CN102404854B - The resource allocation method and system of a kind of uplink demodulation reference signal - Google Patents

Abstract

The present invention discloses a resource configuration method and system for an uplink demodulation reference signal. A base station configures N resources or parameter sets for sending an uplink demodulation reference signal for a user terminal through high-level signaling, and through the downlink control information K bits indicate that one of the N resources or parameter sets is used for the user terminal to send an uplink demodulation reference signal; the user terminal uses the resource or parameter set indicated by the K bits to send an uplink demodulation reference signal , where N and K are both positive integers. This solution saves signaling overhead, dynamically configures DMRS resources or parameter sets of UEs between cells, makes DMRSs of UEs between different cells orthogonal, overcomes scheduling restrictions, and enhances the multiplexing capacity of DMRSs, avoiding the need for multiplexing between different cells in related technologies. The UEs cannot achieve orthogonality, there are scheduling restrictions and insufficient DMRS multiplexing capacity, thus improving the transmission performance of the system.

Description

Resource allocation method and system for uplink demodulation reference signal

technical field

The present invention relates to the communication field, in particular, to a resource allocation method and system for an uplink demodulation reference signal (Demodulation Reference Signal, DMRS for short).

Background technique

The uplink physical channels of the Long Term Evolution system (LTE, Long Term Evolution) include Physical Random Access Channel (PRACH, Physical Random Access Channel), Physical Shared Channel (PUSCH, Physical uplinkshared channel), Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel) Channel). The uplink scheduling information (Uplink Scheduling Information) for the PUSCH is sent by the base station to a target user terminal (UE, UserEquipment) through a physical downlink control channel (Physical Downlink Control Channel, PDCCH for short). The uplink scheduling information includes: resource allocation related to the physical uplink shared channel, modulation and coding scheme, DMRS cyclic shift (Cyclic Shift) and other control information.

In the LTE system, the physical uplink shared channel is transmitted using a single antenna port. A system frame (frame) includes 10 subframes (subframe), and each subframe includes 2 time slots (slot). Fig. 1 is a schematic diagram of a normal cyclic prefix in a time slot according to the related art. As shown in Fig. 1, for a normal cyclic prefix (Normal cyclic prefix, referred to as NormalCP), each time slot consists of 6 data symbols and 1 Composed of demodulation reference signals. FIG. 2 is a schematic diagram of an extended cyclic prefix in a time slot according to the related art. For an extended cyclic prefix (Extended cyclic prefix, Extended CP for short), each time slot is composed of 5 data symbols and 1 demodulation reference signal. composition.

The demodulation reference signal DM RS consists of a sequence in the frequency domain, which is a cyclic shift of the reference signal sequence. In order to randomize the inter-cell interference, the reference signal sequence of the demodulation reference signal can be configured according to the base station, and the sequence hopping (Sequence hopping) or the sequence group hopping (Sequence group hopping, referred to as SGH) based on the time slot can also be called time slot hopping. SGH mode of slot jump. That is, according to the configuration of the base station, the demodulation reference signal of a user equipment on two time slots in a subframe is different, and changes with time slots in a system frame according to a certain hopping pattern.

In the time slot n _s , the cyclic shift α of the demodulation reference signal is: α=2πn _cs /12, where, In one radio frame, n _cs =0, 1, ..., 19; Configured by high-level parameters, Configured by uplink scheduling information, n _PRS (n _cs ) is generated by a pseudo-random generator and is a parameter that changes with time slot n _s , specifically expressed as The pseudo-random sequence generator is initialized once every wireless frame, and the initial condition is The initialization value is related to the ID of the cell to which it belongs, and is a cell-specific parameter.

The uplink scheduling information is carried on the physical downlink control channel, and is sent by the base station to the target user equipment in a certain downlink control information format (Downlink Control Information format, DCI format for short). In the LTE system, the downlink control information formats are divided into the following types: DCI format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, etc., among which, DCI format 0 contains uplink scheduling information for Indicates the scheduling of the physical uplink shared channel PUSCH.

The LTE-Advanced system (referred to as the LTE-A system) is a next-generation evolved system of the LTE system. In the LTE-A system, the physical uplink shared channel can be transmitted using a single antenna port or multiple antenna ports. Fig. 3 is a schematic diagram of baseband signal processing at the transmitting end of the physical uplink shared channel transmitted by multiple antenna ports in the related art LTE-A system. Space multiplexing of two codewords (Codeword, CW for short), each codeword corresponds to a Transport Block (Transport Block, TB for short). FIG. 4 is a schematic diagram of mapping from uplink codewords to layers in the related art LTE-A system. As shown in FIG. 4 , codewords are further mapped to layers, and each codeword is mapped to one or two layers of data.

LTE-A adopts a linear precoding technology (Precoding) based on a codebook (Codebook, also called a codebook). Techniques for preprocessing to improve the performance of multi-antenna systems. One way for the transmitting end to obtain the CSI is through feedback from the receiving end. In order to reduce the feedback overhead, a common method is to save the same codebook at the receiving end and the transmitting end. According to the current channel conditions, the receiving end selects a suitable precoding matrix in the codebook and feeds back its index value (Precoding Matrix Index, PMI) in the set to the transmitting end, and the transmitting end finds the precoding matrix index according to the feedback. A precoding matrix is used to precode the transmitted signal. The mathematical model of data precoding is y=HWs+n, where y is a received signal vector, H is a channel coefficient matrix, W is a precoding matrix, s is a signal vector, and n is a noise vector.

In the LTE-A system, when the physical uplink shared channel is transmitted using multiple antenna ports, the DMRS of each layer data is precoded the same as the data of each layer. The demodulation reference signals of different layers of data include the demodulation reference signals of the same user equipment in the single user multiple input multiple output system (SU-MIMO), and the multi user multiple input multiple output system (MU-MIMO) The demodulation reference signals of the multi-layer data of multiple user equipments are orthogonalized by using different demodulation reference signal cyclic shifts (CS) and/or orthogonal masks (Orthogonal Cover Code, OCC for short), to Distinguish different layers of data reused by user space or distinguish different users. Wherein, the orthogonal mask OCC is [+1, +1] and [+1, -1], which are applied to demodulation reference signals on two slots (Slot) in a subframe (Subframe).

At present, among the standard versions formulated by 3GPP, the LTE standard versions are Release 8 (Release 8) and Release 9 (Release 9), and the LTE-A standard version is Release 10 (Release 10), respectively abbreviated as Rel- 8, Rel-9 and Rel-10, the LTE-A standard may also include subsequent versions, such as Rel-11. In the current Rel-10 version, the base station can indicate the cyclic shift/OCC information of the demodulation reference signal used for the scheduled PUSCH through DCI format 0 and DCI format 4, as shown in Table 1.

Table 1 The cyclic shift area of the uplink related DCI format And [w ^(λ) (0)w ^(λ) (1)] mapping table

When using the orthogonal mask OCC to orthogonalize the demodulation reference signal, the base station needs to jointly detect the demodulation reference signal on two time slots in a subframe, thus requiring a user equipment to perform two slots in a subframe The demodulation reference signal must be the same over the time slots. In this case, the SGH method of time slot hopping in the LTE system cannot be used. However, in order to randomize inter-cell interference as much as possible, an SGH method of subframe jumping is proposed in the related art. That is, according to the configuration of the base station, the demodulation reference signal of a user equipment on two time slots in a subframe is the same, and the demodulation reference signal on each subframe in a system frame is different, according to a certain The jump pattern varies with subframes within a system frame.

Coordinated multi-point transmission technology utilizes the cooperative transmission of transmitting antennas of multiple cells to achieve higher capacity and reliable transmission of wireless links at the edge of the cell, which can effectively solve the problem of interference at the edge of the cell. Fig. 5 is a schematic diagram of downlink CoMP transmission in the related art. As shown in Fig. 5, downlink CoMP can be divided into two categories: joint processing/joint transmission (JP/JT for short) and cooperative scheduling/beam Shaping (Coordinated Scheduling/Beamforming, referred to as CS/CB). In JT, data is sent from multiple cells at the same time, and the sending data, scheduling and channel state information are only interacted between multiple transmission points in the cooperating set; while in CS/CB, only the serving cell sends data to the UE, Scheduling and Beamforming information are exchanged in the CoMP cooperating set. Different cells participating in transmission or cooperation form a cooperative set. For a certain UE, one cell in the cooperative set is the serving cell, and the remaining cells are the cooperative cells.

FIG. 6 is a schematic diagram of uplink coordinated multi-point transmission in the related art. As shown in FIG. 6, UE1 sends data to the base station or remote wireless terminal (Remote Radio Heads, RRH for short) of the serving cell and the cooperating cell, the coordinating cell and the serving cell Then the received data are merged and received. According to the current uplink DMRS signaling configuration method, according to the current uplink DMRS signaling configuration method, the sequence group number of the uplink DMRS is determined by u=(f _gh (n _s )+f _ss ) mod30, wherein the group jump pattern (group -hopping pattern) f _gh (n _s ) is determined by the cell ID, and the sequence-shift pattern (sequence-shift pattern) f _ss is divided into two types. For PUCCH, defined as: For PUSCH, defined as: Where Δ _ss ∈{0, 1, . . . , 29} is configured through high-level RRC signaling and is a cell-specific parameter. Therefore, the sequence group number of the uplink DMRS is determined by the cell ID and the cell-specific parameters configured by high-level signaling, and is a parameter configured semi-statically. When UE1 in cell 1 performs uplink CoMP transmission with cell 2 and the uplink DMRS of UE1 completely overlaps with UE2 in the frequency domain, in order to make UE1 and UE2 use the same sequence group number for the uplink DMRS of UE1 and UE2, Therefore, the sequences can be orthogonal through CS and/or OCC, reducing the interference between UE1 and UE2. When UE1 in cell 1 performs uplink CoMP transmission with cell 2 and the uplink DMRS of UE1 partially overlaps with UE2 in the frequency domain, if the sequence group numbers of UE1 and UE2 are the same, the difference between the uplink DMRS sequences of UE1 and UE2 There will be a large cross-correlation peak, even with OCC, the orthogonality is not very good, and OCC is also limited by Doppler frequency shift. At this time, if different root sequences can be configured, the cross-correlation peaks between sequences can be limited, thereby reducing interference. In addition, a new CoMP scenario is introduced in Rel-11, such as CoMP scenario 3 or Comp scenario 4 shown in Figure 7. If the cell ID of the macro base station and the low-power node below the macro base station are the same, it is CoMP scenario 4. If the cell IDs are different, CoMP scenario 3 will occur. In new scenarios of Rel-11, such as COMP scenario 4, the number of users will be relatively large. If the same bandwidth is configured to realize the orthogonality between UL COMP users and non-COMP users, it will bring scheduling restrictions and the multiplexing capacity of DMRS There may also be problems.

For the problems in the related art that UEs in different cells cannot achieve orthogonality, there are scheduling restrictions and insufficient DMRS multiplexing capacity, no effective solution has been proposed yet.

Contents of the invention

The present invention provides a resource configuration method and system for an uplink demodulation reference signal, which solves the problems in the prior art that UEs between different cells cannot realize orthogonality, scheduling restrictions and insufficient DMRS multiplexing capacity.

In order to solve the above technical problems, the present invention provides a resource configuration method for an uplink demodulation reference signal, wherein the base station configures N resources or parameter sets for the user terminal to send the uplink demodulation reference signal through high-layer signaling, and The K bits in the downlink control information indicate that one of the N resources or parameter sets is used for the user terminal to send the uplink demodulation reference signal; the user terminal uses the resource or parameter set indicated by the K bits Send an uplink demodulation reference signal, where N and K are both positive integers.

Further, the above method may also have the following characteristics:

The N resources or parameter sets include one or more of the following information: user-specific parameters used to determine the sequence group number of the uplink demodulation reference signal, parameters used to determine the shift pattern of the uplink demodulation reference signal sequence User-specific parameters, cyclic shift information configured by high-layer signaling, cell-specific parameters used to determine the demodulation reference signal sequence shift pattern of the physical shared channel (PUSCH), and used to determine the physical control channel (PUCCH) The user-specific parameters of the demodulation reference signal sequence shift pattern, the group frequency hopping enable indication, the sequence frequency hopping enable indication, the sequence group frequency hopping disable indication, the orthogonal mask (OCC) enablement of the demodulation reference signal It can indicate and demodulate the number of reference signal spatial multiplexing layers, and the sequence group number of the uplink demodulated reference signal.

Further, the above method may also have the following characteristics:

The downlink control information includes one or more of the following: downlink control information formats DCI format 0, DCI format 4, and DCI format 1A.

Further, the above method may also have the following characteristics:

K=ceil(log ₂ (N+1)) or K=ceil(log ₂ (N+1)), ceil means round up, K is an integer between 1 and 5, and N is an integer between 1 and 32 integer.

Further, the above method may also have the following characteristics:

The demodulation reference signal includes: a demodulation reference signal of a physical uplink shared channel (PUSCH) and a demodulation reference signal of a physical uplink control channel (PUCCH).

Further, the above method may also have the following characteristics:

The K bits correspond to newly added bits or existing bits in the downlink control information format.

Further, the above method may also have the following characteristics:

The K bits are carried in a user-specific DCI Format field or a user-specific search space.

Further, the above method may also have the following characteristics:

The K bits correspond to one or more of the following information: 3-bit information indicating the cyclic shift and orthogonal mask index of the demodulation reference signal, request information of the measurement reference signal (SRS), and resource block allocation information Higher 1 bit or upper 2 bits, upper 1 bit or upper 2 bits of modulation and coding mode and redundancy version indication information, modulation and coding mode and redundancy version indication information corresponding to disabled transport blocks, transmission of physical uplink control channel power control command.

In order to solve the above technical problems, the present invention also provides a resource configuration system for uplink demodulation reference signals, including a base station and a terminal, wherein the base station includes an uplink demodulation reference signal resource configuration module; A management module; an uplink demodulation reference signal resource configuration module, configured to configure N resources or parameter sets for sending uplink demodulation reference signals for the user terminal through high-level signaling, and indicate through K bits in the downlink control information One of the N resources or parameter sets is used for the user terminal to send an uplink demodulation reference signal; the uplink signal transmission management module is configured to use the resource or parameter set indicated by the K bits to send an uplink demodulation reference signal Signal, where N and K are both positive integers.

In order to solve the above technical problems, the present invention also provides a mobile terminal, wherein the mobile terminal includes an uplink signal transmission management module; the uplink signal transmission management module is used to use the downlink control information after receiving the downlink control information Send the uplink demodulation reference signal with the resource or parameter set indicated in .

In this solution, the base station configures multiple resources or parameter sets for the user terminal through high-level signaling, and dynamically selects one of the multiple resources or parameter sets through downlink control information, which can save signaling overhead and dynamically configure the DMRS resources of the UE between cells or The parameter set enables the DMRS of UEs between different cells to achieve orthogonality, overcomes scheduling restrictions, and enhances the multiplexing capacity of DMRS, avoiding the failure of UEs between different cells to achieve orthogonality, scheduling restrictions, and insufficient DMRS multiplexing capacity in related technologies problem, thereby improving the transmission performance of the system.

Description of drawings

FIG. 1 is a schematic diagram of a conventional cyclic prefix in a time slot in the prior art;

FIG. 2 is a schematic diagram of an extended cyclic prefix in a time slot in the prior art;

3 is a schematic diagram of baseband signal processing at a transmitting end of a physical uplink shared channel transmitted by multiple antenna ports in an LTE-A system in the prior art;

FIG. 4 is a schematic diagram of mapping from uplink codewords to layers of an LTE-A system in the prior art;

FIG. 5 is a schematic diagram of downlink CoMP transmission in the prior art;

FIG. 6 is a schematic diagram of uplink CoMP transmission in the prior art;

FIG. 7 is a schematic diagram of CoMP scenario 3 or scenario 4 in the prior art;

Fig. 8 is a schematic diagram of a resource configuration method for an uplink demodulation reference signal in an embodiment.

Detailed ways

As shown in Figure 3, the resource configuration method of the uplink demodulation reference signal includes:

The base station configures N resources or parameter sets for sending the uplink demodulation reference signal for the user terminal through high-layer signaling, and indicates that one of the N resources or parameter sets is used for all The user terminal sends an uplink demodulation reference signal;

The user terminal uses the resource or parameter set indicated by the K bits to send an uplink demodulation reference signal, where N and K are both positive integers.

The N resources or parameter sets include one or more of the following information: user-specific parameters used to determine the sequence group number of the uplink demodulation reference signal, parameters used to determine the shift pattern of the uplink demodulation reference signal sequence User-specific parameters, cyclic shift information configured by high-layer signaling, cell-specific parameters used to determine the demodulation reference signal sequence shift pattern of the physical shared channel (PUSCH), and used to determine the physical control channel (PUCCH) The user-specific parameters of the demodulation reference signal sequence shift pattern, the group frequency hopping enable indication, the sequence frequency hopping enable indication, the sequence group frequency hopping disable indication, the orthogonal mask (OCC) enablement of the demodulation reference signal It can indicate and demodulate the number of reference signal spatial multiplexing layers, and the sequence group number of the uplink demodulated reference signal.

The downlink control information includes one or more of the following: downlink control information formats DCI format 0, DCI format 4, and DCI format 1A.

K=ceil(log ₂ (N+1)) or K=ceil(log ₂ (N+1)), ceil means round up, K is an integer between 1 and 5, and N is an integer between 1 and 32 integer.

The demodulation reference signal includes: a demodulation reference signal of a physical uplink shared channel (PUSCH) and a demodulation reference signal of a physical uplink control channel (PUCCH).

The K bits correspond to one or more of the following information: 3-bit information indicating the cyclic shift and orthogonal mask index of the demodulation reference signal, request information of the measurement reference signal (SRS), and resource block allocation information Higher 1 bit or upper 2 bits, upper 1 bit or upper 2 bits of modulation and coding mode and redundancy version indication information, modulation and coding mode and redundancy version indication information corresponding to disabled transport blocks, transmission of physical uplink control channel power control command.

The K bits are carried in a user-specific DCI Format field or a user-specific search space.

The K bits correspond to newly added bits or existing bits in the downlink control information format. When the K bits are newly added bits in the downlink control information format, signaling overhead will be increased, but there are no scheduling restrictions and flexible configuration; when the K bits are existing bits in the downlink control information format, no increase will be made Signaling overhead, but there are scheduling constraints.

An uplink demodulation reference signal resource configuration system corresponding to the above method includes a base station and a terminal, wherein the base station includes an uplink demodulation reference signal resource configuration module; the terminal includes an uplink signal transmission management module; the uplink demodulation reference signal The resource configuration module is configured to configure N resources or parameter sets for sending uplink demodulation reference signals for the user terminal through high-layer signaling, and indicate the N resources or parameter sets through K bits in the downlink control information One is used for the user terminal to send an uplink demodulation reference signal; the uplink signal transmission management module is used to use the resource or parameter set indicated by the K bits to send an uplink demodulation reference signal, where N and K are both positive integer.

The mobile terminal corresponding to the above method includes an uplink signal transmission management module; the uplink signal transmission management module is configured to use the resources or parameter sets indicated in the downlink control information to send the uplink demodulation reference signal after receiving the downlink control information.

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

The following will be described in combination with preferred embodiments, and the following preferred embodiments combine the above-mentioned embodiments and preferred implementation modes.

Preferred embodiment one

The base station configures N resources or parameter sets for sending uplink DMRS for the user terminal through high-layer signaling.

The N resources or parameter sets used to send uplink DMRS include one or more of the following information: user-specific parameters used to determine the uplink DMRS sequence group number u, used to determine the uplink DMRS sequence shift pattern User-specific parameters of f _ss , cyclic shift information configured by high-level signaling, cell-specific parameters Δ _ss for determining the DMRS sequence shift pattern of PUSCH, user-specific parameters for determining the DMRS sequence shift pattern of PUCCH There are parameters, group frequency hopping enable indication, sequence frequency hopping enable indication, sequence group frequency hopping disable indication, DMRS orthogonal mask (OCC) enable indication, DMRS spatial multiplexing layer number, uplink demodulation reference The sequence group number of the signal.

The base station configures two user-specific parameters for determining the uplink DMRS sequence group number u or configures two user-specific parameters for determining the uplink DMRS sequence shift pattern f _ss for the user terminal, so that the user terminal can calculate Two alternative uplink DMRS sequence group numbers u1 and u2.

The base station instructs the user terminal to dynamically select a sequence group number from two alternative uplink DMRS sequence group numbers u1 and u2 as the final actual use of the user terminal through 1 bit in the downlink control information format 0 or format 4 or format 1A The uplink DMRS sequence group number.

The k-bit indication information in the downlink control information includes one or more of the following: 3-bit information indicating DMRS cyclic shift and OCC index, SRS request information, upper 1 or upper 2 bits of resource block allocation information , the upper 1 bit or upper 2 bits of the modulation and coding mode and redundancy version indication information, the modulation and coding mode and redundancy version indication information corresponding to the unenabled transport block, the transmit power control command of PUCCH (Transmit Power Control command for PUCCH , TPCcommand for PUCCH).

Preferably, the cyclic shift of the DMRS and the 3-bit information of the OCC index are used to dynamically instruct the user terminal to dynamically select a sequence group number from two alternative uplink DMRS sequence group numbers u1 and u2 as the final actual number of the user terminal. The number of the uplink DMRS sequence group used. The 3-bit information indicates 8 states: 000, 001, 010, 011, 100, 101, 110, 111, 4 states can be used to indicate the selection sequence group number u1, and the remaining 4 states represent the selection sequence group number u2 . For example, when the state represented by the 3-bit information is 000 or 001 or 010 or 011, select the sequence group number u1; when the state represented by the 3-bit information is 100 or 101 or 110 or 111, select the sequence group number u2.

Use the request information bit of the SRS to dynamically instruct the user terminal to dynamically select a sequence group number from two alternative uplink DMRS sequence group numbers u1 and u2 as the uplink DMRS sequence group number actually used by the user terminal. For example, when the state indicated by the SRS request bit in format 0 is 0, select u1, and when the state is 1, select u2; when the state represented by the SRS request bit in format 4 is 00 or 01, select u1, and the state is 10 or 11 Then choose u2.

Use the upper 1 bit of the resource block allocation information or use the upper 1 bit of the modulation and coding mode and redundancy version indication information or use the upper 1 bit of the modulation and coding mode and redundancy version indication information corresponding to the disabled transport block to dynamically indicate The user terminal dynamically selects one sequence group number from the two alternative uplink DMRS sequence group numbers u1 and u2 as the uplink DMRS sequence group number actually used by the user terminal. For example, when the upper 1 bit is 0, select u1, and when the upper 1 bit is 1, select u2.

The user terminal calculates the uplink DMRS sequence by using the selected sequence group number, and sends the DMRS.

Preferred embodiment two

The base station configures N resources or parameter sets for sending uplink DMRS for the user terminal through high-layer signaling.

The N resources or parameter sets used to send uplink DMRS include one or more of the following information: user-specific parameters used to determine the uplink DMRS sequence group number u, used to determine the uplink DMRS sequence shift pattern User-specific parameters of f _ss , cyclic shift information configured by high-level signaling, cell-specific parameters Δ _ss for determining the DMRS sequence shift pattern of PUSCH, user-specific parameters for determining the DMRS sequence shift pattern of PUCCH There are parameters, group frequency hopping enable indication, sequence frequency hopping enable indication, sequence group frequency hopping disable indication, DMRS orthogonal mask (OCC) enable indication, DMRS spatial multiplexing layer number, uplink demodulation reference The sequence group number of the signal.

The base station configures four user-specific parameters for determining the uplink DMRS sequence group number u or configures four user-specific parameters for determining the uplink DMRS sequence shift pattern f _ss for the user terminal, so that the user terminal can calculate Four alternative uplink DMRS sequence group numbers u1, u2, u3, u4.

The base station instructs the user terminal to dynamically select a sequence group number from four alternative uplink DMRS sequence group numbers u1, u2, u3, and u4 as the user terminal through 2 bits in the downlink control information format 0 or format 4 or format 1A The uplink DMRS sequence group number actually used by the terminal.

The k-bit indication information in the downlink control information includes one or more of the following: 3-bit information indicating DMRS cyclic shift and OCC index, SRS request information, upper 1 or upper 2 bits of resource block allocation information , the upper 1 bit or upper 2 bits of the modulation and coding mode and redundancy version indication information, the modulation and coding mode and redundancy version indication information corresponding to the unenabled transport block, the transmit power control command of PUCCH (Transmit Power Control command for PUCCH , TPCcommand for PUCCH).

Use the 3-bit information of the cyclic shift of the DMRS and the OCC index to dynamically instruct the user terminal to dynamically select a sequence group number from the four alternative uplink DMRS sequence group numbers u1, u2, u3, and u4 as the final sequence group number for the user terminal The number of the uplink DMRS sequence group actually used. The 3-bit information indicates 8 states: 000, 001, 010, 011, 100, 101, 110, 111, 2 states can be used to indicate the selection sequence group number u1, and the 2 states represent the selection sequence group number u2, 2 One state represents the selection sequence group number u3, and two states represent the selection sequence group number u4. For example, when the state represented by the 3-bit information is 000 or 001, the sequence group number u1 is selected; when the state represented by the 3-bit information is 010 or 011, the sequence group number u2 is selected; when the state represented by the 3-bit information is When the state is 100 or 101, the sequence group number u3 is selected; when the state represented by the 3-bit information is 110 or 111, the sequence group number u4 is selected.

Use the request information bit of the SRS to dynamically instruct the user terminal to dynamically select a sequence group number from the four alternative uplink DMRS sequence group numbers u1, u2, u3, and u4 as the uplink DMRS sequence group actually used by the user terminal Numbering. For example, when the state indicated by the SRS request bit in format 4 is 00, select u1, when the state is 01, select u2, when the state is 10, select u3, and when the state is 11, select u4.

Use the upper 2 bits of the resource block allocation information or use the upper 2 bits of the modulation and coding mode and redundancy version indication information or use the upper 2 bits of the modulation and coding mode and redundancy version indication information corresponding to the disabled transport block to dynamically indicate The user terminal dynamically selects one sequence group number from the four alternative uplink DMRS sequence group numbers u1, u2, u3, and u4 as the uplink DMRS sequence group number actually used by the user terminal. For example, select u1 when the upper 2 bits are 00, select u2 when the upper 2 bits are 01, select u3 when the upper 2 bits are 10, and select u4 when the upper 2 bits are 11.

The user terminal calculates the uplink DMRS sequence by using the selected sequence group number, and sends the DMRS.

Preferred Embodiment Three

This embodiment provides a DMRS configuration method, which includes that the base station can configure different uplink DMRS sequence group numbers for users with the same cell ID (such as CoMP scenario 4), so as to achieve the purpose of increasing the uplink DMRS multiplexing capacity.

Taking CoMP scenario 3 or Comp scenario 4 shown in Figure 7 as an example, if the cell IDs of the macro base station and the low-power node below the macro base station are the same, it is CoMP scenario 4, and if the cell IDs are different, it is CoMP scenario 3 . Taking CoMP scenario 4 as an example, according to the configuration method of the 3GPP Rel-10 protocol in the related art, the uplink DMRS sequence group numbers of users under the same macro base station are the same, and all belong to the uplink DMRS sequence group numbers of users under the low-power node They are all the same, but the number of users in CoMP scenario 4 is generally relatively large, which is prone to the problem of DMRS resource conflict caused by insufficient multiplexing capacity. Using the solution of the present invention, the base station can configure multiple user-specific parameters for determining the uplink DMRS sequence group number u or configure multiple user-specific parameters for determining the uplink DMRS sequence shift pattern f _ss for the user terminal , the user terminal can thus calculate multiple candidate uplink DMRS sequence group numbers, and then according to the downlink control information sent by the base station, the user terminal dynamically selects a sequence group number from multiple uplink DMRS sequence group numbers as this The uplink DMRS sequence group number actually used by the user terminal, when there are many users for uplink transmission, different uplink DMRS sequence group numbers can be configured for users with the same cell ID, and dynamically switched from CoMP scenario 4 to CoMP scenario 3, so that Overcome the scheduling limitation that the same time-frequency resources must be allocated (partial overlapping of frequency domain resources is enough), and increase the multiplexing capacity of DMRS. When there are not many users for uplink transmission, users configured with uplink CoMP and interfering users (such as UE1 and UE2) occupy the same time-frequency resource and use the same root sequence, so that users can use CS and/or OCC to perform orthogonality.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

Claims (7)

1. A resource allocation method for an uplink demodulation reference signal, wherein, The base station configures N resources or parameter sets for sending the uplink demodulation reference signal for the user terminal through high-layer signaling, and indicates that one of the N resources or parameter sets is used for all The user terminal sends an uplink demodulation reference signal; The user terminal uses the resource or parameter set indicated by the K bits to send an uplink demodulation reference signal, where N and K are both positive integers; The K bits correspond to one or more of the following information: 3-bit information indicating the cyclic shift and orthogonal mask index of the demodulation reference signal, request information of the measurement reference signal (SRS), resource block allocation information The upper 1 or upper 2 bits, the modulation and coding mode and redundancy version indication information corresponding to the disabled transport block, and the transmit power control command of the physical uplink control channel; The N resources or parameter sets include one or more of the following information: User-specific parameters used to determine the sequence group number of the uplink demodulation reference signal, user-specific parameters used to determine the shift pattern of the uplink demodulation reference signal sequence, and demodulation reference parameters used to determine the physical shared channel (PUSCH) Cell-specific parameters of the signal sequence shift pattern, user-specific parameters for determining the demodulation reference signal sequence shift pattern of the physical control channel (PUCCH), group frequency hopping enable indication, sequence frequency hopping enable indication, sequence Group frequency hopping disable indication, demodulation reference signal orthogonal mask (OCC) enable indication, demodulation reference signal spatial multiplexing layer number, sequence group number of uplink demodulation reference signal. 2. The method of claim 1, wherein The downlink control information includes one or more of the following: downlink control information formats DCI format 0, DCI format 4, and DCI format 1A. 3. The method of claim 1, wherein, K=ceil(log ₂ (N+1)), ceil represents rounding up, K is an integer between 1 and 5, and N is an integer between 1 and 32. 4. The method of claim 1, wherein, The demodulation reference signal includes: a demodulation reference signal of a physical uplink shared channel (PUSCH) and a demodulation reference signal of a physical uplink control channel (PUCCH). 5. The method of claim 1, wherein, The K bits correspond to newly added bits or existing bits in the downlink control information format. 6. The method of claim 1, wherein, The K bits are carried in a user-specific DCI Format field or a user-specific search space. 7. A resource configuration system for an uplink demodulation reference signal, including a base station and a terminal, wherein, The base station includes an uplink demodulation reference signal resource configuration module; the terminal includes an uplink signal transmission management module; The uplink demodulation reference signal resource configuration module is configured to configure N resources or parameter sets for sending uplink demodulation reference signals for the user terminal through high-level signaling, and indicate the N through K bits in the downlink control information One of resources or parameter sets is used for the user terminal to send an uplink demodulation reference signal; The uplink signal transmission management module is configured to use the resource or parameter set indicated by the K bits to send an uplink demodulation reference signal, where N and K are both positive integers; The K bits correspond to one or more of the following information: 3-bit information indicating the cyclic shift and orthogonal mask index of the demodulation reference signal, request information of the measurement reference signal (SRS), resource block allocation information The upper 1 or upper 2 bits, the modulation and coding mode and redundancy version indication information corresponding to the disabled transport block, and the transmit power control command of the physical uplink control channel; The N resources or parameter sets include one or more of the following information: User-specific parameters used to determine the sequence group number of the uplink demodulation reference signal, user-specific parameters used to determine the shift pattern of the uplink demodulation reference signal sequence, and demodulation reference parameters used to determine the physical shared channel (PUSCH) Cell-specific parameters of the signal sequence shift pattern, user-specific parameters for determining the demodulation reference signal sequence shift pattern of the physical control channel (PUCCH), group frequency hopping enable indication, sequence frequency hopping enable indication, sequence Group frequency hopping disable indication, demodulation reference signal orthogonal mask (OCC) enable indication, demodulation reference signal spatial multiplexing layer number, sequence group number of uplink demodulation reference signal.