WO2010124597A1

WO2010124597A1 - Sounding reference signal transmission method and apparatus in carrier aggregation scenario

Info

Publication number: WO2010124597A1
Application number: PCT/CN2010/072154
Authority: WO
Inventors: 张戎; 郝鹏; 张禹强; 王瑜新; 朱鹏; 喻斌
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-04-27
Filing date: 2010-04-23
Publication date: 2010-11-04
Also published as: CN101541029B; CN101541029A

Abstract

A sounding reference signal (SRS) transmission method and apparatus in carrier aggregation scenario are provided in the invention, being applied to an advanced long-term evolution system. The transmission method comprises: a base station configures a group or a plurality of groups of SRS configuration parameters for an uplink component carrier required to be measured by a user equipment in carrier aggregation scenario, and transmits the parameters to the user equipment (801); according to the received SRS configuration parameters, the user equipment transmits the SRS to the base station (802). The invention can maintain the compatibility with the user equipment of the long-term evolution system and optimize the performance in transmitting the measurement signal when the user equipment of the advanced long-term evolution system adopts the carrier aggregation technology.

Description

Method and device for transmitting measurement reference signal in case of carrier aggregation

Technical field

The present invention relates to the field of communications, and in particular, to a method and apparatus for transmitting an uplink measurement reference signal in the case of carrier aggregation. Background technique

The Sounding Reference Signal (SRS) is a signal used between a terminal device and a base station to measure channel state information (CSI). In a Long Term Evolution (LTE) system, a user equipment (UE) periodically transmits according to parameters such as bandwidth, frequency domain location, period, and subframe offset indicated by a base station (e-node-B, eNB). Upstream SRS. The eNB determines the uplink CSI of the UE according to the received SRS signal, and performs frequency domain selection scheduling, closed loop power control, and the like according to the obtained CSI.

In the LTE system, the SRS signal sent by the UE is obtained by cyclically shifting a root sequence K«). Different cyclic shifts are performed on the same root sequence to obtain different SRS sequences, and these are obtained. The SRS sequences are mutually orthogonal, so these SRS sequences can be assigned to different UEs for use. In LTE, the SRS sequence defines eight cyclic shifts, namely: 0, 1, 2, 3, 4, 5, 6, 7 , indicated by 3 bit signaling. That is to say, in the same time-frequency resource, the UE in the cell has 8 available code resources, and the eNB can configure up to 8 UEs to simultaneously send the SRS.

In the LTE system, the frequency domain bandwidth of the SRS signal is configured using a tree structure. Each SRS bandwidth configuration (SRS bandwidth configuration) corresponds to a tree structure, and the highest SRS bandwidth (SRS-Bandwidth) corresponds to the maximum bandwidth (or SRS bandwidth range) for this SRS bandwidth configuration. Table 1 to Table 4 show the SRS bandwidth allocation in different upstream bandwidth ranges. Take the SRS bandwidth configuration 1 in the table as an example. b = 0 is the 0 layer, which is the highest layer of the tree structure. The SRS bandwidth corresponding to this layer is the bandwidth corresponding to 32 resource blocks (RBs). The maximum SRS bandwidth of the SRS bandwidth is configured; b=l is 1 layer, the SRS bandwidth of this layer is the bandwidth corresponding to 16 RBs, and one SRS bandwidth of the upper layer is split into two 1 layer SRS bandwidths; b =2 is 2 layers, this layer SRS bandwidth is the bandwidth corresponding to 8 RBs, and one SRS bandwidth of the upper layer is split into 2 2 layers of SRS bandwidth; b = 3 is 3 layers, SRS of this layer The bandwidth is the bandwidth corresponding to 4 RBs. And an SRS bandwidth of the upper layer is split into two 3-layer SRS bandwidths, and its structure is as shown in FIG. In addition, the subcarriers of the SRS signal are placed at intervals in the same SRS band, that is, the SRS is transmitted in a comb structure, wherein the number of frequency combs is 2. As shown in FIG. 2, when each UE transmits an SRS, only one of the two frequency combs (comb=0 or comb=1) is used, and the UE only uses the subcarriers whose frequency domain index is even or odd (sub- Carrier ) Send SRS. This comb structure allows more users to transmit SRS signals within the same SRS bandwidth.

In the LTE system, the base station first allocates an SRS bandwidth allocation index c _SRS for all UEs in the cell, and determines which one of Tables 1 to 4 is used according to the number of RBs corresponding to the current uplink system bandwidth ( ^Ν ^ ). Then, according to the determination, the SRS bandwidth configuration used by the current cell can be determined. For a certain UE, the base station also assigns an SRS bandwidth index (or an index of the layer). The SRS bandwidth used by the UE can be obtained according to the SRS bandwidth allocation and bandwidth indexing in the cell. For example, if the current cell SRS bandwidth configuration index ^C ^=l , ^=50, the SRS bandwidth of the current cell is configured as the second row in Table 2. If the current cell allocates a bandwidth index of 1 for a certain UE, the SRS bandwidth of the UE occupies 16 RBs, and the location of the SRS bandwidth of the UE is within the range of the SRS bandwidth (that is, the range of the maximum SRS bandwidth is 48). RB).

After the UE obtains its own SRS bandwidth, it will determine the initial location of the SRS according to the upper layer signaling sent by the eNB. As shown in Figure 3, the UEs with different "signaling" will have different SRS bandwidths in the cell. The area sends the SRS.

When the frequency hopping of the UE is configured, the UE will transmit the SRS in different frequency bands within the system SRS bandwidth over time. During frequency hopping, the base station informs the UE of the hopping bandwidth with signaling b. The UE frequency hopping mode is based on different branches of the SRS bandwidth tree structure, and the SRS is transmitted in different areas within the hopping bandwidth. Taking the system SRS bandwidth configuration shown in FIG. 1 as an example, 4 that the UE-specific bandwidth configuration index ^=3 is used, the bandwidth of the SRS sent by the UE is 4 RBs. Suppose further that the UE sends the frequency domain location where the starting position of the SRS is _3⁄4c = o. Then, as shown in FIG. 4, the base station can configure different _bhops to indicate different hopping bandwidths of the UE. Table 1 (6<N^<40)

Table 2 ( 40 < N ≤ 60 )

Table 3 (60 < ≤ 80)

Table 4 (80< ≤110)

In LTE, from the time domain, the UE transmits the SRS only on the last single carrier frequency division multiple access (SC-FDMA) symbol of the subframe. UE in the time domain transmit SRS configuration with four parameters relating to: a cell-specific (cell-specific) period ^(T SFC) and subframe offset ^(Δ ^), and UE-specific (UE-specific) period _(s) and the sub- Frame offset ( ). Tables 5 and 6 show the cell-specific period and subframe offset in the Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems, respectively. The cell-specific period and subframe offset give the time domain subframe position in which all UEs in the cell may transmit SRS, while in other subframes, the use of the last SC-FDMA symbol is independent of the transmission of the SRS. Take srsSubframeConfiguration=7 in Table 5 as an example, 7^ = 5 , Δ^ = {0,1}, as shown in Figure 5, where S represents the base station in which the SRS resource is configured in the subframe, then the cell-specific one in the cell The SRS transmission period is 5 subframes, and the subframe 0 and subframe 1 positions in each period will be used by the UE to transmit the SRS.

Table 5: FDD sounding reference signal subframe configuration

(FDD SRS subframe configuration)

Transmission

SRS Subframe Configuration Period

Binary offset A _SFC

Configuration T _SFC (subframes)

Binary

SRS subframe configuration period (number of subframes)

Subframe offset

0 0000 1 {0}

1 0001 2 {0}

2 0010 2 {1 }

3 0011 5 {0}

4 0100 5 {1 }

5 0101 5 {2}

6 0110 5 {3}

7 0111 5 {0,1 }

8 1000 5 {2,3}

9 1001 10 {0} 10 1010 10 {1 }

11 1011 10 {2}

12 1100 10 {3}

13 1101 10 {0,1,2,3,4,6,8}

14 1110 10 {0,1,2,3,4,5,6,8}

15 1111 reserved reserved Table 6: TDD sounding reference signal subframe configuration

(TDD SRS subframe configuration)

14 1110 reserved reserved

15 1111 reserved reserved

Tables 7 and 8 show the UE-specific SRS transmission period and subframe offset in the FDD and TDD systems, respectively. The UE-specific period and subframe offsets give the time domain period and subframe position at which a certain UE transmits the SRS. Taking S _SRS = 17 in Table 7, for example, as shown in Figure 6, where S represents SRS transmission in the subframe, the UE transmits an SRS every 20 ms, and its time domain position is in the first subframe within 20 ms. send.

Table 7: UE Specific SRS Periodicity T _SRS and Subframe Offset Configuration T _OFFSET ,

FDD

(FDD system UE-specific period and subframe offset)

Table 8: UE Specific SRS Periodicity T _SRS and Subframe Offset Configuration T.

TDD

(TDD system UE-specific period and subframe offset)

Long Term Evolution Advanced (LTE-Advanced X) is an evolved version of LTE. In addition to meeting or exceeding 3GPP TR 25.913: "Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) (Evolved Universal Terrestrial Radio Access and Evolved Universal Terrestrial Radio Access Network Requirements), in addition to all relevant requirements, also meet or exceed the advanced international mobile communications proposed by the International Telecommunication Union (ITU-R) (IMT-Advanced) requirements, wherein the requirements for backward compatibility with LTE mean: LTE terminals can work in LTE-Advanced networks; LTE-Advanced terminals can work in LTE networks.

In addition, LTE-Advanced should be able to operate in different spectrum configurations, including a wider spectrum configuration than LTE (such as 100 MHz continuous spectrum resources) to achieve higher performance and target peak rates. Since the LTE-Advanced network needs to be able to access LTE users, its operating frequency band needs to cover the current LTE frequency band, and there is no allocated 100 MHz spectrum bandwidth allocated in this frequency band. Therefore, a direct technology that LTE-Advanced needs to solve is to aggregate several Component carriers distributed in different frequency bands to form a 100MHz bandwidth that LTE-Advanced can use. That is, for the aggregated spectrum, it is divided into n component carriers, and the spectrum in each component carrier is continuous.

There are three main schemes for spectrum configuration, as shown in Figure 7. Among them, the grid part is the system bandwidth compatible with LTE, and the slash part is the system bandwidth of LTE-Advanced. Figure 7a shows the spectrum configuration scheme 1 . The LTE-Advanced spectrum configuration consists of a system bandwidth defined by one LTE-Advanced, and the bandwidth is greater than the system bandwidth defined by LTE. Figure 7b shows the spectrum configuration scheme 2, which means that the LTE-Advanced spectrum configuration consists of one LTE defined system bandwidth and multiple LTE-Advanced defined system bandwidths by carrier aggregation. FIG. 7c is a spectrum configuration scheme 3, which means that the LTE-Advanced spectrum configuration is composed of a plurality of LTE-defined system bandwidths, and the carrier aggregation may be a continuous spectrum aggregation or a discontinuous spectrum aggregation. The LTE UE can access the LTE-compatible frequency band, and the LTE-A UE can access the LTE-compatible frequency band and can also access the LTE-Advanced frequency band.

Considering the compatibility with LTE, each component carrier of LTE-Advanced needs to satisfy the capability of transmitting SRS in the uplink. The prior art does not solve the problem of how the UE transmits the SRS on multiple uplink component carriers when the carrier aggregation is used. Therefore, it is urgent to design an SRS transmission method capable of maintaining compatibility with the LTE UE and flexibly configuring the LTE-Advanced UE. . Summary of the invention The technical problem to be solved by the present invention is to provide a method for transmitting a measurement reference signal in the case of carrier aggregation, and to solve the problem of how the UE transmits SRS on multiple uplink component carriers when the carrier is aggregated, and can maintain compatibility with the LTE UE. .

In order to solve the above technical problem, the present invention provides a method for transmitting a measurement reference signal in the case of carrier aggregation, which is applied to an advanced long-term evolution system, including:

The base station configures one or more sets of measurement reference signal configuration parameters for the uplink component carrier that the user equipment needs to measure under carrier aggregation, and sends the configuration parameter to the user equipment;

The user equipment sends a measurement reference signal to the base station according to the received measurement reference signal configuration parameter.

The above transmission method also has the following characteristics:

In the step of configuring one or more sets of measurement reference signal configuration parameters for the uplink component carrier that the user equipment needs to measure under the carrier aggregation, the base station configures a set of measurement reference signal configuration parameters and/or for one uplink component carrier. The uplink component carriers are configured with one or more sets of measurement reference signal configuration parameters.

The above transmission method also has the following characteristics:

In the step of the base station transmitting the measurement reference signal configuration parameter to the user equipment, the base station sends one or more sets of measurement reference signal configuration parameters to the user on one or more downlink component carriers agreed with the user equipment. device.

The above transmission method also has the following characteristics:

The measurement reference signal configuration parameter is used to configure a measurement reference signal transmitted on an uplink component carrier, which includes one or a combination of the following:

a cell-specific measurement reference signal bandwidth configuration index on the uplink component carrier;

a measurement reference signal bandwidth index dedicated to the user equipment on the uplink component carrier;

a measurement reference signal bandwidth start position dedicated to the user equipment on the uplink component carrier; a cell-specific measurement reference signal period and a subframe offset on the uplink component carrier; and a user equipment-specific measurement reference signal period on the uplink component carrier And a subframe offset; a frequency comb on the uplink component carrier; a frequency hopping bandwidth configuration on the uplink component carrier;

A cyclic shift on the uplink component carrier.

The above transmission method also has the following characteristics:

In the step of the user equipment transmitting the measurement reference signal to the base station according to the received measurement reference signal configuration parameter, the user equipment determines to send the measurement reference on the uplink component carrier according to the measurement reference signal configuration parameter. A frequency domain transmission location and/or a time domain transmission location and/or a measurement reference signal bandwidth and/or a cyclic shift of the signal are transmitted to the base station.

The above transmission method also has the following characteristics:

In the step of transmitting the measurement reference signal to the base station, on one or more uplink component carriers, the user equipment sends the measurement reference only on the last one or the second last single carrier frequency division multiplexing symbol of the subframe. signal.

In order to solve the above technical problem, the present invention further provides a transmitting apparatus for measuring a reference signal in the case of carrier aggregation, which is applied to an advanced long term evolution system, including a base station and a user equipment.

The base station includes a connected configuration module and a sending module.

The configuration module is configured to: configure one or more sets of measurement reference signal configuration parameters for the uplink component carrier that the user equipment needs to measure under carrier aggregation;

The sending module is configured to: send the measurement reference signal configuration parameter configured by the configuration module to the user equipment;

The user equipment is configured to: send a measurement reference signal to the base station according to the received measurement reference signal configuration parameter.

The above transmitting device also has the following features:

The configuration module is configured to: configure a set of measurement reference signal configuration parameters for one uplink component carrier and/or configure one or more sets of configuration parameters for multiple uplink component carriers.

The above transmitting device also has the following features:

The sending module is configured to: send a set of measurement reference signal configuration parameters to the user equipment on one or more downlink component carriers that are determined by the user equipment.

Further, the above transmitting device may further have the following features: The measurement reference signal configuration parameters configured by the configuration module include one or a combination of the following:

a measurement reference signal bandwidth start position dedicated to the user equipment on the uplink component carrier; a cell-specific measurement reference signal period and a subframe offset on the uplink component carrier; and a user equipment-specific measurement reference signal period on the uplink component carrier And a subframe offset; a frequency comb on the uplink component carrier;

a frequency hopping bandwidth configuration on the uplink component carrier;

A cyclic shift on the uplink component carrier.

The above transmitting device also has the following features:

The user equipment is configured to: determine, according to the measurement reference signal configuration parameter, a frequency domain transmission location and/or a time domain transmission location and/or a measurement reference signal bandwidth for transmitting a measurement reference signal on the uplink component carrier and/or The cyclic shift transmits a measurement reference signal to the base station.

The above transmitting device also has the following features:

The user equipment is configured to: send the measurement reference signal to the base station only on the last one or the second last single carrier frequency division multiplexing symbol of the subframe.

The present invention can maintain the compatibility with the LTE UE, and can flexibly and independently configure the SRS on each uplink component carrier according to the requirement, so that the efficiency of the transmitted SRS is increased, that is, the LTE-Advanced UE can be optimized in the carrier aggregation technology. The performance of sending measurement signals. BRIEF abstract

1 is a schematic diagram of a tree structure of an SRS bandwidth configuration in an LTE system;

2 is a schematic diagram of SRS frequency comb transmission in an LTE system;

3 is an LTE system UE determines an initial bandwidth for transmitting an SRS according to the received upper layer signaling “ _R ^” Location

4 is an LTE system UE determines a frequency hopping bandwidth region of an SRS according to the received upper layer signaling b _hop ; FIG. 5 is a schematic diagram of a cell-specific SRS transmission period ( Τ ) and a subframe offset ( ) of the LTE system;

6 is a schematic diagram of a UE-specific SRS transmission period (r _SRS ) and a subframe offset (T _ffset ) of an LTE system;

7 is a schematic diagram of a carrier aggregation spectrum configuration of an LTE-Advanced system;

8 is a flowchart of a method according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of an apparatus according to an embodiment of the present invention. Preferred embodiment of the invention

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

As shown in FIG. 8, the method of the embodiment of the present invention includes the following steps:

Step 801: The base station configures one or more sets of SRS configuration parameters for the uplink component carriers that the UE needs to measure under carrier aggregation, and sends the parameters to the UE.

Specifically, the base station may configure one set of SRS configuration parameters for one uplink component carrier, or configure one or more sets of SRS configuration parameters for multiple uplink component carriers.

The SRS configuration parameter is used to configure an SRS sent on an uplink component carrier;

The SRS configuration parameters include (but are not limited to) one or more of the following:

a cell-specific SRS bandwidth allocation index on the uplink component carrier;

• a UE-specific SRS bandwidth index on the uplink component carrier;

• a UE-specific SRS bandwidth start position on the uplink component carrier;

• a cell-specific SRS period and a subframe offset on the uplink component carrier;

• UE-specific SRS period and subframe offset on the uplink component carrier;

* frequency comb on the uplink component carrier;

• Frequency hopping bandwidth configuration on the uplink component carrier b _hop • cyclic shift on the upstream component carrier.

Further explanation:

A cell-specific SRS period and a subframe offset on an uplink component carrier indicate a time domain subframe position at which all UEs in the cell may transmit SRS on the uplink component carrier;

The UE-specific SRS period and the subframe offset on one uplink component carrier give a time domain period and a subframe position at which the UE transmits the SRS on the uplink component carrier.

Each set of SRS configuration parameters is sent on a specific downlink component carrier. Specifically, the base station sends a set of SRS configuration parameters to the UE on one or more downlink component carriers agreed upon by the UE.

Step 802: The UE sends an SRS to the base station according to the received SRS configuration parameter. Specifically, the UE determines, according to the SRS configuration parameter, a frequency domain transmission location and/or a time domain transmission location and/or an SRS bandwidth and/or a cyclic shift for transmitting the SRS on the uplink component carrier, and sends an SRS to the Base station.

Specifically, the UE determines, according to the cell-specific SRS bandwidth configuration index on the uplink component carrier, the SRS bandwidth configuration used by the current uplink component carrier, according to the number of resource blocks corresponding to the uplink component carrier bandwidth and the cell-specific SRS bandwidth configuration index of the uplink component carrier that is notified by the base station;

The UE obtains the SRS bandwidth of the uplink component carrier according to the SRS bandwidth configuration of the uplink component carrier and the UE-specific SRS bandwidth index of the uplink component carrier that is specific to the UE;

Further, on one uplink component carrier, the UE transmits the SRS only on the last one or the second last SC-FDMA symbol of the subframe.

As shown in FIG. 9, the transmitting apparatus of the embodiment of the present invention includes a base station and a UE.

The configuration module is configured to configure one or more sets of SRS configuration parameters for uplink component carriers that need to be measured by the UE under carrier aggregation;

The sending module is configured to send the SRS configuration parameter configured by the configuration module to the UE; The UE is configured to send an SRS to the base station according to the received SRS configuration parameter. The configuration module is further configured to configure a set of SRS configuration parameters for one uplink component carrier and/or configure one or more sets of SRS configuration parameters for multiple uplink component carriers.

The SRS configuration parameter configured by the configuration module includes, but is not limited to, one or more of the following: a cell-specific SRS bandwidth configuration index on the uplink component carrier;

a UE-specific SRS bandwidth index on the uplink component carrier;

a UE-specific SRS bandwidth start position on the uplink component carrier;

a cell-specific SRS period and a subframe offset on the uplink component carrier;

a UE-specific SRS period and a subframe offset on the uplink component carrier;

a frequency comb on the uplink component carrier;

a frequency hopping bandwidth configuration on the uplink component carrier;

A cyclic shift on the uplink component carrier.

The sending module is further configured to send each set of SRS configuration parameters to the UE on one or more downlink component carriers that are agreed with the UE.

Determining, by the UE, the frequency domain transmission location and/or the time domain transmission location and/or the SRS bandwidth for transmitting the SRS on the uplink component carrier according to the SRS configuration parameter, and sending an SRS to the base station.

On an uplink component carrier, the UE is further configured to transmit the SRS to the base station only on the last or last second SC-FDMA symbol of the subframe.

The following is a detailed description of a specific application example:

In the LTE-Advanced system, the base station configures a set of SRS configuration parameters for each uplink component carrier participating in carrier aggregation, and a set of SRS configuration parameters corresponds to one downlink component carrier, and the base station sets the SRS configuration parameter in its corresponding downlink component. Transmitting to the UE on the carrier; the UE sends the SRS on the corresponding uplink component carrier according to the SRS configuration parameter.

The base station sets an uplink component carrier-specific SRS bandwidth configuration for each uplink component carrier, and the SRS configuration parameter includes one or more of the following: a cell-specific SRS bandwidth configuration index on the uplink component carrier; a UE-specific SRS bandwidth index on the uplink component carrier;

• a UE-specific SRS bandwidth start position on the uplink component carrier;

a UE-specific SRS period and a subframe offset on the uplink component carrier;

• a frequency comb on the uplink component carrier;

• a frequency hopping bandwidth configuration on the uplink component carrier;

• cyclic shift on the upstream component carrier.

In the LTE-Advanced system, the base station first allocates a carrier-specific SRS bandwidth allocation index c^„ for each UE in the cell to access each uplink component carrier, where w represents a component carrier index. For component carrier m, according to The current number of RBs corresponding to the component carrier bandwidth (N^) is selected from Tables 1 to 4, and then determined according to ^, „determining the SRS bandwidth of the uplink component carrier.

For a certain UE, the base station allocates a carrier-specific SRS bandwidth index (or an index of the layer) for each uplink component carrier that it camps on, representing the component carrier index. The index is formulated according to the carrier-specific SRS bandwidth of the component carrier, and the UE obtains the SRS bandwidth used by the UE on the carrier-specific SRS bandwidth index of the component carrier. For example, the current UE resides in the UE. For the uplink component carrier No. 1, the carrier-specific SRS bandwidth of the component carrier is configured to index c = l, and the number of uplink component carrier RBs is 50, and the SRS bandwidth of the uplink component carrier is configured as the second row in Table 2. If the carrier-specific SRS bandwidth index allocated by the current base station to the uplink component carrier of the UE is 1 for the UE, the SRS band of the uplink component carrier occupies 16 RBs, and the location of the SRS bandwidth of the UE is The range of the uplink component carrier SRS bandwidth (ie, the range of the maximum SRS bandwidth is 48 RBs).

From the frequency domain, the UE learns the SRS bandwidth of an uplink component carrier, and according to the SRS configuration parameter sent by the base station, the frequency domain initial position of the SRS transmitted by the uplink component carrier is obtained, and the SRS configuration sent by the base station is obtained. In the parameter, b/^ knows the frequency hopping bandwidth area in which the SRS is transmitted, and the UE transmits the SRS in a frequency hopping manner according to the tree structure in the frequency hopping bandwidth area. From the time domain, the UE only sends on the last or the second last SC-FDMA symbol of the subframe.

SRS;

The configuration in which the UE transmits the SRS in a certain uplink component carrier time domain is related to four parameters: a cell-specific SRS period ( ) and an SRS subframe offset ( ) on the uplink component carrier, and a UE-specific carrier SRS on the uplink component carrier. The transmission period (r _SR ) and the SRS subframe offset (T _{offset m} ). The cell-specific SRS period and SRS subframe offset on each carrier gives the time domain subframe position at which all UEs camping on the uplink component carrier may transmit SRS. In Table 5

For example, the cell-specific SRS transmission period of the uplink component carrier is 5 subframes, and the subframe 0 and subframe 1 locations in each period may be used by the UE to transmit the SRS. In each uplink component carrier, the UE-specific SRS transmission period 7^ and the SRS subframe offset parameter give the time domain period and the subframe position of the specific UE transmitting the SRS. Taking I _SRS = 17 in Table 7 as an example. Then, the UE transmits an SRS reference signal every 20 ms on this component carrier, and its time domain position is transmitted in the first subframe within 20 ms.

The present invention can ensure compatibility between the LTE-Advanced system and the LTE system, enabling the LTE UE to access the LTE-Advanced network and maintain flexibility in designing the LTE-Advanced UE.

It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

Industrial applicability

The present invention can maintain the compatibility with the LTE UE, and can flexibly and independently configure the SRS on each uplink component carrier according to the requirement, so that the efficiency of the transmitted SRS is increased, that is, the LTE-Advanced UE can be optimized in the carrier aggregation technology. The performance of sending measurement signals.

Claims

Claim

A method for transmitting a measurement reference signal in the case of carrier aggregation, which is applied to an advanced long term evolution system, including:

2. The transmitting method according to claim 1, wherein

3. The transmitting method according to claim 1, wherein

4. The transmitting method according to claim 1, wherein

a frequency hopping bandwidth configuration on the uplink component carrier; A cyclic shift on the uplink component carrier.

The transmitting method according to any one of claims 1 to 4, wherein

6. The transmitting method as claimed in claim 5, wherein

7. A transmitting apparatus for measuring a reference signal in the case of carrier aggregation, which is applied to an advanced long term evolution system, including a base station and a user equipment,

8. The transmitting device according to claim 7, wherein

9. The transmitting device according to claim 7, wherein

10. The transmitting device according to claim 7, wherein

The measurement reference signal configuration parameter configured by the configuration module includes one or more of the following groups Combined:

a frequency hopping bandwidth configuration on the uplink component carrier;

A cyclic shift on the uplink component carrier.

The transmitting device according to any one of claims 7 to 10, wherein

12. The transmitting device according to claim 11, wherein