CN101917765B

CN101917765B - A kind of collocation method of measuring reference signals and system

Info

Publication number: CN101917765B
Application number: CN201010257095.7A
Authority: CN
Inventors: 戴博; 王瑜新; 喻斌; 梁春丽
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-08-13
Filing date: 2010-08-13
Publication date: 2015-09-16
Anticipated expiration: 2030-08-13
Also published as: CN101917765A; WO2012019412A1

Abstract

The invention discloses a kind of collocation method and system of measuring reference signals, realize the configuration of SRS aperiodic, can solve in prior art and cannot realize the problem that UE dynamic flexible sends SRS aperiodic.Described collocation method comprises: base station sends Downlink Control Information to user terminal, triggers described user terminal send SRS aperiodic by described Downlink Control Information, and the resource used when indicating described user terminal to send SRS aperiodic.

Description

Configuration method and system for measurement reference signal

Technical Field

The present invention relates to the field of communications, and in particular, to a method and a system for configuring a Sounding Reference Signal (SRS).

Background

Uplink Physical channels of a Long Term Evolution (LTE) system include a Physical Random Access Channel (PRACH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH). The PUSCH has two different Cyclic Prefix (CP) lengths, namely, a Normal Cyclic Prefix (Normal CP) and an Extended Cyclic Prefix (Extended CP). Each transmission Subframe (Subframe) of the PUSCH consists of two slots (slots), and for different cyclic prefix lengths, positions of Demodulation Reference signals (DMRSs) in the subframes may be different, and fig. 1 is a time domain position diagram of a Demodulation Reference Signal in the prior art. As shown in fig. 1, each subframe contains two DMRS symbols, where fig. 1a is a schematic diagram of a time-domain position of a DMRS when a normal cyclic prefix is used, each subframe contains 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols including the DMRS symbols, and each OFDM symbol represents a time-domain position of one subframe, and fig. 1b is a schematic diagram of a time-domain position of a DMRS when an extended cyclic prefix is used, and each subframe contains 12 time-domain data OFDM symbols.

In LTE, the physical downlink control channel PDCCH is used to carry uplink and downlink scheduling information, as well as uplink power control information. A base station (e-Node-B, abbreviated as eNB) may configure a User Equipment (User Equipment, abbreviated as UE) through downlink control information, or the User Equipment receives configuration of higher layers (highers), which is also called to configure the UE through higher layer signaling. Downlink Control Information (DCI) format (format) is divided into DCI formats 0, 1A, 1B, 1C, 1D, 2A, 3A, and the like. Wherein,

the DCI format0 is used to indicate scheduling of a Physical Uplink Shared Channel (PUSCH);

the DCI format 1, 1A, 1B, 1C, 1D is used for different transmission modes of a Physical Downlink Shared Channel (PDSCH) of a single transport block;

the DCI format 2, 2A is used for different transmission modes of downlink PDSCH space division multiplexing;

the DCI format 3, 3A is used for transmission of a Physical Uplink Control Channel (PUCCH) and a power control command of the PUSCH.

The transport block sizes of the DCI formats 0, 1A, 3, and 3A are the same, where 1 bit is used for format differentiation in the DCI formats 0 and 1A.

The DCI format for indicating the scheduling of the physical uplink shared channel includes a 5-bit modulation and coding scheme and redundancy version indication information, and the state represented by the 5 bits is shown in table 1.

Table 1 modulation, transport block size index and redundancy version table for PUSCH

(Modulation，TBS index and redundancy version table for PUSCH)

The DCI format for indicating the pdcch scheduling includes 5 bits of modulation and coding scheme indication information, and the state represented by the 5 bits is shown in table 2.

Table 2 Modulation and transport block size index table (Modulation and TBSindex table for PDSCH) for PDSCH

Broadcast Information of the LTE system is divided into MIB (main message block) transmitted on PBCH (physical broadcast channel) and SIB (system message block) transmitted on PDSCH (also called SI, Scheduled Information).

The SRS is a signal for measuring radio Channel information (CSI) between the ue and the bs. In a long term evolution system, a UE (user equipment) transmits an uplink SRS (sounding reference signal) on the last data symbol of a transmission subframe at regular time according to parameters such as bandwidth, frequency domain position, sequence cyclic shift, period and subframe offset indicated by an eNB (evolved node B). And the eNB judges 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 LTE system, the SRS sequence transmitted by the UE is a root sequenceAnd performing cyclic shift alpha in a time domain. Different SRS sequences can be obtained by performing different cyclic shifts alpha on the same root sequence, and the obtained SRS sequences are mutually orthogonal, so that the SRS sequences can be allocated to different UEs for use, and the code division multiple access between the UEs can be realized. In the LTE system, the SRS sequence defines 8 cyclic shifts α, which is given by the following formula (1):

… … formula (1)

Wherein,indicated by 3bit signaling, 0, 1, 2, 3, 4, 5, 6 and 7, respectively. That is, within a cell under the same time-frequency resourceThe UE has 8 available code resources, and the eNB can configure up to 8 UEs to transmit SRS simultaneously on the same time-frequency resource. Equation (1) can be regarded as dividing the SRS sequence into 8 parts at equal intervals in the time domain, but since the SRS sequence length is a multiple of 12, the minimum length of the SRS sequence is 24.

In the LTE system, the frequency domain bandwidth of the SRS is configured in a tree structure. Each SRS Bandwidth configuration (SRS Bandwidth configuration) corresponds to a tree structure, and an SRS Bandwidth (SRS-Bandwidth) of the highest layer (or referred to as the first layer) corresponds to a maximum SRS Bandwidth corresponding to the SRS Bandwidth configuration, or referred to as an SRS Bandwidth range. The UE calculates the SRS bandwidth according to the signaling indication of the base station, and then calculates the SRS bandwidth according to the upper layer signaling frequency domain position n sent by the eNB_RRCTo determine the initial position of the frequency domain where the SRS is transmitted. FIG. 2 is a prior art assignment of different n_RRCThe UE sends SRS with a frequency domain initial position diagram, as shown in fig. 2, different n are allocated_RRCWill transmit SRS in different regions of the cell SRS bandwidth, where the UE1 is a function of n_RRCDetermining the initial position of the frequency at which the SRS is transmitted, from n, the UE2_RRCDetermining the initial position of the frequency at which the SRS is transmitted, based on n, the UE3_RRCDetermining the initial position of the frequency at which the SRS is transmitted, based on n, for the UE4_RRCThe initial position of the frequency at which the SRS is transmitted is determined 6.

The sequence used by SRS is selected from the group of demodulation pilot sequences, and when the SRS bandwidth of the UE is 4 Resource blocks (RBs for short), a Computer Generated (CG) sequence with a length of 2 RBs is used; when the SRS bandwidth of the UE is greater than 4 RBs, a Zadoff-Chu (ZC) sequence of a corresponding length is used.

In addition, within the same SRS bandwidth, subcarriers (sub-carriers) of the SRS are spaced apart, that is, the SRS is transmitted in a comb structure, the number of frequency combs (frequency combs) in the LTE system is 2, and a RePetition Factor (RPF) corresponding to a time domain is 2. Fig. 3 is a schematic diagram of a comb structure of a SRS in the prior art, and as shown in fig. 3, when each UE transmits the SRS, only one of two frequency combs is used, and comb is 0 or comb is 1. In this way, the UE transmits the SRS using only subcarriers with even or odd frequency domain indices according to the frequency comb position indication of 1-bit upper layer signaling. This comb structure allows more UEs to transmit SRS within the same SRS bandwidth.

In the same SRS bandwidth, multiple UEs may use different cyclic shifts on the same frequency comb and then transmit SRS through code division multiplexing, or two UEs may transmit SRS through frequency division multiplexing on different frequency combs. For example, in the LTE system, a UE transmitting an SRS within a certain SRS bandwidth (4 RBs) may use 8 cyclic shifts and 2 frequency combs, so that the UE has 16 resources available for transmitting the SRS in total, that is, at most 16 SRS may be transmitted simultaneously within the SRS bandwidth. Since uplink Single User Multiple Input Multiple Output (SU-MIMO) is not supported in the LTE system, the UE can only have one antenna to transmit SRS at each time, so that only one SRS resource is needed for one UE, and thus, the system can multiplex 16 UEs at most simultaneously within the SRS bandwidth.

An LTE-Advanced (LTE-Advanced, abbreviated as LTE-a) system is a next-generation evolution system of the LTE system, supports SU-MIMO in uplink, and can use 4 antennas at most as uplink transmission antennas. That is, the UE may transmit SRS on multiple antennas at the same time, and the eNB needs to estimate the state on each channel according to the SRS received on each antenna.

In the existing research of LTE-a, it is proposed: in uplink communication, non-precoded (i.e., antenna-specific) SRS should be used, while DMRS for PUSCH should be precoded. The base station can estimate the original CSI of the uplink by receiving the non-precoded SRS, but the base station cannot estimate the original CSI of the uplink by the precoded DMRS. At this time, when the UE transmits the non-precoded SRS using multiple antennas, SRS resources required by each UE are increased, which results in a decrease in the number of UEs that can be simultaneously multiplexed in the system. How to reasonably design the configuration of the SRS resources to realize more effective and dynamic flexible SRS transmission and save signaling overhead is a problem to be solved.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method and a system for configuring a sounding reference signal, which are used for implementing the configuration of an aperiodic SRS and solving the problem that in the prior art, a UE cannot dynamically and flexibly transmit the aperiodic SRS.

In order to solve the above technical problem, the present invention provides a method for configuring a sounding reference signal, including:

the base station sends downlink control information to the user terminal, triggers the user terminal to send the aperiodic SRS through the downlink control information, and indicates resources used when the user terminal sends the aperiodic SRS.

Further, after receiving the downlink control information, the user terminal enters a process of sending an aperiodic SRS according to the triggering of the downlink control information and the resource indicated by the downlink control information.

Further, the ue acquires specific resources for sending the aperiodic SRS according to the resources indicated by the downlink control information and by combining aperiodic SRS resource type information configured in advance through a high-level signaling, where the resource type information includes any one of the following information: cyclic shift information, frequency domain position information, user-specific SRS bandwidth information, position information of a frequency comb.

Further, the downlink control information is downlink control information for downlink scheduling, and the downlink control information triggers the user terminal to transmit an aperiodic SRS and indicates resources used when the user terminal transmits the aperiodic SRS; or the downlink control information triggers the user terminal to send the aperiodic SRS when the downlink data is retransmitted, and indicates the resources used when the user terminal sends the aperiodic SRS.

Further, the triggering of the user terminal to transmit the aperiodic SRS through the downlink control information and the indication of the resources used by the user terminal to transmit the aperiodic SRS are implemented in the following manner:

the downlink control information carries a trigger bit and resource indication information, the trigger bit is used for triggering the user terminal to send the aperiodic SRS, and the resource indication information is used for indicating resources used when the user terminal sends the aperiodic SRS.

Further, the downlink control information is downlink control information for uplink scheduling, the trigger bit is a newly added bit or any one or any several of the following bits, the resource indication information is any one or any several of the following bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:

1 bit of frequency hopping identification bit; available bits of modulation coding mode and redundancy version indication information comprise: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; available bits of the cyclic shift indication information of the uplink demodulation reference signal comprise: wherein 1 bit or 2 bits; available bits of resource block allocation and frequency hopping resource allocation information, including: high 2 bits or high 3 bits.

Further, the downlink control information is downlink control information for indicating uplink multi-antenna transmission, the trigger bit is a newly added bit or any one or several of the following bits, the resource indication information is any one or several of the following bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:

1 bit of frequency hopping identification bit; the available bits of the modulation coding mode and the redundancy version indication information corresponding to the enabled transport block comprise: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; available bits of the cyclic shift indication information of the uplink demodulation reference signal comprise: wherein 1 bit or 2 bits; available bits of resource block allocation and frequency hopping resource allocation information, including: high 2 or high 3; when only one transport block is enabled, the indication information of the modulation coding mode and the redundancy version corresponding to the transport block is not enabled.

Further, the resource indication information is implemented in one or more of the following ways:

when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not adopt high-order modulation, any bit or any several bits in available bits of a frequency hopping identification bit and/or a modulation coding mode and redundancy version indication information are used as resource indication information;

when the uplink transmission block is the retransmission transmission block, using the modulation coding mode and the redundancy version indication information as the resource indication information, and using the modulation coding mode and the redundancy version indication information to index the modulation coding mode I_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29;

when the uplink transmission data is the retransmitted data or a new data indicator bit (NDI) is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indication information are adopted to indicate the redundancy version, and the rest 3 bits are used as resource indication information;

when the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or certain 2 or certain 4 cyclic shifts are adopted, any bit or any several bits in available bits of cyclic shift indication information of the uplink demodulation reference signal are used as resource indication information;

when the frequency hopping of the uplink PUSCH is not enabled and one of the following conditions is satisfied: the available quantity of cyclic shift of the uplink demodulation reference signal is 2 or 4, or certain 2 or certain 4 cyclic shifts are adopted, and any bit or any several bits in the frequency hopping identification bit and the available bits of the cyclic shift indication information of the uplink demodulation reference signal are used as resource indication information;

when the unit of the PUSCH resource allocation of the user terminal is 2 Resource Blocks (RBs), any one or several bits of available bits of resource block allocation and frequency hopping resource allocation information are used as resource indication information.

Further, the trigger bit is implemented in one or more of the following ways:

when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not adopt high-order modulation (64QAM), any one of a frequency hopping identification bit or a modulation coding mode and available bits of redundancy version indication information is used as a trigger bit;

when the uplink transmission block is the retransmission transmission block, using the modulation coding mode and the redundancy version indication information as trigger bits, and using the modulation coding mode and the redundancy version indication information to index the modulation coding mode I_MCSAny of k states, indicated as 0 to 28, 1 ≦ k ≦ 29 to trigger the aperiodic SRS;

when the uplink transmitted data is retransmitted data or a new data indicator bit (NDI) is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indication information are adopted to indicate the redundancy version, and any one or more of the remaining 3 bits are used as trigger bits;

when the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or certain 2 or certain 4 cyclic shifts are adopted, any one of available bits of cyclic shift indication information of the uplink demodulation reference signal is used as a trigger bit;

when the unit of the PUSCH resource allocation of the user terminal is 2 resource blocks, any one bit of available bits of resource block allocation and frequency hopping resource allocation information is used as a trigger bit.

Further, the downlink control information is downlink control information for downlink scheduling, the trigger bit is a newly added bit or any one or any several of the following bits, the resource indication information is any one or any several of the following bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:

the available bits of the modulation coding mode indication information comprise: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; a 2-bit redundancy version bit; 1 bit centralized/distributed VRB distribution identification bit; available bits of resource block allocation information, including: high 2 bits or high 3 bits.

when the retransmission combination limiting mode is tracking combination or the number of usable redundant versions is 1 or 2, any bit or any several bits in the redundant version bits are used as resource indication information;

when the Virtual Resource Block (VRB) allocation is fixedly centralized or distributed or the PDSCH does not adopt high-order modulation, any bit or any several bits in available information of centralized/distributed VRB allocation identification bits and/or modulation coding mode indication information are used as resource indication information;

when the downlink transmission block is a retransmission transmission block, using modulation coding mode indication information as resource indication information, and using the modulation coding mode indication information to index I the modulation coding mode_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29;

when the downlink transmission data is retransmitted data or a new data indicator bit (NDI) is 0, 2 bits in the 5-bit modulation coding mode indication information are used for indicating a redundancy version, and the rest 3 bits are used as resource indication information;

when the redundancy version is fixed to one or two, 1 bit or two bits in the redundancy version are used as resource indication information;

when the unit of the PDSCH resource allocation of the user terminal is 2 resource blocks, any one or several bits of available bits of the resource block allocation information are used as the resource indication information.

Further, the trigger bit is implemented in one or more of the following ways:

when the retransmission combination limiting mode is tracking combination or the number of usable redundant versions is 1 or 2, any one of the redundant version bits is used as a trigger bit;

when VRB allocation is fixedly centralized or distributed or PDSCH does not adopt high-order modulation, any bit of centralized/distributed VRB allocation identification bits or available bits of modulation coding mode indication information is used as a trigger bit;

when the uplink transmission block is the retransmission transmission block, using the modulation coding mode indication information as a trigger bit, and using the modulation coding mode indication information to index the modulation coding mode I_MCSAny of k states, indicated as 0 to 28, 1 ≦ k ≦ 29 to trigger the aperiodic SRS;

when the data transmitted in the downlink is retransmitted data or a new data indicator bit (NDI) is 0, 2 bits in the indication information of a 5-bit modulation coding mode are used for indicating a redundancy version, and any one or more bits in the remaining 3 bits are used as trigger bits;

when the redundancy version is fixed to one or two, 1 bit or two bits in the redundancy version are used as trigger bits;

when the unit of PDSCH resource allocation of the user terminal is 2 RBs, any one of the available bits of the resource block allocation information is used as a trigger bit.

Further, the triggering of the user terminal to transmit the aperiodic SRS through the downlink control information and the indication of the resources used by the user terminal to transmit the aperiodic SRS are implemented in the following manner: the downlink control information carries joint indication information for triggering the aperiodic SRS and indicating resources, and the joint indication information is used for triggering the user terminal to send the aperiodic SRS and indicating the resources used when the user terminal sends the aperiodic SRS.

Further, the downlink control information is downlink control information for uplink scheduling, and the joint indication information is any of the following bits: 1 bit of frequency hopping identification bit; available bits of modulation coding mode and redundancy version indication information comprise: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; available bits of the cyclic shift indication information of the uplink demodulation reference signal comprise: wherein 1 bit or 2 bits; available bits of resource block allocation and frequency hopping resource allocation information, including: high 2 bits or high 3 bits.

Further, the downlink control information is downlink control information for indicating uplink multi-antenna transmission, and the joint indication information is any of the following bits: 1 bit of frequency hopping identification bit; the available bits of the modulation coding mode and the redundancy version indication information corresponding to the enabled transport block comprise: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; available bits of the cyclic shift indication information of the uplink demodulation reference signal comprise: wherein 1 bit or 2 bits; available bits of resource block allocation and frequency hopping resource allocation information, including: high 2 or high 3; when only one transport block is enabled, the indication information of the modulation coding mode and the redundancy version corresponding to the transport block is not enabled.

Further, the joint indication information is implemented in one or more of the following ways:

when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not adopt high-order modulation, using the frequency hopping identification bit and any bits of available bits of the modulation coding mode and the redundancy version indication information as joint indication information, or using only any bits of the available bits of the modulation coding mode and the redundancy version indication information as joint indication information;

when the uplink transmission block is the retransmission transmission block, using the modulation coding mode and the redundancy version indication information as joint indication information, and using the modulation coding mode and the redundancy version indication information to index the modulation coding mode I_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29;

when the uplink transmitted data is retransmitted data or a new data indicator bit (NDI) is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indication information are adopted to indicate the redundancy version, and the rest 3 bits are used as joint indication information;

when the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or certain 2 or certain 4 cyclic shifts are adopted, any several bits in available bits of cyclic shift indication information of the uplink demodulation reference signal are used as joint indication information;

when the frequency hopping of the uplink PUSCH is not enabled and one of the following conditions is satisfied: the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted fixedly, and any several bits in the frequency hopping identification bit and the available bits of the cyclic shift indication information of the uplink demodulation reference signal are used as joint indication information;

when the unit of the PUSCH resource allocation of the user terminal is 2 RBs, any several bits of available bits of resource block allocation and frequency hopping resource allocation information are used as joint indication information.

Further, the downlink control information is downlink control information for downlink scheduling, and the joint indication information is any of the following bits:

the available bits of the modulation coding mode indication information comprise: high 1 bit or high 2 bit or high 3bit or all bits; a 2-bit redundancy version bit; 1 bit centralized/distributed VRB distribution identification bit; available bits of resource block allocation information, including: high 2 bits or high 3 bits.

when the retransmission combination limiting mode is tracking combination or the number of usable redundant versions is 1 or 2, any bits in the redundant version bits are used as joint indication information;

when Virtual Resource Block (VRB) allocation is fixedly centralized or distributed, or PDSCH does not adopt high-order modulation, any bits of centralized/distributed VRB allocation identification bits and available bits of modulation and coding mode indication information are used as joint indication information, or only any bits of the available bits of the modulation and coding mode indication information are used as joint indication information;

when the downlink transmission block is a retransmission transmission block, using the modulation coding mode indication information as joint indication information, and using the modulation coding mode indication information to index the modulation coding mode I_MCSAny one of 0 to 28 to indicate an aperiodic SRS resource;

when the downlink transmission data is retransmitted data or a new data indicator bit (NDI) is 0, 2 bits in the 5-bit modulation coding mode indication information are used for indicating a redundancy version, and the rest 3 bits are used as joint indication information;

when the redundancy version is fixed to a certain one, 2-bit redundancy version bits are adopted as joint indication information;

when the unit of the PDSCH resource allocation of the user terminal is 2 resource blocks, any several bits of available bits of the resource block allocation information are used as the joint indication information.

In order to solve the above technical problem, the present invention further provides a system for configuring a sounding reference signal, including a base station and a user equipment, wherein:

the base station is used for sending downlink control information to a user terminal, triggering the user terminal to send an aperiodic SRS through the downlink control information, and indicating resources used when the user terminal sends the aperiodic SRS;

and the user terminal is used for sending the aperiodic SRS at the resource indicated by the downlink control information after receiving the downlink control information.

By adopting the configuration method of the aperiodic SRS, the terminal can transmit the aperiodic SRS, the utilization rate of SRS resources is improved, and the flexibility of resource scheduling is improved.

Drawings

FIG. 1 is a schematic diagram of a time domain location of a demodulation reference signal of the prior art;

FIG. 2 is a prior art assignment of different n_RRCThe frequency domain initial position schematic diagram of the SRS sent by the UE;

FIG. 3 is a schematic diagram of a comb structure of a prior art SRS;

fig. 4 is a schematic structural diagram of a configuration system of the aperiodic SRS of the present invention.

Detailed Description

In addition to periodic (periodic) SRS transmission in the existing LTE, in order to improve the utilization of SRS resources and improve the flexibility of resource scheduling, the UE may also be configured to aperiodically (aperiodic) SRS transmission through downlink control information.

The invention has the following inventive concept: the base station sends downlink control information to the user terminal, triggers the user terminal to send the aperiodic SRS through the downlink control information, and indicates resources used when the user terminal sends the aperiodic SRS.

The configuration method enables the UE to dynamically, flexibly and non-periodically send the SRS, and improves the utilization rate of SRS resources.

And after receiving the downlink control information, the user terminal enters a process of sending the non-periodic SRS according to the triggering of the downlink control information and the resource indicated by the downlink control information.

Preferably, the user terminal may obtain specific resources for transmitting the aperiodic SRS according to the resources indicated by the downlink control information and by combining the aperiodic SRS resource type information configured in advance through a high-level signaling. The resource type information includes any one of the following information: cyclic shift information, frequency domain position information, user-specific SRS bandwidth information, position information of a frequency comb.

Preferably, the downlink control information is downlink control information for downlink scheduling, and the downlink control information triggers the user terminal to transmit an aperiodic SRS and indicates resources used when the user terminal transmits the aperiodic SRS; or the downlink control information triggers the user terminal to send the aperiodic SRS when the downlink data is retransmitted, and indicates the resources used when the user terminal sends the aperiodic SRS.

The triggering of the user terminal to send the aperiodic SRS through the downlink control information and the indication of the resources used by the user terminal to send the aperiodic SRS have the following two preferred implementation manners:

the first method is as follows: the downlink control information carries a trigger bit and resource indication information, the trigger bit is used for triggering the user terminal to send the aperiodic SRS, and the resource indication information is used for indicating resources used when the user terminal sends the aperiodic SRS.

Preferably, the trigger bit occupies 1 or more bits; the resource indication information occupies n bits, n is an integer and is more than or equal to 1 and less than 15.

● when the base station triggers by the downlink control information for uplink scheduling and instructs the user terminal to transmit the aperiodic SRS, the base station can select any one or any several of the following bits or use the newly added bit as the trigger bit, and select any one or any several of the following bits as the resource indication information, and the selection needs to ensure that the trigger bit does not collide with the bit used by the resource indication information:

a 1-bit frequency hopping flag (hopping flag); available bits of Modulation and coding scheme and redundancy version (Modulation and coding scheme and redundancy version) indication information comprise: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; available bits of the cyclic shift indication information of the uplink demodulation reference signal comprise: wherein 1 bit or 2 bits; available bits of Resource block allocation and hopping Resource allocation (Resource block allocation and hopping Resource allocation) information, including: high 2 bits or high 3 bits.

Specifically, the method comprises the following steps:

when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not adopt high-order modulation (64QAM), any one or several of the frequency hopping identification bit and/or the modulation coding mode and the available bits of the redundancy version indication information can be used as the resource indication information to indicate the resource for transmitting the aperiodic SRS. Likewise, when the uplink PUSCH is not frequency hopping enabled and/or the PUSCH does not employ high order modulation (64QAM), any one of the frequency hopping identification bits or the modulation coding scheme and the bits available for the redundancy version indication information may be used as a trigger bit to trigger the transmission of the aperiodic SRS. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the uplink transmission block is the retransmission transmission block, using the modulation coding mode and the redundancy version indication information as the resource indication information, and using the modulation coding mode and the redundancy version indication information to index the modulation coding mode I_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29. Similarly, when the uplink transport block is the retransmission transport block, the modulation coding mode and the redundancy version indication information are used as trigger bits, and the modulation coding mode index I is indexed through the modulation coding mode and the redundancy version indication information_MCSAny of k states, indicated as 0 to 28, triggers aperiodic SRS. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the uplink transmission data is the retransmitted data or the new data indicator bit (NDI) is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indication information are used to indicate the redundancy version, and the remaining 3 bits are used as the resource indication information. Similarly, when the data transmitted in the uplink is retransmitted data or a new data indicator bit (NDI) is 0, 2 bits in the 5-bit modulation coding scheme and the redundancy version indicator information are used to indicate the redundancy version, and any one or several of the remaining 3 bits are used as a trigger bit. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted fixedly, any bit or any several bits in available bits of cyclic shift indication information of the uplink demodulation reference signal can be used as resource indication information to indicate resources for transmitting the aperiodic SRS. Similarly, when the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted, any one of the available bits of the cyclic shift indication information of the uplink demodulation reference signal can be used as a trigger bit to trigger the transmission of the aperiodic SRS. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the frequency hopping of the uplink PUSCH is not enabled and one of the following conditions is satisfied: the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted fixedly, and any bit or any several bits in the frequency hopping identification bit and the available bits of the cyclic shift indication information of the uplink demodulation reference signal are used as the resource indication information.

When the unit of PUSCH Resource allocation of a user terminal is 2 RBs (Resource Block), any one or several of available bits of Resource Block allocation and frequency hopping Resource allocation information may be used as Resource indication information to indicate a Resource for transmitting an aperiodic SRS. Similarly, when the unit of PUSCH resource allocation for a user terminal is 2 RBs, transmission of an aperiodic SRS may be triggered using any one of the resource block allocation and hopping resource allocation information available bits as a trigger bit. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

The above-mentioned several approaches can be used in combination without conflict.

Preferably, when the downlink control information for uplink scheduling is used to indicate uplink multi-antenna transmission, in addition to the optional bits, when only one transport block is enabled, a bit may be selected from indication information (e.g., 5 bits) of a modulation coding scheme and a redundancy version corresponding to an un-enabled transport block as a trigger bit and/or as resource indication information. The format of the downlink control information at this time is called as: and the downlink control information format is used for indicating uplink multi-antenna transmission.

● when the base station triggers by the downlink control information for downlink scheduling and instructs the user terminal to transmit the aperiodic SRS, any one or several of the following bits or newly added bits can be used as the trigger bit, and any one or several of the following bits can be used as the resource indication information, and it is necessary to ensure that the trigger bit does not collide with the bit used by the resource indication information:

available bits of Modulation and coding scheme (Modulation and coding scheme) indication information include: high 1 bit or high 2 bit or high 3bit or high 4 bit or all bits; a 2-bit redundancy version bit; 1-bit centralized/Distributed VRB allocation identification bit (Localized/Distributed VRBassignment flag); available bits of Resource block allocation (Resource block allocation) information, including: high 2 bits or high 3 bits.

Specifically, the method comprises the following steps:

when the retransmission Combining restriction is CC (Chase Combining) Combining, or when the number of usable redundancy versions is 1 or 2, any one or several of the redundancy version bits may be used as the resource indication information to indicate the resource for transmitting the aperiodic SRS. Similarly, when the retransmission combining method is limited to CC combining, or when the number of usable redundancy versions is 1 or 2, any one of the redundancy version bits may be used as a trigger bit to trigger the transmission of the aperiodic SRS. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When VRB (Virtual Resource Block) allocation is fixed in a centralized or distributed manner, or PDSCH does not use high-order Modulation (64QAM), any one or several bits of centralized/distributed VRB allocation identification bits and/or Modulation and coding scheme (Modulation and coding scheme) indication information available information can be used as Resource indication information to indicate the Resource for transmitting the aperiodic SRS. Likewise, when the VRB allocation is fixed in a centralized or distributed manner or the PDSCH does not adopt high-order modulation, any one of the centralized/distributed VRB allocation identification bits or the available bits of the modulation and coding scheme indication information may be used as a trigger bit to trigger the transmission of the aperiodic SRS. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the downlink transmission block is a retransmission transmission block, the modulation coding mode indication is usedInformation is used as resource indication information, and modulation coding mode index I is obtained through the modulation coding mode indication information_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29. Similarly, when the uplink transport block is the retransmission transport block, using the modulation and coding scheme indication information as the trigger bit, and using the modulation and coding scheme indication information to convert the modulation and coding scheme index I into the modulation and coding scheme index I_MCSAny of k states, indicated as 0 to 28, triggers aperiodic SRS. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the downlink transmission data is the retransmitted data or the new data indicator bit (NDI) is 0, 2 bits in the 5-bit modulation coding mode indicator information are used to indicate the redundancy version, and the remaining 3 bits are used as the resource indicator information. Similarly, when the data to be transmitted in the downlink is retransmitted data or the new data indicator bit (NDI) is 0, 2 bits in the 5-bit modulation and coding scheme indicator information are used to indicate the redundancy version, and any one or several of the remaining 3 bits are used as the trigger bit. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

When the redundancy version is fixed to one or two, 1 bit or two bits in the redundancy version are used as the resource indication information. Similarly, when the redundancy version is fixed to one or both of them, 1 bit or two bits in the redundancy version are used as the trigger bit. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

As a user terminalWhen the unit of PDSCH resource allocation of (2) rbs (resource block), the resource for transmitting the aperiodic SRS may be indicated using any one or several bits of available bits of resource block allocation information as resource indication information. Similarly, when the unit of PDSCH resource allocation of the user terminal is 2 RBs, transmission of the aperiodic SRS may be triggered using any one of the available bits of the resource block allocation information as a trigger bit. But it is necessary to ensure that the bits used by the resource indication information do not collide with the bits used by the trigger bit.

Preferably, the format of the downlink control information for uplink scheduling is format 0; the format of the downlink control information for downlink scheduling is format 1A.

The second method comprises the following steps: the downlink control information carries joint indication information for triggering the aperiodic SRS and indicating resources, and the joint indication information is used for triggering the user terminal to send the aperiodic SRS and indicating the resources used when the user terminal sends the aperiodic SRS. Namely, the joint indication information has the functions of triggering and indicating resources at the same time.

Preferably, the joint indication information occupies m bits, m is an integer and 2 ≦ m < 15.

● when the base station triggers and instructs the user terminal to transmit the aperiodic SRS through the downlink control information for uplink scheduling, any of the following bits can be used as the joint instruction information:

Specifically, the method comprises the following steps:

when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not adopt high-order modulation (64QAM), the resource for transmitting the aperiodic SRS can be indicated by using the frequency hopping identification bit and any bits of available bits of the modulation coding scheme and the redundancy version indication information as joint indication information, or only any bits of the available bits of the modulation coding scheme and the redundancy version indication information as joint indication information.

When the uplink transmission block is the retransmission transmission block, using the modulation coding mode and the redundancy version indication information as joint indication information, and using the modulation coding mode and the redundancy version indication information to index the modulation coding mode I_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29.

When the uplink transmitted data is retransmitted data or a new data indicator bit (NDI) is 0, a 5-bit modulation coding scheme and 2 bits in the redundancy version indication information are used to indicate the redundancy version, and the remaining 3 bits are used as joint indication information.

When the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted fixedly, any several bits of available bits of cyclic shift indication information of the uplink demodulation reference signal can be used as joint indication information to indicate resources for transmitting the aperiodic SRS.

When the frequency hopping of the uplink PUSCH is not enabled and one of the following conditions is satisfied: the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted fixedly, and any several bits of the frequency hopping identification bits and the available bits of the cyclic shift indication information of the uplink demodulation reference signal are used as joint indication information.

When the unit of PUSCH resource allocation for a user terminal is 2 rbs (resource block), several arbitrary bits of available bits of resource block allocation and frequency hopping resource allocation information may be used as joint indication information to indicate resources for transmitting an aperiodic SRS.

Preferably, when the downlink control information for uplink scheduling is used to indicate uplink multi-antenna transmission, in addition to the optional bits, when only one transport block is enabled, bits may be selected from the indication information (5 bits) of the modulation coding scheme and the redundancy version corresponding to the non-enabled transport block as the joint indication information. The format of the downlink control information at this time is called as: and the downlink control information format is used for indicating uplink multi-antenna transmission.

● when the base station triggers and instructs the user terminal to transmit the aperiodic SRS through the downlink control information for downlink scheduling, any of the following bits can be used as the joint instruction information:

Specifically, the method comprises the following steps:

when the retransmission Combining method is restricted to CC (Chase Combining) Combining, or when the number of usable redundancy versions is 1 or 2, any several bits of the redundancy version bits may be used as joint indication information to indicate the resource for transmitting the aperiodic SRS.

When VRB (Virtual Resource Block) allocation is fixed in a centralized or distributed manner, or PDSCH does not adopt high-order Modulation (64QAM), resources for transmitting aperiodic SRS may be indicated using any several bits of centralized/distributed VRB allocation flag bits and Modulation and coding scheme (Modulation and coding scheme) indication information available bits as joint indication information, or using any several bits of Modulation and coding scheme indication information available bits as joint indication information.

When the downlink transmission block is a retransmission transmission block, using the modulation coding mode indication information as joint indication information, and using the modulation coding mode indication information to index the modulation coding mode I_MCSAny one of 0 to 28 is indicated to indicate the aperiodic SRS resource.

When the downlink transmission data is the retransmitted data or the new data indicator bit (NDI) is 0, 2 bits in the 5-bit modulation coding mode indicator information are used to indicate the redundancy version, and the remaining 3 bits are used as the joint indicator information.

When the redundancy version is fixed to a certain one, 2-bit redundancy version bits are adopted as joint indication information.

When the unit of PDSCH resource allocation of the user terminal is 2 rbs (resource block), any several bits of available bits of resource block allocation information may be used as joint indication information to indicate resources for transmitting the aperiodic SRS.

The configuration system for implementing the method includes a base station and a user terminal(s), as shown in fig. 4, where:

Example one

The base station triggers the user terminal to send the non-periodic SRS through the downlink control information, and indicates the user terminal to select the non-periodic SRS through the downlink control information.

In this embodiment, the downlink control information is downlink control information for uplink single-antenna transmission, and has a format of format 0.

The base station may agree with the user terminal to:

when frequency hopping of the uplink PUSCH does not enable and/or restrict PUSCH from employing high order modulation (64QAM), transmission of the aperiodic SRS and the resource indicating the aperiodic SRS may be triggered in any of the following ways:

1) using 1 bit frequency hopping flag bit and 1 bit modulation coding mode and redundancy version high order to form 2 bits as joint indication information for triggering non-periodic SRS and indicating resources;

2) using a 1-bit frequency hopping flag bit as a trigger bit, and using a modulation coding mode and a high 1 bit or a high 2 bit of a redundancy version as resource indication information;

3) using the high 1 bit of the modulation coding mode and the redundancy version indication information as a trigger bit, and using the second high bit as resource indication information;

4) using the high-order 2 bits of the modulation coding mode and the redundancy version indication information as joint indication information for triggering the aperiodic SRS and indicating resources;

5) the trigger bit is newly added 1 bit, and the high 1 bit or the high 2 bit of the frequency hopping flag bit and/or the modulation coding mode and the redundancy version is used as the resource indication information;

when the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are fixedly adopted, any one of the following manners may be adopted to trigger the transmission of the aperiodic SRS and to indicate the resource of the aperiodic SRS:

1) 2 bits in the cyclic shift indication information of the uplink demodulation reference signal are used as joint indication information for triggering the aperiodic SRS and indicating resources;

2) and using 1 bit in the 3-bit cyclic shift indication information of the uplink demodulation reference signal as a trigger bit, and using the other bit as resource indication information.

When the frequency hopping of the uplink PUSCH is not enabled and the following conditions are satisfied: the available number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or some 2 or some 4 cyclic shifts are adopted fixedly, and some 1 bit or 2 bits in the frequency hopping flag bit and the uplink demodulation reference signal cyclic shift indication information can be used as resource indication information.

The above conventions may exist simultaneously as long as no conflict occurs.

Example two

In this embodiment, the downlink control information is downlink control information for uplink multi-antenna transmission.

The base station may agree with the user terminal to:

when the available number of cyclic shifts of the uplink demodulation reference signal is 2, or some 2 cyclic shifts are fixedly adopted, any one of the following manners may be adopted to trigger the transmission of the aperiodic SRS and to indicate the resource of the aperiodic SRS:

2) using 1 bit in 2-bit cyclic shift indication information of an uplink demodulation reference signal as a trigger bit, and using the other bit as resource indication information;

when the PUSCH cannot employ high order modulation (64QAM), the transmission of the aperiodic SRS and the resource indicating the aperiodic SRS may be triggered in the following manner: using newly added 1 bit as a trigger bit, and using a modulation coding mode and the high 1 bit of the redundancy version indication information as resource indication information;

when only one transport block is enabled, the transmission of the aperiodic SRS and the resource indicating the aperiodic SRS may be triggered in any of the following ways:

1) using 1 bit in the indication information of the modulation coding mode and the redundancy version corresponding to the disabled transmission block as a trigger bit, and using the rest bits as resource indication information;

2) and using a plurality of bits in the indication information of the modulation coding mode and the redundancy version corresponding to the non-enabled transport block as joint indication information for triggering the aperiodic SRS and indicating the resources.

The above conventions may exist simultaneously as long as no conflict occurs.

EXAMPLE III

In this embodiment, the downlink control information is downlink control information for downlink scheduling, and has a format of format 1A.

The base station may agree with the user terminal to:

when the RV version is fixed to 00, or the retransmission combining restriction mode is CC combining, or when the transmitted data is new data, or the new data indicator bit NDI is 1, any one of the following modes may be used to trigger the transmission of the aperiodic SRS and indicate the resources of the aperiodic SRS:

1) using newly added 1 bit as a trigger bit and using a redundant version bit of 2 bits as resource indication information;

2) using 1 bit in the 2-bit redundancy version bit as a trigger bit, and using the other bit as resource indication information;

3) 2-bit redundancy version bits are used as joint indication information for triggering the aperiodic SRS and indicating resources;

when VRB allocation is fixed in centralized or distributed mode, and PUSCH is restricted from high order modulation (64QAM), transmission of aperiodic SRS and resource indicating aperiodic SRS can be triggered in any of the following ways:

1) using 1 bit centralized/distributed VRB allocation identification bit as a trigger bit and using the high 1 bit of modulation coding mode indication information as resource indication information;

2) and 2 bits are formed by 1-bit centralized/distributed VRB allocation identification bit and high 1 bit of modulation coding mode indication information and are used as joint indication information for triggering the aperiodic SRS and indicating resources.

The above conventions may exist simultaneously as long as no conflict occurs.

Example four

In this embodiment, the downlink control information is downlink control information for downlink scheduling, and has a format of format 1A. And the aperiodic SRS is triggered only at the time of downlink data retransmission (NDI ═ 0).

The base station may agree with the user terminal to:

when NDI is 0 and the retransmission restriction combining scheme is CC combining, any one of the following schemes may be adopted to trigger transmission of the aperiodic SRS and to indicate the resource of the aperiodic SRS:

1) using 2-bit redundancy version bits as joint indication information for triggering the aperiodic SRS and indicating resources;

2) using 1 bit in 2-bit redundancy version as trigger bit, and using another bit as resource indication information;

when NDI is 0 and VRB allocation is fixed with centralized or distributed, and PUSCH is restricted from adopting high order modulation (64QAM), transmission of aperiodic SRS and resource indicating aperiodic SRS may be triggered in any of the following ways:

3) The trigger bit is newly added 1 bit, and 2 bits are formed by the high 1 bit of the modulation coding mode indication information and the centralized/distributed VRB allocation identification bit of 1 bit as resource indication information.

3) The trigger bit is newly added 1 bit, and some 3 bits in the modulation coding mode indication information are used as resource indication information.

The above conventions may exist simultaneously as long as no conflict occurs.

EXAMPLE five

In this embodiment, the downlink control information is downlink control information used for uplink scheduling.

The base station may agree with the user terminal to:

when the unit of PUSCH resource allocation for the user terminal is 2 RBs, the transmission of the aperiodic SRS and the resource indicating the aperiodic SRS may be triggered in any of the following manners:

1) using newly added 1 bit as a trigger bit, and using the high 2 bits or the high 3 bits in the resource block allocation and frequency hopping resource allocation information as resource indication information;

2) and using the high 2 bits or the high 3 bits in the resource block allocation and frequency hopping resource allocation information as joint indication information for triggering the aperiodic SRS and indicating the resources.

EXAMPLE six

In this embodiment, the downlink control information is downlink control information for downlink scheduling.

The base station may agree with the user terminal to:

when the unit of PDSCH resource allocation for the user terminal is 2 RBs, the transmission of the aperiodic SRS and the resource indicating the aperiodic SRS may be triggered in any of the following manners:

1) using newly added 1 bit as a trigger bit, and using the high 2 bits or the high 3 bits in the resource block allocation information as resource indication information;

2) and using the high 2 bits or the high 3 bits in the resource block allocation information as joint indication information.

EXAMPLE seven

The base station may agree with the user terminal to:

when the uplink transmission block is the modulation coding mode of the retransmission transmission block and the modulation coding mode index I indicated by the redundancy version indication information_MCSFrom 0 to 28:

1) with newly added 1 bit as a triggerBits, using modulation coding mode and redundancy version indication information as resource indication information, by which modulation coding mode index I is indexed_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29;

2) using modulation coding mode indication information as joint indication information, and using the modulation coding mode and redundancy version indication information to index I into modulation coding mode_MCSAny of k states from 0 to 28 are indicated to indicate aperiodic SRS resources, 1 ≦ k ≦ 29.

When the uplink transmission data is the retransmitted data or the new data indicator bit NDI is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indicator information are used for indicating the redundancy version, and the remaining 3 bits are used for triggering the user terminal to transmit the aperiodic SRS and indicating the aperiodic SRS resource used by the user terminal, or only triggering the user terminal to transmit the aperiodic SRS, or only indicating the aperiodic SRS resource used by the user terminal.

Example eight

The base station may agree with the user terminal to:

when the downlink transmission block is the modulation coding mode index I indicated by the modulation coding mode indication information of the retransmission transmission block_MCSFrom 0 to 28:

1) using newly added 1 bit as trigger bit, using modulation coding mode indication information as resource indication information, and using modulation coding mode index I by the modulation coding mode and redundancy version indication information_MCSIs indicated asAny of k states 0 to 28 to indicate aperiodic SRS resources, 1 ≦ k ≦ 29; or

When the redundancy version is fixed to one or two, 1 bit or two bits in the redundancy version are adopted to trigger the user terminal to send the aperiodic SRS and indicate the aperiodic SRS resource used by the user terminal, or only trigger the user terminal to send the aperiodic SRS, or only indicate the aperiodic SRS resource used by the user terminal.

When the data transmitted in the downlink is retransmitted data or the new data indicator bit NDI is 0, 2 bits in the 5-bit modulation coding mode indicator information are used to indicate a modulation mode, and the remaining 3 bits are used to trigger the user terminal to transmit an aperiodic SRS and indicate aperiodic SRS resources used by the user terminal, or only trigger the user terminal to transmit an aperiodic SRS, or only indicate the aperiodic SRS resources used by the user terminal.

The above embodiments are merely examples, and various embodiments may be combined without conflict. Because the combination mode is more, the combination mode is not listed in the text.

What the resource type of the pre-configured aperiodic SRS is independent of whether the mode one or the mode two is adopted, and which bits are specifically used. The resource type is only related to the content of the resource information (resource indication information or joint indication information that triggers aperiodic SRS and indicates resources). For example, the resource type information indicates that the resource type is a frequency domain position, and the information carried in the resource information indicates a specific frequency domain position at this time. For another example, the aperiodic SRS resource type is preconfigured by a higher layer signaling as cyclic shift, and four kinds of cyclic shifts selectable for transmitting the aperiodic SRS are preconfigured, so that the cyclic shift used for transmitting the aperiodic SRS can be further configured as any one of the four kinds of cyclic shifts by using the resource information in the downlink control information.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for configuring a measurement reference signal includes:

a base station sends downlink control information to a user terminal, triggers the user terminal to send an aperiodic SRS through the downlink control information, and indicates resources used when the user terminal sends the aperiodic SRS;

wherein,

and the user terminal acquires specific resources for transmitting the aperiodic SRS according to the resources indicated by the downlink control information and by combining the aperiodic SRS resource type information configured in advance through the high-level signaling.

2. The method of claim 1, wherein:

3. The method of claim 1 or 2, wherein:

the resource type information includes any one of the following information: cyclic shift information, frequency domain position information, user-specific SRS bandwidth information, position information of a frequency comb.

4. The method of claim 1, wherein:

the downlink control information is used for downlink scheduling, triggers the user terminal to transmit an aperiodic SRS and indicates resources used when the user terminal transmits the aperiodic SRS; or the downlink control information triggers the user terminal to send the aperiodic SRS when the downlink data is retransmitted, and indicates the resources used when the user terminal sends the aperiodic SRS.

5. The method of claim 1, wherein:

the triggering of the user terminal to send the aperiodic SRS through the downlink control information and the indication of the resources used by the user terminal to send the aperiodic SRS are realized by adopting the following modes:

6. The method of claim 5, wherein:

the trigger bit occupies 1 or more bits; the resource indication information occupies n bits, n is an integer and is more than or equal to 1 and less than 15.

7. The method of claim 5, wherein:

the downlink control information is downlink control information for uplink scheduling, the trigger bit is a newly added bit or any one or several of the following bits, the resource indication information is any one or several of the following bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:

8. The method of claim 5, wherein:

the downlink control information is used for indicating uplink multi-antenna transmission, the trigger bit is a newly added bit or any one or any several of the following bits, the resource indication information is any one or any several of the following bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:

9. The method of claim 7 or 8, wherein:

the resource indication information is realized by one or more of the following modes:

when the uplink transmitted data is retransmitted data or the new data indicator bit NDI is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indicator information are adopted to indicate the redundancy version, and the rest 3 bits are used as resource indicator information;

when the unit of the PUSCH resource allocation of the user terminal is 2 resource blocks RB, any one or several of the available bits of the resource block allocation and frequency hopping resource allocation information is used as the resource indication information.

10. The method of claim 7 or 8, wherein:

the trigger bit is realized by one or more of the following modes:

when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not adopt high-order modulation 64QAM, any one of available bits of a frequency hopping identification bit or a modulation coding mode and redundancy version indication information is used as a trigger bit;

when the uplink transmitted data is retransmitted data or the new data indicator bit NDI is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indicator information are adopted to indicate the redundancy version, and any one or more of the rest 3 bits are used as trigger bits;

11. The method of claim 5, wherein:

the downlink control information is downlink control information for downlink scheduling, the trigger bit is a newly added bit or any one or several of the following bits, the resource indication information is any one or several of the following bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:

12. The method of claim 11, wherein:

when the virtual resource block VRB allocation fixedly adopts a centralized type or a distributed type, or the PDSCH does not adopt high-order modulation, any bit or any several bits in available information of centralized/distributed VRB allocation identification bits and/or modulation coding mode indication information are used as resource indication information;

when the downlink transmission data is retransmitted data or a new data indicator bit NDI is 0, 2 bits in the indication information of a 5-bit modulation coding mode are adopted to indicate a redundancy version, and the rest 3 bits are used as resource indication information;

13. The method of claim 11, wherein:

the trigger bit is realized by one or more of the following modes:

when the downlink transmission data is retransmitted data or a new data indication bit NDI is 0, 2 bits in the indication information of a 5-bit modulation coding mode are adopted to indicate a redundancy version, and any one or more of the rest 3 bits are used as a trigger bit;

14. The method of claim 1, wherein:

the downlink control information carries joint indication information for triggering the aperiodic SRS and indicating resources, and the joint indication information is used for triggering the user terminal to send the aperiodic SRS and indicating the resources used when the user terminal sends the aperiodic SRS.

15. The method of claim 14, wherein:

the joint indication information occupies m bits, m is an integer and is more than or equal to 2 and less than 15.

16. The method of claim 14, wherein:

the downlink control information is downlink control information for uplink scheduling, and the joint indication information is any of the following bits:

17. The method of claim 14, wherein:

the downlink control information is used for indicating uplink multi-antenna transmission, and the joint indication information is any of the following bits:

18. The method of claim 16 or 17, wherein:

the joint indication information is realized in one or more of the following ways:

when the uplink transmitted data is retransmitted data or the new data indicator bit NDI is 0, a 5-bit modulation coding mode and 2 bits in the redundancy version indicator information are adopted to indicate the redundancy version, and the rest 3 bits are used as joint indicator information;

19. The method of claim 14, wherein:

the downlink control information is downlink control information for downlink scheduling, and the joint indication information is any of the following bits:

20. The method of claim 19, wherein:

when the virtual resource block VRB allocation fixedly adopts a centralized type or a distributed type, or the PDSCH does not adopt high-order modulation, any bits in the centralized/distributed VRB allocation identification bits and the available bits of the modulation and coding mode indication information are used as joint indication information, or only any bits in the available bits of the modulation and coding mode indication information are used as joint indication information;

when the downlink transmission data is retransmitted data or a new data indicator bit NDI is 0, 2 bits in the indication information of a 5-bit modulation coding mode are adopted to indicate a redundancy version, and the rest 3 bits are used as joint indication information;

21. The method of claim 7 or 8 or 16 or 17, wherein:

the format of the downlink control information for uplink scheduling is format 0.

22. The method of claim 4, 11 or 19, wherein:

the format of the downlink control information for downlink scheduling is format 1A.

23. A configuration system for measuring reference signals comprises a base station and a user terminal, wherein:

the user terminal is configured to send an aperiodic SRS at a resource indicated by the downlink control information after receiving the downlink control information;

wherein,