WO2019158036A1

WO2019158036A1 - Method and apparatus for determining reference signal pattern

Info

Publication number: WO2019158036A1
Application number: PCT/CN2019/074815
Authority: WO
Inventors: 石靖; 夏树强; 梁春丽; 韩祥辉; 任敏; 林伟
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-02-13
Filing date: 2019-02-12
Publication date: 2019-08-22
Also published as: CN110166199A

Abstract

The present invention provides a method and apparatus for determining a reference signal pattern. The method comprises: determining a demodulation reference signal (DMRS) offset pattern, wherein the DMRS offset pattern is a pattern of a preset pattern with respect to DMRS offset of a long-term evolution (LTE)/long-term evolution advanced (LTE-A) system.

Description

Method and device for determining reference signal pattern

The present disclosure claims priority to Chinese Patent Application No. 20110115015, filed on Jan. 13, 2018, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of communication technologies, for example, to a method and apparatus for determining a reference signal pattern.

Background technique

The 4th Generation mobile communication technology (4G) Long-Term Evolution (LTE)/Long-Term Evolution Advance (LTE-Advance/LTE-A) and the fifth generation mobile The 5th Generation mobile communication technology (5G) faces increasing demands. Both 4G and 5G systems are researching features that support enhanced mobile broadband, ultra-high reliability, ultra-low latency transmission, and massive connectivity.

In order to support the characteristics of ultra-high reliability and ultra-low latency transmission, it is required to transmit low-latency and high-reliability services at short transmission time intervals. Due to the limited resources in the LTE system, all or most of the resources in a sub-frame are occupied by the legacy user equipment (legacy UE). In this case, the short transmission time interval is not the first in the sub-frame. Interval, sTTI) arrives at the data of the Ultra Reliable & Low Latency Communicaiton (URLLC) service. In order to ensure the low latency and high reliability of the data, one way is to allow the URLLC service to preempt the legacy UE for transmission. Resources, but considering the performance of the legacy UE, it is necessary to avoid preempting the resources occupied by the legacy UE's Demodulation Reference Signal (DMRS), so that the legacy UE can obtain the channel estimation result through the DMRS, thereby providing the demodulated data correctly. Possibly, if the resources occupied by the DMRS of the legacy UE are preempted by the URLLC service, the legacy UE cannot obtain an accurate channel estimation and cannot correctly demodulate the data, thereby reducing system efficiency.

For the URLLC service, the data part may rate match the DMRS of the legacy UE, but the DMRS used by the URLLC may collide with the DMRS of the legacy UE. The DMRS used by the URLLC collides with the DMRS of the legacy UE, which results in a lower system spectrum efficiency.

Summary of the invention

The present disclosure provides a method and apparatus for determining a reference signal pattern to at least solve the problem of low spectral efficiency of a system caused by a collision between a DMRS used by a URLLC service and a DMRS of a legacy UE in the related art.

The present disclosure provides a method for determining a reference signal pattern, including: determining a demodulation reference signal DMRS offset pattern, wherein the DMRS offset pattern is a preset pattern relative to a Long Term Evolution LTE/Enhanced Long Term Evolution (LTE-A) system The pattern after the DMRS offset.

The present disclosure further provides a determining device for determining a reference signal pattern, comprising: a first determining module, configured to determine a demodulation reference signal DMRS offset pattern, wherein the DMRS offset pattern is a preset pattern relative to Long Term Evolution (LTE) / Enhance the DMRS offset pattern of the Long Term Evolution LTE-A system.

The present disclosure also provides a storage medium having stored therein a computer program, wherein the computer program is configured to perform a determination method of any one of the above-described reference signal patterns at runtime.

The present disclosure also provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, the processor being arranged to execute the computer program to perform a determination method of any one of the reference signal patterns described above.

DRAWINGS

1 is a block diagram showing a hardware structure of a mobile terminal for determining a reference signal pattern according to an embodiment;

2 is a flow chart of a method for determining a reference signal pattern according to an embodiment;

FIG. 3 is a schematic diagram of an LTE DMRS pattern according to an embodiment; FIG.

4 is a DL sub-slot sTTI pattern provided by an embodiment;

FIG. 5 is a baseline DMRS pattern provided by an embodiment;

6 is a DMRS shift pattern provided by an embodiment;

7 is a sub-slot sTTI shift DMRS pattern provided by an embodiment;

FIG. 8 is another DMRS shift pattern provided by an embodiment; FIG.

FIG. 9 is another DMRS shift pattern provided by an embodiment; FIG.

FIG. 10 is a structural block diagram of a determining apparatus for determining a reference signal according to an embodiment; FIG.

FIG. 11 is a structural block diagram of another apparatus for determining a reference signal pattern according to an embodiment.

Detailed ways

The present disclosure will be hereinafter described with reference to the drawings in conjunction with the embodiments.

The terms "first", "second" and the like in the specification and claims of the present disclosure and the above-mentioned figures are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

The method embodiment provided by this embodiment may be implemented in a mobile terminal, a computer terminal or the like. This embodiment takes an example of running on a mobile terminal. FIG. 1 is a block diagram showing the hardware structure of a mobile terminal for determining a reference signal pattern according to an embodiment. As shown in FIG. 1, mobile terminal 10 may include one or more (only one of which is shown in FIG. 1) processor 102 (processor 102 may include, but is not limited to, a Microcontroller Unit (MCU) or a programmable logic device. A processing device such as a Field-Programmable Gate Array (FPGA) and a memory 104 provided to store data. In an embodiment, the mobile terminal may further include a transmission device 106 configured as a communication function and an input and output device 108. It will be understood by those skilled in the art that the structure shown in FIG. 1 is merely illustrative and does not limit the structure of the above mobile terminal. For example, the mobile terminal 10 may also include more or fewer components than those shown in FIG. 1, or have a different configuration than that shown in FIG.

The memory 104 may be configured to store a computer program, such as a software program of a application software and a module, such as a computer program corresponding to the determination method of the reference signal pattern in the embodiment, the processor 102 running the computer program stored in the memory 104, Thereby performing at least one functional application and data processing, ie implementing the above method. Memory 104 may include high speed random access memory, and may also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 104 can include memory remotely located relative to processor 102, which can be connected to mobile terminal 10 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 106 is arranged to receive or transmit data via a network. The network instance described above may include a wireless network provided by a communication provider of the mobile terminal 10. In one example, transmission device 106 includes a network interface controller (NIC) that can be coupled to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 can be a Radio Frequency (RF) module, and the transmission device 106 is configured to communicate with the Internet wirelessly.

2 is a flow chart of a method for determining a reference signal pattern according to an embodiment. As shown in FIG. 2, the process includes the following steps.

Step S202, determining a demodulation reference signal DMRS offset pattern, where the DMRS offset pattern is a pattern of the preset pattern relative to the DMRS offset of the Long Term Evolution (LTE)/Enhanced Long Term Evolution (LTE) system.

In this embodiment, the preset pattern may be a DMRS pattern used in a sub-slot sTTI in a Short Transmission Time Interval (TTI), and there are two DMRS patterns, respectively Baseline DMRS pattern and sub-slot sTTI shift DMRS (sub-slot shift DMRS) pattern.

In an embodiment, the execution body of the foregoing steps may be a base station, a terminal, or the like, but is not limited thereto.

Through the foregoing step S202, a demodulation reference signal DMRS offset pattern is determined, wherein the DMRS offset pattern is a pattern of the preset pattern relative to the DMRS offset of the Long Term Evolution (LTE)/Enhanced Long Term Evolution (LTE) system. In other words, by determining the DMRS offset pattern, the LMRS resource is preempted by the URLLC, and the DMRS resource of the legacy UE is prevented from being preempted, so that the legacy UE can obtain an accurate channel estimation, thereby solving the DMRS used by the URLLC in the related art. The problem of lower spectral efficiency of the system caused by collision with the legacy UE's DMRS achieves the technical effect of improving the spectral efficiency of the system.

In one embodiment, the above method further comprises the following steps.

Step S110: Determine, according to at least one of the following manners, the use of the DMRS offset pattern: Radio Resource Control (RRC) signaling configuration, Downlink Control Information (DCI) indication, and preset rules.

The DMRS resource of the legacy UE is prevented from being preempted by the URLLC, and the legacy UE can obtain an accurate channel estimation, thereby solving the DMRS used by the URLLC and the DMRS of the legacy UE in the related art. The problem of low spectral efficiency of the system caused by collisions has achieved the technical effect of improving the spectral efficiency of the system.

In an embodiment, in the case that the preset pattern is a baseline pattern, the frequency domain subcarrier position occupied by the DMRS offset pattern includes at least one of the following: port 7/8 is in two physical resource blocks. The subcarrier positions occupied by the PRB (for example, PRB0, PRB1) are respectively k=3, 8 in PRB0, k=3, 9 in PRB1; the subcarrier positions occupied by port 9/10 in 2 PRBs are respectively k=2, 7 in PRB0, k=2, 8 in PRB1; the subcarrier positions occupied by port 7/8 in 2 PRBs are k=3, 9 in PRB0, respectively, k= in

PRB1

3, 9; the subcarrier positions occupied by port 9/10 in 2 PRBs are k=2, 8 in PRB0, k=2, 8 in PRB1, and port 7/8 is occupied in 2 PRBs. The subcarrier positions are k=2, 8 in PRB0, and k=3, 10 in PRB1; the subcarrier positions occupied by port 9/10 in 2 PRBs are k=0, 7 in PRB0, respectively. k=2, 9 in PRB1; where k is a subcarrier number index in a PRB, and the value is 0-11.

In an embodiment, in a case where the preset pattern is a sub-slot shift DMRS pattern, the frequency domain subcarrier position occupied by the DMRS offset pattern includes at least one of the following: when the offset value When vshift=0, the subcarrier positions occupied by port 7/8 in 2 PRBs are k=4, 8 in PRB0, k=4, 8 in PRB1, and 9/10 in 2 PRBs. The occupied subcarrier positions are k=2, 7 in PRB0, and k=2, 7 in PRB1. When the offset value vshift=1, the subcarrier positions occupied by port 7/8 in 2 PRBs are respectively k=3, 9 in PRB0, k=3, 9 in PRB1; the subcarrier positions occupied by port 9/10 in 2 PRBs are k=2, 8 in PRB0, and k=2 in PRB1, respectively. 8; when the offset value vshift=2, the subcarrier positions occupied by port 7/8 in 2 PRBs are k=4, 9 in PRB0, k=4, 9 in PRB1; port 9/ 10 The subcarrier positions occupied by the two PRBs are respectively k=3, 7 in PRB0, and k=3, 7 in PRB1; wherein k is a subcarrier number index in a PRB, and the value is 0- 11.

In an embodiment, in the case that the preset pattern is a micro-slot offset sub-slot shift DMRS pattern, the frequency domain subcarrier position occupied by the DMRS offset pattern includes at least one of the following: When vshift=0, the subcarrier positions occupied by port 7/8 in 2 PRBs are k=4, 8 in PRB0, k=4, 10 in PRB1, and 9/10 in 2 PRBs. The occupied subcarrier positions are k=2, 7 in PRB0, and k=2, 8 in PRB1. When the offset value vshift=1, the subcarrier positions occupied by port 7/8 in 2 PRBs are respectively k=2, 8 in PRB0, k=3, 9 in PRB1; the subcarrier positions occupied by port 9/10 in 2 PRBs are k=0, 5 in PRB0, and k=2 in PRB1, respectively. 8 when the offset value vshift=2, the subcarrier positions occupied by the port 7/8 in the two PRBs are k=3, 9 in PRB0, k=3, 10 in PRB1, and port 9/ 10 The subcarrier positions occupied by the two PRBs are respectively k=0, 7 in PRB0, and k=0, 9 in PRB1; wherein k is a subcarrier number index in a PRB, and the value is 0- 11.

In the embodiment, the vshift is an offset value used when generating a cell-specific reference signal (CRS) pattern, and the value includes 0, 1, and 2.

In an embodiment, determining the use of the DMRS offset pattern according to the RRC signaling configuration and/or the DCI indication comprises one of: using 1 bit in the RRC signaling configuration to indicate that the use is relative to the LTE DMRS. The shifted pattern or using a pattern that is not offset with respect to the LTE DMRS; using 1 bit in the DCI indication to indicate that the offset is used with respect to the LTE DMRS or the offset is not used with respect to the LTE DMRS pattern.

In an embodiment, determining, according to the preset rule, that the use of the DMRS offset pattern comprises at least one of: only sTTI#2 uses the DMRS offset pattern; sTTI#2 and sTTI#4 use the DMRS offset pattern; All sTTIs use the DMRS offset pattern; the configured or indicated sTTI uses the DMRS offset pattern; the sTTI without the cell-specific pilot CRS or the configured Channel State Information-Reference Signals (CSI) -RS) The DMRS offset pattern is used by the non-conflicting sTTI; the DMRS offset pattern is used only by sTTI#5; the DMRS offset pattern is used by sTTI#1 and sTTI#5; the DMRS offset cannot be used by the sTTI of the baseline pattern pattern.

In an embodiment, in the case that the preset pattern is a reference baseline pattern, the DMRS offset pattern is only used for sTTI#2, or for sTTI#2 and sTTI#4, or all sTTIs use the DMRS shift pattern. Or sTTI for configuration or indication, or for sTTI without CRS or sTTI that does not conflict with configured CSI-RS.

In an embodiment, where the preset pattern is a micro-slot offset sub-slot shift DMRS pattern, the DMRS offset pattern is only used for sTTI#5, or for sTTI#1 and sTTI#5, Or all sTTIs use the DMRS shift pattern, or sTTI for configuration or indication, or sTTI for which a baseline pattern cannot be used.

The present embodiment will be exemplified below with reference to specific examples.

The above background description of the present disclosure is only one case, but is not limited thereto. The method provided in this embodiment can also be used in the case that the LTE system supports the collision of the service transmission of the enhanced mobile broadband (eMBB) terminal and the URLLC terminal, and the URLLC avoids preempting the DMRS of the eMBB. It can also be used in the case where the eMBB-enabled terminal collides with the service transmission of the URLLC terminal in the 5G New Radio (NR) system, and the URLLC avoids preempting the DMRS of the eMBB. It can also be used in the LTE system to preempt the short TTI service, for example, to preempt the 1-slot TTI. In this case, the URLLC avoids preempting the DMRS used by the 1-slot service.

In the case of the LTE system and the normal Cyclic Prefix (NCP), the DMRS pattern used by the Physical Downlink Shared Channel (PDSCH) with the subframe as the transmission unit occupies resources in the frequency domain. 3, that is, occupying subcarriers k=0, 1, 5, 6, 10, 11 in 12 subcarriers in one physical resource block (PRB), wherein port 7/8 occupies k=1, 6, 11, port 9/10 occupies k=0, 5, 10. The last two symbols of the DMRS in each time slot on the time domain.

The URLLC service is implemented in an LTE system, for example, based on a short TTI. For sub-slot sTTI, there are two DMRS patterns based on DMRS transmission, which are called baseline DMRS pattern and sub-slot sTTI shift DMRS pattern. Therefore, how to describe the two DMRS patterns are described below through two embodiments. Avoid preempting the legacy UE's DMRS, that is, how to offset.

Exemplary embodiment 1

The base station scheduling terminal A repeatedly transmits downlink data in the TTI, and uses a Short Physical Downlink Shared Channel (sPDSCH) channel. In this embodiment, the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols included in the TTI is small, for example, not more than 7 OFDM symbols, but is not limited thereto. This embodiment is described in the short TTI structure in the LTE system, that is, the TTI is a short TTI (sort TTI, sTTI), but is not limited thereto. The downlink (DL) short TTI frame structure is as shown in FIG. 4, and includes 6 DL short TTIs (also referred to as sub-slots) in a 1 millisecond (ms) subframe, when the sPDSCH is configured as the OFDM symbol #1. When #3 is started, Pattern1 is used; when sPDSCH is configured to start from OFDM symbol #2, Pattern2 is used. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

At this time, the service of the terminal A is a URLLC service, and at this time, the sPDSCH is configured to use a DMRS based (DMRS based) transmission mode. At the same time, the legacy UE B is already transmitting the Physical Downlink Shared Channel (PDSCH) service and occupies all or most of the frequency domain resources. In this case, there is not enough resources for transmitting the URLLC service of the terminal A. . To ensure the URLLC service requirement of the terminal A, the base station schedules the URL LC service of the terminal A to use the sPDSCH to preempt the downlink resources of the legacy UE B being transmitted. In order to enable the legacy UE to obtain an accurate channel estimate and thus provide the possibility of correctly demodulating the data, it is necessary to avoid preempting the legacy UE's DMRS.

Sub-slot The TTI DMRS is located in the first two symbols of the sTTI in the time domain. When the DMRS uses the baseline pattern, as shown in Figure 5, the Short TTI baseline DMRS occupies the subcarriers k = 0, 1, 7, 8 (PRB0) in 2 PRBs; k = 2, 3, 9, 10 (PRB1) . Port 7/8 occupies k=1, 8 (PRB0) and k=3, 10 (PRB1); port 9/10 occupies k=0, 7 (PRB0) and k=2, 9 (PRB1).

First, the premise that the baseline pattern can be used is that the sTTI has no CRS or does not conflict with the Channel State Information (CSI) configuration. In this case, only the LTE DMRS is offset.

In an embodiment, the foregoing offsetting the LTE DMRS may be to offset the LTE DMRS port 7/8/9/10, or only to the LTE DMRS Port 7/8. When only LTE DMRS Port 7/8 is offset, it means that the resources occupied by the LTE DMRS Port 9/10 can be punctured.

In an embodiment, the DMRS offset pattern is applicable to sTTI #2. In sTTI#2, there is no CRS, there is DMRS of LTE legacy UE, and there may be CSI-RS. Therefore, when the configured CSI-RS does not conflict with the baseline pattern, or when no CSI-RS is configured, the baseline pattern is used. The position where the baseline pattern collides with the LTE DMRS is k=0, 1 (PRB0); k=10 (PRB1).

In an embodiment, 4 transmit antennas (Transmit, Tx) are taken as an example (CSI configuration #0-9 is available), and CSI-

RS configuration #

0, 5 in sTTI#2 conflicts with the baseline pattern, and the remaining CSI configurations are configured. In sTTI#4/5, there is no conflict with sTTI#2 using the baseline pattern.

In order to avoid collision with LTE DMRS, since LTE DMRS occupies both ends of the PRB, the baseline pattern is inevitably concentrated internally when shifting.

The possible DMRS shift pattern at this time is one of Case 1 (alt. 1), Case 2 (alt. 2), and Case 3 (alt. 3) as shown in FIG. 6.

Alt.1: The subcarrier location of each DMRS in the baseline pattern collides with the subcarrier where the legacy UE's DMRS is located, and moves. For the subcarrier where each DMRS is located in the baseline pattern does not collide with the subcarrier where the legacy UE's DMRS is located. constant. That is, at this time, the DMRS shift pattern is that the subcarrier positions in the two PRBs occupied by port 7/8 are k=3, 8 (PRB0), k=3, 9 (PRB1); the port 9/10 occupies 2 PRBs. The subcarrier positions are k=2, 7 (PRB0), k=2, 8 (PRB1).

Alt.2: The moved DMRS pattern is kept at equal intervals in the frequency domain. That is, for the same port, the subcarrier position occupied by the port in the frequency domain is 1 subcarrier occupied in every 6 subcarriers. For example, by moving the DMRS position on the basis of the mode 1, the DMRS interval after the movement is more uniform, and the subcarriers occupied by the same port are separated by 5 subcarriers. In addition, the CSI-RS available configuration of Alt. 2 is more than the available configuration of the CSI-RS of Alt. That is, at this time, the DMRS shift pattern is that the subcarrier positions in the two PRBs occupied by port 7/8 are k=3, 9 (PRB0), k=3, 9 (PRB1); the port 9/10 occupies 2 PRBs. The subcarrier positions are k=2, 8 (PRB0), k=2, 8 (PRB1).

Alt.3: Only LTE DMRS Port 7/8 is offset, that is, the subcarrier position of each DMRS in the baseline pattern collides with the subcarrier where the legacy UE's DMRS Port 7/8 is located to move. That is, at this time, the DMRS shift pattern is that the subcarrier positions in the two PRBs occupied by port 7/8 are k=2, 8 (PRB0), k=3, 10 (PRB1); the port 9/10 occupies 2 PRBs. The subcarrier positions are k=0, 7 (PRB0), k=2, 9 (PRB1).

In an embodiment, in combination with the time domain location of the legacy UE DMRS, the DMRS shift pattern is only used for sTTI#2, or for sTTI#2 and sTTI#4, or all sTTIs use the DMRS shift pattern, or The sTTI configured or indicated, or used for sTTI without CRS or without conflict with the configured CSI-RS.

In an embodiment, whether the terminal uses the DMRS shift pattern is configured by the base station through RRC signaling, or the DCI indication, or the DMRS shift pattern is used by default. For example, in the case that the UE transmitting the URLLC uses the DMRS based transmission mode, whether to use the DMRS shift pattern at this time may be configured or indicated according to whether the legacy UE uses the DMRS based transmission mode, for example, whether the RRC configuration may be used, or according to the current Whether the PDSCH of the legacy UE actually preempted in the subframe uses the DMRS to dynamically indicate whether the URLLC UE uses the DMRS shift pattern. For example, when the sPDSCH carrying the URLLC service uses the DMRS based transmission mode and preempts the PDSCH resource of the legacy UE at sTTI#2, and the legacy UE uses the DMRS based transmission mode, the Evolved NodeB (eNB) dynamically indicates the DMRS usage of the sPDSCH. DMRS shift pattern.

The method for determining the reference signal pattern in the embodiment may be implemented to prevent the LTE legacy UE resource from being preempted by the URLLC, and to avoid preempting the legacy UE's DMRS resource, and ensuring that the legacy UE can obtain an accurate channel estimation. The simultaneously moved URLLC DMRS is used to provide channel estimation for the URLLC service. This ensures that the legacy UE obtains accurate channel estimation and thus provides the possibility of correctly demodulating the data while improving the performance of the URLLC, thereby improving the spectrum efficiency of the system.

Exemplary embodiment 2

The base station scheduling terminal A repeatedly transmits downlink data in the TTI, and uses the sPDSCH channel. In this embodiment, the TTI includes a small number of OFDM symbols, for example, no more than 7 OFDM symbols, but is not limited thereto. This embodiment is described in the short TTI structure in the LTE system, that is, the TTI is sTTI, but is not limited thereto. The DL short TTI frame structure is as shown in the sub-slot case of FIG. 4, and includes 6 DL short TTIs in a 1 ms subframe. When the sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when sPDSCH is When configured to start from OFDM symbol #2, use Pattern2. Note that the OFDM symbol number here starts from 0, that is, there are 14 OFDM symbols in the 1 ms subframe, and the sequence numbers are #0 to #13.

At this time, the service of the terminal A is a URLLC service, and at this time, the sPDSCH is configured to use the DMRS based transmission mode. At the same time, the legacy UE B is already transmitting the PDSCH service and occupies all or most of the frequency domain resources. In this case, there is not enough resources for transmitting the URLLC service of the terminal A. To ensure the URLLC service requirement of the terminal A, the base station schedules the URL LC service of the terminal A to use the sPDSCH to preempt the downlink resources of the legacy UE B being transmitted. In order to enable the legacy UE to obtain an accurate channel estimate and thus provide the possibility of correctly demodulating the data, it is necessary to avoid preempting the legacy UE's DMRS.

Sub-slot sTTI The DMRS is located in the first two symbols of the sTTI in the time domain. When the DMRS uses the offset pattern relative to the baseline pattern, as shown in Figure 7, the sub-slot sTTI shift DMRS pattern is the pattern after the baseline pattern is offset from the CRS, where vRS is taken at CRS= When 0, 1, 2 is determined, different offset patterns are determined.

First, the condition for using the sTTI shift DMRS pattern is that the sTTI cannot be used because of the existence of CRS or the configuration CSI-RS conflicts with the baseline pattern. In this case, the sTTI shift DMRS pattern needs to be offset from the LTE DMRS.

In an embodiment, the foregoing LTE DMRS is offset, and the LTE DMRS Port 7/8/9/10 may be offset, or only the LTE DMRS Port 7/8 may be offset. When only LTE DMRS Port 7/8 is offset, it means that the resources occupied by the LTE DMRS Port 9/10 can be punctured.

In an embodiment, the DMRS offset pattern is applicable to sTTI #5. In sTTI#5, there is CRS, there is DMRS of LTE legacy UE, and there may be CSI-RS. Therefore, sTTI#5 cannot use the baseline pattern in the non-Multimedia Broadcast Multicast Service Single Frequency Network (non-MBSFN) subframe, and uses the sTTI shift DMRS pattern. The location where the sTTI shift DMRS pattern conflicts with the LTE DMRS is as follows.

Vshift=0 sTTI shift The position where the DMRS pattern collides with the LTE DMRS is k=1(PRB0); k=10,11(RPB1); vshift=1 sTTI shift The position where the DMRS pattern collides with the LTE DMRS is k=0,6( PRB0);k=11(RPB1);vshift=2 sTTI shift The position where the DMRS pattern conflicts with the LTE DMRS is k=0,1(PRB0);k=1,10(RPB1)

In an embodiment, when the sTTI shift DMRS pattern at the vshift=0/1/2 is relative to the LTE DMRSshift, the offset pattern is at least one of the following: wherein, when vshift=0, the sTTI The shift DMRS pattern is relative to the LTE DMRS shift pattern. Port 7/8 occupies the subcarrier positions in the two PRBs as k=4, 8 (PRB0), k=4, 8 (PRB1); port 9/10 occupies 2 The subcarrier positions in the PRB are k=2, 7 (PRB0), k=2, 7 (PRB1). Wherein, when vshift=1, the sTTI shift DMRS pattern is compared with the LTE DMRS shift pattern, and the subcarrier positions in the two PRBs occupied by port 7/8 are k=3, 9 (PRB0), k=3, 9 (PRB1) ); port 9/10 occupies the subcarrier positions in the two PRBs as k=2, 8 (PRB0), k=2, 8 (PRB1). Wherein, when vshift=2, the sTTI shift DMRS pattern is compared with the LTE DMRS shift pattern, and the subcarrier positions in the two PRBs occupied by port 7/8 are k=4, 9 (PRB0), k=4, 9 (PRB1) ); port 9/10 occupies the subcarrier positions in 2 PRBs as k=3, 7 (PRB0), k=3, 7 (PRB1).

In an embodiment, when the sTTI shift DMRS pattern at the vshift=0/1/2 is only relative to the LTE DMRS Port 7/8 shift, the offset pattern is at least one of the following: When vshift=0, the sTTI shift DMRS pattern relative to the LTE DMRS Port 7/8 shift pattern is port 7/8 occupying the subcarrier positions in the two PRBs as k=4, 8 (PRB0), k=4, 10 ( PRB1); Port 9/10 occupies the subcarrier positions in 2 PRBs as k=2, 7 (PRB0), k=2, 8 (PRB1). Wherein, when vshift=1, the sTTI shift DMRS pattern is compared with the LTE DMRS Port 7/8 shift pattern, and the port position of the two PRBs occupied by port 7/8 is k=2, 8 (PRB0), k=3. , 9 (PRB1); port 9/10 occupies the subcarrier positions in the two PRBs as k=0, 5 (PRB0), k=2, 8 (PRB1). Wherein, when vshift=2, the sTTI shift DMRS pattern is compared with the LTE DMRS Port 7/8 shift pattern, and the port position of the two PRBs occupied by port 7/8 is k=3, 9 (PRB0), k=3. 10 (PRB1); the port 9/10 occupies the subcarrier positions in the two PRBs as k=0, 7 (PRB0), k=0, 9 (PRB1).

In an embodiment, in combination with the time domain location of the LTE DMRS, the DMRS shift pattern after the LTE DMRS offset is used only for sTTI#5, or for sTTI#1 and sTTI#5, or all sTTIs use the same DMRS shift pattern, either for configuration or indication of sTTI, or for sTTI that cannot use baseline pattern.

In an embodiment, whether the terminal uses the DMRS shift pattern is configured by the base station through RRC signaling, or the DCI indication, or the DMRS shift pattern is used by default. For example, if the UE transmitting the URLLC is using the DMRS based transmission mode, whether to use the DMRS shift pattern at this time may be configured or indicated according to whether the legacy UE uses the DMRS based transmission mode, for example, whether the RRC configuration may be used, or according to the current subframe. Whether the actually preempted legacy UE's PDSCH uses the DMRS to dynamically indicate whether the URLLC UE uses the DMRS shift pattern. For example, when the sPDSCH carrying the URLLC service uses the DMRS based transmission mode and preempts the PDSCH resource of the legacy UE at sTTI#5, and the legacy UE uses the DMRS based transmission mode, the eNB dynamically instructs the DMRS of the sPDSCH to use the DMRS shift pattern.

The method for determining the reference signal pattern in the embodiment may be implemented to prevent the legacy DMRS resource from being preempted by the URLLC, and to ensure that the legacy UE can obtain an accurate channel estimation, and the URLLC DMRS after the mobile station is moved. Channel estimation for providing URLLC services, so as to ensure the accuracy of the URL LC, the legacy UE can obtain accurate channel estimation to provide the possibility of correctly demodulating data, and improve the system spectrum efficiency.

Through the description of the above embodiments, those skilled in the art may understand that the method according to the foregoing embodiment may be implemented by means of software plus a general hardware platform, or may be implemented by hardware. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product stored in a storage medium (such as Read-Only Memory (ROM) / Random Access Memory (Random Access Memory). , RAM, disk, CD-ROM, including a plurality of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the method described in any of the embodiments of the present disclosure.

Example 2

A determining device for determining a reference signal pattern is also provided in the embodiment, and the device is used to implement the above-described embodiments, and the description thereof has been omitted. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the devices described in the following embodiments may be implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 10 is a structural block diagram of a device for determining a reference signal pattern according to an embodiment. As shown in FIG. 10, the device includes: a first determining module 102 configured to determine a DMRS offset pattern of a demodulation reference signal, where The DMRS offset pattern is a pattern of a preset pattern relative to a DMRS offset of a Long Term Evolution (LTE)/Enhanced Long Term Evolution (LTE-A) system.

In an embodiment, the preset pattern may be a DMRS pattern used in a sub-slot sTTI in the LTE short TTI. There are two types of DMRS patterns, namely a baseline DMRS pattern and a sub-slot sTTI shift DMRS pattern.

The demodulation reference signal DMRS offset pattern is determined by the apparatus shown in FIG. 10, wherein the DMRS offset pattern is a pattern of the preset pattern relative to the DMRS offset of the Long Term Evolution (LTE)/Enhanced Long Term Evolution (LTE) system. In other words, by determining the DMRS offset pattern, the LTE legacy UE resource is preempted while the legacy network resource is preempted, and the legacy DMRS resource is prevented from being preempted, so that the legacy UE can obtain an accurate channel estimation, thereby solving the DMRS and legacy used by the URLLC in the related art. The problem of low spectral efficiency of the system caused by the collision of the DMRS of the UE achieves the technical effect of improving the spectrum efficiency of the system.

FIG. 11 is a structural block diagram of another apparatus for determining a reference signal pattern according to an embodiment. As shown in FIG. 11, the device includes, in addition to the module shown in FIG. 10, a second determining module 112, configured to determine the use of the DMRS offset pattern according to at least one of the following manners: radio resource control RRC signaling Configuration, downlink control information DCI indication, and preset rules.

The apparatus shown in FIG. 11 is configured to prevent the preemption of legacy DMRS resources while ensuring that the URLLC preempts the LTE legacy UE resources, and ensures that the legacy UE can obtain an accurate channel estimation, thereby solving the DMRS used by the URLLC and the DMRS of the legacy UE in the related art. The problem of low spectral efficiency of the system caused by collisions has achieved the technical effect of improving the spectral efficiency of the system.

In this embodiment, the foregoing multiple modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing multiple modules are all located in the same processor; Modules are located in different processors in any combination.

Example 3

The embodiment further provides a storage medium in which a computer program is stored, wherein the computer program is set to perform a determination method of the reference signal pattern in any of the above embodiments at runtime.

In an embodiment, the storage medium may be configured to store a computer program for performing the following steps.

Determining a demodulation reference signal DMRS offset pattern, wherein the DMRS offset pattern is a pattern of a preset pattern relative to a DMRS offset of a Long Term Evolution, LTE/Enhanced Long Term Evolution (LTE) system.

In an embodiment, the foregoing storage medium may include, but is not limited to, at least one medium that can store a computer program, such as a USB flash drive, a ROM, a RAM, a mobile hard disk, a magnetic disk, or an optical disk.

The embodiment further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, the processor being arranged to execute a computer program to perform the determination method of the reference signal pattern in any of the above embodiments.

In an embodiment, the electronic device may further include a transmission device and an input and output device, wherein the transmission device is connected to the processor, and the input and output device is connected to the processor.

In an embodiment, the above processor may be arranged to perform the following steps by a computer program.

For specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments, and details are not described herein again.

The at least one module or at least one of the steps described above may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices. In an embodiment, the at least one module or at least one step may be implemented by program code executable by the computing device, such that the at least one module or at least one step may be stored in the storage device by the computing device or The at least one module or the at least one step is separately fabricated into at least one integrated circuit module, or the at least one module or the plurality of modules or steps in at least one step are fabricated into a single integrated circuit module. As such, the disclosure is not limited to any specific combination of hardware and software.

Claims

A method for determining a reference signal pattern, comprising:

Determining a demodulation reference signal DMRS offset pattern, wherein the DMRS offset pattern is a pattern of a preset pattern relative to a DMRS offset of a Long Term Evolution (LTE) or Enhanced Long Term Evolution (LTE) system.
The method of claim 1 further comprising:

The use of the DMRS offset pattern is determined according to at least one of the following: a radio resource control RRC signaling configuration, a downlink control information DCI indication, and a preset rule.
The method according to claim 1 or 2, wherein, in a case where the preset pattern is a reference baseline pattern, the frequency domain subcarrier position occupied by the DMRS offset pattern comprises at least one of the following:

The subcarrier positions occupied by at least one of port 7 and port 8 in the two physical resource blocks PRB are respectively k=3 and k=8 in PRB0, and k=3 and k=9 in PRB1;

The subcarrier positions occupied by at least one of the ports 9 and 10 in the two PRBs are respectively k=2 and k=7 in PRB0, and k=2 and k=8 in PRB1;

The subcarrier positions occupied by at least one of port 7 and port 8 in 2 PRBs are k=3 and k=9 in PRB0, respectively, k=3 and k=9 in PRB1;

The subcarrier positions occupied by at least one of port 9 and port 10 in 2 PRBs are k=2 and k=8 in PRB0, respectively, and k=2 and k=8 in PRB1;

The subcarrier positions occupied by at least one of port 7 and port 8 in 2 PRBs are k=2 and k=8 in PRB0, respectively, and k=3 and k=10 in PRB1;

The subcarrier positions occupied by at least one of port 9 and port 10 in 2 PRBs are k=0 and k=7 in PRB0, respectively, and k=2 and k=9 in PRB1;

The k is a subcarrier number index in a PRB, and the value is 0-11.
The method according to claim 1 or 2, wherein, in a case where the preset pattern is a micro-slot offset sub-slot shift DMRS pattern, a frequency domain subcarrier position occupied by the DMRS offset pattern includes At least one of the following:

When the offset value vshift=0, the subcarrier positions occupied by at least one of port 7 and port 8 in 2 PRBs are k=4 and k=8 in PRB0, and k=4 in PRB1, respectively. k=8; at least one of port 9 and port 10 occupying subcarrier positions in 2 PRBs are k=2 and k=7 in PRB0, and k=2 and k=7 in PRB1;

When the offset value vshift=1, the subcarrier positions occupied by at least one of port 7 and port 8 in the two PRBs are k=3 and k=9 in PRB0, and k=3 in PRB1, respectively. k=9; at least one of port 9 and port 10 occupying subcarrier positions in 2 PRBs are k=2 and k=8 in PRB0, and k=2 and k=8 in PRB1;

When the offset value vshift=2, the subcarrier positions occupied by at least one of port 7 and port 8 in 2 PRBs are k=4 and k=9 in PRB0, and k=4 in PRB1, respectively. k=9; at least one of port 9 and port 10 occupying subcarrier positions in 2 PRBs are k=3 and k=7 in PRB0, and k=3 and k=7 in PRB1;

The k is a subcarrier number index in a PRB, and the value is 0-11.
The method according to claim 1 or 2, wherein, in a case where the preset pattern is a micro-slot offset sub-slot shift DMRS pattern, a frequency domain subcarrier position occupied by the DMRS offset pattern includes At least one of the following:

When the offset value vshift=0, the subcarrier positions occupied by at least one of port 7 and port 8 in 2 PRBs are k=4 and k=8 in PRB0, and k=4 in PRB1, respectively. k=10; at least one of port 9 and port 10 occupying subcarrier positions in 2 PRBs are k=2 and k=7 in PRB0, and k=2 and k=8 in PRB1;

When the offset value vshift=1, the subcarrier positions occupied by at least one of port 7 and port 8 in the two PRBs are k=2 and k=8 in PRB0, and k=3 in PRB1, respectively. k=9; at least one of port 9 and port 10 occupying subcarrier positions in 2 PRBs, respectively, k=0 and k=5 in PRB0, and k=2 and k=8 in PRB1;

When the offset value vshift=2, the subcarrier positions occupied by at least one of port 7 and port 8 in 2 PRBs are k=3 and k=9 in PRB0, and k=3 in PRB1, respectively. k=10; at least one of port 9 and port 10 occupying subcarrier positions in 2 PRBs, respectively, k=0 and k=7 in PRB0, and k=0 and k=9 in PRB1;

The k is a subcarrier number index in a PRB, and the value is 0-11.
The method of claim 2, wherein determining the use of the DMRS offset pattern based on at least one of the RRC signaling configuration and the DCI indication comprises one of the following:

Using 1 bit in the RRC signaling configuration to indicate that a pattern after offset with respect to the LTE DMRS is used or a pattern that is not offset with respect to the LTE DMRS is used;

A bit in the DCI indication is used to indicate that a pattern after offset with respect to the LTE DMRS is used or a pattern that is not offset with respect to the LTE DMRS is used.
The method of claim 2, wherein determining the use of the DMRS offset pattern according to the preset rule comprises at least one of the following:

Only the short transmission time interval sTTI#2 uses the DMRS offset pattern; sTTI#2 and sTTI#4 use the DMRS offset pattern; all sTTIs use the DMRS offset pattern; the configured or indicated sTTI uses the DMRS offset pattern; sTTI without cell-specific pilot CRS or collision with configured channel state information measurement pilot CSI-RS uses the DMRS offset pattern; only sTTI#5 uses the DMRS offset pattern; sTTI #1 and sTTI#5 use the DMRS offset pattern; the DMRS offset pattern cannot be used using the sTTI of the baseline pattern.
A determining device for a reference signal pattern, comprising:

The first determining module is configured to determine a demodulation reference signal DMRS offset pattern, where the DMRS offset pattern is a pattern of the preset pattern relative to the DMRS offset of the Long Term Evolution (LTE) or Enhanced Long Term Evolution (LTE) system.
The apparatus of claim 8 further comprising:

The second determining module is configured to determine, according to at least one of the following manners, the use of the DMRS offset pattern: a radio resource control RRC signaling configuration, a downlink control information DCI indication, and a preset rule.
A storage medium storing a computer program, the computer program being arranged to perform the method of any one of claims 1 to 7 at runtime.
An electronic device comprising a memory and a processor, the memory storing a computer program, the processor being arranged to execute the computer program to perform the method of any one of claims 1 to 7.