WO2024032261A1

WO2024032261A1 - Sequence generation method and communication apparatus

Info

Publication number: WO2024032261A1
Application number: PCT/CN2023/104985
Authority: WO
Inventors: 董昶钊; 高翔; 龚名新; 刘鹍鹏
Original assignee: 华为技术有限公司
Priority date: 2022-08-12
Filing date: 2023-06-30
Publication date: 2024-02-15
Also published as: CN117640294A

Abstract

Provided are a sequence generation method and a communication apparatus, which relate to the technical field of wireless communications, and can generate a reference signal sequence having a low peak-to-average power ratio (PAPR) effect The method comprises: a communication device determining an initialization factor for a first sequence according to a first parameter, and then generating the first sequence according to the initialization factor, wherein the first parameter is a port index, or the first parameter is a CDM group identifier, and the first sequence is used for generating a reference signal.

Description

Sequence generation method and communication device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 12, 2022, with application number 202210968861.3 and application name "Sequence Generation Method and Communication Device", the entire content of which is incorporated into this application by reference. .

Technical field

The present application relates to the field of wireless communications, and in particular, to a sequence generation method and a communication device.

Background technique

The demodulation reference signal (DMRS) is used by the receiving device for equivalent channel estimation. For two reference signals mapped to adjacent frequency domain units, the scrambling factors corresponding to the two reference signals Different to achieve the effect of low peak to average power ratio (PAPR). Among them, the scrambling factor It is related to the index of a code division multiplexing (code division multiplexing, CDM) group, and the value of the index of the CDM group is one of fixed values.

However, if the number of transmission streams increases, the number of reference signal ports increases, the number of CDM groups increases, and the index value of the CDM group also changes and is no longer limited to the above fixed value. In this case, how to generate a reference signal sequence with low PAPR effect is an urgent problem to be solved.

Contents of the invention

The present application provides a sequence generation method and a communication device that can generate a reference signal sequence with a low PAPR effect, so that the reference signals at adjacent frequency domain positions have a low PAPR effect. In order to achieve the above purpose, this application adopts the following technical solutions:

The first aspect provides a sequence generation method. The execution subject of the method may be a communication device or a chip applied in the communication device. The following description takes the execution subject being a communication device as an example. The method includes:

The communication device determines an initialization factor of the first sequence according to the first parameter, and then the communication device generates the first sequence according to the initialization factor. Among them, the initialization factor of the first sequence satisfies:

Among them, c _init represents the initialization factor of the first sequence, Indicates the number of orthogonal frequency division multiplexing OFDM symbols in a time slot, represents the time slot index within a system frame, l represents the index of OFDM symbol, Represents the sequence scrambling code identifier, Represents scrambling factor, scrambling factor satisfy:

Among them, λ represents the first parameter, Represents the value of the first parameter, k represents a positive integer, k≥2.

That is to say, the scrambling factor corresponding to the first parameter with consecutive values Not the same either. The first parameter can be a CDM group identifier or a port index. In this way, the first parameters corresponding to the CDM groups at adjacent frequency domain positions are continuous. Even if the first parameter has more possible values, the communication device can determine the scrambling factor based on the first parameter. Moreover, the scrambling factors corresponding to different CDM groups in adjacent frequency domain positions Different, it can also make the reference signal in the adjacent frequency domain position have a low PAPR effect.

In one possible design, the sequence scrambling code identifies satisfy:

in, expressed in In the case, the sequence scrambling code identifies value; expressed in In the case, the sequence scrambling code identifies value to be compatible with existing protocols.

In one possible design, the first parameter is the port index. In this way, even if the number of transmission streams increases, the reference signal port index increases, and the A parameter can also indicate a different port index, so that the communication device generates different initialization factors based on the first parameter.

In a possible design, the method further includes: the communication device receives the first signaling. Wherein, the first signaling indicates the first parameter. That is to say, the value of the first parameter may be dynamically indicated to improve the flexibility of the first parameter configuration.

In a possible design, the first parameter is the CDM group identifier. In this way, even if the number of transmission streams increases and the CDM group increases, the first parameter can indicate different CDM group identifiers, so that the communication device generates different initialization factors based on the first parameter.

In one possible design, the first parameter satisfies:
_0≤λ≤Nλ -1

Among them, λ is an integer, and N _λ represents the number of code division multiplexing CDM groups.

In other words, the first parameter is no longer limited to the fixed value 0/1/2, but can have more possible values. Even if the number of CDM groups increases, the first parameter can indicate different CDM group identifiers in multiple CDM groups.

In a possible design, the method further includes: the communication device receives the second signaling. The second signaling indicates the value of n _SCID . That is to say, the value of n _SCID can be dynamically indicated to improve the flexibility of parameter n _SCID configuration.

In a possible design, the method further includes: the communication device generates a first reference signal according to the first sequence, and then the communication device sends the first reference signal. That is, the communication device can transmit a reference signal with a low PAPR effect.

In a possible design, the method further includes: the communication device receives a second reference signal, and then the communication device processes the second reference signal according to the first sequence. That is, the communication device can receive and process the reference signal with low PAPR effect.

In the second aspect, a sequence generation method is provided. The execution subject of the method may be a communication device or a chip applied in the communication device. The following description takes the execution subject being a communication device as an example. The method includes:

Among them, λ represents the first parameter, Represents the value of the first parameter, a represents an integer, a≠0.

That is to say, if the value of the first parameter is different, the scrambling factor Not the same either. The first parameter can be a CDM group identifier or a port index. In this way, the first parameter corresponding to different CDM groups is different. When the first parameter is the CDM group identifier, the value of the first parameter is no longer limited to 0/1/2. When the first parameter is the port index In the case of , the first parameter can indicate more port indexes. Even if the first parameter has more possible values, the communication device can determine the scrambling factor based on the first parameter Moreover, the scrambling factors corresponding to different CDM groups Different, so that the reference signal at the adjacent frequency domain position can achieve the effect of low PAPR.

In one possible design, the sequence scrambling code identifies satisfy:

in, Indicates sequence scrambling code identification The candidate values of i=0,1,…,k-1. Represents the scrambling factor. k represents the number of candidate values for the sequence scrambling code identifier, k≥2.

In one possible design, the sequence scrambling code identifies satisfy:

in, Indicates sequence scrambling code identification Candidate values of i=0,1,…,k-1; λ represents the first parameter, represents the value of the first parameter; k represents the number of candidate values for the sequence scrambling code identifier, k≥2.

In one possible design, the first parameter is the port index.

In a possible design, the first parameter is the CDM group identifier.

In one possible design, the first parameter satisfies:
_0≤λ≤Nλ -1

Among them, λ is an integer, and N _λ represents the number of code division multiplexing CDM groups. In a possible design, the method further includes: the communication device receives the second signaling. The second signaling indicates the value of n _SCID .

In a possible design, the method further includes: the communication device generates a first reference signal according to the first sequence, and then the communication device sends the first reference signal.

In a possible design, the method further includes: the communication device receives a second reference signal, and then the communication device processes the second reference signal according to the first sequence.

In a third aspect, a communication device is provided. The communication device may be the communication device in the above-mentioned second aspect or any possible design of the second aspect, or a chip that implements the functions of the above-mentioned communication device; the communication device includes a device that implements the above-mentioned communication device. The module, unit, or means (means) corresponding to the method can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

The communication device includes a processing unit, a sending unit and a receiving unit. Wherein, the processing unit is used to determine the initialization factor of the first sequence according to the first parameter, and the initialization factor of the first sequence satisfies:

The processing unit is also used to generate the first sequence according to the initialization factor.

In one possible design, the sequence scrambling code identifies satisfy:

In one possible design, the first parameter is the port index.

In a possible design, the receiving unit is also used to receive the first signaling. Wherein, the first signaling indicates the first parameter.

In a possible design, the first parameter is the CDM group identifier.

In one possible design, the first parameter satisfies:
_0≤λ≤Nλ -1

In a possible design, the receiving unit is also used to receive the second signaling. The second signaling indicates the value of n _SCID .

In a possible design, the processing unit is also configured to generate a first reference signal according to the first sequence. A sending unit, configured to send a first reference signal.

In a possible design, the receiving unit is configured to receive the second reference signal. The processing unit is also configured to process the second reference signal according to the first sequence.

In a fourth aspect, a communication device is provided. The communication device may be a communication device in the above-mentioned first aspect or any possible design of the first aspect, or a chip that implements the functions of the above-mentioned communication device; the communication device includes a device that implements the above-mentioned communication device. The module, unit, or means (means) corresponding to the method can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In one possible design, the sequence scrambling code identifies satisfy:

In one possible design, the first parameter is the port index.

In a possible design, the receiving unit is configured to receive the first signaling. Wherein, the first signaling indicates the first parameter.

In a possible design, the first parameter is the CDM group identifier.

In one possible design, the first parameter satisfies:
_0≤λ≤Nλ -1

In a possible design, the processing unit is configured to generate a first reference signal according to the first sequence. A sending unit, configured to send a first reference signal.

In a possible design, the receiving unit is configured to receive the second reference signal. A processing unit configured to process the second reference signal according to the first sequence.

In a fifth aspect, a communication device is provided. The communication device includes: a processor; the processor is coupled to a memory, and is used to read instructions in the memory and execute them, so that the communication device performs any of the above aspects or any possible design of any aspect. The method performed by the communication device. The communication device may be a communication device in the above-mentioned first aspect or any possible design of the first aspect, or the communication device may be a communication device in the above-mentioned second aspect or any possible design of the second aspect, or A chip that implements the functions of the above communication equipment.

A sixth aspect provides a chip. The chip includes processing circuits and input and output interfaces. The input and output interface is used to communicate with a module outside the chip. For example, the chip may be a chip that implements the communication device function in the first aspect or any possible design of the first aspect. The processing circuit is used to run computer programs or instructions to implement the method in the above first aspect or any possible design of the first aspect. For another example, the chip may be a chip that implements the communication device function in the above second aspect or any possible design of the second aspect. The processing circuit is used to run computer programs or instructions to implement the above second aspect or any method in the possible design of the second aspect.

In a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions, which when run on a computer, enable the computer to perform any of the methods in any of the above aspects.

An eighth aspect provides a computer program product containing instructions that, when run on a computer, enable the computer to perform any of the methods of any of the above aspects.

A ninth aspect provides a circuit system. The circuitry includes processing circuitry configured to perform a method as in any one of the above aspects.

Among them, the technical effects brought about by any design in the third aspect to the ninth aspect can be referred to the beneficial effects in the corresponding methods provided above, and will not be described again here.

Description of drawings

Figure 1 is a schematic architectural diagram of a communication system provided by an embodiment of the present application;

Figure 2 is an example of mapping rules provided by the embodiment of the present application;

Figure 3 is Figure 2 of an example of mapping rules provided by the embodiment of the present application;

Figure 4 is Figure 3 of an example of mapping rules provided by the embodiment of this application;

Figure 5 is Figure 4 of an example of mapping rules provided by the embodiment of this application;

Figure 6 is Figure 5 of an example of mapping rules provided by the embodiment of this application;

Figure 7 is Figure 6 of an example of mapping rules provided by the embodiment of this application;

Figure 8 is Figure 7, an example of mapping rules provided by the embodiment of this application;

Figure 9 is an example of mapping rules provided by the embodiment of the present application;

Figure 10 is a schematic flow chart of a communication method provided by an embodiment of the present application;

Figure 11 is a schematic flow chart of yet another communication method provided by an embodiment of the present application;

Figure 12 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Figure 13 is a schematic structural diagram of yet another communication device provided by an embodiment of the present application.

Detailed ways

The terms “first” and “second” in the description of this application and the drawings are used to distinguish different objects, or to distinguish different processes on the same object, rather than to describe a specific order of objects. Furthermore, references to the terms "including" and "having" and any variations thereof in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes other unlisted steps or units, or optionally also Includes other steps or units that are inherent to such processes, methods, products, or devices. It should be understood that in the embodiments of this application, “exemplary” or The words "such as" are used to express examples, illustrations or illustrations. Any embodiment or design described as "exemplary" or "such as" in the embodiments of the application is not to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the words "exemplary" or "such as" is intended to present the concept in a concrete manner. In the embodiment of this application, two or more includes two itself. Multiple can include two, three, or more.

FIG. 1 is a schematic architectural diagram of a communication system 1000 applied in an embodiment of the present application. As shown in Figure 1, the communication system 1000 includes at least one network device (110a and 110b in Figure 1) and at least one terminal device (120a-120j in Figure 1). The terminal device is connected to the network device through wireless means. Figure 1 is only a schematic diagram. The communication system may also include other network equipment, such as wireless relay equipment and wireless backhaul equipment, which are not shown in Figure 1 .

The network equipment can be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a transmission reception point (TRP), or a next-generation base station (next) in the fifth generation (5th generation, 5G) mobile communication system. generation NodeB, gNB), the next generation base station in the sixth generation (6th generation, 6G) mobile communication system, the base station in the future mobile communication system or the access node in the wireless fidelity (wireless fidelity, WiFi) system, etc.; also It can be a module or unit that completes some functions of the base station. For example, it can be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU). The CU here completes the functions of the base station’s radio resource control (RRC) protocol and packet data convergence protocol (PDCP), and can also complete the service data adaptation protocol (SDAP) Function; DU completes the functions of the radio link control (RLC) layer and medium access control (MAC) layer of the base station, and can also complete the functions of part or all of the physical layer. Regarding the above For a detailed description of the protocol layer, please refer to the relevant technical specifications of the 3rd generation partnership project (3GPP). The network device may be a macro base station (110a in Figure 1), a micro base station or an indoor station (110b in Figure 1), or a relay node or a donor node, etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the network equipment. For the convenience of description, the following description takes a network device as an example.

Terminal equipment can also be called terminal, user equipment (UE), mobile station, mobile terminal, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), and the Internet of Things (internet of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the terminal equipment.

Network equipment and terminal equipment can be fixed-location or removable. Network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the sky. The embodiments of this application do not limit the application scenarios of network devices and terminal devices.

The roles of network equipment and terminal equipment can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For those terminal equipment 120j that accesses the wireless access network through 120i, the terminal Device 120i is a network device; but for network device 110a, 120i is a terminal device, that is, communication between 110a and 120i is through a wireless air interface protocol. Of course, communication between 110a and 120i can also be carried out through an interface protocol between base stations. In this case, relative to 110a, 120i is also a network device. Therefore, both network equipment and terminal equipment can be collectively called communication devices. 110a and 110b in Figure 1 can be called communication devices with network equipment functions, and 120a-120j in Figure 1 can be called communication devices with terminal equipment functions. .

Communication between network equipment and terminal equipment, between network equipment and network equipment, and between terminal equipment and terminal equipment can be carried out through licensed spectrum, communication can also be carried out through unlicensed spectrum, or communication can be carried out through licensed spectrum and unlicensed spectrum at the same time. Communication; You can communicate through spectrum below 6 gigahertz (GHz), you can communicate through spectrum above 6GHz, and you can also communicate using spectrum below 6GHz and spectrum above 6GHz at the same time. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

In the embodiments of the present application, the functions of the network device may also be executed by modules (such as chips) in the network device, or may be executed by a control subsystem that includes the functions of the network device. The control subsystem here that includes network equipment functions can be the control center in the above application scenarios such as smart grid, industrial control, smart transportation, smart city, etc. The functions of the terminal equipment can also be performed by modules in the terminal equipment (such as chips or modems), or can be performed by devices containing the functions of the terminal equipment.

In this application, the network device sends downlink signals or downlink information to the terminal device, and the downlink information is carried on the downlink channel; the terminal device sends uplink signals or uplink information to the network device, and the uplink information is carried on the uplink channel. In order for the terminal device to communicate with the network device, A wireless connection needs to be established with the cell controlled by the network device. The cell with which a terminal device has established a wireless connection is called the serving cell of the terminal device. When the terminal equipment communicates with the serving cell, it will also be interfered by signals from neighboring cells.

In order to facilitate understanding of the embodiments of the present application, the terms involved in the embodiments of the present application are briefly explained below. It should be understood that these descriptions are only to facilitate understanding of the embodiments of the present application and should not constitute any limitation to the present application.

1. Space layer

For spatial multiplexing multiple input multiple output (MIMO) systems, multiple parallel data streams can be transmitted simultaneously on the same frequency domain resources. Each data stream is called a spatial layer or transmission layer or spatial stream or transmission. flow.

2. Orthogonal cover code (OCC)

Any two sequences are orthogonal sequence groups. The OCC codeword sequence is used in the CDM group to ensure the orthogonality of the ports, thereby reducing the interference of reference signals transmitted between ports.

3. Reference signal (RS)

Reference signals include but are not limited to demodulation reference signal (DMRS), sounding reference signal (Sounding reference signal, SRS), or cell reference signal (cell reference signal, CRS), etc.

4. DMRS

DMRS is used by receiving equipment (such as network equipment or terminal equipment) to perform equivalent channel estimation and detect data channels or control channels based on the equivalent channel estimation results. For example, the data channel includes a physical downlink shared channel (PDSCH) and/or a physical uplink shared channel (PUSCH). Control channels include physical downlink control channel (PDCCH).

Specifically, taking PDSCH as an example, channel estimation is introduced:

The data signals transmitted by DMRS and PDSCH are precoded in the same way, thereby ensuring that DMRS and data signals experience the same equivalent channel. The originating device sends DMRS and data signals to the receiving device. Among them, the vector of the DMRS sent by the originating device is s, and the vector of the data signal sent is x. DMRS performs the same precoding operation as the data signal (multiplied by the same precoding matrix P). Correspondingly, the vector of the data signal received by the receiving device satisfies:

Among them, y represents the vector of data signals received by the receiving device, H represents the channel frequency domain response between the transmitting device and the receiving device, P represents the precoding matrix used by the transmitting device, and x represents the vector of data signals sent by the transmitting device. , n represents the vector of noise, Indicates the equivalent channel frequency domain response between the originating device and the receiving device.

The DMRS vector received by the receiving device satisfies:

Among them, r represents the vector of DMRS received by the receiving device, H represents the channel frequency domain response between the transmitting device and the receiving device, P represents the precoding matrix used by the transmitting device, s represents the vector of DMRS sent by the transmitting device, n A vector representing noise, Indicates the equivalent channel frequency domain response between the originating device and the receiving device.

It can be seen from formula (1) and formula (2) that the data signal and the reference signal experience the same equivalent channel. The receiving device uses a channel estimation algorithm, such as least square, based on the known vector s of the reference signal. LS) channel estimation, minimum mean square error (MMSE) channel estimation, etc., for equivalent channels estimate, and then based on the equivalent channel The estimation result completes MIMO equalization and demodulation of the data signal.

The vector of DMRS can be expressed as a matrix with N _R rows and R columns, that is, the dimension is N _R ×R. Among them, _NR represents the number of receiving antennas of the receiving device, and R represents the number of spatial layers. Generally speaking, one spatial layer corresponds to one DMRS port. For MIMO transmission with R spatial layer number, the number of DMRS ports is R. In order to ensure the quality of channel estimation, different DMRS ports are usually orthogonal ports. DMRS symbols corresponding to different DMRS ports are orthogonal in the frequency domain, time frequency or code domain.

Since DMRS occupies certain time-frequency resources, in order to reduce the overhead of DMRS as much as possible and reduce the interference between DMRS time-frequency resources corresponding to different DMRS ports, frequency division multiplexing, time division multiplexing or code division multiplexing is often used. way, DMRS symbols are mapped to preset time-frequency resources. For example, the 5G system supports two DMRS resource mapping types. For Type 1 DMRS, a maximum of 8 orthogonal DMRS ports can be supported; for Type 2 DMRS, a maximum of 12 orthogonal DMRS ports can be supported. For a DMRS port, in order to perform channel estimation on different time-frequency resources and ensure the quality of channel estimation, DMRS symbols need to be sent in multiple time-frequency resources. DMRS symbols can occupy at least one orthogonal frequency division multiplexing (OFDM) symbol in the time domain, and the bandwidth occupied in the frequency domain is the same as the scheduling bandwidth of the data signal. For a DMRS port, Multiple OFDM symbols corresponding to this port correspond to the same reference signal sequence. A reference signal sequence consists of multiple elements. The reference signal sequence corresponding to DMRS may be a gold sequence. Next, using the gold sequence of length 31 as the pseudo-random sequence c(n), the n-th element in the reference signal sequence is introduced. Among them, the nth element in the reference signal sequence satisfies:

Among them, r(n) represents the n-th element in the reference signal sequence, n=0,1,...,M _PN -1, M _PN represents the sequence length of the pseudo-random sequence c(n), and c(2n) represents pseudo-randomness. The 2nth element in the sequence, c(2n+1) represents the 2n+1th element in the pseudo-random sequence. The pseudo-random sequence c(n) satisfies:

Among them, c(n) represents the pseudo-random sequence, N _c =1600, x ₁ (n) represents the first m sequence, x ₁ (0) = 1, x ₁ (n) = 1, n = 1,2, ...,30, x ₂ (n) represents the second m sequence, and the x ₂ (n) sequence is determined by the initialization factor c _init . The initialization factor c _init of the x ₂ (n) sequence satisfies:

Among them, c _init represents the initialization factor, Indicates the number of OFDM symbols in a time slot, represents the time slot index within a system frame, l represents the index of OFDM symbol, Represents the sequence scrambling code identifier, represents the scrambling factor, λ represents the index of the CDM group, Represents downward rounding operation.

For DMRS in adjacent frequency domain locations, different scrambling factors can be used To achieve the effect of reducing PAPR. Among them, the scrambling factor satisfy:

in, Represents the scrambling factor. n _SCID indicates that in the case of λ=0 or λ=2, the scrambling factor value. 1-n _SCID represents the scrambling factor when λ=1 value. λ represents the index of the CDM group.

When the DMRS sequence initialization indication field is configured in downlink control information (DCI) signaling, n _SCID ∈ {0,1} may be indicated through DCI signaling. That is to say, the DCI signaling indicates that the value of n _SCID is 0, or the DCI signaling indicates that the value of n _SCID is 1. In other cases, the default n _SCID =0.

and The value of can be configured by high-level signaling. Related to cell ID (identification), usually equal to cell ID,

The DMRS sequence corresponding to a port is mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence through the preset time-frequency resource mapping rules. In the current new radio (NR) protocol, two types of DMRS configuration methods are defined, including Type 1 DMRS and Type 2 DMRS.

For port p, the m-th element r(m) in the DMRS sequence corresponding to the port is mapped to the resource element (RE) with index (k, l) _{p, μ} according to the following rules. Among them, the RE with index (k, l) _{p, μ} corresponds to the OFDM symbol with index l in a time slot in the time domain, and corresponds to the subcarrier with index k in the frequency domain. The mapping rules satisfy:

k′=0,1;

n=0,1,…;
l′=0,1;

Among them, p is the port number, μ is the subcarrier spacing parameter, is the DMRS modulation symbol mapped to the RE with index (k,l) _p,μ , is the symbol index of the first OFDM symbol occupied by the DMRS modulation symbol or the symbol index of the reference OFDM symbol, is the power scaling factor, w _t (l′) is the time domain mask element corresponding to the l′th OFDM symbol occupied by the DMRS modulation symbol, w _f (k′) is the frequency corresponding to the k′th subcarrier occupied by the DMRS modulation symbol Domain mask element, m=2n+k′, Δ is the subcarrier offset factor. OCC includes the above-mentioned time domain mask elements and frequency domain mask elements.

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

Table 1

In Table 1, when the value of DMRS port p is 1000, the values of λ and Δ are 0. In the case of k′=0, the value of w _f (k′) is +1, and in the case of k′=1, the value of w _f (k′) is +1. When l′=0, the value of w _t (l′) is +1, and when l′=1, the value of w _t (l′) is +1. Other values of DMRS port p in Table 1 can be deduced in this way and will not be described again.

In the Type 2 DMRS mapping rule, the values of w _f (k′), w _t (l′), and Δ corresponding to the DMRS port p can be determined according to Table 2. Among them, Table 2 is introduced as follows:

Table 2

In Table 2, when the value of DMRS port p is 1000, the values of λ and Δ are 0. In the case of k′=0, the value of w _f (k′) is +1, and in the case of k′=1, the value of w _f (k′) is +1. When l′=0, the value of w _t (l′) is +1, and when l′=1, the value of w _t (l′) is +1. Other values of DMRS port p in Table 2 can be deduced in this way and will not be described again.

According to formula (17), the time-frequency resource mapping method of Type 1 DMRS is introduced as follows:

As shown in Figure 2, for single-symbol DMRS (corresponding to l'=0), a maximum of 4 DMRS ports are supported. Among them, 4 DMRS ports are divided into 2 CDM groups. CDM group 0 includes port 0 and port 1, and CDM group 1 includes port 2 and port 3. CDM group 0 And CDM group 1 is frequency division multiplexing (mapped on different frequency domain resources). The DMRS ports included in the CDM group are mapped to the same time-frequency resources. The reference signals corresponding to the DMRS ports included in the CDM group are distinguished through OCC to ensure the orthogonality of the DMRS ports in the CDM group, thereby suppressing interference between reference signals transmitted on different DMRS ports. Specifically, port 0 and port 1 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner. That is, the adjacent frequency domain resources occupied by port 0 and port 1 are separated by one subcarrier. For a DMRS port, the two adjacent REs occupied correspond to an OCC codeword sequence of length 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 use a set of OCC codeword sequences of length 2 (+1+1 and +1-1). Similarly, port 2 and port 3 are located in the same RE and are mapped to 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 use a set of OCC codeword sequences of length 2 (+1+1 and +1-1).

As shown in Figure 3, for dual-symbol DMRS (corresponding to l'=0 and l'=1), a maximum of 8 DMRS ports are supported. Among them, 8 DMRS ports are divided into 2 CDM groups. CDM group 0 includes port 0, port 1, port 4 and port 5, and CDM group 1 includes port 2, port 3, port 6 and port 7. CDM group 0 and CDM group 1 are frequency division multiplexers, and the reference signals corresponding to the DMRS ports included in the CDM group are distinguished by OCC. Specifically, port 0, port 1, port 4 and port 5 are located in the same RE, and resource mapping is performed in the frequency domain in a comb-tooth manner, that is, the adjacent frequencies occupied by port 0, port 1, port 4 and port 5 are Domain resources are spaced one subcarrier apart. For a DMRS port, the occupied two adjacent subcarriers and two OFDM symbols correspond to an OCC codeword sequence of length 4. For example, for subcarrier 0 and subcarrier 2 corresponding to OFDM symbol 1 and OFDM symbol 2, port 0, port 1, port 4 and port 5 use a set of OCC codeword sequences with a length of 4 (+1+1+1+1 /+1+1-1-1/+1-1+1-1/+1-1-1+1). Similarly, port 2, port 3, port 6 and port 7 are located in the same RE and are mapped to the unoccupied subcarriers of port 0, port 1, port 4 and port 5 in a comb-tooth manner in the frequency domain. For subcarrier 1 and subcarrier 3 corresponding to OFDM symbol 1 and OFDM symbol 2, port 2, port 3, port 6 and port 7 use a set of OCC codeword sequences with a length of 4 (+1+1+1+1/+ 1+1-1-1/+1-1+1-1/+1-1-1+1).

According to formula (17), the time-frequency resource mapping method of Type 2 DMRS is introduced as follows:

As shown in Figure 4, for single-symbol Type 2 DMRS (corresponding to l′=0), a maximum of 6 DMRS ports are supported. Among them, 6 DMRS ports are divided into 3 CDM groups. Frequency division multiplexing is used between CDM groups. The reference signals corresponding to the DMRS ports included in the CDM group are distinguished by OCC to ensure the orthogonality of the DMRS ports in the CDM group. , thus suppressing interference between reference signals transmitted on different DMRS ports. Specifically, CDM group 0 includes port 0 and port 1, CDM group 1 includes port 2 and port 3, and CDM group 2 includes port 4 and port 5. CDM groups are frequency division multiplexed (mapped on different frequency domain resources). The reference signals corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signals corresponding to the DMRS ports included in the CDM group are distinguished by OCC. For a DMRS port, its corresponding DMRS is mapped in multiple resource sub-blocks containing two consecutive sub-carriers in the frequency domain, and adjacent resource sub-blocks are separated by four sub-carriers in the frequency domain. Specifically, port 0 and port 1 are located in the same resource particle (RE), and resource mapping is performed in a comb-tooth manner. Taking the frequency domain resource granularity as 1 resource block (RB) as an example, port 0 and port 1 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7. Port 2 and port 3 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9. Port 4 and port 5 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11. For the two DMRS ports included in a CDM group, there are corresponding OCC codeword sequences of length 2 (+1+1 and +1-1) in the two adjacent subcarriers.

As shown in Figure 5, for dual-symbol Type 2 DMRS (corresponding to l′=0 and l′=1), a maximum of 12 ports are supported. The 12 DMRS ports are divided into 3 CDM groups. Frequency division multiplexing is used between CDM groups. The reference signals corresponding to the DMRS ports included in the CDM group ensure orthogonality through OCC. Among them, 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. CDM groups are frequency division multiplexed (mapped on different frequency domain resources). The reference signals corresponding to the DMRS ports included in the CDM group are mapped on the same time-frequency resources. The reference signals corresponding to the DMRS ports included in the CDM group are distinguished by OCC. For a DMRS port, its corresponding DMRS is mapped in multiple resource sub-blocks containing two consecutive sub-carriers in the frequency domain, and adjacent resource sub-blocks are separated by four sub-carriers in the frequency domain. Specifically, the ports included in a CDM group are located in the same resource element (RE), and resource mapping is performed in the frequency domain in a comb-tooth manner. Taking the frequency domain resource granularity as 1RB as an example, port 0, port 1, port 6 and port 7 occupy subcarrier 0, subcarrier 1, subcarrier 6 and subcarrier 7 corresponding to OFDM symbol 1 and OFDM symbol 2. Port 2, port 3, port 8 and port 9 occupy subcarrier 2, subcarrier 3, subcarrier 8 and subcarrier 9 corresponding to OFDM symbol 1 and OFDM symbol 2. Port 4, port 5, port 10 and port 11 occupy subcarrier 4, subcarrier 5, subcarrier 10 and subcarrier 11 corresponding to OFDM symbol 1 and OFDM symbol 2. For the 4 DMRS ports included in a CDM group, the corresponding OCC codeword sequence of length 4 (+1+1+1+1/+1+1- 1-1/+1-1+1-1/+1-1-1+1).

As wireless communication equipment is deployed more densely in the future, the number of terminal devices continues to grow, placing higher demands on the number of MIMO transmission streams. Moreover, with the continuous evolution of massive MIMO (Massive MIMO) systems, the number of transmitting and receiving antennas has further increased (such as network equipment The number of transmitting antennas supports 128T or 256T, and the number of receiving antennas of terminal equipment supports 8R). The channel information is obtained more accurately, and it is necessary to further support a higher number of transmission streams to improve the spectrum efficiency of the MIMO system. The above aspects will inevitably require more DMRS ports to support a higher number of transmission streams (for example, the number of transmission streams is greater than 12). As the number of transmission streams increases, the accuracy of channel estimation is required to be higher. However, the current maximum of 12 orthogonal ports cannot guarantee the transmission performance of more than 12 streams.

Next, a method for expanding the number of orthogonal DMRS ports is introduced as an example, that is, a time-frequency resource mapping method that introduces more DMRS ports through frequency division multiplexing, which can also be referred to as an adaptive DMRS port frequency division expansion method. The method is introduced as follows:

According to the NR protocol, the total number of ports supported by DMRS is related to the following two factors: DMRS configuration type, or the number of OFDM symbols occupied by DMRS in the time domain. At the same time, the number of time domain OFDM symbols occupied by a DMRS configuration type and a type of DMRS corresponds to a maximum number of DMRS ports. The number of orthogonal DMRS port combinations supported by the current NR protocol is shown in Table 3 below:

table 3

In Table 3, when DMRS is configured as Type1 and single symbol, a maximum of 4 ports are supported. See Figure 2 for details. When DMRS is configured as Type1 and dual-symbol, a maximum of 8 ports are supported. See Figure 3 for details. When DMRS is configured as Type2 and is single symbol, a maximum of 6 ports are supported. See Figure 4 for details. When DMRS is configured as Type2 and dual-symbol, a maximum of 12 ports are supported. See Figure 5 for details.

Combined with Figure 6, the single-symbol Type1 DMRS is introduced:

In (a) of Figure 6, single symbol Type1 supports up to 4 ports. Among them, the orthogonal mode is 2 comb divisions plus 2 code divisions, which specifically includes: frequency division multiplexing of two sets of orthogonal DMRS ports for even-numbered REs and odd-numbered REs, and, for each set of time-frequency resources The same DMRS ports, such as port0 and port1, use code division for orthogonal multiplexing, that is, the corresponding OCCs are ++ and +- respectively. Among them, the time-frequency resource group corresponding to the even-numbered RE is denoted as CDM group 0 (λ=0), and the time-frequency resource group corresponding to the odd-numbered RE is denoted as CDM group 1 (λ=1).

On this basis, when Type1 single-symbol DMRS is configured on the network device side, the scenario where it is necessary to further increase the number of orthogonal DMRS ports is introduced:

In (b) of Figure 6, when the total number of ports is 5 to 6, CDM group 1 can be designed sparsely, and some of the subcarriers are used for frequency division multiplexing of the two new DMRS ports, such as port4 and port5. . The time-frequency resources corresponding to the DMRS port of CDM group 0 will not change. Corresponding to this kind of time-frequency resource allocation, since the time-frequency resources of CDM group 1 are divided into two groups, the time-frequency resources corresponding to the original port2 and port3 have been reduced. Therefore, in order to flexibly indicate the time-frequency resources corresponding to the current port index of the terminal device Position, update the original port2 and port3 port indexes to port6 and port7, and their corresponding time-frequency resource positions are part of the REs of the original CDM group 1. In this case, the terminal device can learn the DMRS configuration type, the number of OFDM symbols and the corresponding port index notified by the network device. Therefore, the terminal device can accurately obtain the time-frequency resource location mapped by DMRS, thereby effectively performing the corresponding pilot location DMRS channel estimation.

In (c) of Figure 6, when the total number of ports is 7 to 8, CDM group 0 can be further sparsely designed. Specifically, based on (b) of Figure 6, take the two newly added DMRS ports for sub-carrier frequency division multiplexing in CDM group 0, such as port10 and port11. Corresponding to this kind of time-frequency resource allocation, since the time-frequency resources of CDM group 0 are divided into two groups, the time-frequency resources corresponding to the original port0 and port1 have been reduced. Therefore, in order to flexibly indicate the time-frequency resources corresponding to the current port index of the terminal device Position, update the original port0 and port1 port indexes to port8 and port9, and their corresponding time-frequency resource positions are part of the REs of the original CDM group 0. In other words, the corresponding new port indexes are port8, port9, port10, and port11 respectively.

To sum up, the maximum number of ports supported by Type1 single symbol DMRS is extended from 4 to 8.

Combined with Figure 7, the dual-symbol Type1 DMRS is introduced:

In (a) of Figure 7, dual-symbol Type1 supports up to 8 ports. Similarly, in (b) of Figure 7, when the total number of ports is 9 to 12, port capacity can be expanded by splitting CDM group 1, and the corresponding new port numbers are port8 to port15. In (c) of Figure 7, when the total number of ports is 13 to 16, port capacity can be expanded by splitting CDM group 0, and the corresponding new port numbers are port16 to port23. As mentioned above, the existing Type1 dual-symbol DMRS that supports a maximum of 8 ports can be further supported to a maximum of 16 ports.

Similarly, Figure 8 shows a schematic diagram of resource mapping of single-symbol Type2 DMRS. For specific expansion methods, please refer to the introduction in Figure 6 and will not be described again here. Figure 9 shows a schematic diagram of resource mapping of dual-symbol Type2 DMRS. For specific expansion methods, please refer to the introduction in Figure 7 and will not be described again here.

Currently, the NR protocol defines the DMRS symbols and time-frequency resource mapping method corresponding to the DMRS port. During each data transmission, the network device notifies the DMRS port assigned to the end device. Based on the allocated DMRS port, the terminal device performs the DMRS signal reception and channel estimation process at the corresponding resource location in accordance with the DMRS symbol generation method and time-frequency resource mapping rules defined by the protocol. The DMRS port notification method defined in the NR protocol is as follows: high-layer signaling semi-statically configures the DMRS type, and DCI signaling dynamically notifies the allocated DMRS port index. The details are as follows:

First, RRC signaling configures the DMRS type and number of occupied symbols.

The DMRS type used is configured through high-layer signaling DMRS-DownlinkConfig. The specific signaling content is as follows:

Among them, the dmrs-Type field is used to indicate the DMRS type, that is, whether Type 1 DMRS or Type 2 DMRS is used. The maxLength field is used to indicate the number of symbols, that is, whether single-symbol DMRS or dual-symbol DMRS is used. Among them, the maxLength field is len2, which means it occupies two symbols. If the maxLength field is configured as len2, the network device can further indicate whether to use single-symbol DMRS or dual-symbol DMRS through DCI signaling. If the maxLength field is not configured, 1-symbol DMRS is used.

Second, DCI signaling notifies the assigned DMRS port index

DCI signaling includes an antenna port (Antenna port) field. Among them, the Antenna port field is used to indicate the DMRS port index. The NR protocol defines different DMRS port tables for different values configured in the dmrs-Type field and maxLength field. Specifically, Table 4 shows the DMRS port table corresponding to dmrs-Type=1, maxLength=2, and Table 5 shows the DMRS port table corresponding to dmrs-Type=2, maxLength=2. The Antenna port field in DCI signaling indicates an index value, which corresponds to the index of one or more DMRS ports.

Table 4

Taking Table 4 as an example, when a single codeword is used, the Antenna port field in DCI signaling indicates an index value. For example, the index value is 3, and the index of the DMRS port in the row where the index value 3 is located is 0. It can be understood that the DMRS port index indicated by DCI signaling is 0.

table 5

Taking Table 5 as an example, when a single codeword is used, the Antenna port field in DCI signaling indicates an index value. For example, the index value is 2, and the index of the DMRS port in the row where the index value 2 is located is 0. It can be understood that the DMRS port index indicated by DCI signaling is 0,1.

However, the above formulas (3) to (5) and the sequence generation method introduced in formula (16) are not suitable for the DMRS port frequency division expansion method because:

In equation (16), the scrambling factor The value of can be 0 or 1. For DMRS at adjacent frequency domain positions, the corresponding scrambling factor The values are different to achieve the effect of low PAPR. λ represents the index of the CDM group, and the value can be 0/1/2. After DMRS frequency division expansion, the value range of the CDM group index changes. For example, the expanded Type1 DMRS has a maximum of 4 CDM groups, and the expanded Type1 DMRS has a maximum of 6 CDM groups. The original 0/1 /2 cannot meet the needs. Therefore, how to generate sequence initialization factors for the expanded DMRS is an issue that needs to be solved urgently.

In view of this, embodiments of the present application provide a sequence generation method, which can be applied to the communication system in Figure 1 . In the following embodiments of the present application, the names of the messages between the devices or the names of the parameters in the messages are just examples, and other names may also be used in specific implementations, which are not specifically limited in the embodiments of the present application.

Next, the sequence generation method 1000 proposed in the embodiment of the present application will be introduced in detail with reference to Figures 10 to 11 . The sequence generation method 1000 proposed in the embodiment of this application includes the following steps:

S1001. The first communication device determines an initialization factor of the first sequence according to the first parameter.

The first parameter is a port index, or the first parameter is a CDM group identifier. The first sequence is used to generate the reference signal.

S1002. The first communication device generates a first sequence according to the initialization factor.

For example, in S1002, the first sequence may be the x ₂ (n) sequence, and the initialization factor may be c _init . The first communication device may determine the first sequence, that is, the x ₂ (n) sequence according to the initialization factor.

In the above-mentioned S1001 and S1002, the first communication device may be the network device in FIG. 1 or the terminal device in FIG. 1 . For example, in the case of uplink transmission, the first communication device may be the terminal device in Figure 1 . In the case of downlink transmission, the first communication device may be the network device in FIG. 1 .

In the above S1001 and S1002, the initialization factors of the first sequence are introduced through two examples (example 1 and example 2 below):

Example 1,

The initialization factor of the first sequence satisfies formula (5), that is:

Among them, c _init represents the initialization factor of the first sequence, Indicates the number of OFDM symbols in a time slot, represents the time slot index within a system frame, l represents the index of OFDM symbol, Represents the sequence scrambling code identifier, Represents the scrambling factor.

Among them, the scrambling factor The introduction is as follows:

In Example 1, the scrambling factor satisfy:

Among them, λ represents the first parameter, Indicates the value of the first parameter. n The value of _SCID can be found in the introduction of S1004 and will not be described here. a represents an integer. For example, a=1. Correspondingly, formula (6) can be transformed into:

It should be understood that in equation (7), the scrambling factor The value of is transformed from {0,1} to {0,N _λ -1}. That is, the scrambling factor The value of is no longer limited to 0/1, but can have more values. For example, or

It can be seen from formula (6) or formula (7) that if the value of the first parameter is different, then the scrambling factor Not the same either. The first parameter can be a CDM group identifier or a port index. In this way, the first parameter corresponding to different CDM groups is different. When the first parameter is the CDM group identifier, the value of the first parameter is no longer limited to 0/1/2. When the first parameter is the port index In the case of , the first parameter can indicate more port indexes. Even if the first parameter has more possible values, the first communication device can determine the scrambling factor based on formula (6) or formula (7) Moreover, the scrambling factors corresponding to different CDM groups Different, so that the reference signal at the adjacent frequency domain position can achieve the effect of low PAPR.

Among them, the sequence scrambling code identification The introduction is as follows:

In Example 1, as a possible implementation, sequence scrambling identifies satisfy:

in, Indicates sequence scrambling code identification The candidate values of i=0,1,…,k-1. Represents the scrambling factor. k represents the number of candidate values for the sequence scrambling code identifier, k≥2. For example, k=2. Correspondingly, formula (8) can be transformed into:

in, and The value of can be configured by high-level signaling, which will not be described again here. It should be understood that with the evolution of communication technology, k may also have other values. For example, high-level signaling in addition to configuration and In addition to the value of , it is also configured The value of , in this case, k=3, which is not limited in the embodiment of the present application.

In Example 1, as another possible implementation, sequence scrambling identifies satisfy:

in, Indicates sequence scrambling code identification Candidate values of i=0,1,…,k-1; λ represents the first parameter, Indicates the value of the first parameter. k represents the number of candidate values for the sequence scrambling code identifier, k≥2. For example, k=2. Correspondingly, formula (10) can be transformed into:

in, and Please refer to the introduction of formula (9) and will not go into details here.

In Example 1, it can be seen from formula (6) and formula (7) that the scrambling factor The value is no longer 0/1, but may have more values. After formula (9) or formula (11) is used for calculation, the sequence scrambling code identification The value can be compatible with existing protocols.

Example 2,

The initialization factor of the first sequence satisfies formula (5), that is:

Among them, the scrambling factor The introduction is as follows:

In example 2, the scrambling factor satisfy:

Among them, λ represents the first parameter, Indicates the value of the first parameter. n The value of _SCID can be found in the introduction of S1004 and will not be described here. k represents a positive integer, k≥2. For example, k=2. Correspondingly, formula (12) can be transformed into:

It should be understood that in equation (12) or equation (13), the scrambling factor The value is still 0 or 1.

It can be seen from formula (12) or formula (13) that the scrambling factor corresponding to the first parameter with continuous values Not the same either. The first parameter can be a CDM group identifier or a port index. In this way, the first parameters corresponding to the CDM groups at adjacent frequency domain positions are continuous, even if the first parameter has more possible values, the first communication device determines the scrambling factor based on Formula (12) or Formula (13) Moreover, the scrambling factors corresponding to different CDM groups in adjacent frequency domain positions Different, it can also make the reference signal in the adjacent frequency domain position have a low PAPR effect.

In example 2, the sequence scrambling code identifies satisfy:

In Example 2, it can be seen from formula (12) and formula (14) that the scrambling factor The value of is still 0/1, and after using formula (14) for calculation, the sequence scrambling code identification The value can be compatible with existing protocols.

Optionally, introduce the first parameter through three methods (method 1 to method 3 below):

Method 1, the first parameter is the port index

For example, taking Table 1 as an example, the first parameter may be a certain value from 1000 to 1007. For another example, taking Table 2 as an example, the first parameter can be a certain value from 1000 to 1011.

Since there is a mapping relationship between the port index (p) and the CDM group index (λ), as shown in the first and second columns of Table 1 (or Table 2), therefore, when the first communication device learns the port index Next, combined with Table 1 (or Table 2), you can determine the CDM group where the port is located.

It should be understood that the port in Mode 1 usually refers to an antenna port, and may also be a port in other forms, such as a physical port of an antenna.

In mode 1, as shown in Figure 11, the sequence generation method 1000 in the embodiment of the present application also includes S1003:

S1003. The second communication device sends the first signaling to the first communication device. Correspondingly, the first communication device receives the first signaling from the second communication device.

Wherein, the first signaling indicates the first parameter.

Exemplarily, the first communication device is a terminal device, the second communication device is a network device, and the first signaling is DCI signaling. For example, the Antenna port field in the DCI signaling indicates an index value. The first communication device combines Table 4 and Table 5 to determine the port index corresponding to the index value in DCI signaling.

Method 2, the first parameter is the CDM group identifier

The first parameter satisfies:
0≤λ≤N _λ -1 Formula (15)

Among them, N _λ represents the number of CDM groups.

For example, taking (c) in Figure 7 as an example, N _λ =4, the first parameter can be a certain value from 0 to 3, such as λ = 0, λ = 1, λ = 2, or λ = 3.

For another example, taking (d) in Figure 8 as an example, N _λ =6, the first parameter can be a certain value from 0 to 5, such as λ = 0, λ = 1, λ = 2, λ = 3, λ=4, or λ=5.

In other words, the CDM group identifier is no longer limited to the three fixed values of 0/1/2, but can have more possible values. Even if the number of CDM groups increases, in the case where the first parameter is the CDM group identifier, the first communication device can determine the scrambling factor according to the first parameter Make reference signals at adjacent frequency domain positions correspond to different scrambling factors

Method 3, the first parameter is other identifiers

The first parameter may also be other identifiers, such as antenna panel identifiers or other identifiers. For example, predefine a mapping relationship 1. Among them, mapping relationship 1 indicates the mapping relationship between the status indicated by the signaling and the port index. The first communication device determines the port index according to the status indicated by a certain signaling and the predefined mapping relationship 1, and then determines the CDM group identifier according to the port index and the above table 1 (or table 2). Among them, mapping relationship 1 is shown in Table 6:

Table 6

In Table 6, when the status of the signaling indication is 00, the port index of the signaling indication is 0. When the status of the signaling indication is 01, the port index of the signaling indication is 1. Other lines can be deduced in this way and will not be described again.

It should be understood that the first parameters introduced in the above methods 1 to 3 are applicable to the above examples 1 and 2.

In some embodiments, as shown in Figure 11, the sequence generation method 1000 in this embodiment of the present application also includes S1004:

S1004. The second communication device sends the second signaling to the first communication device. Correspondingly, the first communication device receives the Second signaling.

The second signaling indicates the value of n _SCID .

Exemplarily, the first communication device is a terminal device, the second communication device is a network device, and the second signaling is DCI signaling. For example, when the DMRS sequence initialization indication field is configured in the DCI signaling, the DCI signaling is indicated through this field. n _SCID ∈ {0,1}, it can be understood that DCI signaling indicates whether the value of n _SCID is 0 or 1.

In other words, the value of parameter n _SCID changes dynamically and can be dynamically indicated through signaling.

In addition, when the DCI signaling does not indicate the value of n _SCID , n _SCID =0 is defaulted.

In some embodiments, as shown in Figure 10, the sequence generation method 1000 in this embodiment of the present application also includes S1005 and S1006:

S1005. The first communication device generates a first reference signal according to the first sequence.

For example, based on formula (3) and formula (4), the first sequence may be sequence x ₂ (n), and the first reference signal may be DMRS. The first communication device generates a pseudo-random sequence c(n) based on the first sequence and formula (4), and then generates a reference signal sequence r(n) based on the pseudo-random sequence c(n) and formula (3). The first communication device The device generates a first reference signal according to the reference signal sequence r(n). Please refer to the related technology, which will not be described again here.

S1006. The first communication device sends the first reference signal to the second communication device. Correspondingly, the second communication device receives the first reference signal from the first communication device.

Exemplarily, the first communication device sends the first reference signal to the second communication device on the mapped time-frequency resource, so that the second communication device performs equivalent channel estimation based on the first reference signal.

In some embodiments, as shown in Figure 10, the sequence generation method 1000 in this embodiment of the present application also includes S1007 and S1008:

S1007. The second communication device sends a second reference signal to the first communication device. Correspondingly, the first communication device receives the second reference signal from the second communication device.

For the generation process of the second reference signal, please refer to the introduction of S1001, S1002 and S1005, that is, the second communication device executes S1001, S1002 and S1005 to generate the second reference signal.

Exemplarily, the first communication device receives the second reference signal from the second communication device on the mapped time-frequency resource, so that the first communication device performs equivalent channel estimation based on the second reference signal.

S1008. The first communication device processes the second reference signal according to the first sequence.

Exemplarily, the first communication device determines multiple reference signals according to the first sequence, and uses the reference signal among the multiple reference signals that has the greatest correlation with the second reference signal to perform equivalent channel estimation, so as to improve the accuracy of the equivalent channel estimation. .

It should be understood that in the embodiment of the present application, formula (5) is used to introduce the formula form that satisfies the initialization factor c _init of the x ₂ (n) sequence. This application does not exclude the possibility of defining other formulas or other expressions to express the same or similar meaning in future agreements. Any modifications, equivalent substitutions, improvements, etc. that satisfy the characteristics of the first parameter and the first sequence of initialization factors described in the embodiments of this application, that is, within the spirit and principles of the embodiments of this application, shall include Within the protection scope of the embodiments of this application.

The above mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various network elements. Correspondingly, embodiments of the present application also provide a communication device. The communication device may be the network element in the above method embodiment, or a device including the above network element, or a component that can be used for the network element. It can be understood that, in order to implement the above functions, the communication device includes corresponding hardware structures and/or software modules for performing each function. Persons skilled in the art should easily realize that, with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

For example, FIG. 12 shows a schematic structural diagram of a communication device 1200. The communication device 1200 includes a processing unit 1201, a sending unit 1202 and a receiving unit 1203. The communication device 1200 may be the first communication device in FIG. 10 .

In a possible example, the processing unit 1201 is configured to determine an initialization factor of the first sequence according to the first parameter, and the initialization factor of the first sequence satisfies:

Among them, c _init represents the initialization factor of the first sequence, Indicates the number of OFDM symbols in a time slot, represents the time slot index within a system frame, l represents the index of OFDM symbol, Represents the sequence scrambling code identifier, Represents scrambling factor, scrambling factor satisfy:

The processing unit 1201 is also used to generate the first sequence according to the initialization factor.

In another possible example, the processing unit 1201 is configured to determine the initialization factor of the first sequence according to the first parameter. Among them, the initialization factor of the first sequence satisfies:

In one possible design, the processing unit 1201 is configured to generate a first reference signal according to the first sequence. The sending unit 1202 is used to send the first reference signal.

In one possible design, the receiving unit 1203 is configured to receive the second reference signal. The processing unit 1201 is configured to process the second reference signal according to the first sequence.

Optionally, the communication device 1200 may also include a storage unit 1204 for storing program codes and data of the communication device. The data may include but is not limited to original data or intermediate data.

Among them, the processing unit 1201 can be a processor or a controller, such as a CPU, a general-purpose processor, an application specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other Programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various illustrative logical blocks, modules, and circuits described in connection with this disclosure. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, and so on.

The sending unit 1202 may be a communication interface, a transmitter or a sending circuit, etc., where the communication interface is a general term, and in a specific implementation, the communication interface may include multiple interfaces.

The receiving unit 1203 may be a communication interface, a receiver or a receiving circuit, etc., where the communication interface is a general term, and in a specific implementation, the communication interface may include multiple interfaces.

The sending unit 1202 and the receiving unit 1203 may be physically or logically implemented as the same unit.

The storage unit 1204 may be a memory.

When the processing unit 1201 is a processor, the sending unit 1202 and the receiving unit 1203 are communication interfaces, and the storage unit 1204 is a memory, the communication device involved in the embodiment of the present application may be as shown in FIG. 13 .

Referring to FIG. 13 , the communication device 1300 includes: a processor 1301 , a communication interface 1302 , and a memory 1303 . Optionally, the communication device may also include a bus 1304. Among them, the communication interface 1302, the processor 1301 and the memory 1303 can be connected to each other through the bus 1304; the bus 1304 can be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (EISA) bus etc. The bus 1304 can be divided into an address bus, a data bus, a control bus, etc. For ease of presentation, only one thick line is used in Figure 13, but it does not mean that there is only one bus or one type of bus.

Optionally, embodiments of the present application also provide a computer program product carrying computer instructions. When the computer instructions are run on a computer, they cause the computer to execute the method described in the above embodiments.

Optionally, embodiments of the present application also provide a computer-readable storage medium that stores computer instructions. When the computer instructions are run on a computer, they cause the computer to execute the method described in the above embodiments.

Optionally, the embodiment of the present application also provides a chip, including: a processing circuit and a transceiver circuit. The processing circuit and the transceiver circuit are used to implement the method introduced in the above embodiment. The processing circuit is used to perform the processing actions in the corresponding method, and the transceiver circuit is used to perform the receiving/transmitting actions in the corresponding method.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, e.g., the computer instructions may be transferred from a website, computer, server, or data center Transmission to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., digital video discs (DVD)), or semiconductor media (e.g., solid state drives (SSD)) wait.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or modules, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple devices. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Through the above description of the implementation, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation. . Based on this understanding, the essence or the contribution part of the technical solution of the present application can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, such as a computer floppy disk, a hard disk or an optical disk. etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present application.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Changes or substitutions within the technical scope disclosed in the present application shall be covered by the protection scope of the present application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A sequence generation method, characterized by including:

The communication device determines an initialization factor of the first sequence according to the first parameter, and the initialization factor of the first sequence satisfies:

Among them, c init represents the initialization factor of the first sequence, Indicates the number of orthogonal frequency division multiplexing OFDM symbols in a time slot, represents the time slot index within a system frame, l represents the index of OFDM symbol, Represents the sequence scrambling code identifier, represents the scrambling factor, the scrambling factor satisfy:

Where, λ represents the first parameter, Represents the value of the first parameter, k represents a positive integer, k≥2;

The communication device generates the first sequence based on the initialization factor.
The method according to claim 1, characterized in that the sequence scrambling code identifier satisfy:

in, expressed in In the case, the sequence scrambling code identifies value; expressed in In the case, the sequence scrambling code identifies value.
The method according to claim 1 or 2, characterized in that the first parameter is a port index.
The method according to any one of claims 1-3, characterized in that the method further includes:

The communication device receives first signaling, wherein the first signaling indicates the first parameter.
The method according to claim 1 or 2, characterized in that the first parameter is a code division multiplexing CDM group identifier.
The method according to claim 1, 2 or 5, characterized in that the first parameter satisfies:
0≤λ≤Nλ -1

Among them, λ is an integer, and N λ represents the number of CDM groups.
The method according to any one of claims 1-6, characterized in that the method further includes:

The communication device receives second signaling, wherein the second signaling indicates the value of the n SCID .
The method according to any one of claims 1-7, characterized in that the method further includes:

The communication device generates a first reference signal according to the first sequence;

The communication device sends the first reference signal.
The method according to any one of claims 1-8, characterized in that the method further includes:

The communication device receives a second reference signal;

The communication device processes the second reference signal according to the first sequence.
A sequence generation method, characterized by including:

The communication device determines an initialization factor of the first sequence according to the first parameter, and the initialization factor of the first sequence satisfies:

Among them, c init represents the initialization factor of the first sequence, Indicates the number of orthogonal frequency division multiplexing OFDM symbols in a time slot, represents the time slot index within a system frame, l represents the index of OFDM symbol, Represents the sequence scrambling code identifier, represents the scrambling factor, the scrambling factor satisfy:

Where, λ represents the first parameter, Represents the value of the first parameter, a represents an integer, a≠0;

The communication device generates the first sequence based on the initialization factor.
The method according to claim 10, characterized in that the sequence scrambling code identifier satisfy:

in, Represents the sequence scrambling code identifier Candidate values of i=0,1,…,k-1; represents the scrambling factor; k represents the number of candidate values for the sequence scrambling code identifier, k≥2.
The method according to claim 10, characterized in that the sequence scrambling code identifier satisfy:

in, Represents the sequence scrambling code identifier Candidate values of i=0,1,...,k-1; λ represents the first parameter, represents the value of the first parameter; k represents the number of candidate values of the sequence scrambling code identifier, k≥2.
The method according to any one of claims 10-12, characterized in that the first parameter is a port index.
The method according to any one of claims 10-13, characterized in that the method further includes:

The communication device receives first signaling, wherein the first signaling indicates the first parameter.
The method according to any one of claims 10 to 12, characterized in that the first parameter is a code division multiplexing CDM group identifier.
The method according to claim 10, 11, 12 or 15, characterized in that the first parameter satisfies:
0≤λ≤Nλ -1

Among them, λ is an integer, and N λ represents the number of CDM groups.
The method according to any one of claims 10-16, characterized in that the method further includes:

The communication device receives second signaling, wherein the second signaling indicates the value of the n SCID .
The method according to any one of claims 10-17, characterized in that the method further includes:

The communication device generates a first reference signal according to the first sequence;

The communication device sends the first reference signal.
The method according to any one of claims 10-18, characterized in that the method further includes:

The communication device receives a second reference signal;

The communication device processes the second reference signal according to the first sequence.
A communication device, characterized in that it includes: a processor and a memory, the processor is coupled to the memory, the memory stores program instructions, and when the program instructions stored in the memory are executed by the processor, The communication device is caused to perform the method as described in any one of claims 1-9, or as described in any one of claims 10-19.
A chip, characterized in that it includes a processor and an input-output interface. The input-output interface is used to receive signals from other devices other than the chip and transmit them to the processor or to transfer signals from the processor. The signal is sent to other devices outside the chip, and the processor is used to implement any one of claims 1-9, or as described in any one of claims 10-19 through logic circuits or execution of code instructions. Methods.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program. When the computer program is run on a communication device, the communication device causes the communication device to execute any of claims 1-9. The method described in any one of claims 10-19.