WO2023125697A1

WO2023125697A1 - Communication method and apparatus, and device

Info

Publication number: WO2023125697A1
Application number: PCT/CN2022/142942
Authority: WO
Inventors: 董昶钊; 李博; 高翔; 刘鹍鹏; 曲秉玉
Original assignee: 华为技术有限公司
Priority date: 2021-12-31
Filing date: 2022-12-28
Publication date: 2023-07-06
Also published as: CN116436579A

Abstract

Disclosed in the present application are a communication method and apparatus, and a device. The method comprises: a sending device may send indication information, the indication information being used for indicating that a port belongs to a first port set or a second port set, wherein the first port set corresponds to a first resource, the second port set corresponds to the first resource and a second resource, and the first resource and the second resource are located on a same time domain resource; if the sending device needs to send a first reference signal corresponding to the first port set, the sending device may send the first reference signal by means of the first resource; and if the sending device needs to send a second reference signal corresponding to the second port set, the sending device may send the second reference signal by means of the first resource and the second resource. By means of the method, more reference signal ports can be supported on limited resources, thereby supporting more transmission streams.

Description

A communication method, device and equipment

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202111673572.2 and the application title "a communication method, device and equipment" submitted to the China Patent Office on December 31, 2021, the entire contents of which are incorporated by reference in this application middle.

technical field

The present application relates to the technical field of communication, and in particular to a communication method, device and equipment.

Background technique

The demodulation reference signal (DMRS) can be used to estimate data channel (for example, physical downlink shared channel (physical downlink shared channel, PDSCH)) or control channel (for example, physical downlink control channel (physical downlink control channel, PDCCH) ) of the equivalent channel matrix, which is used for data detection and demodulation.

Generally speaking, a DMRS port (port) corresponds to a spatial layer, and each spatial layer corresponds to a transport stream. For multiple input and multiple output (MIMO) transmission in which the number of transmission streams is R, the number of DMRS ports required is R. Currently, the fifth generation (the 5 ^th , 5G) new radio (new radio, NR) supports two types of DMRS resource mapping, which are configuration type 1 (Type 1) DMRS and configuration type 2 (Type 2) DMRS. For single-symbol DMRS configuration, Type 1 DMRS can support up to 4 orthogonal DMRS ports, and Type 2 DMRS can support up to 6 orthogonal DMRS ports. Therefore, for single-symbol DMRS configuration, currently NR can only support MIMO transmission of 6 streams at most.

With the denser deployment of wireless communication devices in the future, the number of terminal devices will further increase, which puts forward higher requirements for the number of MIMO transmission streams. In addition, with the continuous evolution of the massive MIMO (Massive MIMO) system, the number of transmitting and receiving antennas will further increase (for example, the number of transmitting antennas of network equipment supports 128T or 256T, and the number of receiving antennas of terminals is 8R), and the acquisition of channel information will be more accurate , so that a higher number of transmission streams can be further supported to improve the spectrum efficiency of the MIMO system. This will inevitably require more DMRS ports to support a higher number of transmission streams (single symbol greater than 6 streams). Therefore, it is necessary to improve the current DMRS configuration method in order to support a higher number of transmission streams.

Contents of the invention

The present application provides a communication method, device and equipment for supporting more transmission streams.

In a first aspect, the embodiment of the present application provides a communication method. The method may be executed by a sending device, for example, the sending device may be a network device or a terminal device. The method includes:

The sending device may send indication information, where the indication information is used to indicate that the port belongs to the first port set or the second port set. Wherein, the first port set corresponds to the first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.

The same time domain resource may be the same time unit, for example, the same OFDM symbol, or the same two OFDM symbols.

Through this method, the sending device can send indication information for indicating whether the port belongs to the first port set or the second port set. When the port belongs to the first port set, that is, when the sending device needs to send the first reference signal corresponding to the first port set, the sending device can send the first reference signal through the first resource; when the port belongs to the second port set, that is, the sending device When it is necessary to send the second reference signal corresponding to the second port set, the sending device may send the second reference signal by using the first resource and the second resource. Through this method, more reference signal ports can be supported on limited resources, and thus more transmission streams can be supported.

In a possible design, the first port set corresponds to the first reference signal, and the second port set corresponds to the second reference signal; the number of first reference signal ports contained in the first port set is smaller than the second reference signal contained in the second port set Number of signal ports.

It should be understood that the first reference signal and the second reference signal may represent one or more reference signal symbols, the one or more reference signal symbols are mapped to one or more time-frequency resources, and the reference signal may correspond to one or more ports , which is not limited in this application. The first reference signal may correspond to an existing port, and the second reference signal may correspond to a newly added port.

With this design, the first resource can correspond to different port sets (for example, CDM groups hereinafter), and the two port sets corresponding to the first resource can support different numbers of reference signal ports. In this way, the reference signals corresponding to the two port sets can be mapped to part of the same time-frequency resources, thereby increasing the number of ports corresponding to the time-frequency resources, and further supporting more transmission streams.

In a possible design, the sending device may also acquire the first sequence and/or the second sequence. Wherein, the first sequence corresponds to the first resource, specifically, elements in the first sequence correspond to REs in the first resource one by one. The second sequence corresponds to the first resource and the second resource, specifically, elements in the second sequence correspond to REs in the first resource and the second resource one by one. Wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence.

In this way, when a port belongs to the first port set, that is, when the sending device needs to send the first reference signal corresponding to the first port set, the sending device can obtain the first sequence corresponding to the port, and map the first reference signal according to the first sequence to the first resource. When the port belongs to the second port set, that is, when the sending device needs to send the second reference signal corresponding to the second port set, the sending device can obtain the second sequence corresponding to the port, and map the second reference signal to the second sequence according to the second sequence. on the first resource and on the second resource.

Through this design, the first reference signal and the second reference signal carried by the first resource can be distinguished by the first sequence and the second sequence of different lengths; thus, more reference signal ports can be supported, and more The number of transport streams.

In a possible design, the first sequence belongs to a first sequence set, and sequences in the first sequence set are in one-to-one correspondence with at least one first reference signal. The second sequence belongs to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one-to-one.

Optionally, the average value of multiple values formed by the cross-correlation coefficients between any sequence in the first sequence set and any sequence in the second sequence set is less than or equal to a first threshold. For example, the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is less than or equal to the first threshold, that is, each sequence in the first sequence set and Each sequence in the second set of sequences has a low cross-correlation.

The relationship between the first sequence set and the second sequence set can be one of the following:

Relationship one:

Any sequence in the first sequence set is orthogonal to any sequence in the first subset in the second sequence set, and the cross-correlation coefficient with any sequence other than the first subset in the second sequence set is

Relationship two:

The cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is

Relationship three:

Relationship four:

Relationship five:

Relationship six:

Relationship Seven:

Optionally, on the basis of any of the above relationships, the multiple sequences included in the first sequence set are orthogonal to each other, and the multiple sequences included in the second sequence set are orthogonal to each other.

Optionally, the number of elements included in the sequence included in the first sequence set is 2, and the number of elements included in the sequence included in the second sequence set is 4 or 6.

Optionally, the first subset includes half of the sequences in the second sequence set. For example, when the second set of sequences includes 6 sequences, the first subset includes 3 sequences in the second set of sequences; or, when the second set of sequences includes 4 sequences, the first subset includes the second set of sequences 3 sequences in .

By this design, there is a low cross-correlation between the sequences included in the two sequence sets. The two sequence sets correspond to existing ports and newly added ports respectively. Therefore, there is a low cross-correlation between the DMRS signal corresponding to the existing port and the DMRS signal corresponding to any newly-added port, thereby ensuring the reusability of the existing port and the newly-added port, thereby ensuring that the DMRS signal corresponding to the existing DMRS port The interference between the DMRS signal and the DMRS signal corresponding to the newly added port is minimized.

In a possible design, the sequences in the second sequence set can be determined by one of the following methods:

Mode 1: When the number of elements in the second sequence set is 6, each sequence in the second sequence set is a row vector of the matrix b.

Mode 2: When the number of elements included in the sequences in the second sequence set is 4, each sequence in the second sequence set includes 4 elements in a row vector in the matrix b.

In mode 1 or mode 2, matrix b satisfies one of the following formulas:

Mode 3: When the number of elements included in the sequences in the second sequence set is 12, each sequence in the second sequence set is a row vector of the matrix B.

in,

or

or

In Mode 3, matrix b satisfies one of the following formulas:

This design provides an example of a variety of second sequence collections. Through this design, the sequences in the second sequence set can be flexibly obtained.

In a second aspect, the embodiment of the present application provides a communication method. The method can be executed by a receiving device, for example, the receiving device can be a network device or a terminal device. The method includes:

The receiving device receives the indication information; wherein, the indication information is used to indicate that the port belongs to the first port set or the second port set. Wherein, the first port set corresponds to the first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.

Through this method, the receiving device can determine whether the indicated port belongs to the first port set or the second port set according to the indication information. When the port belongs to the first port set, that is, when the receiving device needs to receive the first reference signal corresponding to the first port set, the receiving device can receive the first reference signal through the first resource; when the port belongs to the second port set, that is, the receiving device When it is necessary to receive the second reference signal corresponding to the second port set, the receiving device may receive the second reference signal through the first resource and the second resource. Through this method, more reference signal ports can be supported on limited resources, and thus more transmission streams can be supported.

In a possible design, the first sequence corresponds to the first resource, specifically, elements in the first sequence correspond to REs in the first resource one by one. The second sequence corresponds to the first resource and the second resource, specifically, elements in the second sequence correspond to REs in the first resource and the second resource one by one. Wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence.

With this design, the receiving device can receive the first reference signal corresponding to the first sequence through the first resource, receive the second reference signal corresponding to the second sequence through the first resource and the second resource, and the first resource and the second sequence The two resources are located on the same time domain resource. Wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence. In this way, the first reference signal and the second reference signal carried by the first resource can be distinguished by the first sequence and the second sequence of different lengths; thus, more reference signal ports can be supported, and more transmission streams can be supported number.

In a possible design, the first sequence belongs to a first sequence set, and sequences in the first sequence set are in one-to-one correspondence with at least one first reference signal. The second sequence belongs to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one-to-one. The relationship between the first sequence set and the second sequence set can be one of the following:

Relationship one:

Relationship two:

Relationship three:

Relationship four:

In mode 1 or mode 2, matrix b satisfies one of the following formulas:

In a third aspect, the embodiment of the present application provides a communication device, including a unit configured to perform each step in any one of the above aspects.

In a fourth aspect, the embodiment of the present application provides a communication device, including at least one processing element and at least one storage element, wherein the at least one storage element is used to store programs and data, and the at least one processing element is used to read and execute The program and data stored in the storage element enable the method provided by any one of the above aspects of the present application to be realized.

In a fifth aspect, an embodiment of the present application provides a communication system, including: a sending device configured to execute the method provided in the first aspect, and a receiving device configured to execute the method provided in the second aspect. Wherein, when the sending device is a network device, the receiving device may be a terminal device; when the sending device is a terminal device, the receiving device may be a network device.

In a sixth aspect, the embodiment of the present application further provides a computer program, which, when the computer program is run on a computer, causes the computer to execute the method provided in any one of the above aspects.

In the seventh aspect, the embodiment of the present application also provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a computer, the computer executes any one of the above-mentioned method provided.

In an eighth aspect, the embodiment of the present application further provides a chip, the chip is used to read a computer program stored in a memory, and execute the method provided in any one of the above aspects.

In a ninth aspect, the embodiment of the present application further provides a chip system, where the chip system includes a processor, configured to support a computer device to implement the method provided in any one of the above aspects. In a possible design, the chip system further includes a memory, and the memory is used to store necessary programs and data of the computer device. The system-on-a-chip may consist of chips, or may include chips and other discrete devices.

The technical effects that can be achieved by any one of the above-mentioned third to ninth aspects can be described with reference to the technical effects that can be achieved by any possible design of any one of the above-mentioned first or second aspects, and the repetition will not be discussed .

Description of drawings

FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a network device provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another network device provided by an embodiment of the present application;

Figure 4 is a schematic diagram of a single-symbol Type 1 DMRS time-frequency resource mapping method;

Figure 5 is a schematic diagram of a single symbol Type 2 DMRS time-frequency resource mapping method;

FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a first correspondence rule between a mask sequence element index and a time-frequency resource provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a first time-frequency resource mapping method provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of a second correspondence rule between a mask sequence element index and a time-frequency resource provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a second time-frequency resource mapping method provided in an embodiment of the present application;

FIG. 11 is a schematic diagram of a third correspondence rule between the mask sequence element index and the time-frequency resource provided by the embodiment of the present application;

FIG. 12 is a schematic diagram of a third time-frequency resource mapping method provided by an embodiment of the present application;

FIG. 13 is a schematic diagram of the fourth corresponding rule between the mask sequence element index and the time-frequency resource provided by the embodiment of the present application;

FIG. 14 is a schematic diagram of a fourth time-frequency resource mapping method provided by an embodiment of the present application;

FIG. 15 is a schematic diagram of the fifth corresponding rule between the mask sequence element index and the time-frequency resource provided by the embodiment of the present application;

FIG. 16 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 17 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

Detailed ways

The present application provides a communication method, device and equipment to support more transmission streams. Among them, the method and the device are conceived based on the same technology. Since the principle of solving the problem is similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

Through the solution provided by the embodiment of the present application, the sending device may send indication information, where the indication information is used to indicate that a port belongs to the first port set or the second port set. Wherein, the first port set corresponds to the first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource. When the sending device needs to send the first reference signal corresponding to the first port set, it can send the first reference signal through the first resource; when the sending device needs to send the second reference signal corresponding to the second port set, it can use the first resource and the second resource to send the second reference signal. Through this method, more reference signal ports can be supported on limited resources, and thus more transmission streams can be supported.

In the following, some terms used in the embodiments of the present application are explained, so as to facilitate the understanding of those skilled in the art.

1) A terminal device is a device that provides voice and/or data connectivity to users. Terminal equipment can also be called user equipment (user equipment, UE), terminal (terminal), access terminal, terminal unit, terminal station, mobile station (mobile station, MS), remote station, remote terminal, mobile terminal (mobile terminal) , MT), wireless communication equipment, customer premise equipment (CPE), terminal agent or terminal equipment, etc.

For example, the terminal device may be a handheld device with a wireless connection function, or a vehicle with a communication function, or a vehicle-mounted device (such as a vehicle-mounted communication device, a vehicle-mounted communication chip), and the like. At present, some examples of terminal equipment are: mobile phone, cordless phone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant , PDA) device, handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, tablet computer, computer with wireless transceiver function, notebook computer, palmtop computer, mobile Internet device (mobile internet device, MID ), wearable devices, virtual reality (virtual reality, VR) equipment, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in self driving, remote Wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, smart home in the wireless terminal, etc.

2) The network device is the device that connects the terminal device to the wireless network in the mobile communication system. As a node in a wireless access network, a network device can also be called a base station, a wireless access network (radio access network, RAN) node (or device), an access point (access point, AP), and an access network (access network). , AN) equipment.

Currently, examples of some network devices are: new generation Node B (generation Node B, gNB), transmission reception point (transmission reception point, TRP), evolved Node B (evolved Node B, eNB), wireless network controller (radio network controller (RNC), Node B (Node B, NB), base station controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, home base station (for example, home evolved NodeB, or home Node B, HNB), or base band unit (base band unit, BBU), etc.

3), time unit, generally refers to the unit of time. Exemplarily, the time unit may be, but not limited to, a subframe (subframe), a mini subframe, a slot (slot), a symbol, a transmission time interval (transmission time interval, TTI) and the like. Wherein, the symbol may be a time-domain symbol (for example, an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol) and the like.

4) Spatial layer: For a spatial multiplexing MIMO system, multiple parallel data streams can be transmitted simultaneously on the same frequency domain resource, and each data stream is called a spatial layer. The spatial layer in MIMO may also be called a transmission layer, a data layer, a spatial stream, and the like.

In the embodiments of the present application, for the number of nouns, unless otherwise specified, it means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three kinds of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship. For example, A/B means: A or B. "At least one (individual) of the following" or similar expressions refer to any combination of these items (individuals), including any combination of a single item (individuals) or a plurality of item (individuals).

In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used to distinguish the purpose of description, and should not be interpreted as indicating or implying relative importance, nor should they be understood as To indicate or imply an order.

The communication system applied in the embodiment of the present application will be described below with reference to the accompanying drawings.

Fig. 1 shows the structure of a mobile communication system to which the method provided by the embodiment of the present application is applicable. Referring to Figure 1, the system includes: network equipment and terminal equipment.

The network device is an entity capable of receiving and transmitting wireless signals on the network side, and is responsible for providing services related to wireless access for terminal devices within its coverage area, and realizing physical layer functions, resource scheduling and wireless resource management, and quality of service ( Quality of Service, QoS) management, wireless access control and mobility management functions.

The terminal device is an entity capable of receiving and transmitting wireless signals on the user side, and needs to access the network through the network device. The terminal device may be various devices that provide voice and/or data connectivity for users.

Wherein, the terminal device has multiple transmitting antennas and multiple receiving antennas, has multiple transmitting capabilities and multiple receiving capabilities, and can transmit signals through multiple transmitting channels and receive signals through multiple receiving channels.

The network device also has multiple transmitting antennas and multiple receiving antennas, and has multiple transmitting and multiple receiving capabilities. When the terminal device and the network device have multi-sending and multi-receiving capabilities, the system may also be called a MIMO system.

Exemplarily, the structure of the network device in the embodiment of the present application may be as shown in FIG. 2 . Specifically, the network device can be divided into a centralized unit (centralized unit, CU) node and at least one distributed unit (distributed unit, DU). Wherein, the CU can be used to manage or control at least one DU, and it can also be called that the CU is connected with the at least one DU. This structure can disassemble the protocol layers of the network equipment in the communication system. Some of the protocol layers are placed in the CU for centralized control, and the remaining part or all of the protocol layer functions are distributed in the DU, and the CU centrally controls the DU. Taking the network device as gNB as an example, the protocol layer of gNB includes radio resource control (radio resource control, RRC) layer, service data adaptation protocol (service data adaptation protocol, SDAP) layer, packet data convergence protocol (packet data convergence protocol, PDCP) layer, radio link control (radio link control, RLC) layer, media access control sublayer (media access control, MAC) layer and physical layer. Wherein, for example, the CU can be used to realize the functions of the RRC layer, the SDAP layer and the PDCP layer, and the DU can be used to realize the functions of the RLC layer, the MAC layer and the physical layer. The embodiment of the present application does not specifically limit the protocol stack included in the CU and DU.

Exemplarily, the CU in the embodiment of the present application can be further divided into one control plane (CU-control plane, CU-CP) network element and multiple user plane (CU-user plane, CU-UP) network elements. Among them, CU-CP can be used for control plane management, and CU-UP can be used for user plane data transmission. The interface between CU-CP and CU-UP can be E1 interface. The interface between the CU-CP and the DU may be F1-C, which is used for transmission of control plane signaling. The interface between CU-UP and DU may be F1-U, which is used for user plane data transmission. The CU-UP can be connected with the CU-UP through the Xn-U port for user plane data transmission. For example, taking gNB as an example, the structure of gNB may be as shown in FIG. 3 .

It should also be pointed out that the mobile communication system shown in FIG. 1 is used as an example, and does not limit the communication system to which the method provided in the embodiment of the present application is applicable. In short, the method and device provided by the embodiments of the present application are applicable to communication systems and application scenarios in which various terminal devices support multiple transmission capabilities, that is, the embodiments of the present application can also be applied to communication systems of various types and standards, for example, 5G Communication system, Long Term Evolution (LTE) communication system, NR, wireless-fidelity (Wireless-fidelity, WiFi), world interoperability for microwave access (WiMAX), vehicle to everything (vehicle to everything) everything, V2X), long-term evolution-vehicle networking (LTE-vehicle, LTE-V), vehicle to vehicle (vehicle to vehicle, V2V), vehicle networking, machine type communications (Machine Type Communications, MTC), Internet of Things (internet of things) things, IoT), long-term evolution-machine to machine (LTE-machine to machine, LTE-M), machine to machine (machine to machine, M2M), third generation partnership project (3rd generation partnership project, 3GPP) related Wireless communication, or other wireless communication that may appear in the future, etc., are not limited by this embodiment of the present application.

Currently, DMRS can be used to estimate the equivalent channel experienced by a data channel (such as PDSCH) or a control channel (such as PDCCH), or to estimate the equivalent channel matrix experienced by a data channel (such as PDSCH) or a control channel (such as PDCCH), so that For data detection and demodulation. The channel may produce certain weights or changes (for example, changes in amplitude, changes in phase, or changes in frequency, etc.) to the experienced signal. The channel can also be called a channel response, and the channel response can be represented by a channel response coefficient.

Assuming that the DMRS vector sent by the sender is s, and the transmitted data (or data symbol) vector is x, the DMRS and the data perform the same precoding operation (multiplied by the same precoding matrix P) and experience the same channel. In this way, after receiving the received signal corresponding to the data vector and the received signal corresponding to the DMRS vector, the receiving end can use a channel estimation algorithm to obtain an estimate of the equivalent channel based on the known DMRS vector s. Then, the receiving end can complete MIMO equalization and demodulation based on the equivalent channel.

Since DMRS is used to estimate the equivalent channel, its dimension is N _R ×R. Wherein, _NR is the number of receiving antennas, and R is the number of transmission streams (rank, that is, the number of data streams or the number of spatial layers). Generally speaking, one DMRS port (which may be simply referred to as a port in this application) corresponds to one spatial layer. Therefore, for MIMO transmission with the number of transmission streams R, the number of DMRS ports required is R.

In order to ensure the quality of channel estimation, usually different DMRS ports are orthogonal ports, so as to avoid interference between different DMRS ports. The fact that different DMRS ports are orthogonal ports means that DMRS symbols corresponding to different DMRS ports are orthogonal in the frequency domain, time-frequency domain or code domain. For a DMRS port, in order to perform channel estimation on different time-frequency resources and ensure channel estimation quality, it is necessary to transmit multiple DMRS symbols in multiple time-frequency resources. The DMRS can occupy at least one 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. Multiple DMRS symbols corresponding to one port correspond to one reference signal sequence, and one reference signal sequence includes multiple reference signal sequence elements.

The DMRS reference signal sequence corresponding to a port can be mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence through the preset time-frequency resource mapping rule.

For port p, the mth reference sequence element r(m) in its corresponding DMRS sequence can be mapped to a resource element (resource element, RE) with index (k,l) _p,μ according to the following rules. Among them, the RE with index (k, l) _{p, μ} can correspond to the OFDM symbol with index l in a time slot in the time domain, and correspond to the subcarrier with index k in the frequency domain, and the mapping rule satisfies:

k'=0,1;

n=0,1,...;

l'=0,1.

Among them, p is the index of the DMRS port, μ is the subcarrier spacing parameter,

is mapped to the DMRS modulation symbol corresponding to port p on RE with index (k, l) _{p, μ} ,

is the power scaling factor, w _t (l′) is the time-domain mask element corresponding to the OFDM symbol with index l’, w _f (k′) is the frequency-domain mask element corresponding to the subcarrier with index k’, m =2n+k', Δ is the subcarrier offset factor,

The symbol index of the start OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol. Among them, the value of m is related to the configuration type.

The following describes the resource mapping of Type 1 DMRS and Type 2 DMRS respectively.

For Type 1 DMRS:

In the Type 1 DMRS mapping rule, the values of w _f (k′), w _t (l′) and Δ corresponding to DMRS port p can be determined according to Table 1.

Table 1 Type 1 DMRS parameter values

Wherein, λ is an index of a code division multiplexing (CDM) group (also called an orthogonal multiplexing group) to which port p belongs, and DMRS ports in the same orthogonal multiplexing group occupy the same time-frequency resources.

According to formula (1), the time-frequency resource mapping method of Type 1 DMRS is shown in Figure 4.

For single-symbol DMRS (corresponding to 1'=0), a maximum of 4 ports are supported, and DMRS resources occupy one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups, among which CDM group 0 includes port 0 and port 1; CDM group 1 includes port 2 and port 3. CDM group 0 and CDM group 1 are frequency division multiplexed (mapped on different frequency domain resources). The DMRS ports included in the CDM group are mapped to the same time-frequency resource. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by the mask sequence, thereby ensuring the orthogonality of the DMRS ports in the CDM group, thereby suppressing interference between DMRSs transmitted on different antenna ports.

Specifically, port 0 and port 1 are located in the same resource element (RE), and resource mapping is performed in a comb-tooth manner in the frequency domain. That is, there is a subcarrier interval between adjacent frequency domain resources occupied by port 0 and port 1 . For a DMRS port, two adjacent occupied REs correspond to a mask sequence with a length of 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 use a set of mask sequences of length 2 (+1+1 and +1-1). Similarly, port 2 and port 3 are located in the same RE, and are mapped to unoccupied REs of port 0 and port 1 in a comb-tooth manner in the frequency domain. For subcarrier 1 and subcarrier 3, port 2 and port 3 use a set of mask sequences of length 2 (+1+1 and +1-1).

It should be understood that p in the application form 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, ..., a port with a port index of 100X Can be port X or port X.

For double-symbol DMRS (corresponding to l'=0 or 1), a maximum of 8 ports are supported, and DMRS resources occupy 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 includes port 2, port 3, port 6, and port 7. CDM group 0 and CDM group 1 are frequency division multiplexing. The DMRS ports included in the CDM group are mapped to the same time-frequency resource. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences.

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, the adjacent frequencies occupied by port 0, port 1, port 4, and port 5 Domain resources are separated by one subcarrier. For a DMRS port, the occupied 2 adjacent subcarriers and 2 OFDM symbols correspond to a mask sequence with a length of 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 use a set of mask sequences with a length of 4 (+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 in the same RE, and are mapped to unoccupied subcarriers of port 0, port 1, port 4, and port 5 in the frequency domain in a comb-tooth manner. For subcarrier 1 and subcarrier 3 corresponding to OFDM symbol 0 and OFDM symbol 1, port 2, port 3, port 6 and port 7 use a set of mask sequences of length 4 (+1+1+1+1/+1 +1-1-1/+1-1+1-1/+1-1-1+1).

For Type 2 DMRS:

The values of w _f (k′), w _t (l′) and Δ corresponding to DMRS port p in the Type 2 DMRS mapping rule can be determined according to Table 2.

Table 2 Type 2 DMRS port parameter values

Wherein, λ is an index of a CDM group (also called an orthogonal multiplexing group) to which port p belongs, and DMRS ports in the same CDM group occupy the same time-frequency resources.

According to formula (1), the Type 2 DMRS time-frequency resource mapping method is shown in Figure 5.

For single-symbol DMRS, a maximum of 6 ports are supported, and DMRS resources occupy 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 includes port 2 and port 3; CDM group 2 includes port 4 and port 5. Frequency division multiplexing is used between CDM groups, and DMRSs corresponding to DMRS ports included in a CDM group are mapped on the same time-frequency resource. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences. For a DMRS port, its corresponding DMRS reference signal is mapped in a plurality of resource sub-blocks containing 2 consecutive sub-carriers in the frequency domain, and adjacent resource sub-blocks are separated by 4 sub-carriers 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 as 1 RB 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 the 2 DMRS ports included in one CDM group, they correspond to mask sequences of length 2 (+1+1 and +1-1) in 2 adjacent subcarriers.

For two-symbol DMRS, a maximum of 12 ports are supported, and DMRS resources occupy 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 includes port 4 , Port 5, Port 10, and Port 11. Frequency division multiplexing is used between CDM groups, and DMRSs corresponding to DMRS ports included in a CDM group are mapped on the same time-frequency resource. The reference signal sequences corresponding to the DMRS ports included in the CDM group are distinguished by mask sequences. For a DMRS port, its corresponding DMRS reference signal is mapped in a plurality of resource subblocks containing 2 consecutive subcarriers in the frequency domain, and adjacent resource subblocks are separated by 4 subcarriers 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 as 1 RB 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 subcarrier 4, subcarrier 5, subcarrier 10, and subcarrier 11 corresponding to OFDM symbol 1 and OFDM symbol 2. For the 4 DMRS ports included in a CDM group, the corresponding length of 4 mask sequences (+1+1+1+1/+1+1- 1-1/+1-1+1-1/+1-1-1+1).

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

As mentioned above, at present, a single-symbol DMRS in NR can support up to 6 DMRS ports, thereby supporting up to 6 streams of MIMO transmission. With the deployment of more intensive wireless communication devices in the future and the further increase in the number of terminal devices, higher requirements are placed on the number of MIMO transmission streams. In addition, with the continuous evolution of the subsequent Massive MIMO system, the number of transmitting and receiving antennas will further increase (for example, the number of transmitting antennas of network equipment supports 128T or 256T, and the number of receiving antennas of terminals is 8R), and the channel information acquisition will be more accurate, which can further support higher The number of transmission streams to improve the spectral efficiency of MIMO systems. This will inevitably require more DMRS ports to support a higher number of transmission streams (greater than 6 streams).

Since different DMRS ports rely on frequency division multiplexing, time division multiplexing or code division multiplexing to achieve orthogonality, time-frequency resources and orthogonal codeword sets are limited.

A possible method for expanding the number of existing orthogonal DMRS ports is to increase the time-frequency resources occupied by the DMRS. This method can ensure that the number of resources occupied by the DMRS symbols corresponding to each DMRS port remains unchanged. However, as the number of ports increases, the number of resources required by the DMRS ports will also increase, and more time-frequency resources need to be occupied, increasing DMRS overhead. Moreover, the increase of DMRS overhead will also reduce the spectral efficiency of the system.

Another possible method is to multiplex DMRS symbols corresponding to more non-orthogonal DMRS ports while ensuring the same time-frequency resource (overhead). For example, a DMRS sequence with low cross-correlation corresponding to the newly added DMRS is designed. Wherein, the sequence corresponding to the newly added DMRS port and the sequence corresponding to the existing DMRS port ensure low cross-correlation. However, the superposition of non-orthogonal ports will inevitably bring some interference, resulting in loss of system performance (eg, channel estimation capability). Therefore, how to introduce a new DMRS port and reduce the impact on channel estimation performance without increasing additional time-frequency resource overhead is a problem to be solved.

The solutions provided by the present application will be described below in conjunction with the accompanying drawings.

An embodiment of the present application provides a communication method, which is applied to the communication system shown in FIG. 1 and executed by a network device or a terminal device. Referring to the flow chart shown in FIG. 6 , the flow of the method will be described in detail. Wherein, the sending device may be a network device, and the receiving device may be a terminal device; or the sending device may be a terminal device, and the receiving device may be a network device. The reference signal includes but is not limited to DMRS. In the following description, the reference signal is mainly DMRS as an example. The DMRS can be replaced by other types of reference signals according to actual needs.

As shown in Figure 6, the communication method provided by the embodiment of the present application may include the following steps:

S601: The sending device sends indication information; where the indication information may be used to indicate that a port (hereinafter referred to as a first port) belongs to a first port set or a second port set. Correspondingly, the receiving device receives the indication information.

Optionally, the indication information may be sent through a message (for example, an RRC message), or may be carried in control information (for example, uplink control information (uplink control information, UCI), or downlink control information (downlink control information, DCI)) middle.

Wherein, the first port set corresponds to the first resource, that is, the reference signals corresponding to the ports in the first port set can be mapped to the first resource. The second port set corresponds to the first resource and the second resource, that is, the reference signal corresponding to the port in the second port set can be mapped to the first resource and the second resource. Wherein, the first resource and the second resource may be located on the same time domain resource. The same time domain resource may be the same time unit, for example, the same symbol (such as an OFDM symbol), and the same two symbols.

Optionally, the first port set and the second port set are different CDM groups. For example, for single-symbol Type 1 DMRS, the first port set can be CDM group 0 or CDM group 1; for single-symbol Type 1 DMRS and single-symbol Type 2 DMRS, the first port set can be CDM group 0, CDM group 1 or CDM group 2. The second set of ports may be CDM group 3 . For single-symbol DMRS, CDM group 3 may include port 4 to port 7, or port 12 to port 17; for two-symbol DMRS, CDM group 3 may include port 8 to port 15, or port 12 to port 23.

S602: The sending device sends a reference signal corresponding to the first port on the time-frequency resource corresponding to the first port. Correspondingly, the receiving device sends the reference signal corresponding to the first port on the time-frequency resource corresponding to the first port.

Wherein, when the first port belongs to the first port set, the time-frequency resource corresponding to the first port is the first resource corresponding to the first port set. When the first port belongs to the second port set, the time-frequency resource corresponding to the first port is the first resource and the second resource corresponding to the second port set.

S602 will be described below by taking the single-symbol DMRS and the two-symbol DMRS as examples.

Single-symbol DMRS:

The first port set may include 2 ports, and the first resource may include 2 REs (for example, 2 subcarriers corresponding to one OFDM symbol). The second port set may include 4 ports, and the second resource may include 2 REs connected to the first resource (for example, 2 consecutive subcarriers corresponding to one OFDM symbol); or, the second port set may include 6 ports, The second resource may include 4 REs connected to the first resource (for example, 4 consecutive subcarriers corresponding to one OFDM symbol).

For example (hereinafter referred to as example one), for single symbol Type 1 DMRS, the first port set can include port 0 and port 1, the first resource includes RE0 and RE2; the second port set includes port 4 to port 7, and the second resource Includes RE1 and RE3. In this way, the reference signal corresponding to port 0 or the reference signal corresponding to port 1 can be mapped to RE0 and RE2, and the reference signal corresponding to any one of port 4 to port 7 can be mapped to RE0 to RE3.

For another example (hereinafter referred to as example two), for single symbol Type 2 DMRS, the first port set can include port 0 and port 1, and the first resource includes RE0 and RE1; the second port set includes port 12 to port 17, and the second port set includes port 0 and port 1. Resources include RE2 through RE5. In this way, the reference signal corresponding to port 0 or the reference signal corresponding to port 1 can be mapped to RE0 and RE1, and the reference signal corresponding to any one of port 12 to port 17 can be mapped to RE0 to RE5.

Two-symbol DMRS:

The first port set may include 4 ports, and the first resource may include 4 REs (for example, 2 subcarriers corresponding to 2 OFDM symbols). The second port set may include 8 ports, and the second resource may include 4 REs connected to the first resource (for example, 2 subcarriers corresponding to 2 OFDM symbols); or, the second port set may include 12 ports, The second resource may include 8 REs (eg, 4 consecutive subcarriers corresponding to 2 OFDM symbols) connected to the first resource.

For example, for two symbols Type 1 DMRS, the first port set can include port 0, port 1, port 4, port 5, the first resource includes RE0, RE2, RE12 and RE14; the second port set includes port 8 to port 15, The second resource includes RE1, RE3, RE13 and RE15. In this way, the reference signal corresponding to any port of port 0, port 1, port 4 and port 5 can be mapped to RE0, RE2, RE12 and RE14, and the reference signal corresponding to any port of port 8 to port 15 can be mapped to RE0 to RE3, and RE12 to RE15.

For another example, for two symbols Type 2 DMRS, the first port set may include port 0, port 1, port 6 and port 7, the first resource includes RE0, RE1, RE12 and RE13; the second port set includes port 12 to port 23 , the second resource includes RE2 to RE5, and RE14 to RE17. In this way, the reference signal corresponding to any port of port 0, port 1, port 6, and port 7 can be mapped to RE0, RE1, RE12, and RE13, and the reference signal corresponding to any port from port 12 to port 23 can be mapped to RE0 to RE5, and on RE12 to RE17.

Optionally, the sending device may generate the first reference signal according to the first sequence and the third sequence; generate the second reference signal according to the second sequence and the fourth sequence. Wherein the third sequence and the fourth sequence may respectively be base sequences of the reference signal. The base sequence of the reference signal may be a pseudo-random sequence, such as a gold sequence.

Through this method, when the sending device needs to send the first reference signal corresponding to the first port set, it can send the first reference signal through the first resource; when the sending device needs to send the second reference signal corresponding to the second port set, it can The second reference signal is sent through the first resource and the second resource. In this way, more reference signal ports can be supported on limited resources, and thus more transmission streams can be supported.

Optionally, in a possible implementation manner, the first port set corresponds to the first reference signal. Specifically, each port in the first port set corresponds to a first reference signal. The second port set corresponds to the second reference signal. Specifically, each port in the first port set corresponds to a second reference signal. The number of first reference signal ports included in the first port set is smaller than the number of second reference signal ports included in the second port set. That is to say, the number of ports included in the first port set is smaller than the number of ports included in the second port set. Both the first port set and the second port set correspond to the first resource, that is, the first resource can transmit reference signals corresponding to ports in the first port set and reference signals corresponding to ports in the second port set.

For example, in the first example of S602, the first port set may include port 0 and port 1, and the second port set may include port 4 to port 7.

For another example, in the second example of S602, the first port set may include port 0 and port 1, and the second port set may include port 12 to port 17.

Through this method, the first resource can correspond to different port sets (for example, CDM groups) at the same time, and the numbers of reference signal ports that can be supported by the two port sets corresponding to the first resource are different. In this way, the reference signals corresponding to the two port sets can be mapped to some of the same time-frequency resources, thereby increasing the number of ports corresponding to the time-frequency resources, and further supporting more transmission streams.

In some possible implementation manners, before S601, the method further includes:

S603: The sending device acquires the first sequence and/or the second sequence.

Wherein, the first sequence corresponds to the first resource, specifically, elements in the first sequence correspond to REs in the first resource one by one. The second sequence corresponds to the first resource and the second resource, specifically, elements in the second sequence correspond to REs in the first resource and the second resource one by one. Wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence.

The first sequence and the second sequence will be described respectively below.

For the first sequence:

Wherein, the first sequence may be a mask sequence, for example, an orthogonal mask sequence. The first sequence may belong to a first sequence set, and sequences in the first sequence set correspond to ports of the first reference signal (ie, ports in the first port set) in one-to-one correspondence.

In some possible implementation manners, the number of elements contained in each sequence in the first sequence set is 2, that is, the number of elements contained in each sequence in the first sequence set is 2. Wherein, the sequences in the first sequence set may be orthogonal to each other.

The correspondence between the sequences in the first sequence set and the ports of the first reference signal is illustrated below with an example.

For example, for single-symbol Type 1 DMRS or single-symbol Type 2 DMRS, the first sequence set may include: {+1,+1} and {+1,-1}, and the port of the first reference signal may be in CDM group 0 port 0 and port 1. Port 0 corresponds to the sequences {+1,+1} and {+1,-1}; port 1 corresponds to the sequence {+1,-1}.

For another example, for a single symbol Type 2 DMRS, the first sequence set may include: {+1,+1} and {+1,-1}, and the port of at least one first reference signal may be port 4 in CDM group 2 and port 5. Port 4 corresponds to the sequence {+1,+1}; port 5 corresponds to the sequence {+1,-1}.

In S603, the sending device may acquire the first sequence when the reference signal corresponding to the port in the first port set is to be sent. For example, when the sending device wants to send the transport stream, it may select the sequence corresponding to the DMRS port (that is, the first sequence) from the first sequence set according to the DMRS port corresponding to the transport stream.

In the present application, the first sequence set may be stipulated by the agreement, or may be determined in other ways, which is not limited in the present application.

In S602, the sending device may send the first reference signal corresponding to the first sequence through steps A1-A2 according to the first sequence. Correspondingly, the receiving device receives the first reference signal corresponding to the first sequence from the sending device.

A1: The sending device maps the first reference signal to the first resource according to the first sequence.

Wherein, the sending device may map the first reference signal corresponding to the first sequence to the corresponding time-frequency resource after multiplying the first sequence by the preset time-frequency resource mapping rule. The specific mapping method is as described above, and will not be repeated here.

For example (hereinafter referred to as Example 1), see Figure 4, for a single symbol Type 1 DMRS, the first sequence is {+1,+1}, {+1,+1} corresponds to port 0 in CDM group 0, and the first sequence A resource includes RE0 and RE2. The DMRS corresponding to port 0 is multiplied by {+1,+1} through a preset time-frequency resource mapping rule, and then mapped to RE0 and RE2.

Another example (hereinafter referred to as Example 2), see Figure 5, for the single symbol Type 2 DMRS, the first sequence is {+1,+1}, {+1,+1} corresponds to port 0 in CDM group 0, The first resource includes RE0 and RE1. After the DMRS corresponding to port 0 is multiplied by {+1,+1} through a preset time-frequency resource mapping rule, it is mapped to RE0 and RE1.

A2: The sending device sends the first reference signal by using the first resource. Correspondingly, the receiving device receives the first reference signal through the first resource.

When Example 1 is adopted, the sending device can send the DMRS corresponding to port 0 through RE0 and RE1.

When Example 2 is adopted, the sending device can send the DMRS corresponding to port 0 through RE0 and RE2.

For the second sequence:

Wherein, the second sequence may be a mask sequence, for example, an orthogonal mask sequence. The second sequence may belong to a second sequence set, and the sequences in the second sequence set are in one-to-one correspondence with the ports of the at least one second reference signal (ie, the ports in the second port set).

In some possible implementations, the number of elements contained in each sequence in the second sequence set is 4, 6, 8 or 12, that is, the number of elements contained in each sequence in the second sequence set is 4, 8, or 12. 6, 8 or 12 (also referred to as a sequence length of 4, 6, 8 or 12, or as 4 long sequences, 6 long sequences, 8 long sequences or 12 long sequences). Wherein, the sequences in the second sequence set may be orthogonal to each other. When the number of elements contained in each sequence in the second sequence set is 4, the second sequence set can contain 4 sequences; when the number of elements contained in each sequence in the second sequence set is 6, The second sequence set can contain 6 sequences; when the number of elements contained in each sequence in the second sequence set is 8, the second sequence set can contain 8 sequences; when each sequence in the second sequence set When the number of contained elements is 12, the second sequence set may contain 12 sequences.

Wherein, the second sequence set may be stipulated by the protocol, or may be determined in other ways (for example, the sending device is based on the formulas in Implementation Mode 1 to Implementation Mode 7 below (such as formula (2.A), formula (2. .B), formula (4.A) or formula (4.A)) generated), the application is not limited to this.

In this application, the relationship between the sequences in the first sequence set and the sequences in the second sequence set may include one of the following:

Relationship one:

Wherein, the first subset may include half of the sequences in the second sequence set. For example, when the second sequence set contains 6 sequences, the first subset contains 3 sequences in the second sequence set.

For the implementation manner of relationship 1, reference may be made to the implementation manner 1 below, which will not be repeated here.

Relationship two:

For the implementation of the second relationship, refer to the second implementation below, which will not be repeated here.

Relationship three:

Wherein, the first subset may include half of the sequences in the second sequence set. For example, when the second sequence set contains 4 sequences, the first subset contains 2 sequences in the second sequence set.

For the implementation of the third relationship, reference may be made to the third implementation below, which will not be repeated here.

Relationship four:

For the implementation of the fourth relationship, refer to the fourth implementation below, which will not be repeated here.

Relationship five:

Wherein, the first subset may include half of the sequences in the second sequence set. For example, when the second sequence set contains 12 sequences, the first subset contains 6 sequences in the second sequence set.

For the implementation of the fifth relationship, reference may be made to the fifth implementation below, which will not be repeated here.

Relationship six:

For the implementation manner of relationship six, refer to the implementation manner six below, which will not be repeated here.

Relationship Seven:

For the implementation manner of the relationship seven, reference may be made to the implementation manner VII below, which will not be repeated here.

In S602, the sending device may send the second reference signal through steps B1-B2 according to the second sequence. Correspondingly, the receiving device receives the second reference signal corresponding to the second sequence from the sending device.

B1: The sending device maps the second reference signal to the first resource and the second resource according to the second sequence.

In B1, the sending device may multiply the second reference signal corresponding to the second sequence by the second sequence and map it to the corresponding time-frequency resource according to the time-frequency resource mapping rule in one of the following implementations 1 to 7. superior. Wherein, a reference signal symbol of the second reference signal is mapped to each RE of the time-frequency resource block. The reference signal symbol is the product of the DMRS reference signal sequence element corresponding to the DMRS port in the RE and the corresponding sequence (eg, second sequence) element.

For example (hereinafter referred to as example 3), referring to FIG. 8, the second sequence includes 6 elements, the second sequence corresponds to port 12 in CDM group 3, the first resource includes RE0 and RE1, and the second resource includes RE2 to RE5. The DMRS corresponding to port 12 is mapped to RE0 to RE5 after being multiplied by the 6 elements of the second sequence by the time-frequency resource mapping rule in Implementation Mode 1 or Implementation Mode 2 below.

Another example (hereinafter referred to as Example 4), referring to FIG. 10, the second sequence includes 4 elements, the second sequence corresponds to port 4 in CDM group 3, the first resource includes RE0 and RE2, and the second resource includes RE1 and RE3 . The DMRS corresponding to port 4 is mapped to RE0 to RE4 after being multiplied by the 4 elements of the second sequence by the time-frequency resource mapping rule in Implementation Mode 3 or Implementation Mode 4 below.

Another example (hereinafter referred to as Example 5), referring to FIG. 12 , the second sequence includes 12 elements, the second sequence corresponds to port 12 in CDM group 3, the first resource includes RE0 and RE1, and the second resource includes RE2 to RE11 . The DMRS corresponding to port 12 is mapped to RE0 to RE11 after being multiplied by the 12 elements of the second sequence by the time-frequency resource mapping rule in Implementation Mode 5 or Implementation Mode 6 below.

B2: The sending device sends the second reference signal by using the first resource and the second resource. Correspondingly, the receiving device sends the second reference signal corresponding to the second sequence by using the first resource and the second resource.

When Example 3 is adopted, the sending device may send the DMRS corresponding to port 12 through RE0 to RE5.

When Example 4 is adopted, the sending device may send the DMRS corresponding to port 4 through RE0 to RE3.

When Example 4 is adopted, the sending device may send the DMRS corresponding to port 12 through RE0 to RE11.

In order to multiplex more DMRS ports in the same time-frequency resource, the embodiment of the present application designs a set of sequences with a length of 6 (that is, a second sequence set), and the second sequence set includes 6 orthogonal sequences (for example, Orthogonal mask sequence). Wherein, each orthogonal sequence includes 6 elements, and each sequence corresponds to a newly added DMRS port. That is to say, each orthogonal sequence can be used to map its corresponding newly added DMRS port to time-frequency resources. Therefore, six DMRS ports can be added.

Taking the second sequence set including the orthogonal mask sequence as an example, the sequence with a length of 6 proposed in the embodiment of the present application and its application will be described respectively through the implementation mode 1 and the implementation mode 2.

Implementation method one:

Each orthogonal mask sequence included in the second set of sequences may be a row vector of matrix b. Among them, the matrix b is:

or,

in,

Represents the Kronecker product; b is a 6*6 matrix, where each row vector corresponds to an orthogonal mask sequence of length 6. The matrix b corresponds to the second sequence set, where the 6 orthogonal mask sequences included in the second sequence set correspond to the 6 row vectors in the matrix b one by one. Any two mask sequences contained in the second sequence set are orthogonal to each other.

The DMRS mask sequences with a length of 6 generated according to formula (2.A) and formula (2.B) are shown in Table 3 and Table 4 respectively.

Table 3 length is 6 DMRS port mask sequences (corresponding formula 2.A)

As shown in Table 3, the 6 orthogonal mask sequences included in the second sequence set are:

Table 4 length is 6 DMRS port mask sequences (corresponding formula 2.B)

As shown in Table 4, the 6 orthogonal mask sequences included in the second sequence set are:

It should be understood that the tables in this application are only examples, and other forms of expression may also be used, which is not limited in this application. For example, the correspondence between the index and the element in the table can also be other correspondences, the correspondence between the sequence index in the table and the row vector corresponding to a row in the table can also be other correspondences, the correspondence between the sequence index in the table and the mask sequence The relationship can also be other corresponding relationships, and the elements listed in the table may be part or all.

In addition, in each embodiment of the present application, j in the table is an imaginary unit, and j ² =-1.

Table 3 or Table 4 includes 6 mask sequences of length 6. Wherein, each mask sequence with a length of 6 corresponds to a newly added DMRS port. Therefore, a total of 6 DMRS ports (which may be referred to as newly added ports in this application) can be added. An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 7 .

Specifically, a DMRS port corresponds to a mask sequence with a length of 6 in Table 3 or Table 4, and the corresponding rules between the elements contained in the mask sequence and the REs contained in the time-frequency resource block are shown in FIG. 7 . A mask sequence contains 6 elements, corresponding to the mask sequence element index 0 to index 5 in Table 3 or Table 4, and the number marked in each RE in Figure 7 indicates the index of the mask sequence element. Wherein, the mask sequence elements corresponding to the mask sequence element indexes 0 to 5 in Table 3 or Table 4 respectively correspond to the 6 subcarriers of the first OFDM symbol (for example, correspond to RE0 to RE5 respectively).

It should be understood that FIG. 7 is only an example and not a limitation. FIG. 7 may be a diagram of a part of REs or all REs, that is, RE0 to RE5 in the figure may represent any group of resource blocks, and symbol 0 may also be any other OFDM symbol, which is not limited in this application. For example, RE0 to RE5 may be subcarriers with indexes 6q+0˜6q+5 corresponding to one OFDM symbol, where q=0, 1, 2 . . . .

Combined with the existing NR Type 2 DMRS port time-frequency resource mapping rules shown in Figure 5 (refer to the ports corresponding to RE0 to RE5 in Figure 5), the newly added DMRS port and the existing NR Type 2 DMRS port are located between the above six REs The multiplexing relationship in the time-frequency resource block is shown in FIG. 8 . The existing NR Type 2 DMRS 6 ports are mapped according to the time-frequency resource mapping method of the existing protocol. One DMRS port corresponds to a mask sequence with a length of 2 and is mapped to two consecutive subcarriers. For the newly added 6 DMRS ports, corresponding to port indexes 12 to 17, different 6 long mask sequences are used to multiplex on all 6 REs.

Taking DMRS port 0 and DMRS port 12 as an example, DMRS port 0 adopts a mask sequence with a length of 2, which is mapped on subcarrier 0 and subcarrier 1 (ie, RE0 and RE1) corresponding to one OFDM symbol. The DMRS port 12 adopts a mask sequence with a length of 6, and is mapped on subcarrier 0 to subcarrier 5 (ie, RE1 to RE5 ) corresponding to one OFDM symbol.

In the new mask sequence of length 6 shown in Table 3 or Table 4, any two mask sequences are orthogonal, that is, the 6-length mask sequences corresponding to any two ports in the newly added ports are orthogonal . In addition, the mask sequence corresponding to any one of the existing Type 2 DMRS ports is orthogonal to 3 of the 6 new mask sequences shown in Table 3 or Table 4, and is orthogonal to the remaining The cross-correlation coefficient between any one of the three mask sequences is

Specifically, when the existing NR Type 2 DMRS ports are arranged in the time-frequency resource block composed of the above six REs according to the corresponding rules of the mask sequence element index and time-frequency resources shown in Figure 7, the existing NR Type 2 DMRS The mask sequence corresponding to the port can be expressed as:

Table 5 Existing NR Type 2 DMRS mask sequence

Taking the existing NR Type 2 DMRS port 0 as an example, according to the rules shown in Figure 7, the corresponding DMRS mask sequence extended to length 6 can be expressed as {+1,+1,0,0,0,0}. This sequence is orthogonal to the mask sequences whose sequence indexes are 0, 2, and 4 in Table 3 or Table 4, and the cross-correlation coefficient with the mask sequences whose sequence indexes are 1, 3, and 5 in Table 3 or Table 4 is

Therefore, for the mask sequence corresponding to the newly designed DMRS port, half of the sequence is orthogonal to the mask sequence corresponding to the existing DMRS port, and the other half maintains low cross-correlation characteristics for the mask sequence corresponding to the existing DMRS port , so that the quality of the channel estimation can be guaranteed to the greatest extent.

The method for mapping DMRSs to time-frequency resources according to the mask sequences shown in Table 3 or Table 4 based on the corresponding rules in FIG. 7 will be described below.

For port p among the newly added 6 DMRS ports, the mth reference sequence element r(m) in the corresponding reference signal sequence is mapped to the RE with index (k, l) _{p, μ} according to the following rules. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rule satisfies:

k=6n+k';

k'=0,1,2,3,4,5;

n=0,1,...;

l'=0,1.

For the mask sequence shown in Table 3, the values of w _f (k'), w _t (l') and Δ corresponding to DMRS port p in the mapping rule can be determined according to Table 6.

Table 6 newly added DMRS port parameter values (corresponding to Table 3)

For the mask sequence shown in Table 4, the values of w _f (k'), w _t (l') and Δ corresponding to DMRS port p in the mapping rule can be determined according to Table 7.

Table 7 newly added DMRS port parameter values (corresponding to Table 4)

This implementation method expands the port capacity of NR Type 2 single-symbol DMRS. In the same time-frequency resource block, the existing NR Type 2 single-symbol DMRS port and the newly added DMRS port use a mask sequence with a length of 2 and a mask sequence with a length of 6, respectively. By design, any two of the six length-6 mask sequences are orthogonal. Any one of the mask sequences with a length of 2 is orthogonal to half of the sequences in the set of mask sequences with a length of 6, and ensures extremely low cross-correlation with the remaining half of the sequences. Therefore, without increasing time-frequency resources, the DMRS ports with semi-orthogonal or low cross-correlation characteristics can be reused to double the capacity of DMRS ports, and the interference between the original port and the newly added port of the protocol can be minimized , to ensure the quality of channel estimation.

In addition, the newly designed mask sequence with a length of 6 takes into account the cross-correlation characteristics with the existing NR Type 2 orthogonal mask sequence with a length of 2. In practical applications, the semi-orthogonal and low cross-correlation features between the new sequence and the existing sequence can be fully utilized to allocate different DMRS ports to users in different situations. For example, orthogonal sequences can be allocated to users with greater interference, and non-orthogonal sequences with low cross-correlation can be allocated to users with less interference, so as to minimize the loss of channel estimation caused by non-orthogonal ports.

Implementation method two:

In the second implementation manner, each orthogonal mask sequence included in the second sequence set may be a row vector of the matrix b. Among them, the matrix b is:

or,

in,

Represents the Kronecker product; b is a 6*6 matrix, where each row vector corresponds to a mask sequence of length 6. The matrix b corresponds to the second sequence set, where the 6 orthogonal mask sequences included in the second sequence set correspond to the 6 row vectors in the matrix b one by one. Any two mask sequences contained in the second sequence set are orthogonal to each other.

The DMRS mask sequences with a length of 6 generated according to formula (4.A) and formula (4.B) are shown in Table 8 and Table 9 respectively.

Table 8 The mask sequence whose length is 6 (corresponding formula 4.A)

As shown in Table 8, the 6 orthogonal mask sequences included in the second sequence set are:

Table 9 The mask sequence whose length is 6 (corresponding formula 4.B)

As shown in Table 9, the 6 orthogonal mask sequences included in the second sequence set are:

In the mask sequences with a length of 6 shown in Table 8 or Table 9, each mask sequence corresponds to a DMRS port. Therefore, a total of 6 DMRS ports (which may be referred to as newly added ports in this application) are newly added. An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 7 .

Specifically, a DMRS port corresponds to a mask sequence with a length of 6 in Table 8 or Table 9, and the corresponding rules between the elements contained in the mask sequence and the REs contained in the time-frequency resource block are shown in FIG. 7 . A mask sequence contains 6 elements, corresponding to the mask sequence element index 0 to index 5 in Table 8 or Table 9, and the number marked in each RE in Figure 7 indicates the index of the mask sequence element. Wherein, the mask sequence elements corresponding to the mask sequence element indexes 0 to 5 in Table 8 or Table 9 respectively correspond to the 6 subcarriers of the first OFDM symbol (for example, correspond to RE0 to RE5 respectively). Combined with the existing NR Type 2 single-symbol DMRS port time-frequency resource mapping rules shown in Figure 5, the multiplexing of the newly added DMRS port and the existing NR Type 2 single-symbol DMRS port in the time-frequency resource blocks of the above six REs The relationship is shown in Figure 8. The 6 ports of the existing NR Type 2 DMRS single symbol are mapped according to the time-frequency resource mapping method of the existing protocol. One DMRS port corresponds to a mask sequence with a length of 2, and is mapped to two consecutive subcarriers. For the newly added 6 DMRS ports, corresponding to port indexes 12 to 17, different 6 long mask sequences are used to multiplex on all 6 REs.

Taking DMRS port 0 and DMRS port 12 as an example, DMRS port 0 adopts a mask sequence with a length of 2, which is mapped on subcarrier 0 and subcarrier 1 (ie, RE0 and RE1) corresponding to one OFDM symbol. The DMRS port 12 adopts a mask sequence with a length of 6, and is mapped on subcarrier 0 to subcarrier 5 (ie, RE1 to RE5) corresponding to one OFDM symbol.

Among the mask sequences with a length of 6 shown in Table 8 or Table 9, any two mask sequences are orthogonal, that is, the mask sequences with a length of 6 corresponding to any two ports in the newly added ports are orthogonal . In addition, the correlation coefficient between the mask sequence corresponding to any one of the existing Type 2 DMRS ports and any one of the six mask sequences shown in Table 8 or Table 9 is

Specifically, taking the existing NR Type 2 DMRS port 0 as an example, if the rules shown in Figure 7 are followed, the corresponding DMRS mask sequence extended to length 6 can be expressed as {+1,+1,0,0,0,0 }. The cross-correlation coefficient between this sequence and any mask sequence in Table 8 or Table 9 is

Therefore, the mask sequence corresponding to the newly designed DMRS port maintains an extremely low cross-correlation characteristic with respect to the mask sequence corresponding to the existing DMRS port, so that the quality of channel estimation can be guaranteed to the greatest extent.

The method for mapping DMRSs to time-frequency resources according to the mask sequences shown in Table 8 or Table 9 based on the corresponding rules in FIG. 7 will be described below.

k=6n+k';

k'=0,1,2,3,4,5;

n=0,1,...;

l'=0,1.

Corresponding to the mask sequence shown in Table 8, the value of w(k', l') corresponding to DMRS port p in the mapping rule can be determined according to Table 10.

Table 10 newly added DMRS port parameter values (corresponding to Table 8)

For the mask sequence shown in Table 9, the value of w(k', l') corresponding to DMRS port p in the mapping rule can be determined according to Table 11.

Table 11 newly added DMRS port parameter values (corresponding to Table 9)

This implementation method 2 expands the port capacity of NR Type 2 single-symbol DMRS. In the same time-frequency resource block, the existing NR Type 2 single-symbol DMRS port and the newly added DMRS port use a mask sequence with a length of 2 and a mask sequence with a length of 6, respectively. By design, any two of the six length-6 mask sequences are orthogonal. Any sequence in the mask sequence with a length of 2 and any sequence in the set of mask sequences with a length of 6 guarantee extremely low cross-correlation. In this way, non-orthogonal DMRS ports with low cross-correlation characteristics can be reused without increasing time-frequency resources to achieve double the expansion of DMRS ports, and minimize the interference between the original port and the newly added port of the protocol. Guarantees the quality of the channel estimate.

In order to multiplex more DMRS ports in the same time-frequency resource, the embodiment of the present application designs a set of sequences with a length of 4 (that is, a second sequence set), and the second sequence set includes 4 orthogonal sequences (for example, Orthogonal mask sequence). Wherein, each orthogonal sequence includes 4 elements, and each sequence corresponds to a newly added DMRS port. That is to say, each orthogonal sequence can be used to map its corresponding newly added DMRS port to time-frequency resources. Therefore, it is possible to add four DMRS ports.

Taking the second sequence set including the orthogonal mask sequence as an example, the sequence with a length of 4 proposed in the embodiment of the present application and its application will be described respectively through the third implementation and the fourth implementation.

Implementation method three:

Each orthogonal mask sequence included in the second set of sequences is related to matrix b. Among them, the matrix b is:

or,

in,

Represents the Kronecker product; b is a 6*6 matrix, where each row vector of the matrix b corresponds to a sequence of length 6.

The 4 orthogonal mask sequences included in the second sequence set are in one-to-one correspondence with the 4 row vectors in the matrix b. Each orthogonal mask sequence in the second sequence set contains 4 elements in the corresponding row vector. Wherein, the 4 row vectors may be any 4 row vectors among the 6 row vectors in the matrix b.

In addition, elements contained in different orthogonal mask sequences in the second sequence set correspond to the same column of the matrix b. For example, the second sequence set contains sequence 1 to sequence 4, respectively corresponding to the row vectors of rows 1 to 4 in matrix b, and sequence 1 to sequence 4 respectively contain the first 4 elements in the corresponding row in matrix b (for example, the table 12 or Table 13), or sequence 1 to sequence 4 respectively contain the last 4 elements in the corresponding row in matrix b, or sequence 1 to sequence 4 respectively contain the middle 4 elements in the corresponding row in matrix b, sequence 1 to sequence 4 contains the 1st, 3rd, 4th, and 5th elements in the corresponding row in matrix b, respectively.

The following uses the orthogonal mask sequence shown in Table 12 or Table 13 as an example to describe the present application. It should be understood that other DMRS mask sequences with a length of 4 generated according to (2.A) and formula (2.B) can also be implemented in a similar manner, which will not be repeated here.

Table 12 length is 4 DMRS port mask sequences (corresponding formula 2.A)

As shown in Table 12, the 4 orthogonal I code sequences contained in the second sequence set are respectively:

Table 13 length is 4 DMRS port mask sequences (corresponding formula 2.B)

As shown in Table 13, the four orthogonal mask sequences included in the second sequence set are:

As shown in Table 12 or Table 13, the second sequence set obtained through the implementation manner 3 may include 4 mask sequences with a length of 4. Wherein, each mask sequence with a length of 4 corresponds to a newly added DMRS port. Therefore, a total of 4 DMRS ports can be added (which may be referred to as newly added ports in this application). An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 9 .

Specifically, a DMRS port corresponds to a mask sequence with a length of 4 (for example, a mask sequence shown in Table 12 or Table 13), and the elements contained in the mask sequence correspond to the REs contained in the time-frequency resource block. The rules are shown in Figure 9. A mask sequence contains 4 elements, corresponding to the mask sequence element index 0 to index 3 in Table 12 or Table 13, and the number marked in each RE in Figure 9 indicates the index of the mask sequence element. Wherein, the mask sequence elements corresponding to the mask sequence element indexes 0 to 3 in Table 12 or Table 13 respectively correspond to the 4 subcarriers of the first OFDM symbol (for example, correspond to RE0 to RE3 respectively).

It should be understood that FIG. 9 is only an example and not a limitation. FIG. 9 may be a diagram of a part of REs or all REs, that is, RE0 to RE3 in the figure may represent any group of resource blocks, and symbol 0 may also be any other OFDM symbol, which is not limited in this application. For example, RE0 to RE3 may be subcarriers with indexes 4q+0˜4q+3 corresponding to one OFDM symbol, where q=0, 1, 2 . . . .

Combined with the existing NR Type 1 DMRS port time-frequency resource mapping rules shown in Figure 10, the multiplexing relationship between the newly added DMRS port and the existing NR Type 1 DMRS port in the time-frequency resource blocks of the above four REs is shown in Figure 10 shown. The existing 4 ports of NR Type 1 DMRS are mapped according to the time-frequency resource mapping method of the existing protocol. One DMRS port corresponds to a mask sequence of length 2, which is mapped to two consecutive subcarriers. For the newly added 4 DMRS ports, corresponding to port indexes 12-15, different 4 long mask sequences are used to multiplex on all 4 REs.

Taking DMRS port 0 and DMRS port 4 as an example, DMRS port 0 adopts a mask sequence of length 2, which is mapped on subcarrier 0 and subcarrier 2 (ie, RE0 and RE2) corresponding to one OFDM symbol. DMRS port 4 adopts a mask sequence with a length of 4, and is mapped on subcarrier 0 to subcarrier 3 (ie, RE1 to RE3) corresponding to one OFDM symbol.

In the new mask sequence of length 4 shown in Table 12 or Table 14, any two mask sequences are orthogonal, that is, the 4-length mask sequences corresponding to any two ports in the newly added ports are orthogonal . In addition, the mask sequence corresponding to any one of the existing Type 1 DMRS ports is orthogonal to two of the four new mask sequences shown in Table 12 or Table 13, and is orthogonal to the remaining The cross-correlation coefficient between any one of the two mask sequences is

Specifically, when the existing NR Type 1 DMRS ports are arranged in the time-frequency resource block composed of the above four REs according to the corresponding rules of the mask sequence element index and time-frequency resources shown in Figure 9, the existing NR Type 1 DMRS The mask sequence corresponding to the port can be expressed as:

Table 14 Existing NR Type 1 DMRS mask sequence

Taking the existing NR Type 1 DMRS port 0 as an example, according to the rules shown in Figure 9, the corresponding DMRS mask sequence extended to length 4 can be expressed as {+1,+1,0,0}. This sequence is orthogonal to the mask sequences whose sequence indexes are 0 and 2 in Table 12 or Table 13, and the cross-correlation coefficient with the mask sequences whose sequence indexes are 1 and 3 in Table 12 or Table 13 is

The method for mapping DMRSs to time-frequency resources according to the mask sequences shown in Table 12 or Table 13 based on the corresponding rules in FIG. 9 will be described below.

For port p among the newly added 4 DMRS ports, the mth reference sequence element r(m) in the corresponding reference signal sequence is mapped to the RE with index (k, l) _{p, μ} according to the following rules. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rule satisfies:

k=4n+2k';

k'=0,1,2,3;

n=0,1,...;

l'=0,1.

For the mask sequence shown in Table 12, the values of w _f (k'), w _t (l') and Δ corresponding to DMRS port p in the mapping rule can be determined according to Table 15.

Table 15 newly added DMRS port parameter values (corresponding to Table 12)

For the mask sequence shown in Table 13, the values of w _f (k'), w _t (l') and Δ corresponding to DMRS port p in the mapping rule can be determined according to Table 16.

Table 16 newly added DMRS port parameter values (corresponding to Table 13)

This implementation method expands the port capacity of NR Type 1 single-symbol DMRS. In the same time-frequency resource block, the existing NR Type 1 single-symbol DMRS port and the newly added DMRS port use a mask sequence with a length of 2 and a mask sequence with a length of 4, respectively. By design, any two of the four mask sequences of length 4 are orthogonal. Any sequence in the mask sequence with a length of 2 is orthogonal to a part of the sequence (for example, half of the sequences) in the set of mask sequences with a length of 4, and ensures extremely low cross-correlation with the remaining part of the sequence. Therefore, without increasing time-frequency resources, the DMRS ports with semi-orthogonal or low cross-correlation characteristics can be reused to double the capacity of DMRS ports, and the interference between the original port and the newly added port of the protocol can be minimized , to ensure the quality of channel estimation.

In addition, the newly designed mask sequence of length 4 takes into account the cross-correlation properties with the existing NR Type 1 orthogonal mask sequence of length 2. In practical applications, the semi-orthogonal and low cross-correlation features between the new sequence and the existing sequence can be fully utilized to allocate different DMRS ports to users in different situations. For example, orthogonal sequences can be allocated to users with greater interference, and non-orthogonal sequences with low cross-correlation can be allocated to users with less interference, so as to minimize the loss of channel estimation caused by non-orthogonal ports.

Implementation method four:

or,

in,

In addition, elements contained in different orthogonal mask sequences in the second sequence set correspond to the same column of the matrix b. For example, the second sequence set contains sequence 1 to sequence 4, respectively corresponding to the row vectors of rows 1 to 4 in matrix b, and sequence 1 to sequence 4 respectively contain the first 4 elements in the corresponding row in matrix b (for example, the table 17 or Table 18), or sequence 1 to sequence 4 respectively contain the last 4 elements in the corresponding row in matrix b, or sequence 1 to sequence 4 respectively contain the middle 4 elements in the corresponding row in matrix b, sequence 1 to sequence 4 contains the 1st, 3rd, 4th, and 5th elements in the corresponding row in matrix b, respectively.

The following uses the orthogonal mask sequence shown in Table 17 or Table 18 as an example to describe the present application. It should be understood that other DMRS mask sequences with a length of 4 generated according to (4.A) and formula (4.B) can also be implemented in a similar manner, which will not be repeated here.

Table 17 The mask sequence with a length of 4 (corresponding formula 4.A)

As shown in Table 17, the four orthogonal mask sequences included in the second sequence set are:

{1,-1,-j,-j},

{1,1,-j,j},

{1,-1,j,j},

{1,1,j,-j}.

Table 18 Mask sequence with a length of 4 (corresponding formula 4.B)

As shown in Table 18, the four orthogonal mask sequences included in the second sequence set are:

{1,-j,-j,-1},

{1,j,-j,1},

{1,-j,j,1},

{1,j,j,-1}.

As shown in Table 17 or Table 18, the second sequence set obtained through implementation manner 4 may include 4 mask sequences with a length of 4. Wherein, each mask sequence with a length of 4 corresponds to a DMRS port. Therefore, a total of 4 DMRS ports are newly added (which may be referred to as newly added ports in this application). An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 9 .

Specifically, a DMRS port corresponds to a mask sequence with a length of 4 (for example, a mask sequence shown in Table 17 or Table 18), and the elements contained in the mask sequence correspond to the REs contained in the time-frequency resource block The rules are shown in Figure 9. A mask sequence contains 4 elements, which respectively correspond to the mask sequence element index 0 to index 3 in Table 17 or Table 18. The number marked in each RE in Figure 9 indicates the index of the mask sequence element. Wherein, the mask sequence elements corresponding to the mask sequence element indexes 0 to 3 in Table 17 or Table 18 respectively correspond to the 4 subcarriers of the first OFDM symbol (for example, correspond to RE0 to RE3 respectively).

Combined with the existing NR Type 1 single-symbol DMRS port time-frequency resource mapping rules shown in Figure 4 (for example, the mapping rules between RE0 to RE4 and ports in Figure 4), the newly added DMRS port and the existing NR Type 1 single-symbol DMRS The multiplexing relationship of ports in the time-frequency resource blocks of the above four REs is shown in FIG. 10 . The four existing NR Type 1 DMRS single-symbol ports are mapped according to the time-frequency resource mapping method of the existing protocol. One DMRS port corresponds to a mask sequence of length 2, which is mapped to two consecutive subcarriers. For the newly added 4 DMRS ports, corresponding to port indexes 12 to 15, different 4 long mask sequences are used to multiplex on all 4 REs.

Taking DMRS port 0 and DMRS port 4 as an example, DMRS port 0 adopts a mask sequence of length 2, which is mapped on subcarrier 0 and subcarrier 2 (ie, RE0 and RE2) corresponding to one OFDM symbol. The DMRS port 4 adopts a mask sequence with a length of 4, and is mapped on subcarrier 0 to subcarrier 3 (ie, RE1 to RE3) corresponding to one OFDM symbol.

Among the mask sequences of length 4 shown in Table 17 or Table 18, any two mask sequences are orthogonal, that is, the mask sequences of length 4 corresponding to any two ports in the newly added ports are orthogonal . In addition, the correlation coefficient between the mask sequence corresponding to any one of the existing Type 1 DMRS ports and any one of the four mask sequences shown in Table 17 or Table 18 is

Specifically, taking the existing NR Type 1 DMRS port 0 as an example, if the rule shown in FIG. 9 is followed, the corresponding DMRS mask sequence extended to length 4 can be expressed as {+1,+1,0,0}. The cross-correlation coefficient between this sequence and any mask sequence in Table 17 or Table 18 is

Taking the mask sequence shown in Table 17 or Table 18 as an example, the method for mapping DMRS to time-frequency resources based on the corresponding rule in FIG. 9 is described below.

k=4n+2k';

k'=0,1,2,3;

n=0,1,...;

l'=0,1.

Corresponding to the mask sequence shown in Table 17, the value of w(k', l') corresponding to DMRS port p in the mapping rule can be determined according to Table 19.

Table 19 newly added DMRS port parameter values (corresponding to Table 17)

For the mask sequence shown in Table 18, the value of w(k', l') corresponding to DMRS port p in the mapping rule can be determined according to Table 20.

Table 20 newly added DMRS port parameter values (corresponding to Table 18)

This implementation method 4 expands the port capacity of NR Type 1 single-symbol DMRS. In the same time-frequency resource block, the existing NR Type 1 single-symbol DMRS port and the newly added DMRS port use a mask sequence with a length of 2 and a mask sequence with a length of 4, respectively. By design, any two of the four mask sequences of length 4 are orthogonal. Any sequence in the mask sequence with a length of 2 and any sequence in the set of mask sequences with a length of 4 guarantee extremely low cross-correlation. In this way, non-orthogonal DMRS ports with low cross-correlation characteristics can be reused without increasing time-frequency resources to achieve double the expansion of DMRS ports, and minimize the interference between the original port and the newly added port of the protocol. Guarantees the quality of the channel estimate.

In order to multiplex the same time-frequency resource for more DMRS ports, the present application designs a set of mask sequences (ie, the second sequence set) with a length of 12, wherein one mask sequence set includes 12 mask sequences. Each mask sequence contains 12 elements. Each mask sequence corresponds to a new DMRS port, so at least 12 new DMRS ports can be added.

Taking the second sequence set including the orthogonal mask sequence as an example, the sequence with a length of 12 proposed in the embodiment of the present application and its application will be described respectively through the fifth implementation and the sixth implementation.

Implementation method five:

The second sequence set may contain 12 mask sequences, and each mask sequence may contain 12 elements. Represent a mask sequence as a row vector, and a matrix of 12 mask sequences in the form of row vectors

The following relationship can be satisfied:

in

or,

or,

here

Represents the Kronecker product, B is a 12*12 matrix, where each row vector

(k=1,2,...,N, the value is a positive integer) corresponds to a mask sequence with a length of 12, and the length indicates the number of elements of the mask sequence. The matrix B corresponds to the second sequence set, wherein the 12 mask sequences included in the second sequence set correspond to the 12 row vectors in the matrix B one by one. Any two mask sequences contained in the second sequence set are orthogonal to each other. The DMRS mask sequences with a length of 12 generated according to formula (8.A), formula (8.B) and formula (8.C) are shown in Table 21, Table 22 and Table 23 respectively.

It should be understood that the tables in this application are only used as an example and not limiting. For example, the correspondence between the index and the element in the table can also be other correspondences, and the correspondence between the sequence index in the table and the row vector corresponding to a certain row in the table The relationship may also be other correspondences, and the correspondence between the sequence index and the mask sequence in the table may also be other correspondences, and the elements listed in the table may be part, may be all, and so on.

Table 21 mask sequence of length 12 (based on formula 8.A)

As shown in Table 21, the sequences in the second sequence set can be respectively:

Table 22 Mask sequence of length 12 (based on formula 8.B)

As shown in Table 22, the sequences in the second sequence set can be respectively:

As shown in Table 23, the sequences in the second sequence set can be: {1,j,1,j,1,j,1,j,1,j,1,j},

{1,-j,1,-j,1,-j,1,-j,1,-j,1,-j},

{1,j,1,j,1,j,-1,-j,-1,-j,-1,-j},

{1,-j,1,-j,1,-j,-1,j,-1,j,-1,j},

In the new mask sequences with a length of 12 shown in Table 21, Table 22 or Table 23, each mask sequence corresponds to a DMRS port, so a total of 12 DMRS ports are added (hereinafter referred to as newly added ports) . An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 11 .

Specifically, a DMRS port corresponds to a mask sequence with a length of 12 in Table 21, Table 22 or Table 23, and the corresponding rule of the mask sequence element index and the time-frequency resource RE is shown in FIG. 11 . A mask sequence includes 12 elements, corresponding to mask sequence element indexes 0 to 11, and the numbers marked in each RE in FIG. 11 indicate the index of the mask sequence element. Among them, the mask sequence elements corresponding to the mask sequence element indexes 0 to 5 in Table 21, Table 22 or Table 23 respectively correspond to the 6 subcarriers of the first OFDM symbol; the mask sequence element indexes in Table 21, Table 22 or Table 23 The mask sequence elements corresponding to 6-11 respectively correspond to the 6 subcarriers of the second OFDM symbol.

It should be understood that FIG. 11 is only an example and not a limitation. FIG. 11 may be a diagram of a part of REs or all REs, that is, subcarriers 0-5 in the figure may represent any group of resource blocks, and symbols 0-1 may also represent It is other 2 consecutive OFDM symbols, which is not limited in this application. For example, subcarriers 0~5 may be subcarriers with indexes 6q+0~6q+5, where q=0, 1, 2....

Combined with the existing NR Type 2 DMRS port time-frequency resource mapping rules shown in Figure 5, the multiplexing relationship between the newly added DMRS port and the existing NR Type 2 DMRS port in the time-frequency resource blocks of the above 12 REs is shown in Figure 12 shown. The 12 ports of the existing NR Type 2 DMRS are mapped according to the time-frequency resource mapping method of the existing protocol. One DMRS port corresponds to a mask sequence with a length of 4 and is mapped to two consecutive subcarriers. For the newly added 12 DMRS ports, corresponding to port indexes 12 to 23, different 12 long mask sequences are used to multiplex on all 12 REs.

Taking DMRS port 0 and DMRS port 12 as an example, DMRS port 0 adopts a mask sequence with a length of 4, and is mapped on subcarrier 0 and subcarrier 1 corresponding to two OFDM symbols. The DMRS port 12 uses a mask sequence with a length of 12, and is mapped on subcarriers 0 to 5 corresponding to two OFDM symbols. For example, taking Figure 11 as an example, the first element in the sequence corresponds to the RE with index 0, the second element corresponds to the RE with index 1, the third element corresponds to the RE with index 2, and so on.

Among the new mask sequences with a length of 12 shown in Table 21, Table 22 or Table 23, any two mask sequences are orthogonal, that is, the 12 long mask sequences corresponding to any two ports in the newly added ports are Orthogonal. In addition, the mask sequence corresponding to any one of the existing Type 2 DMRS ports is orthogonal to 6 of the 12 new mask sequences shown in Table 21, Table 22 or Table 23 , and the cross-correlation coefficient between any one of the remaining 6 mask sequences is

Specifically, the existing NR Type 2 DMRS ports are arranged in the time-frequency resource block composed of the above 12 REs according to the mask sequence element index and time-frequency resource correspondence rules shown in Figure 11, and the existing NR Type 2 DMRS ports correspond to The mask sequence of can be expressed as:

Table 24 Existing NR Type 2 DMRS mask sequence

For example, the existing NR Type 2 DMRS port 0, according to the rules shown in Figure 11, the corresponding DMRS mask sequence length extended to 12 can be expressed as {+1 +1 0 0 0 0 +1 +1 0 0 0 0} . This sequence is orthogonal to the new mask sequences with sequence indexes 6 to 11 in Table 21, Table 22 or Table 23, and is orthogonal to the new mask sequences with sequence indexes 0 to 5 in Table 21, Table 22 or Table 23. The correlation coefficient is

Taking the new mask sequence whose sequence index is 0 in Table 21 as an example, the cross-correlation coefficient between it and the DMRS mask sequence corresponding to the existing NR Type 2 DMRS port 0 is:

It should be understood that the threshold value of the cross-correlation coefficient here can be

Therefore, for the mask sequence corresponding to the newly designed DMRS port, half of the sequence is orthogonal to the mask sequence corresponding to the existing DMRS port, and the other half of the mask sequence corresponding to the existing DMRS port maintains low cross-correlation characteristics , so that the quality of the channel estimation can be guaranteed to the greatest extent.

Taking Figure 11 as an example, the mth element r(m) in the DMRS base sequence corresponding to port p among the newly added 12 DMRS ports is mapped to the RE with index (k,l) _p,μ according to the following rules . Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rule satisfies:

p is the index of the DMRS port,

is the symbol index of the start OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w _f (k′) is the frequency-domain mask sequence element corresponding to the subcarrier with index k’, w _t (l′) is the element of the time-domain mask sequence corresponding to the OFDM symbol whose index is l', and c(n) is the element mapped to the kth subcarrier and the lth symbol of the block sequence. μ represents the subcarrier spacing parameter,

is the power scaling factor, m=2n+k'.

Corresponding to the mask sequence shown in Table 21, the values of w _f (k') and w _t (l') corresponding to DMRS port p can be determined according to Table 25.

Table 25 new design length is 12 mask sequence corresponding mapping rules (corresponding table 21)

Corresponding to the mask sequence shown in Table 22, the values of w _f (k') and w _t (l') corresponding to DMRS port p can be determined according to Table 26.

Table 26 new design length is 12 mask sequence corresponding mapping rules (corresponding table 22)

Corresponding to the mask sequence shown in Table 23, the values of w _f (k') and w _t (l') corresponding to DMRS port p can be determined according to Table 27.

Table 27 new design length is 12 mask sequence corresponding mapping rules (corresponding table 23)

The value of block sequence element c(n) can satisfy the following relationship:

Wherein, N is twice the number of RBs included in the bandwidth occupied by the DMRS signal in the frequency domain, and v may be a number that is relatively prime to N.

In the embodiment of the present application, the port of NR Type 2 DMRS is expanded. In the same time-frequency resource block, the existing NR Type 2 DMRS port and the newly added DMRS port adopt a mask sequence with a length of 4 and a mask sequence with a length of 12 respectively. mask sequence. By design, any two of the 12 length-12 mask sequences are orthogonal. Any one of the mask sequences with a length of 4 is orthogonal to half of the sequences in the set of mask sequences with a length of 12, and guarantees low cross-correlation with the remaining half of the sequences. Therefore, the expansion of the DMRS port can be doubled without increasing the time-frequency resources, and the interference between the original port and the newly added port of the protocol can be reduced to the greatest extent, so as to ensure the quality of channel estimation.

Implementation method six:

A matrix of masked sequences contained in the second sequence set in the form of row vectors

The following relationship can be satisfied:

or,

here

Represents the Kronecker product, B is a 12*12 matrix, where each row vector

(k=1,2,...,N, the value is a positive integer) corresponds to a mask sequence with a length of 12. Any two mask sequences contained in the mask sequence set B are orthogonal to each other. The DMRS mask sequences with a length of 12 generated according to formula (11.A) and formula (11.B) are shown in Table 28 and Table 29 respectively.

Table 28 mask sequence of length 12 (based on formula 11.A)

As shown in Table 28, the sequences in the second sequence set can be respectively:

Table 29 mask sequence of length 12 (based on formula 11.B)

As shown in Table 29, the sequences in the second sequence set can be respectively:

In the new mask sequence with a length of 12 shown in Table 28 or Table 29, each mask sequence corresponds to a DMRS port, so a total of 12 DMRS ports are newly added (hereinafter referred to as newly added ports). An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 13 .

Specifically, for a DMRS port, corresponding to a mask sequence with a length of 12 in Table 28 or Table 29, the corresponding rule of the mask sequence element index and the time-frequency resource RE is shown in FIG. 13 . A mask sequence contains 12 elements, corresponding to mask sequence element indexes 0 to 11, and the numbers marked in each RE in Figure 13 indicate the index of the mask sequence element. The mask sequence elements corresponding to the mask

sequence element indexes

0, 2, 4, 6, 8, and 10 in Table 10 or Table 11 correspond to

subcarriers

0, 1, 2, 3, 4, and 5 of the first OFDM symbol respectively ; The mask sequence elements corresponding to the mask

sequence element indexes

1, 3, 5, 7, 9, and 11 in Table 10 or Table 11 correspond to

subcarriers

0, 1, 2, 3, 4, and 5 of the second OFDM symbol respectively .

Taking DMRS port 0 and DMRS port 12 as an example, DMRS port 0 adopts a mask sequence with a length of 4, and is mapped on subcarrier 0 and subcarrier 1 corresponding to two OFDM symbols. The DMRS port 12 uses a mask sequence with a length of 12, and is mapped on subcarriers 0 to 5 corresponding to two OFDM symbols.

In the new mask sequence of length 12 shown in Table 28 or Table 29, any two mask sequences are orthogonal, that is, the 12 long mask sequences corresponding to any two ports in the newly added ports are orthogonal . In addition, the correlation coefficient between the mask sequence corresponding to any one of the existing Type 2 DMRS ports and any one of the 12 new mask sequences shown in Table 28 or Table 29 is

Specifically, for the existing NR Type 2 DMRS port 0, according to the rules shown in Figure 13, the corresponding DMRS mask sequence extended to length 12 can be expressed as {+1 +1 0 0 0 0 +1 +1 0 0 0 0} . The cross-correlation coefficient between this sequence and any new mask sequence in Table 28 or Table 29 is

Therefore, for the mask sequence corresponding to the newly designed DMRS port, the mask sequence corresponding to the existing DMRS port maintains an extremely low cross-correlation property, so that the quality of channel estimation can be guaranteed to the greatest extent.

Taking Figure 13 as an example, the mth element r(m) in the DMRS sequence corresponding to port p among the 12 newly added DMRS ports is mapped to the resource element RE with the index (k,l) _p,μ according to the following rules superior. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain, and the mapping rule satisfies:

p is the index of the DMRS port,

is the symbol index of the start OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w(k′,l′) is the frequency domain mask element corresponding to the subcarrier with the index k’ and the index is l’ The time domain mask element corresponding to the OFDM symbol. μ represents the subcarrier spacing parameter,

is the power scaling factor.

Corresponding to the mask sequence shown in Table 10, the value of w(k', l') corresponding to DMRS port p can be determined according to Table 12.

Table 30 new design length is 12 mask sequence corresponding mapping rules (corresponding table 28)

Corresponding to the mask sequence shown in Table 29, the value of w(k', l') corresponding to DMRS port p can be determined according to Table 31.

Table 31 new design length is 12 mask sequence corresponding mapping rules (corresponding table 29)

This application is aimed at the port expansion method of NR Type 2 DMRS. In the same time-frequency resource block, the existing NR Type 2 DMRS port and the newly added DMRS port respectively use a mask sequence with a length of 4 and a mask with a length of 12. sequence. By design, any two of the 12 length-12 mask sequences are orthogonal. Any sequence in the mask sequence with a length of 4 and any sequence in the set of mask sequences with a length of 12 guarantee extremely low cross-correlation. Therefore, the expansion of the DMRS port can be doubled without increasing the time-frequency resources, and the interference between the original port and the newly added port of the protocol can be reduced to the greatest extent, so as to ensure the quality of channel estimation.

In order to multiplex the same time-frequency resource for more DMRS ports, the present application designs a set of mask sequences (ie, the second sequence set) with a length of 8, wherein one mask sequence set includes 8 mask sequences. Each mask sequence contains 8 elements. Each mask sequence corresponds to a new DMRS port, so at least eight DMRS ports can be added.

In the following, taking the second sequence set containing an orthogonal mask sequence as an example, the sequence with a length of 8 proposed in the embodiment of the present application and its application will be described through implementation mode 7.

Implementation method seven:

In order to multiplex more DMRS ports in the same time-frequency resource and ensure that the newly added DMRS ports do not affect the channel estimation performance of the existing DMRS ports, the existing ports and the newly added ports can also be frequency-divided reuse. For example, for Type 2 DMRS, 12 DMRS ports are divided into 3 CDM groups. Within 6 consecutive sub-carriers and 2 OFDM symbols, it is divided into 3 time-frequency resource sub-blocks, and each time-frequency resource sub-block includes 2 consecutive sub-carriers and 2 OFDM symbols. In an implementation manner, one time-frequency resource sub-block corresponds to one CDM group. As shown in FIG. 5 , the DMRS signals corresponding to the 4 DMRS ports included in each CDM group are mapped to all REs included in the same resource sub-block.

In one implementation, the existing DMRS ports belong to 4 DMRS ports included in 1 CDM group among the 3 CDM groups, and the existing ports occupy one of the 3 time-frequency resource sub-blocks, and the newly added ports can occupy The remaining 2 sub-blocks in the 3 time-frequency resource sub-blocks. As shown in Figure 14, existing ports 0 to 3 correspond to CDM group 0, and are mapped to two consecutive subcarriers (subcarrier 0 and subcarrier 1) and two consecutive OFDM symbols ( 4 REs corresponding to symbol 0 and symbol 1). In order to ensure compatibility, existing ports 0 to 3 can be assigned to existing devices (the existing devices cannot know the newly added ports, and do not have the ability to detect the newly added ports). Newly added ports 4 to 19 correspond to CDM group 1, and are mapped to consecutive 4 subcarriers (subcarrier 2, subcarrier 3, subcarrier 4, subcarrier 5) and consecutive 2 subcarriers based on an orthogonal mask sequence of length 8 On 8 REs corresponding to OFDM symbols (symbol 0 and symbol 1). The newly added ports 4-19 can be assigned to new devices (the newly added ports can be learned and have the ability to detect the newly added ports).

In another implementation, the existing port is mapped to two consecutive subcarriers (subcarrier 4 and subcarrier 5) and two consecutive OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 4 on the corresponding 4 REs. In order to ensure compatibility, existing ports can be allocated to existing devices (existing devices cannot learn about newly added ports, and do not have the ability to detect newly added ports). The newly added port is mapped to four consecutive subcarriers (subcarrier 0, subcarrier 1, subcarrier 2, subcarrier 3) and two consecutive OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 8. ) corresponding to 8 REs. The newly added port can be assigned to the new device (the newly added port can be learned and the detection capability of the newly added port can be obtained).

In another implementation, the existing DMRS ports belong to 8 DMRS ports contained in 2 CDM groups in the 3 CDM groups, the existing ports can occupy 2 sub-blocks in the 3 time-frequency resource sub-blocks, and the newly added ports The remaining 1 sub-block among the 3 time-frequency resource sub-blocks may be occupied. Specifically, the existing DMRS port occupies CDM group 0 and CDM group 1, that is, the existing DMRS port is mapped to four consecutive subcarriers (subcarrier 0, subcarrier 1, subcarrier 2, and subcarrier 3). The newly added DMRS port occupies CDM group 2, that is, the existing DMRS port is mapped to two consecutive subcarriers (subcarrier 4 and subcarrier 5). Or the existing DMRS port occupies the CDM group 1 and the CDM group 2, that is, the existing DMRS port is mapped to four consecutive subcarriers (subcarrier 2, subcarrier 3, subcarrier 4, and subcarrier 5). The newly added DMRS port occupies CDM group 0, that is, the existing DMRS port is mapped to two consecutive subcarriers (subcarrier 0 and subcarrier 1).

Assuming that the existing DMRS ports belong to 4 DMRS ports contained in one of the 3 CDM groups, the existing ports occupy one of the 3 time-frequency resource sub-blocks, and the newly added ports can occupy 3 time-frequency resource sub-blocks Taking the case of the remaining 2 sub-blocks in the block as an example, multiple mask sequence sets with a length of 8 can also be designed, and one mask sequence set includes 8 mask sequences. Each mask sequence corresponds to a newly added DMRS port.

Taking two mask sequence sets with a length of 8 as an example, 8 DMRS ports can be added. Taking three mask sequence sets with a length of 8 as an example, 16 DMRS ports can be added.

For example, the orthogonal mask sequences included in the mask sequence set with a length of 8 are shown in Table 32-Table 34.

Table 32 Mask sequence set 1 with length 8

Table 33 Mask sequence set 2 with length 8

Table 34 Mask sequence set 3 with length 8

Each mask sequence in the new mask sequence sets with a length of 8 shown in Table 32 to Table 34 corresponds to a DMRS port (hereinafter referred to as newly added ports). An element included in each sequence corresponds to an RE included in the time-frequency resource block shown in FIG. 15 .

Specifically, for a DMRS port, corresponding to a mask sequence with a length of 8 in Table 14-Table 16, the corresponding rule of the mask sequence element index and the time-frequency resource RE is shown in FIG. 14 . Among them, the mask sequence elements corresponding to the mask sequence element indexes 0 to 3 in Table 14 to Table 16 correspond to the 4 subcarriers of the first OFDM symbol respectively; the mask sequence elements corresponding to the mask sequence element indexes 4 to 7 in Table 14 to Table 16 The code sequence elements respectively correspond to the 4 subcarriers of the second OFDM symbol.

It should be understood that FIG. 14 is an example rather than a limitation, and the elements of the mask sequence can also follow other mapping rules. For example, the 8 elements contained in the sequence with a length of 8 can be mapped on subcarriers 0 to 3, and the existing ports correspond to The 4 elements included in the sequence with a length of 4 can be mapped on subcarriers 4-5, which is not limited in this application.

The DMRS port corresponding to the mask sequence with a length of 8 (newly designed mask sequence) and the DMRS port corresponding to the mask sequence with a length of 4 (the existing NR mask sequence with a length of 4) are mapped in a frequency division multiplexing manner In the time-frequency resource block of 12 REs. Taking two mask sequence sets with a length of 8 as an example to add 8 DMRS ports, the corresponding relationship between DMRS ports, mask sequence sets and REs contained in time-frequency resource blocks is shown in Figure 14 . For the 4 REs composed of subcarrier 0 and subcarrier 1 corresponding to OFDM symbol 0 and symbol 1, DMRS symbols corresponding to 4 DMRS ports are mapped, and the 4 REs correspond to existing mask sequences with NR length 4 respectively. For the 8 REs composed of subcarrier 2 to subcarrier 5 corresponding to OFDM symbol 0 and symbol 1, DMRS symbols corresponding to 16 DMRS ports are mapped, corresponding to port indexes 4 to 19, and different 8 long mask sequences are used to multiplex in All 8 REs.

Taking DMRS port 0 and DMRS port 4 as an example, DMRS port 0 adopts a mask sequence with a length of 4, and is mapped on subcarrier 0 and subcarrier 1 corresponding to two OFDM symbols. The DMRS port 4 adopts a mask sequence with a length of 8, and is mapped on subcarriers 2 to 5 corresponding to two OFDM symbols.

Among the three mask sequence sets with a length of 8 shown in Table 32 to Table 34, any two mask sequences in each mask sequence set are orthogonal. In addition, in any two mask sequence sets, each mask sequence set selects a mask sequence, then the cross-correlation coefficient between the two mask sequences is

Therefore, the DMRS resource mapping method shown in Figure 14 reserves a mask sequence group with a length of 4, which can be used to be compatible with the existing NR Type 2 DMRS. In addition, a new mask sequence group with a length of 8 is added, and the cross-correlation between the mask sequences in this sequence group is low, so that it can ensure multiplexing of more DMRS ports in fixed time-frequency resources while , to ensure the channel estimation performance.

Taking Fig. 14 as an example, the port p among the 20 DMRS ports corresponds to the mth r(m) in the DMRS sequence, and is mapped to the RE whose index is (k, l) _{p, μ} according to the following rules. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index 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(k',l') is the mask sequence corresponding to the OFDM symbol with index l' and the subcarrier with index k' element. μ represents the subcarrier spacing parameter,

is the power scaling factor.

Corresponding to the mask sequences shown in Table 32 and Table 33, the value of w(k', l') corresponding to DMRS port p can be determined according to Table 35.

Table 35 newly designed mask sequence corresponding mapping rules (corresponding Table 32 and Table 33)

This application is aimed at the port expansion method of NR Type 2 DMRS. In the same time-frequency resource block, 6 subcarriers are divided into 2 time-frequency resource subgroups by frequency division. One subgroup contains 4 REs, and the other The subgroup contains the remaining 8 REs. For a subgroup containing 4 REs, a mask sequence with a length of 4 is used to map 4 DMRS ports correspondingly. For a subgroup containing 8 REs, 2 sets of mask sequences with a length of 8 are used to map 16 DMRS ports, or 3 sets of mask sequences with a length of 8 are used to map 24 DMRS ports. By design, any two sequences in each set of mask sequences with a length of 8 are orthogonal. An extremely low cross-correlation is guaranteed between any two mask sequences of length 8 belonging to different groups. Therefore, without increasing time-frequency resources, while ensuring compatibility with existing DMRS ports, 0.6 times or 1.3 times expansion of DMRS ports can be achieved, and interference between newly added ports can be minimized to ensure channel estimation the quality of.

Based on the same inventive concept as that of the method embodiment in FIG. 6 , the embodiment of the present application provides a communication device through FIG. 16 , which can be used to perform the functions of the relevant steps in the above method embodiment. The functions described above may be realized by hardware, or may be realized by software or hardware executes corresponding software. The hardware or software includes one or more modules corresponding to the above functions. The structure of the communication device is shown in FIG. 16 , including a communication unit 1101 and a processing unit 1102 . The communication apparatus 1100 can be applied to network devices or terminal devices in the communication system shown in FIG. 1 , and can implement the communication methods provided in the above embodiments and examples of the present application. The functions of each unit in the communication device 1100 are introduced below.

The communication unit 1101 is configured to receive and send data.

Wherein, the communication unit 1101 can be realized by a transceiver, for example, a mobile communication module. Wherein, the mobile communication module may include at least one antenna, at least one filter, a switch, a power amplifier, a low noise amplifier (low noise amplifier, LNA) and the like. The AN device can communicate with the accessed terminal device through the mobile communication module.

The processing unit 1102 may be configured to support the communication device 1100 to execute the processing actions in the foregoing method embodiments. The processing unit 1102 may be implemented by a processor. For example, the processor can be a central processing unit (central processing unit, CPU), and can also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC) , field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

In an implementation manner, the communication apparatus 1100 is applied to the sending device in the embodiment shown in FIG. 6 . The specific functions of the processing unit 1102 in this embodiment will be introduced below.

The processing unit 1102 is configured to send indication information through the communication unit 1101; the indication information is used to indicate that a port belongs to a first port set or a second port set; the first port set corresponds to a first resource, and the second port set corresponds to a first resource. The port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.

Optionally, the first set of ports corresponds to a first reference signal, and the second set of ports corresponds to a second reference signal; the number of first reference signal ports contained in the first set of ports is less than that contained in the second set of ports The number of second reference signal ports.

Optionally, the processing unit 1102 is configured to: obtain a first sequence; elements in the first sequence correspond to resource elements RE in the first resource; and/or obtain a second sequence; The elements in the second sequence have a one-to-one correspondence with the REs in the first resource and the second resource; wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence .

Optionally, the first sequence belongs to a first sequence set, and the sequences in the first sequence set have a one-to-one correspondence with at least one first reference signal; the second sequence belongs to a second sequence set, and the second The sequences in the sequence set correspond one-to-one to at least one second reference signal; any sequence in the first sequence set is orthogonal to any sequence in the first subset in the second sequence set, and is orthogonal to the second sequence set The cross-correlation coefficient of any sequence other than the first subset in the two-sequence set is

or

Or, the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is

or

Optionally, the number of elements included in the sequences in the first sequence set is 2, and the number of elements included in the sequences in the second sequence set is 4 or 6.

Optionally, the sequences in the first sequence set are orthogonal to each other; the sequences in the second sequence set are orthogonal to each other.

Optionally, the first subset includes half of the sequences in the second sequence set.

Optionally, when the number of elements included in the sequences in the second sequence set is 6, each sequence in the second sequence set is a row vector of matrix b; or, when the second sequence When the number of elements included in the sequences in the set is 4, each sequence in the second sequence set includes 4 elements in a row vector in the matrix b.

Among them, the matrix b satisfies one of the following formulas:

In an implementation manner, the communication apparatus 1100 is applied to the receiving device in the embodiment of the present application shown in FIG. 6 . The specific functions of the processing unit 1102 in this embodiment will be introduced below.

The processing unit 1102 is configured to receive indication information through the communication unit 1101; the indication information is used to indicate that a port belongs to a first port set or a second port set; the first port set corresponds to a first resource, and the second port set Corresponding to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.

Optionally, the elements in the first sequence are in one-to-one correspondence with the REs in the first resource; the elements in the second sequence are in one-to-one correspondence with the REs in the first resource and the second resource; wherein, The number of elements contained in the first sequence is different from the number of elements contained in the second sequence.

or

Among them, the matrix b satisfies one of the following formulas:

It should be noted that the division of modules in the above embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods. In addition, each function in each embodiment of the present application Units can be integrated into one processing unit, or physically exist separately, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

Based on the same technical concept, the embodiment of the present application provides a communication device as shown in FIG. 17 , which can be used to execute the relevant steps in the above method embodiments. The communication device can be applied to network devices or terminal devices in the communication system shown in FIG. 1 , can implement the communication methods provided in the above embodiments and examples of the present application, and has the functions of the communication device shown in FIG. 16 . Referring to FIG. 17 , the communication device 1200 includes: a communication module 1201 , a processor 1202 and a memory 1203 . Wherein, the communication module 1201, the processor 1202 and the memory 1203 are connected to each other.

Optionally, the communication module 1201 , the processor 1202 and the memory 1203 are connected to each other through a bus 1204 . The bus 1204 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus or the like. The bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 17 , but it does not mean that there is only one bus or one type of bus.

The communication module 1201 is used to receive and send data to realize communication interaction with other devices. For example, the communication module 1201 may be implemented through a physical interface, a communication module, a communication interface, or an input/output interface.

The processor 1202 may be configured to support the communication device 1200 to execute the processing actions in the foregoing method embodiments. When the communication device 1200 is used to implement the foregoing method embodiments, the processor 1202 may also be configured to implement the functions of the foregoing processing unit 1102 . The processor 1202 may be a CPU, or other general-purpose processors, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

In an implementation manner, the communication device 1200 is applied to the sending device in the embodiment of the present application shown in FIG. 6 . The processor 1202 is specifically used for:

sending indication information through the communication module 1201; the indication information is used to indicate that the port belongs to the first port set or the second port set;

The first port set corresponds to a first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.

In an implementation manner, the communication device 1200 is applied to the receiving device in the embodiment of the present application shown in FIG. 6 . The processor 1202 is specifically used for:

Receive indication information through the communication module 1201; the indication information is used to indicate that the port belongs to the first port set or the second port set;

For the specific functions of the processor 1202, refer to the above descriptions in the communication methods provided in the embodiments of the present application and examples, as well as the specific functional descriptions of the communication device 1100 in the embodiments of the present application shown in FIG. 16 , which are not repeated here. repeat.

The memory 1203 is used to store program instructions and data. Specifically, the program instructions may include program codes including computer operation instructions. The memory 1203 may include a RAM, and may also include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. The processor 1202 executes the program instructions stored in the memory 1203, and uses the data stored in the memory 1203 to implement the above functions, thereby realizing the communication method provided by the above embodiments of the present application.

It can be understood that the memory 1203 in FIG. 17 of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory can be ROM, programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM) , EEPROM) or flash memory. Volatile memory can be RAM, which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (Static RAM, SRAM), Dynamic Random Access Memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM ) and Direct Memory Bus Random Access Memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

Based on the above embodiments, an embodiment of the present application further provides a computer program that, when the computer program is run on a computer, causes the computer to execute the method provided in the above embodiments.

Based on the above embodiments, the embodiments of the present application also provide a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a computer, the computer executes the method provided in the above embodiments .

Wherein, the storage medium may be any available medium that can be accessed by a computer. By way of example but not limitation: computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or may be used to carry or store information in the form of instructions or data structures desired program code and any other medium that can be accessed by a computer.

Based on the above embodiments, an embodiment of the present application further provides a chip, the chip is used to read a computer program stored in a memory, and implement the method provided in the above embodiments.

Based on the above embodiments, an embodiment of the present application provides a chip system, where the chip system includes a processor, configured to support a computer device to implement functions involved in each device in the above embodiments. In a possible design, the chip system further includes a memory, and the memory is used to store necessary programs and data of the computer device. The system-on-a-chip may consist of chips, or may include chips and other discrete devices.

To sum up, the embodiments of the present application provide a communication method, device, and device. The method is as follows: the sending device may send indication information, where the indication information is used to indicate that a port belongs to the first port set or the second port set. Wherein, the first port set corresponds to the first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource. When the sending device needs to send the first reference signal corresponding to the first port set, it can send the first reference signal through the first resource; when the sending device needs to send the second reference signal corresponding to the second port set, it can use the first resource and the second resource to send the second reference signal. Through this method, more reference signal ports can be supported on limited resources, and thus more transmission streams can be supported.

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. 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, etc.) 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 present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Apparently, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A communication method, characterized in that, comprising:

sending indication information; the indication information is used to indicate that the port belongs to the first port set or the second port set;

The first port set corresponds to a first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.
The method of claim 1, wherein

The first set of ports corresponds to a first reference signal, and the second set of ports corresponds to a second reference signal;

The number of first reference signal ports included in the first port set is smaller than the number of second reference signal ports included in the second port set.
The method according to claim 1 or 2, further comprising:

Acquiring a first sequence; elements in the first sequence correspond one-to-one to resource elements RE in the first resource; and/or

Acquiring a second sequence; elements in the second sequence correspond one-to-one to REs in the first resource and the second resource;

Wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence.
The method of claim 3, wherein

The first sequence belongs to a first sequence set, and sequences in the first sequence set are in one-to-one correspondence with at least one first reference signal;

The second sequence belongs to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one-to-one;

Any sequence in the first set of sequences is orthogonal to any sequence in the first subset of the second set of sequences, and is orthogonal to any sequence in the second set of sequences other than the first subset The correlation coefficient of
or
Or, the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is
or
The method according to claim 4, wherein the number of elements included in the sequences in the first sequence set is 2, and the number of elements included in the sequences in the second sequence set is 4 or 6.
The method according to claim 4 or 5, characterized in that,

The sequences in the first sequence set are orthogonal to each other;

The sequences in the second set of sequences are orthogonal to each other.
The method according to any one of claims 4 to 6, wherein the first subset comprises half of the sequences in the second set of sequences.
The method according to any one of claims 4 to 7, characterized in that,

When the number of elements included in the sequence in the second sequence set is 6, each sequence in the second sequence set is a row vector of matrix b; or,

When the number of elements included in the sequence in the second sequence set is 4, each sequence in the second sequence set includes 4 elements in a row vector in matrix b;

Among them, the matrix b satisfies one of the following formulas:
A communication method, characterized in that, comprising:

receiving indication information; the indication information is used to indicate that the port belongs to the first port set or the second port set;

The first port set corresponds to a first resource, and the second port set corresponds to the first resource and the second resource; the first resource and the second resource are located on the same time domain resource.
The method of claim 9, wherein

The first set of ports corresponds to a first reference signal, and the second set of ports corresponds to a second reference signal;

The number of first reference signal ports included in the first port set is smaller than the number of second reference signal ports included in the second port set.
The method according to claim 9 or 10, characterized in that,

Elements in the first sequence correspond one-to-one to resource elements RE in the first resource;

The elements in the second sequence correspond one-to-one to the REs in the first resource and the second resource;

Wherein, the number of elements contained in the first sequence is different from the number of elements contained in the second sequence.
The method of claim 11, wherein,

The first sequence belongs to a first sequence set, and sequences in the first sequence set are in one-to-one correspondence with at least one first reference signal;

The second sequence belongs to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one-to-one;

Any sequence in the first set of sequences is orthogonal to any sequence in the first subset of the second set of sequences, and is orthogonal to any sequence in the second set of sequences other than the first subset The correlation coefficient of
or
Or, the cross-correlation coefficient between any sequence in the first sequence set and any sequence in the second sequence set is
or
The method according to claim 12, wherein the number of elements included in the sequences in the first sequence set is 2, and the number of elements included in the sequences in the second sequence set is 4 or 6.
The method according to claim 12 or 13, characterized in that,

The sequences in the first sequence set are orthogonal to each other;

The sequences in the second set of sequences are orthogonal to each other.
The method according to any one of claims 12 to 14, wherein the first subset comprises half of the sequences in the second set of sequences.
The method according to any one of claims 12 to 15, wherein,

When the number of elements included in the sequence in the second sequence set is 6, each sequence in the second sequence set is a row vector of matrix b; or,

When the number of elements included in the sequence in the second sequence set is 4, each sequence in the second sequence set includes 4 elements in a row vector in matrix b;

Among them, the matrix b satisfies one of the following formulas:
A communication device, characterized by comprising:

a communication unit for receiving and sending data;

A processing unit, configured to execute the method according to any one of claims 1-16 through the communication unit.
A communication system, characterized in that it includes:

A sending device, configured to implement the method according to any one of claims 1-8;

The receiving device is configured to implement the method according to any one of claims 9-16.
A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, and when the computer program is run on a computer, the computer is made to execute the computer program described in any one of claims 1-16. described method.
A chip, characterized in that the chip is coupled to a memory, and the chip reads a computer program stored in the memory to execute the method according to any one of claims 1-16.