CN111769923B

CN111769923B - Method and device for generating demodulation pilot frequency reference signal

Info

Publication number: CN111769923B
Application number: CN201910263491.1A
Authority: CN
Inventors: 郭文婷; 向铮铮; 苏宏家; 张锦芳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2022-03-29
Anticipated expiration: 2039-04-02
Also published as: CN111769923A; WO2020200056A1

Abstract

The application provides a demodulation pilot frequency reference signal generation method and device, relates to the technical field of communication, particularly relates to V2X, intelligent driving, intelligent networking automobile, automatic driving or vehicle networking and the like, and can solve the problem that a communication terminal device cannot normally communicate when no network coverage exists. The method comprises the following steps: the first terminal device determines an initial value of a pseudo noise PN sequence according to the channel type and the first information, generates a first demodulation pilot reference signal according to the initial value of the PN sequence, and then sends the first demodulation pilot reference signal to the second terminal device. Wherein the first information comprises one or more of an identification of the first terminal device, system time information and a broadcast number index. The method is applied to the process of generating the demodulation pilot frequency reference signal by the terminal device.

Description

Method and device for generating demodulation pilot frequency reference signal

Technical Field

The application relates to the technical field of communication, in particular to V2X, intelligent driving, intelligent networking automobiles and the like, and particularly relates to a demodulation pilot frequency reference signal generation method and device.

Background

A demodulation pilot reference signal (DMRS) may be generally used for related demodulation of a Physical Uplink Shared Channel (PUSCH) and a Physical Uplink Control Channel (PUCCH). Currently, DMRSs can be generated by specifying sequences. Among them, as an implementation manner of generating the DMRS, in Long Term Evolution (LTE) of the universal mobile telecommunications technology, for a channel of DFT-OFDM (discrete frequency division multiplexing) waveform design of discrete fourier transform, first, a ZC (Zadoff-Chu sequence) is generated using a root sequence u and a root sequence v, and a base sequence of the DMRS is obtained based on the ZC sequence

Then, the base sequence is aligned

And carrying out cyclic shift alpha to obtain a demodulation pilot frequency reference signal. Where u represents a group number and v represents a sequence number. In general, in order to ensure good correlation of the demodulation pilot reference signal, u ∈ {0,1,2, ·, 29}, and v ∈ {0, 1}, that is, the number of values of the root sequences u and v is limited, so that the expression space of the demodulation pilot reference signal is limited. At the same time, due to the base sequence

Performing the cyclic shift α also affects the correlation of the demodulated pilot reference signal. In the car networking technology of vehicle to anything communication (V2X), a vehicle needs to communicate with anything outside, which means that a V2X system needs a large number of DMRSs different from each other (i.e., mutually uncorrelated), and DMRSs generated based on ZC sequences may have large correlation, and thus, the practical application requirements of the V2X system cannot be met.

As another implementation for generating the DMRS, for a channel designed by a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform, a Pseudo Noise (PN) sequence is used to generate the DMRS. And, the initial value of the PN sequence is related to the demodulation pilot Scrambling Code (SCID) and the cell identifier configured at a higher layer. That is, this method is mainly applied to uplink and downlink communication links between the base station and the terminal device, that is, to a communication scenario configured with a cell identifier. In the V2X system, however, the terminal apparatuses of both communication parties may be in the same cell coverage area, may be in different cell coverage areas, or may be both in coverage areas without mobile networks. If the terminal device is within the coverage area of the non-mobile network, the cell identifier is likely not configured, and thus, the terminal device cannot obtain the DMRS based on the PN sequence and cannot normally communicate.

Disclosure of Invention

The embodiment of the application provides a demodulation pilot signal processing method and device, which can ensure normal communication between terminal devices when no network coverage exists.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, the present application provides a demodulation pilot reference signal generation method, which may be performed by a first terminal device. The first terminal device may be a terminal device, or may be a component (e.g., a system on a chip) in the terminal device. The method comprises the following steps: the first terminal device determines an initial value of a pseudo noise PN sequence according to the channel type and the first information, generates a first demodulation pilot reference signal according to the initial value of the PN sequence, and then sends the first demodulation pilot reference signal to the second terminal device. Wherein the first information comprises one or more of an identification of the first terminal device, system time information and a broadcast number index.

According to the method for generating the demodulation pilot reference signal, the first terminal device determines an initial value of a PN sequence according to the channel type and the first information, generates the first demodulation pilot reference signal according to the initial value of the PN sequence, and sends the first demodulation pilot reference signal to the second terminal device. Wherein the first information comprises one or more of an identification of the first terminal device, system time information and a broadcast number index. Compared with the prior art, the generation process of the demodulation pilot frequency reference signal is suitable for the scene of configuring the cell identifier, the initial value of the demodulation pilot frequency reference signal is related to the demodulation pilot frequency scrambling code and the cell identifier configured at the high level, the demodulation pilot frequency reference signal can not be generated for the terminal device in the region without configuring the cell identifier, and the direct communication between the two terminal devices can not be ensured. The method for generating a demodulation pilot reference signal according to the embodiment of the present application determines an initial value of a PN sequence by combining different first information in different channel types, and further generates a first demodulation pilot reference signal sent to a second terminal device, where the first information includes one or more of an identifier of the first terminal device, system time information, and a broadcast frequency index. It can be seen that the used first information is irrelevant to the demodulation pilot scrambling code and the cell identifier configured by the higher layer, and the demodulation pilot reference signal can be normally generated even if the first terminal device and the second terminal device are not in the region configured with the cell identifier.

In one possible design, the channel type is a data channel, and the system time information includes first system time information including an identification of the first terminal device and the first system time information.

The first terminal device determines an initial value of a pseudo noise PN sequence according to a channel type and first information, and comprises:

the first terminal device determines an initial value of a pseudo noise PN sequence according to the identification of the first terminal device and the first system time information; or

The first terminal device determines an initial value of a PN sequence according to the identifier of the first terminal device, the first system time information and the configuration information of a demodulation pilot frequency reference signal; the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of the demodulation pilot reference signals included in each transmission time slot and the positions of the demodulation pilot reference signals, and the configuration information of the demodulation pilot reference signal is information of network configuration or information prestored by the first terminal device.

In this way, the first terminal device determines the initial value of the first demodulation pilot reference signal of the data channel based on the identifier of the first terminal device and the first system time information, and the first demodulation pilot reference signals corresponding to the data channels generated by each first terminal device can be different from each other. Therefore, the discrimination of the first demodulation pilot reference signals corresponding to the data channels of different terminal devices is improved, and the interference among different terminal devices is further reduced.

In one possible design, the method for generating a demodulation pilot reference signal provided by the present application further includes:

the first terminal device obtains the check information of the control information from the control channel, and determines the identifier of the first terminal device according to the check information of the control information, or

The first terminal device obtains the identifier of the first terminal device from the control information, or

The first terminal device prestores an identifier of the first terminal device.

In one possible design, the channel type is a control channel, the first information includes system time information, and the system time information includes first system time information and second system time information.

the first terminal device determines an initial value of a PN sequence according to first system time information and second system time information, wherein the first system time information is time information represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols, and the second system time information is system time information when the first terminal device and the second terminal device are in a synchronous state represented by frame information and/or subframe information.

Here, the first terminal device determines an initial value of a PN sequence based on the system time information, generates a first demodulation pilot reference signal of a control channel, and transmits the first demodulation pilot reference signal to the second terminal device. After the second terminal device receives the first demodulation pilot reference signal from the different first terminal device control channel, the subframe number and/or frame number of the different first demodulation pilot reference signal may be known. If the subframe number and/or frame number of a certain first demodulation pilot reference signal is the same as the subframe number and/or frame number of the second terminal device, the sender of the first demodulation pilot reference signal is synchronous with the second terminal device. In this way, the second terminal device can determine the first terminal device synchronized with itself from among the plurality of first terminal devices. The discrimination of the first demodulation pilot reference signal of the control channel of the synchronization source (the first terminal device) is improved, and the interference is reduced.

In one possible design, the channel type is a broadcast channel, and the first information includes an identification of the first terminal device and an index of the number of broadcasts.

the first terminal device determines an initial value of the pseudo noise PN sequence according to the identification of the first terminal device and a broadcast number index, wherein the broadcast number index represents an index of the number of times of broadcasting the information by the broadcast channel in a preset time period.

In this way, the second terminal device determines the initial value of the second demodulation pilot reference signal of the broadcast channel based on the identifier and the broadcast frequency index of the first terminal device, and further provides information support for the local terminal to generate the second demodulation pilot reference signal.

In a second aspect, the present application provides a demodulation pilot reference signal generation method, which may be performed by a second terminal device. The second terminal device may be a terminal device, or may be a component (e.g., a system on a chip) in the terminal device. The method comprises the following steps: the second terminal device determines an initial value of the pseudo noise PN sequence according to the channel type and the first information, and generates a second demodulation pilot reference signal according to the initial value of the PN sequence. Wherein the first demodulation pilot reference signal and the second demodulation pilot reference signal are both used for channel estimation. Wherein the first information includes one or more of an identification of the first terminal device, system time information, and a broadcast number index, and the first terminal device is a terminal device that transmits the first demodulation pilot reference signal to the second terminal device.

The second terminal device determines an initial value of a pseudo noise PN sequence according to the channel type and the first information, and comprises:

the second terminal device determines an initial value of the PN sequence according to the identifier of the first terminal device and the first system time information; or

The second terminal device determines the initial value of the PN sequence according to the identification of the first terminal device, the first system time information and the configuration information of the demodulation pilot frequency reference signal; the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of the demodulation pilot reference signals included in each transmission time slot and the positions of the demodulation pilot reference signals, and the configuration information of the demodulation pilot reference signal is information of network configuration or information prestored by the second terminal device.

In one possible embodiment, the second terminal device may further perform the following steps:

the second terminal device obtains the check information of the control information from the control channel, and determines the identifier of the first terminal device according to the check information of the control information, or

The second terminal device obtains the identification of the first terminal device from the control information, or

The second terminal device prestores the identification of the first terminal device.

the second terminal device determines an initial value of the pseudo noise PN sequence according to first system time information and second system time information, wherein the first system time information is time information represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols, and the second system time information is system time information when the first terminal device and the second terminal device are in a synchronous state represented by frame information and/or subframe information.

The second terminal device determines an initial value of the pseudo noise PN sequence according to the channel type and the first information, and may specifically implement the following steps: the second terminal device determines an initial value of the PN sequence based on the identifier of the first terminal device and a broadcast number index indicating an index of the number of times the broadcast channel broadcasts the message in a predetermined time period.

In a third aspect, the present application provides a demodulation pilot reference signal generating apparatus, which may be the first terminal apparatus in the first aspect. The apparatus includes a processor, a transmitter, a receiver, and a memory. A processor for determining an initial value of a pseudo-noise PN sequence according to a channel type and first information, the first information including one or more of an identification of the first terminal device, system time information and a broadcast number index; generating a first demodulation pilot frequency reference signal according to the initial value of the PN sequence; a transmitter for transmitting the first demodulation pilot reference signal to the second terminal device.

A processor for determining an initial value of a pseudo-noise PN sequence based on a channel type and first information, comprising: an initial value for determining a pseudo-noise PN sequence based on the identity of the first terminal device and the first system time information; or

Determining an initial value of a PN sequence according to the identification of the first terminal device, the first system time information and the configuration information of the demodulation pilot reference signal; the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of the demodulation pilot reference signals included in each transmission time slot and the positions of the demodulation pilot reference signals, and the configuration information of the demodulation pilot reference signal is information of network configuration or information pre-stored in a memory.

In one possible design, the processor may be configured to control the receiver to obtain check information of the control information from a control channel; determining the identity of the first terminal device on the basis of the check information of the control information, or

For controlling the receiver to retrieve the identity of the first terminal device from the control information, or

For controlling the memory to pre-store the identity of the first terminal device.

A processor for determining an initial value of a pseudo-noise PN sequence based on a channel type and first information, comprising: the method comprises the steps of determining an initial value of a PN sequence according to first system time information and second system time information, wherein the first system time information is time information represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols, and the second system time information is system time information represented by frame information and/or subframe information when a first terminal device and a second terminal device are in a synchronous state.

The processor is configured to determine an initial value of the pseudo noise PN sequence according to the channel type and the first information, and may specifically be implemented as: an initial value for the pseudo-noise PN sequence is determined from an identity of the first terminal device and a broadcast times index, the broadcast times index representing an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

In a fourth aspect, the present application provides a demodulation pilot reference signal generating apparatus, which may be the second terminal apparatus in the second aspect. The apparatus includes a processor, a receiver, and a memory. Specifically, the apparatus includes a processor configured to determine an initial value of a pseudo noise PN sequence according to a channel type and first information, the first information including one or more of an identifier of a first terminal apparatus, system time information, and a broadcast number index, the first terminal apparatus being a terminal apparatus that transmits a first demodulation pilot reference signal to a second terminal apparatus; and generating a second demodulation pilot reference signal according to the initial value of the PN sequence, wherein the first demodulation pilot reference signal and the second demodulation pilot reference signal are both used for channel estimation.

A processor for determining an initial value of a pseudo-noise PN sequence based on a channel type and first information, comprising: an initial value for the PN sequence is determined based on the identity of the first terminal device and the first system time information; or

In one possible design, a receiver to obtain check information of the control information from a control channel;

a processor for determining the identity of the first terminal device based on the verification information of the control information, or

A receiver for obtaining the identity of the first terminal device from the control information, or

A memory for pre-storing an identification of the first terminal device.

A processor for determining an initial value of a pseudo-noise PN sequence based on a channel type and first information, comprising: the method comprises the steps of determining an initial value of a pseudo noise PN sequence according to first system time information and second system time information, wherein the first system time information is time information represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols, and the second system time information is system time information when a first terminal device and a second terminal device are in a synchronous state represented by frame information and/or subframe information.

A processor for determining an initial value of a pseudo-noise PN sequence based on a channel type and first information, comprising: an initial value for the PN sequence is determined based on the identity of the first terminal device and a broadcast times index, the broadcast times index representing an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

In a fifth aspect, the present application provides a demodulation pilot reference signal generating apparatus, configured to implement the function of the first terminal apparatus in the above first aspect, or to implement the function of the second terminal apparatus in the above second aspect.

In a sixth aspect, an embodiment of the present application provides a demodulation pilot reference signal generation apparatus having a function of implementing the demodulation pilot reference signal generation method in any one of the above aspects. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a seventh aspect, an apparatus for generating a demodulation pilot reference signal is provided, including: a processor and a memory; the memory is used for storing computer-executable instructions, and when the demodulation pilot reference signal generation device is operated, the processor executes the computer-executable instructions stored by the memory, so that the demodulation pilot reference signal generation device executes the demodulation pilot reference signal generation method according to any one of the above aspects.

In an eighth aspect, a demodulation pilot reference signal generating apparatus is provided, including: a processor; the processor is configured to be coupled to the memory, and after reading the instructions in the memory, execute the method for generating a demodulation pilot reference signal according to any one of the above aspects.

A ninth aspect provides a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform the demodulation pilot reference signal generation method of any one of the above aspects.

A tenth aspect provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the demodulation pilot reference signal generation method of any of the above aspects.

In an eleventh aspect, there is provided circuitry comprising processing circuitry configured to perform the demodulation pilot reference signal generation method of any of the above aspects.

In a twelfth aspect, a chip is provided, where the chip includes a processor, the processor is coupled to a memory, and the memory stores program instructions, and when the program instructions stored in the memory are executed by the processor, the method for generating a demodulation pilot reference signal according to any one of the above aspects is implemented.

In a thirteenth aspect, a communication system is provided, the communication system comprising the first terminal apparatus in any of the above aspects and the second terminal apparatus in any of the above aspects.

For technical effects brought by any one of the design manners in the second aspect to the thirteenth aspect, reference may be made to technical effects brought by different design manners in the first aspect, and details are not repeated here.

Drawings

Fig. 1 is a schematic view of an application scenario of a V2X system according to an embodiment of the present application;

fig. 2 is a schematic system diagram of communication between two terminal devices according to an embodiment of the present application;

fig. 3 is a schematic view of a communication scenario between two terminal devices according to an embodiment of the present application;

fig. 4 is a flowchart of a method for generating a demodulation pilot reference signal according to an embodiment of the present disclosure;

fig. 5 is a flowchart of a method for generating a demodulation pilot reference signal of a data channel according to an embodiment of the present application;

fig. 6 is a flowchart of a method for generating a demodulation pilot reference signal of a data channel according to an embodiment of the present disclosure;

fig. 7 is a flowchart of a method for generating a demodulation pilot reference signal of a control channel according to an embodiment of the present application;

fig. 8 is a flowchart of a method for generating a demodulation pilot reference signal of a broadcast channel according to an embodiment of the present disclosure;

fig. 9 is a flowchart of a data channel information transmission method according to an embodiment of the present application;

fig. 10 is a flowchart of a data channel information transmission method according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a demodulation pilot reference signal generating apparatus for a data channel according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a demodulation pilot reference signal generating apparatus for a data channel according to an embodiment of the present application.

Detailed Description

The terms "first" and "second" and the like in the description and drawings of the present application are used for distinguishing different objects or for distinguishing different processes for the same object, and are not used for describing a specific order of the objects. Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The embodiment of the application can be applied to a system for communication between terminal devices, such as a V2X communication system and a device-to-device (D2D) system. Next, a communication system to which the embodiment of the present application is applied will be described by taking the V2X communication system as an example. Referring to fig. 1,2 and 3, the communication system includes at least two terminal apparatuses, between which communication can be directly performed via a Sidelink (SL) (only two terminal apparatuses are shown in each of fig. 1,2 and 3). Optionally, the communication system further includes an access network device. The terminal device may also communicate with the access network equipment.

The V2X communication system may have the following communication scenarios: communication between vehicles (vehicle to vehicle, V2V), communication between vehicles and infrastructure devices (V2I), communication between vehicles and application servers (V2N), communication between vehicles and pedestrian mobile terminals (V2P), and the like. In the V2X communication system, terminal apparatuses directly communicate with each other via Sidelink (SL), and there is no uplink or downlink communication link without a transmission/reception process of access network equipment.

Among them, the terminal device is mainly used for receiving or transmitting data. Optionally, the terminal device referred to in the embodiments of the present application may be a device or a component in a device implementing the terminal function, for example, the terminal device includes, for example and without limitation, various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, which have a wireless communication function; and may also include subscriber units (subscriber units), cellular phones (cellular phones), smart phones (smart phones), wireless data cards, Personal Digital Assistants (PDAs), tablet computers, handheld devices (handrails), laptop computers (laptop computers), Machine Type Communication (MTC) terminals (terminals), User Equipment (UE), mobile terminals, and the like. For another example, the terminal device may be a component in any of the above devices (for example, the terminal device may refer to a system-on-chip in any of the above devices). In some embodiments of the present application, a terminal device may also be referred to as a terminal, which is described herein in a unified manner and is not described in detail below.

The access network equipment related to the embodiment of the application is a device deployed in a radio access network to provide a wireless communication function. Alternatively, the access network device may refer to a device that communicates with the wireless terminal through one or more cells on an air interface of the access network, where the device that implements the function of the access network device may be the access network device, or may be a device (such as a chip in the access network device) that supports the access network device to implement the function. Optionally, the access network device may perform attribute management on the air interface. The base station device may also coordinate management of attributes for the air interface. The access network device includes various forms of macro base stations, micro base stations (also referred to as small stations), relay devices such as relay stations or chips of the relay devices, Transmission Reception Points (TRPs), evolved Node bs (enbs), next generation network nodes (g Node bs, gnbs), evolved Node bs (ng-enbs) connected to next generation core networks, and the like. Or, in a distributed base station scenario, the access network device may be a Base Band Unit (BBU) and a Remote Radio Unit (RRU), and in a Cloud Radio Access Network (CRAN) scenario, the access network device may be a base band pool (BBU pool) and an RRU.

Referring to fig. 1,2, and 3, for two terminal devices (UE1 and UE2) employing sidelink communication, there may be three communication scenarios: first, two terminal devices (UE1 and UE2) are both within the coverage of the same Public Land Mobile Network (PLMN) (e.g., PLMN1), as shown in fig. 1; second, only one terminal device (UE1) is in the coverage of a Public Land Mobile Network (PLMN) (e.g., PLMN1), and the other terminal devices (UE2) are out of the coverage of the Public Land Mobile Network (PLMN) (PLMN1), as shown in fig. 2; third, both terminal devices (UE1 and UE2) are outside the coverage of a Public Land Mobile Network (PLMN) (e.g., PLMN1), and the area where both terminal devices are located has no preconfigured cell id, as shown in fig. 3. Wherein the dashed oval areas in fig. 1,2 and 3 each represent the coverage of the PLMN 1. Since the two terminal devices communicate with each other by using the sidelink, the communication can be performed normally regardless of whether the two terminal devices are simultaneously within the coverage of the PLMN.

When two terminal apparatuses communicate with each other via a Sidelink (SL), each terminal apparatus needs to generate a demodulation pilot reference signal (DMRS). There are two methods for generating DMRS in the related art.

A first method of generating a DMRS: in a discrete fourier transform orthogonal frequency division multiplexing (DFT-OFDM) waveform design of a low peak-to-average ratio (PAPR), a demodulation pilot reference signal is generated based on a ZC sequence. Wherein the base sequence of the demodulation pilot reference signal

The generation process is as follows:

wherein u belongs to {0,1,2, · · ·, 29}, represents a group number, v belongs to {0, 1}, represents an intra-group sequence number, and M belongs to {0, 1}, a group sequence number, and a group sequence number_SCIndicating the sequence length, N, of the demodulation pilot reference signal_ZCRepresents less than M_SCThe largest prime number.

Indicating the rounding-down operator.

Para base sequence

Performing cyclic shift alpha to obtain demodulation pilot frequency reference signal based on base sequence

Obtaining a demodulation pilot referenceThe signal process satisfies the following formula:

where δ represents a subcarrier spacing configuration and α represents a cyclic shift.

In summary, when obtaining the demodulation pilot reference signal based on the ZC sequence, three parameters are required: u, v, α. The value ranges of u and v are limited, so that good correlation between demodulation pilot frequency reference signals is guaranteed. Thus, the expression space of the demodulation pilot reference signal generated based on the u and v with limited values is limited. When a large number of terminal apparatuses communicate with each other, the demodulation pilot reference signal needs to have a larger expression space. Therefore, the method of obtaining the demodulation pilot reference signal based on the ZC sequence cannot be applied to a scenario where a large number of terminal apparatuses perform communication.

A second method of generating a DMRS: in cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform design, a demodulation pilot reference signal is generated using a PN sequence. The generation process meets the following formula:

where r (n) represents the demodulation pilot reference signal, and c (n) represents the PN sequence.

The generation process of the PN sequence c (n) satisfies the following formula:

C(n)＝(x₁(n+N_c)+x₂(n+N_c))mod2 (7)

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2 (8)

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2 (9)

wherein N is_c＝1600，x₁(n) and x₂(n) represents two m-sequences (a PN sequence). Each m sequence31 initial values are required.

x₁The initial value of (n) is a fixed value. x is the number of₁(0)＝1，x₁(n)＝0，n＝1,2，...，30。

x₂The initial value of (n) satisfies the following formula:

wherein, c_initDenotes x₂(n) initial value. While in different channel types, x₂Initial value of (n) (i.e. c)_init) The calculation formulas that are satisfied are different.

Specifically, in a New Radio (NR) uplink data channel, x₂Initial value of (n) (i.e. c)_init) The following formula is satisfied:

wherein,

indicating the number of symbols in each slot,

denotes a slot index of one radio frame, l denotes an index of a symbol where a pilot reference signal is demodulated in one slot,

uplink demodulation pilot Scrambling Code Identification (SCID), n, representing high-level configuration_SCIDE {0,1 }. Configuring x at a higher layer₂(n) when an initial value of (n) or Downlink Control Information (DCI) schedules Physical Uplink Shared Channel (PUSCH) transmission, n_SCID1. In other cases, n_SCID＝0。

Thus, for a certain terminal device, if

It is known that m-sequence initial values used in different time slots and different symbols are different, and then demodulation pilot reference signals with discrimination are generated.

Specifically, in the New Radio (NR) downlink control channel, x₂Initial value of (n) (i.e. c)_init) The following formula is satisfied:

wherein,

indicating the slot index of a radio frame, l indicating the index of the symbol in which the pilot reference signal is demodulated in a slot, N_IDEpsilon {0,1, …, 65535} represents the control channel demodulation pilot scrambling code identification configured by the higher layer. If N is not configured_IDAnd may be replaced by a cell ID, in which case,

in particular, in a New Radio (NR) broadcast channel, x₂Initial value of (n) (i.e. c)_init) The following formula is satisfied:

wherein,

a cell representation of a currently transmitted broadcast signal representing a higher level configuration. L represents the maximum number of times the signal is broadcast within a preset time period.

When the L is equal to 4,

wherein,n_hfrepresenting a field indication. n is_hf0, indicating that the broadcast signal is transmitted in the first half frame of the current radio frame; n is_hf1 indicates that the broadcast signal is transmitted in the second half of the current radio frame. i.e. i_SSBThe lowest two bits representing the index of the number of times the signal is broadcast within a period.

When L-8 or L-64,

wherein i_SSBRepresenting the lowest three bits of the index of the number of times the signal is broadcast within a period.

In summary, in the process of acquiring the demodulation pilot reference signal based on the PN sequence, an initial value of the PN sequence needs to be acquired, and the initial value of the PN sequence is related to a demodulation pilot Scrambling Code (SCID) configured at a higher layer and a cell identifier (cell id), that is, the method for generating the demodulation pilot reference signal by using the PN sequence is mainly applied to an uplink and downlink communication scenario between the base station and the terminal device. For two terminal devices in direct communication, there may be a situation where one terminal device is located within a coverage of a Public Land Mobile Network (PLMN) and the other terminal device is located outside the coverage of the Public Land Mobile Network (PLMN), as shown in fig. 2, or a situation where both terminal devices are located outside the coverage of the Public Land Mobile Network (PLMN), as shown in fig. 3. In the two scenarios shown in fig. 2 and fig. 3, in the process of generating the DMRS, the terminal device cannot determine the initial value of the PN sequence because it cannot acquire the demodulation pilot Scrambling Code (SCID) and the cell identifier configured in the higher layer, that is, cannot acquire x₂Further, (n) the initial value of the m-sequence (a kind of PN sequence) cannot generate a DMRS, and normal communication between terminal devices is affected.

The embodiment of the application provides a method for generating a demodulation pilot reference signal, which is applied to the process of generating the demodulation pilot reference signal by a terminal device. The terminal devices can communicate with each other by adopting a sidelink.

Next, a method for generating DMRSs by the first terminal device and the second terminal device will be described, taking as an example the case where the first terminal device transmits information to the second terminal device. With reference to fig. 4, a first terminal device serves as a transmitting end, and a DMRS generation method according to an embodiment of the present application includes the following steps:

s401, the first terminal device determines an initial value of the PN sequence according to the channel type and the first information.

The channel type may include a data channel, a control channel, and a broadcast channel, among others.

The first information includes one or more of an identification of the first terminal device, system time information, and a broadcast number index. The first terminal device may obtain the identifier of the first terminal device from the control information of the control channel, may obtain the identifier of the first terminal device from the verification information of the control information, and may store the identifier of the first terminal device in advance. The system time information includes first system time information and second system time information, the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship of time slots and time domain symbols, the second system time information represents the system time information when the first terminal device and the second terminal device are in a synchronous state, and exemplary parameters capable of representing the system time information include, but are not limited to, a frame number and a subframe number. The broadcast number index indicates an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

For different channel types, the first terminal device determines an initial value of the PN sequence with reference to different first information. The channel type includes, but is not limited to, a data channel, a control channel, and a broadcast channel.

Specifically, when the channel type is a data channel, the system time information includes first system time information, and the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship between a time slot and a time domain symbol. The first information includes an identification of the first terminal device and first system time information.

For a scenario where the channel type is a data channel, referring to fig. 5 or fig. 6, the first terminal device can obtain the identifier of the first terminal device from the check information of the control information, and a specific implementation process thereof may include the following steps:

s40110, the first terminal device obtains the check information of the control information from the control channel.

Wherein the verification information comprises information for generating an identification of the first terminal device.

Illustratively, the check information may be a Cyclic Redundancy Check (CRC). Some bits, such as the first 24 bits, in the CRC check information carry the identity of the first terminal device. The first terminal device demodulates and decodes the information transmitted by the control channel, and then obtains CRC check information.

S40111, the first terminal device determines the identifier of the first terminal device according to the verification information of the control information.

For example, taking the example that the identifier of the first terminal device is determined based on the cyclic redundancy check code, and the first 24 bits in the CRC check code carry the identifier of the first terminal device, the identifier of the first terminal device satisfies the following formula:

wherein N is_IDDenotes the identity of the first terminal device, k denotes the index of the bit in the cyclic redundancy check code used to carry the identity of the first terminal device, c_kRepresenting the part of the first terminal device identity carried by the bits with index k.

In this way, the first terminal device acquires the identity of the first terminal device for determining the initial value of the PN sequence based on the check information of the control information transmitted by the control channel.

In a scenario that the channel type is a data channel, the number of first demodulation pilot reference signals corresponding to the data channel is not changed. Referring to fig. 5, when the channel type is a data channel, the specific implementation process of S401 may include:

s40112, the first terminal device determines an initial value of the PN sequence according to the identifier of the first terminal device and the first system time information. The first system time information is represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols.

At this time, the initial value of the PN sequence satisfies the following formula:

wherein,

indicating the number of time domain symbols in each slot,

indicating the slot index of the first demodulation pilot reference signal in a radio frame, l indicating the index of the time domain symbol in which the first demodulation pilot reference signal is located in a slot, N_IDRepresenting the identity of the first terminal device. The first DMRS is a DMRS generated by the first terminal device, and similarly, the second DMRS is a DMRS generated by the second terminal device hereinafter.

It should be noted that one demodulation pilot reference signal may occupy one or more time domain symbols, and in the embodiment of the present application, an example in which one demodulation pilot reference signal occupies one time domain symbol is mainly used for description.

When multiple time domain symbols can be occupied by one demodulation pilot reference signal, the first time domain symbol index in the multiple time domain symbols is taken as l in equation (14).

In another scenario where the channel type is a data channel, the number of first demodulation pilot reference signals corresponding to the data channel is variable. Referring to fig. 6, a specific implementation process of S401 may include:

s40113, the first terminal device determines an initial value of the PN sequence according to the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal.

The identifier of the first terminal device may be referred to above, and is not described herein again. The configuration information of the demodulation pilot reference signal comprises: the number of demodulation pilot reference signals included in each transmission slot, and the location of the number of demodulation pilot reference signals. The configuration information may be stored in the first terminal device in advance, or may be configured by the access network device and then sent to the first terminal device. Illustratively, the configuration information of the demodulation pilot reference signal includes one or more pilot configuration indexes. Each pilot configuration index corresponds to the number of demodulation pilot reference signals included in each transmission slot and the position of each demodulation pilot reference signal in one transmission slot. Table 1 shows one possible implementation of configuration information.

TABLE 1

Wherein n is_DMRS-indexDenotes the pilot configuration index,/₀An index indicating a first time domain symbol in one transmission slot. Referring to table 1, taking an example that one demodulation pilot reference signal occupies one time domain symbol, when the pilot configuration index n_DMRS-indexWhen the number is 0, the number of first demodulation pilot reference signals (i.e. demodulation pilot reference signals generated by the first terminal) contained in each transmission slot is 1, and the time domain symbol index of the first demodulation pilot reference signal in one transmission slot isl₀(i.e. |)₀+0). Pilot configuration index n_DMRS-indexWhen the number of the first demodulation pilot reference signals is 1,2 first demodulation pilot reference signals are included in one slot, and time domain symbol indexes of the two included first demodulation pilot reference signals in the slot are respectively expressed as: l₀+0 and l₀+7. Pilot configuration index n_DMRS-indexWhen the number is 3, the number of the first demodulation pilot reference signals contained in each transmission slot is 4, and the time domain symbol indexes of the 4 first demodulation pilot reference signals in one transmission slot are respectively represented as l₀、l₀+5、l₀+8 and l₀+11. At this time, the first terminal device may select a certain pilot configuration index from the configuration information according to the actual application requirement, and accordingly determine the number of the first demodulation pilot reference signals included in each transmission timeslot and the positions of the number of the first demodulation pilot reference signals, so as to obtain the initial value of the PN sequence.

wherein,

indicating the number of time domain symbols in each slot,

indicating the slot index of the first demodulation pilot reference signal in a radio frame, l indicating the index of the time domain symbol in which the first demodulation pilot reference signal is located in a slot, N_IDIndicating the identity of the first terminal device in the data channel, N_DMRSIndicating the number of first demodulation pilot reference signals, N, contained in a transmission slot_index∈{0,1,2，…，N_DMRS-1, representing the index of the first demodulated pilot reference signal in a transmission slot. In one frame structure, the index of the first demodulation pilot reference signal is sequentially increased from left to right.

In this way, the first terminal device determines an initial value of the first demodulation pilot reference signal corresponding to the data channel based on the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal. For the same first terminal device, the different initial values correspond to different first pilot numbers, i.e. the first demodulation pilot reference signal transmittable in one time slot, for example, referring to table 1, when the PN sequence has a certain initial value, it corresponds to n_DMRS-indexTo 1, accordingly, one slot may transmit 2 first demodulation pilot reference signals. And different initial values correspondingly generate different first demodulation pilot reference signals. Therefore, after the second terminal device receives a certain first demodulation pilot reference signal, the first pilot quantity corresponding to the first demodulation pilot reference signal, that is, the number of the first demodulation pilot reference signals that can be transmitted in one time slot, can be known. This is equivalent to that, the first demodulation pilot reference signal may implicitly indicate the number of the first pilots, and further, the number of the first pilots does not need to be displayed and carried separately through the control information, thereby reducing the length of the control information and saving the spectrum resources.

When the channel type is a control channel, the first information includes system time information, and the system time information includes first system time information and second system time information. As a possible implementation manner, the slot index, the time domain symbol index, and the number configuration relationship between the slot and the time domain symbol can represent the first system time information, and the frame information and the subframe information can represent the second system time when the first terminal device and the second terminal device are in a synchronous state. Referring to fig. 7, a specific implementation process of S401 may include:

s4013, the first terminal device determines an initial value of the PN sequence according to the first system time information and the second system time information.

The first system time information is represented by a time slot index, a time domain symbol index, and a number configuration relationship between a time slot and a time domain symbol, and the second system time information is represented by frame information and/or subframe information, and is the system time information when the first terminal device and the second terminal device are in a synchronous state.

For example, the frame information may be a frame number, and the subframe information may be a subframe number.

When the first terminal device determines the initial value of the PN sequence based on the system time information, at least one of the following three methods may be employed:

the first method is as follows: the first terminal device determines an initial value of the PN sequence based on the first system time information and frame information (e.g., frame number).

wherein,

indicating the number of time domain symbols in each slot,

indicating the slot index of the first demodulation pilot reference signal in a radio frame, l indicating the index of the time domain symbol in which the first demodulation pilot reference signal is located in a slot, N_fIndicating the frame number when the first terminal device and the second terminal device are in a synchronized state.

The second method comprises the following steps: the first terminal device determines an initial value of the pseudo noise PN sequence based on the first system time information and subframe information (e.g., subframe number).

wherein,

indicating the number of time domain symbols in each slot,

indicating the slot index of the first demodulation pilot reference signal in a radio frame, l indicating the index of the time domain symbol in which the first demodulation pilot reference signal is located in a slot, n_fIndicating the subframe number when the first terminal device and the second terminal device are in a synchronized state.

The third method comprises the following steps: the first terminal device determines an initial value of the pseudo-noise PN sequence based on the first system time information, the frame information (e.g., frame number), and the subframe information (e.g., subframe number).

wherein,

indicating the number of time domain symbols in each slot,

indicating the slot index of a radio frame, l indicating the index of the time domain symbol in which the first demodulation pilot reference signal is located in a slot, N_fIndicating the frame number, n, of the first terminal device in synchronization with the second terminal device_fIndicating the subframe number when the first terminal device and the second terminal device are in a synchronized state.

Here, the first terminal device determines an initial value of a PN sequence based on the system time information, generates a first demodulation pilot reference signal of a control channel, and transmits the first demodulation pilot reference signal to the second terminal device. After the second terminal device receives the first demodulation pilot reference signal from the different first terminal device control channel, the subframe number and/or frame number of the different first demodulation pilot reference signal may be known. If the subframe number and/or frame number of a certain first demodulation pilot reference signal is the same as the subframe number and/or frame number of the second terminal device, the sender of the first demodulation pilot reference signal is synchronous with the second terminal. In this way, the second terminal device can determine the first terminal device synchronized with itself from among the plurality of first terminal devices. The discrimination of the first demodulation pilot reference signal of the control channel of the synchronization source (the first terminal device) is improved, and the interference is reduced.

Specifically, when the channel type is a broadcast channel, the first information includes an identifier of the first terminal apparatus and a broadcast number index. Referring to fig. 8, a specific implementation process of S401 may include:

s4014, the first terminal device determines an initial value of the PN sequence according to the identifier of the first terminal device and the broadcast number index.

Wherein the identity of the first terminal device comprises the identity of the first terminal device in the synchronization channel.

The broadcast number index indicates an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

wherein,

indicating the identity of the first terminal device in the synchronization channel, i_SSBAn index representing the number of times the broadcast channel broadcasts a message within a predetermined time period.

Mod is the modulus operator for the round-down operator. The time period may be a preconfigured parameter, such as a parameter configured by the access network device.

As such, each time the broadcast number index of the broadcast message is different, the initial value of the PN sequence based on the broadcast number index is different, and further, the first demodulation pilot reference signal generated from the initial value of the PN sequence is different. Therefore, the expression space of the first demodulation pilot reference signal of the broadcast channel is expanded, the identifiability of the first demodulation pilot reference signal of the broadcast channel of different terminal devices is improved, and the interference is reduced.

S402, the first terminal device generates a first demodulation pilot reference signal according to the initial value of the PN sequence.

As a possible implementation, when generating the first demodulation pilot reference signal based on the PN sequence, two m sequences (m sequence is a kind of PN sequence) are required, that is, x₁(n) and x₂(n) of (a). Each m-sequence requires 31 initial values. Wherein x is₁The initial value of (n) is a fixed value, i.e. x₁(0)＝1，x₁(n)＝0，n＝1,2，…，30。x₂The initial value of (n) can be determined by S401, and x can be obtained according to the formula (10)₂(n) of (a). Determining two m-sequences x₁(n) and x₂After (n), the first demodulation pilot reference signals of different channel types can be obtained according to the formulas (6) to (9).

S403, the first terminal device transmits the first demodulation pilot reference signal to the second terminal device.

Accordingly, the second terminal device receives the first demodulation pilot reference signal transmitted by the first terminal device to perform channel estimation.

In the method for generating a demodulation pilot reference signal according to the embodiment of the present application, a first terminal device determines an initial value of a PN sequence according to a channel type and first information, generates a first demodulation pilot reference signal according to the initial value of the PN sequence, and sends the first demodulation pilot reference signal to a second terminal device. Wherein the first information comprises one or more of an identification of the first terminal device, system time information and a broadcast number index. Compared with the prior art, the generation process of the demodulation pilot frequency reference signal is suitable for the scene of configuring the cell identifier, the initial value of the demodulation pilot frequency reference signal is related to the demodulation pilot frequency scrambling code and the cell identifier configured at the high level, the demodulation pilot frequency reference signal can not be generated for the terminal in the region without configuring the cell identifier, and the direct communication between two terminal devices can not be ensured. The method for generating a demodulation pilot reference signal according to the embodiment of the present application determines an initial value of a PN sequence by combining different first information in different channel types, and further generates a first demodulation pilot reference signal sent to a second terminal device, where the first information includes one or more of an identifier of the first terminal device, system time information, and a broadcast frequency index. It can be seen that the used first information is irrelevant to the demodulation pilot scrambling code and the cell identifier configured by the higher layer, and the demodulation pilot reference signal can be normally generated even if the first terminal device and the second terminal device are not in the region configured with the cell identifier.

In the process of transmitting information from the first terminal device to the second terminal device, the second terminal device is used as a receiving end, and needs to perform channel estimation to obtain channel information to assist decoding and accurately obtain the information transmitted by the first terminal device. When performing channel estimation, the second terminal device needs two types of demodulation pilot reference signals, that is, a first demodulation pilot reference signal received by the second terminal device and a second demodulation pilot reference signal generated by the second terminal device. Referring to fig. 4, the second terminal apparatus performs the steps of:

s404, the second terminal device determines an initial value of the pseudo noise PN sequence according to the channel type and the first information.

The first information includes one or more of an identification of the first terminal device, system time information, and a broadcast number index. The first terminal device is a terminal device that transmits a first demodulation pilot reference signal to a second terminal device. The second terminal device may acquire the identifier of the first terminal device during communication with the first terminal device, or acquire the identifier of the first terminal device from Sidelink Control Information (SCI) transmitted through a control channel, or acquire the identifier of the first terminal device from Cyclic Redundancy Check (CRC) transmitted through a control channel. The system time information includes first system time information and second system time information, the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship of time slots and time domain symbols, the second system time information represents the system time information when the first terminal device and the second terminal device are in a synchronous state, and exemplary parameters capable of representing the system time information include, but are not limited to, a frame number and a subframe number. The broadcast number index indicates an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

When performing channel estimation on the data channel, it is necessary to use a first demodulation pilot reference signal of the data channel and a second demodulation pilot reference signal of the data channel. Similarly, in channel estimation of a control channel or a broadcast channel, a demodulation pilot reference signal of a corresponding channel type is used.

For a scenario where the channel type is a data channel, referring to fig. 5 or fig. 6, the second terminal device needs to generate a DMRS corresponding to the data channel according to the identifier of the first terminal device, so as to use the DMRS for channel estimation. As a possible implementation manner, the second terminal device obtains the identifier of the first terminal device according to the information transmitted from the control channel, and the specific implementation process includes the following steps:

s40410, the second terminal device acquires the check information of the control information from the control channel.

Wherein the check information of the control information includes information capable of generating the first terminal apparatus identification.

Illustratively, the check information may be a Cyclic Redundancy Check (CRC). Some bits, such as the first 24 bits, in the CRC check information carry the identity of the first terminal device. The second terminal device demodulates and decodes the information transmitted by the control channel, and then obtains CRC check information.

S40411, the second terminal device determines the identifier of the first terminal device according to the check information of the control information.

In this manner, the second terminal device acquires the identity of the first terminal device for determining the initial value of the PN sequence based on the information transmitted by the control channel.

In a scenario that the channel type is a data channel and the number of first demodulation pilot reference signals corresponding to the data channel is not changed. The second terminal device needs to generate a second demodulation pilot reference signal corresponding to the data channel, and the required first information includes the identifier of the first terminal device and the first system time information. Specifically, referring to fig. 5, the specific implementation process of S404 may include:

s40412, the second terminal device determines an initial value of the PN sequence according to the identifier of the first terminal device and the first system time information.

The first system time information is represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols. The specific form of the identifier of the first terminal device adopted by the second terminal device (receiving terminal) needs to be consistent with the specific form of the identifier of the first terminal device adopted by the first terminal device (i.e., transmitting terminal) in S4011. Also, the initial value of the PN sequence also satisfies equation (14).

In this way, the second terminal device determines the initial value of the PN sequence based on the identifier of the first terminal device and the first system time information, and further provides information support for the local terminal to generate the second demodulation pilot reference signal.

In another possible scenario, if the first demodulation pilot reference signal includes a demodulation pilot reference signal corresponding to a data channel, and the number of the first demodulation pilot reference signals corresponding to the data channel is variable. In this case, in one transmission slot, the second terminal device receives one or more first demodulation pilot reference signals to form a first demodulation pilot reference signal set. The second terminal device needs to generate a second demodulation pilot reference signal corresponding to the data channel by combining the configuration information, where the required first information includes the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal, and referring to fig. 6, a specific implementation process of S404 may include:

s40413, the second terminal device determines an initial value of the PN sequence according to the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal.

The first system time information is represented by a time slot index, a time domain symbol index and a quantity configuration relation of time slots and time domain symbols. The configuration information of the demodulation pilot reference signal comprises: the number of first demodulation pilot reference signals included in each transmission slot, and the location of the number of first demodulation pilot reference signals. The configuration information of the demodulation pilot reference signal may be network configured, or pre-stored information by the second terminal device.

When determining the initial value of the PN sequence of the data channel, the specific identifier form of the first terminal device used in S4042 still needs to be consistent with the specific identifier form of the first terminal device used in S4012.

Since the second terminal device cannot acquire the pilot configuration index adopted by the first terminal device when executing S4012, the second terminal device generates the second demodulation pilot reference signals corresponding to all the pilot configuration indexes to form the second demodulation pilot reference signal set. For each second demodulation pilot reference signal, the initial value of the PN sequence also satisfies equation (15).

In this way, the second terminal device determines the initial values of all possible second demodulation pilot reference signals based on the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signals, and further provides information support for the local terminal to generate all possible second demodulation pilot reference signals.

In one possible scenario, if the first demodulation pilot reference signal includes a demodulation pilot reference signal corresponding to a control channel. At this time, the second terminal device generates a second demodulation pilot reference signal corresponding to the control channel, and the required first information includes system time information including the first system time information and the second system time information. As a possible implementation manner, the slot index, the time domain symbol index, and the number configuration relationship between the slot and the time domain symbol can represent the first system time information, and the frame information and the subframe information can represent the second system time when the first terminal device and the second terminal device are in a synchronous state. Referring to fig. 7, a specific implementation process of S404 may include:

s4043, the second terminal device determines an initial value of the PN sequence based on the first system time information and the second system time information.

When determining the initial value of the PN sequence of the control channel, the method used in S4043 needs to be the same as the method used in S4013. For example, in S4013, the initial value of the PN sequence is determined based on the frame number (i.e., in the first mode), and then in S4043, the initial value of the PN sequence is also determined by using the frame number. Also, the initial value of the PN sequence also satisfies equation (16).

In this way, the second terminal device determines an initial value of the second demodulation pilot reference signal of the control channel based on the system time information, and further provides information support for the local terminal to generate the second demodulation pilot reference signal.

In one possible scenario, if the first demodulation pilot reference signal includes a demodulation pilot reference signal corresponding to a broadcast channel. At this time, the second terminal device generates a second demodulation pilot reference signal corresponding to the broadcast channel, and the required first information includes the identifier of the first terminal device and the index of the number of broadcast times, referring to fig. 8, a specific implementation procedure of S404 may include:

s4044, the second terminal device determines an initial value of the PN sequence based on the identifier of the first terminal device and the broadcast number index.

Wherein the identity of the first terminal device comprises an identity of the first terminal device on a synchronization channel.

The broadcast number index indicates an index of the number of times the broadcast channel broadcasts the message within a predetermined time period. The second terminal device pre-acquires the maximum number of times of sending the broadcast message in each time period, or the second terminal device blindly detects the maximum number of times of sending the broadcast message in each time period.

When determining the initial value of the PN sequence of the broadcast channel, the specific form of the identifier of the first terminal device used in S4044 still needs to be consistent with the specific form of the identifier of the first terminal device used in S4014. Also, the initial value of the PN sequence also satisfies equation (19).

S405, the second terminal device generates a second demodulation pilot reference signal according to the initial value of the PN sequence.

The second terminal device needs to be consistent with the process of generating the first demodulation pilot reference signal by the first terminal device.

It should be noted that, if the second demodulation pilot reference signal is a signal generated based on the initial value of the PN sequence determined in S40412, S4043, and S4044, it can be directly used for channel estimation; if the second demodulation pilot reference signal is a signal generated based on the initial value of the PN sequence determined in S4042, the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal under each pilot configuration index needs to be calculated, the pilot configuration index is selected based on the calculated correlation, and the second demodulation pilot reference information corresponding to the pilot configuration index is used for channel estimation, so as to improve the accuracy of channel estimation. Referring to fig. 6, the process of the second terminal device selecting the second demodulation pilot reference signal for channel estimation is as follows:

s406, the second terminal device determines, in the first time slot, a correlation between the first demodulation pilot reference signal in the first time slot and one or more second demodulation pilot reference signals in the first time slot.

Here, the second terminal device determines the time-frequency resource occupied by the data channel according to the pre-acquired control information, further randomly determines the position of the first time slot from the time-frequency resource occupied by the data channel, and calculates the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals in the first time slot.

As already indicated above, the configuration information of the demodulation pilot reference signals can indicate the position of each demodulation pilot reference signal in one time slot. In the configuration information of the demodulation pilot reference signals, if only one row of first demodulation pilot reference signals exists in the data channel, the row of first demodulation pilot reference signals must be mapped to the first pilot symbol of one slot. A column of demodulation pilot reference signals refers to one or more demodulation pilot reference signals along the frequency axis direction. The first column of first demodulation pilot reference signals refers to one or more first demodulation pilot reference signals on the first pilot symbol in one slot.

In the embodiments of the present application, a pilot symbol refers to one or more time domain symbols to which a demodulation pilot reference signal is mapped, and is herein collectively described.

In the configuration information, if there are two or more rows of the first demodulation pilot reference signals in the data channel, there must be one row of the first demodulation pilot reference signals mapped to the first pilot symbol of one slot. That is, for any pilot configuration index, there is a first demodulation pilot reference signal on the first pilot symbol of one slot. Specifically, as shown in Table 1, the index is l₀There is a first demodulation pilot reference signal on the first time domain symbol.

The second terminal device may calculate the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal in at least one of the following ways:

mode 1: when only one column or more than two columns of first demodulation pilot reference signals exist in the data channel, calculating the correlation between the first demodulation pilot reference signal in the first column and the second demodulation pilot reference signal in the first column.

As a possible implementation, for each frequency domain unit of the first column, a correlation between a first demodulation pilot reference signal on the single frequency domain unit in the first column and a second demodulation pilot reference signal on the single frequency domain unit in the first column is calculated. And accumulating the calculated correlations to obtain the correlation between the first demodulation pilot reference signal in the first row and the demodulation pilot reference signal in the first row.

Accordingly, the correlation of the first demodulation pilot reference signal with one or more second demodulation pilot reference signals satisfies the following formula:

wherein h is_iDenotes a first demodulated pilot reference signal on the first pilot symbol of an ith frequency domain element in a slot, I e {1,2, …, I-1, I }, I denotes an index of the frequency domain element, and I is a value determined according to a bandwidth of a data channel and an interval of the frequency domain element. Illustratively, each pilot symbol corresponds to a demodulation pilot reference signal. Illustratively, the frequency domain unit may specifically refer to a frequency domain subcarrier.

Denotes the pilot configuration index as n_DMRS-indexThe conjugate of the second demodulation pilot reference signal on the first pilot symbol of a slot for the ith frequency domain unit.

n_DMRS-indexIndicating a pilot configuration index of a first demodulation pilot reference signal in configuration information, pilot configurationIndex n_DMRS-indexIs used to indicate that: pilot configuration index of n_DMRS-indexThe first demodulation pilot reference signal and the time domain symbol are corresponding in one time slot.

And | | represents the modulo operator.

In this way, the second terminal device can obtain the second demodulation pilot reference signal for channel estimation only according to the correlation between the first demodulation pilot reference signal in the first row and the second demodulation pilot reference signal in the first row, the computation amount is small, and the accuracy of channel estimation is improved.

Mode 2: the second terminal device calculates the correlation between all possible first demodulation pilot reference signals and the second demodulation pilot reference signals.

At this time, the first demodulation pilot reference signal includes a demodulation pilot reference signal on any pilot symbol on the first slot in the first demodulation pilot reference signal set, and the second demodulation pilot reference signal includes a demodulation pilot reference signal on the same pilot symbol as the first demodulation pilot reference signal in the second demodulation pilot reference signal set.

The first demodulation pilot reference signal set represents a set of demodulation pilot reference signals corresponding to a data channel received by a receiving end, and the second demodulation pilot reference signal set represents a set of demodulation pilot reference signals generated based on pilot configuration information.

The correlation of the first demodulation pilot reference signal and one or more second demodulation pilot reference signals can satisfy the following formula:

wherein h is_i,lIndicating the first demodulated pilot reference signal of the ith frequency domain element on the ith time domain symbol of a slot, I ∈ {1, 2., I-1, I }, I indicating the index of the frequency domain element, and I being a value determined according to the bandwidth of the data channel and the interval of the frequency domain element. Each pilot symbol corresponds to a demodulation pilot referenceA signal. Illustratively, the frequency domain unit may specifically refer to a frequency domain subcarrier.

Denotes the pilot configuration index as n_DMRS-indexThe conjugate of the second demodulated pilot signal in the ith time domain symbol of a time slot for the ith frequency domain unit.

n_DMRS-indexIndicating a pilot configuration index of a first demodulation pilot reference signal in configuration information, wherein the pilot configuration index is n_DMRS-indexIs used to indicate that: pilot configuration index of n_DMRS-indexAnd then, in a time slot, the first demodulation pilot reference signal is in the corresponding relation of the pilot symbol and the time domain symbol.

And | | represents the modulo operator.

The correlation of the first demodulation pilot reference signal with one or more second demodulation pilot reference signals can also satisfy the following formula:

wherein h is_i,lDenotes a first demodulated pilot reference signal of an ith frequency domain element on an ith time domain symbol of a slot, I e {1,2, …, I-1, I }, I denotes an index of the frequency domain element, and I is a value determined according to a bandwidth of a data channel and an interval of the frequency domain element. Each pilot symbol corresponds to a demodulation pilot reference signal. Illustratively, the frequency domain unit may specifically refer to a frequency domain subcarrier.

n_DMRS-indexPilot configuration index representing first demodulation pilot reference signal in configuration informationIntroduction is n_DMRS-indexIs used to indicate that: pilot configuration index of n_DMRS-indexAnd then, in a time slot, the first demodulation pilot reference signal is in the corresponding relation of the pilot symbol and the time domain symbol.

And | | represents the modulo operator.

Therefore, the second terminal device calculates the correlation between each first demodulation pilot frequency reference signal and the second demodulation pilot frequency reference signal, improves the accuracy of the correlation calculation result, and further accurately selects the pilot frequency configuration index to obtain the second demodulation pilot frequency reference signal for channel estimation.

And S407, determining a second demodulation pilot reference signal for channel estimation according to the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals.

Wherein the second demodulation pilot reference signal for channel estimation comprises a second demodulation pilot reference signal with the largest correlation.

Illustratively, if the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal is calculated based on equation (20), the second demodulation pilot reference signal for channel estimation satisfies the following equation:

if the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal is calculated based on equation (21), the second demodulation pilot reference signal for channel estimation satisfies the following equation:

if the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal is calculated based on the formula (22), the second demodulation pilot reference signal for channel estimation satisfies the following formula:

in this way, the second terminal device selects the pilot configuration index with the highest correlation calculation result, and uses the second demodulation pilot reference signal corresponding to the pilot configuration index with the highest correlation for channel estimation, so as to improve the accuracy of channel estimation.

Taking the data channel with the unchanged number of the first demodulation pilot reference signals as an example, the following describes the process of the first terminal device sending information (the information carries the first demodulation pilot reference signals) and the second terminal device receiving and decoding the information specifically. Referring to fig. 9, the method includes the steps of:

s901, the first terminal device carries out channel coding on information to be sent.

S902, the first terminal apparatus generates a first demodulation pilot reference signal corresponding to the data channel.

The specific steps executed by the first terminal device are referred to as S40110 to S40112, and S402, which are not described herein again.

The first terminal apparatus may execute S901 and then S902, may execute S902 and then S901, or may execute S901 and then S902 at the same time. The order of S901 and S902 is not limited here.

S903, the first terminal device maps the channel-coded information to be transmitted and the first demodulation pilot reference signal corresponding to the data channel to the time domain resource.

For example, if the number of the first demodulation pilot reference signals included in one transmission slot is 1, the position where the first demodulation pilot reference signal is mapped to the time domain resource is the position where the time domain symbol index is represented as 0 in each transmission slot.

S904, the first terminal apparatus performs Fast Fourier Transform (FFT) and framing on the information of the time domain resource.

Illustratively, a header and a trailer are added to the front and rear parts of the FFT-processed data and encapsulated into a frame, so that the second terminal device can identify the start and end of the frame from the received bit stream according to the header and trailer flags.

S905, the first terminal apparatus transmits the information encapsulated into the frame to the second terminal apparatus.

Accordingly, the second terminal device receives the information that has been encapsulated into a frame from the first terminal device.

S906, the second terminal apparatus performs a deframing process and an Inverse Fast Fourier Transform (IFFT) on the information encapsulated into the frame.

S907, the second terminal device performs channel separation on the information after the fft, and acquires a first demodulation pilot reference signal and data information.

S908, the second terminal apparatus generates a second demodulation pilot reference signal corresponding to the data channel.

The specific steps executed by the second terminal device are referred to as S40410 to S40412, and S405, which are not described herein again.

The second terminal device may perform S907 and then S908, may perform S908 and then S907, or may perform S907 and then S908 at the same time. The order of S907 and S908 is not limited here.

S909, the second terminal device performs channel estimation based on the received first demodulation pilot reference signal and the generated second demodulation pilot reference signal, and obtains a channel estimation result.

S910, the second terminal device decodes the received data information according to the channel estimation result.

Therefore, the first terminal device and the second terminal device can directly communicate, the limitation of the expression space of the demodulation pilot frequency reference signals does not exist, and the discrimination between different demodulation pilot frequency reference signals can be improved.

Taking the data channel with the variable number of the first demodulation pilot reference signals as an example, the following describes the process of sending information (the information carries the first demodulation pilot reference signals) by the first terminal device and receiving and decoding the information by the second terminal device. Referring to fig. 10, the method includes the steps of:

s1001, the first terminal apparatus performs channel coding on information to be transmitted.

S1002, the first terminal apparatus generates a first demodulation pilot reference signal corresponding to the data channel.

Here, specific steps performed by the first terminal apparatus are referred to as S40110, S40111, S40113, and S402, which are not described in detail herein.

S1003, the first terminal device maps the channel-coded information to be transmitted and the first demodulation pilot reference signal corresponding to the data channel to the time domain resource.

Illustratively, index n is configured with the pilots in Table 1_DMRS-indexFor example, the number of the first demodulation pilot reference signals included in one transmission slot is 2, and the positions where the two first demodulation pilot reference signals are mapped to the time domain resource are the time domain symbol indexes in each transmission slot, which are respectively denoted by l₀And l₀The +7 position.

The execution process of S1004 refers to S904, the execution process of S1005 refers to S905, and the execution process of S1006 refers to S906, which are not described herein again.

S1007, the second terminal apparatus generates a second demodulation pilot reference signal corresponding to the data channel.

The specific steps executed by the second terminal device are referred to as S40410, S40411, S40413 and S405, and are not described herein again.

The second terminal apparatus may execute S1006 and then S1007, may execute S1007 and then S1006, or execute S1006 and S1007 at the same time. The order of S1006 and S1007 is not limited here.

And S1008, the second terminal device performs blind detection on the information after the fast Fourier transform according to the generated second demodulation pilot reference signal, and acquires a pilot configuration index adopted by the first terminal device.

Here, the specific steps performed by the second terminal device are referred to as S406 and S407, and are not described herein again.

S1009 performs channel separation on the information after the fft according to the pilot configuration index adopted by the first terminal apparatus, and acquires the first demodulation pilot reference signal and the data information.

S1010, performing channel estimation according to the received first demodulation pilot frequency reference signal and a second demodulation pilot frequency reference signal corresponding to the pilot frequency configuration index, and obtaining a channel estimation result.

The process of S1011 is performed in S910, which is not described herein.

In this way, the first terminal device and the second terminal device can directly communicate, even if the number of the demodulation pilot reference signals in the data channel is variable, the second terminal device can determine the pilot configuration index adopted by the first terminal device, and use the second demodulation pilot reference signal corresponding to the same pilot configuration index for channel estimation, so as to improve the accuracy of channel estimation. In addition, the control information does not need to carry quantity information, the length of the control information is shortened, and the frequency spectrum resource is saved.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between different network elements. It is to be understood that the first terminal device and the second terminal device include hardware structures and/or software modules for performing the respective functions in order to realize the functions. The elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein may be embodied in hardware or in a combination of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present teachings.

In the embodiment of the present application, the demodulation pilot reference signal generation apparatus may be divided into functional units according to the above method examples, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 11 shows a schematic block diagram of a demodulation pilot reference signal generation apparatus provided in an embodiment of the present application. The demodulation pilot reference signal generating apparatus 1100 may be in the form of software, or may be a device or a component in a device (e.g., a system on a chip). The demodulation pilot reference signal generation apparatus 1100 includes: a processing unit 1102 and a communication unit 1103.

The communication unit 1103 may also be divided into a sending unit (not shown in fig. 11) and a receiving unit (not shown in fig. 11). Wherein, the sending unit is configured to support the communication apparatus 1100 to send information to other network elements. A receiving unit for supporting the communication apparatus 1100 to receive information from other network elements.

When the demodulation pilot reference signal generation apparatus 1100 is configured to implement the functions of the first terminal apparatus, the processing unit 1102 may be configured to enable the apparatus 1100 to perform S401, S402 in fig. 4, and/or other processes for the schemes described herein, for example. The communication unit 1103 is used to support communication between the apparatus 1100 and other network elements, e.g. a second terminal apparatus. For example, the communication unit may be configured to enable apparatus 1100 to perform S403 as shown in fig. 4, and/or other processes for the schemes described herein.

When the demodulation pilot reference signal generation apparatus 1100 is used to implement the function of the second terminal apparatus in the above method, the processing unit 1102 may be used to support the apparatus 1100 to perform the processes as S404, S405 in fig. 4, and/or other processes for the schemes described herein, for example. The communication unit 1103 is used to support communication between the apparatus 1100 and other network elements, e.g. the first terminal apparatus. For example, the communication unit may be configured to enable apparatus 1100 to perform S403 as shown in fig. 4, and/or other processes for the schemes described herein.

Optionally, the demodulation pilot reference signal generation apparatus 1100 may further include a storage unit 1101 for storing program codes and data of the apparatus 1100, and the data may include, but is not limited to, original data or intermediate data, and the like.

The processing unit 1102 may be a processor or a controller, such as a CPU, general purpose processor, DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like.

The communication unit 1103 may be a communication interface, a transceiver circuit, or the like, where the communication interface is generally referred to, and in a specific implementation, the communication interface may include a plurality of interfaces, which may include, for example: terminals and interfaces between terminals and/or other interfaces.

The storage unit 1101 may be a memory.

When processing section 1102 is a processor, communication section 1103 is a communication interface, and storage section 1101 is a memory, demodulation pilot reference signal generation apparatus 1200 according to the embodiment of the present application may be as shown in fig. 12.

Referring to fig. 12, the apparatus 1200 includes: a processor 1202, a transceiver 1203, a memory 1201.

The transceiver 1203 may be a separately arranged transmitter, which may be used for transmitting information to other devices, or a separately arranged receiver, which may be used for receiving information from other devices. The transceiver may also be a component that integrates information sending and receiving functions, and the embodiment of the present application does not limit the specific implementation of the transceiver.

Optionally, the apparatus 1200 may also include a bus 1204. The transceiver 1203, the processor 1202, and the memory 1201 may be connected to each other through a bus 1204; the bus 1204 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 1204 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 12, but this is not intended to represent only one bus or type of bus.

Those of ordinary skill in the art will understand that: in the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network devices (e.g., terminals). Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each functional unit may exist independently, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general hardware, and certainly, the present application can also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present application may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods described in the embodiments of the present application.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and all changes and substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for generating a demodulation pilot reference signal, comprising:

the first terminal device determines an initial value of a PN sequence according to the channel type, the identifier of the first terminal device, the first system time information and the configuration information of the demodulation pilot frequency reference signal; the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship between a time slot and a time domain symbol, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals included in each transmission time slot and positions of the demodulation pilot reference signals in the number, the configuration information of the demodulation pilot reference signal is information of network configuration or information prestored by the first terminal device, and the channel type is a data channel;

the first terminal device generates a first demodulation pilot frequency reference signal according to the initial value of the PN sequence;

the first terminal device transmits the first demodulation pilot reference signal to a second terminal device.

2. The demodulation pilot reference signal generation method according to claim 1, wherein said method further comprises:

the first terminal device acquires check information of the control information from the control channel;

the first terminal device determines the identifier of the first terminal device according to the verification information of the control information; or

The first terminal device prestores an identifier of the first terminal device.

3. A method for generating a demodulation pilot reference signal, comprising:

the second terminal device determines the initial value of the PN sequence according to the channel type, the identifier of the first terminal device, the first system time information and the configuration information of the demodulation pilot frequency reference signal; the first system time information is time information represented by a slot index, a time domain symbol index, and a number configuration relationship between a slot and a time domain symbol, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals included in each transmission slot and positions of the number of demodulation pilot reference signals, the configuration information of the demodulation pilot reference signal is information configured by a network or information pre-stored by the second terminal device, the first terminal device is a terminal device that sends a first demodulation pilot reference signal to the second terminal device, and the channel type is a data channel;

and the second terminal device generates a second demodulation pilot reference signal according to the initial value of the PN sequence, wherein the first demodulation pilot reference signal and the second demodulation pilot reference signal are both used for channel estimation.

4. The demodulation pilot reference signal generation method according to claim 3, wherein said method further comprises:

the second terminal device acquires the check information of the control information from the control channel;

the second terminal device determines the identifier of the first terminal device according to the verification information of the control information; or

The second terminal device obtains the identifier of the first terminal device from the control information, or

The second terminal device prestores the identifier of the first terminal device.

5. A demodulation pilot reference signal generation apparatus, comprising:

a memory for pre-storing information;

a processor for determining an initial value of a PN sequence according to a channel type, an identifier of a first terminal device, first system time information, and configuration information of a demodulation pilot reference signal; the first system time information is time information represented by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals included in each transmission time slot and positions of the demodulation pilot reference signals in the number, and the configuration information of the demodulation pilot reference signal is information of network configuration or information prestored in the memory; generating a first demodulation pilot frequency reference signal according to the initial value of the PN sequence, wherein the channel type is a data channel;

a transmitter for transmitting the first demodulation pilot reference signal to a second terminal device.

6. The demodulation pilot reference signal generation apparatus according to claim 5, wherein said apparatus further comprises a receiver;

the processor is used for controlling the receiver to acquire the check information of the control information from the control channel; determining the identity of the first terminal device based on the verification information of the control information, or

For controlling a memory to pre-store an identification of the first terminal device.

7. A demodulation pilot reference signal generation apparatus, comprising:

a memory for pre-storing information;

a processor for determining an initial value of a PN sequence according to a channel type, an identifier of a first terminal device, first system time information, and configuration information of a demodulation pilot reference signal; the first system time information is time information represented by a slot index, a time domain symbol index, and a number configuration relationship between a slot and a time domain symbol, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals included in each transmission slot and positions of the number of demodulation pilot reference signals, the configuration information of the demodulation pilot reference signal is information configured by a network or information pre-stored in the memory, the channel type is a data channel, and the first terminal device is a terminal device that sends the first demodulation pilot reference signal to the second terminal device; and generating a second demodulation pilot reference signal according to the initial value of the PN sequence, wherein the first demodulation pilot reference signal and the second demodulation pilot reference signal are both used for channel estimation.

8. The demodulation pilot reference signal generation apparatus according to claim 7, wherein said apparatus further comprises a receiver;

the receiver is used for acquiring the check information of the control information from the control channel;

the processor is further configured to determine an identifier of the first terminal device according to the verification information of the control information, or

The receiver is further configured to obtain an identifier of the first terminal device from the control information, or

The memory is further configured to pre-store the identifier of the first terminal device.

9. A readable storage medium, characterized by storing a program or instructions which, when executed by a computer, implement the demodulation pilot reference signal generation method according to any one of claims 1 to 2, or implement the demodulation pilot reference signal generation method according to any one of claims 3 to 4.