WO2018137211A1

WO2018137211A1 - Dmrs transmission method and device

Info

Publication number: WO2018137211A1
Application number: PCT/CN2017/072688
Authority: WO
Inventors: 贺传峰; 张瑞齐
Original assignee: 华为技术有限公司
Priority date: 2017-01-25
Filing date: 2017-01-25
Publication date: 2018-08-02
Also published as: CN110178425A

Abstract

Provided by the present application are a demodulation reference signal (DMRS) transmission method and device. The method comprises: a user equipment (UE) determines a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable and a CSF determined according to a preset rule, wherein the preset CSF hopping step size is 4, and the random variable is generated according to a preset random sequence; and the UE transmits the DMRS to a base station according to a set of cyclic shifts (CS), orthogonal cover codes (OCC) and subcarriers mapped by the CSF corresponding to the DMRS of the current subframe, so that when the DMRS is transmitted according to the set of CS, OCC and subcarriers mapped by the CSF corresponding to the DMRS of the current subframe, it is still possible to maintain the orthogonality between DMRSes of multiplexed UE, thereby allowing the base station to correctly distinguish when the same receives DMRSes from different UE, which improves the performance of the base station in demodulating a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH), so that channel estimation accuracy is improved, and the uplink throughput of the UE is thus improved.

Description

DMRS transmission method and device

Technical field

The present application relates to communications technologies, and in particular, to a De Modulation Reference Signal (DMRS) transmission method and apparatus.

Background technique

In the uplink of the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), the Physical Uplink Shared Channel (PUSCH) and the Physical Uplink Control Channel (Physical Uplink) Control Channel, PUCCH) are transmitted in units of subframes. One subframe is composed of two slots, and each slot includes a plurality of Discrete-Fourier-Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) symbols. The base station performs coherent demodulation on the PUSCH and the PUCCH according to the DMRS sent by the user equipment (User Equipment, UE). In the time domain, the DMRS is transmitted in different DFT-S-OFDM symbols with the PUSCH and the PUCCH. In the frequency domain, the DMRS and the PUSCH and the PUCCH are transmitted in the same resource block (Resource Block, RB). FIG. 1 is a schematic diagram of time-frequency resource allocation of a DMRS when the bandwidth is one RB. As shown in FIG. 1, the frequency domain of the resource includes 12 subcarriers, and the uplink subframe included in the resource includes 14 symbols, wherein for PUSCH transmission, there are two symbols for carrying the DMRS. The DMRS occupies all 12 subcarriers in the RB.

The base station allocates uplink PUSCHs of different UEs to different RBs for transmission by using the uplink scheduling, so as to ensure that the PUSCH and the DMRS between different UEs are orthogonalized by Frequency-Division Multiplexing (FDM). In multi-input multi-output (MIMO) technology, uplink PUSCH transmission can be divided into single user (SU) MIMO and multiple user (MU) MIMO transmission. In SU-MIMO transmission, a base station implements orthogonalization of DMRS between UEs by allocating different RBs to different UEs. In MU-MIMO transmission, the base station may allocate the same RB to different UEs, and the UE that satisfies certain conditions multiplexes the same RB for transmission by MU-MIMO transmission. According to the bandwidth allocation type of the multiplexed UE, the MU-MIMO transmission can be further divided into two types: uplink MU-MIMO transmission with completely overlapping bandwidth (bandwidth of different multiplexed UEs overlaps completely) and uplink MU-MIMO transmission with partial overlapping of bandwidth (The bandwidth of the different UEs multiplexed partially overlaps). 2 is a schematic diagram of MU-MIMO transmission with completely overlapping bandwidth and partially overlapping bandwidth. As shown in FIG. 2, the scheduling bandwidth of UE1 in MU-MIMO transmission is partially overlapped with the scheduling bandwidth of UE2 or UE3, and the scheduling bandwidths of UE2 and UE3 are completely overlapping. Regardless of the type of bandwidth allocation, in the overlapping portion of the bandwidth, the DMRSs of different UEs need to be orthogonal. For uplink MU-MIMO transmissions with completely overlapping bandwidth, different complex shifts (Cyclic Shift, CS) sequences and/or Orthogonal Cover Code (OCC) based on the same DMRS base sequence are used to satisfy different complexes. The DMRS of the UE can be mutually orthogonal. For uplink MU-MIMO transmissions with partially overlapping bandwidths, DMRSs from different multiplexed UEs can only be mutually orthogonal by using OCC. The length of the OCC is 2, so for uplink MU-MIMO with partially overlapping bandwidths, the number of multiplexed UEs that can be supported is up to 2 in the overlapping bandwidth.

In the prior art, the DMRS can be further increased by using different sets of subcarriers in the RB to carry different DMRSs. Increase the spectrum efficiency by adding the number of multiplexed UEs that can be supported. FIG. 3 is a schematic diagram of the distribution of enhanced DMRS in time-frequency resources. As shown in FIG. 3, the DMRSs of different UEs: the set of subcarriers used by DMRS1 and DMRS2 present a comb-like distribution within the time-frequency resource. Different DMRSs can occupy different combs and achieve orthogonality in the frequency domain, thereby increasing the number of orthogonal DMRSs on the basis of CS and OCC orthogonality. The comb-shaped DMRS may also be referred to as Interleaved Frequency Division Multiple Access (IFDMA). The interval of subcarriers of the IFDMA DMRS can be represented by a Repetition Factor (RPF). In a MU-MIMO scenario where bandwidth is partially overlapped, the number of orthogonal DMRSs can be increased by IFDMA: when RPF=2, four orthogonal DMRSs can be supported in combination with OCC; when RPF=4, combined with OCC can support 8 orthogonal DMRS. For the randomization of the inter-cell interference, it is necessary to perform hopping on the comb of the corresponding DMRS when the UE transmits in the uplink of different subframes. In the prior art, the UE can perform hopping according to a static or pseudo-random pattern.

However, for different multiplexed UEs for uplink MU-MIMO transmission, the DMRSs of different multiplexed UEs are orthogonal at the last transmission before hopping, and the UE transmits DMRS according to static or pseudo-random patterns at the next transmission. After the comb is hopped, if the multiplexed UEs are still multiplexed by MU-MIMO in the next transmission, the DMRSs of the multiplexed UEs may not be orthogonal after the comb hopping respectively, which may result in The DMRSs of different multiplexed UEs interfere with each other, and the signal quality of the DMRSs of the eNBs receiving the different UEs is deteriorated, resulting in a decrease in the channel estimation performance, so that the performance of the base station is degraded when demodulating the PUSCH and the PUCCH, and further, the UE is caused. The upstream throughput drops.

Summary of the invention

The present application provides a DMRS transmission method and apparatus to improve uplink throughput of a UE.

In a first aspect, the present application provides a DMRS transmission method, including: determining, by a UE, a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, where The CSF hopping step size is 4, and the random variable is generated according to a preset random sequence; the UE sends the DMRS to the base station according to the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe. When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared with the DMRS of the multiplexed UE, the DMRS is multiplexed according to the static or pseudo-random pattern, and the DMRSs that are originally orthogonal to each other when the UE performs the last uplink MU-MIMO transmission are used in the uplink MU-MIMO transmission of the current subframe. The method of the present application can ensure that the base station can correctly distinguish the DMRSs of different UEs when the DMRSs of different UEs are received, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of channel estimation. The uplink throughput of the UE is improved.

In a possible design of the first aspect, the UE determines the CSF corresponding to the DMRS of the current subframe according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, including: the UE according to the formula

Determining a CSF corresponding to a DMRS of a current subframe; wherein n _PN (x) is a random variable,

For numbering

The value of the random variable of the sub-frame,

For absolute subframe numbering,

n _f is the radio frame number, j is the subframe number in one radio frame, and CSF _init is the CSF determined according to the preset rule. In this implementation, when determining the CSF corresponding to the DMRS of the current subframe, the interference randomization of the DMRS between the neighboring cell UEs is implemented.

In a possible design of the first aspect, the method further comprises: the UE according to the formula

determine

The value, ie according to the preset random sequence c(y), is numbered

The value of the sub-frame determines the random variable

The value.

In a possible design of the first aspect, the method further comprises:

UE according to the formula

Determining random variables

In numbered

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the first aspect, the method further comprises:

UE according to the formula

Determining random variables

In numbered

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible design of the first aspect, the preset rule is: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the SPS initial transmission The CSF corresponding to the DMRS of the subframe; or the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or, the preset CSF .

In a possible design of the first aspect, the UE sends the DMRS to the base station according to the CSF mapping CS, OCC, and subcarrier set corresponding to the DMRS of the current subframe, including: the UE according to the CSF, the CS, the OCC, and the subcarrier set. The mapping relationship and the CSF corresponding to the DMRS of the current subframe determine the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe; and the CS according to the DMRS base sequence and the CSF mapping corresponding to the DMRS of the current subframe And the OCC generates the DMRS; the UE transmits the DMRS on the CSF mapped subcarrier set corresponding to the DMRS of the current subframe.

In one possible design of the first aspect, the set of subcarriers is a set of even subcarriers or a set of odd subcarriers.

In a second aspect, the present application provides a DMRS transmission method, including: determining, by a base station, a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, where The CSF hopping step size is 4, the random variable is generated according to a preset random sequence, and the current subframe is a subframe of the DMRS sent by the receiving UE; the base station is configured according to the CSF mapping CS and OCC corresponding to the DMRS of the current subframe. A set of subcarriers, receiving a DMRS.

In a possible design of the second aspect, the base station determines, according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, the CSF corresponding to the DMRS of the current subframe, including:

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

n _f is the radio frame number, j is the subframe number in one radio frame, and CSF _init is the CSF determined according to the preset rule.

In a possible design of the second aspect, the method further comprises:

Base station according to formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the second aspect, the method further comprises:

Base station according to formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the second aspect, the method further comprises:

Base station according to formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible design of the second aspect, the preset rule is: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the SPS initial transmission The CSF corresponding to the DMRS of the subframe; or the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or, the preset CSF .

In a third aspect, the application provides a UE, including: a transceiver; a memory for storing an instruction; and a processor connected to the memory and the transceiver, respectively, for executing an instruction to perform the following steps when executing the instruction: according to the pre- The CSF hopping step size, the random variable, and the CSF determined according to the preset rule determine the CSF corresponding to the DMRS of the current subframe, where the preset CSF hopping step size is 4, and the random variable is preset according to the randomness. Sequence generation; transmitting DMRS to the base station according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe.

In a possible design of the third aspect, the processor is configured to: determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe: According to the formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

In a possible design of the third aspect, the processor is further configured to:

According to the formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

According to the formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

According to the formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible design of the third aspect, the preset rule is: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the SPS initial transmission The CSF corresponding to the DMRS of the subframe; or the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or, the preset CSF .

In a possible design of the third aspect, the DMRS is sent to the base station according to the CSF mapped CS, OCC, and subcarrier set corresponding to the DMRS of the current subframe, and the processor is configured to: according to CSF, CS, OCC, and The mapping relationship of the subcarrier set and the CSF corresponding to the DMRS of the current subframe determine the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe; and the CSF mapping corresponding to the DMRS of the current subframe according to the DMRS base sequence The CS and the OCC generate a DMRS; the DMRS is transmitted on the CSF mapped subcarrier set corresponding to the DMRS of the current subframe.

In a fourth aspect, the present application provides a base station, including: a transceiver; a memory, configured to store an instruction; a processor, connected to the memory and the transceiver, respectively, for executing an instruction to perform the following steps when executing the instruction: according to the pre- The CSF hopping step size, the random variable, and the CSF determined according to the preset rule determine the CSF corresponding to the DMRS of the current subframe, where the preset CSF hopping step size is 4, and the random variable is preset according to the randomness. The sequence is generated, the current subframe is a subframe of the DMRS that is sent by the UE, and the DMRS is received according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe.

In a possible design of the fourth aspect, in terms of determining a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, the processor is configured to: According to the formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

In a possible design of the fourth aspect, the processor is further configured to:

According to the formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

According to the formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

According to the formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible design of the fourth aspect, the preset rule is: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the SPS initial transmission The CSF corresponding to the DMRS of the subframe; or the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or, the preset CSF .

In a fifth aspect, the application provides a UE, including: a first determining module, configured to determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe. The preset CSF hopping step size is 4, the random variable is generated according to a preset random sequence, and the sending module is configured to: according to the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe, The base station transmits the DMRS.

In a possible design of the fifth aspect, the first determining module is specifically configured to: according to the formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

In a possible design of the fifth aspect, the UE further includes:

a second determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the fifth aspect, the UE further includes:

a third determining module for using a formula

Determine the random variable number is

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the fifth aspect, the UE further includes:

Fourth determining module for formulating according to formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible design of the fifth aspect, the preset rule is: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the SPS initial transmission The CSF corresponding to the DMRS of the subframe; or the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or, the preset CSF .

In a possible design of the fifth aspect, the sending module includes: a determining submodule, configured to determine, according to a mapping relationship between the CSF, the CS, the OCC, and the set of subcarriers, and the CSF corresponding to the DMRS of the current subframe, and the current subframe. a CSF mapping CS, OCC, and subcarrier set corresponding to the DMRS; a generating submodule, configured to generate a DMRS according to the DMRS base sequence, the CSF mapping CS and the OCC corresponding to the DMRS of the current subframe; and the sending submodule, configured to The DMRS is transmitted on the CSF mapped subcarrier set corresponding to the DMRS of the current subframe.

In a sixth aspect, the application provides a base station, including: a first determining module, configured to determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe. The preset CSF hopping step size is 4, the random variable is generated according to a preset random sequence, the current subframe is a subframe of the DMRS sent by the receiving UE, and the receiving module is configured to respond according to the DMRS of the current subframe. The CSF maps the CS, OCC, and subcarrier sets to receive the DMRS.

In a possible design of the sixth aspect, the first determining module is specifically configured to: according to a formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

In a possible design of the sixth aspect, the base station further includes:

a second determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the sixth aspect, the base station further includes:

a third determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of the time.

In a possible design of the sixth aspect, the base station further includes:

Fourth determining module for formulating according to formula

Determine the random variable numbered as

The value of the sub-frame; where c(y) is the preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible design of the sixth aspect, the preset rule is: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the SPS initial transmission The CSF corresponding to the DMRS of the subframe; or the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or, the preset CSF .

DRAWINGS

FIG. 1 is a schematic diagram of time-frequency resource allocation of a DMRS when the bandwidth is one RB;

2 is a schematic diagram of MU-MIMO transmission with completely overlapping bandwidth and partially overlapping bandwidth;

3 is a schematic diagram of distribution of enhanced DMRS in time-frequency resources;

4 is a schematic flowchart of an embodiment of a DMRS transmission method provided by the present application;

FIG. 5 is a schematic structural diagram of Embodiment 1 of a UE according to the present application;

FIG. 6 is a schematic structural diagram of Embodiment 1 of a base station according to the present application;

FIG. 7 is a schematic structural diagram of Embodiment 2 of a UE according to the present application;

FIG. 8 is a schematic structural diagram of Embodiment 2 of a base station provided by the present application.

detailed description

The DMRS transmission method provided by the present application is used in an uplink MU-MIMO transmission in a scenario in which the bandwidth of the multiplexed UE is partially overlapped. The DMRS transmission method provided by the present application determines, by the UE, the CSF corresponding to the DMRS of the current subframe according to a preset Cyclic Shift Field (CSF) hopping step size, a random variable, and a CSF determined according to a preset rule. The preset CSF hopping step size is 4, and the random variable is generated according to a preset random sequence, according to a cyclic shift (Cyclic Shift, CS) and an orthogonal cover code of the CSF mapping corresponding to the DMRS of the current subframe. Orthogonal Cover Code (OCC) and a set of subcarriers, which send DMRS to the base station. When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared with the DMRS of the multiplexed UE, the DMRS is multiplexed according to the static or pseudo-random pattern, and the DMRSs that are originally orthogonal to each other when the UE performs the last uplink MU-MIMO transmission are used in the uplink MU-MIMO transmission of the current subframe. The method of the present application can ensure that the base station can correctly distinguish the DMRSs of different UEs when the DMRSs of different UEs are received, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of channel estimation. The uplink throughput of the UE is improved.

FIG. 4 is a schematic flowchart diagram of an embodiment of a DMRS transmission method provided by the present application. As shown in FIG. 4, the DMRS transmission method provided by the present application includes the following steps:

S401: The UE determines, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of the current subframe.

The preset CSF hopping step size is 4, and the random variable is generated according to a preset random sequence.

Specifically, in the present application, the UE needs to send the DMRS on the current subframe. In order to randomize interference between cells, the set of subcarriers carrying the DMRS in the RB corresponding to the current subframe needs to be hopped or not hopped compared to the set of subcarriers carrying the DMRS in the RB corresponding to the previous subframe in which the DMRS is transmitted. The set of subcarriers involved in the present application refers to a set of odd subcarriers or a set of even subcarriers for a repetition factor of 2. For example, as shown in FIG. 3, one RB includes 12 subcarriers. The subcarriers are numbered 0-11, the subcarriers numbered 0, 2, 4, 6, 8, and 10 are even subcarriers, and the subcarriers numbered 1, 3, 5, 7, 9, and 11 are odd subcarriers. Carrier. The occurrence of the hopping means that the subcarrier carrying the DMRS in the RB corresponding to the previous subframe is an odd subcarrier, and the subcarrier carrying the DMRS in the RB corresponding to the current subframe is an even subcarrier.

Since the orthogonality between the hopped DMRS and other DMRSs transmitted by the UE multiplexed with the UE that transmits the DMRS needs to be considered, the set of subcarriers carrying the DMRS needs to be hopped according to a certain rule.

The mapping relationship between the CSF, the CS, the OCC, and the set of subcarriers is predefined by the base station and the UE. Illustratively, the mapping relationship may be shown in the form of a mapping table. Table 1 is a mapping table of CSF, CS, OCC, and subcarrier sets.

Table 1 Mapping table of CSF, CS, OCC and subcarrier sets

As shown in Table 1, it can be seen that different sets of subcarriers correspond to different CSFs, CSs, and OCCs. In this application, the CSF corresponding to the DMRS of the current subframe needs to be determined first. After the CSF corresponding to the DMRS of the current subframe is determined, the CS, OCC, and sub-maps mapped in Table 1 according to the determined CSF may be determined. The carrier set sends the DMRS. In other words, in the present application, the hopping of the set of subcarriers carrying the DMRS is converted into the hopping of the CSF corresponding to the DMRS of the current subframe.

It should be noted that λ in Table 1 represents the CS and OCC corresponding to the DMRS transmitted by different layers in the UE.

In the present application, when determining the CSF corresponding to the DMRS of the current subframe, the UE may determine according to the following manner: according to the formula

The CSF corresponding to the DMRS of the current subframe is determined. Where n _PN (x) is a random variable,

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

It should be noted that, in the above formula, the coefficient 4 before the random variable is the preset CSF hopping step size.

In a possible implementation manner, the UE according to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

Time value, ie,

In the random sequence of c(y), when

An element of it.

In another possible implementation manner, the UE may

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

In yet another possible implementation manner, the UE is based on

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

The preset random sequence may be a random sequence defined by the LTE protocol. Optionally, the initial value of the preset random sequence may be related to a cell identifier of the UE, or may be related to an identifier of the UE, to implement randomization of the preset random sequence.

Certainly, the preset random sequence in this application may have other implementation manners, and the present application does not limit the content herein.

In this step, in the CSF determined according to the preset rule, the preset rule may have the following possible implementation manners: the CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe a subframe for transmitting a DMRS; or a CSF corresponding to a DMRS of a subframe in which a semi-persistent scheduling (SPS) is initially transmitted; or a first time in a Hybrid Automatic Repeat Request (HARQ) The CSF corresponding to the DMRS of the transmitted subframe; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or the preset CSF. The preset CSF is a certain CSF specified in advance. The preset rule may also be a CSF corresponding to the DMRS of any subframe between the current subframe and the subframe initially transmitted by the SPS. It should be noted that the previous subframe of the current subframe may not send the DMRS, and the previous subframe of the current subframe involved in the present application is the previous subframe of the DMRS.

It can be seen from Table 1 that after determining the CSF corresponding to the DMRS of the current subframe, the CS, OCC, and subcarrier sets of the CSF mapping can be found in Table 1 according to the CSF.

S402: The UE sends the DMRS to the base station according to the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe.

Specifically, a possible implementation process is as follows: the UE determines the CS of the CSF mapping corresponding to the DMRS of the current subframe according to the mapping relationship between the CSF, the CS, the OCC and the set of subcarriers, and the CSF corresponding to the DMRS of the current subframe. OCC and subcarrier set; the CSF mapping corresponding to the DMRS base sequence and the DMRS of the current subframe according to the DMRS base sequence The transmitted CS and the OCC generate a DMRS; the UE transmits the DMRS on the CSF mapped subcarrier set corresponding to the DMRS of the current subframe.

The UE saves the mapping relationship, for example, Table 1, locally. After determining the CSF corresponding to the DMRS of the current subframe, the UE searches the mapping table 1 for the CS, OCC, and subcarrier sets of the CSF mapping. Thereafter, the UE generates a DMRS according to the DMRS base sequence, the CSF mapped CS corresponding to the DMRS of the current subframe, and the CSF mapped COC corresponding to the DMRS of the current subframe. The generation process may be: DMRS can be represented as a cyclic shift of a base sequence,

among them,

For the base sequence, α is a cyclic shift,

It is divided into several groups, where u∈{0,1,...,29} is the group number and v is the base serial number within the group. After the DMRS is generated, the UE transmits the DMRS on the CSF mapped subcarrier set corresponding to the DMRS of the current subframe.

The following process is illustrated by a specific example:

In the previous subframe, the CSF corresponding to the UE1 is 000, that is, the subcarrier set of the DMRS carrying the UE1 in the RB corresponding to the previous subframe in which the DMRS is transmitted is an odd subcarrier. The CSF of the UE2 is 001, that is, the set of subcarriers carrying the DMRS of the UE2 in the RB corresponding to the previous subframe of the DMRS is an odd subcarrier. As can be seen from Table 1, the DMRSs of UE1 and UE2 are orthogonal by OCC.

If the hopping is performed according to the random pattern, the UE1 may not be hopped, and the corresponding CSF is still 000. After the hopping, the CSF corresponding to the DMRS of the UE2 may be 111. It can be seen from Table 1 that the current subframe corresponds to the current subframe. The set of subcarriers carrying the DMRS of UE2 in the RB is an odd subcarrier. It can be seen from Table 1 that the OCC of UE1 is the same as the OCC of UE2, the subcarrier set of UE1 is the same as the subcarrier set of UE2, and the DMRS of UE1 and the DMRS of UE2 cannot continue to be orthogonal.

If the hopping is performed according to the manner provided in this application, it is assumed that the output of the random variable in the current subframe is 1, and the hopped UE1 corresponds to the CSF of 100. From Table 1, it can be seen that the RB in the current subframe corresponds to the bearer. The subcarrier set of the DMRS of the UE1 is an even subcarrier, and the CSF of the hopped UE2 is 101. It can be seen from Table 1 that the subcarrier set of the DMRS carrying the UE2 in the RB corresponding to the current subframe is an even subcarrier, but The DMRSs of UE1 and UE2 are orthogonalized by OCC, so that the DMRSs of UE1 and UE2 are still orthogonal after hopping.

It should be noted that, in the present application, the CSF corresponding to the DRMS of the current subframe may be the same as or different from the CSF determined according to the preset rule. If they are the same, it means that the CS, OCC and subcarrier sets of the DMRS do not change.

It can be understood that, in the present application, the DMRS of the multiplexed UE is orthogonally implemented by different implementations of the subcarrier set, and then orthogonally implemented by different combinations of subcarrier sets according to the manner of the present application; multiplexing the UE The DMRS is previously orthogonalized by the OCC, and then the hopping according to the manner of the present application can at least ensure that the first layer and the second layer between the multiplexed UEs are orthogonalized by OCC. In the latter case, the base station may only configure the UE to transmit the DMRSs of the first layer and the second layer.

S403: The base station determines, according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, the CSF corresponding to the DMRS of the current subframe.

The preset CSF hopping step size is 4, the random variable is generated according to a preset random sequence, and the current subframe is a subframe of the DMRS sent by the receiving UE.

Specifically, similar to S401, the base station according to the formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

In a possible implementation manner, the base station according to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

In another possible implementation manner, the base station according to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

In yet another possible implementation, the base station according to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In this step, the preset rule may be: a CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or, the DMRS corresponding to the subframe of the SPS initial transmission The CSF corresponding to the DMRS of the subframe in which the first transmission is performed in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or the preset CSF.

S404: The base station receives the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe.

Specifically, the base station may determine, according to the mapping table of the CSF, the CS, the OCC, and the subcarrier set, and the CSF corresponding to the DMRS of the current subframe, the CSF mapping CS and the OCC corresponding to the DMRS of the current subframe; according to the DMRS base sequence, and the current The CSF mapped CS and the OCC corresponding to the DMRS of the subframe generate the DMRS.

After generating the DMRS, the base station compares it with the received DMRS to perform channel estimation.

The DMRS transmission method provided by the present application determines, by the UE, the CSF corresponding to the DMRS of the current subframe according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, where the preset CSF hopping step The length is 4, and the random variable is generated according to a preset random sequence, and the DMRS is sent to the base station according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe. When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared with the DMRS of the multiplexed UE, the DMRS is multiplexed according to the static or pseudo-random pattern, and the DMRSs that are originally orthogonal to each other when the UE performs the last uplink MU-MIMO transmission are used in the uplink MU-MIMO transmission of the current subframe. The method of the present application can ensure that the base station can correctly distinguish the DMRSs of different UEs when the DMRSs of different UEs are received, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of channel estimation. The uplink throughput of the UE is improved.

FIG. 5 is a schematic structural diagram of Embodiment 1 of a UE provided by the present application. As shown in FIG. 5, the UE 50 provided by the embodiment of the present application includes: a transceiver 51; a memory 52 for storing instructions; and a processor 53, respectively connected to the memory 52 and the transceiver 51, for executing instructions to execute Perform the following steps when instructing:

Determining a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule; wherein, the preset CSF hopping step size is 4, and the random variable is according to a preset Random sequence generation; transmitting DMRS to the base station according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe.

Specifically, in determining an aspect of the CSF corresponding to the DMRS of the current subframe according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, the processor 53 is configured to: according to the formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

Optionally, the processor 53 is further configured to:

According to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the processor 53 is further configured to:

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the processor 53 is further configured to:

According to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible implementation manner, in determining the CSF according to a preset rule, the preset rule is: a CSF corresponding to a DMRS of a previous subframe of a current subframe, where the previous subframe is a DMRS that sends the DMRS. a sub-frame; or a CSF corresponding to the DMRS of the subframe in which the SPS is initially transmitted; or a CSF corresponding to the DMRS of the subframe in which the first transmission is performed in the HARQ; or a DMRS corresponding to the subframe of the first retransmission in the HARQ CSF; or, the default CSF.

Optionally, in the aspect that the DMRS is sent to the base station according to the CS, the OCC, and the subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe, the processor 53 is configured to: according to the mapping relationship between the CSF, the CS, the OCC, and the subcarrier set. And the CSF corresponding to the DMRS of the current subframe determines the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe; and generates the DMRS according to the DMRS base sequence, the CSF mapped CS corresponding to the DMRS of the current subframe, and the OCC. Sending on the CSF mapped subcarrier set corresponding to the DMRS of the current subframe DMRS.

The UE provided by the present application is specifically configured to perform the steps of S401 and S402 in the embodiment shown in FIG. 4, and the implementation process and technical principles are similar, and details are not described herein again.

The UE provided by the present application includes: a transceiver; a memory for storing an instruction; and a processor connected to the memory and the transceiver, respectively, for executing an instruction to perform the following steps when executing the instruction: according to a preset The CSF hopping step size, the random variable, and the CSF determined according to the preset rule determine the CSF corresponding to the DMRS of the current subframe; wherein, the preset CSF hopping step size is 4, and the random variable is generated according to the preset random sequence; The DMRS is transmitted to the base station according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe. When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared with the DMRS of the multiplexed UE, the DMRS is multiplexed according to the static or pseudo-random pattern, and the DMRSs that are originally orthogonal to each other when the UE performs the last uplink MU-MIMO transmission are used in the uplink MU-MIMO transmission of the current subframe. The UE of the present application can ensure that the base station can correctly distinguish the DMRSs of different UEs when the DMRSs of different UEs are received, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of the channel estimation. The uplink throughput of the UE is improved.

FIG. 6 is a schematic structural diagram of Embodiment 1 of a base station provided by the present application. As shown in FIG. 6, the base station 60 provided by the present application includes: a transceiver 61; a memory 62 for storing instructions; and a processor 63 connected to the memory 62 and the transceiver 61 for executing instructions for executing instructions. Perform the following steps:

Determining a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, where the preset CSF hopping step size is 4, and the random variable is according to a preset The random sequence is generated, and the current subframe is a subframe of the DMRS that is sent by the UE, and the DMRS is received according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe.

Specifically, in an aspect of determining a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step, a preset random sequence, and a CSF determined according to a preset rule, the processor 63 is configured to: according to a formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

Optionally, the processor 63 is further configured to:

According to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the processor 63 is further configured to:

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the processor 63 is further configured to:

According to the formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

In a possible implementation, the preset rule is: the CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or the subframe for the initial transmission of the SPS The CSF corresponding to the DMRS; or the CSF corresponding to the DMRS of the subframe in which the first transmission is performed in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or the preset CSF.

The base station provided by the present application is specifically configured to perform the steps of S403 and S404 in the embodiment shown in FIG. 4, and the implementation process and technical principles are similar, and details are not described herein again.

The base station provided by the present application includes: a transceiver; a memory for storing an instruction; a processor connected to the memory and the transceiver, respectively, for executing an instruction to perform the following steps when executing the instruction: according to a preset The CSF hopping step size, the random variable, and the CSF determined according to the preset rule determine the CSF corresponding to the DMRS of the current subframe, where the preset CSF hopping step size is 4, and the random variable is generated according to the preset random sequence. The current subframe is a subframe that receives the DMRS sent by the UE; and receives the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe. When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared with the DMRS of the multiplexed UE, the DMRS is multiplexed according to the static or pseudo-random pattern, and the DMRSs that are originally orthogonal to each other when the UE performs the last uplink MU-MIMO transmission are used in the uplink MU-MIMO transmission of the current subframe. The base station of the present application can ensure that the base station can correctly distinguish the DMRSs of different UEs when the DMRSs of different UEs are received, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of channel estimation. The uplink throughput of the UE is improved.

FIG. 7 is a schematic structural diagram of Embodiment 2 of a UE provided by the present application. As shown in FIG. 7, the UE 70 provided by the present application includes:

The first determining module 71 is configured to determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of the current subframe. The preset CSF hopping step size is 4, and the random variable is generated according to a preset random sequence.

The sending module 72 is configured to send the DMRS to the base station according to the CS, OCC, and subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe.

Specifically, the first determining module 71 is specifically configured to: according to a formula

The CSF corresponding to the DMRS of the current subframe is determined. Wherein, n _PN (x) is a random variable,

For random variables, numbered

The value of the sub-frame,

For absolute subframe numbering,

Optionally, the UE 70 further includes:

a second determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the UE 70 further includes:

a third determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the UE 70 further includes:

Fourth determining module for formulating according to formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

Optionally, the preset rule is: the CSF corresponding to the DMRS of the previous subframe of the current subframe, where the previous subframe is a subframe for transmitting the DMRS; or the CSF corresponding to the DMRS of the subframe for the initial transmission of the SPS. Or, the CSF corresponding to the DMRS of the subframe transmitted for the first time in the HARQ; or the CSF corresponding to the DMRS of the subframe of the first retransmission in the HARQ; or the preset CSF.

In a possible implementation, the sending module 72 includes: a determining submodule, configured to determine, according to a mapping relationship between the CSF, the CS, the OCC, and the set of subcarriers, and the CSF corresponding to the DMRS of the current subframe, the DMRS corresponding to the current subframe. a CSF mapped CS, OCC, and subcarrier set; a generating submodule, configured to generate a DMRS according to a DMRS base sequence, a CSF mapped CS and an OCC corresponding to a DMRS of a current subframe; and a sending submodule for using the current subroutine The DMRS is transmitted on the CSF mapped subcarrier set corresponding to the DMRS of the frame.

The UE provided by the present application includes: a first determining module, configured to determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe, where The preset CSF hopping step size is 4, and the random variable is generated according to a preset random sequence, and the sending module is configured to send the DMRS to the base station according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe. . When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared to the DMRS of the multiplexed UE, after hopping according to a static or pseudo-random pattern, The multiplexing of the DMRSs that are originally orthogonal to each other in the uplink MU-MIMO transmission of the UE does not guarantee a certain orthogonal scheme in the uplink MU-MIMO transmission of the current subframe. The UE of the present application can make the base station receive different The DMRS of the UE can be correctly distinguished, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of the channel estimation and, in turn, improving the uplink throughput of the UE.

FIG. 8 is a schematic structural diagram of Embodiment 2 of a base station provided by the present application. As shown in FIG. 8, the base station 80 provided by the present application includes:

The first determining module 81 is configured to determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of the current subframe. The preset CSF hopping step size is 4, the random variable is generated according to a preset random sequence, and the current subframe is a subframe of the DMRS sent by the receiving UE.

The receiving module 82 is configured to receive the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe.

Specifically, the first determining module 81 is specifically configured to: according to a formula

Numbered as a random variable

The value of the sub-frame,

For absolute subframe numbering,

Optionally, the base station 80 further includes:

a second determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the base station 80 further includes:

a third determining module for using a formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of the time.

Optionally, the base station 80 further includes:

Fourth determining module for formulating according to formula

Determine the random variable numbered as

The value of the sub-frame. Where c(y) is a preset random sequence,

For the preset random sequence at

The value of time, r is the preset parameter.

The base station provided by the present application includes: a first determining module, configured to determine, according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe, where The preset CSF hopping step size is 4, the random variable is generated according to a preset random sequence, the current subframe is a subframe of the DMRS sent by the receiving UE, and the receiving module is configured to perform CSF mapping according to the DMRS of the current subframe. The CS, OCC, and subcarrier sets receive the DMRS. When the multiplexed UE is multiplexed by using the uplink MU-MIMO transmission in the previous transmission, the DMRS is orthogonal, and if the current subframe is still multiplexed by the uplink MU-MIMO transmission, the method provided by the present application is provided. In the DMRS transmission mode, the multiplexed UE determines the CSF corresponding to the DMRS of the current subframe, and transmits the DMRS according to the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe, and still maintains the DMRS of the multiplexed UE. Orthogonal between. Compared with the DMRS of the multiplexed UE, the DMRS is multiplexed according to the static or pseudo-random pattern, and the DMRSs that are originally orthogonal to each other when the UE performs the last uplink MU-MIMO transmission are used in the uplink MU-MIMO transmission of the current subframe. The base station of the present application can ensure that the base station can correctly distinguish the DMRSs of different UEs when the DMRSs of different UEs are received, so that the performance of the base station is improved when the PUSCH and the PUCCH are demodulated, thereby improving the accuracy of channel estimation. The uplink throughput of the UE is improved.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Claims

A method for transmitting a demodulation reference signal DMRS, comprising:

The user equipment UE determines the CSF corresponding to the DMRS of the current subframe according to the preset cyclic shift domain CSF hopping step size, the random variable, and the CSF determined according to the preset rule; wherein the preset CSF hopping step size Is 4, the random variable is generated according to a preset random sequence;

The UE sends the DMRS to the base station according to the cyclic shift CS, the orthogonal cover code OCC, and the subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe.
The method according to claim 1, wherein the UE determines the CSF corresponding to the DMRS of the current subframe according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, including:

The UE according to the formula
Determining the corresponding DMRS CSF current sub-frame; wherein, n PN (x) is the random variable,
Numbered for the random variable
The value of the sub-frame,
For absolute subframe numbering,
n f is the radio frame number, j is the subframe number in one radio frame, and CSF init is the CSF determined according to the preset rule.
The method of claim 2, wherein the method further comprises:

The UE according to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The method of claim 2, wherein the method further comprises:

The UE according to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The method of claim 2, wherein the method further comprises:

The UE according to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of time, r is the preset parameter.
The method according to any one of claims 1 to 5, wherein the preset rule is:

a CSF corresponding to a DMRS of a previous subframe of the current subframe, where the previous subframe is a subframe for transmitting a DMRS; or

Semi-statically scheduling the CSF corresponding to the DMRS of the subframe in which the SPS is initially transmitted; or

Hybrid automatic repeat request CSF corresponding to the DMRS of the subframe transmitted for the first time in HARQ; or

The CSF corresponding to the DMRS of the subframe that is retransmitted for the first time in HARQ; or,

The default CSF.
The method according to any one of claims 1-6, wherein the UE is according to the current subframe The CS, the OCC, and the set of subcarriers corresponding to the CSF mapping of the DMRS, and sending the DMRS to the base station, including:

Determining, by the UE, the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe according to the mapping relationship between the CSF, the CS, the OCC and the subcarrier set, and the CSF corresponding to the DMRS of the current subframe;

Generating, by the UE, the DMRS according to a DMRS base sequence, the CSF mapping CS corresponding to the DMRS of the current subframe, and an OCC;

The UE sends the DMRS on a CSF mapped subcarrier set corresponding to the DMRS of the current subframe.
A method for transmitting a demodulation reference signal DMRS, comprising:

Determining, by the base station, the CSF corresponding to the DMRS of the current subframe according to the preset cyclic shift domain CSF hopping step size, the random variable, and the CSF determined according to the preset rule; wherein the preset CSF hopping step size is 4 The random variable is generated according to a preset random sequence, where the current subframe is a subframe of the DMRS that is sent by the user equipment UE;

The base station receives the DMRS according to the cyclic shift CS, the orthogonal cover code OCC, and the set of subcarriers of the CSF mapping corresponding to the DMRS of the current subframe.
The method according to claim 8, wherein the base station determines the CSF corresponding to the DMRS of the current subframe according to the preset CSF hopping step size, the random variable, and the CSF determined according to the preset rule, including:

The base station according to a formula
Determining a CSF corresponding to a DMRS of the current subframe; wherein n PN (x) is the random variable,
Numbered for the random variable
The value of the sub-frame,
For absolute subframe numbering,
n f is the radio frame number, j is the subframe number in one radio frame, and CSF init is the CSF determined according to the preset rule.
The method of claim 9 wherein the method further comprises:

The base station according to a formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The method of claim 9 wherein the method further comprises:

The base station according to a formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The method of claim 9 wherein the method further comprises:

The base station according to a formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of time, r is the preset parameter.
The method according to any one of claims 8 to 12, wherein the preset rule is:

a CSF corresponding to a DMRS of a previous subframe of the current subframe, where the previous subframe is a subframe for transmitting a DMRS; or

Semi-statically scheduling the CSF corresponding to the DMRS of the subframe in which the SPS is initially transmitted; or

Hybrid automatic repeat request CSF corresponding to the DMRS of the subframe transmitted for the first time in HARQ; or

The CSF corresponding to the DMRS of the subframe that is retransmitted for the first time in HARQ; or,

The default CSF.
A user equipment (UE), comprising:

transceiver;

a memory for storing instructions;

a processor, coupled to the memory and the transceiver, for executing the instructions to perform the following steps when executing the instructions:

Determining, according to a preset cyclic shift domain CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe, where the preset CSF hopping step size is 4, The random variable is generated according to a preset random sequence;

And transmitting, according to the cyclic shift CS, the orthogonal cover code OCC, and the subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe, to the DMRS.
The UE according to claim 14, wherein the processing is performed on a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule. Used for:

According to the formula
Determining a CSF corresponding to a DMRS of the current subframe; wherein n PN (x) is the random variable,
Numbered for the random variable
The value of the sub-frame,
For absolute subframe numbering,
n f is the radio frame number, j is the subframe number in one radio frame, and CSF init is the CSF determined according to the preset rule.
The UE according to claim 15, wherein the processor is further configured to:

According to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The UE according to claim 15, wherein the processor is further configured to:

According to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The UE according to claim 15, wherein the processor is further configured to:

According to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of time, r is the preset parameter.
The UE according to any one of claims 14 to 18, wherein the preset rule is:

a CSF corresponding to a DMRS of a previous subframe of the current subframe, where the previous subframe is a subframe for transmitting a DMRS; or

Semi-statically scheduling the CSF corresponding to the DMRS of the subframe in which the SPS is initially transmitted; or

Hybrid automatic repeat request CSF corresponding to the DMRS of the subframe transmitted for the first time in HARQ; or

The CSF corresponding to the DMRS of the subframe that is retransmitted for the first time in HARQ; or,

The default CSF.
The UE according to any one of claims 14 to 19, wherein the DMRS is transmitted to the base station according to the CS, OCC, and subcarrier sets mapped by the CSF corresponding to the DMRS of the current subframe. The processor is used to:

Determining, by the CSF, the CS, the mapping relationship between the OCC and the set of subcarriers, and the CSF corresponding to the DMRS of the current subframe, the CS, OCC, and subcarrier sets of the CSF mapping corresponding to the DMRS of the current subframe;

Generating the DMRS according to a DMRS base sequence, the CSF mapped CS corresponding to the DMRS of the current subframe, and an OCC;

Transmitting the DMRS on a CSF mapped subcarrier set corresponding to the DMRS of the current subframe.
A base station, comprising:

transceiver;

a memory for storing instructions;

a processor, coupled to the memory and the transceiver, for executing the instructions to perform the following steps when executing the instructions:

Determining, according to a preset cyclic shift domain CSF hopping step size, a random variable, and a CSF determined according to a preset rule, a CSF corresponding to a DMRS of a current subframe, where the preset CSF hopping step size is 4, The current subframe is a subframe of a DMRS that is sent by the user equipment UE;

And receiving the DMRS according to the cyclic shift CS, the orthogonal cover code OCC, and the subcarrier set of the CSF mapping corresponding to the DMRS of the current subframe.
The base station according to claim 21, wherein the processing is performed on a CSF corresponding to a DMRS of a current subframe according to a preset CSF hopping step size, a random variable, and a CSF determined according to a preset rule. Used for:

According to the formula
Determining the corresponding DMRS CSF current sub-frame; wherein, n PN (x) is the random variable,
Numbered for the random variable
The value of the sub-frame,
For absolute subframe numbering,
n f is the radio frame number, j is the subframe number in one radio frame, and CSF init is the CSF determined according to the preset rule.
The base station according to claim 22, wherein the processor is further configured to:

According to the formula
Determining that the random variable is numbered
The value of the subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The base station according to claim 22, wherein the processor is further configured to:

According to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of the time.
The base station according to claim 22, wherein the processor is further configured to:

According to the formula
Determining that the random variable is numbered
a value of a subframe; wherein c(y) is the preset random sequence,
For the preset random sequence
The value of time, r is the preset parameter.
The base station according to any one of claims 21-25, wherein the preset rule is:

a CSF corresponding to a DMRS of a previous subframe of the current subframe, where the previous subframe is a subframe for transmitting a DMRS; or

Semi-statically scheduling the CSF corresponding to the DMRS of the subframe in which the SPS is initially transmitted; or

Hybrid automatic repeat request CSF corresponding to the DMRS of the subframe transmitted for the first time in HARQ; or

The CSF corresponding to the DMRS of the subframe that is retransmitted for the first time in HARQ; or,

The default CSF.