CN104754756B

CN104754756B - A kind of method and apparatus for being used to carry out collaboration multi-point joint transmission in the base station of LTE-A network

Info

Publication number: CN104754756B
Application number: CN201310753975.7A
Authority: CN
Inventors: 赵松峄; 张碧军
Original assignee: Nokia Shanghai Bell Co Ltd
Current assignee: Nokia Shanghai Bell Co Ltd
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2018-05-25
Anticipated expiration: 2033-12-31
Also published as: CN104754756A

Abstract

The present invention provides a kind of method and apparatus for being used to carry out collaboration multi-point joint transmission in the base station of LTE A networks.Wherein, this method comprises the following steps：Obtain the channel information of each downlink；According to the channel information of each downlink, the label of each downlink is generated, the label includes the degree of correlation information between the precoding vector of the downlink and the code book and the highest precoding vector of the degree of correlation between the downlink comprising the code book；When cooperateing with multi-point joint transmission, according to the label of each downlink, to dispatch each downlink.Compared with prior art, present invention reduces the system implementation complexity of collaboration multi-point joint transmission, acceptable system performance and the service quality of Cell Edge User is realized, improves cell edge throughput.

Description

A kind of side for being used to carry out collaboration multi-point joint transmission in the base station of LTE-A network Method and equipment

Technical field

The present invention relates to LTE wireless communication fields more particularly to it is a kind of in the base station of LTE-A network for being assisted With the method and apparatus of multi-point joint transmission.

Background technology

Since LTE system is generally using identical networking, Cell Edge User is easily disturbed be subject to adjacent cell, so as to lead Cause the poor-performing of Cell Edge User.In LTE-A, collaboration multiple spot technology can be used to pass through dynamic between multiple cells State cooperates to improve the service quality of Cell Edge User, improves cell edge throughput.Wherein, passed in collaboration multi-point joint In defeated, multiple cells of cooperation transmit data to Cell Edge User simultaneously using identical running time-frequency resource, so as to by other The interference signal of cell is converted into the useful signal of this community user, by the SINR for promoting user（Signal Interference and Noise Ratio, Signal Interference Noise Ratio）To ensure demodulation performance.For the central user of cell, due to having had There is preferable SINR, it can be no longer using collaboration multiple spot technology.When multi-point joint transmission technology is cooperateed with to be used for downlink, The user of collaboration multi-point joint transmission how is selected, how to select collaboration base station, collaboration base station how is avoided in scheduling of resource The co-channel interference of interior user simultaneously carries out the interference coordination between collaboration base station and how to reduce the reality of collaboration multi-point joint transmission Existing complexity is problem to be solved.

In the existing scheme to solve the above problems, in general, in TDD-LTE system, according to channel reciprocity, eNodeB Physical layer channel estimation is carried out according to the detectable signal received from user equipment, so as to draw corresponding downlink The information such as channel matrix.In FDD-LTE systems, user equipment sends such as PMI to eNodeB（Pre-coding matrix instruction）, RI（Order instruction）Wait channel informations.It afterwards, can be according to channel informations such as such as channel matrixes come to need in the MAC layer of eNodeB The user equipment for carrying out collaboration multi-point joint transmission is scheduled and interference coordination.Then, the serving cell of the user's equipment ENodeB joint precoding is carried out to signal, and the signal after joint precoding is synchronized to each cooperation district and is combined Transmission.Due to needing between the physical layer and MAC layer of eNodeB, and need to carry out between multiple cooperation districts various Information exchange, the existing scheme implementation complexity height for supporting collaboration multi-point joint transmission.Therefore, it is necessary to seek a kind of new For carry out collaboration multi-point joint transmission scheme, with relatively low implementation complexity, with acceptable system performance kimonos Business quality completes collaboration multi-point joint transmission, improves the service quality of Cell Edge User, improves cell edge throughput.

The content of the invention

The object of the present invention is to provide one kind in LTE-A network, for carry out collaboration multi-point joint transmission method and Device.

According to an aspect of the present invention, disclose it is a kind of in the base station of LTE-A network for carry out collaboration multiple spot connection The method for closing transmission, wherein each base station in the LTE-A network include identical predetermined code book, and this method comprises the following steps：

The channel information of each downlink of-acquisition；

- according to the channel information of each downlink, the label of each downlink is generated, the label includes Degree of correlation information between the precoding vector of the downlink and the code book simultaneously includes the code book and the downlink chain The highest precoding vector of the degree of correlation between road；

- when cooperateing with multi-point joint transmission, according to the label of each downlink, to dispatch each downlink Link.

According to another aspect of the present invention, provide it is a kind of in the base station of LTE-A network for carry out collaboration multiple spot connection The device of transmission is closed, wherein each base station in the LTE-A network includes identical predetermined code book, which includes：

- the first acquisition device, for obtaining the channel information of each downlink；

- tag device, for the channel information according to each downlink, the mark of generation each downlink It signs, the degree of correlation information between the precoding vector that the label includes the downlink and the code book simultaneously includes the code This highest precoding vector of the degree of correlation between the downlink；

- the first dispatching device, for when cooperateing with multi-point joint transmission, according to the label of each downlink, Dispatch each downlink.

Compared with prior art, the present invention has the following advantages：By in each collaboration base station, being given birth to for downlink Into label, and included in the label such as the degree of correlation information and phase between each downlink and the precoding vector of predetermined code book The highest precoding vectors of Guan Du pass through Tag switching between each layer of the protocol stack of base station and between each collaboration base station Information completes the operations such as scheduling of collaboration multi-point joint transmission, so that the system for reducing collaboration multi-point joint transmission is realized Complexity realizes acceptable system performance and the service quality of Cell Edge User, improves cell edge throughput.

Description of the drawings

By reading the detailed description made to non-limiting example made with reference to the following drawings, of the invention its Its feature, objects and advantages will become more apparent upon：

Fig. 1 shows to carry out an exemplary topology figure of collaboration multi-point joint transmission in LTE-A network；

Fig. 2 shows joining in the base station of LTE-A network for carrying out collaboration multiple spot for the embodiment of one aspect of the invention Close the flow chart of the method for transmission；

Fig. 3 shows the optional user of the definite collaboration multi-point joint transmission of one embodiment of one aspect of the present invention The method of equipment and obtain other collaboration base stations notice collaboration multi-point joint transmissions optional user equipment downlink The flow chart of the method for channel information；

Fig. 4 shows the scheduling candidate downlink in the base station of LTE-A network of another embodiment of one aspect of the invention The method flow diagram of link；

Fig. 5 a show that the definite candidate in the base station of LTE-A network of the further embodiment of one aspect of the invention uses The method flow diagram of family equipment；

The scheduling in the base station of LTE-A network Figure 5b shows that one embodiment of one aspect of the invention participates in downlink The method flow diagram of link；

Fig. 5 c show the interference coordination relation schematic diagram between the user equipment in the base station of LTE-A network of the present invention；

Fig. 6 show another aspect of the invention in the base station of LTE-A network for carrying out collaboration multi-point joint transmission Device schematic diagram；

The same or similar reference numeral represents the same or similar component in attached drawing.

Specific embodiment

The present invention is described in further detail below in conjunction with the accompanying drawings.

Fig. 1 shows to carry out one of the network of collaboration multi-point joint transmission in LTE-A network according to the present invention and exemplary opens up Flutter figure.In this embodiment, the LTE-A network includes multiple base stations 11, and base station 12 ... base station 1M and multiple users set Standby 21, user equipment 22 ... user equipment 2K.Identical predetermined code book C={ C is preserved in each base station₁,C₂,...C_l, in advance Determining code book has the mutual orthogonal characteristic of good auto-correlation wherein, and base station includes but not limited to eNodeB.Each cell can be with A base station is disposed, each base station can include several sectors can be between the base stations using being used for transmission customer service or control The interface of business processed communicates.Base station can directly or indirectly communicate with each user equipment.And each user equipment can be appointed What it is a kind of can wirelessly directly or indirectly and base station communication electronic equipment, including but not limited to：Mobile phone, PDA etc..This Outside, as a kind of preferred embodiment, each base station in the LTE-A network has more antennas, and each user equipment also has More antennas.Preferably, each user equipment in the LTE-A network and base station use TDD mode（time- Division duplexing mode, TDD mode) it receives and sends messages, it will be understood by those skilled in the art that each user sets Standby and base station transceiver information pattern is not limited with above-mentioned, such as this method principle can be equally applied to others, Such as use mode of frequency division duplexing（Frequency-division duplexing mode, FDD mode) system received and sent messages In.

As shown in Figure 1, in LTE-A network, for being in the user equipment of cell edge position, can utilize multiple Base station is more to the user's equipment transmission data namely collaboration simultaneously using the multi-path Orthogonal in space in identical running time-frequency resource Point joint transmission, to improve the handling capacity of cell edge.In addition, collaboration multi-point joint transmission can also utilize same base station Multiple sectors identical running time-frequency resource using space multi-path Orthogonal simultaneously to the user's equipment transmission data come reality Existing, the collaboration multi-point joint transmission between principle and base station is identical.For simplicity, hereinafter, we will be directed between base station Collaboration multi-point joint transmission be described.It will be understood by those skilled in the art that described herein carry out collaboration multi-point joint The principle of the method for transmission is applicable not only to the collaboration multi-point joint transmission between base station, and is also applied for the collaboration in base station Multi-point joint transmission；This method principle is also applied for the mode of other collaboration multi-point joint transmissions that may be present without carrying on the back From the spirit and scope of the present invention, and it is incorporated herein by reference.

Fig. 2 shows the method for cooperateing with multi-point joint transmission in a base station of the embodiment of one aspect of the invention Flow chart.

Specifically, in the step s 21, base station obtains the channel information of each downlink.In TDD networks, using upper and lower The reciprocity of row channel, the detectable signal that base station can be sent by obtaining user equipment, estimates the user's equipment to base station Uplink channel information, and the channel information of the downlink as base station to user equipment.The channel information is preferred Ground can be channel matrix, be denoted as H.Wherein, for each base station, such as base station 1m and each user equipment, as user sets Standby 2i, we use H^m, H_i,It represents to be connected to base station 1m respectively, is connected to user equipment 2i and base station 1m and user Channel matrix between equipment 2i, wherein H^m, H_i,For a part for channel matrix H.Due to those skilled in the art for The technology that base station and user equipment estimate channel information according to the information received has been known, therefore this will not be detailed here.

In a preferred embodiment, base station will also determine the collaboration multiple spot for by other base station being cooperateed with to notify this base station The channel information of the downlink of the optional user equipment of joint transmission.Collaboration base station refers to set for user jointly herein The standby base station for carrying out collaboration multi-point joint transmission.Cooperate with base station can be statically predetermined or dynamically really Fixed.The process for being dynamically determined collaboration base station hereinafter will be further illustrated.

Preferably, the optional user equipment of the collaboration multi-point joint transmission refers to the user positioned at cell edge position Equipment.When base station determine this base station service be located at cell edge position user equipment namely cooperate with multi-point joint transmission Optional user equipment after, will be sent to other collaboration base stations and obtain its to the optional of these collaboration multi-point joint transmissions The request message of the downlink channel information of family equipment.After other collaboration base stations receive the request message, it will get The channel information of the downlink of the optional user equipment of the collaboration multi-point joint transmission.

Fig. 3 show one embodiment of one aspect of the present invention according to the channel information of each downlink and/or Measurement result from each user equipment determines the method for the optional user equipment of collaboration multi-point joint transmission and obtains it He cooperate with base station notify this base station collaboration multiple spot user equipment downlink channel information method flow chart.

First, each base station in the LTE-A network determines the optional user equipment of respective collaboration multi-point joint transmission. Specifically, example is connected, is described by taking the 1m of base station as an example.For all user equipmenies that base station 1m is serviced, in step In S31, measurement result that base station 1m is reported according to the channel information and the user's equipment of downlink, to determine the use Whether family equipment is located at cell edge position.If the user is located at cell edge position, then the user's equipment can be used as collaboration The optional user equipment of multi-point joint transmission.For example, for the user equipment 2i of base station 1m services, 1m control users in base station set Standby 2i carries out channel measurement.After user equipment 2i is measured according to measurement request, by the measurement result of reporting channel measurement Give base station 1m.When the channel measurement that base station 1m requirements user equipment 2i is carried out is affair, user equipment 2i is by basis Event triggering criterion carries out event evaluation, and when event triggering criterion meets, user equipment 2i sends measurement knot to base station 1m Fruit, wherein different measurement report events can be included, such as the events such as A1, A2, A3, A4, A5.When base station, 1m receives use Measurement report event transmitted by the equipment 2i of family such as A3 events, is represented for user equipment 2i, neighbor cell service quality Close to serving cell, then base station 1m confirmations user equipment 2i, which is in cell edge position, can simultaneously be used as collaboration multi-point joint The optional user equipment of transmission.With above-mentioned same method, base station 1m determines all associations in the user equipment of this base station service With the optional user equipment of multi-point joint transmission.Each base station in the LTE-A network by it is above-mentioned it is same in a manner of determine it is each From collaboration multi-point joint transmission optional user equipment.It will be understood by those skilled in the art that definite collaboration described herein The method of the optional user equipment of multi-point joint transmission is descriptive and non-limiting, there are other various realization methods Without departing from the spirit and scope of the present invention, and it is incorporated herein by reference.

In a preferred embodiment, the base station in the LTE-A network can also be according to the channel of each downlink Information and/or measurement result from each user equipment determine one or more collaboration bases of collaboration multi-point joint transmission It stands.For example, connecting example, when base station, 1m receives the measurement report event transmitted by user equipment 2i, such as A3 events, represents For user equipment 2i, neighbor cell quality can be known close to serving cell, at this time base station 1m from measurement report event The base station of neighbor cell, such as base station 1n, then base station 1m is by the base station of the neighbor cell, as base station 1n as it cooperates with base station.With Such method, each base station can determine the collaboration base station of oneself.Preferably, each base station can establish multicast respectively Group, the collaboration base station of each base station are added in the multicast group, so as to be communicated with one another by Multicast group address.For example, collaboration base station Can respective load condition be exchanged by this multicast group, to determine to cooperate with the position of the resource block of multi-point joint transmission And size.

Then, it is each for the optional user equipment of the collaboration multi-point joint transmission in the step S32 shown in Fig. 3 Base station sends the request message for obtaining downlink channel information to other collaboration base stations.

Example is connected, the process that the request message is sent still is illustrated by taking the 1m of base station as an example.For example, in step S31, base The 1m that stands determines that the user equipment 2i and 2j of its service are the optional user equipment of collaboration multi-point joint transmission.In step s 32, Base station 1m sends the request message for the downlink channel information for getting the user's equipment 2i and 2j to other collaboration base stations. Since collaboration base station number can be one or more, it is preferable that base station 1m can use the mode of multicast to each collaboration Base station sends the detection message.Specifically, as it was noted above, collaboration base station, which is added to one, cooperates with the more of multi-point joint transmission Group is broadcast, then these collaboration base stations can exchange message by the Multicast group address.In this example, base station 1m can pass through this Multicast group address sends the downlink channel for getting user equipment 2i and user equipment 2j letter to each collaboration base station The request message of breath.In another embodiment, base station can also point of use to point mode to it is each collaboration base station send should please Seek message.In the same way, each base station in the LTE-A networks sends to other collaboration base stations and gets respective collaboration The request message of the downlink channel information of the optional user equipment of multi-point joint transmission.Those skilled in the art should manage Solution, it is described herein send obtain downlink channel information request message method be it is descriptive and non-limiting, In the presence of other various realization methods without departing from the spirit and scope of the present invention, and it is incorporated herein by reference.

Then, in the step S33 shown in Fig. 3, base station is received gets its collaboration multiple spot from other collaboration base stations The request message of the downlink channel information of the optional user equipment of joint transmission.Since those skilled in the art are for connecing The technology for receiving message has been known, is no longer described in detail herein.

In step S34, base station is receiving the request of the acquisition downlink channel information from other collaboration base stations After message, the channel information of the downlink of the optional user equipment of the collaboration multi-point joint transmission of other base stations will be got. Specifically, for example, each base station is by according to the process of above-mentioned acquisition channel information, the collaboration multiple spot to arrive other collaboration base stations joins The downlink for closing the optional user equipment of transmission measures and generates channel matrix.

Then, as shown in Fig. 2, in step S22, base station is according to the channel information of the downlink of acquisition, under generation is each The label of line link.Herein, each downlink includes cooperateing with base station to the user equipment of this base station service and to other Notify the downlink of the optional user equipment of the collaboration multi-point joint transmission of this base station.Wherein it is preferred to it is above two The method of downlink generation label is consistent.

It is the downlink life to user equipment 2i to illustrate base station 1m by taking base station 1m and user equipment 2i as an example below Into the process of label.Again, we use H^m, H_i,To represent to be connected to base station 1m, user equipment 2i and base station respectively Channel matrix between 1m and user equipment 2i, wherein H^m, H_i,For a part for channel matrix H.

In one embodiment, we determine the downlink between base station and user equipment and the predetermined code book C first ={C₁,C₂,...C_lEach precoding vector between the degree of correlation.Herein, the precoding of downlink and the predetermined code book to The degree of correlation between amount refers to the inner product of the downlink and precoding vector.For example, the user equipment 2i of base station 1m services, right Precoding vector C in predetermined code book C_k∈{C₁,C₂,...C_l, the degree of correlation isIf the relevance degree compared with Height then means that most of energy from base station 1m to the signal of the user's equipment 2i can be projected to precoding vector C_k The direction at place, and there is smaller interference between other directions.Preferably, we match to determine using maximum inner product That highest precoding vector of the highest degree of correlation and the degree of correlation between downlink,

The maximum inner product matching technique is well known to those skilled in the art, therefore is no longer described in detail herein.

Then, label is generated according to the identified degree of correlation and the highest precoding vector of the degree of correlation.It is preferred that Ground can classify to downlink according to highest relevance degree.It for example, can be according to such as empirical value or historical statistics Value is classified to set the threshold value of the highest degree of correlation according to threshold value.When the highest degree of correlation is higher than the threshold value, meaning Between the channel of the downlink and other directions has smaller interference, can generate " high-quality " label for it；And work as highest When the degree of correlation is not higher than the threshold value, " non-prime " label can be generated for it.It preferably, can also be according in the predetermined code book Label is generated with the information of that highest precoding vector of the downlink degree of correlation.For example it is assumed that C_kFor the degree of correlation most High precoding vector for above-mentioned " high-quality " downlink, can use 2*C_k, it is used as label for an even number value；And For " non-prime " downlink, 2*C can be used_k+ 1, it is used as label for an odd number value.It can be seen that from label In not only can obtain the highest precoding vector of the degree of correlation, while can also obtain the downlink the highest degree of correlation namely should Whether downlink has preferable channel condition.In addition, various other information can also be included in label, for example, RSRP （Reference Signal Received Power, reference signal receiving intensity）, these information it is subsequent scheduling waited It can be used in journey.It will be understood by those skilled in the art that herein, on the definite degree of correlation, generate the process of label with And the description of information that label includes is merely illustrative and non-limiting description, there are various other realization methods without carrying on the back Spirit or scope from the present invention, and be incorporated herein by reference.

According to the above method, base station 1m is that other downlinks generate label.And according to the above method, the LTE-A Each base station 11 in network, base station 12 ... ..., base station 1M come to generate label for each downlink in the same way.

Then, as shown in Fig. 2, in step S23, base station is when cooperateing with multi-point joint transmission, according to each downlink The label, to dispatch each downlink.Specifically, example is connected, illustrates that it dispatches each downlink by taking the 1m of base station as an example Process.Base station 1m is according to each downlink label value, for different system performance goals, to determine to carry out collaboration multiple spot The user equipment of joint transmission.For example, it is contemplated that reducing interference, prelisting for the downlink and the code book is determined according to label Degree of correlation information between code vector, the downlink that from the user equipment that this base station services the degree of correlation can be selected higher, Make i.e. when each other using different precoding vectors with the user equipment of the smaller downlink of interference of other interchannels To cooperate with the user equipment of multi-point joint transmission.Then, base station 1m dispatches other one or more collaboration base stations and is set to the user Standby downlink carries out collaboration multi-point joint transmission.It will be understood by those skilled in the art that herein, on each downlink of scheduling The description of link is merely illustrative and non-limiting description, there are various other realization methods without departing from the essence of the present invention God or scope, and be incorporated herein by reference.

Preferably, it is each to cooperate with base station that mark off certain frequency band in advance to avoid resource contention, to cooperate with multiple spot The resource block that the optional user of joint transmission is distributed will in this band, and what is marked off in each collaboration base station is somebody's turn to do Certain frequency band is identical.In addition, by the size for the resource block that user distributes it is identical between each collaboration base station.

In addition, as is it well known, to minimize inter-stream interference and inter-user interference, the optimal case in down channel It is using DPC（Dirty paper coding, dirty paper code）Scheme.However, DPC schemes complexity is very high and in base station Place needs to predict the substantial amounts of information of user.Therefore, will generally use as being based on force zero（ZF, Zero Forcing）Technology, Transmission is carried out at the same time by the multiple streams or user of the orthogonality for the space channel for selecting to have had, so as to be with relatively low System realize cost reduce stream between and inter-user interference.When cooperateing with multi-point joint transmission, since multiple base stations are simultaneously to be same A user equipment is transmitted, and is disturbed the inter-station interference coordinating, it is necessary to complicated to reduce, and is needed to use and such as be based on The joint precoding technique of force zero principle, but it will likely cause certain energy loss, especially when the plurality of base station to use There are during larger interference between the downlink of family equipment.Therefore need select disturb to each other smaller downlink come into Row collaboration multi-point joint transmission.As it was noted above, the predetermined code book and the downlink are included in the label of downlink The highest precoding vector of the link degree of correlation.According to codebook design principle, if the degree of correlation of two downlinks is highest pre- Coding vector is identical, generally means that there are stronger interference between two downlinks；, whereas if two downlinks The highest precoding vector of the degree of correlation of link is different, generally means that there is no stronger between two downlinks Interference.Therefore, according to the label of downlink, we can select the highest precoding vector of each degree of correlation differing from each other Downlink carry out collaboration multi-point joint transmission.In addition, as it is well known to the skilled in the art, base station can basis As force zero principle carries out user's pairing, and pairing user is carried out at the same time by signal transmission is to maximize using identical resource System handling capacity.Maximum can match number of users and can be predetermined, if for example, base station have 8 antennas, can be according to need Will, maximum can be matched into number of users and be set as no more than 8, be, for example, 4 value.In an embodiment of the method in accordance with the present invention, Each base station can determine that the maximum of this base station can match number of users according to the label of downlink.Specifically, base station is under each The degree of correlation information of downlink is determined in line link label.For example, as previously mentioned, even number class label mean the degree of correlation compared with Height namely when each other use different precoding vectors when it is smaller with the interference of other interchannels, and odd type label meaning Taste the degree of correlation it is relatively low namely when each other use different precoding vectors when it is larger with the interference of other interchannels.It is preferred that Ground, we can determine that maximum can match number of users according to the degree of correlation of downlink.If for example, base station it is all under Line link all has even tag, then means between each user equipment when using different precoding vectors to each other Interference is smaller, we, which can increase maximum, at this time can match number of users, such as be adjusted to 4, to improve throughput of system.On the contrary Ground, if all downlinks of base station all have odd tag, mean between each user equipment use it is different pre- Interference during coding vector to each other is larger, at this point, we, which can reduce maximum, can match number of users, is such as adjusted to 2, comes Ensure acceptable QoS of customer.And when the downlink of base station has the combination of even tag and odd tag, I Maximum can be matched number of users and be adjusted to 3.It will be understood by those skilled in the art that definite maximum described herein can The method for matching number of users is descriptive and non-limiting, there are other various realization methods without departing from the present invention's Spirit and scope.

It in a further embodiment of the method in accordance with the present invention, can be when cooperateing with multi-point joint transmission, under each The label of line link and the maximum determined according to the above method can match number of users to dispatch each downlink.Each collaboration base Standing can select not more than maximum that can match the user equipment of number of users to be carried out at the same time transmission.

Fig. 4 shows the scheduling candidate downlink in the base station of LTE-A network of another embodiment of one aspect of the invention The method flow diagram of link.

Specifically, example is connected, the process of its scheduling candidate downlink is illustrated by taking the 1m of base station as an example.In step S41 In, base station 1m is known related between the downlink and the precoding vector of the code book according to each downlink label value Spend information.When being scheduled, as described above, for different system performance objective, such as consider to reduce interference, it can be from this Base station service user equipment in, select the degree of correlation it is higher namely when each other use different precoding vectors when and other The user equipment of the smaller downlink of interference of interchannel, is such as user equipment 2i, the time as collaboration multi-point joint transmission Select user equipment.In addition it is also possible to reference to the degree of correlation and proportional fairness principle, in the user equipment serviced from this base station, choosing Select candidate user devices of the user equipment as collaboration multi-point joint transmission.Below to being incited somebody to action in the explanation of the embodiment of Fig. 5 a Further illustrate more preferred embodiments on definite candidate user devices.Then, base station 1m notifies that other collaborations are more The cooperation district of point joint transmission is scheduled preparation for candidate user devices 2i.Then, in step S42, it is preferable that Other cooperation districts can send the cooperation district to the label of the downlink of candidate user devices 2i to base station 1m.Then, Base station 1m selects the downlink wherein with higher degree of relation value according to the label received, as base station 1n is set to user The downlink of standby 2i, the candidate downlink as collaboration multi-point joint transmission.Then, in step S43, base station 1m tune Each candidate downlink is spent, downlink and base station 1n including this base station to user equipment 2i are to user equipment 2i's Downlink, to carry out collaboration multi-point joint transmission.Below to will be further illustrated in the explanation of the embodiment of Fig. 5 b on More preferred embodiments of scheduling candidate downlink.Since those skilled in the art after the completion of scheduling for cooperateing with The technology of multi-point joint transmission has been known, therefore this will not be detailed here.It will be understood by those skilled in the art that herein, on scheduling The description of each candidate downlink is merely illustrative and non-limiting description, there are various other realization methods without departing from The spirit or scope of the present invention, and be incorporated herein by reference.

Fig. 5 a show the label according to downlink of the embodiment of one aspect of the present invention, determine collaboration multiple spot connection Close the method flow diagram of the candidate user devices of transmission.

For simplicity, with three collaboration base stations, base station 1m, base station 1x are further illustrated exemplified by the 1y of base station.Fig. 5 c Interference coordination relation schematic diagram between the user equipment of base station is shown.Wherein as described above, the user equipment of base station can divide For the optional user equipment of collaboration multi-point joint transmission and the optional user equipment of miscoordination multi-point joint transmission.In Fig. 5 c, each base It stands respectively comprising two kinds of user equipment collection, for example, the optional user equipment collection of collaboration multi-point joint transmission that M is base station 1m, M ' For the optional user's collection of miscoordination multi-point joint transmission of base station 1m.There is connections between user equipment collection to mean to dividing When not belonging to user equipment progress user's pairing of two user equipment collection, interference is considered as, it is preferable that Force zero principle need to be met, that is, should not with the highest precoding vector of the degree of correlation of the downlink to such user equipment It is identical., whereas if the user for connecting and meaning to being belonging respectively to two user equipment collection is not present between user equipment collection Equipment carry out user's pairing when, be not required to consider interference, that is, with the downlink to such user equipment The highest precoding vector of the degree of correlation can be identical.In addition, it is used between the user equipment concentrated in same user equipment When family is matched, interference is also considered as, so as to should also select the phase with the downlink to such user equipment The highest precoding vectors of Guan Du should differ.Hereinafter, we will be further illustrated with reference to Fig. 5 c.

In step s 51, each base station in LTE-A determines the pre-scheduling user equipment of this base station.First, as previously mentioned, Each base station the degree of correlation between the precoding vector of each downlink and the code book is known according to the label value of each downlink Information.When being scheduled, as set forth above, it is possible to for different system performance objective, such as consider to reduce interference, Ke Yicong This base station service user equipment in, select the degree of correlation it is higher namely when each other use different precoding vectors when and its The user equipment of the smaller downlink of interference of his interchannel, the pre-scheduling user equipment as this base station.In addition, also may be used To consider proportional fairness principle, from this base station service collaboration multi-point joint transmission optional user equipment in make choice or It is to be made choice from the optional user equipment for the miscoordination multi-point joint transmission that this base station services.Further, it is also possible to reference to phase Guan Du makes choice with proportional fairness principle from the user equipment that this base station services.In a further advantageous embodiment, When being scheduled, user equipment can be classified according to different system performance goals, and adjusted respective by base station Weight.For example, cooperate with the optional user equipment of multi-point joint transmission and the optional user equipment adjustment of miscoordination multi-point joint transmission Respective weight, and be scheduled according to the height of weighted value.It, can will be non-for example, it is contemplated that better throughput of system The weight of the optional user equipment of collaboration multi-point joint transmission namely the user equipment in center of housing estate position is adjusted to 1.2, And the weighted value for cooperateing with the optional user equipment of multi-point joint transmission is adjusted to 1.0.In addition, for cooperateing with multi-point joint transmission Optional user equipment, can according to included in the difference and measurement event for the measurement event that it is reported with serving cell The information of base station of the close neighbor cell of service quality determine that it is the collaboration optional user of multi-point joint transmission in base station The optional user equipment of multi-point joint transmission is cooperateed between equipment or base station.It then can be according to similar system performance goals such as Maximum system throughput, to adjust the other weight of user equipment class of different collaboration multi-point joint transmissions.It for example, will be in base station The weight of the collaboration optional user equipment of multi-point joint transmission is adjusted to 1.0, and between base station multi-point joint transmission will be cooperateed with to can be selected The weight of family equipment is adjusted to 0.8.Next, for every a kind of user equipment, it can be by the weight of such user equipment and such User equipment sum is multiplied and draws its total weight, and from a kind of user equipment of total weight maximum a user is selected to set It is standby to be used as pre-scheduling user equipment.

It will be understood by those skilled in the art that the method for definite pre-scheduling user equipment described herein be it is descriptive and Non-limiting, there are other various realization methods without departing from the spirit and scope of the present invention, and wrap by reference It is contained in this.

Then, in step S52, each base station sent to other collaboration base stations comprising pre-scheduling user equipment information and To the pre-scheduling message of the label of the downlink of the pre-scheduling user equipment.Preferably, only when the selected pre-scheduling in base station When user equipment is cooperates with the optional user equipment of multi-point joint transmission, which sends described presetting to other collaboration base stations Spend information；It, should when the selected pre-scheduling user equipment in the base station is not to cooperate with the optional user equipment of multi-point joint transmission The user equipment for conventionally dispatching oneself is carried out miscoordination multi-point joint transmission and is no longer participate in subsequent by base station The scheduling and other operations of possible collaboration multi-point joint transmission；If the pre-scheduling user equipment of each base station is not association With the optional user equipment of multi-point joint transmission, then each base station will dispatch respectively downlink and carries out non-association respectively Same multi-point joint transmission.Since the downlink of each base station scheduling oneself carries out the technology of miscoordination multi-point joint transmission as this Known to field technology personnel, therefore this will not be detailed here.

Hereinafter, situation of the pre-scheduling user equipment for the optional user equipment of collaboration multi-point joint transmission will be illustrated.Under In text description, by taking the 1m of base station as an example, pre-scheduling user is user equipment 2j wherein determined by the 1m of base station, belongs to user and sets Standby collection M, to cooperate with the optional user equipment of multi-point joint transmission.Base station 1m will send pre-scheduling information to other collaboration base stations, Such asWherein, UE_jThe pre-scheduling user equipment is represented as 2j,Represent that base station 1m is set to the user The label of the downlink of standby 2j.Moreover it is preferred that base station, which can be this pre-scheduling equipment, determines precedence information.Example Such as, according to different system performance goals, base station can adjust the excellent of this pre-scheduling equipment with certain strategy and algorithm First grade.For example, base station 1m can use random number as the priority.In addition, when to consider that it is target to reduce interference, base The downlink and the code book can be obtained according to the label of the downlink to selected pre-scheduling user equipment by standing Degree of correlation information between precoding vector, and its priority is set according to degree of correlation height.If the degree of correlation is higher, then distribute Higher priority；If the degree of correlation is relatively low, then relatively low priority is distributed.In a further embodiment, such as can connect When the service quality received is target, base station 1m can also distribute its priority according to the QoS of pre-scheduling user equipment.Base station The precedence information can be included in the pre-scheduling information by 1m is sent to other collaboration base stations.Those skilled in the art should Understand, the method for definite precedence information described herein is descriptive and non-limiting, there are other various realizations Mode is incorporated herein by reference without departing from the spirit and scope of the present invention.

In a further advantageous embodiment, base station can also be by other relevant informations such as the pre-scheduling user equipment RSRP（Reference Signal Received Power, reference signal receiving intensity）, etc. information be sent to other collaborations Base station.

Preferably, base station can be sent out by the base station of foregoing Multicast group address to other collaboration multi-point joint transmissions The pre-scheduling message is sent, base station can also be sent by the base station of point-to-point mode to other collaboration multi-point joint transmissions The message.It will be understood by those skilled in the art that the mode that information described herein is sent is descriptive and non-limiting, In the presence of other various realization methods without departing from the spirit and scope of the present invention, and it is incorporated herein by reference.

Each base station in the LTE-A network is come to send respective pre-scheduling to other collaboration base stations in the same way Information.

Then, in step S53, each base station in the LTE-A network is received from the presetting of other collaboration base station transmissions Spend information.It knows since the technology of reception message is known to those skilled in the art, is no longer described in detail herein.

Then, in step S54, each base station in the LTE-A network determines the candidate user of collaboration multi-point joint transmission Equipment.In one embodiment, other associations are known in base station according to the pre-scheduling information from other collaboration base stations received With the selected pre-scheduling user equipment in base station and the label of corresponding downlink.It base station can be according to certain plan Slightly, such as the height of the degree of correlation according to indicated by label, come the pre-scheduling user equipment of the downlink that selects the degree of correlation higher Candidate user devices as this collaboration multi-point joint transmission.Preferably, when the message received includes above-mentioned priority During information, base station can be according to above-mentioned precedence information, to determine the candidate user devices of this collaboration multi-point joint transmission. For example, select candidate user devices of the user equipment of highest priority as this collaboration multi-point joint transmission.It presses each base station Same strategy take a picture to make choice, therefore each base station will select an identical pre-scheduling user equipment and be used as this collaboration The common candidate user devices of multi-point joint transmission.It will be understood by those skilled in the art that definite candidate described herein The mode of user equipment is descriptive and non-limiting, there is essence of other various realization methods without departing from the present invention God and scope, and be incorporated herein by reference.

Figure 5b shows that the label according to downlink of the embodiment of one aspect of the present invention, to cooperate with multi-point joint The candidate user devices of transmission, the method flow diagram of scheduling candidate downlink.

In step S55, each base station according to the label of each downlink, above-mentioned definite collaboration multi-point joint transmission The pre-scheduling user of candidate user devices and this base station determines the candidate downlink of the collaboration multi-point joint transmission.

It is assumed that the candidate user devices of collaboration multi-point joint transmission are user equipment 2i determined by preceding method, belong to User equipment collection M, the base station of serving cell is 1m.The collaboration base station of base station 1m is base station 1x and base station 1y.Wherein cooperate with base Pre-scheduling user equipment determined by 1x of standing is user equipment 2j, belongs to user equipment collection X, is cooperateed with pre- determined by the 1y of base station Scheduling user's set is user equipment 2k, belongs to user equipment collection Y.

Collaboration base station 1x gets the presetting of them from the pre-scheduling message from base station 1m and base station 1y received The downlink of user equipment is spent, the label of the downlink of the candidate user devices 2i including cooperateing with multi-point joint transmission,According to the label, base station 1x determine in the predetermined code book with the highest precoding of the downlink degree of correlation to It measures and is Also, according to the label of each downlink, base station 1x determines that it is arrived under user equipment 2i The label of line link,According to the label, base station 1x determine in the predetermined code book with the downlink degree of correlation Highest precoding vectorIn addition, pre-scheduling user equipment that base station 1x is determined to this base station namely User equipment 2j, the label of downlink beAccording to the label, base station 1x determine in the predetermined code book with The highest precoding vector of the downlink degree of correlation is

Preferably, base station 1x is according to Zero Forcing, by comparingWithWhether it is same precoding vector to determine It whether there is stronger inter-user interference between user equipment 2j and user equipment 2i.If that is,WithIt differs, then anticipates Taste user equipment 2j and user equipment 2i there is no stronger inter-user interference, and base station 1x will be with the pre-scheduling user of oneself Equipment 2j will not participate in this collaboration multi-point joint transmission as this scheduled user equipment of oneself.IfWithIdentical, base station 1x will not dispatch its identified pre-scheduling user and set to avoid interfering user equipment 2i Standby 2j.In this case, base station 1x is right according to Zero ForcingWithIt is compared, ifWithIt is identical, then it anticipates Taste from base station 1x to user equipment 2i and between the downlink base station 1m to user equipment 2i there are stronger interference, So as to which base station 1x will not participate in this collaboration multi-point joint transmission.In this case, base station 1x will be selected from user equipment collection X Select with user equipment 2i and with the pre-scheduling user equipment 2k of base station 1y meet Zero Forcing namely with the user's equipment phase The highest precoding vectors of Guan Du withWithDifferent user equipment, to be scheduled, if there is no such use Family equipment, base station 1x will abandon this time dispatcher from user equipment collection X namely the optional equipment collection for cooperateing with multi-point joint transmission Meeting.

Such asWithIt differs, then means from base station 1x to user equipment 2i and from base station 1m to user equipment 2i Downlink between there is no stronger interference, then base station 1x can participate in the collaboration multi-point joint transmission to user equipment 2i. Whether base station 1x further detects the RSRP measured values of user equipment 2i higher than predetermined threshold value, if above the threshold value, Then base station 1x determines its candidate downlink to the downlink of user equipment 2i as this collaboration multi-point joint transmission. And if less than the threshold value, base station 1x is not involved in this time collaboration multi-point joint transmission.Base station 1x will according to the method described above from Selection and user equipment 2i and meet Zero Forcing between the pre-scheduling user equipment 2k of base station 1y in user equipment collection X, I.e. with the highest precoding vector of the user's equipment degree of correlation withWithDifferent user equipment, to be scheduled, such as Fruit be not present such user equipment, base station 1x by abandon this time from user equipment collection X namely collaboration multi-point joint transmission can The dispatcher meeting of optional equipment collection.In addition, base station 1x can also select other users equipment from user equipment collection X ' and/or X It is used in conjunction with identical resource and carries out miscoordination multi-point joint transmission.Herein between these selected user equipmenies, And interference coordination relation between user equipment as shown in Figure 5 c should be met between user equipment 2i and user equipment 2k, And not more than maximum can match number of users.In addition, the measurement of correlation detection technique of the RSRP is those skilled in the art institute It is known, it is no longer described in detail herein.

After the same method, base station 1y can determine the candidate's downlink chain for this time cooperateing with multi-point joint transmission of oneself Road.

It will be understood by those skilled in the art that base station is cooperateed with according to information such as the labels of downlink, it can be in various manners It determines the candidate downlink of the collaboration multi-point joint transmission, and is not limited to the mode that property illustrated herein illustrates.There are various Other realization methods are incorporated herein without departing from the spirit and scope of the present invention in the form of reference.

Then in step S56, base station is cooperateed with to the base station of the serving cell of the candidate user of collaboration multi-point joint transmission Send the candidate downlink message of the label comprising the candidate downlink.Example is connected, herein, cooperates with base station 1x and association The candidate downlink of the collaboration multi-point joint transmission for user equipment 2i is determined respectively with base station 1y.Specifically, with collaboration It is further illustrated exemplified by the 1x of base station.Preferably, cooperate with base station 1x can be to the base of the serving cell of candidate user devices 2i The 1m that stands is sent such asMessage, whereinFor the collaboration candidate downlink of base station 1x namely base station 1x To the label of the downlink of user equipment 2i.With same method, collaboration base station 1y is sent to base station 1m comprising under its candidate The candidate downlink message of line link label.Preferably, cooperation district can also add the RSRP values of the candidate downlink Enter in label to be sent.

Then, in step S57, the base station of the serving cell of candidate user devices according to the label of each downlink, with And the candidate downlink message for including candidate downlink label received, to determine the collaboration multiple spot of candidate user devices The participation downlink of joint transmission.Specifically, example is connected, base station 1m is received from collaboration base station 1x and collaboration base station 1y Candidate downlink messageKnow the candidate downlink of base station 1x and base station 1y It is respectively provided with labelWithAccording to different system performance goals, base station 1m can be come using different strategies Determine the participation downlink of this collaboration multi-point joint transmission.In a preferred embodiment, interference is reduced for consideration, Base station 1m can determine the degree of correlation between the precoding vector of candidate downlink and the predetermined code book from label, and select Select participation downlink of the higher candidate downlink of the wherein degree of correlation as this collaboration multi-point joint transmission.Preferably, When containing the RSRP value informations of the candidate downlink in label, base station 1m can also select the candidate with this base station The more similar candidate downlink of RSRP values of downlink；Or by the degree of correlation and RSRP values and candidate's downlink chain of this base station The phase recency weighting summation of the RSRP values on road, and the candidate downlink for selecting weights larger is as this collaboration multi-point joint The participation downlink of transmission.It will be understood by those skilled in the art that it can determine the collaboration with various realization methods herein The participation downlink of multi-point joint transmission, and it is not limited to the mode that property illustrated herein illustrates.There are various other realizations Mode is incorporated herein by reference without departing from the spirit and scope of the present invention.

Then, in step S58, the base station of the serving cell of candidate user devices is sent to other collaboration base stations to be included Participate in the participation downlinlc message of downlink label.As previously described, it is assumed that under the candidate of base station 1m selection collaborations base station 1x Line link is as participation downlink.Base station 1m will be sent to collaboration base station 1x and collaboration base station 1y comprising this collaboration multiple spot The message of the participation downlink of joint transmission.Base station 1m can send the message by way of multicast, such as by upper It states collaboration base station Multicast group address to send, such asMessage, wherein UE_iFor the candidate User equipment 2i, PCI_m, PCI_xThe respectively Physical Cell Identifier of base station 1m and base station 1x（PCI, Physical Cell Identifier）,WithThe label of the participation downlink of respectively base station 1m and base station 1x.Preferably, base Standing 1m can also be by other information, such as resource block location, MCS（Modulation and Coding Scheme, modulation are compiled Code scheme etc., which is added in label, to be sent.Base station 1m can also be by point-to-point mode come to base station 1x and base station 1y Send the message.It will be understood by those skilled in the art that message can be sent with various realization methods herein, and it is without being limited thereto The mode of place exemplary illustration.There are various other realization methods without departing from the spirit and scope of the present invention, and to draw Mode is incorporated herein.

Then, it is each that base station reception is cooperateed with to disappear comprising the participation downlink for participating in downlink label in step S59 Breath.It knows since the technology of reception message is known to those skilled in the art, is no longer described in detail herein.

Then, it is each to cooperate with base station according to downlinlc message is participated in step S510, to cooperate with the time of multi-point joint transmission Family is selected, scheduling participates in downlink.Example is connected, collaboration base station 1x receives message The downlink for knowing this base station to user equipment 2i is selected as to participate in downlink, it is preferable that collaboration base station 1x may be used also To know that such as MCS, resource block location etc. disappear from participating in participating in the label of downlink included in downlinlc message Then breath cooperates with base station 1x to dispatch the downlink accordingly to carry out collaboration multi-point joint transmission for user equipment 2i.And it cooperates with After base station 1y receives the message, it will know that its downlink to user equipment 2i is not selected for participating in downlink, because This collaboration base station 1y can continue to select other user equipmenies according to the above method to be scheduled and carry out non- Cooperate with multi-point joint transmission.Due to carrying out follow-up collaboration multi-point joint transmission/miscoordination multi-point joint transmission after the completion of scheduling Technology it is known to those skilled in the art know, be no longer described in detail herein.

In addition, in a preferred embodiment, when cooperateing with multi-point joint transmission, base station can also be according to downlink Label, determine the precoding weight for signal transmission of downlink.Specifically, connect example, come by taking the 1m of base station as an example into One step explanation.Base station 1m is according to the label of the downlink of this base stationCan determine with the downlink with it is described pre- Determine that highest precoding vector of the degree of correlation in the precoding vector of code book.In addition, as described above, base station 1m can be with Using identical resource the other users device transmission signal of number of users can be matched to not more than maximum simultaneously.Similarly, base station 1m can obtain the downlink correspondingly precoding vector using it to the label of the downlink of other users equipment.It connects It, base station 1m can determine that it is used for the precoding weight of signal transmission according to these precoding vectors, and can basis This precoding weight carries out precoding to signal to be transmitted.Precoding weight is determined herein according to precoding vector Method is known to those skilled in the art to be known, and is no longer described in detail herein.

Fig. 6 shows to carry out collaboration multi-point joint transmission in the base station of LTE-A network according to a further aspect of the present invention Schematic device.Wherein, the LTE-A network includes multiple base stations 11, base station 12 ... base station 1M and multiple user equipmenies 21, user equipment 22 ... user equipment 2K（User equipment is not shown）.Wherein, as shown in fig. 6, each base station includes being used for respectively Carry out the device 111 of collaboration multi-point joint transmission, device 121 ... device 1M1.Hereinafter this is used to carry out collaboration multiple spot The device of joint transmission will be referred to as collaborative device.Collaborative device includes the first acquisition device, and tag device and first Dispatching device.Identical predetermined code book C={ C is preserved in each base station₁,C₂,...C_l, predetermined code book has good from phase Close mutually orthogonal characteristic.Wherein, base station includes but not limited to eNodeB.Each cell can dispose a base station, Mei Geji Several sectors can be included by standing.It can be led between the base stations using the interface for being used for transmission customer service or control business Letter.Base station can directly or indirectly communicate with each user equipment.And each user equipment can be that any one can be wirelessly Direct or indirect and base station communication electronic equipment, includes but not limited to：Mobile phone, PDA etc..In addition, as a kind of preferred side Formula, each base station in the LTE-A network have more antennas, and each user equipment also has more antennas.

Preferably, each user equipment in the LTE-A network and base station use TDD mode（time-division Duplexing mode, TDD mode) it receives and sends messages, it will be understood by those skilled in the art that each user equipment and base station are received The pattern of photos and sending messages is not limited with above-mentioned, such as this method principle can be equally applied to others, such as double using frequency division Work pattern（Frequency-division duplexing mode, FDD mode) in the system received and sent messages.

In LTE-A network, for being in the user equipment of cell edge position, multiple base stations can be utilized identical Running time-frequency resource using space multi-path Orthogonal simultaneously to the user's equipment transmission data namely collaboration multi-point joint transmission, To improve the handling capacity of cell edge in addition, collaboration multi-point joint transmission can also utilize multiple sectors of same base station to exist Identical running time-frequency resource realized using the multi-path Orthogonal in space to the user's equipment transmission data simultaneously, principle and base Collaboration multi-point joint transmission between standing is identical.For simplicity, hereinafter, we will join for the collaboration multiple spot between base station Transmission is closed to be described.It will be understood by those skilled in the art that the method described herein for carrying out collaboration multi-point joint transmission Principle is applicable not only to the collaboration multi-point joint transmission between base station, and the collaboration multi-point joint transmission being also applied in base station； This method principle is also applied for essence of the mode without departing from the present invention of other collaboration multi-point joint transmissions that may be present God and scope, and be incorporated herein by reference.

Specifically, the first acquisition device obtains the channel information of each downlink.In TDD networks, believed using uplink and downlink The reciprocity in road, the detectable signal that the first acquisition device can be sent by obtaining user equipment, estimates the user's equipment and arrives The channel information of the uplink of base station, and the channel information of the downlink as base station to user equipment.The channel information It can be preferably channel matrix, be denoted as H.Wherein, for each base station, such as base station 1m and each user equipment, such as use Family equipment 2i, we use H^m, H_i,Represent to be connected to base station 1m respectively, be connected to user equipment 2i and base station 1m with Channel matrix between user equipment 2i, wherein H^m, H_i,For a part for channel matrix H.Due to those skilled in the art Know for the technology that channel information is estimated according to the information received, therefore this will not be detailed here.

In a preferred embodiment, collaborative device will also determine the collaboration for by other base station being cooperateed with to notify this base station The channel information of the downlink of the optional user equipment of multi-point joint transmission.Collaboration base station refers to use jointly herein Family equipment carries out the base station of collaboration multi-point joint transmission.Collaboration base station can be statically predetermined or dynamic What ground determined.The process for being dynamically determined collaboration base station hereinafter will be further illustrated.

Preferably, the optional user equipment of the collaboration multi-point joint transmission refers to the user positioned at cell edge position Equipment.When collaborative device determine this base station service be located at cell edge position user equipment namely cooperate with multi-point joint After the optional user equipment of transmission, by sent to other collaboration base stations obtain its to these cooperate with multi-point joint transmissions can Select the request message of the downlink channel information of user equipment.When the collaborative device of other collaboration base stations receives described ask After seeking message, the channel information of the downlink of the optional user equipment of the collaboration multi-point joint transmission will be got.

In a preferred embodiment, collaborative device includes for the channel information according to each downlink and/or comes from The optional user equipment determining device of the measurement result of each user equipment and for for collaboration multi-point joint transmission can be selected Family equipment obtains downlink channel letter to for other one or more collaboration base stations of multi-point joint transmission to be cooperateed with to send The request message sending device of the request message of breath；In addition, the first acquisition device includes receiving from other collaboration bases The request message for the acquisition downlink channel information stood and for obtain other collaboration base stations notify that the collaboration of this base station is more Second acquisition device of the downlink channel information of point user equipment.

First, the optional user equipment determining device of each collaboration base station in the LTE-A network determines each collaboration base station Cooperate with the optional user equipment of multi-point joint transmission.Specifically, example is connected, is described by taking the 1m of base station as an example.For base station All user equipmenies that 1m is serviced, channel information and the user of the optional user equipment determining device according to downlink The measurement result that equipment is reported, to determine whether the user's equipment is located at cell edge position.As the user is located at cell Marginal position, then the user's equipment can be as the optional user equipment of collaboration multi-point joint transmission.For example, it is taken for base station 1m The user equipment 2i of business, base station 1m control user equipment 2i carry out channel measurement.When user equipment 2i is carried out according to measurement request After measurement, the measurement result that reporting channel measures is given to base station 1m.When the channel that base station 1m requirement user equipmenies 2i is carried out is surveyed Measure for affair when, user equipment 2i will according to event triggering criterion carry out event evaluation, when event triggering criterion meet When, user equipment 2i sends measurement result to base station 1m, wherein different measurement report events can be included, such as A1, A2, The events such as A3, A4, A5.When base station, 1m receives the measurement report event transmitted by user equipment 2i, such as A3 events, represents For user equipment 2i, neighbor cell quality confirms close to serving cell, the then optional user equipment determining device of base station 1m User equipment 2i is in cell edge position simultaneously can be as the optional user equipment of collaboration multi-point joint transmission.With above-mentioned same The method of sample, the optional user equipment determining device of base station 1m determine that all collaborations in the user equipment of this base station service are more The optional user equipment of point joint transmission.The optional user equipment determining device of each base station in the LTE-A network is with above-mentioned Same mode determines the optional user equipment of respective collaboration multi-point joint transmission.It will be understood by those skilled in the art that herein The described device for definite collaboration multi-point joint transmission is descriptive and non-limiting, there are other various realities Existing mode is incorporated herein by reference without departing from the spirit and scope of the present invention.

In a preferred embodiment, the optional user equipment of the collaborative device of the base station in the LTE-A network determines to fill Put further include for the channel information according to each downlink and/or the measurement result from each user equipment come Determine the collaboration base station determining device of one or more collaboration base stations of collaboration multi-point joint transmission.For example, connecting example, work as base The 1m that stands receives the measurement report event transmitted by user equipment 2i, such as A3 events, represents for user equipment 2i, adjacent Cell quality can be known close to serving cell, at this time the collaboration base station determining device of base station 1m from measurement report event The base station of neighbor cell such as base station 1n, then cooperates with base station determining device should by the base station of the neighbor cell, such as base station 1n conducts The collaboration base station of base station.With such method, the collaboration base station determining device of each base station can determine the association of the base station Same base station.Preferably, the collaborative device of each base station can establish the multicast group of collaboration multi-point joint transmission, each base station respectively Collaboration base station add in the multicast group, so as to being communicated with one another by Multicast group address.For example, collaboration base station can pass through This multicast group exchanges respective load condition, to determine to cooperate with the position of the resource block of multi-point joint transmission and size.

Then, it is the optional user equipment of the collaboration multi-point joint transmission, the request message sending device of each base station The request message for obtaining downlink channel information is sent to other collaboration base stations.

Example is connected, the process that the request message is sent is illustrated by taking the request message sending device of base station 1m as an example.Example Such as, the optional user equipment determining device of base station 1m determines the user equipment 2i and 2j of its service for collaboration multi-point joint transmission Optional user equipment.The request message sending device of base station 1m sends to other collaboration base stations and gets the user's equipment 2i With the request message of the downlink channel information of 2j.Since collaboration base station number can be one or more, it is preferable that base Stand 1m request message sending device can use multicast mode to it is each collaboration base station send the detection message.Specifically, As it was noted above, collaborative device can be respectively the multicast group that collaboration multi-point joint transmission is established in base station, collaboration base station is added to The multicast group of the collaboration multi-point joint transmission, then these collaboration base stations can pass through the Multicast group address exchange message. In this example, the request message sending device of base station 1m can send the acquisition by this Multicast group address to each collaboration base station To user equipment 2i and the request message of the downlink channel information of user equipment 2j.In another embodiment, base station Request message sending device can also point of use to point mode to it is each collaboration base station send the request message.With same side Method, the request message sending device of each base station in the LTE-A network is sent to other collaboration base stations gets respective association With the request message of the downlink channel information of the optional user equipment of multi-point joint transmission.Those skilled in the art should manage Solution, the device of the request message described herein that downlink channel information is obtained for transmission is descriptive and non-limiting Property, there are other various realization methods without departing from the spirit and scope of the present invention, and be contained in by reference This.

Then, request message reception device is received gets its collaboration multi-point joint transmission from other collaboration base stations Optional user equipment downlink channel information request message.Since those skilled in the art are for receiving message Technology has been known, is no longer described in detail herein.

Base station receives the request of the acquisition downlink channel information from other collaboration base stations in request reception device After message, the second acquisition device will get the downlink chain of the optional user equipment of the collaboration multi-point joint transmission of other base stations The channel information on road.Specifically, for example, the second acquisition device of each base station by according to obtain channel information process, to arrive it He cooperates with the downlink of the optional user equipment of the collaboration multi-point joint transmission of base station to measure and generates channel matrix.

Then, tag channel information of the device according to the downlink of acquisition, generates the label of each downlink.This Place, each downlink include the user equipment serviced to this base station and the association of this base station are notified to other collaboration base stations With the downlink of the optional user equipment of multi-point joint transmission.Wherein it is preferred to it is above two downlink generation mark The method of label is consistent.

The device that tags for illustrating base station 1m by taking base station 1m and user equipment 2i as an example below is to user equipment 2i Downlink generation label process.Again, we use H^m, H_i,To represent to be connected to base station 1m, Yong Hushe respectively Standby channel matrix between 2i and base station 1m and user equipment 2i, wherein H^m, H_i,For a part for channel matrix H.

In one embodiment, the device that tags is included for the channel information according to each downlink, determines each downlink The degree of correlation between the downlink of the degree of correlation and predetermined code book between the precoding vector of link and predetermined code book is most The degree of correlation determining device of high precoding vector and for according to the degree of correlation and the highest precoding vector of the degree of correlation, Generate the label generating means of the label of each downlink.

Degree of correlation determining device determines the downlink between base station and user equipment and the predetermined code book C={ C first₁, C₂,...C_lEach precoding vector between the degree of correlation.Herein, between the precoding vector of downlink and the predetermined code book The degree of correlation refers to the inner product of the downlink and precoding vector.For example, the user equipment 2i of base station 1m services, for predetermined Precoding vector C in code book C_k∈{C₁,C₂,...C_l, the degree of correlation isIf the relevance degree is higher, anticipate Most of energy that taste from base station 1m to the signal of the user's equipment 2i can be projected to precoding vector C_kPlace Direction, and there is smaller interference between other directions.Preferably, degree of correlation determining device matches to come using maximum inner product Determine the highest degree of correlation and that highest precoding vector of the degree of correlation between downlink,

Maximum inner product matching is well known to those skilled in the art, therefore is no longer described in detail herein.

Then, label generating means are according to the identified degree of correlation and the degree of correlation highest precoding vector next life Into label.Preferably, label generating means can classify to downlink according to highest relevance degree.For example, it can With according to if empirical value or historical statistics value are to set the threshold value of the highest degree of correlation, and classified according to threshold value.Work as highest When the degree of correlation is higher than the threshold value, it is meant that there is smaller interference, label life between the channel of the downlink and other directions " high-quality " label can be generated into device for it；And when the highest degree of correlation is not higher than the threshold value, label generating means can be it Generate " non-prime " label.Preferably, label generating means can also be according to related to the downlink in the predetermined code book The information of that highest precoding vector is spent to generate label.For example it is assumed that C_kFor the highest precoding vector of the degree of correlation, For above-mentioned " high-quality " downlink, 2*C can be used_k, it is used as label for an even number value；And under " non-prime " Line link can use 2*C_k+ 1, it is used as label for an odd number value.It can be seen that it not only can obtain correlation from label Highest precoding vector is spent, while can also obtain whether the highest degree of correlation of the downlink namely the downlink have Preferable channel condition.In addition, various other information can also be included in label, for example, RSRP（Reference Signal Received Power, reference signal receiving intensity）, these information it is subsequent scheduling etc. during can be used.This Field technology personnel should be understood that herein, on degree of correlation determining device, information that label generating means and label include Description is merely illustrative and non-limiting description, there are various other realization methods without departing from the spirit or model of the present invention Farmland, and be incorporated herein by reference.

According to the above method, the device that tags of base station 1m is that other downlinks generate label.And according to above-mentioned Method, each base station 11 in the LTE-A network, base station 12 ... ..., base station 1M's tags device in the same way To generate label for each downlink.

Then, the first dispatching device is when cooperateing with multi-point joint transmission, according to the label of each downlink, to adjust Spend each downlink.Specifically, example is connected, illustrates that it dispatches each downlink by taking the first dispatching device of base station 1m as an example Process.The first dispatching device of base station 1m, for different system performance goals, comes according to each downlink label value It determines to carry out the user equipment for cooperateing with multi-point joint transmission.For example, being disturbed for considering to reduce, the first dispatching device is according to mark Label determine the degree of correlation information between the precoding vector of the downlink and the code book, the user that can be serviced from this base station Selected in equipment the higher downlink of the degree of correlation namely when using different precoding vectors each other with other interchannels The user equipment of the smaller downlink of interference be used as the user equipment of collaboration multi-point joint transmission.Then, base station 1m First dispatching device dispatches other one or more collaboration base stations and carries out collaboration multiple spot to the downlink of the user's equipment Joint transmission.It will be understood by those skilled in the art that herein, the description as described in the first dispatching device is merely illustrative and non-limiting Property description, there are various other realization methods without departing from the spirit or scope of the present invention, and are contained in by reference This.

Another embodiment of the first dispatching device of the collaborative device of the present invention is further described below.First scheduling Device is included for the label according to downlink, determines the first candidate of the candidate user devices of collaboration multi-point joint transmission User equipment determining device；Candidate for the label according to each downlink and identified collaboration multi-point joint transmission uses Family equipment determines the first candidate downlink determining device of the candidate downlink of collaboration multi-point joint transmission；And it is used for When cooperateing with multi-point joint transmission, according to the label of each downlink, to cooperate with the candidate user devices of multi-point joint transmission, Second dispatching device of scheduling candidate downlink.

Preferably, to avoid resource contention, each collaborative device for cooperateing with base station can mark off certain frequency band in advance, The resource block distributed for the optional user for cooperateing with multi-point joint transmission will in this band.And in each collaboration base station The certain frequency band marked off is identical.In addition, the size of the resource block distributed between each collaboration base station by user It is identical.

In addition, as is it well known, to minimize inter-stream interference and inter-user interference, the optimal case in down channel It is using DPC（Dirty paper coding, dirty paper code）Scheme.However, DPC schemes complexity is very high and in base station Place needs to predict the substantial amounts of information of user.Therefore, will generally use as being based on force zero（ZF, Zero Forcing）Technology, Transmission is carried out at the same time by the multiple streams or user of the orthogonality for the space channel for selecting to have had, so as to be with relatively low System realize cost reduce stream between and inter-user interference.When cooperateing with multi-point joint transmission, since multiple base stations are simultaneously to be same A user equipment is transmitted, and is disturbed the inter-station interference coordinating, it is necessary to complicated to reduce, and is needed to use and such as be based on The joint precoding technique of force zero principle, but it will likely cause certain energy loss, especially when the plurality of base station to use There are during larger interference between the downlink of family equipment.Therefore need select disturb to each other smaller downlink come into Row collaboration multi-point joint transmission.As it was noted above, the predetermined code book and the downlink are included in the label of downlink The highest precoding vector of the link degree of correlation.According to codebook design principle, if the degree of correlation of two downlinks is highest pre- Coding vector is identical, generally means that there are stronger interference between two downlinks；, whereas if two downlinks The highest precoding vector of the degree of correlation of link is different, generally means that there is no stronger between two downlinks Interference.Therefore, according to the label of downlink, collaborative device can not select the highest precoding vector of each degree of correlation each other not Identical downlink carries out collaboration multi-point joint transmission.

In addition, as it is well known to the skilled in the art, base station can according to such as force zero principle carry out user's pairing, and Signal transmission is carried out at the same time with maximum system throughput to pairing user using identical resource.Maximum can match number of users Can be predetermined, if for example, base station have 8 antennas, can be as needed, by maximum can match number of users setting It is, for example, 4 value to be not more than 8.In the embodiment of collaborative device according to the present invention, the maximum of each base station can match use Amount determining device determines that the maximum of this base station can match number of users according to the label of downlink.Specifically, base station is most The degree of correlation information that number of users determining device determines downlink from each downlink label can be matched greatly.For example, such as preceding institute State, even number class label mean the degree of correlation it is higher namely when each other use different precoding vectors when with other interchannels Interference it is smaller, and odd type label mean the degree of correlation it is relatively low namely when each other use different precoding vectors when with The interference of other interchannels is larger.Preferably, it is maximum can match number of users determining device can be according to the channel item of downlink Part determines that maximum can match number of users.For example, if all downlinks of base station all have even tag, mean When using different precoding vectors, mutual interference is smaller between each user equipment, and maximum can match number of users at this time Determining device, which can increase maximum, can match number of users, such as be adjusted to 4, to improve throughput of system.If on the contrary, base station All downlinks all there is odd tag, then mean between each user equipment when using different precoding vectors Mutual interference is larger, can reduce maximum at this point, maximum can match number of users determining device and can match number of users, such as adjusts Whole is 2, to ensure acceptable QoS of customer.And when the downlink of base station has even tag and odd tag During combination, maximum, which can match number of users determining device and can maximum can be matched number of users, is adjusted to 3.Those skilled in the art It is to be understood that it is descriptive and non-limiting that maximum described herein, which can match number of users determining device, exist other each Kind realization method is without departing from the spirit and scope of the present invention.

In another embodiment of collaborative device according to the present invention, the first dispatching device further includes cooperateing with During multi-point joint transmission, number of users can be matched according to the label of each downlink and the maximum, to dispatch 4th dispatching device of each downlink.Specifically, respectively the 4th dispatching device of collaboration base station can select not more than most The user equipment of number of users can be matched greatly to be carried out at the same time transmission.

Specifically, example is connected, the mistake of its scheduling candidate downlink is illustrated by taking the first dispatching device of base station 1m as an example Journey.

First, the first candidate user devices determining device of base station 1m is known according to each downlink label value under this Degree of correlation information between the precoding vector of line link and the code book.First candidate user devices determining device, as above institute It states, for different system performance objective, such as considers to reduce interference, phase can be selected from the user equipment that this base station services Guan Du higher namely when each other using different precoding vectors with the smaller downlink of interference of other interchannels User equipment is such as user equipment 2i, the candidate user devices as collaboration multi-point joint transmission.In addition it is also possible in addition, The degree of correlation and proportional fairness principle can also be combined, in the user equipment serviced from this base station, selects user equipment as association With the candidate user devices of multi-point joint transmission.Illustrate further below on the first candidate user devices determining device More preferred embodiments.Then, the first candidate user devices determining device of base station 1m notifies other collaboration multiple spot connection It closes the cooperation district of transmission and is scheduled preparation for candidate user devices 2i.Then, it is preferable that the association of other cooperation districts The cooperation district can be sent to base station 1m to the label of the downlink of candidate user devices 2i with device.Then, base station 1m The first candidate downlink determining device according to the label received, selection wherein has the downlink chain of higher degree of relation value Road, such as base station 1n to the downlink of user equipment 2i, the candidate downlink as collaboration multi-point joint transmission.Then, The second dispatching device of base station 1m dispatches each candidate downlink, the downlink including this base station to user equipment 2i with And base station 1n is to the downlink of user equipment 2i, to carry out collaboration multi-point joint transmission.Illustrate further below on More preferred embodiments of second dispatching device.Since those skilled in the art after the completion of scheduling for carrying out collaboration multiple spot The technology of joint transmission has been known, therefore this will not be detailed here.It will be understood by those skilled in the art that it herein, is adjusted on second The description of degree device is merely illustrative and non-limiting description, there are various other realization methods without departing from the present invention's Spirit or scope, and be incorporated herein by reference.

The first candidate user devices determining device of the collaborative device of the present invention is illustrated below.First candidate user is set Standby determining device includes for the label according to each downlink, determining the presetting of the pre-scheduling user equipment of this base station service Spend user equipment determining device；For being sent to other collaboration base stations comprising pre-scheduling user equipment information and presetting to this The pre-scheduling message of the pre-scheduling information of the label of the downlink of user equipment is spent with regard to sending device；For receiving from it He cooperate with base station comprising pre-scheduling user equipment information and to the pre-scheduling user equipment downlink label it is pre- The pre-scheduling message receiving apparatus of scheduling message；For according to identified pre-scheduling user equipment, received come from it He cooperates with the pre-scheduling message of base station and the label of each downlink, determines that a candidate of collaboration multi-point joint transmission uses Second candidate user devices determining device of family equipment.

For simplicity, with three collaboration base stations, base station 1m, base station 1x are further illustrated exemplified by the 1y of base station.Further Secondary, Fig. 5 c show the interference coordination relation schematic diagram between the user equipment of base station.Wherein as described above, the user of base station sets It is standby to be divided into the optional user equipment of collaboration multi-point joint transmission and the optional user equipment of miscoordination multi-point joint transmission.Figure In 5c, each base station is respectively comprising two kinds of user equipment collection, such as the optional user of collaboration multi-point joint transmission that M is base station 1m Equipment collection, the optional user's collection of miscoordination multi-point joint transmission that M ' is base station 1m.There is connections between user equipment collection to anticipate When taste user equipment progress user's pairing to being belonging respectively to two user equipment collection, interference is considered as, Preferably, force zero principle need to be met, that is, with the highest precoding of the degree of correlation of the downlink to such user equipment to Amount should differ.To mean, whereas if there is no connections between user equipment collection to being belonging respectively to two user equipment collection User equipment carry out user's pairing when, be not required to consider interference, that is, with the downlink to such user equipment The highest precoding vector of the degree of correlation of link can be identical.In addition, between the user equipment concentrated in same user equipment When carrying out user's pairing, interference is also considered as, so as to should also select and the downlink chain to such user equipment The highest precoding vector of the degree of correlation on road should differ.Hereinafter, we will be further illustrated with reference to Fig. 5 c.

First, the pre-scheduling user equipment determining device of each base station in LTE-A determines that the pre-scheduling user of this base station sets It is standby.As previously mentioned, the pre-scheduling user equipment determining device of each base station knows each downlink according to the label value of each downlink Degree of correlation information between the precoding vector of link and the code book.Pre-scheduling user equipment determining device, as described above, can To be directed to different system performance objective, such as consideration reduction interference, phase can be selected from the user equipment that this base station services Guan Du higher namely when each other using different precoding vectors with the smaller downlink of interference of other interchannels User equipment, the pre-scheduling user equipment as this base station.In addition it is also possible to consider proportional fairness principle, serviced from this base station Collaboration multi-point joint transmission optional user equipment in make choice or from this base station service miscoordination multi-point joint It is made choice in the optional user equipment of transmission.Further, it is also possible to come with reference to the degree of correlation and proportional fairness principle from this base station It is made choice in the user equipment of service.In a further advantageous embodiment, pre-scheduling user equipment determining device can basis Different system performance goals, user equipment is classified, and adjusts respective weight.For example, multi-point joint is cooperateed with to pass Defeated optional user equipment and the optional user equipment of miscoordination multi-point joint transmission adjust respective weight, and according to weighted value Height is determined.For example, it is contemplated that better throughput of system, pre-scheduling user equipment determining device can be by non-association With the optional user equipment of multi-point joint transmission namely the weight of the user equipment in center of housing estate position is adjusted to 1.2, and The weighted value for cooperateing with the optional user equipment of multi-point joint transmission is adjusted to 1.0.It in addition, can for collaboration multi-point joint transmission User equipment is selected, pre-scheduling user equipment determining device can be according to the difference and measurement event of the measurement event that it is reported Included in the information of base station of the neighbor cell close with the service quality of serving cell assisted to determine that it is in base station With the collaboration optional user equipment of multi-point joint transmission between the optional user equipment of multi-point joint transmission or base station.Then pre-scheduling User equipment determining device can be more to adjust different collaborations according to similar system performance goals such as maximum system throughput The other weight of user equipment class of point joint transmission.For example, pre-scheduling user equipment determining device will cooperate with multiple spot to join in base station The weight for closing the optional user equipment of transmission is adjusted to 1.0, and the optional user equipment of multi-point joint transmission will be cooperateed between base station Weight is adjusted to 0.8.Next, for every a kind of user equipment, pre-scheduling user equipment determining device can set such user Standby weight is multiplied with such user equipment sum and draws its total weight, and from a kind of user equipment of total weight maximum A user equipment is selected as pre-scheduling user equipment.

It will be understood by those skilled in the art that pre-scheduling user equipment determining device described herein be it is descriptive rather than Limited, there are other various realization methods without departing from the spirit and scope of the present invention, and include by reference In this.

Then, the pre-scheduling message sending device of each base station is sent to other collaboration base stations comprising pre-scheduling user equipment Information and to the pre-scheduling user equipment downlink label pre-scheduling message.Preferably, only when selected by base station Pre-scheduling user equipment for collaboration multi-point joint transmission optional user equipment when, the pre-scheduling message of the base station sends dress It puts to other collaboration base stations and sends the pre-scheduling information；When the selected pre-scheduling user equipment in the base station is not that collaboration is more During the optional user equipment of point joint transmission, which carries out miscoordination by the user equipment of oneself is conventionally dispatched Multi-point joint transmission and be no longer participate in it is subsequent it is possible collaboration multi-point joint transmission scheduling and other operation；It is if each The pre-scheduling user equipment of base station is not the collaborative device of the optional user equipment, then each base station that cooperate with multi-point joint transmission Respectively downlink will be dispatched respectively carries out miscoordination multi-point joint transmission.Due to the collaborative device tune of each base station The technology for spending the downlink progress miscoordination multi-point joint transmission of oneself is well known to those skilled in the art, therefore herein not It is described in detail again.

Hereinafter, situation of the pre-scheduling user equipment for the optional user equipment of collaboration multi-point joint transmission will be illustrated.Under In text description, by taking the 1m of base station as an example, pre-scheduling user determined by the pre-scheduling user equipment determining device of wherein base station 1m is User equipment 2j belongs to user equipment collection M, to cooperate with the optional user equipment of multi-point joint transmission.The pre-scheduling of base station 1m Message sending device will send pre-scheduling information to other collaboration base stations, such asWherein, UE_jRepresent that this is presetting Degree user equipment is 2j,Represent base station 1m to the label of the downlink of the user's equipment 2j.Moreover it is preferred that The pre-scheduling user equipment determining device of base station can be that this pre-scheduling equipment determines precedence information.For example, according to difference System performance goals, the pre-scheduling user equipment determining device of base station can adjust this with certain strategy and algorithm The priority of pre-scheduling equipment.For example, base station 1m can use random number as the priority.In addition, dry to consider to reduce Disturb for target when, the pre-scheduling user equipment determining device of base station can be according to under selected pre-scheduling user equipment The label of line link obtains the degree of correlation information between the precoding vector of the downlink and the code book, and according to the degree of correlation Height sets its priority.If the degree of correlation is higher, pre-scheduling user equipment determining device then distributes higher priority；Such as The degree of correlation is relatively low, and pre-scheduling user equipment determining device then distributes relatively low priority.In a further embodiment, for example, During using acceptable service quality as target, the pre-scheduling user equipment determining device of base station 1m can also be used according to pre-scheduling The QoS of family equipment distributes its priority.The pre-scheduling message sending device of base station 1m can include the precedence information Other collaboration base stations are sent in the pre-scheduling information.It will be understood by those skilled in the art that described herein determine preferentially The method of grade information is descriptive and non-limiting, there is spirit of other various realization methods without departing from the present invention And scope, and be incorporated herein by reference.

In a further advantageous embodiment, the pre-scheduling message sending device of base station can also be by other relevant informations such as The RSRP of the pre-scheduling user equipment（Reference Signal Received Power, reference signal receiving intensity）, etc. Information is sent to other collaboration base stations.

Preferably, the pre-scheduling message sending device of base station can be cooperateed with by foregoing Multicast group address to others The base station of multi-point joint transmission sends the pre-scheduling message, and the pre-scheduling message sending device of base station can also pass through point pair The base station of point mode to other collaboration multi-point joint transmissions sends the message.It is it will be understood by those skilled in the art that described herein The mode that bright information is sent is descriptive and non-limiting, there are other various realization methods without departing from the present invention Spirit and scope, and be incorporated herein by reference.

The pre-scheduling message sending device of each base station in the LTE-A network comes to cooperate with to other in the same way Base station sends respective pre-scheduling information.

Then, the pre-scheduling message receiving apparatus of each base station in the LTE-A network is received from other collaboration base station hairs The pre-scheduling information sent.It knows since the technology of reception message is known to those skilled in the art, is no longer described in detail herein.

Then, the second candidate user determining device of each base station in the LTE-A network determines collaboration multi-point joint transmission Candidate user devices.In one embodiment, the second candidate user determining device of base station comes from other according to what is received The pre-scheduling information of the pre-scheduling message sending device of base station is cooperateed with, knows that the pre-scheduling user equipment of other collaboration base stations is true Determine the label of the selected pre-scheduling user equipment of device and corresponding downlink.Second candidate user of base station determines Device can according to certain strategy, such as according to indicated by label the degree of correlation height, under selecting the degree of correlation higher Candidate user devices of the pre-scheduling user equipment of line link as this collaboration multi-point joint transmission.Preferably, pre-scheduling is worked as The message that message receiving apparatus receives includes above-mentioned priority and/or RSRP when information, and the second candidate user of base station is true Determining device can be according to above-mentioned precedence information, to determine the candidate user devices of this collaboration multi-point joint transmission.For example, Second candidate user determining device selects the user equipment of highest priority to be used as the candidate of this collaboration multi-point joint transmission Family equipment.Second candidate user determining device of each base station makes choice according to identical strategy, therefore the second of each base station waits It selects family determining device that will select identical pre-scheduling user equipment and is used as this common time for cooperateing with multi-point joint transmission Select user equipment.It will be understood by those skilled in the art that the second candidate user determining device described herein be it is descriptive rather than Limited, there are other various realization methods without departing from the spirit and scope of the present invention, and include by reference In this.

The first candidate downlink determining device of the present invention is further described below.First candidate downlink is true Determining device is included for the label according to each downlink, and number of users can be matched to determine that maximum can match the maximum of number of users Determining device；And for according to each downlink label, it is identified collaboration multi-point joint transmission candidate user devices And the pre-scheduling user equipment of this base station, to determine under the second candidate of the candidate downlink of collaboration multi-point joint transmission Line link determining device.

Then, the second candidate downlink determining device of each base station is above-mentioned definite according to the label of each downlink The candidate user devices of multi-point joint transmission and the pre-scheduling user of this base station are cooperateed with, to determine that the collaboration multi-point joint passes Defeated candidate downlink.

It is assumed that the candidate user of collaboration multi-point joint transmission is set determined by foregoing second candidate user devices determining device Standby is user equipment 2i, belongs to user equipment collection M, the base station of serving cell is 1m.The collaboration base station of base station 1m is base station 1x With base station 1y.It is user wherein to cooperate with pre-scheduling user equipment determined by the pre-scheduling user equipment determining device of base station 1x Equipment 2j belongs to user equipment collection X, cooperates with pre-scheduling user determined by the pre-scheduling user equipment determining device of base station 1y Equipment is user equipment 2k, belongs to user equipment collection Y.

The second candidate downlink determining device of collaboration base station 1x comes from from what pre-scheduling message receiving apparatus was received The downlink of their pre-scheduling user equipment is got in the pre-scheduling message of base station 1m and base station 1y, including collaboration The label of the downlink of the candidate user devices 2i of multi-point joint transmission,According to the label, the second of base station 1x Candidate downlink determining device determine in the predetermined code book with the highest precoding vector of the downlink degree of correlation ForAlso, according to the label of each downlink, the second candidate downlink of base station 1x determines to fill The label for determining it to the downlink of user equipment 2i is put,According to the label, under the second candidate of base station 1x Line link determining device determine in the predetermined code book with the highest precoding vector of the downlink degree of correlation In addition, pre-scheduling user equipment namely user equipment 2j that base station 1x is determined to this base station, downlink The label of link isAccording to the label, the second candidate downlink determining device of base station 1x determines described make a reservation for It is with the highest precoding vector of the downlink degree of correlation in code book

Preferably, the second candidate downlink determining device of base station 1x is according to Zero Forcing, by comparingWith Whether it is same precoding vector to determine to whether there is stronger inter-user interference between user equipment 2j and user equipment 2i. If that is,WithIt differs, then means that stronger inter-user interference is not present in user equipment 2j and user equipment 2i, The collaborative device of base station 1x is by using the pre-scheduling user equipment 2j of oneself as this scheduled user equipment of oneself, together When will not participate in this collaboration multi-point joint transmission.

IfWithIdentical, the second candidate downlink determining device of base station 1x is to avoid making user equipment 2i Into interference, its identified pre-scheduling user equipment 2j will not be dispatched.In this case, second candidate's downlink of base station 1x Link determining device is right according to Zero ForcingWithIt is compared, ifWithIt is identical, then mean from base station 1x To user equipment 2i and between the downlink base station 1m to user equipment 2i there are stronger interference, so as to which base station 1x will It is not involved in this collaboration multi-point joint transmission.In this case, the collaborative device of base station 1x will be selected from user equipment collection X Meet Zero Forcing namely related with the user's equipment with user equipment 2i and with the pre-scheduling user equipment 2k of base station 1y Spend highest precoding vector withWithDifferent user equipment, to be scheduled, if there is no such user Equipment, the collaborative device of base station 1x will be abandoned this time from user equipment collection X namely the optional equipment collection of collaboration multi-point joint transmission Dispatcher meeting.

Such asWithIt differs, then means from base station 1x to user equipment 2i and from base station 1m to user equipment 2i Downlink between there is no stronger interference, then base station 1x can participate in the collaboration multi-point joint transmission to user equipment 2i. Whether the second candidate downlink determining device of base station 1x further detects the RSRP measured values of user equipment 2i higher than predetermined Threshold value, if above the threshold value, then the second candidate downlink determining device of base station 1x determines that it sets to user Candidate downlink of the downlink of standby 2i as this collaboration multi-point joint transmission.And if less than the threshold value, base The 1x that stands is not involved in this time collaboration multi-point joint transmission.The collaborative device of base station 1x will be according to the method described above from user equipment collection X Selection and user equipment 2i and meet Zero Forcing between the pre-scheduling user equipment 2k of base station 1y namely set with the user The standby highest precoding vector of the degree of correlation withWithDifferent user equipment, to be scheduled, if there is no so User equipment, the collaborative device of base station 1x will be abandoned this time from the optional of user equipment collection X namely collaboration multi-point joint transmission The dispatcher meeting of equipment collection.In addition, base station 1x can also select other users equipment from user equipment collection X ' and/or X It is used in conjunction with identical resource and carries out miscoordination multi-point joint transmission.Herein between these selected user equipmenies, with And interference coordination relation between user equipment as shown in Figure 5 c should be met between user equipment 2i and user equipment 2k, and And not more than maximum can match number of users.In addition, the measurement of correlation detection technique of the RSRP is those skilled in the art institute It is known, it is no longer described in detail herein.

After the same method, the second candidate downlink determining device of base station 1y can determine this time assisting for oneself With the candidate downlink of multi-point joint transmission.

It will be understood by those skilled in the art that the second candidate downlink determining device of collaboration base station is according to downlink The information such as label, can determine the candidate downlink of the collaboration multi-point joint transmission in various manners, and be not limited to herein The mode exemplarily illustrated.There are various other realization methods without departing from the spirit and scope of the present invention, and to quote Form be incorporated herein.

The second dispatching device hereinafter will be further illustrated, including for collaboration multi-point joint transmission user set The base station of standby serving cell sends the candidate downlink of the candidate downlink message of the label comprising candidate downlink Message sending device；For receiving the participation downlink included in candidate downlink of the base station from serving cell The participation down-link reception device of the participation downlinlc message of label；For when cooperateing with multi-point joint transmission, according to Downlinlc message is participated in, for the candidate user devices of the collaboration multi-point joint transmission, scheduling participates in the 3rd of downlink Dispatching device.

First, the candidate downlink message sending device of base station is cooperateed with to the candidate user of collaboration multi-point joint transmission Serving cell base station send comprising the candidate downlink label candidate downlink message.Example is connected, this The first candidate downlink determining device of place, collaboration base station 1x and collaboration base station 1y are determined respectively as user equipment 2i's Cooperate with the candidate downlink of multi-point joint transmission.Specifically, further illustrated exemplified by cooperateing with base station 1x.Preferably, The candidate downlink message sending device of collaboration base station 1x can be sent out to the base station 1m of the serving cell of candidate user devices 2i Send asMessage, whereinTo cooperate with the candidate downlink of base station 1x namely base station 1x to user The label of the downlink of equipment 2i.With same method, the candidate downlink message sending device of base station 1y is cooperateed with to base The 1m that stands sends the candidate downlink message for including its candidate downlink label.Preferably, cooperation district can also should The RSRP values of candidate downlink add in label to be sent.

Then, the participation down-link reception device of the base station of the serving cell of candidate user devices determines candidate user The participation downlink of the collaboration multi-point joint transmission of equipment.In a preferred embodiment, down-link reception device is participated in Including being used for the candidate user devices for its serving cell for the collaboration multi-point joint transmission of the cell of this base station, according to each The label of downlink and the candidate downlink message for including candidate downlink label of reception, to determine that candidate waits Select the participation downlink of user equipment volume collaboration multi-point joint transmission；And for cooperateing with base stations to one or more other Send the participation downlinlc message sending device of the participation downlinlc message comprising the label for participating in downlink.

Specifically, example is connected, the participation downlink determining device of base station 1m comes from collaboration base station 1x according to what is received With the candidate downlink message of collaboration base station 1y Know the time of base station 1x and base station 1y Downlink is selected to be respectively provided with labelWithAccording to different system performance goals, the participation downlink of base station 1m Link determining device can determine the participation downlink of this collaboration multi-point joint transmission using different strategies.One In a preferred embodiment, disturbed for considering to reduce, the participation downlink determining device of base station 1m can be determined from label The degree of correlation between the precoding vector of candidate downlink and the predetermined code book, and select the wherein higher candidate of the degree of correlation Participation downlink of the downlink as this collaboration multi-point joint transmission.Preferably, when containing the candidate in label During the RSRP value informations of downlink, the participation downlink determining device of base station 1m can also select the candidate with this base station The more similar candidate downlink of RSRP values of downlink；Or by the degree of correlation and RSRP values and candidate's downlink chain of this base station The phase recency weighting summation of the RSRP values on road, and the candidate downlink for selecting weights larger is as this collaboration multi-point joint The participation downlink of transmission.It will be understood by those skilled in the art that various realities can be used by participating in downlink determining device herein Existing mode determines the participation downlink of the collaboration multi-point joint transmission, and is not limited to the side that property illustrated herein illustrates Formula.There are various other realization methods without departing from the spirit and scope of the present invention, and it is incorporated herein by reference.

Then, the participation downlinlc message sending device of the base station of the serving cell of candidate user devices is assisted to other It is sent with base station comprising the participation downlinlc message for participating in downlink label.As previously described, it is assumed that under the participation of base station 1m Line link determining device selects the candidate downlink of collaboration base station 1x as participation downlink.The participation downlink of base station 1m Chain circuit message sending device will send the participation for including this collaboration multi-point joint transmission to collaboration base station 1x and collaboration base station 1y The message of downlink.The participation downlinlc message sending device of base station 1m can be disappeared by way of multicast to send this Breath is such as sent, such as by above-mentioned collaboration base station Multicast group addressMessage, wherein UE_iFor the candidate user devices 2i, PCI_m, PCI_xThe respectively Physical Cell Identifier of base station 1m and base station 1x（PCI, Physical Cell Identifier）,WithThe mark of the participation downlink of respectively base station 1m and base station 1x Label.Preferably, the participation downlinlc message sending device of base station 1m can also by other information, such as resource block location, MCS（Modulation and Coding Scheme, Modulation and Coding Scheme etc., which are added in label, to be sent.Base station 1m's The message can also be sent by point-to-point mode to base station 1x and base station 1y by participating in downlinlc message sending device. It will be understood by those skilled in the art that message can be sent in various manners herein, and it is not limited to property explanation illustrated herein Mode.There are various other realization methods without departing from the spirit and scope of the present invention, and it is contained in by reference This.

Then, respectively the down-link reception device that participates in of collaboration base station is received comprising the participation for participating in downlink label Downlinlc message.It knows since the technology of reception message is known to those skilled in the art, is no longer described in detail herein.

Then, respectively the 3rd dispatching device of collaboration base station when cooperateing with multi-point joint transmission, disappears according to downlink is participated in Breath, to cooperate with the candidate user of multi-point joint transmission, scheduling participates in downlink.Example is connected, cooperates with the participation downlink of base station 1x Link reception device receives messageThis base station will be known to user equipment 2i's Downlink is selected as participating in downlink, it is preferable that the participation down-link reception device of collaboration base station 1x can be with Know from participating in participating in the label of downlink included in downlinlc message such as message such as MCS, resource block locations, Then the 3rd dispatching device of base station 1x is cooperateed with to dispatch the downlink accordingly to carry out collaboration multi-point joint for user equipment 2i Transmission.And after the participation down-link reception device of base station 1y is cooperateed with to receive the message, it will be known to user equipment 2i's Downlink is not selected for participating in downlink, therefore cooperates with the collaborative device of base station 1y can be according to the above Method continues to select other user equipmenies to be scheduled and carry out miscoordination multi-point joint transmission.After the completion of scheduling It carries out subsequently cooperateing with the technology of multi-point joint transmission/miscoordination multi-point joint transmission is known to those skilled in the art to know, this Place is no longer described in detail.

In addition, in a preferred embodiment, when cooperateing with multi-point joint transmission, the first dispatching device of base station may be used also With the label according to downlink, the precoding weight for signal transmission of downlink is determined.Specifically, example is connected, with It is further illustrated exemplified by the 1m of base station.The first dispatching device of base station 1m is according to the label of the downlink of this base station It can determine and that highest precoding vector of the degree of correlation in the precoding vector of the downlink and the predetermined code book. In addition, as described above, the first dispatching device of base station 1md can also use identical resource while can to not more than maximum Match the other users device transmission signal of number of users.Similarly, the first dispatching device of base station 1m can arrive other using it The label of the downlink of user equipment obtains the downlink correspondingly precoding vector.Then, the first of base station 1m is adjusted Degree device can determine that it is used for the precoding weight of signal transmission according to these precoding vectors, and can be pre- according to this Code weight carries out precoding to signal to be transmitted.The method that precoding weight is determined herein according to precoding vector It is known to those skilled in the art to know, it is no longer described in detail herein.

It should be noted that the present invention can be carried out in the assembly of software and/or software and hardware, for example, can adopt Use application-specific integrated circuit（ASIC）, general purpose computer or any other realized similar to hardware device.In one embodiment In, software program of the invention can perform to realize steps described above or function by processor.Similarly, it is of the invention Software program（Including relevant data structure）It can be stored in computer readable recording medium storing program for performing, for example, RAM is stored Device, magnetic or optical driver or floppy disc and similar devices.In addition, hardware can be used in fact in some steps or function of the present invention It is existing, for example, as the circuit for coordinating to perform each step or function with processor.

In addition, the part of the present invention can be applied to computer program product, such as computer program instructions, when it When being computer-executed, by the operation of the computer, the method according to the invention and/or technical side can be called or provided Case.And call the present invention method program instruction, be possibly stored in fixed or moveable recording medium and/or By broadcast or other signal bearing medias in data flow instructed to be transmitted and/or be stored according to described program In the working storage of the computer equipment of operation.Here, include a device, the dress according to one embodiment of present invention The memory including being used to store computer program instructions and the processor for executing program instructions are put, wherein, when the calculating When machine program instruction is performed by the processor, side of the device operation based on foregoing multiple embodiments according to the present invention is triggered Method and/or technical solution.

It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned exemplary embodiment, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, nothing By from the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by institute Attached claim rather than above description limit, it is intended that will fall within the meaning and scope of the equivalent requirements of the claims All changes include within the present invention.Any reference numeral in claim should not be considered as to the involved right of limitation It is required that.Furthermore, it is to be understood that one word of " comprising " is not excluded for other units or step, odd number is not excluded for plural number.It is old in device claim The multiple devices stated can also be realized by a device by software or hardware.The first, the second grade words are used for representing name Claim, and do not represent any particular order.

Claims

1. a kind of method for being used to carry out collaboration multi-point joint transmission in the base station of LTE-A network, wherein in the LTE-A network Each base station include identical predetermined code book, this method comprises the following steps：

The channel information of each downlink of-acquisition；

- according to the channel information of each downlink, generate the label of each downlink, the label include it is described under Degree of correlation information between the precoding vector of line link and the code book and comprising between the code book and the downlink The highest precoding vector of the degree of correlation, wherein, the channel information according to each downlink generates each downlink chain The step of label on road, includes：

- according to the channel information of each downlink, determine each downlink and the code book precoding vector it Between the degree of correlation and the code book the highest precoding vector of the degree of correlation between the downlink；

- according to the degree of correlation and the highest precoding vector of the degree of correlation, the mark of generation each downlink Label；

- when cooperateing with multi-point joint transmission, according to the label of each downlink, to dispatch each downlink.

2. according to the method described in claim 1, wherein, the method further includes：

- according to the channel information of each downlink and/or the measurement result from each user equipment, determine that the collaboration is more The optional user equipment of point joint transmission；

- for the optional user equipment of the collaboration multi-point joint transmission, to for cooperateing with the one or more of multi-point joint transmission Other collaboration base stations send the request message for obtaining downlink channel information；

Wherein, each downlink includes the user equipment serviced to this base station and other collaboration base stations notify this base station The downlink of the optional user equipment of multi-point joint transmission is cooperateed with, wherein, notify the association of this base station for other collaboration base stations With the optional user equipment of multi-point joint transmission, it is described obtain each downlink channel information the step of include：

- receive from other collaboration base stations acquisition downlink channel information request message；

- get it is described collaboration multi-point joint transmission optional user equipment downlink channel information.

3. method according to any one of claim 1 to 2, wherein, it is described when cooperateing with multi-point joint transmission, according to institute The label of each downlink is stated, to dispatch each downlink the step of includes：

- according to the label of each downlink, it determines to cooperate with the candidate user devices of multi-point joint transmission；

- according to the label of each downlink and the candidate user devices of identified collaboration multi-point joint transmission, really The candidate downlink of the fixed collaboration multi-point joint transmission；

- when cooperateing with multi-point joint transmission, it is the collaboration multi-point joint transmission according to the label of each downlink Candidate user devices, dispatch the candidate downlink.

4. according to the method described in claim 3, wherein, the label according to each downlink determines collaboration The step of candidate user devices of multi-point joint transmission, includes：

- according to the label of each downlink, determine the pre-scheduling user equipment that this base station services；

- sent to other collaboration base stations comprising the pre-scheduling user equipment information and the downlink to the pre-scheduling user equipment The pre-scheduling message of the label of link；

- receive from other collaboration base stations comprising pre-scheduling user equipment information and the downlink to the pre-scheduling user equipment The pre-scheduling message of the label of link；

- according to identified pre-scheduling user equipment, the received pre-scheduling message from other collaboration base stations, Yi Jisuo The label of each downlink is stated, determines a candidate user devices of collaboration multi-point joint transmission.

5. it is described when cooperateing with multi-point joint transmission according to the method described in claim 3, wherein, according to each downlink chain The step of label on road is the candidate user devices of the collaboration multi-point joint transmission, dispatches the candidate downlink Including：

- sent to the base station of the serving cell of the candidate user devices of the collaboration multi-point joint transmission comprising candidate's downlink The candidate downlink message of the label of link；

- receive the label comprising the participation downlink in the candidate downlink from the base station of the serving cell with And the participation downlinlc message of relevant channel information；

- when cooperateing with multi-point joint transmission, according to the participation downlinlc message, for the time of the collaboration multi-point joint transmission User equipment is selected, dispatches the participation downlink.

6. a kind of device for being used to carry out collaboration multi-point joint transmission in the base station of LTE-A network, wherein in the LTE-A network Each base station include identical predetermined code book, which includes：

- tag device, for the channel information according to each downlink, the label of generation each downlink, institute State label include degree of correlation information between the precoding vector of the downlink and the code book and comprising the code book with The highest precoding vector of the degree of correlation between the downlink, wherein, the device that tags includes：

Degree of correlation determining device, for the channel information according to each downlink, determine each downlink with it is described The degree of correlation between the downlink of the degree of correlation and the code book between the precoding vector of code book is highest to prelist Code vector；

Label generating means, for according to the degree of correlation and the highest precoding vector of the degree of correlation, generating described each The label of downlink；

- the first dispatching device, for when cooperateing with multi-point joint transmission, according to the label of each downlink, to adjust Spend each downlink.

7. device according to claim 6, wherein, described device further includes：

Optional user equipment determining device, for the channel information according to each downlink and/or from each user The measurement result of equipment determines the optional user equipment of the collaboration multi-point joint transmission；

Request message sending device, for the optional user equipment for the collaboration multi-point joint transmission, to for cooperateing with multiple spot Other one or more collaboration base stations of joint transmission send the request message for obtaining downlink channel information；

Wherein, each downlink includes the user equipment serviced to this base station and other collaboration base stations notify this base station The downlink of the optional user equipment of multi-point joint transmission is cooperateed with, wherein, notify the association of this base station for other collaboration base stations With the optional user equipment of multi-point joint transmission, first acquisition device includes：

Solicited message reception device, the request for receiving the acquisition downlink channel information from other collaboration base stations disappear Breath；

Second acquisition device, for getting the channel of the downlink of the optional user equipment of the collaboration multi-point joint transmission Information.

8. device according to claim 7, wherein, the optional user equipment determining device further includes：

Base station determining device is cooperateed with, for the channel information according to each downlink and/or from each user equipment Measurement result, to determine the devices of one or more collaboration base stations of collaboration multi-point joint transmission.

9. the device according to any one of claim 6 to 8, wherein, first dispatching device includes：

First candidate user devices determining device for the label according to each downlink, determines collaboration multiple spot connection Close the candidate user devices of transmission；

First candidate downlink determining device is more for the label according to each downlink and identified collaboration The candidate user devices of point joint transmission determine the candidate downlink of the collaboration multi-point joint transmission；

Second dispatching device, for being described according to the label of each downlink when cooperateing with multi-point joint transmission The candidate user devices of multi-point joint transmission are cooperateed with, dispatch the candidate downlink.

10. device according to claim 9, wherein, the first candidate user devices determining device includes：

Pre-scheduling user equipment determining device for the label according to each downlink, determines the service of this base station Pre-scheduling user equipment；

Pre-scheduling message sending device, for sending comprising the pre-scheduling user equipment information and arriving to other collaboration base stations The pre-scheduling message of the label of the downlink of the pre-scheduling user equipment；

Pre-scheduling message receiving apparatus comprising pre-scheduling user equipment information and arrives for reception from other collaboration base stations The pre-scheduling message of the label of the downlink of the pre-scheduling user equipment；

Second candidate user devices determining device, for according to identified pre-scheduling user equipment, received come from it He cooperates with the pre-scheduling message of base station and the label of each downlink, determines one of collaboration multi-point joint transmission Candidate user devices.

11. according to the device described in claim 10, wherein, the first candidate downlink determining device includes：

Second candidate downlink determining device, for according to each downlink the label, identified collaboration it is more The candidate user devices of point joint transmission and the pre-scheduling user equipment of this base station, to determine the collaboration multi-point joint The candidate downlink of transmission.

12. device according to claim 10, wherein, second dispatching device includes：

Candidate downlink message sending device, for small to the service of the candidate user devices of the collaboration multi-point joint transmission The base station in area sends the candidate downlink message of the label comprising the candidate downlink；

Down-link reception device is participated in, the candidate downlink is included from the base station of the serving cell for receiving In participation downlink label participation downlinlc message；

3rd dispatching device, for being the collaboration according to the participation downlinlc message when cooperateing with multi-point joint transmission The candidate user devices of multi-point joint transmission dispatch the participation downlink.

13. device according to claim 12, wherein, the participation down-link reception device further includes：

Downlink determining device is participated in, is used for, is the collaboration multi-point joint of the cell of this base station for its serving cell The candidate user devices of transmission include the candidate downlink label according to the label of each downlink and reception The candidate downlink message, to determine the participation downlink chain of the collaboration multi-point joint transmission of the candidate user devices Road；

Downlinlc message sending device is participated in, for being sent to other one or more of collaboration base stations comprising the participation The participation downlinlc message of the label of downlink.

14. device according to claim 6, wherein, first dispatching device further includes：

Precoding weight determining device for the label according to the downlink, determines being used for for the downlink The precoding weight of signal transmission；

Pre-coding apparatus, for according to identified precoding weight, being carried out to the signal to be transmitted on the downlink Precoding.

15. the device according to any one of claim 6 to 8, wherein, which further includes：

Maximum can match number of users determining device, for the label according to each downlink, to determine that maximum can match somebody with somebody To number of users.