CN101835172A - Method for carrying out grouping cooperative communication on multiple users based on network encoding technology - Google Patents
Method for carrying out grouping cooperative communication on multiple users based on network encoding technology Download PDFInfo
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Abstract
The invention relates to a method for carrying out grouping cooperative communication on multiple users based on network encoding technology, which means that grouping is carried out on the multiple users in a special grouping way in a cellular relay network; then, each group of user data is encoded and transmitted by a relay node through the network encoding technology, so that the relay transmission efficiency is improved, and the problem of low relay upstream transmission efficiency can be solved; and when the user is positioned at the edge of a subdistrict, the method can improve the transmission performance, and the coverage range of a base station in the whole subdistrict is enlarged. The method comprises the operation steps of: setting the functions of the relay node in an initialized way, channel estimation and base station selection, judgment of a cooperative partner, grouping transmission executed by the user and self-adaptive centralized control executed by the base station. The method fully utilizes the channel characteristics of cellular cell users, and can be used for grouping the multiple users, thus practically improving the relay transmission efficiency and the transmission performance of the edge user, and reducing the outage probability of the system.
Description
Technical field
The present invention relates to a kind of implementation method that is used for multi-user's transmitted in packets of honeycomb junction network, exactly, relate to a kind of coding techniques Network Based carries out grouping cooperative communication to the multi-user method.Honeycomb at resource-constrained moves relay system, and this method has improved the resource utilization and the transmission performance of ascending communication system, belongs to the collaboration communication technical field in the radio communication.
Background technology
The bandwidth resources of wireless communication system and power resource are all very limited, and the system spectrum utilance at cellular cell edge is very low.Modal solution is to use relaying technique.In each cellular cell, between base station and the Cell Edge User switching node that some have the signal specific processing capacity, i.e. via node can be set.The setting of via node both can help the cell edge user to transmit data, improved transmission reliability, can provide diversity gain again, resisted wireless channel effectively and inevitably declined.Via node is usually located at 1/3 distance of cell edge, is used for transmitting the information of edge customer.User terminal utilizes the assistance transmission information of via node again in the transmission self information.Like this, in the transmission information process, each user terminal utilizes the space channel of own and via node simultaneously, obtains certain space diversity gain.In collaboration communication, via node can adopt and comprise that decoding is transmitted, amplification is transmitted and the multiple pass-through mode of coding cooperative assists information source that signal is sent to the stay of two nights, and the number of via node can be one or more.
Existing relaying technique considers that normally all via nodes all adopt the mode of time-division or frequency division, and forwarding etc. is transmitted, amplified to pass-through mode for decoding, and it is limited to send gross power (being information source transmitted power and each relaying repeating power sum).Though improved reliability of information transmission like this, caused resource utilization to reduce.Yet, if adopt the network coding technique of current hot topic, can effectively utilize the characteristics of via node, improve the transfer capability of via node, thereby improve the overall performance of network multi-user information, reduce the waste of resource.The principle of network coding technique is that via node is before forwarding information, earlier the information in the different paths that receive is carried out network code, the prerequisite of this operation is that information must be the raw information of recovering through being correctly decoded, otherwise can produce error propagation, causes the error rate of system to increase.This novel encoding operation has not only solved the bottleneck problem of the relay transmission of wireless network, simultaneously, has also improved the capacity and the robustness of network greatly.
At multi-user's effective network coding technique prematurity still, some technology just propose will carry out network code to multi-user's system, but do not propose the specific embodiments of effective network code in the current wireless communication.In addition, the network code under not all channel status all can bring benefit.Channel status at different user should be taked different strategies, just will adopt a kind of adaptive network code scheme.Therefore how the different channels state according to the user carries out the network code transmission, has become the focus that those skilled in the art pay close attention to.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of coding techniques Network Based that is used for the honeycomb junction network carries out grouping cooperative communication to the multi-user method, this method is in the honeycomb junction network, by special packet mode the multi-user is divided into groups, via node adopts network coding technique that every group of user data carried out coding transmission then, and last base station receives data and decoding.This method has made full use of the channel characteristics of honeycomb residence user, can improve the transmission performance of relay transmission efficient and edge customer conscientiously, reduces the system break probability.
In order to reach the foregoing invention purpose, the invention provides a kind of coding techniques Network Based that is used for the honeycomb junction network carries out grouping cooperative communication to the multi-user method, it is characterized in that: the multi-user is divided into groups, and solve the inefficient problem of relaying uplink in conjunction with network coding technique; And when the user was positioned at cell edge, this method can be improved its transmission performance, increased the coverage of base station in whole sub-district; Described method comprises following operating procedure:
(1) initialization is provided with the via node function: the via node of each cellular cell all is provided with the function of network code, makes via node use network coding technique that transmission signals is handled, with spread signal transmission range and raising throughput of system; In addition, via node keeps original coding and decoding function and the function of separating the mediation modulation to received signal;
(2) channel estimating and base station selected, judgement affiliate: via node carries out uplink channel estimation to the channel between user and the relaying, and the base station is carried out uplink channel estimation respectively to the channel that direct transfers between channeling and trunking node and the base station between user and the base station; After the base station obtains the channel condition information of via node feedback, judge whether the user carries out the network code operation of via node, comprehensive more original channel condition information, after the user grouping situation that needs are carried out the network code operation is adjudicated, last group result information is fed back to via node and user respectively;
(3) user carries out transmitted in packets: according to the grouping information of base station feedback, the user begins to send data according to group result, after via node receives the data that the user sends, the grouping information that provides according to the base station, the every group of user who carries out the network code operation adopted the network code operation, the user who does not carry out the network code operation is adopted traditional relaying strategy; Then, after via node is carried out corresponding Data Stream Processing, send coded data, and decode by the base station to the base station;
(4) the self adaptation centralized control is carried out in the base station: according to user's moving state, when the user leaves this relay services sub-district and moves to adjacent relay services sub-district, when perhaps new user moves to this relay services sub-district, the base station all dynamically updates all users' of this relay services sub-district channel condition information, return operation base station selected in the execution in step (2), the judgement affiliate again, realize the collaboration communication that network code divides into groups again.
Between described user and the via node, between user and the base station and the communication between via node and the base station all adopt time division way, distinguish with orthogonal resource.
Described network code operation is that the transmission network coded data was to obtain the network code gain after via node carried out the network code operation to the data of two user's transmissions in each grouping; The particular content of described network code operation is for superposeing or other simple linear operation by bit XOR, physics.
Described step (2) further comprises following content of operation:
(21) via node carries out uplink channel estimation to the channel between user and the relaying, obtain channel condition information after, feed back to the base station; The base station judges according to these channel condition informations whether the user adopts the network code division operation of via node: be not less than the threshold value that via node is correctly decoded if this user inserts the channel signal to noise ratio of relaying, then this user adopts the transmission means that relaying inserts, and uses the network code grouping strategy that the user is carried out transmitted in packets; Otherwise, adopt traditional relay transmission strategy;
(22) base station is carried out uplink channel estimation respectively to the channel between channeling and trunking and the base station of direct transferring between user and the base station and is obtained channel condition information, direct transfer to the base station estimated information of channel of the court verdict of comprehensive again relaying feedback and user, the user grouping of network code operation is carried out in the base station to needs, after finishing grouping, via node and user are given with the group result feedback information of judgement in the base station.
In the described step (21), the base station judges that whether the user adopts the foundation of the network code division operation of via node is the threshold value whether channel status between user and the relaying satisfies default.
In the described step (22), it is to guarantee that the base station just can obtain initial data by simple decode operation that the purpose that the user of network code operation divides into groups is carried out to needs in the base station, promptly Xie Ma difficulty is too not complicated, just can improve throughput of system, reduce the system break probability; The grouping strategy of selecting for use is: divide into groups to the channel quality that direct transfers of base station according to the user.
The described strategy that divides into groups to the channel quality that direct transfers of base station according to the user is that to make the average interrupt probability of system be minimum, just makes target function: the average interrupt probability
Obtain minimum value, in the formula,
When expression user j and another user N+1-j are divided into one group, use the outage probability of the relaying pass-through mode of coding Network Based; Its subscript natural number j is user's sequence number, and its maximum is n, and the total number of users order is N=2n, and subscript NC (Network Coding) represents network code; Therefore, to the optimum group technology of the channel quality grouping of direct transferring of base station be according to the user: the user that the channel quality that will direct transfer is best and direct transfer channel quality the poorest user is divided into a group, remaining continuation is according to this method grouping, till having divided; But when the number of users that satisfies the grouping requirement was odd number, then via node was directly transmitted the best user's data of channel status that direct transfers, and remaining user adopts above-mentioned grouping strategy to divide into groups.
Described step (3) further comprises following content of operation:
(31) user is according to the grouping information of base station feedback, finds its pairing user, and begins the branch time slot and send data to relaying and base station; In enough time slots, for the user who carries out network code grouping, after via node receives the data that every group of two users send, carry out the network code operation earlier, again coded data is carried out chnnel coding, then result data is transmitted to the base station, up to the transmission of finishing all grouping user; For the user who does not carry out network code, traditional relay transmission mode is then used in the base station, after promptly via node receives this user's data, only carries out chnnel coding, is transmitted to the base station then, up to the transmission of finishing these users;
(32) base station is according to known user grouping information, and the coded information stream behind the network code that receives is carried out the decoding processing of channel-decoding and network code, obtains the primary data information (pdi) of grouping user; To adopting traditional trunking scheme to send the user of data, channel-decoding is only carried out in the base station just can obtain initial data; If user data is not directly received, do not come out by base station decodes yet by the base station, then this user should broadcast its data again.
Described step (4) further comprises following content of operation:
(41) leave former relay services sub-district because move as the user, and when entering another via node overlay area, after the base station judges that this user has been in the relaying switch area, this subscriber channel state information should be cancelled in former relay services sub-district, in new relay services sub-district, reappraise this subscriber channel state information, carry out new network code grouping judgement in its base station and via node then; Or
(42) enter this relay services sub-district because move as new user, then base station and via node should carry out uplink channel estimation to this user again, obtain the channel condition information of channel between its new straight chain channel and user and the relaying, just upgrade the channel condition information of this user, carry out the transmitted in packets of coding Network Based so that divide into groups again in the base station;
(43) in case take place to make the channel status of this relay services sub-district change because of the user moves, base station and via node all will carry out uplink channel estimation again, upgrade the channel condition information table of base station, re-execute the grouping judgement then, network coding technique is used in whole cellular cell to greatest extent.
The present invention is a kind of method of multi-user's grouping cooperative transmission of coding Network Based in the honeycomb junction network, the innovative characteristics of this method is: based on existing cellular network framework, via node is set has the network code function, grouping information by base station feedback, via node is that the network code that directly adopts relaying forwarding or grouping back to carry out via node is transmitted to a plurality of user terminal judgements in the sub-district, divide time slot transmission data then, so that the base station obtains diversity gain, the user's communications quality of bad channel quality thereby raising cellular network cell edge customer promptly direct transfers, and the efficiency of transmission of relaying.The inventive method is compared with mode of direct transferring and traditional relaying pass-through mode respectively, because the present invention allows direct transfer in the sub-district user of the good user of channel quality and the bad channel quality that direct transfers be divided into one group and carry out the collaborative network coding transmission, not only effectively reduce the average interrupt probability of system, and improve the efficiency of transmission of relaying and the coverage of base station, also improved spectrum utilization efficiency.
In addition, in this method, the network code of the XOR mode that via node is taked digital information, just at two user's data in each grouping, the network code of via node and the decode procedure of base station all are simple to operate, are easy to realize.The present invention also is provided with the corresponding relay handover mechanism, to support user's mobility.Whole realization of Communication process can move and takes corresponding different transmission policy based on user's position, carries out real-time update and modification and perfection.
In a word, the inventive method operating procedure is simple, and is convenient, realizes easily, and popularizing application prospect is good.
Description of drawings
Fig. 1 is the schematic diagram (convenient for example, the different transmission situation of each relay services sub-district representative) that the user that is in different situations in honeycomb relaying sub-district takes different trunking methods transmission.
Fig. 2 be the present invention in the honeycomb junction network, the method that via node coding techniques Network Based carries out grouping cooperative communication to the multi-user is finished the flow diagram of uplink communication.
Fig. 3 is that the inventive method is carried out the relaying access channel model schematic diagram that information theory is analyzed in the relay services sub-district.
Fig. 4 is the information theory analytical model schematic diagram of the present invention two users of every group.
Fig. 5 is the comparison schematic diagram of the interruption performance and the signal to noise ratio of the inventive method embodiment result of the test.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, each via node of introducing in the honeycomb relaying sub-district uses network coding technique to carry out the communication system schematic diagram of wireless transmission.Six via node R1～R6 are provided with the network code function among the figure, and these via nodes are by the feedback information of base station BS, and the data that the control user sends are directly carried out the relaying forwarding, perhaps carry out the network code and the forwarding of via node with the form of grouping.Especially the situation that a plurality of users are inserted, in each relay services sub-district, the channel condition information (adopting different lines to represent among the figure) of the uplink channel estimation that base station BS carries out respectively according to base station and relaying is chosen different transmission meanss.This Fig. 1 also shows briefly and has described when customer location moves to adjacent relaying sub-district the Corresponding Countermeasures that the inventive method is taked.Specify it below in conjunction with Fig. 2.
Referring to Fig. 2, describe the performing step that the present invention is used for the network code block transmission method of wireless relay network in detail.At the cellular cell of uplink, this block transmission method has improved the coverage of relay transmission efficient and base station, and has reduced the average interrupt probability of system.Each concrete operations step is as follows:
Step 1, each via node of each conventional cellular cell (carry out the initialization setting as on six via node R1 among Fig. 1～R6), make it have the network code function, with the expansion relays node to the Signal Processing ability; Compare with traditional trunking scheme, reduce the hop count of relaying, improve throughput of system and reduce the average interrupt probability of whole system.
Step 2, via node carries out uplink channel estimation to the channel between user and the via node, and the base station is carried out uplink channel estimation respectively to the channel that direct transfers between channeling and trunking node and the base station between user and the base station.Comprehensive via node feedack in base station and existing information are carried out the judgement of transmission means to the user, and grouping feeds back to via node and user with the grouping information result at last then.
This step 2 comprises following content of operation:
(21) via node carries out uplink channel estimation to the channel between user and the via node and obtains channel condition information, and feeds back to the base station.The base station judges according to these information whether the user carries out the network code operation of via node: can be not less than the threshold value that via node is correctly decoded information if this user inserts the channel signal to noise ratio of via node, then this user adopts the transmission means that relaying inserts, and uses the network code grouping strategy that the user is carried out transmitted in packets.User U1, U2, U3 and U4 as the R1 Serving cell of Fig. 1; If the channel quality between user and the via node is very poor, when being not suitable for carrying out the transmitted in packets of junction network coding, then still adopt traditional relay transmission mode, as the user U5 of the R2 Serving cell of Fig. 1.
(22) base station is according to the channel condition information between user and the via node, and the user who needs is carried out the network code operation divides into groups.User U1, U2, U3 and U4 as the R1 Serving cell, they can be divided into two groups, so both guaranteed that the base station just can obtain initial data by simple XOR encoding operation, complexity of decoding can be too not high, simultaneously, also can reach the raising throughput of system of network coding technique, the purpose of reduction system break probability.Can be divided into for N user
Group will be if random packet will have
Plant point-score.According to the principle of the average interrupt probability minimum of system, optimum group technology is the user that the channel quality that direct transfers is best and direct transfers channel quality the poorest user is divided into one group, also is according to dividing into groups with quadrat method, till having divided to remaining users.
Referring to Fig. 3 and Fig. 4, suppose that number of users is even number (establishing N=2n), the prerequisite that network coding technique uses is that via node is wanted correct receiving subscriber data, just can encode, so the channel quality between user and the via node is to use a prerequisite of network coding technique well.So the user for judgement uses network code to transmit can think that the channel signal to noise ratio between these users and the via node is enough big, be channel desirable, that do not have interruption.
For example among Fig. 4, suppose that Ps represents outage probability,
Expression user i and user j are divided into one group of user's outage probability that uses the relaying forwarding transmission means of coding Network Based, and its subscript NC (NetworkCoding) represents network code, p
I, DAnd p
J, DRepresent the outage probability of user i respectively, p to base station and user j to two channels that direct transfer of base station
R, DThe expression via node is to the outage probability of base station.The outage probability of this transmitted in packets is so:
When N user, divide into groups according to following method: first user and N user are one group, and second user and N-1 user are one group, and just making j user and N+1-j user is one group, till having divided.Make Ps again
On averageRepresent the average interrupt probability of this system, then its computing formula is as follows:
In aforementioned calculation formula (1) substitution computing formula (2), carry out obtaining behind the abbreviation:
For all users' grouping scheme, in the computing formula (3) 3
p
R, D, (1-2p
R, D) equate that all different is multinomial
Size.The present invention seeks to make target function Ps
On averageMinimum just makes multinomial
Minimum.According to the ordering inequality as can be known: when N numerical value is divided into two groups, when each organized descending arrangement (or ascending arrangement), then the numerical value in these two groups was: inverted sequence and minimum, and with preface and maximum.So optimum packet mode is: according to the channel condition information that direct transfers, the signal to noise ratio of channel just direct transfers, arrange (or arranging) from high to low from low to high, with channel quality best with quality the poorest be divided into one group, for remaining user, again with channel quality time good and time difference be divided into one group, till having divided.
When number of users is odd number, i.e. N=2n+1.Be without loss of generality, the user is sorted from high to low according to the channel quality that direct transfers.Make the best user of channel quality that direct transfers be one group alone again and carry out relay transmission, a remaining 2n user carries out the network code transmitted in packets.This is to carry out outage probability after network code is transmitted because the best user of channel that direct transfers uses the transmission outage probability of traditional trunking scheme more to approach remaining users, after integrating, calculate the outage probability minimum of entire system, like this average interrupt probability minimum of system.Suppose user U1, the user that the channel that just direct transfers is best, the outage probability that uses traditional relaying pass-through mode to obtain is
Its subscript TR (Traditional Relay) represents traditional relaying pass-through mode.So when number of users in the system was odd number, system's average interrupt probability was:
Step 3, according to the grouping information of base station feedback, the user begins to send data according to group result; Via node then according to the result of judgement and grouping, carries out corresponding Data Stream Processing, sends coded data at last to the base station, and is decoded by the base station.This step 3 comprises following content of operation:
(31) user finds its pairing user according to the grouping information of base station feedback, divides time slot to send data to via node and base station then.In enough time slots, for the user who carries out network code grouping, when via node receives the data that two users of each group send, carry out chnnel coding earlier, carry out the network code operation then, again code signal is transmitted to the base station, up to the transmitted in packets of finishing all users.For example among Fig. 4, user Ui and Uj are one group, divide three time slots to finish transfer of data.
For the user of the R1 Serving cell among Fig. 1, if the state quality of the channel that direct transfers is as follows: U1＞U2＞U3＞U4, then user U1 and U4 are divided into one group of relay transmission of carrying out network code, and U2 and U3 are another groups, need intact all data of six slot transmission altogether; If satisfying the number of users that grouping requires is odd number, then control wherein the direct transfer best user's of channel quality information of the direct forwarding of via node; The user U8 in the R4 Serving cell for example, its prerequisite is that the subscriber channel state quality in this relay services sub-district is as follows: U8＞U9＞U10.If have only a user to satisfy the grouping requirement, just can only send with traditional trunking scheme; The U6 in the R3 Serving cell for example, its prerequisite is that user U7 in this relay services sub-district and the channel quality between the relaying do not satisfy the transmitted in packets requirement.
For the user who is not suitable for carrying out network code, then carry out traditional relay transmission alone, after promptly via node receives the data of this subscriber channel and carries out chnnel coding, directly be transmitted to the base station, up to the transmission of finishing all isolated users.For example, user U5 among the R2 of relay services sub-district and the U7 among the R3.
(32) base station is according to known user grouping information, and the decoding processing by network code obtains initial data, or directly receives these data, otherwise the base station should notify the user to broadcast its data again.
Step 4, adaptive control is carried out to all users that move in the base station: when the user leaves this relay services sub-district and moves to adjacent relaying sub-district, perhaps have new user to move to this relay services sub-district, this user's channel condition information is all upgraded in the base station, and then carries out the network code operation.
This step 4 comprises following content of operation.
(41) leave former relay services sub-district because move as the user, and when entering another via node overlay area, user U12 and the U13 among Fig. 1 for example, after the base station judges that user U12 is in the relaying switch area of relay services sub-district R6 and R5, the channel condition information of user U12 should be cancelled in the R6 Serving cell, and carry out channel estimating again at the R5 Serving cell, on its base station, carry out new grouping judgement then; The similar sequence of operations with user U12 should be carried out after judging that user U13 is in the relaying switch area of relay services sub-district R1 and R6 in same base station.
(42) enter this relay services sub-district as the user because move, then base station and relaying should carry out uplink channel estimation to this user again, obtain its new user channel and user channel condition information to via node that direct transfers.For example, user U12 in the R6 Serving cell enters into the R5 Serving cell, to carry out network code with user U11 and send data, certainly, if have in this zone more than three users, then user U12 will adjudicate earlier with these users and divide into groups, and utilizes the data after relaying divides time slot transmission network coding again.
(43) as the user because the state that moves in this relay services sub-district changes, via node and base station are carried out uplink channel estimation again, upgrade the channel condition information table of user in the base station, and the base station is adjudicated user's load mode again then, at last, the user carries out transfer of data.
The present invention has carried out repeatedly implementing test, Fig. 5 is exactly the relatively signal of the interruption performance and the signal to noise ratio of embodiment result of the test, as can see from Figure 5, along with the raising of signal to noise ratio, be the raising of channel quality, adopt the transmitted in packets mode that the present invention is based on network code obviously more superior than other two kinds of traditional approachs on the performance of average interrupt probability.Therefore, the result who implements test is successful, has realized goal of the invention.
Claims (9)
1. a coding techniques Network Based that is used for the honeycomb junction network is characterized in that the method that the multi-user carries out grouping cooperative communication: the multi-user is divided into groups, and solve the inefficient problem of relaying uplink in conjunction with network coding technique; And when the user was positioned at cell edge, this method can be improved its transmission performance, increased the coverage of base station in whole sub-district; Described method comprises following operating procedure:
(1) initialization is provided with the via node function: the via node of each cellular cell all is provided with the function of network code, makes via node use network coding technique that transmission signals is handled, with spread signal transmission range and raising throughput of system; In addition, via node keeps original coding and decoding function and the function of separating the mediation modulation to received signal;
(2) channel estimating and base station selected, judgement affiliate: via node carries out uplink channel estimation to the channel between user and the relaying, and the base station is carried out uplink channel estimation respectively to the channel that direct transfers between channeling and trunking node and the base station between user and the base station; After the base station obtains the channel condition information of via node feedback, judge whether the user carries out the network code operation of via node, comprehensive more original channel condition information, after the user grouping situation that needs are carried out the network code operation is adjudicated, last group result information is fed back to via node and user respectively;
(3) user carries out transmitted in packets: according to the grouping information of base station feedback, the user begins to send data according to group result, after via node receives the data that the user sends, the grouping information that provides according to the base station, the every group of user who carries out the network code operation adopted the network code operation, the user who does not carry out the network code operation is adopted traditional relaying strategy; Then, after via node is carried out corresponding Data Stream Processing, send coded data, and decode by the base station to the base station;
(4) the self adaptation centralized control is carried out in the base station: according to user's moving state, when the user leaves this relay services sub-district and moves to adjacent relay services sub-district, when perhaps new user moves to this relay services sub-district, the base station all dynamically updates all users' of this relay services sub-district channel condition information, return operation base station selected in the execution in step (2), the judgement affiliate again, realize the collaboration communication that network code divides into groups again.
2. method according to claim 1 is characterized in that: between described user and the via node, between user and the base station and the communication between via node and the base station all adopt time division way, distinguish with orthogonal resource.
3. method according to claim 1 is characterized in that: described network code operation is that the transmission network coded data was to obtain the network code gain after via node carried out the network code operation to the data of two user's transmissions in each grouping; The particular content of described network code operation is for superposeing or other simple linear operation by bit XOR, physics.
4. method according to claim 1 is characterized in that, described step (2) further comprises following content of operation:
(21) via node carries out uplink channel estimation to the channel between user and the relaying, obtain channel condition information after, feed back to the base station; The base station judges according to these channel condition informations whether the user adopts the network code division operation of via node: be not less than the threshold value that via node is correctly decoded if this user inserts the channel signal to noise ratio of relaying, then this user adopts the transmission means that relaying inserts, and uses the network code grouping strategy that the user is carried out transmitted in packets; Otherwise, adopt traditional relay transmission strategy;
(22) base station is carried out uplink channel estimation respectively to the channel between channeling and trunking and the base station of direct transferring between user and the base station and is obtained channel condition information, direct transfer to the base station estimated information of channel of the court verdict of comprehensive again relaying feedback and user, the user grouping of network code operation is carried out in the base station to needs, after finishing grouping, via node and user are given with the group result feedback information of judgement in the base station.
5. method according to claim 4 is characterized in that: in the described step (21), the base station judges that whether the user adopts the foundation of the network code division operation of via node is the threshold value whether channel status between user and the relaying satisfies default.
6. method according to claim 4, it is characterized in that: in the described step (22), it is to guarantee that the base station just can obtain initial data by simple decode operation that the purpose that the user of network code operation divides into groups is carried out to needs in the base station, promptly Xie Ma difficulty is too not complicated, just can improve throughput of system, reduce the system break probability; The grouping strategy of selecting for use is: divide into groups to the channel quality that direct transfers of base station according to the user.
7. method according to claim 6 is characterized in that: the described strategy that divides into groups to the channel quality that direct transfers of base station according to the user is that to make the average interrupt probability of system be minimum, just makes target function: the average interrupt probability
Obtain minimum value, in the formula,
When expression user j and another user N+1-j are divided into one group, use the outage probability of the relaying pass-through mode of coding Network Based; Its subscript natural number j is user's sequence number, and its maximum is n, and the total number of users order is N=2n, and subscript NC (Network Coding) represents network code; Therefore, to the optimum group technology of the channel quality grouping of direct transferring of base station be according to the user: the user that the channel quality that will direct transfer is best and direct transfer channel quality the poorest user is divided into a group, remaining continuation is according to this method grouping, till having divided; But when the number of users that satisfies the grouping requirement was odd number, then via node was directly transmitted the best user's data of channel status that direct transfers, and remaining user adopts above-mentioned grouping strategy to divide into groups.
8. method according to claim 1 is characterized in that, described step (3) further comprises following content of operation:
(31) user is according to the grouping information of base station feedback, finds its pairing user, and begins the branch time slot and send data to relaying and base station; In enough time slots, for the user who carries out network code grouping, after via node receives the data that every group of two users send, carry out the network code operation earlier, again coded data is carried out chnnel coding, then result data is transmitted to the base station, up to the transmission of finishing all grouping user; For the user who does not carry out network code, traditional relay transmission mode is then used in the base station, after promptly via node receives this user's data, only carries out chnnel coding, is transmitted to the base station then, up to the transmission of finishing these users;
(32) base station is according to known user grouping information, and the coded information stream behind the network code that receives is carried out the decoding processing of channel-decoding and network code, obtains the primary data information (pdi) of grouping user; To adopting traditional trunking scheme to send the user of data, channel-decoding is only carried out in the base station just can obtain initial data; If user data is not directly received, do not come out by base station decodes yet by the base station, then this user should broadcast its data again.
9. method according to claim 1 is characterized in that, described step (4) further comprises following content of operation:
(41) leave former relay services sub-district because move as the user, and when entering another via node overlay area, after the base station judges that this user has been in the relaying switch area, this subscriber channel state information should be cancelled in former relay services sub-district, in new relay services sub-district, reappraise this subscriber channel state information, carry out new network code grouping judgement in its base station and via node then; Or
(42) enter this relay services sub-district because move as new user, then base station and via node should carry out uplink channel estimation to this user again, obtain the channel condition information of channel between its new straight chain channel and user and the via node, just upgrade the channel condition information of this user, carry out the transmitted in packets of coding Network Based so that divide into groups again in the base station;
(43) in case take place to make the channel status of this relay services sub-district change because of the user moves, base station and via node all will carry out uplink channel estimation again, upgrade the channel condition information table of base station, re-execute the grouping judgement then, network coding technique is used in whole cellular cell to greatest extent.
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