CN102006630B - Multichannel cooperative data transmission method and system - Google Patents
Multichannel cooperative data transmission method and system Download PDFInfo
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Abstract
The invention discloses a multichannel cooperative data transmission method and system. The method of the invention comprises the following steps: a sender sends a cooperative request-to-send (CRTS) packet carrying a data channel number to a receiver through a first control channel; after the receiver receives the CRTS packet, if the acquired data channel is judged to be usable, the receiver returns a conditional clear-to-send (CCTS) packet carrying the highest channel rate between the receiver and the sender to the sender; a candidate cooperative node intercepts the CRTS packet and the CCTS packet, and if the acquired data channel is judged to be usable and the cooperation condition is met, the candidate cooperative node sends a high (HI) packet according to access time delay; if the receiver only receives the HI packet, the receiver sends a relay acknowledgement (RACK) packet on the first control channel to disclose the cooperative node; if the sender receives the RACK packet, the sender sends a data packet to the receiver through the cooperative node; and after the receiver successfully receives the data packet, the receiver returns an acknowledgement packet through a second control channel. The invention can be used to realize efficient and reliable data transmission.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to multi-channel collaboration data transmission method and system.
Background technology
Wireless communication technology is with fastest developing speed, the most widely used communication technology in the communications field in the last few years.In radio communication, because channel fading and path loss, the signal quality that receives can be than the bigger decline that has in the wire message way.For this reason, various anti-interference, antimierophonic wireless communication technologys have been proposed at present.(Multiple-Input Multiple-Output MIMO) is exactly a kind of method of utilizing space diversity greatly to improve signal quality wherein to multiple-input and multiple-output.The collaboration communication technology has been used the thought of MIMO, forms virtual antenna array (VAA) to reach the effect of MIMO diversity by the antenna that is distributed on the different nodes.Compare with non-cooperative system, adopt collaboration communication can obtain obvious performance gain.In wireless network, medium access control (MAC) method or access transmission method have solved each mobile subscriber or how fair node is, insert the use channel quickly and safely, shares the problem of limited wireless bandwidth resources efficiently.The quality of MAC method directly has influence on the quality of performance index such as network throughput, time delay.The advantage of utilizing collaboration diversity to provide in physical layer adopts the MAC method of cooperation can more reasonably arrange user's shared channel, improves network performance.
Cooperative MAC method or transmission method can be divided into single channel transmission and multichannel transmission dual mode according to the number of using channel.At present, single channel cooperative MAC method adopts the mode of specifying or competing to select a cooperative node mostly from a plurality of candidate's cooperative nodes.A kind of single channel cooperative MAC method (CoopMAC method) commonly used adopts specific mode, specifying the node of a satisfied cooperation condition by originating party from the cooperation table of oneself safeguarding before sending packet is cooperative node, and to its transmission CRTS (Cooperative Request-to-Send) grouping, appointed cooperative node then sends HTS (helper-to-Send) packet acknowledgement if judgement oneself can provide cooperation, improve transmission performance.This can not increase the conflict that is produced by a plurality of cooperative nodes competitions in the cooperative node competitive way by the method for originating party according to historical record selection cooperation.But, historical information in the cooperation table may not embody the time variation of channel status, can not reflect the message transmission rate that cooperative node is current, when this transmission rate reduces, the performance improvement that cooperation brings can reduce greatly, does not even directly send the mode that direct transfers of packet as receiving-transmitting sides.
In the mode that the employing cooperative node is at war with, receiving-transmitting sides week neighbour's node is by intercepting the control packet switching of receiving-transmitting sides, judge by certain judgment rule whether oneself can provide cooperation for receiving-transmitting sides, if of course, then become cooperative node according to the competition of the competing method of agreement defined.CRBAR (Cooperative Relay-Based Auto Rate) MAC method is to shake hands by RTS/CTS (Clear-to-send) grouping, allow all candidates' cooperative node from the CTS that listens to, extract channel condition information, and draw transmission rate between it and the transmitting-receiving side thus, satisfying under the cooperation condition, each candidate's cooperative node employing p adheres to keeping out of the way strategy and begins competition.But, this competitive strategy can be brought unnecessary competition conflict, causes the waste of time and channel resource.
With respect to the single channel transmission means, multi channel use can reduce collision and competition.(Dynamic Channel Assignment, DCA) in the MAC method, radio channel resource is divided into 1 common signal channel and a plurality of Traffic Channel, and each node in the network stores the channel operating position of neighbors in dynamic channel allocation.The node that has packet to send is selected idle Traffic Channel at random according to the state information of Traffic Channel in the channel use table, and send RTS/CTS grouping certain Traffic Channel of reservation of shaking hands at control channel, preengage successful node and receive and dispatch packet to forwarding on the corresponding Traffic Channel.In order to obtain the accurate service channel information, each node will have two transceivers that are operated in semiduplex mode in the network, and one one is used for intercepting common signal channel specially, and one one is used for the interception data channel.But DCA MAC method does not solve the exposed terminal problem that the use of control grouping and ACK grouping brings, and causes signal conflict.
Multi-channel collaboration (Cooperative Code Division MultipleAccess-based Multi-channel based on code division multiple access, CCM) the MAC method has also defined DCTS (Decide-Channel-to-Send), CFM (Confirm) and ITI (Information-to-Inform) grouping except using RTS/CTS control grouping.When originating party sends RTS, the debit in from the Channel Status Table of safeguarding, selecting available candidate channel and channel number is contained among the CTS divide into groups, the ITI of neighbors around transmitting-receiving side transmission afterwards divides into groups to come announcement channel to select whether to have conflict, originating party sends DCTS and divides into groups to come selective channel, and the debit replys CFM and divides into groups to come acknowledgement channel.In fact, the cooperation here mainly is to assist the originating party selective channel, rather than the cooperating relay transmission of carrying out in receiving-transmitting sides selected data channel.
Md.Rajibul Islam has proposed a kind of cooperative MAC method truly, use two channels to carry out channel booking, transmission in the method, and select the neighbors nearest from transmitting-receiving side as cooperative node, via node uses directional antenna technique, and selection is arrived the different channel directive sending packet of debit with originating party, in the method, cooperative node has really been realized cooperating relay transmission, has improved the efficiency of transmission in the wireless network by this cooperation.But, the transmission of cooperative node can have influence on the normal transmission at other nodes outside debit/originating party communication range, within the cooperative node communication range, and may cause collision with other node signal transmitted, thereby make channel utilization lower, suppressed the efficiency of transmission in the wireless network.
To sum up, radio data transmission method of the prior art can not utilize channel fully, evade signal conflict effectively, thereby can't realize transfer of data efficiently.
Summary of the invention
For overcoming the defective of above-mentioned prior art, the invention provides a kind of multi-channel collaboration data transmission method and system.Multi-channel collaboration data transmission method provided by the invention comprises:
Transmit leg sends the request cooperation carry data channel number by first control channel to the recipient and sends (Cooperative Request-to-Send is hereinafter to be referred as CRTS) grouping; After described recipient receives described CRTS grouping, know with number corresponding data channel of described data channel and can use if judge, then return the permission that carries supported high channel speed between described transmit leg and described recipient transmission (Cooperative-Clear-to-Send, the C TS) grouping that cooperates by first control channel to described transmit leg;
Several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node; Wherein said several candidate's cooperative nodes are intercepted described first control channel, and competition becomes cooperative node and specifically comprises: several candidate's cooperative nodes are to the described CRTS grouping on described first control channel and the described CCTS receipts of dividing into groups to detect, know with number corresponding data channel of described data channel and can use if judge, and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send cooperation indication (Help Indication the is designated hereinafter simply as HI) grouping of carrying candidate's cooperative node sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time;
Described recipient is if only receive a HI grouping in the time interval of setting, then identify corresponding candidate's cooperative node as cooperative node with described candidate's cooperative node, and on described first control channel, send cooperation affirmation (Relay Acknowledgment to described transmit leg, be designated hereinafter simply as RACK) grouping, described RACK grouping carries the corresponding candidate's cooperative node sign of the candidate's cooperative node that sends this HI grouping;
Described transmit leg then sends packet via cooperative node to described recipient by described data channel if receive described RACK grouping; After described recipient successfully receives described packet, return affirmation (Acknowledgment is hereinafter to be referred as ACK) grouping by second control channel.
The present invention also provides a kind of multi-channel collaboration data transmission system, comprising:
Dispensing device, described dispensing device are used for sending the request cooperation that carries data channel number by first control channel and send the CRTS grouping;
Receiving system, described receiving system is used for after receiving described CRTS grouping, if judge and to know with number corresponding data channel of described data channel and can use, then return the permission that carries supported high channel speed between described dispensing device and the described receiving system transmission CCTS that cooperate by first control channel to described dispensing device and divide into groups;
Several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node; Wherein said several candidate's cooperative nodes are intercepted described first control channel, and competition becomes cooperative node and specifically comprises: several candidate's cooperative nodes are to the described CRTS grouping on described first control channel and the described CCTS receipts of dividing into groups to detect, know with number corresponding data channel of described data channel and can use if judge, and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send cooperation indication (Help Indication the is designated hereinafter simply as HI) grouping of carrying candidate's cooperative node sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time;
Described recipient is if only receive a HI grouping in the time interval of setting, then identify corresponding candidate's cooperative node as cooperative node with described candidate's cooperative node, and on described first control channel, send cooperation affirmation (Relay Acknowledgment to described transmit leg, be designated hereinafter simply as RACK) grouping, described RACK grouping carries the corresponding candidate's cooperative node sign of the candidate's cooperative node that sends this HI grouping;
Described transmit leg then sends packet via cooperative node to described recipient by described data channel if receive described RACK grouping; After described recipient successfully receives described packet, return affirmation (Acknowledgment is hereinafter to be referred as ACK) grouping by second control channel; Described recipient is not if successfully receive described packet, then return Negative Acknowledgement NACK grouping by described second control channel, described cooperative node then resends described packet after listening to described NACK grouping, until receiving described ACK grouping.
The present invention also provides a kind of multi-channel collaboration data transmission system, comprising:
Dispensing device, described dispensing device are used for sending the request cooperation that carries data channel number by first control channel and send the CRTS grouping;
Receiving system, described receiving system is used for after receiving described CRTS grouping, if judge and to know with number corresponding data channel of described data channel and can use, then return the permission that carries supported high channel speed between described dispensing device and the described receiving system transmission CCTS that cooperate by first control channel to described dispensing device and divide into groups;
Several candidate's cooperation devices, described several candidate's cooperation devices become cooperation device for described first control channel being intercepted, also competing; Described wherein several candidate's cooperation devices are intercepted described first control channel, and competition becomes cooperation device and specifically comprises: several candidate's cooperation devices are to the described CRTS grouping on described first control channel and the described CCTS receipts of dividing into groups to detect, know with number corresponding data channel of described data channel and can use if judge, and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send the cooperation indication HI grouping of carrying candidate's cooperation device sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time;
When described receiving system also is used for only receiving a HI grouping in the time interval of setting, identify corresponding candidate's cooperation device as cooperation device with described candidate's cooperation device, and in described first control channel transmission cooperation affirmation RACK grouping, the corresponding candidate's cooperation device of candidate's cooperation device that described RACK grouping carries this HI grouping of transmission identifies;
Described dispensing device also is used for sending packet via cooperation device to described receiving system by described data channel after receiving described RACK grouping;
Described receiving system also is used for after successfully receiving described packet, returns by second control channel and confirms the ACK grouping; If successfully do not receive described packet, then return Negative Acknowledgement NACK grouping by described second control channel;
Described several candidate's cooperation devices also are used for if after listening to described NACK grouping, then resend described packet, until receiving described ACK grouping.
Multi-channel collaboration data transmission method provided by the invention and system, because after transmit leg (dispensing device) is selected available data channel, also need to judge by recipient's (receiving system) whether this data channel is available, and calculate supported high channel speed between transmit leg (receiving system) and the recipient's (receiving system), thereby what obtain is real-time and effective information, the time variation of adaptive channel state effectively, can avoid effectively descending because node motion or channel fading etc. causes the historical information accuracy, and make the unavailable or selected cooperative node of selected data channel (cooperation device) can not participate in cooperation, thereby effectively guaranteed selection real-time and effective data channel and cooperative node (cooperation device), adapted to the characteristics that wireless network moves flexibly; And, also owing to adopted second control channel to come the transferring ACK grouping, make ACK transmitted in packets and packet transmission separate, can thoroughly avoid the exposed terminal problem that brought by the ACK transmitted in packets, improved channel utilization greatly, reduce propagation delay time and discarded ratio of packet, realized efficient, reliable transfer of data.
Description of drawings
Fig. 1 is the flow chart of multi-channel collaboration data transmission method of the present invention.
Fig. 2 is transmit leg operational flowchart in the multi-channel collaboration data transmission method of the present invention.
Fig. 3 is candidate's cooperative node operational flowchart in the multi-channel collaboration data transmission method of the present invention.
Fig. 4 is recipient's operational flowchart in the multi-channel collaboration data transmission method of the present invention.
Fig. 5 is that the signal of the multi-channel collaboration data transmission method of one embodiment of the invention transmits sequential chart.
Fig. 6 is the topological structure sequential chart of a wireless network.
Fig. 7 A is the sequential chart that ACK grouping and packet collide.
The sequential chart that Fig. 7 B adopts second control channel to avoid ACK grouping and packet to collide for the present invention.
Fig. 8 transmits sequential chart for the signal of the multi-channel collaboration data transmission method of the present invention two embodiment.
Fig. 9 is the signal conflict sequential chart of concealed terminal.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, technical scheme of the present invention is clearly and completely described.
Fig. 1 is the flow chart of multi-channel collaboration data transmission method of the present invention.Fig. 2 is transmit leg operational flowchart in the multi-channel collaboration data transmission method of the present invention.Fig. 3 is candidate's cooperative node operational flowchart in the multi-channel collaboration data transmission method of the present invention.Fig. 4 is recipient's operational flowchart in the multi-channel collaboration data transmission method of the present invention.Step below in conjunction with Fig. 1 and the multi-channel collaboration data transmission method of the present invention of Fig. 4 is elaborated.
As shown in Figure 1, this multi-channel collaboration data transmission method comprises the steps:
Step S100, transmit leg sends the CRTS grouping carry data channel number by first control channel to the recipient; After described recipient receives described CRTS grouping, if judge and to know with number corresponding data channel of described data channel and can use, then return the CCTS that carries supported high channel speed between described transmit leg and the described recipient by first control channel to described transmit leg and divide into groups;
Above-mentioned steps S100 is carried out by transmit leg and recipient.
A channel use table (Channel Usage Table who is used for recording the channel operating position is all stored and safeguarded to each node in the wireless network, hereinafter to be referred as CUT), the content that records among the CUT comprises the following information of N data channel: channel number, channel current state, channel release time, (Sender Identification is hereinafter to be referred as S to use the sign of the sending node of this channel
ID), (Destination Identification is hereinafter to be referred as D to use the sign of the receiving node of this channel
ID), reiving/transmitting state, information source and this channel whether for last time signal transmit employed channel etc.Wherein, channel number is unique corresponding with channel, and i bar data channel can be used TCH
iRepresent; The channel current state has free time (Idle is hereinafter to be referred as I) and busy (Busy is hereinafter to be referred as B) two states; As data channel TCH
iChannel status when being B, also be provided with data channel TCH in this channel use table
iFinish the time of current data transmission, i.e. channel T release time
ReleaseDescribed reiving/transmitting state comprises reception, sends and cooperates three kinds, is respectively applied to be illustrated in utilize current state to be the data channel TCH of B
iIn the transfer of data of carrying out, the node that sends relevant control grouping is recipient, transmit leg or cooperative node.
When node is in idle condition (namely not having packet to receive or transmission), first control channel is intercepted, when listening to the control grouping, upgrade each state parameter of respective channel among the CUT, the timer that channel uses is set, this timer receives that for being used for expression the node of corresponding control grouping can keep network allocation vector (Network Allocation Vector is hereinafter to be referred as the NAV) time of using respective channel for the transmitting-receiving side that sends this control grouping.During timer expiry, the current state of data channel reverts to I by B.For example, after node is received the CCTS grouping, for keeping, the transmitting-receiving side that sends this CCTS grouping use the time of first control channel to be NAV
CCTS, and with channel T release time of first control channel among the CUT
ReleaseValue be set to NAV
CCTS, after this time, this node could use first control channel.
As shown in Figure 2, transmit leg carries out following operation in step S100:
Step S1 intercepts first control channel: when transmit leg is in idle condition, continue to intercept first control channel;
Step S2 has judged whether that packet needs to send: when transmit leg has packet to send to the recipient, and transmit leg execution in step S3, otherwise execution in step S1;
Step S3, judge whether to choose available data channel: transmit leg is being intercepted the idle distributed frame of first control channel (DIFS) after the time at interval, can inquire about by the CUT to this locality storage or selects available data channel by multiple mode such as each data channel being intercepted; If there is not available data channel, then return step S1 and namely keep first control channel is intercepted, treat to listen to again first control channel during free time, repeat said process and select available data channel; If available data channel arranged, then select wherein an available data channel, execution in step S4;
Step S4 sends the CRTS grouping: if successfully selected available data channel, with the data channel of selected data channel correspondence number (TCH for example
1) be included in the CRTS grouping, subsequently if first control channel still sends this CRTS grouping to the recipient behind idle one section random time on first control channel, and wait receives the CCTS grouping; Otherwise, execution in step S1.
As shown in Figure 4, the recipient carries out following operation in step S100:
Step D1 intercepts first control channel: when the recipient is in idle condition, continue to intercept first control channel;
Step D2 judges whether to receive the CRTS grouping of issuing oneself: if receive CRTS grouping, then execution in step D3; If do not receive, then continue execution in step D1 and namely continue to intercept first control channel;
Step D3, whether the judgment data channel is available: after the recipient receives this CRTS grouping, obtain the data channel TCH that comprises in this CRTS grouping
1And in CUT of its local storage data query channel number TCH
1The current state of corresponding data channel simultaneously (is designated as R according to supported high channel speed between the snr computation transmit leg that receives and the recipient
Sd).If know that its current state is I, assert that then this data channel can use execution in step D4;
Step D4 sends the CCTS grouping: if judge and know that this data channel can use, and will high channel speed R
SdBe arranged in the CCTS grouping and feed back to transmit leg by first control channel.
In step S100, transmit leg also carries out following operation as shown in Figure 2:
Transmit leg is after execution in step S4 namely sends the CRTS grouping, and execution in step S5 judges whether to receive the CCTS grouping: if transmit leg receives the CCTS grouping from the recipient, then wait for receiving the RACK grouping that the recipient sends; If transmit leg does not receive the CCTS grouping in (a for example short frame time) at the fixed time, reselect data channel after then keeping out of the way and retransmit CRTS grouping, execution in step S3.
Step S200, several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node; Wherein said several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node and specifically comprise: several candidate's cooperative nodes are to the described CRTS grouping on described first control channel and the described CCTS receipts of dividing into groups to detect, if judge know with number corresponding data channel of described data channel can with and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send the HI grouping of carrying candidate's cooperative node sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time;
Above-mentioned steps S200 is carried out by candidate's cooperative node, and as shown in Figure 3, candidate's cooperative node is carried out following operation:
Step H1 intercepts first control channel;
Step H2 judges whether to listen to the CRTS grouping: candidate's cooperative node continues first control channel is intercepted if listen to the CRTS grouping, waits for CCTS grouping execution in step H3; If do not listen to, then be in idle condition, continue execution in step H1 and namely intercept first control channel;
Step H3 judges whether to listen to CCTS grouping: when candidate's cooperative node (Helper is hereinafter to be referred as H) is being intercepted after first control channel receives that CRTS grouping and CCTS divide into groups execution in step H4; Otherwise, continue execution in step H1 and namely first control channel is intercepted, do not carry out other operation;
Step H4, whether the judgment data channel is available: candidate's cooperative node H at first judges the data channel TCH that comprises in the CRTS grouping according to the channel use table of this locality storage
1Whether corresponding data channel is available, if this data channel can be used execution in step H5 then; Otherwise return execution in step H1;
Step H5 judges whether to satisfy the cooperation condition: this candidate's cooperative node H extracts transmit leg to supported maximum transmission rate R the recipient from CCTS
Sh, and calculate this candidate's cooperative node H respectively with the transmission rate of transmit leg (hereinafter to be referred as R
Sh) and with recipient's transmission rate (hereinafter to be referred as R
Hd), if satisfy
Then this candidate's cooperative node H is known and self is satisfied the cooperation condition.At data channel TCH
1Corresponding data channel can with and when self satisfying the cooperation condition, candidate's cooperative node H calculates corresponding access delay and execution in step H6.Access delay is that can to distinguish the time interval (be mini-slot T to node
DI) integral multiple, channel status is more good, then access delay is more short, thereby the candidate's cooperative node that is at war with and can selects channel status the best according to the length of access delay.If discontented football association makes condition, candidate's cooperative node returns execution in step H1 and intercepts first control channel, does not carry out other operation;
Step H6, judge whether to send the HI grouping: this candidate's cooperative node H intercepts first control channel, if listen to the HI grouping at first control channel, then this candidate's cooperative node H returns execution in step H1 and namely intercepts first control channel, does not carry out other operation; If first control channel is in idle condition before access delay arrives, then after access delay arrives, send the HI grouping at first control channel immediately, comprise candidate's cooperative node sign in this HI grouping, also comprise R
ShAnd R
Hd
Step S300, described recipient is if only receive a HI grouping in the time interval of setting, then identify corresponding candidate's cooperative node as cooperative node with described candidate's cooperative node, and in described first control channel transmission RACK grouping, described RACK grouping carries the corresponding candidate's cooperative node of candidate's cooperative node that sends this HI grouping and identifies;
Above-mentioned steps S300 is carried out by the recipient, and it carries out following operation as shown in Figure 4:
Transmit leg is after execution in step D4 namely sends the CCTS grouping, and execution in step D5 namely judges whether to receive the HI grouping; If receive the HI grouping, judge whether the HI grouping bumps (step D6): if the HI grouping does not bump, be that the recipient only receives a HI grouping in the time interval of setting, then the recipient identifies corresponding candidate's cooperative node as cooperative node with the candidate's cooperative node that comprises in this HI grouping, and carries out following step D7;
Step D7 sends the RACK grouping: the recipient is arranged on this candidate's cooperative node sign in the RACK grouping, sends this RACK grouping by first control channel.This RACK grouping is used for notifying all candidate's cooperative nodes to stop competition, and is used for notifying transmit leg to begin to send packet.Simultaneously, the recipient also can be according to the R that comprises in the HI grouping
ShAnd R
HdCalculate this packet transmission required time, the channel information that the information of recipient's cooperative node of broadcasts selected on first control channel, affirmation are selected for use and this packet transmission required time, so that each node is known these information when intercepting first control channel, thereby make information among the CUT that each node updates stores.
When candidate's cooperative node is intercepted first control channel, judge whether to listen to RACK and divide into groups and indicate oneself to win to be cooperative node (step H7), if listen to the RACK grouping, then stop to send HI and divide into groups; Be cooperative node if indicate oneself to win in the RACK grouping that listens to, then execution in step H8 receives packet.
Step S400, described transmit leg then sends packet via cooperative node to described recipient by described data channel if receive described RACK grouping; After described recipient successfully receives described packet, return the ACK grouping by second control channel.
Above-mentioned steps S400 specifically comprises following operation:
Behind the transmit leg execution in step S5, if the CCTS grouping has been received in judgement, then execution in step S6 judges whether to receive HI grouping and RACK grouping.If transmit leg receives HI grouping and RACK grouping at first control channel, then send packet (step S7) to cooperative node: transmit leg is after first control channel receives HI grouping and RACK grouping, obtain the candidate's cooperative node sign as cooperative node that comprises in this RACK grouping, at data channel TCH
1Go up to this cooperative node and send packet.After cooperative node receives this packet (step H8), at data channel TCH
1Go up and transmit this packet (step H9) to the recipient.
As shown in Figure 4, the recipient carries out following operation:
After recipient's execution in step D7 namely sent the RACK grouping, execution in step D8 judged whether correctly to receive packet: correctly receive this packet as if the recipient, then execution in step D9: reply the ACK grouping by second control channel.
Transmit leg wait for to receive ACK grouping (step S8) at second control channel behind execution in step S7, receive this ACK grouping after, then clear up packet (step S9), recover idle condition.Cooperative node is intercepted at second control channel simultaneously, judges whether to listen to this ACK grouping (step H10), if listen to, then clears up packet (step H11), recovers idle condition; Otherwise, resend packet.
In above-mentioned steps S400, the recipient replys ACK employed second control channel that divides into groups, be that the physical channel with single that carries out before implementing this multi-channel collaboration data transmission method is divided in the multichannel process of (comprising control channel and data channel), can by frequency division multiple access/time division multiple access etc. arbitrarily frequency range/time slot of marking off of channel distribution mode be different from another control channel of first control channel.
In this multi-channel collaboration data transmission method, because transmit leg begins to send packet after receiving RACK grouping, therefore in the method, but each node is in judgment data channel time spent whether, if this data channel among the CUT satisfies T
Release＜NAV
CRTSOr this data channel current state is I, and then this data channel is available.
Fig. 5 is that the signal of the multi-channel collaboration data transmission method of one embodiment of the invention transmits sequential chart.As shown in Figure 5, send CRTS grouping, CCTS grouping, HI grouping and RACK grouping on first control channel; Send by transmit leg S to the packet DATA of cooperative node H with by the packet DATA of cooperative node H to recipient D on the data channel; Send the ACK grouping on second control channel.
Multi-channel collaboration data transmission method according to above-described embodiment, because behind sender-selected available data channel, again the availability of this data channel is confirmed by the recipient, and calculate supported high channel speed between transmit leg and the recipient by the recipient, thereby can select more real-time and effective data channel for the transmission of packet, and can obtain more reliably transmission rate information accurately, so that the result who whether satisfies the cooperation condition that cooperative node is judged meets the state of real-time data channel.And, because in this multi-channel collaboration data transmission method, adopt second control channel to transmit the ACK grouping, can avoid the signal conflict problem of following exposed terminal.
Fig. 6 is the topological structure sequential chart of a wireless network.As shown in Figure 6, comprise the first transmit leg Se1, the second transmit leg Se2, the first recipient De1 corresponding with the first transmit leg Se1, second recipient De2 and first candidate cooperative node He1 and the second candidate cooperative node He2 corresponding with the second transmit leg Se2 in this wireless network.Apart one jump between the first transmit leg Se1 and the second transmit leg Se2, namely each other in the other side's communication range; Between the first transmit leg Se1 and the second recipient De2, the second transmit leg Se2 and the first recipient De1 all at a distance of double bounce, namely each other outside the other side's communication range, so the first recipient Se1 and second recipient Se2 exposed terminal each other.Second transfer of data between first transfer of data between the first transmit leg Se1 and the first recipient De1 and the second transmit leg Se2 and the second recipient De2 has all been selected same data channel, and the first transmit leg Se1 and the first recipient De1 shake hands successfully, insert data channel prior to the second transmit leg Se2 and the second recipient De2 and carry out transfer of data, and in first transfer of data, first candidate's cooperative node He1 is as cooperative node.
Fig. 7 A is the sequential chart that ACK grouping and packet collide.Shown in Fig. 7 A, when the first transmit leg Se1 sends packet to first candidate's cooperative node He1, because the first transmit leg Se1 is in the communication range of the second transmit leg Se2, the second transmit leg Se2 can listen to the transmission behavior of the packet of the first transmit leg Se1, so keep out of the way the corresponding time, do not send packet.When the packet of first transfer of data has been sent to the first both candidate nodes He1 by the first party side of sending Se1 and has been sent to the first recipient De1 by the first both candidate nodes He1, because the first both candidate nodes He1 and the second sending node Se2 are also at a distance of double bounce (namely not in the scope of communicating with one another), the second transmit leg Se2 intercepts less than this transfer of data, think the data channel free time, thereby beginning sends packet to the second recipient De2.When first transfer of data is finished, the first recipient De1 sends the ACK grouping by this data channel to the first transmit leg Se1, if this moment, second transfer of data remained unfulfilled, then since the first transmit leg Se1 in the communication range of second transmit leg, this ACK grouping will with second transfer of data in packet produce collision at the first transmit leg Se1 place, cause the first transmit leg Se1 can not correctly receive ACK and divide into groups.
The sequential chart that Fig. 7 B adopts second control channel to avoid ACK grouping and packet to collide for the present invention.As shown in Fig. 7 B, because the first recipient De1 sends the ACK grouping to the first transmit leg Se1 by second control channel, thereby avoided this ACK to divide into groups to collide with the packet of second transfer of data, solved the problem of exposed terminal.
By above analysis as can be seen, utilize the multi-channel collaboration data transmission method of above-described embodiment, the time variation of adaptive channel state effectively, select real-time and effective data channel and cooperative node, take full advantage of channel, the bust this problem that the signal collision that can avoid the ACK grouping to cause again causes has realized transfer of data efficiently.
Further, above-mentioned multi-channel collaboration data transmission method also can comprise:
When recipient's execution in step D6 judges namely whether the HI grouping bumps, described recipient is if receive a plurality of HI groupings in the time interval of setting, then send to described candidate's cooperative node by described first control channel and retransmit indication (Retry Indication is hereinafter to be referred as RI) grouping;
After described several candidate's cooperative nodes listen to described RI grouping, random back is selected to resend described HI grouping behind the mini-slot in K mini-slot, wherein K is natural number, only receives a HI grouping until satisfying described recipient in the time interval of setting.
Fig. 8 transmits sequential chart for the signal of the multi-channel collaboration data transmission method of the present invention two embodiment.As shown in Figure 8, when on first control channel simultaneously or when in the default time interval, transmitting the HI grouping that a plurality of candidate's cooperative nodes send simultaneously, a plurality of HI groupings send collision, it produces reason is that two or more candidate's cooperative nodes have selected identical or close access delay to send the HI grouping, in the case, the recipient will receive two or more HI groupings in the time interval of setting (mini-slot).At this moment, the recipient does not reply the RACK grouping at first control channel, but divide into groups at first control channel transmission RI (step D7 ').Include the time that a plurality of HI groupings bump in this RI grouping, to help to indicate candidate's cooperative node of participating in competition next time, so that relevant candidate's cooperative node can insert fast again.Relevant candidate's cooperative node is after listening to this RI grouping, meeting repeating transmission HI grouping (step H7 '), be specially after listening to for the first control control channel free time and selecting a mini-slot at random in K mini-slot, wherein K is natural number, and preferred span is 4～8.Make the recipient in the time interval of setting, only receive a HI grouping if the competition of this candidate's cooperative node is retransmitted, then send the RACK grouping at first control channel, carry out follow-up flow process by above-mentioned multi-channel collaboration data transmission method.If still have the HI packet collisions, then repeat this process and in the time interval of setting, only receive a HI grouping until satisfying the recipient.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, can effectively solve a plurality of candidate's cooperative nodes because channel status is similar, and situation about when competition, clashing, thereby make in this case, still can successfully select effective candidate's cooperative node as the cooperative node of this data transfer, help to realize the collaboration data transmission, improve the data transmission efficiency of this multi-channel collaboration data transmission method.
Further, in above-mentioned multi-channel collaboration data transmission method, also can comprise:
Step D9 is described in the recipient carries out as Fig. 4 when judging whether correctly to receive packet, described recipient is not if successfully receive described packet, then reply Negative Acknowledgement (Negative Acknowledgment is hereinafter to be referred as NACK) grouping (step D9 ') by described second control channel;
Described cooperative node then resends described packet (namely returning execution in step H9) listen to described NACK grouping when execution in step H10 after, until receiving described ACK grouping.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, when making that owing to some cause specifics the recipient does not successfully receive packet, cooperative node can send this packet to the recipient again, has improved the reliability of this multi-channel collaboration data transmission method.
Further, in above-mentioned multi-channel collaboration data transmission method, describedly resend described packet, comprise when namely behind execution in step H10, returning execution in step H9: after reducing transmission rate, resend described packet.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, can improve the possibility that recipient when resending packet successfully receives this packet, avoided that this resends the time waste that this packet causes because repeatedly circulating, improved the efficient of this multi-channel collaboration data transmission method.
Further, in above-mentioned multi-channel collaboration data transmission method, also comprise:
Step S6 as shown in Figure 2 is described to judge whether to receive that HI grouping and RACK divide into groups, described transmit leg is after receiving described CCTS grouping, if receive HI grouping, then directly send described packet (step S7 ') to described recipient by described data channel;
Correspondingly, if judge that not receiving HI divides into groups, then direct execution in step D8 judges whether correctly to receive packet to the recipient when execution in step D5, described recipient then returns ACK grouping (step D9) by second control channel if successfully receive described packet;
Described recipient is not if successfully receive described packet, then returns NACK grouping (step D9 ') by described second control channel; Described transmit leg judges whether to receive ACK grouping (step S8 ') behind execution of step S7 ', if receive, then clear up packet (step S9), if do not receive, sends described packet to described recipient again by described data channel.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, after all candidate's cooperative nodes are listening to CRTS grouping and CCTS grouping, all judge know with CRTS in number corresponding data channel of the data channel that comprises unavailable or judge and know that himself discontented football association makes condition, when not having arbitrary cooperative node to send the HI grouping, transmit leg and recipient still can directly carry out transfer of data by the data channel of selecting for use, avoided causing data transmission fails because candidate's cooperative node can not provide cooperation, further improved the reliability of this multi-channel collaboration data transmission method.
Further, in above-mentioned multi-channel collaboration data transmission method, transmit leg is when execution in step S3, also comprise before to be described transmit leg by first control channel send the CRTS grouping that carries data channel number to the recipient: described sender-selected available data channels, wherein said available data channels are the data channel number corresponding data channel that carries in the described CRTS grouping;
Wherein, described sender-selected available data channels comprises:
Described transmit leg is checked the channel use table of local maintenance, comprises described channel number, current state and the used data channel of last transfer of data of candidate data channel in the described channel use table;
If the current state of the used data channel of last transfer of data is idle, selecting it is described available data channel;
If the current state of the used data channel of last transfer of data is then checked i data channel TCH for busy
iCurrent state, wherein i be the ID of transmit leg and recipient's ID sum divided by the remainder of data channel number in the described channel use table, if idle, then selecting it is described available data channel, if busy, then select arbitrary current state to be idle data channel at random.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, the preferred used data channel of last transfer of data that uses, the probability that can make the recipient confirm that this data channel can use is bigger, is easy to select just can determine the used data channel of this data transfer by a data channel; And the data channel used as if this last time transfer of data is unavailable, then by selecting the mode of a data channel to avoid selecting same data channel for use with other node with above-mentioned ad hoc fashion, thereby efficient and the channel utilization of this multi-channel collaboration data transmission method have been improved.
Further, in above-mentioned multi-channel collaboration data transmission method, also comprise:
Whether available at the judgment data channel described in the step D3 of above-mentioned Fig. 4, after if described recipient receives described CRTS grouping, if judge and to know unavailablely with number corresponding data channel of described data channel, then do not do any answer, namely return step D1 and intercept first control channel;
Described transmit leg does not receive the CCTS grouping that described recipient returns in the time of setting, then reselect available data channels and send the CRTS grouping, and namely transmit leg if the CCTS grouping is not received in judgement, then returns execution in step S3 when execution in step S5.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, can avoid when the recipient is unavailable, still transmitting packet and causing data to transmit failure when the selected data channel of transmit leg, directly reselect available data channels by the recipient, further improved the reliability of this multi-channel collaboration data transmission method.
Further, in above-mentioned multi-channel collaboration data transmission method, also comprise:
Described in the step D3 in above-mentioned Fig. 4, after if described recipient receives described CRTS grouping, if judge know unavailable with number corresponding data channel of described data channel, then described recipient reselects an available data channels, return the CCTS grouping that carries supported high channel speed between described transmit leg and the described recipient by described first control channel to described transmit leg, and the corresponding data channel of the available data channels of reselecting number;
After knowing during transmit leg execution in step S5 that described transmit leg receives described CCTS grouping, can use if judge the data channel of the described data channel correspondence in the described CCTS grouping, then confirm (CC) grouping by described first control channel to described recipient's transmitting channel;
Correspondingly, described several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node and specifically comprise:
Several candidate's cooperative nodes are after execution in step H2 namely judges whether to listen to the CRTS grouping, if listen to the CRTS grouping, continuation is intercepted described first control channel, described CCTS grouping and described CC grouping are intercepted in wait, after listening to described CCTS grouping and listening to described CC grouping, know with number corresponding data channel of described data channel and can use if judge, and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send the HI grouping of carrying candidate's cooperative node sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, be when the recipient judges that the data channel number corresponding data channel that comprises among the CRTS is unavailable, select an available data channels by the recipient, and this data channel number is included in the CCTS grouping confirmed by transmit leg, can either effectively avoid outer but be in other nodes in recipient's scope and use and carry out data with sender-selected same data channel and transmit the signal conflict (being hidden terminal problem) that causes because being in the transmit leg communication range like this, can reduce again and carry out data channel again and select the needed time, thereby improve reliability and the efficient of this multi-channel collaboration data transmission method.
Further, in the above-mentioned multi-channel collaboration data transmission method, the access delay that calculates in the process of carrying out step H6 as shown in Figure 3 of candidate's cooperative node wherein, described access delay is that described candidate's cooperative node obtains according to the channel quality of described data channel and the loading level of self.
The message transmission rate of supported maximum between two nodes is called other the 1st grade of this speed level, along with reducing of supported maximum data transfer rate, the rank of speed be designated as successively the 2nd grade, 3rd level ... the i level ....When the speed rank of candidate's cooperative node is the i level, make the cooperation time improve ratio
Then the cooperation time under its high one-level transmission rate situation improves than being
In like manner the cooperation time under its low one-level transmission rate situation improves than being
Wherein,
R is compared in expression respectively
Sh, R
HdHigher leveled transmission rate,
R is compared in expression respectively
Sh, R
HdThe transmission rate of low one-level; T
DIThe time interval distinguished of representing this node; Rand[x, y] be illustrated in integer of picked at random in [x, y] scope, α is constant.
Utilize the multi-channel collaboration data transmission method of above-described embodiment, owing to taken all factors into consideration the channel quality of data channel and the loading level of this candidate's cooperative node calculates access delay, make this access delay accurately to reflect and utilize this candidate's cooperative node in the validity of the enterprising line data transmission of this data channel, thereby make the recipient can when candidate's cooperative node utilizes access delay to be at war with, select best candidate's cooperative node as cooperative node, improved efficient and the success rate of transfer of data.
Further, in the above-mentioned multi-channel collaboration data transmission method, before sending packet to described recipient, one second transmit leg sends packet by described data channel to one second recipient, and transmit leg judge know its with described second transmit leg at a distance of double bounce, with described second recipient jumping apart, then describedly send packet to described recipient and comprise:
In the described step S7 of above-mentioned Fig. 2 or step S7 ', described data channel is intercepted, if described data channel is in idle condition, then send packet by described data channel.
Fig. 9 is the signal conflict sequential chart of concealed terminal.Two pairs of nodes in same wireless network have selected same data channel to carry out transfer of data, and wherein first pair of node shaken hands successfully prior to second pair of node, when the access data channel carries out transfer of data, if the transmit leg of second pair of node is in recipient's communication range of first pair of node, then the transmit leg of second pair of node can listen to current transfer of data, automatically keep out of the way NAV and use this data channel to carry out transfer of data after the time, this NAV is that the recipient of first pair of node utilizes the transmission rate of this data channel and the data length of required transmission to calculate the duration that takies this data channel that gets according to first pair of node.If win when the data transmission fails of node retransmitted again owing to some reasons make, because second pair of node can't known this re-transmission to intercepting of first control channel in the process, still in the laggard line data transmission of NAV time, so cause as shown in Figure 9 signal conflict.
In the technical scheme of above-described embodiment, if transmit leg listens to CCTS grouping, comprise the address of second transmit leg and data channel number in this CCTS grouping, but transmit leg does not listen to the CRTS grouping that this second transmit leg sends, then transmit leg judge know own and second transmit leg at a distance of double bounce, with second recipient at a distance of a jumping.At this moment, arrive NAV after the time, transmit leg transfers data channel is intercepted, if described data channel is in idle condition, then can send packet by described data channel.
As seen, utilize the multi-channel collaboration data transmission method of above-described embodiment, because transmit leg also need transfer data channel is intercepted when sending packet to the recipient, so can avoid the signal conflict problem of concealed terminal in the multi-channel collaboration data transmission procedure, make this multi-channel collaboration data transmission method more reliable, effective.
The present invention also provides a kind of multi-channel collaboration data transmission system, comprises dispensing device, receiving system and several candidate's cooperation devices, is specially:
This dispensing device is used for sending the CRTS grouping that carries data channel number by first control channel;
This receiving system is used for after receiving the CRTS grouping, if judge and to know with number corresponding data channel of data channel and can use, then return the CCTS grouping that carries supported high channel speed between dispensing device and the receiving system to dispensing device by first control channel;
Several candidate's cooperation devices are used for cooperation device is intercepted and competed to first control channel, specifically comprise: several candidate's cooperation devices are intercepted the grouping of the CRTS on first control channel and CCTS grouping, if judge know with number corresponding data channel of data channel can with and judge according to high channel speed and to know and self satisfy the cooperation condition, then send the HI grouping of carrying candidate's cooperation device sign by described first control channel according to the access delay corresponding with self;
When receiving system also is used for only receiving a HI grouping in the time interval of setting, identify corresponding candidate's cooperation device as cooperation device with candidate's cooperation device, and in first control channel transmission RACK grouping, the RACK grouping carries the corresponding candidate's cooperation device of candidate's cooperation device that sends this HI grouping and identifies;
Dispensing device also is used for sending packet via cooperation device to receiving system by data channel after receiving the RACK grouping;
Receiving system also is used for returning the ACK grouping by second control channel after successfully receiving packet.
Multi-channel collaboration data transmission system according to above-described embodiment has effectively guaranteed selection real-time and effective data channel and cooperation device, adapts to the characteristics that wireless network moves flexibly; And, can also thoroughly avoid the exposed terminal problem that brought by the ACK transmitted in packets, improved channel utilization greatly, reduced propagation delay time and discarded ratio of packet, efficient, transfer of data reliably can be provided.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a multi-channel collaboration data transmission method is characterized in that, comprising:
Transmit leg sends the request cooperation carry data channel number by first control channel to the recipient and sends the CRTS grouping; After described recipient receives described CRTS grouping, if judge and to know with number corresponding data channel of described data channel and can use, then return the permission that carries supported high channel speed between described transmit leg and the described recipient transmission CCTS that cooperate by first control channel to described transmit leg and divide into groups;
Several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node; Wherein said several candidate's cooperative nodes are intercepted described first control channel, and competition becomes cooperative node and specifically comprises: several candidate's cooperative nodes are to the described CRTS grouping on described first control channel and the described CCTS receipts of dividing into groups to detect, know with number corresponding data channel of described data channel and can use if judge, and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send the cooperation indication HI grouping of carrying candidate's cooperative node sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time;
Described recipient is if only receive a HI grouping in the time interval of setting, then identify corresponding candidate's cooperative node as cooperative node with described candidate's cooperative node, and in described first control channel transmission cooperation affirmation RACK grouping, the corresponding candidate's cooperative node of candidate's cooperative node that described RACK grouping carries this HI grouping of transmission identifies;
Described transmit leg then sends packet via cooperative node to described recipient by described data channel if receive described RACK grouping; After described recipient successfully receives described packet, return affirmation ACK grouping by second control channel; Described recipient is not if successfully receive described packet, then return Negative Acknowledgement NACK grouping by described second control channel, described cooperative node then resends described packet after listening to described NACK grouping, until receiving described ACK grouping.
2. multi-channel collaboration data transmission method according to claim 1 is characterized in that, described method also comprises:
Described recipient then sends to described transmit leg by described first control channel and retransmits indication RI grouping if receive a plurality of HI groupings in the time interval of setting;
After described several candidate's cooperative nodes listen to described RI grouping, random back is selected to resend described HI grouping behind the mini-slot in K mini-slot, wherein K is natural number, only receives a HI grouping until satisfying described recipient in the time interval of setting.
3. multi-channel collaboration data transmission method according to claim 1 is characterized in that, describedly resends described packet and comprises: after reducing transmission rate, resend described packet.
4. multi-channel collaboration data transmission method according to claim 1 is characterized in that, described method also comprises:
Described transmit leg if do not receive the HI grouping, then directly sends described packet to described recipient by described data channel after receiving described CCTS grouping;
Correspondingly, described recipient then returns the ACK grouping by second control channel if successfully receive described packet;
Described recipient then returns the NACK grouping by described second control channel if successfully do not receive described packet; Described transmit leg sends described packet to described recipient again by described data channel after receiving described NACK grouping.
5. multi-channel collaboration data transmission method according to claim 1, it is characterized in that, described transmit leg also comprises before sending the CRTS grouping carry data channel number by first control channel to the recipient: described sender-selected available data channels, wherein said available data channels are the data channel number corresponding data channel that carries in the described CRTS grouping;
Wherein, described sender-selected available data channels comprises:
Described transmit leg is checked the channel use table of local maintenance, comprises described channel number, current state and the used data channel of last transfer of data of candidate data channel in the described channel use table;
If the current state of the used data channel of last transfer of data is idle, selecting it is described available data channels;
If the current state of the used data channel of last transfer of data is then checked i data channel TCH for busy
iCurrent state, wherein i be the ID of transmit leg and recipient's ID sum divided by the remainder of data channel number in the described channel use table, if idle, then selecting it is described available data channels, if busy, then select arbitrary current state to be idle data channel at random.
6. multi-channel collaboration data transmission method according to claim 1 is characterized in that, described method also comprises:
After described recipient receives described CRTS grouping, if judge and know unavailablely with number corresponding data channel of described data channel, then do not do any answer;
Described transmit leg does not receive the CCTS grouping that described recipient returns in the time of setting, then reselect available data channels and send the CRTS grouping.
7. multi-channel collaboration data transmission method according to claim 1 is characterized in that, described method also comprises:
After described recipient receives described CRTS grouping, if judge know unavailable with number corresponding data channel of described data channel, then described recipient reselects an available data channels, then return the CCTS grouping that carries supported high channel speed between described transmit leg and the described recipient by described first control channel to described transmit leg, and the data channel of the available data channels correspondence of reselecting number;
After described transmit leg receives described CCTS grouping, can use if judge the data channel of the described data channel correspondence in the described CCTS grouping, then confirm the CC grouping by described first control channel to described recipient's transmitting channel;
Correspondingly, described several candidate's cooperative nodes to described first control channel intercept, and competition become cooperative node and specifically comprise:
Several candidate's cooperative nodes are intercepted the described CCTS grouping on described first control channel and described CC grouping, if judge know with number corresponding data channel of described data channel can with and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send the HI grouping of carrying candidate's cooperative node sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time.
8. multi-channel collaboration data transmission method according to claim 1 is characterized in that, wherein, described access delay is that described candidate's cooperative node obtains according to the channel quality of described data channel and the loading level of self.
9. according to the arbitrary described multi-channel collaboration data transmission method of claim 1 to 8, it is characterized in that, before sending packet to described recipient, one second transmit leg sends packet by described data channel to one second recipient, and transmit leg judge know its with described second transmit leg at a distance of double bounce, with described second recipient jumping apart, then describedly send packet to described recipient and comprise:
Described data channel is intercepted, if described data channel is in idle condition, then send packet by described data channel.
10. a multi-channel collaboration data transmission system is characterized in that, comprising:
Dispensing device, described dispensing device are used for sending the request cooperation that carries data channel number by first control channel and send the CRTS grouping;
Receiving system, described receiving system is used for after receiving described CRTS grouping, if judge and to know with number corresponding data channel of described data channel and can use, then return the permission that carries supported high channel speed between described dispensing device and the described receiving system transmission CCTS that cooperate by first control channel to described dispensing device and divide into groups;
Several candidate's cooperation devices, described several candidate's cooperation devices become cooperation device for described first control channel being intercepted, also competing; Described wherein several candidate's cooperation devices are intercepted described first control channel, and competition becomes cooperation device and specifically comprises: several candidate's cooperation devices are to the described CRTS grouping on described first control channel and the described CCTS receipts of dividing into groups to detect, know with number corresponding data channel of described data channel and can use if judge, and judge according to described high channel speed and to know and self satisfy the cooperation condition, then send the cooperation indication HI grouping of carrying candidate's cooperation device sign by described first control channel according to improving the corresponding access delay of situation with self cooperation time;
When described receiving system also is used for only receiving a HI grouping in the time interval of setting, identify corresponding candidate's cooperation device as cooperation device with described candidate's cooperation device, and in described first control channel transmission cooperation affirmation RACK grouping, the corresponding candidate's cooperation device of candidate's cooperation device that described RACK grouping carries this HI grouping of transmission identifies;
Described dispensing device also is used for sending packet via cooperation device to described receiving system by described data channel after receiving described RACK grouping;
Described receiving system also is used for after successfully receiving described packet, returns by second control channel and confirms the ACK grouping; If successfully do not receive described packet, then return Negative Acknowledgement NACK grouping by described second control channel;
Described several candidate's cooperation devices then resend described packet after also being used for listening to described NACK grouping, until receiving described ACK grouping.
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| CN102761400B (en) * | 2011-04-29 | 2017-10-31 | 中兴通讯股份有限公司 | The feedback method and system of a kind of radio channel information in wireless network |
| CN102761879B (en) * | 2012-06-21 | 2015-02-25 | 北京邮电大学 | Method for realizing cognizing MAC (Media Access Control) protocol |
| CN103077134B (en) * | 2012-12-27 | 2015-10-28 | 飞天诚信科技股份有限公司 | The method and apparatus of multi-pipe data transmission is realized in a kind of embedded system |
| CN103248436B (en) * | 2013-04-17 | 2015-07-22 | 哈尔滨工程大学 | Method for avoiding hidden terminal and exposed terminal of underwater acoustic communication network |
| US8837515B1 (en) * | 2013-06-06 | 2014-09-16 | Futurewei Technologies, Inc. | System and method for collision resolution |
| CN103326769B (en) * | 2013-06-18 | 2017-02-08 | 北京航空航天大学 | Multi-node cooperative transmission method and system |
| CN105393589B (en) | 2013-09-29 | 2019-08-02 | 华为技术有限公司 | A kind of method and apparatus of data transmission |
| WO2015120579A1 (en) * | 2014-02-11 | 2015-08-20 | 华为技术有限公司 | Data sending method and apparatus |
| CN103874213B (en) * | 2014-03-11 | 2017-11-10 | 新华三技术有限公司 | A kind of channel width system of selection and device |
| CN111132369B (en) * | 2014-09-01 | 2023-10-13 | 华为技术有限公司 | Method for selecting channel and transmitting end |
| CN106792844B (en) * | 2016-11-18 | 2020-11-03 | 新智数字科技有限公司 | Data transmission method and device |
| CN108183783A (en) * | 2017-12-28 | 2018-06-19 | 浙江中智海通信科技有限公司 | Data carrier identity method |
| CN110099413B (en) * | 2019-05-05 | 2023-02-28 | 深圳市鼎晟开元科技有限公司 | Data transmission method, transmission device, reception device, and storage medium |
| CN113840326A (en) * | 2020-06-23 | 2021-12-24 | 华为技术有限公司 | Method and apparatus for forwarding data in a wireless local area network |
| CN116846421B (en) * | 2023-07-04 | 2024-03-08 | 深圳市中航工控半导体有限公司 | Signal processing method and radio control radio frequency chip |
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