CN102421068A - Grouping-based wireless communication - Google Patents
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- CN102421068A CN102421068A CN2010102953066A CN201010295306A CN102421068A CN 102421068 A CN102421068 A CN 102421068A CN 2010102953066 A CN2010102953066 A CN 2010102953066A CN 201010295306 A CN201010295306 A CN 201010295306A CN 102421068 A CN102421068 A CN 102421068A
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Abstract
The invention discloses a technical scheme for improving wireless communication network performance of a system by using interaction among user terminals. The technical scheme comprises the steps of: grouping a plurality of user terminals managed by a base station; and carrying out mutual cooperation on the plurality of user terminals in each group and communicating with the base station. According to the method and device provided by the invention, a data transmission link between a base station and the user terminals greatly enhances transmission reliability and effectively reduces data transmission energy loss of the user terminals through cooperative receiving or cooperative sending among the plurality of associated user terminals, thus transmission capacity of the whole wireless communication system is increased.
Description
Technical field
The present invention relates to cordless communication network, relate in particular to communicating by letter between user terminal and the base station in the cordless communication network.
Background technology
In the wireless cellular communication network, transfer of data generally is based on the network topology structure of point-to-multipoint (by the down direction of base station to user terminal) and how point-to-point (by the up direction of user terminal to base station) at present.Be in the Cellular Networks, no matter at up still down direction, user terminal only communicates with the base station, and generally is not carry out data interaction with collaborative between the user terminal.Passed through from initial first generation analogue system based on the Cellular Networks of this network topology structure; To the second generation and third generation system based on digital signal; And the present fourth-generation system of formulating, it is very perfect that the data transmission technology of cellular system and network mechanism have developed.But then, this means that also the current cellular communication system further improves and the space of breakthrough is more and more littler.
Summary of the invention
Cellular communication system is if will obtain further big lifting, only if on network topology structure, basic improves current network, and the present invention just is based on that this carries out.
Say that statistically in the cellular communications networks, most user terminal is in idle condition.In fact, these user terminals that are in idle condition can be used for cellular network is effectively strengthened.Basic thought of the present invention is based on the characteristic that most of user terminal in the cellular communications networks is in idle condition; Utilize at a distance of the direct communication (without the base station) between the nearer user terminal; Through the collaborative reception (as far as descending) or collaborative the transmission (as far as up) of a plurality of user terminals, come effectively to strengthen the transmission performance of cellular communication system.
According to a specific embodiment of the present invention, a kind of method that user terminal and base station communicate that in cordless communication network, is used for is provided, may further comprise the steps: a plurality of user terminals that said base station is had jurisdiction over divide into groups; And a plurality of user terminals in said each grouping are cooperated each other and said base station communicates.
Alternatively, in one embodiment, said a plurality of user terminals are divided into groups according to the channel space characteristic and the channel large scale channel fading characteristic of said user terminal.
Alternatively, in one embodiment, in the downlink transfer of said base station to target terminal user, each user terminal in dividing into groups under this target terminal user all receives the downlink data packet that said base station sends to said target terminal user; Receive said downlink data packet like said target terminal user mistake, then this target terminal user is sent wrong indication information at least one other user terminal in dividing into groups under it that receives; Whether said at least one other user terminal checking correctly receives said downlink data packet, and like correct reception, then the downlink data packet with said correct reception is sent to said target terminal user.
Alternatively, in one embodiment, in the uplink of target terminal user to said base station, this target terminal user is sent uplink and is assisted at least one other user terminal in request message to its said grouping; Said target terminal user receives the response message from the response described request message of other user terminal, and upstream data bag waiting for transmission is sent to the user terminal that sends said response message; The user terminal of said at least transmission response message sends said upstream data bag to said base station.
According to another specific embodiment of the present invention; A kind of method that a plurality of user terminals that the base station is had jurisdiction over are divided into groups of in cordless communication network, being used for is provided, and may further comprise the steps: channel space characteristic and channel large scale fading characteristic according to said a plurality of user terminals are divided into groups to said a plurality of user terminals.
According to another specific embodiment of the present invention; A kind of device that a plurality of user terminals that the base station is had jurisdiction over are divided into groups of in cordless communication network, being used for is provided; Comprise: apparatus for grouping is used for according to the channel space characteristic and the channel large scale fading characteristic of said a plurality of user terminals said a plurality of user terminals being divided into groups.
According to another specific embodiment of the present invention; A kind of device of communicating with the base station of in the user terminal of cordless communication network, being used for is provided; Comprise: cooperation device; Be used for cooperating each other with a plurality of other user terminals and said base station communicates, wherein, this user terminal and a plurality of other user terminal belong to same grouping.
Through method and apparatus of the present invention; The base station will be through collaborative reception between a plurality of user terminals that are associated or collaborative transmission with the data transmission link between the user terminal; Strengthen transmission reliability greatly; Effectively reduce the transfer of data energy loss of user terminal, thereby improved the transmission capacity of entire wireless communication system.
Description of drawings
Through reading the following detailed description of non-limiting example being done with reference to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.
Fig. 1 is the application scenarios sketch map according to an embodiment of the present invention;
Fig. 2 is the flow chart that in communication network, is used for the method that user terminal and base station communicate according to an embodiment of the invention;
Fig. 3 is for carrying out the flow chart of downlink communication according to cooperating each other between the user terminal of an embodiment of the present invention with base station 11;
Fig. 4 is for carrying out the flow chart of uplink communication according to cooperating each other between the user terminal of an embodiment of the present invention with base station 11;
Fig. 5 (a) and (b) with (c) be sketch map according to the up joint transmission of embodiment of the present invention;
Fig. 6 is for being used for device 600 that a plurality of user terminals that the base station is had jurisdiction over are divided into groups according to an embodiment of the present invention in cordless communication network;
Fig. 7 is the structured flowchart according to the device 700 that in the user terminal of cordless communication network, is used for communicating with the base station of an embodiment of the present invention;
Wherein, same or analogous Reference numeral is represented same or analogous steps characteristic or device (module).
Embodiment
Below in conjunction with accompanying drawing specific embodiment of the present invention is elaborated.
Fig. 1 shows the application scenarios sketch map according to an embodiment of the present invention.In Fig. 1, have a base station 11 and a plurality of user terminals 121,122,123,124,125,126,127,128,129.
Fig. 2 shows the flow chart that in communication network, is used for the method that user terminal and base station communicate according to an embodiment of the invention.Following according to application scenarios shown in Figure 1, the flow process among Fig. 2 is elaborated.
At first, in step S201, a plurality of user terminals that said base station is had jurisdiction over divide into groups.
Then, in step S202, a plurality of user terminals in said each grouping are cooperated each other and said base station communicates.
Below be example with application scenarios shown in Figure 1, to how to divide into groups and how each other collaboration communication illustrate respectively.
In one embodiment, according to the channel space characteristic and the channel large scale fading characteristic of user terminal said a plurality of user terminals are divided into groups.Those of ordinary skill in the art will be understood that this grouping can be complete by base station 11, also can be next complete by arbitrary user terminal, or other network equipment comes complete.
The channel space characteristic of user terminal is meant the spatial character of the channel between base station 11 to the user terminal, particularly, refers to the position distribution characteristic spatially of this user terminal multi-antenna array of 11 in the base station.
A specific embodiment that in the face of how divides into groups according to channel space characteristic and channel large scale fading characteristic down is elaborated.The channel here can be that up channel also can be a down channel.Usually the up-downgoing channel has stronger correlation; Can shared identical group protocol in the uplink and downlink communication; Also be that uplink and downlink communication can all divide into groups according to down channel spatial character and down channel large scale fading characteristic, perhaps uplink and downlink communication can all divide into groups according to up channel spatial character and up channel large scale fading characteristic.The ground that is without loss of generality among each embodiment of the present invention, is that example describes with the down channel.
At first, each user terminal can estimate down channel transmission matrix Hi according to the public guide frequency of down channel, i=1, and 2 ... K, K are the number of user terminal.In application scenarios shown in Figure 1, K=9.When then long or the covariance matrix of broadband:
R
i＝E{H
i HH
i}，i＝1，2，…，K (1)
The desired value of Ri representative is represented the assembly average of the covariance matrix of channel at a plurality of subchannels of frequency domain or a plurality of time slots of time domain.
Then,, in given predetermined code book, select the basic eigenvector with the corresponding eigenvalue of maximum of covariance matrix for each user terminal i, also promptly:
Wherein, vi representes channel covariance matrices R
i=E{H
i HH
iThe basic eigenvector of corresponding eigenvalue of maximum, C is the predetermined code book that contains a plurality of code words, subscript H representes conjugate transpose.It should be noted that; Predefined here code book C can be different from the precoding codebook that is used for the downstream data channel precoding; The number of code word is corresponding with the number of the distinguishable spatial domain in base station among the code book C; Usually, under the situation of the linear antenna arrays of the base station of arranging with the distance of half wavelength, the code word number of code book C is identical with the number of transmit antenna.Code book C is the set that is made up of limited a plurality of code word, and wherein each code word is the corresponding number of transmit antennas of confirming according to certain rule and the matrix or the vector of data fluxion.For example: based on DFT code book (list of references [1] B.M.Hochwald, T.L.Marzetta, the T.J.Richardson of fourier transform matrix; Et al, " Systematic Design of UnitarySpace-Time Constellations, " IEEE Trans.on information theory; Vol.46, No.6, Sep 2000. [2] Du Yang; Lie-Liang Yang and Lajos Hanzo, " DFT-based Beamforming Weight-Vector Codebook Design for SpatiallyCorrelated Channels in the Unitary Precoding Aided MultiuserDownlink, " IEEE ICC 2010.); Grassmannian code book (list of references [3] D.J.Love, R.W.Health, ThomasStrohmer based on the uniform quantization complex vector space; " Grassmannian Beamforming for Multiple-InputMultiple-Output Wireless Systems; " IEEE Transactions on InformationTheory, vol.49, no.10;, Oct.2003).
Secondly, user terminal i estimates its mean receiving power, and from the scalar code book that quantizes mean receiving power, selects a scalar code word the most close with estimated value:
Wherein, The mean receiving power of
expression user terminal i, P representes to quantize the scalar code book of mean receiving power.
The subscript of the vector code word among the code book C that user terminal i is corresponding like this and the subscript of the scalar code word among the code book P have just been confirmed.In view of the above; User terminal is divided into many groups; User terminal with identical vector code word and same scalar code word is divided into one group, and also promptly, the user terminal that has identical or akin channel space characteristic and have an identical or akin channel large scale fading characteristic is divided into one group:
S
p，q＝{u
i|c
i＝c
p，p
i＝p
q，i∈{1，2，…，K}} (4)
Wherein,
C is the predetermined code book that contains a plurality of code words, and subscript H representes conjugate transpose, v
iExpression channel covariance matrices R
i=E{H
i HH
iThe basic eigenvector of corresponding eigenvalue of maximum, i=1,2 ..., K is the sign of user terminal,
The mean receiving power of expression user terminal i, P representes to quantize the scalar code book of mean receiving power.
Those of ordinary skill in the art will be understood that this grouping can be complete by base station 11, also can be next complete by arbitrary user terminal, or other network equipment comes complete.
Those of ordinary skill in the art will be understood that; Only be an example above-mentioned user terminal the grouping according to formula (4); Alternatively; Can also be according to formula (4), the subscript of the vector code word among the code book C that user terminal i is corresponding and the subscript of the scalar code word among the code book P are identical and to differ be that 1 user terminal is divided into one group.
It is above-mentioned that to come user terminal is divided into groups according to channel space characteristic and channel large scale fading characteristic only be an example; Alternatively; Can also come user terminal is divided into groups according to other standards; For example, divide into groups according to the residing geographical position of user terminal, the user terminal that the geographical position is close is divided into one group.
The ground that is without loss of generality is example with application scenarios shown in Figure 1, establishes user terminal 121,122,123 and 124 and is divided into one group, and user terminal 125,126 and 127 is divided into one group, and user terminal 128 and 129 is divided into one group.Mutual cooperation communicates with base station 11 between the user terminal during then each divides into groups.
Be not prevailingly, with user terminal 121,122,123 and 124 places be grouped into example, to how cooperating between the user terminal in dividing into groups the process that communicates with base station 11 is elaborated.Usually communicating by letter between user terminal and the base station 11 comprises two aspects: downlink transfer and uplink, the first mutual cooperating process to downlink transfer of hereinafter is elaborated.
In the downlink transfer of the 11 pairs of target terminal user in base station, each user terminal in dividing into groups under this target terminal user all receives the downlink data packet that base station 11 sends to target terminal user; Receive this downlink data packet like the target terminal user mistake, then this target terminal user is sent wrong indication information at least one other user terminal in dividing into groups under it that receives; Whether this at least one other user terminal checking correctly receives said downlink data packet, like correct reception, then will be somebody's turn to do the correct downlink data packet that receives and be sent to target terminal user.
Fig. 3 shows according to cooperating each other between the user terminal of an embodiment of the present invention and carries out the flow chart of downlink communication with base station 11.
Ground is without loss of generality; With user terminal 121 is that target terminal user is an example; With reference to Fig. 1 downlink transmission process shown in Figure 3 is described in detail, for the ease of describing, with the grouping called after G1 under user terminal 121,122,123 and 124; With the grouping called after G2 under user terminal 125,126 and 127, with the grouping called after G3 under user terminal 128 and 129.
At first; In step S301; Before downlink data packet transmission, the scheduling of resource of this data packet transmission is carried out in base station 11, and with the sign of scheduled resources information and target terminal user 121; With and the Downlink Control Information such as sign of said grouping broadcast together, and on this scheduled resources, send this packet.Need to prove that the concrete form of the sign of the user terminal in the Downlink Control Information and the sign of grouping is not limit, for example can be the User_ID with 8 bit identification, and Group_ID etc.
In step S302, each user terminal receives Downlink Control Information, and confirm under self group character whether with Downlink Control Information in group character consistent.If consistent, then in step S303, on corresponding resource, receive data packets for transmission.Also promptly, can on corresponding resource, receive data packets for transmission for the user terminal that belongs to a grouping together with target terminal user 121; For not belonging to the user terminal of same grouping, then abandon downlink information with target terminal user 121.For application scenarios shown in Figure 1,, also can receive this packet at the user terminal 122,123 and 124 of same grouping with target terminal user 121 except target terminal user 121 receives this packet.
Then, in step S304, the user terminal 121,122,123 and 124 during the G1 that receives this packet divides into groups confirms whether the user terminal identification in the Downlink Control Information is consistent with the user terminal identification of self.If consistent with the user terminal identification of self, also promptly this user terminal is a target terminal user 121, and then user terminal 121 is decoded to the packet that receives at step S305.
Correct like user terminal 121 decodings; Then in step S306; User terminal 121 sends indication and receives other user terminal and base station 11 in correct Indication message to the grouping; Other user terminal 122,123 and 124 discharges this packet, the then end of transmission of this packet in step S307 after receiving this Indication message.
Like user terminal 121 decoding errors; Then the transmission indication receives other user terminal in wrong Indication message to the grouping in step S308; Other user terminal is after receiving this Indication message; The packet that in step S309, the front is received is decoded, as the success of decoding, and then in step S310, this proper data bag is sent to target terminal user 121.Incorrect if decode, then in step S311, discharge this packet.
As in step S312, target terminal user 121 receives from correct behind the decoded packet data of other user terminal, then in step S313, sends correct Indication message to the base station 11 that receives of designation data bag.Receive from the packet of other user terminal decoding error or do not receive packet in the given time still like user terminal 121, then in step S313, send Indication message to the base station 11 that designation data bag mistake receives from other user terminal.
Need to prove that flow process shown in Figure 3 only is an example.Can also produce a lot of variations on this basis.For example; Receive the situation of packet error in target terminal user 121; And other user terminal receives under the correct situation of packet; After other user terminal sends to target terminal user 121 with the proper data bag, still receive mistake like target terminal user 121, then other user terminal can also carry out the re-transmission of this packet.
Another one need explain in a grouping, except that target terminal user 121, can only have one or two user terminals and target terminal user 121 to cooperate in other a plurality of user terminals, to accomplish the transmission of downlink data packet.
More than the mutual cooperating process of downlink transfer is specified, hereinafter is elaborated to the mutual cooperating process of uplink.
In the uplink of target terminal user to said base station, this target terminal user is sent uplink and is assisted request message at least one other user terminal in dividing into groups under it; Target terminal user receives the response message from the response request message of other user terminal; And upstream data bag waiting for transmission is sent to the user terminal that sends response message, the user terminal of this transmission response message sends said upstream data bag to the base station at least.Alternatively, target terminal user is united transmission upstream data bag to said base station with the user terminal that sends response message.
Fig. 4 shows according to cooperating each other between the user terminal of an embodiment of the present invention and carries out the flow chart of uplink communication with base station 11.
The ground that is without loss of generality is that target terminal user is an example with user terminal 121 still, with reference to Fig. 1 uplink process shown in Figure 4 is described in detail.
At first, in step S401, target terminal user 121 confirms whether its uplink needs the cooperation of other user terminal in its affiliated grouping.For example; Maybe be because the channel condition between base station 11 and the target terminal user 121 be relatively poor; For example be positioned at the large scale channel fading of cell edge or experience; The perhaps situations such as power shortage of target terminal user 121, target terminal user 121 needs other user terminal therewith to cooperate with the transmit ascending data bag.
Do not need other user terminal and its cooperation like target terminal user 121, then in step S402, carry out traditional uplink.
Need other user terminal and its cooperation like target terminal user 121, then in step S403, send uplink and assist request message other user terminal in dividing into groups under to it.Target terminal user 121 can only be sent to other user terminal with this request message, also can send a plurality of other user terminals.In one embodiment, the selection of this other user terminal can be decided according to the up channel situation between other user terminal to the base station.
In one embodiment, whether other user terminal participates in the transmission with the upstream data bag of target terminal user 121, can be decided up channel situation for example, the busy extent of self etc. by the situation of this other user terminal according to self.
Usually; A user terminal in the user grouping is given with certain section time-frequency resource allocating in 11 of base stations; So in general on certain running time-frequency resource, receive or when sending packet when a user terminal, it is always idle at this moment that this user belongs to other user terminal in the user grouping.
Other user terminal then responds the request message of target terminal user 121 like the transmission of participation with the upstream data bag of target terminal user 121, sends response message a to target terminal user 121.In step S404; Target terminal user 121 determines whether to receive the response message from other user terminal; As do not receive; Then in step S402, carry out traditional uplink, otherwise follow in step S405, target terminal user 121 is sent upstream data bag waiting for transmission to the user terminal that sends response message.In one embodiment, target terminal user 121 also can select the certain customers terminal to cooperate from those other user terminals that send response message, and therefore, upstream data bag waiting for transmission only need send to those selecteed user terminals and get final product.
In step S406, other user terminal that sends response message at least sends said upstream data bag to the base station 11.In one embodiment, target terminal user 121 and other user terminal that sends response message are united and are sent the upstream data bag to the base station 11.Other user terminal can know which video resource this upstream data wraps in and send from the ascending control information of base station 11 broadcasting.
In one embodiment, target terminal user 121 also can select the certain customers terminal to cooperate from those other user terminals that send response message, and therefore, upstream data bag waiting for transmission only need send to those selecteed user terminals and get final product.At least those selecteed other user terminals send upstream data bag waiting for transmission to the base station 11.Alternatively, in one embodiment, target terminal user 121 and selecteed other user terminal are united and are sent the upstream data bag to the base station 11.
Perhaps target terminal user 121 is united transmission upstream data bag waiting for transmission to the situation of base station 11 with other user terminal in upstream data bag to the base station 11 that a plurality of other user terminals transmission band transmission are arranged, and send mode has following three kinds at least.
First kind of mode is re-transmitted: a plurality of user terminals send same packet to base station 11 on identical running time-frequency resource, shown in Fig. 5 (a).
The second way is a branch collection coding transmission: carry out a plurality of user terminals that send and carry out combined coding acquisition space diversity to increase the reliability of uplink.A classical example of space diversity coding is the Alamouti coding.In the Alamouti encoding scheme, based on the unique information of user terminal, ID etc. for example, a plurality of user terminals are divided into two groups.Each group is sent two groups of data in the Alamouti coding respectively, shown in Fig. 5 (b).more situations in detail about minute collection coding transmission; For example can be with reference to [2] Alamouti S.M.; " A simpletransmit diversity technique for wireless communications; " IEEE Journalon Selected Areas in Communications, Volume:16, Issue:8.
The third mode is the multiplexing and encoding transmission: carry out a plurality of user terminals that send and carry out combined coding to obtain the spatial reuse gain to improve throughput of uplink transmission.In this encoding scheme, be R like the data fluxion of base station 11 indication, then based on the unique information of user terminal, ID etc. for example, a plurality of user terminals are divided into R son and organize.The defeated corresponding data symbol of each sub-component supplementary biography flow to base station 11.Shown in Fig. 5 (c).more situations in detail about the multiplexing and encoding transmission; For example can be with reference to [3] Wolniansky P.W.; Foschini G.J., Golden G.D., Valenzuela R.A.; " V-BLA ST:an architecture for realizingvery high data rates over the rich-scattering wireless channel, " ISSE1998.
Need to prove that the communication between the user terminal can for example bluetooth, zigbee, UWB, wave point such as infrared carry out through some.
Fig. 6 show according to an embodiment of the present invention in cordless communication network, be used for device 600 that a plurality of user terminals that the base station is had jurisdiction over are divided into groups, this device 600 comprises an apparatus for grouping 601.
Be elaborated to installing 600 the course of work below in conjunction with application scenarios shown in Figure 1.
Apparatus for grouping 601 divides into groups to a plurality of user terminals according to the channel space characteristic and the channel large scale fading characteristic of a plurality of user terminals.Alternatively, in one embodiment, apparatus for grouping 601 can divide into groups to user terminal according to formula (4).
Those of ordinary skill in the art will be understood that this device 600 can be arranged in base station 11, also can be arranged in arbitrary user terminal, or be arranged in other network equipment.
Those of ordinary skill in the art will be understood that; It only is an example that apparatus for grouping 601 divides into groups to user terminal according to formula (4); Alternatively; Can also be according to formula (4), the subscript of the vector code word among the code book C that user terminal i is corresponding and the subscript of the scalar code word among the code book P are identical and to differ be that 1 user terminal is divided into one group.
Fig. 7 shows the structured flowchart according to the device 700 that in the user terminal of cordless communication network, is used for communicating with the base station of an embodiment of the present invention.Device 700 comprises a cooperation device 710.
Be elaborated to installing 700 the course of work below in conjunction with application scenarios shown in Figure 1.The ground that is without loss of generality, to be arranged in user terminal 121 be example to install 700, is elaborated to installing 700 processes of communicating by letter with base station 11 with reference to Fig. 1.
At first, a plurality of other user terminals among the grouping G 1 are cooperated and base station 11 communicates each other under cooperation device 710 and the user terminal 121.
Particularly, in the downlink communication process, the downlink data packet that sends to this user terminal 121 that first receiving device 701 receives from base station 11.Then whether demo plant 702 these downlink data packet of checking are correct.Like this downlink data packet mistake, then first dispensing device 703 sends wrong indication informations other user terminal to the G1 that divides into groups that receives.Other user terminal is decoded to the packet that the front receives after receiving this Indication message, as the success of decoding, and then this proper data bag is sent to target terminal user 121.Second receiving system 704 receives the downlink data packet from other user terminal; 702 pairs of these packets of demo plant are decoded then; As correctly, then one the 3rd dispensing device (not shown among Fig. 7) sends correct Indication message to the base station 11 that receives of designation data bag.Receive from the packet of other user terminal decoding error or do not receive the packet from other user terminal in the given time still like user terminal 121, then the 3rd dispensing device sends Indication message to the base station 11 that designation data bag mistake receives.
In the uplink communication process, second dispensing device 705 sends uplink and assists request messages at least one other user terminal among grouping G2 under it.Then, 706 receptions of the 3rd receiving system are from the response message of this request message of response of other user terminal.Then, second dispensing device 705 is sent to upstream data bag waiting for transmission the user terminal that sends said response message.The 3rd dispensing device 707 and the user terminal of said transmission response message are united and are sent said upstream data bag to the base station 11.In one embodiment, other user terminal that only sends response message sends this upstream data bag to base station 11.
More than the course of work of the device in the target terminal user 121 700 is specified, below the course of work of the device 700 that is arranged in non-target terminal user 122 or other user terminal is described in detail.
At first, first receiving device 701 receptions are from the downlink data packet that sends to other user terminal among the grouping G 1 of base station 11.Then, second receiving system 704 receive from the indication of other user terminal that they are received from the whether correct Indication message of the downlink data packet of base station 11.The mistake that receives from other user terminal like second receiving system 704 receives Indication message, and then whether demo plant 702 these user terminals of checking correctly receive the packet that said other user terminal mistake receives.Like the correct packet that said other user terminal mistake receives, then said this packet that correctly receives to said other user terminal of first dispensing device, 703 transmissions of receiving of this user terminal.
For the upstream data bag transmission of other user terminal among the affiliated grouping G1, second receiving system 704 receives from the uplink of other user terminal assists request message.Then, confirm that device (not shown in Fig. 7) determines whether to respond this request message.If respond this request message, then first dispensing device 703 sends response message to described other user terminal of this request message of response.Then, 704 receptions of second receiving system are from the upstream data bag waiting for transmission of this other user terminal.At last, the 3rd dispensing device 707 can be united transmission with other user terminal with this upstream data bag to base station 11, or sends separately.
Below technique effect of the present invention is described.
The ground that is without loss of generality, the transmission of establishing between the user terminal does not make mistakes, and establishing the Block Error Rate that transmits between base station and the user terminal is P
Bler, 1, then under co-operating situation between the user terminal of the present invention, Block Error Rate P
Bler, 2For:
Wherein, Swg is the number at users in collaboration terminal.This shows that through using method and apparatus of the present invention, Block Error Rate has reduced widely.Some example values have been listed in the form 1.
Form 1: Block Error Rate example value
Any technical scheme that does not deviate from spirit of the present invention all should fall within protection scope of the present invention.In addition, should any Reference numeral in the claim be regarded as limit related claim; " comprise " that a speech do not get rid of device unlisted in other claim or the specification or step; " one " before the device does not get rid of the existence of a plurality of such devices; In comprising the equipment of multiple arrangement, the one or more function in this multiple arrangement can be realized by same hardware or software module; Words such as " first ", " second ", " the 3rd " only are used for representing title, and do not represent any specific order.
More than specific embodiment of the present invention is described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the appended claims.
Claims (15)
1. one kind is used for the method that user terminal and base station communicate in cordless communication network, may further comprise the steps:
A. a plurality of user terminals of said base station being had jurisdiction over divide into groups;
B. a plurality of user terminals in said each grouping are cooperated each other and said base station communicates.
2. method according to claim 1, wherein, said steps A may further comprise the steps:
A1. according to the channel space characteristic and the channel large scale channel fading characteristic of said user terminal said a plurality of user terminals are divided into groups.
3. method according to claim 2, wherein, said steps A 1 may further comprise the steps:
According to following formula said a plurality of user terminals are divided into groups:
S
P, q={ u
i| c
i=c
p, p
i=p
q, i ∈ 1,2 ..., K}}, wherein,
C is the predetermined code book that contains a plurality of code words, and subscript H representes conjugate transpose, v
iExpression channel covariance matrices R
i=E{H
i HH
iThe basic eigenvector of corresponding eigenvalue of maximum, i=1,2 ..., K is the sign of user terminal,
The mean receiving power of expression user terminal i, P representes to quantize the scalar code book of mean receiving power.
4. method according to claim 1, wherein, said step B may further comprise the steps:
In the downlink transfer of said base station to target terminal user, each user terminal in dividing into groups under this target terminal user all receives the downlink data packet that said base station sends to said target terminal user;
Receive said downlink data packet like said target terminal user mistake, then this target terminal user is sent wrong indication information at least one other user terminal in dividing into groups under it that receives;
Whether said at least one other user terminal checking correctly receives said downlink data packet, and like correct reception, then the downlink data packet with said correct reception is sent to said target terminal user.
5. method according to claim 1, wherein, said step B may further comprise the steps:
B21. in the uplink of target terminal user to said base station, this target terminal user is sent uplink and is assisted request message at least one other user terminal in dividing into groups under it;
B22. said target terminal user receives the response message from the response described request message of other user terminal, and upstream data bag waiting for transmission is sent to the user terminal that sends said response message;
B23. the user terminal of said at least transmission response message sends said upstream data bag to said base station.
6. method according to claim 5, wherein said step B23 may further comprise the steps:
The user terminal of-said target terminal user and said transmission response message is united the said upstream data bag of transmission to said base station.
7. one kind is used for method that a plurality of user terminals that the base station is had jurisdiction over are divided into groups in cordless communication network, may further comprise the steps:
-according to the channel space characteristic and the channel large scale fading characteristic of said a plurality of user terminals said a plurality of user terminals are divided into groups.
8. method according to claim 7, wherein, said grouping step may further comprise the steps:
According to following formula said a plurality of user terminals are divided into groups:
S
P, q={ u
i| c
i=c
p, p
i=p
q, i ∈ 1,2 ..., K}}, wherein,
C is the code book that contains a plurality of code words, and subscript H representes conjugate transpose, v
iExpression channel covariance matrices R
i=E{H
i HH
iThe basic eigenvector of corresponding eigenvalue of maximum, i=1,2 ..., K is the sign of user terminal,
The mean receiving power of expression user terminal i, P representes to quantize the scalar code book of mean receiving power.
9. one kind is used for device that a plurality of user terminals that the base station is had jurisdiction over are divided into groups in cordless communication network, comprising:
Apparatus for grouping is used for according to the channel space characteristic and the channel large scale fading characteristic of said a plurality of user terminals said a plurality of user terminals being divided into groups.
10. device according to claim 9, wherein, said apparatus for grouping is used for:
According to following formula said a plurality of user terminals are divided into groups:
S
P, q={ u
i| c
i=c
p, p
i=p
q, i ∈ 1,2 ..., K}}, wherein,
C is the code book that contains a plurality of code words, and subscript H representes conjugate transpose, v
iExpression channel covariance matrices R
i=E{H
i HH
iThe basic eigenvector of corresponding eigenvalue of maximum, i=1,2 ..., K is the sign of user terminal,
The mean receiving power of expression user terminal i, P representes to quantize the scalar code book of mean receiving power.
11. one kind is used for the device that communicates with the base station, comprises in the user terminal of cordless communication network:
Cooperation device is used for cooperating each other with a plurality of other user terminals and said base station communicates, and wherein, this user terminal and a plurality of other user terminal belong to same grouping.
12. device according to claim 11, wherein, said cooperation device comprises:
First receiving device is used to receive the downlink data packet that sends to this user terminal from said base station;
Demo plant is used to verify whether this downlink data packet is correct;
First dispensing device like said downlink data packet mistake, sends wrong other user terminal that receives in indication information to the said grouping;
Second receiving system is used for receiving the downlink data packet from other user terminal of said grouping.
13. device according to claim 12, wherein, said first receiving device also is used for:
Reception is from the downlink data packet of other user terminal in the said grouping of sending to of said base station;
Said second receiving system also is used for:
Whether correct they are received from the indication of other user terminal in reception from the downlink data packet of said base station Indication message;
The mistake that receives from other user terminal like said second receiving system receives Indication message, and then said demo plant also is used for:
Verify whether this user terminal correctly receives the packet that said other user terminal mistake receives;
Like the correct packet that receives said other user terminal mistake reception of this user terminal, then said first dispensing device also is used for:
Send this correct packet that receives to said other user terminal.
14. according to 11 described devices, wherein, said cooperation device comprises:
Second dispensing device is used for sending at least one other user terminal that uplink assists request message to divide into groups under it;
The 3rd receiving system is used to receive the response message from the response described request message of other user terminal;
Said second dispensing device also is used for:
Upstream data bag waiting for transmission is sent to the user terminal that sends said response message.
15. device according to claim 14, wherein, said cooperation device also comprises:
The 3rd dispensing device is used for uniting the said upstream data bag of transmission to said base station with the user terminal of said transmission response message.
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