WO2010081426A1

WO2010081426A1 - Multi-cell cooperative data transmission method, system and device thereof

Info

Publication number: WO2010081426A1
Application number: PCT/CN2010/070210
Authority: WO
Inventors: 高秋彬; 缪德山; 肖国军
Original assignee: 大唐移动通信设备有限公司
Priority date: 2009-01-16
Filing date: 2010-01-15
Publication date: 2010-07-22
Also published as: CN101784114B; CN101784114A

Abstract

The present invention provides a multi-cell cooperative data transmission method. The method includes: the aggregate of cooperative cells of a UE (User Equipment) is obtained; a network side device allocates time and frequency resources for said UE, and determines the time domain initial locations for resource mapping of each cooperative cell according to the number of the OFDM (Orthogonal Frequency Division Multiplexing) symbols occupied by the control channels, wherein the determined time domain initial locations for resource mapping of each cooperative cell are the same; the network side device determines the available RE (Resource Element) according to the time domain initial locations for resource mapping, and each cooperative cell in turn maps the data symbols to the available REs from the time domain initial position for resource mapping in order to send them. With the present invention, the problem of resource mapping during multi-cell cooperative transmission can be solved.

Description

Multi-cell coordinated data transmission method, system and device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a multi-cell coordinated data transmission method, system and apparatus. Background technique

The ITU (International Telecommunication Union) has placed very stringent requirements on the performance of the next generation mobile communication system, IMT-Advanced (Broadband Mobile Telecommunications System). For example, the maximum system transmission bandwidth reaches 100MHz, and the peak rates of uplink and downlink data transmission need to reach 500M bps and IGbps, respectively, and put a very high demand on the average spectrum efficiency of the system, especially the edge spectrum efficiency. In order to meet the requirements of the new IMT-Advanced system, 3GPP proposed multi-point coordinated transmission technology to improve system performance in its next-generation mobile cellular communication system LTE-Advanced. The multipoint coordinated transmission technology is a cooperation between a plurality of geographically separated transmission points. Generally, a plurality of transmission points are base stations of different cells. Multi-point coordinated transmission technology solutions are mainly divided into two categories: joint scheduling and joint transmission. Joint scheduling is to allocate mutually orthogonal resources to different UEs by coordinating time, frequency and space resources between cells to avoid mutual interference.

Different from the joint scheduling scheme, only one cell sends data to the UE (User Equipment). In the joint transmission scheme, multiple cells simultaneously send data to the UE to enhance the UE receiving signals. As shown in FIG. 1 , a schematic diagram of sending data to one UE on the same resource by three cells in the prior art, as shown in the figure, the UE simultaneously receives signals of multiple cells. In this way, on the one hand, the useful signal superposition from multiple cells can improve the signal quality received by the UE, and on the other hand, the interference received by the UE is reduced, thereby improving system performance. However, in the existing LTE (Long Term Evolution) system, the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols occupied by the control channels of different cells may be different, and the common pilot may occupy different RE (Resource Element), as shown in FIG. 2A and FIG. 2B, respectively, is a home cell of the UE in the prior art and other coordinated cells. A resource map, where R0 and R1 are the common pilot positions of antenna port 0 and antenna port 1, respectively. It can be seen from the figure that the control channel and the common pilot position of the home cell are different from the control channel and the common pilot position of other coordinated cells, that is, the RE of the data can be transmitted in the home cell, in other synergies. The cell may be occupied and cannot transfer data. Therefore, the problem of resource mapping of multi-cell coordination of the joint transmission scheme in the LTE-A system becomes an urgent problem to be solved. Summary of the invention

The object of the present invention is to solve at least the above technical deficiencies, and in particular to solve the resource mapping scheme without corresponding multi-cell coordination in the joint transmission scheme in the existing LTE-A system.

To achieve the above objective, an embodiment of the present invention provides a multi-cell coordinated data transmission method, including the following steps: a network side device acquires a coordinated cell set of a user equipment UE; and the network side device allocates a time frequency to the UE a resource, and determining, according to the number of OFDM symbols occupied by each coordinated cell control channel in the coordinated cell set, a time domain start location of the resource mapping of each coordinated cell, where the determined time domain start of the resource mapping of each coordinated cell The location is the same, and the allocated time-frequency resource and the determined time-domain starting position of the resource mapping are notified to the UE; the network-side device determines, according to the time domain starting location of the resource mapping, the available resources of the UE. The unit RE, each of the coordinated cells sequentially maps data symbols to the available REs for transmission from the start of the time domain of the resource mapping.

An embodiment of the present invention further provides a multi-cell coordinated data transmission system, including a UE and a network side device to which the UE belongs, where the network side device is configured to acquire a coordinated cell set of the UE, and The UE allocates time-frequency resources and determines a time domain start position of the resource mapping of each coordinated cell according to the number of OFDM symbols occupied by each coordinated cell control channel in the coordinated cell set, where the determined resource mapping time of each coordinated cell The domain start location is the same, and the allocated time-frequency resource and the determined time-domain start location of the resource mapping are sent to the UE, and the available resources of the UE are determined according to the time domain start location of the resource mapping. a unit RE, each of the coordinated cells, according to the time domain starting position of the resource mapping, mapping the data symbols to the available REs for transmission; the UE is configured to receive the time-frequency resources sent by the network side device And the time domain starting position of the resource mapping, and according to the time domain of the time-frequency resource and resource mapping The starting location receives data transmitted by each coordinated cell.

An embodiment of the present invention further provides a network side device, including a coordinated cell set acquisition module, a time-frequency resource allocation module, a start location determining module, a notification module, and an available RE determining module, where the coordinated cell set acquiring module is configured to Obtaining a coordinated cell set of the user equipment UE, the time-frequency resource allocation module, configured to allocate a time-frequency resource to the UE, and the start location determining module, configured to use, according to the coordinated cell control channel in the coordinated cell set The number of occupied OFDM symbols determines a time domain start position of the resource mapping of each coordinated cell, where the determined time domain start positions of the resource maps of the respective coordinated cells are the same; the notification module is configured to use the time frequency Notifying the UE by the time-frequency resource allocated by the resource allocation module and the time domain start position of the resource mapping determined by the starting location determining module; the available RE determining module, configured to start according to the time domain of the resource mapping Position determining the available REs of the UE, each coordinated cell from the start of the time domain of the resource mapping The data symbols are mapped to the available REs for transmission.

An embodiment of the present invention further provides a base station of a coordinated cell, including an obtaining module and a resource mapping module, where the acquiring module is configured to acquire a time domain starting position of a resource mapping and an available RE of the UE; and a resource mapping module, configured to: Data symbols are mapped to available REs for transmission from the start of the time domain of the resource map.

The embodiment of the present invention further provides a user equipment, including: a location information receiving module, configured to receive a time domain resource and a time domain start location of a resource mapping sent by the network side device, where the resource mapping time of each coordinated cell The data starting module is configured to receive, according to the time domain starting position of the time-frequency resource and the resource mapping, each coordinated cell maps the data symbol to the user equipment in order from the time domain starting position of the resource mapping. The data sent on the resource unit.

The resource mapping problem in multi-cell coordinated transmission can be solved by the present invention, and each coordinated cell can perform resource mapping according to the same rule, so that each coordinated data signal can be directly combined to implement signal enhancement on the UE data, thereby improving the system. performance.

The additional aspects and advantages of the invention will be set forth in part in the description which follows. DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

FIG. 1 is a schematic diagram of three cells in the prior art transmitting data to one UE on the same resource;

2A and 2B are resource mapping diagrams of a home cell and other coordinated cells of a UE in the prior art;

3 is a flow chart of a data transmission method for implementing multi-cell coordination according to an embodiment of the present invention;

4A and 4B are respectively schematic diagrams of resource mapping of a home cell and other coordinated cells of a UE according to an embodiment of the present invention;

5A and 5B are respectively schematic diagrams of resource mapping of a home cell and other coordinated cells of a UE according to another embodiment of the present invention;

6 is a structural diagram of a network side device according to an embodiment of the present invention;

7 is a structural diagram of a base station of a coordinated cell according to an embodiment of the present invention;

FIG. 8 is a structural diagram of a user equipment according to an embodiment of the present invention. Concrete way

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative only and not to be construed as limiting.

The present invention mainly provides that all the coordinated cells of the UE perform resource mapping according to the same rule, that is, each coordinated cell sequentially maps data symbols to available REs from the start of the time domain of the resource mapping, or as the present invention. In another optional embodiment, the common pilot and the data may also be sent simultaneously, where the time domain starting position of the resource mapping and the available RE are uniformly determined by the network side device. In this way, each coordinated cell performs resource mapping according to the same rule, so that each coordinated data signal can be directly combined to implement signal enhancement on the UE data, thereby improving system performance. FIG. 3 is a flowchart of a data transmission method for implementing multi-cell coordination according to the present invention. In this embodiment, the network side device may be a home base station of the terminal, or a base station of the coordinated cell, or a base station control device. Includes the following steps:

Step S301: Determine a coordinated cell set of a certain UE. In the present invention, the coordinated cell set between the network side and the UE may be determined in various manners, for example, the UE may be notified by the UE, or may be notified by the network side. The following description will be made in a specific embodiment manner. .

For example, the UE feeds back the measured pilot signal strength of the surrounding cell and the delay of the detected synchronization signal to the network side, and the network side according to the average value of the pilot signal strength over a period of time or the delay of the synchronization signal or At the same time, it is considered that the two determine a coordinated cell set, and notify the UE of the coordinated cell information in the coordinated cell set. Similarly, the UE may determine the coordinated cell set according to the measured pilot signal strength of the surrounding cell and/or the detected synchronization signal delay, and then the UE transmits the determined coordinated cell information within the coordinated cell set to the network side. The coordinated cell set may be a changed set, which will be updated according to a certain period, and the number of elements in the coordinated cell set is not more than the network preset value M.

Step S302: The network side device allocates time-frequency resources according to the service demand of the UE and the resource occupation status of each coordinated cell in the coordinated cell set, and notifies the UE. As an embodiment of the present invention, the UE may be notified by the downlink control signaling PDCCH of the home cell base station of the UE. And in this embodiment, each of the coordinated cells participating in the coordinated transmission of the UE transmits the same data stream.

Step S303: The network side device determines, according to the number of OFDM symbols occupied by the control channel of each coordinated cell in the coordinated cell set, the time domain start location of the resource mapping of each coordinated cell, where the determined time domain of the resource mapping of each coordinated cell The starting position is the same, and the UE is notified of the determined time domain start position of the resource map.

In the embodiment of the present invention, the time domain start position of the resource mapping of each coordinated cell may be determined in multiple manners. For example, in one embodiment, the cell with the least number of OFDM symbols occupied by the control channel may be used as a reference. In other embodiments, the cell with the largest number of OFDM symbols occupied by the channel may be used as the reference or the home cell of the UE may be used as the reference, so that the data locations of all the coordinated cells are consistent in the time domain. Step S304: The network side device determines, according to the time domain starting position of the resource mapping, the available RE of the UE, where the available RE is an RE from the start of the time domain of the resource mapping until the end of the subframe, including the public The RE occupied by the pilot and the RE occupied by the control channel may also include the RE occupied by the dedicated pilot. However, since the dedicated pilot is required for channel estimation, in order to ensure the accuracy of the dedicated pilot estimation channel, as an embodiment of the present invention, the available RE does not include the RE occupied by the dedicated pilot. Of course, in a real application scenario, only common pilots can be used instead of dedicated pilots, so the REs available in the scenario include the REs occupied by the common pilots.

In order to clarify the present invention, a specific example will be described below on how to determine the start time position of a resource map and the available REs.

As shown in FIG. 4A and FIG. 4B, FIG. 4 is a schematic diagram of resource mapping of a home cell and other coordinated cells of a UE according to an embodiment of the present invention. The dedicated pilot is not included in this embodiment, and R0 and R1 are the pilot positions of antenna port 0 and antenna port 1, respectively. In Figure 4A, the home cell control channel occupies 3 OFDM symbols, the data starts from the 4th symbol, and the other coordinated cell control channels in Figure 4B occupy only 2 OFDM symbols, and the data starts from the 3rd OFDM symbol. In this embodiment, the time domain start position of the resource mapping is used as a reference for the cell with the least OFDM symbol occupied by the control channel, that is, the data is from the third OFDM symbol occupied by the other coordinated cell control channels in FIG. 4B. The OFDM symbols start to map. Thus all REs starting from the 3rd OFDM symbol are considered to be available REs. For example, the area covered by the twill in the figure is the available RE.

As shown in FIG. 5A and FIG. 5B, FIG. 5 is a schematic diagram of resource mapping of a home cell and other coordinated cells of a UE according to another embodiment of the present invention. In this embodiment, the home cell and the other coordinated cell transmit the dedicated pilot R5 that overlaps the location for data demodulation. Also in this embodiment, in FIG. 5A, the home cell control channel occupies 3 OFDM symbols, and the data is from the first The 4 symbols start, while the other coordinated cell control channels in Figure 5B occupy only 2 OFDM symbols, and the data starts from the 3rd OFDM symbol. However, different from the above embodiment, the cell with the most control symbols in this embodiment is used as the reference as the time domain start position of the resource mapping, that is, the mapping starts from the 4th OFDM symbol. Starting from the 4th OFDM symbol, except for the RE occupied by the dedicated pilot, the other REs are regarded as available REs. For example, the area covered by the twill in the figure is the available RE.

Step S305, the network side device according to MCS (Modulation Coding Scheme, modulation) Coding mode) The level and the number of available REs determine the size of the data block. The data is then layer mapped and precoded/beamformed according to the precoding matrix/beamforming vector of each coordinated cell. In this embodiment, the network side device determines the size of the data block according to the number of available REs, and thus can increase the size of the data block, thereby improving the throughput of the system. Conversely, for a fixed data block size, the present invention can also reduce the MCS. Level, which reduces the block error rate.

Step S306, the data of all the antenna ports of all the coordinated cells complete the mapping of the data symbols to the RE according to the same rule, specifically, starting from the starting position of the time domain, and mapping the data symbols to all available REs in order, if If the RE occupied by the control channel of the own cell or the common pilot of the coordinated cell (including the common pilot of all ports) occupies the corresponding data, the corresponding data is punctured (no data is transmitted) or the common pilot and Data is sent simultaneously. If the dedicated pilot is used to estimate the channel, and the RE occupied by the dedicated pilot is not removed when calculating the available RE, the data symbol corresponding to the RE occupied by the dedicated pilot is also punctured or dedicated pilot when performing resource mapping. Send with the data at the same time. The resource unit available to the user equipment may be a remaining resource other than the location of the common pilot signal and the dedicated pilot signal of all the coordinated cells in the resource unit from the start of the time domain of the resource mapping until the end of the subframe. unit. The common pilot signal may be a common pilot signal of the LTE-R8 system and/or a common measurement pilot signal of the LTE-A system.

In order to more clearly understand the above steps, the following description will be made again with reference to the examples of Figs. 4A and 4B and Figs. 5A and 5B.

Referring again to Figures 4A and 4B, each of the cooperating cells punctured the data or simultaneously transmits the common pilot and data if it encounters the RE portion of the common pilot RE and control channel symbols of the own cell. Thus, in addition to the RE occupied by the common pilot RE and the control channel, the UE on each available RE receives the same data transmitted by the two coordinated cells simultaneously. In Figure 4B, other coordinated cells punctate the corresponding data in the last OFDM symbol occupied by the control channel, puncturing the corresponding data at the location of the common pilot RE or simultaneously transmitting the common pilot and data. In Figure 4A, the home cell punctured the corresponding data at the location of the common pilot RE or may simultaneously transmit the common pilot and data. The common pilot positions of the two cells are different, so at least one cell is transmitting data to the UE on each available RE.

Referring again to FIGS. 5A and 5B, each of the cooperative cells encounters the common pilot RE of the cell and The RE occupied by the control channel punctured the data. Thus, in addition to the common pilot RE and the dedicated pilot RE, the UE receives the same data transmitted by the two cells simultaneously on each available RE. At the location of the common pilot RE, the corresponding data is punctured or the common pilot and data can be transmitted simultaneously. At least one cell is transmitting data to the UE on each available RE. The REs occupied by the dedicated pilots of the two cells are not counted as available REs, so no data is mapped to these REs.

Step S307: The network side performs data cooperative transmission according to the mapping result of pilot and data symbols of all antenna ports of all coordinated cells of the UE.

As a preferred solution of the present invention, the coordinated cell needs to consider the interference effect on the other coordinated cells when the resource is mapped. If the RE is the RE occupied by the common pilot of the other coordinated cell, the corresponding data symbol of the RE is played. Hole handling.

The present invention also proposes a multi-cell coordinated data transmission system, including a UE and a network side device to which the UE belongs. The network side device is configured to acquire a coordinated cell set of the UE, and allocate a time-frequency resource to the UE, and determine a time domain start position of the resource mapping of each coordinated cell according to the number of OFDM symbols of the control channel of each coordinated cell in the coordinated cell set, where And determining, by using the determined time domain starting position of the resource mapping of each coordinated cell, sending the allocated time-frequency resource and the determined time domain starting position of the resource mapping to the UE, and starting from the time domain starting position of the resource mapping The available REs of the UE are determined such that each coordinated cell maps the data symbols to the available REs in sequence from the start of the time domain of the resource mapping for transmission. The UE is configured to receive a time domain starting position of the time-frequency resource and the resource mapping sent by the network side device, and receive data sent by each coordinated cell according to the time-frequency resource and the time domain starting position of the resource mapping.

Wherein, in the resource mapping, if the RE is the common pilot or control channel pilot and data of the coordinated cell, the data is simultaneously transmitted.

The network side device may be a home base station of the terminal, or a base station of the coordinated cell, or a base station control device. The available REs are REs from the start of the time domain of the resource mapping to the end of the subframe, and include the RE occupied by the common pilot and the RE occupied by the control channel. In one embodiment of the invention it may comprise an RE occupied by a dedicated pilot. In yet another embodiment, the available REs do not include REs occupied by dedicated pilots. As an embodiment of the present invention, the network side The device is also used to determine the size of the data block based on the MCS level and the number of available REs. The resource unit available to the user equipment may also be the remaining of the common pilot signal of all the coordinated cells and the location of the dedicated pilot signal in the resource unit from the start of the time domain of the resource mapping until the end of the subframe. Resource unit. The common pilot signal may be a common pilot signal of the LTE-R8 system and/or a common measurement pilot signal of the LTE-A system.

FIG. 6 is a structural diagram of a network side device according to an embodiment of the present invention. The network side device 100 includes a coordinated cell set acquisition module 110, a time frequency resource allocation module 120, a home location determining module 130, a notification module 140, and an available RE determining module 150. The coordinated cell set obtaining module 110 is configured to acquire a coordinated cell set of the UE. The time-frequency resource allocation module 120 is configured to allocate time-frequency resources to the UE. The start location determining module 130 is configured to determine a time domain start location of the resource mapping of each coordinated cell according to the number of OFDM symbols of the control channel of each coordinated cell in the coordinated cell set, where the determined resource mapping time of each coordinated cell The starting position of the domain is the same. The notification module 140 is configured to notify the UE of the time-frequency resource allocated by the time-frequency resource allocation module 120 and the time-domain starting position of the resource mapping determined by the starting location determining module 130. The available RE determining module 150 is configured to determine available REs of the UE according to the time domain starting position of the resource mapping, and each coordinated cell sequentially maps data symbols to the available REs to send from the time domain starting position of the resource mapping. .

Wherein, in the resource mapping, if the RE is the common pilot or control channel of the coordinated cell, the pilot and the data are simultaneously transmitted.

The available RE may be an RE from the start of the time domain of the resource mapping to the end of the subframe, including the RE occupied by the common pilot and the RE occupied by the control channel. In one embodiment of the invention it may include an RE occupied by a dedicated pilot. In yet another embodiment, the available RE does not include an RE occupied by a dedicated pilot. The resource unit available to the user equipment may also be the remaining of the common pilot signal of all the coordinated cells and the location of the dedicated pilot signal in the resource unit from the start of the time domain of the resource mapping until the end of the subframe. Resource unit.

The network side device may be a home base station of the terminal, or a base station of the coordinated cell, or a base station control device. The common pilot signal is a common pilot signal of the LTE-R8 system and/or a common measurement pilot signal of the LTE-A system.

As an embodiment of the present invention, the network side device 100 further includes a data block size determining module 160 for determining the size of the data block according to the MCS level and the number of available REs.

FIG. 7 is a structural diagram of a base station of a coordinated cell according to an embodiment of the present invention. The base station 200 includes an acquisition module 210 and a resource mapping module 220. The obtaining module 210 is configured to obtain a time domain starting location of the resource mapping and an available RE of the UE. The resource mapping module 220 is configured to map data symbols to available REs for transmission from the start of the time domain of the resource mapping. In the resource mapping, if the RE is the RE occupied by the common pilot or the control channel of the coordinated cell, if the available RE includes the dedicated pilot, the resource mapping module needs to be used when the resource is mapped. The data symbols corresponding to the REs occupied by the dedicated pilots in the coordinated cell are punctured or the dedicated pilots and data may be simultaneously transmitted.

FIG. 8 is a block diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 8, the user equipment 800 includes: a location information receiving module 810, configured to receive a time domain resource and a time domain start location of a resource mapping sent by a network side device, where a time domain of resource mapping of each coordinated cell The data receiving module 820 is configured to receive, according to the time domain starting position of the time-frequency resource and the resource mapping, each coordinated cell to map the data symbol to the user equipment in order from the time domain starting position of the resource mapping. The data sent on the resource unit.

The available resource unit may be a resource unit from the start of the time domain of the resource mapping to the end of the subframe, including the resource unit occupied by the common pilot and the resource unit occupied by the control channel. The available resource units may not include resource elements occupied by dedicated pilots.

The resource unit available to the user equipment may be the remaining resources except the common pilot signal of all the coordinated cells and the location of the dedicated pilot signal in the resource unit from the time domain start position of the resource mapping until the end of the subframe. unit.

The common pilot signal is a common pilot signal of the LTE-R8 system and/or a common measurement pilot signal of the LTE-A system.

The resource mapping problem in multi-cell coordinated multi-cell coordinated transmission can be solved by the present invention, and each coordinated cell can perform resource mapping according to the same rule, so that each coordinated number According to the signals, they can be directly combined to achieve signal enhancement to the UE data, which improves the performance of the system. While the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art The scope of the invention is defined by the appended claims and their equivalents.

Claims

Claim

A multi-cell coordinated data transmission method, comprising the following steps: The network side device acquires a coordinated cell set of the user equipment;

The network side device allocates a time-frequency resource to the user equipment, and determines a time domain start position of the resource mapping of each coordinated cell according to the number of OFDM symbols occupied by the control channel of each coordinated cell in the coordinated cell set, where Determining, by the determined time domain, the time domain starting position of the resource mapping of each coordinated cell, and notifying the user equipment of the allocated time-frequency resource and the determined time domain starting position of the resource mapping;

Determining, by the network side device, the resource units available to the user equipment according to the time domain start position of the resource mapping, where each coordinated cell maps data symbols to the available information in sequence from the time domain starting position of the resource mapping Send on the resource unit.

The multi-cell coordinated data transmission method according to claim 1, wherein after determining the resource unit available to the user equipment according to the time domain start position of the resource mapping, the method further includes:

The network side device determines the size of the data block according to the modulation coding mode MCS level and the number of available resource units.

The multi-cell coordinated data transmission method according to claim 1, wherein, in resource mapping, if the resource unit is a resource unit occupied by a common pilot or control channel of the coordinated cell, The corresponding data symbols at the resource unit are punctured or the common pilot and data are simultaneously transmitted.

The multi-cell coordinated data transmission method according to any one of claims 1 to 3, wherein the available resource unit is from a time domain start position of the resource mapping until a subframe end The resource unit includes a resource unit occupied by the common pilot and a resource unit occupied by the control channel.

The multi-cell coordinated data transmission method according to claim 4, further comprising: if the resource unit is a resource unit occupied by a common pilot of another coordinated cell during resource mapping, the resource unit The corresponding data symbols are punctured.

The multi-cell coordinated data transmission method according to claim 4, wherein the available resource unit does not include a resource unit occupied by a dedicated pilot.

The multi-cell coordinated data transmission method according to claim 4, wherein, if the available resource unit includes a dedicated pilot, in the resource mapping, each coordinated cell further needs to be in the coordinated cell. The corresponding data symbols at the resource unit occupied by the dedicated pilot are punctured or the dedicated pilot and data are simultaneously transmitted.

The multi-cell coordinated data transmission method according to claim 1 or 2, wherein the resource unit available to the user equipment is a resource from a start time position of the resource mapping to a end of a subframe. The remaining resource units in the unit except the location of the common pilot signal and the dedicated pilot signal of all the coordinated cells.

The multi-cell coordinated data transmission method according to claim 1, wherein the acquiring, by the network side device, the coordinated cell set of the user equipment comprises:

Transmitting, by the user equipment, the pilot signal strength of the measured neighboring cell and/or the detected synchronization signal delay to the network side device, where the network side device is configured according to the pilot signal strength sent by the user equipment And/or the synchronization signal delay determines the coordinated cell, and then sends information of each coordinated cell to the user equipment.

And determining, by the user equipment, the coordinated cell according to the measured pilot signal strength of the surrounding cell and/or the detected synchronization signal delay, and then sending information of each coordinated cell to the network side device.

The multi-cell coordinated data transmission method according to claim 1, wherein the network side device is a home base station of the terminal, or a base station of a coordinated cell, or a base station control device to which the base station belongs.

The multi-cell coordinated data transmission method according to any one of claims 1 to 3, wherein the common pilot signal is a common pilot signal of an LTE-R8 system and/or an LTE-A system. Common measurement pilot signals.

A multi-cell coordinated data transmission system, comprising: a user equipment and a network side device to which the user equipment belongs, where The network side device is configured to acquire a coordinated cell set of the user equipment, allocate time-frequency resources to the user equipment, and determine each coordinated cell according to the number of OFDM symbols occupied by each coordinated cell control channel in the coordinated cell set. a time domain start position of the resource mapping, where the determined time domain start positions of the resource maps of the respective coordinated cells are the same, and the allocated time-frequency resources and the determined time domain start position of the resource map are sent to the Determining the user equipment, and determining available resource units of the user equipment according to the time domain starting position of the resource mapping, each coordinated cell mapping data symbols to the data sequence from the time domain starting position of the resource mapping Send on the available resource unit;

The user equipment is configured to receive a time domain start position of the time-frequency resource and the resource mapping sent by the network side device, and receive, according to the time-frequency resource and the time domain start position of the resource mapping, the sending by each coordinated cell. data.

The multi-cell coordinated data transmission system according to claim 13, wherein the network side device is further configured to determine a size of the data block according to the MCS level and available resource units.

The multi-cell coordinated data transmission system according to claim 13, wherein, in resource mapping, if the resource unit is a resource unit occupied by a common pilot or control channel of the coordinated cell, The corresponding data symbols at the resource unit are punctured or the common pilot and data are simultaneously transmitted.

The multi-cell coordinated data transmission system according to claim 13 or 14, wherein the available resource unit is a resource unit from a start time position of the resource mapping to a end of a subframe, The resource unit occupied by the common pilot and the resource unit occupied by the control channel are included.

The multi-cell coordinated data transmission system according to claim 16, wherein the available resource unit does not include a resource unit occupied by a dedicated pilot.

The multi-cell coordinated data transmission system according to claim 13 or 14, wherein the resource unit available to the user equipment is a resource from a start time position of the resource mapping to a subframe end. The remaining resource units in the unit except the location of the common pilot signal and the dedicated pilot signal of all the coordinated cells.

19. A multi-cell coordinated data transmission system according to any one of claims 13 to 15, The network side device is a home base station of the terminal, or a base station of a coordinated cell, or a base station control device.

The multi-cell coordinated data transmission system according to claim 13 or 14, wherein the common pilot signal is a common pilot signal of the LTE-R8 system and/or a common measurement guide of the LTE-A system. Frequency signal.

A network-side device, comprising: a coordinated cell set acquisition module, a time-frequency resource allocation module, a start location determining module, a notification module, and an available resource unit determining module, where

The coordinated cell set obtaining module is configured to acquire a coordinated cell set of the user equipment, and the time-frequency resource allocation module is configured to allocate a time-frequency resource to the user equipment, where the starting location determining module is configured to perform Determining, by the number of OFDM symbols occupied by each coordinated cell control channel in the coordinated cell set, a time domain start location of the resource mapping of each coordinated cell, where the determined time domain start positions of the resource maps of the respective coordinated cells are the same; a notification module, configured to notify the user equipment of a time-frequency resource allocated by the time-frequency resource allocation module and a time domain start position of the resource mapping determined by the start location determining module; the available resource unit determining module, Determining, by the time domain starting location of the resource mapping, an available resource unit of the user equipment, where each coordinated cell maps data symbols to the available resources in sequence from a time domain starting position of the resource mapping Send on the unit.

The network side device according to claim 21, further comprising a data block size determining module, configured to determine a size of the data block according to the MCS level and available resource units.

The network side device according to claim 21, wherein, in resource mapping, if the resource unit is a resource unit occupied by a common pilot or control channel of the coordinated cell, corresponding to the resource unit The data symbols are punctured or the common pilot and data are transmitted simultaneously.

The network side device according to claim 21 or 22, wherein the available resource unit is a resource unit from a start time position of the resource mapping to a end of a subframe, including a common pilot. The occupied resource unit and the resource unit occupied by the control channel.

The network side device according to claim 24, wherein the available resource unit does not include a resource unit occupied by a dedicated pilot.

The network side device according to claim 21 or 22, wherein the resource unit available to the user equipment is all but the resource unit from the start of the time domain of the resource mapping until the end of the subframe. The common pilot signal of the coordinated cell and the remaining resource elements outside the location where the dedicated pilot signal is located.

The network side device according to claim 21, wherein the network side device is a home base station of the terminal, or a base station of a coordinated cell, or a base station control device.

The network side device according to any one of claims 21 to 23, wherein the common pilot signal is a common pilot signal of the LTE-R8 system and/or a common measurement guide of the LTE-A system. Frequency signal.

29. A user equipment, comprising:

a location information receiving module, configured to receive a time domain starting position of a time-frequency resource and a resource mapping sent by the network side device, where a time domain starting position of the resource mapping of each coordinated cell is the same;

a data receiving module, configured to receive, according to the time domain start position of the time-frequency resource and the resource mapping, each coordinated cell to map data symbols to resources available to the user equipment in sequence from a time domain start position of the resource mapping The data sent on the unit.

The user equipment according to claim 29, wherein the available resource unit is a resource unit from a start time position of the resource mapping to a end of a subframe, and includes resources occupied by a common pilot. The resource unit occupied by the unit and control channel.

The user equipment according to claim 30, wherein the available resource unit does not include a resource unit occupied by a dedicated pilot.

The user equipment according to claim 29, wherein the resource unit available to the user equipment is a resource unit from the start of the time domain of the resource mapping until the end of the subframe, except for all the coordinated cells. The remaining resource elements outside the location where the common pilot signal and the dedicated pilot signal are located.

The multi-cell coordinated data transmission system according to any one of claims 30 to 32, wherein the common pilot signal is a common pilot signal of an LTE-R8 system and/or an LTE-A system. Common measurement pilot signals.

34. A base station for a coordinated cell, comprising: an acquiring module and a resource mapping module Piece,

The obtaining module is configured to acquire a time domain starting location of the resource mapping and a resource unit available to the user equipment;

The resource mapping module is configured to map data symbols to the available resource units for transmission from the start of the time domain start position of the resource mapping.

The base station of the coordinated cell according to claim 34, wherein, at the time of resource mapping, if the resource unit is a resource unit occupied by a common pilot or control channel of the coordinated cell, the resource unit is The corresponding data symbols are punctured or the common pilot and data are simultaneously transmitted.

The base station of the coordinated cell according to claim 34, wherein if the available resource unit includes a dedicated pilot, the resource mapping module further needs to use a dedicated pilot in the coordinated cell when the resource is mapped. The corresponding data symbols at the occupied resource units are punctured.

The base station of the coordinated cell according to claim 34, wherein the available resource unit is a resource unit from a start time position of the resource mapping until a subframe ends, including a common pilot occupation. Resource unit and resource unit occupied by the control channel.

The base station of the cooperative cell according to claim 34, wherein, when the resource mapping module performs resource mapping, if the resource unit is a resource unit occupied by a common pilot of another coordinated cell, the resource is used. The corresponding data symbols at the unit are punctured.

39. The base station of a coordinated cell according to claim 34, wherein the available resource unit does not include a resource unit occupied by a dedicated pilot.

The base station of the cooperative cell according to claim 34, wherein the resource unit available to the user equipment is all but the resource unit from the time domain start position of the resource mapping until the end of the subframe. The common resource signal of the cell and the remaining resource elements outside the location where the dedicated pilot signal is located.

The base station of the coordinated cell according to any one of claims 34 to 40, wherein the common pilot signal is a common pilot signal of the LTE-R8 system and/or a common measurement of the LTE-A system. Pilot signal.