CN101741439A - 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 multipoint cooperative 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 sub-district 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 mainly is because the provisional capital up and down of LTE_A system is with OFDM (Orthogonal Frequency Division Multiplexing, OFDM) is the frequency division systems of basic multiple access multiplexing mode, with traditional with CDMA (Code-Division Multiple Access, code division multiple access inserts) be the wireless communication system difference of basic multiple access multiplexing mode, the LTE_A system does not have processing gain, the sub-district is inner because complete frequency division quadrature, so almost do not have interference problem, but handle thorny relatively in the interference at cell edge place.

The processing method to cell edge place interference problem mainly contains following three kinds among the LTE at present: 1, interference randomization; 2, interference eliminated; 3, interference coordination (hiding).Disturb in the processing method at these three kinds, or can't effectively eliminate interference, or can't utilize resource fully.Therefore utilize the transmitting antenna cooperation transmission of a plurality of sub-districts to realize that the higher capacity of cell edge place Radio Link and reliable transmission just become research emphasis, this is the multipoint cooperative transmission technology just.The basic principle of multipoint cooperative transmission as shown in Figure 1, wherein, #1 sub-district and #3 sub-district are respectively UE (subscriber equipment) 2 and UE3 service, #1 sub-district, #2 sub-district 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 (multipoint cooperative transmission and reception) " chapters and sections are added in the basic framework.54 and the 54bis meeting in, a series of multipoint cooperative delivery plan has been proposed.In these schemes, all there be not the support issue of consideration to the LTER8 terminal.Vodafone (Waduven) is when considering CoMP, talk about the problem that the UE among the LTE R8 should coexist with the user of support CoMP (Coordinate Multiple Point transmition andreception, multipoint cooperative transmission) in same sub-district.In relevant document, the aspect that has never influenced air interface standard has been studied to 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 influence in sub-district specific (cell-specific) between the neighbor cell.

Suppose can obtain under the prerequisite of channel condition information of all sub-districts at receiving-transmitting sides, the ideal model of received signal is:

$y=\left[\begin{array}{ccc}\sqrt{P_1}{H}_1& ...& \sqrt{P_N}{H}_N\end{array}\right]\left[\begin{array}{c}{W}_1\\ W_2\\ .\\ .\\ .\\ W_N\end{array}\right]s+n=\mathrm{HWs}+n$

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 the precoding weights of n sub-district correspondence _{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 a noise.Obviously, the CoMP system according to this modelling needs the problem that solves below the existence:

(1) design of pilot tone need 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: among the LTE R8, the pilot tone of cell-specific is a quadrature at neighbor cell, therefore each cooperation cell need be avoided pilot frequency locations separately when carrying out the mapping of subcarrier, terminal need be finished 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 weights: terminal need be respectively each cooperation cell and calculate weights, and feeds back, and the feedback overhead amount will be ratio with the quantity of cooperation cell to be increased.

Summary of the invention

The technical problem to be solved in the present invention provides 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:

Each circuit-switched data that data to be launched obtain after too much antenna processing is transmitted by different nodes or groups of nodes respectively.

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

Above-mentionedly data to be launched are carried out many antenna processing comprise: after control unit or service node sent to each cooperative node with above-mentioned data to be launched, each node carried out many antenna processing respectively; After perhaps above-mentioned data to be launched being carried out many antenna processing, the data after handling are sent to each node by control unit or service node.

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

Different nodes or groups of nodes transmits data packets are drawn together: above-mentioned service node and each cooperative node form according to predetermined wave beam and transmit after vector is dealt with this node circuit-switched data to be sent separately again.

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

Above-mentioned control unit or service node specify above-mentioned each node or groups of nodes to send a certain circuit-switched data by the control signaling; Or above-mentioned each node and groups of nodes are calculated voluntarily and are determined to send a certain circuit-switched data.

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

Above-mentioned service node and above-mentioned each cooperative node know that by control signaling or self calculation mode from above-mentioned control unit or service node acquisition the wave beam of the above-mentioned data of emission forms vector.

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

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

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

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

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

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 handled or circulation delay is handled.

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

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; When precoding respectively when each node is finished, corresponding precoding weights obtain by the control signaling of control unit or Serving cell.

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

Above-mentioned node comprises sub-district, 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, the transmit direction by different cooperative nodes adjustment signals can make power concentration in the residing position of UE, thereby obtains wave beam inborn nature processing gain.

Description of drawings

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

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

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

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

Fig. 5 carries out multipoint cooperative transmission transmit diversity principle schematic for adopting method for precoding in the embodiment of the invention;

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

Fig. 7 carries out the flow chart of multipoint cooperative transmission transmit diversity for adopting method for precoding in the embodiment of the invention;

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

Embodiment

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

For convenience, below the user by the multi-node collaboration service will be abbreviated as first kind user, user by the single node service is abbreviated as the second class user, abbreviate the register node at first kind user place as service node, abbreviate the node that participates in cooperation as cooperative node, transmit port is meant a plurality of antennas or the node of the same road of transmission signal.Node can but be not limited to and be sub-district, base station, relay station or Remote Radio Unit.

Basic thought of the present invention is: to each circuit-switched data that data to be launched obtain after too much antenna processing, transmitted by different nodes or groups of nodes respectively.

Wherein, each node comprises service node and cooperative node, and each node or groups of nodes are responsible for the transmission of one line data.Data to be launched are carried out many antenna processing to be comprised: after control unit or service node should data to be launched send to each cooperative node, each node carried out many antenna processing respectively; After perhaps these data to be launched being carried out many antenna processing, the data after handling are sent to each node by control unit or service node.After each node utilizes the wave beam formation vector of this node correspondence that this node circuit-switched data waiting for transmission is weighted processing, formation has one road signal of directivity, this wave beam forms vector can be by receiving the control signaling acquisition that control unit or service node are sent, and perhaps this node calculates and obtains.If precoding is finished at each node, the precoding weights are notified each node by control unit or Serving cell.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 sub-district ID delivery) after many antenna processing of each cooperative node transmission.When cooperative node and service node total number during,, make the group number identical with the CoMP port number with service node and cooperative node grouping more than or equal to the CoMP port 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 data to be launched are carried out data after many antenna processing;

Step 2: the control signaling that each node or groups of nodes 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 groups of nodes form vector with wave beam this node or the armed circuit-switched data of this groups of nodes and pilot tone in the cooperation resource are weighted, and the data in this resource are launched according to the direction of appointment.

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

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 handled, and the data after handling through diversity can be expressed as:

After each node will be mapped on each port of corresponding with service node respectively through the circuit-switched data that classification is handled, form vector with wave beam again and be weighted and launch.Among Fig. 2, service node is used to transmit the first via data through behind the SFBC coding, and it forms vector B with wave beam _SrData to be launched are carried out beam weighting.It is that determine with respect to the position of present node according to terminal or that determine according to the measurement of upward signal or definite according to the channel information of UE feedback that this wave beam forms vector.Can be expressed as through the signal after the weighted:

$y_{\mathrm{sr}}={\mathrm{<figure-callout\; id="1"\; label="B\; sr\; s"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">B</figure-callout>}}_{\mathrm{sr}}{s}_{}{}_1=\left[\begin{array}{c}{B}_{\mathrm{sr}}^{\left(0\right)}\\ .\\ .\\ .\\ B_{\mathrm{sr}}^{(p_{\mathrm{ser}}-1)}\end{array}\right]\left[\begin{array}{ccccc}{s}_1& {-s}_2^{*}& ...& s_{n-1}& {-s}_n^{*}\end{array}\right]$

Wherein, p _SerBe current service node antenna number; B _Sr ^mThe wave beam of representing m root service node antenna forms vector, 0≤m≤p _Ser-1.

Cooperative node is used to transmit the second road signal behind the SFBC coding, and it forms vector B with wave beam _CoData to be launched are carried out beam weighting.Through after the weighted, the signal of i cooperative node can be expressed as:

$y_{\mathrm{co}}^i=B_{\mathrm{co}}^i{s}_2=\left[\begin{array}{c}{B}_{\mathrm{co}}^{(i\_0)}\\ .\\ .\\ .\\ B_{\mathrm{co}}^{(i\_p_{\mathrm{co}}-1)}\end{array}\right]\left[\begin{array}{ccccc}{s}_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& ...& s_n& s_{n-1}^{*}\end{array}\right]$

Wherein, p _CoAntenna number for current cooperative node;

The wave beam of representing 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 in the circuit-switched data of service node transmission, and on other all cooperative nodes, all transmit an other circuit-switched data according to the mode of acquiescence through the diversity processing.

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

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.

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

$\left[\begin{array}{ccccc}{s}_1& {-s}_2^{*}& 0& 0& ...\\ s_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& 0& 0& ...\\ 0& 0& s_3& {-s}_4^{*}& ...\\ 0& 0& s_4& s_3^{*}& ...\end{array}\right]$

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

$y_{\#0}^i=B_{\#0}^i{s}_1=\left[\begin{array}{c}{B}_{\#0}^{(i\_0)}\\ .\\ .\\ .\\ B_{\#0}^{(i\_p_{\#0}-1)}\end{array}\right]\left[\begin{array}{ccccc}{s}_1& {-s}_2^{*}& 0& 0& ...\end{array}\right]$

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

The wave beam of representing 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:

$y_{\#1}^i=B_{\#1}^i{s}_2=\left[\begin{array}{c}{B}_{\#1}^{(i\_0)}\\ .\\ .\\ .\\ B_{\#1}^{(i\_p_{\#1}-1)}\end{array}\right]\left[\begin{array}{ccccc}{s}_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}& 0& 0& ...\end{array}\right]$

$y_{\#2}^i=B_{\#2}^i{s}_3=\left[\begin{array}{c}{B}_{\#2}^{(i\_0)}\\ .\\ .\\ .\\ B_{\#2}^{(i\_p_{\#2}-1)}\end{array}\right]\left[\begin{array}{ccccc}0& 0& s_3& {-s}_4^{*}& ...\end{array}\right]$

$y_{\#3}^i=B_{\#2}^i{s}_4=\left[\begin{array}{c}{B}_{\#3}^{(i\_0)}\\ .\\ .\\ .\\ B_{\#3}^{(i\_p_{\#3}-1)}\end{array}\right]\left[\begin{array}{ccccc}0& 0& s_4& s_3^{*}& ...\end{array}\right]$

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

And

The wave beam of representing i root antenna in the cooperative node 1,2,3 respectively 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, then the antenna with service node is divided into two groups, correspond to transmit port 0 and 1 respectively, 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 the 3rd, 4 circuit-switched data respectively 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 of correspondence of the present invention as shown in Figure 5, concrete steps comprise:

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

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

$y=\left[\begin{array}{ccc}\sqrt{P_1}{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">H</figure-callout>}}_1^{\&prime;}& ...& \sqrt{P_N}{H}_N^{\&prime;}\end{array}\right]\left[\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">W</figure-callout>}}_1^{\&prime;}\\ W_2^{\&prime;}\\ .\\ .\\ .\\ W_N^{\&prime;}\end{array}\right]s+n=\mathrm{HWs}+n$

Wherein, H ' _n=H _nB _nThe 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, W ' _nBe 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.

The transmit port number that has provided the CoMP correspondence among Fig. 5 is that a kind of precoding structure of 2 o'clock is to principle schematic that should embodiment.#1 of sub-district group and the #2 of sub-district group carry out precoding processing according to the precoding weights to the data of this port correspondence respectively, and form wave beam with wave beam formation vector on the direction of UE.The hypothesis pre-coding matrix is among the figure:

Then #1 of sub-district group and the #2 of sub-district group use precoding weights W respectively 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

With The precoding dateout is weighted.Under this pattern, every group of cooperative node that terminal is seen is equivalent to a transmit port among the CoMP.All cooperative nodes and service node have constituted the transmit port of CoMP together.

Application example 5:

The another kind of precoding specific implementation method of correspondence of the present invention as shown in Figure 6, concrete steps comprise:

Step 1: different cooperative nodes transmits respectively with the data after the 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 antenna mapping transmission according to the mode identical with service node through the data that precoding obtains.The signal that terminal receives is:

$y=\left[\begin{array}{ccc}\sqrt{P_1}{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="H2008101754782E0000021.png"\; state="\{\{state\}\}">H</figure-callout>}}_1& ...& \sqrt{P_N}{H}_N\end{array}\right]\mathrm{Ws}+n=\mathrm{HWs}+n$

The promptly all cooperative nodes and the channel of service node are superimposed as the channel H of an equivalence at the receiver place, terminal is calculated precoding weighted vector W according to this equivalent channel matrix H.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; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

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

Each circuit-switched data that data to be launched obtain after too much antenna processing is transmitted by different nodes or groups of nodes respectively.

2. as claim 1 described transmission method, it is characterized in that:

Describedly data to be launched are carried out many antenna processing comprise: after control unit or service node sent to each cooperative node with described data to be launched, each node carried out many antenna processing respectively; After perhaps described data to be launched being carried out many antenna processing, the data after handling are sent to each node by control unit or service node.

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

Different nodes or groups of nodes transmits data packets are drawn together: described service node and each cooperative node form according to predetermined wave beam and transmit after vector is dealt with this node circuit-switched data to be sent separately again.

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

Described control unit or service node specify described each node or groups of nodes to send a certain circuit-switched data by the control signaling; Or described each node and groups of nodes are calculated voluntarily and are determined to send a certain circuit-switched data.

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

Described service node and described each cooperative node know that by control signaling or self calculation mode from described control unit or service node acquisition the wave beam of the described data of emission forms vector.

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

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

As in the claim 1～6 each, it is characterized in that,

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

8. transmission method as claimed in claim 2 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 handled or circulation delay is handled.

9. transmission method as claimed in claim 2 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; When precoding respectively when each node is finished, corresponding precoding weights obtain by the control signaling of control unit or Serving cell.

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

Described node comprises sub-district, base station, relay station or Remote Radio Unit.

Images