CN102647789B - Send the method for detection reference signal, resource allocation methods, system and base station - Google Patents

Abstract

The invention relates to a method for sending a sounding reference signal in a coordinated multi-point transmission system, a resource allocation method, a system and a base station. In the resource allocation method: the network side allocates resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (referred to as SRS resources), where CoMP? Are the SRS resources allocated by the UE the same as non-CoMP? The SRS resources allocated by the UE are orthogonal; the network side notifies the UE of the resource allocation result. The invention can solve the interference problem of SRS signal and improve the performance of SRS channel detection.

Description

Method for sending sounding reference signal, resource allocation method, system and base station

technical field

The present invention relates to the communication field, in particular to a method for sending a sounding reference signal, a resource allocation method, a system and a base station.

Background technique

In the current LTE-A (Long Term Evolution-Advanced, Advanced Long Term Evolution) system, the performance difference between a cell edge user equipment (User Equipment, UE) and a cell center UE is still a major problem. Although the use of multi-antenna technology can increase the data rate in the center of the cell, it is difficult to improve the performance at the edge of the cell. Due to the low signal-to-interference ratio at the edge of the cell, it is difficult to support multi-stream transmission. Therefore, as the number of antennas used in the system increases, the performance of the cell center may continue to improve, but the performance of the cell edge is difficult to improve. The high-order modulation methods that can be used in the cell center are also difficult to use at the cell edge, resulting in The performance variance at the cell edge is increasing.

Therefore, the LTE-A system will improve cell edge performance as one of its main indicators. In order to increase the transmission rate at the edge of the cell, 3GPP introduces a CoMP (Coordinated Multi-Point Coordinated Multi-Point) transmission technology. It mainly improves the data transmission rate of the edge UE through cooperation among cells. Although the CoMP technology improves the throughput of the edge UE, it also increases the complexity of the network system.

In a CoMP system, multiple nodes cooperate to provide services for the same UE (the present invention refers to this kind of UE as CoMPUE, otherwise it is called non-CoMPUE or non-CoMPUE). In order for eNB to make reasonable resource scheduling, CoMPUE needs to simultaneously Send SRS (Sounding Reference Signal, Sounding Reference Signal) information to the serving cell and the coordinated cell to measure uplink channel state information. In addition, in the CoMPTDD system, the SRS is an effective feedback scheme, and the CoMPUE also needs to send the SRS to the serving cell and the coordinated cell at the same time so that the eNB can obtain corresponding downlink channel state information. However, when the CoMPUE transmits the SRS signal to the coordinated cell in the uplink, it is often interfered by the data or the SRS signal of the user in the coordinated cell, especially the SRS signal interference. This is due to the cell-specific design of the SRS sequence group, the SRS base sequences used by UEs in adjacent cells come from different sequence groups, and may have different sequence lengths or partially overlap in frequency, making the mutual interaction between the sequences The correlation is relatively large and the interference is serious, which leads to a severe degradation of the SRS channel detection performance between the CoMPUE and its coordinated cell. As shown in FIG. 1 , the serving cell of the CoMPUE in the uplink is cell1, and the cooperating cell is cell2. The SRS detection performance of the CoMPUE→cell1 channel is acceptable, because there is no interference in the LTE cell. However, the SRS detection performance of the CoMPUE→cell2 channel is greatly reduced due to strong interference, because the SRS signal of the CoMPUE has experienced a large fading from cell1 to cell2 itself, and more seriously, the CoMPUE and other interfering UEs (UE1-4) The SRS sequences used come from different sequence groups, may have different sequence lengths, and have partial frequency overlap, resulting in strong cross-correlation between them, and thus strong interference.

The CoMP performance degradation caused by the SRS interference caused by the SRS sequence cross-correlation may even "offset" the benefits brought by the adoption of CoMP.

Contents of the invention

The invention discloses a method for sending a sounding reference signal in a coordinated multi-point transmission system, a resource allocation method, a system and a base station, so as to solve the interference problem of SRS signals.

In order to solve the above technical problems, the present invention provides a resource allocation method, which includes:

The network side allocates resources for the user equipment (UE), and the allocated resources include resources for sending sounding reference signals (referred to as SRS resources), wherein the SRS resources allocated for the CoMPUE are orthogonal to the SRS resources allocated for the non-CoMPUE;

The network side notifies the UE of the resource allocation result.

Further, the network side implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration.

Further, the intersection of the set of subframes allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE is empty, or the set of Comb allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE are empty. The intersection of the sets of Combs allocated by the non-CoMPUE is empty.

Further, the network side allocates SRS resources for the CoMPUEs in the coordinated aggregated cells by adopting a resource allocation method within an LTE common cell.

Further, the resources allocated by the network side also include resources for sending data signals, and if the network side implements SRS resource orthogonality through subframe configuration, when allocating resources for sending data signals, indicate the cooperating set The UE in the coordinated cell reduces the transmission power of the data signal or releases the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal.

Further, the network side instructs the UE of the coordinated cell of the coordinated set cell to reduce the data signal transmission power or release the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal includes:

The serving cell notifies its cooperating cell of the resource information of the CoMPUE sending the SRS signal in the cell;

The coordinated cell sends indication information to the UE in the cell according to the received resource information, so as to instruct the UE in the cell to reduce the transmission power of the data signal or release the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal ;

When the UE in the coordinated cell transmits the data signal, the transmission power of the data signal is reduced or the last symbol of the corresponding resource block is released on the corresponding resource where the CoMP UE of the serving cell transmits the SRS signal.

Further, the manner of releasing the last symbol of the corresponding resource block includes puncturing or adopting a shortened (Shorten) structure.

In order to solve the above technical problems, the present invention also provides a base station, which includes:

The resource allocation module is configured to allocate resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for CoMPUE are the same as the SRS allocated for non-CoMPUE Orthogonal resources;

A resource allocation result notification module, configured to notify the UE of the resource allocation result.

In order to solve the above technical problems, the present invention also provides a method for sending a Sounding Reference Signal (SRS), the method comprising:

The network side allocates resources for the user equipment (UE) and notifies the UE that the allocated resources include resources for sending SRS signals (referred to as SRS resources), where the SRS resources allocated for CoMP UEs are orthogonal to the SRS resources allocated for non-CoMP UEs ;

The UE determines the SRS signal, and sends the SRS signal on the SRS resource allocated by the network side.

Further, the network side allocates SRS resources for the CoMPUEs in the coordinated aggregated cells by adopting a resource allocation method within an LTE common cell.

Further, the step of the UE determining the SRS signal includes:

The network side and the UE set default cell identification rules for determining the SRS signal, wherein the CoMPUE uses a virtual cell ID to determine the SRS signal, and the non-CoMPUE uses an actual physical cell ID to determine the SRS signal;

The network side sends indication information to the UE, where the indication information is used to indicate the CoMP attribute of the UE;

The UE determines to use the cell identity according to the indication information sent by the network side, and further determines the SRS signal.

Further, the step of the UE determining the SRS signal includes:

The network side sends indication information to the UE, where the indication information is used to indicate the cell identity used by the UE to determine the SRS signal; where if the UE is a CoMP UE, it indicates the use of a virtual cell ID, and if it is If it is not a CoMPUE, it indicates the use of the actual physical cell ID;

The UE determines the cell identity according to the indication information sent by the network side, and further determines the SRS signal.

In order to solve the above technical problems, the present invention also provides a coordinated multi-point transmission (CoMP) system, which includes:

The resource allocation notification module on the network side is used to allocate resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for CoMPUE are the same as for non- The SRS resources allocated by the CoMPUE are orthogonal;

The resource allocation result notification module on the network side is configured to notify the UE of the resource allocation result;

The SRS signal determining module of the UE is configured to determine the SRS signal; and

The sending module of the UE is configured to send the SRS signal on the SRS resource allocated by the network side.

The method and system of the present invention eliminate the interference of the SRS signal of the non-CoMPUE in the cooperation set to the CoMPSRS of the serving cell by orthogonalizing the resources used by the CoMPUE and non-CoMPUE, and further eliminate the CoMPUE by transforming the CoMPUE into a virtual cell. The interference between the SRS signals, through power adjustment, puncturing or shortening structure, eliminates the interference of the data signal of the UE in the cooperative set to the CoMPSRS, thereby improving the SRS channel from the CoMPUE to its coordinated cell in the CoMP system detection performance.

Description of drawings

FIG. 1 is a schematic diagram of interference encountered by CoMP SRS transmission in a CoMP system.

FIG. 2 is a schematic diagram of a method for sending a Sounding Reference Signal (SRS) according to Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a first method for determining an SRS signal by a UE when a virtual cell identifier is used in the present invention;

FIG. 4 is a schematic diagram of a second method for determining an SRS signal by a UE when a virtual cell identifier is used in the present invention;

FIG. 5 is a schematic diagram of a coordinated collective cell and a virtual cell in a CoMP system;

FIG. 6 is a schematic diagram of distinguishing CoMP users and non-CoMP users using cell-specific subframe configuration in an FDD system;

Fig. 7 is a schematic diagram of distinguishing CoMP users and non-CoMP users using comb configuration.

detailed description

Embodiment one

This embodiment provides a method for eliminating interference between an SRS signal sent by a non-CoMPUE and an SRS signal sent by a CoMPUE in a coordinated cell in a coordinated multi-point transmission system.

As shown in Figure 2, in this embodiment, the method for sending a sounding reference signal (SRS) includes:

Step 201: The network side allocates resources for the user equipment (UE) and notifies the UE. The allocated resources include resources for sending SRS signals (SRS resources for short), wherein the SRS resources allocated for CoMPUEs are the same as the SRS resources allocated for non-CoMPUEs. Orthogonal resources;

During specific implementation, resource allocation can be implemented by the base station, and notified to the UE through high-layer signaling or physical layer signaling.

The UEs in the cooperation set are divided into two parts, all CoMP UEs are one part, and all non-CoMP UEs are the other part. According to CoMP and non-CoMPUE, available SRS resources are divided into two orthogonal parts, one part is used by CoMPUE, and the other part is used by non-CoMPUE. The resources used by the CoMPUE and the non-CoMPUE may be allocated in the time domain or allocated in the frequency domain.

Step 202: Determine the SRS signal, and send the SRS signal on the SRS resource allocated by the network side.

Preferably, the network side is configured through subframe configuration or spectrum comb (Comb, in R8, comb can be equal to 0 or 1, respectively representing that the SRS signal occupies a subcarrier at an odd position or an even position in the frequency domain) configuration The way to realize SRS resource orthogonality. Further, the configured subframe may be a cell-specific (cell-specific) subframe or a user equipment-specific (UE-specific) subframe.

Further, ways to realize SRS resource orthogonality include but are not limited to the following ways:

Orthogonal in time domain: the network side selects different subframe configuration indexes for CoMPUE and non-CoMPUE (as shown in Table 1), so that the subframe allocated by any CoMPUE is orthogonal to the subframe allocated for any non-CoMPUE, and also That is, the intersection of the set of subframes allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE is empty, see application examples 1 and 2 below for details;

Orthogonal in the frequency domain: the intersection of the set of Combs allocated to the CoMPUE by the network side and the set of Combs allocated to the non-CoMPUE is empty, see Application Example 3 below for details.

Embodiment two

This embodiment provides a method for eliminating interference of SRS signals between CoMPUEs in a coordinated multi-point transmission system.

The difference from Embodiment 1 is that the network side regards all CoMP UEs in the CoMP cooperating set as a virtual cell, and utilizes the fact that there is no interference inside the cell in LTE, and adopts a resource allocation method similar to a common cell in LTE. Resource allocation, that is, through TDM (TimeDivisionMultiplexing, time division multiplexing), FDM (Frequency-division multiplexing, frequency division multiplexing), comb (spectrum comb) configuration or CS (CyclicShift, cyclic shift) configuration to achieve SRS interference between CoMPUEs eliminate.

When the UE determines the SRS signal to be sent, it needs to first determine the cell identity (ID) to be used, and then determine the SRS signal. The process of determining the SRS signal preferably has the following two methods:

Way 1, as shown in Figure 3, includes the following steps:

Step 301: The network side and the UE set default cell identification rules for determining the SRS signal, wherein the CoMPUE uses a virtual cell ID to determine the SRS signal, and the non-CoMPUE uses the actual physical cell ID to determine the SRS signal;

The virtual cell ID has been agreed between the base station and the UE.

Step 302: The network side sends indication information to the UE, where the indication information is used to indicate the CoMP attribute of the UE;

Preferably, the base station may issue 1-bit identification signaling to the UE to indicate whether the UE receiving the signaling is a CoMPUE or a non-CoMPUE, where 0 indicates that the UE is not a CoMPUE, and 1 indicates that the UE is a CoMPUE,

Step 303: The UE determines to use the cell identity according to the indication information sent by the network side, and further determines the SRS signal.

The UE judges whether it is a CoMPUE or a non-CoMPUE according to the received signaling content. 303a. If it is a CoMPUE, the UE uses the virtual ID to obtain the SRS signal (also called an SRS sequence) to be sent. 303b. If it is a non-CoMPUE Then use the ID of the actual physical cell to obtain the SRS signal to be sent. In addition, UEs that have not received the signaling are non-CoMP UEs by default.

Method 2, as shown in Figure 4, includes the following steps:

Step 401: The network side sends indication information to the UE, where the indication information is used to indicate the cell identity used by the UE to determine the SRS signal; where if the UE is a CoMP UE, indicate the use of a virtual cell ID , if it is a non-CoMPUE, it indicates the use of the actual physical cell ID;

The network side directly sends a signaling indicating the cell ID used by the UE to each UE, wherein the value of the cell ID in the signaling content may be a virtual cell ID or an actual physical cell ID where the UE is located. In addition, UEs that have not received the signaling are non-CoMP UEs by default.

Step 402: The UE determines a cell identity according to the indication information sent by the network side, and further determines the SRS signal.

According to the received signaling, the UE uses the cell ID indicated by the signaling to obtain the SRS signal to be sent. 402a, the UE is a CoMPUE, and determines the SRS signal using a pre-agreed virtual ID; 402b, the UE is a non-CoMPUE , using the actual physical cell ID to determine the SRS signal.

Embodiment Three

This embodiment provides a method for eliminating interference of a data signal in a coordinated cell to a CoMPSRS signal of a serving cell in a coordinated multi-point transmission system.

The resources allocated by the network side also include resources for sending data signals. The difference from Embodiment 2 is that if the network side implements SRS resource orthogonality through subframe configuration, the resources allocated by the network side for sending data signals When resources are available, the network side instructs the UE of the coordinated cell to reduce the power of the data signal or release the last symbol on the corresponding resource block on the resource where the CoMPUE of the serving cell sends the SRS signal, specifically including:

The serving cell in the cooperating set notifies its cooperating cell of the resource information that the CoMPUE of the cell sends the SRS signal;

The coordinated cell sends indication information to the UE in the cell according to the received resource information, to instruct the UE in the cell to reduce the transmission power of the data signal or release the last symbol of the corresponding resource block on the corresponding resource where the UE in the cell sends the SRS signal in the CoMPUE of the serving cell;

When the UE in the coordinated cell transmits the data signal, the transmission power of the data signal is reduced or the last symbol of the corresponding resource block is released on the corresponding resource where the CoMP UE of the serving cell transmits the SRS signal.

In the above embodiments, the network elements that perform resource allocation in the serving cell and the coordinated cell are not the same network element. If they are the same network element, the network element that performs resource allocation on the network side directly sends an instruction to the CoMPUE in the serving cell.

The data signal is mainly sent on the PUSCH channel. According to the instructions of the coordinated cell, the UE reduces the transmission power of the PUSCH on the corresponding resource, or punctures the PUSCH on the resource, or adopts a shortened structure on the PUSCH on the resource.

Wherein, puncturing the PUSCH means deleting the original data on the last symbol of each RB of the PUSCH, and adopting a shorten structure for the PUSCH means not sending any data on the last symbol of each RB of the PUSCH.

Embodiment Four

This embodiment provides a method for eliminating SRS interference in a coordinated multi-point transmission system.

As shown in Figure 5, the cells in the cooperating set include cell1, cell2 and cell3, and the cooperating cells of cell1 are cell2 and cell3, the cooperating cells of cell2 are cell1 and cell3, and the cooperating cells of cell3 are cell1 and cell2. According to the concept of the present invention, in this embodiment, resource allocation on the network side includes the following aspects:

1. The network side allocates and sends SRS signals to all CoMPUEs in these three cells (including CoMPUEs in cell1, CoMPUEs in cell2, and CoMPUEs in cell3) in the manner of allocating resources for UEs in common cells in R8/9 resource.

All CoMPUEs in these three cells are regarded as a virtual cell with a virtual ID. In the virtual cell, the CoMPUE follows the resource allocation method in the common cell in R8/9 to achieve orthogonality, that is, the virtual ID is obtained according to the The network resources of the network are orthogonalized through TDM, FDM, comb or CS configuration.

2. The network side uses two parts of orthogonal resources to allocate resources to all CoMPUEs and all non-CoMPUEs in the three cells;

The virtual cell and cells1-3 respectively use two parts of orthogonal resources to implement SRS interference cancellation of CoMPUE and non-CoMPUE.

3. The network side instructs the UE in the coordinated cell to reduce the power of the data signal on the resource where the CoMPUE of the serving cell sends the SRS signal or release the last symbol on the corresponding resource block.

The UE in the coordinated cell reduces the PUSCH power of the cell, punctures or adopts a shortened structure on the corresponding resources of the CoMP SRS of the serving cell, so as to eliminate the interference of the data signal of the coordinated cell to the SRS signal sent by the CoMP UE.

Application example 1

This application example gives a specific illustration of realizing the orthogonality of SRS resources between CoMPUE and non-CoMPUE by making CoMPUE and non-CoMPUE in the cooperative set use different cell-specific subframe configurations in an FDD system .

Table 1 is the SRScell-specific subframe configuration in the FDD system in the 3GPP TS36.211 protocol.

Table 1 cell-specific subframe configuration in FDD system

Observing Table 1, it can be concluded that many groups of completely orthogonal cell-specific subframe configurations (a subframe configuration corresponds to the period and subframe offset of an SRS signal, that is, the subframes that can be used to send SRS signals in each frame are determined. frame), for example, the subframe configurations {1, 2, 10, 12} are completely orthogonal, and the subframe configurations {3, 4, 5, 6, 8, 10, 11, 12} are completely orthogonal , the subframe configurations {5, 6, 7, 8, 11, 12} are completely orthogonal, and the subframe configurations {2, 4, 5, 6, 8, 9, 10, 11, 12} are completely orthogonal Pay, wait. In these orthogonal subframe configuration sets, a part of subframe configurations are selected according to different granularities according to system conditions for use by virtual cells, and correspondingly other subframe configurations in the orthogonal subframe configuration sets are used for serving cells and coordinated cells.

For example, as shown in Figure 6, four subframe configurations with different granularities of 1, 3, 7, and 9 are used for the SRS transmission of the virtual cell, and the serving cell and the cooperating cell select the subframe configuration that is exactly the same as the subframe configuration used by the virtual cell. The assigned subframe configuration is used as its cell-specific subframe configuration. For example, if the virtual cell selects subframe configuration 1, then the serving cell and the cooperating cell select the cell-speicific subframe configuration from {2, 10, 12}; if the virtual cell selects subframe configuration 3, the serving cell and the cooperating cell select a cell-specific subframe configuration from {4, 5, 6, 8, 10, 11, 12}; if the virtual cell selects subframe configuration 7, the serving cell and the cooperating cell select from { 5, 6, 8, 11, 12} to select a subframe configuration; if the virtual cell selects subframe configuration 9, the serving cell and the cooperating cell will start from {2, 4, 5, 6, 8, 10, 11, 12} choose one. Subframe configurations 0, 13 and 14 are not orthogonal to any configuration, so they cannot be used for SRS transmission by CoMPUEs.

By means of this subframe configuration, SRS zero interference between CoMPUEs and non-CoMPUEs in the coordinated set cell can be realized.

Application example 2

This application example shows that in a TDD system, one or more fixed cell-specific subframe resources are reserved for CoMPUEs in the cooperating set, while non-CoMPUEs use the remaining cell-specific subframe resources in the cell where they are located to send SRS , realize the orthogonality between CoMPUE and non-CoMPUE, that is, make the intersection of the set of subframes allocated for CoMPUE and the set of subframes allocated for non-CoMPUE be empty, realize the orthogonality between CoMPUE and non-CoMPUE Specific indications of intercourse.

Table 2 is the SRScell-specific subframe configuration in the TDD system in the 3GPPTS36.213 protocol, and Table 3 is the uplink and downlink configuration in the TDD system in the 3GPPTS36.211 protocol.

Table 2 cell-specific subframe configuration in TDD system

Table 3 Uplink and downlink configuration of TDD system

In the above table, D indicates that the subframe is a downlink subframe, S indicates that the subframe is a special subframe, and U indicates that the subframe is an uplink subframe.

Observing Table 2, it can be seen that there is no completely orthogonal cell-specific subframe configuration in the TDD system, but there is also a feature, that is, the set of subframes that can be used to send SRS under any two cell-specific subframe configurations There are intersections between them. Assuming that under high-level configuration, the cell-specific subframe configurations of cell1, cell2 and cell3 are A1, A2 and A3 respectively, and A1∩A2∩A3=A. In fact, the existence of inter-cell SRS interference is caused by the non-empty subframe set A. In order to avoid non-CoMP UEs interfering with CoMP UEs, subframe set A or its subset A' can be allocated to all CoMPUEs (i.e. virtual cells) in cell1, cell2, and cell3, while the remaining subframes in A1, A2, and A3 The frames are respectively used by other non-CoMP UEs in these three cells.

For example, when the cell-specific subframe configurations of cell1, cell2, and cell3 are 0, 1, and 2 respectively, and their uplink and downlink configurations are all configuration 1, it can be seen from Table 2 and Table 3 that A1∩A2∩A3={1, 6} , and both subframes 1 and 6 can be used for uplink signal transmission. According to the concept of the present invention, subframe 1 can be used for virtual cells, and subframes other than subframe 1 can be used for other non-CoMPUEs in the serving cell and coordinated cells, that is, non-CoMPUEs in cell1 use subframes In frame set A1/1, non-CoMP UEs in cell2 use subframe set A2/1, and non-CoMPUEs in cell3 use subframe set A3/1. Among them, Ai/1 refers to the remaining element set after deleting element 1 in the set Ai.

Through this way of subframe configuration, the intersection of the set of subframes allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE is empty, so that the CoMPUE and non-CoMPUE in the coordinated set cell can also be implemented. SRS zero interference between CoMPUEs.

Application example 3

This application example gives a specific illustration of realizing frequency domain orthogonality between CoMPUE and non-CoMPUE by using different comb configurations for CoMPUE and non-CoMPUE in the cooperating set.

Take RPF (RePetitionFactor, that is, repetition factor) = 2 as an example

CoMPUE and non-CoMPUE each use a comb, for example, CoMPUE uses comb=0, and non-CoMPUE can only use the other one, that is, comb=1; or CoMPUE uses comb=1, and non-CoMPUE can only use another one, that is, comb =0.

Take RPF=4 as an example

Let the CoMPUE and the non-CoMPUE each use two of the combs, for example, the CoMPUE uses comb=0&2, and the non-CoMPUE uses comb=1&3, as shown in FIG. 7 .

Alternatively, let the CoMPUE and the non-CoMPUE respectively use one comb and three combs or use three combs and one comb respectively.

Regardless of the value of the RPF, when the network side allocates resources, as long as the intersection of the set of Combs allocated for the CoMPUE and the set of Combs allocated for the non-CoMPUE is empty, the purpose of eliminating interference can be achieved.

The method in this embodiment is applicable to both the FDD system and the TDD system.

Based on the above embodiments and application examples, the present invention can also be described as a resource allocation method, which includes:

A) The network side allocates resources for the user equipment (UE), and the allocated resources include resources for sending SRS signals (referred to as SRS resources), wherein the SRS resources allocated for the CoMPUE are orthogonal to the SRS resources allocated for the non-CoMPUE;

B) The network side notifies the UE of the resource allocation result.

As mentioned above, the network side can implement SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration. That is, the intersection of the set of subframes allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE is empty, or the set of Combs allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE are empty. The intersection of sets of Combs allocated by non-CoMPUEs is empty.

The network side allocates SRS resources to the CoMPUEs in the coordinated set cell by adopting the resource allocation method inside the LTE common cell, which can avoid the interference between the SRS signals sent by the CoMPUEs.

Further, the resources allocated by the network side also include resources for sending data signals, and if the network side implements SRS resource orthogonality through subframe configuration, when allocating resources for sending data signals, indicate the coordination set The UE of the cooperating cell reduces the transmission power of the data signal or releases the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal.

Specifically, the step in which the network side instructs the UE of the coordinated cell of the coordinated set of cells to reduce the transmission power of the data signal or release the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell transmits the SRS signal includes:

The serving cell notifies its cooperating cell of the resource information of the CoMPUE sending the SRS signal in the cell;

The coordinated cell sends indication information to the UE in the cell according to the received resource information, so as to instruct the UE in the cell to reduce the transmission power of the data signal or release the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal ;

When the UE in the coordinated cell transmits the data signal, the transmission power of the data signal is reduced or the last symbol of the corresponding resource block is released on the corresponding resource where the CoMP UE of the serving cell transmits the SRS signal.

The manner of releasing the last symbol of the corresponding resource block includes puncturing or adopting a shortened (Shorten) structure.

Understandably, the above network-side functions may be implemented in the base station.

Corresponding to the foregoing method, the present invention also provides a coordinated multi-point transmission (CoMP) system, the system comprising:

The resource allocation module on the network side is used to allocate resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (SRS) (SRS resources for short), wherein the SRS resources allocated for CoMPUE are the same as for non-CoMPUE The allocated SRS resources are orthogonal;

The resource allocation result notification module on the network side is configured to notify the UE of the resource allocation result;

The SRS signal determining module of the UE is configured to determine the SRS signal; and

The sending module of the UE is configured to send the SRS signal on the SRS resource allocated by the network side.

Further, the resource allocation module implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration.

Specifically, the intersection of the set of subframes allocated by the resource allocation module for the CoMPUE and the set of subframes allocated for the non-CoMPUE is empty, or the set of Comb allocated by the network side for the CoMPUE The intersection with the set of Combs allocated for the non-CoMP UE is empty.

Further, the resource allocation module on the network side allocates SRS resources for the CoMPUE in the coordinated set cell by adopting the internal resource allocation mode of the common cell of the long-term evolution (LTE) system.

Corresponding to the method shown in Figure 3, the network side and the UE set the cell identification rules for determining the SRS signal by default, wherein the CoMPUE uses the virtual cell ID to determine the SRS signal, and the non-CoMPUE uses the actual physical cell ID to determine the SRS signal Signal;

The network side also includes an indication information sending module, configured to send indication information to the UE, where the indication information is used to indicate the CoMP attribute of the UE;

The SRS signal determination module of the UE is configured to determine the cell identity to be used according to the indication information sent by the network side, and further determine the SRS signal.

Corresponding to the manner shown in FIG. 4 , the network side further includes an indication information sending module, configured to send indication information to the UE, where the indication information is used to indicate the cell used by the UE to determine the SRS signal Identification; where if the UE is a CoMPUE, indicate the use of a virtual cell ID, and if it is a non-CoMPUE, indicate the use of an actual physical cell ID;

The SRS signal confirmation module of the UE determines the cell identity according to the indication information sent by the network side, and further determines the SRS signal.

When SRS resource orthogonality is realized through subframe configuration, in order to avoid the interference of data signals on SRS signals, the resources allocated by the resource allocation module on the network side also include resources for sending data signals, which are allocated for sending data signals It is also used to instruct the UE of the cooperating cell in the cooperating set to reduce the transmission power of the data signal or release the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal.

In addition, the present invention also provides a base station, which includes:

The resource allocation module is configured to allocate resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for CoMPUE are the same as the SRS allocated for non-CoMPUE Orthogonal resources;

A resource allocation result notification module, configured to notify the UE of the resource allocation result.

Preferably, the base station implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration.

The resource allocation module of the base station allocates SRS resources for the CoMPUE in the coordinated set cell by adopting the internal resource allocation mode of the common cell of the long-term evolution (LTE) system.

Further, the resources allocated by the resource allocation module of the base station also include resources for sending data signals, and if SRS resource orthogonality is realized through subframe configuration, when allocating resources for sending data signals, it is also used to indicate The UE of the coordinated cell in the coordinated set reduces the transmission power of the data signal or releases the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell transmits the SRS signal.

The method, system, and base station of the present invention eliminate the interference of the SRS signal of the non-CoMPUE in the cooperating set on the CoMPSRS of the serving cell by orthogonalizing the resources used by the CoMPUE and non-CoMPUE, and further eliminate the interference by making the CoMPUE a virtual cell The interference between the SRS signals of the CoMPUE is eliminated, and the interference of the data signal of the UE in the cooperation set in the cooperation set to the CoMP SRS is eliminated through power adjustment, puncturing or shortening, thereby improving the CoMP UE in the CoMP system. SRS channel sounding performance.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. 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 (17)

1. A resource allocation method, characterized in that the method comprises: The network side allocates resources for the user equipment (UE), and the allocated resources include resources for sending sounding reference signals (referred to as SRS resources), wherein the SRS resources allocated for the CoMPUE are orthogonal to the SRS resources allocated for the non-CoMPUE; The network side notifies the UE of the resource allocation result; The resources allocated by the network side also include resources for sending data signals. If the network side implements SRS resource orthogonality through subframe configuration, when allocating resources for sending data signals, indicate the coordinated cells of the coordinated set The UE reduces the transmission power of the data signal on the corresponding resource for the CoMPUE of the serving cell to transmit the SRS signal. 2. The method according to claim 1, characterized in that: the network side implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration. 3. The method according to claim 1 or 2, wherein the intersection of the set of subframes allocated by the network side for the CoMPUE and the set of subframes allocated for the non-CoMPUE is empty, or the set The intersection of the set of Combs allocated by the network side to the CoMPUE and the set of Combs allocated to the non-CoMPUE is empty. 4 . The method according to claim 1 , wherein the network side allocates SRS resources for the CoMPUE in the coordinated set cell by adopting a resource allocation method within an LTE common cell. 5 . 5. The method according to claim 1, wherein the network side instructs the UE of the coordinated cell of the coordinated collective cell to reduce the transmission power of the data signal or release the last resource block of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal. A symbolic step consists of: The serving cell notifies its cooperating cell of the resource information of the CoMPUE sending the SRS signal in the cell; The coordinated cell sends indication information to the UE in the cell according to the received resource information, so as to instruct the UE in the cell to reduce the transmission power of the data signal or release the last symbol of the corresponding resource block on the corresponding resource where the CoMPUE of the serving cell sends the SRS signal ; When the UE in the coordinated cell transmits the data signal, the transmission power of the data signal is reduced or the last symbol of the corresponding resource block is released on the corresponding resource where the CoMP UE of the serving cell transmits the SRS signal. 6. The method according to claim 5, wherein: releasing the last symbol of the corresponding resource block comprises punching holes or adopting a shortened (Shorten) structure. 7. A base station, characterized in that the base station comprises: The resource allocation module is configured to allocate resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for CoMPUE are the same as the SRS allocated for non-CoMPUE Orthogonal resources; A resource allocation result notification module, configured to notify the UE of a resource allocation result; The resources allocated by the resource allocation module of the base station also include resources for sending data signals. If SRS resource orthogonality is realized through subframe configuration, when allocating resources for sending data signals, it is also used to indicate the cooperating set The UE in the coordinated cell reduces the transmission power of the data signal on the resource corresponding to the SRS signal sent by the CoMPUE in the serving cell. 8 . The base station according to claim 7 , wherein the base station implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration. 9. The system according to claim 7, characterized in that: the resource allocation module of the base station adopts the internal resource allocation mode of the common cell of the long-term evolution (LTE) system to allocate SRS resources for the CoMPUE in the coordinated set cell. 10. A method for sending a sounding reference signal (SRS), characterized in that the method comprises: The network side allocates resources for the user equipment (UE) and notifies the UE that the allocated resources include resources for sending SRS signals (referred to as SRS resources), where the SRS resources allocated for CoMP UEs are orthogonal to the SRS resources allocated for non-CoMP UEs ; The UE determines the SRS signal, and sends the SRS signal on the SRS resource allocated by the network side; Wherein, the step of determining the SRS signal by the UE includes: The network side and the UE set default cell identification rules for determining the SRS signal, wherein the CoMPUE uses a virtual cell ID to determine the SRS signal, and the non-CoMPUE uses an actual physical cell ID to determine the SRS signal; The network side sends indication information to the UE, where the indication information is used to indicate the CoMP attribute of the UE; The UE determines to use the cell identity according to the indication information sent by the network side, and further determines the SRS signal; Or, the step of the UE determining the SRS signal includes: The network side sends indication information to the UE, where the indication information is used to indicate the cell identity used by the UE to determine the SRS signal; where if the UE is a CoMP UE, it indicates the use of a virtual cell ID, and if it is If it is not a CoMPUE, it indicates the use of the actual physical cell ID; The UE determines the cell identity according to the indication information sent by the network side, and further determines the SRS signal. 11. The method according to claim 10, wherein the resource allocation module implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration. 12 . The method according to claim 10 , wherein the network side allocates SRS resources for the CoMPUEs in the coordinated aggregated cells by adopting a resource allocation method within an LTE common cell. 13 . 13. A coordinated multi-point transmission (CoMP) system, characterized in that the system comprises: The resource allocation notification module on the network side is used to allocate resources for user equipment (UE), and the allocated resources include resources for sending sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for CoMPUE are the same as for non- The SRS resources allocated by the CoMPUE are orthogonal; The resource allocation result notification module on the network side is configured to notify the UE of the resource allocation result; The SRS signal determining module of the UE is configured to determine the SRS signal; and The sending module of the UE is configured to send the SRS signal on the SRS resource allocated by the network side; The resources allocated by the resource allocation module on the network side also include resources for sending data signals. If SRS resource orthogonality is realized through subframe configuration, when allocating resources for sending data signals, it is also used to indicate the cooperation set The UE in the coordinated cell reduces the data signal transmission power on the corresponding resources where the CoMPUE of the serving cell sends the SRS signal. 14. The system according to claim 13, wherein the resource allocation module implements SRS resource orthogonality through subframe configuration or spectrum comb (Comb) configuration. 15. The system according to claim 13, characterized in that: the resource allocation notification module on the network side adopts the internal resource allocation mode of the common cell of the Long Term Evolution (LTE) system to allocate SRS resources for the CoMPUE in the coordinated set cell. 16. The system according to claim 15, characterized in that: the network side and the UE set default cell identification rules for determining the SRS signal, wherein the CoMPUE uses a virtual cell ID to determine the SRS signal, and the non-CoMPUE uses The actual physical cell ID determines the SRS signal; The network side also includes an indication information sending module, configured to send indication information to the UE, where the indication information is used to indicate the CoMP attribute of the UE; The SRS signal determination module of the UE is configured to determine the cell identity to be used according to the indication information sent by the network side, and further determine the SRS signal. 17. The system according to claim 15, characterized in that: the network side further comprises an indication information sending module, configured to send indication information to the UE, the indication information is used to instruct the UE to determine The cell identity of the SRS signal; if the UE is a CoMPUE, it indicates the use of a virtual cell ID, and if it is a non-CoMP UE, it indicates the use of an actual physical cell ID; The SRS signal confirmation module of the UE determines the cell identity according to the indication information sent by the network side, and further determines the SRS signal.