CN113497695B

CN113497695B - DMRS transmission method and terminal

Info

Publication number: CN113497695B
Application number: CN202010266898.2A
Authority: CN
Inventors: 彭淑燕; 纪子超
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2023-10-27
Anticipated expiration: 2040-04-07
Also published as: WO2021204049A1; CN113497695A

Abstract

The invention provides a transmission method and a terminal of a DMRS, wherein the method comprises the following steps: transmitting a DMRS in a first symbol in a target slot if the maximum number of the DMRS symbol is greater than the maximum number of the first symbol in the target slot; wherein the first symbol is a symbol available for PSSCH. The embodiment of the invention can keep the understanding of the sending terminal and the receiving terminal on the DMRS transmission consistent under the condition that the DMRS transmission and other transmissions possibly have conflict.

Description

DMRS transmission method and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a DMRS transmission method and a terminal.

Background

In a conventional V2X Sidelink (SL), a terminal-indicated demodulation reference signal (Demodulation Reference Signal, DMRS) pattern (pattern) may be indicated or transmitted by a network device, and DMRS transmission may be performed based on the indicated DMRS pattern. In practical applications of a New Radio, NR, the indicated DMRS pattern may not match with resources available for DMRS transmission, for example, DMRS transmission may collide with other transmissions, so that the understanding of the DMRS transmission by the transmitting terminal and the receiving terminal is inconsistent.

Disclosure of Invention

The embodiment of the invention provides a transmission method and a terminal of a DMRS (digital mobile radio reference signal), which are used for solving the problem that when the DMRS transmission collides with other transmissions, the understanding of a sending terminal and a receiving terminal on the DMRS transmission is inconsistent.

In a first aspect, an embodiment of the present invention provides a DMRS transmission method, applied to a terminal, including:

transmitting a DMRS in a first symbol in a target slot if the maximum number of the DMRS symbol is greater than the maximum number of the first symbol in the target slot;

wherein the first symbol is a symbol that can be used for a physical side link shared channel, PSSCH.

In a second aspect, an embodiment of the present invention provides a terminal, including:

a transmission module for transmitting the first symbol in the target slot when the maximum number of the DMRS symbol is greater than the maximum number of the first symbol in the target slot

The embodiment of the invention defines that the DMRS is transmitted in the first symbol in the target time slot under the condition that the maximum number of the DMRS symbol is larger than the maximum number of the first symbol in the target time slot. Accordingly, in the case where there may be a collision between the DMRS transmission and other transmissions, the understanding of the DMRS transmission by the transmitting terminal and the receiving terminal can be kept consistent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a block diagram of a network system to which embodiments of the present application are applicable;

fig. 2 is a flowchart of a DMRS transmission method provided in an embodiment of the present application;

fig. 3A to 13 are diagrams illustrating DMRS transmission examples according to an embodiment of the present application;

fig. 14 is a block diagram of a terminal according to an embodiment of the present application;

fig. 15 is a block diagram of another terminal according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means at least one of the connected objects, e.g., a and/or B, meaning that it includes a single a, a single B, and that there are three cases of a and B.

In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

Embodiments of the present invention are described below with reference to the accompanying drawings. The transmission method and the terminal of the DMRS provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may be a 5G system, or an evolved long term evolution (Evolved Long Term Evolution, elet) system, or a subsequent evolved communication system.

Referring to fig. 1, fig. 1 is a block diagram of a network system to which the embodiment of the present invention is applicable, and as shown in fig. 1, the network system includes a first terminal 11, a second terminal 12, and a network device 13, where the first terminal 11 and the second terminal 12 may be user terminals or other terminal side devices, for example: terminal-side devices such as a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer), a personal digital assistant (personal digital assistant, PDA for short), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (Wearable Device), a vehicle or a Road Side Unit (RSU), etc., it should be noted that the specific types of the first terminal 11 and the second terminal 12 are not limited in the embodiment of the present invention. The network device may be a 5G base station, or a later version of a base station, or a base station in other communication systems, or referred to as a node B, an evolved node B, or a transmitting/receiving Point (Transmission Reception Point, TRP), or an Access Point (AP), or other words in the field, and the network device is not limited to a specific technical word as long as the same technical effect is achieved. In addition, the network device may be a Master Node (MN) or a Secondary Node (SN). It should be noted that, in the embodiment of the present invention, only a 5G base station is taken as an example, but the specific type of the network device is not limited.

Alternatively, in fig. 1, for the sidelink transmission from the first terminal 12 to the second terminal 13, the first terminal 11 is a transmitting end or a transmitting terminal of the sidelink transmission, and the second terminal 12 is a receiving end or a receiving terminal of the sidelink transmission. Of course, in other sidelink transmissions, the first terminal 12 may also act as a receiving end or receiving terminal for other sidelink transmissions.

For ease of understanding, some of the following descriptions are directed to embodiments of the present invention:

1. SL profile.

The long term evolution (Long Term Evolution, LTE) system supports a sidelink, which may also be referred to as a sidelink, a side link, or a side link, for direct data transmission between terminal devices (UEs) without through a network device.

The design of LTE sidelink is applicable to specific public safety transactions, or internet of vehicles (vehicle to everything, V2X) communications, etc. The internet of vehicles communication includes various services such as basic security class communication, automatic driving, formation, sensor expansion, and the like. Since LTE sidelink only supports broadcast communications, it is mainly used for basic security class communications, and other advanced V2X services with strict QoS requirements in terms of latency, reliability, etc. will be supported through New Radio (NR) sidelink.

The UE transmits sidelink control information (Sidelink Control Information, SCI) over a physical sidelink control channel (Physical Sidelink Control Channel, PSCCH), scheduling transmission of a physical sidelink shared channel (Physical Sidelink Shared Channel, PSCCH) to transmit data. The transmission is in broadcast form, and the receiving end does not answer to the transmitting end whether the reception is successful.

NR sidelink includes the following channels:

PSCCH；

PSSCH；

PSBCH (Physical Sidelink Broadcast Channel )

PSFCH (Physical Sidelink Discovery Feedback Channel, physical sidelink feedback channel).

2. With respect to PSFCH.

In order to carry Acknowledgement (ACK) or negative Acknowledgement (Negative Acknowledgement, NACK) feedback information at the SL, NR V2X supports a new SL channel, i.e. PSFCH. The PSFCH channel has a Period of N in the time domain, where N may be 1, 2 or 4, where N may be understood as including PSFCH every N logical slots (slots), and the last 4 symbols (symbols) in the slot are used for PSFCH, and the last 4 symbols are Guard Period (GP), automatic gain control (Automatic gain control, AGC), PSFCH, GP in order. The slot calculated here is the slot already allocated for the use of the sidelink, that is to say here N is considered to be the logical slot of SL.

3. DMRS pattern on SL (pattern).

At SL, the time domain pattern and the frequency domain pattern of the DMRS are shown in table one below, respectively.

List one

Wherein the symbols in the slot are numbered from 0.

Referring to fig. 2, fig. 2 is a flowchart of a DMRS transmission method according to an embodiment of the present invention, where the method is applied to a terminal, as shown in fig. 2, and includes the following steps:

step 201, transmitting DMRS in a first symbol in a target slot if the maximum number of the DMRS symbol is greater than the maximum number of the first symbol in the target slot;

wherein the first symbol is a symbol available for PSSCH.

In the embodiment of the present invention, in the case that there is other transmission except PSSCH transmission in the target slot, the maximum number of the DMRS symbol may be greater than the maximum number of the first symbol. The other transmissions may include PSFCH transmissions, etc., and in the following embodiments, PSFCH transmissions are taken as an example. The DMRS symbol may be indicated by a network device or a transmitting terminal. Further, the DMRS symbol may be understood as a DMRS symbol of the PSSCH.

It should be understood that the DMRS transmission method provided in the embodiment of the present invention may be applied to a transmitting terminal or a receiving terminal, that is, the terminal may be a transmitting terminal or a receiving terminal. The above transmission may be understood as either transmission or reception. A DMRS may be transmitted in a first symbol for a transmitting terminal; the DMRS may be received in a first symbol for a receiving terminal.

Optionally, in the SL resource pools, the optional one or more DMRS patterns in each resource pool are radio resource control (Radio Resource Control, RRC) configuration parameters, and the transmitting end may further indicate one DMRS pattern through the SCI for transmission of SL data. However, when the PSFCH is configured in the resource pool, the symbol of the DMRS transmitted by the terminal may collide with the PSFCH in the target slot including the PSFCH. Resulting in the maximum number of DMRS symbols in the target slot being greater than the maximum number of the first symbol in the target slot.

For example, the DMRS symbols include symbol 1, symbol 4, symbol 7, and symbol 10. There is a PSFCH transmission in the target slot, which occupies the last 4 symbols of the target slot, and the GP occupies symbols 8, 9, 10 and 11 under the extended cyclic prefix ECP. The maximum number of the DMRS symbol is 10, i.e. the number corresponding to symbol 10; the first symbol in the target slot includes symbols 0 through 7, i.e., the maximum number of the first symbol is 7. At this time, the maximum number 10 of DMRS symbols in the target slot is greater than the maximum number 7 of the first symbol, and thus, DMRS is transmitted only in the first symbol for the target slot. Optionally, in this embodiment, the overhead occupied by the PSFCH transmission is from the 4 th symbol to the 2 nd symbol of the last of the target slot. Namely symbol 8, symbol 9 and symbol 10, wherein symbol 8 corresponds to GP, symbol 9 corresponds to ACG, and symbol 10 corresponds to PSFCH.

There is a PSFCH transmission in the target slot, which occupies the last 4 symbols of the target slot, and the GP occupies symbols 10, 11, 12 and 13 under the normal cyclic prefix (Normal Cyclic Prefix, NCP). The maximum number of the DMRS symbol is 10, i.e. the number corresponding to symbol 10; the first symbol in the target slot includes symbols 0 to 9, i.e., the maximum number of the first symbol is 9. At this time, the maximum number 10 of DMRS symbols in the target slot is greater than the maximum number 9 of the first symbol, and thus, DMRS is transmitted only in the first symbol for the target slot. Optionally, in this embodiment, the overhead occupied by the PSFCH transmission is from the 4 th symbol to the 2 nd symbol of the last of the target slot. Namely, symbol 10, symbol 11 and symbol 12, wherein symbol 10 corresponds to GP, symbol 11 corresponds to ACG, and symbol 12 corresponds to PSFCH.

It should be understood that the above-mentioned symbols available for PSSCH may be understood as symbols available for PSSCH transmission in a certain slot, for example, in the case where no other transmission exists in a certain slot, all symbols of the slot are symbols available for PSSCH. In the case where there are other transmissions in a certain slot, part of the symbols of that slot are available for the PSSCH.

Optionally, a second symbol is further included in the target slot.

In this embodiment, the second symbol may be understood as a symbol not used for the PSSCH. For example, in an embodiment, for a case where there is a PSFCH transmission, the second symbol may include at least one of:

PSFCH symbols;

AGC symbols;

GP symbol.

It should be noted that, the implementation manner for transmitting the DMRS in the first symbol may be set according to actual needs, and the detailed description is described in different embodiments below.

In an embodiment, the pattern of the DMRS may be kept unchanged, and the information on the second symbol performs puncturing processing on the DMRS having a collision. For example, in the first symbol, the DMRS transmitted satisfies, or the mapping rule of the DMRS satisfies:

DMRS mapped on the DMRS symbol of the first symbol;

The DMRS is not mapped on the DMRS symbol of the second symbol.

In this embodiment, the DMRS mapped to the DMRS symbol located on the first symbol and not mapped to the DMRS symbol located on the second symbol may be understood as: DMRS is mapped only on the first symbol. Alternatively, the DMRS is not mapped on the PSFCH symbol, the AGC symbol, and the GP symbol. AGC on the second symbol, or PSFCH, or GP punctures, i.e., maps, the corresponding DMRS symbol. For example, if the indicated DMRS symbol collides with the AGC symbol, the DMRS symbol is not mapped on the AGC symbol. I.e., the corresponding DMRS symbol maps the AGC information of the PSFCH.

It should be noted that, the transmitting terminal may map the DMRS at the corresponding position on the first symbol according to the mapping rule, and the receiving terminal may receive the DMRS at the corresponding position on the first symbol according to the mapping rule, where the actions of the receiving terminal include:

receiving a DMRS on the DMRS symbol of the first symbol;

DMRS is not received on the DMRS symbol of the second symbol.

In another embodiment, the DMRS pattern may also be modified, e.g., in the first symbol, the DMRS pattern of the DMRS includes any one of:

Protocol default DMRS pattern;

DMRS patterns associated with preset parameters;

default DMRS patterns preconfigured by the network device.

In this embodiment, the default DMRS pattern includes pattern 1 and/or pattern 2, where pattern 1 is symbol 1 and symbol 5, and pattern 2 is symbol 1, symbol 4, and symbol 7.

The DMRS may be understood as being transmitted on symbol 1 and symbol 5 for pattern 1 above. For example, when there is a DMRS symbol that is not within the available PSSCH symbols in the pattern of DMRS indicated by SCI, the pattern of DMRS transmitted is considered to be pattern 1. The transmitting terminal/receiving terminal transmits/receives DMRS in pattern 1.

The DMRS may be understood as being transmitted on symbol 1, symbol 4, and symbol 7 for pattern 2 above. For example, when there is a DMRS symbol that is not within the available PSSCH symbol in the pattern of DMRS indicated by SCI, the pattern of DMRS transmitted is considered to be pattern 2. The transmitting terminal/receiving terminal transmits/receives DMRS in pattern 2. It will be appreciated that this pattern 2 configuration is primarily directed to the effect of the introduction of PSFCH, and does not take into account the fact that the number of symbols for SL on the licensed band may be less than 12 or 14 symbols.

When the default patterns include pattern 1 and pattern 2, it is also possible to determine which default pattern is actually adopted by other parameters. For example, negotiations may be performed by the transmitting terminal and the receiving terminal, or determined according to conflicting transmission types, or determined according to the number of symbols of the indicated DMRS pattern, as a default configuration of the number of DMRS symbols closest to the indication. For example, pattern 2 is used when the number of symbols of the most recently indicated DMRS symbol is 4, and pattern 1 is used when the number of symbols of the most recently indicated DMRS symbol is 2.

The default DMRS pattern may be understood as a protocol default DMRS pattern, or may be understood as a network device preconfigured with a default DMRS pattern. The default DMRS pattern is preconfigured by the network device, and the network can be understood to ensure that the configured default DMRS pattern is available in any situation. In the case where the network device does not configure the default DMRS pattern in advance, the terminal considers the case of an error.

For a DMRS pattern associated with a preset parameter, it may be understood that a default DMRS pattern is associated with the preset parameter, which may include at least one of:

the number of DMRS symbols;

configuration of Cyclic Prefix (CP);

subcarrier spacing (Subcarrier Spacing, SCS).

In this embodiment, for the number of DMRS symbols, different number intervals of DMRS symbols may be set to associate different DMRS patterns, for example, less than or equal to 4 DMRS symbols corresponding to DMRS pattern a, more than 4 DMRS symbols and less than 7 DMRS symbols corresponding to DMRS pattern B, and more than or equal to 7 DMRS symbols corresponding to DMRS pattern C.

For configuration of CP, an extended cyclic prefix (Extended Cyclic Prefix, ECP) and NCP may be set to correspond to different DMRS patterns.

For subcarrier spacing, different DMRS patterns corresponding to different subcarrier spacing may be set.

When the preset parameters include at least two items, a unique DMRS pattern may be determined by at least two parameters, for example, one parameter is used to determine one DMRS pattern set, and another parameter determines a DMRS pattern selected according to a preset rule in the DMRS pattern set. It may also be provided that a combination of at least two parameters is associated with the same DMRS pattern, for example, when the configuration of the CP is ECP and the number of DMRS symbols is 2, the DMRS pattern a is associated; when the configuration of the CP is ECP and the number of DMRS symbols is 3, associating DMRS pattern B; when the configuration of the CP is NCP and the number of DMRS symbols is 2, associating DMRS pattern C; when the configuration of the CP is NCP and the number of DMRS symbols is 3, the DMRS pattern D is associated.

Further, in an embodiment, the pattern of the DMRS is determined according to the number of symbols of the first symbol.

In case 1, the higher layer signaling may be RRC signaling regardless of the style set of the higher layer signaling configuration. For example, the DMRS pattern may be a first DMRS pattern selected from a set of DMRS patterns defined by a protocol.

In this embodiment, the first DMRS pattern may be a DMRS pattern corresponding to the first number of DMRS symbols,

the first DMRS symbol number is a maximum DMRS symbol number or a minimum DMRS symbol number corresponding to the symbol number of the first symbol.

For example, as shown in the above table one, when the number of symbols of the first symbol is 10 and the number of symbols of the first symbol is the maximum number of symbols of the first symbol, the first DMRS pattern is symbol 1, symbol 4, and symbol 7. When the number of symbols of the first symbol is 10 and the number of symbols of the first DMRS is the minimum number of symbols of the DMRS corresponding to the number of symbols of the first symbol, the first DMRS pattern is symbol 3 and symbol 8.

In case 2, the DMRS pattern is a second DMRS pattern selected from the DMRS pattern set configured by the higher layer signaling.

Optionally, the second DMRS pattern satisfies:

when at least one DMRS pattern is included in the DMRS pattern set configured by the higher layer signaling and a preset condition is met, the second DMRS pattern is the DMRS pattern with the largest or smallest DMRS symbol number in the at least one DMRS pattern, L is a positive integer smaller than or equal to N, and N is the symbol number of the first symbol;

the preset conditions include any one of the following:

l is equal to N;

and when L is smaller than N, the DMRS patterns corresponding to the symbol number Q do not exist in the DMRS pattern set which is contained in the high-layer signaling configuration, and Q is an integer which is larger than L and smaller than or equal to N.

In this embodiment, the second DMRS pattern may be obtained by traversing in a certain manner. For example, the traversal method includes the following steps:

firstly, traversing the DMRS pattern corresponding to the number N of the first symbol, wherein the configurable maximum number of DMRS symbols corresponding to the number N of the first symbol is M. When M is more than or equal to 2, configuring the corresponding maximum DMRS symbol M as pattern #1, and if pattern #1 is in the DMRS pattern set configured by RRC, selecting pattern #1 as a second DMRS pattern;

if pattern#1 is not in the RRC configured DMRS pattern set, when M is more than or equal to 3, if pattern#2 configured by the DMRS symbol number M-1 is in the RRC configured DMRS pattern set, selecting pattern#2 as a second DMRS pattern;

if pattern#2 is not in the DMRS pattern set configured by RRC, when m=4, if configured pattern#3 of DMRS symbol number M-2 is in the DMRS pattern set configured by RRC, selecting pattern#3 as the second DMRS pattern;

if pattern #3 is not in the set of DMRS patterns configured by RRC, continuing to traverse the DMRS patterns corresponding to symbol number N-1 in the above manner until a second DMRS pattern is determined.

For a better understanding of the present invention, specific implementations of the present invention are described in detail below.

In embodiment 1, the protocol predefines that DMRS symbols are punctured when the indicated symbol number of the DMRS is greater than the available symbols of the PSSCH.

When SCI indicates DMRS configuration <1,4,7, 10>; in this slot, PSFCH is configured, DMRS transmission includes case 1 and case 2, where case 1 is the case in the normal cyclic prefix NCP configuration and case 2 is the case in the extended cyclic prefix ECP configuration. For case 1, as shown in fig. 3A, symbol 10 is used for protecting a symbol, and if the symbol 10 collides with the configuration of the DMRS indicated by the SCI, the transmitting end and the receiving end consider that the DMRS of the symbol 10 is knocked out, and at this time, the DMRS is actually transmitted as shown in fig. 3B. For case 2, as shown in fig. 4A, a symbol 10 is used for PSFCH transmission, and if the symbol 10 collides with the configuration of the DMRS indicated by the SCI, the transmitting end and the receiving end consider that the DMRS of the symbol 10 is knocked out, and at this time, the DMRS is actually transmitted as shown in fig. 4B.

When SCI indicates DMRS configuration <1,6, 11>; in this slot, when the PSFCH is configured, the symbol 11 is used for AGC adjustment of the PSFCH, the AGC symbol collides with the configuration of the DMRS indicated by the SCI, and as shown in fig. 5A, the transmitting end and the receiving end consider that the DMRS of the symbol 11 is knocked out. At this time, the DMRS is actually transmitted on the symbol <1,6>, as shown in fig. 5B.

When SCI indicates DMRS is configured to <3, 10>; in this slot, PSFCH is configured, and transmission of DMRS includes case 3 and case 4, where case 3 is the case in the normal cyclic prefix NCP configuration and case 4 is the case in the extended cyclic prefix ECP configuration. For case 3, as shown in fig. 6A, symbol 10 is used as a guard symbol in the configuration of NCP, and the guard symbol collides with the configuration of DMRS indicated by SCI, and the transmitting end and the receiving end consider that the DMRS of symbol 10 is knocked out. At this time, the DMRS is actually transmitted on symbol 3, as shown in fig. 6B. For case 4, as shown in fig. 7A, symbol 10 is used for PSFCH in the configuration of ECP, where the PSFCH symbol collides with the configuration of DMRS indicated by SCI, and the transmitting end and the receiving end consider that the DMRS of symbol 10 is knocked out. At this time, the DMRS is actually transmitted on symbol 3, as shown in fig. 7B.

When SCI indicates DMRS is configured to <4, 10>; in this slot, PSFCH is configured, and transmission of DMRS includes case 5 and case 6, where case 5 is the case in the normal cyclic prefix NCP configuration and case 6 is the case in the extended cyclic prefix ECP configuration. For case 5, as shown in fig. 8A, symbol 10 is used to protect the symbol, and if the symbol 10 collides with the configuration of the DMRS indicated by the SCI, the transmitting end and the receiving end consider that the DMRS of the symbol 10 is knocked out. At this time, the DMRS is actually transmitted on symbol 4, as shown in fig. 8B. For case 6, as shown in fig. 9A, a symbol 10 is used for transmission of the PSFCH, and if the symbol 10 collides with the configuration of the DMRS indicated by the SCI, the transmitting end and the receiving end consider that the DMRS of the symbol 10 is knocked out. At this time, the DMRS is actually transmitted on symbol 4, as shown in fig. 9B.

In embodiment 2, the protocol predefines that DMRS symbols are punctured when the indicated symbol number of the DMRS is greater than the available symbols of the PSSCH. When the configuration of the cyclic prefix CP is ECP, the following cases are included:

when SCI indicates DMRS configuration <1,5,9>; in this slot, when the PSFCH is configured, the symbol 9 is used for AGC adjustment of the PSFCH, the AGC symbol collides with the configuration of the DMRS indicated by the SCI, and as shown in fig. 10A, the transmitting end and the receiving end consider that the DMRS of the symbol 9 is knocked out. That is, the DMRS is actually transmitted on symbol 1 and symbol 5, as shown in fig. 10B.

When SCI indicates DMRS configuration <3,8>; in this slot, when the PSFCH is configured, the symbol 8 is used for a guard symbol, and the guard symbol collides with the configuration of the DMRS indicated by the SCI, as shown in fig. 11A, and the transmitting end and the receiving end consider that the DMRS of the symbol 8 is knocked out. At this time, the DMRS is actually transmitted on symbol 3, as shown in fig. 11B.

When SCI indicates DMRS configuration <4,8>; in this slot, when the PSFCH is configured, the symbol 8 is used for a guard symbol, and the guard symbol collides with the configuration of the DMRS indicated by the SCI, as shown in fig. 12A, and the transmitting end and the receiving end consider that the DMRS of the symbol 8 is knocked out. At this time, the DMRS is actually transmitted on symbol 4, as shown in fig. 12B.

In embodiment 3, the protocol predefines the DMRS pattern of the terminal when the DMRS symbol number indicated by the SCI is greater than the symbol number actually available for the PSSCH, according to the configuration of the maximum number of DMRS symbols corresponding to the actually available symbols of the PSSCH.

Under the NCP configuration, when the SCI indicates that the DMRS configuration is <1,4,7, 10> or <1,6, 11> or <3, 10> or <4, 10>; in this slot, PSFCH is configured, symbol 10 would collide with the guard symbol or symbol 11 would collide with the AGC symbol, as illustrated in fig. 3A by <1,4,7, 10> for example.

If the number of actually available symbols of the PSSCH is 10 symbols, the corresponding maximum DMRS pattern is <1,4,7> according to the protocol, and the DMRS is actually transmitted on symbol 1, symbol 4, and symbol 7, as shown in fig. 3B.

Under ECP, when SCI indicates DMRS is configured as <1,4,7, 10>, or <1,5,9> or <3, 10> or <4, 10> or <3,8> or <4,8>; in this slot, PSFCH is configured, symbol 10 would collide with PSFCH, or symbol 9 would collide with AGC symbol, or symbol 8 would collide with guard symbol, as illustrated in fig. 4A by <1,4,7, 10> for example.

If the number of actually available symbols of the PSSCH is 8 symbols, the DMRS pattern of the corresponding maximum number of DMRS symbols is <1,5> according to the protocol, and the DMRS is actually transmitted on symbol 1 and symbol 5, as shown in fig. 13.

In embodiment 4, the protocol predefines that when the DMRS symbol number indicated by the SCI is greater than the symbol number actually available for the PSSCH, the DMRS pattern is obtained from the RRC configured DMRS pattern set according to the symbol of the actually available PSSCH. The patterns of DMRS available in the resource pool are configured by RRC to include <1,4,7, 10>, <1,4,7> and <3,8>.

1. Under the NCP configuration, when the SCI indicates that the DMRS configuration is <1,4,7, 10> or <3,8>; in this slot, the PSFCH is configured, symbol 10 would collide with the guard symbol.

If the number of actually available symbols of the PSSCH is 10 symbols, the corresponding DMRS number is at most 3, and the corresponding DMRS pattern is <1,4,7>.

2. Under ECP configuration, when SCI indicates DMRS configuration <1,4,7, 10> or <3,8>; in this slot, the PSFCH is configured, symbol 8 may collide with the guard symbol or symbol 10 may collide with the PSFCH.

If the number of actually available symbols of the PSSCH is 8 symbols, the corresponding DMRS number is 2, and the corresponding DMRS pattern is <1,5>.

It should be noted that, when the PSFCH is configured in the resource pool, the primary transmission and the retransmission may be respectively located in the time slots carrying the PSFCH and the time slots not carrying the PSFCH, and in the case that the PSFCH may cause inconsistent costs of the actual DMRS in the primary transmission and the retransmission, in the embodiment of the present invention, it may be ensured that the DMRS costs of the primary transmission and the retransmission are the same when the terminal calculates the time-based service (Time Based Service, TBS), so that the combination of the primary transmission and the retransmission may be realized, and the combination gain may be obtained.

Referring to fig. 14, fig. 14 is a block diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 14, a terminal 1400 includes:

a transmission module 1401, configured to transmit a DMRS in a first symbol in a target slot if a maximum number of the DMRS symbol is greater than a maximum number of the first symbol in the first symbol;

wherein the first symbol is a symbol available for PSSCH.

Optionally, a second symbol is further included in the target slot.

Optionally, the second symbol includes at least one of:

physical sidelink feedback channel, PSFCH, symbols;

automatic gain control symbols;

guard interval symbols.

Optionally, in the first symbol, the DMRS transmitted satisfies:

DMRS mapped on the DMRS symbol of the first symbol;

the DMRS is not mapped on the DMRS symbol of the second symbol.

Optionally, in the first symbol, the DMRS pattern of the DMRS includes any one of the following:

protocol default DMRS pattern;

DMRS patterns associated with preset parameters;

default DMRS patterns preconfigured by the network device.

Optionally, the default DMRS pattern includes pattern 1 and/or pattern 2, where pattern 1 is symbol 1 and symbol 5, and pattern 2 is symbol 1, symbol 4, and symbol 7.

Optionally, the preset parameters include at least one of the following:

the number of DMRS symbols;

configuration of cyclic prefix;

subcarrier spacing.

Optionally, the pattern of the DMRS is determined according to the number of symbols of the first symbol.

Optionally, the pattern of the DMRS is a first DMRS pattern selected from a set of DMRS patterns defined by a protocol.

Optionally, the first DMRS pattern is a DMRS pattern corresponding to the first number of DMRS symbols,

Optionally, the pattern of the DMRS is a second DMRS pattern selected from a DMRS pattern set configured by higher layer signaling.

Optionally, the second DMRS pattern satisfies:

the preset conditions include any one of the following:

l is equal to N;

The terminal provided by the embodiment of the present invention can implement each process implemented by the terminal in the method embodiment of fig. 2, and in order to avoid repetition, a description is omitted here.

Fig. 15 is a schematic diagram of a hardware structure of a terminal for implementing various embodiments of the present invention.

The terminal 1500 includes, but is not limited to: a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, a processor 1510, and a power supply 1511. It will be appreciated by those skilled in the art that the terminal structure shown in fig. 15 is not limiting of the terminal and that the terminal may include more or fewer components than shown, or may combine certain components, or a different arrangement of components. In the embodiment of the invention, the terminal comprises, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer and the like.

A radio frequency unit 1501, configured to transmit a DMRS in a first symbol in a target slot if a maximum number of the DMRS symbol is greater than a maximum number of the first symbol in the first symbol;

Wherein the first symbol is a symbol available for PSSCH.

It should be understood that, in this embodiment, the processor 1510 and the radio frequency unit 1501 can implement the respective processes implemented by the terminal in the method embodiment of fig. 2, and in order to avoid repetition, a detailed description is omitted here.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 1501 may be configured to receive and send information or signals during a call, specifically, receive downlink data from a base station, and then process the received downlink data with the processor 1510; and, the uplink data is transmitted to the base station. Typically, the radio frequency unit 1501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 1501 may also communicate with networks and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user through the network module 1502, such as helping the user send and receive e-mail, browse web pages, and access streaming media.

The audio output unit 1503 may convert audio data received by the radio frequency unit 1501 or the network module 1502 or stored in the memory 1509 into an audio signal and output as sound. Also, the audio output unit 1503 may also provide audio outputs related to a specific function performed by the terminal 1500 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 1503 includes a speaker, a buzzer, a receiver, and the like.

The input unit 1504 is used to receive an audio or video signal. The input unit 1504 may include a graphics processor (Graphics Processing Unit, GPU) 15041 and a microphone 15042, the graphics processor 15041 processing image data of still pictures or video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The processed image frame may be displayed on the display unit 1506. The image frames processed by the graphics processor 15041 may be stored in memory 1509 (or other storage medium) or transmitted via the radio frequency unit 1501 or the network module 1502. The microphone 15042 may receive sound and may be capable of processing such sound into audio data. The processed audio data can be converted into a format output that can be transmitted to the mobile communication base station via the radio frequency unit 1501 in the case of the telephone call mode.

Terminal 1500 also includes at least one sensor 1505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 15061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 15061 and/or the backlight when the terminal 1500 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and direction when the accelerometer sensor is stationary, and can be used for recognizing the terminal gesture (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking), and the like; sensor 1505 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 1506 is used to display information input by a user or information provided to the user. The display unit 1506 may include a display panel 15061, and the display panel 15061 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 1507 may be used to receive input numeric or character information and to generate key signal inputs related to user settings and function controls of the terminal. Specifically, the user input unit 1507 includes a touch panel 15071 and other input devices 15072. The touch panel 15071, also referred to as a touch screen, may collect touch operations thereon or thereabout by a user (e.g., operations of the user on the touch panel 15071 or thereabout by using any suitable object or accessory such as a finger, stylus, etc.). The touch panel 15071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch azimuth of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device and converts it into touch point coordinates, which are then sent to the processor 1510, and receives commands from the processor 1510 for execution. Further, the touch panel 15071 may be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. The user input unit 1507 may further include other input devices 15072 in addition to the touch panel 15071. In particular, other input devices 15072 may include, but are not limited to, physical keyboards, function keys (e.g., volume control keys, switch keys, etc.), trackballs, mice, joysticks, and so forth, which are not described in detail herein.

Further, the touch panel 15071 may be overlaid on the display panel 15061, and when the touch panel 15071 detects a touch operation thereon or thereabout, the touch operation is transferred to the processor 1510 to determine the type of touch event, and then the processor 1510 provides a corresponding visual output on the display panel 15061 according to the type of touch event. Although in fig. 15, the touch panel 15071 and the display panel 15061 are provided as two separate components to implement the input and output functions of the terminal, in some embodiments, the touch panel 15071 may be integrated with the display panel 15061 to implement the input and output functions of the terminal, which is not limited herein.

The interface unit 1508 is an interface to which an external device is connected to the terminal 1500. For example, the external devices may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 1508 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 1500 or may be used to transmit data between the terminal 1500 and the external device.

The memory 1509 may be used to store software programs as well as various data. The memory 1509 may mainly include a storage program area which may store an operating system, application programs required for at least one function (such as a sound playing function, an image playing function, etc.), and a storage data area; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, memory 1509 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.

The processor 1510 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by running or executing software programs and/or modules stored in the memory 1509 and calling data stored in the memory 1509, thereby performing overall monitoring of the terminal. The processor 1510 may include one or more processing units; preferably, the processor 1510 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1510.

The terminal 1500 may also include a power supply 1511 (e.g., a battery) for powering the various components, and the power supply 1511 may be logically coupled to the processor 1510 via a power management system so as to perform functions such as managing charging, discharging, and power consumption via the power management system.

In addition, the terminal 1500 includes some functional modules, which are not shown, and will not be described herein.

Preferably, the embodiment of the present invention further provides a terminal, which includes a processor 1510, a memory 1509, and a computer program stored in the memory 1509 and capable of running on the processor 1510, where the computer program when executed by the processor 1510 implements each process of the above embodiment of the transmission method of the DMRS, and can achieve the same technical effects, and for avoiding repetition, a detailed description is omitted herein.

The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements each process of the DMRS transmission method embodiment on the terminal side provided by the embodiment of the invention, and can achieve the same technical effect, so that repetition is avoided, and no further description is given here. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a base station, etc.) to perform the method according to the embodiments of the present invention.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims

1. A transmission method of a demodulation reference signal DMRS, applied to a terminal, comprising:

transmitting a second DMRS in a first DMRS symbol if the maximum number of the first DMRS symbol is greater than the maximum number of the first symbol in a target slot;

wherein, the first symbol is a symbol which can be used for a physical side link shared channel PSSCH;

the pattern of the second DMRS is determined according to the number of symbols of the first symbol;

and the pattern of the DMRS determined according to the number of the symbols of the first symbol is a fourth DMRS pattern selected from a DMRS pattern set configured by high-layer signaling.

2. The method of claim 1, further comprising a second symbol in the target time slot.

3. The method of claim 2, wherein the second symbol comprises at least one of:

Physical sidelink feedback channel, PSFCH, symbols;

automatic gain control symbols;

guard interval symbols.

4. The method of claim 2, wherein the second DMRS transmitted at the first symbol satisfies:

DMRS mapped on the DMRS symbol of the first symbol;

the DMRS is not mapped on the DMRS symbol of the second symbol.

5. The method of claim 1, wherein in the first symbol, the DMRS pattern of the second DMRS comprises any one of:

protocol default DMRS pattern;

DMRS patterns associated with preset parameters;

default DMRS patterns preconfigured by the network device.

6. The method of claim 5, wherein the default DMRS pattern comprises pattern 1 and/or pattern 2, the pattern 1 being symbol 1 and symbol 5, the pattern 2 being symbol 1, symbol 4, and symbol 7.

7. The method of claim 5, wherein the predetermined parameters include at least one of:

the number of DMRS symbols;

configuration of cyclic prefix;

subcarrier spacing.

8. The method of claim 1, wherein the pattern of DMRS determined based on the number of symbols of the first symbol is a third DMRS pattern selected from a set of protocol-defined DMRS patterns.

9. The method of claim 8, wherein the third DMRS pattern is a DMRS pattern corresponding to a third number of DMRS symbols,

and the third DMRS symbol number is the maximum DMRS symbol number or the minimum DMRS symbol number corresponding to the symbol number of the first symbol.

10. The method of claim 1, wherein the fourth DMRS pattern satisfies:

at least one DMRS pattern is included in the DMRS pattern set configured by the higher layer signaling, and the fourth DMRS pattern is the DMRS pattern with the largest or smallest DMRS symbol number in the at least one DMRS pattern when a preset condition is satisfied, wherein L is a positive integer smaller than or equal to N, and N is the symbol number of the first symbol;

the preset conditions include any one of the following:

l is equal to N;

11. The method of claim 1, wherein the first DMRS symbol is indicated by a network device or a transmitting terminal indication.

12. A terminal, comprising:

A transmission module, configured to transmit a second DMRS in a first DMRS symbol if a maximum number of the first DMRS symbol is greater than a maximum number of the first symbol in a target slot;

13. A terminal, comprising: a memory, a processor, and a program stored on the memory and executable on the processor, which when executed by the processor, performs the steps in the DMRS transmission method of any one of claims 1 to 11.

14. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, which when executed by a processor, implements the steps of the transmission method of the DMRS of any one of claims 1 to 11.