CN116707725A

CN116707725A - Demodulation reference signal mapping method, device, communication equipment and storage medium

Info

Publication number: CN116707725A
Application number: CN202210173964.0A
Authority: CN
Inventors: 郑凯立; 刘昊; 孙晓东; 塔玛拉卡·拉盖施; 宋扬
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2023-09-05

Abstract

The application discloses a demodulation reference signal mapping method, a device, communication equipment and a storage medium, which belong to the technical field of communication, and the demodulation reference signal mapping method of the embodiment of the application comprises the following steps: the communication device maps the demodulation reference signal DMRS according to a target mapping rule, wherein the target mapping rule comprises: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

Description

Demodulation reference signal mapping method, device, communication equipment and storage medium

Technical Field

The application belongs to the technical field of communication, and particularly relates to a demodulation reference signal mapping method, a demodulation reference signal mapping device, communication equipment and a storage medium.

Background

In the existing New Radio (NR) system, demodulation reference signals (Demodulation Reference Signal, DMRS) of a data channel support at most 12 ports, so that the number of data streams that can be simultaneously transmitted by the data channel and terminal multiplexing that is cooperatively scheduled is limited, and the transmission capacity of the NR system is affected.

Disclosure of Invention

The embodiment of the application provides a demodulation reference signal mapping method, a demodulation reference signal mapping device, communication equipment and a storage medium, which can improve the transmission capacity of a communication system.

In a first aspect, there is provided a demodulation reference signal mapping method, the method comprising:

the communication device maps the demodulation reference signal DMRS according to a target mapping rule, wherein the target mapping rule comprises: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

In a second aspect, there is provided a demodulation reference signal mapping apparatus, including:

a mapping module, configured to map a demodulation reference signal DMRS according to a target mapping rule, where the target mapping rule includes: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

In a third aspect, there is provided a communication device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.

In a fourth aspect, a terminal is provided, including a processor and a communication interface, where the processor is configured to map a demodulation reference signal DMRS according to a target mapping rule, where the target mapping rule includes: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

In a fifth aspect, a network side device is provided, including a processor and a communication interface, where the processor is configured to map a demodulation reference signal DMRS according to a target mapping rule, where the target mapping rule includes: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

In a sixth aspect, a communication system is provided, comprising: a terminal and a network side device, where the terminal is configured to perform the steps of the demodulation reference signal mapping method according to the first aspect, and the network side device is configured to perform the steps of the demodulation reference signal mapping method according to the first aspect.

In a seventh aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor realizes the steps of the method according to the first aspect.

In an eighth aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor for running a program or instructions implementing the steps of the method according to the first aspect.

In a ninth aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executed by at least one processor to carry out the steps of the method according to the first aspect.

In the embodiment of the present application, P DMRS ports of the N DMRS ports are mapped on each target RB, Q DMRS ports of the N DMRS ports are mapped on each target OFDM symbol group, and the N DMRS ports belong to M code division multiplexing CDM groups. In this way, the DMRS of the data channel may be enabled to support more DMRS ports. Therefore, the embodiment of the application can improve the transmission capacity of the communication system.

Drawings

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

fig. 2 is a flow chart of a demodulation reference signal mapping method according to an embodiment of the present application;

fig. 3a to fig. 3d are diagrams illustrating mapping examples of DMRS ports corresponding to a mapping rule in a demodulation reference signal mapping method according to an embodiment of the present application;

fig. 4a to fig. 4d are diagrams illustrating mapping examples of DMRS ports corresponding to another mapping rule in the mapping method of demodulation reference signals according to the embodiment of the present application;

fig. 5a to fig. 5f are diagrams illustrating mapping examples of DMRS ports corresponding to a mapping rule in a demodulation reference signal mapping method according to another embodiment of the present application;

fig. 6a to fig. 6f are diagrams illustrating mapping examples of DMRS ports corresponding to a mapping rule in a demodulation reference signal mapping method according to another embodiment of the present application;

fig. 7a to fig. 7d are diagrams illustrating mapping examples of DMRS ports corresponding to a mapping rule in a demodulation reference signal mapping method according to another embodiment of the present application;

fig. 8a to fig. 8f are diagrams illustrating mapping examples of DMRS ports corresponding to a mapping rule in a demodulation reference signal mapping method according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a demodulation reference signal mapping device according to an embodiment of the present application;

Fig. 10 is a block diagram of a communication device provided by an embodiment of the present application;

fig. 11 is a block diagram of a terminal according to an embodiment of the present application;

fig. 12 is a block diagram of a network side device according to an embodiment of the present application.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It should be noted that the techniques described in the embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following descriptionA New air interface (NR) system is described for purposes of illustration and NR terminology is used in much of the description below, but the techniques are also applicable to applications other than NR system applications, such as generation 6 (6 ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiment of the present application, only a base station in the NR system is described as an example, and the specific type of the base station is not limited. The core network device may include, but is not limited to, at least one of: core network nodes, core network functions, mobility management entities (Mobility Management Entity, MME), access mobility management functions (Access and Mobility Management Function, AMF), session management functions (Session Management Function, SMF), user plane functions (User Plane Function, UPF), policy control functions (Policy Control Function, PCF), policy and charging rules function units (Policy and Charging Rules Function, PCRF), edge application service discovery functions (Edge Application Server Discovery Function, EASDF), unified data management (Unified Data Management, UDM), unified data repository (Unified Data Repository, UDR), home subscriber server (Home Subscriber Server, HSS), centralized network configuration (Centralized network configuration, CNC), network storage functions (Network Repository Function, NRF), network opening functions (Network Exposure Function, NEF), local NEF (or L-NEF), binding support functions (Binding Support Function, BSF), application functions (Application Function, AF), and the like. It should be noted that, in the embodiment of the present application, only the core network device in the NR system is described as an example, and the specific type of the core network device is not limited.

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

in current NR systems, DMRS is used for channel estimation. For DMRS of a data channel, it can be classified into: DMRS configuration type 1 and DMRS configuration type 2, and both DMRS configuration types support single-symbol and double-symbol structures. The single-symbol structure of the DMRS configuration type 1 maximally supports 4 ports, and the double-symbol structure maximally supports 8 ports; DMRS configuration type 2 single symbol structure supports 6 ports at maximum and dual symbol structure supports 12 ports at maximum. In addition, DMRS configuration type 1 supports 2 code division multiplexing (Code Division Multiplexing, CDM) groups (groups), while DMRS configuration type 2 supports 3 CDM groups.

In the NR system, the DMRS configuration type 1 of the data channel supports at most 8 ports, and the DMRS configuration type 2 supports at most 12 ports, which results in limitation of the number of data streams that the data channel can simultaneously transmit and the multiplexing number of co-scheduled terminals. For this purpose, the demodulation reference signal mapping method of the present application is proposed.

The demodulation reference signal mapping method provided by the embodiment of the application is described in detail below through some embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 2, the demodulation reference signal mapping method provided by the embodiment of the present application includes:

in step 201, the communication device maps the demodulation reference signal DMRS according to a target mapping rule, where the target mapping rule includes: mapping N DMRS ports on K target Resource Blocks (RBs) and L target orthogonal frequency division multiplexing (Orthogonal frequency division multiplex, OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

In the embodiment of the present application, the target OFDM symbol group includes one or two OFDM symbols. For example, in some embodiments, the target set of OFDM symbols satisfies at least one of:

when the DMRS is of a single symbol structure, the target OFDM symbol group includes 1 OFDM symbol;

when the DMRS is of a dual symbol structure, the target OFDM symbol group includes 2 consecutive OFDM symbols.

It should be understood that the above communication device may be understood as a network side device, and may also be understood as a terminal. The P DMRS ports may be understood as some or all of the N DMRS ports, and the Q DMRS ports may be understood as some or all of the N DMRS ports.

Optionally, in some embodiments, OFDM symbols of other OFDM symbol groups than the OFDM symbol group in which the front-load OFDM symbol is located are located in additional positions (additional position) of the DMRS in the L OFDM symbol groups.

Optionally, in some embodiments, the value of M satisfies at least one of:

when the type of the DMRS is a first configuration type, M is equal to 2 or 4;

when the type of the DMRS is the second configuration type, M is equal to 3 or 6.

Optionally, in some embodiments, in a case where q=n and the N DMRS ports map with G RBs as granularity, the value of P satisfies any one of the following: p=n;

wherein G is an even number greater than 0.

In the embodiment of the present application, the value of G may be consistent with the value of the precoding resource block group (Precoding Resource block Group, PRG), and specifically, the value of G may be default agreed by the network side device and the terminal, or may be indicated by signaling, which is not further limited herein.

Optionally, in some embodiments, in a case where p=n and the type of DMRS is the first configuration type, the target mapping rule further includes:

on each OFDM symbol in the target OFDM symbol group, each DMRS port maps with 6 first Resource Elements (REs) in two consecutive target RBs as a basic mapping unit.

In the embodiment of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 6 first REs in two consecutive target RBs. The first configuration type may be understood as a DMRS configuration type associated with DMRS configuration type 1, for example, the first configuration type may be DMRS configuration type 1, or enhanced DMRS configuration type 1.

Optionally, in some embodiments, 4 first REs of the 6 first REs are located in one target RB of the 2 target RBs, and the remaining 2 first REs of the 6 first REs are located in another target RB.

Optionally, in some embodiments, a subcarrier spacing between the 6 first REs satisfies at least one of:

the subcarrier interval between the first 2 first REs in the 4 first REs is 1 RE, and the subcarrier interval between the second 2 first REs is 1 RE;

The subcarrier interval between the last first RE of the first 2 first REs in the 4 first REs and the first RE of the last 2 first REs in the 4 first REs is 6 REs;

the subcarrier spacing between the remaining 2 first REs is 1 RE.

In the embodiment of the application, when the DMRS is of a single symbol structure: the maximum supportable by DMRS is 8 DMRS ports, as shown in fig. 3a to 3 d.

It should be understood that CDM grouping cases of 8 DMRS ports may be set according to actual needs, and different CDM grouping cases will be described below.

Case 1: the 8 DMRS ports respectively belong to 4 CDM groups, and each CDM group includes 2 DMRS ports.

For example, the first DMRS port and the second DMRS port belong to a first CDM group; the third DMRS port and the fourth DMRS port belong to a second CDM group; the fifth DMRS port and the sixth DMRS port belong to a third CDM group; the seventh DMRS port and the eighth DMRS port belong to the fourth CDM group.

Wherein DMRS ports in the same CDM group are CDM multiplexed with a length-2 frequency division orthogonal cover code (Frequency Division-Orthogonal Cover Code, FD-OCC) sequence that acts on two adjacent subcarriers, e.g., subcarriers 0 and 2, subcarriers 8 and 10, and subcarriers 4 and 6 on RB2 for the first DMRS port on RB 1.

Case 2: the 8 DMRS ports respectively belong to 2 CDM groups, wherein each CDM group contains 4 DMRS ports.

For example, the first DMRS port, the second DMRS port, the third DMRS port, and the fourth DMRS port belong to a first CDM group; the fifth DMRS port, the sixth DMRS port, the seventh DMRS port, and the eighth DMRS port belong to the second CDM group.

Wherein, part of DMRS ports in the same CDM group are multiplexed by a length-2 FD-OCC sequence (such as a first DMRS port and a second DMRS port, a third DMRS port and a fourth DMRS port, etc.); some DMRS ports in the same CDM group are FDM multiplexed (e.g., first DMRS port and third DMRS port; second DMRS port and fourth DMRS port, etc.). The FD-OCC sequence of length 2 acts on two adjacent subcarriers.

Optionally, when the DMRS is of a dual symbol structure: the port mapping mode of the DMRS is similar to that of a single-symbol structure, but a Time Division orthogonal cover code (TD-OCC) sequence with the length of 2 is additionally introduced on the basis of the single-symbol structure to act on two continuous OFDM symbols in the DMRS symbol group. At this time, a maximum of 16 DMRS ports can be supported, and each DMRS port belongs to 4 CDM groups, where each CDM group includes 4 DMRS ports. Or respectively belong to 2 CDM groups, wherein each CDM group comprises 8 DMRS ports.

Optionally, in some embodiments, inAnd the target mapping rule further includes:

and on each OFDM symbol in the target OFDM symbol group, each DMRS port maps by taking 6 second REs in one target RB in two continuous target RBs as basic mapping units, wherein the subcarrier interval between two adjacent second REs is 1 RE.

In the embodiment of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 6 second REs in one target RB of two consecutive target RBs, and a subcarrier interval between the 6 second REs is 1 RE.

In the embodiment of the application, when the DMRS is of a single symbol structure: the maximum supportable by DMRS is 8 DMRS ports, as shown in fig. 4a to 4 d.

Wherein DMRS ports in the same CDM group are CDM multiplexed with FD-OCC sequences of length 2, which act on two adjacent subcarriers, e.g., subcarriers 0 and 2, subcarriers 4 and 6, and subcarriers 8 and 10 of the first DMRS port on RB 1.

For example, the first DMRS port, the second DMRS port, the fifth DMRS port, and the sixth DMRS port belong to a first CDM group; the third DMRS port, the fourth DMRS port, the seventh DMRS port, and the eighth DMRS port belong to the second CDM group.

Wherein, part of DMRS ports in the same CDM group are subjected to CDM multiplexing (such as a first DMRS port and a second DMRS port, a fifth DMRS port and a sixth DMRS port and the like) by an FD-OCC sequence with the length of 2; some DMRS ports in the same CDM group are FDM multiplexed (e.g., first DMRS port and fifth DMRS port; second DMRS port and sixth DMRS port, etc.). The FD-OCC sequence of length 2 acts on two adjacent subcarriers.

Note that, when the DMRS is of a dual symbol structure: the port mapping mode of the DMRS is similar to that of a single-symbol structure, but a TD-OCC sequence with the length of 2 is additionally introduced on the basis of the single-symbol structure to act on two continuous OFDM symbols in the DMRS symbol group. At this time, a maximum of 16 DMRS ports can be supported, and each DMRS port belongs to 4 CDM groups, where each CDM group includes 4 DMRS ports. Or respectively belong to 2 CDM groups, wherein each CDM group comprises 8 DMRS ports.

on each OFDM symbol in the target OFDM symbol group, each DMRS port maps by taking 4 third REs in one target RB in two continuous target RBs as basic mapping units.

In the embodiment of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 4 third REs in one target RB of two consecutive target RBs. The second configuration type may be understood as a DMRS configuration type associated with DMRS configuration type 2, for example, the second configuration type may be DMRS configuration type 2, or enhanced DMRS configuration type 2.

Optionally, the subcarrier spacing of the third RE satisfies at least one of the following:

the subcarriers of the first two third REs in the 4 third REs are adjacent, and the subcarriers of the last two third REs are adjacent;

the sub-carriers of the first third RE between the last third RE and the last third RE of the first two third REs of the 4 third REs are 4 REs.

In the embodiment of the application, when the DMRS is of a single symbol structure: the maximum supportable by DMRS is 12 DMRS ports, as shown in fig. 5a to 5 f.

It should be understood that CDM grouping cases of 12 DMRS ports may be set according to actual needs, and different CDM grouping cases will be described below.

Case 1: the 12 DMRS ports respectively belong to 6 CDM groups, and each CDM group includes 2 DMRS ports.

For example, the first DMRS port and the second DMRS port belong to a first CDM group; the third DMRS port and the fourth DMRS port belong to a second CDM group; the fifth DMRS port and the sixth DMRS port belong to a third CDM group; the seventh DMRS port and the eighth DMRS port belong to a fourth CDM group; the ninth DMRS port and the tenth DMRS port belong to a fifth CDM group; the eleventh DMRS port and the twelfth DMRS port belong to the sixth CDM group.

Wherein DMRS ports in the same CDM group are CDM multiplexed with FD-OCC sequences of length 2, the FD-OCC sequences of length 2 acting on two adjacent subcarriers, e.g., subcarriers 0 and 1 of the first DMRS port on RB 1.

Case 2: the 12 DMRS ports respectively belong to 3 CDM groups, and each CDM group includes 4 DMRS ports.

For example, the first DMRS port, the second DMRS port, the seventh DMRS port, and the eighth DMRS port belong to the first CDM group; the third DMRS port, the fourth DMRS port, the ninth DMRS port, and the tenth DMRS port belong to the second CDM group; the fifth DMRS port, sixth DMRS port, eleventh DMRS port, and twelfth DMRS port belong to the third CDM group.

Wherein, part of the DMRS ports in the same CDM group are CDM multiplexed with FD-OCC sequence of length 2 (e.g., first DMRS port and second DMRS port; seventh DMRS port and eighth DMRS port); part of DMRS ports in the same CDM group are FDM multiplexed. The FD-OCC sequence of length 2 acts on two adjacent subcarriers.

Note that, when the DMRS is of a dual symbol structure: the port mapping mode of the DMRS is similar to that of a single-symbol structure, but a TD-OCC sequence with the length of 2 is additionally introduced on the basis of the single-symbol structure to act on two continuous OFDM symbols in the DMRS symbol group. At this time, a maximum of 24 DMRS ports can be supported, and each DMRS port belongs to 6 CDM groups, where each CDM group includes 4 DMRS ports. Or respectively belong to 3 CDM groups, wherein each CDM group comprises 8 DMRS ports.

Optionally, aIn some embodiments, the method comprises, in the following stepsIn the case of (2), the target mapping rule further includes any one of:

in the M CDM groupsThe CDM groups are located at one of the two consecutive target RBs, additionally +.>The CDM groups are located within another target RB;

each of the M CDM groups is located within each of the target RBs.

Optionally, in some embodiments, in a case where q=n, p=n, and the type of DMRS interface is the second configuration type, the target mapping rule further includes:

On each OFDM symbol in the target OFDM symbol group, each DMRS port maps with 2 fourth REs in one target RB as a basic mapping unit, and subcarriers of the 2 fourth REs are adjacent.

In the embodiment of the present application, on each OFDM symbol in the target OFDM symbol group, each DMRS port occupies 2 fourth REs in one target RB, and subcarriers of the 2 fourth REs are adjacent.

In the embodiment of the application, when the DMRS is of a single symbol structure: the maximum supportable by DMRS is 12 DMRS ports, as shown in fig. 6a to 6 f.

Wherein DMRS ports in the same CDM group are CDM multiplexed with FD-OCC sequences of length 2, wherein the FD-OCC sequences of length 2 act on two adjacent subcarriers, e.g., subcarriers 0 and 1 of the first DMRS port on RB 1.

Optionally, in some embodiments, where L is greater than 1 and p=n, the value of Q satisfies any one of the following:

Optionally, the target mapping rule further includes at least one of:

when the type of the DMRS is the first configuration type, mapping each DMRS port by using 6 fifth REs in one target RB as a basic mapping unit on each OFDM symbol in the target OFDM symbol group;

when the DMRS type is the second configuration type, on each OFDM symbol in the target OFDM symbol group, each DMRS port maps with 4 sixth REs in one target RB as a basic mapping unit.

Optionally, in some embodiments, a subcarrier spacing between adjacent fifth REs is one RE.

Optionally, in some embodiments, the subcarrier spacing between the 4 sixth REs satisfies at least one of:

the subcarriers of the first 2 sixth REs of the 4 sixth REs are adjacent, and the subcarriers of the last 2 sixth REs are adjacent;

the subcarrier spacing between the last sixth RE of the first 2 sixth REs of the 4 sixth REs and the first sixth RE of the last 2 sixth REs of the 4 sixth REs is 4 REs.

In the embodiment of the present application, as shown in fig. 7a to 7d, in the case that the DMRS type is the first configuration type, when the DMRS is a single symbol structure: a maximum of 8 DMRS ports can be supported by a DMRS. In this embodiment, the first DMRS port, the second DMRS port, the third DMRS port, and the fourth DMRS port are located on the 3 rd OFDM symbol, and the fifth DMRS port, the sixth DMRS port, the seventh DMRS port, and the eighth DMRS port are located on the 8 th OFDM symbol.

Case 1: the 8 DMRS ports respectively belong to 4 CDM groups, wherein each CDM group contains 2 DMRS ports.

Case 1: the 8 DMRS ports respectively belong to 2 CDM groups, wherein each CDM group contains 4 DMRS ports.

Wherein, part of DMRS ports in the same CDM group are subjected to CDM multiplexing (such as a first DMRS port and a second DMRS port, a fifth DMRS port and a sixth DMRS port and the like) by an FD-OCC sequence with the length of 2; some DMRS ports in the same CDM group perform TDM multiplexing. The FD-OCC sequence of length 2 acts on two adjacent subcarriers.

In the embodiment of the present application, as shown in fig. 8a to 8f, in the case that the DMRS type is the second configuration type, when the DMRS is a single symbol structure: a maximum of 12 DMRS ports can be supported by a DMRS.

Wherein DMRS ports in the same CDM group are CDM multiplexed with FD-OCC sequences of length 2, which act on two adjacent subcarriers, e.g., subcarriers 0 and 1 of the first DMRS port on RB 1.

It should be understood that, in the embodiment of the present application, the index value of each DMRS port in the first to the twenty-fourth DMRS ports may be set according to actual needs, for example, the first DMRS port may be the first DMRS port, may be the last DMRS port, or may be any intermediate DMRS port, where the first DMRS port may be DMRS port 0 (i.e., the index of the DMRS port is numbered from 0).

Optionally, in some embodiments, the CDM group satisfies at least one of:

each CDM group comprises Y DMRS ports, Y is a positive integer, and

DMRS ports in the same CDM group are multiplexed with FD-OCC sequences of length 2 or FD-OCC sequences of length 2 and TD-OCC sequences of length 2.

In the embodiment of the application, when the DMRS is in a single-symbol structure, the DMRS ports in the same CDM group adopt FD-OCC sequences with the length of 2; when the DMRS is in a dual symbol structure, the DMRS ports in the same CDM group are multiplexed with FD-OCC sequences of length 2 and TD-OCC sequences of length 2.

Optionally, in some embodiments, the CDM group satisfies at least one of:

each CDM group comprises Y DMRS ports, Y is a positive integer, and

Optionally, in the case that the N DMRS ports map with G RBs as granularity, the target bandwidth corresponding to the data channel scheduled by the network side device to the terminal satisfies at least one of the following:

the target bandwidth comprises a plurality of RBs, wherein the number of RBs is a multiple of G, and G is an even number larger than 0;

The beam (bundle) parameter associated with the target bandwidth is agreed by a protocol, and the beam parameter corresponds to G RBs and is granularity;

the target bandwidth is segmented into M binding units according to beam parameters, wherein the rule of the segmentation takes a reference point A as a starting position;

in the case of frequency hopping of the data channel, the resource bandwidth corresponding to each hop is a multiple of G, or the starting position of the resource bandwidth corresponding to each hop is the starting position of each binding unit that blocks with the beam parameters.

In the embodiment of the present application, the binding unit may be understood or replaced by a beam unit, and the reference Point a may be referred to as Point a.

It should be noted that, the rule of blocking using the reference point a as the starting position may be understood that the blocking rule is the same as the blocking rule of PRG bundling.

Optionally, in some embodiments, in a case where the N DMRS ports map with G RBs as granularity, a difference between starting positions of scheduling resource bandwidths corresponding to each of the plurality of terminals that are cooperatively scheduled is a multiple of G or 0,G is an even number greater than 0.

In the embodiment of the present application, the Multiple terminals cooperatively scheduled may be referred to as terminals multiplexed by Multiple-User Multiple-Input Multiple-Output (MU-MIMO).

According to the demodulation reference signal mapping method provided by the embodiment of the application, the execution main body can be a demodulation reference signal mapping device. In the embodiment of the present application, the demodulation reference signal mapping device provided in the embodiment of the present application is described by taking an example of a method for performing demodulation reference signal mapping by the demodulation reference signal mapping device.

As shown in fig. 9, an embodiment of the present application provides a demodulation reference signal mapping apparatus 900, including:

a mapping module 901, configured to map a demodulation reference signal DMRS according to a target mapping rule, where the target mapping rule includes: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

Optionally, in the case where q=n and the N DMRS ports map with G RBs as granularity, the value of P satisfies any one of the following: p=n;

wherein G is an even number greater than 0.

Optionally, in the case where p=n and the type of DMRS is the first configuration type, the target mapping rule further includes:

On each OFDM symbol in the target OFDM symbol group, each DMRS port maps with 6 first resource elements REs in two consecutive target RBs as a basic mapping unit.

Optionally, 4 first REs of the 6 first REs are located in one target RB of the 2 target RBs, and the remaining 2 first REs of the 6 first REs are located in another target RB.

Optionally, the subcarrier spacing between the 6 first REs satisfies at least one of:

the subcarrier spacing between the remaining 2 first REs is 1 RE.

Optionally, atAnd the target mapping rule further includes:

Optionally, atAnd the target mapping rule further includes: />

Optionally, atIn the case of (2), the target mapping rule further includes any one of:

each of the M CDM groups is located within each of the target RBs.

Optionally, in the case where q=n, p=n, and the type of DMRS interface is the second configuration type, the target mapping rule further includes:

Alternatively, in the case where L is greater than 1 and p=n, the value of Q satisfies any one of the following:

optionally, the target mapping rule further includes at least one of:

Optionally, the subcarrier spacing between adjacent fifth REs is one RE.

Optionally, the subcarrier spacing between the 4 sixth REs satisfies at least one of:

Optionally, the OFDM symbols of the other OFDM symbol groups except the OFDM symbol group where the leading OFDM symbol is located in the L OFDM symbol groups are located at additional positions of the DMRS.

Optionally, the value of M satisfies at least one of:

when the type of the DMRS is a first configuration type, M is equal to 2 or 4;

Optionally, the target OFDM symbol group satisfies at least one of:

Optionally, the CDM group satisfies at least one of:

each CDM group comprises Y DMRS ports, Y is a positive integer, and/>

the DMRS ports in the same CDM group are multiplexed with a length-2 frequency-division orthogonal masking sequence or with a length-2 frequency-division orthogonal masking sequence and a length-2 time-division orthogonal masking sequence.

the beam parameters associated with the target bandwidth are agreed by a protocol, and the beam parameters correspond to G RBs and are granularity;

The target bandwidth is segmented into M binding units according to the beam parameters, wherein the rule of the segmentation takes a reference point A as a starting position;

Optionally, in the case that the N DMRS ports map with G RBs as granularity, a difference between starting positions of scheduling resource bandwidths corresponding to each of the multiple terminals in coordinated scheduling is a multiple of G or 0,G is an even number greater than 0.

The demodulation reference signal mapping device in the embodiment of the application can be an electronic device, such as an electronic device with an operating system, or can be a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the application are not specifically limited.

The demodulation reference signal mapping device provided by the embodiment of the application can realize each process realized by the method embodiment of fig. 2 and achieve the same technical effect, and in order to avoid repetition, the description is omitted here.

Optionally, as shown in fig. 10, the embodiment of the present application further provides a communication device 1000, including a processor 1001 and a memory 1002, where the memory 1002 stores a program or an instruction that can be executed on the processor 1001, for example, when the communication device 1000 is a terminal, the program or the instruction is executed by the processor 1001 to implement the steps of the above embodiment of the demodulation reference signal mapping method, and the same technical effects can be achieved. When the communication device 1000 is a network side device, the program or the instruction, when executed by the processor 1001, implements the steps of the above embodiment of the demodulation reference signal mapping method, and can achieve the same technical effects, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the processor is used for mapping the demodulation reference signal (DMRS) according to a target mapping rule, and the target mapping rule comprises: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers. The terminal embodiment corresponds to the method embodiment, and each implementation process and implementation manner of the method embodiment are applicable to the terminal embodiment and can achieve the same technical effect. Specifically, fig. 11 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 1100 includes, but is not limited to: at least part of the components of the radio frequency unit 1101, the network module 1102, the audio output unit 1103, the input unit 1104, the sensor 1105, the display unit 1106, the user input unit 1107, the interface unit 1108, the memory 1109, and the processor 1110, etc.

Those skilled in the art will appreciate that the terminal 1100 may further include a power source (e.g., a battery) for powering the various components, and that the power source may be logically coupled to the processor 1110 by a power management system so as to perform functions such as managing charging, discharging, and power consumption by the power management system. The terminal structure shown in fig. 11 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 1104 may include a graphics processing unit (Graphics Processing Unit, GPU) 11041 and a microphone 11042, the graphics processor 11041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 1106 may include a display panel 11061, and the display panel 11061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072. The touch panel 11071 is also referred to as a touch screen. The touch panel 11071 may include two parts, a touch detection device and a touch controller. Other input devices 11072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In the embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 1101 may transmit the downlink data to the processor 1110 for processing; in addition, the radio frequency unit 1101 may send uplink data to the network side device. Typically, the radio frequency unit 1101 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

Memory 1109 may be used to store software programs or instructions and various data. The memory 1109 may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 1109 may include volatile memory or nonvolatile memory, or the memory 1109 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 1109 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

Processor 1110 may include one or more processing units; optionally, the processor 1110 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1110.

The processor 1110 is configured to map the demodulation reference signal DMRS according to a target mapping rule, where the target mapping rule includes: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers.

wherein G is an even number greater than 0.

the subcarrier spacing between the remaining 2 first REs is 1 RE.

Optionally, atAnd the target mapping rule further includes:

each of the M CDM groups is located within each of the target RBs.

optionally, the target mapping rule further includes at least one of:

Optionally, the subcarrier spacing between adjacent fifth REs is one RE.

Optionally, the value of M satisfies at least one of:

when the type of the DMRS is a first configuration type, M is equal to 2 or 4;

Optionally, the target OFDM symbol group satisfies at least one of:

Optionally, the CDM group satisfies at least one of:

each CDM group comprises Y DMRS ports, Y is a positive integer, and

The embodiment of the application also provides a network side device, which comprises a processor and a communication interface, wherein the processor is used for mapping the demodulation reference signal (DMRS) according to a target mapping rule, and the target mapping rule comprises: mapping N DMRS ports on K target Resource Blocks (RBs) and L target Orthogonal Frequency Division Multiplexing (OFDM) symbol groups; and mapping P DMRS ports in the N DMRS ports on each target RB, mapping Q DMRS ports in the N DMRS ports on each target OFDM symbol group, wherein the N DMRS ports belong to M code division multiplexing CDM groups, and N, K, L, Q and M are positive integers. The network side device embodiment corresponds to the method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 12, the network side device 1200 includes: an antenna 1201, a radio frequency device 1202, a baseband device 1203, a processor 1204, and a memory 1205. The antenna 1201 is connected to a radio frequency device 1202. In the uplink direction, the radio frequency device 1202 receives information via the antenna 1201 and transmits the received information to the baseband device 1203 for processing. In the downlink direction, the baseband device 1203 processes information to be transmitted, and transmits the processed information to the radio frequency device 1202, and the radio frequency device 1202 processes the received information and transmits the processed information through the antenna 1201.

The method performed by the network side device in the above embodiment may be implemented in the baseband apparatus 1203, and the baseband apparatus 1203 includes a baseband processor.

The baseband device 1203 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 12, where one chip, for example, a baseband processor, is connected to the memory 1205 through a bus interface, so as to call a program in the memory 1205 to perform the network device operation shown in the above method embodiment.

The network-side device may also include a network interface 1206, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 1200 of the embodiment of the present application further includes: instructions or programs stored in the memory 1205 and executable on the processor 1204, the processor 1204 invokes the instructions or programs in the memory 1205 to perform the method performed by the modules shown in fig. 9 and achieve the same technical effects, and are not described herein in detail for the sake of avoiding repetition.

The embodiment of the application also provides a readable storage medium, on which a program or an instruction is stored, which when executed by a processor, implements each process of the above embodiment of the demodulation reference signal mapping method, and can achieve the same technical effects, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip comprises a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running a program or instructions, the various processes of the demodulation reference signal mapping method embodiment can be realized, the same technical effects can be achieved, and the repetition is avoided, and the description is omitted here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product, where the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement each process of the above embodiment of the demodulation reference signal mapping method, and the same technical effects are achieved, so that repetition is avoided and details are not repeated herein.

The embodiment of the application also provides a communication system, which comprises: the terminal is configured to execute each process of the method embodiments shown in fig. 2 and described above, and the network side device is configured to execute each process of the method embodiments shown in fig. 2 and described above, so as to achieve the same technical effects, and to avoid repetition, details are not repeated here.

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. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

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 application may be embodied essentially or in a part contributing to the prior art in the form of a computer 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 network device, etc.) to perform the method according to the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application 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 application and the scope of the claims, which are to be protected by the present application.

Claims

1. A demodulation reference signal mapping method, comprising:

2. The method of claim 1, wherein, in the case where q=n and the N DMRS ports map with G RBs as granularity, the value of P satisfies any of the following: p=n;

wherein G is an even number greater than 0.

3. The method of claim 2, wherein in the case where p=n and the type of DMRS is the first configuration type, the target mapping rule further comprises:

4. The method of claim 3, wherein 4 of the 6 first REs are located within one of the 2 target RBs and the remaining 2 of the 6 first REs are located within another target RB.

5. The method of claim 4, wherein a subcarrier spacing between the 6 first REs satisfies at least one of:

the subcarrier spacing between the remaining 2 first REs is 1 RE.

6. The method according to claim 2, characterized in that, in the followingAnd the target mapping rule further includes:

7. The method according to claim 2, characterized in that, in the followingAnd the target mapping rule further includes:

8. The method of claim 7, wherein the subcarrier spacing of the third RE satisfies at least one of:

9. The method according to claim 2, characterized in that, in the followingIn the case of (2), the target mapping rule further includes any one of:

each of the M CDM groups is located within each of the target RBs.

10. The method of claim 1, wherein in the case where q=n, p=n, and the type of DMRS interface is the second configuration type, the target mapping rule further comprises:

11. The method according to claim 1, wherein in the case where L is greater than 1 and p=n, the value of Q satisfies any one of the following:

12. the method of claim 11, wherein the target mapping rule further comprises at least one of:

13. The method of claim 12, wherein a subcarrier spacing between adjacent ones of the fifth REs is one RE.

14. The method of claim 12, wherein subcarrier spacing between the 4 sixth REs satisfies at least one of:

15. The method of claim 1, wherein OFDM symbols of the other OFDM symbol groups of the L OFDM symbol groups are located at additional positions of the DMRS, except for the OFDM symbol group where the preceding OFDM symbol is located.

16. The method of claim 1, wherein the value of M satisfies at least one of:

when the type of the DMRS is a first configuration type, M is equal to 2 or 4;

17. The method of claim 1, wherein the target set of OFDM symbols satisfies at least one of:

18. The method of claim 1, wherein the CDM group satisfies at least one of:

Each CDM group comprises Y DMRS ports, Y is a positive integer, and

19. The method of claim 1, wherein, in the case that the N DMRS ports map with G RBs as granularity, a target bandwidth corresponding to a data channel scheduled by the network side device to the terminal satisfies at least one of:

20. The method of claim 1, wherein, in the case where the N DMRS ports map with G RBs as granularity, a difference between starting positions of scheduling resource bandwidths corresponding to each of the plurality of terminals cooperatively scheduled is a multiple of G or 0,G is an even number greater than 0.

21. A demodulation reference signal mapping apparatus, comprising:

22. The apparatus of claim 21, wherein, in the case where q=n and the N DMRS ports map with G RBs as granularity, the value of P satisfies any of the following: p=n;

wherein G is an even number greater than 0.

23. The apparatus of claim 22, wherein in the case where p=n and the type of DMRS is the first configuration type, the target mapping rule further comprises:

24. The device of claim 22Characterized in thatAnd the target mapping rule further includes:

25. The apparatus of claim 22, wherein, in the case ofAnd the target mapping rule further includes:

26. The apparatus of claim 22, wherein, in the case ofIn the case of (2), the target mapping rule further includes any one of:

each of the M CDM groups is located within each of the target RBs.

27. The apparatus of claim 21, wherein in the case where q=n, p=n, and the type of DMRS interface is the second configuration type, the target mapping rule further comprises:

28. The apparatus of claim 21, wherein in the case where L is greater than 1 and P = N, the value of Q satisfies any one of:

29. the apparatus of claim 28, wherein the target mapping rule further comprises at least one of:

30. A communication device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the demodulation reference signal mapping method according to any one of claims 1 to 20.

31. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the demodulation reference signal mapping method according to any one of claims 1 to 20.