CN110769495B

CN110769495B - Communication method and device

Info

Publication number: CN110769495B
Application number: CN201810847106.3A
Authority: CN
Inventors: 温容慧; 吕永霞
Original assignee: Zhongmen Junyongsheng R & D Center Meizhou Bay Economic Development Zone Putian City
Current assignee: Fujian Dongwei Jingrui Technology Co ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2021-07-23
Anticipated expiration: 2038-07-27
Also published as: CN110769495A; WO2020020284A1

Abstract

The application provides a communication method and a communication device, wherein the method comprises the steps that terminal equipment determines a time synchronization period, and the time synchronization period is N times of a sending period of a first signal; n is more than or equal to 2 and is an integer; the terminal device determines a target signal group, wherein the target signal group is a signal group used for time synchronization, the target signal group is one of N groups of first signals transmitted or received by the terminal device in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period. The terminal device can determine the target signal group according to the first indication information or protocol agreement sent by the network device, so that the target signal group for time synchronization determined by the network device is the same as the target signal group for time synchronization determined by the terminal device, and the reliability of time synchronization is ensured.

Description

Communication method and device

Technical Field

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

Background

Wireless communication technology has penetrated many traditional industries and has spawned many emerging applications such as autopilot, telemedicine, smart robots, and the like. The intelligent robot is an important application in the field of modern industrial control, and not only is a communication network of the robot required to achieve a low-delay and high-reliability data transmission function; but also to obtain uniform, standard clock information from the communication network to ensure interoperability between robots. Currently, in some high-precision industrial control fields, the absolute clock deviation between robots is required to be within 1 us.

The access network device serves as an integrated controller of the terminal device, and can provide a time synchronization source for the terminal device, that is, time information is sent to the terminal device, so that the terminal device and the network device in a cell keep time synchronization, and the time synchronization requirement between the terminal devices is indirectly met. Currently, the communication between the access network device and the terminal includes the following steps: 1) the access network equipment configures the initialization parameter of clock synchronization for the terminal equipment; 2) at an appointed time point, the access network equipment sends a downlink time reference signal to the terminal equipment, the access network equipment records the sending time T1 of the downlink time reference signal, and the terminal equipment records the receiving time T2 of the downlink time reference signal; 3) the access network equipment sends the timestamp information T1 to the terminal equipment; 4) at an appointed time point, the terminal equipment sends an uplink time reference signal to the access network equipment, the terminal equipment records the sending time T3 of the uplink time reference signal, and the access network equipment end records the receiving time T4 of the uplink time reference signal; 5) the access network equipment sends the timestamp information T4 to the terminal equipment end; 6) the terminal device calculates the deviation DeltaT of the local clock relative to the access network device clock according to the time stamp information T1, T2, T3 and T4, and corrects the local clock accordingly.

The sending period of the signal used for synchronization may be different from the period of the terminal for time synchronization, i.e. the time synchronization period is N times of the sending period of the signal used for synchronization, and N ≧ 2. Thus, it is possible that the understanding of which of the N sets of signals transmitted in one synchronization signal period is used for synchronization at both ends of transmission and reception is inconsistent, and thus the reliability of time synchronization is not high.

Disclosure of Invention

The application provides a communication method and device, and the reliability of time synchronization is improved.

In a first aspect, an embodiment of the present application provides a communication method, including:

the method comprises the steps that a network device generates first indication information, wherein the first indication information indicates a target signal group used for time synchronization, the target signal group is one of N groups of first signals sent or received by a terminal device in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period; n is not less than 2 and is an integer;

and the network equipment sends the first indication information to the terminal equipment.

The network device sends the first indication information indicating the target signal group for time synchronization to the terminal device, and the terminal device can acquire the target signal group according to the first indication information, so that the target signal group for time synchronization determined by the network device is the same as the target signal group for time synchronization determined by the terminal device, and the reliability of time synchronization is ensured.

In a second aspect, an embodiment of the present application provides a method for communication, including:

the terminal equipment determines a time synchronization period, wherein the time synchronization period is N times of the sending period of the first signal; n is not less than 2 and is an integer;

the terminal device determines a target signal group, wherein the target signal group is a signal group used for time synchronization, the target signal group is one of N groups of first signals sent or received by the terminal device in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period.

In one embodiment, the terminal device may determine the target signal group for time synchronization through a preset rule (e.g., a protocol agreed rule);

in another embodiment, the terminal device receives first indication information from a network device; the first indication information indicates the target signal group;

the terminal equipment determines a target signal group, and comprises the following steps:

and the terminal equipment determines the target signal group according to the first indication information.

The terminal equipment can determine the target signal group according to a preset rule or an instruction of the network equipment, and the target signal group for time synchronization determined by the terminal equipment is the same as the target signal group for time synchronization determined by the network equipment, so that the reliability of time synchronization is ensured.

In one possible design, the first indication information includes:

indicating the terminal equipment to send or receive the information of the frame number of the system frame corresponding to the time domain resource of the target signal group; alternatively, the first and second electrodes may be,

indicating the terminal equipment to send or receive the subframe number of the subframe corresponding to the time domain resource of the target signal group and the frame number of the system frame to which the subframe belongs; alternatively, the first and second electrodes may be,

and indicating the terminal equipment to send or receive the information of the time slot number of the time slot corresponding to the time domain resource of the target signal group, the subframe number of the subframe to which the time slot belongs and the frame number of the system frame to which the subframe belongs.

The time slot number of the time slot corresponding to the time domain resource for sending or receiving the target signal group, the subframe number of the subframe to which the time slot belongs and the frame number of the system frame to which the subframe belongs are easy to obtain, so that the generation of the first indication information in the possible design is convenient.

In a possible design based on the first aspect or the second aspect, the first indication information includes: information indicating that the target signal group is an nth group signal of the N groups of first signals; n is more than or equal to 1 and less than or equal to N.

In this possible design, the signaling overhead of the first indication information is relatively small.

In a possible design based on the first aspect or the second aspect, the first indication information includes: indicating that a system frame corresponding to a time domain resource for sending or receiving the target signal group by the terminal device is an M-th system frame of M system frames, wherein the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M; alternatively, the first and second electrodes may be,

the first indication information includes: indicating the sub-frame corresponding to the time domain resource for the terminal equipment to send or receive the target signal group as the P-th sub-frame in the P sub-frames₁Sub-frame to pth₂Information of a plurality of subframes, the P subframes being P subframes included in one time synchronization period; 1 is not more than p₁≤P，1≤p₂Less than or equal to P; alternatively, the first and second electrodes may be,

the first indication information includes: indicating the time slot corresponding to the time domain resource for the terminal equipment to send or receive the target signal group as the tth time slot of the T time slots₁Time slot to tth₂Information of a time slot, the T time slots being T time slots included in one of the time synchronization periods; t is not less than 1₁≤T，1≤t₂≤T。

In a possible design based on the first aspect, the method further includes:

the network device generates second indication information, where the second indication information is used to indicate a target symbol, the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the terminal device to transmit or receive the target signal group, and a start time of the target symbol is a time for the terminal device to record and receive or transmit the target signal group;

and the network equipment sends the second indication information to the terminal equipment.

Because the network device indicates the target symbol to the terminal device, if the starting time of the target symbol of the terminal device is the time for the terminal device to record and receive or send the target signal group, and the starting time of the target symbol of the network device is the time for the network device to record and send or receive the target signal group, the time for the terminal device to record and receive or send the target signal group is matched with the time for the network device to record and send or receive the target signal group, so that the precision of time synchronization is ensured.

Based on the second aspect, in one possible design, the method includes:

the terminal equipment determines a target symbol, wherein the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the terminal equipment to send or receive the target signal group, and the starting time of the target symbol is the time for the terminal equipment to record the sending or receiving of the target signal group;

in the synchronization process, the starting time of the target symbol recorded by the terminal equipment is the time of the terminal equipment for sending or receiving the target signal group.

In a possible implementation manner, the terminal device determines the target symbol according to a preset rule (such as a rule agreed by a protocol);

in a possible implementation, the terminal device receives second indication information from the network device; the second indication information is used for indicating the target symbol;

the terminal equipment determines a target symbol, and the method comprises the following steps:

and the terminal equipment determines the target symbol according to the second indication information.

Because the terminal device may determine the target symbol according to a preset rule or an instruction of a network device, if the starting time of the target symbol of the terminal device is the time for the terminal device to record and receive or send the target signal group, and the starting time of the target symbol of the network device is the time for the network device to record and send or receive the target signal group, the time for the terminal device to record and receive or send the target signal group is matched with the time for the network device to record and send or receive the target signal group, so that the precision of time synchronization is ensured.

In a possible design based on the first aspect or the second aspect, the target symbol is a first symbol in a time domain resource where the terminal device transmits or receives the target signal group; alternatively, the first and second electrodes may be,

the target symbol is the last symbol in the time domain resource of the target signal group sent or received by the terminal equipment; alternatively, the first and second electrodes may be,

the target symbol is a first symbol of a first time unit; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of the first time unit; alternatively, the first and second electrodes may be,

the target symbol is a first symbol of a second time unit; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a second time unit;

the first time unit is a time slot or a subframe where a first symbol in the time domain resource of the target signal group is sent or received by the terminal device, and the second time unit is a time slot or a subframe where a last symbol in the time domain resource of the target signal group is sent or received by the terminal device.

The determination of the target symbol in this possible design is relatively simple.

In one possible design based on the first aspect or the second aspect, the target signal group includes L clusters of first signals, each cluster of first signals including X first signals; l is more than or equal to 1, X is more than or equal to 2, and L and X are positive integers.

In a possible design according to the first or second aspect, the first and second parts may, in one possible design,

the target symbol is a first symbol in a time domain resource of a first signal of the ith cluster sent or received by the terminal equipment; alternatively, the first and second electrodes may be,

the target symbol is the last symbol in the time domain resource of the first signal of the first cluster sent or received by the terminal equipment; alternatively, the first and second electrodes may be,

the target symbol is a first symbol of a third time unit; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a third time unit; alternatively, the first and second electrodes may be,

the target symbol is a first symbol of a fourth time unit; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a fourth time cell;

wherein L is more than or equal to 1 and less than or equal to L; the third time unit is a time slot or a subframe where a first symbol in the time domain resource of the first cluster of first signals is sent or received by the terminal equipment, and the fourth time unit is a time slot or a subframe where a last symbol in the time domain resource of the first cluster of first signals is sent or received by the terminal equipment.

In a third aspect, an embodiment of the present application provides a first apparatus for communication, including a processing module, a storage module, and a sending module, where the storage module is configured to couple with the processing module and store necessary program instructions and data;

the processing module is configured to generate first indication information, where the first indication information indicates a target signal group used for time synchronization, where the target signal group is one of N groups of first signals sent or received by a second apparatus in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period; n is not less than 2 and is an integer;

the sending module is configured to send the first indication information generated by the processing module to the second apparatus.

In a fourth aspect, an embodiment of the present application provides a second apparatus for communication, including a processing module, and a storage module, where the storage module is configured to couple with the processing module and store necessary program instructions and data;

the processing module is used for determining a time synchronization period, wherein the time synchronization period is N times of the sending period of the first signal; n is not less than 2 and is an integer;

the processing module is further configured to determine a target signal group, where the target signal group is a signal group used for time synchronization, and the target signal group is one of N groups of first signals transmitted or received by the second apparatus in a time synchronization period, where the time synchronization period is a period lasting for one time synchronization period.

In a possible design based on the fourth aspect, the method further includes:

a receiving module, configured to receive first indication information from a first apparatus, where the first indication information indicates the target signal group;

the processing module is specifically configured to determine the target signal group according to the first indication information received by the receiving module.

In one possible design based on the third aspect or the fourth aspect, the first indication information includes:

information indicating a frame number of a system frame corresponding to a time domain resource of the target signal group is transmitted or received by the second device; alternatively, the first and second electrodes may be,

indicating the second device to send or receive information of a subframe number of a subframe corresponding to the time domain resource of the target signal group and a frame number of a system frame to which the subframe belongs; alternatively, the first and second electrodes may be,

and indicating the second device to send or receive the information of the time slot number of the time slot corresponding to the time domain resource of the target signal group, the subframe number of the subframe to which the time slot belongs and the frame number of the system frame to which the subframe belongs.

In one possible design based on the third aspect or the fourth aspect, the first indication information includes: information indicating that the target signal group is an nth group signal of the N groups of first signals; n is more than or equal to 1 and less than or equal to N.

In one possible design based on the third aspect or the fourth aspect, the first indication information includes: indicating that a system frame corresponding to a time domain resource for the second device to transmit or receive the target signal group is an M-th system frame of M system frames, where the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M; alternatively, the first and second electrodes may be,

the first indication information includes: indicating the subframe corresponding to the time domain resource for the second device to transmit or receive the target signal group as the pth subframe of the P subframes₁Sub-frame to pth₂Information of a plurality of subframes, the P subframes being P subframes included in one time synchronization period; 1 is not more than p₁≤P，1≤p₂Less than or equal to P; alternatively, the first and second electrodes may be,

the first indication information includes: indicating the time slot corresponding to the time domain resource for the second device to transmit or receive the target signal group as the tth time slot of the T time slots₁Time slot to tth₂Information of a time slot, the T time slots being T time slots included in one of the time synchronization periods; t is not less than 1₁≤T，1≤t₂≤T。

In a possible design according to the third aspect, the first and second switching elements may,

the processing module is further configured to generate second indication information, where the second indication information is used to indicate a target symbol, the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the second device to transmit or receive the target signal group, and a start time of the target symbol is a time for the second device to record transmission or reception of the target signal group;

the sending module is further configured to send the second indication information generated by the processing module to a second device.

In a possible design based on the fourth aspect, the processing module is further configured to:

determining a target symbol, wherein the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for transmitting or receiving the target signal group by the second device, and the starting time of the target symbol is the time for recording the transmission or reception of the target signal group by the second device;

the processing module is further configured to record, in a synchronization process, a start time of the target symbol as a time when the second device transmits or receives the target signal group.

In a possible design according to the fourth aspect, the first and second switches may be, in one possible design,

the receiving module is further used for receiving second indication information; the second indication information is used for indicating the target symbol;

the processing module is specifically configured to:

and determining the target symbol according to the second indication information.

In a possible design based on the third or fourth aspect, the target symbol is a first symbol in a time domain resource where the second apparatus transmits or receives the target signal group; alternatively, the first and second electrodes may be,

the target symbol is the last symbol in the time domain resource sent or received by the second device; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a second time unit;

the first time unit is a time slot or a subframe where a first symbol in the time domain resource of the target signal group is sent or received by the second device, and the second time unit is a time slot or a subframe where a last symbol in the time domain resource of the target signal group is sent or received by the second device.

In one possible design based on the third or fourth aspect, the target signal group includes L clusters of first signals, each cluster of first signals including X first signals; l is more than or equal to 1, X is more than or equal to 2, and L and X are positive integers.

In a possible design based on the third aspect or the fourth aspect, the target symbol is a first symbol in a time domain resource where the second apparatus transmits or receives the first signal in the ith cluster; alternatively, the first and second electrodes may be,

the target symbol is the last symbol in the time domain resource of the first signal sent or received by the second device in the ith cluster; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a fourth time cell;

wherein L is more than or equal to 1 and less than or equal to L; the third time unit is a time slot or a subframe where a first symbol in the time domain resource of the first cluster of first signals is sent or received by the second device, and the fourth time unit is a time slot or a subframe where a last symbol in the time domain resource of the first cluster of first signals is sent or received by the second device.

In a fifth aspect, the present application provides a readable storage medium, which includes a program or instructions, when the program or instructions are run on a computer, the method according to the first aspect is performed.

In a sixth aspect, the present application provides a readable storage medium, which includes a program or instructions, when the program or instructions is run on a computer, the method according to the second aspect is performed.

In the application, since the network device can send the first indication information indicating the target signal group for time synchronization to the terminal device, the terminal device can acquire the target signal group according to the first indication information; or, the terminal device may obtain the target signal group according to a preset rule, and therefore, the target signal group for time synchronization determined by the network device is the same as the target signal group for time synchronization determined by the terminal device, thereby ensuring the reliability of time synchronization.

Drawings

Fig. 1 is a schematic diagram of a communication system provided in an embodiment of the present application;

fig. 2 is a first flowchart of a method of communication according to an embodiment of the present disclosure;

fig. 3 is a first signaling interaction diagram of a communication method according to an embodiment of the present application;

fig. 4 is a second flowchart of a communication method according to an embodiment of the present application;

fig. 5 is a signaling interaction diagram ii of a communication method according to an embodiment of the present application;

fig. 6 is a flowchart three of a communication method according to an embodiment of the present application;

fig. 7 is a signaling interaction diagram three of a communication method according to an embodiment of the present application;

fig. 8 is a first schematic diagram of a "graph" of equivalent subcarriers of a TRS according to an embodiment of the present application;

fig. 9 is a second schematic diagram of an "coordinate diagram" of an equivalent subcarrier of the TRS according to an embodiment of the present application;

fig. 10 is a fourth flowchart of a method of communication provided by an embodiment of the present application;

fig. 11 is a fourth signaling interaction diagram of a communication method according to an embodiment of the present application;

fig. 12 is a first schematic diagram of a "coordinate diagram" of an equivalent subcarrier of an SRS according to an embodiment of the present application;

fig. 13 is a second schematic diagram of an "coordinate diagram" of an equivalent subcarrier of an SRS according to an embodiment of the present application;

fig. 14 is a signaling interaction diagram five of a communication method according to an embodiment of the present application;

fig. 15 is a sixth signaling interaction diagram of a communication method according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a first apparatus for communication according to an embodiment of the present application;

fig. 17 is a first schematic structural diagram of a second apparatus for communication according to an embodiment of the present disclosure;

fig. 18 is a second schematic structural diagram of a second apparatus for communication according to an embodiment of the present application;

fig. 19 shows a schematic diagram of a possible structure of the network device involved in the above embodiment;

fig. 20 shows a simplified schematic diagram of a possible design structure of the terminal device involved in the above-described embodiment.

Detailed Description

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application, and as shown in fig. 1, the communication system includes a network device and at least one terminal device, and the network device and the at least one terminal device communicate through the following technical solutions according to the embodiments of the present application.

Wherein the network device: a Radio Access Network (RAN) device is a device for accessing a terminal to a wireless Network, and may be a Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB, or eNodeB) in Long Term Evolution (LTE), a relay Station or an Access point, or a Base Station in a 5G Network, and the like, and is not limited herein.

The terminal equipment: which may be wireless or wireline, and which may be a device providing voice and/or other traffic data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a User Device or User Equipment (User Equipment), which are not limited herein.

The following embodiments are used to describe the communication method of the present application in detail, and it should be noted that the following embodiments may be combined with each other, and the description of the same or similar contents is not repeated in different embodiments.

First, a method of determining a communication corresponding to a downlink signal for time synchronization will be described.

Fig. 2 is a first flowchart of a communication method according to an embodiment of the present disclosure, and referring to fig. 2, the method according to the embodiment includes:

step S101, the terminal equipment determines a time synchronization period, wherein the time synchronization period is N times of the sending period of the first signal; n is more than or equal to 2 and is a positive integer;

step S102, the terminal device determines a target signal group for time synchronization, wherein the target signal group is one of N groups of first signals received by the terminal device in one time synchronization period; the time synchronization period is a period of time that lasts one of the time synchronization periods.

Illustratively, in the time synchronization process, the network device sends a downlink signal for time synchronization to the terminal device, and records a first time for sending the downlink signal, and after receiving the downlink signal, the terminal device records a second time for receiving the downlink signal, where the first time and the second time are used for time synchronization between the network device and the terminal device; the application scenario of this embodiment is a scenario in which the time synchronization period of the network device may be N times the transmission period of the first signal, and in this embodiment, the target signal group is a downlink signal used for time synchronization.

That is, the time synchronization period in this embodiment is a time synchronization period of the network device, and the time synchronization period is a period of time lasting for one time synchronization period of the network device. The time synchronization period of the network device may be a period in which the network device transmits the target signal group, or a period in which the terminal device receives the target signal group.

For step S101, the time synchronization period of the network device may be protocol-specified, and the terminal device determines the time synchronization period of the network device through the protocol specification, or the time synchronization period indicated to the terminal device by the network device.

For example, if the time synchronization period is agreed by a protocol, the terminal device determines the time synchronization period according to the agreed protocol;

for example, the time synchronization period is indicated to the terminal device by the network device, and the terminal device determines the time synchronization period after receiving the information indicating the time synchronization period by the network device.

In this embodiment, the first signal may be a downlink signal, and may be any one of the following signals: a synchronization signal or a reference signal. The Synchronization Signal may be a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS). The Reference Signal may be a Channel State Information-Reference Signal (CSI-RS), a Tracking Reference Signal (TRS), a Demodulation Reference Signal (DM-RS), or the like. The transmission period of the CSI-RS may be configured to be 2ms, 5ms, 8ms, 10ms, 16ms, 20ms, 32ms, 40ms, 64ms, 80ms, 160ms, 320ms, or 640ms, and the like, and the transmission period of the TRS may be configured to be 10ms, 20ms, 40ms, or 80ms, and the like.

For example, if the first signal is a TRS, the transmission period of the TRS is configured to be 20ms, and the time synchronization period configured by the network device is 100ms, the time synchronization period of the network device is 5 times the transmission period of the TRS.

For step S102, since the time synchronization period of the network device is N times the transmission period of the first signal, the network device will transmit the N sets of first signals to the terminal device in the one time synchronization period, and the terminal device will receive the N sets of first signals in the one time synchronization period, so that the terminal device needs to determine the target signal set for time synchronization received in the one time synchronization period.

It is understood that the target signal group in this embodiment may be one of N groups of first signals received by the terminal device in one time synchronization period, or may be one of N groups of first signals transmitted by the network device in one time synchronization period; the terminal device receives a set of target signals during each of the time synchronization periods.

Wherein, the target signal group can be specified by the protocol or indicated by the network device.

If the target signal group is specified by the protocol, the terminal device determines which of the N first signals to be received in one of the time synchronization periods is the target signal group according to the information of the target signal group specified by the protocol, for example, the first signal of the N first signals is the target signal group.

If the target signal group is indicated by the network device, the terminal device determines the target signal group according to first indication information indicating the target signal group sent by the network device.

In this embodiment, the downlink signal-target signal group for time synchronization is specified by a protocol or indicated by the network device, so that the terminal device can acquire the target signal group for time synchronization, and thus, the target signal group for time synchronization determined by the network device is the same as the target signal group for time synchronization determined by the terminal device, thereby ensuring the reliability of time synchronization.

It should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

A method for determining, by the terminal device according to the first indication information, a communication corresponding to a target signal group, which is a downlink signal used for time synchronization in the embodiment shown in fig. 2, is described below with a specific embodiment. Fig. 3 is a first signaling interaction diagram of a communication method according to an embodiment of the present application. Referring to fig. 3, the method of the present embodiment includes:

step S201, the network equipment generates first indication information; the first indication information indicates a target signal group for time synchronization, the target signal group being one of N groups of first signals received by the terminal device within a time synchronization period, the time synchronization period being a period of time lasting one time synchronization period; n is more than or equal to 2 and is an integer;

step S202, the network device sends the first indication information to the terminal device;

step S203, the terminal device determines the target signal group according to the first indication information.

Specifically, for step S201, in the scenario of the embodiment shown in fig. 2, the network device may indicate which one of the N sets of first signals received by the terminal device in the one time synchronization period is a downlink signal for time synchronization, or the network device may indicate which one of the N sets of first signals received by the terminal device in the one time synchronization period is the target signal set for time synchronization; therefore, the network device generates the first indication information indicating the target signal group for time synchronization, the target signal group being one of the N first signals received by the terminal device in the one time synchronization period, the time synchronization period being a period of time lasting for the one time synchronization period; n is not less than 2 and is an integer.

For example, the first signal is a TRS, a transmission period of the TRS is configured to be 20ms, the network device is configured to have a time synchronization period of 100ms, and a time synchronization period of the network device is 5 times a transmission period of the TRS, and the network device may transmit the TRS 5 times within one time synchronization period, where the network device transmits one set of TRSs at a time, that is, the network device transmits 5 sets of TRSs within the one time synchronization period. The network device generates the first indication information, where the first indication information is used to indicate which one of the 5 sets of TRSs sent by the network device in the one time synchronization period is a signal for time synchronization, or the first indication information is used to indicate which one of the 5 sets of TRSs received by the terminal device in the one time synchronization period is a signal for time synchronization.

The first indication information will be described in detail below.

The first indication information may include: and indicating the terminal equipment to receive at least one of the information of the time slot number of the time slot corresponding to the time domain resource of the target signal group, the subframe number of the subframe and the frame number of the system frame. Specifically, the method comprises the following steps:

in a first embodiment, the first indication information includes: indicating the terminal equipment to receive the frame number information of the system frame corresponding to the time domain resource of the target signal group;

before performing time synchronization, the network device and the terminal device may agree on which downlink signal is used as the signal for time synchronization, for example, it is agreed that the TRS is used as the signal for time synchronization. When the transmission period of the TRS is longer than 10ms of a system frame, the network device determines that a set of TRSs transmitted for the third time in the time synchronization period is the target signal set, and the first indication information may include: and indicating the frame number information of the system frame corresponding to the time domain resource of the group of TRSs sent by the network device for the third time, wherein the frame number of the system frame corresponding to the time domain resource of the group of TRSs sent by the network device for the third time is the frame number of the system frame corresponding to the time domain resource of the target signal group received by the terminal device.

In a second embodiment, the first indication information includes: indicating the terminal equipment to receive the information of the subframe number of the subframe corresponding to the time domain resource of the target signal group and the frame number of the system frame to which the subframe belongs;

for example, if the network device determines that a set of TRSs transmitted for the third time in a time synchronization period is the target signal set, the first indication information may include: and indicating the subframe number of the subframe corresponding to the time domain resource of the group of TRSs and the frame number information of the system frame to which the subframe belongs, wherein the subframe number of the subframe corresponding to the time domain resource of the group of TRSs and the frame number of the system frame to which the subframe belongs are the subframe number of the subframe corresponding to the time domain resource of the target signal group and the frame number of the system frame to which the subframe belongs, which are received by the terminal equipment.

It can be understood that the subframe corresponding to the time domain resource for transmitting the first signal by the network device at a time may be one subframe, or may be a plurality of adjacent subframes, such as at least two adjacent subframes, or the subframe corresponding to the time domain resource for receiving the first signal by the terminal device at a time may be one subframe, or may be a plurality of adjacent subframes, such as at least two adjacent subframes.

In a third embodiment, the first indication information includes: and indicating the terminal equipment to receive the information of the time slot number of the time slot corresponding to the time domain resource of the target signal group, the subframe number of the subframe to which the time slot belongs and the frame number of the system frame to which the subframe belongs.

For example, if the network device determines that a set of TRSs transmitted by the network device for the second time in one of the time synchronization periods is the target signal set, the first indication information may include: indicating the timeslot number of the timeslot corresponding to the time domain resource of the group of TRSs sent by the network device for the second time, the subframe number of the subframe to which the timeslot belongs, and the frame number information of the system frame to which the subframe belongs, where the timeslot number of the timeslot corresponding to the time domain resource of the group of TRSs sent by the network device for the second time, the subframe number of the subframe to which the timeslot belongs, and the frame number of the system frame to which the subframe belongs are the timeslot number of the timeslot corresponding to the time domain resource for which the terminal device receives the target signal group, the subframe number of the subframe to which the timeslot belongs, and the frame number of the system frame to which the subframe belongs.

It is to be understood that the time slot corresponding to the time domain resource for the network device to transmit the first signal each time may be one time slot, or may be multiple adjacent time slots, such as at least two adjacent time slots, or the time slot corresponding to the time domain resource for the terminal device to receive the first signal each time may be one time slot, or may be multiple adjacent time slots, such as at least two adjacent time slots.

The first indication information can also be implemented in the following ways:

in a fourth embodiment, the first indication information includes: information indicating that the target signal group is an nth group signal among the N groups of first signals; n is more than or equal to 1 and less than or equal to N.

For example, during the one time synchronization period, the network device may transmit N sets of first signals, and the first signal transmitted N times may be referred to as an nth set of signals in the N sets of first signals. The network device determines that the first signal sent for the first time in the time synchronization period is the target signal group, and the first indication information includes: information indicating that the target signal group is a group 1 signal of the N groups of first signals; or the network device determines that the first signal sent for the second time in the one time synchronization period is the target signal group, the first indication information includes: information indicating that the target signal group is a group 2 signal of the N groups of first signals.

In a fifth implementation, the first indication information includes: indicating that a system frame corresponding to a time domain resource of the target signal group received by the terminal device is an M-th system frame of the M system frames, wherein the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M.

Illustratively, 10 system frames are included in one time synchronization period, the network device determines that the first signal sent for the third time in the one time synchronization period is the target signal group, the system frame corresponding to the time domain resource where the network device sends the first signal for the third time is the 7 th system frame in the 10 system frames, and then the terminal device receives the system frame corresponding to the time domain resource of the target signal group and is the 7 th system frame in the 10 system frames, where the first indication information includes; information indicating the 7 th systematic frame, i.e., the m is 7.

In this embodiment, the number of bits occupied by the first indication information is smaller than that occupied by the first embodiment.

In a sixth implementation, the first indication information includes: indicating the sub-frame corresponding to the time domain resource of the target signal group received by the terminal equipment as the P-th sub-frame in the P sub-frames₁Sub-frame to pth₂Information of a plurality of subframes, wherein the plurality of subframes are P subframes included in the time synchronization period; 1 is not more than p₁≤P，1≤p₂P is less than or equal to P. Wherein, the p is₁And p is₂May be the same, the p₁And p is₂Is related to the kind of the first signal.

For example, 100 subframes are included in the one time synchronization period, the network device determines that the first signal sent for the fourth time in the one time synchronization period is the target signal group, a subframe corresponding to a time domain resource where the network device sends the first signal for the fourth time is a 61 st subframe of the 100 subframes, and then the subframe corresponding to the time domain resource where the terminal device receives the target signal group is the 61 st systematic frame of the 100 subframes, where the first indication information may include; information indicating the 61 st subframe, i.e., the p₁And p is₂The same is 61.

In this embodiment, the number of bits occupied by the first indication information is smaller than that occupied by the second embodiment.

In a seventh implementation, the first indication information includes: indicating the time slot corresponding to the time domain resource of the target signal group received by the terminal equipment to be the T-th time slot of the T time slots₁Time slot to tth₂Information of a time slot, the T time slots being T time slots included in the one time synchronization period; t is not less than 1₁≤T，1≤t₂T is less than or equal to T. Wherein, t is₁And t is₂Can be the same as t₁And t is₂Is related to the kind of the first signal.

Specifically, 200 time slots are included in one time synchronization period, the network device determines that the first signal sent for the fourth time in the one time synchronization period is the target signal group, the time slots corresponding to the time domain resource where the network device sends the first signal for the fourth time are 161 th time slots and 162 th time slots of the 200 time slots, and the time slots corresponding to the time domain resource where the terminal device receives the target signal group are the 161 th time slots and the 162 th time slots of the 200 time slots, where the first indication information may include; information indicating the 161 th and 162 th slots, i.e., the t₁Is 161, this t₂Is 162.

In this embodiment, the number of bits occupied by the first indication information is smaller than that occupied by the third embodiment.

For step S202, after the network device generates the first indication information, the network device sends the first indication information to the terminal device;

for step S203, after receiving the first indication information, the terminal device determines a downlink signal for time synchronization, that is, determines the target signal group, according to the first indication information;

specifically, for example: the first indication information includes a subframe number of a subframe corresponding to the time domain resource indicating that the terminal device receives the target signal group and frame number information of a system frame where the subframe is located, and the terminal device determines that the first signal received at the frame number is the target signal group.

For another example: the first indication information includes: and if the target signal group is the information indicating that the target signal group is the nth group of signals in the N groups of first signals transmitted in the one synchronization cycle period, the terminal device determines that the first signal received the nth time in the one time synchronization cycle is the target signal group.

Through the process, the network equipment indicates the downlink signal for time synchronization, namely the target signal group, to the terminal equipment, so that the terminal equipment can know the target signal group for time synchronization, and thus, the target signal group for time synchronization determined by the network equipment and the target signal group for time synchronization determined by the terminal equipment ensure the reliability of time synchronization.

Next, a method for determining communication corresponding to the time-synchronized uplink signal will be described.

Fig. 4 is a second flowchart of a communication method according to an embodiment of the present application; referring to fig. 4, the method in the present embodiment includes:

step S301, the terminal device determines a time synchronization period, wherein the time synchronization period is N times of the sending period of the first signal; n is more than or equal to 2 and is a positive integer;

step S302, the terminal device determines a target signal group for performing time synchronization, where the target signal group is one of N first signals sent by the terminal device in one time synchronization period, and the time synchronization period is a period lasting for one time synchronization period.

Specifically, in the time synchronization process, the terminal device sends an uplink signal for time synchronization to the network device, and records a third time for sending the uplink signal, after receiving the uplink signal, the network device records a fourth time for receiving the uplink signal, and the third time and the fourth time are used for time synchronization between the network device and the terminal device; the application scenario of this embodiment is a scenario in which the time synchronization period of the terminal device is N times the transmission period of the first signal; and the uplink signal for time synchronization is the target signal group in this embodiment.

That is, the time synchronization period in this embodiment is a time synchronization period of the terminal device, and the time synchronization period is a period of time lasting for one time synchronization period of the terminal device. The time synchronization period of the terminal device is a period in which the terminal device transmits the target signal group, or a period in which the network device receives the target signal group.

For step S301, the time synchronization period of the terminal device may be specified by a protocol, or may be indicated to the terminal device by the network device.

The time synchronization period may be agreed upon by a protocol, and the terminal device determines the time synchronization period according to the agreed upon protocol.

The time synchronization period may be indicated to the terminal device by the network device, and the terminal device determines the time synchronization period after receiving the information indicating the time synchronization period by the network device.

In this embodiment, the first signal is an uplink signal, and the first signal may be: a Sounding Reference Signal (SRS), a Tracking Reference Signal (TRS), a Demodulation Reference Signal (DM-RS), and so on. The SRS transmission period may be configured to be 2ms, 8ms, 10ms, 16ms, 20ms, 32ms, 40ms, 64ms, 80ms, 160ms, or 320ms, and so on.

For example, the first signal is an SRS, a transmission period of the SRS is configured to be 10ms, the time synchronization period configured by the network device is 100ms, and the time synchronization period of the network device is 10 times the transmission period of the SRS.

It is understood that N in this embodiment may be the same as or different from N in the embodiment shown in fig. 2, because the time synchronization period of the network device and the time synchronization period of the terminal device may be the same or different.

For step S302, since the time synchronization period of the terminal device is N times the transmission period of the first signal, in the one time synchronization period, the terminal device may transmit N sets of the first signals to the network device, and the network device may receive the N sets of the first signals in the one time synchronization period, where the terminal device needs to determine the target signal set for time synchronization transmitted in the one time synchronization period.

It is understood that the target signal group in this embodiment is one of N sets of the first signals transmitted by the terminal device in the one time synchronization period, and is also one of N sets of the first signals received by the network device in the one time synchronization period; the terminal device transmits a group of the target signal in each time synchronization period.

For example, the target signal group is specified by a protocol, and the terminal device determines which of the N first signals transmitted in the one time synchronization period is the target signal group according to the information of the target signal group specified by the protocol, for example, the first signal of the N first signals is specified as the target signal group. After the target signal group is determined, a third time for transmitting the target signal group is recorded when the target signal group is transmitted, so as to synchronize the time of the terminal device and the time of the network device.

Illustratively, the target signal group is indicated by the network device, and the terminal device determines the target signal group according to the first indication information indicating the target signal group sent by the network device.

In this embodiment, the uplink signal for time synchronization is indicated by a protocol rule or network equipment, so that the terminal equipment can acquire a target signal group for time synchronization, and thus, the uplink signal for time synchronization determined by the network equipment is the same as the uplink signal for time synchronization determined by the terminal equipment, thereby ensuring the reliability of time synchronization.

A method for determining, by the terminal device according to the first indication information, a communication corresponding to the uplink signal for time synchronization, i.e., the target signal group in the embodiment shown in fig. 4, is described below with a specific embodiment. Fig. 5 is a signaling interaction diagram ii of a communication method according to an embodiment of the present application. Referring to fig. 5, the method of the present embodiment includes:

step S401, the network device generates first indication information, where the first indication information indicates the target signal group for time synchronization, where the target signal group is one of N first signals sent by the terminal device in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period; n is not less than 2 and is an integer;

step S402, the network device sends the first indication information to the terminal device;

step S403, the terminal device determines the target signal group according to the first indication information.

Specifically, for step S401, in the scenario of the embodiment shown in fig. 4, the network device may indicate which one of the N groups of first signals sent by the terminal device in the one time synchronization period is the uplink signal for time synchronization or the network device may indicate which one of the N groups of first signals sent by the terminal device in the one time synchronization period is the target signal group for time synchronization; therefore, the network device generates the first indication information, where the first indication information indicates the target signal group for time synchronization, where the target signal group is one of N first signals sent by the terminal device in the one time synchronization period, and the time synchronization period is a period of time that lasts for the one time synchronization period; n is not less than 2 and is an integer.

For example, the first signal is an SRS, a transmission period of the SRS is configured to be 10ms, the time synchronization period configured by the network device is 100ms, the time synchronization period of the network device is 10 times the transmission period of the SRS, the SRS is transmitted 10 times in one time synchronization period, and one set of the SRS is transmitted each time, that is, 10 sets of the SRS are transmitted in one time synchronization period. The network device generates the first indication information, where the first indication information is used to indicate which SRS of the 10 SRS groups transmitted by the terminal device in a time synchronization period is a signal for time synchronization.

The first indication information will be described in detail below.

The first indication information may include: and indicating the terminal equipment to send at least one of the information of the time slot number of the time slot corresponding to the time domain resource of the target signal group, the subframe number of the subframe and the frame number of the system frame. Specifically, the method comprises the following steps:

in a first embodiment, the first indication information includes: indicating the terminal equipment to send the information of the frame number of the system frame corresponding to the time domain resource of the target signal group;

in a second embodiment, the first indication information includes: indicating the terminal equipment to send information of the subframe number of the subframe corresponding to the time domain resource of the target signal group and the frame number of the system frame to which the subframe belongs;

in a third embodiment, the first indication information includes: and indicating the terminal equipment to send the information of the time slot number of the time slot corresponding to the time domain resource of the target signal group, the subframe number of the subframe to which the time slot belongs and the frame number of the system frame to which the subframe belongs.

The first indication information may also be implemented as follows:

In a fifth implementation, the first indication information includes: indicating that a system frame corresponding to a time domain resource of the target signal group sent by the terminal device is an M-th system frame of the M system frames, wherein the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M.

In a sixth implementation, the first indication information includes: time domain resource for instructing the terminal device to transmit the target signal groupThe subframe corresponding to the source is the P-th subframe of the P subframes₁Sub-frame to pth₂Information of a plurality of subframes, wherein the plurality of subframes are P subframes included in the time synchronization period; 1 is not more than p₁≤P，1≤p₂P is less than or equal to P. Wherein, the p is₁And p is₂May be the same, the p₁And p is₂Is related to the kind of the first signal.

In a seventh implementation, the first indication information includes: indicating the time slot corresponding to the time domain resource of the target signal group sent by the terminal equipment to be the tth time slot of the T time slots₁Time slot to tth₂Information of a time slot, the T time slots being T time slots included in the one time synchronization period; t is not less than 1₁≤T，1≤t₂T is less than or equal to T. Wherein, t is₁And t is₂Can be the same as t₁And t is₂Is related to the kind of the first signal.

For step S402, after the network device generates the first indication information, the network device sends the first indication information to the terminal device;

for step S403, after receiving the first indication information, the terminal device determines an uplink signal for time synchronization, that is, determines the target signal group.

Specifically, for example: the first indication information includes a subframe number of a subframe corresponding to a time domain resource indicating that the terminal device sends the target signal group and frame number information of a system frame where the subframe is located, and the terminal device determines that the first signal sent on the subframe number of the frame number is the target signal group.

For another example: the first indication information includes: information indicating that the target signal group is the nth group signal among the N groups of first signals, the terminal device determines that the first signal transmitted the nth time over one of the time synchronization periods is the target signal group.

Through the above process, the network device indicates the target signal group, which is the uplink signal for time synchronization, to the terminal device, so that the terminal device can acquire the target signal group for time synchronization, and thus, the uplink signal for time synchronization determined by the network device is the same as the uplink signal for time synchronization determined by the terminal device, and the reliability of time synchronization is ensured.

In the embodiments shown in fig. 2 to fig. 5, the target signal group for time synchronization is determined, and the time point for receiving or transmitting the target signal group recorded by the terminal device or the network device may be agreed in advance, or may be signaled to the terminal device after being determined by the network device. See the description of the examples that follow for details.

In order to allow the terminal device to determine to record the time of receiving the target signal group (the downstream signal for time synchronization), the present embodiment proposes a method of communication. Fig. 6 is a third flowchart of a communication method provided in the embodiment of the present application, and referring to fig. 6, the method of the embodiment includes:

step S501, a terminal device determines a target symbol, wherein the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource of a target signal group received by the terminal device, the target signal group is a signal group used for time synchronization, and the target signal group is a group of signals in H groups of first signals received by the terminal device in a time synchronization period; h is more than or equal to 1; the time synchronization period is a period of time that lasts one of the time synchronization periods.

Step S502, in the synchronization process, the terminal device records the start time of the target symbol as the time when the terminal device receives the target signal group.

Specifically, the meaning of the first signal and the meaning of the time synchronization period in this embodiment are the same as those in the embodiment shown in fig. 2, and are not described herein again. The present embodiment is different from the embodiment shown in fig. 2 in that the time synchronization period of the network device in the present embodiment may be 1 time or more of the transmission period of the first signal, i.e. H ≧ 1.

It is to be understood that when the time synchronization period of the network device is the same as the transmission period of the first signal, the terminal device need not determine the target signal group.

For step S501, the target symbol may be protocol-specified or indicated by the network device.

For example, the target symbol may be protocol-specified, and the terminal device may determine the target symbol according to the protocol specification.

For example, the target symbol may be indicated by the network device, and the terminal device may determine the target symbol according to indication information indicating a second target symbol sent by the network device.

For step S502, in the synchronization process, the terminal device records the starting time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource for the terminal device to receive the target signal group as the time for the terminal device to receive the target signal group; the network device records the starting time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource for sending the target signal group as the time for sending the target signal group by the network device.

It is understood that the start time of the target symbol is different between the network device side and the terminal device side.

In this embodiment, a target symbol is indicated by a protocol rule or a network device, where the start time of the target symbol is the time for a terminal device to record and receive a target signal group, and the target signal group is a downlink signal for time synchronization, so that a first time for the network device to record and send the target signal group is matched with a second time for the terminal device to record and receive the target signal group, and the precision of time synchronization is ensured.

When the embodiment shown in fig. 2 and the embodiment shown in fig. 6 are used in combination, the terminal device can determine the target signal group for time synchronization and also determine the time for recording the received target signal group, so that the target signal group for time synchronization determined by the terminal device is consistent with the target signal group determined by the network device, and the time for recording the received target signal group by the terminal device is matched with the time for recording the transmitted target signal group by the network device, thereby ensuring the reliability and accuracy of time synchronization.

A specific embodiment is adopted to describe a method for determining corresponding communication by a terminal device according to a network device indication in an object symbol in the embodiment shown in fig. 6. Fig. 7 is a signaling interaction diagram three of a communication method according to an embodiment of the present application. Referring to fig. 7, the method of the present embodiment includes:

step S601, the network device generates second indication information, where the second indication information is used to indicate a target symbol, where the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for a terminal device to receive a target signal group, a start time of the target symbol is a time for the terminal device to record and receive the target signal group, the target signal group is a signal group used for time synchronization, the target signal group is a group of signals in an H group of first signal groups received by the terminal device in a time synchronization period, and the time synchronization period may be a period lasting for one time synchronization period; h is more than or equal to 1;

step S602, the network device sends the second indication information to the terminal device;

step S603, the terminal device determines the target symbol according to the second indication information.

Specifically, in order to ensure the accuracy of time synchronization, each group of the first signals may include a plurality of first signals, the time domain resources occupied by the first signals may be different, or the target signal group may be sent within a time length range, so that the network device needs to specify which time point is to be recorded as a first time for sending the target signal group, and a second time recorded by the terminal device for receiving the target signal group needs to be matched with the first time; on the network device side, the network device records the start time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource that transmits the target signal group as the first time to transmit the target signal group, and the network device may indicate the target symbol to the terminal device, so that the terminal device records the start time of the target symbol as the second time to receive the target signal group.

The target symbol may be a symbol in any of the following embodiments.

In a first embodiment, the target symbol is the first symbol in the time domain resource where the terminal device receives the target signal group.

Illustratively, the target signal group is a group of the first signals, the network device determines that a first symbol in the time domain resource that transmits the target signal group is the target symbol, and then the target symbol indicated by the second indication information is the first symbol in the time domain resource that the network device transmits the target signal group; it can be understood that the first symbol of the time domain resource of the target signal group sent by the network device is the first symbol of the time domain resource of the target signal group received by the terminal device.

In a second embodiment, the target symbol is the last symbol in the time domain resource where the terminal device receives the target signal group.

Illustratively, the target signal group is a group of the first signals, the network device determines that the last symbol in the time domain resource transmitting the target signal group is the target symbol, and then the target symbol indicated by the second indication information is the last symbol in the time domain resource occupied by the network device transmitting the target signal group; it can be understood that the last symbol in the time domain resource occupied by the network device for transmitting the target signal group is the last symbol in the time domain resource for receiving the target signal group by the terminal device.

In a third embodiment, the target symbol is a first symbol of a first time unit, and the first time unit is a time slot or a subframe or a system frame in which the first symbol in the time domain resource of the target signal group is received by the terminal device;

illustratively, the target signal group is a group of the first signals, the network device determines that a first symbol of a timeslot where the first symbol in the time domain resource that transmits the target signal group is the target symbol, and then the target symbol indicated by the second indication information is the first symbol of the timeslot where the first symbol in the time domain resource that transmits the target signal group is located. It can be understood that the first symbol of the time slot where the first symbol in the time domain resource of the target signal group is sent by the network device is the first symbol of the time slot where the first symbol in the time domain resource of the target signal group is received by the terminal device.

It can be understood that, if the first symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the time slot in which it is located, the first embodiment is the same as the third embodiment; or the terminal device receives the last symbol of the time domain resource of the target signal group, which is the first symbol of the time slot in which the terminal device receives the first symbol of the time domain resource of the target signal group, and the second implementation mode is the same as the third implementation mode;

alternatively, the first and second electrodes may be,

the target signal group is a group of the first signals, the network device determines that the first symbol of the subframe where the first symbol in the time domain resource of the target signal group is sent by the network device is the target symbol, and the target symbol indicated by the second indication information is the first symbol of the subframe where the first symbol in the time domain resource of the target signal group is sent by the network device. It can be understood that the first symbol of the subframe where the first symbol in the time domain resource of the target signal group is sent by the network device is the first symbol of the subframe where the first symbol in the time domain resource of the target signal group is received by the terminal device.

It can be understood that, if the first symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the subframe where it is located, the first embodiment is the same as the third embodiment; or the terminal device receives the last symbol of the time domain resource of the target signal group, which is the first symbol of the subframe where the first symbol of the time domain resource of the target signal group is received, and the second implementation mode is the same as the third implementation mode; alternatively, the first and second electrodes may be,

the target signal group is a group of the first signals, the network device determines that the first symbol of the system frame where the first symbol in the time domain resource of the target signal group sent by the network device is located is the target symbol, and the target symbol indicated by the second indication information is the first symbol of the system frame where the first symbol in the time domain resource of the target signal group sent by the network device is located. It can be understood that the first symbol of the system frame where the first symbol in the time domain resource of the target signal group is sent by the network device is the first symbol of the system frame where the first symbol in the time domain resource of the target signal group is received by the terminal device;

it can be understood that, if the first symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the system frame where it is located, the first embodiment is the same as the third embodiment; if the last symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the system frame where the first symbol of the time domain resource of the target signal group received by the terminal device is located, the second embodiment is the same as the third embodiment.

In a fourth embodiment, the target symbol may be a last symbol of a first time unit, where the first time unit is a timeslot or a subframe or a system frame where the terminal device receives a first symbol in the time domain resource of the target signal group.

Illustratively, the target signal group is a group of the first signals, the network device determines that the last symbol of the time slot where the first symbol in the time domain resource of the target signal group is sent by the network device is the target symbol, and then the target symbol indicated by the second indication information is the last symbol of the time slot where the first symbol in the time domain resource of the target signal group is sent by the network device. It can be understood that the last symbol of the time slot in which the first symbol in the time domain resource of the target signal group is sent by the network device is the last symbol of the time slot in which the first symbol in the time domain resource of the target signal group is received by the terminal device.

It can be understood that, if the first symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the time slot in which the terminal device is located, the fourth embodiment is the same as the first embodiment; if the last symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the time slot in which the first symbol of the time domain resource of the target signal group received by the terminal device is located, the fourth implementation mode is the same as the second implementation mode;

alternatively, the first and second electrodes may be,

the target signal group is a group of the first signals, the network device determines that the last symbol of the subframe where the first symbol in the time domain resource of the target signal group is sent by the network device is the target symbol, and the target symbol indicated by the second indication information is the last symbol of the subframe where the first symbol in the time domain resource of the target signal group is sent by the network device. It can be understood that the last symbol of the subframe where the first symbol in the time domain resource of the target signal group is sent by the network device is the last symbol of the subframe where the first symbol in the time domain resource of the target signal group is received by the terminal device;

it can be understood that, if the first symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the subframe where the first symbol is located, the fourth embodiment is the same as the first embodiment; or the terminal device receives the last symbol of the time domain resource of the target signal group, which is the last symbol of the subframe where the terminal device receives the first symbol of the time domain resource of the target signal group, the fourth embodiment is the same as the second embodiment;

alternatively, the first and second electrodes may be,

the target signal group is a group of the first signals, the network device determines that the last symbol of the system frame where the first symbol in the time domain resource of the target signal group sent by the network device is located is the target symbol, and the target symbol indicated by the second indication information is the last symbol of the system frame where the first symbol in the time domain resource of the target signal group sent by the network device is located. It can be understood that the last symbol of the system frame where the first symbol in the time domain resource of the target signal group is sent by the network device is the last symbol of the system frame where the first symbol in the time domain resource of the target signal group is received by the terminal device.

It can be understood that, if the first symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the system frame where it is located, the fourth embodiment is the same as the first embodiment; or the last symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the system frame where the first symbol of the time domain resource of the target signal group received by the terminal device is located, the fourth embodiment is the same as the second embodiment.

In a fifth implementation manner, the target symbol is a first symbol of a second time unit, and the second time unit is a time slot or a subframe or a system frame in which a last symbol in the time domain resource of the target signal group is received by the terminal device.

Illustratively, the target signal group is a group of first signals, the network device determines that the first symbol of the slot in which the last symbol in the time domain resource of the target signal group is transmitted by the network device is the target symbol, and then the target symbol indicated by the second indication information is the first symbol of the slot in which the last symbol in the time domain resource of the target signal group is transmitted by the network device. It can be understood that the first symbol of the time slot in which the last symbol in the time domain resource of the target signal group is transmitted by the network device is the first symbol of the time slot in which the last symbol in the time domain resource of the target signal group is received by the terminal device.

It is understood that, if the last symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the time slot in which the terminal device is located, the fifth embodiment is the same as the second embodiment; or the first symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the time slot in which the last symbol of the time domain resource of the target signal group received by the terminal device is located, the fifth embodiment is the same as the first embodiment.

Alternatively, the first and second electrodes may be,

the target signal group is a group of first signals, the network device determines that a first symbol of a subframe in which a last symbol in the time domain resource in which the network device transmits the target signal group is the target symbol, and the target symbol indicated by the second indication information is the first symbol of the subframe in which the last symbol in the time domain resource in which the network device transmits the target signal group is the target symbol. It can be understood that the first symbol of the subframe in which the last symbol in the time domain resource in which the network device transmits the target signal group is the first symbol of the subframe in which the last symbol in the time domain resource in which the terminal device receives the target signal group is located.

It is understood that, if the last symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the subframe where it is located, the fifth embodiment is the same as the second embodiment; or the first symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the subframe in which the last symbol of the time domain resource of the target signal group received by the terminal device is located, the fifth embodiment is the same as the first embodiment.

Alternatively, the first and second electrodes may be,

the target signal group is a group of the first signals, the network device determines that the first symbol of the system frame where the last symbol in the time domain resource of the target signal group sent by the network device is located is the target symbol, and the target symbol indicated by the second indication information is the first symbol of the system frame where the last symbol in the time domain resource of the target signal group sent by the network device is located. It can be understood that the first symbol of the system frame where the last symbol in the time domain resource of the target signal group is sent by the network device is the first symbol of the system frame where the last symbol in the time domain resource of the target signal group is received by the terminal device.

It can be understood that, if the last symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the system frame where it is located, the fifth embodiment is the same as the second embodiment; or the first symbol of the time domain resource of the target signal group received by the terminal device is the first symbol of the system frame where the last symbol of the time domain resource of the target signal group received by the terminal device is located, the fifth embodiment is the same as the first embodiment.

In a sixth implementation manner, the target symbol is a last symbol of a second time unit, and the second time unit is a time slot or a subframe or a system frame in which the last symbol in the time domain resource of the target signal group is received by the terminal device;

illustratively, the target signal group is a group of the first signals, the network device determines that a last symbol of a timeslot where the last symbol of the time domain resource of the target signal group is sent by the network device is the target symbol, and then the target symbol indicated by the second indication information is the last symbol of the timeslot where the last symbol of the time domain resource of the target signal group is sent by the network device. It can be understood that the last symbol of the time slot in which the last symbol in the time domain resource of the target signal group is sent by the network device is the last symbol of the time slot in which the last symbol in the time domain resource of the target signal group is received by the terminal device.

It can be understood that, if the last symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the time slot in which it is located, the sixth embodiment is the same as the second embodiment; or the first symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the time slot in which the last symbol of the time domain resource of the target signal group received by the terminal device is located, the sixth implementation mode is the same as the first implementation mode.

Alternatively, the first and second electrodes may be,

the target signal group is a group of the first signals, the network device determines that the last symbol of the subframe where the last symbol in the time domain resource of the target signal group is sent by the network device is the target symbol, and the target symbol indicated by the second indication information is the last symbol of the subframe where the last symbol in the time domain resource of the target signal group is sent by the network device. It can be understood that the last symbol of the subframe where the last symbol in the time domain resource of the target signal group is sent by the network device is the last symbol of the subframe where the last symbol in the time domain resource of the target signal group is received by the terminal device;

it can be understood that, if the last symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the subframe where it is located, the sixth embodiment is the same as the second embodiment; or the first symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the subframe where the last symbol of the time domain resource of the target signal group received by the terminal device is located, the sixth implementation manner is the same as the first implementation manner.

Alternatively, the first and second electrodes may be,

the target signal group is a group of first signals, the network device determines that the last symbol of the system frame where the last symbol in the time domain resource of the target signal group is sent by the network device is the target symbol, and the target symbol indicated by the second indication information is the last symbol of the system frame where the last symbol in the time domain resource of the target signal group is sent by the network device. It can be understood that the last symbol of the system frame where the last symbol in the time domain resource of the target signal group is sent by the network device is the last symbol of the system frame where the last symbol in the time domain resource of the target signal group is received by the terminal device;

it can be understood that, if the last symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the system frame where it is located, the sixth embodiment is the same as the second embodiment; or the last symbol of the time domain resource of the target signal group received by the terminal device is the last symbol of the system frame where the last symbol of the time domain resource of the target signal group received by the terminal device is located, the sixth embodiment is the same as the first embodiment.

However, the target symbol is not limited to the symbols described in the above embodiments.

More specifically, the target signal group includes L clusters of the first signals, each cluster of the first signals including X of the first signals; l is more than or equal to 1, X is more than or equal to 2, the definition of the target symbol can be any one of the following symbols:

(1) the target symbol is the first symbol in the time domain resource of the first cluster of the first signal received by the terminal equipment, wherein L is more than or equal to 1 and less than or equal to L;

for example, the target signal group includes 2 clusters of the first signal, then the target symbol may be the first symbol in the time domain resource where the terminal device receives the 1 st cluster of the first signal, or the target symbol may be the first symbol in the time domain resource where the terminal device receives the 2 nd cluster of the first signal.

(2) The target symbol is the last symbol in the time domain resource of the first cluster of the first signal received by the terminal equipment, wherein L is more than or equal to 1 and less than or equal to L;

for example, the target signal group includes 2 clusters of the first signal, and the target symbol may be the last symbol in the time domain resource where the terminal device receives the 1 st cluster of the first signal, or the target symbol may be the last symbol in the time domain resource where the terminal device receives the 2 nd cluster of the first signal.

(3) The target symbol is a first symbol of a third time unit, the third time unit is a time slot or a subframe or a system frame where the first symbol in the time domain resource of the first signal of the first cluster is received by the terminal equipment, wherein L is more than or equal to 1 and less than or equal to L;

for example, the target signal group includes 2 clusters of the first signal, and the target symbol may be a first symbol of a timeslot or a subframe or a system frame in which a first symbol in the time domain resource of the 1 st cluster of the first signal is received by the terminal device, or the target symbol may be a first symbol of a timeslot or a subframe or a system frame in which a first symbol in the time domain resource of the 2 nd cluster of the first signal is received by the terminal device.

(4) The target symbol is the last symbol of a third time unit, the third time unit is a time slot or a subframe or a system frame where the first symbol in the time domain resource of the first signal received by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L;

for example, the target signal group includes 2 clusters of the first signal, and the target symbol may be the last symbol of a timeslot or a subframe or a system frame in which the terminal device receives the first symbol in the time domain resource of the 1 st cluster of the first signal, or the target symbol may be the last symbol of a timeslot or a subframe or a system frame in which the terminal device receives the first symbol in the time domain resource of the 2 nd cluster of the first signal.

(5) The target symbol is the first symbol of a fourth time unit, the third time unit is a time slot or a subframe or a system frame where the last symbol in the time domain resource of the first signal received by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L;

for example, the target signal group includes 2 clusters of the first signal, and the target symbol may be a first symbol of a timeslot or a subframe or a system frame in which a last symbol in the time domain resource of the 1 st cluster of the first signal is received by the terminal device, or the target symbol may be a first symbol of a timeslot or a subframe or a system frame in which a last symbol in the time domain resource of the 2 nd cluster of the first signal is received by the terminal device.

(6) The target symbol is the last symbol of a fourth time unit, the third time unit is a time slot or a subframe or a system frame where the last symbol in the time domain resource of the first signal received by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L;

for example, the target signal group includes 2 clusters of the first signal, and the target symbol may be the last symbol of a timeslot or a subframe or a system frame in which the last symbol in the time domain resource of the first signal in cluster 1 is received by the terminal device, or the target symbol may be the last symbol of a timeslot or a subframe or a system frame in which the last symbol in the time domain resource of the first signal in cluster 2 is received by the terminal device.

The above target symbol is described below by using specific examples, specifically:

fig. 8 is a first schematic diagram of a "coordinate diagram" of an equivalent subcarrier of a TRS provided in an embodiment of the present application, and fig. 9 is a second schematic diagram of a "coordinate diagram" of an equivalent subcarrier of a TRS provided in the embodiment of the present application;

referring to fig. 8, in fig. 8, one TRS is transmitted on each resource element with a shading, and multiple clusters of TRSs are transmitted on each time slot, where the TRSs transmitted on the resource elements with the same shading is a cluster of TRSs (TRS burst). The TRSs sent on all the resource elements with shading in fig. 8 constitute a set of TRSs. The set of TRSs shown in fig. 8 is transmitted during a transmission period of the TRSs. The time-frequency resources occupied by the set of TRSs shown in fig. 8 include the resource elements of all shading in fig. 8.

If the set of TRSs shown in fig. 8 is the target signal set, the target symbol may be 51, and 51 is the first symbol of the time domain resource received by the terminal device; the target symbol may be 52, 52 being the last symbol of the time domain resource for which the terminal device received the target signal group; the target symbol may be 53, 53 is the first symbol of the slot or subframe in which the first symbol 51 of the time domain resource of the target signal group is received by the terminal device; the target symbol may be 54, 54 being the last symbol of the slot in which the terminal device receives the first symbol 51 of the time domain resource of the target signal group; the target symbol may be 55, and 55 is the last symbol of the subframe in which the first symbol 51 of the time domain resource of the target signal group is received by the terminal device; the target symbol may be 56, 56 being the first symbol of the slot in which the terminal device receives the last symbol 52 of the time domain resource of the target signal group.

Referring to fig. 9, in fig. 9, one TRS is transmitted on each resource element with a shading, and a cluster of TRSs is transmitted on one time slot, where TRSs transmitted on resource elements with the same shading are a cluster of TRSs. The TRSs sent on all the resource elements with shading in fig. 9 constitute a set of TRSs. The set of TRSs shown in fig. 9 is transmitted during a transmission period of the TRSs. The time-frequency resources occupied by the set of TRSs shown in fig. 9 include the resource elements of all the shading in fig. 9.

If the set of TRSs shown in fig. 9 is the target signal set, the target symbol may be 61, 61 is the first symbol of the time domain resource for the terminal device to receive the target signal set, and is also the first symbol of the time domain resource for the terminal device to receive the TRS in the 1 st cluster; the target symbol may be 62, 62 is the last symbol of the time domain resource where the terminal device receives the target signal group, and is also the last symbol of the time domain resource where the TRS in the 2 nd cluster is transmitted; the target symbol may be 63, where 63 is the first symbol of the time slot or subframe in which the terminal device receives the first symbol 61 of the time domain resource of the target signal group, and is also the first symbol of the time slot or subframe in which the terminal device receives the first symbol of the time domain resource of the 1 st cluster of TRSs, and is also the first symbol of the subframe in which the terminal device receives the first symbol of the time domain resource of the 2 nd cluster of TRSs or the last symbol; the target symbol may be 64, where 64 is the last symbol of the time slot in which the terminal device receives the first symbol 61 of the time domain resource of the target signal group, and is also the last symbol of the time slot in which the terminal device receives the first symbol of the time domain resource of the 1 st cluster TRS; the target symbol may be 65, and 65 is the last symbol of the subframe in which the terminal device receives the first symbol 61 of the time domain resource of the target signal group, and is also the last symbol of the subframe in which the terminal device receives the first symbol of the time domain resource of the 1 st cluster of TRSs, and is also the last symbol of the time slot or subframe in which the terminal device receives the first symbol or the last symbol of the time domain resource of the 2 nd cluster of TRSs; the target symbol may be 66, 66 is the first symbol of the time slot in which the terminal device receives the last symbol 62 of the time domain resource of the target signal group, and is also the first symbol of the time domain resource in which the terminal device receives the 2 nd cluster TRS or the first symbol of the time slot in which the last symbol is located; the target symbol may be 67, and 67 is the last symbol of the time domain resource of the 1 st cluster TRS received by the terminal device; the target symbol may be 68, and 68 is the first symbol of the time domain resource of the terminal device receiving the 2 nd cluster TRS.

After determining the target symbol, the network device generates the second indication information indicating the target symbol, and sends the second indication information to the terminal device.

The terminal equipment receives the second indication information and determines the target symbol according to the second indication information; and recording the starting time of the target symbol in the time slot or the sub-frame or the system frame corresponding to the time domain resource for receiving the target signal group as the time for receiving the target signal group by the terminal equipment in the synchronization process. Correspondingly, the network device records the start time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource for transmitting the target signal group as the time for the network device to transmit the target signal group in the synchronization process.

In this embodiment, the network device sends the indication information indicating the target symbol to the terminal device, where the start time of the target symbol is the time when the terminal device records and receives the target signal group, and the target signal group is a downlink signal for time synchronization, so that the first time when the network device records and sends the target signal group matches the second time when the terminal device records and receives the target signal group, and reliability and accuracy of time synchronization are ensured.

When the embodiment shown in fig. 3 and the embodiment shown in fig. 7 are used in combination, the terminal device can determine the target signal group for time synchronization according to the indication of the network device, and can also determine and record the time of receiving the target signal group according to the indication of the network device, so that the target signal group for time synchronization determined by the terminal device is consistent with the target signal group determined by the network device, the time of receiving the target signal group recorded by the terminal device is matched with the time of sending the target signal group recorded by the network device, and the reliability and accuracy of time synchronization are ensured.

In order for the network device to determine to record the time when the target signal group (the downstream signal for time synchronization) is transmitted, the present embodiment provides a method of communication. Fig. 10 is a fourth flowchart of a communication method provided in the embodiment of the present application, and referring to fig. 10, the method of the present embodiment includes:

step S701, the terminal equipment determines a target symbol; the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource of a target signal group sent by the terminal equipment; the target signal group is a signal group used for time synchronization, and the target signal group is a group of signals in H groups of first signals sent by the terminal equipment in a time synchronization period; h is more than or equal to 1; the time synchronization period is a period of time lasting one time synchronization period;

step S702, during the synchronization process, the terminal device records the start time of the target symbol as the time when the terminal device sends the target signal group.

Specifically, the meaning of the first signal and the meaning of the time synchronization period in this embodiment are the same as those in the embodiment shown in fig. 4, and are not described herein again.

The present embodiment is different from the embodiment shown in fig. 4 in that the application scenario in the present embodiment is that the time synchronization period of the terminal device may be 1 time or multiple times of the transmission period of the first signal, i.e. H ≧ 1.

It is to be understood that when the time synchronization period of the terminal device is the same as the transmission period of the first signal, the terminal device need not determine the target signal group.

For step S701, the target symbol may be specified by a protocol or may be indicated by a network device.

The target symbol may be protocol-specified, and the terminal device determines the target symbol according to the protocol specification.

The target symbol may be indicated by the network device, and the terminal device determines the target symbol according to the second indication information indicating the target symbol sent by the network device.

For step S702, in the synchronization process, the terminal device records the start time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource for the terminal device to transmit the target signal group as the time for the terminal device to transmit the target signal group; the network device records the starting time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource for receiving the target signal group as the time for the network device to receive the target signal group.

In this embodiment, a target symbol is determined through a network device instruction or a protocol specification, a start time of the target symbol is a time for the terminal device to record and transmit a target signal group, and the target signal group is an uplink signal for time synchronization, so that a fourth time for the network device to record and receive the target signal group is matched with a third time for the terminal device to record and transmit the target signal group, and the precision of time synchronization is ensured.

When the embodiment shown in fig. 4 and the embodiment shown in fig. 10 are used in combination, the terminal device can determine the target signal group for time synchronization and also determine and record the time for transmitting the target signal group, so that the target signal group for time synchronization determined by the terminal device is consistent with the target signal group determined by the network device, and the time for transmitting the target signal group recorded by the terminal device is matched with the time for receiving the target signal group recorded by the network device, thereby ensuring the reliability and accuracy of time synchronization.

A specific embodiment is adopted to describe a method for corresponding communication determined by terminal devices according to network device instructions in the embodiments shown in fig. 10. Fig. 11 is a fourth signaling interaction diagram of a communication method according to an embodiment of the present application. Referring to fig. 11, the method of the present embodiment includes:

step S801, the network equipment generates second indication information; the second indication information is used for indicating a target symbol, the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for sending a target signal group by the terminal equipment, and the starting time of the target symbol is the time for recording and sending the target signal group by the terminal equipment; the target signal group is a signal group used for time synchronization, the target signal group is a group of signals in an H group of first signal groups sent by the terminal equipment in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period; h is more than or equal to 1;

step S802, the network device sends the second indication information to the terminal device;

step S803, the terminal device determines the target symbol according to the second indication information.

Specifically, in order to ensure the accuracy of time synchronization, each group of the first signals includes a plurality of first signals, the time domain resources occupied by each first signal may be different, or the target signal group is sent within a time length range, so that the network device needs to specify which time point is specifically recorded as a third time when the terminal device sends the target signal group, and a fourth time recorded by the network device to receive the target signal group needs to be matched with the third time; the network device may indicate the target symbol to the terminal device, where the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource of the target signal group sent by the terminal device; and at the network equipment side, the network equipment records the starting time of the target symbol as the fourth time for receiving the target signal group, and the terminal equipment records the starting time of the target symbol as the third time for sending the target signal group by the terminal equipment.

The target symbol may be a symbol as described in any of several embodiments below.

In a first embodiment, the target symbol is the first symbol in the time domain resource where the terminal device transmits the target signal group.

In a second embodiment, the target symbol is the last symbol in the time domain resource where the terminal device transmits the target signal group.

In a third embodiment, the target symbol is a first symbol of a first time unit, and the first time unit is a time slot or a subframe or a system frame in which the first symbol in the time domain resource of the target signal group is sent by the terminal device.

In a fourth embodiment, the target symbol is a last symbol of a first time unit, and the first time unit is a time slot or a subframe or a system frame in which a first symbol in the time domain resource of the target signal group is received by the terminal device.

In a sixth implementation manner, the target symbol is a last symbol of a second time unit, and the second time unit is a time slot or a subframe or a system frame in which the last symbol in the time domain resource of the target signal group is received by the terminal device.

More specifically, if the target signal group includes L clusters of the first signals, each cluster of the first signals includes X clusters of the first signals; l is more than or equal to 1, X is more than or equal to 2, the definition of the target symbol can be any one of the following symbols:

(1) the target symbol is the first symbol in the time domain resource of the first cluster of the first signal sent by the terminal equipment, wherein L is more than or equal to 1 and less than or equal to L.

(2) The target symbol is the last symbol in the time domain resource of the first signal sent by the terminal equipment in the first cluster, wherein L is more than or equal to 1 and less than or equal to L.

(3) The target symbol is a first symbol of a third time unit, the third time unit is a time slot or a subframe or a system frame where the first symbol in the time domain resource of the first cluster of first signals sent by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L.

(4) The target symbol is the last symbol of a third time unit, the third time unit is a time slot or a subframe or a system frame where the first symbol in the time domain resource of the first cluster of first signals sent by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L.

(5) The target symbol is the first symbol of a fourth time unit, the third time unit is a time slot or a subframe or a system frame where the last symbol in the time domain resource of the first cluster of first signals sent by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L.

(6) The target symbol is the last symbol of a fourth time unit, the third time unit is a time slot or a subframe or a system frame where the last symbol in the time domain resource of the first cluster of first signals sent by the terminal equipment is located, wherein L is more than or equal to 1 and less than or equal to L.

The above target symbol is illustrated below using specific examples, in particular:

fig. 12 is a first schematic diagram of a "coordinate diagram" of an equivalent subcarrier of an SRS provided in an embodiment of the present application, and fig. 13 is a second schematic diagram of a "coordinate diagram" of an equivalent subcarrier of an SRS provided in an embodiment of the present application;

referring to fig. 12, in fig. 8, one SRS is transmitted on each resource element with a shading, and multiple clusters of SRS are transmitted on each slot shown in fig. 12, where the SRS transmitted on the resource elements with the same shading are a cluster of SRS. The SRS transmitted on all the resource elements with the shading in fig. 12 constitute a set of SRS. The set of SRSs shown in fig. 12 is transmitted within a transmission period of the SRS. The time-frequency resources occupied by the set of SRSs shown in fig. 12 include the resource elements of all the shadings in fig. 12.

If the set of SRS shown in fig. 12 is the target signal set, the target symbol may be 81, where 81 is the first symbol or the last symbol of the time domain resource of the target signal set transmitted by the terminal device; the target symbol may be 82, and 82 is the first symbol of the slot in which the terminal device transmits the first symbol 81 of the time domain resource of the target signal group.

Referring to fig. 13, in fig. 13, one SRS is transmitted on each resource element with a shading, and one cluster of SRS is transmitted on one slot, where the SRS transmitted on the resource element with the same shading is the cluster of SRS. The SRS transmitted on all the resource elements with the shading in fig. 13 constitute a set of SRS. The set of SRSs shown in fig. 13 is transmitted within a transmission period of the SRS. The time-frequency resources occupied by the set of SRSs shown in fig. 9 are the resource elements of all the shadings in fig. 13.

If the set of SRS shown in fig. 13 is the target signal group, the target symbol may be 91, where 91 is the first symbol of the time domain resource where the terminal device transmits the target signal group, and is also the first symbol or the last symbol of the time domain resource where the terminal device transmits the 1 st cluster of SRS; the target symbol may be 92, 92 is the last symbol of the time domain resource where the terminal device transmits the target signal group, and is also the first symbol or the last symbol of the time domain resource where the terminal device transmits the SRS in the 2 nd cluster; the target symbol may be 93, 93 is a first symbol of a slot or a subframe in which the first symbol 91 of the time domain resource of the target signal group is transmitted by the terminal device, is also a first symbol of a slot or a subframe in which the first symbol of the time domain resource of the 1 st cluster SRS is transmitted by the terminal device, and is also a first symbol of a subframe in which the first symbol of the time domain resource of the 2 nd cluster SRS is transmitted by the terminal device; the target symbol may be 94, and 94 is the first symbol of the slot in which the terminal device transmits the last symbol 92 of the time domain resource of the target signal group, and is also the first symbol of the slot in which the first symbol of the time domain resource for transmitting the 2 nd SRS is located.

The terminal equipment receives the second indication information and determines the target symbol according to the second indication information; and recording the starting time of the target symbol in a time slot or a subframe or a system frame corresponding to the time domain resource for sending the target signal group as the time for sending the target signal group by the terminal equipment in the synchronization process. Correspondingly, the network device records the starting time of the target symbol in the time slot or subframe or system frame corresponding to the time domain resource receiving the target signal group as the time when the network device receives the target signal group in the synchronization process.

In this embodiment, a target symbol is indicated by a network device, where the start time of the target symbol is the time when a terminal device records and sends a target signal group, and the target signal group is an uplink signal for time synchronization, so that the fourth time when the network device records and receives the target signal group matches the third time when the terminal device records and sends the target signal group, and the precision of time synchronization is ensured.

When the embodiment shown in fig. 5 and the embodiment shown in fig. 11 are used in combination, the terminal device may determine the target signal group for time synchronization according to the indication of the network device, and may also determine and record the time for transmitting the target signal group according to the indication of the network device, so that the target signal group for time synchronization determined by the terminal device is consistent with the target signal group determined by the network device, and the time for transmitting the target signal group recorded by the terminal device is matched with the time for receiving the target signal group recorded by the network device, thereby ensuring the reliability and accuracy of time synchronization.

The complete flow of time synchronization is described below.

Fig. 14 is a signaling interaction diagram five of a communication method according to an embodiment of the present application. Referring to fig. 14, the method of the present embodiment includes:

step S901, the terminal device determines a first time synchronization period, wherein the first time synchronization period is N times of a sending period of a first signal, N is greater than or equal to 2 and is a positive integer; the first time synchronization period is a time synchronization period of the network device.

Step S902, the terminal device determines a first target signal group, where the first target signal group is a signal group used for time synchronization, the first target signal group is one of N first signals received by the terminal device in a first time synchronization period, and the first time synchronization period is a period lasting for the first time synchronization period.

Step S903, the terminal device determines a first target symbol, where the first target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource in which the terminal device receives the first target signal group.

Step S904, the terminal device records the starting time of the first target symbol as a second time for receiving the first target signal group.

Step S905, the terminal equipment acquires the first time for sending the first target signal group from the network equipment; the first time is a start time of the first target symbol recorded by the network device.

Step S906, the terminal equipment determines a second time synchronization period, wherein the second time synchronization period is F times of the sending period of the second signal, and F is more than or equal to 2 and is a positive integer; the second time synchronization period is the time synchronization period of the terminal device.

In step S907, the terminal device determines a second target signal group, where the second target signal group is a signal group used for time synchronization, the second target signal group is one of F second signals received by the terminal device in a second time synchronization period, and the second time synchronization period is a period lasting for one second time synchronization period.

Step S908, the terminal device determines a second target symbol, where the second target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource of the second target signal group sent by the terminal device.

In step S909, the terminal device records the starting time of the second target symbol as the fourth time for sending the second target signal group.

Step S910, the terminal device obtains a third time for receiving the second target signal group from the network device; the third time is the starting time of the second target symbol recorded by the network device.

Step S911, the terminal device performs time synchronization between the terminal device and the network device according to the first time, the second time, the third time, and the fourth time.

The specific implementation of this embodiment refers to relevant steps in the above embodiments, and is not further described in this embodiment.

In the embodiment shown in fig. 14, the method of the corresponding communication indicated by each target signal group and each target symbol for the network device is described below. Fig. 15 is a sixth signaling interaction diagram of a communication method according to an embodiment of the present application. Referring to fig. 15, the method of the present embodiment includes:

step S1001, the network equipment generates first indication information and second indication information; the first indication information indicates a first target signal group for time synchronization, the first target signal group being one of N groups of first signals received by the terminal device within a first time synchronization period, the first time synchronization period being a period of time lasting for one time synchronization period of the network device; the second indication information is used to indicate a first target symbol, where the first target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the terminal device to receive the first target signal group, and a start time of the first target symbol is a time for the terminal device to record receiving the first target signal group; n is more than or equal to 2 and is an integer;

step S1002, the network device sends the first indication information and the second indication information to the terminal device.

Step S1003, the network device sends N sets of first signals to the terminal device in the first time synchronization period.

Step S1004, the network device records the starting time of the first target symbol as the first time for sending the first target signal group.

Step S1005, the network device sends the first time to the terminal device.

Step S1006, the terminal device determines the first target signal group according to the first indication information, and determines the first target symbol according to the second indication information.

Step S1007, the terminal device records the starting time of the first target symbol as the second time of receiving the first target signal group.

Step S1008, the network device generates third indication information and fourth indication information; the third indication information indicates a second target signal group for time synchronization, where the second target signal group is one of F second signals sent by the terminal device in a second time synchronization period, and the second time synchronization period is a period of time that lasts for one time synchronization period of the terminal device; the fourth indication information is used to indicate a second target symbol, where the second target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the terminal device to transmit the second target signal group, and a start time of the second target symbol is a time for the terminal device to record and transmit the second target signal group; n is not less than 2 and is an integer.

Step S1009, the network device sends the third indication information and the fourth indication information to the terminal device.

Step S1010, the terminal device sends F second signal groups to the network device in the second time synchronization period.

Step S1011, the terminal device determines the second target signal group according to the third indication information, and determines the second target symbol according to the fourth indication information.

Step S1012, the terminal device records the starting time of the second target symbol as a third time for sending the second target signal group.

Step S1013, the network device records the start time of the second target symbol as a fourth time for receiving the second target signal group.

Step S1014, the network device sends the fourth time to the terminal device.

Step S1015, the terminal device performs time synchronization of the terminal device with the network device according to the first time, the second time, the third time and the fourth time.

Specifically, the present embodiment is a complete flow of time synchronization between the terminal device and the network device. The specific implementation of this embodiment refers to relevant steps in the above embodiments, and is not further described in this embodiment.

Fig. 16 is a schematic structural diagram of a first apparatus for communication according to an embodiment of the present application, where the apparatus may be configured to perform a behavior function of a network device in the method embodiments shown in fig. 3 and fig. 5, as shown in fig. 16, the apparatus includes: the system comprises a processing module 11, a storage module 12 and a sending module 13, wherein the storage module 12 is coupled with the processing module 11 and used for storing necessary program instructions and data;

the processing module 11 is configured to generate first indication information, where the first indication information indicates a target signal group used for time synchronization, where the target signal group is one of N groups of first signals sent or received by a second apparatus in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period; n is not less than 2 and is an integer;

the sending module 13 is configured to send the first indication information generated by the processing module 11 to the second device.

In one possible design, the first indication information includes:

In one possible design, the first indication information includes: information indicating that the target signal group is an nth group signal of the N groups of first signals; n is more than or equal to 1 and less than or equal to N.

In one possible design, the first indication information includes: indicating that a system frame corresponding to a time domain resource for the second device to transmit or receive the target signal group is an M-th system frame of M system frames, where the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M; alternatively, the first and second electrodes may be,

In this embodiment, the entity corresponding to the processing module may be a processor, the entity corresponding to the storage module may be a memory, and the entity corresponding to the sending module may be a transmitter.

The specific implementation manner and technical effects of the apparatus provided in this embodiment are similar to those of the embodiments shown in fig. 3 and fig. 5, and are not described herein again.

In a possible design, the processing module 11 is further configured to generate second indication information, where the second indication information is used to indicate a target symbol, where the target symbol is a symbol in a timeslot, a subframe, or a system frame corresponding to a time domain resource for the second device to transmit or receive the target signal group, and a start time of the target symbol is a time for the second device to record transmission or reception of the target signal group;

the sending module 13 is further configured to send the second indication information generated by the processing module 11 to a second device.

In one possible design, the target symbol is a first symbol in a time domain resource where the second apparatus transmits or receives the target signal group; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a second time unit;

In one possible design, the target signal group includes L clusters of first signals, each cluster of first signals including X first signals; l is more than or equal to 1, X is more than or equal to 2, and L and X are positive integers.

In one possible design, the target symbol is a first symbol in a time domain resource where the second apparatus transmits or receives the first signal in the ith cluster; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a fourth time cell;

The specific implementation manner and technical effects of the apparatus provided in this embodiment are similar to those of the embodiments shown in fig. 7 and fig. 11, and are not described again here.

It should be noted that the first apparatus embodiment only shows the structural functions of the first apparatus, and for specific behavior functions, please refer to the method embodiment described above, which is not repeated herein for brevity.

Fig. 17 is a first schematic structural diagram of a second apparatus for communication according to an embodiment of the present application, where the second apparatus may be configured to execute a behavior function of a terminal device in the foregoing method embodiments shown in fig. 2 or fig. 4, and as shown in fig. 17, the apparatus includes: the processing module 21 and the storage module 22, wherein the storage module 22 is coupled to the processing module 21 and stores necessary program instructions and data;

the processing module 21 is configured to determine a time synchronization period, where the time synchronization period is N times of a transmission period of the first signal; n is not less than 2 and is an integer;

the processing module 21 is further configured to determine a target signal group, where the target signal group is a signal group used for time synchronization, and the target signal group is one of N groups of first signals transmitted or received by the second apparatus in a time synchronization period, where the time synchronization period is a period lasting for one time synchronization period.

The specific implementation manner and technical effects of the second apparatus provided in this embodiment are similar to those of the embodiments shown in fig. 2 and fig. 4, and are not described again here.

In this embodiment, the entity corresponding to the processing module may be a processor, and the entity corresponding to the storage module may be a memory.

Fig. 18 is a second schematic structural diagram of a second apparatus for communication according to an embodiment of the present application, and on the basis of the second apparatus shown in fig. 17, the second apparatus further includes: receiving module 23

A receiving module 23, configured to receive first indication information from a first apparatus, where the first indication information indicates the target signal group;

the processing module 21 is specifically configured to determine the target signal group according to the first indication information received by the receiving module.

In one possible design, the first indication information includes:

The apparatus provided in this embodiment may be configured to execute the behavior function of the terminal device in the method embodiment shown in fig. 3 or fig. 5, and the specific implementation manner and the technical effect are also similar to those in fig. 3 or fig. 5, and are not described again here.

In one possible design, the processing module 21 is further configured to:

and determining a target symbol, wherein the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the second device to transmit or receive the target signal group, and the starting time of the target symbol is the time for the second device to record the transmission or reception of the target signal group.

The processing module 21 is further configured to record, in a synchronization process, a start time of the target symbol as a time when the second device transmits or receives the target signal group.

In a possible design, the receiving module 23 is further configured to receive second indication information; the second indication information is used for indicating the target symbol;

the processing module 21 is specifically configured to: and determining the target symbol according to the second indication information.

the target symbol is the last symbol of a second time unit;

the target symbol is the last symbol of a fourth time cell;

In this embodiment, the entity corresponding to the processing module may be a processor, and the entity corresponding to the receiving module may be a receiver.

The apparatus provided in this embodiment may be configured to execute the behavior function of the terminal device in the method embodiment shown in fig. 6 or fig. 7 or fig. 10 or fig. 11, and the specific implementation manner and the technical effect are similar to those in fig. 6 or fig. 7 or fig. 10 or fig. 11, and are not described again here.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It is to be understood that each network element, such as a terminal device, a network device, etc., includes a hardware structure and/or a software module for performing each function in order to implement the functions described above. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

Fig. 19 shows a schematic diagram of a possible structure of the network device involved in the above embodiments.

The network device includes a transmitter/receiver 1001, a controller/processor 1002, and a memory 1003. The transmitter/receiver 1001 is used to support information transceiving between a network device and the terminal device in the above embodiments, and to support radio communication between the terminal device and other terminal devices. The controller/processor 1002 performs various functions for communicating with terminal devices. In the uplink, uplink signals from the terminal device are received via the antenna, conditioned by the receiver 1001, and further processed by the controller/processor 1102 to recover the traffic data and signaling information sent by the terminal device. On the downlink, traffic data and signaling messages are processed by a controller/processor 1002 and conditioned by a transmitter 1001 to generate a downlink signal, which is transmitted via an antenna to terminal devices. Controller/processor 1002 may also perform the processes of fig. 2-15 relating to network devices and/or other processes for the techniques described herein. The memory 1003 is used to store program codes and data of the network device.

Fig. 20 shows a simplified schematic diagram of a possible design structure of the terminal device involved in the above-described embodiment. The terminal device includes a transmitter 1101, a receiver 1102, a controller/processor 1103, a memory 1104 and a modem processor 1105.

The transmitter 1101 conditions (e.g., converts to analog, filters, amplifies, and frequency upconverts, etc.) the output samples and generates an uplink signal, which is transmitted via an antenna to the network devices described in the above embodiments. On the downlink, the antenna receives the downlink signal transmitted by the network device in the above-described embodiment. Receiver 1102 conditions (e.g., filters, amplifies, downconverts, and digitizes, etc.) the received signal from the antenna and provides input samples. In modem processor 1105, an encoder 1106 receives traffic data and signaling messages to be transmitted on the uplink and processes (e.g., formats, encodes, and interleaves) the traffic data and signaling messages. A modulator 1107 further processes (e.g., symbol maps and modulates) the encoded traffic data and signaling messages and provides output samples. A demodulator 1109 processes (e.g., demodulates) the input samples and provides symbol estimates. A decoder 1108 processes (e.g., deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages that are sent to the terminal device. Encoder 1106, modulator 1107, demodulator 1109, and decoder 1108 may be implemented by a combined modem processor 1105. These units perform processing according to the radio access technology (e.g., Long Term Evolution (LTE) and other access technologies of the evolved system) adopted by the radio access network.

The controller/processor 1103 controls and manages the operation of the terminal device, and is configured to execute the processing performed by the terminal device in the above-described embodiment. Such as for controlling the terminal device to determine a set of target signals for time synchronization and/or other processes for the techniques described herein. As an example, the controller/processor 1103 is configured to support the terminal device in performing the processes 101 and 102 in fig. 2, the processes 301 and 302 in fig. 4, the processes 501 and 502 in fig. 6, and the processes 901 and 902 in fig. 10. The memory 1104 is used for storing program codes and data for the terminal device.

For implementing the network devices described above in this application, the controller/processor of the terminal device may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software elements in the decoding processor. The software unit may be located in a Random Access Memory (RAM), a flash memory, a read-only memory (ROM), a programmable ROM, an electrically erasable programmable memory, a register, or other storage media that are well known in the art. The storage medium is located in a memory, and a processor reads instructions in the memory and combines hardware thereof to complete the steps of the method.

An embodiment of the present application provides a computer-readable storage medium, which stores instructions that, when executed, cause a computer to perform a method as performed by a terminal device in the above-mentioned embodiment of the present application.

Embodiments of the present application provide a computer-readable storage medium, which stores instructions that, when executed, cause a computer to perform a method as performed by a network device in the above embodiments of the present application.

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

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

Claims

1. A method of communication, comprising:

2. A method of communication, comprising:

the terminal equipment receives first indication information from network equipment, wherein the first indication information indicates a target signal group; the terminal device determines the target signal group according to the first indication information, wherein the target signal group is a signal group used for time synchronization, the target signal group is one of N groups of first signals sent or received by the terminal device in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period.

3. The method according to claim 1 or 2, wherein the first indication information comprises:

4. The method according to claim 1 or 2, wherein the first indication information comprises: information indicating that the target signal group is an nth group signal of the N groups of first signals; n is more than or equal to 1 and less than or equal to N.

5. The method according to claim 1 or 2, wherein the first indication information comprises: indicating that a system frame corresponding to a time domain resource for sending or receiving the target signal group by the terminal device is an M-th system frame of M system frames, wherein the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M; alternatively, the first and second electrodes may be,

6. The method of claim 1, further comprising:

the network device generates second indication information, where the second indication information is used to indicate a target symbol, the target symbol is a symbol in a time slot or a subframe or a system frame corresponding to a time domain resource for the terminal device to transmit or receive the target signal group, and a start time of the target symbol is a time for the terminal device to record transmission or reception of the target signal group;

7. The method of claim 2, comprising:

8. The method of claim 7, further comprising:

the terminal equipment receives second indication information from the network equipment; the second indication information is used for indicating the target symbol;

9. The method of claim 6, wherein the target symbol is a first symbol in a time domain resource where the terminal device transmits or receives the target signal group; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a second time unit;

10. The method of claim 6, wherein the target signal group comprises L clusters of first signals, each cluster of first signals comprising X first signals; l is more than or equal to 1, X is more than or equal to 2, and L and X are positive integers.

11. The method of claim 10,

the target symbol is the last symbol of a fourth time cell;

12. A first means of communication comprising a processing module, a memory module, and a transmitting module, wherein said memory module is configured to couple to said processing module and store necessary program instructions and data;

13. A second means of communication comprising a processing module, a memory module, and a receiving module, wherein said memory module is configured to couple to said processing module and store necessary program instructions and data;

the receiving module is used for receiving first indication information from a first device, wherein the first indication information indicates a target signal group;

the processing module is further configured to determine the target signal group according to the first indication information received by the receiving module, where the target signal group is a signal group used for time synchronization, the target signal group is one of N groups of first signals sent or received by the second apparatus in a time synchronization period, and the time synchronization period is a period lasting for one time synchronization period.

14. The apparatus according to claim 12 or 13, wherein the first indication information comprises:

15. The apparatus according to claim 12 or 13, wherein the first indication information comprises: information indicating that the target signal group is an nth group signal of the N groups of first signals; n is more than or equal to 1 and less than or equal to N.

16. The apparatus according to claim 12 or 13, wherein the first indication information comprises: indicating that a system frame corresponding to a time domain resource for the second device to transmit or receive the target signal group is an M-th system frame of M system frames, where the M system frames are M system frames included in one time synchronization period; m is more than or equal to 1 and less than or equal to M; alternatively, the first and second electrodes may be,

the first indication information includes: indicating the time slot corresponding to the time domain resource for the second device to transmit or receive the target signal group as the second time slot of the T time slotst₁Time slot to tth₂Information of a time slot, the T time slots being T time slots included in one of the time synchronization periods; t is not less than 1₁≤T，1≤t₂≤T。

17. The apparatus of claim 12,

18. The apparatus of claim 13, wherein the processing module is further configured to:

19. The apparatus of claim 18,

the processing module is specifically configured to:

20. The apparatus of claim 17, wherein the target symbol is a first symbol in a time domain resource where the second apparatus transmits or receives the target signal group; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a second time unit;

21. The apparatus of claim 17, wherein the target signal group comprises L clusters of first signals, each cluster of first signals comprising X first signals; l is more than or equal to 1, X is more than or equal to 2, and L and X are positive integers.

22. The apparatus of claim 21,

the target symbol is a first symbol in a time domain resource of the first signal of the first cluster sent or received by the second device; alternatively, the first and second electrodes may be,

the target symbol is the last symbol of a fourth time cell;

23. A readable storage medium comprising a program or instructions which, when run on a computer, performs the method of any of claims 1, 3-6, 9-11.

24. A readable storage medium comprising a program or instructions for performing the method of any of claims 2-5, 7-11 when the program or instructions are run on a computer.