CN101686080A - Multipoint-cooperation transmission method - Google Patents
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- CN101686080A CN101686080A CN200810161823A CN200810161823A CN101686080A CN 101686080 A CN101686080 A CN 101686080A CN 200810161823 A CN200810161823 A CN 200810161823A CN 200810161823 A CN200810161823 A CN 200810161823A CN 101686080 A CN101686080 A CN 101686080A
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Abstract
The invention discloses a multipoint-cooperation transmission method. The method comprises the following steps: in the multipoint-cooperation transmission, each cooperative node of the present cooperation carries out pilot frequency mapping and data mapping according to the antenna port characteristic of a service node of a target terminal in the present cooperation, and transmits the mapping result to the target terminal on an antenna of the node after mapping. The method enables terminals to be combined by a simple air interface so as to obtain spatial gain and avoid the interference of users in cell edges.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of coordinated multi-point transmission method.
Background technology
In order to provide high throughput to solve the interference problem of minizone simultaneously, the new generation of wireless communication system, long evolving system (Long-Term Evolution advance as evolution, LTE-Advance), super 3G technology (is called International Mobile Telecommunication advance again, be called for short IMT-Advance) etc., consider to introduce the collaboration MIMO (Multiple-InputMultiple-Out-put, MIMO technique) between network level.
The processing of among the LTE cell edge place being disturbed at present mainly contains following three kinds of methods: 1, interference randomization; 2, interference eliminated; 3, interference coordination (hiding).The method of interference randomization generally adopts frequency hopping, and during jumping, directly the method for expansion or frame hopping alleviates the influence of interference between the sub-district, its advantage is to need not the network planning, need the support of signaling hardly, still can only say to have alleviated interference, fundamentally do not eliminate; Though the method for interference eliminated can be used some algorithms to eliminate and disturb, the extra physical entity of general needs as multi-antenna technology etc., just can be finished the reasonable elimination of interference, and these conditions may not satisfy sometimes; The method of last big class interference coordination (hiding) is by some information between exchanging cell, use some algorithm to make each sub-district select adequate resources to transmit according to the feedback information and the situation of self of other sub-districts automatically, thereby realize the efficient utilization of minizone resource, collide the chance of utilizing and alleviate the minizone resource as far as possible, finally reach the lifting of cell-edge performance, thereby it emphasizes that avoid occurring the identical running time-frequency resource of minizone contention causes interference as far as possible.
Because the antenna distance of a plurality of neighbor cells of Cell Edge User distance is more or less the same, the interference problem that the user that higher capacity of therefore utilizing the transmitting antenna of a plurality of sub-districts to cooperate to realize cell edge place Radio Link and reliable transmission can be eliminated the cell edge place fully causes.In LTE-A, formally multipoint cooperative transmission (CoMP:Cooperative Multi-Point Transmission) technology is studied as a kind of alternative technique.Multipoint cooperative transmission technology characteristics are:
(1), be a mobile station MS service jointly by the cooperation of a plurality of base station BSs on identical Radio Resource.
(2) each BS can be one or more MS services simultaneously on identical Radio Resource.
Each company is respectively that the basis has proposed viewpoint separately with LTE aspect CoMP at present.In current LTE, the antenna port in the sub-district mainly is divided into antenna port0～3 (antenna port 0～3) of cell-specific (sub-district is specific).The antenna port 4 of MBMS (Multimedia Broadcast Multicast Service, multimedia broadcast multicast) service-specific, and the antennaport5 of user-specific (user is specific).In the viewpoint that current each company proposes, main what discuss is the relevant conceptual designs of many antenna algorithm, and the upstream cooperation MIMO based on zero limit that proposes comprising Alcatel-Lucent company is based on the collaboration MIMO of beam forming.Three kinds of theories that Errison company proposes: a) neither carry out the notice of any descending control signaling among the CoMP, also do not carry out any feedback relevant with CoMP based on the LTE compatibility; B) do not carry out the relevant descending control signaling notice of any CoMP among the CoMP, only carry out the measurement report of the relevant down channel of up CoMP.C) object UE (terminal) is not only carried out the relevant downlink signaling notice of CoMP, and UE need carry out the up feedback of the relevant descending channel information of CoMP simultaneously, mentions simultaneously in the cooperating process, and cooperation cell is in the theory of antenna port 5 cooperations.
But the collaboration method that such scheme is mainly considered under the situation based on the pilot tone quadrature of each cooperative node.If the complete quadrature of pilot tone, then be used for to significantly reduce for the resource of described object UE transmission data, if and the mode of dividing by sign indicating number keeps quadrature, then described object UE need could obtain the channel information of each cooperative node and feeds back by very complicated channel estimation method, as shown in Figure 1.As seen from Figure 1, among the LTE, the pilot tone of different districts is to avoid mutually by the skew of frequency.But simultaneously, the Data Position meeting of the sub-district of sub-district ID=1 and the pilot frequency locations conflict of sub-district ID=2, if therefore adopt non-completely orthogonal mode, then for the user of cell edge, the conflict between pilot tone and the data can influence the performance of channel estimated accuracy and Data Detection.And if avoid interference by elimination algorithm, then algorithm complex can be very high, in especially a plurality of cell cooperative scenes.For the terminal of power limited, this is not a kind of good method for designing undoubtedly.
Another kind of mode is the antenna port of a user-specific of redetermination, and all nodes all insert pilot tone according to the pilot frequency mode on this port under the situation of cooperation, realize eating dishes without rice or wine to merge, but this situation can be introduced Pilot Interference, as shown in Figure 2.Among Fig. 2, suppose that A and D are respectively the Serving cell in the different cooperations territory, when A and D carry out different UE cooperated in same asset, and when the cooperative node of selecting is respectively ABC and DEF, because all nodes all adopt identical port, and adopt identical pilot tone mapping mode, then the pilot tone of node E can be brought interference to the cooperate channel estimating in territory of ABC.The method that solves is to carry out a large amount of information interactions between the sub-district, the resource operating position of this node of node around the notice, and not only need to notify this node to close on node on every side, and need the direct or indirect more outer sub-district of notice, but this can increase the mutual amount of signaling greatly.
Summary of the invention
The technical problem to be solved in the present invention is the defective that exists at said method, considered that simultaneously system gets upward-compatible problem, a kind of coordinated multi-point transmission method is provided, UE can be merged by simple air interface, can obtain spatial gain, avoid interference of users in cell edges simultaneously.
In order to address the above problem, the invention provides a kind of coordinated multi-point transmission method, comprising:
In the multipoint cooperative transmission, each cooperative node that participates in this cooperation carries out pilot tone mapping and data map according to the antenna port characteristic of target terminal place service node in this cooperation, and the mapping back sends to target terminal on the antenna of this node.
Further, each cooperative node carries out pilot tone mapping according to the antenna port characteristic of described target terminal place service node and data map is meant:
Each cooperative node carries out pilot tone mapping and data map according to the port identity of the specific antenna port in the sub-district of described target terminal place service node respectively.
Further, each cooperative node carries out the pilot tone mapping according to the port identity of the specific antenna port in the sub-district of described target terminal place service node respectively and data map specifically is meant:
When only there was the specific antenna port in sub-district in the service node at target terminal place, all cooperative nodes all carried out pilot tone mapping and data map according to the port identity of the specific antenna port in this sub-district;
When there is the specific antenna port in a plurality of sub-districts in the service node at target terminal place, a plurality of cooperative nodes carry out pilot tone mapping and data map according to the port identity of the specific antenna port in different sub-districts respectively, or with a plurality of cooperative node groupings, different cooperative node groupings are carried out pilot tone mapping and data map according to the port identity of the specific antenna port in different sub-districts respectively.
Further, there is the specific antenna port in a plurality of sub-districts in service node when the target terminal place, and when a plurality of cooperative nodes carry out pilot tone mapping and data map according to the port identity of the specific antenna port of different districts respectively, data and the pilot tone form with wave beam forming is sent.
Further, each cooperative node carries out pilot tone mapping according to the antenna port characteristic of described target terminal place service node and data map is meant:
Each cooperative node carries out pilot tone mapping and data map according to the port identity of the specific antenna port of the user of described target terminal place service node respectively.
Further, each cooperative node carries out the pilot tone mapping according to the port identity of the specific antenna port of the user of described target terminal place service node respectively and data map specifically is meant:
When only there was the specific antenna port of user in the service node at target terminal place, all cooperative nodes all carried out pilot tone mapping and data map according to the port identity of the specific antenna port of this user;
When the service node at target terminal place exist a plurality of users specific antenna port the time, a plurality of cooperative nodes carry out pilot tone mapping and data map according to the port identity of the specific antenna port of different users respectively, or with the cooperative node grouping, different cooperative node groupings are carried out pilot tone mapping and data map according to the port identity of the specific antenna port of different users respectively.
Further, each cooperative node carries out pilot tone mapping according to the antenna port characteristic described in the service node of target terminal place and specifically is meant:
Each cooperative node calculates the pilot frequency locations and the pilot frequency sequence of the antenna port that is mapped to;
Each cooperative node all inserts pilot tone according to pilot frequency locations that is calculated and pilot frequency sequence.
Further, each cooperative node carries out pilot tone mapping according to the antenna port characteristic described in the service node of target terminal place and specifically is meant:
Each cooperative node calculates the pilot frequency locations and the pilot frequency sequence of the antenna port that is mapped to;
Each cooperative node carries out linear transformation to described pilot frequency sequence;
The pilot frequency sequence of each cooperative node after pilot frequency locations is inserted linear transformation.
Further, the linear transformation mode is a cyclic delay diversity, or phase place rotation diversity.
Further, each cooperative node carries out the linear transformation same with pilot tone to data when data map.
Further, described coordinated multi-point transmission method also comprises:
Set one greater than 1 thresholding, only, allow target terminal to carry out the switching of Serving cell when the ratio of the power of the power of a cooperative node and service node during more than or equal to this thresholding.
It is the availability gain that technical scheme of the present invention can make UE merge by simple air interface.And, can avoid the pilot tone collision problem by carrying out the mapping of pilot tone and data according to the antenna port of Serving cell, avoided the too high problem of computation complexity of UE simultaneously.Common UE in each cooperative node can carry out channel estimating and channel measurement in full bandwidth.
Description of drawings
Fig. 1 (a) and (b) are the pilot tone pattern schematic diagram of neighbor cell among the LTE;
The schematic diagram of the interference that Fig. 2 brings when handling by the same antenna port identity for all cooperation cell;
Fig. 3 is for LTE being the schematic diagram of example corresponding to the invention correspondence;
Schematic diagram when Fig. 4 is mapped to a plurality of antenna port for cooperative node among the present invention by fixed mode;
Fig. 5 is the concrete implementing procedure schematic diagram of application example one of the present invention;
Fig. 6 is for using in the example one cooperative node according to the schematic diagram of service node user-specific antenna terminal mapping;
Fig. 7 is for using in the example two cooperative node according to the schematic diagram of service node cell-specific antenna terminal mapping.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
The present invention is directed to the problem that above-mentioned existing scheme exists, the forward compatibility characteristic of taking into account system provides a kind of coordinated multi-point transmission method simultaneously, is particularly useful for the multipoint cooperative transmission under the minizone collaboration MIMO mode in the LTE-A system.
Coordinated multi-point transmission method provided by the present invention comprises:
In the multipoint cooperative transmission, each cooperative node that participates in this cooperation carries out pilot tone mapping and data map according to the antenna port characteristic of object UE place service node in this cooperation, and the mapping back sends to object UE on the antenna of this node.
Wherein, described cooperative node is used for the service node at auxiliary mark UE place in a CoMP transmission, be the object UE service jointly; That is to say,, send signal for object UE jointly by the service node and the cooperation of each cooperative node on identical Radio Resource of this object UE.Network side can be selected cooperative node in conjunction with the resource allocation and the loading condition thereof of adjacent node simultaneously according to metrical information; Can select according to each mode of present existence.
Wherein, described antenna port characteristic comprises the pilot frequency design of antenna port correspondence, pilot frequency sequence, the mapping method of data and relevant information thereof etc.
Optionally, the port identity of the antenna port of the cell-specific (sub-district is specific) of the service node at object UE place carried out pilot tone mapping and data map during each cooperative node can be cooperated according to this respectively; The port identity of the antenna port of the user-specific (user is specific) of object UE place service node carried out pilot tone mapping and data map during each cooperative node also can be cooperated according to this respectively.In the practical application, each cooperative node is not limited to shine upon according to above two kinds of antenna port characteristics.
Optionally, each cooperative node carries out the pilot tone mapping according to the port identity of the cell-specific antenna port of described object UE place service node respectively and data map specifically can be meant:
When only there was the antenna port of a cell-specific in the service node at object UE place, all cooperative nodes can be all carry out pilot tone mapping and data map according to the port identity of this cell-specific antenna port;
When there is the antenna port of a plurality of cell-specific in the service node at object UE place, a plurality of cooperative nodes can be respectively carry out pilot tone mapping and data map according to the port identity of the antenna port of different cell-specific, be cooperative node and corresponding one by one mapping of antenna port of cell-specific, this moment is preferred, data and pilot tone can be launched with the form of beam shaping beamforming; A plurality of cooperative nodes also can divide into groups, different cooperative nodes groupings are carried out pilot tone mapping and data map according to the port identity of the antenna port of different cell-specific respectively, the corresponding mapping of antenna port of promptly a plurality of cooperative nodes and a cell-specific; That is to say that the antenna port of a cell-specific can corresponding cooperative node, also can corresponding a plurality of cooperative nodes.Cooperative node to carry out the pilot tone mapping according at which antenna port and data map can be that network side is dynamically specified, and also can specify according to the rule of unalterable rules or agreement, divides into groups such as the odd even by node ID.
Optionally, each cooperative node carries out the pilot tone mapping according to the port identity of the user-specific antenna port of described object UE place service node respectively and data map specifically can be meant:
When only there was the antenna port of a user-specific in the service node at object UE place, all cooperative nodes can be all carry out pilot tone mapping and data map according to the port identity of this user-specific antenna port;
In order to give full play to different antenna modes, system also can be provided with the antenna port of a plurality of user-specific, when there is the antenna port of a plurality of user-specific in the service node at object UE place, a plurality of cooperative nodes can be respectively carry out pilot tone mapping and data map according to the port identity of the antenna port of different user-specific, cooperative node also can divide into groups, and the grouping of different cooperative nodes is carried out pilot tone mapping and data map according to the port identity of the antenna port of different user-specific respectively; Cooperative node to carry out the pilot tone mapping according at which antenna port and data map can be dynamic appointment, also can be according to the rule mapping of unalterable rules or agreement.For example, when the antenna port number of user-specific is 2, can but to be not limited to node ID be that the cooperative node of odd number and cooperative node that node ID is even number carry out the pilot tone mapping according to the port identity of different port respectively and data map (is mapped to port one as the odd number cooperative node, the even number node is mapped to port 2, thereby reduces internodal signaling consumption).
Optionally, the antenna port of the antenna port of different user-specific or different cell-specific transmits each the road signal through the signal of too much antenna processing respectively.
Optionally, many antenna processing mode that can adopt comprise empty processing frequently, handle when empty, empty time-frequency is handled, and SU-MIMO (single user's multiple-input and multiple-output) handles, and MU-MIMO (multi-user's multiple-input and multiple-output) handles, precoding precoding, beamforming, Alamouti handles, but is not limited to aforesaid way.
Optionally, each cooperative node carries out the pilot tone mapping according to the antenna port characteristic of object UE place service node in this cooperation and specifically can be meant:
Each cooperative node calculates the pilot frequency locations (also can be the pilot tone pattern) and the pilot frequency sequence of the antenna port of object UE place service node;
Each cooperative node all inserts pilot tone according to pilot frequency locations that is calculated and pilot frequency sequence, promptly inserts pilot frequency sequence in pilot frequency locations.
Optionally, each cooperative node carries out the pilot tone mapping according to the antenna port characteristic of object UE place service node in this cooperation and specifically also can be meant:
Each cooperative node calculates the pilot frequency locations (also can be called the pilot tone pattern) and the pilot frequency sequence of the antenna port of object UE place service node;
Each cooperative node carries out linear transformation to described pilot frequency sequence respectively---as CDD (cyclic delay diversity), the linear transformation of PSD modes such as (phase place rotation diversity), also can be the linear transformation of other type, certainly also can use the conversion of other form during practical application; Each cooperative node carries out the mode and the parameter of conversion can be identical, also can be different;
The pilot frequency sequence of each cooperative node after pilot frequency locations is inserted linear transformation.
By the CDD conversion,, can also obtain certain frequency diversity gain except obtaining to eat dishes without rice or wine to merge the gain.
Each cooperative node is according to the benefit of the pilot tone pattern insertion pilot tone (or the pilot frequency sequence after the linear transformation) of the corresponding port of service node: (1) UE can receive data according to the mode of eating dishes without rice or wine to merge.(2) and can avoid in the different cooperation territory, owing to used identical pilot tone pattern, and other cooperation territories are produced the pilot tone conflict.(3) because the public guide frequency of different districts and dedicated pilot quadrature often.Between the public guide frequency and public guide frequency of neighbor cell, dedicated pilot and dedicated pilot also are quadratures, in the scene of can avoiding cooperating, and the mutual pollution (interference) between the pilot tone, therefore for the different UEs under each cooperative node, can not influence its channel feedback in whole bandwidth.
If the pilot frequency sequence to cooperative node has carried out linear transformations, for example carried out CDD, then each cooperative node can carry out same CDD processing to data when data map, also can not carry out CDD and handle, also be the same when certainly, carrying out PSD or other linear transformation; Handle if carry out CDD, then network side passes through the amount of control signaling object UE CDD, but is not limited to this processing method.Other processing methods are included in carries out the diversity processing on the antenna port, SU-MIMO handles, and MU-MIMO handles.
Optionally, because the notion that CoMP has blured cell edge, therefore, in CoMP, should avoid the UE back and forth switching frequent, based on this in the minizone, can set one greater than 1 thresholding, have only under the situation of ratio more than or equal to thresholding of the power of the power of certain cooperation cell that UE measures and service node, just allow described object UE to switch, thereby avoid the frequent change of Serving cell.Certainly, also can be with other thresholding determination methods during practical application, such as switching by recently judging whether mutually, or be less than or equal to when setting thresholding switching etc. when the ratio of the power of service node and the power of certain cooperative node with difference power value and thresholding.
As shown in Figure 3, object UE is among the CoMP of UE A, its service node cell#3 (this paper is simplified illustration, is the formal description of the sub-district of n with cell#n with ID) and cooperative node cell#0, cooperative node cell# 1, cooperative node cell# 2 form cooperation territory 1 jointly; Object UE is among the CoMP of UE B, and its service node cell#8 and cooperative node cell# 4, cooperative node cell# 6, cooperative node cell#7 form cooperation territory 2 jointly; In two cooperation territories, each cooperative node all is that the port identity according to the antenna port 5 of service node in this cooperation territory (being object UE place service node among this CoMP) carries out data map and pilot tone mapping, and sends data after the mapping and pilot tone to corresponding UE.According to method of the present invention, because the pilot frequency locations in the different cooperation territories is according to the service node unanimity, and be quadrature as far as possible between the different service nodes, so can avoid the interference problem of pilot tone.
Node herein comprise following any or appoint several: sub-district, base station, relay station etc.
Said herein " cooperative node carries out pilot tone mapping and data map according to certain antenna port characteristic " also can be described as " cooperative node is mapped to certain antenna port ".
Using example with two of the present invention below further is illustrated.
As shown in Figure 4, according to the sign of cooperative node, according to fixing mode map to antenna port---be that cooperative node carries out according to which antenna port that pilot tone is shone upon and data map is fixed.In Fig. 4, be sign with the node ID, suppose that port number is 2, be first port that is mapped to of odd number with sub-district ID, sub-district ID is that the node of even number is mapped to second port.In Fig. 4,, transmit the two paths of signals that Alamouti encodes respectively on two antenna ports in order to obtain bigger gain.
According to above-mentioned invention, provide below and use example one, its flow process describes in conjunction with the antenna port that has defined among the current LTE as shown in Figure 5.
Use the step of example one:
In current LTE, defined the single antenna port 5 of user-specific.To be cooperative node shine upon according to the antenna port 5 of service node a kind of method.The characteristic of the so-called antenna port 5 among the LTE is: antenna port 5 is user-specific, only exists only in the Resource Block of user's use; Antenna port 5 corresponding one or more physical antennas, many physical antennas are hinted obliquely at antenna port 5 by the beam forming weights.
The first step, network side are according to metrical information, and the while is in conjunction with the node of the resource allocation and the loading condition selection cooperation thereof of adjacent node.Metrical information can be UE measure and each node of reporting to signal fadeout information or the power information of UE, also can be the UE positional information of network side according to the upward signal measurement; But be not limited to above-mentioned two kinds of information.
Preferred principle is to select resource that free time and the lighter node of load are arranged.When the load of adjacent node is bigger, when perhaps not having idling-resource to participate in the cooperation of service node, service node can consider not select this node to participate in cooperation when selecting cooperative node.
Second step, network side notice cooperative node, the cell ID of the service node at object UE place in this cooperation, cooperative node carries out the mapping of pilot tone according to the antenna port 5 of the service node at described object UE place.
In LTE, antenna port 5 is user-specific, only has the pilot signal of user-specifc on the resource of using this port.Cooperative node gets final product the position and the sequence of the pilot tone of user-specific in the calculation services node antenna port 5 according to the sign of service node.
The 3rd step, cooperative node insert pilot tone according to pilot frequency locations and the pilot frequency sequence of the user-specific that calculates.
As shown in Figure 6: for simply, here suppose that antenna port 5 does not have the situation of expansion, hypothesis sub-district Cell# 1 is in this cooperating process among Fig. 6, the Serving cell at UE place, sub-district Cell# 2 is for participating in the cooperation cell of cooperation, then this moment sub-district Cell# 2 the pilot tone pattern of user-specific antenna port insert pilot frequency sequence according to the pilot tone pattern of user-specific antenna port among the Cell# 1 of sub-district.
For the further gain of acquisition diversity, after cooperative node can carry out linear processing with the pilot frequency sequence of service node correspondence, the position of inserting pilot tone again.For example: establishing service node is α=(α to deserved pilot frequency sequence in the resource of distributing
1, α
2, α
3... α
n), when different cooperative nodes inserted, to its linear transformations α '=α .* ρ that carries out PSD, wherein ρ was linear phase sequence.And the sequence after the conversion is inserted into corresponding pilot frequency locations.Also can carry out the linear transformation of other form.
The 4th step, to data according to after handling with the same pattern of pilot frequency sequence, be mapped on the corresponding subcarrier and launch.For example pilot tone has been carried out linear transformations according to the mode of PSD.After then cooperative node carries out identical processing to data, carry out data map.
In the 3rd step, in the 4th step, all be to adopt the mode of PSD to carry out linear variation, what another discussed comparatively extensively a kind of linear variation is the method for utilizing CDD, specifically be, at first insert, simultaneously with the correspondence position of data map to subcarrier according to the pilot tone pattern of service node with pilot frequency sequence.After carrying out IFFT (inverse Fourier transform fast) afterwards, carry out circulation delay and handle, add Cyclic Prefix then.Here enumerate the method for two linear transformations, but be not limited to said method.
The 5th step, data and pilot tone after will shining upon are launched.Transmitting after the space merges of different cooperative nodes, receiver receives detection.
Use example two:
Be with the difference of application example one, behind the ID of cooperative node acquisition service node, the pilot tone pattern of the cell-specific antenna port correspondence of calculation services sub-district and the pilot frequency sequence of corresponding port; Further, insert the pilot frequency sequence of this antenna port correspondence that calculates as the pilot tone pattern of the user-specific antenna port of cooperative node in the cooperation resource according to the pilot tone pattern of the cell-specific antenna port correspondence that is mapped to that calculates.As shown in Figure 7: Cell# 2 is according to the sub-district ID of Cell# 1, can obtain the pilot tone pattern of cell-specific antenna port of Cell# 1 correspondence and the pilot frequency sequence of this resource correspondence.Simultaneously according to the network planning, suppose that cooperation cell Cell# 2 will be mapped to the antenna port 1 of Cell# 1, then Cell# 2 is according to the pilot frequency sequence of the cell-specific antenna port 1 of Cell# 1 in this resource, as the user-specific sequence of Cell# 2 in this resource, be inserted on the pilot frequency locations of cell# 1 port one correspondence.
Use example three:
In order to obtain bigger gain, system can be provided with the port of a plurality of user-specific, when having the port of a plurality of user-specific, and can be according to the different port of fixing mode map to service node.The port number of supposing user-specific is 2, is respectively first port and second port.
According to the sign of cooperative node, arrive antenna port according to fixing mode map.In Fig. 4, be sign with the node ID, node is divided into two classes, two category nodes; Sub-district ID is first port that is mapped to of odd number, and sub-district ID is that the node of even number is mapped to second port.In Fig. 4, in order to obtain bigger gain, transmit the two paths of signals that Alamouti encodes respectively on two ports, in Fig. 4, service node cell#0 cooperates with cooperative node cell# 1, cooperative node cell# 2, and service node cell#0 and cooperative node cell# 2 all send [s
1,-s
2 *], cooperative node cell# 1 sends [s
2, s
1 *].
The above is an implementation of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of coordinated multi-point transmission method comprises:
In the multipoint cooperative transmission, each cooperative node that participates in this cooperation carries out pilot tone mapping and data map according to the antenna port characteristic of target terminal place service node in this cooperation, and the mapping back sends to target terminal on the antenna of this node.
2, coordinated multi-point transmission method as claimed in claim 1, it is characterized in that each cooperative node carries out the pilot tone mapping according to the antenna port characteristic of described target terminal place service node and data map is meant: each cooperative node carries out pilot tone mapping and data map according to the port identity of the specific antenna port in the sub-district of described target terminal place service node respectively.
3, coordinated multi-point transmission method as claimed in claim 2 is characterized in that, each cooperative node carries out the pilot tone mapping according to the port identity of the specific antenna port in the sub-district of described target terminal place service node respectively and data map specifically is meant:
When only there was the specific antenna port in sub-district in the service node at target terminal place, all cooperative nodes all carried out pilot tone mapping and data map according to the port identity of the specific antenna port in this sub-district;
When there is the specific antenna port in a plurality of sub-districts in the service node at target terminal place, a plurality of cooperative nodes carry out pilot tone mapping and data map according to the port identity of the specific antenna port in different sub-districts respectively, or with a plurality of cooperative node groupings, different cooperative node groupings are carried out pilot tone mapping and data map according to the port identity of the specific antenna port in different sub-districts respectively.
4, coordinated multi-point transmission method as claimed in claim 2 is characterized in that:
There is the specific antenna port in a plurality of sub-districts in service node when the target terminal place, and when a plurality of cooperative nodes carry out pilot tone mapping and data map according to the port identity of the specific antenna port of different districts respectively, data and the pilot tone form with wave beam forming is sent.
5, coordinated multi-point transmission method as claimed in claim 1, it is characterized in that each cooperative node carries out the pilot tone mapping according to the antenna port characteristic of described target terminal place service node and data map is meant: each cooperative node carries out pilot tone mapping and data map according to the port identity of the specific antenna port of the user of described target terminal place service node respectively.
6, coordinated multi-point transmission method as claimed in claim 5 is characterized in that, each cooperative node carries out the pilot tone mapping according to the port identity of the specific antenna port of the user of described target terminal place service node respectively and data map specifically is meant:
When only there was the specific antenna port of user in the service node at target terminal place, all cooperative nodes all carried out pilot tone mapping and data map according to the port identity of the specific antenna port of this user;
When the service node at target terminal place exist a plurality of users specific antenna port the time, a plurality of cooperative nodes carry out pilot tone mapping and data map according to the port identity of the specific antenna port of different users respectively, or with the cooperative node grouping, different cooperative node groupings are carried out pilot tone mapping and data map according to the port identity of the specific antenna port of different users respectively.
As each described coordinated multi-point transmission method in the claim 1 to 6, it is characterized in that 7, each cooperative node carries out the pilot tone mapping according to the antenna port characteristic described in the service node of target terminal place and specifically is meant:
Each cooperative node calculates the pilot frequency locations and the pilot frequency sequence of the antenna port that is mapped to;
Each cooperative node all inserts pilot tone according to pilot frequency locations that is calculated and pilot frequency sequence.
As each described coordinated multi-point transmission method in the claim 1 to 6, it is characterized in that 8, each cooperative node carries out the pilot tone mapping according to the antenna port characteristic described in the service node of target terminal place and specifically is meant:
Each cooperative node calculates the pilot frequency locations and the pilot frequency sequence of the antenna port that is mapped to;
Each cooperative node carries out linear transformation to described pilot frequency sequence;
The pilot frequency sequence of each cooperative node after pilot frequency locations is inserted linear transformation.
9, coordinated multi-point transmission method as claimed in claim 8 is characterized in that:
The linear transformation mode is a cyclic delay diversity, or phase place rotation diversity.
10, coordinated multi-point transmission method as claimed in claim 8 or 9 is characterized in that:
Each cooperative node carries out the linear transformation same with pilot tone to data when data map.
11, as each described coordinated multi-point transmission method in the claim 1 to 6, it is characterized in that, also comprise:
Set one greater than 1 thresholding, only, allow target terminal to carry out the switching of Serving cell when the ratio of the power of the power of a cooperative node and service node during more than or equal to this thresholding.
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| WO2012003682A1 (en) * | 2010-07-06 | 2012-01-12 | 中兴通讯股份有限公司 | Method and system for antenna calibration based on time division duplexing coordinated multi-point transmission |
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