CN103312402A - Data transmission method with dynamic cell selection, user terminal and cell - Google Patents

Abstract

The invention discloses a data transmission method for dynamic cell selection, a user terminal and a cell, wherein the method includes: the user receives the physical downlink control channel information issued by the main serving cell; the user receives the optimal downlink control channel information according to the physical downlink control channel information. The data sent by the data sending cell and the demodulation reference signal generated by using the cell identity of the primary serving cell; the user demodulates the received data by using the demodulation reference signal of the primary serving cell. In the data transmission method, user terminal and cell of the present invention for dynamic cell selection, when the optimal data sending cell sends data to the user, it uses the DMRS of the primary serving cell to send, and the user uses the DMRS of the primary serving cell to demodulate the received data, reducing In the original control channel, the signaling process of notifying the user of the optimal data transmission cell index information is eliminated, the process of designing the downlink control signaling format is eliminated, and the overhead of control signaling is reduced.

Description

Data transmission method, user terminal and cell for dynamic cell selection

technical field

The present invention relates to the field of communication technology, in particular, to a data transmission method for dynamic cell selection, a user terminal and a cell.

Background technique

The LTE-A (LTE-Advanced) system adopts OFDMA (Orthogonal Frequency Division Multiplexing Access) technology, and the information of users in the cell is carried on different subcarriers that are orthogonal to each other, thus avoiding Multiple access interference among users in a cell. However, the OFDMA multiple access method itself does not have the ability to suppress inter-cell interference, so the interference that affects the performance of the LTE-A system mainly comes from adjacent cells, that is, inter-cell interference.

In a traditional cellular system with co-frequency networking, users at the edge of a cell will be interfered by signals from adjacent cells, which severely limits the service quality and throughput of edge users. If multiple adjacent cells jointly transmit signals to users through cooperation and suppress interference signals, the inter-cell interference can be effectively reduced and the signal-to-noise ratio of each user's signal reception can be improved.

CoMP (Coordinated Multi Points, coordinated multi-point) transmission technology is divided into two types: JP (joint processing, joint processing) and CS/CB (Coordinated Scheduling/Beamforming, coordinated scheduling/beamforming) according to whether user data is shared between base stations. In the JP scheme, user data is stored in multiple nodes that cooperate, and then it is divided into JT (Joint transmission, joint transmission) and DCS (Dynamic cell selection, dynamic cell selection) according to whether multiple nodes of cooperation participate in the transmission of user data at the same time. . The DCS scheme dynamically selects a certain node in the coordinated cell set as the sending node of user data, and other nodes do not participate in the sending of user data. This solution does not require multiple coordinated cells to transmit user data at the same time, and does not require sharing channel information between multiple cells, which is simpler and easier than the JT solution. In the DCS solution, a cell is generally selected from the coordinated cell set to send data to the user, and the network side needs to notify the user of the information of the selected cell. If the selected cell changes, the network side needs to notify the user of the information of the newly selected cell. In practical applications, the selected cell may change frequently, and if the network side notifies the user of the newly selected cell information every time, the signaling overhead will be increased.

Contents of the invention

The object of the present invention is to propose a data transmission method for dynamic cell selection, a user terminal and a cell for the defect of large control signaling overhead in the existing DCS scheme.

To achieve the above object, according to one aspect of the present invention, a data transmission method for dynamic cell selection is provided.

The data transmission method for dynamic cell selection according to an embodiment of the present invention includes:

The user receives the physical downlink control channel information issued by the primary serving cell;

According to the physical downlink control channel information, the user receives the data sent by the optimal data sending cell and the demodulation reference signal generated by using the cell identity of the primary serving cell;

The user demodulates the received data using the demodulation reference signal of the primary serving cell.

In the above technical solution, before the user receives the physical downlink control channel information issued by the primary serving cell, it also includes:

The user measures the received power of the reference signal, and obtains the received power information of the reference signal and/or the received quality information of the reference signal;

The user selects the primary serving cell according to the reference signal received power information and/or the reference signal received quality information.

In the above technical solution, before receiving the data sent by the optimal data sending cell and the demodulation reference signal generated by using the cell identity of the primary serving cell, it also includes:

The user measures the channel quality of each cell in the CoMP set, selects the optimal data sending cell, and reports the index information and channel quality information of the optimal data sending cell.

In the above technical solution, the index information of the optimal data sending cell is the cell identity of the optimal data sending cell or the index information defined according to the coordinated multi-point cooperation scenario.

In the above technical solution, the steps for the user to measure the channel quality and select the optimal data sending cell specifically include:

The user estimates the downlink common reference channel of each cell in the CoMP set, obtains the channel gain of each cell, and selects the cell with the largest channel gain as the optimal data sending cell; or,

The user estimates the downlink common reference channel of each cell in the CoMP set, traverses all codebooks, selects the optimal codebook for each cell, and selects the cell with the largest throughput as the optimal data sending cell.

In the above technical solution, before the user uses the demodulation reference signal of the primary serving cell to demodulate the received data, it also includes:

The user uses the identifier of the primary serving cell to generate a demodulation reference signal, and the generated demodulation reference signal is a demodulation reference signal of the primary serving cell.

To achieve the above object, according to one aspect of the present invention, another data transmission method for dynamic cell selection is provided.

The data transmission method for dynamic cell selection according to an embodiment of the present invention includes:

The main serving cell receives the index information and channel quality information of the optimal data sending cell reported by the user;

The primary serving cell notifies the optimal data sending cell to send data to the user; the primary serving cell sends physical downlink control channel information to the user.

In the above technical solution, the physical downlink control channel information does not include the index information of the optimal data sending cell.

In the above technical solution, the index information of the optimal data sending cell is the identifier of the optimal data sending cell or the index information defined according to the coordinated multi-point cooperation scenario.

In the above-mentioned technical scheme, also include:

The main serving cell allocates resources for the current user and calculates the precoding matrix, and sends the resource allocation information and the precoding matrix to the optimal data sending cell.

To achieve the above object, according to one aspect of the present invention, another data transmission method for dynamic cell selection is provided.

The data transmission method for dynamic cell selection according to an embodiment of the present invention includes:

The optimal data sending cell receives the request sent by the main serving cell to send data to the user;

The optimal data sending cell sends data and the demodulation reference signal of the primary serving cell to the user.

In the above technical solution, before the step of the optimal data sending cell sending data and the demodulation reference signal of the primary serving cell to the user, it further includes: the optimal data sending cell uses the identity of the primary serving cell to generate a demodulation reference signal, and the generated The demodulation reference signal is a demodulation reference signal of the primary serving cell.

In the above technical solution, before the optimal data sending cell sends the data and the demodulation reference signal of the primary serving cell to the user, it also includes:

The optimal data sending cell obtains the resource allocation information and precoding matrix provided by the main serving cell;

The optimal data sending cell uses the precoding matrix to weight the data and the demodulation reference signal of the main serving cell respectively;

The step of the optimal data sending cell sending the data and the demodulation reference signal of the primary serving cell to the user specifically includes: the optimal data sending cell sends the data weighted by the precoding matrix and the primary serving cell's DRS on the resources indicated by the resource allocation information. demodulation reference signal.

In the above technical solution, after the optimal data sending cell receives the request sent by the primary serving cell to send data to the user, it further includes:

The optimal data sending cell judges whether to respond to the request sent by the main serving cell to send data to the user;

If the response is answered, a confirmation message is sent to the primary serving cell; otherwise, a rejection message is sent to the primary serving cell.

To achieve the above object, according to another aspect of the present invention, a user terminal for dynamic cell selection is provided.

A user terminal for dynamic cell selection according to an embodiment of the present invention includes:

An information receiving module, configured to receive physical downlink control channel information issued by the primary serving cell;

The data receiving module is used to receive the data sent by the optimal data sending cell and the demodulation reference signal generated using the cell identity of the primary serving cell according to the physical downlink control channel information;

The data demodulation module is used to demodulate the received data by using the demodulation reference signal of the primary serving cell.

In the above technical solution, the user terminal also includes:

An information obtaining module, configured to measure the received power of the reference signal, and obtain the received power information of the reference signal and/or the received quality information of the reference signal;

The cell selection module is configured to select a primary serving cell according to the reference signal received power information and/or the reference signal received quality information.

In the above technical solution, the user terminal also includes:

The selection reporting module is used to measure the channel quality of each cell in the coordinated multi-point set, select the optimal data sending cell, and report the index information and channel quality information of the optimal data sending cell.

In the above technical solution, the selection of the reporting module specifically includes:

The first selection submodule is used to estimate the downlink common reference channel of each cell in the CoMP set, obtain the channel gain of each cell, and select the cell with the largest channel gain as the optimal data transmission cell; or,

The second selection submodule is used to estimate the downlink common reference channel of each cell in the coordinated multi-point coordinated set, traverse all codebooks, select the optimal codebook for each cell, and select the cell with the largest throughput as the optimal data send cell.

To achieve the above object, according to another aspect of the present invention, a primary serving cell for dynamic cell selection is provided.

The primary serving cell for dynamic cell selection according to an embodiment of the present invention includes:

The information receiving module is used to receive the index information and channel quality information of the optimal data sending cell reported by the user;

The data notification module is used to notify the optimal data sending cell to send data to the user;

The information sending module is used to send physical downlink control channel information to users.

In the above technical solution, the main serving cell also includes:

The allocation calculation module is used to allocate resources for the current user and calculate the precoding matrix, and send the resource allocation information and the precoding matrix to the optimal data sending cell.

To achieve the above object, according to another aspect of the present invention, an optimal data sending cell for dynamic cell selection is provided.

The optimal data sending cell for dynamic cell selection according to an embodiment of the present invention includes:

A request receiving module, configured to receive a request for sending data to a user sent by the main serving cell;

The data sending module is used to send data and the demodulation reference signal of the primary serving cell to the user.

In the above technical solution, the optimal data sending cell also includes:

An information obtaining module, configured to obtain resource allocation information and a precoding matrix provided by the primary serving cell;

A matrix weighting module, configured to use a precoding matrix to respectively weight the demodulation reference signal of the data and the primary serving cell;

The data sending module is specifically configured to send the data weighted by the precoding matrix and the demodulation reference signal of the primary serving cell on the resources indicated by the resource allocation information. In the above technical solution, the optimal data sending cell also includes:

Response judging module, used to judge whether to respond to the request sent by the main serving cell to send data to the user;

The response sending module is used to send a message to the primary serving cell according to whether the response is answered: if the response is answered, a confirmation message is sent to the primary serving cell; otherwise, a rejection message is sent to the primary serving cell.

According to the data transmission method, user terminal and cell for dynamic cell selection in each embodiment of the present invention, the DMRS sent by the optimal data sending cell to the user is the DMRS of the primary serving cell, and the user uses the DMRS of the primary serving cell to demodulate the received data, reducing In the original control channel, the signaling process of notifying the user of the optimal data transmission cell index information is eliminated, the process of designing the downlink control signaling format is eliminated, and the overhead of control signaling is reduced; for the user, data transmission is transparent , which is equivalent to receiving data from the main serving base station.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a flow chart of Embodiment 1 of a data transmission method for dynamic cell selection according to the present invention;

FIG. 2 is a schematic structural diagram of Embodiment 2 of a data transmission method for dynamic cell selection according to the present invention;

3 is a flow chart of Embodiment 2 of a data transmission method for dynamic cell selection according to the present invention;

FIG. 4 is a schematic diagram of a user terminal for dynamic cell selection according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a primary serving cell for dynamic cell selection according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of an optimal data sending cell for dynamic cell selection according to an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

method embodiment

Embodiment 1 of the method of the present invention provides a data transmission method for dynamic cell selection, as shown in FIG. 1 , this embodiment includes:

Step 102: the user selects a primary serving cell;

Step 104: The user periodically measures the channel quality of each cell in the CoMP cooperating set, selects the optimal data sending cell, and reports the index information and channel quality of the optimal data sending cell to the primary serving cell;

Step 106: After a period of delay, the primary serving cell receives the index information and channel quality of the optimal data sending cell reported by the user, notifies the optimal data sending cell to send data to the user, and sends PDCCH (Physical Downlink Control Channel) to the user Information indicating the index information of the optimal data sending cell at the current moment, wherein the index information of the optimal data sending cell notified to the user by the main serving cell may not be the index information of the optimal data sending cell reported by the user itself;

Step 108: the optimal data sending cell uses its own DMRS (Demodulation Reference Signals, demodulation reference signal) to send data to the user;

Step 110: The user uses the optimal data to send the DMRS demodulation data of the cell.

In the data transmission method of dynamic cell selection in Embodiment 1 of the method, the control channel is sent by the main serving cell, and the data channel is sent by the optimal data sending cell, which ensures the optimal transmission effect of data transmission.

因此，对用户来说，数据的发送是透明的，即从用户端来看，可以理解为数据仍由主服务小区发送。图2中，UE1的主服务小区为TP1，最优数据发送小区为TP2，那么该用户的DMRS选择TP1的序列

同样的，UE2的主服务小区为TP2，最优数据发送小区为TP1，那么该用户的DMRS选择TP2的序列为 Embodiment 2 of the method of the present invention provides another data transmission method for dynamic cell selection, as shown in Figure 2, the general idea of this embodiment is: the user's control channel is sent by the main serving cell, and the data channel is sent by the optimal data The cell (ie TPoptimal) sends, but the DMRS still uses the sequence of the primary serving cell

Therefore, for the user, the data transmission is transparent, that is, from the perspective of the user end, it can be understood that the data is still transmitted by the primary serving cell. In Figure 2, the main serving cell of UE1 is TP1, and the optimal data sending cell is TP2, then the user's DMRS selects the sequence of TP1

Similarly, UE2's primary serving cell is TP2, and the optimal data sending cell is TP1, then the user's DMRS selects the sequence of TP2 as

It should be noted that y can be (N ^x _ID ), where y represents DMRS, f is the sequence function of the serving cell x of the argument N, the superscript x of N represents the name of the serving cell of the f function, and the subscript ID represents the service cell The cell identity of cell x; ie, the DMRS is a function of the cell identity (ie cell ID).

As shown in Figure 3, the specific implementation process of this embodiment is:

Step 202: the user selects the main serving cell ServCell;

Specifically, when the user performs cell selection or reselection, according to the measured downlink reference signal received power, obtain reference signal received power (RSRP, reference signal received power, reference signal received power) information and/or reference signal received quality ( RSRQ, reference signal received quality, reference signal received quality) information, wherein, reference signal received quality = coefficient a × useful reference signal received power / all reference signal received power, and then according to reference signal received power information and/or reference signal received quality information , select the main serving cell;

Step 204: The user measures the channel quality of each cell in the CoMP coordination set at a certain period, selects the optimal data transmission cell (TPoptimal), and reports the index information (Index) and channel quality information (CQI) of the optimal data transmission cell to the primary serving cell (Channel quality indicator, channel quality indicator);

It should be noted that the Index of TPoptimal can be the cell identifier of TPoptimal, or a newly defined Index for cooperation scenarios;

In step 204, the method of selecting the optimal data sending cell according to the channel quality includes but not limited to:

Channel gain method: the user estimates the downlink common reference channel of each cell in the CoMP coordination set, obtains the channel gain of each cell, and selects the cell with the largest channel gain as the optimal data transmission cell;

Throughput maximum method: the user estimates the downlink common reference channel of each cell in the CoMP coordination set, traverses all codebooks, selects the optimal codebook for each cell, and selects the cell with the largest throughput as the optimal data transmission cell; where , the codebook is a set of precoding codebooks defined by the system in the codebook basedprecoding transmission mode;

Step 206: The primary serving cell allocates downlink resources for users and determines a precoding matrix;

Step 208: After receiving the reported index of the optimal data sending cell (ie TPoptimal) after a certain delay, the main serving cell notifies the optimal data sending cell to send data to the user, and sends the resource allocation information and precoding matrix to the optimal data sending cell. Data sending cell;

It should be noted that in step 208, the optimal data sending cell (i.e. TPoptimal) reported by the primary serving cell may be different from the optimal data sending cell notified by the primary serving cell to send data for the current user. The optimal data sending cell reported by the user can be modified or incorrectly received, and the main serving cell can then select the optimal data sending cell to send data for the current user according to its own measurement results or its own needs.

In step 208, the primary serving cell may inform the optimal data sending cell of the information through the X2 interface, or the central coordination unit (for unified management of multiple cooperative cells) may forward the information;

Step 210: After TPoptimal obtains the resource allocation information and the precoding matrix, use the precoding matrix to weight the data to be sent to the user and the DMRS of the main serving cell respectively, and send the weighted precoding matrix on the resource indicated by the resource allocation information Data and the DMRS of the primary serving cell, wherein the DMRS of the primary serving cell is a DMRS generated by TPoptimal using the index information of the primary serving cell;

Step 212: The main serving cell sends PDCCH (physical downlink control channel, physical downlink control channel) for the user, and TPoptimal sends data for the user;

这样就不用通知用户最优数据发送小区的索引信息，用户只利用主服务小区的DMRS即可正确接收数据。In step 212, in the process of TPoptimal sending data for the user, the DMRS selects the sequence of the primary serving cell

In this way, the user does not need to be notified of the index information of the optimal data sending cell, and the user can receive data correctly only by using the DMRS of the primary serving cell.

完成数据信道的接收；具体地，用户获得主服务小区的cell ID后，根据y＝f(N^x _ID)的公式可以算得DMRS。即，用户利用主服务小区的cell ID生成DMRS，生成的DMRS即为主服务小区的DMRS，用户利用主服务小区的DMRS解调TPoptimal发送的数据。Step 214: The user uses the DMRS of the primary serving cell

The reception of the data channel is completed; specifically, after the user obtains the cell ID of the primary serving cell, the DMRS can be calculated according to the formula of y=f(N ^x _ID ). That is, the user uses the cell ID of the primary serving cell to generate a DMRS, and the generated DMRS is the DMRS of the primary serving cell, and the user uses the DMRS of the primary serving cell to demodulate the data sent by TPoptimal.

Compared with the method embodiment 1, the data transmission method for dynamic cell selection in the second embodiment of the method differs in that (1) in step 212, the PDCCH sent by the primary serving cell to the user does not necessarily indicate the optimal data sending cell Index information; (2) in step 210, the optimal data transmission cell utilizes the cell ID of the primary serving cell to generate the DMRS, that is, generates the DMRS of the primary serving cell, and the DMRS sent to the user is the DMRS of the primary serving cell; (3) in In step 214, the user uses the DMRS generated according to the cell ID of the primary serving cell to demodulate data. It should be noted that between the step of the primary serving cell sending the PDCCH to the user, and the step of the primary serving cell notifying the optimal data transmitting cell to send data to the user, and sending the resource allocation information and the precoding matrix to the optimal data transmitting cell There is no necessary sequence relationship.

As can be seen from the above differences, in the data transmission method of dynamic cell selection in this embodiment, the optimal data sending cell sends data to the user and uses the DMRS generated by the cell ID of the primary serving cell, and the user demodulates and receives the data using the DMRS of the primary serving cell. data, which reduces the signaling process in the original control channel that needs to notify the user of the optimal data to send cell index information, eliminates the process of designing the downlink control signaling format, and reduces the overhead of control signaling; for the user, the data Sending is transparent and equivalent to receiving data from the main serving base station.

In order to make it easier for those skilled in the art to understand the technical solution of the present application more thoroughly, the second embodiment of the above method is now further described, as shown in the following method embodiments three, four, and five, respectively from the user side and the main serving cell The side and the optimal data sending cell side will be described in detail.

Embodiment 3 of the method of the present invention provides another data transmission method for dynamic cell selection. This embodiment mainly uses the user side to illustrate the implementation process of the method. This embodiment includes:

Step 302: The user measures the downlink reference signal received power, obtains reference signal received power information and/or reference signal received quality information, and selects a primary serving cell according to the reference signal received power information and/or reference signal received quality information;

Step 304: The user measures the channel quality of each cell in the CoMP coordination set, selects the optimal data transmission cell (TPoptimal), and reports the index information (Index) and channel quality information (ie, CQI, CQI) of the optimal data transmission cell to the primary serving cell. Expressed in MCS (Modulation and CodingScheme, modulation and coding format);

It should be noted that the Index of TPoptimal can be the cell ID of TPoptimal, or a newly defined Index for collaboration scenarios;

In step 304, the method for selecting the optimal data sending cell according to the channel quality includes:

Channel gain method: the user estimates the downlink common reference channel of each cell in the CoMP coordination set, obtains the channel gain of each cell, and selects the cell with the largest channel gain as the optimal data transmission cell;

Throughput maximum method: the user estimates the downlink common reference channel of each cell in the CoMP coordination set, traverses all codebooks, selects the optimal codebook for each cell, and selects the cell with the largest throughput as the optimal data transmission cell;

Step 306: the user receives the PDCCH sent by the primary serving cell, and obtains the MCS level and resource allocation;

Step 308: The user receives the data sent by TPoptimal, and uses the DMRS of the primary serving cell to demodulate the received data. The DMRS of the primary serving cell is a DMRS generated by the user according to the cell ID of the primary serving cell. In addition, the user receives the data sent by TPoptimal on the resource indicated by the resource allocation information carried by the PDCCH.

Embodiment 4 of the method of the present invention provides another data transmission method for dynamic cell selection. This embodiment mainly uses the main serving cell side to illustrate the implementation process of the method. This embodiment includes:

Step 402: The primary serving cell sends a common reference signal;

Step 404: The main serving cell receives the index information (ie Index) and channel quality information (CQI) of the optimal data sending cell (ie TPoptimal) fed back by the user;

In step 404, before the optimal data transmission cell is not selected, the above CQI is the CQI of the primary serving cell, and after the optimal data transmission cell is selected, the above CQI is the CQI of the optimal data transmission cell;

Step 406: The primary serving cell allocates resources for the current user and calculates a precoding matrix;

Step 408: The primary serving cell notifies TPoptimal to send data for the current user, and sends resource allocation information and a precoding matrix to the user, so that TPoptimal uses the precoding matrix to weight the data to be sent to the user and the DMRS of the primary serving cell, respectively, And send the weighted data and the DMRS of the primary serving cell to the user on the resources indicated by the resource allocation information, wherein the DMRS of the primary serving cell is the DMRS generated by TPoptimal using the index information of the primary serving cell;

It should be noted that the premise of the present invention is that there is a collaborative network between multiple cells, and each cell ID on the network side is known, so in step 408, when the primary serving cell notifies TPoptimal to send data for the current user, It is not necessary to notify TPoptimal of the cell ID of the main serving cell;

Step 410: The primary serving cell sends a PDCCH to the user.

Embodiment 5 of the method of the present invention provides another data transmission method for dynamic cell selection. This embodiment mainly uses the optimal data transmission cell side to illustrate the implementation process of the method. This embodiment includes:

Step 502: The optimal data sending cell sends a common reference signal;

Step 504: The optimal data sending cell receives a request from the main serving cell to send data to the user;

Step 506: The optimal data sending cell judges whether to receive the data sending request according to its own load or network quality, for example, if its own load is heavy, it will not receive the data sending request; if its own load is light, it will receive the data send request;

Step 508: The optimal data sending cell sends a message confirmation or rejection to the main serving cell;

Step 510: After the message is confirmed, the optimal data sending cell uses the ID of the primary serving cell to generate a DMRS of the primary serving cell, and sends the data and the DMRS of the primary serving cell to the user.

It should be noted that before the optimal data sending cell sends the data and the DMRS of the primary serving cell to the user, it can obtain the resource allocation information and the precoding matrix provided by the primary serving cell, and use the precoding matrix to respectively classify the data to be sent to the user. weighting with the DMRS of the primary serving cell, and then sending the weighted data and the DMRS of the primary serving cell to the user on the resources indicated by the resource allocation information.

Device embodiment

According to an embodiment of the present invention, a user terminal for dynamic cell selection is provided. As shown in Figure 4, this embodiment includes:

An information receiving module 11, configured to receive physical downlink control channel information issued by the primary serving cell;

The data receiving module 12 is configured to receive the data sent by the optimal data sending cell and the demodulation reference signal generated using the cell identity of the primary serving cell according to the physical downlink control channel information;

The data demodulation module 13 is configured to use the demodulation reference signal of the primary serving cell to demodulate the received data.

This embodiment also includes:

An information obtaining module 14, configured to measure the received power of the reference signal, and obtain the received power information of the reference signal and/or the received quality information of the reference signal;

A cell selection module 15, configured to select a primary serving cell according to reference signal received power information and/or reference signal received quality information;

The selection reporting module 16 is used to measure the channel quality of each cell in the CoMP set, select the optimal data sending cell, and report the index information and channel quality information of the optimal data sending cell.

Wherein: the selection reporting module 16 specifically includes:

The first selection submodule 161 is configured to estimate the downlink common reference channel of each cell in the CoMP set, obtain the channel gain of each cell, and select the cell with the largest channel gain as the optimal data transmission cell; or,

The second selection submodule 162 is used to estimate the downlink common reference channel of each cell in the CoMP set, traverse all codebooks, select the optimal codebook for each cell, and select the cell with the largest throughput as the optimal Data sending cell.

According to an embodiment of the present invention, a primary serving cell for dynamic cell selection is provided. As shown in Figure 5, this embodiment includes:

The information receiving module 21 is used to receive the index information and channel quality information of the optimal data transmission cell reported by the user;

The data notification module 22 is used to notify the optimal data sending cell to send data to the user;

The information sending module 23 is configured to send physical downlink control channel information to users.

This embodiment also includes:

The allocation calculation module 24 is configured to allocate resources for the current user and calculate the precoding matrix, and send the resource allocation information and the precoding matrix to the optimal data sending cell.

According to an embodiment of the present invention, an optimal data sending cell for dynamic cell selection is provided. As shown in Figure 6, this embodiment includes:

A request receiving module 31, configured to receive a request for sending data to a user sent by the primary serving cell;

The data sending module 32 is configured to send data and a demodulation reference signal of the primary serving cell to the user.

The optimal data sending cell also includes:

An information obtaining module 35, configured to obtain resource allocation information and a precoding matrix provided by the primary serving cell;

A matrix weighting module 36, configured to use a precoding matrix to weight the demodulation reference signal of the data and the primary serving cell, respectively;

The data sending module 32 is specifically used to send the data weighted by the precoding matrix and the demodulation reference signal of the primary serving cell on the resource indicated by the resource allocation information; the response judgment module 33 is used to judge whether to respond to the message sent by the primary serving cell. Requests to send data to users;

The response sending module 34 is configured to send a message to the primary serving cell according to the result of the response: if it responds, send a confirmation message to the primary serving cell, otherwise, send a rejection message to the primary serving cell.

The user terminal, the primary serving cell, and the optimal data sending cell in the dynamic cell selection of the above embodiments, when the optimal data sending cell sends data to the user, use the DMRS of the primary serving cell to send, and the user uses the DMRS of the primary serving cell for demodulation The received data reduces the signaling process of notifying the user of the optimal data transmission cell index information in the original control channel, eliminates the process of designing the downlink control signaling format, and reduces the overhead of control signaling; for the user, Data transmission is transparent, equivalent to receiving data from the main serving base station.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (23)

1. the data transmission method that dynamic cell is selected is characterized in that, comprising:

The user receives the Physical Downlink Control Channel information that main Serving cell issues;

The user receives optimal data and sends the demodulated reference signal that the residential quarter data that send and the cell ID that uses main Serving cell generate according to described Physical Downlink Control Channel information;

The data that the user uses the demodulated reference signal demodulation of main Serving cell to receive.

2. method according to claim 1 is characterized in that, also comprises receive the step of the Physical Downlink Control Channel information that main Serving cell issues described user before:

The received power of user's measuring reference signals obtains Reference Signal Received Power information and/or Reference Signal Received Quality information;

Described user selects main Serving cell according to Reference Signal Received Power information and/or Reference Signal Received Quality information.

3. method according to claim 1 is characterized in that, also comprises before the step of the demodulated reference signal that the data that receive optimal data transmission residential quarter transmission and the cell ID that uses main Serving cell generate:

The user measures the channel quality of each residential quarter in the coordinate multipoint cooperation set, selects optimal data to send the residential quarter, and reports optimal data to send index information and the channel quality information of residential quarter.

4. method according to claim 3 is characterized in that, the index information that described optimal data sends the residential quarter is that described optimal data sends the cell ID of residential quarter or according to the index information of the cooperation scenario definition of coordinate multipoint.

5. method according to claim 3 is characterized in that, user's measure channel quality, and the step of selecting optimal data to send the residential quarter specifically comprises:

The user estimates the descending common reference channel of each residential quarter in the coordinate multipoint cooperation set, obtains the channel gain of each residential quarter, and the maximum residential quarter of selective channel gain is that optimal data sends the residential quarter; Or,

The user estimates the descending common reference channel of each residential quarter in the coordinate multipoint cooperation set, travels through all code books, selects optimum code book for each residential quarter, and the residential quarter of selection throughput maximum is that optimal data sends the residential quarter.

6. method according to claim 1 is characterized in that, also comprises use the step of the data that the demodulated reference signal demodulation of main Serving cell receives the user before:

The user uses the sign of main Serving cell to generate demodulated reference signal, and the demodulated reference signal of described generation is the demodulated reference signal of main Serving cell.

7. the data transmission method that dynamic cell is selected is characterized in that,

Main Serving cell receives index information and the channel quality information of the optimal data transmission residential quarter of reporting of user;

Described main Serving cell notice optimal data sends the residential quarter and sends data to the user;

Described main Serving cell sends Physical Downlink Control Channel information to the user.

8. method according to claim 7 is characterized in that, does not comprise in the described Physical Downlink Control Channel information that optimal data sends the index information of residential quarter.

9. method according to claim 8 is characterized in that, the index information that described optimal data sends the residential quarter is that described optimal data sends the sign of residential quarter or according to the index information of the cooperation scenario definition of coordinate multipoint.

10. according to claim 7,8 or 9 described methods, it is characterized in that, also comprise: distribute and calculate pre-coding matrix by resource for the active user carries out for described main Serving cell, resource allocation information and pre-coding matrix issued optimal data send the residential quarter.

11. the data transmission method that dynamic cell is selected is characterized in that, comprising:

What optimal data sent that the residential quarter receives that main Serving cell sends sends the request of data to the user;

Described optimal data sends the residential quarter sends data and demodulated reference signal from main Serving cell to the user.

12. method according to claim 11, it is characterized in that, also comprised before described optimal data sends the residential quarter sends data and the step of demodulated reference signal from main Serving cell to the user: described optimal data sends the residential quarter and uses the sign of main Serving cell to generate demodulated reference signal, and the demodulated reference signal of described generation is the demodulated reference signal of main Serving cell.

13. according to claim 11 or 12 described methods, it is characterized in that, before described optimal data sends the residential quarter sends data and the step of demodulated reference signal from main Serving cell to the user, also comprise:

Described optimal data sends the residential quarter and obtains resource allocation information and the pre-coding matrix that main Serving cell provides;

Described optimal data sends the residential quarter and uses pre-coding matrix respectively the demodulated reference signal of data and main Serving cell to be weighted;

Described optimal data sends the residential quarter and specifically comprises to the step that the user sends the demodulated reference signal of data and main Serving cell: described optimal data sends the residential quarter and sends through the data after the pre-coding matrix weighting and the demodulated reference signal of main Serving cell in the resource of resource allocation information indication.

14. according to claim 11 or 12 described methods, it is characterized in that, after optimal data sends the step that the residential quarter receives the request that sends data to the user that main Serving cell sends, also comprise:

Described optimal data sends the residential quarter and judges whether to reply that main Serving cell sends sends the request of data to the user;

If reply, then send acknowledge message to described main Serving cell, otherwise, then send refuse information to described main Serving cell.

15. the user terminal that dynamic cell is selected is characterized in that, comprising:

Information receiving module is used for receiving the Physical Downlink Control Channel information that main Serving cell issues;

Data reception module is used for according to described Physical Downlink Control Channel information, receives optimal data and sends the demodulated reference signal that the residential quarter data that send and the cell ID that uses main Serving cell generate;

Data demodulation module is for the data of the demodulated reference signal demodulation reception of using described main Serving cell.

16. user terminal according to claim 15 is characterized in that, also comprises:

The information acquisition module for the received power of measuring reference signals, obtains Reference Signal Received Power information and/or Reference Signal Received Quality information;

Module is selected in the residential quarter, is used for according to Reference Signal Received Power information and/or Reference Signal Received Quality information, selects main Serving cell.

17. user terminal according to claim 15 is characterized in that, also comprises:

Select reporting module, be used for measuring the channel quality of each residential quarter of coordinate multipoint cooperation set, select optimal data to send the residential quarter, and report optimal data to send index information and the channel quality information of residential quarter.

18. user terminal according to claim 17 is characterized in that, described selection reporting module specifically comprises:

The first chooser module is used for estimating the coordinate multipoint cooperation and gathers the descending common reference channel of each residential quarter, obtains the channel gain of each residential quarter, and the maximum residential quarter of selective channel gain is that optimal data sends the residential quarter; Or,

The second chooser module is used for estimating the coordinate multipoint cooperation and gathers the descending common reference channel of each residential quarter, travels through all code books, selects optimum code book for each residential quarter, and the residential quarter of selection throughput maximum is that optimal data sends the residential quarter.

19. the main Serving cell that dynamic cell is selected is characterized in that, comprising:

Information receiving module is for index information and the channel quality information of the optimal data transmission residential quarter that receives reporting of user;

The data notification module is used for notice optimal data transmission residential quarter and sends data to the user;

Information sending module is used for sending Physical Downlink Control Channel information to the user.

20. main Serving cell according to claim 19 is characterized in that, also comprises:

The Distribution Calculation module is used to the active user to carry out resource distribution and calculating pre-coding matrix, and resource allocation information and pre-coding matrix are issued optimal data transmission residential quarter.

21. the optimal data transmission residential quarter that dynamic cell is selected is characterized in that, comprising:

The request receiving module is used for receiving that main Serving cell sends sends the request of data to the user;

Data transmission blocks is for the demodulated reference signal that sends data and main Serving cell to the user.

22. optimal data according to claim 21 sends the residential quarter, it is characterized in that, also comprises:

The information acquisition module is used for obtaining resource allocation information and the pre-coding matrix that main Serving cell provides;

The matrix weighting block is used for using pre-coding matrix respectively the demodulated reference signal of data and main Serving cell to be weighted;

Described data transmission blocks, concrete being used for sends through the data after the pre-coding matrix weighting and the demodulated reference signal of main Serving cell in the resource of resource allocation information indication.

23. according to claim 21 or 22 described optimal data send residential quarters, it is characterized in that, also comprise:

Reply judge module, be used for judging whether replying that main Serving cell sends sends the request of data to the user;

Reply sending module, be used for the result whether basis replys, send message to main Serving cell: if reply, then send acknowledge message to described main Serving cell, otherwise, then send refuse information to described main Serving cell.

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