WO2010034189A1 - Système et procédé de transmission multipoint coopérative - Google Patents

Système et procédé de transmission multipoint coopérative Download PDF

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Publication number
WO2010034189A1
WO2010034189A1 PCT/CN2009/070432 CN2009070432W WO2010034189A1 WO 2010034189 A1 WO2010034189 A1 WO 2010034189A1 CN 2009070432 W CN2009070432 W CN 2009070432W WO 2010034189 A1 WO2010034189 A1 WO 2010034189A1
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WIPO (PCT)
Prior art keywords
pilot
mapping
node
port
antenna port
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PCT/CN2009/070432
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English (en)
Chinese (zh)
Inventor
孙云锋
姜静
赵楠
张颖光
毕峰
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中兴通讯股份有限公司
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Publication of WO2010034189A1 publication Critical patent/WO2010034189A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a multipoint coordinated transmission system and method.
  • LTE-Advance Long-Term Evolution advance
  • Super 3G technology also known as International Mobile Telecommunication advance, Referred to as IMT-Advance, etc.
  • cooperative MIMO Multiple Input Multiple Output Multiple Output
  • Interference interference there are three main methods for handling interference at the edge of a cell in LTE: 1. Interference interference; 2. Interference cancellation; 3. Interference coordination (avoidance).
  • the method of interference randomization generally uses frequency hopping, time hopping, direct spreading or code hopping to mitigate the influence of interference between cells. Its advantage is that no network planning is required, and almost no signaling support is needed, but only The interference is mitigated and not completely eliminated.
  • the method of interference cancellation can use some algorithms to eliminate interference, it usually requires additional physical entities, such as multi-antenna technology, to complete the better elimination of interference.
  • the last major method of interference coordination is to exchange some information between cells, and use some algorithms to make each cell automatically select appropriate resources according to the feedback information of other cells and its own situation. Transmission, so as to achieve efficient use of inter-cell resources, and minimize the opportunity for resource collision and utilization between cells, and finally achieve the improvement of cell edge performance, which emphasizes avoiding inter-cell contention for the same time-frequency resources and causing interference.
  • Each BS can serve one or more MSs simultaneously on the same radio resource.
  • each company has put forward their own views on the basis of LTE based on CoMP.
  • the antenna ports in the cell are mainly divided into cell-specific (cell-specific) antenna port 0-3 (antenna port 0 ⁇ 3).
  • MBMS Multimedia Broadcast Multicast Service
  • the main discussion is the design of multi-antenna algorithm-related schemes, including Alcatel-Lucent's zero-based uplink cooperative MIMO and beamforming-based cooperative MIMO.
  • the above scheme is mainly based on a cooperative method considered in the case where the pilots of the respective cooperative nodes are orthogonal. If the pilots are completely orthogonal, the resources used to transmit data for the target UE will be greatly reduced, and if the orthogonality is maintained by means of code division, the target UE needs to obtain each through a very complicated channel estimation algorithm. Coordinate node channel information and feedback, as shown in Figure 1. As can be seen from Figure 1, in LTE, pilots of different cells are avoided by frequency offset.
  • the conflict will affect the accuracy of channel estimation and the performance of data detection.
  • the complexity of the algorithm may be high, especially in a plurality of cell cooperation scenarios. For power-constrained terminals, this is certainly not a good design approach.
  • Another way is to newly define a user-specific antenna port. All nodes cooperate to insert pilots according to the pilot pattern on the port to implement air interface merging. However, this situation introduces pilot interference. , as shown in picture 2.
  • picture 2. it is assumed that A and D are respectively serving cells in different cooperation domains. When A and D cooperate in different resources in the same resource, and the selected cooperative nodes are ABC and DEF respectively, due to all Nodes use the same port, and If the same pilot mapping method is used, the pilot of the node E will interfere with the channel estimation of the ABC cooperative domain.
  • the solution is to perform a large amount of information interaction between cells, notify the surrounding nodes of the resource usage of the node, and not only need to notify the neighboring node to neighboring nodes, but also need to directly or indirectly notify the outer layer cell, but this will greatly increase The amount of signaling interaction.
  • the technical problem to be solved by the present invention is to address the shortcomings of the above methods, and consider the problem of upward compatibility of the system, and provide a multi-point cooperative transmission system and method, so that the UE can obtain spatial gain through simple air interface merging. At the same time, avoid interference problems of users at the edge of the cell.
  • the technical solution adopted by the present invention is a multi-point cooperative transmission method, including:
  • the antenna port characteristics of the serving node where the target terminal is located are subjected to pilot mapping and data mapping, and then the mapped information is sent to the target terminal at the cooperation node.
  • pilot mapping and data mapping of each of the cooperative nodes according to the antenna port characteristics of the serving node where the target terminal is located refers to:
  • Each of the cooperative nodes performs pilot mapping and data mapping according to the port characteristics of the cell-specific antenna port of the serving node where the target terminal is located;
  • Each of the cooperative nodes performs pilot mapping and data mapping according to the port characteristics of the user-specific antenna port of the serving node where the target terminal is located.
  • each of the cooperative nodes performs pilot mapping and data mapping according to the port characteristics of the cell-specific antenna port of the serving node where the target terminal is located, specifically:
  • all the cooperative nodes When there is only one cell-specific antenna port in the serving node where the target terminal is located, all the cooperative nodes perform pilot mapping and data mapping according to the port characteristics of the specific antenna port of the cell; when there are multiple cells in the serving node where the target terminal is located.
  • multiple cooperative nodes respectively perform pilot mapping and data mapping according to port characteristics of different cell-specific antenna ports, or group multiple cooperative nodes, and different cooperative node packets are respectively according to different cell-specific antennas.
  • the port characteristics of the port are used for pilot mapping and data mapping.
  • the plurality of cooperative nodes respectively perform pilot mapping and data mapping according to port characteristics of antenna ports specific to different cells, the data and the pilot are transmitted in the form of beamforming.
  • each of the cooperative nodes performs pilot mapping and data mapping according to the port characteristics of the user-specific antenna port of the serving node where the target terminal is located, specifically:
  • all the cooperative nodes When there is only one user-specific antenna port in the service node where the target terminal is located, all the cooperative nodes perform pilot mapping and data mapping according to the port characteristics of the specific antenna port of the user; when there are multiple users in the service node where the target terminal is located For a specific antenna port, multiple cooperative nodes perform pilot mapping and data mapping for pilot mapping and port characteristics of the data mapping port according to port characteristics of different user-specific antenna ports.
  • pilot mapping performed by each coordinated node according to the antenna port characteristics described in the serving node where the target terminal is located specifically refers to:
  • Each cooperating node calculates a pilot position and a pilot sequence of the mapped antenna port, and then inserts a pilot according to the calculated pilot position and pilot sequence;
  • Each cooperating node calculates a pilot position and a pilot sequence of the mapped antenna port, then linearly transforms the pilot sequence, and finally inserts a linearly transformed pilot sequence at the pilot position.
  • linear transformation mode is cyclic delay diversity, or phase rotation diversity.
  • each of the cooperative nodes performs the same linear transformation on the data as the pilot at the time of data mapping. Further, the method further includes: setting a threshold greater than 1, and allowing the target terminal to perform handover of the serving cell only when the ratio of the power of the coordinated node to the power of the serving node is greater than or equal to the threshold.
  • the present invention also provides a multipoint coordinated transmission system, including: one or more collaboration nodes and service nodes;
  • the cooperation node is configured to perform pilot mapping and data mapping according to the antenna port characteristics of the serving node where the target terminal is located in the current cooperation, and send the mapped information to the target terminal in the collaboration node.
  • pilot mapping and data mapping performed by each coordinated node according to the antenna port characteristics of the serving node where the target terminal is located refers to: Each of the cooperative nodes performs pilot mapping and data mapping according to the port characteristics of the cell-specific antenna port of the serving node where the target terminal is located; or
  • Each of the cooperative nodes performs pilot mapping and data mapping according to the port characteristics of the user-specific antenna port of the serving node where the target terminal is located.
  • pilot mapping and data mapping of each of the cooperative nodes according to the port characteristics of the cell-specific antenna port of the serving node where the target terminal is located specifically refers to:
  • all the cooperative nodes When there is only one cell-specific antenna port in the serving node where the target terminal is located, all the cooperative nodes perform pilot mapping and data mapping according to the port characteristics of the specific antenna port of the cell; when there are multiple cells in the serving node where the target terminal is located.
  • multiple cooperative nodes respectively perform pilot mapping and data mapping according to port characteristics of different cell-specific antenna ports, or group multiple cooperative nodes, and different cooperative node packets are respectively according to different cell-specific antennas.
  • the port characteristics of the port are used for pilot mapping and data mapping.
  • pilot mapping and data mapping of each of the cooperative nodes according to the port characteristics of the user-specific antenna port of the serving node where the target terminal is located specifically refers to:
  • all the cooperative nodes When there is only one user-specific antenna port in the service node where the target terminal is located, all the cooperative nodes perform pilot mapping and data mapping according to the port characteristics of the specific antenna port of the user; when there are multiple users in the service node where the target terminal is located For a specific antenna port, multiple cooperative nodes perform pilot mapping and data mapping for pilot mapping and port characteristics of the data mapping port according to port characteristics of different user-specific antenna ports.
  • pilot mapping performed by each coordinated node according to the antenna port characteristics described in the serving node where the target terminal is located specifically refers to:
  • Each cooperating node calculates a pilot position and a pilot sequence of the mapped antenna port, and inserts a pilot according to the calculated pilot position and pilot sequence;
  • Each cooperating node calculates a pilot position and a pilot sequence of the mapped antenna port, and linearly transforms the pilot sequence, and inserts a linearly transformed pilot sequence at the pilot position.
  • the technical solution of the present invention can enable the UE to obtain performance gain through simple air interface combining.
  • the pilot can be avoided by mapping the pilot and the data according to the antenna port of the serving cell. The problem is highlighted, and the problem of excessive computational complexity of the UE is avoided.
  • a normal UE within each coordinated node can perform channel estimation and channel measurement in full bandwidth.
  • Figure 1 (a) and (b) are schematic diagrams of pilot patterns of neighboring cells in LTE;
  • FIG. 2 is a schematic diagram of interference caused when all coordinated cells are processed according to the same antenna port characteristics;
  • FIG. 3 is a schematic diagram corresponding to the invention corresponding to LTE;
  • FIG. 4 is a schematic diagram of a cooperative node mapping to a plurality of antenna ports in a fixed mode according to the present invention
  • FIG. 5 is a schematic diagram of a specific implementation process of an application example 1 of the present invention
  • FIG. 6 is a schematic diagram of mapping of a cooperative node according to a service node user-specific antenna port in Application Example 1;
  • FIG. 7 is a schematic diagram of a cooperation node according to a service node cell-specific antenna port mapping in the application example 2.
  • the present invention provides a multi-point coordinated transmission system and method, and is applicable to multiple points in an inter-cell cooperative MIMO mode in an LTE-A system, in consideration of the problems existing in the above existing solutions, and considering the forward compatibility characteristics of the system. Collaborative transfer.
  • the multi-point coordinated transmission system includes a network side, a service node, one or more cooperation nodes, and a target UE;
  • the network side is used to select a collaboration node for the target UE; the cooperative node may be selected according to the measurement information and the resource allocation of the neighboring node and the load condition thereof; the specific method is the same as the prior art.
  • the network side is also used to notify each cooperating node of the cell identity of the serving node where the target UE is located in the current cooperation; wherein the network element used by the network side to select the cooperating node for the target UE can be placed in the serving node.
  • each coordinated node After receiving the cell identifier of the serving node where the UE is located, each coordinated node performs pilot mapping and data mapping according to the antenna port characteristics of the serving node where the target UE is located in the current cooperation;
  • Each of the cooperative nodes may perform pilot mapping and data mapping according to the port characteristics of the cell-specific (cell-specific) antenna port of the serving node where the target UE is located in the current cooperation; each collaboration node may also separately collaborate according to this collaboration.
  • the port characteristics of the user-specific (user-specific) antenna port of the serving node where the target UE is located are subjected to pilot mapping and data mapping.
  • all the cooperative nodes When there is only one cell-specific antenna port in the serving node where the target UE is located, all the cooperative nodes perform pilot mapping and data mapping according to the port characteristics of the cell-specific antenna port; when there are many service nodes where the target UE is located.
  • a cell-specific antenna port When a cell-specific antenna port is used, multiple cooperative nodes perform pilot mapping and data mapping according to port characteristics of different cell-specific antenna ports, or group multiple cooperative nodes, and different cooperative nodes are grouped according to different The port characteristics of the cell-specific antenna port are used for pilot mapping and data mapping.
  • all the cooperative nodes When there is only one user-specific antenna port in the serving node where the target UE is located, all the cooperative nodes perform pilot mapping and data mapping according to the port characteristics of the user-specific antenna port; when there are many service nodes where the target UE is located.
  • a user-specific antenna port When a user-specific antenna port is used, multiple cooperative nodes perform pilot mapping and data mapping according to port characteristics of different user-specific antenna ports, or group cooperative nodes, and different cooperative nodes are grouped according to different user- The port characteristics of the specific antenna port are used for pilot mapping and data mapping.
  • Each of the cooperative nodes performs pilot mapping according to the characteristics of the antenna port in the serving node where the target UE is located. Specifically, it refers to:
  • Each coordinated node calculates a pilot position and a pilot sequence of the mapped antenna port, and inserts a pilot according to the calculated pilot position and pilot sequence; or each coordinated node calculates a pilot of the mapped antenna port
  • the position and pilot sequences, and the pilot sequence are linearly transformed, and the linearly transformed pilot sequence is inserted at the pilot position.
  • Each collaboration node can also be used to perform the same linear transformation of the data as the pilot during data mapping. Change.
  • Each coordinated node is further configured to send the mapped information (including the mapped data and pilots after the mapped information is mapped) to the target UE in the coordinated node.
  • the serving node is configured to perform pilot mapping and data mapping according to the antenna port characteristics of the node, and send the mapped information to the target UE on the antenna of the node (the mapped information includes the mapped data and the pilot).
  • the specific operation is the same as the prior art.
  • the multi-point coordinated transmission method provided by the present invention includes: performing pilot mapping and data mapping on the antenna port characteristics of the serving node where the UE is located, and mapping and transmitting to the target UE at the cooperative node.
  • the cooperative node is used to assist the serving node where the target UE is located in the primary CoMP transmission, and serves the target UE together; that is, the serving node and each coordinated node of the target UE are on the same radio resource. Collaboration, jointly sending signals to the target UE.
  • the network side can select the cooperative node according to the measurement information and the resource allocation of the neighboring node and its load condition; the selection can be performed according to the existing existing modes.
  • the antenna port characteristics include a pilot pattern corresponding to the antenna port, a pilot sequence, a data mapping method, and related information.
  • each coordinated node may perform pilot mapping and data mapping according to the port characteristics of the cell-specific antenna of the serving node where the target UE is located in the current cooperation; each coordinated node may also be separated.
  • the pilot mapping and data mapping are performed according to the port characteristics of the user-specific (user-specific) antenna port of the serving node where the target UE is located in this collaboration.
  • each cooperative node is not limited to mapping according to the above two antenna port characteristics.
  • performing pilot mapping and data mapping according to the port characteristics of the cell-specific antenna port of the serving node where the target UE is located may be:
  • all the cooperative nodes may perform pilot mapping according to the port characteristics of the cell-specific antenna port.
  • multiple cooperative nodes may perform pilot mapping and data mapping according to the port characteristics of different cell-specific antenna ports, that is, the cooperative node and the cell-specific Antenna port—corresponding to mapping.
  • data and pilot can be mapped in the form of beamforming beamforming; multiple cooperative nodes can also be grouped, and different cooperative node groups are respectively according to different cell-specific antennas.
  • the port characteristics of the port are used for pilot mapping and data mapping, that is, multiple cooperative nodes are mapped corresponding to one cell-specific antenna port; that is, a cell-specific antenna port may correspond to one cooperative node, or may correspond to multiple Collaboration nodes.
  • the pilot mapping and data mapping by which the cooperative node performs the pilot port may be dynamically specified by the network side, or may be specified according to a fixed rule or a prescribed rule, such as grouping by the parity of the node ID.
  • performing pilot mapping and data mapping according to the port characteristics of the user-specific antenna port of the serving node where the target UE is located may be:
  • all the cooperative nodes may perform pilot mapping and data mapping according to the port characteristics of the user-specific antenna port;
  • the system may also set multiple user-specific antenna ports.
  • multiple cooperative nodes may be respectively according to different user-specific The port characteristics of the antenna port are used for pilot mapping and data mapping, and the cooperative nodes may also be grouped. Different cooperative node groups perform pilot mapping and data mapping according to port characteristics of different user-specific antenna ports respectively; which antenna port the cooperative node according to The pilot mapping and data mapping may be dynamically specified, or may be mapped according to a fixed rule or an agreed rule.
  • the number of user-specific antenna ports is 2, it may be, but is not limited to, a cooperative node with an odd node ID and a cooperative node with an even node ID, respectively, performing pilot mapping and data mapping according to port characteristics of different ports (eg, The odd cooperative nodes are mapped to port 1, and the even nodes are mapped to port 2, thereby reducing signaling overhead between nodes).
  • different user-specific antenna ports or different cell-specific antenna ports respectively transmit signals of signals processed by multiple antennas.
  • multi-antenna processing methods that can be used include space-frequency processing, space-time processing, space-time frequency Processing, SU-MIMO (single-user multiple input multiple output) processing, MU-MIMO (multi-user multiple input multiple output) processing, precoding precoding, beamforming, Alamouti processing, but not limited to the above.
  • the pilot mapping performed by each coordinated node according to the antenna port feature of the serving node where the target UE is located in the current cooperation may be:
  • Each coordinated node calculates a pilot position (which may also be a pilot pattern) and a pilot sequence of an antenna port of a serving node where the target UE is located;
  • Each cooperating node inserts a pilot according to the calculated pilot position and pilot sequence, that is, inserts a pilot sequence at the pilot position.
  • the pilot mapping performed by each coordinated node according to the antenna port feature of the serving node where the target UE is located in the current cooperation may also be:
  • Each coordinated node calculates a pilot position (also referred to as a pilot pattern) and a pilot sequence of an antenna port of a serving node where the target UE is located;
  • Each of the cooperative nodes performs linear transformation on the pilot sequence, such as CDD (Cyclic Delay Diversity), PSD (Phase Rotation Diversity), or other types of linear transformation, and may also be other types of linear transformation. Other forms of transformation are used; the manner and parameters of transformation by each collaboration node may be the same or different;
  • Each cooperating node inserts a linearly transformed pilot sequence at the pilot position.
  • each cooperative node inserting a pilot sequence (or a linearly transformed pilot sequence) according to the pilot pattern of the corresponding port of the serving node are as follows: (1) The UE can receive data according to the air interface combination. (2) It is also possible to avoid pilot conflicts in other cooperative domains due to the use of the same pilot pattern in different cooperation domains. (3) Since the common pilots and dedicated pilots of different cells are often orthogonal. Between the common pilot and the common pilot of the neighboring cell, the dedicated pilot and the dedicated pilot are also orthogonal, which can avoid mutual pollution (interference) between the pilots in the cooperative scenario, and thus for each coordinated node Different UEs will not affect their channel feedback over the entire bandwidth.
  • the node may perform the same CDD processing on the data during data mapping, or may not perform CDD processing. Of course, the same is true when performing PSD or other linear transformation; if CDD processing is not performed, the network side notifies the target UE through control signaling.
  • the amount of CDD is, but not limited to, this processing method.
  • Other processing methods include diversity processing on the antenna port, SU-MIMO processing, and MU-MIMO processing.
  • a threshold greater than 1 can be set, only when the UE measures a certain collaboration.
  • the target UE is allowed to perform handover, thereby avoiding frequent changes of the serving cell.
  • other threshold determination methods may be used in practical applications, such as determining whether to switch by comparing the power difference with the threshold, or when the ratio of the power of the serving node to the power of a cooperative node is less than or equal to the set threshold.
  • the target UE is the CoMP of UE A, and its serving node cell #3 (this is a simplified description, the cell with the ID n is described in the form of cell #n) and the cooperative node ce ll #0, collaboration.
  • the node cell #1 and the coordinating node cell #2 form a cooperative domain 1 together;
  • the target UE is the CoMP of the UE B, and the serving node cell #8 and the cooperative node cell #4, the cooperative node cell #6, and the cooperative node cell #7 share Composing the cooperation domain 2; in the two cooperation domains, each of the cooperation nodes performs data mapping and pilot mapping according to the port characteristics of the antenna port 5 of the service node in the collaboration domain (that is, the service node where the target UE is located in the current CoMP) And transmitting the mapped data and pilots to the corresponding UE.
  • the pilot positions in different cooperation domains are consistent according to the service nodes, and the different service nodes are as orthogonal as possible, the interference problem of the pilots can be avoided.
  • the nodes herein include any one or more of the following: a cell, a base station, a relay station, and the like.
  • the pilot node performs pilot mapping and data mapping according to the characteristics of an antenna port
  • mapping to the antenna port according to a fixed pattern that is, which antenna port the pilot node performs pilot mapping and data mapping is fixed.
  • the node ID is used as the identifier, and the number of ports is 2, the cell ID is oddly mapped to the first port, and the node with the cell ID is evenly mapped to the second port.
  • two Alamouti-encoded signals are transmitted on the two antenna ports, respectively.
  • the application example 1 is given below, and the flow thereof is as shown in FIG. 5, which is described in conjunction with the antenna port already defined in the current LTE.
  • antenna port 5 In current LTE, a user-specific single antenna port 5 is defined.
  • One method is that the cooperative node maps according to the antenna port 5 of the serving node.
  • the characteristics of the so-called antenna port 5 in LTE are: antenna port 5 is user-specific and exists only in the resource block used by the user; antenna port 5 corresponds to one or more physical antennas, and multiple physical antennas are beamformed. The weight is mapped to antenna port 5.
  • the network side selects the cooperative node according to the measurement information and the resource allocation of the neighboring node and its load.
  • the measurement information may be signal fading information or power information of each node measured by the UE and reported by the UE, or may be UE location information measured by the network side according to the uplink signal; but is not limited to the above two types of information.
  • the preferred principle is to select a node that has resources that are idle and lightly loaded.
  • the service node may consider not to select the node to participate in the cooperation when selecting the cooperative node.
  • the network side notifies the coordinating node, the cell identifier of the serving node where the target UE is located in the cooperation, and the coordinating node performs pilot mapping according to the antenna port 5 of the serving node where the target UE is located.
  • antenna port 5 is user-specific, and only the pilot signal of user-specifc exists on the resource using the port.
  • the cooperating node can calculate the user-specific pilot position and pilot sequence in the service node antenna port 5 according to the identity of the serving node.
  • the cooperative node inserts the pilot according to the calculated user-specific pilot position and pilot sequence.
  • the antenna port 5 is not extended.
  • the cell Cell #1 is assumed to be the serving cell in which the UE is located, and the cell Cell #2 is the reference.
  • the pilot pattern of the user-specific antenna port of the cell Cell#2 is inserted into the pilot sequence according to the pilot pattern of the user-specific antenna port in the cell Cell#1.
  • the data is processed in the same mode as the pilot sequence, and then mapped to the corresponding subcarrier for transmission.
  • the pilot is linearly transformed in the manner of PSD.
  • the collaboration node performs the same processing on the data and performs data mapping.
  • a linear transformation is a method using CDD. Specifically, first, according to the pilot pattern of the service node and The pilot sequence is inserted while mapping the data to the corresponding location of the subcarriers. After the IFFT (Fast Inverse Fourier Transform), the loop delay processing is performed, and then the loop prefix is added.
  • IFFT Fast Inverse Fourier Transform
  • the mapped information (including the mapped data and the pilot) is sent. After the transmitted signals of different cooperative nodes are combined in the air interface, the receiver performs reception detection.
  • Application example 2 The difference from the application example 1 is that after the cooperation node obtains the ID of the serving node, the pilot pattern corresponding to the cell-specific antenna port of the serving cell and the pilot sequence of the corresponding port are calculated; further, according to the calculation The pilot pattern corresponding to the mapped cell-specific antenna port is inserted into the calculated pilot sequence corresponding to the antenna port as a pilot pattern of the user-specific antenna port of the cooperative node in the cooperative resource.
  • Cell #2 can obtain the pilot pattern of the cell-specific antenna port corresponding to Cell #1 and the pilot sequence corresponding to the resource according to the cell ID of Cell #1.
  • the coordinated cell Cell #2 will be mapped to the antenna port 1 of the Cell #1, and then the Cell # 2 will be based on the pilot sequence of the cell-specific antenna port 1 of the Cell #1 in the resource.
  • the Cell # 2 will be based on the pilot sequence of the cell-specific antenna port 1 of the Cell #1 in the resource.
  • a user-specific sequence within Cell #2 inserted into cell #1 port 1 Corresponding pilot position.
  • the system can set multiple user-specific ports. When there are multiple user-specific ports, it can be mapped to different ports of the service node in a fixed mode. Assume that the number of user-specific ports is 2, which are the first port and the second port, respectively.
  • the node ID is used to identify the node into two types, two types of nodes; the cell ID is oddly mapped to the first port, and the node with the even cell ID is mapped to the second port.
  • two signals of Alamouti encoding are respectively transmitted on the two ports.
  • the serving node cell #0 cooperates with the cooperative node cell #1 and the cooperative node cell #2, and services node cell # 0 and the cell # 2 are cooperative node transmits [Sl '_s;], cooperating nodes transmit cell # l [S2' s:].
  • the technical solution of the present invention can enable the UE to obtain performance gain through simple air interface combining. Moreover, by performing pilot and data mapping according to the antenna port of the serving cell, the pilot conflict problem can be avoided, and the problem of excessive computational complexity of the UE is avoided.
  • a normal UE within each coordinated node can perform channel estimation and channel measurement within the full bandwidth.

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Abstract

Cette invention se rapporte à un système et à un procédé de transmission multipoint coopérative. Le procédé comprend une étape selon laquelle, dans la transmission multipoint coopérative, chaque nœud coopératif qui participe à la coopération exécute un mappage de pilote et un mappage de données respectivement selon les caractéristiques du port d'antenne du nœud de service où le terminal cible de la coopération se situe. Ensuite, les informations mappées sont envoyées par le nœud coopératif au terminal cible. Le système comprend un ou plusieurs nœuds coopératifs et nœuds de service. Le nœud coopératif exécute un mappage de pilote et un mappage de données selon les caractéristiques du port d'antenne du nœud de service où le terminal cible de la coopération se situe. Les données mappées sont envoyées par le nœud coopératif au terminal cible.
PCT/CN2009/070432 2008-09-24 2009-02-13 Système et procédé de transmission multipoint coopérative WO2010034189A1 (fr)

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CN102545985B (zh) * 2012-01-13 2014-05-07 电信科学技术研究院 协作多点传输中的干扰规避方法和装置
CN103684667B (zh) * 2012-09-14 2017-02-08 上海贝尔股份有限公司 在异构通信***中发送和接收控制信道上的数据的方法
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CN105517108B (zh) 2014-09-26 2019-03-22 电信科学技术研究院 一种小区接入方法及装置
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