CN116436579A

CN116436579A - Communication method, device and equipment

Info

Publication number: CN116436579A
Application number: CN202111673572.2A
Authority: CN
Inventors: 董昶钊; 李博; 高翔; 刘鹍鹏; 曲秉玉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2023-07-14
Also published as: WO2023125697A1

Abstract

The application discloses a communication method, a device and equipment. The method comprises the following steps: the transmitting device may transmit indication information for indicating that the port belongs to the first port set or the second port set. 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 transmitting device needs to transmit the first reference signal corresponding to the first port set, the first reference signal can be transmitted through the first resource, and when the transmitting device needs to transmit the second reference signal corresponding to the second port set, the second reference signal can be transmitted through the first resource and the second resource. By the method, more reference signal ports can be supported on limited resources, and further more transmission stream numbers can be supported.

Description

Communication method, device and equipment

Technical Field

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

Background

The demodulation reference signals (demodulation reference signal, DMRS) can be used to estimate an equivalent channel matrix of a data channel (e.g., physical downlink shared channel (physical downlink shared channel, PDSCH)) or a control channel (e.g., physical downlink control channel (physical downlink control channel, PDCCH)) for detection and demodulation of data.

Generally, one DMRS port (port) corresponds to one spatial layer, and each spatial layer corresponds to one transport stream. For a multiple-input multiple-output (multiple input and multiple output, MIMO) transmission with a number of transmission streams R, the number of DMRS ports required is R. The fifth generation (the 5) ^th 5G) New Radio (NR) supports 2DMRS resource mapping types, configuration Type 1 (Type 1) DMRS and configuration Type 2 (Type 2) DMRS, respectively. For single symbol DMRS configuration, type 1DMRS can support up to 4 orthogonal DMRS ports, and Type 2DMRS can support up to 6 orthogonal DMRS ports. Thus, for single symbol DMRS configurations, NR can only support MIMO transmission of 6 streams at maximum.

As future wireless communication device deployments become denser, the number of terminal devices increases further, which puts higher demands on the MIMO transport stream numbers. In addition, with the continuous evolution of the large-scale MIMO (Massive MIMO) system, the number of transceiver antennas is further increased (for example, the number of transmitting antennas of the network device supports 128T or 256T, and the number of receiving antennas of the terminal supports 8R), so that the acquisition of the channel information is more accurate, and thus, higher number of transmission streams can be further supported to improve the spectrum efficiency of the MIMO system. This tends to require more DMRS ports to support higher transmission streams (single symbol greater than 6 streams). Therefore, improvements to the current DMRS configuration are needed to support higher transport streams.

Disclosure of Invention

The application provides a communication method, a device and equipment, which are used for supporting more transmission stream numbers.

In a first aspect, embodiments of the present application provide a communication method. The method may be performed by a transmitting device, which may be, for example, a network device or a terminal device in the communication system shown in fig. 1 below. The method comprises the following steps:

the transmitting device may transmit indication information for indicating that the port belongs to the first port set or the second port set. 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.

Where the same time domain resource may be the same time unit, e.g., the same OFDM symbol, or the same two OFDM symbols.

By this method, the transmitting device can transmit the 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, the transmitting device needs to transmit a first reference signal corresponding to the first port set, the transmitting device can transmit the first reference signal through a first resource; when the port belongs to the second port set, that is, the transmitting device needs to transmit the second reference signal corresponding to the second port set, the transmitting device may transmit the second reference signal through the first resource and the second resource. By the method, more reference signal ports can be supported on limited resources, and further more transmission stream numbers can be supported.

In one possible design, the first set of ports corresponds to a first reference signal and the second set of ports corresponds to a second reference signal; the first port set includes a first reference signal port number that is less than a second reference signal port number that the second port set includes.

It should be understood that the first reference signal and the second reference signal may represent one or more reference signal symbols, where the one or more reference signal symbols are mapped on 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 an added port.

With this design, the first resource may correspond to different sets of ports (e.g., CDM groups, hereinafter) at the same time, and the number of reference signal ports that can be supported by the two sets of ports corresponding to the first resource is different. In this way, the reference signals corresponding to the two port sets can be mapped to part of the same time-frequency resources, so that the port number corresponding to the time-frequency resources is increased, and further more transmission stream numbers can be supported.

In one possible design, the transmitting device may also acquire the first sequence and/or the second sequence. The first sequence corresponds to the first resource, and 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, and 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.

Thus, when the port belongs to the first port set, that is, the transmitting device needs to transmit the first reference signal corresponding to the first port set, the transmitting device may acquire the first sequence corresponding to the port, and map the first reference signal onto the first resource according to the first sequence. When the port belongs to the second port set, that is, the transmitting device needs to transmit the second reference signal corresponding to the second port set, the transmitting device may acquire the second sequence corresponding to the port, and map the second reference signal to the first resource and the second resource according to the second sequence.

By the design, the first reference signal and the second reference signal carried by the first resource can be distinguished by a first sequence and a second sequence with different lengths; thus, more reference signal ports and more transport streams can be supported.

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

Optionally, an average value of a plurality of values formed by 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 one of the first set of sequences and any one of the second set of sequences is less than or equal to a first threshold, i.e., each sequence of the first set of sequences and each sequence of the second set of sequences exhibits a low cross-correlation.

The relationship of the first set of sequences to the second set of sequences may be one of:

relationship one:

any sequence in the first sequence set is orthogonal to any sequence in the first subset of the second sequence set, and the cross-correlation coefficient of any sequence outside the first subset of the second sequence set is

Relationship II:

the cross-correlation coefficient of any one sequence in the first sequence set and any one sequence in the second sequence set is

Relationship III:

Relationship four:

Relationship five:

Relationship six:

Relationship seven:

Optionally, on the basis of any of the above relationships, the plurality of sequences included in the first sequence set are orthogonal to each other, and the plurality of 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 comprises half of the sequences in the second set of sequences. For example, when the second set of sequences includes 6 sequences, the first subset includes 3 sequences in the second set of sequences; alternatively, when the second set of sequences includes 4 sequences, the first subset includes 3 sequences in the second set of sequences.

With this design, there is a low cross-correlation between the sequences comprised by the two sequence sets. The two sequence sets correspond to the existing port and the newly added port respectively. Therefore, the DMRS signals corresponding to the existing ports and the DMRS signals corresponding to any newly added port are in low cross correlation, so that the reusability of the existing ports and the newly added ports is ensured, and further, the minimization of interference between the DMRS signals corresponding to the existing DMRS ports and the DMRS signals corresponding to the newly added ports is ensured.

In one possible design, the sequences in the second set of sequences may be determined by one of the following:

Mode one: 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 the matrix b.

Mode two: when the sequences in the second sequence set include 4 elements, each sequence in the second sequence set contains 4 elements in one row vector in the matrix b.

In one or two modes, the matrix b satisfies one of the following formulas:

mode three: when the sequences in the second sequence set include 12 elements, each sequence in the second sequence set is a row vector of the matrix B.

Wherein, the liquid crystal display device comprises a liquid crystal display device,

or alternatively

Or alternatively

In the third mode, the matrix b satisfies one of the following formulas:

the design provides examples of a plurality of second sequence sets. Through the design, the sequences in the second sequence set can be flexibly acquired.

In a second aspect, embodiments of the present application provide a communication method. The method may be performed by a receiving device, which may be, for example, a network device or a terminal device in the communication system shown in fig. 1 below. The method comprises the following steps:

the receiving equipment receives the indication information; the indication information is used for indicating that the port belongs to the first port set or the second port set. 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.

By the method, the receiving device can determine whether the indication 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, namely the receiving device needs to receive a first reference signal corresponding to the first port set, the receiving device can receive the first reference signal through a first resource; when the port belongs to the second port set, that is, the receiving device needs 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. By the method, more reference signal ports can be supported on limited resources, and further more transmission stream numbers can be supported.

In one possible design, the first sequence corresponds to the first resource, and in particular, the elements in the first sequence correspond one-to-one to REs in the first resource. The second sequence corresponds to the first resource and the second resource, and 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.

By the 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 resource 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 with different lengths; thus, more reference signal ports and more transport streams can be supported.

In one possible design, the first sequences belong to a first set of sequences, the sequences in the first set of sequences being in one-to-one correspondence with at least one first reference signal. The second sequences belong to a second sequence set, and sequences in the second sequence set are in one-to-one correspondence with at least one second reference signal. The relationship of the first set of sequences to the second set of sequences may be one of:

Relationship one:

Relationship II:

Relationship III:

Relationship four:

In one or two modes, the matrix b satisfies one of the following formulas:

In a third aspect, embodiments of the present application provide a communication apparatus comprising means for performing the steps of any of the above aspects.

In a fourth aspect, embodiments of the present application provide a communication device comprising at least one processing element and at least one storage element, wherein the at least one storage element is configured to store programs and data, and the at least one processing element is configured to read and execute the programs and data stored by the storage element, such that the method provided in any one of the above aspects of the present application is implemented.

In a fifth aspect, embodiments of the present application provide a communication system, including: a transmitting device for performing the method provided in the first aspect, and a receiving device for performing the method provided in the second aspect. When the sending device is a network device, the receiving device may be a terminal device; when the transmitting device is a terminal device, the receiving device may be a network device.

In a sixth aspect, embodiments of the present application further provide a computer program which, when run on a computer, causes the computer to perform the method provided in any one of the above aspects.

In a seventh aspect, embodiments of the present application further provide a computer readable storage medium having a computer program stored therein, which when executed by a computer, causes the computer to perform the method provided in any of the above aspects.

In an eighth aspect, embodiments of the present application further provide a chip, where the chip is configured to read a computer program stored in a memory, and perform the method provided in any one of the above aspects.

In a ninth aspect, embodiments of the present application further provide a chip system, where the chip system includes a processor, and the processor is configured to support a computer device to implement the method provided in any one of the above aspects. In one possible design, the chip system further includes a memory for storing programs and data necessary for the computer device. The chip system may be formed of a chip or may include a chip and other discrete devices.

The technical effects that can be achieved by any one of the third aspect to the ninth aspect may be explained with reference to the technical effects that can be achieved by any one of the possible designs of any one of the first aspect or the second aspect, and the discussion will be omitted.

Drawings

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

fig. 2 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another network device according to an embodiment of the present application;

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

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

fig. 6 is a schematic flow chart of a communication method according to an embodiment of the present application;

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

fig. 8 is a schematic diagram of a first time-frequency resource mapping method according to an embodiment of the present application;

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

fig. 10 is a schematic diagram of a second time-frequency resource mapping method according to an embodiment of the present application;

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

fig. 12 is a schematic diagram of a third time-frequency resource mapping method according to an embodiment of the present application;

fig. 13 is a schematic diagram of a fourth rule of correspondence between a mask sequence element index and a time-frequency resource provided in an embodiment of the present application;

fig. 14 is a schematic diagram of a fourth time-frequency resource mapping method according to an embodiment of the present application;

fig. 15 is a schematic diagram of a fifth rule of correspondence between a mask sequence element index and a time-frequency resource provided in an embodiment of the present application;

Fig. 16 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The application provides a communication method, a device and equipment, which are used for supporting more transmission stream numbers. The method and the device are based on the same technical conception, and because the principles of solving the problems are similar, the implementation of the device and the method can be mutually referred to, and the repetition is not repeated.

Through the scheme provided by the embodiment of the application, the sending device can send the indication information, wherein the indication information is used for indicating that the port belongs to the first port set or the second port set. 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 transmitting device needs to transmit the first reference signal corresponding to the first port set, the first reference signal can be transmitted through the first resource, and when the transmitting device needs to transmit the second reference signal corresponding to the second port set, the second reference signal can be transmitted through the first resource and the second resource. By the method, more reference signal ports can be supported on limited resources, and further more transmission stream numbers can be supported.

In the following, some terms in the embodiments of the present application are explained for easy understanding by those skilled in the art.

1) A terminal device is a device that provides voice and/or data connectivity to a user. The terminal device may also be referred to as a User Equipment (UE), a terminal (terminal), an access terminal, a terminal unit, a terminal station, a Mobile Station (MS), a remote station, a remote terminal, a Mobile Terminal (MT), a wireless communication device, a user terminal device (customer premise equipment, CPE), a terminal agent, or a terminal device, etc.

For example, the terminal device may be a handheld device having a wireless connection function, or may be a vehicle having a communication function, an in-vehicle device (e.g., an in-vehicle communication apparatus, an in-vehicle communication chip), or the like. Currently, examples of some terminal devices are: a mobile phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA) device, a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a tablet, a computer with wireless transceiver capability, a notebook, a palm, a mobile internet device (mobile internet device, MID), a wearable device, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in home (smart home), etc.

2) The network device is a device for accessing the terminal device to the wireless network in the mobile communication system. The network device serves as a node in the radio access network and may also be referred to as a base station, a radio access network (radio access network, RAN) node (or device), AN Access Point (AP), AN Access Network (AN) device.

Currently, examples of some network devices are: new generation Node bs (generation Node B, gNB), transmission reception points (transmission reception point, TRP), evolved Node bs (enbs), radio network controllers (radio network controller, RNC), node bs (Node bs, NB), base station controllers (base station controller, BSC), base transceiver stations (base transceiver station, BTS), transmission points (transmitting and receiving point, TRP), transmission points (transmitting point, TP), mobile switching centers, home base stations (e.g., home evolved NodeB, or home Node bs, HNBs), or baseband units (base band units, BBU), etc.

3) Time unit, generally refers to the unit of time. Illustratively, the time units may be, but are not limited to, subframes (subframes), mini-subframes, slots (slots), symbols, transmission time intervals (transmission time interval, TTI), etc. Wherein the symbols may be time domain symbols (e.g., orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols) or the like.

4) Spatial layer: for spatial multiplexing MIMO systems, multiple parallel data streams can be transmitted simultaneously on the same frequency domain resource, each of which is referred to as a spatial layer. The spatial layer in MIMO may also be referred to as a transport layer, a data layer, a spatial stream, etc.

In the embodiments of the present application, the number of nouns, unless otherwise indicated, means "a singular noun or a plural noun", i.e. "one or more". "at least one" means one or more, and "a plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. For example, A/B, means: a or B. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s).

In addition, it should be understood that in the description of this application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not be construed as indicating or implying a relative importance or order.

A communication system to which the embodiments of the present application are applied will be described below with reference to the accompanying drawings.

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

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

The terminal equipment is an entity capable of receiving and transmitting wireless signals at the user side and needs to access a network through the network equipment. The terminal device may be a variety of devices that provide voice and/or data connectivity to the user.

The terminal equipment is provided with a plurality of transmitting antennas and a plurality of receiving antennas, has multiple transmitting capability and multiple receiving capability, can transmit signals through a plurality of transmitting channels and can receive signals through a plurality of receiving channels.

The network device also has multiple transmit antennas and multiple receive antennas, with multiple capabilities and multiple receive capabilities. When the terminal device and the network device have multiple capabilities and multiple-receiving capabilities, the system may also be referred to as a MIMO system.

The structure of the network device in the embodiment of the present application may be shown in fig. 2, for example. In particular, the network device may be divided into a Centralized Unit (CU) node and at least one Distributed Unit (DU). Wherein a CU may be used to manage or control at least one DU, also referred to as CU is connected to at least one DU. This architecture allows for the decoupling of protocol layers of network devices in a communication system, wherein part of the protocol layers are placed in a CU for centralized control, and the remaining part or all of the protocol layer functions are distributed in DUs, which are centrally controlled by the CU. Taking the network device as the gNB, protocol layers of the gNB include a radio resource control (radio resource control, RRC) layer, a service data adaptation protocol (service data adaptation protocol, SDAP) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control, RLC) layer, a medium access control sublayer (media access control, MAC) layer, and a physical layer. Among them, a CU may be used to implement functions of an RRC layer, an SDAP layer, and a PDCP layer, and a DU may be used to implement functions of an RLC layer, a MAC layer, and a physical layer. The protocol stacks included in the CU and the DU are not specifically limited in the embodiments of the present application.

Illustratively, a CU in an embodiment of the present application may be further divided into a control plane (CU-CP) network element and a plurality of user plane (CU-UP) network elements. Wherein the CU-CP may be used for control plane management and the CU-UP may be used for user plane data transmission. The interface between CU-CP and CU-UP may be the E1 port. The interface between the CU-CP and the DU can be F1-C, which is used for the transmission of control plane signaling. The interface between CU-UP and DU can be F1-U, which is used for user plane data transmission. And the CU-UP can be connected through an Xn-U port to carry out user plane data transmission. For example, taking the gNB as an example, the structure of the gNB may be as shown in fig. 3.

It should also be noted that the mobile communication system shown in fig. 1 is taken as an example, and is not limited to the communication system configuration to which the method provided in the embodiment of the present application is applicable. In summary, the method and apparatus provided in the embodiments of the present application are applicable to communication systems and application scenarios in which various terminal devices support multiple capabilities, i.e., the embodiments of the present application may also be applied to various types and standards of communication systems, such as a 5G communication system, a long term evolution (Long Term Evolution, LTE) communication system, NR, wireless-fidelity (WiFi), worldwide interoperability for microwave access (world interoperability for microwave access, wiMAX), vehicle-to-everything (vehicle to everything, V2X), long term evolution-vehicle networking (LTE-V), vehicle-to-vehicle (vehicle to vehicle, V2V), vehicle networking, machine type communication (Machine Type Communications, MTC), internet of things (internet of 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 occur in the future, which embodiments of the present application are not limited.

Currently, DMRS can be used to estimate an equivalent channel experienced by a data channel (e.g., PDSCH) or a control channel (e.g., PDCCH), or to estimate an equivalent channel matrix experienced by a data channel (e.g., PDSCH) or a control channel (e.g., PDCCH), thereby being used for data detection and demodulation. The channel may produce a certain weighting or change (e.g., a change in amplitude, a change in phase, or a change in frequency, etc.) to the experienced signal. The channel may also be referred to as a channel response, which may be represented by a channel response coefficient.

Assuming that the DMRS vector transmitted by the transmitting end is s, the transmitted data (or data symbol) vector is x, and the DMRS and the data perform the same precoding operation (multiply 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 obtain the estimation of the equivalent channel by using the channel estimation algorithm 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 equivalent channels, its dimension is N _R X R. Wherein N is _R For the number of receive antennas, R is the number of transport streams (rank, i.e., the number of data streams or spatial layers). Generally, one DMRS port (may be simply referred to as a port in this application) corresponds to one spatial layer. Therefore, for MIMO transmission with a transport stream number R, the number of DMRS ports required is R.

In order to ensure the quality of channel estimation, different DMRS ports are typically orthogonal ports, so that interference between different DMRS ports can be avoided. The different DMRS ports are orthogonal ports, which means that DMRS symbols corresponding to the different DMRS ports are orthogonal in frequency domain, time-frequency domain or code domain. For one DMRS port, in order to perform channel estimation on different time-frequency resources, to ensure channel estimation quality, multiple DMRS symbols need to be sent in multiple time-frequency resources. The DMRS may occupy at least 1 OFDM symbol in the time domain, and the bandwidth occupied in the frequency domain is the same as the scheduling bandwidth of the scheduled data signal. The plurality of DMRS symbols corresponding to one port corresponds to one reference signal sequence, and one reference signal sequence includes a plurality of reference signal sequence elements.

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

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

k′＝0,1；

n＝0,1,...；

l′＝0,1。

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

for mapping to index (k, l) _p,μ DMRS modulation symbol corresponding to port p on RE,/-for>

Is a power scaling factor, w _t (l ') is a time domain mask element corresponding to an OFDM symbol with index of 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 starting OFDM symbol or the symbol index of the reference OFDM symbol occupied for the DMRS modulation symbol. Wherein the value of m is related to the configuration type.

The resource mapping of the Type 1DMRS and the Type 2DMRS is described below.

For Type 1DMRS:

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

Table 1 Type 1dmrs parameter values

Where λ is an index of a Code Division Multiplexing (CDM) group (may also be referred to as an orthogonal multiplexing group) to which the port p belongs, and DMRS ports in the same orthogonal multiplexing group occupy the same time-frequency resource.

According to equation (1), the time-frequency resource mapping manner of the Type 1DMRS is shown in fig. 4.

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

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

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

For a dual symbol DMRS (corresponding to l' =0 or 1), a maximum of 8 ports is supported, and the DMRS resource occupies two OFDM symbols. The 8 DMRS ports are divided into 2 CDM groups, wherein 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. DMRS ports included in the CDM group are mapped on the same time-frequency resource. The reference signal sequences corresponding to DMRS ports included in the CDM group are distinguished by a mask sequence.

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

For Type 2DMRS:

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

Table 2 Type 2DMRS Port parameter values

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

According to equation (1), the Type 2DMRS time-frequency resource mapping manner is shown in fig. 5.

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

Specifically, the port 0 and the port 1 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking frequency domain resource granularity of 1RB as an example, port 0 and port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7.

Ports

2 and 3 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9.

Ports

4 and 5 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11. For 2DMRS ports contained within one CDM group, it corresponds to a masking sequence of length 2 (+1+1 and +1-1) within 2 adjacent subcarriers.

For a two symbol DMRS, a maximum of 12 ports is supported, and the DMRS resources occupy two OFDM symbols. The 12 DMRS ports are divided into 3 CDM groups, wherein 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. The CDM groups are frequency division multiplexed, and DMRS corresponding to DMRS ports included in the CDM groups are mapped on the same time-frequency resource. The reference signal sequences corresponding to DMRS ports included in the CDM group are distinguished by a mask sequence. For one DMRS port, the corresponding DMRS reference signal is mapped in a plurality of resource sub-blocks containing 2 continuous sub-carriers in the frequency domain, and 4 sub-carriers are separated between adjacent resource sub-blocks in the frequency domain.

Specifically, the port 0, the port 1, the port 6 and the port 7 are located in the same RE, and resource mapping is performed in a comb-tooth manner in the frequency domain. Taking the frequency domain resource granularity of 1RB as an example, the

ports

0, 1, 6 and 7 occupy the

subcarriers

0, 1, 6 and 7 corresponding to the

OFDM symbol

0 and 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 4 DMRS ports included in one CDM group, it corresponds to a masking sequence of length 4 (+1+1+1+1/+1+1-1/+1-1+1+1-1/+1-1+1) in 2 adjacent subcarriers to which 2 OFDM symbols correspond.

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

As described above, at present, a single symbol DMRS in NR can support at most 6 DMRS ports, so that MIMO transmission of 6 streams can be supported at most. As the deployment of wireless communication devices becomes denser in the future, the number of terminal devices further increases, and a higher demand is put on the MIMO transmission stream number. In addition, with the continuous evolution of the subsequent passive MIMO system, the number of transceiving antennas will further increase (for example, the number of transmitting antennas of the network device supports 128T or 256T, and the number of receiving antennas of the terminal supports 8R), so that the channel information acquisition will be more accurate, and higher number of transmission streams can be further supported to improve the spectrum efficiency of the MIMO system. This tends to require more DMRS ports to support higher transport streams (greater than 6 streams).

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

One possible method to expand the number of existing orthogonal DMRS ports is: and adding the time-frequency resources occupied by the DMRS. The method can ensure that the number of resources occupied by the DMRS symbols corresponding to each DMRS port is unchanged. However, as the number of ports increases, the number of resources required for the DMRS ports also increases, more time-frequency resources are required to be occupied, and DMRS overhead is increased. Also, an increase in DMRS overhead may reduce the spectral efficiency of the system.

Another possible approach is to multiplex more DMRS symbols corresponding to non-orthogonal DMRS ports while guaranteeing the same time-frequency resources (overhead). For example, a DMRS sequence of low cross-correlation corresponding to the newly added DMRS is designed. The sequences corresponding to the newly added DMRS ports and the sequences corresponding to the existing DMRS ports ensure low cross correlation. However, the superposition of non-orthogonal ports tends to cause some interference, resulting in a loss of system performance (e.g., channel estimation capability). Therefore, how to introduce a new DMRS port without adding additional time-frequency resource overhead and reduce the impact on the channel estimation performance is a problem to be solved.

The following describes the scheme provided in the present application with reference to the drawings.

The embodiment of the application provides a communication method, which is applied to a communication system shown in fig. 1 and is executed by network equipment or terminal equipment. The flow of the method will be described in detail with reference to the flowchart shown in fig. 6. The sending device may be a network device, and the receiving device may be a terminal device; or the transmitting device may be a terminal device and the receiving device may be a network device. The reference signals include, but are not limited to, DMRS, and the description below mainly uses the reference signals as examples of DMRS, and DMRS may be replaced by other types of reference signals according to actual requirements.

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

s601: the transmitting device transmits the indication information; wherein the indication information may be used to indicate that a port (hereinafter referred to as a first port) belongs to the first port set or the second port set. Accordingly, the receiving device receives the indication information.

Alternatively, the indication information may be transmitted through a message (e.g., RRC message), or may be carried in control information (e.g., uplink control information (uplink control information, UCI), or downlink control information (downlink control information, DCI)).

Wherein the first port set corresponds to the first resource, that is, the reference signals corresponding to the ports in the first port set may be mapped onto the first resource. The second set of ports corresponds to the first resource and the second resource, that is, reference signals corresponding to ports in the second set of ports may be mapped onto 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, e.g., the same symbol (e.g., OFDM symbol), the same two symbols.

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

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

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 a first resource and a second resource corresponding to the second port set.

S602 is described below by taking a single-symbol DMRS and a two-symbol DMRS as examples.

Single symbol DMRS:

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

For example (hereinafter example one), for a single symbol Type 1DMRS, the first port set may include port 0 and port 1, and the first resource includes RE0 and RE2; the second set of ports includes ports 4 through 7 and the second resource includes RE1 and RE3. Thus, the reference signal corresponding to port 0 or the reference signal corresponding to port 1 may be mapped to RE0 and RE2, and the reference signal corresponding to any one of ports 4 to 7 may be mapped to RE0 to RE3.

For another example (hereinafter referred to as example two), for a single symbol Type 2DMRS, the first port set may include port 0 and port 1, and the first resource includes RE0 and RE1; the second set of ports includes ports 12 through 17 and the second resource includes REs 2 through 5. Thus, the reference signal corresponding to port 0 or the reference signal corresponding to port 1 may be mapped to RE0 and RE1, and the reference signal corresponding to any one of ports 12 to 17 may 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 (e.g., 2 subcarriers corresponding to 2 OFDM symbols). The second port set may include 8 ports, and the second resource may include 4 REs (e.g., 2 subcarriers corresponding to 2 OFDM symbols) connected to the first resource; alternatively, the second port set may include 12 ports and the second resource may include 8 REs (e.g., consecutive 4 subcarriers corresponding to 2 OFDM symbols) connected to the first resource.

For example, for a two symbol Type 1DMRS, the first port set may include port 0, port 1, port 4, port 5, and the first resource includes RE0, RE2, RE12, and RE14; the second set of ports includes ports 8 through 15 and the second resource includes RE1, RE3, RE13, and RE15. In this way, the reference signals corresponding to any one of

ports

0, 1, 4 and 5 may be mapped onto

REs

0, 2, 12 and 14, and the reference signals corresponding to any one of ports 8 to 15 may be mapped onto REs 0 to 3 and 12 to 15.

For another example, for a two symbol Type 2DMRS, the first port set may include port 0, port 1, port 6, and port 7, and the first resource includes RE0, RE1, RE12, and RE13; the second set of ports includes ports 12 through 23, and the second resources include REs 2 through 5, and REs 14 through 17. Thus, reference signals corresponding to any one of

ports

0, 1, 6 and 7 may be mapped to

REs

0, 1, 12 and 13, and reference signals corresponding to any one of ports 12 to 23 may be mapped to REs 0 to 5 and 12 to 17.

Alternatively, the transmitting device may generate the first reference signal according to the first sequence and the third sequence; a second reference signal is generated from the second sequence and the fourth sequence. Wherein the third sequence and the fourth sequence may be the base sequence of the reference signal, respectively. The base sequence of the reference signal may be a pseudo-random sequence, for example, a gold sequence, etc.

By the method, when the transmitting device needs to transmit the first reference signal corresponding to the first port set, the first reference signal can be transmitted through the first resource, and when the transmitting device needs to transmit the second reference signal corresponding to the second port set, the second reference signal can be transmitted through the first resource and the second resource. Thus, a greater number of reference signal ports and, in turn, a greater number of transport streams may be supported on limited resources.

Optionally, in a possible implementation, the first port set corresponds to a first reference signal. Specifically, each port in the first port set corresponds to a first reference signal. The second set of ports corresponds to a second reference signal. Specifically, each port in the first port set corresponds to a second reference signal. The first port set includes a first reference signal port number that is less than a second reference signal port number that the second port set includes. That is, the number of ports included in the first port set is smaller than the number of ports included in the second port set. The first port set and the second port set both correspond to the first resource, i.e., the first resource may transmit a reference signal corresponding to a port in the first port set and a reference signal corresponding to a port in the second port set.

For example, in example one of S602, the first set of ports may include port 0 and port 1, and the second set of ports includes ports 4 through 7.

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

By this method, the first resource can simultaneously correspond to different port sets (e.g., CDM groups), and the number of reference signal ports that can be supported by the two port sets corresponding to the first resource is different. In this way, the reference signals corresponding to the two port sets can be mapped to part of the same time-frequency resources, so that the port number corresponding to the time-frequency resources is increased, and further more transmission stream numbers can be supported.

In some possible implementations, before S601, the method further includes:

s603: the transmitting device acquires the first sequence and/or the second sequence.

The first sequence corresponds to the first resource, and 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, and 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 are described below, respectively.

For the first sequence:

wherein the first sequence may be a masking sequence, e.g., an orthogonal masking sequence. The first sequence may belong to a first set of sequences, the sequences in the first set of sequences being in one-to-one correspondence with ports of the first reference signal (i.e., ports in the first set of ports).

In some possible implementations, each sequence in the first set of sequences includes 2 elements, i.e., each sequence in the first set of sequences includes 2 elements. The sequences in the first sequence set may be orthogonal two by two.

The correspondence between sequences in the first set of sequences and ports of the first reference signal is exemplified below.

For example, for a single symbol Type 1DMRS or a single symbol Type 2DMRS, the first set of sequences may include: the ports of the first reference signal may be port 0 and port 1 in CDM group 0, +1} and { +1, -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 2DMRS, the first set of sequences may include: the ports of the at least one first reference signal may be port 4 and port 5 in CDM group 2, { +1, +1} and { +1, -1 }. Port 4 corresponds to the sequence { +1, +1 }; port 5 corresponds to the sequence { +1, -1 }.

In S603, the transmitting device may acquire a first sequence when a reference signal corresponding to a port in the first port set is to be transmitted. For example, when the transmitting device is to transmit a transport stream, a sequence corresponding to the DMRS port (i.e., a first sequence) may be selected 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 defined by a protocol, or may be determined in other manners, which is not limited in the present application.

In S602, the transmitting apparatus may transmit a first reference signal corresponding to the first sequence through steps A1-A2 according to the first sequence. Accordingly, the receiving apparatus receives a first reference signal corresponding to the first sequence from the transmitting apparatus.

A1: the transmitting device maps the first reference signal onto the first resource according to the first sequence.

The transmitting device may multiply the first reference signal corresponding to the first sequence with the first sequence and map the first reference signal to the corresponding time-frequency resource through a preset time-frequency resource mapping rule. The specific mapping method is as described above, and will not be described here again.

For example (hereinafter, simply referred to as example 1), referring to fig. 4, for a single symbol Type 1DMRS, the first sequence is { +1, +1}, { +1, +1} corresponding to port 0 in CDM group 0, and the first 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 into RE0 and RE2.

For another example (hereinafter, simply referred to as example 2), referring to fig. 5, for a single symbol Type 2DMRS, the first sequence is { +1, +1}, { +1, +1} corresponding to port 0 in CDM group 0, and the first resource includes RE0 and RE1. The DMRS corresponding to port 0 is multiplied by { +1, +1} through a preset time-frequency resource mapping rule, and then mapped into RE0 and RE1.

A2: the transmitting device transmits a first reference signal over a first resource. Accordingly, the receiving device receives the first reference signal through the first resource.

When example 1 is employed, the transmitting device may transmit DMRS corresponding to port 0 through RE0 and RE1.

When example 2 is employed, the transmitting device may transmit DMRS corresponding to port 0 through RE0 and RE 2.

For the second sequence:

wherein the second sequence may be a masking sequence, e.g., an orthogonal masking sequence. The second sequences may belong to a second set of sequences, the sequences in the second set of sequences being in one-to-one correspondence with ports of at least one second reference signal (i.e. ports in the second set of ports).

In some possible implementations, each sequence in the second set of sequences contains 4, 6, 8, or 12 elements, i.e., each sequence in the second set of sequences contains 4, 6, 8, or 12 elements (which may also be referred to as a sequence length of 4, 6, 8, or 12, or as a 4-long sequence, 6-long sequence, 8-long sequence, or 12-long sequence). The sequences in the second sequence set may be orthogonal two by two. When the number of elements contained in each sequence in the second sequence set is 4, the second sequence set may contain 4 sequences; when the number of elements contained in each sequence in the second sequence set is 6, the second sequence set may contain 6 sequences; when the number of elements contained in each sequence in the second sequence set is 8, the second sequence set may contain 8 sequences; when the number of elements included in each sequence in the second sequence set is 12, the second sequence set may include 12 sequences.

The second sequence set may be defined by a protocol or may be determined in other manners (for example, the transmitting device is generated according to a formula (e.g., formula (2. A), formula (2. B), formula (4. A), or formula (4. A)) in the following implementation one to implementation seven), which is not limited in this application.

In the present application, the relation of the sequences in the first sequence set to the sequences in the second sequence set may include one of:

relationship one:

Wherein the first subset may comprise half of the sequences in the second set of sequences. For example, when the second set of sequences comprises 6 sequences, the first subset comprises 3 sequences of the second set of sequences.

The implementation manner of the relation one may refer to the implementation manner one below, and will not be described herein.

Relationship II:

The implementation of the second relation may refer to the following implementation two, and will not be described herein.

Relationship III:

any sequence in the first set of sequences is orthogonal to any sequence in the first subset of the second set of sequences, cross-correlation with any sequence outside the first subset of the second set of sequencesThe coefficients are

Wherein the first subset may comprise half of the sequences in the second set of sequences. For example, when the second set of sequences comprises 4 sequences, the first subset comprises 2 sequences of the second set of sequences.

The implementation of the third relation may refer to the following implementation three, which is not described herein.

Relationship four:

The implementation of the fourth relation may refer to the following implementation four, and will not be described here again.

Relationship five:

Wherein the first subset may comprise half of the sequences in the second set of sequences. For example, when the second set of sequences comprises 12 sequences, the first subset comprises 6 sequences of the second set of sequences.

The implementation of the relation five may refer to the following implementation five, which is not described herein.

Relationship six:

The implementation of the relationship six may refer to the following implementation six, and will not be described herein.

Relationship seven:

The implementation of the relation seven may refer to the following implementation seven, and will not be described here again.

In S602, the transmitting apparatus may transmit the second reference signal through steps B1-B2 according to the second sequence. Accordingly, the receiving apparatus receives a second reference signal corresponding to the second sequence from the transmitting apparatus.

B1: the transmitting device maps the second reference signal onto the first resource and the second resource according to the second sequence.

In B1, the transmitting device may multiply the second reference signal corresponding to the second sequence with the second sequence and map the multiplied second reference signal onto the corresponding time-frequency resource according to the time-frequency resource mapping rule in one of the following implementations one to seven. Wherein, each RE of the time-frequency resource block is mapped with a reference signal symbol of a second reference signal. The reference signal symbol is a product of a DMRS reference signal sequence element corresponding to the RE and a corresponding sequence (e.g., second sequence) element at the DMRS port.

For example (hereinafter simply 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 REs 2 to RE5. The DMRS corresponding to the port 12 is multiplied by 6 elements of the second sequence through a time-frequency resource mapping rule in the following implementation one or implementation two, and then mapped into REs 0 to 5.

For another example (hereinafter simply 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 the port 4 is mapped to REs 0 to 4 after being multiplied by 4 elements of the second sequence by a time-frequency resource mapping rule in the following implementation three or implementation four.

For another example (hereinafter simply referred to as example 5), referring to fig. 12, the second sequence includes 12 elements, corresponds to port 12 in CDM group 3, includes RE0 and RE1 for the first resource, and includes RE2 to RE11 for the second resource. The DMRS corresponding to the port 12 is mapped to REs 0 to 11 after being multiplied by 12 elements of the second sequence by a time-frequency resource mapping rule in the following implementation five or implementation six.

B2: the transmitting device transmits a second reference signal through the first resource and the second resource. Correspondingly, the receiving device transmits a second reference signal corresponding to the second sequence through the first resource and the second resource.

When example 3 is employed, the transmitting device may transmit DMRS corresponding to port 12 through REs 0 to 5.

When example 4 is employed, the transmitting device may transmit DMRS corresponding to port 4 through REs 0 to 3.

When example 4 is employed, the transmitting device may transmit DMRS corresponding to port 12 through REs 0 to 11.

In order to multiplex more DMRS ports within the same time-frequency resource, the embodiments of the present application design a set of sequences of length 6 (i.e., a second set of sequences), which contains 6 orthogonal sequences (e.g., orthogonal mask sequences). Each orthogonal sequence contains 6 elements, and each sequence corresponds to a newly added DMRS port. That is, each orthogonal sequence may be used to map its corresponding newly added DMRS port onto a time-frequency resource. Therefore, 6 DMRS ports can be added.

The length-6 sequence and the application thereof according to the embodiment of the present application will be described below by taking the case that the second sequence set includes an orthogonal mask sequence as an example, through implementation one and implementation two, respectively.

The implementation mode is as follows:

each orthogonal mask sequence included in the second sequence set may be one row vector of the matrix b. Wherein, the matrix b is:

or alternatively, the process may be performed,

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

DMRS mask sequences of length 6 generated according to formulas (2. A) and (2. B) are shown in tables 3 and 4, respectively.

TABLE 3 DMRS Port mask sequence of length 6 (corresponding to 2. A)

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

TABLE 4 DMRS Port mask sequence of length 6 (corresponding to 2. B)

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

it should be understood that the tables in this application are only examples, and other expressions may be used, which are not limited in this application. For example, the correspondence between the index in the table and the element may be other correspondence, the correspondence between the sequence index in the table and the row vector corresponding to a certain row in the table may be other correspondence, the correspondence between the sequence index in the table and the mask sequence may be other correspondence, and the elements listed in the table may be some or all of the elements.

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

Table 3 or table 4 includes 6 mask sequences of length 6. Wherein, each mask sequence with length of 6 corresponds to a newly added DMRS port. Accordingly, a total of 6 DMRS ports (which may be referred to herein as newly added ports) may be newly added. One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in fig. 7.

Specifically, one DMRS port corresponds to a mask sequence with length of 6 in table 3 or table 4, and a rule of correspondence between elements included in the mask sequence and REs included in the time-frequency resource block is shown in fig. 7. One mask sequence contains 6 elements corresponding to mask sequence element indices 0 through 5 in table 3 or table 4, respectively, with the digits marked in each RE in fig. 7 representing 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 correspond to 6 subcarriers of the first OFDM symbol, respectively (e.g., correspond to RE0 to RE5, respectively).

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

The multiplexing relationship between the newly added DMRS port and the existing NR Type 2DMRS port in the time-frequency resource blocks of the 6 REs is shown in fig. 8 in combination with the existing NR Type 2DMRS port time-frequency resource mapping rule shown in fig. 5 (see ports corresponding to REs 0 to 5 in fig. 5). The existing NR Type 2DMRS 6 ports are mapped according to the existing protocol time-frequency resource mapping mode, one DMRS port corresponds to a mask sequence with the length of 2, and the mask sequence is mapped on two continuous subcarriers. For the newly added 6 DMRS ports, corresponding to port indexes 12 to 17, different 6 long code mask sequences are adopted to multiplex on all 6 REs.

Taking DMRS port 0 and DMRS port 12 as examples, DMRS port 0 uses a mask sequence with length of 2, and maps on subcarrier 0 and subcarrier 1 (i.e., RE0 and RE 1) corresponding to 1 OFDM symbol. DMRS port 12 maps on subcarriers 0 through 5 (i.e., REs 1 through 5) corresponding to 1 OFDM symbol using a mask sequence of length 6.

In the new length-6 mask sequences shown in table 3 or table 4, any two mask sequences are orthogonal, i.e., the 6 long code mask sequences corresponding to any two ports in the newly added ports are orthogonal. In addition, the mask sequences corresponding to any 1 port in the existing Type 2DMRS ports are orthogonal to 3 mask sequences in the new 6 mask sequences shown in table 3 or table 4, and the cross-correlation coefficient between the mask sequences and any one mask sequence in the remaining 3 mask sequences is

Specifically, when the existing NR Type 2DMRS ports are arranged in the time-frequency resource block formed by the 6 REs according to the mask sequence element index and the time-frequency resource correspondence rule shown in fig. 7, the mask sequence corresponding to the existing NR Type 2DMRS ports may be expressed as:

TABLE 5 NR Type 2DMRS mask sequence

Taking the existing NR Type 2DMRS port 0 as an example, according to the rule shown in fig. 7, the extension of the corresponding DMRS mask sequence to length 6 may be expressed as { +1, 0}. The sequences are orthogonal to the mask sequences of

sequence indexes

0, 2 and 4 in Table 3 or Table 4, and the cross-correlation coefficients of the sequences are the mask sequences of

sequence indexes

1, 3 and 5 in Table 3 or Table 4

Therefore, for the mask sequences corresponding to the newly designed DMRS ports, half of the sequences are orthogonal to the mask sequences corresponding to the existing DMRS ports, and the other half of the sequences keep low cross-correlation properties to the mask sequences corresponding to the existing DMRS ports, so that the quality of channel estimation can be guaranteed to the maximum extent.

A method of mapping DMRS to time-frequency resources according to a mask sequence shown in table 3 or table 4 based on the correspondence rule of fig. 7 is described below.

For port p in the 6 newly added DMRS ports, the mth reference sequence element r (m) in the corresponding reference signal sequence is mapped to index (k, l) according to the following rule _p,μ RE of (c). Wherein the index is (k, l) _p,μ The RE of (2) corresponds to an OFDM symbol with an index of l in a time slot in the time domain, corresponds to a subcarrier with an index of k in the frequency domain, and the mapping rule satisfies:

k＝6n+k′；

k′＝0,1,2,3,4,5；

n＝0,1,...；

l′＝0,1。

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

Is a power scaling factor, w _t (l') OFDM symbol pair with index lTime domain mask element, 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, +.>

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

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

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

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

The implementation method aims at the port of the NR Type 2 single-symbol DMRS to expand capacity. In the same time-frequency resource block, the existing NR Type 2 single-symbol DMRS port and the newly added DMRS port respectively adopt a mask sequence with the length of 2 and a mask sequence with the length of 6. By design, any two of the 6 length-6 masking sequences are orthogonal. Any one of the length-2 masking sequences is orthogonal to half of the length-6 set of masking sequences, ensuring very low cross-correlation with the remaining half. Therefore, the DMRS ports with the semi-orthogonal or low cross-correlation characteristics can be multiplexed under the condition of not increasing time-frequency resources, the double capacity expansion of the DMRS ports is realized, the interference between the original ports and the newly added ports of the protocol is reduced to the maximum extent, and the quality of channel estimation is ensured.

In addition, the newly designed length-6 mask sequence considers the cross-correlation property with the existing NR Type 2 length-2 orthogonal mask sequence. In practical application, the semi-orthogonal and low cross-correlation characteristics between the new sequence and the existing sequence can be fully utilized, and different DMRS ports are allocated to users under different conditions. For example, orthogonal sequences may be allocated to users with greater interference and non-orthogonal sequences with low cross correlation may be allocated to users with less interference, so that channel estimation loss due to non-orthogonal ports may be minimized.

The implementation mode II is as follows:

in implementation two, each orthogonal mask sequence included in the second sequence set may be one row vector of the matrix b.

Wherein, the matrix b is:

or alternatively, the process may be performed,

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

DMRS mask sequences of length 6 generated according to formulas (4. A) and (4. B) are shown in tables 8 and 9, respectively.

TABLE 8 masking sequence of length 6 (corresponding 4. A)

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

TABLE 9 masking sequence of length 6 (corresponding 4. B)

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

in the mask sequences of length 6 shown in table 8 or 9, each mask sequence corresponds to one DMRS port. Therefore, a total of 6 DMRS ports are added (which may be referred to as added ports in this application). One element included in each sequence corresponds to one 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 a rule of correspondence between elements included in the mask sequence and REs included in the time-frequency resource block is shown in fig. 7. One mask sequence contains 6 elements corresponding to mask sequence element indices 0 through 5 in table 8 or 9, respectively, with the digits marked in each RE in fig. 7 representing 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 9 correspond to 6 subcarriers of the first OFDM symbol, respectively (e.g., correspond to RE0 to RE5, respectively). The multiplexing relationship between the newly added DMRS port and the existing NR Type 2 single symbol DMRS port in the time-frequency resource blocks of the 6 REs is shown in fig. 8 in combination with the existing NR Type 2 single symbol DMRS port time-frequency resource mapping rule shown in fig. 5. The existing NR Type 2DMRS single-symbol 6 ports are mapped according to the existing protocol time-frequency resource mapping mode, one DMRS port corresponds to a mask sequence with the length of 2, and the mask sequence is mapped on two continuous subcarriers. For the newly added 6 DMRS ports, corresponding port indexes 12 to 17, different 6 long code mask sequences are adopted to multiplex on all 6 REs.

Taking DMRS port 0 and DMRS port 12 as examples, DMRS port 0 uses a mask sequence with length of 2, and maps on subcarrier 0 and subcarrier 1 (i.e., RE0 and RE 1) corresponding to 1 OFDM symbol. The DMRS port 12 uses a mask sequence with a length of 6, and maps the mask sequence on subcarriers 0 to 5 (i.e., REs 1 to 5) corresponding to 1 OFDM symbol.

Any two mask sequences of length 6 shown in table 8 or 9 are orthogonal, i.e., the mask sequences of length 6 corresponding to any two ports of the newly added ports are orthogonal. In addition, the cross-correlation coefficient between the mask sequence corresponding to any 1 of the existing Type 2DMRS ports and any one of the 6 mask sequences shown in table 8 or 9 is

Specifically, taking the existing NR Type 2DMRS port 0 as an example, if the corresponding DMRS mask sequence is extended to a length 6 according to the rule shown in fig. 7, it may be expressed as { +1, 0}. The cross-correlation coefficient of the sequence with either one of the mask sequences of Table 8 or Table 9 is

Therefore, the mask sequences corresponding to the newly designed DMRS ports keep extremely low cross-correlation characteristics on the mask sequences corresponding to the existing DMRS ports, so that the quality of channel estimation can be ensured to the greatest extent.

A method of mapping DMRS to time-frequency resources according to a mask sequence shown in table 8 or 9 based on the correspondence rule of fig. 7 is described below.

For port p in the 6 newly added DMRS ports, the mth reference sequence element r (m) in the corresponding reference signal sequence is mapped to index (k, l) according to the following rule _p,μ RE of (c). Wherein the index is (k, l) _p,μ RE in one time slot in time domainThe OFDM symbol with index of l corresponds to the subcarrier with index of k on the frequency domain, and the mapping rule satisfies:

k＝6n+k′；

k′＝0,1,2,3,4,5；

n＝0,1,...；

l′＝0,1。

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

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

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 may be determined according to table 11.

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

In the second implementation manner, capacity expansion is performed for ports of the 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 respectively adopt a mask sequence with the length of 2 and a mask sequence with the length of 6. By design, any two of the 6 length-6 masking sequences are orthogonal. Any one of the length-2 mask sequences guarantees very low cross-correlation with any one of the length-6 mask sequence sets. Therefore, the non-orthogonal DMRS ports with low cross-correlation characteristics can be multiplexed to realize one-time capacity expansion of the DMRS ports without increasing time-frequency resources, interference between the original ports and the newly added ports of the protocol is reduced to the maximum extent, and the quality of channel estimation is ensured.

In order to multiplex more DMRS ports within the same time-frequency resource, the embodiments of the present application design a set of sequences of length 4 (i.e., a second set of sequences), which contains 4 orthogonal sequences (e.g., orthogonal mask sequences). Each orthogonal sequence contains 4 elements, and each sequence corresponds to a newly added DMRS port. That is, each orthogonal sequence may be used to map its corresponding newly added DMRS port onto a time-frequency resource. Thus, a new 4 DMRS ports can be implemented.

The sequence with length 4 and its application in the embodiment of the present application are described below by taking the example that the second sequence set includes the orthogonal mask sequence as an example, through the implementation three and the implementation four respectively.

And the implementation mode is three:

each orthogonal mask sequence included in the second sequence set is associated with a matrix b. Wherein, the matrix b is:

or alternatively, the process may be performed,

representing the Kronecker product; b is a matrix of 6*6, wherein each row vector of 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 of the 6 row vectors in matrix b.

In addition, elements included in different orthogonal mask sequences in the second sequence set correspond to the same columns of matrix b. For example, the second sequence set includes sequence 1 to sequence 4, respectively corresponding to row vectors of 1 st to 4 th rows in the matrix b, sequence 1 to sequence 4 respectively including first 4 elements (e.g., table 12 or table 13) in corresponding rows in the matrix b, or sequence 1 to sequence 4 respectively including last 4 elements in corresponding rows in the matrix b, or sequence 1 to sequence 4 respectively including middle 4 elements in corresponding rows in the matrix b, and sequence 1 to sequence 4 respectively including 1 st, 3 rd, 4 th, 5 th elements in corresponding rows in the matrix b.

The present application will be described below by taking the orthogonal mask sequences shown in table 12 or table 13 as an example. It should be understood that other DMRS mask sequences of length 4 generated according to (2. A) and (2. B) may also be implemented in a similar manner, and will not be described here again.

Table 12 DMRS port mask sequence of length 4 (corresponding to 2. A)

As shown in table 12, the 4 orthogonal mask sequences included in the second sequence set are respectively:

TABLE 13 DMRS Port mask sequence of length 4 (corresponding to 2. B)

As shown in table 13, the 4 orthogonal mask sequences included in the second sequence set are respectively:

as shown in table 12 or table 13, the second set of sequences obtained by implementation three may include 4 mask sequences of length 4. Wherein, each mask sequence with length of 4 corresponds to a newly added DMRS port. Therefore, a total of 4 DMRS ports (may be referred to as newly added ports in this application) may be newly added. One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in fig. 9.

Specifically, one DMRS port corresponds to a mask sequence (for example, a mask sequence shown in table 12 or table 13) with a length of 4, and a rule of correspondence between elements included in the mask sequence and REs included in the time-frequency resource block is shown in fig. 9. One mask sequence contains 4 elements corresponding to mask sequence element indices 0 through 3 in table 12 or table 13, respectively, with the digits noted in each RE in fig. 9 representing the indices of the mask sequence elements. Wherein, the mask sequence elements corresponding to the mask sequence element indexes 0 to 3 in table 12 or table 13 correspond to 4 subcarriers of the first OFDM symbol, respectively (for example, correspond to RE0 to RE3, respectively).

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

The multiplexing relationship between the newly added DMRS port and the existing NR Type 1DMRS port in the time-frequency resource blocks of the 4 REs according to the existing NR Type 1DMRS port time-frequency resource mapping rule shown in fig. 10 is shown in fig. 10. The existing NR Type 1DMRS 4 ports are mapped according to the existing protocol time-frequency resource mapping mode, one DMRS port corresponds to a mask sequence with the length of 2, and the mask sequence is mapped on two continuous subcarriers. For the newly added 4 DMRS ports, corresponding port indexes 12-15, different 4 long code mask sequences are adopted to multiplex on all 4 REs.

Taking DMRS port 0 and DMRS port 4 as examples, DMRS port 0 uses a mask sequence with length of 2, and maps on subcarrier 0 and subcarrier 2 (i.e., RE0 and RE 2) corresponding to 1 OFDM symbol. DMRS port 4 adopts a mask sequence with length of 4, and maps on subcarriers 0 to 3 (i.e., REs 1 to 3) corresponding to 1 OFDM symbol.

Of the new length-4 mask sequences shown in table 12 or 14, any two mask sequences are orthogonal, i.e., the 4-long mask sequences corresponding to any two ports of the newly added ports are orthogonal. In addition, the mask sequences corresponding to any 1 port in the existing Type 1DMRS ports are orthogonal to 2 mask sequences in the new 4 mask sequences shown in table 12 or table 13, and the cross-correlation coefficient between the mask sequences and any mask sequence in the remaining 2 mask sequences is

Specifically, when the existing NR Type 1DMRS ports are arranged in the time-frequency resource block formed by the 4 REs according to the mask sequence element index and the time-frequency resource correspondence rule shown in fig. 9, the mask sequence corresponding to the existing NR Type 1DMRS ports may be expressed as:

TABLE 14 existing NR Type 1DMRS mask sequence

Taking the existing NR Type 1DMRS port 0 as an example, according to the rule shown in fig. 9, the extension of the corresponding DMRS mask sequence to length 4 may be expressed as { +1, 0}. The sequences are orthogonal to the mask sequences with

sequence indexes

0 and 2 in table 12 or table 13, and the cross-correlation coefficients of the sequences with the mask sequences with

sequence indexes

1 and 3 in table 12 or table 13 are

A method of mapping DMRS to time-frequency resources according to a mask sequence shown in table 12 or table 13 based on the correspondence rule of fig. 9 is described below.

For port p in the 4 newly added DMRS ports, the mth reference sequence element r (m) in the corresponding reference signal sequence is mapped to index (k, l) according to the following rule _p,μ RE of (c). Wherein the index is (k, l) _p,μ The RE of (2) corresponds to an OFDM symbol with an index of l in a time slot in the time domain, corresponds to a subcarrier with an index of k in the frequency domain, and the mapping rule satisfies:

k＝4n+2k′；

k′＝0,1,2,3；

n＝0,1,...；

l′＝0,1。

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

Symbol index or of a starting OFDM symbol occupied for a DMRS modulation symbolReference is made to the symbol index of the OFDM symbol. Wherein the value of m is related to the configuration type.

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

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

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

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

The implementation method aims at the port of the NR Type 1 single-symbol DMRS to expand capacity. In the same time-frequency resource block, the existing NR Type 1 single-symbol DMRS port and the newly added DMRS port respectively adopt a mask sequence with the length of 2 and a mask sequence with the length of 4. By design, any two of the 4 length-4 mask sequences are orthogonal. Any one of the length-2 masking sequences is orthogonal to a portion (e.g., half) of the length-4 masking sequence set, ensuring very low cross-correlation with the remaining other portion. Therefore, the DMRS ports with the semi-orthogonal or low cross-correlation characteristics can be multiplexed under the condition of not increasing time-frequency resources, the double capacity expansion of the DMRS ports is realized, the interference between the original ports and the newly added ports of the protocol is reduced to the maximum extent, and the quality of channel estimation is ensured.

In addition, the newly designed length-4 mask sequence considers the cross-correlation property with the existing NR Type 1 length-2 orthogonal mask sequence. In practical application, the semi-orthogonal and low cross-correlation characteristics between the new sequence and the existing sequence can be fully utilized, and different DMRS ports are allocated to users under different conditions. For example, orthogonal sequences may be allocated to users with greater interference and non-orthogonal sequences with low cross correlation may be allocated to users with less interference, so that channel estimation loss due to non-orthogonal ports may be minimized.

The implementation mode is four:

or alternatively, the process may be performed,

In addition, elements included in different orthogonal mask sequences in the second sequence set correspond to the same columns of matrix b. For example, the second sequence set includes sequence 1 to sequence 4, respectively corresponding to row vectors of 1 st to 4 th rows in the matrix b, sequence 1 to sequence 4 respectively including first 4 elements (e.g., table 17 or table 18) in corresponding rows in the matrix b, or sequence 1 to sequence 4 respectively including last 4 elements in corresponding rows in the matrix b, or sequence 1 to sequence 4 respectively including middle 4 elements in corresponding rows in the matrix b, and sequence 1 to sequence 4 respectively including 1 st, 3 rd, 4 th, 5 th elements in corresponding rows in the matrix b.

The present application will be described below by taking the orthogonal mask sequences shown in table 17 or table 18 as an example. It should be understood that other DMRS mask sequences of length 4 generated according to (4. A) and (4. B) may also be implemented in a similar manner, and will not be described here again.

Table 17 mask sequence of length 4 (corresponding to 4. A)

As shown in table 17, the 4 orthogonal mask sequences included in the second sequence set are respectively:

{1,-1,-j,-j}，

{1,1,-j,j}，

{1,-1,j,j}，

{1,1,j,-j}。

table 18 mask sequence of length 4 (corresponding to 4. B)

As shown in table 18, the 4 orthogonal mask sequences included in the second sequence set are respectively:

{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 set of sequences obtained by implementation four may include 4 mask sequences of length 4. Wherein, each mask sequence with length of 4 corresponds to one DMRS port. Therefore, a total of 4 DMRS ports are newly added (which may be referred to as newly added ports in this application). One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in fig. 9.

Specifically, one DMRS port corresponds to a mask sequence (for example, a mask sequence shown in table 17 or table 18) with a length of 4, and a rule of correspondence between elements included in the mask sequence and REs included in the time-frequency resource block is shown in fig. 9. One mask sequence contains 4 elements corresponding to mask sequence element indices 0 through 3 in table 17 or table 18, respectively, with the digits noted in each RE in fig. 9 representing the indices of the mask sequence elements. Wherein, the mask sequence elements corresponding to the mask sequence element indexes 0 to 3 in the table 17 or the table 18 correspond to 4 subcarriers of the first OFDM symbol, respectively (for example, correspond to RE0 to RE3, respectively).

The multiplexing relationship between the newly added DMRS port and the existing NR Type 1 single symbol DMRS port in the time-frequency resource blocks of the 4 REs is shown in fig. 10 in combination with the existing NR Type 1 single symbol DMRS port time-frequency resource mapping rule (e.g., the mapping rule between RE0 to RE4 and ports in fig. 4). The 4 ports of the existing NR Type 1DMRS single symbol are mapped according to the existing protocol time-frequency resource mapping mode, and one DMRS port corresponds to a mask sequence with the length of 2 and is mapped on two continuous subcarriers. For the newly added 4 DMRS ports, corresponding port indexes 12 to 15, different 4 long code mask sequences are adopted to multiplex on all 4 REs.

Taking DMRS port 0 and DMRS port 4 as examples, DMRS port 0 uses a mask sequence with length of 2, and maps on subcarrier 0 and subcarrier 2 (i.e., RE0 and RE 2) corresponding to 1 OFDM symbol. The DMRS port 4 adopts a mask sequence with a length of 4, and maps on subcarriers 0 to 3 (namely, REs 1 to RE 3) corresponding to 1 OFDM symbol.

Any two mask sequences of length 4 shown in table 17 or table 18 are orthogonal, i.e., the mask sequences of length 4 corresponding to any two ports of the newly added ports are orthogonal. In addition, the cross-correlation coefficient between the mask sequence corresponding to any 1 port in the existing Type 1DMRS ports and any one mask sequence of the 4 mask sequences shown in table 17 or table 18 is

Specifically, taking the existing NR Type 1DMRS port 0 as an example, if the corresponding DMRS mask sequence is extended to a length of 4 according to the rule shown in fig. 9, it may be expressed as { +1, 0}. The cross-correlation coefficient of the sequence with either the mask sequence of Table 17 or Table 18 is

A method of mapping DMRS to time-frequency resources based on the correspondence rule of fig. 9 will be described below taking a mask sequence shown in table 17 or table 18 as an example.

k＝4n+2k′；

k′＝0,1,2,3；

n＝0,1,...；

l′＝0,1。

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

Is a power scaling factor, w _t (l ') is a time domain mask element corresponding to an OFDM symbol with index of l', w _f (k') is an index ofFrequency domain mask element corresponding to subcarrier of k ', m=2n+k', Δ is subcarrier offset factor, +.>

The value of w (k ', l') corresponding to DMRS port p in the mapping rule corresponds to the mask sequence shown in table 17, and 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 may be determined according to table 20.

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

The fourth implementation mode is to expand capacity for the ports of the 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 respectively adopt a mask sequence with the length of 2 and a mask sequence with the length of 4. By design, any two of the 4 length-4 mask sequences are orthogonal. Any one of the length-2 mask sequences ensures very low cross-correlation with any one of the length-4 set of mask sequences. Therefore, the non-orthogonal DMRS ports with low cross-correlation characteristics can be multiplexed to realize one-time capacity expansion of the DMRS ports without increasing time-frequency resources, interference between the original ports and the newly added ports of the protocol is reduced to the maximum extent, and the quality of channel estimation is ensured.

For more DMRS ports to multiplex the same time-frequency resources, the present application designs a set of mask sequences of length 12 (i.e., a second sequence set), where one mask sequence set contains 12 mask sequences. Each mask sequence contains 12 elements. Each mask sequence corresponds to a newly added DMRS port, so that at least 12 DMRS ports can be added.

The sequence with length 12 and its application according to the embodiment of the present application are described below by taking the example that the second sequence set includes an orthogonal mask sequence as an example, through implementation five and implementation six respectively.

The implementation mode is five:

the second sequence set may contain 12 mask sequences, each of which may contain 12 elements. Representing a mask sequence as a row vector, 12 mask sequences forming a matrix in the form of row vectors

The following relationship may be satisfied:

wherein the method comprises the steps of

Or alternatively, the process may be performed,

or alternatively, the process may be performed,

here, the

Representing the Kronecker product, B is a matrix of 12 x 12, where each row directionQuantity w _k ＝[w _k(0) w _k(1) ...w _k(11) ](k=1, 2, … …, N, positive integer) corresponds to a mask sequence of length 12, and the length represents the number of mask sequence elements. The matrix B corresponds to a second sequence set, wherein 12 mask sequences contained in the second sequence set correspond to 12 row vectors in the matrix B one by one. Any two mask sequences contained in the second sequence set are orthogonal. DMRS mask sequences of length 12 generated according to formulas (8. A), (8. B) and (8.C) are shown in tables 21, 22 and 23, respectively.

It should be understood that the table in the present application is only used as an example and not limited thereto, for example, the correspondence between the index and the element in the table may be other correspondence, the correspondence between the sequence index and the row vector corresponding to a certain row in the table may be other correspondence, the correspondence between the sequence index and the mask sequence in the table may be other correspondence, the elements listed in the table may be some, all, and so on.

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

As shown in table 21, the sequences in the second sequence set may be respectively:

/>

table 22 length 12 mask sequence (based on equation 8. B)

As shown in table 22, the sequences in the second sequence set may be respectively:

/>

table 23 mask sequence of length 12 (based on equation 8.C)

As shown in table 23, the sequences in the second sequence set may be respectively: {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 of length 12 shown in table 21, table 22 or table 23, each mask sequence corresponds to one DMRS port, and thus 12 DMRS ports (hereinafter referred to as newly added ports) are newly added in total. One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in fig. 11.

Specifically, one DMRS port corresponds to a mask sequence of length 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. One mask sequence contains 12 elements, corresponding to mask sequence element indices 0-11, with the digits noted in each RE in FIG. 11 representing the index of the mask sequence element. Wherein the mask sequence elements corresponding to the mask sequence element indexes 0-5 in table 21, table 22 or table 23 respectively correspond to 6 subcarriers of the first OFDM symbol; the mask sequence elements corresponding to the mask sequence element indices 6 to 11 in table 21, table 22 or table 23 correspond to 6 subcarriers of the second OFDM symbol, respectively.

It should be understood that fig. 11 is only an example and not limited to fig. 11, and that fig. 11 may be a partial RE or full RE diagram, that is, subcarriers 0 to 5 may represent any group of resource blocks, and symbols 0 to 1 may be other consecutive 2 OFDM symbols, which is not limited in this application. For example, subcarriers 0 to 5 may be subcarriers with indexes 6q+0 to 6q+5, where q=0, 1,2 … ….

The multiplexing relationship between the newly added DMRS port and the existing NR Type 2DMRS port in the time-frequency resource blocks of the 12 REs according to the existing NR Type 2DMRS port time-frequency resource mapping rule shown in fig. 5 is shown in fig. 12. The existing NR Type 2DMRS 12 ports are mapped according to the existing protocol time-frequency resource mapping mode, one DMRS port corresponds to a mask sequence with the length of 4, and the mask sequence is mapped on two continuous subcarriers. For the newly added 12 DMRS ports, which correspond to port indexes 12 to 23, different 12 long code mask sequences are adopted to multiplex on all 12 REs.

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

Of the new mask sequences of length 12 shown in table 21, table 22 or table 23, any two mask sequences are orthogonal, i.e., the 12 long code mask sequences corresponding to any two ports of the newly added ports are orthogonal. In addition, the mask sequences corresponding to any 1 of the existing Type 2DMRS ports are orthogonal to 6 mask sequences of the new 12 mask sequences shown in table 21, table 22 or table 23, and the cross-correlation coefficient between the mask sequences and any one of the remaining 6 mask sequences is

Specifically, the existing NR Type 2DMRS ports are arranged in the time-frequency resource block formed by the 12 REs according to the mask sequence element index and the time-frequency resource correspondence rule shown in fig. 11, and a mask sequence corresponding to the existing NR Type 2DMRS ports may be expressed as:

Table 24 presents NR Type 2DMRS mask sequences

Illustratively, the existing NR Type 2DMRS port 0, according to the rule shown in FIG. 11, the corresponding DMRS mask sequence length extension to 12 may be expressed as { +1+ 1 0 0 0 0 +1+1+0 00 0}. The sequence is orthogonal to the new mask sequences with sequence indexes of 6-11 in table 21, table 22 or table 23, and the cross-correlation coefficient with the new mask sequences with sequence indexes of 0-5 in table 21, table 22 or table 23 is

Taking the new mask sequence with the sequence index of 0 in table 21 as an example, the cross-correlation coefficient of the DMRS mask sequence corresponding to the existing NR Type 2DMRS port 0 is:

it should be appreciated that the threshold value of the cross-correlation coefficient may be here

Therefore, for the mask sequences corresponding to the newly designed DMRS ports, half of the mask sequences corresponding to the existing DMRS ports are orthogonal, and the other half of the mask sequences corresponding to the existing DMRS ports keep low cross-correlation properties, so that the quality of channel estimation can be guaranteed to the maximum extent.

Taking fig. 11 as an example, the mth element r (m) in the DMRS base sequence corresponding to the port p in the 12 DMRS ports is mapped to the index (k, l) according to the following rule _p,μ RE of (c). Wherein the index is (k, l) _p,μ The RE of (2) corresponds to an OFDM symbol with an index of l in a time slot in the time domain, corresponds to a subcarrier with an index of k in the frequency domain, and the mapping rule satisfies:

p is the index of the DMRS port,

is the symbol index of the starting OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, w _f (k') is an index ofFrequency domain mask sequence element, w, corresponding to subcarrier of k _t (l ') is a time domain mask sequence element corresponding to an OFDM symbol with index l', and c (n) is an element of the block sequence mapped on the kth subcarrier and the ith symbol. Mu represents a subcarrier spacing parameter, ">

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

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

Table 25 New design Length 12 mask sequence mapping rule (corresponding Table 21)

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

Table 26 New design Length 12 mask sequence mapping rule (correspondence Table 22)

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

Table 27 New design Length 12 mask sequence mapping rule (correspondence Table 23)

The values of the block sequence element c (n) may satisfy the following relationship:

wherein N is 2 times of the number of RBs contained in the bandwidth occupied by the DMRS signal in the frequency domain, and v may be a number that is mutually equal to N.

According to the embodiment of the application, capacity expansion is carried out on ports of the NR Type 2DMRS, and in the same time-frequency resource block, the existing NR Type 2DMRS ports and the newly-added DMRS ports respectively adopt mask sequences with the length of 4 and mask sequences with the length of 12. By design, any two of the 12 length 12 mask sequences are orthogonal. Any one of the length-4 masking sequences is orthogonal to half of the set of length-12 masking sequences, ensuring a lower cross-correlation with the remaining other half. Therefore, the double capacity expansion of the DMRS port can be realized under the condition of not increasing time-frequency resources, the interference between the original port and the newly-added port of the protocol is reduced to the maximum extent, and the quality of channel estimation is ensured.

The implementation mode is six:

the second sequence set comprises a matrix of mask sequences in the form of row vectors

The following relationship may be satisfied:

or alternatively, the process may be performed,

here, the

Representing the Kronecker product, B is a matrix of 12 x 12, where each row vector w _k ＝[w _k(0) w _k(1) ...w _k(11) ](k=1, 2, …, N, positive integer) corresponds to a mask sequence of length 12. Any contained in the set of mask sequences BThe two mask sequences are orthogonal. DMRS mask sequences of length 12 generated according to formulas (11. A) and (11. B) are shown in tables 28 and 29, respectively.

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

As shown in table 28, the sequences in the second sequence set may be:

/>

table 29 mask sequence of length 12 (based on equation 11. B)

As shown in table 29, the sequences in the second sequence set may be respectively:

/>

in the new mask sequences of length 12 shown in table 28 or 29, each mask sequence corresponds to one DMRS port, and thus 12 DMRS ports (hereinafter referred to as "newly added ports") are newly added in total. One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in fig. 13.

Specifically, for a DMRS port, a mask sequence of length 12 in the correspondence table 28 or the table 29 is shown in fig. 13, where the mask sequence element index and the rule of correspondence of the time-frequency resource RE are shown. One mask sequence contains 12 elements, corresponding to mask sequence element indices 0-11, with the digits marked in each RE in FIG. 13 representing the index of the mask sequence element. Wherein the mask sequence elements corresponding to the mask

sequence element indexes

0, 2, 4, 6, 8, 10 in table 10 or 11 correspond to the

subcarriers

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

sequence element indexes

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

subcarriers

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

Taking DMRS port 0 and DMRS port 12 as examples, DMRS port 0 adopts a mask sequence with length of 4, and maps on subcarrier 0 and subcarrier 1 corresponding to 2 OFDM symbols. The DMRS port 12 uses a mask sequence with a length of 12, and maps on subcarriers 0 to 5 corresponding to 2 OFDM symbols.

Any two mask sequences of the new mask sequences of length 12 shown in table 28 or table 29 are orthogonal, i.e., the 12 long code mask sequences corresponding to any two ports of the newly added ports are orthogonal. In addition, the cross-correlation coefficient between the mask sequence corresponding to any 1 of the existing Type 2DMRS ports and any one of the new 12 mask sequences shown in table 28 or table 29 is

/>

Specifically, the existing NR Type 2DMRS port 0, according to the rule shown in fig. 13, the extension of the corresponding DMRS mask sequence to length 12 may be expressed as { +1+ 1 0 0 0 0 +1+10 0 0 0}. The cross-correlation coefficient of this sequence with either the new mask sequence in Table 28 or Table 29 is

Therefore, for the mask sequences corresponding to the newly designed DMRS ports, the mask sequences corresponding to the existing DMRS ports keep extremely low cross-correlation characteristics, so that the quality of channel estimation can be ensured to the greatest extent.

Taking fig. 13 as an example, the mth element r (m) in the DMRS sequence corresponding to the port p in the 12 DMRS ports is mapped to the index (k, l) according to the following rule _p,μ Resource elements RE of (a). Wherein the index is (k, l) _p,μ The RE of (2) corresponds to an OFDM symbol with an index of l in a time slot in the time domain, corresponds to a subcarrier with an index of k in the frequency domain, and the mapping rule satisfies:

p is the index of the DMRS port,

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

Is a power scaling factor.

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

Table 30 New design Length 12 mask sequence mapping rules (correspondence Table 28)

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

Table 31 New design Length 12 mask sequence mapping rule (correspondence Table 29)

In the port capacity expansion method for the NR Type2DMRS, in the same time-frequency resource block, the existing NR Type2DMRS port and the newly added DMRS port respectively adopt a mask sequence with the length of 4 and a mask sequence with the length of 12. By design, any two of the 12 length 12 mask sequences are orthogonal. Any one of the length-4 mask sequences ensures very low cross-correlation with any one of the length-12 set of mask sequences. Therefore, the double capacity expansion of the DMRS port can be realized under the condition of not increasing time-frequency resources, the interference between the original port and the newly-added port of the protocol is reduced to the maximum extent, and the quality of channel estimation is ensured.

For more DMRS ports to multiplex the same time-frequency resources, the present application designs a set of masking sequences of length 8 (i.e., a second sequence set), where one masking sequence set contains 8 masking sequences. Each mask sequence contains 8 elements. Each mask sequence corresponds to a newly added DMRS port, so that at least 8 DMRS ports can be added.

Taking the case that the second sequence set includes an orthogonal mask sequence as an example, a sequence with a length of 8 and an application thereof according to the embodiment of the present application are described in implementation seven.

Implementation seven

In order to multiplex more DMRS ports in the same time-frequency resource and ensure that the newly added DMRS port does not affect the channel estimation performance of the existing DMRS port, the existing port and the newly added port can be multiplexed in a frequency division manner. For example, for Type 2DMRS,12 DMRS ports are divided into 3 CDM groups. Within the consecutive 6 subcarriers, 2 OFDM symbols, are divided into 3 time-frequency resource sub-blocks, each time-frequency resource sub-block containing the consecutive 2 subcarriers and 2 OFDM symbols. In one implementation, one time-frequency resource sub-block corresponds to one CDM group. As shown in fig. 5, DMRS signals corresponding to 4 DMRS ports included in each CDM group are mapped on 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 of the 3 CDM groups, the existing ports occupy one of the 3 time-frequency resource sub-blocks, and the newly added ports may occupy the remaining 2 of the 3 time-frequency resource sub-blocks. As shown in fig. 14, the conventional ports 0 to 3 correspond to CDM group 0, and are mapped on 4 REs corresponding to consecutive 2 subcarriers (subcarrier 0 and subcarrier 1) and consecutive 2 OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 4. To ensure compatibility, existing ports 0-3 may be allocated to existing devices (existing devices cannot learn the newly added port and do not have the detection capability of the newly added port). The newly added ports 4 to 19 correspond to CDM group 1, and are mapped on 8 REs corresponding to 4 consecutive subcarriers (subcarrier 2, subcarrier 3, subcarrier 4, subcarrier 5) and 2 consecutive OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 8. The newly added ports 4 to 19 can be allocated to new devices (the newly added ports can be known and have the detection capability of the newly added ports).

In another implementation, the existing ports are mapped on 4 REs corresponding to consecutive 2 subcarriers (subcarrier 4 and subcarrier 5) and consecutive 2 OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 4. To ensure compatibility, existing ports may be allocated to existing devices (existing devices cannot learn the newly added ports and do not have the detection capability of the newly added ports). The newly added port is mapped on 8 REs corresponding to 4 consecutive subcarriers (subcarrier 0, subcarrier 1, subcarrier 2, subcarrier 3) and 2 consecutive OFDM symbols (symbol 0 and symbol 1) based on an orthogonal mask sequence of length 8. The newly added port can be allocated to a new device (the newly added port can be known and has the detection capability of the newly added port).

In another implementation, the existing DMRS ports belong to 8 DMRS ports included in 2 CDM groups of the 3 CDM groups, the existing ports may occupy 2 sub-blocks of the 3 time-frequency resource sub-blocks, and the newly added ports may occupy the remaining 1 sub-block of the 3 time-frequency resource sub-blocks. Specifically, the existing DMRS ports occupy CDM group 0 and CDM group 1, i.e., the existing DMRS ports are mapped on consecutive 4 subcarriers (subcarrier 0, subcarrier 1, subcarrier 2, subcarrier 3). The newly added DMRS port occupies CDM group 2, i.e., the existing DMRS port is mapped on 2 consecutive subcarriers (subcarrier 4, subcarrier 5). Or the existing DMRS ports occupy CDM group 1 and CDM group 2, i.e., the existing DMRS ports are mapped on consecutive 4 subcarriers (subcarrier 2, subcarrier 3, subcarrier 4, subcarrier 5). The newly added DMRS port occupies CDM group 0, i.e., the existing DMRS port is mapped on 2 consecutive subcarriers (subcarrier 0, subcarrier 1).

Taking the case that the existing DMRS port belongs to 4 DMRS ports contained in 1 CDM group of 3 CDM groups, the existing port occupies one sub-block of 3 time-frequency resource sub-blocks, and the newly added port can occupy the remaining 2 sub-blocks of 3 time-frequency resource sub-blocks as an example, a plurality of mask sequence sets with the length of 8 can be designed, wherein one mask sequence set contains 8 mask sequences. Each mask sequence corresponds to a newly added DMRS port.

Taking 2 mask sequence sets with length of 8 as an example, a new 8 DMRS ports can be implemented. Taking 3 mask sequence sets with length of 8 as an example, a new 16 DMRS ports can be implemented.

The set of length 8 mask sequences illustratively includes orthogonal mask sequences as shown in tables 32-34.

Table 32 length 8 mask sequence set 1

Table 33 length 8 mask sequence set 2

Set 3 of mask sequences of length 8 of table 34

Each mask sequence in the new set of mask sequences of length 8 shown in tables 32 to 34 corresponds to one DMRS port (hereinafter referred to as an added port). One element included in each sequence corresponds to one RE included in the time-frequency resource block shown in fig. 15.

Specifically, for one DMRS port, a mask sequence with length of 8 in tables 14 to 16 is corresponding, and the mask sequence element index and the rule of correspondence of the time-frequency resource RE are shown in fig. 14. Wherein the mask sequence elements corresponding to the mask sequence element indexes 0-3 in tables 14-16 respectively correspond to 4 subcarriers of the first OFDM symbol; the mask sequence elements corresponding to the mask sequence element indices 4-7 in tables 14-16 correspond to the 4 subcarriers of the second OFDM symbol, respectively.

It should be understood that fig. 14 is an example and not limited to fig. 14, and the mask sequence elements may also follow other mapping rules, for example, 8 elements included in a sequence with a length of 8 may be mapped on subcarriers 0 to 3, and 4 elements included in a sequence with a length of 4 corresponding to an existing port may be mapped on subcarriers 4 to 5, which is not limited in this application.

DMRS ports corresponding to a mask sequence of length 8 (newly designed mask sequence) and DMRS ports corresponding to a mask sequence of length 4 (existing mask sequence of NR length 4) are mapped in a time-frequency resource block of 12 REs in a frequency-division multiplexing manner. Taking an example of adding 8 DMRS ports to 2 mask sequence sets with length of 8, the correspondence between DMRS ports and REs included in the mask sequence sets and the time resource blocks is shown in fig. 14. For 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 respectively correspond to mask sequences with the existing NR length of 4. For 8 REs formed by subcarriers 2 to 5 corresponding to OFDM symbol 0 and symbol 1, mapping DMRS symbols corresponding to 16 DMRS ports, and corresponding port indexes 4 to 19, and multiplexing all 8 REs by adopting different 8 long code mask sequences.

Taking DMRS port 0 and DMRS port 4 as examples, DMRS port 0 adopts a mask sequence with length of 4, and maps on subcarrier 0 and subcarrier 1 corresponding to 2 OFDM symbols. The DMRS port 4 adopts a mask sequence with a length of 8, and maps on the subcarriers 2 to 5 corresponding to 2 OFDM symbols.

Of the three sets of length 8 mask sequences shown in tables 32-34, any two mask sequences of each set of mask sequences are orthogonal. In addition, if one mask sequence is selected from any two mask sequence sets, the cross-correlation coefficient between the two mask sequences is

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

Taking fig. 14 as an example, port p in 20 DMRS ports, the mth r (m) in the corresponding DMRS sequence is mapped to index (k, l) according to the following rule _p,μ RE of (c). Wherein the index is (k, l) _p,μ The RE of (2) corresponds to an OFDM symbol with an index of l in a time slot in the time domain, corresponds to a subcarrier with an index of k in the frequency domain, and the mapping rule satisfies:

p is the index of the DMRS port,

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

Is a power scaling factor.

The values of w (k ', l') corresponding to DMRS port p can be determined from table 35 corresponding to the mask sequences shown in tables 32 and 33.

Table 35 New design mask sequence mapping rules (mapping tables 32 and 33)

In the port capacity expansion method for the NR Type 2DMRS, 6 subcarriers are divided into 2 time-frequency resource subgroups in a frequency division mode in the same time-frequency resource block, one subgroup comprises 4 REs, and the other subgroup comprises the rest 8 REs. For a subgroup containing 4 REs, 4 DMRS ports are mapped using a mask sequence of length 4. For a subgroup containing 8 REs, 16 DMRS ports are mapped with 2 sets of mask sequences of length 8, or 24 DMRS ports are mapped with 3 sets of mask sequences of length 8. By design, any two sequences in each set of length 8 mask sequences are orthogonal. Extremely low cross-correlation is ensured between any two length 8 mask sequences belonging to different groups. Therefore, under the condition of not increasing time-frequency resources, 0.6 times or 1.3 times capacity expansion of the DMRS ports can be realized while the compatibility with the existing DMRS ports is ensured, interference between newly added ports is reduced to the greatest extent, and the quality of channel estimation is ensured.

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

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

Wherein the communication unit 1101 may be implemented by a transceiver, e.g. a mobile communication module. 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), etc. 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 perform the processing actions in the method embodiments described above. The processing unit 1102 may be implemented by a processor. For example, the processor may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

In one implementation, the communication apparatus 1100 is applied to the transmitting device in the embodiment shown in fig. 6. The specific functions of the processing unit 1102 in this embodiment will be described below.

The processing unit 1102 is configured to send indication information through the communication unit 1101; the indication information is used for indicating that the 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 the first resource and a second resource; the first resource and the second resource are located on the same time domain resource.

Optionally, the first port set corresponds to a first reference signal, and the second port set corresponds to a second reference signal; the first port set includes a first reference signal port number that is less than a second reference signal port number that the second port set includes.

Optionally, the processing unit 1102 is configured to: acquiring a first sequence; the elements in the first sequence are in one-to-one correspondence with resource elements RE in the first resource; and/or, obtaining a second sequence; the elements in the second sequence are in one-to-one correspondence with 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 sequences in the first sequence set are in one-to-one correspondence with at least one first reference signal; the second sequences belong to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one by one; any one of the first set of sequences and a first subset of the second set of sequencesAny sequence is orthogonal, and the cross-correlation coefficient of any sequence outside the first subset in the second sequence set is

Or->

Alternatively, the cross-correlation coefficient of any one of the first set of sequences with any one of the second set of sequences 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 in pairs; the sequences in the second sequence set are orthogonal in pairs.

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

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 the matrix b; alternatively, 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 one row vector in the matrix b.

Wherein the matrix b satisfies one of the following formulas:

in one implementation, 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 described below.

A processing unit 1102 for receiving the instruction information through the communication unit 1101; the indication information is used for indicating that the 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 the first resource and a 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 REs in the first resource; elements in the second sequence are in one-to-one correspondence with 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 sequences in the first sequence set are in one-to-one correspondence with at least one first reference signal; the second sequences belong to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one by one; any one of the first set of sequences is orthogonal to any one of the first subset of the second set of sequences, and is mutually orthogonal to any one of the sequences outside the first subset of the second set of sequences The correlation coefficient is

Or->

Or->

Wherein the matrix b satisfies one of the following formulas:

it should be noted that, in the above embodiments of the present application, the division of the modules is merely schematic, and there may be another division manner in actual implementation, and in addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or may exist separately and physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Based on the same technical concept, the embodiment of the present application provides a communication device through the illustration of fig. 17, which can be used to perform the steps related to the above-mentioned method embodiment. The communication device may be applied to a network device or a terminal device in the communication system shown in fig. 1, and may implement the communication method provided in the embodiments and examples of the present application, and have the function of the communication apparatus shown in fig. 16. Referring to fig. 17, the communication apparatus 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 interconnected.

Optionally, the communication module 1201, the processor 1202 and the memory 1203 are connected to each other by 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 buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 17, but not only one bus or one type of bus.

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

The processor 1202 may be configured to support the communications device 1200 in performing the processing actions described above in the method embodiments. The processor 1202 may also be adapted to carry out the functions of the processing unit 1102 described above when the communication device 1200 is adapted to carry out the method embodiments described above. The processor 1202 may be a CPU, but may also be other general purpose processors, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

In one implementation, the communication device 1200 is applied to the transmitting device in the embodiment of the present application shown in fig. 6. The processor 1202 is specifically configured to:

transmitting indication information through the communication module 1201; the indication information is used for indicating that the 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 the first resource and a second resource; the first resource and the second resource are located on the same time domain resource.

In one implementation, the communication device 1200 is applied to a receiving device in the embodiment of the present application shown in fig. 6. The processor 1202 is specifically configured to:

receiving indication information through the communication module 1201; the indication information is used for indicating that the port belongs to a first port set or a second port set;

The specific function of the processor 1202 may refer to the description in the communication method provided in the embodiments and examples of the present application, and the specific function description of the communication device 1100 in the embodiments of the present application shown in fig. 16 is not repeated herein.

The memory 1203 is configured to store program instructions, data, and the like. In particular, the program instructions may comprise program code comprising computer-operating instructions. The memory 1203 may include RAM, and may also include non-volatile memory (such as at least one 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-described functions, thereby implementing the communication method provided in the embodiment of the present application.

It is to be appreciated that memory 1203 in fig. 17 of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a ROM, a Programmable ROM (PROM), an Erasable Programmable EPROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be RAM, which acts as external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Based on the above embodiments, the present application further provides a computer program, which when run on a computer causes the computer to perform the method provided by the above embodiments.

Based on the above embodiments, the present application further provides a computer-readable storage medium having stored therein a computer program, which when executed by a computer, causes the computer to perform the method provided in the above embodiments.

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

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

Based on the above embodiments, the embodiments of the present application provide a chip system, which includes a processor for supporting a computer apparatus to implement the functions related to each device in the above embodiments. In one possible design, the chip system further includes a memory for storing programs and data necessary for the computer device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

In summary, the embodiments of the present application provide a communication method, device, and equipment, where the method is: the transmitting device may transmit indication information for indicating that the port belongs to the first port set or the second port set. 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 transmitting device needs to transmit the first reference signal corresponding to the first port set, the first reference signal can be transmitted through the first resource, and when the transmitting device needs to transmit the second reference signal corresponding to the second port set, the second reference signal can be transmitted through the first resource and the second resource. By the method, more reference signal ports can be supported on limited resources, and further more transmission stream numbers can be supported.

In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

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

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

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

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

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

Claims

1. A method of communication, comprising:

transmitting indication information; the indication information is used for indicating that the port belongs to a first port set or a second port set;

2. The method of claim 1, wherein,

the first port set corresponds to a first reference signal, and the second port set corresponds to a second reference signal;

the first port set includes a first reference signal port number that is less than a second reference signal port number that the second port set includes.

3. The method of claim 1 or 2, wherein the method further comprises:

acquiring a first sequence; the elements in the first sequence are in one-to-one correspondence with resource elements RE in the first resource; and/or

Acquiring a second sequence; the elements in the second sequence are in one-to-one correspondence with 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.

4. The method of claim 3, wherein,

the first sequences belong to a first sequence set, and sequences in the first sequence set correspond to at least one first reference signal one by one;

the second sequences belong to a second sequence set, and sequences in the second sequence set correspond to at least one second reference signal one by one;

any sequence in the first sequence set is orthogonal to any sequence in the first subset of the second sequence set, and the cross-correlation coefficient with any sequence outside the first subset of the second sequence set is

Or->

Or->

5. The method of claim 4, wherein the sequences in the first set of sequences comprise a number of elements of 2 and the sequences in the second set of sequences comprise a number of elements of 4 or 6.

6. The method of claim 4 or 5, wherein,

sequences in the first sequence set are orthogonal in pairs;

the sequences in the second sequence set are orthogonal in pairs.

7. The method of any of claims 4 to 6, wherein the first subset comprises half of the sequences in the second set of sequences.

8. The method according to any one of claim 4 to 7,

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 a matrix b; or alternatively, the process may be performed,

when the number of elements included in the sequences in the second sequence set is 4, each sequence in the second sequence set contains 4 elements in one row vector in the matrix b;

wherein the matrix b satisfies one of the following formulas:

9. a method of communication, comprising:

receiving indication information; the indication information is used for indicating that the port belongs to a first port set or a second port set;

10. The method of claim 9, wherein,

11. The method of claim 9 or 10, wherein,

the elements in the first sequence are in one-to-one correspondence with resource elements RE in the first resource;

elements in the second sequence are in one-to-one correspondence with REs in the first resource and the second resource;

12. The method of claim 11, wherein,

Or->

Or->

13. The method of claim 12, wherein the sequences in the first set of sequences comprise a number of elements of 2 and the sequences in the second set of sequences comprise a number of elements of 4 or 6.

14. The method of claim 12 or 13, wherein,

sequences in the first sequence set are orthogonal in pairs;

the sequences in the second sequence set are orthogonal in pairs.

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

16. The method according to any one of claim 12 to 15, wherein,

wherein the matrix b satisfies one of the following formulas:

17. a communication device, comprising:

a communication unit for receiving and transmitting data;

a processing unit for performing the method of any of claims 1-16 by means of the communication unit.

18. A communication system, comprising:

transmitting device for implementing the method according to any of claims 1-8;

Receiving device for implementing the method according to any of claims 9-16.

19. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when run on a computer, causes the computer to perform the method of any of claims 1-16.

20. A chip, characterized in that the chip is coupled to a memory, the chip reading a computer program stored in the memory, performing the method of any of claims 1-16.