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

Abstract

The present application provides a method and device for generating a demodulation pilot reference signal, which relate to the field of communication technologies, especially V2X, intelligent driving, intelligent networked vehicles, automatic driving or Internet of Vehicles, etc., which can solve the problem of communication terminal devices when there is no network coverage. The problem of not being able to communicate normally. The method includes: the first terminal device determines the initial value of the 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 sends the first demodulation pilot signal to the second terminal device. A demodulated pilot reference signal. The first information includes one or more of an identifier of the first terminal device, system time information, and an index of broadcast times. The method is applied in the process of generating the demodulation pilot reference signal by the terminal device.

Description

Demodulation pilot reference signal generation method and device

technical field

The present application relates to the field of communication technologies, in particular to V2X, intelligent driving, intelligent connected vehicles, etc., and in particular to a method and device for generating a demodulation pilot reference signal.

Background technique

之后，对基序列

进行循环移位α，得到解调导频参考信号。其中，u表示组号，v表示序列号。通常，为了保证解调导频参考信号具备良好的相关性，u∈{0,1,2，···，29}，v∈{0、1}，也就是说，根序列u和v的取值数量有限，进而使解调导频参考信号的表达空间有限。同时，由于对基序列

进行循环移位α，也会影响解调导频参考信号的相关性。而在车与任何事物通信(vehicle to everything，V2X)的车联网技术中，车辆需要与外界的任何事物进行通信，也就意味着，V2X系统需要大量互不相同(即互不相关)的DMRS，而基于ZC序列所生成的DMRS之间相关性可能较大，无法满足V2X系统的实际应用需求。A demodulation reference signal (demodulation reference signal, DMRS) can generally be used for related demodulation of a physical uplink shared channel (physical up share channel, PUSCH) and a physical uplink control channel (physical uplink control channel, PUCCH). Currently, DMRS can be generated by specifying sequences. Among them, as an implementation manner of generating DMRS, in the long term evolution (LTE) of universal mobile communication technology, for discrete Fourier transform orthogonal frequency division multiplexing (discrete fourier transform orthogonal frequency division multiplexing, DFT- OFDM) waveform design channel, first use root sequence u and v to generate ZC sequence (Zadoff-Chu sequence), and obtain the base sequence of DMRS based on ZC sequence

After that, for the base sequence

Perform a cyclic shift α to obtain a demodulated pilot reference signal. Among them, u represents the group number, and v represents the serial number. Usually, in order to ensure that the demodulation pilot reference signal has good correlation, u∈{0,1,2,...,29}, v∈{0,1}, that is, the root sequence u and v are The number of values is limited, so that the expression space of the demodulated pilot reference signal is limited. At the same time, due to the base sequence

The cyclic shift α also affects the correlation of the demodulated pilot reference signal. In the vehicle-to-everything (V2X) vehicle networking technology, the vehicle needs to communicate with anything in the outside world, which means that the V2X system requires a large number of different (ie unrelated) DMRSs. , and the correlation between the DMRSs generated based on the ZC sequence may be large, which cannot meet the practical application requirements of the V2X system.

As another implementation manner of generating the DMRS, for a channel designed with a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform, a pseudo noise (pseudo noise, PN) sequence is used to generate the DMRS. Moreover, the initial value of the PN sequence is related to the demodulation pilot scrambling code (scrambling identifier, SCID) and the cell identity configured by the high layer. That is to say, this method is mainly applied in the uplink and downlink communication links between the base station and the terminal device, that is, in the communication scenario configured with the cell identifier. In the V2X system, the terminal devices of both parties in communication may be within the coverage of the same cell, or may be within the coverage of different cells, or both are within the coverage of no mobile network. If the terminal device is not covered by the mobile network, it is likely that the cell identifier is not configured. As a result, the terminal device cannot obtain the DMRS based on the PN sequence, and thus cannot communicate normally.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a method and device for processing a demodulated pilot signal, which can ensure normal communication between terminal devices when there is no network coverage.

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 method for generating a demodulation pilot reference signal, and the method can be executed by a first terminal device. The first terminal device may be a terminal device, or may be a component (such as a chip system) in the terminal device. The method includes: the first terminal device determines the initial value of the 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 sends the first demodulation pilot signal to the second terminal device. A demodulated pilot reference signal. The first information includes one or more of an identifier of the first terminal device, system time information, and an index of broadcast times.

In the method for generating a demodulation pilot reference signal provided by the present application, the first terminal device determines the initial value of the PN sequence according to the channel type and the first information, and then generates the first demodulation pilot reference signal according to the initial value of the PN sequence, and The first demodulation pilot reference signal is sent to the second terminal device. The first information includes one or more of an identifier of the first terminal device, system time information, and an index of broadcast times. Compared with the prior art, the generation process of the demodulation pilot reference signal is suitable for the scenario of configuring the cell identity, and the initial value of the demodulation pilot reference signal is related to the demodulation pilot scrambling code and the cell identity configured by the high layer, For a terminal device in an area where a cell identity is not configured, the demodulation pilot reference signal cannot be generated, and direct communication between the two terminal devices cannot be guaranteed. In the method for generating a demodulation pilot reference signal provided by the embodiment of the present application, in different channel types, the initial value of the PN sequence is determined in combination with different first information, and then the first demodulation pilot reference signal sent to the second terminal device is generated. signal, and the first information includes one or more of an identification of the first terminal device, system time information, and an index of broadcast times. It can be seen that the used first information has nothing to do with the demodulation pilot scrambling code and the cell identity configured by the high layer, and even if neither the first terminal device nor the second terminal device is in the area where the cell identity is configured, the demodulation pilot can be generated normally. reference signal.

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

The first terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including:

The first terminal device determines the initial value of the pseudo-noise PN sequence according to the identifier of the first terminal device and the first system time information; or

The first 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 reference signal; wherein, the first system time information is obtained by using a slot index, a time domain symbol The time information represented by the configuration relationship between the index, the time slot and the number of time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals contained in each transmission time slot and the demodulation of the number The location of the pilot reference signal and the configuration information of the demodulation pilot reference signal are information configured by the network or information pre-stored 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, so that the corresponding data channel generated by each first terminal device can be The first demodulation pilot reference signals are different from each other. In this way, the degree of discrimination of the first demodulation pilot reference signals corresponding to the data channels of different terminal devices is improved, thereby reducing the interference between different terminal devices.

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

The first terminal device obtains the verification information of the control information from the control channel, and determines the identity of the first terminal device according to the verification information of the control information, or

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

The first terminal device pre-stores the identifier of the first terminal device.

In a 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 the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including:

The first terminal device determines the initial value of the PN sequence according to the first system time information and the second system time information, and the first system time information is determined by the configuration relationship between the time slot index, the time domain symbol index, and the number of time slots and time domain symbols. The represented time information, and the second system time information is the system time information when the first terminal device and the second terminal device are in a synchronized state represented by frame information and/or subframe information.

Here, the first terminal device determines the initial value of the PN sequence based on the system time information, and further generates a first demodulation pilot reference signal of the control channel, and sends it to the second terminal device. After the second terminal device receives the first demodulated pilot reference signals from different control channels of the first terminal device, the subframe numbers and/or frame numbers of the different first demodulated pilot reference signals can be obtained. If the subframe number and/or frame number of a 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 Synchronize with the second terminal device. In this way, the second terminal device can identify the first terminal device that is synchronized with itself from among the plurality of first terminal devices. In other words, the discrimination degree 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 a possible design, the channel type is a broadcast channel, and the first information includes an identifier of the first terminal device and an index of broadcast times.

The first terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including:

The first terminal device determines the initial value of the pseudo-noise PN sequence according to the identifier of the first terminal device and the broadcast times index, where the broadcast times index represents an index of the times of broadcast messages on the broadcast channel within a predetermined 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 of the first terminal device and the broadcast times index, thereby providing information support for the local end to generate the second demodulation pilot reference signal.

In a second aspect, the present application provides a method for generating a demodulation pilot reference signal, and the method can be executed by a second terminal device. The second terminal device may be a terminal device, or may be a component (such as a chip system) in the terminal device. The method includes: 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, both the first demodulation pilot reference signal and the second demodulation pilot reference signal are used for channel estimation. The first information includes one or more of an identifier of a first terminal device, system time information, and an index of broadcast times, and the first terminal device is a terminal device that sends a first demodulated pilot reference signal to a second terminal device.

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

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

The second terminal device determines the initial value of the PN sequence according to the identity 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 reference signal; wherein, the first system time information is obtained by using the time slot index, time domain symbol The time information represented by the configuration relationship between the index, the time slot and the number of time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals contained in each transmission time slot and the demodulation of the number The location of the pilot reference signal and the configuration information of the demodulation pilot reference signal are information configured by the network or information pre-stored by the second terminal device.

In a possible design, the second terminal device may also perform the following steps:

The second terminal device obtains the verification information of the control information from the control channel, and determines the identity of the first terminal device according to the verification information of the control information, or

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

The second terminal device pre-stores the identity of the first terminal device.

In a 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 second terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including:

The second terminal device determines the initial value of the pseudo-noise PN sequence according to the first system time information and the second system time information, where the first system time information is configured by the time slot index, time domain symbol index, and the number of time slots and time domain symbols The time information represented by the relationship, and the second system time information is the system time information when the first terminal device and the second terminal device are in a synchronized state represented by frame information and/or subframe information.

In a possible design, the channel type is a broadcast channel, and the first information includes an identifier of the first terminal device and an index of broadcast times.

The second terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information, which can be specifically implemented as the following steps: The number of times index represents an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

In a third aspect, the present application provides an apparatus for generating a demodulation pilot reference signal, and the apparatus may be the first terminal apparatus in the above-mentioned first aspect. The apparatus includes a processor, a transmitter, a receiver and a memory. The processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, where the first information includes one or more of the identification of the first terminal device, the system time information and the broadcast times index; The initial value is used to generate the first demodulation pilot reference signal; the transmitter is used for sending the first demodulation pilot reference signal to the second terminal device.

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

a processor, configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the pseudo-noise PN sequence according to the identification of the first terminal device and the first system time information; or

Used to determine 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 reference signal; wherein, the first system time information is obtained through the time slot index, time domain symbol index, The time information represented by the configuration relationship between the number of time slots and time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals contained in each transmission time slot and the number of demodulation pilots The location of the reference signal and the configuration information of the demodulation pilot reference signal are the information configured by the network or the information pre-stored in the memory.

In a possible design, the processor is configured to control the receiver to obtain check information of the control information from the control channel; determine the identity of the first terminal device according to the check information of the control information, or

for controlling the receiver to obtain the identification of the first terminal device from the control information, or

The identifier of the first terminal device is pre-stored in the control memory.

In a 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 processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the PN sequence according to the first system time information and the second system time information, and the first system time information is The time information represented by the time slot index, the time domain symbol index, and the configuration relationship between the number of time slots and time domain symbols, the second system time information is the first terminal device and the second system represented by the frame information and/or the subframe information. System time information when the terminal device is in a synchronized state.

In a possible design, the channel type is a broadcast channel, and the first information includes an identifier of the first terminal device and an index of broadcast times.

The processor is used to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, which can be specifically implemented as: for determining the initial value of the pseudo-noise PN sequence according to the identifier of the first terminal device and the broadcast times index, the broadcast times The index represents 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 an apparatus for generating a demodulation pilot reference signal, which may be the second terminal apparatus in the foregoing second aspect. The apparatus includes a processor, a receiver and a memory. Specifically, the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and first information, where the first information includes one or more of the identifier of the first terminal device, system time information, and an index of broadcast times, the first A terminal device is a terminal device that sends a first demodulation pilot reference signal to a second terminal device; according to the initial value of the PN sequence, a second demodulation pilot reference signal is generated, the first demodulation pilot reference signal and the second demodulation pilot reference signal are generated according to the initial value of the PN sequence. The demodulated pilot reference signals are all used for channel estimation.

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

a processor, configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the PN sequence according to the identifier of the first terminal device and the first system time information; or

Used to determine 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 reference signal; wherein, the first system time information is obtained through the time slot index, time domain symbol index, The time information represented by the configuration relationship between the number of time slots and time domain symbols, the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals contained in each transmission time slot and the number of demodulation pilots The location of the reference signal and the configuration information of the demodulation pilot reference signal are the information configured by the network or the information pre-stored in the memory.

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

The processor is further configured to determine the identity of the first terminal device according to the check information of the control information, or

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

The memory is used for pre-storing the identifier of the first terminal device.

In a 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.

a processor, configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the pseudo-noise PN sequence according to the first system time information and the second system time information, the first system time The information is the time information represented by the time slot index, the time domain symbol index, and the number configuration relationship between the time slot and the time domain symbol, and the second system time information is represented by the frame information and/or the subframe information. System time information when the second terminal device is in a synchronized state.

In a possible design, the channel type is a broadcast channel, and the first information includes an identifier of the first terminal device and an index of broadcast times.

The processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the PN sequence according to the identification of the first terminal device and the broadcast times index, where the broadcast times index represents a predetermined time period Index of the number of times the message was broadcast by the inner broadcast channel.

In a fifth aspect, the present application provides an apparatus for generating a demodulation pilot reference signal, which is used to implement the function of the first terminal apparatus in the above-mentioned first aspect, or the function of the second terminal apparatus in the above-mentioned second aspect.

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

In a seventh aspect, a demodulation pilot reference signal generating apparatus is provided, comprising: a processor and a memory; the memory is used for storing computer execution instructions, and when the demodulation pilot reference signal generating apparatus runs, the processor executes the The computer stored in the memory executes instructions to cause the demodulation pilot reference signal generation apparatus to perform the demodulation pilot reference signal generation method of any one of the above aspects.

In an eighth aspect, a device for generating a demodulation pilot reference signal is provided, comprising: a processor; the processor is configured to be coupled to a memory, and after reading an instruction in the memory, execute the method according to any one of the above-mentioned aspects according to the instruction A demodulation pilot reference signal generation method.

In a ninth aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, which, when executed on a computer, enable the computer to execute the demodulation pilot reference of any one of the above-mentioned aspects. Signal generation method.

A tenth aspect provides a computer program product comprising instructions which, when run on a computer, enable the computer to execute the demodulation pilot reference signal generation method of any one of the above aspects.

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

A twelfth aspect provides a chip, the chip includes a processor, the processor is coupled to a memory, the memory stores program instructions, and when the program instructions stored in the memory are executed by the processor, the demodulation and guidance of any one of the above-mentioned aspects is implemented. Frequency reference signal generation method.

A thirteenth aspect provides a communication system including the first terminal device in any one of the above aspects and the second terminal device in any one of the above aspects.

Wherein, for the technical effect brought by any one of the design methods in the second aspect to the thirteenth aspect, reference may be made to the technical effects brought by the different design methods in the first aspect, which will not be repeated here.

Description of drawings

FIG. 1 is a schematic diagram of an application scenario of a V2X system provided by an embodiment of the present application;

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

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

4 is a flowchart of a method for generating a demodulation pilot reference signal provided by an embodiment of the present application;

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;

6 is a flowchart of a method for generating a demodulation pilot reference signal of a data channel provided by an embodiment of the present application;

7 is a flowchart of a method for generating a demodulation pilot reference signal of a control channel provided by an embodiment of the present application;

8 is a flowchart of a method for generating a demodulation pilot reference signal of a broadcast channel provided by an embodiment of the present application;

9 is a flowchart of a method for transmitting data channel information provided by an embodiment of the present application;

10 is a flowchart of a method for transmitting data channel information provided by an embodiment of the present application;

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

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

Detailed ways

The terms "first" and "second" in the description and drawings of the present application are used to distinguish different objects, or to distinguish different processing of the same object, rather than to describe a specific order of the objects. Furthermore, references to the terms "comprising" and "having" in the description of this application, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes other unlisted steps or units, or optionally also Include other steps or units inherent to these processes, methods, products or devices. It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

The embodiments of the present application may be applied to a system for communication between terminal devices, such as a V2X communication system and a device to device (device to device, D2D) system. In the following, a communication system to which the embodiments of the present application are applied will be described by taking the V2X communication system as an example. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the communication system includes at least two terminal devices, and the two terminal devices can communicate directly through a sidelink (SL) (in FIG. 1 , FIG. 2 and FIG. 3 ) only two terminal devices are shown). Optionally, the communication system further includes an access network device. The terminal device may also communicate with the access network equipment.

The following communication scenarios can exist in the V2X communication system: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-network (vehicle-to-network) communication , V2N) communication, vehicle topedestrain (V2P) communication between vehicles and pedestrians, etc. In a V2X communication system, terminal devices communicate directly through sidelinks (SLs), without the need for a transceiving process of access network equipment, and there is no uplink or downlink communication link.

Among them, the terminal device is mainly used to receive or transmit data. Optionally, the terminal device involved in the embodiment of the present application may be a device or a component in the device that implements the terminal function. For example, the terminal device includes, for example, but not limited to, various handheld devices, vehicle-mounted devices, Wearable device, computing device, or other processing device connected to a wireless modem; may also include subscriber units, cellular phones, smart phones, wireless data cards, personal digital assistants, PDA) computer, tablet computer, handheld device (handheld), laptop computer (laptop computer), machine type communication (MTC) terminal (terminal), user equipment (UE), mobile terminal, etc. For another example, the terminal device may be a component in any of the above-mentioned devices (for example, the terminal device may refer to a chip system in any of the above-mentioned devices). In some embodiments of the present application, the terminal device may also be referred to as a terminal, which is uniformly described here, and will not be repeated below.

The access network device involved in the embodiments of the present application is a device deployed in a wireless access network to provide a wireless communication function. Optionally, the access network device may refer to the device on the air interface of the access network that communicates with the wireless terminal through one or more cells, wherein the device that implements the functions of the access network device may be the access network device, or It is a device (such as a chip in the access network device) that supports the access network device to realize this function. Optionally, the access network device may perform attribute management on the air interface. The base station equipment may also coordinate attribute management of the air interface. Access network equipment includes various forms of macro base stations, micro base stations (also called small cells), relay devices such as relay stations or chips of relay devices, transmission reception points (TRP), evolved network nodes (evolved Node B, eNB), next generation network node (g Node B, gNB), evolved node B (ng evolved Node B, ng-eNB) connected to the next generation core network, and the like. Alternatively, in a distributed base station scenario, the access network equipment may be a base band unit (BBU) and a remote radio unit (RRU). In a cloud radio access network (CRAN) In the scenario, the access network device may be a baseband pool (BBU pool) and an RRU.

Referring to Figure 1, Figure 2 and Figure 3, for two terminal devices (UE1 and UE2) using sidelink communication, there may be the following three communication scenarios: First, two terminal devices (UE1 and UE2) are all within the coverage of the same public land mobile network (PLMN) (such as PLMN1), as shown in Figure 1; second, only one terminal device (UE1) is in the public land mobile network (public land mobile network, PLMN) (such as PLMN1) coverage, another terminal device (UE2) is outside the coverage of the public land mobile network (public land mobile network, PLMN) (PLMN1), as shown in Figure 2; Third, the two terminals The devices (UE1 and UE2) are both outside the coverage of a public land mobile network (PLMN) (eg PLMN1), and the areas where the two terminal devices are located have no preconfigured cell identifiers, as shown in FIG. 3 . Among them, the dotted elliptical areas in Figure 1, Figure 2 and Figure 3 all represent the coverage area of the PLMN1. Since the sidelink is used for communication between the two terminal devices, the communication can be performed normally regardless of whether the two terminal devices are in the coverage area of the PLMN at the same time.

When communicating between two terminal devices based on a sidelink (SL), both the terminal devices need to generate a demodulation reference signal (demodulation reference signal, DMRS). There are two DMRS generation methods in the related art.

生成过程满足如下：The first method of generating DMRS: in the design of discrete fourier transform orthogonal frequency division multiplexing (DFT-OFDM) waveforms with low peak to average ratio (PAPR), based on The ZC sequence generates a demodulation pilot reference signal. Among them, the base sequence of the demodulation pilot reference signal

The generation process satisfies the following:

表示向下取整运算符。Among them, u∈{0,1,2,...,29} is the group number, v∈{0,1} is the sequence number in the group, M _SC is the sequence length of the demodulation pilot reference signal, N _ZC represents the largest prime number smaller than M _SC .

Represents the round-down operator.

进行循环移位α，得到解调导频参考信号，基于基序列

得到解调导频参考信号过程满足如下公式：base sequence

Perform a cyclic shift α to obtain a demodulated pilot reference signal, based on the base sequence

The process of obtaining the demodulated pilot reference signal satisfies the following formula:

Among them, δ represents the subcarrier spacing configuration, and α represents the cyclic shift.

To sum up, when the demodulation pilot reference signal is obtained based on the ZC sequence, three parameters are required: u, v, α. Among them, the value ranges of u and v are limited to ensure good correlation between the demodulation pilot reference signals. In this way, the expression space of the demodulated pilot reference signal generated based on the finite values of u and v is limited. When a large number of terminal devices communicate with each other, the demodulation pilot reference signal needs to have a larger expression space. Therefore, the method for obtaining the demodulated pilot reference signal based on the ZC sequence cannot be applied to the scenario of communication between a large number of terminal devices.

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

Among them, 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)=(x ₁ (n+N _c )+x ₂ (n+N _c ))mod2 (7)

x ₁ (n+31)=(x ₁ (n+3)+x ₁ (n))mod2 (8)

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

Wherein, N _c =1600, and x ₁ (n) and x ₂ (n) represent two m sequences (a kind of PN sequence). Each m-sequence requires 31 initial values.

The initial value of x ₁ (n) is a fixed value. x ₁ (0)=1, x ₁ (n)=0, n=1, 2, . . . , 30.

The initial value of x ₂ (n) satisfies the following formula:

Among them, c _init represents the initial value of x ₂ (n). In different channel types, the initial value of x ₂ (n) (ie, c _init ) satisfies different calculation formulas.

Specifically, in a new radio (NR) uplink data channel, the initial value of x ₂ (n) (that is, c _init ) satisfies the following formula:

表示每个时隙中的符号个数，

表示一个无线帧的时隙索引，l表示在一个时隙中解调导频参考信号所在符号的索引，

表示高层配置的上行解调导频扰码标识(scrambling identity，SCID)，n_SCID∈{0、1}。在高层配置x₂(n)的初始值，或下行控制信息(downlink control information，DCI)调度物理上行共享信道(physical up share channel，PUSCH)传输时，n_SCID＝1。其他情况，n_SCID＝0。in,

represents the number of symbols in each slot,

represents the slot index of a radio frame, l represents the index of the symbol where the demodulated pilot reference signal is located in a slot,

Indicates the uplink demodulation pilot scrambling identity (scrambling identity, SCID) configured by the upper layer, n _SCID ∈ {0, 1}. When the upper layer configures the initial value of x ₂ (n), or when downlink control information (DCI) schedules physical uplink shared channel (physical up share channel, PUSCH) transmission, n _SCID =1. Otherwise, n _SCID =0.

已知，在不同时隙、不同符号上使用的m序列初始值不同，进而生成具有区分度的解调导频参考信号。In this way, for a certain terminal device, if

It is known that the initial values of m-sequences used in different time slots and symbols are different, so as to generate a demodulation pilot reference signal with a degree of discrimination.

Specifically, in a new radio (new radio, NR) downlink control channel, the initial value of x ₂ (n) (that is, c _init ) satisfies the following formula:

表示一个无线帧的时隙索引，l表示在一个时隙中解调导频参考信号所在符号的索引，N_ID∈{0,1，…，65535}表示高层配置的控制信道解调导频扰码标识。若未配置N_ID，也可由小区ID替代，此时，

in,

represents the slot index of a radio frame, l represents the index of the symbol where the demodulation pilot reference signal is located in a slot, N _ID ∈ {0,1,...,65535} represents the control channel demodulation pilot scrambling configured by the upper layer code identification. If N _ID is not configured, it can also be replaced by cell ID. In this case,

Specifically, in a new radio (NR) broadcast channel, the initial value of x ₂ (n) (ie, c _init ) satisfies the following formula:

表示高层配置的当前发送广播信号的小区表示。L表示预设时间周期内广播信号的最大次数。in,

Indicates the cell representation of the currently transmitting broadcast signal as configured by the higher layers. L represents the maximum number of broadcast signals within a preset time period.

其中，n_hf表示半帧指示。n_hf＝0，表示广播信号在当前无线帧的前半帧发送；n_hf＝1，表示广播信号在当前无线帧的后半帧发送。i_SSB表示周期内广播信号次数索引的最低两个比特位。When L=4,

Among them, n _hf represents the field indication. n _hf =0, indicating that the broadcast signal is sent in the first half of the current radio frame; n _hf =1, indicating that the broadcast signal is sent in the second half of the current radio frame. i _SSB represents the lowest two bits of the index of the number of times the signal is broadcast in the period.

其中，i_SSB表示周期内广播信号次数索引的最低三个比特位。When L=8 or L=64,

Wherein, i _SSB represents the lowest three bits of the index of the times of broadcast signals in a period.

In summary, in the process of obtaining the demodulation pilot reference signal based on the PN sequence, the initial value of the PN sequence needs to be obtained, and the initial value of the PN sequence is related to the demodulation pilot scrambling identifier (SCID) and the cell identity configured by the high layer. , that is to say, the method of using the PN sequence to generate the demodulation pilot reference signal is mainly applied to the uplink and downlink communication scenarios between the base station and the terminal device. For two terminal devices in direct communication, there may be one terminal device in the coverage of a public land mobile network (PLMN), and the other terminal device in a public land mobile network (PLMN) Outside the coverage, that is, the scenario shown in FIG. 2 , there may also be a situation where the terminal devices are all outside the coverage of a public land mobile network (Public Land Mobile Network, PLMN), that is, the scenario shown in FIG. 3 . In the above two scenarios shown in FIG. 2 and FIG. 3 , in the process of generating the DMRS, the terminal device cannot determine the PN because it cannot obtain the demodulation pilot scrambling identifier (scrambling identifier, SCID) and the cell identifier configured by the upper layer. The initial value of the sequence, that is to say, the initial value of the m sequence (a kind of PN sequence) of x ₂ (n) cannot be obtained, and thus the DMRS cannot be generated, which affects the normal communication between terminal devices.

An embodiment of the present application provides a method for generating a demodulation pilot reference signal, and the method is applied in a process of generating a demodulation pilot reference signal by a terminal device. Wherein, sidelinks may be used for communication between terminal devices.

In the following, a method for generating a DMRS by the first terminal device and the second terminal device respectively will be described by taking the first terminal device sending information to the second terminal device as an example. The first terminal device is used as the transmitting end. Referring to FIG. 4 , the DMRS generation method according to the embodiment of the present application includes the following steps:

S401. The first terminal device determines the initial value of the PN sequence according to the channel type and the first information.

The channel types may include data channels, control channels and broadcast channels.

The first information includes one or more of an identification of the first terminal device, system time information, and an index of broadcast times. The first terminal device may obtain the identification of the first terminal device from the control information of the control channel, or obtain the identification of the first terminal device from the verification information of the control information, and may also pre-store the identification of the first terminal device. The system time information includes the first system time information and the second system time information. The first system time information is the time information represented by the time slot index, the time domain symbol index, and the number configuration relationship between the time slot and the time domain symbol. The system time information represents system time information when the first terminal device and the second terminal device are in a synchronized state. Exemplarily, parameters that can characterize the system time information include but are not limited to frame numbers and subframe numbers. The broadcast number index represents 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 refers to different first information to determine the initial value of the PN sequence. The channel types include but are not limited to data channels, control channels, and broadcast channels.

Specifically, when the channel type is a data channel, the system time information includes the first system time information, and the first system time information is the time represented by the time slot index, the time domain symbol index, and the configuration relationship between the number of time slots and time domain symbols information. The first information includes the identification of the first terminal device and the 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 the specific implementation process may include the following steps:

S40110. The first terminal device acquires check information of the control information from the control channel.

Wherein, the verification information includes information used to generate the first terminal device identification.

Exemplarily, the check information may be a cyclic redundancy check (CRC). Some bits in the CRC check information, such as the first 24 bits, carry the identifier of the first terminal device. After the first terminal device demodulates and decodes the information transmitted by the control channel, the CRC check information can be obtained.

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

Exemplarily, taking the identification of the first terminal device determined based on the cyclic redundancy check code and the first 24 bits in the CRC check code carrying the identification of the first terminal device as an example, the identification of the first terminal device satisfies the following formula: :

Wherein, N _ID represents the identity of the first terminal device, _k represents the index of the bit used to carry the identity of the first terminal device in the cyclic redundancy check code, and ck represents the first terminal carried by the bit with index k part of the device identification.

In this way, the first terminal device acquires the identifier of the first terminal device based on the check information of the control information transmitted by the control channel, so as to determine the initial value of the PN sequence.

In a scenario where the channel type is a data channel, the number of first demodulation pilot reference signals corresponding to the data channel remains unchanged. 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 the 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 time information represented by a slot index, a time-domain symbol index, and a configuration relationship between the number of slots and time-domain symbols.

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

表示每个时隙中的时域符号个数，

表示第一解调导频参考信号在一个无线帧的时隙索引，l表示在一个时隙中第一解调导频参考信号所在时域符号的索引，N_ID表示第一终端装置的标识。第一DMRS为第一终端装置生成的DMRS，类似的，下文中，第二DMRS为第二终端装置生成的DMRS。in,

represents the number of time domain symbols in each slot,

represents the time slot index of the first demodulated pilot reference signal in a radio frame, l represents the index of the time domain symbol where the first demodulated pilot reference signal is located in a time slot, and N _ID represents the identifier of the first terminal device. The first DMRS is the DMRS generated by the first terminal device, and similarly, hereinafter, the second DMRS is the DMRS generated by the second terminal device.

It should be noted that one demodulation pilot reference signal may occupy one or more time-domain symbols. In the embodiments of the present application, one demodulation pilot reference signal occupies one time-domain symbol as an example for description.

When one demodulation pilot reference signal can occupy multiple time-domain symbols, 1 in formula (14) takes the index of the first time-domain symbol among the multiple time-domain symbols.

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, so that the corresponding data channel generated by each first terminal device can be The first demodulation pilot reference signals are different from each other. In this way, the degree of discrimination of the first demodulation pilot reference signals corresponding to the data channels of different terminal devices is improved, thereby reducing the interference between different terminal devices.

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 Figure 6, the specific implementation process of S401 may include:

S40113. The first terminal device determines the 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 can be referred to above, and details are not repeated here. The configuration information of the demodulation pilot reference signals includes: the number of demodulation pilot reference signals included in each transmission time slot, and the positions of the demodulation pilot reference signals of the quantity. The configuration information may be pre-stored in the first terminal device, or sent to the first terminal device after being configured by the access network device. Exemplarily, the configuration information of the demodulated pilot reference signal includes one or more pilot configuration indices. Each pilot configuration index corresponds to the number of demodulation pilot reference signals included in each transmission time slot and the position of each demodulation pilot reference signal in a transmission time slot. Table 1 shows a possible implementation of configuration information.

Table 1

Wherein, n _DMRS-index represents the pilot frequency configuration index, and l ₀ represents the index of the first time-domain symbol in one transmission time slot. Referring to Table 1, taking one demodulation pilot reference signal occupying one time domain symbol as an example, when the pilot configuration index n _DMRS-index is 0, the first demodulation pilot reference signal included in each transmission time slot is (that is, the number of demodulation pilot reference signals generated by the first terminal) is 1, and the time domain symbol index of the first demodulation pilot reference signal in one transmission time slot is 1 ₀ (ie 1 ₀ +0). When the pilot configuration index n _DMRS-index is 1, a time slot contains two first demodulation pilot reference signals, and the time domain symbols of the two first demodulation pilot reference signals included in the time slot The indices are represented as: l ₀ +0 and l ₀ +7, respectively. When the pilot configuration index n _DMRS-index is 3, the number of first demodulation pilot reference signals included in each transmission time slot is 4, and 4 first demodulation pilot reference signals are in one transmission time slot. The time-domain symbol indices of are denoted as l ₀ , l ₀ +5, l ₀ +8, and l ₀ +11, respectively. At this time, the first terminal device may select a certain pilot configuration index from the configuration information according to the actual application requirements, and accordingly determine the number and amount of the first demodulation pilot reference signals included in each transmission time slot. The positions of the first demodulated pilot reference signals of this number, and then the initial value of the PN sequence can be obtained.

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

表示每个时隙中的时域符号个数，

表示第一解调导频参考信号在一个无线帧中的时隙索引，l表示在一个时隙中第一解调导频参考信号所在时域符号的索引，N_ID表示在数据信道中第一终端装置的标识，N_DMRS表示一个传输时隙中所包含的第一解调导频参考信号的数量，N_index∈{0,1,2，…，N_DMRS-1}，表示一个传输时隙中第一解调导频参考信号的索引。在一个帧结构中，第一解调导频参考信号的索引从左到右依次递增。in,

represents the number of time domain symbols in each slot,

Represents the time slot index of the first demodulation pilot reference signal in a radio frame, l represents the index of the time domain symbol where the first demodulation pilot reference signal is located in a time slot, and N _ID represents the first demodulation pilot reference signal in the data channel. The identification of the terminal device, N _DMRS represents the number of first demodulation pilot reference signals contained in one transmission slot, N _index ∈ {0, 1, 2, ..., N _DMRS -1}, represents one transmission slot The index of the first demodulated pilot reference signal in . In a frame structure, the index of the first demodulation pilot reference signal increases sequentially from left to right.

In this way, the first terminal device determines the 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, different initial values correspond to different numbers of first pilots. The number of first pilots, that is, the first demodulation pilot reference signals that can be transmitted in one time slot, for example, see Table 1, When the PN sequence has a certain initial value, the corresponding n _DMRS-index is 1, and correspondingly, one time slot can transmit two first demodulation pilot reference signals. And different initial values correspond to generate different first demodulation pilot reference signals. From this, it can be deduced that different first demodulated pilot reference signals correspond to different first pilot numbers. Therefore, after receiving a certain first demodulated pilot reference signal, the second terminal device can know the first demodulated pilot reference signal. The number of the first pilots corresponding to the demodulation pilot reference signals, that is, the number of the first demodulation pilot reference signals that can be transmitted in one time slot is obtained. This is equivalent to that the first demodulated pilot reference signal can implicitly indicate the number of first pilots, and further, it is not necessary to display the number of first pilots carried by the control information, which reduces the length of the control information and saves 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 time slot index, the time domain symbol index, the number configuration relationship between the time slot and the time domain symbol can all represent the time information of the first system, and the frame information and the subframe information can both represent the relationship between the first terminal device and the first terminal device. The second system time when the two terminal devices are in a synchronized state. Referring to Figure 7, the specific implementation process of S401 may include:

S4013. The first terminal device determines the initial value of the PN sequence according to the first system time information and the second system time information.

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

Exemplarily, the frame information may use a frame number, and the subframe information may use 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 adopted:

Manner 1: The first terminal device determines the initial value of the PN sequence according to the first system time information and frame information (eg, frame number).

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

表示每个时隙中的时域符号个数，

表示第一解调导频参考信号在一个无线帧中的时隙索引，l表示在一个时隙中第一解调导频参考信号所在时域符号的索引，N_f表示第一终端装置与第二终端装置处于同步状态时的帧号。in,

represents the number of time domain symbols in each slot,

represents the time slot index of the first demodulation pilot reference signal in a radio frame, l represents the index of the time domain symbol where the first demodulation pilot reference signal is located in a time slot, and N _f represents the relationship between the first terminal device and the first terminal device. The frame number when the two terminal devices are in a synchronized state.

Manner 2: The first terminal device determines the initial value of the pseudo-noise PN sequence according to the first system time information and the subframe information (eg, the subframe number).

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

表示每个时隙中的时域符号个数，

表示第一解调导频参考信号在一个无线帧的时隙索引，l表示在一个时隙中第一解调导频参考信号所在时域符号的索引，n_f表示第一终端装置与第二终端装置处于同步状态时的子帧号。in,

represents the number of time domain symbols in each slot,

represents the time slot index of the first demodulation pilot reference signal in a radio frame, l represents the index of the time domain symbol where the first demodulation pilot reference signal is located in a time slot, n _f represents the first terminal device and the second Subframe number when the terminal device is in the synchronized state.

Manner 3: The first terminal device determines the initial value of the pseudo-noise PN sequence according to the first system time information, frame information (eg, frame number) and subframe information (eg, subframe number).

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

表示每个时隙中的时域符号个数，

表示一个无线帧的时隙索引，l表示在一个时隙中第一解调导频参考信号所在时域符号的索引，N_f表示第一终端装置与第二终端装置处于同步状态时的帧号，n_f表示第一终端装置与第二终端装置处于同步状态时的子帧号。in,

represents the number of time domain symbols in each slot,

Represents the time slot index of a radio frame, l represents the index of the time domain symbol where the first demodulation pilot reference signal is located in a time slot, N _f represents the frame number when the first terminal device and the second terminal device are in a synchronized state , n _f represents the subframe number when the first terminal device and the second terminal device are in a synchronized state.

Here, the first terminal device determines the initial value of the PN sequence based on the system time information, and further generates a first demodulation pilot reference signal of the control channel, and sends it to the second terminal device. After the second terminal device receives the first demodulated pilot reference signals from different control channels of the first terminal device, the subframe numbers and/or frame numbers of the different first demodulated pilot reference signals can be obtained. If the subframe number and/or frame number of a 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 Synchronize with the second terminal. In this way, the second terminal device can identify the first terminal device that is synchronized with itself from among the plurality of first terminal devices. In other words, the discrimination degree 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 device and an index of broadcast times. Referring to FIG. 8, the specific implementation process of S401 may include:

S4014. The first terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device and the broadcast times index.

Wherein, the identification of the first terminal device includes the identification of the first terminal device in the synchronization channel.

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

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

表示在同步信道中第一终端装置的标识，i_SSB表示预定时间周期内广播信道广播消息次数的索引。

为向下取整运算符，mod为取模运算符。时间周期可以是预先配置的参数，如接入网设备所配置的参数。in,

represents the identity of the first terminal device in the synchronization channel, and i _SSB represents the index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

is the round-down operator, and mod is the modulo operator. The time period may be a preconfigured parameter, such as a parameter configured by an access network device.

In this way, 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 also different, and further, the first demodulation pilot reference signal generated from the initial value of the PN sequence is also different. In this way, the expression space of the first demodulation pilot reference signal of the broadcast channel is enlarged, the recognizability 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 manner, when generating the first demodulation pilot reference signal based on the PN sequence, two m sequences (the m sequence is a type of PN sequence) are required, namely x ₁ (n) and x ₂ (n). Each m-sequence requires 31 initial values. Wherein, the initial value of x ₁ (n) is a fixed value, that is, x ₁ (0)=1, x ₁ (n)=0, n=1, 2, . . . , 30. The initial value of x ₂ (n) can be determined by S401, and according to formula (10), x ₂ (n) can be obtained. After the two m-sequences x ₁ (n) and x ₂ (n) are determined, according to formula (6) to formula (9), first demodulation pilot reference signals of different channel types can be obtained.

S403. The first terminal device sends the first demodulation pilot reference signal to the second terminal device.

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

In the method for generating a demodulation pilot reference signal provided by the embodiment of the present application, the first terminal device determines the initial value of the PN sequence according to the channel type and the first information, and then generates the first demodulation pilot reference signal according to the initial value of the PN sequence , and send the first demodulation pilot reference signal to the second terminal device. The first information includes one or more of an identifier of the first terminal device, system time information, and an index of broadcast times. Compared with the prior art, the generation process of the demodulation pilot reference signal is suitable for the scenario of configuring the cell identity, and the initial value of the demodulation pilot reference signal is related to the demodulation pilot scrambling code and the cell identity configured by the high layer, For a terminal in an area where a cell identity is not configured, a demodulation pilot reference signal cannot be generated, and direct communication between the two terminal devices cannot be guaranteed. In the method for generating a demodulation pilot reference signal provided by the embodiment of the present application, in different channel types, the initial value of the PN sequence is determined in combination with different first information, and then the first demodulation pilot reference signal sent to the second terminal device is generated. signal, and the first information includes one or more of an identification of the first terminal device, system time information, and an index of broadcast times. It can be seen that the used first information has nothing to do with the demodulation pilot scrambling code and the cell identity configured by the high layer, and even if neither the first terminal device nor the second terminal device is in the area where the cell identity is configured, the demodulation pilot can be generated normally. reference signal.

It should be noted that, in the process of sending information from the first terminal device to the second terminal device, the second terminal device, as the receiving end, needs to perform channel estimation to obtain channel information, so as to assist in decoding and accurately obtain the information sent by the first terminal device. Information. When performing channel estimation, the second terminal device needs two kinds of demodulation pilot reference signals, that is, the first demodulation pilot reference signal received by the second terminal device and the second demodulation pilot reference signal generated by the second terminal device Signal. Referring to FIG. 4, the execution steps of the second terminal device are as follows:

S404. The second terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information.

The channel types may include data channels, control channels and broadcast channels.

The first information includes one or more of an identification of the first terminal device, system time information, and an index of broadcast times. The first terminal device is a terminal device that transmits the first demodulated pilot reference signal to the second terminal device. The second terminal device may acquire the identifier of the first terminal device during the process of communicating with the first terminal device, or acquire the first terminal from sidelink control information (SCI) transmitted through the control channel The identification of the device, or the identification of the first terminal device is obtained from a cyclic redundancy check (cyclic redundancy check, CRC) transmitted through the control channel. The system time information includes the first system time information and the second system time information. The first system time information is the time information represented by the time slot index, the time domain symbol index, and the number configuration relationship between the time slot and the time domain symbol. The system time information represents system time information when the first terminal device and the second terminal device are in a synchronized state. Exemplarily, parameters that can characterize the system time information include but are not limited to frame numbers and subframe numbers. The broadcast number index represents an index of the number of times the broadcast channel broadcasts the message within a predetermined time period.

It should be noted that, when performing channel estimation on the data channel, the first demodulation pilot reference signal of the data channel and the second demodulation pilot reference signal of the data channel need to be used. Similarly, when performing channel estimation on the control channel or broadcast channel, the demodulation pilot reference signal corresponding to the 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 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 verification information of the control information includes information capable of generating the identification of the first terminal device.

Exemplarily, the check information may be a cyclic redundancy check (CRC). Some bits in the CRC check information, such as the first 24 bits, carry the identifier of the first terminal device. After the second terminal device demodulates and decodes the information transmitted by the control channel, the CRC check information can be obtained.

S40411. The second terminal device determines the identifier of the first terminal device according to the verification information of the control information.

Exemplarily, taking the identification of the first terminal device determined based on the cyclic redundancy check code and the first 24 bits in the CRC check code carrying the identification of the first terminal device as an example, the identification of the first terminal device satisfies the following formula: :

Wherein, N _ID represents the identity of the first terminal device, _k represents the index of the bit used to carry the identity of the first terminal device in the cyclic redundancy check code, and ck represents the first terminal carried by the bit with index k part of the device identification.

In this way, the second terminal device acquires the identity of the first terminal device based on the information transmitted by the control channel, so as to determine the initial value of the PN sequence.

In a scenario where the channel type is a data channel and the number of first demodulation pilot reference signals corresponding to the data channel is unchanged. 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 the 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 time information represented by a slot index, a time-domain symbol index, and a configuration relationship between the number of slots and time-domain symbols. The specific form of identification of the first terminal device adopted by the second terminal device (receiving terminal) needs to be consistent with the specific form of identification of the first terminal device adopted by the first terminal device (ie, the transmitting terminal) in S4011. Moreover, the initial value of the PN sequence also needs to satisfy formula (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 end 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 the data channel, and the number of the first demodulation pilot reference signal corresponding to the data channel is variable. At this time, in one transmission time slot, the second terminal device will receive 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 in combination with the configuration information, and the required first information includes the identity of the first terminal device, the first system time information, and the configuration of the demodulation pilot reference signal. For information, see FIG. 6, the specific implementation process of S404 may include:

S40413: The second terminal device determines the 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 time information represented by a slot index, a time-domain symbol index, and a configuration relationship between the number of slots and time-domain symbols. The configuration information of the demodulation pilot reference signals includes: the number of the first demodulation pilot reference signals included in each transmission time slot, and the positions of the first demodulation pilot reference signals of the quantity. The configuration information of the demodulation pilot reference signal may be configured by the network, or information pre-stored by the second terminal device.

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

Since the second terminal device fails to obtain the pilot configuration index used by the first terminal device when executing S4012, the second terminal device first generates the second demodulation pilot reference signals corresponding to all the pilot configuration indices to form A second set of demodulated pilot reference signals. For each second demodulated pilot reference signal, the initial value of its PN sequence also needs to satisfy formula (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 time information of the first system and the configuration information of the demodulation pilot reference signal, and then determines the initial values of all possible second demodulation pilot reference signals for the local terminal Information support is provided by generating all possible second demodulation pilot reference signals.

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

S4043. The second terminal device determines the initial value of the PN sequence according to the first system time information and the second system time information.

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

When determining the initial value of the PN sequence of the control channel, the method adopted in S4043 needs to be consistent with the method adopted in S4013. For example, in S4013, the initial value of the PN sequence is determined based on the frame number (ie, mode 1), then in S4043, the frame number also needs to be used to determine the initial value of the PN sequence. Moreover, the initial value of the PN sequence also needs to satisfy formula (16).

In this way, the second terminal device determines the 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 end to generate the second demodulation pilot reference signal.

In a possible scenario, if the first demodulation pilot reference signal includes a demodulation pilot reference signal corresponding to the broadcast channel. At this time, the second terminal device generates the 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 broadcast times index. Referring to FIG. 8 , the specific implementation process of S404 may include: :

S4044. The second terminal device determines the initial value of the pseudo-noise PN sequence according to the identifier of the first terminal device and the broadcast times index.

Wherein, the identifier of the first terminal device includes the identifier of the first terminal device on the synchronization channel.

The broadcast number index represents 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 the broadcast message is sent in each time period, or the second terminal device blindly checks the maximum number of times the broadcast message is sent in each time period.

When determining the initial value of the PN sequence of the broadcast channel, the specific form of the identification of the first terminal device used in S4044 still needs to be consistent with the specific form of the identification of the first terminal device used in S4014. Moreover, the initial value of the PN sequence also needs to satisfy formula (19).

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 of the first terminal device and the broadcast times index, thereby providing information support for the local end to generate the second demodulation pilot reference signal.

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

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

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; The signal is a signal generated based on the initial value of the PN sequence determined in S4042, then 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, based on the calculation The obtained correlation selects a pilot configuration index, and uses the second demodulation pilot reference information corresponding to the pilot configuration index for channel estimation, so as to improve the accuracy of the channel estimation. Referring to FIG. 6 , the process of selecting the second demodulation pilot reference signal for channel estimation by the second terminal device is as follows:

S406. In the first time slot, the second terminal device determines the 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 resources occupied by the data channel according to the pre-acquired control information, and then randomly determines the position of the first time slot from the time-frequency resources occupied by the data channel, and in the first time slot, A correlation of the first demodulated pilot reference signal and one or more second demodulated pilot reference signals is calculated.

It has been pointed out above that the configuration information of the demodulation pilot reference signals can indicate the position of each demodulation pilot reference signal in a time slot. In the configuration information of the demodulation pilot reference signal, if there is only one column of the first demodulation pilot reference signal in the data channel, the first demodulation pilot reference signal in the column must be mapped to the first pilot of a time slot on the symbol. A column of demodulation pilot reference signals refers to one or more demodulation pilot reference signals along the frequency axis. The first column of first demodulated pilot reference signals refers to one or more first demodulated pilot reference signals on the first pilot symbol in a time slot.

In this embodiment of the present application, one pilot symbol refers to one or more time-domain symbols to which a demodulation pilot reference signal is mapped, which is described here in a unified manner.

In the configuration information, if there are two or more columns of first demodulation pilot reference signals in the data channel, there must be one column of first demodulation pilot reference signals mapped to the first pilot symbol of a time slot. That is, for any pilot configuration index, the first demodulation pilot reference signal exists on the first pilot symbol of a time slot. Specifically, as shown in Table 1, the first demodulation pilot reference signal exists on the first time domain symbol whose index is ₁₀ .

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 manners:

Mode 1: When there is only one column or more than two columns of the first demodulation pilot reference signal in the data channel, calculate the difference between the first demodulation pilot reference signal in the first column and the second demodulation pilot reference signal in the first column. correlation between.

As a possible implementation manner, for each frequency domain unit in the first column, calculate the first demodulation pilot reference signal on the single frequency domain unit in the first column and the single frequency domain unit in the first column. The correlation between the second demodulated pilot reference signals. The calculated correlations are then accumulated to obtain the correlation between the first demodulation pilot reference signal in the first column and the demodulation pilot reference signal in the first column.

Correspondingly, the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals satisfies the following formula:

Among them, h _i represents the first demodulation pilot reference signal of the i-th frequency domain unit on the first pilot symbol of a time slot, i∈{1,2,...,I-1,I}, i Indicates the index of the frequency domain unit, and I is a value determined according to the bandwidth of the data channel and the interval of the frequency domain unit. Exemplarily, each pilot symbol corresponds to one demodulation pilot reference signal. Exemplarily, the frequency domain unit may specifically refer to frequency domain subcarriers.

表示导频配置索引为n_DMRS-index时，第i个频域单元在一个时隙的第一个导频符号上的第二解调导频参考信号的共轭。

Indicates the conjugate of the second demodulation pilot reference signal of the i-th frequency domain unit on the first pilot symbol of a time slot when the pilot configuration index is n _DMRS-index .

n _DMRS-index represents the pilot configuration index of the first demodulation pilot reference signal in the configuration information, and the configuration information whose pilot configuration index is n _DMRS-index is used to indicate: when the pilot configuration index is n _DMRS-index , the The correspondence between the first demodulation pilot reference signal and the time domain symbols in a time slot.

|||| represents the modulo operator.

In this way, the second terminal device can obtain the second demodulation signal for channel estimation only according to the correlation between the first demodulation pilot reference signal in the first column and the second demodulation pilot reference signal in the first column. The frequency reference signal is less computationally intensive, and the accuracy of channel estimation is improved.

Manner 2: The second terminal device calculates all possible correlations between the first demodulation pilot reference signal and the second demodulation pilot reference signal.

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

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

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

Among them, h _i,l represents the first demodulation pilot reference signal of the i-th frequency domain unit on the l-th time-domain symbol of a time slot, i∈{1,2,...,I-1, I}, i represents the index of the frequency domain unit, and I is a value determined according to the bandwidth of the data channel and the interval of the frequency domain unit. Each pilot symbol corresponds to a demodulation pilot reference signal. Exemplarily, the frequency domain unit may specifically refer to frequency domain subcarriers.

表示导频配置索引为n_DMRS-index时第i个频域单元在一个时隙的第l个时域符号中的第二解调导频信号的共轭。

Indicates the conjugate of the second demodulated pilot signal of the i-th frequency domain unit in the l-th time-domain symbol of a time slot when the pilot configuration index is n _DMRS-index .

n _DMRS-index represents the pilot configuration index of the first demodulation pilot reference signal in the configuration information, and the configuration information whose pilot configuration index is n _DMRS-index is used to indicate: when the pilot configuration index is n _DMRS-index , the The corresponding relationship between the pilot symbols in which the first demodulated pilot reference signal is located in a time slot and the time domain symbols.

|||| represents the modulo operator.

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

Among them, h _i,l represents the first demodulation pilot reference signal of the i-th frequency domain unit on the l-th time-domain symbol of a time slot, i∈{1,2,...,I-1,I} , i represents the index of the frequency domain unit, and I is a value determined according to the bandwidth of the data channel and the interval of the frequency domain unit. Each pilot symbol corresponds to a demodulation pilot reference signal. Exemplarily, the frequency domain unit may specifically refer to frequency domain subcarriers.

表示导频配置索引为n_DMRS-index时第i个频域单元在一个时隙的第l个时域符号中的第二解调导频信号的共轭。

Indicates the conjugate of the second demodulated pilot signal of the i-th frequency domain unit in the l-th time-domain symbol of a time slot when the pilot configuration index is n _DMRS-index .

n _DMRS-index represents the pilot configuration index of the first demodulation pilot reference signal in the configuration information, and the configuration information whose pilot configuration index is n _DMRS-index is used to indicate: when the pilot configuration index is n _DMRS-index , the The corresponding relationship between the pilot symbols in which the first demodulated pilot reference signal is located in a time slot and the time domain symbols.

|||| represents the modulo operator.

In this way, the second terminal device calculates the correlation between each first demodulated pilot reference signal and the second demodulated pilot reference signal, improves the accuracy of the correlation calculation result, and then accurately selects the pilot configuration index to obtain A second demodulated pilot reference signal for channel estimation.

S407. Determine a second demodulation pilot reference signal used 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 used for channel estimation includes the second demodulation pilot reference signal with the greatest correlation.

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

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

If the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal is calculated based on formula (22), the second demodulation pilot reference signal used 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 demodulated 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 .

In the following, taking the data channel with the same number of first demodulation pilot reference signals as an example, the information is sent to the first terminal device (the information carries the first demodulation pilot reference signal) and the second terminal device receives and decodes the information process is described in detail. Referring to Figure 9, the method includes the following steps:

S901. The first terminal device performs channel coding on the information to be sent.

S902. The first terminal device generates a first demodulation pilot reference signal corresponding to the data channel.

The specific steps performed by the first terminal device refer to S40110 to S40112 and S402, which will not be repeated here.

It should be noted that, the first terminal device may execute S901 first and then execute S902, or may execute S902 first and then execute S901, or execute S901 and S902 at the same time. The sequence of S901 and S902 is not limited here.

S903: The first terminal device maps the channel-coded information to be sent and the first demodulation pilot reference signal corresponding to the data channel to time-domain resources.

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

S904. The first terminal device performs fast Fourier transform (fast fourier transform, FFT) and framing processing on the information of the time domain resources.

Exemplarily, a header and a trailer are added before and after the FFT-processed data to encapsulate it as 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 markers of the header and trailer.

S905. The first terminal device sends the information that has been encapsulated into a frame to the second terminal device.

Correspondingly, the second terminal device receives the information encapsulated into frames from the first terminal device.

S906 , the second terminal device performs deframe processing and inverse fast fourier transform (IFFT) on the information that has been encapsulated into frames.

S907. The second terminal device performs channel separation on the inverse fast Fourier transformed information, and obtains the first demodulated pilot reference signal and data information.

S908. The second terminal device generates a second demodulation pilot reference signal corresponding to the data channel.

The specific steps performed by the second terminal device refer to S40410 to S40412 and S405, which will not be repeated here.

It should be noted that, the second terminal device may execute S907 first and then execute S908, or may execute S908 first and then execute S907, or execute S907 and S908 simultaneously. The sequence of S907 and S908 is not limited here.

S909. The second terminal device performs channel estimation according to 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.

In this way, the first terminal device and the second terminal device can communicate directly, there is no limitation of the expression space of the demodulation pilot reference signal, and the degree of discrimination between different demodulation pilot reference signals can be improved.

Hereinafter, taking the data channel with variable number of first demodulation pilot reference signals as an example, the first terminal device sends information (the information carries the first demodulation pilot reference signal) and the second terminal device receives and decodes the The information process is explained in detail. Referring to Figure 10, the method includes the following steps:

S1001. The first terminal device performs channel coding on the information to be sent.

S1002. The first terminal device generates a first demodulation pilot reference signal corresponding to the data channel.

Here, for the specific steps performed by the first terminal device, refer to S40110, S40111, S40113 and S402, and details are not repeated here.

S1003. The first terminal device maps the channel-coded information to be sent and the first demodulation pilot reference signal corresponding to the data channel to time domain resources.

Exemplarily, taking the pilot configuration index n _DMRS-index = 1 in Table 1 as an example, the number of first demodulation pilot reference signals included in one transmission time slot is 2, and two first demodulation pilots The location where the reference signal is mapped to the time domain resource is the location where the time domain symbol index in each transmission slot is represented as 1 ₀ and 1 ₀ +7, respectively.

For the execution process of S1004, refer to S904, for the execution process of S1005, refer to S905, and for the execution process of S1006, refer to S906, which will not be repeated here.

S1007. The second terminal device generates a second demodulation pilot reference signal corresponding to the data channel.

The specific steps performed by the second terminal device refer to S40410, S40411, S40413 and S405, and details are not repeated here.

It should be noted that, the second terminal device may execute S1006 first and then execute S1007, or may execute S1007 first and then execute S1006, or execute S1006 and S1007 at the same time. The sequence of S1006 and S1007 is not limited here.

S1008. The second terminal device performs blind detection on the information after the inverse fast Fourier transform according to the generated second demodulated pilot reference signal, and obtains the pilot configuration index used by the first terminal device.

Here, for the specific steps performed by the second terminal device, refer to S406 and S407, which will not be repeated here.

S1009. The second terminal device performs channel separation on the information after the inverse fast Fourier transform according to the pilot configuration index adopted by the first terminal device, and obtains the first demodulated pilot reference signal and data information.

S1010. Perform channel estimation according to the received first demodulated pilot reference signal and the second demodulated pilot reference signal corresponding to the pilot configuration index, and obtain a channel estimation result.

For the execution process of S1011, refer to S910, which is not repeated here.

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

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between different network elements. It can be understood that, in order to implement the above-mentioned functions, the first terminal device and the second terminal device include corresponding hardware structures and/or software modules for executing each function. Combining with the units and algorithm steps of each example described in the embodiments disclosed in this application, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the technical solutions of the embodiments of the present application.

In the embodiment of the present application, the demodulation pilot reference signal generating 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. in the unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and other division methods may be used in actual implementation.

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

The communication unit 1103 may also be divided into a transmitting unit (not shown in FIG. 11 ) and a receiving unit (not shown in FIG. 11 ). The sending unit is used to support the communication apparatus 1100 to send information to other network elements. The receiving unit is configured to support the communication apparatus 1100 to receive information from other network elements.

When the demodulation pilot reference signal generating apparatus 1100 is used to implement the functions of the above-mentioned first terminal apparatus, the processing unit 1102 can be exemplarily used to support the apparatus 1100 to perform S401 and S402 in FIG. 4 , and/or used herein other procedures of the described scheme. The communication unit 1103 is used to support communication between the device 1100 and other network elements (eg, the second terminal device). For example, the communication unit is used to support the apparatus 1100 to perform S403 shown in FIG. 4 , and/or other processes for the solutions described herein.

When the demodulation pilot reference signal generating apparatus 1100 is used to implement the function of the second terminal apparatus in the above method, exemplarily, the processing unit 1102 may be used to support the apparatus 1100 to perform S404, S405 in FIG. 4, and/or Additional procedures for the protocols described herein. The communication unit 1103 is used to support communication between the device 1100 and other network elements (eg, the first terminal device). For example, the communication unit is used to support the apparatus 1100 to perform S403 shown in FIG. 4 , and/or other processes for the solutions described herein.

Optionally, the demodulation pilot reference signal generating 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 not limited to original data or intermediate data.

The processing unit 1102 may be a processor or a controller, for example, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

The communication unit 1103 may be a communication interface, a transceiver or a transceiver circuit, etc., where the communication interface is a general term, and in a specific implementation, the communication interface may include multiple interfaces, for example, may include: terminals and interfaces between terminals and/or or other interfaces.

The storage unit 1101 may be a memory.

When the processing unit 1102 is a processor, the communication unit 1103 is a communication interface, and the storage unit 1101 is a memory, the demodulation pilot reference signal generating apparatus 1200 involved in 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 , and a memory 1201 .

The transceiver 1203 may be an independently set transmitter, and the transmitter may be used to send information to other devices, and the transceiver may also be an independently set receiver, used to receive information from other devices. The transceiver may also be a component that integrates the functions of sending and receiving information, and the specific implementation of the transceiver is not limited in this embodiment of the present application.

Optionally, the apparatus 1200 may further 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 for short) bus or an Extended Industry Standard Architecture (EISA for short) bus etc. The bus 1204 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 12, but it does not mean that there is only one bus or one type of bus.

Those of ordinary skill in the art can understand that: in the above-mentioned embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center The transmission is carried out to another website site, computer, server or data center by wire (eg coaxial cable, optical fiber, Digital Subscriber Line, DSL) or wireless (eg infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, Digital Video Disc (DVD)), or semiconductor media (eg, Solid State Disk (SSD)) )Wait.

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

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

In addition, each functional unit in each embodiment 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 above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

From the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general-purpose hardware, and of course hardware can also be used, but in many cases the former is a better implementation manner . Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that make contributions to the prior art. The computer software products are stored in a readable storage medium, such as a floppy disk of a computer. , a hard disk or an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application.

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

Claims (9)

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 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.

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 the receiver to retrieve the identity of the first terminal device from 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.

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