CN101741439B - Coordinated multi-point transmission method - Google Patents

Abstract

The invention provides a coordinated multi-point transmission method. The method comprises the step of: transmitting each path of data, which is acquired from data to be transmitted after multi-antenna processing, through different nodes or node groups respectively. After the method is adopted, on the one hand, an LTE R8 user can work in a CoMP mode of LTE-A to acquire a macro diversity processing gain and reduce interference among cells, and on the other hand, the power is concentrated at the position of UE by adjusting the transmission direction of a signal through different coordinated nodes so as to acquire a beamforming processing gain.

Description

A kind of coordinated multi-point transmission method

Technical field

This paper has related to wireless communication technology, relates in particular to the method for coordinated multipoint transmission in a kind of LTE_A system.

Background technology

Along with the proposition of LTE_A (LTE-Advance, further Long Term Evolution) demand, people more and more pay attention to residential quarter average spectral efficiency (ase) and cell edge spectrum efficiency.comparatively speaking, the spectrum efficiency of cell edge is paid close attention to by people most, this is mainly because the provisional capital up and down of LTE_A system is with OFDM (Orthogonal Frequency Division Multiplexing, OFDM) be the frequency division systems of basic multiple access multiplexing mode, with traditional with CDMA (Code-Division Multiple Access, the code division multiple access access) be the wireless communication system difference of basic multiple access multiplexing mode, the LTE_A system does not have processing gain, the residential quarter is inner because complete frequency division quadrature, so almost there is no interference problem, but the interference at the cell edge place is processed relatively thorny.

At present in LTE, the processing method to cell edge place interference problem mainly contains following three kinds: 1, interference randomization; 2, disturb elimination; 3, interference coordination (hiding).In these three kinds are disturbed processing method, or interference can't be effectively eliminated, or resource can't be utilized fully.Therefore utilize the transmitting antenna cooperation transmission of a plurality of residential quarters to realize that higher capacity and the transmitting of cell edge place Radio Link just become research emphasis, this is the coordinated multipoint transmission technology namely.The basic principle of coordinated multipoint transmission as shown in Figure 1, wherein, #1 residential quarter and #3 residential quarter are respectively UE (subscriber equipment) 2 and UE3 service, #1 residential quarter, #2 residential quarter and #3 are community associated for being in the UE1 service of three cell edges.

In the 53bis meeting, agreed " Coordinated multiple point transmission andreception (coordinated multipoint transmission and reception) " chapters and sections are added in basic framework.54 and the 54bis meeting in, a series of multipoint cooperative delivery plan has been proposed.In these schemes, all there is no consideration to the support issue of LTER8 terminal.Vodafone (Waduven) is when considering CoMP, talk about the problem that the UE in LTE R8 should coexist with the user of support CoMP (Coordinate Multiple Point transmition andreception, coordinated multipoint transmission) in same residential quarter.In relevant document, the aspect that never affects air interface standard has been studied as supporting CoMP technology, the mapping method problem of antenna port.Also there is document to propose to distribute the thought of special-purpose cooperation resource-area from the angle of avoiding pilot tone impact in residential quarter specific (cell-specific) between neighbor cell.

Suppose can obtain under the prerequisite of channel condition information of all residential quarters at receiving-transmitting sides, the ideal model that receives signal is:

$y=\left[\begin{array}{ccc}\sqrt{P_1}{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">H</figure-callout>}}_1& \&CenterDot;\&CenterDot;\&CenterDot;& \sqrt{P_N}{H}_N\end{array}\right]\left[\begin{array}{c}{W}_1\\ {\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">W</figure-callout>}}_2\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ W_N\end{array}\right]s+n=\mathrm{HWs}+n$

Wherein, P _nBe the power back-off factor of n cooperation cell, H _nBe the N of n cooperation cell and terminal room _r* N _{T, n}The dimension channel matrix, W _nBe the N of precoding weights corresponding to n residential quarter _{T, n}* L ties up matrix, N _{T, n}Be the transmitting terminal number of antennas of n cooperation cell, N _rBe the terminal antenna number, 1≤n≤N, N are total number of cooperation cell and Serving cell, and L is the channel layer number, and s is for transmitting, and n is noise.Obviously, the CoMP system according to this model is set up needs the problem that solves below existence:

(1) design of pilot tone need to be considered the quadrature problem of each cooperation cell, so pilot-frequency expense needs assessment;

(2) because terminal needs respectively each cooperation cell to be carried out channel estimating, therefore can bring the problem of terminal receiver design complexities;

(3) with the compatibility issue of LTE R8: in LTE R8, the pilot tone of cell-specific is quadrature at neighbor cell, therefore each cooperation cell need to be avoided pilot frequency locations separately when carrying out the mapping of subcarrier, terminal need to be completed according to the ID of each cooperative node when carrying out subcarrier mapping and channel estimating.Therefore, the pattern of CoMP can't be supported the user of LTE R8 (LTE Release8, LTE version 8);

(4) computational problem of feedback overhead and feedback weight: terminal need to be respectively each cooperation cell and calculate weights, and feeds back, and the feedback overhead amount will be with the quantity of cooperation cell ratio to be increased.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of coordinated multi-point transmission method, with the user of compatible LTE R8.

For addressing the above problem, the invention provides a kind of coordinated multi-point transmission method, comprising:

Treating each circuit-switched data that transmitting data obtains after too much antenna processing is transmitted by different nodes or node group respectively.

Further, above-mentioned transmission method also can have following characteristics:

The above-mentioned transmitting data for the treatment of carries out many antenna processing and comprises: after control unit or service node sent to each cooperative node with above-mentioned data to be launched, each node carried out respectively many antenna processing; After perhaps by control unit or service node, above-mentioned data to be launched being carried out many antenna processing, the data after processing are sent to each node.

Further, above-mentioned transmission method also can have following characteristics:

Different nodes or node group the transmission of data comprise: above-mentioned service node and each cooperative node form according to predetermined wave beam and transmit after vector is processed this node circuit-switched data to be sent separately again.

Further, above-mentioned transmission method also can have following characteristics:

Above-mentioned control unit or service node specify above-mentioned each node or node group to send a certain circuit-switched data by control signal; Or above-mentioned each node and node group voluntarily calculative determination send a certain circuit-switched data.

Further, above-mentioned transmission method also can have following characteristics:

Above-mentioned service node and above-mentioned each cooperative node are by knowing that from the control signal of above-mentioned control unit or service node acquisition or the mode of self calculating the wave beam of the above-mentioned data of emission forms vector.

Further, above-mentioned transmission method also can have following characteristics:

It is with respect to the location positioning or that determine according to the measurement of upward signal of present node or determine according to the channel information of UE feedback according to terminal that above-mentioned wave beam forms vector.

Further, above-mentioned transmission method also can have following characteristics:

During more than or equal to the coordinated multipoint transmission port number, with service node and cooperative node grouping, grouping number is identical with above-mentioned coordinated multipoint transmission port number when above-mentioned cooperative node and service node total number; When cooperative node and service node total number during less than the coordinated multipoint transmission port number, the antenna of service node and cooperative node is divided into groups, grouping number is identical with above-mentioned coordinated multipoint transmission port number.

Further, above-mentioned transmission method also can have following characteristics:

Above-mentionedly above-mentioned data to be launched are carried out many antenna processing specifically comprise: above-mentioned data to be launched are carried out the processing of Space Frequency Block Coding diversity, Space Frequency Block Coding and frequency switched diversity are processed or circulation delay is processed.

Further, above-mentioned transmission method also can have following characteristics:

Above-mentionedly above-mentioned data to be launched are carried out many antenna processing specifically comprise: above-mentioned data to be launched are carried out precoding; Respectively when each node is completed, corresponding precoding weights obtain by the control signal of control unit or Serving cell when precoding.

Further, above-mentioned transmission method also can have following characteristics:

Above-mentioned node comprises residential quarter, base station, relay station or Remote Radio Unit.

Adopt the present invention, on the one hand the user of LTE R8 can be worked under the CoMP of LTE_A pattern, obtain grand diversity processing gain, reduce ICI (Inter-Cell Interference, presence of intercell interference).On the other hand, adjust the transmit direction of signal by different cooperative nodes, can make power concentration in the residing position of UE, thereby obtain wave beam inborn nature processing gain.

Description of drawings

Fig. 1 is the basic principle schematic of CoMP in prior art;

Fig. 2 is coordinated multipoint transmission transmit diversity theory diagram during two antenna ports in the embodiment of the present invention;

Fig. 3 is the coordinated multipoint transmission transmit diversity principle schematic when in the embodiment of the present invention, cooperative node and service node total number are more than or equal to service node antenna port number during four antenna ports;

Fig. 4 is the coordinated multipoint transmission transmit diversity principle schematic when in the embodiment of the present invention, cooperative node and service node total number are less than service node antenna port number during four antenna ports;

Fig. 5 adopts method for precoding to carry out coordinated multipoint transmission transmit diversity principle schematic in the embodiment of the present invention;

Fig. 6 is that in the embodiment of the present invention, the another kind of method for precoding that adopts carries out coordinated multipoint transmission transmit diversity principle schematic;

Fig. 7 adopts method for precoding to carry out the flow chart of coordinated multipoint transmission transmit diversity in the embodiment of the present invention;

Fig. 8 is the another kind of flow chart that adopts method for precoding to carry out the coordinated multipoint transmission transmit diversity in the embodiment of the present invention.

Embodiment

Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.

For convenience, below will be the user who is served by multi-node collaboration referred to as first kind user, by the user of single node service referred to as the Equations of The Second Kind user, with the register node at first kind user place referred to as service node, referred to as cooperative node, transmit port refers to transmit a plurality of antennas or the node of same road signal with the node that participates in cooperation.Node can but be not limited to and be residential quarter, base station, relay station or Remote Radio Unit.

Basic thought of the present invention is: treat each circuit-switched data that transmitting data obtains after too much antenna processing, transmitted by different nodes or node group respectively.

Wherein, each node comprises service node and cooperative node, and each node or node group are responsible for the transmission of one line data.Treating transmitting data carries out many antenna processing and comprise: after control unit or service node should data to be launched send to each cooperative node, each node carried out respectively many antenna processing; After perhaps by control unit or service node, these data to be launched being carried out many antenna processing, the data after processing are sent to each node.After each node utilizes wave beam formation vector corresponding to this node to be weighted processing to this node circuit-switched data waiting for transmission, formation has one road signal of directivity, this wave beam forms vector and can obtain by the control signal that reception control unit or service node are sent, and perhaps this node calculates and obtains.If precoding is completed at each node, the precoding weights are notified each node by control unit or Serving cell.After many antenna processing of each cooperative node transmission, a certain circuit-switched data can be notified each node or each cooperative node to calculate according to preassigned pattern voluntarily by control unit or service node and obtain (as to residential quarter ID delivery).During more than or equal to the CoMP port number, with service node and cooperative node grouping, make the group number identical with the CoMP port number when cooperative node and service node total number.When cooperative node and service node total number during less than the CoMP port number, the antenna of service node and cooperative node is divided into groups, make the group number identical with the CoMP port number.

According to foregoing description, concrete implementation step can for:

Step 1: service node and cooperative node obtain respectively to treat the data after transmitting data carries out many antenna processing;

Step 2: the control signal that each node or node group are sent according to the control unit that receives, the specified circuit-switched data after many antenna processing of control channel respectively;

Step 3: each node or node group form vector with wave beam this node or the armed circuit-switched data of this node group and pilot tone in the cooperation resource are weighted, and the data in this resource are launched according to the direction of appointment.

The below is described further the present invention with several application examples of the present invention.

Application example 1: the diversity transmitting method when multicast communication depends on two transmit pories.

As shown in Figure 2, after control unit or Serving cell send to each node with the data to be launched of this Serving cell, service node and each cooperative node are indicated according to control information, carry out chnnel coding modulation and SFBC (Space Frequency Block Coding, Space Frequency Block Coding) diversity is processed, and the data after processing through diversity can be expressed as: $\left[\begin{array}{ccc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}\&CenterDot;\&CenterDot;\&CenterDot;s_{n-1}& -s_n^{*}\\ s_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}\&CenterDot;\&CenterDot;\&CenterDot;s_n& s_{n-1}^{*}\end{array}\right]$ 。After each node will be mapped to through the circuit-switched data that classification is processed respectively on each port of corresponding with service node, then form vector with wave beam and be weighted and launch.In Fig. 2, service node is used for the first via data after transmission is encoded through SFBC, and it forms vector B with wave beam _srTreat transmitting data and carry out beam weighting.It is with respect to the location positioning or that determine according to the measurement of upward signal of present node or determine according to the channel information of UE feedback according to terminal that this wave beam forms vector.Signal after processing through weighting can be expressed as:

$y_{\mathrm{sr}}={\mathrm{<figure-callout\; id="1"\; label="B\; sr\; s"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">B</figure-callout>}}_{\mathrm{sr}}{s}_{}{}_1=\left[\begin{array}{c}{B}_{\mathrm{sr}}^{\left(0\right)}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ B_{\mathrm{sr}}^{(p_{\mathrm{ser}}-1)}\end{array}\right]\left[\begin{array}{ccc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}\&CenterDot;\&CenterDot;\&CenterDot;s_{n-1}& -s_n^{*}\end{array}\right]$

Wherein, p _serBe current service node antenna number;

The wave beam that represents m root service node antenna forms vector, 0≤m≤p _ser-1.

Cooperative node is used for the second road signal of transmission after the SFBC coding, and it forms vector B with wave beam _coTreat transmitting data and carry out beam weighting.After processing through weighting, the signal of i cooperative node can be expressed as:

$y_{\mathrm{co}}^i=B_{\mathrm{co}}^i{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_2=\left[\begin{array}{c}{B}_{\mathrm{co}}^{(i\_0)}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ B_{\mathrm{co}}^{(i\_p_{\mathrm{co}}-1)}\end{array}\right]\left[\begin{array}{ccc}{s}_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}\&CenterDot;\&CenterDot;\&CenterDot;s_n& s_{n-1}^{*}\end{array}\right]$

Wherein, p _coAntenna number for current cooperative node;

The wave beam that represents i root cooperative node antenna forms vector.

In addition, in order to reduce between different nodes or the signaling consumption between each node and control unit, can according to the mode of acquiescence, in the circuit-switched data of service node transmission through the diversity processing, and all transmit an other circuit-switched data on other all cooperative nodes.

Can be found out by above-mentioned explanation, each circuit-switched data is put into the different districts transmission, after utilizing Beamforming (wave beam formation) technology, although all there are many antennas each residential quarter, but each residential quarter only has an antenna concerning UE, therefore only need to carry out channel estimating according to 1 antenna, thereby reduce design complexities and the feedback overhead of UE.

Application example 2: when multicast communication depends on 4 transmit pories, and the diversity transmitting method of the total number of cooperative node and service node during more than or equal to the transmit port number.

As shown in Figure 3, the scene of the total number that has provided cooperative node and service node during greater than Serving cell node antenna port CoMP transmit port number.First service node and cooperative node are divided into groups, make the group number identical with service node antenna port number.Then control unit or service node send to each cooperative node with the data to be sent of this service node, each node (comprising each cooperative node and service node) carries out respectively chnnel coding, modulation and SFBC+FSTD (Space Frequency Block Coding+Frequency switch transmit diversity, Space Frequency Block Coding+frequency switched diversity) (in actual use, concrete which kind of mode of employing is carried out diversity and is processed by high level definite according to channel condition) the diversity processing, can be expressed as through the data after the diversity processing:

$\left[\begin{array}{cccc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}& 0& 0\&CenterDot;\&CenterDot;\&CenterDot;\\ s_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& 0& 0\&CenterDot;\&CenterDot;\&CenterDot;\\ 0& 0& s_3& -s_4^{*}\&CenterDot;\&CenterDot;\&CenterDot;\\ 0& 0& s_4& {\mathrm{<figure-callout\; id="3"\; label="s"\; filenames="H2008101754782E00021.png,H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_3^{*}\&CenterDot;\&CenterDot;\&CenterDot;\end{array}\right]$

Each node forms vector to the wherein circuit-switched data in following formula with wave beam respectively and is weighted.In figure, suppose that first via data in first transmit port (being transmit port 0) transmission, are weighted this circuit-switched data with weights corresponding to cooperative node in service node and this group simultaneously, obtain:

$y_{\#0}^i=B_{\#0}^i{s}_1=\left[\begin{array}{c}{B}_{\#0}^{(i\_0)}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ B_{\#0}^{(i\_p_{\#0}-1)}\end{array}\right]\left[\begin{array}{cccc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}& 0& 0\&CenterDot;\&CenterDot;\&CenterDot;\end{array}\right]$

Wherein, p _#0Antenna number for the current service node;

The wave beam that represents i root service node antenna forms vector.

Similarly, the data format that is mapped on transmit port 1,2 and 3 of i cooperative node is respectively:

$y_{\#1}^i=B_{\#1}^i{s}_2=\left[\begin{array}{c}{B}_{\#1}^{(i\_0)}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ B_{\#1}^{(i\_p_{\#1}-1)}\end{array}\right]\left[\begin{array}{cccc}{s}_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& 0& 0\&CenterDot;\&CenterDot;\&CenterDot;\end{array}\right]$

$y_{\#2}^i=B_{\#2}^i{s}_3=\left[\begin{array}{c}{B}_{\#2}^{(i\_0)}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ B_{\#2}^{(i\_p_{\#2}-1)}\end{array}\right]\left[\begin{array}{cccc}0& 0& s_3& -s_4^{*}\&CenterDot;\&CenterDot;\&CenterDot;\end{array}\right]$

$y_{\#3}^i=B_{\#2}^i{s}_4=\left[\begin{array}{c}{B}_{\#3}^{(i\_0)}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ B_{\#3}^{(i\_p_{\#3}-1)}\end{array}\right]\left[\begin{array}{cccc}0& 0& s_4& {\mathrm{<figure-callout\; id="3"\; label="s"\; filenames="H2008101754782E00021.png,H2008101754782E00022.png"\; state="\{\{state\}\}">s</figure-callout>}}_3^{*}\&CenterDot;\&CenterDot;\&CenterDot;\end{array}\right]$

Wherein, p _#1, p _#2, p _#3Be respectively cooperative node 1,2,3 antenna number;

And

The wave beam that represents respectively i root antenna in cooperative node 1,2,3 forms vector.

Application example 3: when multicast communication depends on 4 transmit pories, and the diversity transmitting method of the sum of cooperative node and service node during less than CoMP transmit port number.

As shown in Figure 4, the cooperative node number is 2, the antenna with service node is divided into two groups, correspond to respectively transmit port 0 and 1, the antenna difference packet map of cooperative node #1 and cooperative node #2 is arrived corresponding transmit port 2 and 3, and data send transmission the 1st, 2 circuit-switched data at service node after each node carries out the processing of SFBC+FSTD diversity, send respectively the 3rd, 4 circuit-switched data at cooperative node #1 and cooperative node #2, and form vector weighting with wave beam respectively.

Application example 4:

A kind of pre-coding scheme specific implementation method corresponding to the present invention as shown in Figure 5, concrete steps comprise:

Step 1: different cooperative nodes obtains respectively the data through corresponding a certain transmit port after the precoding weight-codings.Be specially: the service node data that this service node is to be sent at control unit or UE place send to different cooperative nodes, by each cooperative node, above-mentioned data are carried out precoding, and obtain a circuit-switched data corresponding to this cooperative node.

Step 2: each cooperative node and service node form vector with separately wave beam respectively the data of this node corresponding ports are weighted, thereby data are sent on the direction at terminal place.Wave beam forms the configuration that vector can be semi-static according to choosing of cooperative node (second more than level).When being weighted with wave beam formation vector, need be weighted together data and pilot tone, the reception signal that terminal obtains is:

$y=\left[\begin{array}{ccc}\sqrt{P_1}{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">H</figure-callout>}}_1^{\&prime;}& \&CenterDot;\&CenterDot;\&CenterDot;& \sqrt{P_N}{H}_N^{\&prime;}\end{array}\right]\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">W</figure-callout>}}_1^{\&prime;}\\ {\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="H2008101754782E00022.png"\; state="\{\{state\}\}">W</figure-callout>}}_2^{\&prime;}\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ W_N^{\&prime;}\end{array}\right]s+n=\mathrm{HWs}+n$

Wherein, $H_n^{\&prime;}=H_n{B}_n$ The N of n the cooperative node that records for UE _r* 1 dimension channel matrix, H _nBe the N of n cooperative node and terminal room _r* N _{T, n}The dimension channel matrix, B _nBe N _{T, n}* 1 dimension wave beam forms vector,

Be 1 * L dimension pre-coding matrix, s is that the matrix that transmits is tieed up in L * 1, and n is N _r* 1 dimension noise vector; 1≤n≤N, N _rBe the number of terminal reception antenna, N _{T, n}Be n cooperative node transmitting terminal number of antennas, L is the number of layers of equivalent channel H, and N represents the number of cooperative node.

Having provided transmit port number corresponding to CoMP in Fig. 5 is the principle schematic of a kind of this embodiment of precoding structural correspondence of 2 o'clock.The #1 of residential quarter group and the residential quarter #2 of group carry out precoding processing according to the precoding weights to data corresponding to this port respectively, and form wave beam with wave beam formation vector on the direction of UE.In figure, the hypothesis pre-coding matrix is: $W=\left[\begin{array}{c}{w}_{11},w_{12}\\ w_{21},w_{22}\end{array}\right],$ The residential quarter #1 of group and the residential quarter #2 of group use respectively precoding weights W ₁=[w ₁₁, w ₁₂] and W ₂=[w ₂₁, w ₂₂] to signal [s ₁, s ₂] carry out precoding, and use the Beamforming vector $B_{\#1}^i=\left[\begin{array}{c}{b}_{\#1}^{i\_0}\\ b_{\#1}^{i\_1}\end{array}\right]$ With $B_{\#2}^i=\left[\begin{array}{c}{b}_{\#2}^{i\_0}\\ b_{\#2}^{i\_1}\end{array}\right]$ Precoding output data are weighted.Under this pattern, every group of cooperative node that terminal is seen is equivalent to a transmit port in CoMP.

All cooperative nodes and service node have consisted of the transmit port of CoMP together.

Application example 5:

Another kind of precoding specific implementation method corresponding to the present invention as shown in Figure 6, concrete steps comprise:

Step 1: different cooperative nodes transmits respectively with the data after identical precoding weights weighting.Be specially: the service node at control unit or UE place sends to each cooperative node with this service node data to be sent; Service node and each cooperative node carry out precoding with identical pre-coding matrix to above-mentioned data to be sent respectively, and will carry out the antenna mapping transmission according to the mode identical with service node through the data that precoding obtains.The signal that terminal receives is:

$y=\left[\begin{array}{ccc}\sqrt{P_1}{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="H2008101754782E00021.png"\; state="\{\{state\}\}">H</figure-callout>}}_1& \&CenterDot;\&CenterDot;\&CenterDot;& \sqrt{P_N}{H}_N\end{array}\right]\mathrm{Ws}+n=\mathrm{HWs}+n$

Namely the channel of all cooperative nodes and service node is superimposed as the channel H of an equivalence at the receiver place, and the terminal channel matrix H equivalent according to this calculated precoding weighted vector W.In above-mentioned formula, H _nBe N _r* N _{T, n}The dimension matrix, W is N _{T, n}* L n dimensional vector n, s are that the matrix that transmits is tieed up in L * 1, and n is N _r* 1 dimension noise vector; N _rBe the number of terminal reception antenna, N _{T, n}For participating in n node transmitting terminal number of antennas of cooperation, L is the number of layers of equivalent channel H, 1≤n≤N.

Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (8)

1. a coordinated multi-point transmission method, is characterized in that,

Treat each circuit-switched data that transmitting data obtains and transmitted by different nodes or node group respectively after too much antenna processing, described node comprises residential quarter, base station, relay station or Remote Radio Unit; Each node comprises service node and cooperative node, and each node or node group are responsible for the transmission of one line data; The described transmitting data for the treatment of carries out many antenna processing and comprises: after control unit or service node sent to each cooperative node with described data to be launched, each node carried out respectively many antenna processing; After perhaps by control unit or service node, described data to be launched being carried out many antenna processing, the data after processing are sent to each node.

2. transmission method as claimed in claim 1, is characterized in that,

Different nodes or node group the transmission of data comprise: described service node and each cooperative node form according to predetermined wave beam and transmit after vector is processed this node circuit-switched data to be sent separately again.

3. transmission method as claimed in claim 1, is characterized in that,

Described control unit or service node specify described each node or node group to send a certain circuit-switched data by control signal; Or described each node and node group voluntarily calculative determination send a certain circuit-switched data.

4. transmission method as claimed in claim 2, is characterized in that,

Described service node and described each cooperative node are by knowing that from the control signal of described control unit or service node acquisition or the mode of self calculating the wave beam of the described data of emission forms vector.

5. transmission method as claimed in claim 4, is characterized in that,

It is with respect to the location positioning or that determine according to the measurement of upward signal of present node or determine according to the channel information of UE feedback according to terminal that described wave beam forms vector.

6. transmission method as described in any one in claim 1～5, is characterized in that,

During more than or equal to the coordinated multipoint transmission port number, with service node and cooperative node grouping, grouping number is identical with described coordinated multipoint transmission port number when described cooperative node and service node total number; When cooperative node and service node total number during less than the coordinated multipoint transmission port number, the antenna of service node and cooperative node is divided into groups, grouping number is identical with described coordinated multipoint transmission port number.

7. transmission method as claimed in claim 1, is characterized in that,

Describedly described data to be launched are carried out many antenna processing specifically comprise: described data to be launched are carried out the processing of Space Frequency Block Coding diversity, Space Frequency Block Coding and frequency switched diversity are processed or circulation delay is processed.

8. transmission method as claimed in claim 1, is characterized in that,

Describedly described data to be launched are carried out many antenna processing specifically comprise: described data to be launched are carried out precoding; Respectively when each node is completed, corresponding precoding weights obtain by the control signal of control unit or Serving cell when precoding.

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