WO2011057576A1

WO2011057576A1 - Method for configuring sounding reference signals

Info

Publication number: WO2011057576A1
Application number: PCT/CN2010/078677
Authority: WO
Inventors: 赵振山; 潘瑜; 池连刚; 赵爽; 彭木根
Original assignee: 普天信息技术研究院有限公司
Priority date: 2009-11-12
Filing date: 2010-11-12
Publication date: 2011-05-19
Also published as: CN101714897A; CN101714897B

Abstract

A method for configuring sounding reference signals (SRS) is provided in the prevent invention, which comprises the following steps: for each kind of configuration of SRS subframe configuration parameters, the configurations which are orthogonal to the kind of configuration are determined; all the configurations of SRS subframe configuration parameters are divided into three groups; all the cells are divided into three types according to the principle that each cell and its adjacent cells belong to cells of different types, then the three types of cells and the three groups of configurations of SRS subframe configuration parameters are arranged in one-to-one correspondence way; for each cell, according to the number and moving speeds of user equipments (UEs) and the principle that the configuration which is orthogonal to the SRS subframe configuration parameters of adjacent cells is selected preferably, one kind of configuration is selected from a group of configurations of the SRS subframe configuration parameters which corresponds to the cell, to configure the SRS subframe configuration parameters of the cell; for each cell, the SRS subframes occupied by each UE are set based on the SRS subframe configuration parameters of the cell. With the invention, the SRS interference between Coordinated Multi-Point (CoMP) cells is effectively reduced and good compatibility with conventional systems is realized simultaneously.

Description

Probe reference signal configuration method

Technical field

The present invention relates to transmission techniques in mobile communication systems, and more particularly to sounding reference signals

(Sounding Reference Signal, SRS) configuration method. Background of the invention

In order to cope with the market competition of WiMAX standards and realize the integration of mobile communication and broadband wireless access technologies, the 3rd Generation Partnership Project (3GPP) organization launched the Long Term Evolution (LTE) project. LTE replaces the third-generation mobile communication system (3G) code division multiple access (CDMA) method with frequency division multiple access (OFDM/FDMA) in the air interface. Reducing latency, increasing user data rates, improving system capacity, and covering and reducing operator costs are important goals for LTE.

The Long Term Evolution-Advanced (LTE-A) system proposes the use of Coordinated Multi-Point (CoMP) transmission to improve the coverage of the high data rate of the cell, the cell edge throughput and / or improve system throughput. The principle of CoMP is mainly to reduce interference between cells by joint processing or coordinated scheduling of multiple cells. There are two types of CoMP: Joint Processing and Coordinated Scheduling Beamforming. Both of these methods require certain information interaction between cells that cooperate with each other.

The Reference Signal (RS) is a known signal that is provided by the transmitting end to the receiving end for channel estimation or channel sounding. In the LTE-A system, SRS is used for uplink channel estimation to implement uplink frequency domain scheduling. In addition, the SRS in the data transmission bandwidth of the user equipment (User Equipment, UE) can be used for data demodulation, and the SRS also helps the timing of the UE in narrowband or low frequency uplink transmission. For more efficient scheduling, CoMP users Not only the SRS needs to be sent to the serving cell, but also the SRS needs to be sent to the coordinated cell.

In the Rel-8 version of the 3GPP technical specification, the subframe position for the user to send the SRS is as follows: Each cell has a dedicated SRS sequence group, and the subframe in which the user sends the SRS in each cell passes the cell carried by the cell exclusive broadcast signaling. The dedicated parameters, namely the SRS sub-frame configuration parameter ( srsSubframeConfiguration ), are configured, and each cell independently configures its own SRS subframe configuration parameters. The SRS subframe configuration parameters have 16 configurations (that is, 16 values), each configuration is indicated by 4 bits, and each configuration corresponds to one subframe set, and the subframe included in each seed frame set is performed by the period and the offset Δ. Specifically, specifically, the set of subframes included in each seed frame set may be expressed by the formula: { _3⁄4 : « modr _src e A _src }, where _s/ is a subframe number. The period r _src and offset Δ corresponding to each configuration are listed in Table 1.

Table 1

As shown in Table 1, when the SRS subframe configuration parameter takes any value from "0000" to "1110", it indicates that the subframe in the subframe set corresponding to the value can be utilized in each radio frame. The frame transmits the SRS, and when the SRS subframe configuration parameter takes the value of "1111", it indicates that the SRS sent by the user in the cell is turned off, and the value is applicable to a scenario in which a cell mainly serves a user who moves at a high speed, because, The fast time-varying characteristics of the channel will make the result of the channel estimation unreliable. Therefore, it is necessary to turn off the SRS sent by the user in the cell at this time. In the subframe in which the cell-specific parameter configuration can be used to transmit the SRS, the SRS is always set to be transmitted on the last SC-FDMA symbol, and on the SC-FDMA symbol, the location is not allowed to transmit the PUSCH even if the user does not transmit the SRS. The data information, thereby preventing interference to other users who send SRS at the symbol.

The SRS mechanism defined in the above 3GPP technical specification Rel-8 version is not suitable for direct application in the CoMP context. The reason is: When a CoMP user of a serving cell sends an SRS to a coordinated cell, a non-CoMP user in the coordinated cell needs to send an SRS because of normal communication, and such a user cannot perceive the existence of the CoMP user, and thus, The case where the CoMP user of the serving cell and the user of the coordinated cell transmit the SRS in the same subframe position. However, although the SRS sequences in the same cell may be orthogonal, when the CoMP user of the serving cell and the user of the coordinated cell send the SRS in the same subframe position, the difference between the basic sequence and the sequence length of the different SRS sequence groups is Therefore, the orthogonality cannot be satisfied between them, so that the SRS signals transmitted by the non-CoMP users and the CoMP users will strongly interfere with each other when the base station receives, which seriously affects the accuracy of the channel estimation. This will be exemplified by taking FIG. 1 as an example. As shown in FIG. 1, when CoMP UE1 in cell 1 and UE (UE2 and UE3) in cell 2 transmit SRS parameters at a position indicated by an elliptical solid line, interference will occur, and UE2 and cell 2 belonging to cell 2 When UE3 transmits the SRS parameter at the position indicated by the elliptical dotted line, no interference occurs. In order to solve the SRS interference problem of the above CoMP interval, it is proposed in the 3GPP proposal R1-092367 that a new SRS sequence design can be considered for CoMP users to pass the SRS sequence of the non-CoMP users of the CoMP user and the coordinated cell. Mutual orthogonality to reduce SRS interference between CoMP cells, although this idea can achieve orthogonal expectations, but contrary to the LTE-A backward compatibility, the protocol needs to be very modified, and needs to be quite fine The design can guarantee the orthogonality of SRS between CoMP users and LTE users, so it is not feasible. Summary of the invention

In view of this, the main object of the present invention is to provide a method for configuring a sounding reference signal, which can effectively reduce SRS interference between multi-point coordinated cells, and has good compatibility with existing systems.

In order to achieve the above object, the technical solution proposed by the present invention is:

A method for configuring a sounding reference signal (SRS), the method comprising the steps of: a. determining, for each configuration of an SRS subframe configuration parameter, a configuration orthogonal to the configuration, where the orthogonality corresponds to each of the two configurations The same subframe does not exist in the subframe set;

b. All the configurations of the SRS subframe configuration parameters are grouped, and the configuration of the three sets of SRS subframe configuration parameters is obtained.

c. According to the principle that each cell and its neighboring cells belong to different types of cells, all cells are classified into three types, and the configuration of the three types of cells and the three sets of SRS subframe configuration parameters are paired with JsL;

d. For each cell, according to the number of user terminals (UEs) in the current cell and the moving speed of the UE, according to the principle of preferentially selecting the configuration of the SRS subframe configuration parameters of the neighboring cells, In the configuration of a set of SRS subframe configuration parameters corresponding to the cell, selecting a configuration of the SRS subframe configuration parameter of the local cell; e. Each cell sets an SRS subframe occupied by each UE in the cell according to the SRS configuration index parameter according to the subframe set corresponding to the SRS subframe configuration parameter of the current cell.

Preferably, after the step e, the method further comprises:

f. Each cell notifies the coordinated cell of the multi-point coordinated UE in the SRS subframe occupied by the coordinated UE in the cell, and when the coordinated cell schedules the UE in the cell, avoiding the multiple The uplink data is transmitted on the last symbol on the SRS subframe occupied by the coordinated UE.

Preferably, the step d and e further include:

x. determining whether the configuration of the SRS subframe configuration parameter between the cells having the cooperative relationship is orthogonal, if not, according to the SRS subframe configuration of the non-multi-point coordinated UE of the coordinated cell and the coordinated UE of the serving cell The principle that the SRS subframe configuration is orthogonal, the SRS subframe configuration range of the non-multipoint coordinated UE of each cell having the cooperative relationship and the SRS subframe configuration range of the coordinated UE are set;

The step e is:

For each cell, if the SRS subframe configuration range of the non-multipoint coordinated UE of the current cell and the SRS subframe configuration range of the coordinated UE are set in step _e , the non-multipoint coordinated UE in the local cell In the subframe configuration range, the SRS configuration index parameter is used to set the SRS subframe occupied by each non-multipoint coordinated UE in the current cell, and the SRS configuration index parameter is set in the local cell within the multi-point coordinated UE subframe configuration range of the current cell. The SRS subframes occupied by the UEs in the local area are set in the SRS sub-frames of the UEs in the cell.

Preferably, the SRS subframe configuration range of the non-multipoint coordinated UEs of the cells having the cooperative relationship and the SRS subframe configuration range of the coordinated UE are:

For the largest cell max of the cooperative cells, - u(CF _max n O^) is used as the SRS subframe configuration of the coordinated UE of the cell, and CF u (CT _max n CF _; ) is configured as the SRS subframe of the non-multipoint coordinated UE of the cell, where , CF _; set the subframe corresponding to the SRS subframe configuration parameter of the cell, | ^ _χ | > |(^| , e {l, 2,..., /}, and ma _X , |CT;| SRS subframe configurable number of subframes set of parameters corresponding to, Γ = {p: cell _max there to the cell p is cooperative cell coordinated multipoint UE}, Φ = {cell g have cell max that collaborate Multi-point cooperation UE of the cell};

For each cell i other than the cell max among the I cells having the cooperative relationship, the SRS subframe configuration range of the non-multipoint coordinated UE of the current cell and the SRS subframe configuration range of the coordinated UE Set to the subframe set corresponding to the SRS subframe configuration parameter of the cell.

b. Select three or more configurations from all configurations with orthogonal configurations of the SRS subframe configuration parameter, and group the selected configurations, wherein the configurations in each group are orthogonal to the configurations in the other two groups. ;

C. According to the principle that each cell and its neighboring cells belong to different types of cells, all the cells are classified into three types, and the three types of cells are configured corresponding to the configuration parameters of the three sets of SRS subframes.

d. For each cell, according to the number of user terminals (UEs) in the current cell and the moving speed of the UE, select a SRS sub-group for the local cell from the configuration of a set of SRS subframe configuration parameters corresponding to the current cell. Frame configuration parameters are configured;

e. Each cell sets an SRS subframe occupied by each UE in the cell according to the SRS configuration index parameter according to the subframe set corresponding to the SRS subframe configuration parameter of the current cell. Preferably, after the step e, the method further comprises:

Notifying the coordinated cell of the multi-point coordinated UE that is occupied by the multi-point coordinated UE in the cell, the coordinated cell avoiding occupying by the multi-point coordinated UE when scheduling the UE in the cell The uplink data is transmitted on the last symbol on the SRS subframe.

In summary, the method for configuring the sounding reference signal proposed by the present invention can effectively reduce the overlap of the SRS subframes of the non-multi-point coordinated UEs of the coordinated UE and the coordinated cells thereof in the time domain. At the same time, the present invention can still adopt the frame structure of the existing LTE system, and does not modify the original system parameters themselves, but only limits the options of parameter values, so the existing system is good. Backward compatibility. Brief description

1 is a schematic diagram of inter-cell SRS interference in an existing system;

2 is a flowchart of a method for configuring an SRS according to Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a correspondence between a cell and an SRS subframe configuration parameter according to an embodiment of the present invention;

FIG. 4 is a flowchart of a method for configuring an SRS according to Embodiment 2 of the present invention. Mode for carrying out the invention

The present invention will be further described in detail below with reference to the drawings and specific embodiments.

The core idea of the present invention is: When performing cell-specific parameter level SRS configuration for each cell, that is, when configuring the SRS subframe configuration parameter, try to configure the cell to be orthogonal to the SRS subframe configuration parameters of its neighboring cell. Therefore, the SRS subframes of the non-multi-point coordinated UEs of the coordinated UE and the coordinated cell of the coordinated cell can be reduced in the time domain, so that the SRS interference between the coordinated cells can be effectively reduced. 2 is a flowchart of a method for configuring an SRS according to Embodiment 1 of the present invention. As shown in FIG. 2, the SRS configuration method in the first embodiment of the present invention mainly includes:

Step 201: Determine, for each configuration of the SRS subframe configuration parameter, a configuration orthogonal to the configuration.

Here, the orthogonality means that the same subframe does not exist in the subframe set corresponding to each of the two configurations.

In this step, each configuration of the existing SRS subframe configuration parameters needs to be determined, and the configuration orthogonal to the configuration (that is, the orthogonal configuration of the configuration) is determined, so that it can be orthogonal according to each configuration in the subsequent process. Configuring to configure the SRS subframe configuration parameters orthogonal to the neighboring cells for each cell to reduce the orthogonal configuration set of the non-multipoint coordinated UE configuration of the coordinated UE and its coordinated cell in the time domain. Description.

6,8}

{0,1,2,3,4,

14 1110 10 no

5,6,8}

15 1111 reservation reservation reservation

Table 2

The orthogonal configurations of configurations 0 ~ 14 are given in Table 2. For example, for configuration 1, there are three configurations of configuration 2, 10, and 12, and for configuration 0, since its subframe period is 1 subframe and the offset is 0 subframe, this means that All subframes will be included in the subframe set corresponding to configuration 0. Accordingly, the configuration that does not overlap with the subframe will not exist. Therefore, configuration 0 has no orthogonal configuration. Similarly, configurations 13 and 14 do not exist. Hand over the configuration. In addition, since configuration 15 is a reserved item, its corresponding orthogonal configuration is also undefined.

Step 202: Group all configurations of the SRS subframe configuration parameters to obtain configuration of three sets of SRS subframe configuration parameters.

In this step, all the configurations of the SRS subframe configuration parameters are divided into three groups, so as to configure the SRS subframe configuration parameters of each cell in the subsequent process, and ensure that the SRS subframe configuration parameters of each cell can be adjacent to the neighboring cells. The SRS subframe configuration parameters are different.

Preferably, the three sets of configurations may be divided according to the principle that the configuration of each group is orthogonal to the configuration in other groups. Thus, in step 204, the SRS subframe configuration parameters of each cell are configured. The configuration of the SRS subframe configuration parameter of the neighboring cell may be more easily selected to be orthogonal to the configuration of the SRS subframe configuration parameter of the neighboring cell, thereby facilitating further reduction of the configuration of the SRS subframe configuration parameters of different cells. Point the interference between the collaborative cells.

Step 203: According to the principle that each cell and its neighboring cells belong to different types of cells, all the cells are classified into three types, and the three types of cells are in one-to-one correspondence with the configurations of the three sets of SRS subframe configuration parameters.

In this step, all the cells are classified into three types, and each cell and its neighboring cells belong to different types of cells, and then the three types of cells are respectively associated with the three groups of SRSs determined in step 202. The subframe configuration parameter, correspondingly, is such that, for each cell, the configuration of the SRS subframe configuration parameters of the different groups corresponding to the neighboring cells respectively.

Specifically, the configuration relationship between the three types of cells and the three sets of SRS subframe configuration parameters may be specifically described by using the example in FIG. 3.

In Figure 3, the configuration of the three sets of SRS subframe configuration parameters are represented by A, B, and C, respectively, where ^ = {4, /1 ₂ } , B = {B ₁ , B ₂ , B ₃ , B ₄ , B ₅ } . c = {c _l , c ₂ , c _i , c _A , c ₅ ] , cell 1 uses configuration 4 in group _A , and neighboring cell in cell 1 uses configuration in group B or group C. The cell 2 is similar to the case of the cell 1. It can be seen that, by using the foregoing classification of the cell and the configuration of the SRS subframe configuration parameter, it can be ensured that the local cell and its neighboring cell respectively correspond to the configuration of different groups of SRS subframe configuration parameters.

Step 204: For each cell, according to the number of user terminals (UEs) in the current cell and the moving speed of the UE, according to the principle of preferentially selecting the configuration of the SRS subframe configuration parameters of the neighboring cells, In the configuration of a set of SRS subframe configuration parameters corresponding to the cell, a configuration is selected for the SRS subframe configuration parameter of the local cell.

In this implementation, for each cell, a person skilled in the art needs to determine the appropriate SRS time domain density of the cell according to the number of UEs in the cell and the moving speed of the cell UE, and determine the SRS time domain density according to the SRS time domain density. Appropriate configuration of the SRS subframe configuration parameters. For example, if the moving speed of the activated UE in the cell is slow or the number of users in the cell is small, the configuration of the SRS subframe configuration parameter with a larger period may be selected; otherwise, the configuration with a smaller period is selected.

In this step, for each cell, in the configuration range of a set of SRS subframe configuration parameters corresponding to the cell, the configuration of the SRS subframe configuration parameter of the cell is determined, because each cell and its neighboring cell are respectively separated by step 204. Corresponding to the configuration of different groups of SRS subframe configuration parameters, therefore, this step can make each cell and its neighboring cells have different configurations of SRS subframe configuration parameters. In addition, since this step is configured according to the principle of preferentially selecting the configuration of the SRS subframe configuration parameters of the neighboring cell, the SRS subframe configuration parameters of each cell are configured, so that each cell can be ensured to a large extent. The configuration of the SRS subframe configuration parameters orthogonal to the neighboring cells thereof can effectively reduce the interference of the coordinated multi-cell.

Further, if the configuration of the three sets of SRS subframe configuration parameters is divided according to the principle that the configuration of each group of SRS subframe configuration parameters is orthogonal to the configuration in other groups as much as possible in step 202, then for a group of SRS subframes For the configuration of the configuration parameters, there are more configurations orthogonal to the configurations of other groups, so that it is easier to select a configuration for each cell that can satisfy the configuration of the SRS subframe configuration parameters of the neighboring cell. "The configuration of this condition, thereby reducing the interference between multi-point coordinated cells to a greater extent.

It can be seen that, by using the orthogonality of the SRS parameters of the cell-specific layer (that is, the orthogonality of the SRS subframe configuration parameters), the SRS resources used by more cells can be distinguished from the neighboring cells in time. Therefore, the interference between the coordinated cells of multiple points can be effectively reduced. Further, for the case where the inter-cell SRS subframe configuration parameters cannot be orthogonal, the SRS subframe configuration range of the non-multipoint coordinated UEs of the cells and the SRS subframe configuration range of the multi-point coordinated UE may be set. The SRS subframe configuration of the non-multipoint coordinated UE of the coordinated cell is orthogonal to the SRS subframe configuration of the coordinated UE of the serving cell. Specifically, it can be implemented in step 204 by the following steps:

Determining whether the configuration of the SRS subframe configuration parameters between the cells having the cooperative relationship is orthogonal, if not, according to the SRS subframe configuration of the non-multipoint coordinated UE of the coordinated cell and the SRS of the coordinated UE of the serving cell The principle that the frame configurations are orthogonal, the SRS subframe configuration range of the non-multipoint coordinated UEs of the cells having the cooperative relationship and the SRS subframe configuration range of the coordinated UE are set.

This step can be implemented by a centralized controller.

Specifically, setting an SRS of the non-multipoint coordinated UE of each cell having a cooperative relationship The method of the subframe configuration range and the SRS subframe configuration range of the multi-point coordinated UE may be: for the |CF, . | largest cell max in the coordinated cell/cell, -υ( ^ _χ ηΟ^ ) as SRS subframe coordinated multi-point UE to the cell frame configuration, the CF u (CT _max _nCF;) as SRS subframe non-coordinated multi-point UE to the cell frame configuration, wherein, _(^; SRS subframe for the cell & apos The subframe set corresponding to the frame configuration parameter, | ^ _χ |>|(^| e{l,2,...,/}, and ≠max,|CF,| is the sub-sequence of the SRS subframe configuration parameter of the cell The number of subframes in the frame set, Γ={ p: the cell _max has a coordinated multi-homed UE with the cell p as the coordinated cell}, Φ = {the multi-point coordinated UE with the cell max as the coordinated cell in the cell}

For example, when /=3, the SRS subframe configuration range of the non-multipoint coordinated UEs of the three cells (cell 1, cell 2, and cell 3) having the cooperative relationship and the SRS subframe of the multipoint coordinated UE according to the above method The configuration range settings can be as follows:

table 3

In Table 3, it is assumed that |(^|>|( _3⁄4 |>|(^ ₃ |, that is, the number of subframes in the subframe set corresponding to the SRS subframe configuration parameter of the cell 1 is the largest. For each cell i other than the cell max among the I cells having the cooperative relationship, the SRS subframe configuration range of the non-multipoint coordinated UE of the current cell and the SRS subframe configuration range of the coordinated UE All are set to the subframe set CF corresponding to the SRS subframe configuration parameter of the cell _;

Step 205: Each cell sets an SRS subframe occupied by each UE in the cell according to the SRS configuration index parameter according to the subframe set corresponding to the SRS subframe configuration parameter of the current cell.

Here, after the configuration of the SRS subframe configuration parameter of each cell is completed in step 204, one or more subframes are selected to be allocated to each UE in the cell within the subframe set corresponding to the configuration, thereby Complete the SRS subframe configuration process.

Further, if the SRS subframe configuration range of the non-multi-point coordinated UE of the coordinated cell in which the SRS subframe configuration parameter cannot be orthogonal in step 204 and the SRS subframe configuration range of the coordinated UE are set, this step will be performed. Implemented in the following way:

For each cell, if the SRS subframe configuration range of the non-multipoint coordinated UE of the current cell and the SRS subframe configuration range of the coordinated UE are set in step 204, the non-multipoint coordinated UE in the local cell In the subframe configuration range, the SRS configuration index parameter is used to set the SRS subframe occupied by each non-multipoint coordinated UE in the current cell, and the SRS configuration index parameter is set in the cell within the multi-point coordinated UE subframe configuration range of the current cell. The SRS subframes occupied by the UEs in the local area are set in the SRS sub-frames of the UEs.

Through the above steps, it can be ensured that the SRS subframe configuration of the non-multi-point coordinated UE of the coordinated cell is orthogonal to the SRS subframe configuration of the coordinated UE of the serving cell, so that interference between the coordinated cells can be further avoided.

Further, after step 205, the following steps may be further included to further improve the effective suppression of inter-cell interference in the embodiment:

Each cell notifies the SRS subframe occupied by the coordinated UE in the local cell to the The coordinated cell of the multi-point coordinated UE, when the coordinated cell schedules the UE in the cell, avoids transmitting uplink data on the last symbol on the SRS subframe occupied by the coordinated multi-homing UE.

As can be seen from the technical solution in the first embodiment, the SRS parameters (that is, the SRS configuration index parameter) and the user-level SRS parameters (that is, the SRS configuration index parameter) of the cell-specific layer may be used in the first embodiment of the present invention. The configuration minimizes interference between cooperating cells. In the actual application, the SRS parameter configuration in the second embodiment of the present invention can be used to describe the SRS configuration method in the second embodiment of the present invention.

FIG. 4 is a flowchart of a method for configuring an SRS according to Embodiment 2 of the present invention. As shown in FIG. 4, the SRS configuration method in the second embodiment includes the following steps:

Step 401: Determine, for each configuration of the SRS subframe configuration parameter, a configuration orthogonal to the configuration.

The specific implementation of this step is the same as step 201, and details are not described herein again.

Step 402: Select three or more configurations from all configurations having orthogonal configurations of the SRS subframe configuration parameter, and group the selected configurations, where the configurations in each group are aligned with the configurations in the other two groups. cross.

In this step, in all configurations with orthogonal configurations, some or all of the configurations are selected to construct three sets of configurations, and the three sets of configurations need to meet the conditions: The configuration in each group is different from the configuration in the other two groups. Orthogonal, in this case, when each cell is configured by using a set of SRS subframe configuration parameters corresponding to each cell in step 405, the SRS subframe configuration parameter configured by each cell and the SRS subframe configuration parameter of the neighboring cell can be ensured. The orthogonality enables the SRS resources configured in each cell to be orthogonal in the time domain, so that interference between the coordinated cells can be avoided to the utmost extent.

How many configurations are specifically selected in this step to construct the above three sets of SRS subframe configuration parameters, Those skilled in the art can determine according to actual needs, as long as it can ensure that the selected configuration can construct three sets of configurations of SRS subframe configuration parameters that satisfy the above conditions.

Step 403: According to the principle that each cell and its neighboring cells belong to different types of cells, all the cells are classified into three types, and the three types of cells are in one-to-one correspondence with the configurations of the three sets of SRS subframe configuration parameters.

The specific implementation of this step is the same as that of step 203, and details are not described herein again.

Step 404: For each cell, according to the number of user terminals (UEs) in the current cell and the moving speed of the UE, select a SRS for the local cell from the configuration of a set of SRS subframe configuration parameters corresponding to the local cell. Subframe configuration parameters are configured.

Step 405: Each cell sets an SRS subframe occupied by each UE in the cell according to the SRS configuration index parameter according to the subframe set corresponding to the SRS subframe configuration parameter of the current cell.

Further, in order to further improve the effectiveness of the inter-cell interference in the embodiment, the step 405 may further include:

In conclusion, the above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for configuring a sounding reference signal (SRS), the method comprising the steps of:

a, for each configuration of the SRS subframe configuration parameter, determining a configuration orthogonal to the configuration, where the orthogonal is the same subframe in the subframe set corresponding to the two configurations;

c. According to the principle that each cell and its neighboring cells belong to different types of cells, all cells are classified into three types, and the three types of cells are configured corresponding to the configuration parameters of the three sets of SRS subframes.

d. For each cell, according to the number of user terminals (UEs) in the current cell and the moving speed of the UE, according to the principle of preferentially selecting the configuration of the SRS subframe configuration parameters of the neighboring cells, In the configuration of a set of SRS subframe configuration parameters corresponding to the cell, selecting a configuration of the SRS subframe configuration parameter of the local cell;

e. Each cell sets an SRS subframe occupied by each UE in the cell according to the SRS configuration index parameter according to the subframe set corresponding to the SRS subframe configuration parameter of the current cell.

2. The method according to claim 1, wherein the step e further comprises:

The method according to claim 1 or 2, wherein the step d and e further comprise: X. Determine whether the configuration of the SRS subframe configuration parameter between the cells having the cooperative relationship is orthogonal, if not, the SRS subframe configuration of the non-multi-point coordinated UE of the coordinated cell and the multi-point coordinated UE of the serving cell. The principle that the SRS subframe configuration is orthogonal, the SRS subframe configuration range of the non-multipoint coordinated UE of each cell having the cooperative relationship and the SRS subframe configuration range of the coordinated UE are set;

The step e is:

For each cell, if the SRS subframe configuration range of the non-multipoint coordinated UE of the current cell and the SRS subframe configuration range of the coordinated UE are set in step X, the non-multipoint cooperation in the cell is performed. In the UE subframe configuration range, the SRS configuration index parameter is used to set the SRS subframe occupied by each non-multi-point coordinated UE in the current cell, and the local area is configured in the multi-point coordinated UE subframe configuration range of the current cell, and the local resource is set by using the SRS configuration index parameter. The SRS sub-frames occupied by the UEs in the own cell are set in the SRS configuration index parameter in the range of the subframe set corresponding to the SRS sub-frame configuration parameter of the current cell.

The method according to claim 3, wherein the SRS subframe configuration range of the non-multipoint coordinated UEs of the cells having the cooperative relationship and the SRS subframe configuration range of the coordinated UE are:

For the |[^.|maximum cell max in the cell with the cooperative relationship, the dish--(^ _χ η α^) is configured as the SRS subframe of the multi-point coordinated UE of the cell,

CF^ - u (C ^ n C^) is used as the SRS subframe configuration of the non-multipoint coordinated UE of the cell, i'er and

Wherein, c^; is a subframe set corresponding to the configuration parameter of the cell/SRS subframe, |^ _χ | >|<^|

^ ^,... , and ^! ! ^, ^^ is the number of subframes in the subframe set corresponding to the SRS subframe configuration parameter of the cell ^, Γ = { ρ: the cell _max has a multi-point coordinated UE with the cell _p as the coordinated cell}, ={ 3⁄4: In the cell g, there is a cell max as a coordinated multi-point UE of the coordinated cell};

For each of the I cells having the cooperative relationship except for the cell max The cell i is configured to set the SRS subframe configuration range of the non-multi-point coordinated UE of the current cell and the SRS subframe configuration range of the multi-point coordinated UE to the subframe set α^ corresponding to the SRS subframe configuration parameter of the cell.

5. A method for configuring a sounding reference signal (SRS), the method comprising the steps of:

b. Select three or more configurations from all configurations with orthogonal configurations of the SRS subframe configuration parameters, and group the selected configurations to obtain configuration of three sets of SRS subframe configuration parameters; wherein, the configuration in each group Both are orthogonal to the configurations in the other two groups;

6. The method according to claim 5, wherein the step e further comprises: