WO2012019412A1 - Configuration method and system for sounding reference signal - Google Patents

Abstract

A configuration method and system for Sounding Reference Signal (SRS) are provided, and the method and system enable the configuration for an aperiodic SRS and solve the problem that the aperiodic SRS can not sent by a use equipment (UE) dynamically and flexibly in prior art. The configuration method includes: a Base Station (BS) sending downlink control information to a user terminal, triggering the user terminal to send the aperiodic SRS through the downlink control information, and indicating the resources used by the user terminal to send the aperiodic SRS.

Description

 Configuration method and system for measuring reference signal

Technical field

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

 The uplink physical channel of the Long Term Evolution (LTE) system includes a Physical Random Access Channel (PRACH), a Physical Uplink Shared Channel (PUSCH), and a physical uplink. Control channel (Physical uplink control channel, abbreviated as PUCCH). The PUSCH has two different cyclic prefixes (Cyclic Prefix, CP for short), which are Normal Cyclic Prefix (Normal CP) and Extended Cyclic Prefix (Extended Cyclic Prefix). Each sub-frame of a PUSCH consists of two slots (Slots). For different cyclic prefix lengths, the position of the Demodulation Reference Signal (DMRS) in the subframe will not be located. Similarly, FIG. 1 is a schematic diagram of the time domain position of a prior art demodulation reference signal. As shown in FIG. 1, each subframe contains two DMRS symbols, where FIG. 1a is a schematic diagram of DMRS time domain positions when a normal cyclic prefix is used, and each subframe contains 14 orthogonal frequency division multiplexing (Orthogonal Frequency Division). Multiplexing (abbreviated as OFDM) symbols, including DMRS symbols, OFDM symbols represent the time domain position of one subframe, and Figure lb is a schematic diagram of the DMRS time domain position when the extended cyclic prefix is used. Each subframe contains 12 time domain data. OFDM symbol.

 In LTE, the physical downlink control channel PDCCH is used to carry uplink and downlink scheduling information, and uplink power control information. The base station (e-Node-B, referred to as eNB for short) can configure a user equipment (User Equipment, UE for short) through the downlink control information, or the user terminal accepts a higher layer configuration, which is also configured by high layer signaling. UE. The Downlink Control Information (DCI) format is divided into DCI formats 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, and so on. among them,

DCI format 0 is used to indicate a physical uplink shared channel (Physical uplink shared channel, Scheduling for short)

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

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

 DCI format 3, 3A is used for transmission of power control commands of physical uplink control channel (PUCCH) and PUSCH.

 The above DCI format 0, 1A, 3, 3A has the same transport block size, and DCI format 0, 1A is formatted by 1 bit.

 The DCI format for indicating the physical uplink shared channel scheduling includes a 5-bit modulation coding mode and redundancy version indication information, and the state of the 5-bit representation is as shown in Table 1. Table 1 Modulation, TBS index and redundancy version table for PUSCH Modulation coding mode index Modulation order Transport block size index Redundancy version

 Q' vidx

0 2 0 0

 1 2 1 0

 2 2 2 0

 3 2 3 0

 4 2 4 0

 5 2 5 0

 6 2 6 0

 7 2 7 0

 8 2 8 0

 9 2 9 0

 10 2 10 0

11 4 10 0 12 4 11 0

 13 4 12 0

14 4 13 0

15 4 14 0

16 4 15 0

17 4 16 0

18 4 17 0

19 4 18 0

20 4 19 0

21 6 19 0

22 6 20 0

23 6 21 0

24 6 22 0

25 6 23 0

26 6 24 0

27 6 25 0

28 6 26 0

29 1

30 reserved 2

31 3

The DCI format for indicating the physical downlink shared channel scheduling includes 5-bit modulation and coding mode indication information, and the state of the 5-bit representation is as shown in Table 2.

Modulation and TBS index table for PDSCH

26 6 24

26 6 24

 27 6 25

 28 6 26

 29 2

 30 4 reserved

 31 6

The broadcast information of the LTE system is divided into a MIB (Main Information Block) and a SIB (Scheduled Information Block), where the MIB is transmitted on the PBCH (Physical Broadcast Channel). Also known as SI, that is, Scheduled Information) is transmitted on the PDSCH.

 SRS is a signal used between a user terminal and a base station to measure Channel State Information (CSI). In the LTE system, the UE sends an uplink SRS on the last data symbol of the transmission subframe according to the bandwidth 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 and closed loop power control according to the obtained CSI.

 In the LTE system, the SRS sequence sent by the UE is obtained by cyclically shifting a root sequence » in the time domain. By performing different cyclic shifts on the same root sequence, different SRS sequences can be obtained, and The obtained SRS sequences are mutually orthogonal to each other, and therefore, these SRS sequences can be allocated to different UEs to implement code division multiple access between UEs. In the LTE system, the SRS sequence defines eight cyclic shifts α, given by the following formula (1): = 2π-^-

8 ... Formula (1)

Where n _RS is indicated by 3 bit signaling, which are 0, 1, 2, 3, 4, 5, 6, and 7, respectively. That is to say, in the same time-frequency resource, the UE in the cell has 8 available code resources, and the eNB can configure up to 8 UEs to simultaneously send the SRS 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 length of the SRS sequence 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 corresponds to a tree structure. The SRS bandwidth of the highest layer (or the first layer) (SRS-Bandwidth) corresponds to the maximum SRS bandwidth of the SRS bandwidth configuration, or SRS bandwidth. range. After calculating the SRS bandwidth of the base station according to the signaling indication of the base station, the UE determines the initial frequency domain position of the SRS according to the upper layer signaling frequency domain position “RRC” sent by the eNB. FIG. 2 is a prior art allocation different WRRC. Schematic diagram of the frequency domain initial position of the SRS transmitted by the UE. As shown in FIG. 2, the UEs allocated with different WRRCs will send SRS in different areas of the SRS bandwidth of the cell, where UE1 determines the initial frequency position of the SRS according to "^^=0". The UE2 determines the frequency initial position of the SRS to be transmitted according to _c =3, and the UE3 determines the frequency initial position of the SRS to be transmitted according to "^^=4, and the UE4 Wn^ _c =6 determines the initial frequency position at which the SRS is transmitted.

The sequence used by the SRS is selected from the demodulation pilot sequence group. When the SRS bandwidth of the UE is 4 Resource Blocks (RBs), it is generated by a computer with a length of 2 RBs (Computer Generated, referred to as A sequence of CG ); 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, in the same SRS bandwidth, the sub-carriers of the SRS are placed at intervals, that is, the SRS is transmitted using a comb structure, and the number of frequency combs in the LTE system is used. 2, which also corresponds to the time domain repeat coefficient value (Repetition Factor, RPF for short) is 2. 3 is a schematic diagram of a comb structure of a prior art SRS. As shown in FIG. 3, when each UE sends an SRS, only one of the two frequency combs is used, comb=0 or comb=l. Thus, the UE transmits the SRS using only the subcarriers whose frequency domain index is even or odd based on the frequency comb comb position indication of the 1-bit upper layer signaling. This comb structure allows more UEs to send SRS within the same SRS bandwidth.

Within the same SRS bandwidth, multiple UEs may use different cyclic shifts on the same frequency comb, and then send SRS through code division multiplexing, or two UEs may be combed on different frequencies and transmitted by frequency division multiplexing. SRS. For example, in an LTE system, a UE that transmits an SRS within a certain SRS bandwidth (4 RBs) can use 8 cyclic shifts and 2 frequency combs that can be used, so the UE has a total of 16 A resource that can be used to send SRS, that is, up to 16 SRSs can be sent simultaneously within this SRS bandwidth. Since the uplink single user is not supported in the LTE system Single User Multiple Input Multiple Output (SU-MI MO for short),

The UE can only transmit one SRS at each time, so one UE only needs one SRS resource. Therefore, within the above SRS bandwidth, the system can multiplex up to 16 UEs at the same time.

 The LTE-Advanced (LTE-A) system is the next-generation advanced system of the LTE system. It supports SU-MIM0 in the uplink and can use up to four antennas as uplink transmitting antennas. That is to say, the UE can simultaneously 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 LTE-A research, it is proposed that in uplink communication, non-pre-coded (ie, antenna-specific) SRS should be used, and PUSCH DMRS should be pre-coded. The base station can estimate the original CSI of the uplink by receiving the non-precoded SRS, and the pre-coded DMRS cannot make the base station estimate the original CSI of the uplink. At this time, when the UE transmits the non-precoded SRS by using multiple antennas, the SRS resources required by each UE are increased, which causes the number of UEs that can be simultaneously multiplexed in the system to decrease. How to properly design the SRS resource to implement SRS more efficiently and dynamically, and save signaling overhead is a problem to be solved. Summary of the invention

 An object of the present invention is to provide a method and a system for configuring a reference signal to implement a configuration of aperiodic SRS, so as to solve the problem that the UE cannot dynamically transmit aperiodic SRS dynamically.

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

 The base station sends downlink control information to the user terminal, and the downlink control information triggers the user terminal to send the aperiodic SRS, and instructs the user terminal to use the resource used in the aperiodic SRS.

 Preferably, the method further includes: after receiving the downlink control information, the user terminal enters a process of sending aperiodic SRS according to the trigger of the downlink control information and the resource indicated by the downlink control information.

Preferably, the method further includes: the user terminal, according to the resource indicated by the downlink control information, combined with the aperiodic SRS resource type information pre-configured by the high layer signaling, to learn to send the non- The resource used in the periodic SRS, the resource type information may include any one of the following information: cyclic shift information, frequency domain location information, user-specific SRS bandwidth information, and location information of the frequency comb.

 Preferably, the downlink control information is downlink control information used for downlink scheduling; and the step of triggering, by the downlink control information, the user terminal to send an aperiodic SRS, and instructing the user terminal to use a resource used in aperiodic SRS The method includes: the downlink control information used for downlink scheduling triggers the user terminal to send an aperiodic SRS, and indicates the resource used by the user terminal to send an aperiodic SRS; or, by using the downlink control information used for downlink scheduling The user terminal is triggered to send an aperiodic SRS when the downlink data is retransmitted, and the resource used by the user terminal to send the aperiodic SRS is instructed.

 Preferably, the step of triggering the user terminal to send the aperiodic SRS by using the downlink control information, and indicating the resource used by the user terminal to send the aperiodic SRS, includes: carrying the trigger bit and the resource indication information in the downlink control information, The trigger bit is used to trigger the user terminal to send an aperiodic SRS, and the resource indication information is used to indicate a resource used by the user terminal to send an aperiodic SRS. The trigger bit occupies one or more bits; the resource indication information occupies n bits, n is an integer and l n < 15.

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

 a 1-bit frequency hopping flag bit; a modulation coding mode and a usable bit of the redundancy version indication information, including: the modulation coding mode and the redundancy version indication information are higher or higher 2 bits or higher 3 bits or higher 4 bits or All bits; the available bits of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; resource block allocation and frequency hopping resource allocation information The available bits include: the source block allocation and the upper 2 bits or the upper 3 bits of the frequency hopping resource allocation information.

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

 The 1-bit frequency hopping flag bit; the available bits of the modulation coding mode and the redundancy version indication information corresponding to the transmission block, including: the modulation code mode and the redundancy version indication information are higher or higher 2 bits or higher 3 Bit or high 4 bits or all bits; available bits of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; resource block allocation And available bits of the frequency hopping resource allocation information, including: the resource block allocation and the upper 2 bits or the upper 3 bits of the frequency hopping resource allocation information; when only one transport block is enabled, the modulation code corresponding to the transport block is not enabled Instructions for the mode and redundancy version.

 Preferably, the resource indication information is implemented in one or more of the following manners: when the frequency hopping of the uplink PUSCH is not enabled and/or the uplink PUSCH does not use high-order modulation, the frequency hopping flag bit is used. / or modulation coding mode and redundancy version indication information any one or more bits of the available bits as resource indication information;

When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as the resource indication information, and the modulation and coding mode index i _{MCS is} indicated as 0 to 28 by the modulation and coding mode and the redundancy version indication information. Any of the k states in the middle to indicate aperiodic SRS resources, K k <29;

 When the uplink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode and the redundancy version indication information indicate the redundancy version, and the remaining 3 bits serve as resources. Indication information;

 When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication of the uplink demodulation reference signal is used to indicate any of the available bits. Or multiple bits as resource indication information;

 When the frequency hopping of the uplink PUSCH is not enabled and one of the following conditions is met: The number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or 2 or 4 cyclic shifts are used, and the frequency hopping flag is used. And the cyclic shift indication information of the uplink demodulation reference signal is any one or more bits of the available bits as resource indication information;

When the unit of the PUSCH resource allocation of the user terminal is 2 resource blocks (RBs), any one or more of the available bits of the resource block allocation and the frequency hopping resource allocation information are used as resource indication letters. Interest.

 Preferably, 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 uplink PUSCH does not use high-order modulation (64QAM), any one of the available bits of the frequency hopping flag or the modulation coding mode and the redundancy version indication information is used as a trigger. Bit

When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as trigger bits, and the modulation coding mode index/ _{MCS is} indicated as 0 to 28 by the modulation coding mode and the redundancy version indication information. Any one of the k states triggers the aperiodic SRS, K k <29; when the uplink transmitted data is retransmitted data, or the new data indicator bit (NDI) is 0, the 5-bit modulation coding mode is used And 2 bits in the redundancy version indication information indicate a redundancy version, and any one or more of the remaining 3 bits serve as a trigger bit;

 When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication of the uplink demodulation reference signal is used to indicate any of the available bits. As a trigger bit;

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

 Preferably, the downlink control information is downlink control information used for downlink scheduling, where the trigger bit is a newly added bit or any one or more of the following bits, and the resource indication information is the following bits. Any one or more of the 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 include: the modulation coding mode indicates the upper 1 bit or the upper 2 bits or the upper 3 bits or the upper 4 bits or all bits of the information; the 2-bit redundancy version bit; the 1-bit centralized type / distributed VRB allocation flag; available bits of resource block allocation information, including: the upper 2 bits or the upper 3 bits of the resource block allocation information.

 Preferably, the resource indication information is implemented in one or more of the following manners: when the restricted retransmission combining mode is tracking merge, or when the number of available redundancy versions is 1 or 2, the redundancy version is used. Any one or more of the bits as resource indication information;

When the virtual resource block (VRB) allocation is fixed, centralized or distributed, or PDSCH does not fail. When using high-order modulation, using the centralized/distributed VRB allocation flag and/or modulation coding mode to indicate any one or more bits of the information available information as resource indication information;

When the downlink transport block is a retransmission transport block, the modulation and coding mode indication information is used as the resource indication information, and the modulation and coding mode indication information is used to indicate the modulation coding mode index/ _MCS to any of the k states in the range of 0 to 28. One to indicate aperiodic SRS resources, lk 29;

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

 When the redundancy version is fixed to one or two, 1 bit or 2 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 more bits of the resource block allocation information available bits are used as the resource indication information.

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

 When the retransmission merge mode is restricted to track merge, or when the number of available redundancy versions is 1 or 2, any one of the redundancy version bits is used as the trigger bit;

 When the VRB allocation is fixed or centralized, or the PDSCH does not use high-order modulation, the centralized/distributed VRB allocation flag or modulation coding mode is used to indicate any one of the available bits of the information as a trigger bit;

When the uplink transport block is a retransmission transport block, the modulation and coding mode indication information is used as a trigger bit, and the modulation and coding mode indication information is used to indicate the modulation coding mode index/ _MCS as any one of the k states of 0 to 28. To trigger aperiodic SRS, 1 < k <29;

 When the downlink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode indication information indicate the redundancy version, and any of the remaining 3 bits or Multiple bits as trigger bits;

 When the redundancy version is fixed to one or two, use 1 bit or 2 bits in the redundancy version as the trigger bit;

When the unit of the 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 the trigger bit. Preferably, the step of triggering the user terminal to send the aperiodic SRS by using the downlink control information, and indicating the resource used by the user terminal to send the aperiodic SRS includes: triggering the aperiodic SRS and indicating the resource in the downlink control information The joint indication information is used to trigger the user terminal to send the aperiodic SRS, and simultaneously instruct the user terminal to use the resource used in the aperiodic SRS. The joint indication information occupies m bits, where m is an integer and 2 < m < 15.

 Preferably, the downlink control information is downlink control information used for uplink scheduling, and the joint indication information is any one or more of the following bits: a 1-bit frequency hopping identifier; a modulation and coding mode and redundancy The available bits of the version indication information, including: the high-order bit or the high-order 2 bits or the high-order 3 bits or the high-order 4 bits or all bits of the modulation coding mode and the redundancy version indication information; a cyclic shift indication of the uplink demodulation reference signal The available bits of the information include: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; available bits of the resource block allocation and the frequency hopping resource allocation information, including: the resource block allocation and the frequency hopping resource The upper 2 or higher 3 bits of the allocation information.

 Preferably, the downlink control information is downlink control information for indicating uplink multi-antenna transmission, and the joint indication information is any one or more of the following bits: a 1-bit frequency hopping identifier; enabling transmission The available coding bits of the block corresponding to the modulation coding mode and the redundancy version indication information, including: the modulation coding mode and the redundancy version indication information are higher 1 bit or higher 2 bits or higher 3 bits or higher 4 bits or all bits; The available bits of the cyclic shift indication information of the demodulation reference signal include: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; available bits of the resource block allocation and the frequency hopping resource allocation information, including : The upper 2 bits or the upper 3 bits of the resource block allocation and the frequency hopping resource allocation information. When only one transport block is enabled, the modulation coding mode and the redundancy version indication information corresponding to the transport block are not enabled.

 Preferably, the joint indication information is implemented in one or more of the following manners: when the frequency hopping of the uplink PUSCH is not enabled and/or the uplink PUSCH does not use high-order modulation, the frequency hopping flag is used. One or more bits of the modulation coding mode and the redundancy version indication information available bits are used as joint indication information, or only one or more bits of the modulation coding mode and the redundancy version indication information available bits are used as joint indication information;

When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as joint indication information, and the modulation and coding mode and the redundancy version indication information are modulated and coded. The mode index / _MCS indication is any one of the k states of 0 to 28 to indicate the aperiodic SRS resource, K k <29;

 When the uplink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode and the redundancy version indication information indicate the redundancy version, and the remaining 3 bits are combined. Indication information;

 When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication of the uplink demodulation reference signal is used to either or any of the available bits. Multiple bits as joint indication information;

 When the frequency hopping of the uplink PUSCH is not enabled and is satisfied: When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed frequency is 2 or 4 cyclic shifts, the frequency hopping flag and the uplink solution are used. Adjusting, by the cyclic shift indication information of the reference signal, any one or more bits of the available bits of the information as joint indication information;

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

 Preferably, the downlink control information is downlink control information used for downlink scheduling, and the joint indication information is any one or more of the following bits:

 The available bits of the modulation coding mode indication information include: the modulation coding mode indicates the upper 1 bit or the upper 2 bits or the upper 3 bits or the upper 3 bits or all bits of the information; the 2-bit redundancy version bit; the 1-bit centralized type / distributed VRB allocation flag; available bits of resource block allocation information, including: the upper 2 bits or the upper 3 bits of the resource block allocation information.

 Preferably, the joint indication information is implemented in one or more of the following manners: when the restricted retransmission merge mode is tracking merge, or when the number of available redundancy versions is 1 or 2, the redundancy version is used. Any one or more of the bits as joint indication information;

 When the virtual resource block (VRB) allocation is fixed or centralized, or the PDSCH does not use high-order modulation, the centralized/distributed VRB allocation flag and the modulation coding mode indicate any of the available bits of information. Or multiple bits are used as joint indication information, or only one or more bits of the information available bits are indicated by the modulation coding mode as joint indication information;

When the downlink transport block is a retransmission transport block, the modulation coding mode indication information is used as a joint finger. And indicating, by the modulation and coding mode indication information, the modulation coding mode index/ _MCS indication as any one of 0 to 28 to indicate the aperiodic SRS resource;

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

 When the redundancy version is fixed to one type, the 2-bit redundancy version bit is used as the joint indication information; when the unit of the PDSCH resource allocation of the user terminal is 2 resource blocks, the resource block allocation information is used in any of the available bits. One or more of them as joint instructions.

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

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

 In order to solve the above technical problem, the present invention also provides a configuration system for measuring a reference signal, including a base station and a user terminal, where:

 The base station is configured to send downlink control information to the user terminal, and the downlink control information is used to trigger the user terminal to send an aperiodic SRS, and instruct the user terminal to use a resource used in aperiodic SRS;

 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.

The aperiodic SRS configuration method of the present invention can implement the terminal to send aperiodic SRS, improve the utilization of SRS resources, and improve the flexibility of resource scheduling. BRIEF abstract

 Figure la and Figure 1b are schematic diagrams of time domain positions of a prior art demodulation reference signal;

 2 is a schematic diagram of a frequency domain initial position of a prior art SRS for transmitting SRSs according to the prior art; FIG. 3 is a schematic diagram of a comb structure of a prior art SRS;

4 is a schematic structural diagram of a configuration system of a non-periodic SRS of the present invention. Preferred embodiment of the invention

 In addition to the periodic transmission of the SRS in the LTE, in order to improve the utilization rate of the SRS resource and improve the flexibility of the resource scheduling, the UE may also configure the UE to transmit the SRS aperiodicly through the downlink control information.

 The inventive concept is: The base station sends downlink control information to the user terminal, and the downlink control information triggers the user terminal to send an aperiodic SRS, and instructs the user terminal to use the resource used in the non-periodic SRS.

 The foregoing configuration method enables the UE to dynamically and flexibly transmit the SRS periodically, thereby improving the utilization of the SRS resource.

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

 Preferably, the user terminal can learn the specific resource for sending the aperiodic SRS according to the resource indicated by the downlink control information and the aperiodic SRS resource type information pre-configured by the high layer signaling. The resource type information includes any one of the following information: cyclic shift information, frequency domain location information, user-specific SRS bandwidth information, and frequency comb location information.

 Preferably, the downlink control information is downlink control information for downlink scheduling, and the downlink control information for downlink scheduling triggers the user terminal to send an aperiodic SRS, and instructs the user terminal to use when sending an aperiodic SRS. The downlink control information used for downlink scheduling triggers the user terminal to send an aperiodic SRS when the downlink data is retransmitted, and instructs the user terminal to use the resource used in the aperiodic SRS.

 The downlink control information is used to trigger the user terminal to send an aperiodic SRS, and the resource used by the user terminal to send the aperiodic SRS is implemented in the following two preferred implementation manners:

 Manner 1: The downlink control information carries a trigger bit and resource indication information, where the trigger bit is used to trigger the user terminal to send an aperiodic SRS, and the resource indication information is used to instruct the user terminal to send an aperiodic SRS. The resources used at the time.

 Preferably, the trigger bit occupies 1 or more bits; the resource indication information occupies n bits, n is an integer and l n < 15.

• When the base station triggers through the downlink control information for uplink scheduling and instructs the user terminal to perform non- When transmitting the periodic SRS, any one or more of the following bits may be selected or the newly added bit may be used as the trigger bit, and any one or more of the following bits may be selected as the resource indication information, and the selection is required. Ensure that the trigger bit does not conflict with the bits used by the resource indication information:

 a 1-bit hopping flag; a modulation and coding scheme and a redundancy version (Modulation and coding scheme and redundancy version) indicating information available bits, including: the modulation coding mode and the upper 1 bit of the redundancy version indication information Or a high 2 bit or a high 3 bit or a high 4 bit or all bits; an available bit of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit in the cyclic shift indication information of the uplink demodulation reference signal Or 2 bits; resource block allocation and available bits of the resource block assignment and hopping resource allocation information, including: the resource block allocation and the frequency of the frequency hopping resource allocation information are 2 or 3 Bit.

 specifically:

 When the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not use high-order modulation (64QAM), any of the available bits of the frequency hopping flag and/or the modulation coding mode and the redundancy version indication information may be used or Multiple bits are used as resource indication information to indicate the resources for transmitting the aperiodic SRS. Similarly, when the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not use high-order modulation (64QAM), any one of the frequency-hopping flag or the modulation coding mode and the redundancy version indication information available bits may be used. The trigger bit is used to trigger the transmission of the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit.

When the uplink transport block is a retransmission transport block, the modulation and coding mode and the redundancy version indication information are used as the resource indication information, and the modulation and coding mode index/ _{MCS is} indicated as 0 to 28 by using the modulation and coding mode and the redundancy version indication information. Any of the k states in the middle indicates a non-periodic SRS resource, lk 29. Similarly, when the uplink transport block is a retransmission transport block, the modulation and coding mode and the redundancy version indication information are used as the trigger bits, and the modulation and coding mode index/ _{MCS is} indicated as 0 by the modulation and coding mode and the redundancy version indication information. to

Any of the k states in 28 triggers the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit. When the uplink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, The 2-bit modulation coding mode and the 2 bits in the redundancy version indication information indicate the redundancy version, and the remaining 3 bits serve as resource indication information. Similarly, when the uplink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode and the redundancy version indication information indicate the redundancy version, and the remaining 3 Any one or more of the bits are used as trigger bits. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit.

 When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, any of the available bits of the cyclic shift indication information of the uplink demodulation reference signal may be used. One or more bits are used as resource indication information to indicate the resource for transmitting the aperiodic SRS. Similarly, when the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication information of the uplink demodulation reference signal can be used in the available bits. Any bit of the bit acts as a trigger bit to trigger the transmission of the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict 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 met: The number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or 2 or 4 cyclic shifts are fixed, and the frequency hopping flag is used. And the cyclic shift indication information of the uplink demodulation reference signal is any one or more bits of the available bits as resource indication information.

 When the unit of the PUSCH resource allocation of the user terminal is 2 RBs (Resource Blocks), any one or more of the available bits of the resource block allocation and the frequency hopping resource allocation information may be used as the resource indication information to indicate the transmission. Acyclic SRS resources. Similarly, when the unit of PUSCH resource allocation of the user terminal is 2 RBs, any one of the available bits of the resource block allocation and the frequency hopping resource allocation information may be used as a trigger bit to trigger the transmission of the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit.

 The above several methods can be used in combination without conflict.

Preferably, when the downlink control information used for uplink scheduling is used to indicate uplink multi-antenna transmission, in addition to the optional bits, when only one transport block is enabled, the transport block may be never enabled. Selecting bits in the corresponding modulation coding mode and indication information of the redundancy version (for example, 5 bits) As a trigger bit and / or as a resource indication information. The format of the downlink control information at this time is called: a downlink control information format for indicating uplink multi-antenna transmission.

• When the base station triggers and indicates to the user terminal to transmit the aperiodic SRS through the downlink control information for downlink scheduling, any bit or multiple bits of the following bits may be used or the newly added bit may be used as the trigger bit, and Any one or more of the following bits are used as the resource indication information, and it is necessary to ensure that the trigger bit does not conflict with the bit used by the resource indication information:

 The modulation and coding scheme indicates the available bits of the information, including: the modulation coding mode indicates the upper 1 bit or the upper 2 bits or the upper 3 bits or the upper 4 bits or all bits of the information; the 2-bit redundancy version bit 1 bit of centralized/distributed VRB assignment flag; available bits of resource, block, and resource block assignment information, including: the upper 2 bits of the resource block allocation information or High 3 digits.

 specifically:

 When the retransmission combining mode is CC (Chase Combining) merge, or when the number of available redundancy versions is 1 or 2, any one or more of the redundancy version bits may be used as the resource indication information. To indicate the resources that send aperiodic SRS. Similarly, when the retransmission combining mode is CC merge, or when the number of available redundancy versions is 1 or 2, any one of the redundancy version bits can be used as a trigger bit to trigger the transmission of the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bit bits used by the trigger bit.

When the VRB (Virtual Resource Block) allocation is fixed or centralized, or the PDSCH does not use high-order modulation (64QAM), the centralized/distributed VRB can be used. / or Modulation and coding scheme indicates any one or more bits of the information available information as resource indication information to indicate the resource for transmitting the aperiodic SRS. Similarly, when the VRB allocation is fixed or distributed, or the PDSCH does not use high-order modulation, the centralized/distributed VRB allocation flag or modulation coding mode may be used to indicate any bit of the information available bits. The trigger bit triggers the transmission of the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit. When the downlink transport block is a retransmitted transport block, modulation and coding scheme used as the indication information indicating the resource information by said information indicating the modulation and coding scheme index I _MCS modulation and coding scheme indicated in any of k states 0-28 in One to indicate aperiodic SRS resources, 1 k 29. Similarly, when the uplink transport block is a retransmission transport block, the modulation and coding mode indication information is used as a trigger bit, and the modulation and coding mode indication information is used to indicate the modulation coding mode index/ _MCS to be in the k state of 0 to 28 Any of them to trigger an aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit.

 When the downlink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode indication information indicate the redundancy version, and the remaining 3 bits serve as the resource indication information. Similarly, when the downlink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode indication information indicate the redundancy version, and any of the remaining 3 bits One or more bits are used as trigger bits. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bit bits used by the trigger bit.

 When the redundancy version is fixed to one or two, 1 bit or 2 bits in the redundancy version is used as the resource indication information. Similarly, when the redundancy version is fixed to one or two, 1 bit or 2 bits in the redundancy version is used as the trigger bit. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit.

 > When the unit of PDSCH resource allocation of the user terminal is 2 RBs (Resource Block), any one or more of the available bits of the resource block allocation information may be used as resource indication information to indicate the resource for transmitting the aperiodic SRS. Similarly, when the unit of the PDSCH resource allocation of the user terminal is 2 RBs, any one of the available bits of the resource block allocation information can be used as a trigger bit to trigger the transmission of the aperiodic SRS. However, it is necessary to ensure that the bits used by the resource indication information do not conflict with the bits used by the trigger bit. Preferably, the format of the downlink control information used for uplink scheduling is format 0; and the format of downlink control information used for downlink scheduling is format 1A.

Manner 2: The downlink control information carries a triggering aperiodic SRS and indicating a resource association. In combination with the indication information, the joint indication information is used to trigger the user terminal to send an aperiodic SRS, and simultaneously instruct the user terminal to use a resource used in aperiodic SRS. That is, the joint indication information has the function 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 indicates to the user terminal to transmit the aperiodic SRS through the downlink control information for uplink scheduling, any of the following bits may be used as the joint indication information:

 a 1-bit hopping flag; a modulation and coding scheme and a redundancy version (Modulation and coding scheme and redundancy version) indicating information available bits, including: the modulation coding mode and the upper 1 bit of the redundancy version indication information Or a high 2 bit or a high 3 bit or a high 4 bit or all bits; an available bit of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit in the cyclic shift indication information of the uplink demodulation reference signal Or 2 bits; resource block allocation and available bits of the resource block assignment and hopping resource allocation information, including: the resource block allocation and the frequency of the frequency hopping resource allocation information are 2 or 3 Bit.

 specifically:

When the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH does not use high-order modulation (64QAM), the frequency hopping flag and the modulation coding mode and the redundancy version indication information may be used as a joint of any number of bits. The indication information indicates the resource for transmitting the aperiodic SRS, or only the modulation coding mode and the redundancy version indication information any number of bits are used as the joint indication information to indicate the resource for transmitting the aperiodic SRS. When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as the joint indication information, and the modulation and coding mode index/ _{MCS is} indicated as 0 to 28 by the modulation and coding mode and the redundancy version indication information. Any of the k states in the middle indicates aperiodic SRS resources, lk 29.

 When the uplink transmission data is retransmitted data, or the new data indication bit (NDI) is 0, the 2 bits in the 5-bit modulation coding mode and the redundancy version indication information indicate the redundancy version, and the remaining 3 bits are combined. Instructions.

When the uplink demodulation reference signal has a cyclic shift available, the number is 2 or 4, or 2 fixed. Or 4 cyclic shifts, the cyclic shift indication information of the uplink demodulation reference signal may be used as any joint indication information to indicate the resource for transmitting the aperiodic SRS.

 When the frequency hopping of the uplink PUSCH is not enabled and one of the following conditions is met: The number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or 2 or 4 cyclic shifts are fixed, and the frequency hopping flag is used. And the cyclic shift indication information of the uplink demodulation reference signal uses any one of the bits as the joint indication information.

 When the unit of the PUSCH resource allocation of the user terminal is 2 RBs (Resource Block), any resource of the resource block allocation and the frequency hopping resource allocation information available bits may be used as the joint indication information to indicate the resource for transmitting the aperiodic SRS. .

 Preferably, when the downlink control information used for uplink scheduling is used to indicate uplink multi-antenna transmission, in addition to the above-mentioned optional bits, when only one transport block is enabled, the transmission may be never enabled. The bit corresponding to the modulation coding mode and the redundancy version (5 bits) of the block is selected as the joint indication information. The downlink control information format at this time is called: a downlink control information format for indicating uplink multi-antenna transmission.

• When the base station triggers through the downlink control information for downlink scheduling and instructs the user terminal to transmit the aperiodic SRS, any of the following bits may be used as the joint indication information:

 The modulation and coding scheme indicates the available bits of the information, including: the modulation coding mode indicates the upper 1 bit or the upper 2 bits or the upper 3 bits or the upper 4 bits or all bits of the information; the 2-bit redundancy version bit 1 bit of centralized/distributed VRB assignment flag; available bits of resource, block, and resource block assignment information, including: 2 or higher of resource block allocation information 3 digits.

 specifically:

 When the retransmission combining mode is CC (Chase Combining) merge, or when the number of available redundancy versions is 1 or 2, any multiple bits in the redundancy version bits may be used as joint indication information to indicate Send resources for aperiodic SRS.

> When VRB (Virtual Resource Block) allocation is fixed and centralized Or distributed, or when the PDSCH does not use high-order modulation (64QAM), the centralized/distributed VRB allocation flag and Modulation and coding scheme may be used to indicate any number of bits in the information available as a joint. The indication information indicates the resource for transmitting the aperiodic SRS, or the modulation coding mode is used to indicate any of the information available bits as the joint indication information to indicate the resource for transmitting the aperiodic SRS.

When the downlink transport block is a retransmission transport block, the modulation and coding mode indication information is used as the joint indication information, and the modulation and coding mode indication information is indicated by the modulation and coding mode index i _MCS as any one of 0 to 28 to indicate the non- Periodic SRS resources.

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

 When the redundancy version is fixed to one, the 2-bit redundancy version bit is used as the joint indication information.

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

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

A configuration system for implementing the above method, as shown in FIG. 4, includes a base station and a user terminal (one or more), wherein:

 The base station is configured to send downlink control information to the user terminal, and the downlink control information is used to trigger the user terminal to send an aperiodic SRS, and instruct the user terminal to use a resource used in aperiodic SRS;

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. Embodiment 1

 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

 In this embodiment, the downlink control information is downlink control information used for uplink single antenna transmission, and the format is format 0.

 The base station can agree with the user terminal:

 When the frequency hopping of the uplink PUSCH is not enabled and/or the PUSCH cannot be used for high-order modulation (64QAM), any of the following methods may be used to trigger the transmission of the aperiodic SRS and the resources indicating the aperiodic SRS:

 1) 1 bit hopping flag bit and 1 bit modulation coding mode and redundancy version high bit

2 bits are used as triggering aperiodic SRS and joint indication information indicating resources;

 2) using a 1-bit frequency hopping flag bit as a trigger bit, and modulating the coding mode and the upper 1 or higher 2 bits of the redundancy version as resource indication information;

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

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

 5) The trigger bit is a new 1 bit, and the frequency hopping flag and/or modulation coding mode and the upper 1 or higher 2 bits of the redundancy version are used as resource indication information;

 When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or 2 or 4 cyclic shifts are fixed, any of the following methods may be used to trigger the transmission of the aperiodic SRS and the indication. Acyclic SRS resources:

 1) using 2 bits in the cyclic shift indication information of the uplink demodulation reference signal as the trigger aperiodic SRS and the joint indication information indicating the resource;

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

When the frequency hopping of the uplink PUSCH is not enabled and the following conditions are met: Uplink demodulation reference signal The number of cyclic shifts available is 2 or 4, or 2 or 4 cyclic shifts are fixed, and 1 or 2 bits of the frequency hopping flag and the uplink demodulation reference signal cyclic shift indication information can be used as resources. Instructions.

 The above conventions can exist at the same time as long as no conflicts occur.

Embodiment 2

 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

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

 The base station can agree with the user terminal:

 When the number of cyclic shifts of the uplink demodulation reference signal is 2, or 2 cycles are fixed, the transmission of the aperiodic SRS and the resource indicating the aperiodic SRS may be triggered by any of the following methods. :

 1) using the 2 bits of the cyclic shift indication information of the uplink demodulation reference signal as the trigger aperiodic

SRS and joint indication information indicating resources;

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

 When the PUSCH cannot use high-order modulation (64QAM), the following methods can be used to trigger the transmission of the aperiodic SRS and the resources indicating the aperiodic SRS: the new 1 bit is used as the trigger bit, and the modulation coding mode and redundancy are used. The upper 1 bit of the version indication information is used as the resource indication information;

 When only one transport block is enabled, any of the following methods can be used to trigger the transmission of the aperiodic SRS and the resources indicating the aperiodic SRS:

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

2) A plurality of bits in the modulation coding mode and the redundancy version of the indication information corresponding to the transport block are not used as the trigger aperiodic SRS and the joint indication information indicating the resource. The above conventions can exist at the same time as long as no conflicts occur.

Embodiment 3

 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

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

 The base station can agree with the user terminal:

 When the RV version is fixed to 00, or when the retransmission combining mode is CC merge, or when the transmitted data is new data, or the new data indicating bit NDI is 1, any of the following methods may be used to trigger the non- The transmission of the periodic SRS and the resources indicating the aperiodic SRS:

 1) using the new 1 bit as the trigger bit and the 2 bit redundancy version bit as the resource indication information;

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

 3) using a 2-bit redundancy version bit as a joint indication information for triggering the aperiodic SRS and indicating the resource;

 When the VRB allocation is centralized or distributed, and the PUSCH cannot use high-order modulation (64QAM), any of the following methods may be used to trigger the transmission of the aperiodic SRS and the resources indicating the aperiodic SRS. :

 1) The 1-bit centralized/distributed VRB allocation flag is used as the trigger bit, and the upper 1 bit of the modulation coding mode is used as the resource indication information; the upper 1 bit of the information is composed of 2 bits as the trigger aperiodic SRS and the indication resource. Joint instructions.

 The above conventions can exist at the same time as long as no conflicts occur.

Embodiment 4 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

 In this embodiment, the downlink control information is downlink control information used for downlink scheduling, and the format is format 1A. The aperiodic SRS is triggered only when the downlink data is retransmitted (NDI=0).

 The base station can agree with the user terminal:

 When NDI=0 and the retransmission combining mode is CC combining, any of the following methods may be used to trigger the sending of the aperiodic SRS and the resources indicating the aperiodic SRS:

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

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

 When NDI=0 and the VRB allocation is fixed or centralized, and the PUSCH cannot use high-order modulation (64QAM), any of the following methods may be used to trigger the transmission of the aperiodic SRS and indicate non- Periodic SRS resources:

 1) The 1-bit centralized/distributed VRB allocation flag is used as the trigger bit, and the upper 1 bit of the modulation coding mode is used as the resource indication information; the upper 1 bit of the information is composed of 2 bits as the trigger aperiodic SRS and the indication resource. Joint instructions.

 3) The trigger bit is a new one bit, and the high-order 1 bit of the modulation coding mode indication information and the centralized/distributed VRB allocation flag bit of 1 bit are used as the resource indication information.

 4) The trigger bit is a new 1 bit, and the 3 bits in the modulation coding mode indication information are used as the resource indication information.

 The above conventions can exist at the same time as long as no conflicts occur.

Embodiment 5

The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information. In this embodiment, the downlink control information is downlink control information used for uplink scheduling. The base station can agree with the user terminal:

 When the unit of the PUSCH resource allocation for the user terminal is 2 RBs, any one of the following methods may be used to trigger the transmission of the aperiodic SRS and the resource indicating the aperiodic SRS: 1) The bit is used as a trigger bit, and the high 2 bits or the upper 3 bits in the resource block allocation and the frequency hopping resource allocation information are used as the resource indication information;

 2) The high 2 bits or the high 3 bits in the resource block allocation and the frequency hopping resource allocation information are used as the joint indication information for triggering the non-periodic SRS and indicating the resource.

Embodiment 6

 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

 In this embodiment, the downlink control information is downlink control information used for downlink scheduling. The base station can agree with the user terminal:

 When the unit for PDSCH resource allocation for the user terminal is 2 RBs, any of the following methods may be used to trigger the transmission of the aperiodic SRS and the resources indicating the aperiodic SRS:

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

 2) Use the upper 2 bits or the upper 3 bits in the resource block allocation information as the joint indication information.

Example 7

 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

 In this embodiment, the downlink control information is downlink control information used for uplink scheduling. The base station can agree with the user terminal:

When the uplink transport block is a modulation coding mode of the retransmission transport block and the redundancy version indication information Modulation coding mode index / _MCS is 0 to 28:

1) using the newly added 1 bit as the trigger bit, using the modulation and coding mode and the redundancy version indication information as the resource indication information, and indicating the modulation and coding mode index i _MCS to 0 through the modulation and coding mode and the redundancy version indication information. Any of the k states in 28 to indicate aperiodic SRS resources, K k <29;

2) using modulation coding mode indication information as joint indication information, indicating that the modulation coding mode index/ _{MCS is} indicated as any one of k states in 0 to 28 by the modulation coding mode and the redundancy version indication information Periodic SRS resources, lk 29.

 When the uplink transmission data is retransmitted data, or the new data indication bit NDI is 0, the 2 bits in the 5-bit modulation coding mode and the redundancy version indication information indicate the redundancy version, and the remaining 3 bits are used to trigger the user. The terminal sends the aperiodic SRS and the aperiodic SRS resource used by the user terminal, or only the user terminal to send the aperiodic SRS, or only the aperiodic SRS resource used by the user terminal.

Example eight

 The base station triggers the user terminal to send the aperiodic SRS by using the downlink control information, and instructs the user terminal to select the aperiodic SRS by using the downlink control information.

 In this embodiment, the downlink control information is downlink control information used for downlink scheduling. The base station can agree with the user terminal:

When the downlink transmission block is a modulation coding mode indication information indicating that the retransmission transmission block indicates that the modulation coding mode index / _MCS is 0 to 28:

1) using the newly added 1 bit as a trigger bit, using modulation coding mode indication information as resource indication information, and indicating the modulation coding mode index J _MCS as k in 0 to 28 by the modulation coding mode and the redundancy version indication information. Any of a variety of states to indicate aperiodic SRS resources, 1 k 29; or

2) using modulation coding mode indication information as joint indication information, indicating that the modulation coding mode index/ _{MCS is} indicated as any one of k states in 0 to 28 by the modulation coding mode and the redundancy version indication information Periodic SRS resources, lk 29. When the redundancy version is fixed to one or two, the 1 or 2 bits in the redundancy version are used to trigger the user terminal to send the aperiodic SRS and the aperiodic SRS resource used by the user terminal, or only the user terminal is sent to send the non-period. Periodic SRS, or only aperiodic SRS resources used by the user terminal.

 When the downlink transmission data is retransmitted data, or the new data indication bit NDI is 0, the 2-bit modulation coding mode indicates that the 2-bit indicates the modulation mode, and the remaining 3 bits are used to trigger the user terminal to send the aperiodic SRS. And indicating the aperiodic SRS resource used by the user terminal, or only triggering the user terminal to send the aperiodic SRS, or only indicating the aperiodic SRS resource used by the user terminal.

The above embodiments are merely examples, and the embodiments may be used in combination without conflict. Due to the combination of more methods, the text is no longer - enumerated.

 What is the resource type of the pre-configured aperiodic SRS, regardless of whether the mode is used or not, and which bits are used. The resource type is only related to the resource information (resource indication information or the joint indication information that triggers the aperiodic SRS and indicates the resource). For example, the resource type information indicates that the resource type is a frequency domain location, and the information carried in the resource information indicates a specific frequency domain location. For example, if the aperiodic SRS resource type is cyclically shifted and the four cyclic shifts that are optional for sending the aperiodic SRS are configured in advance, the resource information in the downlink control information may be further configured to be sent by using the resource information in the downlink control information. The cyclic shift used by the periodic SRS is which of the four cyclic shifts.

 Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed 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. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Industrial applicability

 Compared with the prior art, the present invention can implement the terminal to send aperiodic SRS, improve the utilization of SRS resources, and improve the flexibility of resource scheduling.

Claims

Claim  1. A method for configuring a reference signal, comprising:  The base station sends downlink control information to the user terminal, and the downlink control information triggers the user terminal to send the aperiodic measurement reference signal SRS, and instructs the user terminal to use the resource used in the aperiodic SRS.  2. The method of claim 1 further comprising:  After receiving the downlink control information, the user terminal enters a process of sending an aperiodic SRS according to the trigger of the downlink control information and the resource indicated by the downlink control information.  3. The method of claim 1 or 2, further comprising:  The user terminal learns, according to the resource indicated by the downlink control information, the resource used in the sending of the aperiodic SRS according to the aperiodic SRS resource type information pre-configured by the high layer signaling, where the resource type information includes the following information. Any of the following: cyclic shift information, frequency domain location information, user-specific SRS bandwidth information, and frequency comb location information.  4. The method of claim 1, wherein  The downlink control information is downlink control information used for downlink scheduling;  The step of triggering, by the downlink control information, the user terminal to send an aperiodic SRS, and instructing the user terminal to use the resource used in the aperiodic SRS, includes:  And the downlink control information used for the downlink scheduling is used to trigger the user terminal to send the aperiodic SRS, and the resource used by the user terminal to send the aperiodic SRS is sent; or the downlink control information used for the downlink scheduling is When the downlink data is retransmitted, the user terminal is triggered to send an aperiodic SRS, and the resource used by the user terminal to send the aperiodic SRS is instructed.  5. The method of claim 1, wherein  The step of triggering, by the downlink control information, the user terminal to send an aperiodic SRS, and instructing the user terminal to use the resource used in the aperiodic SRS, includes: The downlink control information carries a trigger bit and resource indication information, and the trigger bit is used to trigger the user terminal to send an aperiodic SRS, and the resource indication information is used to indicate a resource used by the user terminal to send an aperiodic SRS. 6. The method of claim 5, wherein  The trigger bit occupies one or more bits; the resource indication information occupies n bits, n is an integer and 1 n < 15.  7. The method of claim 5, wherein  The downlink control information is downlink control information used for uplink scheduling, where the trigger bit is a newly added bit or any one or more of the following bits, and the resource indication information is any of the following bits. One or more bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:  a 1-bit frequency hopping flag; a modulation coding mode and an available bit of the redundancy version indication information, including: the modulation coding mode and the redundancy version indication information are higher 1 bit or higher 2 bits or higher 3 bits or higher 4 bits Or all bits; the available bits of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; resource block allocation and frequency hopping resources The available bits of the allocation information include: the upper 2 bits or the upper 3 bits of the resource block allocation and the frequency hopping resource allocation information.  8. The method of claim 5, wherein  The downlink control information is downlink control information for indicating uplink multi-antenna transmission, where the trigger bit is a newly added bit or any one or more of the following bits, and the resource indication information is the following bits. Any one or more of the bits, and the bit used by the resource indication information does not conflict with the bit used by the trigger bit:  The 1-bit frequency hopping flag bit; the available bits of the modulation coding mode and the redundancy version indication information corresponding to the transmission block, including: the modulation code mode and the redundancy version indication information are higher or higher 2 bits or higher 3 Bit or high 4 bits or all bits; the available bits of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; The available bits of the allocation and frequency hopping resource allocation information include: the upper 2 bits or the upper 3 bits of the resource block allocation and the frequency hopping resource allocation information; when only one transport block is enabled, the corresponding corresponding to the transport block is not enabled. Modulation coding mode and indication of redundancy version.  9. The method according to claim 7 or 8, wherein The resource indication information is implemented in one or more of the following ways: When the frequency hopping of the uplink physical uplink shared channel PUSCH is not enabled and/or the uplink PUSCH does not use high-order modulation, the frequency hopping flag and/or the modulation coding mode and the redundancy version indication information available bits are used. One or more bits as resource indication information; When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as the resource indication information, and the modulation and coding mode index i _{MCS is} indicated as 0 to 28 by the modulation and coding mode and the redundancy version indication information. Any of the k states in the middle to indicate aperiodic SRS resources, K k <29;  When the uplink transmission data is retransmitted data, or the new data indication bit NDI is 0, the 2 bits in the 5-bit modulation coding mode and the redundancy version indication information indicate the redundancy version, and the remaining 3 bits are used as the resource indication information. ;  When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication of the uplink demodulation reference signal is used to indicate any of the available bits. Or multiple bits as resource indication information;  When the frequency hopping of the uplink PUSCH is not enabled and is satisfied: when the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed frequency is 2 or 4 cyclic shifts, the frequency hopping flag and the uplink solution are used. Adjusting, by the cyclic shift indication information of the reference signal, any one or more bits of the available bits as resource indication information;  When the unit of the PUSCH resource allocation of the user terminal is 2 resource block RBs, any one or more of the available bits of the resource block allocation and the frequency hopping resource allocation information are used as the resource indication information.  10. The method according to claim 7 or 8, wherein  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 uplink PUSCH does not use high-order modulation (64QAM), any one of the available bits of the frequency hopping flag or the modulation coding mode and the redundancy version indication information is used as a trigger. Bit When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as trigger bits, and the modulation coding mode index/ _{MCS is} indicated as 0 to 28 by the modulation coding mode and the redundancy version indication information. Any one of the k states triggers the aperiodic SRS, K k <29; when the uplink transmitted data is retransmitted data, or NDI is 0, the 5-bit modulation code is used 2 bits in the mode and redundancy version indication information indicate a redundancy version, and any one or more of the remaining 3 bits are used as trigger bits;  When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication of the uplink demodulation reference signal is used to indicate any of the available bits. As a trigger bit;  When the unit of the PUSCH resource allocation of the user terminal is 2 resource blocks, any one of the available bits of the resource block allocation and the frequency hopping resource allocation information is used as the trigger bit.  11. The method of claim 5, wherein  The downlink control information is downlink control information used for downlink scheduling, where the trigger bit is a newly added bit or any one or more of the following bits, and the resource indication information is any of the following bits. One or more 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 include: the modulation coding mode indication information has a higher 1 bit or a higher 2 bits or a higher 3 bits or a higher 4 bits or all bits; a 2-bit redundancy version bit; a 1-bit concentration And the distributed virtual resource block VRB allocation identifier bit; the available bit of the resource block allocation information, including: the upper 2 bits or the upper 3 bits of the resource block allocation information.  12. The method of claim 11 wherein  The resource indication information is implemented in one or more of the following ways:  When the retransmission combining mode is the tracking merge, or when the number of available redundancy versions is 1 or 2, any one or more of the redundancy version bits are used as the resource indication information;  When the VRB allocation is fixed or centralized, or the physical downlink shared channel PDSCH does not use high-order modulation, the centralized/distributed VRB allocation flag and/or the modulation coding mode indication information available information is used. One or more bits as resource indication information; When the downlink transport block is a retransmission transport block, the modulation and coding mode indication information is used as the resource indication information, and the modulation and coding mode indication information is used to indicate the modulation coding mode index/ _MCS to any of the k states in the range of 0 to 28. One to indicate aperiodic SRS resources, 1 k 29; When the downlink transmission data is retransmitted data, or when the NDI is 0, the 2 bits in the 5-bit modulation coding mode indication information indicate the redundancy version, and the remaining 3 bits serve as the resource indication information; When the redundancy version is fixed to one or two types, 1 bit or 2 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 more bits of the resource block allocation information available bits are used as the resource indication information.  13. The method of claim 11 wherein  The trigger bit is implemented in one or more of the following ways:  When the retransmission merge mode is restricted to track merge, or when the number of available redundancy versions is 1 or 2, any one of the redundancy version bits is used as the trigger bit;  When the VRB allocation is fixed or centralized, or the PDSCH does not use high-order modulation, the centralized/distributed VRB allocation flag or modulation coding mode is used to indicate any one of the available bits of the information as a trigger bit; When the uplink transport block is a retransmission transport block, the modulation and coding mode indication information is used as a trigger bit, and the modulation and coding mode indication information is used to indicate the modulation coding mode index/ _MCS as any one of the k states of 0 to 28. To trigger aperiodic SRS, 1 < k <29;  When the downlink transmission data is retransmitted data, or when the NDI is 0, the 2 bits in the 5-bit modulation coding mode indication information indicate the redundancy version, and any one or more of the remaining 3 bits are used as the trigger bits;  When the redundancy version is fixed to one or two, use 1 bit or 2 bits in the redundancy version as the trigger bit;  When the unit of the 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 the trigger bit.  14. The method of claim 1 wherein  The step of triggering, by the downlink control information, the user terminal to send an aperiodic SRS, and instructing the user terminal to use the resource used in the aperiodic SRS, includes: The downlink control information carries the joint indication information that triggers the aperiodic SRS and the indication resource, and the joint indication information is used to trigger the user terminal to send the aperiodic SRS, and the resource used by the user terminal to send the aperiodic SRS is simultaneously indicated. . 15. The method of claim 14, wherein  The joint indication information occupies m bits, m is an integer and 2 m < 15.  16. The method of claim 14, wherein  The downlink control information is downlink control information used for uplink scheduling, and the joint indication information is any one or more of the following bits: a 1-bit frequency hopping identifier bit; a modulation coding mode and a redundancy version indication information. The available bits include: a high-order bit or a high-bit 2 bits or a high-order 3 bits or a high-order 4 bits or all bits of the modulation coding mode and the redundancy version indication information; and a cyclic shift indication information of the uplink demodulation reference signal The available bits include: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; the available bits of the resource block allocation and the frequency hopping resource allocation information, including: the resource block allocation and the frequency hopping resource The upper 2 or higher 3 bits of the allocation information.  17. The method of claim 14, wherein  The downlink control information is downlink control information for indicating uplink multi-antenna transmission, and the joint indication information is any one or more of the following bits:  The 1-bit frequency hopping flag bit; the available bits of the modulation coding mode and the redundancy version indication information corresponding to the transmission block, including: the modulation code mode and the redundancy version indication information are higher or higher 2 bits or higher 3 Bit or high 4 bits or all bits; the available bits of the cyclic shift indication information of the uplink demodulation reference signal, including: 1 bit or 2 bits in the cyclic shift indication information of the uplink demodulation reference signal; The available bits of the allocation and frequency hopping resource allocation information include: the upper 2 bits or the upper 3 bits of the resource block allocation and the frequency hopping resource allocation information; when only one transport block is enabled, the corresponding corresponding to the transport block is not enabled. Modulation coding mode and indication of redundancy version.  18. The method of claim 16 or 17, wherein  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 uplink PUSCH does not use high-order modulation, the frequency hopping flag and the modulation coding mode and the redundancy version indication information are used as one or more bits. Instructing information, or using only one or more bits of the modulation coding mode and the redundancy version indication information available bits as joint indication information; When the uplink transport block is a retransmission transport block, the modulation coding mode and the redundancy version indication information are used as joint indication information, and the modulation and coding mode and the redundancy version indication information are modulated and coded. The mode index / _MCS indication is any one of the k states of 0 to 28 to indicate the aperiodic SRS resource, K k <29;  When the data transmitted in the uplink is the retransmitted data, or the NDI is 0, the 2-bit modulation coding mode and the 2 bits in the redundancy version indication information indicate the redundancy version, and the remaining 3 bits are used as the joint indication information;  When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed offset is 2 or 4 cyclic shifts, the cyclic shift indication of the uplink demodulation reference signal is used to indicate any of the available bits. Or multiple bits as joint instructions;  When the frequency hopping of the uplink PUSCH is not enabled and is satisfied: When the number of cyclic shifts of the uplink demodulation reference signal is 2 or 4, or when the fixed frequency is 2 or 4 cyclic shifts, the frequency hopping flag and the uplink solution are used. Adjusting, by the cyclic shift indication information of the reference signal, any one or more bits of the available bits of the information as joint indication information;  When the unit of the PUSCH resource allocation of the user terminal is 2 RBs, any one or more of the available bits of the resource block allocation and the frequency hopping resource allocation information are used as the joint indication information.  19. The method of claim 14, wherein  The downlink control information is downlink control information used for downlink scheduling, and the joint indication information is any one or more of the following bits:  The available bits of the modulation coding mode indication information include: the modulation coding mode indication information has a higher 1 bit or a higher 2 bits or a higher 3 bits or a higher 3 bits or all bits; a 2-bit redundancy version bit; a 1-bit concentration And a distributed VRB allocation identifier bit; the available bits of the resource block allocation information, including: a high 2 bits or a high 3 bits of the resource block allocation information.  20. The method of claim 19, wherein  The joint indication information is implemented in one or more of the following ways:  When the retransmission combining mode is the tracking merge, or when the number of available redundancy versions is 1 or 2, any one or more of the redundancy version bits are used as the joint indication information; When the virtual resource block VRB allocation is fixed or distributed, or the PDSCH does not use high-order modulation, the centralized/distributed VRB allocation flag and the modulation and coding mode indication information are used in any one or more bits. Bit as joint indication information, or only using modulation coding Any one or more of the information available bits are used as joint indication information; When the downlink transport block is a retransmission transport block, the modulation and coding mode indication information is used as the joint indication information, and the modulation and coding mode indication information is used to indicate the modulation coding mode index/ _MCS indication as any one of 0 to 28 Periodic SRS resources;  When the downlink transmission data is retransmitted data, or when the NDI is 0, the 2 bits in the 5-bit modulation coding mode indication information indicate the redundancy version, and the remaining 3 bits are used as the joint indication information; when the redundancy version is fixed to one In this case, the 2-bit redundancy version bit is used as the joint indication information; when the unit of the PDSCH resource allocation of the user terminal is 2 resource blocks, any one or more of the available bits of the resource block allocation information are used as a joint. Instructions.  21. The method according to claim 7 or 16, wherein  The format of the downlink control information used for uplink scheduling is format 0.  22. The method of claim 4 or 11 or 19, wherein  The format of the downlink control information used for downlink scheduling is format 1A.  A configuration system for measuring a reference signal, comprising: a base station and a user terminal, wherein: the base station is configured to send downlink control information to the user terminal, and the downlink control information is used to trigger the user terminal to send an aperiodic measurement reference signal SRS And indicating the resource used by the user terminal to send the aperiodic SRS;  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.