CN103095439A - Method and device of two-way cooperation relay transmission data based on network coding - Google Patents
Method and device of two-way cooperation relay transmission data based on network coding Download PDFInfo
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Abstract
An embodiment of the invention discloses a method and a device of two-way cooperation relay transmission data based on network coding. According to the technical scheme, after a relay node decodes received data information, the data information obtained by being decoded is processed in a network coding mode, and the data information processed in the network coding mode is simultaneously sent to all nodes corresponding to current data transmission conversation so that each node corresponding to the current data transmission conversation can obtain the data information sent by a respective correspondent node in the current data transmission conversation in an exclusive OR mode. Therefore, network coding is introduced to a wireless cooperation relay system, and compared with traditional cooperation relay transmission, a transmission resource block is saved, and 25% gain of system handling capacity can be obtained. Meanwhile, the relay node carries out a certain amount of signal processing and simultaneously forwards multi-channel data so that validity and reliability of a network communication system are enhanced.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method and apparatus of two-way cooperating relay transmission data of coding Network Based.
Background technology
Broadband cellular mobile communication system of future generation, be IMT-Advanced (International Mobile Telecommunications-Advanced, IMT-Advanced) system, to adopt traditional wireless relaying technique (as the TypeI relaying) to come extended coverage range, simultaneously, also considering to adopt cooperative relaying technology (as Type II relaying) that the additional space diversity gain is provided, thereby, the spectrum efficiency of raising transmission rate and system.
In realizing process of the present invention, the inventor finds to exist at least in traditional relaying technique following problem:
(1) Type I relaying is mainly used in extended coverage range, can't effectively improve system spectral efficiency;
(2) although Type II relaying can provide extra collaboration spaces diversity gain, more and performance gain is uncertain to the existing standard protocol modification;
(3) no matter be traditional relaying or cooperating relay, all need to guarantee the spectral efficient of relay transmission for repeated link provides extra resource.
The variety of issue that exists in order to solve above relaying technique, in the subsequent normalization process of IMT-Advanced, need to propose a kind of novel wireless relay transmission plan and correlation processing technique, make the relaying technique can extended coverage range, strengthen radio transmission performance, can also improve the spectrum efficiency of wireless transmission, have important researching value, also have great importance.
But, such scheme is not also proposed now.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus of two-way cooperating relay transmission data of coding Network Based, has introduced network code in relay system, has optimized the performance of wireless both-way trunk transmission system.
For achieving the above object, the embodiment of the present invention provides a kind of method of two-way cooperating relay transmission data of coding Network Based on the one hand, comprises the following steps at least:
Via node receives respectively the data message that the corresponding a plurality of nodes of current data transmission session send over;
After described via node was decoded to received data message, the data message that decoding is obtained carried out the network code processing;
Data message after described via node is processed network code (xor operation) sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively.
Preferably, in the two-way cooperating relay scene based on the ARQ agreement, if the current data transmission session comprises first node and Section Point, described method specifically comprises:
Steps A, described via node send data request information to first node;
Step B, described via node receive the data message that described first node returns, and decoding;
Step C, described via node send data request information to Section Point;
Step D, described via node receive the data message that described Section Point returns, and decoding;
The data message that step e, described via node obtain described first node and Section Point decoding carries out network code (xor operation) to be processed;
Data message after step F, described via node are processed network code sends to first node and Section Point simultaneously, so that the mode of first node by XOR gets the data message that described Section Point sends, so that the mode of Section Point by XOR gets the data message that described first node sends;
Repeat above-mentioned steps A to step F, until the current data transmission session finishes.
Preferably, described method also comprises:
After the data message after if described via node is processed network code sends to first node and Section Point simultaneously, if the current data transmission session does not finish, and after the default response time, described via node does not receive the data-message that current data transmission session first node returns, and described via node is to the first node last data message that retransfers;
When described via node received the corresponding data message of described request packet, described via node was proceeded normal processing.
Preferably, the data message that transmits between corresponding each node of described via node and current data transmission session specifically comprises:
Data packet head specifically comprises flag bit, the length information of package number and packet;
Wherein, described flag bit further comprises one or more of following information:
Repeat requests information, the source information of described data message, whether described data message completes the identification information that network code is processed, and whether described data message is the identification information of last packet of current data transmission session.
Preferably, based on TDMA(Time Division Multiple Access, time division multiple access) two-way cooperating relay scene in, if the current data transmission session comprises first node and Section Point, described method specifically comprises:
Steps A, described via node receive at the first time slot the data-message that described first node sends;
Step B, described via node receive at the second time slot the data-message that described Section Point sends;
After the data message that step C, described via node send described first node and described Section Point was decoded, the data message that decoding is obtained carries out network code to be processed;
Step D, the described via node data message after the 3rd time slot is processed network code sends to first node and Section Point simultaneously, so that described first node and the Section Point mode by XOR gets respectively the data message that peer node sends;
Repeat above-mentioned steps A to step D, until the current data transmission session finishes.
On the other hand, the embodiment of the present invention also provides a kind of via node, comprises at least:
Receiver module is used for receiving respectively the data message that the corresponding one or more nodes of current data transmission session send over;
Coding module after being used for received data message is decoded, is processed the data information network coding that decoding obtains;
Sending module, data message after being used for network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively.
On the other hand, the embodiment of the present invention also provides a kind of method of two-way cooperating relay transmission data of coding Network Based, comprises the following steps at least:
The data message that the network node of the corresponding end of current data transmission session sends to via node;
Data message after the network code that the described via node of described network node reception returns is processed;
Described network node is according to the data message that sends, data message after received network code is processed is processed, and the data message of the corresponding data message of different part as the network node transmission of the corresponding other end of current data transmission session received.
Preferably, in the two-way cooperating relay scene based on the ARQ agreement, described method specifically comprises:
When described network node received the request data package of described via node transmission, the data message that described network node is new sent to described via node;
When described network node received the request retransmission bag of described via node transmission, described network node the last time sent to the data message of described via node to retransmit;
Wherein, the data message that transmits between described network node and described via node specifically comprises:
Data packet head specifically comprises flag bit, the length information of package number and packet;
Wherein, described flag bit further comprises one or more of following information:
Repeat requests information, the source information of described data message, whether described data message completes the identification information that network code is processed, and whether described data message is the identification information of last packet of current data transmission session.
Preferably, in the scene based on TDMA, described method specifically comprises:
Described network node determines to distribute to the transfer of data time slot of self;
Described network node sends data-message at corresponding transfer of data time slot to described via node;
The data message of described network node after the network code that the described via node of corresponding data receiver time slot reception sends is processed;
Described network node is according to the data message that certainly sends in nearest transfer of data time slot, data message after received network code is processed is processed, and the data message of the corresponding data message of different part as the network node transmission of the corresponding other end of current data transmission session received.
On the other hand, the embodiment of the present invention also provides a kind of network node, comprises at least:
Sending module is used for the data message that sends to via node;
Receiver module, the data message after being used for receiving network code that described via node returns and processing;
Data acquisition module, for the data message that sends according to described sending module, data message after the received network code of described receiver module is processed is processed, and the data message of the corresponding data message of different part as the network node transmission of the corresponding other end of current data transmission session received.
Compared with prior art, the technical scheme that proposes of the embodiment of the present invention has the following advantages:
by using the technical scheme of the embodiment of the present invention, after via node is decoded to received data message, the data message that decoding is obtained carries out network code (xor operation) processing, and the data message after network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively, thereby, network code is introduced wireless cooperative relay system, compare with traditional cooperating relay transmission, saved a transmission resource block, can obtain 25% system throughput flow gain.Simultaneously, via node carries out certain signal and processes and forward simultaneously multichannel data, improves the network communicating system validity and reliability.
Description of drawings
Fig. 1 is the schematic flow sheet of method of the two-way cooperating relay transmission data of a kind of coding Network Based of proposing of the embodiment of the present invention;
Fig. 2 is that the method for two-way cooperating relay transmission data of a kind of coding Network Based of proposing of the embodiment of the present invention is at the schematic diagram of the handling process of network node side;
The schematic diagram of packet loss, mistake bag appears in Fig. 3 in a kind of point-to-point individual event transmission that proposes of the embodiment of the present invention;
Fig. 4 is the schematic diagram that adds the data handling procedure after the RS channel code and interleaving that the embodiment of the present invention proposes;
Fig. 5 is the experimental result schematic diagram of the application method shown in Figure 4 that proposes of the embodiment of the present invention;
Fig. 6 is that a kind of traditional double is to the schematic diagram of the scene of cooperating relay transmission;
Fig. 7 is the schematic diagram of scene of the two-way cooperating relay transmission data of the coding Network Based that proposes of the embodiment of the present invention
Fig. 8 is the schematic diagram of the data packing process that proposes of the embodiment of the present invention;
Fig. 9 is the schematic diagram of the handling process of the whole agreement of ARQ that proposes of the embodiment of the present invention
Figure 10 is the schematic diagram of a kind of concrete retransmission process process that proposes of the embodiment of the present invention
Figure 11 is the schematic diagram of the tdma frame structure that proposes of the embodiment of the present invention;
Figure 12 is the schematic diagram of time-division slot transmission means under the TDMA scene that proposes of the embodiment of the present invention
Figure 13 is the structural representation of a kind of via node of embodiment of the present invention proposition;
Figure 14 is the structural representation of a kind of network node of embodiment of the present invention proposition.
Embodiment
As stated in the Background Art, due to the existing problem of existing relaying technique, need to propose a kind of novel wireless relay transmission plan and correlation processing technique, make the relaying technique can extended coverage range, strengthen radio transmission performance.
In order to overcome such defective, the embodiment of the present invention has proposed a kind of method of two-way cooperating relay transmission data of coding Network Based, network code is introduced wireless cooperative relay system, compare with traditional cooperating relay transmission, save a transmission resource block, can obtain 25% system throughput flow gain.Simultaneously, via node carries out certain signal and processes and forward simultaneously multichannel data, improves the network communicating system validity and reliability.
At wireless communication field, the network code theory has been broken traditional information processing manner, and it requires the intermediate node on transmission link not only to forward the information that receives, but need to carry out forwarding after corresponding signal is processed again.Because the signal that has increased intermediate node is processed, and the target receiving node can recover the information after these processing, nominal increase power system capacity, the verified minimal cut that can realize network-max-flow transmission, thus effectively strengthen the performance of wireless relay transmission.Transmit for wireless relay, if can the combined with network coding technology, a plurality of wireless users' data are combined transmission simultaneously, and the place carries out necessary signal processing at via node, can effectively reduce the resource overhead of multi-user transmission like this, improve the spectrum efficiency of system transmissions, reduce the complexity of multi-user scene scheduling, thereby the enhancing radio transmission performance, the target of the spectrum efficiency of raising wireless transmission.
The technical scheme that the embodiment of the present invention proposes just is being based on such thinking, has realized the combination of network coding technique and relay transmission technology.
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is clearly and completely described, obviously, described embodiment is only part embodiment of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.
As shown in Figure 1, the schematic flow sheet of the method for the two-way cooperating relay transmission data of a kind of coding Network Based that proposes for the embodiment of the present invention, the method specifically comprises the following steps:
Step S101, via node receive respectively the data message that the corresponding a plurality of nodes of current data transmission session send over.
After step S102, described via node are decoded to received data message, the data information network coding that decoding obtains is processed.
Data message after step S103, described via node are processed network code sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively.
Need to prove, based on ARQ(Automatic Repeat-reQuest, HARQ) in the two-way cooperating relay scene of agreement, if the current data transmission session comprises first node and Section Point, described method specifically comprises:
Steps A, described via node send data request information to first node;
Step B, described via node receive the data message that described first node returns, and decoding;
Step C, described via node send data request information to Section Point;
Step D, described via node receive the data message that described Section Point returns, and decoding;
The data message that step e, described via node obtain described first node and Section Point decoding carries out network code to be processed;
Data message after step F, described via node are processed network code sends to first node and Section Point simultaneously, so that the mode of first node by XOR gets the data message that described Section Point sends, so that the mode of Section Point by XOR gets the data message that described first node sends;
Repeat above-mentioned steps A to step F, until the current data transmission session finishes.
Based on the characteristics of ARQ technology, in the situation that data information transfer is failed, overtime or make mistakes, corresponding processing scheme also comprises the data re-transmission process, and is specific as follows:
After the data message after if described via node is processed network code sends to first node and Section Point simultaneously, if the current data transmission session does not finish, and after the default response time, described via node does not receive the data-message that current data transmission session first node returns, and described via node is to the first node last data message that retransfers;
When described via node received the corresponding data message of described request packet, described via node was proceeded normal processing.
In the technical scheme of above-mentioned application ARQ, the data message that transmits between corresponding each node of described via node and current data transmission session specifically comprises:
Data packet head specifically comprises flag bit, the length information of package number and packet;
Wherein, described flag bit further comprises one or more of following information:
Repeat requests information, the source information of described data message, whether described data message completes the identification information that network code is processed, and whether described data message is the identification information of last packet of current data transmission session.
On the other hand, in the scene based on TDMA, if the current data transmission session comprises first node and Section Point, described method specifically comprises:
Steps A, described via node receive at the first time slot the data-message that described first node sends;
Step B, described via node receive at the second time slot the data-message that described Section Point sends;
After the data message that step C, described via node send described first node and described Section Point is decoded, the data information network coding that decoding obtains is processed;
Data message after step D, described via node process network code sends to first node and Section Point simultaneously, so that described first node and the Section Point mode by XOR gets respectively the data message that peer node sends;
Repeat above-mentioned steps A to step D, until the current data transmission session finishes.
In order to realize above-mentioned technical scheme, in the network node side, also need to carry out corresponding processing scheme adjustment, as shown in Figure 2, the method of the two-way cooperating relay transmission data of a kind of coding Network Based that proposes for the embodiment of the present invention specifically comprises the following steps at the schematic diagram of the handling process of network node side:
The data message that the network node of step S201, the corresponding end of current data transmission session sends to via node.
Data message after the network code that step S202, the described via node of described network node reception return is processed.
Step S203, described network node are according to the data message that sends, data message after received network code is processed is processed, and the data message of the resulting data message of XOR as the network node transmission of the corresponding other end of current data transmission session received.
Corresponding aforesaid explanation, in the two-way cooperating relay scene based on the ARQ agreement, said method also comprises data request process, specifically comprises:
When described network node received the request data package of described via node transmission, described network node sent up-to-date data message to described via node;
Wherein, the data message that transmits between described network node and described via node specifically comprises:
Data packet head specifically comprises flag bit, the length information of package number and packet;
Wherein, described flag bit further comprises one or more of following information:
Repeat requests information, the source information of described data message, whether described data message completes the identification information that network code is processed, and whether described data message is the identification information of last packet of current data transmission session.
Same, corresponding with above stated specification, in the scene based on TDMA, described method specifically comprises:
Described network node determines to distribute to the transfer of data time slot of self;
Described network node sends data-message at corresponding transfer of data time slot to described via node;
The data message of described network node after the network code that the described via node of corresponding data receiver time slot reception sends is processed;
Described network node is according to the data message that certainly sends in nearest transfer of data time slot, data message after received network code is processed is processed, and the data message of the corresponding data message of different part as the network node transmission of the corresponding other end of current data transmission session received.
Compared with prior art, the technical scheme that proposes of the embodiment of the present invention has the following advantages:
by using the technical scheme of the embodiment of the present invention, after via node is decoded to received data message, the data message that decoding is obtained carries out the network code processing, and the data message after network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively, thereby, network code is introduced wireless cooperative relay system, compare with traditional cooperating relay transmission, saved a transfer resource fast, can obtain 25% system throughput flow gain.Simultaneously, via node carries out certain signal and processes and forward simultaneously multichannel data, improves the network communicating system validity and reliability.
Below, in conjunction with concrete application scenarios, the technical scheme that the embodiment of the present invention is proposed describes.
At first, based on to the analysis of GNU Radio as can be known, do not have the signal of channel code and interleaving to process in the transport module of existing radio platforms, so noise robustness is relatively poor.Can go out first packet loss mistake bag in transmitting procedure, when a plurality of points sent mutually at times, this situation was especially serious, as shown in Figure 3, and for occurring the example of packet loss, mistake bag in a kind of point-to-point individual event transmission.
As shown in Figure 1, occurred ok=False in figure, mistake appears in this packet that expression receives, and has received altogether 74 packets, but the correct packet that receives only has 60, has 14 data to contract out and has showed error code.And also can observe from experiment, when error code occurring, generally, be all that a lot of bit sequence of ining succession makes a mistake, and analysis is to have influence on the transmission of continuous one piece of data due to long-term decline valley point.
So, before modulation signal, consider to add RS(Reed-Solomon) and channel code and interleaving, to improve the validity and reliability of transmission.
The RS coding is the very strong nonbinary BCH code of a class error correcting capability, can correct random error and burst error.The theory of RS coding is very ripe, no longer is described in detail coding principle here.
On system platform, use be the encoding setting of (255,239), namely the length of packet is 256 bytes, effectively message length is 239 bytes, remaining as check bit, error correcting capability is 8.Because the RS coding is only effective when detecting and proofreading and correct single or a small amount of mistake string, mistake appears and often occur a series of bit sequence in experiment, so, after chnnel coding, add the processing that interweaves, make error code disperse, thereby improve the possibility that error code is repaired.In test, interweave in use is relatively simple, interleave depth is 8.
Add after the RS channel code and interleaving data handling procedure as shown in Figure 4.
Corresponding experimental result as shown in Figure 5, transmitting terminal has sent altogether 4507 packets, the phenomenon of packet loss and mistake bag does not appear in whole correct receptions.
In order to realize above-mentioned effect, need to adjust concrete system architecture, concrete, the system platform that the embodiment of the present invention proposes is for installing UHD-003.003.002, GNURadio3.5.1 and some other dependence library file on Fedora13.
As shown in table 1, the basic configuration information of a kind of Software Radio platform that proposes for the embodiment of the present invention.
Table 1 hardware platform configuration parameter
Concrete, control respectively three USRP with three PCs, simulate two user nodes and a via node, build the wireless both-way trunk scene.
For convenience of description, the embodiment of the present invention with traditional double to the scene of cooperating relay transmission as a comparison, as shown in Figure 6, wherein node A and Node B need to be intercoursed information, X
AAnd X
BBe respectively node A and B and want the information that sends.Apart from too far away or channel condition is relatively poor, can not get by direct transferring the other side's information, so need the communication for coordination of via node R to help complete information exchange (relaying works under the DF mode) due to A and B.As can be seen from the figure, traditional double needs 4 time slots just can complete the exchange of information between two node A and B to cooperating relay transmission.
And the two-way cooperating relay transmission scheme of the coding Network Based that proposes for the embodiment of the present invention, after via node receives respectively the information that two source nodes send over, decode, network code (XOR XOR), then with same processing, the bit stream of XOR is sent (as shown in Figure 7).Node A passes through
Obtain the information that Node B sends, Node B is passed through
Obtain the information that node A sends.
As previously mentioned, there are two kinds of concrete ways of realization in the technical scheme that the embodiment of the present invention proposes, below is specifically described.
Scene one, based on the application scenarios of ARQ agreement.
The ARQ agreement that the embodiment of the present invention is mentioned can as the case may be, select whether to use network coding technique.The below introduces the Design and implementation of this agreement in detail.
Based on the packet of the network code (digital bit XOR XOR) of ARQ agreement, the packet header unification is set to 6bytes, comprises flag bit, and the information such as length of package number and packet are specifically as shown in table 2.
Table 2Header
Wherein, flag bit indicates packet and which node to be sent, whether to be done a series of information such as network code by.Used request retransmission mechanism to guarantee the reliability of transmitting in agreement, to protect correct coding and the decoding of digital bit XOR card network code, so indicate respectively the information of the data packet coding of two nodes with two bytes.In addition, the effective information length that shows packet with a byte.
Further, the formation of description flags position, in concrete application scenarios, flag bit (header[0]) has 8, and the implication of each is as shown in table 3 below.
Table 3Flag
| RQA | RQB | R_BIT | QA | QB | NC | LIB | AGAIN |
RQA=0x01, expression requesting node A sends information;
RQB=0x02, expression requesting node B sends information;
R_BIT=0x04 represents that this packet is sent by via node R;
QA=0x08 represents that this packet is sent by node A;
QB=0x10 represents that this packet is sent by Node B;
NC=0x20, the expression packet has carried out the processing of network code;
LIB=0x40 represents that certain node once sends last packet of data, during this flag set, needs to revise the set of RQA or RQB;
AGAIN=0x80 represents the request retransmission sign, is used for distinguishing request packet and the Back_Request packet at via node place.
The below sends or two kinds of different situations of receive data from node respectively, specifically sets forth the design of flag bit.
As two node A and B, and via node R is during as transmitting terminal, before sending packet, the capital is according to the type that sends packet, corresponding protocol header is set, the concrete way that arranges is first to all position zero of protocol header, and then corresponding data bit is set according to specific circumstances, is operating as xor operation.Such as, via node R need to send the packet of a request retransmission, requesting node A resends the data of last transmission, being set to of so corresponding protocol header: Header[0]=0|RQA|R_BIT|NC|AGAIN, this setting is equivalent to: header[0]=0|0x01|0x04|0x20|0x80, wherein header[0] be the protocol header in packet.
The concrete creation method of flag bit is as follows:
To be protocol header carry out and operation from different information bits positions the method for the setting of receiving terminal flag bit, the information bit of acquisition LIB as follows.
LIB=header_first&self.LIB
Often receive packet, all can analyze protocol header, analytical method is from packet, protocol header to be extracted, and carries out data and operation with corresponding data bit, makes a concrete analysis of as follows:
In the above-mentioned packet that receives, header_first is the protocol header in the packet of receiving, carry out and operation with corresponding data bit respectively, and according to this setting as a result and return to corresponding information.
Because network code can't stand the higher error rate and packet loss, guarantee so added request retransmission mechanism in this agreement the correctness transmitted, and network code is applied in the bi-directional relaying scene, can select whether to use according to actual conditions the network code of digital bit XOR, so, in this agreement, whether the kind of packet needs respectively according to the character of the purposes of bag, affiliated node and distinguishes with network code.
Can be divided into three kinds according to the purposes of bag, be respectively: Request, Back_Request, Data, new data, request retransmission and the packet of expression request transmission respectively.
Request bag expression node has correctly been received all packets that sent, and request the other side sends new packet.
Back_Request represents that the packet of receiving for the last time makes mistakes, and perhaps the sequence number of bag is not right, and packet loss has appearred in judgement, and request the other side node transmits the packet of last transmission again.
Contain the new data message that node need to send to the other side in the Data bag, or be stored in the data bag that had sent in buffer memory, respectively corresponding request bag and Back_Request bag.
It can be divided into relay data bag and node data bag according to the character of node under packet.
According to whether using network coding technique, can be divided into network code bag and non-network code bag.
The below will specifically describe the design in the packet header of every type of packet.
(1) the Data bag of via node place's use network coding technique
Table 4Header
Wherein, ask on the implication of Flag to explain, the concrete setting is that the position of set is respectively:
RQA or RQB: after expression sent this packet, requesting node A or Node B sent information;
R_BIT: represent that this packet is sent by via node R;
NC: represent that this packet done the processing of network code;
LIB: decide according to concrete condition, if last packet of this transmission, set;
The Data bag has been done the processing of network code, the information that contains respectively node A and Node B, so, the package number that represents the node A of participation network coding with Packet_Id_A, Packet_Id_B represents the package number of the Node B of participation network coding, the factor data packet number has occupied two data bit, can represent 2 altogether
16=65536 packets, wherein package number 0 and 32767 is used for respectively doing the information bit of the new packet of the request retransmission of node A and Node B, can describe in detail in this paper back, and Length is used for representing the total length of this packet.
(2) the relaying place does not use the Data bag of network coding technique.
Do not use the Data bag of network coding technique consistent with the Data bag head-coating structure that uses network code, it is NC position zero in Flag, and the Data bag only comprises the information of some nodes, so if be transmitted to the packet of node A, only Packet_id_A need to be set, Packet_id_B puts sky, and the packet that is transmitted to Node B is also corresponding setting.
(3) Request at via node place bag and Back_Request wrap.
The packet header design of these two kinds request bags is basic identical, indicates to distinguish Request bag or Back_Request bag according to the AGAIN in flag bit.Arranging of Flag is as follows:
RQA, RQB: send new packet setting according to requesting node A or Node B;
R_BIT: by the packet that via node sends, need to put 1;
AGAIN: if the Request bag sets to 0, if the Back_Request bag puts 1;
Packet_Id_A represents the package number of the current node A that receives, and Packet_Id_B represents the package number of the current Node B of receiving.
(4) Data of Nodes bag
The packet header of the packet of node A and Node B arranges the setting in the packet header that is similar to the via node R that does not do the network code processing, is also to take 6 data bit.Header[0] arrange as follows:
RQA, RQB: this paper tests distant between wireless transmitting system hypothesis node A used and Node B or channel condition is relatively poor, and the link that do not direct transfer is so this two positions 0;
QA, QB: be that node A or Node B are carried out corresponding setting according to what send packet;
Packet_Id: represent the numbering of the packet of this node transmission, the Serial Number Range of node A is 1-32767, and the scope of the package number of Node B is 32769-65535;
Packet_Id_ELSE: represent paid-in the other side's node data packet number.
(5) Back_Request of Nodes bag
Be similar to the Data bag, arranging of Flag is as follows:
QA, QB: the node that transmits new packet according to the request of transmission is that node A or Node B are carried out corresponding setting;
Packet_Id: the numbering that represents the packet of this node transmission;
Packet_Id_ELSE: represent paid-in the other side's node data packet number;
Like this, the via node of receiving the packet that this request transmission is new just can judge whether according to the information of Flag it is to follow own request data package, package number according to Packet_Id receives the information that this node transmits, judge the data of another node that this node has received according to Packet_Id_ELSE, and then judge the packet that next step should send to this node.
After designing above-mentioned packet header, enclose the data message that need to send, and be CRC and process, and through after the RS chnnel coding, the modules such as modulation, frequency conversion of calling GNU Radio send by USRP.Concrete data packing process as shown in Figure 8.
Wherein, Data is the information that node need to send to the other side, and length can be determined with the parameter of chnnel coding according to specific needs.CRC is for carrying out the CRC32 operation to header and payload, take 4bytes, through carrying out the network code operation to the Length position in Header and Data and CRC check position after CRC, in Header, other information bits beyond data packet length are not carried out the network code operation, after carrying out network code, whole packet is carried out the RS chnnel coding.Hereinafter will the Design and implementation of network code be described in detail.
In embodiments of the present invention, the packet that the correspondence of node A and Node B is set carries out the network code operation, and for example: the 32769 number bags that the 1 number bag that node A sends and Node B send carry out network code.
According to the randomness of node A and Node B the transmission of data, need the following two kinds of situations of judgement: different and certain node of the data packet length of node A and Node B has been completed all transfer of data.
In the first situation, at via node R place, after correctly receiving respectively packet corresponding to node A and Node B, first the length of two packets judged that (generally, when transfer files or video, the length of the packet is identical, only certain node sends last packet), if the length of two packets is identical, directly carry out the network code operation of digital bit XOR, as follows:
If the length of packet is not identical, shorter packet is carried out the zero padding operation, make the length of two packets identical, and then carry out above-mentioned xor operation.
At node A and Node B place, after receiving the network code bag that via node R sends, first take out the package number in packet header, and seek the packet of identical numbering in this locality, if find, content with Length in the length of local packets and network coding packet header is carried out XOR, obtain the length of the other side's node data bag, if identical with the length of this locality bag, directly carry out xor operation with two packets, obtain the packet that sends with the other side's node, this process with do network code or operate identical.If the length information that XOR obtains wraps greater than this locality, illustrate that there is the zero padding operation at the via node place, so carry out xor operation after the same zero padding of Nodes, obtains the full detail of the other side's node.Concrete operations are as follows:
In the second situation, if a certain node sends all information, only need to receive the other side's packet, still send empty bag, but in flag bit, the set of network code is 0, show and no longer carry out the network code operation.
Network code transfer process based on ARQ is, source node A and B send respectively the packet of several equal numbers to relaying, and relaying carries out demodulation, decodes, unpacks the data of receiving, then the packet of correspondence is carried out being broadcast to source node after xor operation.Source node is received the packet of repeat broadcast, and its packet with oneself is carried out xor operation, solves the other side's information.
For fear of bumping, adopt the ARQ of stop-and-wait.After stop and wait ARQ refers to that the Packet Generation of transmit leg is completed, wait for recipient's status report, receive that the report of the Packet Generation success that the other side sends just sends follow-up packet afterwards, otherwise retransmit this packet.We adopt similar agreement, that is: after node is received the packet that sends to oneself, just own corresponding Packet Generation can be gone out, otherwise, send a request retransmission to the other side.Specific practice is: during relay forwarding adopts, secondary request bag to the mode of node, is avoided node or relaying to give out a contract for a project simultaneously and is produced the problem of conflict.Relaying first sends a data request to node A, after node A receives request of data, send packet, numbering is since 1, after relaying is received the packet of A, broadcasting is gone out, A, B receive this packet simultaneously, and B is through confirming that this is after relaying is issued the bag of oneself, and the storage data also send the data packing that oneself will send, coding so circulates since 32769.When node sent to relaying packet loss to occur, then relaying place wait timeout sent a data request to node, and node begins to send new packet, and communication rebulids.Relaying sends to when packet loss occurring in the process of node, and same, node can not receive the bag of relaying, just can not send the data of oneself, until the overtime transmission request of data of relaying is set up new communication.The flow process of whole agreement as shown in Figure 9.
Do not carry out the transmission means that network code is processed, Protocol Design is fairly simple, each node sends data packets successively according to the order according to packet number corresponding to number, the package number of node A is from 1-32767 equally, the scope of the package number of Node B is 32769-65535, via node R forwards the data packets of the node that receives, if package number is not right, illustrate and the packet loss phenomenon occurs, perhaps the mistake bag appears in CRC check, node all can send the packet of a request retransmission, perhaps needs to ask the other side to send new packet.Concrete flow process as shown in figure 10.
The advantage of ARQ-network code agreement is that can decide with how many packets according to cache size or actual use scenes be the operation that unit carries out the primary network coding, and can select flexibly whether to use network code according to actual conditions.But channel utilization is relatively low.And the intrinsic defective of USRP platform of using due to this paper, owing to receiving and dispatching frequently conversion between source node and via node, after transmitting-receiving conversion each time, the Software Radio platform of USRP need to re-start bit synchronization, thereby conversion causes can't bit synchronization occurring frequently the data message of large section and makes mistakes frequently, the perhaps situation of whole data-bag lost, this causes again retransmitting frequently certain packet, and these all will affect the stability of a system.
Because the point-to-point transmission of platform of the software radio that uses USRP is all comparatively stable, so we adopt the mode of TDD to verify the performance of network code in bi-directional relaying, hereinafter will be to this detailed introduction.
Scene two, TDMA scene.
Time division multiple access access (TDMA) is the access module under a kind of shared network resource scene.Transmitter sends data one by one in limited very brief time slot, so the TDMA agreement makes a frequency resource can support a plurality of concurrent data channels.Figure 11 has shown a tdma frame structure, and at first data flow is divided into frame, and then frame is divided into time slot.These time slots all contain one and are used for synchronous protection time slot.
On the Software Radio platform of GNU Radio, we dispose TDMA with the Python script of benchmark_tx.py and benchmark_rx.py, and the sending module of benchmark_tx.py sends packet by daughter board and do not need the other side's ACK.The receiver module of benchmark_rx.py is always operating under listen mode, in case there are data to arrive, USRP will receive and carry out CRC check, and prints the numbering of bag.Being implemented as follows of TDMA algorithm:
Node A sends data at time slot 1 to relaying R, and Node B sends data at time slot 2 to relaying R, and to node A, B sends data to via node R at time slot 3, so circulation.
Suppose distant between node A and Node B, can't direct communication, namely node A ignores the information that Node B sends to via node R, and the rest may be inferred.
Via node R carries out demodulating and decoding to the node A that receives and the data of Node B, and carries out xor operation, if the length of packet is not mated, short packet is done after the zero padding operation XOR again.
Due to the defective of platform self, the transmission certain hour is set in flow graph, i.e. time slot, but in reality, data send to USRP by network interface card and finally send time of needing greater than this slot length, so be provided with certain protection bandwidth.
As shown in figure 12, be the schematic diagram of time-division slot transmission means under the TDMA scene.
The left resource that Dai Biao whether not add network code that parts on the right side of Figure 12 is distributed.Wherein, in the transmission plan that has added the network code algorithm, at time slot 1 and time slot 2, node A and Node B are broadcasted respectively the own information that will send, and via node receives respectively and store information; Time slot 3, via node are with the A of storage, and the information of B is carried out XOR and broadcast away, and node A and Node B receive after the broadcast message that relaying sends over original oneself information and do the XOR xor operation, obtain the information of the node of correspondence.Like this, whole process only needs three time slots just to complete information exchange.And in traditional transmission means, as the right half part of figure, need 4 time slots just can complete information exchange.
Compared with prior art, the technical scheme that proposes of the embodiment of the present invention has the following advantages:
by using the technical scheme of the embodiment of the present invention, after via node is decoded to received data message, the data message that decoding is obtained carries out the network code processing, and the data message after network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively, thereby, network code is introduced wireless cooperative relay system, compare with traditional cooperating relay transmission, saved a transfer resource fast, can obtain 25% system throughput flow gain.Simultaneously, via node carries out certain signal and processes and forward simultaneously multichannel data, improves the network communicating system validity and reliability.
In order to realize the technical scheme of the embodiment of the present invention, the embodiment of the present invention also provides a kind of via node, and its structural representation comprises as shown in figure 13 at least:
Sending module 133, data message after being used for network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively.
On the other hand, the embodiment of the present invention also provides a kind of network node, and its structural representation comprises as shown in figure 14 at least:
Sending module 141 is used for the data message that sends to via node;
Compared with prior art, the technical scheme that proposes of the embodiment of the present invention has the following advantages:
by using the technical scheme of the embodiment of the present invention, after via node is decoded to received data message, the data message that decoding is obtained carries out the network code processing, and the data message after network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively, thereby, network code is introduced wireless cooperative relay system, compare with traditional cooperating relay transmission, saved a transfer resource fast, can obtain 25% system throughput flow gain.Simultaneously, via node carries out certain signal and processes and forward simultaneously multichannel data, improves the network communicating system validity and reliability.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, or network equipment etc.) each implements the described method of scene to carry out the embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is a preferred schematic diagram of implementing scene, the module in accompanying drawing or flow process might not be that the enforcement embodiment of the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device of implementing in scene can be distributed in the device of implementing scene according to implementing scene description, also can carry out respective change and be arranged in the one or more devices that are different from this enforcement scene.The module of above-mentioned enforcement scene can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number does not represent just to description the quality of implementing scene.
Above disclosed be only the several concrete enforcement scene of the embodiment of the present invention, still, the embodiment of the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into the traffic limits scope of the embodiment of the present invention.
Claims (10)
1. the method for the two-way cooperating relay transmission data of a coding Network Based, is characterized in that, comprises the following steps at least:
Via node receives respectively the data message that the corresponding one or more nodes of current data transmission session send over;
After described via node was decoded to received data message, the data message that decoding is obtained carried out the network code processing;
Data message after described via node is processed network code sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively.
2. the method for claim 1, is characterized in that, in the two-way cooperating relay scene based on HARQ ARQ agreement, if the current data transmission session comprises first node and Section Point, described method specifically comprises:
Steps A, described via node send data request information to first node;
Step B, described via node receive the data message that described first node returns, and decoding;
Step C, described via node send data request information to Section Point;
Step D, described via node receive the data message that described Section Point returns, and decoding;
The data message that step e, described via node obtain described first node and Section Point decoding carries out network code to be processed;
Data message after step F, described via node are processed network code sends to first node and Section Point simultaneously, so that the mode of first node by XOR gets the data message that described Section Point sends, so that the mode of Section Point by XOR gets the data message that described first node sends;
Repeat above-mentioned steps A to step F, until the current data transmission session finishes.
3. method as claimed in claim 2, is characterized in that, also comprises:
After the data message after if described via node is processed network code sends to first node and Section Point simultaneously, if the current data transmission session does not finish, and after the default response time, described via node does not receive the data-message that current data transmission session first node returns, and described via node is to the first node last data message that retransfers;
When described via node received the corresponding data message of described request packet, described via node was proceeded normal processing.
4. method as claimed in claim 2 or claim 3, is characterized in that, the data message that transmits between corresponding each node of described via node and current data transmission session specifically comprises:
Data packet head specifically comprises flag bit, the length information of package number and packet;
Wherein, described flag bit further comprises one or more of following information:
Repeat requests information, the source information of described data message, whether described data message completes the identification information that network code is processed, and whether described data message is the identification information of last packet of current data transmission session.
5. the method for claim 1, is characterized in that, in the two-way cooperating relay scene based on time division multiple access TDMA, if the current data transmission session comprises first node and Section Point, described method specifically comprises:
Steps A, described via node receive at the first time slot the data-message that described first node sends;
Step B, described via node receive at the second time slot the data-message that described Section Point sends;
After the data message that step C, described via node send described first node and described Section Point was decoded, the data message that decoding is obtained carries out network code to be processed;
Step D, the described via node data message after the 3rd time slot is processed network code sends to first node and Section Point simultaneously, so that described first node and the Section Point mode by XOR gets respectively the data message that peer node sends;
Repeat above-mentioned steps A to step D, until the current data transmission session finishes.
6. a via node, is characterized in that, comprises at least:
Receiver module is used for receiving respectively the data message that the corresponding one or more nodes of current data transmission session send over;
Coding module, after being used for received data message is decoded, the data message that decoding is obtained carries out the network code processing;
Sending module, data message after being used for network code is processed sends to corresponding all nodes of current data transmission session simultaneously, so that corresponding each node of current data transmission session gets by the mode of XOR the data message that the peer node in each comfortable current data transmission session sends respectively.
7. the method for the two-way cooperating relay transmission data of a coding Network Based, is characterized in that, comprises the following steps at least:
The data message that current data transmission session institute map network node sends to via node respectively;
Data message after the network code that the described via node of described network node reception returns is processed;
Described network node is according to the data message that sends, data message after received network code is processed is processed, and the corresponding data message of data that the phase XOR is obtained receives as the data message that the network node of the corresponding other end of current data transmission session sends.
8. method as claimed in claim 7, is characterized in that, in the two-way cooperating relay scene based on the ARQ agreement, described method specifically comprises:
When described network node received the request data package of described via node transmission, described network node sent up-to-date data message to described via node;
When described network node received the request retransmission bag of described via node transmission, described network node the last time sent to the data message of described via node to retransmit;
Wherein, the data message that transmits between described network node and described via node specifically comprises:
Data packet head specifically comprises flag bit, the length information of package number and packet;
Wherein, described flag bit further comprises one or more of following information:
Repeat requests information, the source information of described data message, whether described data message completes the identification information that network code is processed, and whether described data message is the identification information of last packet of current data transmission session.
9. method as claimed in claim 7, is characterized in that, in the two-way cooperating relay scene based on TDMA, described method specifically comprises:
Described network node determines to distribute to the transfer of data time slot of self;
Described network node sends data-message at corresponding transfer of data time slot to described via node;
The data message of described network node after the network code that the described via node of corresponding data receiver time slot reception sends is processed;
Described network node is according to the data message that certainly sends in nearest transfer of data time slot, data message after received network code is processed is processed, and the corresponding data message that the phase XOR is obtained receives as the data message that the network node of the corresponding other end of current data transmission session sends.
10. a network node, is characterized in that, comprises at least:
Sending module is used for the data message that sends to via node;
Receiver module, the data message after being used for receiving network code that described via node returns and processing;
Data acquisition module, for the data message that sends according to described sending module, data message after the received network code of described receiver module is processed is processed, and the corresponding data message that the phase XOR is obtained receives as the data message that the network node of the corresponding other end of current data transmission session sends.
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