WO2012109901A1

WO2012109901A1 - Method for sending sounding reference signal, resource allocation method and system, and base station

Info

Publication number: WO2012109901A1
Application number: PCT/CN2011/080035
Authority: WO
Inventors: 弓宇宏; 孙云锋; 郭森宝; 郑勇; 任敏
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-02-18
Filing date: 2011-09-22
Publication date: 2012-08-23
Also published as: CN102647789B; CN102647789A

Abstract

A resource allocation method and a method for sending a Sounding Reference Signal (SRS), a base station, and a Coordinated Multi-Point (CoMP) transmission system. The resource allocation method includes: the network side allocates resources to User Equipment (UE), wherein the allocated resources include resources for sending the SRS, i.e. SRS resources, and the SRS resources allocated to CoMP UE are orthogonal to those allocated to non-CoMP UE; and the network side notifies the UE of the resource allocation result. The method and device improve the SRS channel sounding performance from the CoMP UE to the coordinated cell thereof in the CoMP system.

Description

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

Technical field

The present invention relates to a sounding reference signal (SRS) transmission technique, and in particular, to a method for transmitting an SRS signal, a resource allocation method, a system, and a base station.

Background technique

In the current LTE-A (Long Term Evolution-Advanced) system, the performance difference between the cell edge user equipment (UE, User Equipment) and the cell center UE is still a major problem. Although the use of multi-antenna technology can increase the data rate at the cell center, it is difficult to improve the performance of the cell edge. Due to the low bandwidth of the cell edge, it is difficult to support multi-stream transmission. Therefore, as the number of antennas used by 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 mode that can be used in the cell center is also difficult to use at the cell edge, resulting in the cell center. The performance difference with the cell edge is getting bigger and bigger.

Therefore, the LTE-A system will improve cell edge performance as one of its main indicators. In order to improve the transmission rate at the cell edge, 3GPP has introduced CoMP (Coordinated Multi-Point) transmission technology. It mainly improves the data transmission rate of the edge UE through the cooperation between 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 such a UE as a CoMP UE, otherwise called a non-CoMP UE or a non-CoMP UE), in order for the eNB to make reasonable resource scheduling, The CoMP UE needs to simultaneously transmit SRS information measurement uplink channel state information to the serving cell and the coordinated cell. In addition, in the CoMP TDD system, the SRS is an effective feedback scheme, and the CoMP UE also needs to simultaneously send the SRS to the serving cell and the coordinated cell to enable the eNB to obtain corresponding downlink channel state information. However, when the CoMP UE transmits the SRS signal to the coordinated cell in the uplink, it is often interfered by the data or SRS signal of the user in the coordinated cell, especially the SRS signal. This is due to the cell-specific design of the SRS sequence group. The SRS-based sequences used by the UEs in the neighboring cells are from different sequence groups, and may have different sequence lengths or partial overlaps in frequency, so that the sequences are mutually The correlation is large and the interference is severe, which causes the SRS channel detection performance between the CoMP UE and its coordinated cell to be seriously degraded. As shown in Figure 1, CoMP UE The serving cell in the uplink is celll and the cooperating cell is cell2. The SRS sounding performance for the CoMP UE→celll channel is acceptable because there is no interference within the cell of LTE. However, the SRS detection performance of the CoMP UE→cell2 channel is greatly reduced due to strong interference, because the SRP signal of the CoMP UE has experienced a large fading from cell1 to cell2 itself, and more seriously, the CoMP UE and other interfering UEs (UEl) -4) The SRS sequences used are from different sequence groups, may have different sequence lengths, and there are partial frequency overlaps, resulting in a strong cross-correlation between them, and thus there is strong interference.

The degradation of CoMP performance caused by SRS interference caused by such SRS sequence cross-correlation may even "offset" the benefits of using CoMP. Summary of the invention

In order to solve the above technical problem, a method, a resource allocation method, a system, and a base station for transmitting a sounding reference signal in a multipoint coordinated transmission system are needed to solve the interference problem of the SRS signal.

A resource allocation method, the method comprising:

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

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

The step of the SRS resource allocated by the network side to the CoMP UE is orthogonal to the SRS resource allocated to the non-CoMP UE. The network side is configured to be allocated by the CoMP UE by using a subframe configuration or a comb comb configuration. The SRS resource is orthogonal to the SRS resource allocated for the non-CoMP UE.

The step of the network side being orthogonal to the SRS resource allocated by the CoMP UE and the SRS resource allocated to the non-CoMP UE by using the subframe configuration or the frequency comb (Comb) configuration includes: the network side being the CoMP UE The intersection of the set of allocated subframes and the set of subframes allocated for the non-CoMP UE is empty, or the set of Comb allocated by the network side for the CoMP UE and the Comb allocated by the non-CoMP UE The intersection of the sets is empty.

The method further includes: the network side allocates the SRS resource to the CoMP UE in the coordinated set cell by using a resource allocation manner in the LTE common cell. The resource allocated by the network side further includes a resource for transmitting a data signal. If the network side implements orthogonality of the SRS resource by using a subframe configuration manner, when the resource for transmitting the data signal is allocated, the collaboration set is indicated. The UE of the coordinated cell reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource of the serving cell's CoMP UE transmitting the SRS signal.

Wherein, the network side indicates the CoMP of the UE of the coordinated cell of the coordinated set cell in the serving cell

The step of reducing the data signal transmission power or releasing the last symbol of the corresponding resource block on the corresponding resource of the SRS signal sent by the UE includes:

The serving cell informs its coordinated cell that the CoMP UE of the local cell sends the resource information of the SRS signal;

The coordinated cell sends the indication information to the UE of the local cell according to the received resource information, to indicate that the UE of the local cell reduces the data signal transmission power or releases the last one of the corresponding resource blocks on the corresponding resource of the CoMP UE transmitting the SRS signal of the serving cell. Symbol

When the coordinated cell UE sends the data signal, the CoMP UE of the serving cell sends the SDMA signal to reduce the data signal transmission power or release the last symbol of the corresponding resource block.

The step of releasing the last symbol of the corresponding resource block includes:

The last symbol of the corresponding resource block is released by puncturing, that is, the transmitting end transmits data on the last symbol, but the receiving end does not decode the data on the symbol; or

Use the Shorten structure to release the last symbol of the corresponding resource block, ie not send any data on the last symbol.

A base station, the base station includes: a resource allocation module and a resource allocation result notification module, where: the resource allocation module is configured to: allocate resources for a user equipment (UE), where the allocated resources include a sounding reference signal (SRS) Resource (referred to as SRS resource), wherein the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE;

The resource allocation result notification module is configured to: notify the UE of the resource allocation result.

A method of transmitting a sounding reference signal (SRS), the method comprising:

The network side allocates resources to the user equipment (UE) and notifies the UE, and the allocated resources include resources for transmitting SRS signals (referred to as SRS resources), wherein the SRS resources allocated for the CoMP UEs The source is orthogonal to the SRS resource allocated for the non-CoMP UE; signal. '',', wherein the network side allocates SRS resources to CoMP UEs in the coordinated set cell by using a resource allocation manner inside the LTE normal cell.

The step of the UE determining the SRS signal includes:

The network side and the UE are configured by default to determine a cell identification rule for the SRS signal, where the CoMP UE determines the SRS signal by using the virtual cell ID, and the non-CoMP UE determines the SRS signal by using the actual physical cell ID;

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

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

The step of the UE determining the SRS signal includes:

The network side sends the indication information to the UE, where the indication information is used to indicate the cell identifier used by the UE to determine the SRS signal. If the UE is a CoMP UE, the virtual cell ID is used. If it is a non-CoMP UE, it indicates that the actual physical cell ID is used;

Determining, by the UE, the cell identifier according to the indication information sent by the network side, and further determining the SRS signal.

A multi-point coordinated transmission (CoMP) system, the system includes: a resource allocation notification module on the network side, a resource allocation result notification module on the network side, a SRS signal determination module of the UE, and a sending module of the UE, where: the resource allocation The notification module is configured to: allocate resources for the user equipment (UE), where the allocated resources include resources for transmitting sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for the CoMP UE are allocated to the non-CoMP UEs. SRS resources are orthogonal;

The resource allocation result notification module is configured to: notify the UE of the resource allocation result; the SRS signal determining module is configured to: determine an SRS signal; The sending module is configured to: send the SRS signal on an SRS resource allocated by the network side.

A resource allocation method, the method comprising:

The network side allocates resources for the user equipment (UE), and the allocated resources include resources for transmitting sounding reference signals (SRS), that is, SRS resources, where the SRS resources allocated for the CoMP UE are orthogonal to the SRS resources allocated for the non-CoMP UEs. ;

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

In the foregoing resource allocation method, the steps of the SRS resource allocated by the network side for the CoMP UE and the SRS resource allocated for the non-CoMP UE are:

The SRS resource allocated to the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE by using the subframe configuration or the frequency comb (Comb) configuration;

The step of the network side being configured to be orthogonal to the SRS resource allocated by the CoMP UE and the SRS resource allocated to the non-CoMP UE by the network side includes: the set of the subframes allocated by the network side to the CoMP UE is The intersection of the set of the subframes allocated by the non-CoMP UE is empty; or the step of the network side being implemented by the Comb configuration to be orthogonal to the SRS resources allocated by the CoMP UE and the SRS resources allocated for the non-CoMP UE includes: The intersection of the set of Combs allocated by the network side for the CoMP UE and the set of Comb allocated to the non-CoMP UE is empty.

The foregoing resource allocation method further includes: the network side allocates SRS resources to CoMP UEs in the coordinated set cell by using a resource allocation manner in a Long Term Evolution (LTE) common cell.

In the foregoing resource allocation method, the resource allocated by the network side further includes a resource for transmitting a data signal;

The resource allocation method further includes: when the network side allocates the SRS resource allocated by the CoMP UE to the SRS resource allocated to the non-CoMP UE by using the subframe configuration manner, when the network side allocates the resource used for sending the data signal The UE indicating the coordinated cell of the coordinated set reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource of the serving cell's CoMP UE transmitting the SRS signal.

In the foregoing resource allocation method: the UE on the network side indicating the coordinated cell of the coordinated set cell is in service The step of reducing the data signal transmission power or releasing the last symbol of the corresponding resource block on the corresponding resource of the CoMP UE transmitting the SRS signal of the serving cell includes:

In the foregoing resource allocation method, the step of releasing the last symbol of the corresponding resource block includes: releasing the last symbol of the corresponding resource block by punching, that is, the transmitting end transmits data on the last symbol, but the receiving end does not transmit data on the symbol. Decode; or,

A base station, the base station includes: a resource allocation module and a resource allocation result notification module, where: the resource allocation module is configured to: allocate resources for a user equipment (UE), where the allocated resources include a sounding reference signal (SRS) The SRS resource, where the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE;

In the foregoing base station, the base station is configured to implement, in the following manner, that the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE: a subframe configuration or a Comb configuration.

In the foregoing base station, the resource allocation module is configured to: allocate a SRS resource to a CoMP UE in a coordinated set cell by using a resource allocation manner in a normal cell of a Long Term Evolution (LTE) system.

In the foregoing base station, the resource allocated by the resource allocation module of the base station further includes a resource for transmitting a data signal; The resource allocation module is further configured to: when the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE by using the subframe configuration manner, when the resource for transmitting the data signal is allocated, the cooperation of the cooperation set is indicated The UE of the cell reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource in which the CoMP UE of the serving cell transmits the SRS signal.

分配 Allocating resources to the user equipment (UE) using the above resource allocation method; ' ' , , , wherein: the step of the UE determining the SRS signal includes:

The UE determines to use the cell identifier according to the indication information, and further determines the SRS signal.

Wherein: the step of the UE determining the SRS signal includes:

The network side sends the indication information to the UE, where the indication information is used to indicate that the UE is used to determine a cell identifier of the SRS signal. If the UE is a CoMP UE, the virtual cell ID is used. If it is a non-CoMP UE, it indicates that the actual physical cell ID is used;

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

A multi-point coordinated transmission (CoMP) system, the system includes: the foregoing base station, an SRS signal determining module of the UE, and a sending module of the UE, where:

The SRS signal determining module is configured to: determine an SRS signal; and

The sending module is configured to: send the SRS letter on an SRS resource allocated by the network side number.

The base station is located at the network side, and the base station and the UE are configured by default to determine a cell identification rule of the SRS signal, where the CoMP UE determines the SRS signal by using the virtual cell ID, and the non-CoMP UE uses the actual physical cell. ID determines the SRS signal;

The base station further includes an indication information sending module, where the indication information sending module is configured to: send the indication information to the UE, where the indication information is used to indicate a CoMP attribute of the UE;

The SRS signal determining module of the UE is further configured to: determine, according to the indication information, use a cell identifier, and further determine the SRS signal.

Wherein: the base station further includes an indication information delivery module,

The indication information sending module is configured to: send the indication information to the UE, where the indication information is used to indicate that the UE is used to determine a cell identifier of the SRS signal; wherein, if the UE is a CoMP UE, the indication is Using the virtual cell ID, if it is a non-CoMP UE, indicating that the actual physical cell ID is used;

The SRS signal confirmation module is further configured to: determine a cell identity according to the indication information, and further determine the SRS signal.

The foregoing technical solution eliminates the interference of the SRS signal of the non-CoMP UE in the cooperative set to the CoMP SRS of the serving cell by orthogonalizing the resources used by the CoMP UE and the non-CoMP UE, and eliminates the CoMP UE by virtualizing the CoMP UE. The SRS signal between the SRS signals eliminates the interference of the data signals of the UEs in the cooperative set in the cooperative set to the CoMP SRS through the power adjustment, puncturing or shorten structure, thereby improving the CoMP UE to cooperate in the CoMP system. SRS channel sounding performance of the cell.

BRIEF abstract

Figure 1 is a schematic diagram of interference experienced by CoMP SRS transmission in a CoMP system.

2 is a schematic diagram of a method for transmitting a sounding reference signal (SRS) according to the first embodiment of the present invention; FIG. 3 is a schematic diagram of a method 1 for determining, by the UE, an SRS signal in the case of using a virtual cell identifier according to an embodiment of the present invention; 4 is a schematic diagram of a second method for determining, by the UE, an SRS signal in the case of using a virtual cell identifier according to an embodiment of the present invention;

5 is a schematic diagram of a cooperative aggregation cell and a virtual cell in a CoMP system;

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

Figure 7 is a schematic diagram of distinguishing CoMP users from non-CoMP users using a comb configuration. Preferred embodiment of the invention

Embodiment 1

This embodiment provides an interference cancellation method for an SRS signal transmitted by a non-CoMP UE in a coordinated cell in a coordinated multi-point coordinated transmission system to a SRS signal transmitted by a CoMP UE.

As shown in FIG. 2, in this embodiment, a method for sending an SRS signal includes:

Step 201: The network side allocates resources to the UE and notifies the UE, and the allocated resources include resources for transmitting SRS signals (referred to as SRS resources), where the SRS resources allocated for the CoMP UE and the SRS resources allocated for the non-CoMP UE are positive. Pay

When implemented, resource allocation can be implemented by the base station, and notified by high layer signaling or physical layer signaling.

UE.

The UEs in the cooperative set are divided into two parts, all CoMP UEs are part, and all non-CoMP UEs are another part. According to the CoMP and the non-CoMP UE, the available SRS resources are divided into two orthogonal parts, one for the CoMP UE and the other for the non-CoMP UE. The resources used by the CoMP UE and the non-CoMP UE may be partitions in the time domain or partitions in the frequency domain.

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

Preferably, the network side is implemented by using a subframe configuration or a spectrum comb (Comb) configuration.

SRS resources are orthogonal. The configured subframe may be a cell-specific subframe or a UE-specific subframe. Among them, Comb, in R8, comb can be equal to 0 or 1, respectively, representing that the SRS signal occupies subcarriers at odd or even positions in the frequency domain. The methods for implementing orthogonality of SRS resources include, but are not limited to, the following methods:

Time domain orthogonal: The network side selects different subframe configuration indexes for the CoMP UE and the non-CoMP UE (as shown in Table 1), so that the subframe allocated for any CoMP UE and the child allocated for any non-CoMP UE The frame is orthogonal, that is, the intersection of the set of subframes allocated by the network side for the CoMP UE and the set of subframes allocated for the non-CoMP UE is empty, as described in the following application examples 1 and 2;

Frequency domain orthogonal: The intersection of the set of Combs allocated by the network side for the CoMP UE and the set of Combs allocated to the non-CoMP UE is empty, as described in Application Example 3 below.

Embodiment 2

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

Different from the first embodiment, the network side regards all CoMP UEs in the CoMP cooperative set as one virtual cell, and uses the intra-cell in LTE to have no interference, and uses the resource allocation in an ordinary cell in LTE. The method performs resource allocation, that is, through Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), Frequency-division multiplexing (FDM), comb configuration or cyclic shift (CS, Cyclic Shift) configuration to implement between CoMP UEs. The SRS interference is eliminated.

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

The first method, as shown in Figure 3, includes the following steps:

Step 301: The network side and the UE set the cell identification rule for determining the SRS signal by default, where the CoMP UE determines the SRS signal by using the virtual cell ID, and the non-CoMP UE determines the SRS signal by using the actual physical cell ID.

The virtual cell ID is already agreed by 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 a CoMP attribute of the UE.

Preferably, the base station may send the lbit identification signaling to the UE, where it is used to indicate that the signaling is received. Whether the UE is a CoMP UE or a non-CoMP UE, where 0 indicates that the UE is not a CoMP UE, and 1 indicates that the UE is a CoMP UE,

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

The UE determines whether it is a CoMP UE or a non-CoMP UE according to the received signaling content.

303a. If it is a CoMP UE, the UE obtains an SRS signal (also referred to as an SRS sequence) to be transmitted by using a virtual ID, and 303b, and if it is a non-CoMP UE, obtains an SRS signal to be transmitted by using the actual physical cell ID. In addition, the UE that does not receive the signaling defaults to a non-CoMP UE.

The second method, as shown in Figure 4, includes the following steps:

Step 401: The network side sends the indication information to the UE, where the indication information is used to indicate the cell identifier used by the UE to determine the SRS signal. If the UE is a CoMP UE, the virtual cell is indicated to be used. ID, if it is a non-CoMP UE, indicates that the actual physical cell ID is used;

The network side directly sends a signaling to the UE indicating the cell ID used by the UE, where the value of the cell ID in the signaling content may be the virtual cell ID or the actual physical cell ID where the UE is located. In addition, the UE that does not receive the signaling defaults to a non-CoMP UE.

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

The UE obtains an SRS signal to be transmitted according to the received cell ID by using the cell ID indicated by the signaling, 402a, the UE is a CoMP UE, and determines a SRS signal by using a pre-agreed virtual ID; 402b, the UE is non- The CoMP UE determines the SRS signal using the actual physical cell ID.

Embodiment 3

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

The resource allocated by the network side further includes a resource for transmitting a data signal. Different from the second embodiment, if the network side implements orthogonality of SRS resources by using a subframe configuration manner, the network side is allocated to send a data signal. When the resource is located, the network side indicates that the UE of the coordinated cell reduces the data signal power or releases the corresponding resource block on the resource that the CoMP UE of the serving cell sends the SRS signal. The last symbol, including:

The serving cell in the cooperative set notifies its coordinated cell to the resource information of the CoMP UE of the local cell to send the SRS signal;

The coordinated cell sends the indication information to the UE of the local cell according to the received resource information, to indicate that the UE in the local cell reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource in which the CoMP UE of the serving cell sends the SRS signal. ;

In the foregoing embodiment, the network element that performs resource allocation between the serving cell and the coordinated cell is not the same network element. If the network element is the same network element, the network element that directly allocates resources by the network side sends an indication to the CoMP UE of the serving cell.

The data signal is mainly sent on a Physical Uplink Shared Channel (PUSCH) channel. According to the indication of the coordinated cell, the UE reduces the transmission power of the PUSCH on the corresponding resource or puncturing the PUSCH on the resource or The PUSCH on the resource uses the shorten structure. The so-called puncturing means that the transmitting end transmits data on the last symbol, but the receiving end does not decode the data on the symbol; the so-called Shorten structure means that no data is transmitted on the last symbol.

The puncturing of the PUSCH refers to erasing the original data on the last symbol of each RB of the PUSCH, and the shortening structure for the PUSCH means not transmitting any data on the last symbol of each RB of the PUSCH.

Embodiment 4

This embodiment provides an SRS interference cancellation method in a coordinated multi-point transmission system.

As shown in FIG. 5, the cells in the coordinated set include cell1, cell2, and cell3, and the coordinated cells of cell1 are cell2 and cell3, the coordinated cells of cell2 are cell1 and cell3, and the coordinated cells of cell3 are cell1 and cell2. In this embodiment, when the network side allocates resources, the following aspects are included: 1 . The network side uses R8/9 to allocate resources to UEs in a common cell, and is all CoMP UEs in the three cells (including CoMP UE in cell1, CoMP UE in cell2, and CoMP UE in cell3) Allocate resources for sending SRS signals.

All the CoMP UEs in the three cells are regarded as one virtual cell, and have a virtual ID. In the virtual cell, the CoMP UE implements orthogonality according to the resource allocation manner in the common cell in R8/9, that is, according to the virtual ID. The obtained network resources are orthogonalized by means of TDM, FDM, comb or CS configuration.

2. The network side allocates resources for all CoMP UEs and all non-CoMP UEs in the three cells by using two orthogonal resources respectively;

The virtual cell and the cell 1~3 respectively use two orthogonal resources to implement the SRS dry elimination of the CoMP UE and the non-CoMP UE.

3. The network side indicates that the UE of the coordinated cell reduces the data signal power or releases the last symbol on the corresponding resource block on the resource that the CoMP UE of the serving cell sends the SRS signal.

The UE of the coordinated cell reduces the PUSCH power, puncturing or shortening structure of the local cell on the corresponding resource of the serving cell CoMP SRS, and implements interference cancellation of the coordinated cell data signal on the SRS signal sent by the CoMP UE.

Application example 1

The application example shows that in the FDD system, the SRP resources between the CoMP UE and the non-CoMP UE are orthogonalized by using different cell-specific subframe configurations for the CoMP UE and the non-CoMP UE in the cooperation set respectively. Specific indication of sex.

Table 1 is the SRS cell-specific subframe configuration in the FDD system in the 3GPP TS 36.211 protocol. 1 cell-specific subframe configuration in the FDD system

4 VV

5 V V

6 V V

7 V V V V

8 V V V V

9 V

10 V

11 V

12 V

13 V V V V V V V

14 V V V V V V V V

15

Observe Table 1, where there are many sets of completely orthogonal cell-specific subframe configurations (one subframe configuration corresponds to the period of one SRS signal and the subframe offset, that is, the subframes that can be used to transmit the SRS signal in each frame are determined. For example, the subframe configuration {1, 2, 10, 12} is completely orthogonal, and the subframe configuration {3, 4, 5, 6, 8, 10, 11, 12} is completely orthogonal. Subframe configuration {5,6,7,8,11, 12} is completely orthogonal, and sub-frame configuration is completely orthogonal between {2,4,5,6,8,9,10,11, 12} , and many more. A plurality of subframe configurations are selected for use by the virtual cell according to system conditions according to different granularities in the orthogonal subframe configuration set, and other subframe configurations in the orthogonal subframe configuration set are correspondingly used by the serving cell and the coordinated cell.

For example, as shown in FIG. 6, subframes of four different granularities of 1, 3, 7, and 9 are configured for SRS transmission of a virtual cell, and the serving cell and the coordinated cell select a subframe configuration for use with the virtual cell. The intersected subframe configuration is configured as its cell-specific subframe. For example, if the virtual cell selects the subframe configuration 1, the serving cell and the coordinated cell select the cell-speicific subframe configuration from {2, 10, 12}; if the virtual cell selects the subframe configuration 3, the serving cell And the coordinated cell selects a cell-specific subframe configuration from {4, ⁵ , 6, ⁸ , 10, ¹¹ , 12}; if the virtual cell selects the subframe configuration 7, the serving cell and the coordinated cell are from { 5,6,8,11, 12} select one subframe configuration; if the virtual cell selects subframe configuration 9, the serving cell and the coordinated cell are from {2, 4, 5, 6, 8, 10, 11, Choose one of 12}. Subframe configurations 0, 13, and 14 are not orthogonal to any configuration and therefore cannot be used for SRS transmission by CoMP UEs.

Through such a subframe configuration, SRS zero interference between the CoMP UE and the non-CoMP UE in the coordinated aggregation cell can be implemented. Application example 2

This application example shows that in a TDD system, one or more cell-specific subframe resources are reserved for CoMP UEs in a coordinated set, while non-CoMP UEs use remaining cell-specific subframe resources in the cell in which they are located. Transmitting the SRS to implement orthogonality between the CoMP UE and the non-CoMP UE, that is, the intersection of the set of subframes allocated for the CoMP UE and the set of subframes allocated for the non-CoMP UE is null, implementing the CoMP UE and A specific illustration of the orthogonality between non-CoMP UEs.

Table 2 is the SRS cell-specific subframe configuration in the TDD system in the 3GPP TS 36.213 protocol, and Table 3 is the uplink and downlink configuration of the TDD system in the 3GPP TS 36.211 protocol.

-specific subframe configuration

Uplink and downlink configuration of the 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.

It can be seen from Table 2 that there is no completely orthogonal cell-specific subframe configuration in the TDD system, but there is also a feature that the subframe set that can be used to transmit the SRS in any two cell-specific subframe configurations. There is an intersection between them. If in the upper layer configuration, the cell-specific subframe configurations of cell1, cell2, and cell3 are Al, A2, and A3, respectively, and Al nA2 nA3 = A. In fact, the existence of small-interval SRS interference is due to the fact that the subframe set A is not empty. In order to avoid the interference of the non-CoMP UE to the CoMP UE, the subframe set A or its subset A may be allocated to all CoMP UEs (ie, virtual cells) in cell1, cell2, and cell3, and Al, A2, and A3 may be used. The remaining subframes are used by other non-CoMP UEs in the three cells, respectively.

For example, when the cell-specific subframe configurations of cell1, cell2, and cell3 are 0, 1, and 2, respectively, the uplink and downlink configurations are configuration 1. As shown in Table 2 and Table 3, Α1 ηΑ2 ηΑ3 = {1, 6}, and Both subframes 1 and 6 can be used for uplink signaling. In the technical solution of the present invention, subframe 1 may be used for virtual cell use, and subframes other than subframe 1 are used by other non-CoMP UEs in the serving cell and the coordinated cell, that is, non- in cell1. The CoMP UE uses the subframe set Al/1, the non-CoMP UE in cell2 uses the subframe set A2/1, and the non-CoMP UE in cell3 uses the subframe set A3/1. Where Ai/1 refers to the set of remaining elements after the deletion of element 1 in the set Ai.

In this manner, the intersection of the set of subframes allocated by the network side for the CoMP UE and the set of subframes allocated to the non-CoMP UE is null, so that the CoMP UE in the coordinated set cell can also be implemented. SRS zero interference between the non-CoMP UE and the non-CoMP UE.

Application example 3 This application example shows a specific schematic of realizing frequency domain orthogonality between CoMP UEs and non-CoMP UEs by using Comp UEs and non-CoMP UEs in the cooperation set respectively to use different comb configurations.

Take RPF (Repetition Factor) = 2 as an example

The CoMP UE and the non-CoMP UE each use one comb, for example, the CoMP UE uses comb=0, and the non-CoMP UE can only use the other one, that is, comb=l; or the CoMP UE uses comb=l, and the non-CoMP UE can only Use the other one, ie comb==0.

Take RPF=4 as an example

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

Or, let the CoMP UE and the non-CoMP UE use one of the combs and three combs respectively or use three of the combs and one comb respectively.

Regardless of the value of the RPF, when the network side performs resource allocation, as long as it is ensured that the intersection of the set of Combs allocated to the CoMP UE and the set of Combs allocated to the non-CoMP UE 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, an embodiment of the present invention further provides a resource allocation method, where the method includes:

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

The SRS resources allocated by the UE are orthogonal;

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

As described above, the network side can implement SRS resource orthogonality by using a subframe configuration or a frequency (^) configuration. That is, the intersection of the set of subframes allocated by the network side for the CoMP UE and the set of subframes allocated for the non-CoMP UE is empty, or the set of Comb allocated by the network side to the CoMP UE is The intersection of the set of Combs allocated for the non-CoMP UE is empty.

The network side allocates the SRS resource to the CoMP UE in the coordinated set cell by using the resource allocation mode in the LTE common cell, and can avoid the interference between the SRS signals sent by the CoMP UE. The resource allocated by the network side further includes a resource for transmitting a data signal. If the network side implements the SRS resource orthogonally by using a subframe configuration manner, when the resource for transmitting the data signal is allocated, the collaboration of the collaboration set is indicated. The UE of the cell reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource in which the CoMP UE of the serving cell transmits the SRS signal.

The last symbolic way of releasing the corresponding resource block includes puncturing or shortening the short structure.

Understandably, the above network side functions can be implemented at the base station.

Corresponding to the foregoing method, an embodiment of the present invention further provides a coordinated multi-point transmission (CoMP) system, where the system includes: a resource allocation module on the network side, a resource allocation result notification module on the network side, and an SRS signal determining module of the UE. And the sending module of the UE, where:

The resource allocation module is configured to: allocate resources for user equipment (UE), where the allocated resources include resources for transmitting sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for the CoMP UEs are non-CoMP The SRS resources allocated by the UE are orthogonal;

The resource allocation result notification module is configured to: notify the UE of the resource allocation result;

The SRS signal determining module is configured to: determine an SRS signal;

The sending module is configured to: send the SRS signal on an SRS resource allocated by the network side. The resource allocation module is configured to implement, in the following manner, that the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE: configured by using a subframe configuration or a verb (Comb) configuration.

That is, the intersection of the set of subframes allocated by the resource allocation module for the CoMP UE and the set of subframes allocated for the non-CoMP UE is empty, or the Cob allocated by the network side to the CoMP UE The intersection of the set and the set of Combs allocated for the non-CoMP UE is empty.

The resource allocation module on the network side is further configured to: allocate a SRS resource to a CoMP UE in a coordinated set cell by using a resource allocation manner in a common cell of a Long Term Evolution (LTE) system.

Corresponding to the manner shown in FIG. 3, the network side and the UE are configured by default to determine a cell identification rule for the SRS signal, where the CoMP UE determines the SRS signal by using the virtual cell ID, and the non-CoMP UE uses the actual physical cell ID. Determining the SRS signal;

The network side further includes an indication information sending module, where the indication information sending module is configured to: send the indication information to the UE, where the indication information is used to indicate a CoMP attribute of the UE; and the SRS signal of the UE The determining module is further configured to: determine to use the cell identifier 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, where the indication information sending module is configured to: send indication information to the UE, where the indication information is used to indicate the UE Determining the cell identifier of the SRS signal; wherein if the UE is a CoMP UE, indicating that the virtual cell ID is used, and if it is a non-CoMP UE, indicating that the actual physical cell ID is used;

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

When the SRS resource is orthogonalized by the subframe configuration mode, the resource allocated by the resource allocation module further includes a resource for transmitting the data signal, and the resource allocation module is further configured to: When a resource for transmitting a data signal is allocated, the UE indicating the coordinated cell of the cooperative set reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource of the CoMP UE transmitting the SRS signal of the serving cell.

In addition, an embodiment of the present invention further provides a base station, where the base station includes: a resource allocation module and a resource allocation result notification module, where: The resource allocation module is configured to: allocate resources for user equipment (UE), where the allocated resources include resources for transmitting sounding reference signals (SRS) (referred to as SRS resources), wherein the SRS resources allocated for the CoMP UEs are non-CoMP The SRS resources allocated by the UE are orthogonal;

The resource allocation result notification module is configured to: notify the UE of the resource allocation result. Preferably, the resource allocation module is configured to implement, according to the following manner, that the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE: implemented as a CoMP by using a subframe configuration or a Comb configuration. The SRS resources allocated by the UE are orthogonal to the SRS resources allocated for the non-CoMP UEs.

The resource allocation module of the base station is further configured to: allocate a SRS resource to a CoMP UE in the coordinated set cell by using a resource allocation manner within a common cell of a Long Term Evolution (LTE) system.

The resource allocated by the resource allocation module of the base station further includes a resource for transmitting a data signal. If the SRS resource is orthogonalized by using a subframe configuration manner, the resource allocation module allocation of the base station is further set to: When the resource of the data signal is transmitted, the UE indicating the coordinated cell of the coordinated set reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource of the CoMP UE transmitting the SRS signal of the serving cell.

The method and system, the base station of the embodiment of the present invention, by using orthogonalization of resources used by the CoMP UE and the non-CoMP UE, cancels interference of the SRS signal of the non-CoMP UE in the cooperative set to the serving cell CoMP SRS, where The method of the virtual cellization of the UE eliminates the interference between the SRS signals of the CoMP UEs, and eliminates the interference of the data signals of the UEs in the cooperative set in the cooperative set to the CoMP SRS by means of power adjustment, puncturing or shorten structure, thereby improving the interference. SRS channel sounding performance of a CoMP UE to its coordinated cell in a CoMP system.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The above technical solution eliminates interference of the SRS signal of the non-CoMP UE in the cooperative set to the serving cell CoMP SRS by orthogonalizing resources used by the CoMP UE and the non-CoMP UE, wherein the manner of virtual cellifying the CoMP UE is eliminated. The interference between the SRS signals of the CoMP UEs eliminates the interference of the data signals of the UEs in the cooperative set in the cooperative set to the CoMP SRS through the power adjustment, puncturing or shorten structure, thereby improving the CoMP UE in the CoMP system to its cooperation. The SRS channel detection performance of the cell, and therefore the present invention has strong industrial applicability.

Claims

Claim

1. A resource allocation method, the method comprising:

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

2. The resource allocation method according to claim 1, wherein: the step of the SRS resource allocated by the network side for the CoMP UE and the SRS resource allocated for the non-CoMP UE is orthogonal to:

3. The resource allocation method according to claim 1, further comprising: the network side allocates SRS resources to CoMP UEs in the coordinated set cell by using a resource allocation manner within a Long Term Evolution (LTE) common cell.

The resource allocation method according to claim 1, wherein: the resource allocated by the network side further includes a resource for transmitting a data signal;

The method further includes: when the network side allocates the SRS resource allocated by the CoMP UE to the SRS resource allocated to the non-CoMP UE by using the subframe configuration manner, when the network side allocates the resource for sending the data signal, the indication The UE of the coordinated set of coordinated UEs reduces the data signal transmission power or releases the corresponding resource block on the corresponding resource of the serving cell's CoMP UE transmitting the SRS signal. The last symbol.

The resource allocation method according to claim 4, wherein the UE on the network side instructing the coordinated cell of the coordinated set cell reduces the data signal transmission power or releases the corresponding resource block on the corresponding resource of the CoMP UE transmitting the SRS signal of the serving cell. The steps of the last symbol include:

6. The resource allocation method according to claim 5, wherein: the step of releasing the last symbol of the corresponding resource block comprises:

7. A base station, the base station comprising: a resource allocation module and a resource allocation result notification module, wherein:

The resource allocation module is configured to: allocate a resource for a user equipment (UE), where the allocated resource includes a resource for transmitting a sounding reference signal (SRS), that is, an SRS resource, where the SRS resource allocated for the CoMP UE is a non-CoMP UE The allocated SRS resources are orthogonal;

8. The base station according to claim 7, wherein: the base station is configured to implement an SRS resource allocated for a CoMP UE orthogonal to an SRS resource allocated for a non-CoMP UE in the following manner: a subframe Configuration or frequency comb (Comb) configuration.

The base station according to claim 7, wherein: the resource allocation module is configured to: allocate a SRS resource to a CoMP UE in a coordinated set cell by using a resource allocation manner in a normal cell of a long-term evolution (LTE) system.

The base station according to claim 7, wherein: the resource allocated by the resource allocation module of the base station further includes a resource for transmitting a data signal;

The resource allocation module is further configured to: when the SRS resource allocated for the CoMP UE is orthogonal to the SRS resource allocated for the non-CoMP UE by using the subframe configuration manner, when the resource for transmitting the data signal is allocated, the cooperation of the cooperation set is indicated The UE of the cell reduces the data signal transmission power or releases the last symbol of the corresponding resource block on the corresponding resource in which the CoMP UE of the serving cell transmits the SRS signal.

11. A method of transmitting a sounding reference signal (SRS), the method comprising:

The resource allocation method according to any one of claims 1 to 6 for allocating resources to a user equipment (UE); a signal. ' - , , ,

12. The method of claim 11, wherein: the step of the UE determining the SRS signal comprises:

13. The method of claim 11, wherein: the step of determining, by the UE, the SRS signal Includes:

A multi-point coordinated transmission (CoMP) system, the system comprising: the base station according to any one of claims 7-10, the SRS signal determining module of the UE, and the transmitting module of the UE, where: The SRS signal determining module is configured to: determine an SRS signal;

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

The CoMP system according to claim 14, wherein: the base station is located at a network side, and the base station and the UE are configured by default to determine a cell identification rule of an SRS signal, where the CoMP UE determines by using a virtual cell ID. SRS signal, the non-CoMP UE determines an SRS signal by using an actual physical cell ID;

The CoMP system according to claim 14, wherein: the base station is located at a network side, and the base station further includes an indication information sending module,