

Detect the cooperation access node whether other access node described is described access node,

If other access node described is the cooperation access node of described access node, then:

Be, after the cooperation access node of i-1 sends PPDU frame head, waits for a SIFS at the PPDU order of transmission that cooperates, afterwards described access node use other access node described to compete transmission channel to site-local transmission PPDU frame head;

While at PPDU cooperation order of transmission being the cooperation access node transmission PSDU of 1, the transmission channel using other access node described to compete sends PSDU to site-local.

Based on the 5th kind of possible implementation of first aspect present invention, in the 7th kind of possible implementation, described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, also comprise before:

To cooperate order of transmission and formula according to the PPDU of described access node and described N number of cooperation access node ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

Send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, comprising:

The order of transmission that to cooperate with PPDU if listen to is that website that the cooperation access node of N+1 associates sends when allowing to send protocol message, waits for described BPB _i, afterwards described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

Based on the 5th kind of possible implementation of first aspect present invention, in the 8th kind of possible implementation, after the mutual schedule information of described and described N number of cooperation access node, comprising:

To cooperate order of transmission and formula according to the PPDU of described access node and described N number of cooperation access node ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i;

Described in described access node monitor channel state and after competing transmission channel, if described access node had listened to cooperation access node before competition to transmission channel send request transmission protocol message, then described method has also comprised:

When listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send allow to send protocol message time, send with site-local interaction request/allow and send protocol message;

If described i is more than or equal to 1 and is less than N+1, then: listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send allow to send protocol message time, wait for described BPB _i; The transmission channel competed at cooperation access node afterwards sends PPDU frame head to described site-local; Wait for described BPA afterwards _i; At the described BPA of wait _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local;

If described i equals N+1, then: after sending/allow send protocol message with described site-local interaction request, wait for described BPB _i; At the described BPB of wait _iafter, the transmission channel that cooperation access node is competed sends PPDU frame head to described site-local; Wait for described BPA afterwards _i; At the described BPA of wait _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local.

Based on the third possible implementation of first aspect present invention or the 6th kind of possible implementation of first aspect, in the 9th kind of possible implementation, whether other access node described in described detection is the cooperation access node of described access node, comprising:

The cooperation identification information carried in the PPDU frame head sent by other access node described identifies other access node described, differentiate that whether other access node described is the cooperation access node of described access node with this, wherein, described cooperation identification information is used for mark access node.

Second aspect present invention provides a kind of access node, comprising:

Monitoring unit, for monitor channel state;

Competitive unit, for competing transmission channel;

Transmit-Receive Unit, sends physical layer protocol data unit PPDU frame head to site-local on the transmission channel competed in described competitive unit; After sending described PPDU frame head, wait for interval duration, send PSDU to described site-local afterwards.

Based on second aspect present invention, in the implementation that the first is possible, described access node only has 1 cooperation access node;

Described access node also comprises:

Interactive unit, for the mutual schedule information of described cooperation access node;

Acquiring unit, for the schedule information of described cooperation access node obtained according to described interactive unit, estimates that described cooperation access node sends the duration required for PPDU frame head; The duration that described cooperation access node sends required for PPDU frame head is added 1 short frame pitch SIFS, obtains described interval duration.

Based on the first possible implementation of second aspect present invention or second aspect present invention, in the implementation that the second is possible, described Transmit-Receive Unit also for: send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message; Described monitoring unit listen to the website associated with described cooperation access node send allow to send protocol message time, wait for some cooperation frame pitch PIFS, afterwards described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

Based on the first possible implementation of second aspect present invention, in the implementation that the third is possible, described access node also comprises:

Detecting unit: for listened to before described competitive unit competes transmission channel when described monitoring unit other access node send PPDU frame head time, detect the cooperation access node whether other access node described is described access node;

Described Transmit-Receive Unit also for: when the testing result of described detecting unit is for being, after other access node described sends PPDU frame head, wait for a SIFS, the transmission channel using other access node described to compete afterwards sends PPDU frame head and PSDU to site-local.

Based on the first possible implementation of second aspect present invention, in the 4th kind of possible implementation, described Transmit-Receive Unit also for: when described monitoring unit listened to before described competitive unit competes transmission channel the website associated with described cooperation access node send allow to send protocol message time, wait for a SIFS, send with site-local interaction request/allow afterwards and send protocol message; Listen to after described cooperation access node sends PPDU frame head at described monitoring unit, wait for a SIFS, the transmission channel using described cooperation access node to compete afterwards sends PPDU frame head and PSDU to site-local.

Based on second aspect present invention, in the 5th kind of possible implementation, there is N number of cooperation access node in described access node, wherein, N is greater than 1;

Described access node also comprises:

Interactive unit, for with the mutual schedule information of described N number of cooperation access node, wherein, the schedule information of each cooperation access node comprises: need the number of the long training field of carrying and the PPDU cooperation order of transmission of this cooperation access node in the PPDU frame head that this cooperation access node is to be sent;

Acquiring unit, for:

Need the number of the long training field of carrying in the PPDU frame head that each cooperation access node obtained according to described interactive unit is to be sent, estimate that each cooperation access node sends the duration required for PPDU frame head;

The PPDU cooperation order of transmission of the access node obtained according to described interactive unit and described N number of cooperation access node, and formula ${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head.

Based on the 5th kind of possible implementation of second aspect present invention, in the 6th kind of possible implementation, described access node also comprises:

Detecting unit: for listened to before described competitive unit competes transmission channel when described monitoring unit other access node send PPDU frame head time, detect the cooperation access node whether other access node described is described access node;

Described Transmit-Receive Unit also for: when the testing result of described detecting unit is for being, be that the cooperation access node of i-1 sends PPDU frame head and after waiting for a SIFS, the transmission channel using other access node described to compete sends PPDU frame head to site-local at the PPDU order of transmission that cooperates; While at PPDU cooperation order of transmission being the cooperation access node transmission PSDU of 1, the transmission channel that other access node described is competed sends PSDU to site-local.

Based on the 5th kind of possible implementation of second aspect present invention, in the 7th kind of possible implementation, described acquiring unit also for:

The PPDU cooperation order of transmission of the described access node obtained according to described interactive unit and described N number of cooperation access node, and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

Described Transmit-Receive Unit also for: send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message; When listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send allow to send protocol message time and waiting for described BPB _iafter, described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

Based on the 5th kind of possible implementation of second aspect present invention, in the 8th kind of possible implementation, described acquiring unit also for:

The PPDU cooperation order of transmission of the described access node obtained according to described interactive unit and described N number of cooperation access node, and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i;

If described i is more than or equal to 1 and is less than N+1, described Transmit-Receive Unit also for: when described monitoring unit listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send allow to send protocol message time, send with site-local interaction request/allow and send protocol message; Described monitoring unit listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send allow to send protocol message time, wait for described BPB _i, the transmission channel competed at cooperation access node afterwards sends PPDU frame head to described site-local; Wait for described BPA more afterwards _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local;

If described i equals N+1, described Transmit-Receive Unit also for: when listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send allow to send protocol message time, send with site-local interaction request/allow and send protocol message; Send protocol message in the permission receiving described site-local and wait for described BPB again _iafter, the transmission channel that cooperation access node is competed sends PPDU frame head to described site-local; Sending PPDU frame head and waiting for described BPA _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local.

Based on the third possible implementation or the 6th kind of possible implementation of second aspect present invention, in the 9th kind of possible implementation, described detecting unit specifically for: the cooperation identification field of carrying in the PPDU frame head sent by described other access node identifies other access node described, differentiates that whether other access node described is the cooperation access node of described access node with this.

Therefore, interval duration is introduced in the embodiment of the present invention, achieve the discontinuous transmission of PPDU and PSDU, in addition, by the control to interval duration, can make before each AP transmits PSDU at the same time, to transmit separately respective PPDU frame head at different time points, mutually conflict with the PPDU frame head that this is avoided each cooperation AP to transmit, improve the reliability of transfer of data.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is a kind of physical layer data pack arrangement schematic diagram provided by the invention;

Fig. 2-a is transmission method embodiment schematic flow sheet of physical layer data bag provided by the invention;

Fig. 2-b is a kind of primary channel access rules schematic diagram provided by the invention;

Fig. 3 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Fig. 4 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Fig. 5 is a kind of link structure schematic diagram provided by the invention;

Fig. 6 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Fig. 7 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Fig. 8 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Fig. 9 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Figure 10 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Figure 11 is another embodiment schematic flow sheet of transmission method of physical layer data bag provided by the invention;

Figure 12 is access node provided by the invention example structure schematic diagram;

Figure 13 is another example structure schematic diagram of access node provided by the invention;

Figure 14 is another example structure schematic diagram of access node provided by the invention;

Figure 15 is another example structure schematic diagram of access node provided by the invention.

Embodiment

Embodiments provide a kind of physical layer data package transmission method and access node.

For making goal of the invention of the present invention, feature, advantage can be more obvious and understandable, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, and not all embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making each other embodiments obtained under creative work prerequisite, belong to the scope of protection of the invention.

First the physical layer data bag in the embodiment of the present invention is introduced.In IEEE802.11WLAN standard, physical layer data pack arrangement as shown in Figure 1, be made up of PPDU frame head and PSDU, wherein, PPDU frame head contains Short Training field (i.e. Shot training field), long training field (long training field) and signaling territory (i.e. signal field); Data field (i.e. Data field) constitutes the load of PSDU.Short Training field is used for detection when physical layer data unwraps the beginning and automatic growth control (AGC, Automatic Gain Control) arrange, and initial frequency drift is estimated and initial time synchronization, long training field is mainly used in channel estimating and more accurate Frequency offset estimation and time synchronized, and signaling territory contains speed and the length information of this physical layer data bag.

Below the transmission method of the physical layer data bag that the embodiment of the present invention provides is described, for ease of describing, an AP is concentrated to be described as executive agent using cooperation AP in the embodiment of the present invention, and other AP that cooperation AP concentrates is described as cooperation AP, wherein, all AP built vertical cooperation relation each other that above-mentioned cooperation AP is concentrated.Refer to Fig. 2-a, the transmission method of the physical layer data bag in the embodiment of the present invention comprises:

201, AP monitor channel state compete transmission channel;

IEEE802.11 provides the most basic channel access rule, as shown in Fig. 2-b, different frame pitch, as short frame pitch (SIFS, Short Inter-Frame Space), some cooperation frame pitch (PIFS, Point Coordinator Inter-Frame Space) and distributed cooperation frame pitch (DIFS, Distributed Coordination Function Inter-Frame Space) provide different channel prior access grades.

SIFS is used for separating needs the frame of response and the response frame of this frame, and as Frame and confirmation (ACK, Acknowledgement) response, request sends (RTS, Request to Send) and allows to send (CTS, Clear to Send) response.The design of SIFS need meet various time of delay of rationally realizing under prerequisite as far as possible short, to reduce unnecessary overhead, cause waste.These time of delays comprise: the start-up time in the decoding delay of the frame in physical layer received by demodulation, medium education, the processing delay of received frame, the time of setting up response frame and transmitter being sent to response.The SIFS duration of a specific physical layer (PHY, PHYsical Layer) is defined by aSIFSTime parameter.For the PHY of 802.11a, 802.11g and 802.11n, this value is 16 microseconds.

The duration of other frame pitch (IFS, Inter-Frame Space) is the slot length (i.e. Slot time) that SIFS adds integral multiple, and transmission time starts at time slot edge.The slot length duration of a specific PHY is defined by aSlotTime parameter.For the PHY of 802.11a, 802.11g and 802.11n, this value is 9 microseconds.

PIFS provides the access priority being only second to SIFS, and is used to obtain the priority access to channel.PIFS is defined as PIFS=aSIFSTime+aSlotTime.To prolong to obtain to the access of channel to send beacon after AP PIFS, start a uncontended periods, or regain the access of channel when not receiving the response frame of expectation in a uncontended periods.

DIFS is by the website run under distributed coordination function (DCF, Distributed Coordination Function) in order to transmitting data frame and management frames, and it is defined as DIFS=aSIFSTime+2 × aSlotTime.If channel is as the free time to use the website of DCF to judge in DIFS duration, or after it correctly receives a frame, then to judge after DIFS remaining whether keep out of the way channel in duration idle in continuation.If idle, then access channel and transmit.

When channel from busy transfer the free time to time, multiple website (STA, Station) may be had all set will to send data simultaneously.In order to collision conflict is reduced to minimum, want the website of initiating transmission to select random back counting, then keep out of the way after length is carried out prolong according to this.Random back counting is the pseudo-random integer chosen in being uniformly distributed on interval [0, CW].Here CW becomes competition window (Contention Window).The initial value of CW parameter is taken as CWmin, and then doubles after each unsuccessful Medium Access Control (MAC) Protocol Data Unit (MPDU, MAC protocol data unit) transmission.Such as, when not receiving the ACK frame corresponding to a Frame, CW value just becomes original twice at every turn.If CW value reaches the maximum CWmax of default, then keep this value, until be reset always.CW is again set to CWmin after each successfully transmission MPDU.CW, CWmin and CWmax can obtained value be 2 power subtract 1.Value for DCF, CWmin and CWmax is specified according to used PHY.Value for the PHY of 802.11a, 802.11g and 802.11n, CWmin is the value of 15, CWmax is 1023.The value of such CW, from 15, is then got the next power of higher 2 and is subtracted 1, until 1023 after the unsuccessful transmission of each MPDU.

Start a stochastic backoff process, first website chooses a random back counting in [0, CW] scope.After DIFS duration, if channel is judged as the free time in DIFS duration, then the backoff period of all STA all starts counting.If channel becomes busy in a backoff period, then backoff procedure is suspended.If channel again becomes the free time in a DIFS duration, then keep out of the way counting and continue to start counting.When multiple website prolongs and enters random back counting after carrying out, select to keep out of the way the minimum website of count value, then the AP associated by this website wins competition and first starts transmission.Remaining website is kept out of the way counting and is hung up, and waits for that channel becomes the free time again.After channel again becomes the free time and waits for DIFS, select to keep out of the way counting time little website and access channel.Go down with this, keep out of the way the longest website of counting and finally access channel and transmit.For the website of newly access, the random back counting that it selects from whole CW is probably all large by keeping out of the way the remaining count value of keeping out of the way of website counting hang-up in access contention before than those.

In embodiments of the present invention, AP also monitors channel status while competitive channel, to know whether its cooperation AP competes channel.

When this AP competes transmission channel, perform step 202 and 203.

202, on the transmission channel competed, PPDU frame head is sent to site-local;

After AP competes channel, AP sends PPDU frame head to site-local on the transmission channel competed.

203, after the duration of wait interval, PSDU is sent to above-mentioned site-local;

AP, after step 202 sends PPDU frame head, waits for interval duration, after the duration of wait above-mentioned interval, sends PSDU to above-mentioned site-local.

Because the number difference be not both due to long training field (LTF, Long Training Field) of PPDU frame head length caused, therefore, in embodiments of the present invention, AP can estimate according to the number of LTF the duration that transmission PPDU frame head needs.In embodiments of the present invention, above-mentioned interval duration can be pre-configured in AP, also can be calculated in advance by AP, be not construed as limiting herein.

On the basis of the embodiment of the present invention, by the control to interval duration, can also make the cooperation AP of this AP in the duration of above-mentioned interval, complete the transmission of the PPDU frame head to respective website, and make the cooperation AP of this AP while above-mentioned AP sends PSDU, the transmission channel that this AP competes sends PSDU to respective website.

In one implementation, when AP only has a cooperation AP, AP can by the schedule information respective alternately with its cooperation AP, wherein, respective schedule information can comprise the number needing the LTF carried in PPDU frame head to be sent separately, then according to the schedule information of its cooperation AP, AP can estimate that this cooperation AP sends the duration of PPDU frame head needs, adds after a SIFS duration that this cooperation AP estimated transmission PPDU frame head needs as above-mentioned interval duration.

In another kind of implementation, when AP has N number of cooperation AP (N>1), the schedule information that AP is prior and its cooperation AP is respective alternately, wherein, respective schedule information comprises: the number and the respective PPDU cooperation order of transmission that need the long training field of carrying in PPDU frame head to be sent separately.Then AP is according to the number of the long training field needing in each cooperation AP PPDU frame head to be sent to carry, and estimates that each cooperation AP sends the duration required for PPDU frame head; Afterwards according to the PPDU cooperation order of transmission of this AP and N number of cooperation AP, and formula:

${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of this AP _i, wherein, the i in formula is the PPDU cooperation order of transmission of this AP, s(k) and represent that PPDU cooperation order of transmission is the cooperation AP of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head.

It should be noted that, in embodiments of the present invention, the process of the schedule information that above-mentioned AP and its cooperation AP is respective alternately can to occur in time each AP sets up cooperation relation or afterwards, to be not construed as limiting herein.The PPDU of each AP that above-mentioned cooperation AP concentrates cooperate each AP that order of transmission can be concentrated by cooperation AP through consultation mode determine, certainly, the PPDU cooperation order of transmission of each AP that cooperation AP concentrates also can be determined according to certain agreement acquiescence, such as can determine according to the PPDU cooperation order of transmission of the size of latter several to each AP of the MAC Address of each AP in advance, be not construed as limiting herein.

It should be noted that, " respective website " mentioned in the embodiment of the present invention refers to access node site-local separately, and each access node only sends PPDU frame head and PSDU to the site-local of oneself.

Therefore, interval duration is introduced in the embodiment of the present invention, achieve the discontinuous transmission of PPDU and PSDU, in addition, by the control to interval duration, can make before each AP transmits PSDU at the same time, to transmit separately respective PPDU frame head at different time points, mutually conflict with the PPDU frame head that this is avoided each cooperation AP to transmit, improve the reliability of transfer of data.

Above-described embodiment is competed transmission channel for AP and is described, and in another kind of scene, some cooperation AP of possible AP first compete transmission channel, are described below for this scene, and in embodiments of the present invention, AP only has a cooperation AP.As shown in Figure 3, the transmission method of the physical layer data bag in the embodiment of the present invention, comprising:

301, monitor channel state compete transmission channel;

Particularly, step 301 with reference to the description in step 201, can repeat no more herein.

302, when AP compete to listen to before transmission channel other AP send PPDU frame head time, detect the cooperation AP whether other AP above-mentioned is this AP;

In one implementation, AP can intercept and capture and resolve the packet of other AP above-mentioned transmission, by resolving the BSSID (BSSID in the mac frame header of this packet, Basic Service Set Identifier) identify that other AP above-mentioned is which AP in network, assert that whether it is the cooperation AP of this AP with this.

Above-mentioned implementation requires that packet is resolved to MAC layer by AP, processing delay and expense larger, in order to reduce processing delay and expense, in PPDU, cooperation identification field (i.e. Coordinaion id field) is introduced in the embodiment of the present invention, cooperation identification field is used for the cooperation identification information of a bearing identification AP, then AP only needs the PPDU frame head intercepting and capturing other AP above-mentioned transmission, by resolving the cooperation identification information carried in the cooperation identification field of this PPDU frame head, can identify other AP above-mentioned is which AP in network, assert that whether it is the cooperation AP of this AP with this.Particularly, the part field in PPDU frame head signaling territory can be used as cooperation identification field, certainly, also using other reserved field in PPDU frame head as cooperation identification field, can be not construed as limiting herein.

When detecting that other AP above-mentioned is the cooperation AP of this AP, perform step 303, otherwise, return step 301.

303, after other AP above-mentioned sends PPDU frame head, wait for a SIFS, the transmission channel using other AP above-mentioned to compete afterwards sends PPDU frame head and PSDU to site-local;

When in step 302, AP detects that other AP above-mentioned is for after its cooperation AP, AP no longer competes transmission channel but keeps monitoring, as its cooperation AP(and other AP above-mentioned) send PPDU frame head after, this AP waits for a SIFS; After wait SIFS, the transmission channel that AP uses its cooperation AP to compete sends PPDU frame head and PSDU to site-local.

It should be noted that, in embodiments of the present invention, other AP above-mentioned can description in reference diagram 2 to scheme performed after transmission channel in competition.

First compete the scene of transmission channel below with some cooperation AP of AP, and AP has N number of cooperation AP(N>1) for example is described, as shown in Figure 4, the transmission method of the physical layer data bag in the embodiment of the present invention, comprising:

401, monitor channel state compete transmission channel;

Particularly, step 401 with reference to the description in step 201, can repeat no more herein.

402, when AP compete to listen to before transmission channel other AP send PPDU frame head time, detect the cooperation AP whether other AP above-mentioned is this AP;

In one implementation, AP can intercept and capture and resolve the packet of other AP above-mentioned transmission, by resolving the BSSID (BSSID in the mac frame header of this packet, Basic Service Set Identifier) identify that other AP above-mentioned is which AP in network, assert that whether it is the cooperation AP of this AP with this.

Above-mentioned implementation requires that packet is resolved to MAC layer by AP, processing delay and expense larger, in order to reduce processing delay and expense, in PPDU, cooperation identification field (i.e. Coordinaion id field) is introduced in the embodiment of the present invention, cooperation identification field is used for the cooperation identification information of a bearing identification AP, then AP only needs the PPDU frame head intercepting and capturing other AP above-mentioned transmission, by resolving the cooperation identification information carried in the cooperation identification field of this PPDU frame head, can identify other AP above-mentioned is which AP in network, assert that whether it is the cooperation AP of this AP with this.Particularly, the step field in PPDU frame head signaling territory can be used as cooperation identification field, certainly, also using other reserved field in PPDU frame head as cooperation identification field, can be not construed as limiting herein.

When detecting that other AP above-mentioned is the cooperation AP of this AP, perform step 403, otherwise, return step 401.

403, wait for a SIFS after the cooperation AP being i-1 at PPDU cooperation order of transmission sends PPDU frame head, the transmission channel using other AP above-mentioned to compete afterwards sends PPDU frame head to site-local;

When in step 402, AP detects that other AP above-mentioned is for after its cooperation AP, AP no longer competes transmission channel but keeps monitoring, because AP has obtained the PPDU cooperation order of transmission of its all cooperation AP, therefore, when the PPDU order of transmission that cooperates is that after the cooperation AP of i-1 sends PPDU frame head, AP waits for a SIFS; After wait SIFS, the transmission channel that AP uses its cooperation AP to compete sends PPDU frame head to site-local.Wherein, i is the PPDU cooperation order of transmission of this AP.

404, while the cooperation AP being 1 at PPDU cooperation order of transmission sends PSDU, the transmission channel that other AP above-mentioned competes sends PSDU to site-local.

It should be noted that, in embodiments of the present invention, other AP above-mentioned can description in reference diagram 2 to scheme performed after transmission channel in competition.

For ease of understanding technical solution of the present invention better, below with an embody rule scene example, be described the transmission method of the physical layer data bag in the embodiment of the present invention, wherein, in embodiments of the present invention, the AP cooperated with each other does not send RTS/CTS each other.

Link structure schematic diagram as shown in Figure 5, in distributed system (DS, Distribution System), STA1 is associated on AP1, and STA2 is associated on AP2, and after AP1 and AP2 sets up cooperation relation, AP1 and AP2 becomes the AP cooperated with each other.As shown in Figure 6:

601, the schedule information that AP1 and AP2 is respective alternately, schedule information comprises the number needing the LTF carried in AP PPDU frame head to be sent separately.

602, AP1 is according to the number needing the LTF carried in the PPDU frame head to be sent comprised in the schedule information of AP2, estimates that AP2 sends the duration PS of PPDU frame head _aP2.

603, suppose that AP1 competes transmission channel, AP1 starts to send PPDU frame head to site-local STA1.

604, after AP1 sends PPDU frame head, SIFS+PS is waited for _aP2duration.

605, AP1 is after the duration waiting for SIFS+PSAP2, starts to send PSDU to STA1.

606, AP2 monitors the PPDU frame head that AP1 sends, and sending AP1 by the cooperation identification information carried in the PPDU frame head of AP1 is its cooperation AP, then AP2 is after the PPDU frame head of AP1 sends, and waits for SIFS.

607, AP2 is after wait SIFS, starts to send PPDU frame head to STA2.

608, AP2 is after sending PPDU frame head, then starts to send PSDU to STA2.

Like this, AP1 with AP2 just achieves and in identical frequency resource, sends respective PSDU to respective STA simultaneously.

In the embodiment of the present invention, the AP cooperated with each other can also subscribe channel resource by RTS/CTS, because the RTS/CTS in the embodiment of the present invention has had cooperation interference management (IM concurrently, Interference Management), therefore in the embodiment of the present invention, RTS/CTS is expressed as IM-RTS/IM-CTS., only have a cooperation AP to be described for AP below, as shown in Figure 7, the transmission method of the physical layer data bag in the embodiment of the present invention, comprising:

701, monitor channel state compete transmission channel;

Particularly, step 701 with reference to the description in step 201, can repeat no more herein.

When this AP competes transmission channel, perform step 702 ~ 204.

702, to the mutual IM-RTS/IM-CTS message of site-local;

AP sends IM-RTS message to site-local, when site-local receives IM-RTS message, sends IM-CTS message to this AP to respond this AP after a SIFS duration.AP is by IM-RTS/IM-CTS message mutual with site-local, the cooperation AP of this AP is made to know that this AP competes transmission channel and have subscribed to channel resource, when the cooperation AP of this AP listen to the website associated with this AP send IM-CTS message time, the mutual IM-RTS/IM-CTS message of website also to its oneself association after a SIFS duration.

703, when listening to the website associated with cooperation AP and receiving IM-CTS message, after waiting for a PIFS, the transmission channel competed sends PPDU frame head to site-local.

704, after the duration of wait interval, PSDU is sent to above-mentioned site-local;

AP is after step 703 sends PPDU frame head, wait for interval duration, after the duration of wait above-mentioned interval, PSDU is sent to site-local, wherein, the cooperation AP of this AP completes the transmission of the PPDU frame head to respective website in the duration of above-mentioned interval, and the cooperation AP of this AP is while this AP sends PSDU, and the transmission channel that this AP competes sends PSDU to respective website.

Because the number difference be not both due to long training field (LTF, Long Training Field) of PPDU frame head length caused, therefore, in embodiments of the present invention, AP can estimate according to the number of LTF the duration that transmission PPDU frame head needs.In embodiments of the present invention, above-mentioned interval duration can be pre-configured in AP, also can be calculated in advance by AP, be not construed as limiting herein.

In one implementation, AP can by the schedule information respective alternately with its cooperation AP, wherein, respective schedule information can comprise the number needing the LTF carried in PPDU frame head to be sent separately, then according to the schedule information of its cooperation AP, AP can estimate that this cooperation AP sends the duration of PPDU frame head needs, adds after a SIFS duration that this cooperation AP estimated transmission PPDU frame head needs as above-mentioned interval duration.

It should be noted that, in embodiments of the present invention, the process of the schedule information that above-mentioned AP and its cooperation AP is respective alternately can to occur in time each AP sets up cooperation relation or afterwards, to be not construed as limiting herein.

Interval duration is introduced in the embodiment of the present invention, achieve the discontinuous transmission of PPDU and PSDU, in addition, by the control to interval duration, can make before each AP transmits PSDU at the same time, transmit separately respective PPDU frame head at different time points, mutually conflict with the PPDU frame head that this is avoided each cooperation AP to transmit, improve the reliability of transfer of data.

Embodiment illustrated in fig. 7ly compete transmission channel for AP and be described, in another kind of scene, some cooperation AP of possible AP first compete transmission channel, are described below for this this scene, in embodiments of the present invention, AP only has a cooperation AP.As shown in Figure 8, the transmission method of the physical layer data bag in the embodiment of the present invention, comprising:

801, monitor channel state compete transmission channel;

Particularly, step 801 with reference to the description in step 201, can repeat no more herein.

When AP had listened to cooperation AP transmission IM-RTS message before competing transmission channel, perform step 802 and 803.

802, listening to after the website associated with above-mentioned cooperation AP sends IM-CTS message, a SIFS is waited for, afterwards with site-local IM-RTS/IM-CTS message.

803, wait for a SIFS listening to after above-mentioned cooperation AP sends PPDU frame head, the transmission channel using above-mentioned cooperation AP to compete afterwards sends PPDU frame head and PSDU to site-local.

It should be noted that, in embodiments of the present invention, other AP above-mentioned can description in reference diagram 7 to scheme performed after transmission channel in competition.

Channel resource is subscribed by RTS/CTS below with the AP cooperated with each other, and AP has N number of cooperation AP(N>1) be example, the transmission method of the physical layer data bag in the embodiment of the present invention is described, similarly, because the RTS/CTS in the embodiment of the present invention has had IM concurrently, therefore in the embodiment of the present invention, RTS/CTS is expressed as IM-RTS/IM-CTS.As shown in Figure 9, the transmission method of the physical layer data bag in the embodiment of the present invention, comprising:

901, the schedule information that AP and its cooperation AP is respective alternately;

Wherein, respective schedule information comprises: the number and the respective PPDU cooperation order of transmission that need the long training field of carrying in PPDU frame head to be sent separately.

It should be noted that, in embodiments of the present invention, the process of the schedule information that above-mentioned AP and its cooperation AP is respective alternately can to occur in time each AP sets up cooperation relation or afterwards, to be not construed as limiting herein.The PPDU of each AP cooperated with each other cooperate order of transmission can by between each AP through consultation mode determine, certainly, the PPDU cooperation order of transmission of each AP cooperated with each other also can be determined according to certain agreement acquiescence, such as can determine according to the PPDU cooperation order of transmission of the size of latter several to each AP of the MAC Address of each AP in advance, be not construed as limiting herein.

902, transmission waiting time BPB is calculated _iand interval duration BPA _i;

AP, according to the number of the long training field needing in each cooperation AP obtained in step 901 PPDU frame head to be sent to carry, estimates that each cooperation AP sends the duration required for PPDU frame head;

The AP obtained according to step 901 afterwards cooperates with the PPDU of its N number of cooperation AP order of transmission and formula ${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of this AP _i; The AP obtained according to step 901 cooperates with the PPDU of its N number of cooperation AP order of transmission and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of this AP _i.Wherein, the i in formula is the PPDU cooperation order of transmission of this AP, s(k) represent that PPDU cooperation order of transmission is the cooperation AP of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch.

903, monitor channel state compete transmission channel;

Particularly, step 901 with reference to the description in step 201, can repeat no more herein.

When this AP competes transmission channel, perform step 904 ~ 906.

904, to the mutual IM-RTS/IM-CTS message of site-local;

AP sends IM-RTS message to site-local, when site-local receives IM-RTS message, sends IM-CTS message to this AP to respond this AP after a SIFS duration.AP is by IM-RTS/IM-CTS message mutual with site-local, each cooperation AP of this AP is made to know that this AP competes transmission channel and have subscribed to channel resource, when each cooperation AP of this AP listen to this AP receive IM-CTS message time, according to respective PPDU cooperate order of transmission successively also to oneself association the mutual IM-RTS/IM-CTS message of website.

905, when listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send IM-CTS time, wait for BPB _i, on the transmission channel competed, send PPDU frame head to site-local afterwards.

906, at wait interval duration BPA _iafterwards, PSDU is sent to above-mentioned site-local.

Embodiment illustrated in fig. 9ly compete transmission channel for AP and be described, in another kind of scene, some cooperation AP of possible AP first compete transmission channel, be described for this this scene below, in embodiments of the present invention, AP has N number of cooperation AP(N>1).As shown in Figure 10, the transmission method of the physical layer data bag in the embodiment of the present invention, comprising:

1001, the schedule information that AP and its cooperation AP is respective alternately;

Wherein, AP schedule information separately comprises: the number and the respective PPDU cooperation order of transmission that need the long training field of carrying in the PPDU frame head that AP is to be sent separately.

It should be noted that, in embodiments of the present invention, the process of the schedule information that above-mentioned AP and its cooperation AP is respective alternately can to occur in time each AP sets up cooperation relation or afterwards, to be not construed as limiting herein.The PPDU of each AP cooperated with each other cooperate order of transmission can by between each AP through consultation mode determine, certainly, the PPDU cooperation order of transmission of each AP cooperated with each other also can be determined according to certain agreement acquiescence, such as can determine according to the PPDU cooperation order of transmission of the size of latter several to each AP of the MAC Address of each AP in advance, be not construed as limiting herein.

1002, transmission waiting time BPB is calculated _iand interval duration BPA _i;

AP, according to the number of the long training field needing in each cooperation AP obtained in step 1001 PPDU frame head to be sent to carry, estimates that each cooperation AP sends the duration required for PPDU frame head;

The AP obtained according to step 1001 afterwards cooperates with the PPDU of its N number of cooperation AP order of transmission and formula ${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of this AP _i; The AP obtained according to step 1001 cooperates with the PPDU of its N number of cooperation AP order of transmission and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of this AP _i.Wherein, the i in formula is the PPDU cooperation order of transmission of this AP, s(k) represent that PPDU cooperation order of transmission is the cooperation AP of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

1003, monitor channel state compete transmission channel;

Particularly, step 1003 with reference to the description in step 201, can repeat no more herein.

When AP had listened to cooperation AP transmission IM-RTS message before competing transmission channel, enter step 1004.

1004, when listen to the order of transmission that to cooperate with PPDU be website that the cooperation AP of i-1 associates send IM-CTS message time, IM-RTS/IM-CTS message mutual with site-local.

If during 1≤i<N+1, perform step 1005 and 1006; If when i equals N+1, perform step 1007 and 1008.

1005, listen to the order of transmission that to cooperate with PPDU be website that the cooperation AP of N+1 associates send IM-CTS time, wait for BPB _i, the transmission channel competed at cooperation AP afterwards sends PPDU frame head to site-local.

1006, BPA is waited for _iafter, the transmission channel that cooperation AP competes sends PSDU to above-mentioned site-local.

1007, after the IM-CTS message receiving site-local, BPB is waited for _i, the transmission channel competed at cooperation AP afterwards sends PPDU frame head to above-mentioned site-local.

1008, BPA is waited for _iafter, the transmission channel that cooperation AP competes sends PSDU to above-mentioned site-local.

It should be noted that, in embodiments of the present invention, other AP above-mentioned can description in reference diagram 9 to scheme performed after transmission channel in competition.

For ease of understanding technical solution of the present invention better, below with an embody rule scene example, be described the transmission method of the physical layer data bag in the embodiment of the present invention, wherein, in embodiments of the present invention, the AP cooperated with each other sends RTS/CTS each other.

For the link structure schematic diagram shown in Fig. 5, in DS system, STA1 is associated on AP1, and STA2 is associated on AP2, and after AP1 and AP2 sets up cooperation relation, AP1 and AP2 becomes the AP cooperated with each other.As shown in figure 11:

1101, the schedule information that AP1 and AP2 is respective alternately, schedule information comprises in AP PPDU frame head to be sent separately needs the number of the LTF carried and respective PPDU cooperation order of transmission.

1102, AP1 is according to the number needing the LTF carried in the PPDU frame head to be sent comprised in the schedule information of AP2, estimates that AP2 sends the duration of PPDU frame head.

1103, AP1 calculates and sends waiting time BPB _iand interval duration BPA _i;

According to the PPDU cooperation order of transmission of AP1 and AP2, and formula:

${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(1-i)*\mathrm{SIFS}& 1\&le;i<2\\ 0& i=2\end{array}\right.,$ Calculate the interval duration BPA of AP1 _i;

PPDU cooperation order of transmission and formula according to AP1 and AP2:

${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;2\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of AP1 _i.Wherein, the i in formula is the PPDU cooperation order of transmission of AP1, s(k) represent that PPDU cooperation order of transmission is the cooperation AP of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch.

1104, AP2 is according to the number needing the LTF carried in the PPDU frame head to be sent comprised in the schedule information of AP1, estimates that AP1 sends the duration of PPDU frame head.

1105, AP2 calculates and sends waiting time BPB _jand interval duration BPA _j;

According to the PPDU cooperation order of transmission of AP1 and AP2, and formula:

${\mathrm{BPA}}_j=\left\{\begin{array}{cc}\underset{s\left(j\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(1-i)*\mathrm{SIFS}& 1\&le;j<2\\ 0& j=2\end{array}\right.,$ Calculate the interval duration BPA of AP2 _j;

PPDU cooperation order of transmission and formula according to AP1 and AP2:

${\mathrm{BPB}}_j=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(j\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(j-1)*\mathrm{SIFS}& 1<j\&le;2\\ \mathrm{PIFS}& j=1\end{array}\right.,$ Calculate the transmission waiting time BPB of AP2 _j.Wherein, the j in formula is the PPDU cooperation order of transmission of AP2, s(k) represent that PPDU cooperation order of transmission is the cooperation AP of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch.

1106, suppose that AP1 competes transmission channel, AP1 starts to the mutual IM-RTS/IM-CTS of site-local STA1.

1107, after AP2 listens to STA1 transmission IM-CTS, start and the mutual IM-RTS/IM-CTS of its site-local STA2.

1108, AP1 is after listening to STA2 transmission IM-CTS, waits for BPB _i.

1109, AP1 waits for BPB _iafterwards, PPDU frame head is sent to STA1.

1110, AP1 is after sending PPDU frame head, waits for BPA _i,.

1111, AP1 waits for BPA _i,afterwards, PSDU is sent to STA1.

1112, AP2 is after receiving the IM-CTS of STA2, waits for BPB _j.

1113, AP2 waits for BPB _jafterwards, PPDU frame head is sent to STA2;

1114, AP2 is after sending PPDU frame head, waits for BPA _j.

1115, AP2 waits for BPA _jafterwards, PSDU is sent to STA2.

Like this, AP1 with AP2 just achieves and in identical frequency resource, sends respective PSDU to respective STA simultaneously.

The embodiment of the present invention additionally provides a kind of access node, is described below to the access node in the embodiment of the present invention, and as shown in figure 12, the access node 1200 in the embodiment of the present invention, comprising:

Monitoring unit 1201, for monitor channel state;

Competitive unit 1202, for competing transmission channel;

Transmit-Receive Unit 1203, sends PPDU frame head to site-local on the transmission channel competed in competitive unit 1202; Sending above-mentioned PPDU frame head and after the duration of wait interval, sending PSDU to above-mentioned site-local.

In embodiments of the present invention, by the control to interval duration, can also make the cooperation access node of access node 1200 in the duration of above-mentioned interval, complete the transmission of the PPDU frame head to respective website, and make the cooperation access node of access node 1200 while access node 1200 sends PSDU, the transmission channel that access node 1200 is competed sends PSDU to respective website.

Further, on basis embodiment illustrated in fig. 12, as shown in figure 13, access node 1300 also comprises:

Interactive unit 1204 and acquiring unit 1205.

In a kind of application scenarios, when access node 1300 only has 1 cooperation access node:

Interactive unit 1204 for the mutual schedule information of above-mentioned cooperation access node; The schedule information of above-mentioned cooperation access node of acquiring unit 1205 for obtaining according to interactive unit 1204, estimates that above-mentioned cooperation access node sends the duration required for PPDU frame head; The duration that above-mentioned cooperation access node sends required for PPDU frame head is added 1 short frame pitch SIFS, obtains above-mentioned interval duration.Transmit-Receive Unit 1203 also for RTS/CTS message mutual with site-local so that after the cooperation access node of access website 1300 listens to above-mentioned RTS/CTS message, RTS/CTS message mutual with respective website; Monitoring unit 1201 listen to the website associated with above-mentioned cooperation access node send CTS message time, wait for a PIFS duration, the transmission channel competed in competitive unit 1202 afterwards send PPDU frame head to site-local.

Further, on basis embodiment illustrated in fig. 13, as shown in figure 14, access node 1400 also comprises: detecting unit 1206, for listened to before competitive unit 1202 competes transmission channel when monitoring unit 1201 other access node send PPDU frame head time, detect the cooperation access node whether other access node above-mentioned is access node 1300; In one implementation, detecting unit 1206 can be intercepted and captured and resolve the packet of other access node above-mentioned transmission, identify that other access node above-mentioned is which AP in network by the BSSID resolved in the mac frame header of this packet, assert that whether it is the cooperation access node of access node 1300 with this.In another kind of implementation, cooperation identification field (i.e. Coordinaion id field) is introduced in PPDU, cooperation identification field is used for the cooperation identification information of a bearing identification access node, then detecting unit 1206 only needs the PPDU frame head intercepting and capturing other access node above-mentioned transmission, by resolving the cooperation identification information carried in the cooperation identification field of this PPDU frame head, can identify other access node above-mentioned is which access node in network, assert that whether it is the cooperation access node of access node 1300 with this.Particularly, the part field in PPDU frame head signaling territory can be used as cooperation identification field, certainly, also using other reserved field in PPDU frame head as cooperation identification field, can be not construed as limiting herein.Transmit-Receive Unit 1203 is also for when the testing result of above-mentioned detecting unit 1206 is for being, after other access node above-mentioned sends PPDU frame head and waits for a SIFS, the transmission channel using other access node above-mentioned to compete sends PPDU frame head and PSDU to site-local.

In the embodiment of the present invention, the access node of cooperating with each other can also subscribe channel resource by RTS/CTS, then on basis embodiment illustrated in fig. 13, when access node 1300 only has 1 cooperation access node, Transmit-Receive Unit 1203 also for: when monitoring unit 1201 listened to before competitive unit 1202 competes transmission channel the website associated with cooperation access node send CTS message time, wait for a SIFS, afterwards the mutual RTS/CTS message with site-local; Listen to after above-mentioned cooperation access node sends PPDU frame head at monitoring unit 1201, wait for a SIFS, the transmission channel using above-mentioned cooperation access node to compete afterwards sends PPDU frame head and PSDU to site-local.

In a kind of application scenarios, when there is N number of cooperation access node in access node 1300 (N is greater than 1):

Interactive unit 1204 for: with the mutual schedule information of above-mentioned N number of cooperation access node, wherein, the schedule information of each cooperation access node comprises: need the number of the long training field of carrying and the PPDU cooperation order of transmission of this cooperation access node in the PPDU frame head that this cooperation access node is to be sent;

Acquiring unit 1205, for the number needing the LTF carried in the PPDU frame head that each cooperation access node obtained according to interactive unit 1204 is to be sent, estimates that each cooperation access node sends the duration required for PPDU frame head;

The PPDU cooperation order of transmission of the access node 1300 obtained according to interactive unit 1204 and above-mentioned N number of cooperation access node, and formula:

${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of access node 1300 _i, wherein, the i in formula is the PPDU cooperation order of transmission of access node 1300, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head.

Further, access node 1300 also comprises: detecting unit (can refer to shown in Figure 14), for listened to before competitive unit 1202 competes transmission channel when monitoring unit 1201 other access node send PPDU frame head time, detect the cooperation access node whether other access node above-mentioned is access node 1300; In one implementation, detecting unit can be intercepted and captured and resolve the packet of other access node above-mentioned transmission, identify that other access node above-mentioned is which AP in network by the BSSID resolved in the mac frame header of this packet, assert that whether it is the cooperation access node of access node 1300 with this.In another kind of implementation, cooperation identification field (i.e. Coordinaion id field) is introduced in PPDU, cooperation identification field is used for the cooperation identification information of a bearing identification access node, then detecting unit only needs the PPDU frame head intercepting and capturing other access node above-mentioned transmission, by resolving the cooperation identification information carried in the cooperation identification field of this PPDU frame head, can identify other access node above-mentioned is which access node in network, assert that whether it is the cooperation access node of access node 1300 with this.Particularly, the segment section in PPDU frame head signaling territory can be used as cooperation identification field, certainly, also using other reserved field in PPDU frame head as cooperation identification field, can be not construed as limiting herein.Transmit-Receive Unit 1203 is also for when the testing result of above-mentioned detecting unit is for being, be that the cooperation access node of i-1 sends PPDU frame head and after waiting for a SIFS, the transmission channel using other access node above-mentioned to compete sends PPDU frame head to site-local at the PPDU order of transmission that cooperates; While at PPDU cooperation order of transmission being the cooperation access node transmission PSDU of 1, the transmission channel that other access node above-mentioned is competed sends PSDU to site-local.

In the embodiment of the present invention, the AP cooperated with each other can also subscribe channel resource by RTS/CTS, then on basis embodiment illustrated in fig. 13, when access node 1300 has N number of cooperation access node (N>1), acquiring unit 1205 also for:

The PPDU cooperation order of transmission of the access node 1300 obtained according to interactive unit 1204 and its N number of cooperation access node, and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of access node 1300 _i, wherein, the i in formula is the PPDU cooperation order of transmission of access node 1300, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

When access node 1300 competes transmission channel, Transmit-Receive Unit 1203 is also for RTS/CTS message mutual with site-local, so that after the cooperation access node of access website 1300 listens to the RTS/CTS message of access node 1300, RTS/CTS message mutual with respective website; Be that the website that the cooperation access node of N+1 associates sends CTS message when listening to the order of transmission that to cooperate with PPDU, and wait for above-mentioned BPB again _iafter, above-mentioned competition to transmission channel on send PPDU frame head to site-local.

When access node 1300 is competed less than transmission channel and above-mentioned i is more than or equal to 1 and is less than N+1, Transmit-Receive Unit 1203 also for: when monitoring unit 1201 listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send CTS message time, RTS/CTS message mutual with site-local; Monitoring unit 1201 listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send CTS message time, wait for above-mentioned BPB _i, the transmission channel competed at cooperation access node afterwards sends PPDU frame head to site-local; Wait for above-mentioned BPA more afterwards _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local;

When access node 1300 is competed less than transmission channel and above-mentioned i equals N+1, Transmit-Receive Unit 1203 also for: when monitoring unit 1201 listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send CTS message time, RTS/CTS message mutual with site-local; Receiving the CTS message of this site-local and waiting for above-mentioned BPB again _iafter, the transmission channel that cooperation access node is competed sends PPDU frame head to this site-local; Sending PPDU frame head and waiting for above-mentioned BPA _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local.

It should be noted that, access node 1200 in the embodiment of the present invention or access node 1300 or access node 1400 can as the AP in above-mentioned embodiment of the method, may be used for the whole technical schemes realized in said method embodiment, the function of its each functional module can according to the method specific implementation in said method embodiment, its specific implementation process can refer to the associated description in above-described embodiment, repeats no more herein.

Therefore, interval duration is introduced in the embodiment of the present invention, achieve the discontinuous transmission of PPDU and PSDU, in addition, by the control to interval duration, can make before each AP transmits PSDU at the same time, to transmit separately respective PPDU frame head at different time points, mutually conflict with the PPDU frame head that this is avoided each cooperation AP to transmit, improve the reliability of transfer of data.

The embodiment of the present invention also provides a kind of computer-readable storage medium, and wherein, this computer-readable storage medium has program stored therein, and this program performs and comprises in said method embodiment the part or all of layout recorded.

Be described the another kind of access node in the invention process below, refer to Figure 15, the access node 1500 in the embodiment of the present invention comprises:

The quantity of the processor 1504 of input unit 1501, output device 1502, memory 1503 and processor 1504(access node 1500 can be one or more, and Figure 15 is for a processor).In some embodiments of the invention, input unit 1501, output device 1502, memory 1503 and processor 1504 can be connected, as shown in figure 15 to be connected by bus by bus or alternate manner.

Wherein, processor 1504 for:

Monitor channel state also competes transmission channel;

When competing transmission channel: send PPDU frame head to site-local on the transmission channel competed; After the duration of wait interval, send PSDU to above-mentioned site-local.

In embodiments of the present invention, by the control to interval duration, can also make the cooperation access node of access node 1500 in the duration of above-mentioned interval, complete the transmission of the PPDU frame head to respective website, and make the cooperation access node of access node 1500 while access node 1500 sends PSDU, the transmission channel that access node 1500 is competed sends PSDU to respective website.

Further, when access node 1500 only has 1 cooperation access node, processor 1504 also for: with the mutual schedule information of above-mentioned cooperation access node; According to the schedule information of above-mentioned cooperation access node, estimate that above-mentioned cooperation access node sends the duration required for PPDU frame head; The duration that above-mentioned cooperation access node sends required for PPDU frame head is added 1 short frame pitch SIFS, obtains above-mentioned interval duration; RTS/CTS message mutual with site-local, so that after the cooperation access node of access website 1500 listens to above-mentioned RTS/CTS message, RTS/CTS message mutual with respective website; When listening to the website associated with above-mentioned cooperation access node and sending CTS message, wait for a PIFS duration, on the transmission channel competed, send PPDU frame head to site-local afterwards.Further, processor 1504 also for: when compete to have listened to before transmission channel other access node send PPDU frame head time, detect the cooperation access node whether other access node above-mentioned is access node 1500; When detecting that other access node above-mentioned is the cooperation access node of access node 1500, after other access node above-mentioned sends PPDU frame head and waits for a SIFS, the transmission channel using other access node above-mentioned to compete sends PPDU frame head and PSDU to site-local.

In embodiments of the present invention, the access node of cooperating with each other can also subscribe channel resource by RTS/CTS, then when access node 1500 only has 1 cooperation access node, processor 1504 also for: when compete to listen to before transmission channel the website associated with cooperation access node send CTS message time, wait for a SIFS, afterwards the mutual RTS/CTS message with site-local; Listening to after above-mentioned cooperation access node sends PPDU frame head, wait for a SIFS, the transmission channel using above-mentioned cooperation access node to compete afterwards sends PPDU frame head and PSDU to site-local.

When there is N number of cooperation access node in access node 1500 time (N is greater than 1), processor 1504 also for:

With the mutual schedule information of above-mentioned N number of cooperation access node, wherein, the schedule information of each cooperation access node comprises: need the number of the long training field of carrying and the PPDU cooperation order of transmission of this cooperation access node in the PPDU frame head that this cooperation access node is to be sent;

According to the number needing the LTF carried in the PPDU frame head that each cooperation access node is to be sent, estimate that each cooperation access node sends the duration required for PPDU frame head;

To cooperate order of transmission and formula according to the PPDU of access node 1500 and above-mentioned N number of cooperation access node:

${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of access node 1500 _i, wherein, the i in formula is the PPDU cooperation order of transmission of access node 1500, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head;

Further, processor 1504 also for: when compete to have listened to before transmission channel other access node send PPDU frame head time, detect the cooperation access node whether other access node above-mentioned is access node 1500; When detecting that other access node above-mentioned is the cooperation access node of access node 1500, be that the cooperation access node of i-1 sends PPDU frame head and after waiting for a SIFS, the transmission channel using other access node above-mentioned to compete sends PPDU frame head to site-local at the PPDU order of transmission that cooperates; While at PPDU cooperation order of transmission being the cooperation access node transmission PSDU of 1, the transmission channel that other access node above-mentioned is competed sends PSDU to site-local;

In embodiments of the present invention, the access node of cooperating with each other can also subscribe channel resource by RTS/CTS, then when there is N number of cooperation access node in access node 1500 time (N is greater than 1), processor 1504 also for:

According to the PPDU cooperation order of transmission of access node 1500 with its N number of cooperation access node, and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of access node 1500 _i, wherein, the i in formula is the PPDU cooperation order of transmission of access node 1500, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

When access node 1500 competes transmission channel, processing unit 1504 is also for RTS/CTS message mutual with site-local, so that after the cooperation access node of access website 1500 listens to the RTS/CTS message of access node 1500, RTS/CTS message mutual with respective website; Be that the website that the cooperation access node of N+1 associates sends CTS message when listening to the order of transmission that to cooperate with PPDU, and at the above-mentioned BPB of wait _iafter, above-mentioned competition to transmission channel on send PPDU frame head to site-local;

When access node 1500 is competed less than transmission channel and above-mentioned i is more than or equal to 1 and is less than N+1, processing unit 1504 also for: when listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send CTS message time, RTS/CTS message mutual with site-local; Listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send CTS message time, wait for above-mentioned BPB _i, the transmission channel competed at cooperation access node afterwards sends PPDU frame head to site-local; Wait for above-mentioned BPA more afterwards _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local;

When access node 1500 is competed less than transmission channel and above-mentioned i equals N+1, processing unit 1504 also for: when listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send CTS message time, RTS/CTS message mutual with site-local; Receiving the CTS message of this site-local and waiting for above-mentioned BPB again _iafter, the transmission channel that cooperation access node is competed sends PPDU frame head to described site-local; Sending PPDU frame head and waiting for above-mentioned BPA _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local.

It should be noted that, access node 1500 in the embodiment of the present invention can as the AP in above-mentioned embodiment of the method, may be used for the whole technical schemes realized in said method embodiment, the function of its each functional module can according to the method specific implementation in said method embodiment, its specific implementation process can refer to the associated description in above-described embodiment, repeats no more herein.

Therefore, interval duration is introduced in the embodiment of the present invention, achieve the discontinuous transmission of PPDU and PSDU, in addition, by the control to interval duration, can make before each AP transmits PSDU at the same time, to transmit separately respective PPDU frame head at different time points, mutually conflict with the PPDU frame head that this is avoided each cooperation AP to transmit, improve the reliability of transfer of data.

It should be noted that, for aforesaid each embodiment of the method, in order to easy description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other order or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be all that the present invention is necessary.

In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiment.

One of ordinary skill in the art will appreciate that all or part of step in the various methods in above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, and storage medium such as can comprise: read-only memory, random asccess memory, disk or CD etc.

Above a kind of physical layer data package transmission method provided by the present invention and access node are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, this description should not be construed as limitation of the present invention.

Claims (20)

1. a transmission method for physical layer data bag, is characterized in that,

Access node monitor channel state also competes transmission channel;

When described access node competes transmission channel: described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local;

Interval duration is waited for after sending described PPDU frame head; Send physical layer service data PSDU to described site-local afterwards.

2. method according to claim 1, is characterized in that,

Described access node only has a cooperation access node;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, also comprise before:

Schedule information mutual with cooperation access node;

According to the schedule information of described cooperation access node, estimate that described cooperation access node sends the duration required for PPDU frame head;

The duration that described cooperation access node sends required for PPDU frame head is added 1 short frame pitch SIFS, obtains described interval duration.

3. method according to claim 1 and 2, is characterized in that, described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, also comprise before:

Send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, comprising:

The website associated with described cooperation access node if listen to described cooperation access node send allow to send protocol message time, wait for some cooperation frame pitch PIFS, afterwards described access node described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

4. method according to claim 2, is characterized in that,

, also to comprise after competing transmission channel in described access node monitor channel state:

If described access node had listened to other access node and sent PPDU frame head before competition to transmission channel, then:

Detect the cooperation access node whether other access node described is described access node,

If other access node described is the cooperation access node of described access node, then after other access node described sends PPDU frame head, wait for a SIFS, the transmission channel that described access node uses other access node described to compete afterwards sends PPDU frame head and PSDU to site-local.

5. method according to claim 2, is characterized in that,

In described access node monitor channel state and after competing transmission channel, described method also comprises:

If described access node had listened to cooperation access node and sent request transmission protocol message before competition to transmission channel, then:

Listen to the website that associates with described cooperation access node to described cooperation access node send allow to send protocol message time, wait for a SIFS, send with site-local interaction request/allow afterwards and send protocol message;

Listening to after described cooperation access node sends PPDU frame head, wait for a SIFS, the transmission channel that described access node uses described cooperation access node to compete afterwards sends PPDU frame head and PSDU to site-local.

6. method according to claim 1, is characterized in that,

There is N number of cooperation access node in described access node, wherein, N is greater than 1;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local before, comprising:

With the mutual schedule information of described N number of cooperation access node, wherein, the schedule information of each cooperation access node comprises: need the number of the long training field of carrying and the PPDU cooperation order of transmission of this cooperation access node in the PPDU frame head that this cooperation access node is to be sent;

According to the number of the long training field needing in the PPDU frame head that each cooperation access node is to be sent to carry, estimate that each cooperation access node sends the duration required for PPDU frame head;

To cooperate order of transmission and formula according to the PPDU of described access node and described N number of cooperation access node ${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head.

7. method according to claim 6, is characterized in that,

Described access node monitor channel state also after competing transmission channel, also comprises:

If described access node had listened to other access node and sent PPDU frame head before competition to transmission channel, then:

Detect the cooperation access node whether other access node described is described access node,

If other access node described is the cooperation access node of described access node, then:

Be, after the cooperation access node of i-1 sends PPDU frame head, waits for a SIFS at the PPDU order of transmission that cooperates, afterwards described access node use other access node described to compete transmission channel to site-local transmission PPDU frame head;

While at PPDU cooperation order of transmission being the cooperation access node transmission PSDU of 1, the transmission channel using other access node described to compete sends PSDU to site-local.

8. method according to claim 6, is characterized in that,

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, also comprise before:

To cooperate order of transmission and formula according to the PPDU of described access node and described N number of cooperation access node ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

Send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message;

Described described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local, comprising:

The order of transmission that to cooperate with PPDU if listen to is that website that the cooperation access node of N+1 associates sends when allowing to send protocol message, waits for described BPB _i, afterwards described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

9. method according to claim 6, is characterized in that,

After the mutual schedule information of described and described N number of cooperation access node, comprising:

To cooperate order of transmission and formula according to the PPDU of described access node and described N number of cooperation access node ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i;

Described in described access node monitor channel state and after competing transmission channel, if described access node had listened to cooperation access node before competition to transmission channel send request transmission protocol message, then described method has also comprised:

When listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send allow to send protocol message time, send with site-local interaction request/allow and send protocol message;

If described i is more than or equal to 1 and is less than N+1, then: listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send allow to send protocol message time, wait for described BPB _i; The transmission channel competed at cooperation access node afterwards sends PPDU frame head to described site-local; Wait for described BPA afterwards _i; At the described BPA of wait _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local;

If described i equals N+1, then: after sending/allow send protocol message with described site-local interaction request, wait for described BPB _i; At the described BPB of wait _iafter, the transmission channel that cooperation access node is competed sends PPDU frame head to described site-local; Wait for described BPA afterwards _i; At the described BPA of wait _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local.

10. the method according to claim 4 or 7, is characterized in that,

Whether other access node described in described detection is the cooperation access node of described access node, comprising:

The cooperation identification information carried in the PPDU frame head sent by other access node described identifies other access node described, differentiate that whether other access node described is the cooperation access node of described access node with this, wherein, described cooperation identification information is used for mark access node.

11. 1 kinds of access nodes, is characterized in that, comprising:

Monitoring unit, for monitor channel state;

Competitive unit, for competing transmission channel;

Transmit-Receive Unit, sends physical layer protocol data unit PPDU frame head to site-local on the transmission channel competed in described competitive unit; After sending described PPDU frame head, wait for interval duration, send PSDU to described site-local afterwards.

12. access nodes according to claim 11, is characterized in that,

Described access node only has 1 cooperation access node;

Described access node also comprises:

Interactive unit, for the mutual schedule information of described cooperation access node;

Acquiring unit, for the schedule information of described cooperation access node obtained according to described interactive unit, estimates that described cooperation access node sends the duration required for PPDU frame head; The duration that described cooperation access node sends required for PPDU frame head is added 1 short frame pitch SIFS, obtains described interval duration.

13. access nodes according to claim 11 or 12, is characterized in that,

Described Transmit-Receive Unit also for: send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message; Described monitoring unit listen to the website associated with described cooperation access node send allow to send protocol message time, wait for some cooperation frame pitch PIFS, afterwards described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

14. access nodes according to claim 12, is characterized in that,

Described access node also comprises:

Detecting unit: for listened to before described competitive unit competes transmission channel when described monitoring unit other access node send PPDU frame head time, detect the cooperation access node whether other access node described is described access node;

Described Transmit-Receive Unit also for: when the testing result of described detecting unit is for being, after other access node described sends PPDU frame head, wait for a SIFS, the transmission channel using other access node described to compete afterwards sends PPDU frame head and PSDU to site-local.

15. access nodes according to claim 12, is characterized in that,

Described Transmit-Receive Unit also for: when described monitoring unit listened to before described competitive unit competes transmission channel the website associated with described cooperation access node send allow to send protocol message time, wait for a SIFS, send with site-local interaction request/allow afterwards and send protocol message; Listen to after described cooperation access node sends PPDU frame head at described monitoring unit, wait for a SIFS, the transmission channel using described cooperation access node to compete afterwards sends PPDU frame head and PSDU to site-local.

16. access nodes according to claim 11, is characterized in that,

There is N number of cooperation access node in described access node, wherein, N is greater than 1;

Described access node also comprises:

Interactive unit, for with the mutual schedule information of described N number of cooperation access node, wherein, the schedule information of each cooperation access node comprises: need the number of the long training field of carrying and the PPDU cooperation order of transmission of this cooperation access node in the PPDU frame head that this cooperation access node is to be sent;

Acquiring unit, for:

Need the number of the long training field of carrying in the PPDU frame head that each cooperation access node obtained according to described interactive unit is to be sent, estimate that each cooperation access node sends the duration required for PPDU frame head;

The PPDU cooperation order of transmission of the access node obtained according to described interactive unit and described N number of cooperation access node, and formula ${\mathrm{BPA}}_i=\left\{\begin{array}{cc}\underset{s\left(i\right)<s\left(k\right)\&le;N+1}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(N-i)*\mathrm{SIFS}& 1\&le;i<N+1\\ 0& i=N+1\end{array}\right.,$ Calculate the interval duration BPA of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head.

17. access nodes according to claim 16, is characterized in that,

Described access node also comprises:

Detecting unit: for listened to before described competitive unit competes transmission channel when described monitoring unit other access node send PPDU frame head time, detect the cooperation access node whether other access node described is described access node;

Described Transmit-Receive Unit also for: when the testing result of described detecting unit is for being, be that the cooperation access node of i-1 sends PPDU frame head and after waiting for a SIFS, the transmission channel using other access node described to compete sends PPDU frame head to site-local at the PPDU order of transmission that cooperates; While at PPDU cooperation order of transmission being the cooperation access node transmission PSDU of 1, the transmission channel that other access node described is competed sends PSDU to site-local.

18. access nodes according to claim 16, is characterized in that,

Described acquiring unit also for:

The PPDU cooperation order of transmission of the described access node obtained according to described interactive unit and described N number of cooperation access node, and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i, wherein, the i in formula is the PPDU cooperation order of transmission of described access node, s(k) and represent that PPDU cooperation order of transmission is the cooperation access node of k, PL _{s (k)}represent s(k) send duration required for PPDU frame head, PIFS represents a cooperation frame pitch;

Described Transmit-Receive Unit also for: send with site-local interaction request/allow and send protocol message, send/allow send after protocol message so that the cooperation access node of described access website listens to described request, send with respective website interaction request/allow and send protocol message; When listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send allow to send protocol message time and waiting for described BPB _iafter, described competition to transmission channel on send physical layer protocol data unit PPDU frame head to site-local.

19. access nodes according to claim 16, is characterized in that,

Described acquiring unit also for:

The PPDU cooperation order of transmission of the described access node obtained according to described interactive unit and described N number of cooperation access node, and formula ${\mathrm{BPB}}_i=\left\{\begin{array}{cc}\mathrm{PIFS}+\underset{0<s\left(k\right)<s\left(i\right)}{\mathrm{\&Sigma;}}{\mathrm{PL}}_{s\left(k\right)}+(i-1)*\mathrm{SIFS}& 1<i\&le;N+1\\ \mathrm{PIFS}& i=1\end{array}\right.,$ Calculate the transmission waiting time BPB of described access node _i;

If described i is more than or equal to 1 and is less than N+1, described Transmit-Receive Unit also for: when described monitoring unit listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send allow to send protocol message time, send with site-local interaction request/allow and send protocol message; Described monitoring unit listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of N+1 associates send allow to send protocol message time, wait for described BPB _i, the transmission channel competed at cooperation access node afterwards sends PPDU frame head to described site-local; Wait for described BPA more afterwards _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local;

If described i equals N+1, described Transmit-Receive Unit also for: when listen to the order of transmission that to cooperate with PPDU be website that the cooperation access node of i-1 associates send allow to send protocol message time, send with site-local interaction request/allow and send protocol message; Send protocol message in the permission receiving described site-local and wait for described BPB again _iafter, the transmission channel that cooperation access node is competed sends PPDU frame head to described site-local; Sending PPDU frame head and waiting for described BPA _iafter, the transmission channel that cooperation access node is competed sends PSDU to described site-local.

20. access nodes according to claim 14 or 17, is characterized in that,

Described detecting unit specifically for: the cooperation identification field of carrying in the PPDU frame head sent by described other access node identifies other access node described, differentiates that whether other access node described is the cooperation access node of described access node with this.