CN102264105A - Multipoint coordinated transmission method and apparatus thereof - Google Patents
Multipoint coordinated transmission method and apparatus thereof Download PDFInfo
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Abstract
The invention discloses a multipoint coordinated transmission method and an apparatus used for solve a problem that a plurality of cells can not collaboratively schedule users on unified source in multipoint coordinated transmission joint processing. According to the invention, with regard to a second kind of users which carry out data transmission together with a plurality of nodes, the nodes form a coordinated set to carry out data transmission on a special unicast time unit. Each node in a same coordinated set employs a same configuration mode in configuring PDCCH (Physical Downlink Control Channel) on the special unicast time unit. In the special unicast time unit, CSI-RS in the coordinated set carries out a quadrature design, and carries out punching or does not put data on a resource unit which is conflicted with CRI-RS of an adjacent cell. According to the invention, coordinated processing is carried out among a plurality of cells to obtain a coordinated merging gain and raise system throughput and frequency spectrum efficiency.
Description
Technical field
The present invention relates to the communications field, concrete, relate to a kind of multi-point cooperative transmission method and device.
Background technology
Along with senior Long Term Evolution (Long-Term EvolutionAdvanced, LTE-A) proposition of 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) (perhaps with OFDM certain the distortion) be the frequency division systems of basic multiple access multiplexing mode, with traditional with code division multiple access CDMA (Code-Division Multiple Access, CDMA) 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 antenna distance of a plurality of neighbor cells of Cell Edge User distance is more or less the same, and is vulnerable to most disturb and influences performance.If the different antennae that can utilize a plurality of sub-districts provides service simultaneously for the user of cell edge, then not only avoided the interference of minizone, can also give full play to the information that many antennas increase the space dimension, make the capacity of system and performance be increased dramatically.
Cooperative multipoint transmission is proposed under this background just.The different antennae that cooperative multipoint transmission is used a plurality of sub-districts provides service simultaneously as the user of cell edge, so not only avoided the interference of minizone, simultaneously owing to adopt the technology of many antennas, can give full play to many antennas increases the information of space dimension, makes that the capacity of system and performance are significantly promoted.Certainly cooperative multipoint transmission also is not limited to the minizone, in the sub-district, can use equally, because the emission of user profile spatially is separated into a plurality of transmission points, these transmission points are worked in coordination again, can realize power, the best configuration of frequency and space resources, thus can realize inhibition to disturbing, can realize the link performance of reliable and high power capacity again.
The multi-point cooperative transmission implementation mainly contains two kinds at present:
1) Combined Treatment (Joint Processing, JP)
A plurality of nodes by the Serving cell that comprises the user are that the user carries out joint transmission, and these nodes are when identical, carry out downlink transfer to the user on the resource frequently, and the user receives the data from a plurality of nodes, merges processing, obtains diversity gain.
2) cooperative scheduling/collaborative wave beam (Coordinated scheduling and/or beamforming, CS/CB)
A plurality of nodes by the Serving cell that comprises the user are that the user carries out cooperative scheduling, only the Serving cell by the user carries out downlink transfer to the user, other cooperative nodes disturb and avoid by cooperative scheduling/collaborative beam allocation, realize disturbing and suppress, and improve user performance.
CS/CB mode and Long Term Evolution protocol version 8 (LTE Release 8, R8) the interference coordination thought in is consistent, do not relate to multicast communication, and the JP mode needs a plurality of nodes jointly the user to be transmitted, so the CS/CB mode is lower than the JP mode to the requirement of system.
The JP mode faces following problem in realization:
1) (Physical Downlink Control Channel PDCCH) takies symbolic number possibility difference to the Physical Downlink Control Channel of each cooperation district, how to guarantee that each cooperation district uses identical running time-frequency resource to be user's downlink transfer;
2) common reference symbol of each cooperation district (Common reference signal, CRS), channel measurement pilot frequency (CSI-RS) difference, the collision problem of process user business datum and these pilot tones how.
Have only to have solved this two problems, the JP of a plurality of minizones just can carry out.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of multi-point cooperative transmission method and device, when being used to solve the multi-point cooperative transmission Combined Treatment, collaborative user's problem can't be dispatched in a plurality of sub-districts on unified resource, for achieving the above object, technical scheme of the present invention is achieved in that
A kind of multi-point cooperative transmission method, this method comprises:
For the first kind user who only carries out transfer of data, on any clean culture time quantum, independently carry out transfer of data for it by its service node by individual node;
The second class user for carried out transfer of data jointly by a plurality of nodes only carries out transfer of data by a plurality of nodes for it on special clean culture time quantum;
The time quantum that described special clean culture time quantum is MBSFN, described time quantum is time slot, subframe or radio frames.
Further, described first kind user is the non-collaborative user that independently dispatched, transmitted by service node or by the service node independent transmission, by the CS/CB user of collaborative set combined dispatching; The described second class user serves as reasons and works in coordination with the JP collaborative user of set joint transmission, combined dispatching.
Further, the a plurality of nodes that carry out transfer of data for the described second class user comprise service node and cooperative nodes, a part that is made of collaborative set or collaborative set described service node and cooperative nodes is carried out transfer of data for the described second class user jointly, and described collaborative set is determined according to the hybrid mode of UE-specific mode or Cell-specific mode or above-mentioned dual mode combination.
Further, be PDCCH configuration 1,2,3 or 4 OFDM symbols in described special clean culture time quantum, perhaps the MBSFN time quantum is to increase the mapping that 1,2 or 3 OFDM symbols are used for PDCCH on the basis of OFDM number of symbols of PDCCH configuration again in Long Term Evolution protocol version 8.
Further, in described special clean culture time quantum, begin to carry out the mapping of PDSCH from fixing OFDM character position, described fixing OFDM character position is the 2nd, the 3rd, the 4th or the 5th.
Further, adopt static configuration mode or semi-static configuration mode in described special clean culture time quantum, to be PDCCH configuration OFDM symbol.
Further, each node adopts identical configuration mode to dispose PDCCH on described special clean culture time quantum, and described identical configuration mode comprises the position and the number of the OFDM symbol that is used for the PDCCH mapping and is used for the initial OFDM character position of PDSCH mapping.
Further, in described special clean culture time quantum, CRS only is disposed on preceding 2 OFDM symbols, and when resource was shone upon, for the second class user, its service node carried out the resource mapping according to the CSI-RS position relation of this node; Each cooperative nodes carries out the resource mapping according to the CSI-RS position relation of service node, when collaborative user's data are conflicted with the CSI-RS of this sub-district, collaborative user's data is punched.
Further, in described special clean culture time quantum, the CSI-RS in the collaborative set carries out orthogonal design, and with Resource Unit that the CSI-RS of adjacent sub-district conflicts on, data are punched or are not put data.
Further, in described special clean culture time quantum, be preferably the second class user and carry out scheduling of resource.
Further, each node adopts identical circulating prefix-length in the collaborative set of described special clean culture time quantum.
Further, when carrying out transfer of data at the second class user, identical antenna configurations and the polarization mode of the preferential employing of each node.
Based on said method, the present invention also proposes a kind of multi-point cooperative transmission device, and this device comprises:
Resource distribution and mapping block only are used to by individual node and carry out the first kind user of transfer of data and carried out second class user unit setup time of transfer of data jointly and carried out the resource mapping by a plurality of nodes; Described time quantum is time slot, subframe or radio frames;
For first kind user, on any clean culture time quantum, carry out resource distribution and mapping for it by the resource distribution and the mapping block independence of its service node; For the second class user, carry out resource distribution and mapping for it at special clean culture time quantum by the resource distribution of each node and mapping block; The time quantum that described special clean culture time quantum is MBSFN;
Data transmission unit is used to the first kind user and the second class user to carry out transfer of data;
For first kind user, the data transmission unit by its service node on any clean culture time quantum independently carries out transfer of data for it; For the second class user, only on special clean culture time quantum, carry out the synergistic data transmission for it by the data transmission unit of a plurality of nodes.
Further, the a plurality of nodes that carry out transfer of data for the described second class user comprise service node and cooperative nodes, constitute the part of collaborative set or collaborative set by described service node and cooperative nodes, carry out transfer of data for described user jointly by the data transmission unit in the described collaborative set, described collaborative set is according to determining based on the UE-specific mode or based on the hybrid mode of Cell-specific mode or above-mentioned dual mode combination.
Further, described resource distribution and mapping block, be PDCCH configuration 1,2,3 or 4 OFDM symbols in described special clean culture time quantum, perhaps the MBSFN time quantum is to increase the mapping that 1,2 or 3 OFDM symbols are used for PDCCH on the basis of OFDM number of symbols of PDCCH configuration again in Long Term Evolution protocol version 8.
Further, described resource distribution and mapping block, in described special clean culture time quantum, from fixing OFDM character position configuration PDSCH, described fixing OFDM character position is the 2nd, the 3rd, the 4th or the 5th.
Further, in each node in the same collaborative set, described resource distribution and mapping block adopt identical configuration mode to dispose PDCCH on described special clean culture time quantum, and described configuration mode comprises the position and the number of the OFDM symbol that is used for the PDCCH mapping and is used for the initial OFDM character position of PDSCH mapping.
Further, described resource distribution and mapping block, only preceding 2 the OFDM symbols configuration CRS in described special clean culture time quantum; When resource was shone upon, for the second class user, the resource distribution of its service node and mapping block carried out the resource mapping according to the CSI-RS position relation of this node; The resource distribution of each cooperative nodes and mapping block carry out the resource mapping according to the CSI-RS position of service node relation, when collaborative user's data are conflicted with the CSI-RS of this sub-district, collaborative user's data are punched or are not put data.
Described resource distribution and mapping block carry out orthogonal design to the CSI-RS of the described special clean culture time quantum in the collaborative set.
Further, when carrying out transfer of data, in described special clean culture time quantum, adopt identical circulating prefix-length at the second class user; Identical antenna configurations and the polarization mode of the preferential employing of each node in the described collaborative set.
Method by adopting the present invention to provide, realized following effect:
The present invention when collaborative user's data are conflicted with the CSI-RS of cooperation district, destroys data or does not send out data when being configured at the second class user, when not influencing the collaborative user fully and carrying out channel measurement to the reception of CRS, CSI-RS;
The CSI-RS orthogonality of a plurality of minizones is also supported the expansion from single cell measurement to many cell measurements;
By distinguishing the different configurations on clean culture time quantum and special clean culture time quantum, non-collaborative user is not affected, realized forward compatibility to R8.
In a word,, make a plurality of minizones can carry out Combined Treatment, obtain the collaborative gain that merges, improve throughput of system and spectrum efficiency by the present invention.
Description of drawings
Fig. 1 is the cell topology figure of the embodiment of the invention 1;
Fig. 2 is the subframe structure figure of the embodiment of the invention 1,2;
Fig. 3 is subframe 7,8 structures 1 schematic diagram in the embodiment of the invention 1;
Fig. 4 is the cell topology figure of the embodiment of the invention 2;
Fig. 5 is the cell topology figure of the embodiment of the invention 3;
Fig. 6 is the subframe structure figure of the embodiment of the invention 3;
Fig. 7 is a multi-point cooperative transmission structure drawing of device of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
The present invention is divided into two classes with the user in the system: be respectively the first kind user and the second class user.
First kind user: the user who only carries out transfer of data by individual node (service node); Such user can be the non-collaborative user who is only independently dispatched, transmitted by service node, as R8 user; Also can be only by the service node independent transmission, by the CS/CB collaborative user of collaborative set combined dispatching;
The second class user: carry out the user of transfer of data jointly by a plurality of nodes, such user refers to the JP collaborative user by collaborative set joint transmission, combined dispatching.A plurality of nodes here specifically comprise service node and several cooperative nodes, and they constitute the part of collaborative set or collaborative set.Can be according to determining (UE-specific) mode based on the user or determine that based on the sub-district hybrid mode of (Cell-specific) mode or this dual mode combination determines collaborative set, the node in the collaborative set can be the radio frequency unit, trunking in individual cell or the sub-district etc.
Wherein, to first kind user, can independently be carried out the transmission of data for it by its service node on any clean culture time quantum, described any clean culture time quantum comprises: common clean culture time quantum, special clean culture time quantum.To the second class user, only can on some special clean culture time quantum, carry out the transmission of data for it by collaborative set.
Special clean culture time quantum of the present invention is the transmission time unit of Multicast Broadcast Single Frequency Network (MBSFN), and described time quantum can be time slot, subframe or radio frames.
At present in the LTE agreement, the MBSFN time quantum is by MCE (Multi-cell/multicastCoordination Entity, the multi-cell cooperating entity) disposes, MBSFN time quantum among the present invention is not limited to the MCE configuration, it also can be base station configuration, R8 user thinks that these MBSFN time quantums are used to carry multicast service, and R10 or R11 or R12 user can identify these MBSFN time quantum carrying unicast services, thereby the PDCCH symbol to these MBSFN time quantums carries out blind Detecting, obtain downstream grants, and then understand this user PDSCH resource allocation information.
In the specific embodiment of the invention, in special clean culture time quantum, dispose the OFDM symbol of fixed number for PDCCH, preferred configuration 1,2,3 or 4 OFDM symbols, perhaps the MBSFN time quantum is the mapping that the OFDM symbol that disposes fixed number on the basis of OFDM number of symbols of PDCCH configuration again is used for PDCCH in LTE Release8, preferably can increase the mapping that 1,2 or 3 OFDM symbols are used for PDCCH.
In the specific embodiment of the invention, in special clean culture time quantum, begin to carry out the mapping of PDSCH from fixing OFDM character position, Gu Ding OFDM symbol can be the 2nd, the 3rd, the 4th or the 5th OFDM symbol here.
In the specific embodiment of the invention, adopt static configuration mode or semi-static configuration mode in described special clean culture time quantum, to be PDCCH configuration OFDM symbol.
In the specific embodiment of the invention, in order to guarantee that each cooperation district uses identical running time-frequency resource to be user's downlink transfer, each node (comprising service node and cooperative nodes) in the same collaborative set adopts identical configuration mode to dispose PDCCH on described special clean culture time quantum, described identical configuration mode comprise the OFDM symbol that is used for the PDCCH mapping position and number, be used for the initial OFDM character position of PDSCH mapping.
In the specific embodiment of the invention, in described special clean culture time quantum, CRS only is disposed on preceding 2 OFDM symbols, and when resource was shone upon, for the second class user, its service node carried out the resource mapping according to the CSI-RS position relation of this node; Each cooperative nodes carries out the resource mapping according to the CSI-RS position relation of service node, when collaborative user's data are conflicted with the CSI-RS of this sub-district, collaborative user's data is punched; User (non-collaborative user) for this sub-district carries out the resource mapping according to the relation of the CSI-RS position in this sub-district.
In the specific embodiment of the invention, the CSI-RS in the collaborative set carries out orthogonal design, and to Resource Unit that adjacent sub-district CSI-RS conflicts on, data are punched or are not put data.
Preferably, the present invention is preferably the second class user and carries out scheduling of resource in special clean culture time quantum.
Preferably, when each node carries out downlink transfer in the described collaborative set, in special clean culture time quantum, adopt identical circulating prefix-length.
Preferably, each node select in the described collaborative set adopts identical antenna configurations and polarization mode.
Example 1:
Among this embodiment, described special clean culture time quantum is the MBSFN subframe, in the MBSFN subframe, be the OFDM symbol of PDCCH configuration fixed number, or the MBSFN subframe is the mapping that the OFDM symbol that disposes fixed number on the basis of OFDM number of symbols of PDCCH configuration again is used for PDCCH in R8.Mode for PDCCH configuration OFDM symbol in described MBSFN subframe adopts static or semi-static configuration mode.
As shown in Figure 1, user 1,2 Serving cell is sub-district 1, and user 3 Serving cell is sub-district 2, and user 4 Serving cell is sub-district 3.User 1 is the second class user, constitutes collaborative set by sub-district 1,2,3 and is its Combined Treatment.User 2,3,4 is first kind user, and is the non-collaborative user among the first kind user.
To first kind user 2,3,4, independently dispatch by affiliated Serving cell respectively.To the second class user 1, carry out combined dispatching by the collaborative set that comprises sub-district 1,2,3, described collaborative set is determined according to the hybrid mode of UE-specific mode or Cell-specific mode or above-mentioned dual mode combination.
The sub-frame configuration of system as shown in Figure 2, to 10 subframes in the radio frames, subframe numbers mould 10 is that 7,8,9 subframe is the MBSFN subframe, all the other subframes are unicast sub.
Sub-district 1,2,3 is independently dispatched the first kind user of sub-district (being respectively user 2, user 3, user 4) separately in subframe 0 on subframe 6 these 7 unicast sub, sub-district 1,2,3 is in the MBSFN subframe, the combined dispatching second class user (user 1) that is subframe 7 on the subframe 9, existence because of the MBMS of system business, finally determine dispatched users 1 on subframe 7,8, transmission MBSFN business on the subframe 9.
On subframe 7,8, as shown in Figure 3, the PDCCH of sub-district 1, sub-district 2, sub-district 3 all takies preceding 2 OFDM symbols, and other OFDM symbol is used to shine upon PDSCH; Or the PDCCH of sub-district 1, sub-district 2, sub-district 3 all takies preceding 3 OFDM symbols; Or the PDCCH of sub-district 1, sub-district 2, sub-district 3 all takies preceding 4 OFDM symbols.CRS only shines upon on preceding 2 OFDM symbols, sub-district 1, sub-district 2, sub-district 3 are according to the CSI-RS pattern of sub-district 1, go up mapping user's 1 PDSCH at CSI-RS Resource Unit (RE) other RE in addition that removes sub-district 1, and on shared band resource, use identical modulation coding mode.After finishing PDSCH mapping, PDSCH is destroyed in sub-district 2, sub-district 3 on the RE position of CSI-RS separately mapping, and on the RE position of CSI-RS separately mapping CSI-RS separately.Final sub-district 1 need be destroyed the PDSCH on sub-district 2, the sub-district 3CSI-RS RE equally, thereby guarantees not disturb mutually on each sub-district CSI-RS RE in the collaborative set.Preferably, the collaborative CSI-RS that is used for user 1 carries out in the MBSFN subframe of combined dispatching that is integrated into that constitutes of sub-district 1, sub-district 2, sub-district 3 adopts orthogonal design.
In the embodiment of the invention, sub-district 1, sub-district 2 and sub-district 3 are preferably the second class user and carry out scheduling of resource, and after finishing resource mapping, sub-district 1, sub-district 2, sub-district 3 are when identical, work in coordination with transmission to user 1 on the resource frequently.
Example 2:
Among this embodiment, described special clean culture time quantum is the MBSFN subframe.Mode for PDCCH configuration OFDM symbol in described MBSFN subframe adopts static or semi-static configuration mode.
As shown in Figure 4, user 1,4 Serving cell is sub-district 1, and user 2 Serving cell is sub-district 2, and user 3 Serving cell is sub-district 3.User 1 is the second class user, constitutes collaborative set by sub-district 1,2,3 and is its Combined Treatment.User 2 is first kind user, and is the CS/CB collaborative user among the first kind user, by sub-district 2, sub-district 3 to its cooperative scheduling.User 3,4 is the R8 user among the first kind user, promptly non-collaborative user.
To the second class user 1, carry out combined dispatching, joint transmission by the collaborative set that comprises sub-district 1,2,3.To first kind user 2, carry out combined dispatching by the collaborative set that comprises sub-district 2, sub-district 3, by Serving cell (sub-district 2) to its independent transmission.To first kind user 3,4, only by Serving cell separately independently dispatch, independent transmission.
The sub-frame configuration of system as shown in Figure 2, to 10 subframes in the radio frames, subframe numbers mould 10 is that 7,8,9 subframe is the MBSFN subframe, all the other subframes are unicast sub.
By the combined dispatching of sub-district 2, sub-district 3,, and determined the 2 couples of users' 2 in sub-district emission value for user 2 has distributed subframe 0 to subframe 6 these 7 unicast sub.Sub-district 3 when identical, dispatched users 3 on the resource frequently, by selecting emission value, make user 2 and user's 3 weighting channel quadrature, thereby user 2, user 3 have realized disturbing and have avoided.Sub-district 1 is in subframe 0 independent dispatched users 4 on the subframe 6.Sub-district 1,2,3 is in the MBSFN subframe, and promptly subframe 7 combined dispatching second class user (user 1) on the subframe 9 because of the existence of the MBMS of system business, finally determines dispatched users 1 on subframe 7,8, transmission MBSFN business on the subframe 9.
The mapping mode of sub-district 1, sub-district 2, sub-district 3 configuration PDCCH, PDSCH, CRS and CSI-RS is that with embodiment 1 difference on subframe 7,8, the PDCCH of sub-district 1, sub-district 2, sub-district 3 all takies preceding 3 or preceding 4 OFDM symbols with embodiment 1; Identical antenna configurations and polarization mode are all adopted in sub-district 1, sub-district 2, sub-district 3.
Example 3:
As shown in Figure 5, user 1,2 Serving cell is sub-district 1, and user 3 Serving cell is sub-district 2, and user 4 Serving cell is sub-district 3.Do not have the second class user in the system, user 1 is the CS/CB collaborative user among the first kind user, constitutes collaborative set to its cooperative scheduling by Serving cell (sub-district 1), sub-district 2, sub-district 3.The R8 user that user 2,3,4 is among the first kind user, promptly non-collaborative user.
Because there is not the second class user, so the MBSFN subframe in this system need not to carry the Combined Treatment data, only is used for the MBMS transmission business.
To first kind user 1, carry out combined dispatching, carry out the independent transmission joint transmission by sub-district 1 by the collaborative set that comprises sub-district 1,2,3.To first kind user 2,3,4, by Serving cell separately independently dispatch, independent transmission.
The sub-frame configuration of system as shown in Figure 6, subframe numbers mould 10 is that 9 subframe is the MBSFN subframe, so subframe 0 is unicast sub to subframe 8, subframe 9 is the MBSFN subframe.
By the combined dispatching of sub-district 1, sub-district 2, sub-district 3,, and determined the 1 couple of user's 1 in sub-district emission value for user 1 has distributed subframe 0 to subframe 5 these 6 unicast sub.Sub-district 2 when identical, dispatched users 3 on the resource frequently, sub-district 3 when identical, dispatched users 4 on the resource frequently, by selecting emission value, make user 1, user 3, user's 4 weighting channel quadrature, thereby user 1, user 3, user 4 have realized disturbing and have avoided.Sub-district 1 is in subframe 0 independent dispatched users 2 on the subframe 8, guarantee user 2 and user 1 the time, the resource quadrature gets final product frequently.Subframe 9 does not allow any sub-district independently to dispatch, and is used for the MBMS transmission business.
Because there is not the second class user, so sub-district 1, sub-district 2, sub-district 3 are all according to PDCCH, CRS separately, the resource mapping that CSI-RS carries out dispatched users.
In the above example, only the PDCCH symbol numbers of transmitting the second class user is illustrated, specifically do not indicate Cyclic Prefix (CP) length that the MBSFN subframe as special clean culture time quantum is adopted, can adopt Cyclic Prefix commonly used (normal CP) in the specific embodiment of the invention, also can adopt extended cyclic prefix (entended CP); Preferably, when each node carries out downlink transfer in the collaborative set, in special clean culture time quantum, adopt identical circulating prefix-length.
Embodiment 4:
Method based on the present invention's proposition, the present invention also proposes a kind of multi-point cooperative transmission device, and as shown in Figure 7, this device is positioned at each cooperative nodes, collaborative is that the second class user carries out transfer of data, and this device comprises: resource distribution and mapping block and data transmission unit.
Resource distribution and mapping block only are used to by individual node and carry out the first kind user of transfer of data and carried out second class user unit setup time of transfer of data jointly and carried out the resource mapping by a plurality of nodes; Described time quantum is time slot, subframe or radio frames;
For first kind user, on any clean culture time quantum, carry out resource distribution and mapping for it by the resource distribution and the mapping block independence of its service node; For the second class user, carry out resource distribution and mapping for it at special clean culture time quantum by the resource distribution of each node and mapping block; The time quantum that described special clean culture time quantum is MBSFN;
Data transmission unit is used to the first kind user and the second class user to carry out transfer of data;
For first kind user, the data transmission unit by its service node on any clean culture time quantum independently carries out transfer of data for it; For the second class user, only on special clean culture time quantum, carry out the synergistic data transmission for it by the data transmission unit of a plurality of nodes.
The interior a plurality of nodes of collaborative set that are second class user service comprise service node and cooperative nodes, constitute a collaborative set or a collaborative part of gathering by service node and cooperative nodes, described collaborative set is according to determining based on the UE-specific mode or based on the hybrid mode of Cell-specific mode or above-mentioned dual mode combination.
Preferably, resource distribution and mapping block for the OFDM symbol of PDCCH configuration fixed number, preferably, dispose 1,2,3 or 4 OFDM symbols in described special clean culture time quantum; Perhaps the MBSFN time quantum is the mapping that the OFDM symbol that disposes fixed number on the basis of OFDM number of symbols of PDCCH configuration again is used for PDCCH in Long Term Evolution protocol version 8, preferably can increase the mapping that 1,2 or 3 OFDM symbols are used for PDCCH;
Preferably, resource distribution and mapping block are in described special clean culture time quantum, and from fixing OFDM character position configuration PDSCH, described fixing OFDM character position is the 2nd, the 3rd, the 4th or the 5th.
Preferably, in each node in the same collaborative set, described resource distribution and mapping block adopt identical configuration mode to dispose PDCCH on described special clean culture time quantum, and described configuration mode comprises the position and the number of the OFDM symbol that is used for the PDCCH mapping and is used for the initial OFDM character position of PDSCH mapping.
Preferably, described resource distribution and mapping block, only preceding 2 the OFDM symbols configuration CRS in described special clean culture time quantum; When resource was shone upon, for the second class user, the resource distribution of its service node and mapping block carried out the resource mapping according to the CSI-RS position relation of this node; The resource distribution of each cooperative nodes and mapping block carry out the resource mapping according to the CSI-RS position of service node relation, when collaborative user's data are conflicted with the CSI-RS of this sub-district, collaborative user's data are punched or are not put data.
Preferably, when each node carries out downlink transfer in the described collaborative set, in described special clean culture time quantum, adopt identical circulating prefix-length; Each node in the described collaborative set adopts identical antenna configurations and polarization mode.
Understandable, the non-MBSFN subframe of refering in particular to of special clean culture time quantum of the present invention also can be time slot, subframe or the radio frames that can finish identical function.
Need to prove, in configuration mode described herein,, when carrying out unicast transmission, can only on the subframe that is considered as non-MBSFN by LTE Release 8, transmit for 8 users of the LTERelease among the first kind user.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (20)
1. a multi-point cooperative transmission method is characterized in that, this method comprises:
For the first kind user who only carries out transfer of data, on any clean culture time quantum, independently carry out transfer of data for it by its service node by individual node;
The second class user for carried out transfer of data jointly by a plurality of nodes only carries out transfer of data by a plurality of nodes for it on special clean culture time quantum;
The time quantum that described special clean culture time quantum is Multicast Broadcast Single Frequency Network (MBSFN).
2. method according to claim 1 is characterized in that,
Described first kind user is the non-collaborative user that independently dispatched, transmitted by service node or by the service node independent transmission, by cooperative scheduling/collaborative wave beam (CS/CB) user of collaborative set combined dispatching;
The described second class user serves as reasons and works in coordination with Combined Treatment (JP) collaborative user of set joint transmission, combined dispatching.
3. method according to claim 1, it is characterized in that, the a plurality of nodes that carry out transfer of data for the described second class user comprise service node and cooperative nodes, constitute the part of working in coordination with set or working in coordination with set by described service node and cooperative nodes and carry out transfer of data for the described second class user jointly, described collaborative set basis is determined (UE-specific) mode based on the user or is determined based on the hybrid mode of definite (Cell-specific) mode in sub-district or above-mentioned dual mode combination.
4. method according to claim 1, it is characterized in that, be Physical Downlink Control Channel (PDCCH) configuration 1,2,3 or 4 OFDMs (OFDM) symbol in described special clean culture time quantum, perhaps the MBSFN time quantum is to increase the mapping that 1,2 or 3 OFDM symbols are used for PDCCH on the basis of OFDM number of symbols of PDCCH configuration again in Long Term Evolution protocol version 8.
5. method according to claim 1, it is characterized in that, in described special clean culture time quantum, begin to carry out the mapping of Physical Downlink Shared Channel (PDSCH) from fixing OFDM character position, described fixing OFDM character position is the 2nd, the 3rd, the 4th or the 5th.
6. method according to claim 1 is characterized in that, adopts static configuration mode or semi-static configuration mode to be PDCCH configuration OFDM symbol in described special clean culture time quantum.
7. method according to claim 1, it is characterized in that, each node adopts identical configuration mode to dispose PDCCH on described special clean culture time quantum, and described identical configuration mode comprises the position and the number of the OFDM symbol that is used for the PDCCH mapping and is used for the initial OFDM character position of PDSCH mapping.
8. method according to claim 1, it is characterized in that, in described special clean culture time quantum, common reference symbol (CRS) only is disposed on preceding 2 OFDM symbols, when resource is shone upon, for the second class user, its service node carries out the resource mapping according to channel measurement pilot frequency (CSI-RS) the position relation of this node; Each cooperative nodes carries out the resource mapping according to the CSI-RS position relation of service node, when collaborative user's data are conflicted with the CSI-RS of this sub-district, collaborative user's data is punched.
9. method according to claim 1 is characterized in that, in described special clean culture time quantum, the CSI-RS in the collaborative set carries out orthogonal design, and with Resource Unit that the CSI-RS of adjacent sub-district conflicts on, data are punched or are not put data.
10. method according to claim 1 is characterized in that, in described special clean culture time quantum, is preferably the second class user and carries out scheduling of resource.
11. method according to claim 1 is characterized in that, each node adopts identical circulating prefix-length in the collaborative set of described special clean culture time quantum.
12. method according to claim 1 is characterized in that, when carrying out transfer of data at the second class user, and identical antenna configurations and the polarization mode of the preferential employing of each node.
13., it is characterized in that described time quantum is time slot, subframe or radio frames according to the arbitrary described method of claim 1 to 12.
14. a multi-point cooperative transmission device is characterized in that, this device comprises:
Resource distribution and mapping block only are used to by individual node and carry out the first kind user of transfer of data and carried out second class user unit setup time of transfer of data jointly and carried out the resource mapping by a plurality of nodes; Described time quantum is time slot, subframe or radio frames;
For first kind user, on any clean culture time quantum, carry out resource distribution and mapping for it by the resource distribution and the mapping block independence of its service node; For the second class user, carry out resource distribution and mapping for it at special clean culture time quantum by the resource distribution of each node and mapping block; The time quantum that described special clean culture time quantum is MBSFN;
Data transmission unit is used to the first kind user and the second class user to carry out transfer of data;
For first kind user, the data transmission unit by its service node on any clean culture time quantum independently carries out transfer of data for it; For the second class user, only on special clean culture time quantum, carry out the synergistic data transmission for it by the data transmission unit of a plurality of nodes.
15. device according to claim 14 is characterized in that,
The a plurality of nodes that carry out transfer of data for the described second class user comprise service node and cooperative nodes, constitute the part of collaborative set or collaborative set by described service node and cooperative nodes, carry out transfer of data for described user jointly by the data transmission unit in the described collaborative set, described collaborative set is according to determining based on the UE-specific mode or based on the hybrid mode of Cell-specific mode or above-mentioned dual mode combination.
16. device according to claim 14 is characterized in that,
Described resource distribution and mapping block, be PDCCH configuration 1,2,3 or 4 OFDM symbols in described special clean culture time quantum, perhaps the MBSFN time quantum is to increase the mapping that 1,2 or 3 OFDM symbols are used for PDCCH on the basis of OFDM number of symbols of PDCCH configuration again in Long Term Evolution protocol version 8.
17. device according to claim 14, it is characterized in that described resource distribution and mapping block are in described special clean culture time quantum, from fixing OFDM character position configuration PDSCH, described fixing OFDM character position is the 2nd, the 3rd, the 4th or the 5th.
18. device according to claim 14 is characterized in that,
In each node in the same collaborative set, described resource distribution and mapping block adopt identical configuration mode to dispose PDCCH on described special clean culture time quantum, and described configuration mode comprises the position and the number of the OFDM symbol that is used for the PDCCH mapping and is used for the initial OFDM character position of PDSCH mapping.
19. device according to claim 14 is characterized in that,
Described resource distribution and mapping block, only preceding 2 the OFDM symbols configuration CRS in described special clean culture time quantum; When resource was shone upon, for the second class user, the resource distribution of its service node and mapping block carried out the resource mapping according to the CSI-RS position relation of this node; The resource distribution of each cooperative nodes and mapping block carry out the resource mapping according to the CSI-RS position of service node relation, when collaborative user's data are conflicted with the CSI-RS of this sub-district, collaborative user's data are punched or are not put data.
Described resource distribution and mapping block carry out orthogonal design to the CSI-RS of the described special clean culture time quantum in the collaborative set.
20. device according to claim 14 is characterized in that, when carrying out transfer of data at the second class user, adopts identical circulating prefix-length in described special clean culture time quantum; Identical antenna configurations and the polarization mode of the preferential employing of each node in the described collaborative set.
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