CN116419273A

CN116419273A - Communication method and device

Info

Publication number: CN116419273A
Application number: CN202111668447.2A
Authority: CN
Inventors: 董昶钊; 高翔; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2023-07-11
Also published as: WO2023125761A1

Abstract

The application provides a communication method and a communication device, which are used for expanding ports and increasing transmission stream numbers. According to the method, the terminal device can receive the indication information and determine the port index corresponding to the reference signal according to the indication information. The indication information can be used for indicating that the port belongs to a first port set or a second port set, wherein the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped. The time-frequency resources occupied by the at least one second time-frequency resource group are subsets of the time-frequency resources occupied by the first time-frequency resource group, so that the second port set can support more ports compared with the first port set, and the method can realize port expansion and increase of the number of transmission streams.

Description

Communication method and device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

The demodulation reference signals (demodulation reference signal, DMRS) can be used to estimate an equivalent channel matrix of a data channel (e.g., physical downlink shared channel (physical downlink shared channel, PDSCH)) or a control channel (e.g., physical downlink control channel (physical downlink control channel, PDCCH)) for data detection and demodulation. Generally, one DMRS port (port) corresponds to one spatial layer, and each spatial layer corresponds to one data stream. For a multiple-input multiple-output (multiple input and multiple output, MIMO) transmission with a number of transmission streams R, the number of DMRS ports required is R. In the fifth generation (5G) communication system, 2 DMRS resource mapping types, type 1 (Type 1) DMRS and Type2 (Type 2) DMRS, are supported by New Radio (NR). For a Type 1 (Type 1) DMRS resource mapping Type, a maximum of 8 orthogonal DMRS ports can be supported; for Type2 (Type 2) DMRS resource mapping types, a maximum of 12 orthogonal DMRS ports may be supported. Thus, at present, NR can only support MIMO transmission of 12 streams at maximum.

As future wireless communication device deployments become denser, the number of terminal devices increases further, which puts higher (greater than 12 streams) demands on MIMO transport streams, and the mapping manner between ports and time-frequency resources needs to be improved.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for improving a mapping mode between ports and time-frequency resources so as to improve the number of transmission streams.

In a first aspect, the present application provides a communication method. The method may be performed by the terminal device or a chip in the terminal device.

Taking the terminal equipment to execute the method as an example, according to the method, the terminal equipment can receive indication information, wherein the indication information is used for indicating that a port belongs to a first port set or a second port set, the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group; the terminal equipment can also determine the port index corresponding to the reference signal according to the indication information.

By adopting the method, the terminal equipment can determine the port index corresponding to the reference signal according to the indication information, wherein the indication information can indicate the ports in the first port set or the second port set, and the time-frequency resources occupied by at least one second time-frequency resource group are subsets of the time-frequency resources occupied by the first time-frequency resource group, so that the second port set can support more ports compared with the first port set, and the method can realize port expansion and increase of the transmission stream number.

In one possible implementation manner, the number of time-frequency resources occupied by the N first time-frequency resource groups and the M second time-frequency resource groups is the same. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In one possible implementation, the at least one first time-frequency resource group occupies the same time-frequency resources as the at least two second time-frequency resource groups. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In one possible implementation, the number of time-frequency resources occupied by at least one first time-frequency resource group is twice the number of time-frequency resources occupied by one second time-frequency resource group. By adopting the implementation mode, the port expansion can be realized more flexibly.

In one possible implementation, the N first time-frequency resource groups occupy the same time unit as the M second time-frequency resource groups. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In one possible implementation, the subcarriers occupied by the at least one second set of time-frequency resources in one frequency domain unit are a subset of one first set of time-frequency resources. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In one possible implementation, the time-frequency resources in the M second time-frequency resource groups are equally spaced. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In one possible implementation, the ports in the second set of ports correspond to comb teeth 4; alternatively, the ports in the second set of ports correspond to the comb teeth 6. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In one possible implementation, the first port set corresponds to 2 CDM groups, and the second port set corresponds to 3 or 4 CDM groups; or, the first port set corresponds to 3 CDM groups, and the second port set corresponds to 4, 5, or 6 CDM groups. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In a possible implementation manner, the first port set corresponds to a first reference signal sequence

Said first reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

where k is an integer greater than 0, l 'is 0 or 1, β is a non-zero complex number, w (k'), w (l ') is a frequency domain and time domain mask, respectively, and r (2n+k') is an element of the base sequence r mapped on the kth subcarrier and the first symbol. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

In a possible implementation manner, the second port set corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

Said second reference signal sequence +. >

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

n＝0，1，…

where k is an integer greater than 0, l ' is 0 or 1, β is a non-zero complex number, w (k '), w (l ') is a frequency domain and time domain mask, respectively, and r (n) is an element of the base sequence r mapped on the kth subcarrier and the ith symbol.

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and 1 st symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1，2

n＝0，1，…

where k is an integer greater than 0, l 'is 0 or 1, β is a non-zero complex number, w (k'), w (l ') is a frequency domain and time domain mask, respectively, c is 1 or 2, indicating the comb-splitting capability of the reference signal port, and r (2n+k') is the element of the base sequence r mapped on the kth subcarrier and the kth symbol. By adopting the implementation mode, the port expansion can be realized more flexibly and conveniently.

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1or2

n＝0，1，...

where k is an integer greater than 0, l ' is 0 or 1, β is a non-zero complex number, w (k '), w (l ') is a frequency domain and time domain mask, respectively, c is 1 or 2, indicating the comb splitting capability of the reference signal port, and r (n) is the element of the base sequence r mapped on the kth subcarrier and the first symbol.

In one possible implementation, the network device may flexibly select to use the first port set or the second port set described in the present application according to the total number of currently scheduled reference signal ports, that is, indicate the selected port through the indication information. For example, the current reference signal is configured as type1 single symbol, the maximum supported port number is 4, the total number of ports of the current scheduled reference signal of the network device is 6, and the ports in the second port set may be selected correspondingly.

In a second aspect, the present application provides a communication method. The method may be performed by a network device or a chip in a network device. Wherein the network device is a radio access network device such as a base station.

Taking the example that the network device is an execution body, the method may include: the network equipment sends indication information, wherein the indication information is used for a port belonging to a first port set or a second port set, the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the number of the time-frequency resources occupied by the N first time-frequency resource groups and the M second time-frequency resource groups is the same; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group.

In one possible implementation manner, the number of time-frequency resources occupied by the N first time-frequency resource groups and the M second time-frequency resource groups is the same.

In one possible implementation, the at least one first time-frequency resource group occupies the same time-frequency resources as the at least two second time-frequency resource groups.

In one possible implementation, the number of time-frequency resources occupied by at least one first time-frequency resource group is twice the number of time-frequency resources occupied by one second time-frequency resource group.

In one possible implementation, the N first time-frequency resource groups occupy the same time unit as the M second time-frequency resource groups.

In one possible implementation, the subcarriers occupied by the at least one second set of time-frequency resources in one frequency domain unit are a subset of one first set of time-frequency resources.

In one possible implementation, the time-frequency resources in the M second time-frequency resource groups are equally spaced.

In one possible implementation, the ports in the second set of ports correspond to comb teeth 4; alternatively, the ports in the second set of ports correspond to the comb teeth 6.

In one possible implementation, the first port set corresponds to 2 CDM groups, and the second port set corresponds to 3 or 4 CDM groups; or, the first port set corresponds to 3 CDM groups, and the second port set corresponds to 4, 5, or 6 CDM groups.

Said first reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

where k is an integer greater than 0, l 'is 0 or 1, β is a non-zero complex number, w (k'), w (l ') is a frequency domain and time domain mask, respectively, and r (2n+k') is an element of the base sequence r mapped on the kth subcarrier and the first symbol.

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

n＝0，1，…

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

n＝0，1，…

The saidSecond reference signal sequence->

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1，2

n＝0，1，…

where k is an integer greater than 0, l 'is 0 or 1, β is a non-zero complex number, w (k'), w (l ') is a frequency domain and time domain mask, respectively, c is 1 or 2, indicating the comb-splitting capability of the reference signal port, and r (2n+k') is the element of the base sequence r mapped on the kth subcarrier and the kth symbol.

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1or2

n＝0，1，…

In a third aspect, the present application provides a communication device. The communication device may be adapted to carry out the functions of the first aspect or any one of the possible designs of the first aspect. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software, where the hardware or software includes one or more modules corresponding to the functions or method steps or operations in the first aspect and any design thereof. In particular, the communication means may be a terminal device or a chip in a terminal device.

In one possible example, the communication device may include a communication module (or communication unit) and a processing module (or processing unit). The communication module can be used for the communication device to communicate, and the processing module can be used for the communication device to realize the processing function of the communication device.

The communication module can be used for receiving indication information, wherein the indication information is used for indicating that a port belongs to a first port set or a second port set, the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group; the processing module can be used for determining the port index corresponding to the reference signal according to the indication information.

The above description and definitions of the meaning of the first port set, the second port set, the first time-frequency resource group and the second time-frequency resource group etc. may be referred to the corresponding description in the first aspect, the second aspect or any possible implementation thereof.

In a fourth aspect, the present application provides a communication device. The communication device may be adapted to perform the functions of the second aspect or any of the possible designs of the second aspect. The functions may be implemented by hardware, or by execution of corresponding software by hardware, including one or more modules corresponding to the functions or method steps or operations in the second aspect and any design thereof. In particular, the communication means may be a network device or a chip in a network device.

The processing module can be used for determining indication information, wherein the indication information is used for the ports belonging to a first port set or a second port set, the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the number of the time-frequency resources occupied by the N first time-frequency resource groups and the M second time-frequency resource groups is the same; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group; the communication module may be configured to transmit the indication information.

In a fifth aspect, the present application provides a communication system. Illustratively, the communication system may comprise communication means for implementing any one of the possible designs of the first aspect or the first aspect, and communication means for implementing any one of the possible designs of the second aspect or the second aspect. In particular, the communication system may comprise the communication device according to the third aspect and/or the communication device according to the fourth aspect.

In a sixth aspect, the present application provides a computer storage medium comprising program instructions which, when executed on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the second aspect or the second aspect.

In a seventh aspect, embodiments of the present application provide a computer program product, which when run on a computer, causes the computer to perform the method of the first aspect or any one of the possible designs of the second aspect.

In an eighth aspect, embodiments of the present application provide a chip system, which may include a processor, and may further include a memory (or the system chip is coupled to the memory), where the chip system executes program instructions in the memory to perform the method of the first aspect or any one of the possible designs of the first aspect, or the second aspect or any one of the possible designs of the second aspect. Where "coupled" means that the two elements are directly or indirectly joined to each other, e.g., coupled may mean that the two elements are electrically connected.

The advantages of the methods according to the second to eighth aspects above may be referred to as the advantages of the corresponding methods according to the first aspect, and are not specifically expanded here for the sake of economy.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a DMRS resource mapping pattern;

fig. 3 is a logic schematic diagram of a reference signal sequence and resource block relationship provided in an embodiment of the present application;

fig. 4 is a flow chart of a DMRS transmission method;

fig. 5 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 6 is a schematic diagram of a DMRS resource mapping pattern provided in an embodiment of the present application;

Fig. 7 is a schematic diagram of another DMRS resource mapping pattern provided in an embodiment of the present application;

fig. 8 is a schematic diagram of another DMRS resource mapping pattern provided in an embodiment of the present application;

fig. 9 is a schematic diagram of another DMRS resource mapping pattern provided in an embodiment of the present application;

fig. 10 is a flow chart of another communication method according to an embodiment of the present application;

fig. 11 is a flow chart of another communication method according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

In order to increase the number of data transmission streams, the present application provides a communication method. The present application will be described in further detail with reference to the accompanying drawings. It should be appreciated that the specific methods of operation described in the method embodiments described below may also be applied in device embodiments or system embodiments.

The technical solutions in the present application will be described below with reference to the accompanying drawings.

Wireless communication systems mentioned in embodiments of the present application include, but are not limited to: global mobile communication (global system of mobile communication, GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (General Packet Radio Service, GPRS), long term evolution (long term evolution, LTE) system, long term evolution-advanced (LTE-a) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile communication system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, 5G, a converged system of multiple access systems, or three-major application scenarios of an evolution system, 5G mobile communication system enhance mobile broadband (enhanced mobile broadband, eMBB), ultra-reliable low-latency communication (ultra reliable and low-latency communication, URLLC) and enhanced machine type communication (enhanced machine type communication, eMTC) or new communication systems in the future.

The network device according to the embodiment of the present application may be any device having a wireless transceiver function or a chip that may be disposed on the device, where the device includes, but is not limited to: an evolved node B (eNB), a radio network controller (radio network controller, RNC), a Node B (NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved node B (home evolved NodeB), or Home Node B (HNB)), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP/TP), or a remote radio head (remote radio head, RRH), etc., may also be a 5G, e.g., a gNB in an NR system, or a transmission point, one or a set of antenna panels (including multiple antenna panels) of a base station in a 5G system, or may also be a network node, e.g., a unit, or a Distributed Unit (DU), etc., constituting a gNB or transmission point.

In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

The network device may illustratively be a scheduling device, in which case the network device may include, for example, but is not limited to: LTE base station eNB, NR base station gNB, operator, etc., the functions of which may include, for example: the uplink and downlink resources are arranged, and downlink control information (downlink control information, DCI) is transmitted in the base station scheduling mode. The network device may also serve as a transmitting device, for example, in which case the network device may include, but is not limited to: TRP, RRH, the functions of which may for example comprise: and performing downlink signal transmission and uplink signal reception.

The terminal device referred to in the embodiments of the present application may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiments of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a wearable device, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like. The embodiments of the present application are not limited to application scenarios. The terminal device and the chip that can be set in the terminal device are collectively referred to as a terminal device in this application.

The functions of the terminal device may include, for example, but not limited to: the reception of the downlink/sidelink signal and/or the transmission of the uplink/sidelink signal are performed.

In the present application, description of a downlink control channel is performed by taking a physical downlink control channel PDCCH as an example, description of a downlink data channel is performed by taking a physical downlink shared channel PDSCH as an example, description of a frequency domain unit is performed by taking a carrier as an example, description of a time unit in a 5G system is performed by taking a time slot as an example, and a time slot referred to in the present application may also be a transmission time interval TTI and/or a time unit and/or a subframe and/or a mini-slot.

Fig. 1 is a schematic diagram of a communication system using the transmission information of the present application. As shown in fig. 1, the communication system 100 includes a network device 102, and the network device 102 may include multiple antennas, such as

antennas

104, 106, 108, 110, 112, and 114. In addition, network device 102 may additionally include a transmitter chain and a receiver chain, each of which may include a number of components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.) related to signal transmission and reception, as will be appreciated by one skilled in the art.

Network device 102 may communicate with a plurality of terminal devices (e.g., terminal device 116 and terminal device 122). However, it is to be appreciated that network device 102 can communicate with any number of terminal devices similar to

terminal devices

116 or 122.

Terminal devices

116 and 122 can be, for example, cellular telephones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100.

As shown in fig. 1, terminal device 116 is in communication with

antennas

112 and 114, where

antennas

112 and 114 transmit information to terminal device 116 over forward link 118 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with

antennas

104 and 106, where

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

For example, in a frequency division duplex system, forward link 118 may use a different frequency band than reverse link 120, and forward link 124 may use a different frequency band than reverse link 126, for example.

As another example, in time division duplex systems and full duplex (full duplex) systems, forward link 118 and reverse link 120 may use a common frequency band and forward link 124 and reverse link 126 may use a common frequency band.

Each antenna (or group of antennas) and/or area designed for communication is referred to as a sector of network device 102. For example, antenna groups can be designed to communicate to terminal devices in a sector of the areas covered by network device 102. During communication of network device 102 with

terminal devices

116 and 122 via forward links 118 and 124, respectively, the transmit antennas of network device 102 may utilize beamforming to improve signal-to-noise ratio of forward links 118 and 124. Furthermore, mobile devices in neighboring cells may experience less interference when network device 102 transmits signals to

terminal devices

116 and 122 that are randomly dispersed throughout the area of the associated coverage using beamforming, than when the network device transmits signals to all its terminal devices through a single antenna.

At a given time, network device 102, terminal device 116, or terminal device 122 can be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting apparatus may acquire (e.g., generate, receive from other communication apparatuses, or save in memory, etc.) a number of data bits to be transmitted to the wireless communication receiving apparatus through the channel. Such data bits may be contained in a transport block (or multiple transport blocks) of data, which may be segmented to produce multiple code blocks.

In addition, the communication system 100 may be a public land mobile network (public land mobile network, PLMN) network, a D2D network, an M2M network, or other networks, fig. 1 is merely a simplified schematic diagram, and other network devices may be included in the network, which are not shown in fig. 1.

In this embodiment of the present application, the transmitting device may be the above-mentioned network device 102 or a terminal device (for example, the terminal device 116 or the terminal device 122), and the corresponding receiving device may be the above-mentioned terminal device (for example, the terminal device 116 or the terminal device 122) or the network device 102, which is not particularly limited in this application.

It can be understood that, in the embodiments of the present application, the DMRS is taken as an example for signal transmission, and other signal types suitable for the embodiments of the present application are all within the protection scope of the present application, which is not particularly limited in the present application.

In order to facilitate understanding of the embodiments of the present application, the following is a brief description of the terms and contexts referred to in this application.

1. Antenna port (antenna port)

The antenna ports are simply referred to as ports. It is understood as a transmitting antenna identified by the receiving end or a transmitting antenna that is spatially distinguishable. One antenna port may be configured for each virtual antenna, which may be a weighted combination of multiple physical antennas. The antenna ports may be divided into reference signal ports and data ports according to the difference of the carried signals. Among them, reference signal ports include, for example, but not limited to, demodulation reference signal (demodulation reference signal, DMRS) ports, channel state information reference signal (channel state information reference signal, CSI-RS) ports, and the like.

The application comprises an existing port and a newly added port, wherein the existing port refers to a port in an existing protocol or a port supporting a technical scheme in the existing protocol; the newly added port refers to a port capable of supporting the technical scheme of the application.

2. Time-frequency resource

In the embodiment of the application, the data or the information may be carried by a time-frequency resource, where the time-frequency resource may include a resource in a time domain and a resource in a frequency domain. Where in the time domain, the time-frequency resource may comprise one or more time-domain units (alternatively referred to as time units, time units), and in the frequency domain, the time-frequency resource may comprise one or more frequency-domain units.

Where a time domain unit may be one symbol or several symbols (e.g., orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols), or a mini-slot (mini-slot), or a slot (slot), or a subframe (subframe), where a subframe may have a duration of 1 millisecond (ms) in the time domain, a slot may be composed of 7 or 14 symbols, and a mini-slot may include at least one symbol (e.g., 2 symbols or 7 symbols or 14 symbols, or any number of symbols less than or equal to 14 symbols). The above-mentioned time domain unit sizes are merely for convenience of understanding the solution of the present application, and are not limited to the protection scope of the embodiments of the present application, and it is understood that the above-mentioned time domain unit sizes may be other values, which are not limited in the present application.

A frequency domain unit may be a Resource Block (RB), or a subcarrier (subcarrier), or a resource block group (resource block group, RBG), or a predefined subband (subband), or a precoding resource block group (precoding resource block group, PRG), or a bandwidth part (BWP), or a Resource Element (RE), or a carrier, or a serving cell.

The transmission unit mentioned in the embodiments of the present application may include any one of the following: the time domain unit, the frequency domain unit, or the time-frequency unit, for example, the transmission unit mentioned in the embodiments of the present application may be replaced by a time domain unit, or may be replaced by a frequency domain unit, or may be replaced by a time-frequency unit. As another example, the transmission unit may also be replaced with a transmission opportunity. Wherein the time domain unit may comprise one or more OFDM symbols, or the time domain unit may comprise one or more slots, etc. The frequency domain unit may include one or more RBs, or the frequency domain unit may include one or more subcarriers, or the like.

3. Space layer

For spatial multiplexing multiple-input multiple-output MIMO systems, multiple parallel data streams can be transmitted simultaneously on the same time-frequency resource, and each data stream is called a spatial layer or spatial stream.

4、DMRS

The DMRS is used to estimate an equivalent channel matrix experienced by a data channel (e.g., PDSCH) or a control channel (e.g., PDCCH), thereby being used for detection and demodulation of data. Taking the data channel PDSCH as an example, the DMRS is usually precoded identically to the transmitted data signal, so as to ensure that the DMRS and the data experience the same equivalent channel. Assuming that the DMRS vector sent by the sending end is s, the sent data symbol vector is x, and the DMRS and the data perform the same precoding operation (multiply by the same precoding matrix P), the corresponding received signal vector of the receiving end may be expressed as:

data:

DMRS：

for both the data signal and the reference signal, the experienced equivalent channels are

The receiving end can obtain an equivalent channel by using a channel estimation algorithm (such as Least Square (LS) channel estimation, minimum mean square error (minimum mean squared error, MMSE) channel estimation, etc.) based on the known DMRS vector s>

Is a function of the estimate of (2). MIMO equalization and subsequent demodulation of the data signal may be accomplished based on the equivalent channel. / >

Since DMRS is used to estimate equivalent channel

Its dimension is N _R X R, where N _R For the number of receive antennas, R is the transport stream number (rank). Generally, one DMRS port corresponds to one spatial layer. For MIMO transmission with a number of transmission streams R, the number of DMRS ports required is R. To ensure the quality of the channel estimation, the different DMRS ports are typically orthogonal ports. DMRS symbols corresponding to different DMRS ports are orthogonal in the frequency domain, time-frequency domain or code domain. At present, 5G NR supports 2 DMRS resource mapping types. For a type 1 (or configuration type 1) DMRS, a maximum of 8 orthogonal ports can be supported; for a type 2 (or configuration type 2) DMRS, a maximum of 12 orthogonal ports may be supported. Thus, at present, NR can only support MIMO transmission of 12 streams at maximum.

DMRS is an important reference signal for detection by the receiving end. The DMRS is transmitted along with a data channel (e.g., PDSCH) of the transmission. The NR DMRS ports are orthogonal DMRS ports, i.e. the DMRS symbols corresponding to different DMRS ports are frequency division multiplexed and/or code division multiplexed. For one DMRS port, in order to perform channel estimation on different time-frequency resources, to ensure channel estimation quality, multiple DMRS symbols need to be sent in multiple time-frequency resources.

Next, a method for transmitting and receiving DMRS according to an embodiment of the present application will be described in detail with reference to fig. 4.

It should be noted that, in the embodiment of the present application, the sending device (for example, the first sending device) may be a network device (for example, an access network device) or a terminal device, and the present application is not particularly limited, and when the sending device is a network device, actions performed by the network device in the following description may be performed; when the transmitting device is a terminal device, actions performed by the terminal device in the following description may be performed.

Similarly, the receiving device (e.g., the first receiving device) may be a network device (e.g., an access network device) or a terminal device, and the present application is not particularly limited, and when the receiving device is a network device, actions performed by the network device in the following description may be performed; when the receiving device is a terminal device, actions performed by the terminal device in the following description may be performed.

Fig. 4 shows a schematic interaction diagram of a method 200 for transceiving reference signals. As shown in fig. 4, at S010, the transmitting apparatus #a (i.e., an example of the first transmitting apparatus) determines the antenna port #a of the reference signal #a. At S020, the transmitting device #a determines (or generates) a reference signal #a (e.g., DMRS #a) (i.e., an example of the first DMRS). The process of generating dmrs#a may be similar to the prior art, and detailed descriptions thereof are omitted herein to avoid redundancy.

It should be understood that the steps shown in fig. 4 are by way of example and not limitation.

In the embodiment of the present application, the dmrs#a is a DMRS of a type #a (i.e., an example of the first type).

Thereafter, the transmitting device #a may determine an antenna port of the DMRS #a, hereinafter, for ease of understanding and distinction, it is noted that: antenna port #a. The antenna port #a is only for corresponding to the DMRS #a, and the number of antenna ports is not limited, that is, the antenna port #a may represent one or more antenna ports.

As an example and not by way of limitation, in the embodiment of the present application, the antenna port of the DMRS may be determined by the network device and issued to the terminal device by RRC signaling, MAC signaling, physical layer signaling (such as DCI signaling), or the like. Thus, when the transmitting device #a is a network device, the transmitting device #a can determine the antenna port #a by itself; when the transmitting device #a is a terminal device, the transmitting device #a may determine the antenna port #a according to an instruction of a network device to which it is connected.

The antenna port #a is an antenna port which can be supported by the transmitting apparatus #a, and includes an existing port and a newly added port. For the newly added port, the UE may report the capability of supporting the newly added port, and the network device may allocate a port to the UE based on the reported capability.

In one possible implementation, the antenna port of the first DMRS is determined from all antenna ports supported by the transmitting device.

In the embodiment of the present application, the transmitting device can support multiple antenna ports, specifically, can support transmitting signals (for example, DMRS) through each of the multiple antenna ports.

In the prior art, each type of DMRS can only transmit through the antenna port corresponding to that type of DMRS. The antenna ports of the DMRS may correspond to the antenna port indexes, and the antenna ports corresponding to the DMRS may be 0,1,2, …,11, or may be 1000, 1001, 1002, …,1011. Or the antenna port index corresponding to the DMRS may be 0,1,2, …,11, or the antenna port index corresponding to the DMRS may be 1000, 1001, 1002, …,1011.

In contrast, in the embodiment of the present application, each type of DMRS can transmit through any one of all antenna ports supported by the transmitting apparatus.

That is, in the embodiment of the present application, the antenna ports in the configuration pattern (or referred to as pattern) may not be bound to the type of DMRS, or, each type of DMRS may be transmitted through any antenna port in the configuration pattern.

It should be appreciated that the configuration pattern may be a formula, table, or illustration of a rule characterizing the sequence elements and the time-frequency resource mapping, which is not limited in this application. It should also be appreciated that the configuration pattern may be indicated by the network device or may be predefined, as this is not limiting in this application.

As an example and not by way of limitation, for example, assuming that the configuration pattern may include a time-frequency resource corresponding to each of 8 antenna ports with antenna port indexes a to h, the transmitting device #a may support all antenna ports in the configuration pattern. The transmitting apparatus #a may transmit the DMRS #a using the antenna ports a and b in one period and transmit the DMRS #a using the antenna ports e and f in another period.

Further, if the transmitting apparatus #a is a network apparatus, the transmitting apparatus #a may notify the receiving apparatus of the antenna port index and/or the number of antenna ports used by the DMRS #a through RRC signaling, MAC signaling, physical layer signaling, or the like.

If the transmitting device #a is a terminal device, the transmitting device #a may determine an antenna port index and/or the number of antenna ports used by the DMRS #a by receiving RRC signaling, MAC signaling, physical layer signaling, or the like, where the antenna port index and/or the number of antenna ports used by the DMRS #a are determined by the network device and notified to the terminal device. It should be noted that, the terminal device may report the maximum number of antenna ports or the maximum number of layers that the terminal device can support to the network device in advance, so that the network device can determine the number of antenna ports or the number of antenna ports that the terminal device can support.

Also, in S010, the receiving device (i.e., an example of the first receiving device, hereinafter, for convenience of understanding and explanation, referred to as a receiving device #a) of the DMRS #a may determine the antenna port #a, and the process of determining the antenna port #a by the receiving device #a may be similar to the process of determining the antenna port #a by the transmitting device #a, i.e., when the receiving device #a is a network device, the receiving device #a may determine the antenna port #a by itself; when the receiving device #a is a terminal device, the receiving device #a may determine the antenna port #a according to an instruction of a network device to which it is connected.

In S030, the transmitting device #a may determine a configuration pattern based on the antenna port #a, thereby determining a time-frequency resource (hereinafter, for convenience of understanding and explanation, referred to as a time-frequency resource #a) corresponding to the antenna port #a, mapping the DMRS #a onto the time-frequency resource #a, and transmitting the DMRS #a through the antenna port #a.

As described above, the system time-frequency resource (or the time-frequency resource included in the configuration pattern) may be divided into a plurality of basic time-frequency resource units (for example, one or more RBs or one or more REs), and the time-frequency resource #a may be located on all basic time-frequency resource units in the system time-frequency resource or may be located on a part of basic time-frequency resource units in the system time-frequency resource, for example, the time-frequency resource #a may be located on one or more RBs in the system time-frequency resource.

In addition, in the embodiment of the present application, all or part of the time-frequency resources (for example, all or part of REs) of the time-frequency resource #a bear other one or more DMRSs (for example, DMRS #b and/or DMRS #c described later) in addition to the DMRS #a, hereinafter, for convenience of understanding and distinguishing, a part or all of the time-frequency resources bearing at least two types of DMRSs on the time-frequency resource #a are described as: time-frequency resource #a1.

In this case, the dmrs#a and the other one or more DMRS may use, for example, a code division multiplexing method to multiplex the time-frequency resource #a1.

Thus, in the embodiment of the present application, the transmitting apparatus #a may determine a code resource (e.g., a code division multiplexing (code division multiplexing, CDM) code, hereinafter, for ease of understanding and distinction, referred to as code resource #a) corresponding to the DMRS #a. The "code resource corresponding to dmrs#a" may be understood as that dmrs#a is multiplexed on time-frequency resource #a1 based on the code resource #a.

As an example and not by way of limitation, in the embodiment of the present application, the maximum number of DMRS ports multiplexed on the same time-frequency resource may be determined based on the length of the code resource, for example, if the length of the code resource is 4, the maximum may support 4 DMRS multiplexing in the same time-frequency resource, and if the length of the code resource is 8, the maximum may support 8 DMRS multiplexing in the same time-frequency resource.

In addition, in the embodiment of the present application, the code resource corresponding to each DMRS may be determined by the network device (may be a transmitting device or a receiving device of the DMRS) and notified to the terminal device (may be a transmitting device or a receiving device of the DMRS). Alternatively, the code resource corresponding to each DMRS may be preset, and the code resource corresponding to each DMRS corresponds to the DMRS port index.

For another example, in the embodiment of the present application, the code resource corresponding to each type of DMRS may be specified by a communication system or a communication protocol, so that the code resource corresponding to the DMRS may be determined according to the type of the DMRS actually transmitted and/or the port index corresponding to the DMRS actually transmitted.

It should be understood that the above-listed method for determining the code resource is only exemplary, and the present application is not limited thereto, and the method for determining the code resource in the embodiments of the present application may be similar to the prior art, and detailed descriptions thereof are omitted here for avoiding redundancy.

The code resource #a is orthogonal to code resources (e.g., CDM codes) corresponding to other DMRSs (e.g., DMRS #b and/or DMRS #c described below) carried on the time-frequency resource #a1. Thus, the transmitting apparatus #a may further reuse the DMRS #a on the time-frequency resource #a1 based on the code resource #a.

Also, in S030, the receiving apparatus #a may determine a configuration pattern based on the antenna port #a, thereby determining a time-frequency resource #a corresponding to the antenna port #a, and receive the DMRS #a through the time-frequency resource #a, and a process of determining the time-frequency resource #a by the receiving apparatus #a may be similar to a process of determining the time-frequency resource #a by the transmitting apparatus #a, and here, detailed description thereof is omitted for avoiding redundancy.

In addition, the receiving device #a may determine the code resource #a and acquire the DMRS #a from the time-frequency resource #a1 based on the code resource #a, and the process of determining the code resource #a by the receiving device #a may be similar to the process of determining the code resource #a by the transmitting device #a, and detailed description thereof is omitted for avoiding redundancy.

If the code resource #a is used for the time-frequency resource #a1, the same code resource #a may be used for other time-frequency resources than the time-frequency resource #a1 in the time-frequency resource #a.

It should be understood that the sequences in this application may be used for DMRS, but also for other reference signals, such as CSI-RS, CRS, SRS, etc., which are not limited in this application.

The DMRS may occupy at least 1 OFDM symbol in the time domain, and the bandwidth occupied in the frequency domain is the same as the scheduling bandwidth of the scheduled data signal. The plurality of DMRS symbols corresponding to one port correspond to one DMRS base sequence, and one DMRS base sequence includes a plurality of DMRS base sequence elements. Taking the DMRS base sequence corresponding to the existing port as an example, the nth element in the DMRS base sequence may be generated by the following formula:

The DMRS base sequence r (n) generated based on the gold sequence may satisfy the following formula:

wherein c (n) is a pseudo-random sequence, and the generation formula is:

wherein N is _C ＝1600，x ₁ (n) can be initialized to x ₁ (0)＝1,x ₁ (n)＝0,n＝1,2,...,30，x ₂ The initialization of (n) satisfies:

c _init defined as the following form:

where l is the OFDM symbol index within one slot,

for a slot index within a system frame, < >>

N is the number of OFDM symbols in one time slot _ID ⁰ ,N _ID ¹ E {0,1,2,3,4,5,6, … … }, the values are integers, and can be configured by high-layer signaling. />

In connection with a cell Identification (ID), it may generally be equal to the cell ID. />

To initialize the parameters, the values may be 0 or 1. Lambda represents a CDM group (CDM group) index corresponding to the DMRS port.

In the embodiments of the present application, the OFDM symbol may also be simply referred to as a symbol, and the symbol hereinafter refers to an OFDM symbol if not specifically described.

And after the DMRS base sequence corresponding to one port is multiplied by the corresponding mask sequence, mapping the DMRS base sequence to the corresponding time-frequency resource through a preset time-frequency resource mapping rule. In the current NR protocol, a 2-class DMRS configuration mode is defined, including a Type 1DMRS and a Type 2DMRS.

Illustratively, for an existing port p, the mth element r (m) in the corresponding DMRS base sequence is mapped to an index (k, l) according to the following rule _p,μ Resource Element (RE). Wherein the index is (k, l) _p,μ The RE of (2) corresponds to an OFDM symbol with an index of l in a time slot in the time domain, corresponds to a subcarrier with an index of k in the frequency domain, and the mapping rule satisfies:

p is the index of the DMRS port,

is the symbol index of the starting OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w _f (k') is a frequency domain mask sequence element, w, corresponding to a subcarrier with index k _t And (l ') is a time domain mask sequence element corresponding to the OFDM symbol with index of l'. Mu represents a subcarrier spacing parameter, ">

For the power scaling factor, m=2n+k', Δ is the subcarrier offset factor.

In the present application, a reference signal sequence corresponding to a newly added port

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied: />

Wherein K is an integer from 0 to K-1, K is

The total number of subcarriers occupied in the frequency domain is 0 or 1, beta is a non-zero complex number, the number of elements included in the mask sequence w is I, I satisfies i=k mod (I/2) +l· (I/2) or i= (k mod (I/2)) ·2+l, r (k, l) is an element of the base sequence r mapped on the kth subcarrier and the first symbol, and the generating method of the base sequence r can be shown as formula (1). c (t) is a block sequence, t satisfying t=floor (k/(I/2)).

Wherein A mod B represents a modulo operation, which is used for representing the remainder obtained by dividing A by B, and can be also denoted as A% B or mod (A, B), and floor (A) represents a rounding-down operation on A, which is used for representing the maximum integer not greater than A.

Each element in the block sequence corresponds to a sequence block formed by a mask sequence with the length of I, as shown in formula (5), and each of consecutive I/2 subcarriers and I time-frequency resource elements corresponding to 2 OFDM symbols corresponds to one element in the block sequence. Or the mask sequence w (I) contains I elements, each corresponding to an element in the block sequence. For different sequence blocks, different elements in the sequence of blocks are corresponding. This ensures that the cross-correlation between long sequences of blocks of sequences is low, thereby reducing interference.

In the mapping rule of configuration Type 1 (Type 1 DMRS), w corresponding to the existing DMRS port p _f (k′)、w _t The values of (l') and Δ can be determined from table 1.

Table 1: type 1DMRS parameter values

It should be understood that table 1 is for illustration only and not limiting.

In a configuration Type 2 (Type 2 DMRS) mapping rule, w corresponding to an existing DMRS port p _f (k′)、w _t The values of (l') and Δ can be determined from Table 2.

Table 2: type 2DMRS parameter values

It is to be understood that table 2 is for illustration only and not for limitation.

Wherein λ is an index of CDM group to which the existing port p belongs, and time-frequency resources occupied by DMRS ports in the same CDM group are the same.

According to equation (4), the Type1 DMRS time-frequency resource mapping manner is shown in fig. 2 (a).

For single symbol DMRS (corresponding to l' =0), a maximum of 4 ports is supported, and the DMRS resource occupies one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups, wherein CDM group 0 includes port 0 and port 1; CDM group 1 contains port 2 and port 3.CDM group 0 and CDM group 1 are frequency division multiplexed (mapped on different frequency domain resources). DMRS ports contained within CDM group are mapped on the same time-frequency resource. The reference signal sequences corresponding to the DMRS ports contained in the CDM group are distinguished through the mask sequences, so that orthogonality of the DMRS ports in the CDM group is guaranteed, and interference among the DMRS transmitted on different antenna ports is further suppressed.

Specifically, port 0 and port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. I.e., a subcarrier spacing between adjacent frequency domain resources occupied by port 0 and port 1. For one DMRS port, 2 adjacent REs occupied correspond to one mask sequence of length 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 employ a set of mask sequences (+1+1 and +1-1) of length 2. Similarly, port 2 and port 3 are located within the same RE, and are mapped in comb-teeth fashion in the frequency domain on unoccupied REs for port 0 and port 1. For subcarrier 1 and subcarrier 3, port 2 and port 3 employ a set of mask sequences (+1+1 and +1-1) of length 2.

It should be understood that p in the table of the present application is a port index, a port with a port index of 1000 may be port 0 or port 0, a port with a port index of 1001 may be port 1 or port 1, … …, and a port with a port index of 100X may be port X or port X.

For a dual symbol DMRS (corresponding to l' =0 or 1), a maximum of 8 ports is supported, and the DMRS resource occupies two OFDM symbols. The 8 DMRS ports are divided into 2 CDM groups, where CDM group 0 includes port 0, port 1, port 4, and port 5; CDM group 1 contains port 2, port 3, port 6, and port 7.CDM group 0 and CDM group 1 are frequency division multiplexed. DMRS ports contained within CDM group are mapped on the same time-frequency resource. The reference signal sequences corresponding to DMRS ports contained in CDM group are distinguished by a mask sequence.

Specifically, port 0, port 1, port 4 and port 5 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain, that is, adjacent frequency domain resources occupied by port 0, port 1, port 4 and port 5 are separated by one subcarrier. For one DMRS port, 2 adjacent subcarriers and 2 OFDM symbols occupied correspond to a mask sequence of length 4. For example, for subcarrier 0 and subcarrier 2 corresponding to OFDM symbol 0 and OFDM symbol 1, port 0, port 1, port 4, and port 5 employ a set of mask sequences of length 4 (+1+1+1+1/+1+1-1/+1-1/+1+1-1/+1-1+1-1+1+1-1+1. Similarly, port 2, port 3, port 6 and port 7 are located within the same RE and are mapped in comb-teeth fashion in the frequency domain on the unoccupied subcarriers of port 0, port 1, port 4 and port 5. For subcarrier 1 and subcarrier 3 corresponding to OFDM symbol 0 and OFDM symbol 1, port 2, port 3, port 6, and port 7 employ a set of mask sequences of length 4 (+1+1+1+1/+1+1-1/+1-1+1/+1-1+1+1.

For the Type 2DMRS, the time-frequency resource mapping manner is shown in fig. 2 (b).

For single symbol DMRS, a maximum of 6 ports is supported, and the DMRS resource occupies one OFDM symbol. The 6 DMRS ports are divided into 3 CDM groups, where CDM group 0 includes port 0 and port 1; CDM group 1 contains port 2 and port 3; CDM group 2 contains port 4 and port 5. The CDM groups are frequency division multiplexed, and DMRS corresponding to the DMRS ports contained in the CDM groups are mapped on the same time-frequency resource. The reference signal sequences corresponding to DMRS ports contained in CDM group are distinguished by a mask sequence. For one DMRS port, the corresponding DMRS reference signal is mapped in a plurality of resource sub-blocks containing 2 continuous sub-carriers in the frequency domain, and 4 sub-carriers are separated between adjacent resource sub-blocks in the frequency domain.

Specifically, port 0 and port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking frequency domain resource granularity of 1RB as an example, port 0 and port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7.port 2 and port 3 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9.port 4 and port 5 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11. For 2DMRS ports contained within one CDM group, it corresponds to a masking sequence of length 2 (+1+1 and +1-1) within 2 adjacent subcarriers.

For a dual symbol DMRS, a maximum of 12 ports is supported, with DMRS resources occupying two OFDM symbols. The 12 DMRS ports are divided into 3 CDM groups, where CDM group 0 includes port 0, port 1, port 6, and port 7; CDM group 1 includes port 2, port 3, port 8, and port 9; CDM group 2 contains port 4, port 5, port 10, and port 11. The CDM groups are frequency division multiplexed, and DMRS corresponding to the DMRS ports contained in the CDM groups are mapped on the same time-frequency resource. The reference signal sequences corresponding to DMRS ports contained in CDM group are distinguished by a mask sequence. For one DMRS port, the corresponding DMRS reference signal is mapped in a plurality of resource sub-blocks containing 2 continuous sub-carriers in the frequency domain, and 4 sub-carriers are separated between adjacent resource sub-blocks in the frequency domain.

Specifically, port 0, port 1, port 6 and port 7 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking frequency domain resource granularity of 1RB as an example, port 0, port 1, port 6 and port 7 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 corresponding to OFDM symbol 0 and OFDM symbol 1. port 2, port 3, port 8 and port 9 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9 corresponding to OFDM symbol 1 and OFDM symbol 2. port 4, port 5, port 10 and port 11 occupy sub-carrier 4, sub-carrier 5, sub-carrier 10 and sub-carrier 11 corresponding to OFDM symbol 1 and OFDM symbol 2. For 4 DMRS ports included in one CDM group, it corresponds to a masking sequence of length 4 (+1+1+1+1/+1+1-1/+1-1+1+1-1/+1-1+1) in 2 adjacent subcarriers to which 2 OFDM symbols correspond.

Hereinafter, a method of DMRS transmission according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.

It should be understood that the mask sequence is taken as an example of the code for characterizing the orthogonality of the transmission data in the embodiment of the present application, and other applicable codes are also within the protection scope of the present application, which is not limited in this application.

In one embodiment of the present application, a transmitting end device transmits a reference signal (i.e., a first reference signal) of an existing port and a reference signal (i.e., a second reference signal) of an added port on the same resource, and a receiving end device receives the reference signal of the existing port and the reference signal of the added port on the same block of resource, and performs channel estimation according to a reference signal sequence corresponding to each reference signal.

For example, for Type 2DMRS,12 DMRS ports are divided into 3 CDM groups. For each DMRS port, the basic frequency domain granularity of its time-frequency resource map is 6 consecutive subcarriers. The consecutive 6 subcarriers and 2 OFDM symbols are divided into 3 time-frequency resource sub-blocks, each time-frequency resource sub-block containing consecutive 2 subcarriers and 2 OFDM symbols. The 3 time-frequency resource sub-blocks are frequency division multiplexed. As shown in fig. 3, reference signal sequences corresponding to 4 DMRS ports included in each CDM group are multiplied by a mask sequence with a length of 4 and then mapped to all REs included in the same resource sub-block. For example, for DMRS port 1, in the time-frequency resource block composed of 12 REs shown in fig. 3, 4 REs corresponding to 2 continuous subcarriers and 2 OFDM symbols are occupied, and a mask sequence with a corresponding length of 4 is +1, -1, +1, -1.

As wireless communication devices are deployed more densely in the future, the number of terminal devices further increases, and there is a higher demand for MIMO transport streams. In addition, with the continuous evolution of the subsequent massive (massive) MIMO system, the number of transceiving antennas will further increase (for example, the number of transmitting antennas of the network device supports 128T or 256T, the number of receiving antennas of the terminal 8R, T represents a transmitting port, and R represents a receiving port), so that the channel information acquisition will be more accurate, and a higher number of transmission streams can be further supported to improve the spectral efficiency of the MIMO system. This tends to require more DMRS ports to support higher transmission streams (greater than 12 streams), and thus, improvements in current DMRS port configurations are needed to support higher transmission streams.

In order to improve the number of transmission streams supported by a system, the embodiment of the application provides a communication method. The communication method may be performed by a terminal device and a network apparatus. Wherein the terminal device is, for example, the terminal device 101 shown in fig. 1, and the network device is, for example, the network device 102 shown in fig. 1. The communication method provided in the embodiment of the present application will be described below by taking a case where the terminal device is a UE and the network device is a base station as an example. It should be appreciated that the method may enable an increase in the number of transport streams by expanding the number of ports indicated by the RRC message for the indication of ports during the transmission of the reference signal. The reference signals include, but are not limited to, DMRS, and the description below mainly uses the reference signals as examples of DMRS, and DMRS may be replaced by other types of reference signals according to actual requirements.

As shown in fig. 5, the communication method provided in the embodiment of the present application may include the following steps:

s101: the base station transmits indication information (which may also be referred to as port indication information or reference signal port indication information in this application, etc.). The indication information may be used to indicate a port, where the port belongs to the first port set or the second port set.

The first port set corresponds to the N first time-frequency resource groups, and the second port set corresponds to the M second time-frequency resource groups. M and N are positive integers, and optionally, M is greater than N. Optionally, the time-frequency resources corresponding to the N first time-frequency resource groups are not coincident, for example, the time-domain positions and/or the frequency-domain positions of different time-frequency resources occupied by the same or different first time-frequency resource groups are not coincident. Similarly, the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped.

In the present application, the time-frequency resource group may be a set of multiple time-frequency resources, where the multiple time-frequency resources may occupy one or more symbols in a time domain and may occupy one or more subcarriers in a frequency domain. In the same time-frequency resource group, the number of symbols occupied by the time-frequency resources is the same and the number of occupied subcarriers is the same. Illustratively, the time-frequency resource group may correspond to one CDM group. For example, one first time-frequency resource group is one CDM group, and one second time-frequency resource group is one CDM group.

Optionally, in S101, the number of time-frequency resources occupied by the N first time-frequency resource groups is the same as the number of time-frequency resources occupied by the M second time-frequency resource groups. For example, taking the case that the time-frequency resources are REs, the N first time-frequency resource groups and the M second time-frequency resource groups may each include 12 REs. The number of REs occupied by each first time-frequency resource group may be the same or different, the number of REs occupied by each second time-frequency resource group may be the same or different, and the number of REs occupied by any one first time-frequency resource group and any one second time-frequency resource group may be the same or different.

In addition, the number of time-frequency resources occupied by the at least one first time-frequency resource group may be the same as the number of time-frequency resources occupied by the at least two second time-frequency resource groups. For example, taking the case that the time-frequency resources are REs, one first time-frequency resource group may occupy 6 REs, and correspondingly, the number of time-frequency resources occupied by two second time-frequency resource groups is 6, for example, one time-frequency resource group occupies 3 REs, and the other time-frequency resource group occupies another 3 REs.

Further optionally, the N first time-frequency resource groups and the M second time-frequency resource groups occupy the same OFDM symbol in the same slot. For example, the REs occupied by the N first time-frequency resource groups and the REs occupied by the M second time-frequency resource groups are located in the same OFDM symbol in the time domain.

Further optionally, among the M second time-frequency resource groups, at least one second time-frequency resource group is a subset of one of the N first time-frequency resource groups, e.g., the second time-frequency resource group is a proper subset of the first time-frequency resource group. For example, the REs in the at least one time-frequency resource group may constitute at least two second time-frequency resource groups, or the time-frequency resources (e.g., REs) occupied by the at least one first time-frequency resource group are the same as the time-frequency resources occupied by the at least two second time-frequency resource groups. Optionally, at least one first time-frequency resource group occupies the same time unit as at least two second time-frequency resource groups, where the time units are e.g. time slots and/or OFDM symbols in one time slot.

For example, in the case that two second time-frequency resource groups are formed by REs in one first time-frequency resource group, the two second time-frequency resource groups are proper subsets of the first time-frequency resource group. If the number of time-frequency resources occupied by the two second time-frequency resource groups is the same, the number of time-frequency resources occupied by the first time-frequency resource group is twice the number of time-frequency resources occupied by one of the second time-frequency resource groups. Alternatively, when two second time-frequency resource groups a and b are formed by REs in one first time-frequency resource group a and one second time-frequency resource group c is formed by REs in one first time-frequency resource group b, the second time-frequency resource groups a and b are proper subsets of the first time-frequency resource group a, and the second time-frequency resource group b may also be regarded as a subset of the first time-frequency resource group b.

In addition, among the M second time-frequency resource groups, subcarriers occupied by at least one second time-frequency resource group in one frequency domain unit are a subset of one first time-frequency resource group. For example, taking the frequency domain unit as RB as an example, one RB may include 12 subcarriers with indexes of 0, 1, 2 … … 11, respectively, and the subcarrier indexes occupied by one first time-frequency resource group are 0, 2, 4, 6 … … 10, respectively, and the subcarrier indexes occupied by one second time-frequency resource group may be 0, 4, and 8, and/or the subcarrier indexes occupied by one second time-frequency resource group may be 2, 6, and 10.

For example, taking the single symbol DMRS type 1 configuration shown by the number a in fig. 2 as an example, the first port set may be a set of

ports

0, 1, 2 and 3, and the N first time-frequency resources may correspond to CDM group 0 and CDM group 1 when the single symbol DMRS type 1 is adopted, i.e., n=2. Accordingly, the second port set may be a set of port 0, port 1, port 4, port 5, port 6, and port 7 shown by reference numeral a in fig. 6, and the M second time-frequency resources may correspond to CDM group 0, CDM group 2, and CDM group 3, i.e., m=3. Wherein CDM group 0 shown by reference number a in fig. 6 is identical to CDM group 0 in the single symbol DMRS type 1 configuration shown by reference number a in fig. 2, CDM group 2 shown by reference number a in fig. 6 includes REs of RE1, RE5 and RE9, ports corresponding to CDM group 3 are port 6 and port 7, and port 6 and port 7 correspond to different OCCs. CDM group 3 includes REs of RE3, RE7, and RE11, ports corresponding to CDM group 2 are port 4 and port 5, and port 4 and port 5 correspond to different OCCs.

Alternatively, the second port set may include port 4, port 5, port 6, port 7, port 8, port 9, port 10, and port 11 shown in fig. 6 by reference b, and the M second time-frequency resources may correspond to CDM group 2, CDM group 3, CDM group 4, and CDM group 5, i.e., m=4. Wherein CDM group 2 and CDM group 3 can be referred to the description of CDM group 2 and CDM group 3 shown by reference numeral a in fig. 6. CDM group 4 includes REs of RE0, RE4, and RE8, ports corresponding to CDM group 4 are port 8 and port 9, and port 8 and port 9 correspond to different OCCs. CDM group 5 includes REs of RE2, RE6, and RE10, ports corresponding to CDM group 5 are port 10 and port 11, and port 10 and port 11 correspond to different OCCs.

In S101, the indication information of the port may be used to indicate the port corresponding to the reference signal, taking the reference signal is DMRS as an example, where the indication information may be used to indicate the DMRS port, and for example, the indication information may include a port index.

After determining that the port corresponding to the reference signal belongs to the first port set or the second port set, the base station may send the indication information to the UE to indicate the port.

Correspondingly, the UE receives the indication information of the port.

S102: and the UE determines the port index corresponding to the reference signal according to the indication information.

The indication information of the port includes, but is not limited to, a port index.

The UE may further determine a second time-frequency resource group corresponding to the port index according to a correspondence between the indication information and the second time-frequency resource group. It should be appreciated that the correspondence may be stored in the UE, for example, by way of a pre-configuration or protocol definition; alternatively, the correspondence may be indicated to the UE by the base station or other network devices, which is not particularly limited in this application.

The UE may also transmit a reference signal according to the port index.

Based on the flow shown in fig. 5, for the number of time-frequency resources occupied by N first time-frequency resource groups, the UE is not limited to receiving or transmitting reference signals only through ports in the first port set, but also receiving or transmitting reference signals through ports in the second port set, where the time-frequency resources occupied by at least one second time-frequency resource group is a subset of the time-frequency resources occupied by one first time-frequency resource group, so that the second port set can support more time-frequency resource groups, and thus instruct the second port set to receive or transmit reference signals to implement port expansion. For example, when the base station determines that the first port set can meet the transmission stream number requirement, the base station instructs the UE to receive or transmit the reference signal through the ports in the first port set, and when the first port set cannot meet the transmission stream number requirement, the base station may instruct the ports in the second port set through the instruction information, so that the UE receives or transmits the reference signal through the ports in the second port set.

Improving system efficiency

In one possible implementation, the base station may indicate the first set of time-frequency resources and the corresponding first port set to the UE through configuration information. In addition, the UE may also determine the first time-frequency resource group by using a default configuration.

For example, when the first time-frequency resource group (or the first port set) is configured by the configuration information, the configuration information may be used to indicate the DMRS configuration type and/or the number of DMRS symbols corresponding to the first time-frequency resource group. For example, the configuration information may be used to indicate one of DMRS type 1 employing a single symbol, DMRS type 1 employing a double symbol, DMRS type 2 employing a single symbol, or DMRS type 2 employing a double symbol. The configuration information may specifically be indication information carried in an RRC message.

Alternatively, the first port set corresponds to 2 CDM groups (or the first port set corresponds to 2 first time-frequency resource groups), the second port set may correspond to 3 or 4 CDM groups (or the second port set corresponds to 3 or 4 second time-frequency resource groups, for example, the second port set may correspond to the second time-frequency resource groups shown in fig. 6 or 7). Or, the first port set corresponds to 3 CDM groups (or the first port set corresponds to 3 first time-frequency resource groups), the second port set corresponds to 4, 5, or 6 CDM groups (or the second port set corresponds to 4, 5, or 6 second time-frequency resource groups, for example, the second port set may correspond to the second time-frequency resource groups shown in fig. 8 or 9).

The following description will take one of DMRS type 1, dual-symbol DMRS type 1, single-symbol DMRS type 2, or dual-symbol DMRS type 2 as an example for the time-frequency resource of the first port set.

(1) The first port set corresponds to DMRS type 1 of single symbol

If the configuration information indicates DMRS type 1 employing a single symbol shown by a number a in fig. 2, the N first time-frequency resource groups may correspond to CDM group 0 and CDM group 1, and correspondingly, the M second time-frequency resource groups may correspond to CDM groups, such as CDM group 0, CDM group 2 and CDM group 3, in the pattern shown by a or b in fig. 6, see the foregoing description for details.

For example, fig. 6 illustrates two patterns obtained by performing port spreading based on the single symbol DMRS resource mapping pattern indicated by the number a in fig. 2, and distinguished by the numbers a and b in fig. 6, respectively, the second time-frequency resource group may correspond to CDM group 0, CDM group 2, and CDM group 3 in the number a, or to one of CDM groups 2 to 5 indicated by the number b, and the indication information of the port may indicate the port to which the second time-frequency resource group corresponds, for example, when the second time-frequency resource group corresponds to CDM group 2, the indication information may include

port index

4 or 5.

(2) The first port set corresponds to DMRS type 1 of dual symbol

If the configuration information indicates that the type 1 of the double symbol indicated by the number a in fig. 2 is adopted, N first time-frequency resource groups may correspond to CDM group 0 and CDM group 1, and correspondingly, M second time-frequency resource groups may correspond to CDM groups in the pattern indicated by the number a or the number b in fig. 7.

For example, fig. 7 shows two patterns obtained by performing port spreading based on the double symbol pattern indicated by the number a in fig. 2, which are distinguished by the numbers a and b in fig. 7, respectively, the second time-frequency resource group may correspond to CDM group 0, CDM group 2 or CDM group 3 in the number a, or include one of CDM groups 2 to 5 indicated by the number b, and the indication information of the ports may indicate the ports corresponding to the second time-frequency resource group, for example, when the second time-frequency resource group corresponds to CDM group 2, the indication information may include any one of the port indexes 12 to 15.

As shown in fig. 7 by numbers a and b, REs corresponding to CDM group 3 under the configuration of DMRS type 1 with double symbols are RE3, RE7 and RE11, ports corresponding to CDM group 3 are port 12, port 13, port 14 and port 15, ports 12, port 13, port 14 and port 15 correspond to different OCCs, REs included in CDM group 2 are RE1, RE5 and RE9, ports corresponding to CDM group 2 are port 8, port 9, port 10 and port 11, and ports 8, port 9, port 10 and port 11 correspond to different OCCs. As shown by a number b in fig. 7, the CDM group 5 includes REs RE2, RE6 and RE10, the CDM group 5 includes ports RE 20, port 21, port 22 and port 23, the ports 20, 21, 22 and 23 correspond to different OCCs, the CDM group 4 includes REs RE0, RE4 and RE8, the CDM group 4 includes ports RE 16, port 17, port 18 and port 19, and the ports 16, port 17, port 18 and port 19 correspond to different OCCs.

Alternatively, the base station may determine the second time-frequency resource group from CDM group 0, CDM group 2 and CDM group 3 shown by reference number a in fig. 7, and the port indication information may include an index of a port corresponding to the second time-frequency resource group, if it is determined that 5 to 6 stream transmission is required. Alternatively, the base station may determine the second time-frequency resource group from CDM groups 2 to 5 shown by reference number b in fig. 7 when determining that 7 to 8 stream transmission is required, and the indication information of the ports may include an index of a port corresponding to the second time-frequency resource group.

(3) The first port set corresponds to DMRS type 2 of single symbol

If the configuration information indicates DMRS type 2 employing a single symbol shown by a number b in fig. 2, N first time-frequency resource groups may correspond to CDM group 0, CMD group 1, and CDM group 2, and correspondingly, M second time-frequency resource groups may correspond to CDM groups in the pattern shown by a or b in fig. 8.

For example, fig. 8 shows three patterns obtained by port spreading based on the single symbol type 1 pattern shown by the number b in fig. 2, which are distinguished by the numbers a, b and c in fig. 8, respectively, the second time-frequency resource group may correspond to CDM group 0, CDM group 1, CDM group 3 or CDM group 4 in the number a, CDM group 0 shown by the number b, CDM groups 3 to CDM group 6, or one of CDM groups 3 to 8 shown by the number c, and the indication information of the ports may indicate the ports corresponding to the second time-frequency resource group, for example, when the second time-frequency resource group corresponds to CDM group 3, the indication information may include any one of the port indexes 8 to 9.

In the patterns indicated by numbers a, b and c in fig. 8, the CDM group 4 in the single symbol DMRS type 2 configuration includes REs of RE5, RE11, RE17 and RE23, the ports corresponding to the CDM group 4 are

ports

8 and 9, the REs included in the CDM group 3 are REs 4, RE10, RE16 and RE22, and the ports corresponding to the CDM group 3 are

ports

6 and 7. In the patterns shown by numbers b and c in fig. 8, CDM group 6 includes REs of RE3, RE9, RE15 (not shown in fig. 8) and RE21 (not shown in fig. 8), CDM group 6 corresponds to ports of port 12 and port 13, CDM group 5 includes REs of RE2, RE8, RE14 (not shown in fig. 8) and RE20 (not shown in fig. 8), and CDM group 5 corresponds to ports of port 10 and port 11. In the pattern indicated by reference numeral c in fig. 8, CDM group 8 includes REs of RE1, RE7, RE13 (not shown in fig. 8) and RE19 (not shown in fig. 8), CDM group 8 corresponds to ports of port 16 and port 17, CDM group 7 includes REs of RE0, RE6, RE12 (not shown in fig. 8) and RE18 (not shown in fig. 8), and CDM group 7 corresponds to ports of port 14 and port 15.

Alternatively, the base station may determine the second time-frequency resource group from CDM group 3 and CDM group 4 shown by reference number a in fig. 8, and the indication information of the ports may include an index of the port corresponding to the second time-frequency resource group, in the case where it is determined that 7 to 8 stream transmission is required. Alternatively, the base station may determine the second time-frequency resource group from CDM groups 3 to 6 shown by reference number b in fig. 8 in the case where it determines that 9 to 10 stream transmission is required, and the indication information of the ports may include an index of a port corresponding to the second time-frequency resource group. Alternatively, the base station may determine the second time-frequency resource group from CDM groups 3 to 8 shown by reference number c in fig. 8 in the case where it determines that 11 to 12 stream transmission is required, and the indication information of the ports may include an index of a port corresponding to the second time-frequency resource group.

(4) The first port set corresponds to DMRS type 2 of dual symbol

If the configuration information indicates DMRS type 2 employing the double symbol shown by the number b in fig. 2, the N first time-frequency resource groups may correspond to CDM group 0, CMD group 1 and CDM group 2, and correspondingly, the M second time-frequency resource groups may correspond to CDM groups in the pattern shown by the number a or the number b in fig. 9, for details, see the foregoing description.

For example, fig. 9 shows three patterns obtained by port spreading based on the double symbol type 2 pattern shown by the number b in fig. 2, which are distinguished by the numbers a, b and c in fig. 9, respectively, the second time-frequency resource group may correspond to at least one of CDM group 0, CDM group 1, CDM group 3 or CDM group 4 in the number a, or at least one of CDM group 0, CDM group 3 to CDM group 6 shown by the number b, or at least one of CDM group 3 to CDM group 8 shown by the number c, and the indication information of the port may indicate the port to which the second time-frequency resource group corresponds, for example, when the second time-frequency resource group corresponds to CDM group 3, the indication information may include any one of port indexes 16 to 19.

In the patterns shown by numbers a, b and c in fig. 9, CDM group 4 in the configuration of DMRS type 2 with double symbols may include REs of RE5 and RE11, ports corresponding to CDM group 4 are port 16, port 17, port 18 and port 19, REs included in CDM group 3 are RE4 and RE10, and ports corresponding to CDM group 3 are port 12, port 13, port 14 and port 15. In the patterns shown by numbers b and c in fig. 9, the REs included in CDM group 6 are RE3 and RE9, the ports corresponding to CDM group 6 are port 24, port 25, port 26 and port 27, the REs included in CDM group 5 are RE2 and RE8, and the ports corresponding to CDM group 5 are port 20, port 21, port 22 and port 23. In the pattern shown by reference number c in fig. 9, the REs included in CDM group 8 are RE1 and RE7, the ports corresponding to CDM group 8 are port 32, port 33, port 34 and port 35, the REs included in CDM group 7 are RE0 and RE6, and the ports corresponding to CDM group 7 are port 28, port 29, port 30 and port 31.

Alternatively, the base station may determine the second time-frequency resource group from CDM group 3 and CDM group 4 shown by reference number a in fig. 9 in the case where it is determined that 13 to 16 stream transmission is required, and the indication information of the ports may include an index of a port corresponding to the second time-frequency resource group. Alternatively, the base station may determine the second time-frequency resource group from CDM groups 3 to 6 shown by reference number b in fig. 9 in the case where it determines that 17 to 20 stream transmission is required, and the indication information of the ports may include an index of the port corresponding to the second time-frequency resource group. Alternatively, the base station may determine the second time-frequency resource group from CDM groups 3 to 8 shown by reference number c in fig. 9 in the case where it determines that 21 to 24 stream transmission is required, and the indication information of the ports may include an index of the port corresponding to the second time-frequency resource group.

Optionally, the ports in the second set of ports correspond to teeth 4 or teeth 6. In this application, comb n refers to dividing (e.g., equally dividing) Q subcarriers into n parts, where the subcarriers in each part correspond to the same port. For example, as shown by a pattern of a number b in fig. 6, REs 0 to RE11 correspond to CDM groups 2 to 5, that is, subcarriers are equally divided into 4 parts, and thus in the pattern of a number b in fig. 6, ports in the second port set correspond to comb teeth 4; as another example, as shown by a pattern of a number c in fig. 8, REs 0 to RE23 correspond to CDM groups 3 to 8, that is, subcarriers are equally divided into 6 parts, and thus ports in the second port set correspond to comb teeth 4 in the pattern of a number c in fig. 8.

In this application, the M second time-frequency resource groups may be obtained after splitting the N first time-frequency resource groups, and because the splitting may support more ports than the N first time-frequency resource groups, the splitting of the N first time-frequency resource groups to obtain the M second time-frequency resource groups may also be referred to as port expansion, or may be referred to as thinning the first time-frequency resource groups. Optionally, the time-frequency resources in the M second time-frequency resource groups are distributed at equal intervals, or at least one of the M second time-frequency resource groups may be obtained by equally dividing the first time-frequency resource group, or at least one second time-frequency resource group may be obtained according to the first time-frequency resource group in an equally-spaced dividing manner. Specifically, at least one first time-frequency resource group can be split at equal intervals, so as to obtain at least two second time-frequency resource groups.

If the first time-frequency resource group is DMRS type 1 of a single symbol shown by a number a in fig. 2, the second time-frequency resource group may correspond to a CDM group obtained by dividing the single symbol CDM group 0 or CDM group 1 shown by a number a in fig. 2. For example, the second time-frequency resource group may correspond to 3 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 6 streams) included in the pattern shown by reference numeral a in fig. 6, and the 3 CDM groups are CDM group 0, CDM group 2, and CDM group 3, respectively. Wherein CDM group 2 and CDM group 3 are split according to single symbol CDM group 1 shown by reference numeral a in fig. 2. CDM group 0, CDM group 2, and CDM group 3 frequency division multiplex DMRS resources. Alternatively, the base station may determine the second time-frequency resource group from CDM group 2 and CDM group 3 shown by reference number a in fig. 6 in the case where it is determined that 5 to 6 stream transmission is required, and the indication information of the ports may include an index of a port corresponding to the second time-frequency resource group.

Alternatively, the second time-frequency resource group may correspond to 4 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 8) included in the pattern shown by reference numeral b in fig. 6, and the 4 CDM groups are CDM group 2, CDM group 3, CDM group 4, and CDM group 5, respectively. Wherein CDM group 2 and CDM group 3 are split according to CDM group 1 under single symbol type 1 shown by number a in fig. 2, and CDM group 4 and CDM group 5 are split according to CDM group 0 under single symbol type 1 shown by number a in fig. 2. CDM group 2, CDM group 3, CDM group 4, and CDM group 5 frequency division multiplex DMRS resources. Alternatively, the base station may determine the second time-frequency resource group from CDM groups 2 to 5 shown by reference number b in fig. 6 when determining that 7 to 8 stream transmission is required, and the indication information of the ports may include an index of a port corresponding to the second time-frequency resource group.

If the first time-frequency resource group is the DMRS type 1 of the double symbol indicated by the number a in fig. 2, the second time-frequency resource group may be split corresponding to the double symbol CDM group 0 or CDM group 1 indicated by the number a in fig. 2.

For example, the second time-frequency resource group may correspond to 3 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 6) included in the pattern shown by reference numeral a in fig. 7, and the 3 CDM groups are CDM group 0, CDM group 2, and CDM group 3, respectively. Wherein CDM group 2 and CDM group 3 are split according to the double symbol CDM group 1 shown by reference numeral a in fig. 2. CDM group 0, CDM group 2, and CDM group 3 frequency division multiplex DMRS resources.

Alternatively, the second time-frequency resource group may correspond to 4 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 8) included in the pattern shown by reference numeral b in fig. 7, and the 4 CDM groups are CDM group 2, CDM group 3, CDM group 4, and CDM group 5, respectively. Wherein CDM group 2 and CDM group 3 are split according to the double symbol CDM group 1 shown by the number a in fig. 2, and CDM group 4 and CDM group 5 are split according to the double symbol CDM group 0 shown by the number a in fig. 2. CDM group 2, CDM group 3, CDM group 4, and CDM group 5 frequency division multiplex DMRS resources.

If the first time-frequency resource group is DMRS type 2 of a single symbol shown by a number b in fig. 2, the second time-frequency resource group may be other time-frequency resource groups than CDM group 0, CMD group 1, and CDM group 2 shown by a number b in fig. 2.

For example, the second time-frequency resource group corresponds to 4 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 8) in the pattern shown by reference numeral a in fig. 8, which are CDM group 0, CDM group 1, CDM group 3, and CDM group 4, respectively, wherein CDM group 3 and CDM group 4 are split according to CDM group 2 in the single symbol type 2 pattern shown by reference numeral b in fig. 2. CDM group 0, CDM group 1, CDM group 3, and CDM group 4 frequency division multiplex DMRS resources.

Alternatively, the second time-frequency resource group may correspond to 5 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 10) included in the pattern shown by reference numeral b in fig. 8, and the 5 CDM groups are CDM group 0, CDM group 3, CDM group 4, CDM group 5, and CDM group 6, respectively. Wherein

CDM groups

3, 4 are split according to CDM group 2 in the single symbol type 2 pattern shown by reference numeral b in fig. 2, and

CDM groups

5 and 6 are split according to CDM group 1 in the single symbol type 2 pattern shown by reference numeral b in fig. 2. CDM group 0, CDM group 3, CDM group 4, CDM group 5, and CDM group 6 frequency division multiplex DMRS resources.

Alternatively, the second time-frequency resource group may correspond to 6 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 12) included in the pattern shown in fig. 8, and the 6 CDM groups are CDM group 3, CDM group 4, CDM group 5, CDM group 6, CDM group 7, and CDM group 8, respectively, wherein CDM group 3, CDM group 4 are obtained by splitting CDM group 2 in the single symbol type 2 pattern shown in fig. 2 by reference number b, CDM group 5 and CDM group 6 are obtained by splitting CDM group 1 in the single symbol type 2 pattern shown in fig. 2 by reference number b, and CDM group 7 and CDM group 8 are obtained by splitting CDM group 0 in the single symbol type 2 pattern shown in fig. 2 by reference number b. CDM group 3, CDM group 4, CDM group 5, CDM group 6, CDM group 7, and CDM group 8 frequency division multiplex DMRS resources.

If the first time-frequency resource group is DMRS type 2 in the double symbol type 2 pattern shown by the number b in fig. 2, the second time-frequency resource group may correspond to other time-frequency resource groups than CDM group 0, CMD group 1, and CDM group 2 in the double symbol type 2 pattern shown by the number b in fig. 2.

For example, the second time-frequency resource group may correspond to 4 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 8) included in the pattern shown by reference numeral a in fig. 9, and the 4 CDM groups are CDM group 0, CDM group 1, CDM group 3, and CDM group 4, respectively. Wherein CDM group 3 and CDM group 4 are split according to CDM group 2 in a double symbol type 2 pattern shown by reference numeral b in fig. 2. CDM group 0, CDM group 1, CDM group 3, and CDM group 4 frequency division multiplex DMRS resources.

Alternatively, the second time-frequency resource group may correspond to 5 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 10) included in the pattern shown by reference numeral b in fig. 9, and the 5 CDM groups are CDM group 0, CDM group 3, CDM group 4, CDM group 5, and CDM group 6, respectively. Wherein

CDM groups

3, 4 are split according to CDM group 2 in the double symbol type 2 pattern shown by reference numeral b in fig. 2, and

CDM groups

5 and 6 are split according to CDM group 1 in the double symbol type 2 pattern shown by reference numeral b in fig. 2. CDM group 0, CDM group 3, CDM group 4, CDM group 5, and CDM group 6 frequency division multiplex DMRS resources.

Alternatively, the second time-frequency resource group may correspond to 6 CDM groups (each CDM group corresponds to two ports, i.e., the number of data streams supported by the pattern is 12) included in the pattern shown by reference numeral c in fig. 9, and the 6 CDM groups are CDM group 3, CDM group 4, CDM group 5, CDM group 6, CDM group 7, and CDM group 8, respectively. Wherein

CDM groups

3, 4 are split according to CDM group 2 in the double symbol type 2 pattern shown by reference number b in fig. 2,

CDM groups

5 and 6 are split according to CDM group 1 in the double symbol type 2 pattern shown by reference number b in fig. 2, and

CDM groups

7 and 8 are split according to CDM group 0 in the double symbol type 2 pattern shown by reference number b in fig. 2. CDM group 3, CDM group 4, CDM group 5, CDM group 6, CDM group 7, and CDM group 8 frequency division multiplex DMRS resources.

Optionally, when splitting the first time-frequency resource group corresponding to the first port set, the first time-frequency resource group with the larger corresponding reference index may be split preferentially. Here, splitting of the single symbol CDM group 0 and/or CDM group 1 shown by reference numeral a in fig. 2 is described as an example. Alternatively, the splitting may be performed starting from CDM group 0 and CDM group 1 corresponding to a larger port index, for example, splitting CDM group 1 before splitting single symbol CDM group 0 shown by reference numeral a in fig. 2 may obtain two CDM groups corresponding to the second time-frequency resource groups, and the CDM groups corresponding to CDM group 2 and CDM group 3, i.e., corresponding to the pattern in reference numeral a shown in fig. 6, respectively. When the requirement of the transmission stream number is still not satisfied by splitting CDM group 1, CDM group 0 may be split to obtain CDM groups corresponding to two time-frequency resource groups, and the CDM groups corresponding to CDM group 4 and CDM group 5, i.e., the patterns corresponding to the numbers b shown in fig. 6, respectively, are noted.

The following describes determining a mapping relationship between a reference signal sequence and a time-frequency resource in an embodiment of the present application.

In a possible implementation manner, it is assumed that the first port set in the embodiment of the present application corresponds to the first reference signal sequence

Said first reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

/>

where k is a positive integer greater than 0, l 'is 0 or 1, β is a non-zero complex number, w (k'), w (l ') is a frequency domain and time domain mask, respectively, and r (2n+k') is an element of the base sequence r mapped on the kth subcarrier and the first symbol.

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

Said second reference signal sequence +. >

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

n＝0，1，…

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1，2

n＝0，1，…

where k is a positive integer greater than 0, l 'is 0 or 1, β is a non-zero complex number, w (k'), w (l ') is a frequency domain and time domain mask, respectively, c is 1 or 2, indicating the comb splitting capability of the reference signal port, and r (2n+k') is an element of the base sequence r mapped on the kth subcarrier and the kth symbol.

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1or2

n＝0，1，…

A possible implementation of the communication method set forth in the present application is described below in connection with an embodiment.

Embodiment one:

when the configuration information indicates DMRS type 1 using a single symbol, the single symbol pattern indicated by the number a in fig. 2 may be split to obtain a pattern indicated by the number a in fig. 6. Wherein, if the base station indicates the port 4 or the port 5 through the indication information, the UE may determine that the second time-frequency resource group is CDM group 2 in the pattern indicated by the number a in fig. 6, and if the indication information of the port indicates the port 6 or the port 7, the UE may determine that the second time-frequency resource group in the pattern indicated by the number a in fig. 6 corresponds to CDM group 3. In addition, if the indication information of the port indicates port 0 or port 1, the UE may determine that the time-frequency resource group corresponding to the DMRS is CDM group 0 in the pattern indicated by reference number a in fig. 6. Therefore, using the pattern indicated by the number a in fig. 6, the maximum number of ports supported in the DMRS type 1 configuration of a single symbol can be extended from 4 to 6, and the maximum number of data streams supported can be extended from 4 to 6.

On the basis of splitting CDM group 1 to obtain the pattern shown by number a in fig. 6, if the requirement of the transmission stream number is still not satisfied, single symbol CDM group 0 shown by number a in fig. 2 may be further split to obtain the DMRS resource mapping pattern shown by number b in fig. 6. This configuration supports 4 CDM groups (each CDM group corresponds to two ports, i.e., the number of supported data streams is 8), CDM group 2, CDM group 3, CDM group 4, and CDM group 5, respectively. Wherein CDM group 2 and CDM group 3 can be referred to the description of number a in fig. 6. CDM group 4 includes REs of RE2, RE6, and RE10, ports corresponding to CDM group 4 are port 10 and port 11, and port 10 and port 11 correspond to different OCCs. CDM group 5 includes REs of RE0, RE4, and RE8, ports corresponding to CDM group 5 are port 8 and port 9, and port 8 and port 9 correspond to different OCCs.

According to the DMRS resource mapping pattern shown by reference number b in fig. 6, when the configuration information indicates DMRS type 1 employing a single symbol, the UE may determine that the second time-frequency resource group corresponds to CDM group 2 if the indication information of the port indicates port 4 or port 5, the UE may determine that the second time-frequency resource group corresponds to CDM group 3 if the indication information of the port indicates port 6 or port 7, the UE may determine that the second time-frequency resource group corresponds to CDM group 4 if the indication information of the port indicates port 10 or port 11, and the UE may determine that the second time-frequency resource group corresponds to CDM group 5 if the indication information of the port indicates port 8 or port 9. Therefore, using the pattern shown by the number b in fig. 6, the maximum number of ports supported in the DMRS type 1 configuration of a single symbol can be extended from 4 to 8, and the maximum number of data streams supported can be extended from 4 to 8.

Embodiment two:

if the configuration information indicates DMRS type 1 employing the double symbol indicated by the number a in fig. 2, the N first time-frequency resource groups may correspond to CDM group 0 and CDM group 1, and the second time-frequency resource groups may be time-frequency resource resources obtained by splitting CDM group 0 and/or CDM group 1. For example, as shown in a pattern b of fig. 7, REs occupied by a second time-frequency resource group are RE3, RE7, and RE11, and indication information of a port corresponding to the second time-frequency resource group may indicate a port 12, a port 13, a port 14, or a port 15. In addition, the REs occupied by another second time-frequency resource group are RE1, RE5 and RE9, and the indication information of the port corresponding to the second time-frequency resource group may indicate the port 8, the port 9, the port 10 or the port 11.

In case that the pattern indicated by the number a in fig. 7 still does not satisfy the requirement of the transport stream number, CDM group 0 may be further split to obtain the pattern indicated by the number b in fig. 7. In the pattern, REs occupied by a second time-frequency resource group obtained by splitting CDM group 0 are RE2, RE6 and RE10, and the indication information of the port corresponding to the second time-frequency resource group may indicate port 20, port 21, port 22 or port 23. The REs occupied by another second time-frequency resource group obtained by splitting CDM group 0 are RE0, RE4 and RE8, and the indication information of the port corresponding to the second time-frequency resource group may indicate port 16, port 17, port 18 or port 19.

Embodiment III:

as in the first and second embodiments, if the configuration information indicates that the single symbol type 2 pattern shown by the number b in fig. 2 is used, the N first time-frequency resource groups may correspond to CDM group 0, CMD group 1, and CDM group 2, and the m second time-frequency resource groups may be CDM groups in the pattern shown by the number a, b, or c in fig. 8.

Embodiment four:

in the same way as in the third embodiment, if the configuration information indicates that the dual symbol type 2 pattern shown by the number b in fig. 2 is adopted, the N first time-frequency resource groups may correspond to CDM group 0, CMD group 1, and CDM group 2, and the m second time-frequency resource groups may be CDM groups in the pattern shown by the number a, b, or c in fig. 9.

It should be understood that the pattern shown in fig. 2 and the patterns shown in fig. 6 to 9 obtained by splitting the pattern shown in fig. 2 are merely exemplary illustrations, and in practical applications, the resource mapping patterns corresponding to the DMRS types may have other forms, for example, if the RE numbers included in the CDM group under the configuration of each DMRS type are changed compared with fig. 2, the methods provided in the embodiments of the present application (and the patterns provided in the present application) may be adjusted accordingly, and are not further illustrated. By means of the DMRS port configuration mode provided by the embodiment, the network equipment can determine the time-frequency resources and the combing degree corresponding to the DMRS ports according to the number of the DMRS ports which are currently scheduled, the pairing flow number is improved, the system efficiency and the configuration flexibility are improved, the system throughput is improved, and the problem that the DMRS resources are limited in transmission is solved.

The uplink and downlink transmission processes of the reference signal in the communication method provided by the application are described below through embodiments.

As shown in fig. 10, taking the network device and the terminal device as an execution body as an example, the downlink transmission procedure of the reference signal may include the following steps:

s201: the network device determines a set of reference signal ports.

The reference signal port set includes a number of reference signal ports. Wherein the reference signal port set may comprise a first port set and a second port set as described herein. The network device may flexibly select to use the first port set or the second port set described in the present application according to the total reference signal port number currently scheduled.

In S201, the network device may further determine a sequence and a time-frequency resource mapping corresponding to ports in the reference signal port set.

The mapping manner between the possible sequences and the time-frequency resources is determined as follows:

reference signal port p corresponds to a reference signal sequence

Reference signal sequence->

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

c＝1，2

n＝0，1，…

wherein K is 0, 1, 2 … … K-1, K is

The total number of subcarriers occupied in the frequency domain is 0 or 1, beta is a power coefficient, generally a non-zero complex number, w (k '), w (1') is a frequency domain mask and a time domain mask, delta is a subcarrier offset corresponding to each time-frequency resource group, c is 1 or 2 (representing capacity expansion capacity coefficient), the specific values are shown in any one of tables 3 to 6, k 'is 2 or 6 (different values corresponding to different c), and r (2n+k') is an element of the base sequence r mapped on the kth subcarrier and the first symbol.

Another possible mapping between the sequence and the time-frequency resources is determined as follows:

reference signal port p corresponds to a reference signal sequence

Reference signal sequence->

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0.1

c＝1.2

n＝0，1，…

wherein K is 0, 1, 2 … … K-1, K is

The total number of subcarriers occupied in the frequency domain is 0 or 1, beta is a power coefficient, generally a non-zero complex number, w (k '), w (l ') is a frequency domain mask and a time domain mask, delta is a subcarrier offset corresponding to each time-frequency resource group, c is 1 or 2 (representing capacity expansion capacity coefficient), the specific values are shown in any one of tables 3 to 6, k ' is 2 or 6 (different values corresponding to different c), and r (n) is an element of the base sequence r mapped on the kth subcarrier and the 1 st symbol.

In tables 3 to 6, p=1000+ port index values. Wherein, table 3 corresponds to a pattern obtained by single symbol spreading of configuration type 1, as shown in fig. 6, and table 4 corresponds to a pattern obtained by double symbol spreading of configuration type 1, as shown in fig. 7. Table 5 corresponds to a pattern obtained by single symbol spreading for configuration type 2, as shown in fig. 8, and table 6 corresponds to a pattern obtained by double symbol spreading for configuration type 2, as shown in fig. 9.

TABLE 3 Table 3

TABLE 4 Table 4

TABLE 5

TABLE 6

reference signal port p corresponds to a reference signal sequence

Reference signal sequence->

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

/>

k′＝0，1

n＝0，1，…

wherein K is 0, 1, 2 … … K-1, K is

The total number of subcarriers occupied on the characteristic frequency domain is 0 or 1, beta is a power coefficient, the power coefficient is generally a non-zero complex number, w (k '), w (l ') is a frequency domain mask and a time domain mask respectively, delta is subcarrier offset corresponding to each time-frequency resource group, c is 1 or 2 (representing capacity expansion capacity coefficient), specific values are shown in any one of tables 7 to 10, k ' is 2 or 6 (different values corresponding to different c), and r (n) is an element of the base sequence r mapped on the kth subcarrier and the kth symbol.

reference signal port p corresponds to a reference signal sequence

Reference signal sequence->

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0，1

n＝0，1，…

wherein K is 0, 1, 2 … … K-1, K is

The total number of subcarriers occupied in the frequency domain is 0 or 1, beta is a power coefficient, generally a non-zero complex number, w (k '), w (l ') is a frequency domain mask and a time domain mask, delta is a subcarrier offset corresponding to each time-frequency resource group, c is 1 or 2 (representing capacity expansion capacity coefficient), the specific values are shown in any one of tables 7 to 10, k ' is 2 or 6 (different values corresponding to different c), and r (n) is an element of the base sequence r mapped on the kth subcarrier and the kth symbol.

In tables 7 to 10, p=1000+ port index values. Wherein, table 7 corresponds to a pattern obtained by single symbol spreading of configuration type 1, as shown in fig. 6, and table 8 corresponds to a pattern obtained by double symbol spreading of configuration type 1, as shown in fig. 7. Table 9 corresponds to a pattern obtained for configuration type 2 single symbol spreading, as shown in fig. 8, and table 10 corresponds to a pattern obtained for configuration type 2 double symbol spreading, as shown in fig. 9.

TABLE 7

TABLE 8

TABLE 9

/>

Table 10

The network device may further send the reference signal according to a sequence corresponding to the reference signal port and the time resource map.

S202: the network device transmits reference signal port indication information.

In a possible implementation, the network device may send port type indication information (for indicating configuration type 1 or configuration type 2) through higher layer signaling (e.g., RRC message), and the network device may send time domain symbol indication information (max length=1 or 2, that is, indicating single symbol or double symbol) occupied by the port through higher layer signaling (e.g., RRC message), so that one of the ports, configuration types, and symbol relationship configuration tables in tables 11 to 14 may be indicated. Correspondingly, the UE determines the field length and the corresponding interpretation of the antenna port indication information in the DCI according to the two information (i.e. determines which of the reference signal sequences corresponding to the ports corresponds to table 11 to table 14).

The network device may also send downlink control information (e.g., DCI) carrying port index indication information for indicating a certain set of port indices from the table (i.e., indicating values in the table) for the UE to determine ports, configuration types and symbols.

Exemplary tables 11 to 14 are for example:

TABLE 11 antenna port (denoted 1000+DMRS port), configuration type 1, single symbol (maxLength=1)

Table 12 antenna port (denoted 1000+dmrs port), configuration type 1, double symbol (maxlength=2)

/>

Table 13 antenna port (denoted 1000+dmrs port), configuration type 2, maxlength=1

/>

Table 14 antenna port (denoted 1000+dmrs port), configuration type 2, maxlength=2

/>

/>

S203: the terminal device receives the reference signal indication information.

The terminal device may determine, according to the reference signal indication information, the port corresponding to the reference signal and the time-frequency resource corresponding to the port from the port, the configuration type and the symbol relationship configuration table as shown in tables 11 to 14.

S204: the network device generates a reference signal sequence and transmits a reference signal.

The network device may determine a sequence and time-frequency resource mapping corresponding to the transmitted reference signal port according to the mapping manner between the sequence and time-frequency resource shown in S201, and transmit the reference signal according to the sequence and time-frequency resource mapping.

S205: the terminal equipment generates a reference signal sequence and receives a reference signal.

The terminal device may generate a corresponding reference signal sequence according to the port index received in S202, detect a reference signal on a corresponding time-frequency resource, and perform channel estimation to obtain a channel estimation result corresponding to the port.

The manner in which the terminal device generates the reference signal sequence may refer to the description of generating the corresponding sequence for the network device in S201, which is not described herein.

By means of the DMRS port configuration mode provided by the embodiment, the network equipment can determine the time-frequency resources and the combing degree corresponding to the DMRS ports according to the number of the DMRS ports which are currently scheduled, the downlink pairing flow number is improved, the system efficiency and the configuration flexibility are improved, the system throughput is improved, and the problem that the transmission of the DMRS resources is limited is solved.

As shown in fig. 11, the downlink transmission procedure of the reference signal may include the steps of:

s301: the network device determines a set of reference signal ports.

The reference signal port set may include a number of reference signal ports. Wherein the reference signal port set may comprise a first port set and a second port set as described herein. The network device may flexibly select to use the first port set or the second port set described in the present application according to the total reference signal port number currently scheduled.

In the process of S301, the network device may further determine a sequence and a time-frequency resource mapping corresponding to the ports in the set, which may be specifically referred to in S201, and is not specifically expanded herein.

S302: the network device transmits reference signal port indication information.

In a possible implementation, the network device may send port type indication information (for indicating configuration type 1 or configuration type 2) through higher layer signaling (such as RRC message); and, the network device transmits time domain symbol indication information (max length=1 or 2, that is, indicates single symbol or double symbol) occupied by the port through higher layer signaling (e.g., RRC message), wherein single symbol configuration type 1, double symbol configuration type 1, single symbol configuration type 2, and double symbol configuration type 2 correspond to the ports, configuration types, and symbol relationship configuration tables shown in tables 11 to 14, respectively. The UE determines the field length and the corresponding interpretation of the antenna port indication information in the DCI according to the two information (i.e. determines which of the tables 11 to 14 corresponds to the reference signal sequence corresponding to the port). Tables 11 to 14 can be referred to the description in S202.

The network device may also send downlink control information, which carries port index indication information for indicating a certain set of port indexes from the table.

S303: the terminal device receives the reference signal indication information.

S304: the terminal equipment generates a reference signal sequence and sends a reference signal.

The terminal device may generate a corresponding reference signal sequence according to the port index received in S202. The terminal device may further determine a sequence corresponding to the reference signal port and time-frequency resource mapping according to the mapping manner between the sequence and the time-frequency resource shown in S201, and transmit the reference signal according to the sequence and the time-frequency resource mapping. The manner in which the terminal device generates the reference signal sequence may refer to the description of generating the corresponding sequence for the network device in S201, which is not described herein.

S305: the network device generates a reference signal sequence and receives a reference signal.

The network device may determine the mapping of the sequence and the time-frequency resource corresponding to the transmitted reference signal port according to the mapping manner between the sequence and the time-frequency resource shown in S201, and detect the reference signal on the corresponding time-frequency resource, and perform channel estimation to obtain the channel estimation result corresponding to the port.

By means of the DMRS port configuration mode provided by the embodiment, the network equipment can determine the time-frequency resources and the combing degree corresponding to the DMRS ports according to the number of the DMRS ports which are currently scheduled, further configure the terminal equipment, and improve the uplink pairing flow number, so that the system efficiency and the configuration flexibility are improved, the system throughput is improved, and the problem that the DMRS resource transmission is limited is solved.

It should be understood that each table in the present invention represents various corresponding relationships, and is merely one possible implementation, and may be stored in a network device or terminal in a preconfigured or stored manner, and in different embodiments, the final configuration may be some rows in the foregoing embodiments. For each index identified as "reserved," other information may be indicated as needed for subsequent evolution or other technical schemes. The various formulas corresponding to the present invention are merely representations of one pattern.

Based on the same technical concept as the method embodiment, the embodiment of the application provides a communication device. The communication device may be configured as shown in fig. 12, and includes a processing module 1201 and a communication module 1202.

In one implementation manner, the communication apparatus may be specifically configured to implement a method performed by the terminal device or the network device in the embodiments of the present application, where the apparatus may be the network device itself, or may be a chip or a chipset/chip system or a part of a chip in the network device for performing a function of a related method.

When the action shown by the terminal device is implemented, the communication module 1202 may be configured to receive indication information, where the indication information is used to indicate that a port belongs to a first port set or a second port set, where the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group; the processing module 1201 may be configured to determine, according to the indication information, a port index corresponding to the reference signal.

When implementing the action shown by the network device, the processing module 1201 may be configured to determine indication information, where the indication information is used for a port belonging to a first port set or a second port set, where the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the number of the time-frequency resources occupied by the N first time-frequency resource groups and the M second time-frequency resource groups is the same; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group; the communication module 1202 may be configured to transmit the indication information.

The description and limitation of the meaning of the first port set, the second port set, the first time-frequency resource group, the second time-frequency resource group and the like can be referred to the corresponding description in the application, and the description is not repeated here.

It should be understood that the division of the modules in the embodiments of the present application is merely schematic, and there may be another division manner in actual implementation, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, or may exist separately and physically, or two or more modules may be integrated in one module. The integrated modules may be implemented in hardware, in software functional modules, or in a combination of hardware and software functional modules. It will be appreciated that the function or implementation of each module in the embodiments of the present application may further refer to the relevant description of the method embodiments.

In a possible manner, the communication apparatus may be a communication device or a chip in a communication device, where the communication device may be a network device or a terminal device, as shown in fig. 13. The apparatus may include a processor 1301, optionally the apparatus further includes a communication interface 1302, and optionally the apparatus further includes a memory 1303. The processing module 1201 may be the processor 1301. The communication module 1202 may be a communication interface 1302.

The processor 1301 may be a central processing unit (central processing unit, CPU), or a digital processing unit, or may be a processing circuit or logic circuit, etc. The communication interface 1302 may be a transceiver, or may be an interface circuit such as a transceiver circuit or the like, or may be a transceiver chip, or may be input and/or output pins or circuits on a chip or chipset/chip system, or the like. The apparatus further comprises: a memory 1303 for storing a program executed by the processor 1301. The memory 1303 may be a nonvolatile memory such as a Hard Disk Drive (HDD) or a Solid State Drive (SSD), or may be a volatile memory (RAM). Memory 1303 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

The processor 1301 is configured to execute the program code stored in the memory 1303, and specifically configured to execute the actions of the processing module 1201, which are not described herein. The communication interface 1302 is specifically configured to perform the actions of the communication module 1202 described above, which are not described herein.

The specific connection medium between the communication interface 1302, the processor 1301, and the memory 1303 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1303, the processor 1301 and the communication interface 1302 are connected through a bus 1304 in fig. 13, where the bus is indicated by a thick line in fig. 13, and the connection manner between other components is only schematically illustrated, but not limited to. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, bus 1304 is shown with only one bold line in FIG. 13, but does not represent only one bus or one type of bus.

The embodiment of the invention also provides a computer readable storage medium for storing computer software instructions required to be executed by the processor, and the computer readable storage medium contains a program required to be executed by the processor.

The embodiment of the invention also provides a computer program product which comprises a computer program for executing the processor.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of communication, comprising:

receiving indication information, wherein the indication information is used for indicating that a port belongs to a first port set or a second port set, the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group;

And determining the port index corresponding to the reference signal according to the indication information.

2. The method of claim 1, wherein the N first time-frequency resource groups occupy the same number of time-frequency resources as the M second time-frequency resource groups.

3. The method according to claim 1 or 2, wherein the at least one first set of time-frequency resources is identical to the time-frequency resources occupied by at least two second sets of time-frequency resources.

4. A method according to any of claims 1-3, characterized in that at least one first time-frequency resource group occupies twice the amount of time-frequency resources as one second time-frequency resource group.

5. The method according to any of claims 1-4, wherein the N first time-frequency resource groups occupy the same time unit as the M second time-frequency resource groups.

6. The method according to any of claims 1-5, wherein the subcarriers occupied by at least one second set of time-frequency resources in one frequency domain unit are a subset of one first set of time-frequency resources.

7. The method according to any of claims 1-6, wherein the time-frequency resources in the M second time-frequency resource groups are equally spaced.

8. The method of any of claims 1-7, wherein ports in the second set of ports correspond to comb teeth 4; alternatively, the ports in the second set of ports correspond to the comb teeth 6.

9. The method of any one of claims 1-8, wherein the first set of ports corresponds to 2 code division multiplexing, CDM, groups and the second set of ports corresponds to 3 or 4 CDM groups;

or, the first port set corresponds to 3 CDM groups, and the second port set corresponds to 4, 5, or 6 CDM groups.

10. The method of any one of claims 1-9, wherein the first set of ports corresponds to a first reference signal sequence

Said first reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

11. The method of any of claims 1-10, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +. >

Elements mapped on kth subcarrier and the ith symbol

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

12. The method of any of claims 1-10, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

13. The method of any of claims 1-10, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol

The following relationship is satisfied:

k′＝0,1

c＝1or2

n＝0,1,…

14. The method of any of claims 1-10, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol

The following relationship is satisfied:

k′＝0,1

c＝1 or 2

n＝0,1,…

15. A method of communication, comprising:

transmitting indication information, wherein the indication information is used for a port belonging to a first port set or a second port set, the first port set corresponds to N first time-frequency resource groups, and the second port set corresponds to M second time-frequency resource groups; the time-frequency resources corresponding to the N first time-frequency resource groups are not overlapped, and the time-frequency resources corresponding to the M second time-frequency resource groups are not overlapped; the number of the time-frequency resources occupied by the N first time-frequency resource groups and the M second time-frequency resource groups is the same; the time-frequency resources occupied by the at least one second time-frequency resource group are a subset of the time-frequency resources occupied by the one first time-frequency resource group.

16. The method of claim 15, wherein the N first time-frequency resource groups occupy the same number of time-frequency resources as the M second time-frequency resource groups.

17. The method according to claim 15 or 16, wherein the at least one first set of time-frequency resources is identical to the time-frequency resources occupied by at least two second sets of time-frequency resources.

18. The method according to any of claims 15-17, wherein at least one first time-frequency resource group occupies twice the amount of time-frequency resources as one second time-frequency resource group.

19. The method according to any of claims 15-18, wherein the N first time-frequency resource groups occupy the same time unit as the M second time-frequency resource groups.

20. The method according to any of claims 15-20, wherein the subcarriers occupied by at least one second set of time-frequency resources in one frequency domain unit are a subset of one first set of time-frequency resources.

21. The method according to any of claims 15-20, wherein the time-frequency resources in the M second time-frequency resource groups are equally spaced.

22. The method of any of claims 15-21, wherein ports in the second set of ports correspond to comb teeth 4; alternatively, the ports in the second set of ports correspond to the comb teeth 6.

23. The method of any one of claims 15-22, wherein the first set of ports corresponds to 2 CDM groups and the second set of ports corresponds to 3 or 4 CDM groups;

24. The method of any one of claims 15-23, wherein the first set of ports corresponds to a first reference signal sequence

Said first reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

25. The method of any of claims 16-23, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

26. The method of any of claims 15-23, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

n＝0,1,…

27. The method of any of claims 15-23, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +.>

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

c＝1,2

n＝0,1,…

28. The method of any of claims 15-23, wherein the second set of ports corresponds to a second reference signal sequence

Said second reference signal sequence +. >

Elements mapped on kth subcarrier and the ith symbol +.>

The following relationship is satisfied:

k′＝0,1

c＝1 or 2

n＝0,1,…

29. A communication device comprising a processor coupled to a memory for executing a computer program stored in the memory, such that the communication device performs the method of any of claims 1-14 or 15-28.

30. A computer readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1-14 or 15-28.