WO2017020578A1

WO2017020578A1 - Srs instruction sending method, srs sending method and device

Info

Publication number: WO2017020578A1
Application number: PCT/CN2016/074202
Authority: WO
Inventors: 王瑜新; 鲁照华; 陈艺戬; 李儒岳
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-07-31
Filing date: 2016-02-22
Publication date: 2017-02-09
Also published as: CN106411375A; CN106411375B

Abstract

The present invention provides an SRS instruction sending method, SRS sending method and device, the SRS instruction sending method comprising: generating configuration information for instructing a terminal device to send an SRS on a downlink frequency band or a preset frequency band, the preset frequency band comprising a frequency band other than an occupied frequency band for uplink sending of the terminal device; and sending the configuration information to the terminal device. The present invention solves the problem of wastage of downlink pilot resource overheads and terminal feedback overheads in an FDD Massive MIMO system, decreasing downlink pilot resource overheads and the amount of terminal feedback.

Description

SRS indication transmission method, SRS transmission method and device

Technical field

The present invention relates to the field of communications, and in particular to an SRS indication transmission method, an SRS transmission method, and an apparatus.

Background technique

A radio frame in a Long Term Evolution (LTE) system includes a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode. Frame structure. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art. As shown in FIG. 1, a 10 millisecond (ms) radio frame is composed of twenty slots of length 0.5 ms and numbers 0-19. The slots 2i and 2i+1 constitute a subframe i having a length of 1 ms. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art. As shown in FIG. 2, a 10 ms radio frame is composed of two half frames having a length of 5 ms, and one field includes five lengths of 1 ms. In the subframe, the subframe i is defined as two slots 2i and 2i+1 having a length of 0.5 ms.

In the above two frame structures, for a standard Cyclic Prefix (Normal CP), one slot contains seven symbols with a length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21us, the CP length of the remaining 6 symbols is 4.69us; for the Extended Cyclic Prefix (Extended Cyclic Prefix), one slot contains 6 symbols, and the CP length of all symbols is 16.67us. The time unit T _{s is} defined as T _s =1/(15000×2048) seconds, and the supported uplink and downlink configurations are as shown in Table 1.

Table 1 Up Link (UL)/Down Link (DL) Configuration

As shown in Table 1, for each subframe in a radio frame, "D" indicates a subframe dedicated to downlink transmission, "U" indicates a subframe dedicated for uplink transmission, and "S" indicates a special subframe, including: It is used in the three domains of the Downlink Pilot Time Slot (DwPTS), the Guard Period (GP), and the Uplink Pilot Time Slot (UpPTS). The lengths of DwPTS and UpPTS are shown in Table 2. The total length of DwPTS, GP and UpPTS is 30720·T _s =1ms. Each subframe i is represented by two time slots 2i and 2i+1, each of which has a length of T _slot = 15360 · T _s = 0.5 ms.

Table 2 Special subframe configuration (DwPTS/GP/UpPTS length)

LTE TDD supports 5ms and 10ms uplink and downlink switching cycles. If the downlink to uplink transition point period is 5 ms, the special subframe will exist in two fields; if the downlink to uplink transition point period is 10 ms, the special subframe exists only in the first field. Subframe 0 and subframe 5 and DwPTS are always used for downlink transmission. The UpPTS and the subframe immediately following the special subframe are dedicated to the uplink transmission.

In LTE, a physical downlink control channel (PDCCH) is used to carry uplink and downlink scheduling information, and uplink power control information. Downlink Control Information (DCI) format is divided into

DCI format

0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, etc., and later evolved to LTE-A version 12 ( DCI formats 2B, 2C, and 2D have been added to LTE-A Release 12 to support a variety of different applications and transmission modes. A base station (e-Node-B, referred to as an eNB for short) may configure a terminal device (User Equipment, also referred to as a UE, also referred to as a user equipment) through downlink control information, or a terminal device may receive a higher layer configuration, also called a The UE is configured through higher layer signaling.

The Sounding Reference Signal (SRS) is a signal used by a terminal device and a base station to measure channel state information (CSI). In the LTE system, the UE periodically transmits the uplink SRS on the last data symbol of the transmission subframe according to parameters such as the frequency band indicated by the eNB, the frequency domain location, the sequence cyclic shift, the period, and the subframe offset. The eNB determines the uplink CSI of the UE according to the received SRS, and performs operations such as frequency domain selection scheduling, closed loop power control, and the like according to the obtained CSI.

In the related LTE-A Release 10 study, it is proposed that in uplink communication, non-precoded SRS should be used, namely: antenna-specific SRS, and PUSCH for demodulation. The reference signal (De Modulation Reference Signal, DMRS for short) is precoded. The base station can estimate the original CSI of the uplink by receiving the non-precoded SRS, and the pre-coded DMRS cannot enable the base station to estimate the original CSI of the uplink. At this time, when the UE transmits the non-precoded SRS using multiple antennas, the SRS resources required by each UE increase, This has resulted in a decrease in the number of UEs that can be simultaneously multiplexed in the system. The UE may send the SRS by using the high-level signaling (also referred to as triggered by the trigger type 0) or the downlink control information (also referred to as triggering by the trigger type 1), and the periodic SRS is triggered based on the high-level signaling, and is based on the downlink control. The information is triggered by a non-periodic SRS. In the LTE-A Release 10, the manner of aperiodic transmission of SRS is added, which improves the utilization of SRS resources to some extent and improves the flexibility of resource scheduling.

The inventors of the present invention found in the research process that in the LTE-A Release 13 study, a full-dimension MIMO (Full Dimension-MIMO, abbreviated as FD-MIMO) or a large number of antennas MIMO (Massive) -MIMO) system In order to reduce the resource overhead of downlink pilots and reduce the feedback amount of UEs, TDD system base stations often obtain downlink CSI by measuring channel reciprocity by measuring SRS, but for FDD systems, due to uplink and downlink The difference in frequency band, the base station side will become very unreliable by measuring the reciprocity of the SRS using the channel reciprocity. The base station side can only send a large number of downlink pilots for a large number of antennas by conventional methods in order to obtain downlink CSI. The UE side measures the downlink pilot, and then feeds back the channel quality information (CQI, Channel Quality Information) and the Precoding Matrix Index (PMI) to the base station, so this conventional practice will inevitably waste a lot of Downlink pilot resource overhead and increase the feedback amount of the UE.

For the problem that the downlink pilot resource overhead and the terminal feedback overhead are wasted in the FDD system of the related technology Massive MIMO, an effective solution has not been proposed yet.

Summary of the invention

The present invention provides an SRS indication transmission method, an SRS transmission method, and an apparatus, to solve at least the problem of downlink pilot resource overhead and terminal feedback overhead waste in a Massive MIMO FDD system.

According to another aspect of the present invention, a method for transmitting an indication of an SRS is provided, including: generating configuration information for instructing a terminal device to send an SRS on a downlink frequency band or a preset frequency band, where the preset frequency band includes : a frequency band other than the frequency band occupied by the uplink transmission used by the terminal device; and transmitting the configuration information to the terminal device.

Optionally, before the generating the configuration information, the method further includes: receiving capability information of the terminal device from an uplink frequency band, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band. .

Optionally, the configuration information includes at least one of the following: configuration information of the uplink and downlink, configuration information of the subframe group, and a transmission parameter of the SRS configured in the downlink frequency band or configured in the downlink control signaling.

Optionally, the sending parameter of the SRS configured on the downlink frequency band includes: a sending period of the SRS configured on the downlink frequency band; and the sending parameter configured in the downlink control signaling includes: configuring the downlink control signal The request field of the SRS in the order, or the information used to indicate the SRS transmission in the downlink control signaling.

Optionally, the foregoing sending period of the SRS configured on the downlink frequency band is used to instruct the terminal device to send the SRS in a subframe that is in the sending period.

Optionally, the foregoing sending period includes one of the following: 2 milliseconds, 5 milliseconds, and 10 milliseconds.

Optionally, in the case that the sending period is 2 milliseconds or 5 milliseconds, the sending period is used to instruct the terminal device to send the SRS in an uplink pilot time slot of a special subframe, where each of the downlink frequency bands is used. The radio frame includes two special subframes; and/or in the case that the foregoing transmission period is 10 milliseconds, the foregoing transmission period is used to instruct the terminal device to send the SRS in an uplink pilot time slot of a special subframe, where the foregoing One special subframe is included in each radio frame on the downlink frequency band.

Optionally, the foregoing sending parameter of the SRS configured on the downlink frequency band includes at least one of: cyclic shift information, frequency domain location information, user-specific bandwidth, frequency comb location information, and SRS bandwidth configuration information.

Optionally, in the case that the value of the request field of the SRS configured in the downlink control signaling is a preset value, the request field is used to: indicate that the current communication system of the terminal device is frequency division duplex In the case of the FDD system, the terminal device transmits the SRS on the downlink frequency band; and/or indicates that when the current communication system of the terminal device is a time division duplex TDD system, the terminal device transmits the SRS on the uplink frequency band. .

Optionally, the downlink control signaling includes one of the following: DCI format 2B, DCI format 2C, DCI format 2D, DCI format 2E, and DCI format 2F.

Optionally, the radio frame structure of the uplink and downlink configuration indication includes one or two special subframes, where the next subframe of the special subframe is a downlink subframe.

Optionally, the special subframe is located at one or two of the following subframe numbers: subframe number 0, subframe number 1, subframe number 2, subframe number 5, subframe number 6, subframe No. 9.

Optionally, the configuration information of the subframe group includes at least one of the following: a first subframe group indicating that the SRS is sent in the downlink frequency band, and a second subframe group indicating that the SRS is sent in an uplink frequency band.

Optionally, the first subframe group is configured to: when the subframe where the downlink control signaling sent by the SRS is triggered is in the first subframe group, send the downlink control signaling triggered in the downlink frequency band. The foregoing SRS; the second subframe group is configured to: when the subframe in which the downlink control signaling that triggers the SRS transmission is located in the second subframe group, send the foregoing downlink control signaling triggered in the uplink frequency band SRS.

According to another aspect of the present invention, a method for transmitting an SRS is provided, including: receiving, by a terminal device, configuration information for instructing a terminal device to send an SRS in a downlink frequency band or a preset frequency band, where the preset frequency band is And including: a frequency band other than a frequency band occupied by the uplink transmission used by the terminal device; and sending the SRS on the downlink frequency band or the preset frequency band according to the configuration information.

Optionally, before the foregoing terminal device receives the configuration information, the method further includes: the terminal device transmitting the capability information of the terminal device to the sender of the configuration information, where the capability information is used to indicate whether the terminal device has The ability to transmit the above SRS on the downlink frequency band described above.

Optionally, when the configuration information includes the SRS transmission period configured on the downlink frequency band, sending the SRS on the downlink frequency band or the preset frequency band according to the configuration information includes: the terminal device is in the foregoing The above SRS is transmitted on the subframe of the transmission period.

Optionally, when the configuration information includes the SRS transmission period configured on the downlink frequency band, sending the SRS on the downlink frequency band or the preset frequency band according to the configuration information includes: In the case of milliseconds or 5 milliseconds, the terminal device transmits the SRS in an uplink pilot time slot of a special subframe, where each radio frame on the downlink frequency band includes two special subframes; and/or in the foregoing transmission When the period is 10 milliseconds, the terminal device transmits the SRS in an uplink pilot time slot of a special subframe, where each radio frame on the downlink frequency band includes one special subframe.

Optionally, when the configuration information includes the request domain of the SRS configured in the downlink control signaling, and the value of the request domain is a preset value, according to the configuration information, in the downlink frequency band or the foregoing Transmitting the foregoing SRS on the preset frequency band includes: when the current communication system of the terminal device is a frequency division duplex FDD system, the terminal device sends the SRS on the downlink frequency band; and/or current communication at the terminal device When the system is a time division duplex TDD system, the terminal device transmits the SRS on the uplink frequency band.

Optionally, in the case that the configuration information includes the configuration information of the foregoing subframe group, sending the SRS on the downlink frequency band or the preset frequency band according to the foregoing configuration information includes: the downlink control signaling that is triggered when the SRS is triggered to be sent. When the subframe in which the subframe is located in the first subframe group, the terminal device sends the SRS triggered by the downlink control signaling in the downlink frequency band, and the subframe in which the downlink control signaling sent by the SRS is triggered is in the second subframe. In the frame group, the terminal device transmits the SRS triggered by the downlink control signaling in the uplink frequency band.

According to another aspect of the present invention, an apparatus for instructing an SRS is further provided, including: a generating module, configured to generate configuration information for instructing a terminal device to send an SRS in a downlink frequency band or a preset frequency band, where The preset frequency band includes: a frequency band other than a frequency band occupied by the uplink transmission used by the terminal device; and a sending module configured to send the configuration information to the terminal device.

Optionally, the apparatus further includes: a receiving module, configured to receive capability information of the terminal device from an uplink frequency band, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.

According to another aspect of the present invention, a device for transmitting an SRS is provided, which is applied to a terminal device, and includes: a receiving module, configured to receive a configuration for instructing a terminal device to send an SRS in a downlink frequency band or a preset frequency band. The information, wherein the preset frequency band includes: a frequency band other than a frequency band occupied by the uplink transmission used by the terminal device; and the first sending module is configured to be in the downlink frequency band or the preset frequency band according to the configuration information. The above SRS is sent on.

Optionally, the device further includes: a second sending module, configured to send the capability information of the terminal device to the sender of the configuration information, where the capability information is used to indicate whether the terminal device is configured to send on the downlink frequency band The ability of the above SRS.

According to another aspect of the embodiments of the present invention, there is also provided a base station, comprising: the indication transmitting device of the foregoing measurement reference signal SRS.

According to another aspect of the embodiments of the present invention, there is also provided a terminal device, comprising: the foregoing sending device for measuring a reference signal SRS.

According to the embodiment of the present invention, configuration information is generated for instructing the terminal device to send the SRS in the downlink frequency band or the preset frequency band, where the preset frequency band includes: except for the frequency band occupied by the uplink transmission for the terminal device. The method of transmitting the configuration information to the terminal device solves the problem that the downlink pilot resource overhead and the terminal feedback overhead are wasted in the FDD system of the Massive MIMO, and reduces the resource overhead of the downlink pilot and the feedback amount of the terminal.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a frame structure of an FDD mode according to the related art;

2 is a schematic diagram of a frame structure of a TDD mode according to the related art;

FIG. 3 is a flowchart of a method for transmitting an indication of an SRS according to an embodiment of the present invention; FIG.

4 is a flowchart of a method for transmitting an SRS according to an embodiment of the present invention;

FIG. 5 is a structural block diagram of an indication transmitting apparatus of an SRS according to an embodiment of the present invention; FIG.

6 is a block diagram 1 of a preferred structure of an indication transmitting apparatus of an SRS according to an embodiment of the present invention;

FIG. 7 is a structural block diagram of a transmitting apparatus of an SRS according to an embodiment of the present invention; FIG.

FIG. 8 is a block diagram 1 showing a preferred structure of an apparatus for transmitting an SRS according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In this embodiment, a method for sending an indication of an SRS is provided. FIG. 3 is a flowchart of a method for sending an indication of an SRS according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step S302, generating configuration information for instructing the terminal device to send the SRS in the downlink frequency band or the preset frequency band, where the preset frequency band includes: other frequency bands than the frequency band occupied by the uplink transmission for the terminal device;

Step S304, sending configuration information to the terminal device.

Through the above steps, by sending configuration information for instructing the terminal device to send the SRS in the downlink frequency band or the preset frequency band, the terminal device may be in the downlink frequency band or the preset frequency band according to the configuration information (for example, the uplink pilot channel). Slots) Send SRS information. The problem that the downlink pilot resource overhead and the terminal feedback overhead are wasted in the FDD system of the Massive MIMO is solved, and the resource overhead of the downlink pilot and the feedback amount of the terminal are reduced.

Optionally, the above steps may be implemented by a base station device. Specifically, the above method can be implemented by a processing module on a base station or connected to a base station. In the embodiment, a base station will be described and illustrated as an example.

The preset frequency band includes a downlink frequency band or a frequency band for uplink transmission on a special subframe.

Optionally, before the step S302, the base station may further receive the capability information of the terminal device that is sent by the terminal device by using the uplink frequency band, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS or the uplink data on the downlink frequency band. After receiving the capability information of the terminal device, the base station determines whether to send the configuration information to the user equipment according to the capability of the terminal device. For example, in a case where the terminal device does not have the capability of transmitting the SRS on the downlink frequency band, the terminal device may be instructed to transmit the SRS on the uplink frequency band in a conventional manner, or may be preset in the uplink pilot time slot by using the configuration information knowledge terminal device. The SRS is transmitted on the frequency band.

Optionally, the configuration information includes, but is not limited to, at least one of the following: configuration information of the uplink and downlink, configuration information of the subframe group, and a transmission parameter of the SRS configured in the downlink frequency band or configured in the downlink control signaling. The other configuration information is also conceivable as long as it can be used to indicate that the terminal device transmits the SRS in the downlink frequency band or the preset frequency band. Therefore, in the embodiment of the present invention, the three configuration information is not limited.

Optionally, the sending parameter of the SRS configured in the downlink frequency band may be a sending period of the SRS configured in the downlink frequency band, and is used to instruct the terminal device to send the SRS in the subframe that is in the sending period.

Optionally, the foregoing optional values of the sending period include: 2 milliseconds, 5 milliseconds, and 10 milliseconds. The value of the sending period has a certain relationship with the frame structure. For example, in the case that the sending period is 2 milliseconds or 5 milliseconds, the sending period is used to instruct the terminal device to send the SRS in the uplink pilot time slot of the special subframe. Each of the radio frames in the frequency band includes two special subframes. For example, in a case where the transmission period is 10 milliseconds, the transmission period is used to instruct the terminal device to transmit the SRS in the uplink pilot time slot of the special subframe, where One special subframe is included in each radio frame on the downlink frequency band.

Optionally, the parameters of the SRS include one or more of the following information: cyclic shift information, frequency domain location, user-specific bandwidth, location of the frequency comb, SRS bandwidth configuration information.

Optionally, the sending parameter configured in the downlink control signaling may also be a request domain of the SRS configured in the downlink control signaling, or other information configured to indicate the SRS transmission configured in the downlink control signaling.

Optionally, in a case that the value of the request field of the SRS configured in the downlink control signaling is a preset value, the request domain is used to: indicate that the current communication system of the terminal device is a frequency division duplex FDD system. The terminal device transmits the SRS on the downlink frequency band; and/or indicates that in the case that the current communication system of the terminal device is a time division duplex TDD system, the terminal device transmits the SRS on the uplink frequency band. The preset value is determined according to a preset setting. For example, if the request field is 0 or 1 (that is, the preset value is 0 or 1), it is indicated that the SRS is sent on the downlink frequency band; and then the current communication system is determined to be FDD. Or TDD, the SRS is sent according to the result of the judgment. The value of the SRS sent by the requesting domain on the downlink frequency band may be set to other values, which is merely exemplary for description in the embodiment of the present invention, and does not mean that the preset value is limited to the value in the exemplary description.

Optionally, the foregoing downlink control signaling includes one of the following: DCI format 2B, DCI format 2C, DCI format 2D, DCI format 2E, and DCI format 2F.

Optionally, the radio frame structure indicated by the uplink and downlink configuration information includes one or two special subframes, where the next subframe of the special subframe is a downlink subframe. The uplink and downlink configuration information is used to instruct the terminal to send the SRS in a special subframe of the radio frame structure that it indicates.

Optionally, the optional location of the special subframe may be: the subframe number is 0 or the subframe number is 1 or the subframe number is 2 or the subframe number is 5 or the subframe number is 6 or the subframe number. On a sub-frame of 9.

Optionally, the configuration information of the subframe group includes at least one of: a first subframe group indicating that the SRS is transmitted in the downlink frequency band; and a second subframe group indicating that the SRS is transmitted in the uplink frequency band. In some preferred embodiments, only the first subframe group may be included; in other embodiments, the configuration information includes configuration information of the first subframe group and the second subframe group.

Optionally, the first subframe group is configured to: when the subframe in which the downlink control signaling that triggers the SRS transmission is located in the first subframe group, send the SRS triggered by the downlink control signaling in the downlink frequency band; The frame group is used to indicate that when the subframe in which the downlink control signaling that triggers the SRS transmission is located is in the second subframe group, the SRS triggered by the downlink control signaling is sent in the uplink frequency band.

In this embodiment, a method for sending an SRS is provided. FIG. 4 is a flowchart of a method for sending an SRS according to an embodiment of the present invention. As shown in FIG. 4, the process includes the following steps:

Step S402, the terminal device receives configuration information for instructing the terminal device to send an SRS in a downlink frequency band or a preset frequency band, where the preset frequency band includes: a frequency band other than a frequency band occupied by uplink transmission for the terminal device;

Step S404, sending an SRS on the downlink frequency band or the preset frequency band according to the configuration information.

Optionally, before the step S402, the terminal device sends the capability information of the terminal device to the sender of the configuration information, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.

Optionally, the sending parameter of the SRS configured on the downlink frequency band includes: a sending period of the SRS configured in the downlink frequency band; the sending parameter configured in the downlink control signaling includes: a request for the SRS configured in the downlink control signaling A domain, or information configured in the downlink control signaling for indicating SRS transmission.

Optionally, in step S404, in a case where the configuration information includes a transmission period of the SRS configured on the downlink frequency band, the terminal device transmits the SRS on the subframe that is in the transmission period.

Optionally, in the case that the configuration information includes a transmission period of the SRS configured on the downlink frequency band, sending the SRS on the downlink frequency band or the preset frequency band according to the configuration information includes: when the transmission period is 2 milliseconds or 5 milliseconds The terminal device sends the SRS in the uplink pilot time slot of the special subframe, where each radio frame on the downlink frequency band includes two special subframes; and/or in the case that the transmission period is 10 milliseconds, the terminal device is The uplink pilot slot of the special subframe transmits an SRS, where each radio frame on the downlink frequency band includes one special subframe.

Optionally, the sending parameter of the SRS configured on the downlink frequency band includes at least one of the following: cyclic shift information, frequency domain location information, user-specific bandwidth, frequency comb location information, and SRS bandwidth configuration information.

Optionally, in the step S404, in the case that the configuration information includes the request domain of the SRS configured in the downlink control signaling, and the value of the request domain is a preset value, the current communication system of the terminal device is a frequency division. In the case of a duplex FDD system, the terminal device transmits the SRS on the downlink frequency band; and/or in the case where the current communication system of the terminal device is a time division duplex TDD system, the terminal device transmits the SRS on the uplink frequency band.

Optionally, the downlink control signaling may be one of the following: DCI format 2B, DCI format 2C, DCI format 2D, DCI format 2E, and DCI format 2F.

Optionally, the radio frame structure information indicated by the uplink and downlink configuration information includes: one or two special subframes, where the next subframe of the special subframe is a downlink subframe.

Optionally, the location of the special subframe is located on a subframe with a subframe number of 0 or a subframe number of 1 or a subframe number of 2 or a subframe number of 5 or a subframe number of 6 or a subframe number of 9. .

Optionally, the configuration information of the subframe group includes at least one of: a first subframe group indicating that the SRS is transmitted in the downlink frequency band; and a second subframe group indicating that the SRS is transmitted in the uplink frequency band.

Optionally, in the case that the configuration information includes configuration information of the subframe group, according to the configuration information, in the downlink frequency band or The sending of the SRS on the preset frequency band includes: when the subframe in which the downlink control signaling sent by the SRS is triggered is in the first subframe group, the terminal device sends the SRS triggered by the downlink control signaling in the downlink frequency band; and the downlink control triggered by the SRS transmission When the subframe in which the signaling is located is in the second subframe group, the terminal device sends the SRS triggered by the downlink control signaling in the uplink frequency band.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention in essence or the contribution to the related art can be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM). The instructions include a number of instructions for causing a terminal device (which may be a cell phone, computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

In the embodiment, an SRS indication sending device is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 5 is a structural block diagram of an SRS indication transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 5, the apparatus includes: a generating module 52 and a sending module 54, wherein the generating module 52 is configured to generate a terminal device for generating The configuration information of the SRS is sent on the downlink frequency band or the preset frequency band, where the preset frequency band includes: other frequency bands than the frequency band occupied by the uplink transmission for the terminal device; the first sending module 54 is coupled to the generating module 52. , set to send configuration information to the terminal device.

FIG. 6 is a block diagram of a preferred structure of an SRS indication transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 6, the apparatus further includes: a receiving module 62 coupled to the generating module 52, configured to be from an uplink frequency band. The capability information of the terminal device is received, wherein the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.

Optionally, the sending period of the SRS configured on the downlink frequency band is used to indicate that the terminal device sends the SRS on the subframe that is in the sending period.

Optionally, the sending period includes one of the following: 2 milliseconds, 5 milliseconds, 10 milliseconds.

Optionally, in the case that the sending period is 2 milliseconds or 5 milliseconds, the sending period is used to indicate that the terminal device sends the SRS in the uplink pilot time slot of the special subframe, where each radio frame on the downlink frequency band includes 2 a special subframe; and/or in the case that the transmission period is 10 milliseconds, the transmission period is used to instruct the terminal device to transmit the SRS in the uplink pilot time slot of the special subframe, where each radio frame on the downlink frequency band is included 1 special subframe.

Optionally, in a case that the value of the request field of the SRS configured in the downlink control signaling is a preset value, the request domain is used to: indicate that the current communication system of the terminal device is a frequency division duplex FDD system. The terminal device transmits the SRS on the downlink frequency band; and/or indicates that in the case that the current communication system of the terminal device is a time division duplex TDD system, the terminal device transmits the SRS on the uplink frequency band.

Optionally, the radio frame structure indicated by the uplink and downlink configuration includes one or two special subframes, where the next subframe of the special subframe is a downlink subframe.

Optionally, the special subframe is located at one or two of the following subframe numbers: subframe number 0, subframe number 1, subframe number 2, subframe number 5, subframe number 6, and subframe number. 9.

In this embodiment, a SRS transmitting apparatus is further provided. FIG. 7 is a structural block diagram of an SRS sending apparatus according to an embodiment of the present invention. As shown in FIG. 7, the apparatus is applied to a terminal apparatus, and the apparatus includes: receiving The module 72 and the first sending module 74, wherein the receiving module 72 is configured to receive configuration information for instructing the terminal device to send the SRS on the downlink frequency band or the preset frequency band, where the preset frequency band includes: except for the terminal device The uplink transmitting the other frequency bands except the occupied frequency band; the first sending module 74 is coupled to the receiving module 72, and configured to send the SRS in the downlink frequency band or the preset frequency band according to the configuration information.

FIG. 8 is a block diagram of a preferred structure of an apparatus for transmitting an SRS according to an embodiment of the present invention. As shown in FIG. 8, the apparatus further includes: a second sending module 82 coupled to the first receiving module 72, configured to Transmitting the capability information of the terminal device to the sender of the configuration information, wherein the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.

Optionally, the first sending module 74 is configured to send the SRS in a subframe that is in a sending period if the configuration information includes a sending period of the SRS configured on the downlink frequency band.

Optionally, the first sending module 74 is configured to: when the configuration information includes a sending period of the SRS configured on the downlink frequency band: in a case where the sending period is 2 milliseconds or 5 milliseconds, the uplink of the special subframe The frequency slot transmits the SRS, where each radio frame on the downlink frequency band includes two special subframes; and/or, in the case that the transmission period is 10 milliseconds, the SRS is transmitted in the uplink pilot time slot of the special subframe. Wherein, each radio frame on the downlink frequency band includes one special subframe.

Optionally, the first sending module 74 is configured to: when the configuration information includes the request domain of the SRS configured in the downlink control signaling, and the value of the request domain is a preset value: the current communication system of the terminal device In the case of a frequency division duplex FDD system, the SRS is transmitted on the downlink frequency band; and/or in the case where the current communication system of the terminal device is a time division duplex TDD system, the SRS is transmitted on the uplink frequency band.

Optionally, the first sending module 74 is configured to: when the configuration information includes the configuration information of the subframe group: when the subframe in which the downlink control signaling that triggers the SRS transmission is located in the first subframe group, in the downlink frequency band Sending the SRS triggered by the downlink control signaling; when the subframe in which the downlink control signaling sent by the SRS is triggered is in the second subframe group, the SRS triggered by the downlink control signaling is sent in the uplink frequency band.

In this embodiment, a base station is further provided, including: the indication sending device of the foregoing SRS.

In this embodiment, a terminal device is further provided, comprising: the foregoing sending device for measuring the reference signal SRS.

In the embodiment, a SRS transmission system is further provided, and the system includes: the SRS indication transmitting device and the SRS transmitting device.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple At In the processor.

Embodiments of the present invention also provide a software for performing the technical solutions described in the above embodiments and preferred embodiments.

Embodiments of the present invention also provide a storage medium. In this embodiment, the above storage medium may be configured to store program code for performing the following steps:

S200, generating configuration information for instructing the terminal device to send an SRS in a downlink frequency band or a preset frequency band, where the preset frequency band includes: a frequency band other than a frequency band occupied by uplink transmission for the terminal device;

S400: Send configuration information to the terminal device.

S600, the terminal device receives configuration information for instructing the terminal device to send an SRS in a downlink frequency band or a preset frequency band, where the preset frequency band includes: a frequency band other than a frequency band occupied by uplink transmission for the terminal device;

S800: Send an SRS in a downlink frequency band or a preset frequency band according to the configuration information.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

In order to make the description of the embodiments of the present invention more clear, the following description and description are given in conjunction with the preferred embodiments.

Preferred embodiment 1

In the preferred embodiment, the base station sends configuration information of the SRS to the user terminal, where the configuration information includes: information for indicating that the terminal device sends the SRS on the downlink frequency band, where the terminal device is configured to instruct the terminal device to send the SRS on the downlink frequency band. Information, including: an SRS transmission period configured on a downlink frequency band;

The base station configures the SRS transmission period on the downlink frequency band for the terminal device by using the high layer RRC signaling. When the terminal device is in the subframe of the downlink frequency band SRS transmission period, the terminal device sends the SRS on the subframe; for example, the subframe index When the following formula is satisfied, the SRS is transmitted on the subframe.

(10·n _f +k _SRS -T _offset )modT _SRS =0

Where n _f is the system frame number, k _SRS is the subframe index, T _offset is the SRS subframe offset, T _SRS is the SRS period, and T _SRS is greater than or equal to 2 milliseconds;

When T _SRS >2, the value of k _SRS is as shown in Table 3 or Table 4 or Table 5;

When T _SRS = 2, the value of the subframe index k _SRS needs to satisfy (k _{SRS -} T _offset ) mod5 = 0.

Table 3 Sub-frame index table 1 when the SRS period is greater than 2

Table 4 Sub-frame index table 2 when the SRS period is greater than 2

Table 5 Sub-frame index table 3 when the SRS period is greater than 2

Optionally, the SRS transmission period may be 2 milliseconds or 5 milliseconds or 10 milliseconds;

Preferred embodiment two

Optionally, before setting the configuration information of the SRS, the base station receives the capability information of the terminal device that is sent by the terminal device, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS or the uplink data on the downlink frequency band.

When the terminal device is configured to transmit the uplink SRS in the downlink frequency band and the base station has the capability of performing uplink reception in the downlink frequency band, the base station may configure the SRS transmission period on the downlink frequency band to the terminal device, and at the same time, the frame structure on the downlink frequency band is correspondingly Adjusted to include the frame structure of a special sub-frame.

When the SRS transmission period is 2 milliseconds or 5 milliseconds, it indicates that each radio frame on the downlink frequency band includes two special subframes, and the terminal device transmits the SRS in the uplink pilot time slot of the special subframe; when the SRS transmission period is At 10 milliseconds, it indicates that each radio frame on the downlink frequency band includes one special subframe, and the terminal device transmits the SRS in the uplink pilot time slot of the special subframe.

Preferred embodiment three

The transmission method of the measurement reference signal provided in the preferred embodiment is implemented by a system including a base station and a user terminal (corresponding to the above-mentioned terminal device). The base station sets the configuration information of the SRS, and sends the configuration information of the SRS to the terminal device. The configuration information includes: information used to indicate that the terminal device sends the SRS in the downlink frequency band;

Optionally, the information for indicating that the terminal device sends the SRS on the downlink frequency band includes: an SRS request field in the downlink control signaling, and information used to indicate the SRS transmission in the downlink control signaling;

Optionally, the SRS request field in the downlink control signaling includes: when the SRS request field value in the downlink control signaling is valid, and the communication system between the base station and the terminal device is an FDD system, indicating that the terminal device is in the downlink frequency band When the SRS request field in the downlink control signaling is valid and the communication system between the base station and the terminal device is a TDD system, the indication is that the terminal device sends the SRS in the uplink frequency band; wherein, the SRS request field value is When 0 or 1, it means that the value is valid.

The information indicating the SRS transmission in the downlink control signaling includes: the downlink control signaling is related to the DCI format 2B or the DCI format 2C or the DCI format 2D in the LTE-A Release 12 or is added to the subsequent evolved version of the LTE-A. Information used to indicate SRS transmission in DCI format 2E or DCI format 2F;

The terminal device transmits the SRS according to the received SRS configuration information. Optionally, the information used to indicate the SRS transmission in the DCI format 2E or the DCI format 2F may be 2 bits, as shown in Table 6 or Table 7 or Table 8 for the meaning of the SRS request field.

Table 6 Meaning of the SRS request field

SRS请求域的取值The value of the SRS request field	描述description
’00’’00’	无SRS触发No SRS trigger
‘01’‘01’	触发SRS在上行频带发送Trigger SRS to send in the uplink frequency band
‘10’‘10’	触发SRS在下行频带发送Trigger SRS to send in the downlink frequency band
‘11’‘11’	预留Reserved

Table 7 Meaning of the SRS request field

SRS请求域的取值The value of the SRS request field	描述description
’00’’00’	无SRS触发No SRS trigger
‘01’‘01’	触发SRS在下行频带发送Trigger SRS to send in the downlink frequency band
‘10’‘10’	触发SRS在上行频带发送Trigger SRS to send in the uplink frequency band
‘11’‘11’	预留Reserved

Table 8 Meaning of the SRS request field

SRS请求域的取值The value of the SRS request field	描述description
’00’’00’	无SRS触发No SRS trigger
‘01’‘01’	触发SRS在上行频带发送Trigger SRS to send in the uplink frequency band
‘10’‘10’	触发SRS在下行频带发送Trigger SRS to send in the downlink frequency band
‘11’‘11’	触发SRS在下行和上行频带发送Trigger SRS to send in the downlink and uplink bands

It should be noted that the meaning of the above request domain is exemplified as an embodiment of the present invention, and does not indicate that the meaning of the SRS request domain is limited to the three modes exemplified above.

Preferred embodiment four

In the preferred embodiment, the base station sends configuration information of the SRS to the terminal device, where the configuration information includes: uplink and downlink configuration information;

Optionally, the uplink and downlink configuration information includes: one or two special subframes in the radio frame structure information of the uplink and downlink configuration indication, where the next subframe of the special subframe is a downlink subframe. ;

Optionally, the location of the special subframe is located on a subframe with a subframe number of 0 or a subframe number of 1 or a subframe number of 2 or a subframe number of 6 or a subframe number of 9.

Optionally, the number of downlink pilot time slots DwPTS included in the special subframe is N, where N is between 8 and 12. An integer, including 8 and 12;

The terminal device performs uplink and downlink subframe configuration according to the uplink and downlink configuration information configured by the base station, and sends the SRS on the special subframe.

Preferred embodiment five

In the preferred embodiment, the base station sends the configuration information of the SRS to the user terminal, where the configuration information includes: the terminal device feeds back the capability information of the terminal device to the base station, and the capability information includes whether the terminal device has the SRS or the uplink in the downlink frequency band. Ability of data;

The base station receives the capability information of the terminal device that is fed back through the uplink frequency band, and then determines whether the base station itself has the capability of performing uplink reception on the downlink frequency band. If the capability is available, the base station can send the configuration information of the SRS to the user terminal. Instructing the terminal device to transmit the SRS on the downlink frequency band.

Preferred embodiment six

In this embodiment, the base station sends configuration information of the SRS to the user terminal, where the configuration information includes: configuration information of the subframe group;

The configuration information of the subframe group includes a subframe group 1 and a subframe group 2, or a subframe set 1 and a subframe set 2;

When the subframe in which the DCI signaling sent by the SRS is triggered is in the subframe group 1 or the subframe set 1, it indicates that the triggered SRS is sent in the downlink frequency band; when the subframe in which the DCI signaling triggered by the SRS is triggered is in the subframe group 2 or subframe set 2 indicates that the triggered SRS is transmitted in the uplink frequency band.

Or, when the subframe in which the DCI signaling sent by the SRS is triggered is in the subframe group 2 or the subframe set 2, it indicates that the triggered SRS is sent in the downlink frequency band; when the subframe in which the DCI signaling triggered by the SRS is triggered is in the subframe When frame group 1 or subframe set 1 is set, it indicates that the triggered SRS is transmitted in the uplink frequency band.

In summary, by the above-described embodiments and preferred embodiments of the present invention, a transmission mode for measuring a reference signal has been added. Through the foregoing embodiment or the preferred embodiment, the present invention can implement that the terminal device sends the SRS in the downlink frequency band, solves the problem that the related FDD system utilizes the channel reciprocity, reduces the resource overhead of the downlink pilot, and reduces the resource overhead. The feedback amount of the UE, thereby more reliably utilizing the channel reciprocity to achieve better transmission performance of the FD-MIMO/Massive-MIM system, thereby achieving the effect of improving the overall performance of the system.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or make multiple modules or steps into a single The integrated circuit module is implemented. Thus, the invention is not limited to any specific combination of hardware and software.

The above description 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

In the embodiment of the present invention, configuration information is generated to indicate that the terminal device sends the SRS in the downlink frequency band or the preset frequency band, where the preset frequency band includes: except for the frequency band occupied by the uplink transmission for the terminal device. Other frequency bands; the method of transmitting the configuration information to the terminal device solves the problem that the downlink pilot resource overhead and the terminal feedback overhead are wasted in the FDD system of the Massive MIMO, and reduces the resource overhead of the downlink pilot and the feedback amount of the terminal.

Claims

An indication transmitting method for measuring a reference signal SRS, comprising:

Generating configuration information for instructing the terminal device to transmit the SRS on the downlink frequency band or the preset frequency band, where the preset frequency band includes: other frequency bands than the frequency band occupied by the uplink transmission for the terminal device;

Sending the configuration information to the terminal device.
The method of claim 1, wherein before the generating the configuration information, the method further comprises:

Receiving capability information of the terminal device from an uplink frequency band, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.
The method of claim 1, wherein the configuration information comprises at least one of the following:

The configuration information of the uplink and downlink, the configuration information of the subframe group, and the transmission parameters of the SRS arranged in the downlink frequency band or in the downlink control signaling.
The method of claim 3, wherein

The sending parameter of the SRS configured on the downlink frequency band includes: a sending period of an SRS configured on the downlink frequency band;

The sending parameter configured in the downlink control signaling includes: a request domain of an SRS configured in the downlink control signaling, or information used to indicate SRS transmission in the downlink control signaling.
The method according to claim 4, wherein the transmission period of the SRS configured on the downlink frequency band is used to instruct the terminal device to transmit the SRS on a subframe that is in the transmission period.
The method of claim 4 wherein said sending cycle comprises one of:

2 milliseconds, 5 milliseconds, 10 milliseconds.
The method of claim 6 wherein

In the case that the sending period is 2 milliseconds or 5 milliseconds, the sending period is used to instruct the terminal device to send the SRS in an uplink pilot time slot of a special subframe, where each of the downlink frequency bands 2 radio frames include 2 special subframes; and/or

In the case that the sending period is 10 milliseconds, the sending period is used to instruct the terminal device to send the SRS in an uplink pilot time slot of a special subframe, where each wireless frame on the downlink frequency band Includes 1 special subframe.
The method of claim 3, wherein the transmission parameter of the SRS configured on the downlink frequency band comprises at least one of: cyclic shift information, frequency domain location information, user-specific bandwidth, frequency comb Location information, SRS bandwidth configuration information.
The method of claim 3, wherein the request domain of the SRS configured in the downlink control signaling In the case where the value is a preset value, the request field is used to:

Instructing that, in a case where the current communication system of the terminal device is a frequency division duplex FDD system, the terminal device transmits the SRS on the downlink frequency band; and/or

Instructing that the current communication system of the terminal device is a time division duplex TDD system, the terminal device transmits the SRS on an uplink frequency band.
The method of claim 3, wherein the downlink control signaling comprises one of the following:

Downlink control information DCI format format 2B, DCI format 2C, DCI format 2D, DCI format 2E, DCI format 2F.
The method according to claim 3, wherein the radio frame structure indicated by the uplink and downlink configuration includes one or two special subframes, wherein a next subframe of the special subframe is a downlink subframe.
The method of claim 11 wherein said special subframe is located at one or both of the following subframe numbers:

Subframe number 0, subframe number 1, subframe number 2, subframe number 5, subframe number 6, and subframe number 9.
The method of claim 3, wherein the configuration information of the subframe group comprises at least one of the following:

Instructing to transmit the first subframe group of the SRS in the downlink frequency band;

Indicates to transmit a second subframe group of the SRS in an uplink frequency band.
The method of claim 13 wherein

The first subframe group is configured to: when the subframe where the downlink control signaling sent by the SRS is triggered is in the first subframe group, send the downlink control signaling trigger in the downlink frequency band Said SRS;

The second subframe group is configured to: when the subframe where the downlink control signaling sent by the SRS is triggered is in the second subframe group, send the downlink control signaling trigger in the uplink frequency band Said SRS.
A method for transmitting a measurement reference signal SRS, comprising:

The terminal device receives configuration information for instructing the terminal device to send an SRS on a downlink frequency band or a preset frequency band, where the preset frequency band includes: a frequency band other than a frequency band occupied by uplink transmission for the terminal device ;

And transmitting, according to the configuration information, the SRS on the downlink frequency band or the preset frequency band.
The method according to claim 15, wherein before the receiving, by the terminal device, the method, the method further comprises:

The terminal device sends the capability information of the terminal device to the sender of the configuration information, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.
The method of claim 15, wherein the configuration information comprises at least one of the following:

The configuration information of the uplink and downlink, the configuration information of the subframe group, and the transmission parameters of the SRS arranged in the downlink frequency band or in the downlink control signaling.
The method of claim 17, wherein

The sending parameter of the SRS configured on the downlink frequency band includes: a sending period of an SRS configured on the downlink frequency band;

The sending parameter configured in the downlink control signaling includes: a request domain of an SRS configured in the downlink control signaling, or information used to indicate SRS transmission in the downlink control signaling.
The method according to claim 18, wherein, in the case where the configuration information includes a transmission period of an SRS configured on the downlink frequency band, the downlink frequency band or the preset frequency band according to the configuration information Transmitting the SRS includes:

The terminal device transmits the SRS on a subframe that is in the sending period.
The method of claim 18, wherein the transmission period comprises one of:

2 milliseconds, 5 milliseconds, 10 milliseconds.
The method according to claim 20, wherein, in the case where the configuration information includes a transmission period of an SRS configured on the downlink frequency band, the downlink frequency band or the preset frequency band according to the configuration information Transmitting the SRS includes:

In the case that the sending period is 2 milliseconds or 5 milliseconds, the terminal device sends the SRS in an uplink pilot time slot of a special subframe, where each radio frame on the downlink frequency band includes two Special subframe; and/or

In the case that the sending period is 10 milliseconds, the terminal device sends the SRS in an uplink pilot time slot of a special subframe, where each radio frame on the downlink frequency band includes one special subframe. .
The method of claim 17, wherein the transmission parameter of the SRS configured on the downlink frequency band comprises at least one of: cyclic shift information, frequency domain location information, user-specific bandwidth, frequency comb Location information, SRS bandwidth configuration information.
The method according to claim 18, wherein, in the case that the configuration information includes the request domain of the SRS configured in the downlink control signaling, and the value of the request domain is a preset value, Transmitting the SRS on the downlink frequency band or the preset frequency band according to the configuration information includes:

In a case where the current communication system of the terminal device is a frequency division duplex FDD system, the terminal device transmits the SRS on the downlink frequency band; and/or

In a case where the current communication system of the terminal device is a time division duplex TDD system, the terminal device transmits the SRS on an uplink frequency band.
The method of claim 18, wherein the downlink control signaling comprises one of the following:

Downlink control information DCI format format 2B, DCI format 2C, DCI format 2D, DCI format 2E, DCI format 2F.
The method according to claim 18, wherein the radio frame structure indicated by the uplink and downlink configuration comprises one or two special subframes, wherein a next subframe of the special subframe is a downlink subframe.
The method of claim 25, wherein the special subframe is located at one or both of the following subframe numbers:

Subframe number 0, subframe number 1, subframe number 2, subframe number 5, subframe number 6, and subframe number 9.
The method of claim 17, wherein the configuration information of the subframe group comprises at least one of the following:

Instructing to transmit the first subframe group of the SRS in the downlink frequency band;

Indicates to transmit a second subframe group of the SRS in an uplink frequency band.
The method according to claim 27, wherein, in a case where the configuration information includes configuration information of the subframe group, the transmitting is performed on the downlink frequency band or the preset frequency band according to the configuration information. SRS includes:

When the subframe in which the downlink control signaling sent by the SRS is triggered is in the first subframe group, the terminal device sends the SRS triggered by the downlink control signaling in the downlink frequency band;

When the subframe in which the downlink control signaling that is triggered by the SRS is triggered is in the second subframe group, the terminal device sends the SRS triggered by the downlink control signaling in the uplink frequency band.
An indication transmitting device for measuring a reference signal SRS, comprising:

a generating module, configured to generate configuration information for instructing the terminal device to send an SRS on a downlink frequency band or a preset frequency band, where the preset frequency band includes: except for a frequency band occupied by uplink transmission for the terminal device Other frequency bands;

And a sending module, configured to send the configuration information to the terminal device.
The device of claim 29, wherein the device further comprises:

The receiving module is configured to receive capability information of the terminal device from an uplink frequency band, where the capability information is used to indicate whether the terminal device has the capability of transmitting the SRS on the downlink frequency band.
A transmitting device for measuring a reference signal SRS is applied to a terminal device, and includes:

a receiving module, configured to receive configuration information for instructing the terminal device to send an SRS on a downlink frequency band or a preset frequency band, where the preset frequency band includes: except for a frequency band occupied by uplink transmission for the terminal device Other frequency bands;

The first sending module is configured to send the downlink frequency band or the preset frequency band according to the configuration information. Send the SRS.
The device of claim 31, wherein the device further comprises:

a second sending module, configured to send the capability information of the terminal device to the sender of the configuration information, where the capability information is used to indicate whether the terminal device is configured to send the SRS on the downlink frequency band ability.
A base station comprising: the indication transmitting device of the measurement reference signal SRS according to claim 29 or claim 30.
A terminal device comprising: a transmitting device for measuring a reference signal SRS according to claim 31 or claim 32.