WO2019101186A1

WO2019101186A1 - Method and apparatus for obtaining timing advance

Info

Publication number: WO2019101186A1
Application number: PCT/CN2018/117333
Authority: WO
Inventors: 卓永宁; 魏冬冬; 朱立东
Original assignee: 华为技术有限公司
Priority date: 2017-11-24
Filing date: 2018-11-24
Publication date: 2019-05-31
Also published as: CN109842932B; CN109842932A

Abstract

Disclosed in embodiments of the present application are a method and apparatus for obtaining a timing advance in a communication network. The method comprises: a terminal determines a difference between time information of the terminal and of the network device by means of information exchange with a network device; the terminal determines a timing advance according to the time information of the terminal and of the network device, or the terminal determines its location information and ephemeris information of the network device according to the information exchange with the network device, and determines the timing advance according to the time information of the terminal and of the network device. The timing advance is obtained directly at the terminal, and timing advance measurement errors during a conventional time synchronization process are reduced, so that an uplink signal sent by the terminal can be correctly decoded, the number of timing advance adjustments is decreased, and signaling overhead is reduced.

Description

Method and device for obtaining timing advance

This application claims priority to the Chinese Patent Application No. 201711189814.4, filed on November 24, 2017, with the application number of "Method and Device for Obtaining Advance Amount", the entire contents of which are incorporated by reference. In this application.

Technical field

The embodiments of the present application relate to communication technologies, and in particular, to time synchronization technologies.

Background technique

In a wireless communication system based on orthogonal frequency division multiplexing (OFDM) technology, in order to ensure orthogonality between uplink transmissions of multiple terminals of an access base station, different terminals according to timing advance (timing) Advance, TA) adjusts the uplink transmission time so that signals transmitted by different terminals arrive at the base station within an error range of the length of a cyclic prefix (CP) to implement uplink synchronization.

In an existing long term evolution (LTE) system, an evolved base station (eNode B) can measure a preamble sequence transmitted by a terminal through a physical random access channel (PRACH). The transmission delay is obtained to obtain the TA value. Then, the TA value is fed back to the terminal in a random access response (RAR) message, and the terminal adjusts its uplink sending time according to the TA value. In the 5G communication system, there is also a process in which the network device measures the TA value and feeds back to the terminal.

However, the cell range and the terminal moving speed to which the TA value acquisition mechanism of the existing LTE system is applied are small. In a communication system in which a network element moves rapidly, the signal coverage of the network device is much larger than that of the ground cell, and the network device moves rapidly relative to the terminal. In such a communication scenario, the method for obtaining the TA value in the existing LTE system has obvious disadvantages: the TA value error is large, and the delay error of different terminals arriving at the base station may exceed the length of one CP, causing the terminal to send The upstream signal cannot be decoded correctly.

Summary of the invention

The embodiment of the present application provides a method and a device for acquiring a timing advance. By acquiring a TA value on the terminal side, the measurement error of the TA value can be reduced, and the uplink signal decoding success rate sent by the terminal is improved.

In a first aspect, the embodiment of the present application provides a method for acquiring a timing advance, where a terminal sends a first message to a network device, where the first message carries first time information of the terminal. The terminal further receives the second message and records the second time information, where the second message is the first time information, the second time information, and the first time of the terminal that the network device carries the network device The message of the information, or the second message is a difference between the first time information of the network device carrying the network device and the first time information of the terminal, and the second time information of the network device Message. The terminal determines a difference from the clock information of the network device according to the time information of the network device and the network device. After determining the difference of the clock information, the terminal receives the third message, where the third message carries the third time information of the network device. The terminal determines a transmission delay of the terminal and the network device according to the third time information of the network device and the third time information of the terminal, to determine a TA value. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced.

In a possible implementation manner, the terminal receives a second message, where the second message carries a difference between the first time information of the network device and the first time information of the terminal, and the network device The second time information. Determining, by the terminal, the difference from the clock information of the network device according to the difference, the first time information of the terminal, and the second time information of the terminal, and determining a difference between the clock information and the network device. And determining a transmission delay of the terminal and the network device to obtain a TA value. Determining the difference between the first time information of the network device and the first time information of the terminal on the network device side, the hardware complexity of the terminal side can be reduced.

In a possible implementation manner, the terminal receives a second message, where the second message carries first time information of the network device, second time information of the network device, and first Time information. Determining, by the terminal, the difference between the clock information of the network device and the clock information of the network device according to the first time information of the network device and the network device, and the second time information of the network device After the difference, the transmission delay of the terminal and the network device is determined to obtain a TA value. Determining the difference between the first time information of the network device and the first time information of the terminal on the terminal side can reduce the hardware complexity of the network device.

In a possible implementation manner, in a random access process, the terminal performs an interaction process with the network device as follows: the terminal sends a first message to the network device. The terminal receives the second message of the network device and records the second time information. After the interaction of the random access process, the terminal determines a difference from the clock information of the network device, and after determining the clock information difference, the terminal further performs the third message according to the third message sent by the network device. The third time information and the third time information of the terminal determine a transmission delay of the terminal and the network device to determine a TA value. The third time information of the network device is carried in the third message, which can save signaling overhead in obtaining the TA value.

In a second aspect, the embodiment of the present application provides a method for acquiring a timing advance, where a network device sends a second message to a terminal, where the second message carries first time information of the network device, and the network device The second time information and the first time information of the terminal, or the second message may also carry a difference between the first time information of the network device and the first time information of the terminal, the network The second time information of the device. The network device sends a third message carrying the third time information of the network device to the terminal. The third time information of the network device is used to determine a transmission delay and a TA value of the terminal and the network device. The terminal determines the transmission delay according to the third time information of the terminal and the third time information of the network device to determine a TA value. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced.

In a possible implementation, the network device sends a second message, where the second message carries a difference between the first time information of the network device and the first time information of the terminal, the network The second time information of the device. Determining the difference between the first time information of the network device and the first time information of the terminal on the network device side, the hardware complexity of the terminal side can be reduced.

In a possible implementation, the network device sends a second message, where the second message carries first time information of the network device, second time information of the network device, and One time information. Determining the difference between the first time information of the network device and the first time information of the terminal on the terminal side can reduce the hardware complexity of the network device.

In a possible implementation manner, the terminal performs the following process of interacting with the network device: the network device sends a second message to the terminal, and the network device sends a third message, The third message carries third time information of the network device. The third time information of the network device is carried in the third message, which can be saved from the TA adjustment signaling of the network device, and the signaling overhead is saved.

In a possible implementation manner, in the contention-based random access procedure, the first message may be a random access preamble message; and the second message may be a random access response message. Optionally, the first message and the second message may also be other messages of the contention based random access procedure, so as to avoid redefining the message.

In a possible implementation, in the contention-based random access procedure, the first message may be a message (Msg) 3; the second message may be a contention resolution message. Optionally, the first message and the second message may also be other messages of the contention based random access procedure, so as to avoid redefining the message.

In a possible implementation manner, in the non-contention based random access procedure, the first message may be a random access preamble message, and the second message may be a random access response message. Optionally, the first message and the second message may also be other messages based on the non-contention random access procedure, so as to avoid redefining the message.

In a possible implementation manner, in a communication scenario between a satellite and a ground terminal using an orthogonal frequency division multiplexing modulation mode, the ground terminal may be a mobile phone, a cellular phone, a personal digital assistant, a handheld device, or the like. The network device can be a satellite or can be a ground station that relays signals by satellite. In the satellite fast mobile communication scenario, obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced.

In a third aspect, an embodiment of the present application provides a terminal, including a transmitter, a receiver, and a processor.

The transmitter is configured to send a first message, where the first message carries first time information of the terminal.

The receiver is configured to receive a second message, where the second message carries first time information of the network device, second time information of the network device, and first time information of the terminal, or the second message carries a difference between the first time information of the network device and the first time information of the terminal, and second time information of the network device; the receiver is further configured to receive a third message, where the third message bearer The third time information of the network device.

Determining, by the processor, the difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, and the second time information of the terminal a difference between the terminal and the clock information of the network device. After determining the clock information difference, the processor determines a transmission delay of the terminal and the network device according to the third time information of the terminal and the third time information of the network device to determine a TA value. The third time information of the terminal is time information when the terminal receives the third message. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced.

In a possible implementation, the processor is configured to use, according to a difference between the first time information of the terminal and the first time information of the network device, second time information of the terminal, the network device The second time information calculates a clock difference between the terminal and the network device. Determining the difference between the first time information of the network device and the first time information of the terminal on the network device side, the hardware complexity of the terminal side can be reduced.

In a possible implementation manner, the processor is configured to use, according to the first time information of the terminal, first time information of the network device, second time information of the terminal, and second of the network device. The time information calculates a clock difference between the terminal and the network device. Determining the difference between the first time information of the network device and the first time information of the terminal on the terminal side can reduce hardware complexity on the network device side.

In a fourth aspect, an embodiment of the present application provides a network device, including a transmitter, a receiver, and a processor.

The receiver is configured to receive a first message, where the first message carries the first time information of the terminal, and the first time information of the terminal is time information when the terminal sends the first message.

The processor is configured to calculate a difference between the first time information of the terminal and the first time information of the network device, where the first time information of the network device is time information when the network device receives the first message .

The transmitter is configured to send a third message, where the third message carries the third time information of the network device, and the third time information of the network device is time information when the network device sends the third message. .

In a possible implementation, the transmitter is configured to send a second message, where the second message carries a difference between the first time information of the terminal and the first time information of the network device, The second time information of the network device, where the second time information of the network device is time information when the network device sends the second message. Determining the difference between the first time information of the network device and the first time information of the terminal on the network device side, the hardware complexity of the terminal side can be reduced.

In a possible implementation, the transmitter is configured to send a second message, where the second message carries first time information of the terminal, first time information of the network device, and Two time information. Determining the difference between the first time information of the network device and the first time information of the terminal on the terminal side can reduce hardware complexity on the network device side.

In a fifth aspect, an embodiment of the present application provides a terminal, including a transceiver module and a determining module.

The transceiver module sends a first message, where the first message carries the first time information of the terminal, and the first time information of the terminal is time information when the terminal sends the first message.

The transceiver module may further receive a second message, where the second message carries first time information of the network device, second time information of the network device, and first time information of the terminal, or The second message carries a difference between the first time information of the network device and the first time information of the terminal, and second time information of the network device. The first time information of the network device is time information when the network device receives the first message, and the second time information of the network device is time information when the network device sends the second message.

The transceiver module may further receive a third message, where the third message carries third time information of the network device. The third time information of the network device is time information when the network device sends the third message.

Determining, by the determining module, the difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, and the second time information of the terminal The difference in clock information of the network device. After determining the clock information difference, the determining module determines a transmission delay of the terminal and the network device according to the third time information of the terminal and the third time information of the network device, to determine a TA value. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced. Determining, by the terminal, the transmission delay according to the third time information of the terminal and the third time information of the network device, to determine a TA value, which may be saved from the TA adjustment signaling of the network device, and saves the letter. Make the cost.

In a sixth aspect, an embodiment of the present application provides a network device, including a transceiver module and a recording module.

The transceiver module is configured to receive a first message, where the first message carries the first time information of the terminal, and the first time information of the terminal is time information when the terminal sends the first message, where the recording module Recording the first time information of the terminal.

The transceiver module sends a second message, where the second message carries first time information of the network device, second time information of the network device, and first time information of the terminal. The first time information of the network device is time information when the network device receives the first message, and the second time information of the network device is time information when the network device sends the second message, the record The module records first time information of the network device and second time information of the network device.

The transceiver module sends a third message, where the third message carries a third message of the third time information of the network device, and the third time information of the network device is when the network device sends the third message. Time information, the recording module records third time information of the network device.

In a seventh aspect, the embodiment of the present application provides a network device, including a transceiver module and a determining module.

The transceiver module is configured to receive a first message, where the first message carries the first time information of the terminal, and the first time information of the terminal is time information when the terminal sends the first message.

The transceiver module sends a second message, where the second message carries a difference between the first time information of the network device and the first time information of the terminal, and second time information of the network device. The first time information of the network device is time information when the network device receives the first message, and the second time information of the network device is time information when the network device sends the second message.

The transceiver module is further configured to send a third message, where the third message carries the third time information of the network device, where the third time information of the network device is when the network device sends the third message. Time information.

The determining module is configured to determine a difference between the first time information of the network device and the first time information of the terminal.

In an eighth aspect, the embodiment of the present application provides a method for acquiring a timing advance, where a terminal sends a first message to a network device, where the first message carries first time information of the terminal. The terminal further receives a second message, where the second message carries the first time information of the network device, the second time information of the network device, the first time information of the terminal, and the network device First location information and second location information of the network device, the second message may further carry a difference between the first time information of the network device and the first time information of the terminal, the network device Second time information, first location information of the network device, and second location information of the network device. The first location information of the network device is location information when the network device receives the first message, and the second location information of the network device is location information when the network device sends the second message. The terminal is configured according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, and the first location of the network device. The information, the second location information of the network device, the location information of the terminal, and the ephemeris information of the network device, where the second time information of the terminal is when the terminal receives the second message Time information; the terminal may further be configured according to a difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, the second time information of the terminal, The first location information of the network device and the second location information of the network device acquire location information of the terminal and ephemeris information of the network device. Receiving, by the terminal, the terminal receives a third message, where the third message includes third time information of the network device. Determining, by the terminal, the transmission of the terminal and the network device according to the third time information of the network device, the third time information of the terminal, the location information of the terminal, and the ephemeris information of the network device. Delay to determine the TA value. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced. When calculating the TA value, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration, and the error of the TA value can be further reduced.

In a possible implementation manner, in a random access process, the terminal performs an interaction process with the network device as follows: the terminal sends a first message to the network device. The terminal receives a second message of the network device. After the interaction of the random access process, the terminal acquires location information of the terminal and ephemeris information of the network device. After acquiring the location information of the terminal and the ephemeris information of the network device, the terminal further performs, according to the third time information of the network device carried in the third message delivered by the network device, with the terminal. The third time information determines a transmission delay of the terminal and the network device to determine a TA value. The third time information of the network device is carried in the third message, which can save signaling overhead in obtaining the TA value.

In a possible implementation manner, in the contention-based random access procedure, the first message may be message 3; the second message may be a contention resolution message. Optionally, the first message and the second message may also be other messages of the contention based random access procedure, so as to avoid redefining the message.

The ninth aspect, the embodiment of the present application provides a method for acquiring a timing advance, the network device sends a second message to the terminal, where the second message carries the first time information of the network device, and the network device The second time information, the first time information of the terminal, the first location information of the network device, and the second location information of the network device; the second message may also carry the network device a difference between the time information and the first time information of the terminal, the second time information of the network device, the first location information of the network device, and the second location information of the network device. The first location information of the network device is location information when the network device receives the first message, and the second location information of the network device is location information when the network device sends the second message. The network device sends a third message carrying the third time information of the network device to the terminal. The third time information of the network device is used to determine a transmission delay and a TA value of the terminal and the network device. The terminal determines the transmission delay according to the third time information of the terminal and the third time information of the network device to determine a TA value. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced.

In a tenth aspect, the embodiment of the present application provides a terminal, including a transmitter, a receiver, and a processor.

The receiver is configured to receive a second message, where the second message carries first time information of the network device, second time information of the network device, first time information of the terminal, and the network device The first location information and the second location information of the network device; the second message may further carry a difference between the first time information of the network device and the first time information of the terminal, the network Second time information of the device, first location information of the network device, and second location information of the network device. The first location information of the network device is location information when the network device receives the first message, and the second location information of the network device is location information when the network device sends the second message; Receiving a third message, the third message carries third time information of the network device.

The processor is configured according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, and the first of the network device. Position information, second location information of the network device, acquiring location information of the terminal and ephemeris information of the network device; the processor may further be configured according to the first time information of the network device and the terminal The difference between the first time information, the second time information of the network device, the second time information of the terminal, the first location information of the network device, and the second location information of the network device, The location information of the terminal and the ephemeris information of the network device. After acquiring the location information of the terminal and the ephemeris information of the network device, the processor, according to the third time information of the network device, the third time information of the terminal, the location information of the terminal, and the location Determining the ephemeris information of the network device, determining a transmission delay of the terminal and the network device to determine a TA value. Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced. When calculating the TA value, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration, and the error of the TA value can be further reduced.

In an eleventh aspect, an embodiment of the present application provides a network device, including a transmitter, a receiver, and a processor.

The receiver is configured to receive a first message, where the first message carries first time information of the terminal.

The processor is configured to acquire first location information of the network device and second location information of the network device.

The transmitter is configured to send a third message, where the third message carries third time information of the network device. The transmitter is further configured to send a second message, where the second message carries first time information of the network device, second time information of the network device, first time information of the terminal, and the network device The first location information and the second location information of the network device, the second message may further carry a difference between the first time information of the network device and the first time information of the terminal, the network device Second time information, first location information of the network device, and second location information of the network device.

In a twelfth aspect, the embodiment of the present application provides a terminal, including a transceiver module and a determining module.

The transceiver module sends a first message, where the first message carries first time information of the terminal.

The transceiver module may further receive a second message, where the second message carries first time information of the network device, second time information of the network device, first time information of the terminal, and the network a message of the first location information of the device and the second location information of the network device; the second message may further carry a difference between the first time information of the network device and the first time information of the terminal, The second time information of the network device, the first location information of the network device, and the second location information of the network device. The first location information of the network device is location information when the network device receives the first message, and the second location information of the network device is location information when the network device sends the second message.

The transceiver module may further receive a third message, where the third message carries third time information of the network device.

The determining module is configured according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, and the first of the network device. The location information, the second location information of the network device, acquire location information of the terminal, and ephemeris information of the network device. The determining module may further be configured to: according to the difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, the second time information of the terminal, The first location information of the network device and the second location information of the network device acquire location information of the terminal and ephemeris information of the network device. After obtaining the location information of the terminal and the ephemeris information of the network device, the determining module is configured according to location information of the terminal, ephemeris information of the network device, third time information of the network device, and The third time information of the terminal determines the transmission delay to determine the TA value.

Obtaining the TA value on the terminal side can avoid the retransmission of the TA value from the network device side to the terminal side, and the error of the TA value is reduced. And when determining the TA value, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration, and the error of the TA value is further reduced. Determining, by the terminal, the transmission delay according to the third time information of the terminal and the third time information of the network device, to determine a TA value, which may be saved from the TA adjustment signaling of the network device, and saves the letter. Make the cost. The recording module records second time information of the terminal.

In a thirteenth aspect, the embodiment of the present application provides a network device, including a transceiver module and a determining module.

The transceiver module is configured to receive a first message, where the first message carries first time information of the terminal.

The transceiver module sends a second message, where the second message includes first time information of the network device, first time information of the terminal, second time information of the network device, and a location information, second location information of the network device; the second message may further include a difference between the first time information of the network device and the first time information of the terminal, and the number of the network device Two time information, first location information of the network device, and second location information of the network device. The first location information of the network device is location information when the network device receives the first message, and the second location information of the network device is location information when the network device sends the second message.

The transceiver module is further configured to send a third message, where the third message carries third time information of the network device.

The determining module is configured to acquire first location information of the network device and second location information of the network device.

In a fourteenth aspect, the embodiment of the present application provides a chip system, including: at least one processor, a memory, and an interface circuit of the chip system, wherein the memory, the transceiver, and the at least one processor are interconnected by a line, and at least one of the memories is stored The instructions are executed by the processor to perform the methods described in the first, eighth aspects or any of the alternative implementations of the first and eighth aspects.

In a fifteenth aspect, the embodiment of the present application provides a chip system, including: at least one processor, a memory, and an interface circuit of the chip system, wherein the memory, the transceiver, and the at least one processor are interconnected by a line, and at least one memory is stored The instructions are executed by the processor to perform the methods described in the second, ninth or second or ninth alternative implementations.

In a sixteenth aspect, the embodiment of the present application provides a computer readable storage medium, which is applicable to a terminal, where the computer readable storage medium stores instructions, and when the instruction is run on the computing device, the first and the eighth are executed. Aspects or methods described in any of the alternative implementations of the first and eighth aspects.

In a seventeenth aspect, the embodiment of the present application provides a computer readable storage medium, which is applicable to a network device, where the computer readable storage medium stores instructions, and when the instruction is run on the computing device, performs a second The method described in the nine aspects or any of the alternative implementations of the second and ninth aspects.

In an eighteenth aspect, the embodiment of the present application provides a communication system, where the communication system includes at least one network device mentioned in the foregoing fourth and eleventh aspects.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

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

Figure 2 depicts a schematic diagram of a contention based random access procedure;

Figure 3 depicts a schematic diagram of a non-contention based random access procedure;

4 is a schematic diagram of a synchronization signal block provided by an embodiment of the present application;

FIG. 5 is a flowchart of acquiring a timing advance amount according to an embodiment of the present application;

6 is a flowchart of an acquisition time advancement amount in a contention-based random access procedure according to an embodiment of the present application;

FIG. 7 is a flowchart of acquiring a timing advance amount in a non-contention based random access procedure according to an embodiment of the present application;

FIG. 8 is a flowchart of still another acquisition time advancement amount in a contention-based random access procedure according to an embodiment of the present application; FIG.

9 is a flowchart of acquiring a timing advance in a satellite communication scenario according to an embodiment of the present application;

FIG. 10 is a flowchart of still another acquisition time advancement amount provided by an embodiment of the present application; FIG.

FIG. 11 is a flowchart of still another acquisition time advancement amount in a contention-based random access procedure according to an embodiment of the present application;

FIG. 12 is a flowchart of still obtaining a timing advance in a satellite communication scenario according to an embodiment of the present application; FIG.

FIG. 13 is a schematic diagram of a transmission delay in a communication link according to an embodiment of the present application; FIG.

FIG. 14 is a structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 15 is a structural diagram of a network device according to an embodiment of the present application;

FIG. 16 is a schematic block diagram of a terminal according to an embodiment of the present disclosure;

FIG. 17 is a schematic block diagram of a network device according to an embodiment of the present application;

FIG. 18 is a structural diagram of still another network device according to an embodiment of the present application;

19 is a schematic block diagram of still another terminal provided by an embodiment of the present application;

20 is a schematic block diagram of still another network device according to an embodiment of the present application;

FIG. 21 is a schematic block diagram of a chip system according to an embodiment of the present application.

Detailed ways

A method for acquiring a TA in a conventional LTE system is: the network device measures a transmission delay through a preamble sequence of a PRACH of the terminal to obtain a TA value. Then, the TA value is fed back to the terminal in the RAR message, and the terminal adjusts its uplink transmission time according to the TA value. In the communication system of the network element mobile, if the method for obtaining the TA value in the traditional LTE system is used, since the coverage of the network device in the communication system in which the network element moves is large, the network device needs to transmit another TA value after calculating the TA value. terminal. The round-trip transmission delay in the TA value acquisition process results in a large error in the measurement value of the TA. A large TA value error may cause the delay error of different terminals to reach the network device exceeds the length of one CP, resulting in the uplink signal transmitted by the terminal cannot be Correct decoding. In addition, due to the movement of the network element, the value of the TA changes rapidly. Therefore, the TA value needs to be adjusted frequently. The network device measures the TA through the uplink traffic channel and feeds back to the terminal, resulting in excessive signaling overhead.

In the communication system of the network element mobile, the moving speed of the network element is far greater than the moving speed of the network element in the traditional LTE system, and the coverage of the network equipment is far greater than the cell range in the traditional LTE system.

In the embodiment of the present application, the TA value measurement may be performed on the terminal side, and after the terminal obtains the TA value, the terminal may perform time synchronization according to the TA value, and overcome the traditional LTE acquisition method in the LTE mobile communication system. There is a disadvantage that the TA value measurement error is large and the signaling overhead is too large. Compared with the method for obtaining the TA value in the conventional LTE, in the method for measuring the TA value provided by the embodiment, the TA value is obtained on the terminal side, and the network device is not required to frequently measure the TA value and send the TA adjustment command, so the implementation The method of the example obtains the TA value, avoids the retransmission of the TA value from the network device to the terminal, and simplifies the acquisition process of the TA value.

The embodiment of the present application is applicable not only to the communication scenario in which the network element moves, but also to the communication scenario in which the network element is stationary. As shown in FIG. 1, at least one network device and at least one terminal (only one shown in the figure) are included in the wireless communication system, and the moving speed v _{1 of} the network device and the moving speed v _{2 of} the terminal may be Positive, or zero, the moving speed v _{1 of} the network device and the moving speed v ₂ direction of the terminal may be the same or opposite. The network device can be stationary or mobile. The terminal in communication with the network device may be stationary or may be mobile. When the network device is in a mobile state, for example, to achieve network coverage in a marine or desert area, the network device can be placed on a hot air balloon that is constantly moving to achieve large-area coverage of the network device. The mobile network device may also be a satellite in a satellite communication system in which OFDM is a modulation format. When the terminal moves, for example, in a normal 3G or 4G mobile communication scenario, a terminal such as a handheld device or a mobile station can move; in a communication scenario in which a terminal such as a civil aviation or a high-speed railway moves at a high speed, the moving speed of the terminal can be fast. The wireless communication system may be a satellite communication system in a modulation format of OFDM, or may be a 4G communication system (for example, an LTE system), a 5G communication system (for example, a new air interface system), and a communication system in which a plurality of communication technologies are integrated (for example, LTE). A communication system in which technology and new air interface technology are integrated) and a subsequent evolution system.

In the embodiment of the present application, the network device with the processing capability of the base station can be placed on the satellite side, that is, the embodiment can be applied to a scenario in which the satellite has on-board processing capability. This embodiment can also be applied to a bend forwarding scenario. A network device having a base station processing capability is placed on the ground, and the network device transmits a signal to the satellite, and then forwards the signal to the terminal through the satellite; the terminal can also send the signal to the satellite side. The satellite forwards the signal to a network device with base station processing capabilities on the ground. In an LTE network, the network device may be an eNode B. In the new air interface network, the network device may be a transmission reception point (TRP) or a generation node B (gNode B).

In the embodiment of the present application, the terminal may be a handheld device having a wireless communication function, an in-vehicle device, a wearable device, a computing device, or other processing device connected to the wireless modem. Terminals can be called different names in different networks, such as: user equipment, mobile stations, subscriber units, stations, cellular phones, personal digital assistants, wireless modems, wireless communication devices, handheld devices, laptops, cordless phones, Wireless local loop station, etc.

In the solution of the embodiment of the present application, in order to obtain the TA value, the terminal may first determine a clock difference between the terminal and the network device. The clock difference is also the difference between the clock information represented by the timer of the terminal and the clock information represented by the timer of the network device. The terminal may obtain the TA value according to the time information sent by the network device and the time information of the terminal, and considering the clock difference between the network device and the terminal.

The method for determining the clock difference between the network device and the terminal may be as follows: obtained by two interactions between the network device and the terminal. For example, the two interactions between the network device and the terminal are as follows: the first interaction: the terminal records the first time information of the terminal and sends the information to the network device, where the first time information of the terminal is Clock information represented by the timer of the terminal during the first interaction of the terminal. The network device records first time information of the network device when the first time information of the terminal is received, and the first time information of the network device is that the network device is in the first interaction process of the network device The clock information represented by the timer. a second interaction: the network device records the second time information of the network device, and sends the second time information to the terminal, where the second time information of the network device is the second time Clock information characterized by a timer of the network device during the interaction. The terminal records second time information when receiving the second time information of the network device. Determining a difference between the terminal and the clock information of the network device according to time information in the two interaction processes.

The terminal may determine a transmission delay according to a difference between the clock information of the network device and the network device to determine a TA value.

The random access procedure is divided into a contention based random access procedure and a non-contention based random access procedure. The contention-based random access procedure is as shown in FIG. 2, the terminal randomly selects a random access preamble, and sends a random access preamble message on the available resources of the random access preamble; after the network device successfully detects the random access preamble message of the terminal, And sending a random access response message, where the message includes at least: a random access preamble identifier, an uplink grant (UL grant), and the like; after receiving the random access response information, the terminal transmits the message on the resource specified by the uplink grant ( Message, Msg) 3, at least the message 3 should include a request message for the terminal to establish a radio resource control (RRC) connection; after receiving the message 3 sent by the terminal, the network device sends the terminal flag to the successfully accessed terminal. The competition resolves the message. The non-contention-based random access procedure is as shown in FIG. 3. First, the network device selects a random access preamble and sends the packet to the terminal through dedicated signaling. The terminal sends a random connection on the corresponding resource based on the preamble sequence allocated by the network device. The preamble message is sent; after the random access preamble message successfully detected by the network device, a random access response message is sent. When the value of the TA is determined in the random access process, the time information of the network device, the location information of the network device, the time information of the terminal, and the location information of the terminal may be carried in the interaction message between the terminal and the network device in the random access procedure. .

The first time information, the second time information, and the first time information and the second time information of the terminal may be carried in a specific message in the process of interaction between the terminal and the network device. For example, in the non-contention-based random access process, the difference between the first time information of the terminal and the first time information of the network device may be in the network device. Obtained on the side or terminal side.

And determining, according to the non-contention random access procedure, a clock information difference between the terminal and the network device. The specific manner is as follows: when the difference between the first time information of the terminal and the first time information of the network device is calculated on the network device side, the terminal carries the first time information of the terminal in random access. Sending to the network device in a preamble message; the network device side may obtain a difference between the first time information of the terminal and the first time information of the network device, The difference between the time information and the first time information of the network device, and the second time information of the network device are carried in the random access response message and sent to the terminal. When the difference between the first time information of the terminal and the first time information of the network device is calculated on the terminal side, the situation is different from the network device side calculation difference. The terminal sends the first time information of the terminal to the network device in the random access preamble message; the first time information of the terminal and the first time of the network device are not obtained by the network device side. a difference in the time information, so the network device carries the first time information of the terminal, the first time information of the network device, and the second time information of the network device in a random access response message to The terminal. The terminal records the second time information of the terminal, where the second time information of the terminal is time information when the terminal receives the random access message.

In the contention-based random access process, the clock information difference between the terminal and the network device is determined. The specific manner is as follows: in the contention-based random access process, the difference between the first time information of the terminal and the first time information of the network device may be in the network, as in the non-contention-based random access process. Obtained on the device side or terminal side. When the difference between the first time information of the terminal and the first time information of the network device is calculated on the network device side, the terminal may carry the first time information of the terminal in a random access preamble message. Sent to the network device, or the first time information of the terminal may be sent to the network device in the message 3, where the message 3 may be an Msg3 message in a random access procedure, where the Msg3 message may be included There is a unique identifier for the terminal, which can be used for conflict resolution. Since the network device side can obtain a difference between the first time information of the terminal and the first time information of the network device, the network device uses the first time information of the terminal and the network device The difference between the time information and the second time information of the network device is sent to the terminal in a random access response message. Or the network device sends the difference between the first time information of the terminal and the first time information of the network device and the second time information of the network device in a contention resolution message to the terminal. The terminal records the second time information of the terminal, where the second time information of the terminal is time information when the terminal receives the contention resolution message.

In the contention-based random access process, the clock information difference between the terminal and the network device is determined. The specific manner may be: when the difference between the first time information of the terminal and the first time information of the network device is calculated on the terminal side, the terminal may carry the first time information of the terminal in a random manner. The access preamble message is sent to the network device, or the first time information of the terminal may be carried in the message 3 and sent to the network device. The situation is different from the network device side calculation difference. The network device side does not obtain the difference between the first time information of the terminal and the first time information of the network device, so the network device uses the terminal. The first time information, the first time information of the network device, and the second time information of the network device are sent to the terminal in a random access response message. Or the network device sends the first time information of the terminal, the first time information of the network device, and the second time information of the network device in a contention resolution message to the terminal. The terminal records the second time information of the terminal, where the second time information of the terminal is time information when the terminal receives the contention resolution message.

On the basis of the interaction between the network device and the terminal, the difference between the clock information of the network device and the terminal may be obtained according to the time information of the network element in the interaction process. The terminal compares the third time information delivered by the network device with the third time information of the terminal, and the difference obtained is subtracted from the difference between the clock information of the network device and the terminal, The transmission delay of the terminal and the network device can be obtained. The TA value can be determined based on the transmission delay, which can be twice the transmission delay.

4 is a schematic diagram of a synchronization signal block (SS Block) provided by an embodiment of the present application. The SS block includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). Optionally, the SS block may further include a clock information. The domain resource block, wherein the clock center frequency domain resource block has a center frequency aligned with a frequency domain resource block of the PSS, a frequency domain resource block of the SSS, and a center frequency of the frequency domain resource block of the PBCH.

The terminal may obtain the clock information of the network device by using the PBCH in the SS Block sent by the network device, or obtain the network according to the frequency domain resource block of the clock information in the SS Block sent by the network device. Clock information of the device. After the terminal obtains the clock information of the network device, determining the network according to the difference between the clock information of the terminal and the network device, and the clock information of the terminal when acquiring the clock information of the network device. The transmission delay of the device and the terminal finally determines the TA value of the terminal. The TA value is calculated on the terminal side to prevent the network device in the traditional LTE system from calculating the TA value and then sending the value to the terminal, which reduces the transmission delay and reduces the measurement error of the TA value. On the other hand, after obtaining the clock difference between the terminal and the network device, the network device sends time information, and the terminal receives the time information sent by the network device and according to the time information of the terminal. The terminal can obtain a TA value, which saves signaling overhead.

In the solution of the embodiment of the present application, the terminal may acquire the location information of the terminal and the ephemeris information of the network device, where the ephemeris information of the network device includes at least the motion track of the network device. The terminal determines the TA value according to the time information delivered by the network device and the time information of the terminal.

The ephemeris information of the network device and the location information of the terminal are obtained, as follows: by two interactions between the network device and the terminal. For example, the two interactions between the network device and the terminal are as follows: a first interaction: the terminal sends a first message carrying the first time information of the terminal to the network device. The network device records first time information of the network device and first location information of the network device when the first message is received. a second interaction: the network device records second time information of the network device and second location information of the network device, and sends a second message to the terminal, where the second message carries the First time information of the network device, second time information of the network device, first time information of the terminal, first location information of the network device, and second location information of the network device, where The second message may further carry a difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, the first location information of the network device, and the Second location information of the network device. The terminal records second time information of the terminal when the terminal receives the second message. The terminal acquires ephemeris information of the network device and location information of the terminal according to time information and location information in two interaction processes. Optionally, the ephemeris information of the network device may also be obtained by using a broadcast message, where the broadcast message may be a master information block (MIB), a system information (SI), and a remaining system message (maining) System information, RMSI), etc. After the terminal obtains the ephemeris information of the network device and the location information of the terminal, the network device sends time information, and the terminal records its own time information.

The terminal may determine the transmission delay to determine the TA value according to the ephemeris information of the network device and the location information of the terminal, and according to the time information sent by the network device and the time information of the terminal.

In the random access process as shown in FIG. 2 and FIG. 3, when acquiring the ephemeris information of the network device and the location information of the terminal, the time information of the terminal, the location information of the terminal, and the location The location information of the network device and the time information of the network device may be carried in an interaction message between the terminal and the network device in the random access process.

The first time information of the terminal may be carried in the random access preamble message in the non-contention random access process. The first time information of the network device, the second time information of the network device, the first time information of the terminal, the first location information of the network device, and the second location information of the network device may be carried In the random access response message, or the difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, and the first location information of the network device And the second location information of the network device may be carried in a random access response message.

In the contention-based random access process, the first time information of the terminal may be carried in a random access preamble message. The first time information of the network device, the second time information of the network device, the first time information of the terminal, the first location information of the network device, and the second location information of the network device may be carried In the random access response message, or the difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, and the first location information of the network device And the second location information of the network device may be carried in a random access response message. Optionally, the first time information of the terminal may be carried in the message 3. The first time information of the network device, the second time information of the network device, the first time information of the terminal, the first location information of the network device, and the second location information of the network device may be carried In the contention resolution message, or the difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, the first location information of the network device, and the The second location information of the network device may be carried in a contention resolution message.

On the basis of the interaction between the network device and the terminal, the ephemeris information of the network device and the location information of the terminal may be obtained according to time information and location information of the network element in the interaction process. Optionally, the ephemeris information of the network device may also be obtained by using a broadcast message. The terminal further determines a transmission delay according to the third time information of the network device and the third time information of the terminal. The TA value can be determined according to the transmission delay, and the TA value can be twice the transmission delay.

Obtaining, by the terminal, the clock information of the network device by using the PBCH in the SS Block sent by the network device, or obtaining, by the terminal, the network device according to the clock information frequency domain resource block in the SS Block sent by the network device Clock information. After the terminal obtains the clock information of the network device, determining, according to the location information of the terminal, the ephemeris information of the network device, and the clock information of the terminal when acquiring the clock information of the network device, The transmission delay of the network device and the terminal finally determines the TA value of the terminal. The TA value is calculated on the terminal side to prevent the network device in the traditional LTE system from calculating the TA value and then sending the value to the terminal, reducing the transmission delay, and reducing the measurement error of the TA value, because in the process of acquiring the TA value. Considering the location information of the terminal, the location information of the network device, and the ephemeris information of the network device, the error of the TA value can be further reduced. On the other hand, after obtaining the clock difference between the terminal and the network device, the network device sends time information, and the terminal receives the time information sent by the network device and according to the time information of the terminal. The terminal can obtain a TA value, which saves signaling overhead.

As shown in FIG. 5, the embodiment of the present application provides a method for obtaining a TA value, which may include:

According to the steps of 502-510, the clock information difference between the terminal and the network device may be determined.

502: The terminal sends a first message carrying the first time information of the terminal to the network device.

The first time information of the terminal is time information when the terminal sends the first message, where the first time information may be time information represented by a clock source configured by the terminal.

The time information may be clock information represented by a pseudo-random sequence, and the pseudo-random sequence may change over time, and may represent clock information of the network device or the terminal, and the time information may also be clock information represented in digital form. In one embodiment of the present application, the first time information may be represented by a sequence of bits placed on subcarriers in an OFDM symbol.

In the contention-based random access procedure, the first message may be a random access preamble message or an Msg3 message; in the non-contention based random access procedure, the first message may be a random access preamble message.

504: The network device records first time information of the network device when the first message is received.

The first time information of the network device is time information when the network device receives the first message. For example, the network device receives at time t ₁ to the first message, the network device records t ₁ of the first time information of the network device.

506: The network device records second time information of the network device.

The second time information of the network device is time information when the network device sends the second message. After receiving the first message, the network device responds to the first message, and sends a second message to the terminal, where the second device of the network device is sent when the network device sends the second message to the terminal. Time information. For example, the network device sends the second message at time t ₂ , and the network device records t ₂ as second time information of the network device.

In the contention based random access procedure, the second message may be a RAR message or a contention resolution message; in the non-contention based random access procedure, the second message may be a RAR message.

508: The network device sends a second message to the terminal.

When the difference between the first time information of the network device and the first time information of the terminal is determined on the network device side, the network device shall carry the first time information of the terminal and the network device The second message of the difference of the first time information and the second time information of the network device is sent to the terminal.

When the difference between the first time information of the network device and the first time information of the terminal is determined on the terminal side, the network device will carry the first time information of the terminal, and the network device The first time information and the second message of the second time information of the network device are sent to the terminal.

510: The terminal records second time information when the terminal receives the second message of the network device.

For example, time information of the second terminal t ₃ to t ₃ of the terminal receiving the second message, the terminal records at a time. Determining, by the difference between the first time information of the terminal and the first time information of the network device, the difference between the second time information of the network device and the second time information of the terminal, the terminal The difference from the clock information of the network device. The second time information of the terminal is time information when the terminal receives the second message. The difference between the first time information of the terminal and the first time information of the network device and the difference between the second time information of the network device and the second time information of the terminal include the terminal and the The difference between the clock information of the network device. In the case of link symmetry, the uplink and downlink transmission delays can be offset, and the difference between the terminal clock information and the network device clock information can be obtained.

512: The terminal receives a third message that is sent by the network device and carries the third time information of the network device, and determines the terminal according to the third time information of the terminal when receiving the third message. The transmission delay of the network device further determines the TA value.

The third time information of the network device is used to calculate the time delay of the network device and the terminal, and the time information sent by the network device; the third time information of the terminal is used to calculate the network device and The time delay of the transmission of the terminal, and the time information sent by the network device.

It should be understood that, in the method for acquiring the timing advance of the terminal and the network device in the embodiment of the present application, the size of each process sequence number does not mean the sequence of execution, and the execution order of each process should be performed by its function. And the internal logic determines, and should not constitute any limitation on the implementation process of the embodiments of the present application.

FIG. 6 is a schematic diagram of a method for acquiring a timing advance according to an embodiment of the present application. In the method, in the contention-based random access process, the difference between the first time information of the terminal and the first time information of the network device is calculated on the network device side. The method can include:

In the contention-based random access procedure, according to the steps of 602-612, the clock information difference between the terminal and the network device may be determined.

602: In the interaction process of establishing a random access based on the contention, the terminal sends the random access preamble message carrying the first time information to the network device.

In the process of establishing a random access based on the contention, the terminal sends a random access preamble through the PRACH channel to initiate random access, and the first time information of the terminal may be carried in the random access preamble message. The first time information may be time information represented by a clock source configured by the terminal.

604: In a process of random access based on contention-based random access, the network device records first time information of the network device when the random access preamble message is received.

In an embodiment of the present application, in a process of establishing a random access based on contention, a random access preamble message is used to initiate random access, and the network device receives a random access preamble message of the terminal. Recording the first time information of the network device. The difference between the first time information of the network device and the first time information of the terminal includes a difference between clock information of the terminal and the network device.

606: The network device determines a difference between the first time information of the network device and the first time information of the terminal.

After the time information interaction process of the steps 602-606, the network device obtains the first time information of the terminal and the first time information and the second time information of the terminal. In an embodiment of the present application, in order to obtain an uplink transmission delay, the network device calculates a difference between the first time information of the network device and the first time information of the terminal. The time information stored by the network device at this time includes: a difference between the first time information of the network device and the first time information of the terminal, and second time information of the network device.

608: The network device records second time information of the network device.

In the interaction process of establishing a random access based on contention, the network device records second time information of the network device when the RAR message is sent.

610: The network device sends a RAR message to the terminal in a contention-based interaction process of establishing random access.

The network device may pass the first time information of the terminal with the first time information of the network device and the second time information of the network device in a process of establishing a random access based on the contention. A RAR message is sent to the terminal.

612: The terminal records second time information of the terminal when receiving the RAR message, and determines a difference between the terminal clock information and the network device clock information.

The time information on the terminal side includes the second time information of the terminal, the second time information of the network device, and the first time information of the network device delivered by the network device, and the first time of the terminal. The difference in time information. The terminal calculates a difference between the second time information of the network device and the second time information of the terminal.

Optionally, in the contention-based random access process, the first time information of the terminal may be carried in the Msg3 message; the first time information of the terminal is different from the first time information of the network device, The second time information of the network device may be carried in a contention resolution message.

In order to obtain the TA value of the terminal, it is necessary to first determine a difference between the terminal and the clock information of the network device. The difference between the first time information of the network device and the first time information of the terminal, the difference between the second time information of the network device and the second time information of the terminal, the terminal and the The clock information difference, transmission delay, device processing delay, and other time error factors of the network device. The following describes the processing method for the transmission delay, the device processing delay, and other time error factors in an embodiment of the present application, and finally gives the first time information difference between the terminal and the network device. And a method for obtaining a difference between the terminal and the network device second information to obtain a difference between the terminal and the network device clock information.

In an embodiment of the present application, the first time information of the terminal may be recorded as T _A1 , the first time information of the network device may be recorded as T _B1 , and the second time information of the network device may be recorded as T _B2 , the second time information of the terminal may be recorded as T _A2 , and the difference between the first time information of the network device and the first time information of the terminal is TIC(A)

TIC(A)=T _B1 -T _A1 (1)

The difference TIC(B) expression of the second time information T _{A2 of} the network device and the second time information T _B2 of the terminal is

TIC(B)=T _A2 -T _B2 (2)

Optionally, as shown in FIG. 7, the TIC (A) and the TIC (B) include other time errors such as a difference between the clock information of the terminal and the network device, an actual transmission delay, and a device processing delay. The error of the clock information of the terminal with respect to the standard time is denoted by Δt _A , and the error of the clock information of the network device with respect to the standard time is denoted by Δt _B . The standard time can be, for example, the atomic time determined by the atomic clock. The actual uplink and downlink transmission delays are denoted by τ _AB and τ _BA , and the receiving and transmitting device processing delays of the network device are recorded as τ _BR and τ _BT , and the receiving and transmitting device processing delays of the terminal are recorded as τ _AR , τ _AT , r _A , and r _B are other additional transmission delays (such as waveguide conduction delay) for uplink and downlink transmission, respectively. δ _A and δ _B are the time errors of the relativistic effects in the uplink and downlink transmission, respectively. The expressions of TIC(A) and TIC(B) can be obtained as

TIC(A)=Δt _A -Δt _B +τ _BA +τ _BT +τ _AR +r _A +δ _B (3)

TIC(B)=Δt _B -Δt _A +τ _AB +τ _AT +τ _BR +r _B +δ _A (4)

(3) in combination with (4), an expression of a difference between the terminal and the clock information of the network device can be obtained.

In an embodiment of the present application, the device processing delay can be calibrated; in the case where the uplink and downlink transmission links are symmetric, the uplink and downlink transmission delays and additional delays can be offset; the relativistic effects at small scales can be ignored; The difference between the clock information of the terminal and the network device can be easily obtained by the above formula.

It is to be understood that the transmission delays and other time error factors included in the TIC (A) and the TIC (B) are not limited to the foregoing embodiments, and the present embodiment does not affect the terminal and the network device. There are no restrictions on the way in which various transmission delays and time errors are handled during the transmission of the line.

614: The terminal receives a third message that is sent by the network device and carries the third time information of the network device, and determines a transmission delay according to the third time information of the terminal when receiving the third message. Determine the TA value.

In an embodiment of the present application, the third message sent by the network device may include an SS Block, where the SS Block includes a PBCH. The terminal may obtain the third time information of the network device according to the system frame number carried by the PBCH in the SS Block and the subframe number or the slot number in which the PBCH is located. Optionally, the SS block may include a clock information frequency domain resource block, and the terminal may further acquire clock information of the network device by using a clock information frequency domain resource block in the SS block.

The third time information of the network device may be carried in a physical resource block (PRB). The terminal obtains the third time information of the network device according to the system frame number carried by the PBCH in the SS Block and the subframe number or the slot number in which the PBCH is located. The terminal obtains a TA value according to time information when the terminal receives the SS Block. Compared with the method for obtaining the TA value in the traditional LTE, the network device measures the transmission delay to obtain the TA value and sends the value to the terminal. The method for obtaining the TA value in the embodiment of the present application saves the signaling overhead. It can be understood that the length of the two consecutive transmission intervals of the third time information of the network device and the length of the time information in the SS block may be different according to different wireless communication systems, which is not used by the embodiment of the present application. Make a limit.

The third time information of the network device in the third message is recorded as T _Bd , and the third time information that the terminal receives the third message of the network device is recorded as T _Ad , and the terminal and the network device can be obtained. Transmission delay is

τ=T _Ad -T _Bd -(Δt _A -Δt _B ) (6)

The terminal may determine the TA value according to the transmission delay, and the TA value is twice the transmission delay, and the expression of the TA is

TA=2τ=2T _Ad -2T _Bd -2(Δt _A -Δt _B ) (7)

According to this, the uplink signal transmission time is adjusted to achieve uplink synchronization. There are other ways in which the value of the TA can be determined.

In the foregoing embodiment, the time information is obtained by the interaction between the network device and the terminal, and the TA value is determined according to the difference of the time information on the terminal side. On the one hand, since the TA value is used locally after the terminal side is obtained, compared with the manner of obtaining the TA value in the legacy LTE system, the network device avoids the round-trip transmission of the TA value and then sends the signal to the terminal, so the transmission delay is small. , the error of the TA measurement value is reduced.

In a conventional LTE system, a network device measures a transmission delay through a preamble sequence of a physical random access channel PRACH of a terminal to obtain a TA value. Then, the TA value is fed back to the terminal in the random access response RAR message, and the terminal adjusts its uplink transmission time according to the TA value. The network device periodically measures the TA value from the uplink traffic channel and then gives the TA adjustment command in the downstream control channel. In the embodiment of the present application, the terminal may determine a clock difference between the terminal and the network device according to the third time information sent by the network device and the third time information of the terminal, to obtain the The terminal TA value saves signaling overhead.

FIG. 7 is a schematic diagram of a method for acquiring a timing advance according to an embodiment of the present application. In the method, in the non-contention based random access procedure, the difference between the first time information of the terminal and the network device is calculated on the network device side. The method can include:

In the non-contention based random access procedure, according to the steps of 702-712, the clock information difference between the terminal and the network device may be determined.

702: The terminal sends a random access preamble message carrying the first time information to the network device.

In the non-contention based random access procedure, the terminal sends a random access preamble through the PRACH to initiate random access. The first time information of the terminal may be carried in a random access preamble message.

704: The network device records first time information of the network device when the random access preamble message is received.

The random access preamble message is used to request to establish a random access, and the network device records the first time information of the network device when receiving the random access preamble message of the terminal. The difference between the first time information of the network device and the first time information of the terminal includes a difference between clock information of the terminal and the network device.

706: The network device determines a difference between the first time information of the network device and the first time information of the terminal.

708: The network device records second time information of the network device.

After receiving the random access preamble message, the network device sends a RAR message to the terminal. The network device records second time information of the network device when the RAR message is sent.

After the time information interaction process of the steps 702-708, the network device obtains the first time information of the terminal, the first time information of the network device, and the second time information of the network device. In an embodiment of the present application, the network device calculates a difference between the first time information of the network device and the first time information of the terminal. The time information on the network device side includes: a difference between the first time information of the network device and the first time information of the terminal, and second time information of the network device.

710: The network device sends, to the terminal, a RAR message that carries a difference between the first time information of the terminal and the first time information of the network device, and the second time information of the network device.

712: The terminal records second time information when the terminal receives the network device RAR message, and determines a difference between the second time information of the network device and the second time information of the terminal, to determine The difference between the terminal clock information and the network device clock information.

714: The terminal receives a third message that is sent by the network device and carries the third time information of the network device, and determines a TA value according to the third time information of the terminal when receiving the third message.

For a specific implementation of the TA value, reference may be made to the descriptions of

steps

612 and 614 in the embodiment shown in FIG. 6, and details are not described herein again.

In the embodiment of the present application, the terminal may obtain the third time information of the network device according to the system frame number carried in the PBCH in the SS Block and the subframe number or the slot number in which the PBCH is located. The terminal obtains a TA value according to time information when the terminal receives the SS Block. Compared with the method for obtaining the TA value in the traditional LTE, the network device needs to feed back the TA value to the terminal through the measurement sequence of the PRACH preamble sequence of the terminal, or the network device measures the TA value from the uplink traffic channel, and then downlinks. The TA adjustment command is sent in the control channel, and the method for obtaining the TA value in the embodiment of the present application saves signaling overhead. In the embodiment of the present application, since the TA value is obtained on the terminal side, the network device in the legacy LTE system is prevented from being sent to the terminal after the TA value is calculated, and the transmission delay is reduced, and the measurement error of the TA value can be reduced.

FIG. 8 is a schematic diagram of a method for acquiring a timing advance according to an embodiment of the present application. In the method, the difference between the first time information of the terminal and the first time information of the network device may be determined on the terminal side. The method can include:

In the contention-based random access procedure, according to the steps of 802-810, the clock information difference between the terminal and the network device may be determined.

802: The terminal sends a random access preamble message carrying the first time information to the network device in the interaction process of establishing a random access based on the contention.

804: The network device records first time information of the network device when receiving the random access preamble message in an interaction process of establishing a random access based on contention.

806: The network device records second time information of the network device.

808: In a contention-based interaction process of establishing random access, the network device may send a RAR message to the terminal.

For a specific implementation of the

steps

802, 804, 806, 808, reference may be made to the related description of the

steps

602, 604, 608, 610 in the embodiment shown in FIG. 6, and details are not described herein again.

In the embodiment of the present application, the RAR message of the network device includes the network device first, because the difference between the first time information of the network device and the first time information of the terminal is calculated on the terminal side. Time information, second time information of the network device, and first time information of the terminal.

810: In a process of establishing a random access based on the contention, the terminal receives a RAR message sent by the network device, and records a second time information when the terminal receives the RAR message of the network device, to determine The difference between the terminal clock information and the network device clock information.

Optionally, in the contention-based random access process, the first time information of the terminal may be carried in an Msg3 message; the first time information of the terminal, the first time information of the network device, the The second time information of the network device can be carried in the contention resolution message.

In the application embodiment, the terminal determines a difference between the first time information of the terminal and the first time information of the network device, second time information of the terminal, and second time information of the network device. The difference is determined to determine a difference between the terminal and the clock information of the network device. The first time information and the second time information of the terminal may be respectively recorded as T _A1 and T _A2 , and the first time information and the second time information of the network device may be respectively recorded as T _B1 and T _B2 . The terminal needs to calculate the terminal first, because the difference between the first time information and the second time information of the terminal and the network device includes a difference between the terminal clock information and the network device clock information. a first time information difference between the terminal and the network device, and a second information difference between the terminal and the network device,

TIC(A)=T _B1 -T _A1 (8)

TIC(B)=T _B2 -T _A2 (9)

According to the description algorithm in step 612 of the embodiment shown in FIG. 6, the difference between the terminal and the clock information of the network device is obtained.

812: The terminal receives a third message that is sent by the network device and carries the third time information of the network device, and determines a TA value.

The terminal receives a third message that is sent by the network device and carries the third time information of the network device, and determines the terminal according to the third time information of the terminal when the terminal receives the third message. The transmission delay of the network device is used to determine the value of the TA. For specific implementation, refer to the related description in step 614, and details are not described herein again.

In the embodiment of the present application, the calculation of the difference between the first time information of the terminal and the first time information of the network device is performed on the terminal side. The calculation process of the time information includes the calculation of the difference between the first time information of the terminal and the first time information of the network device, the calculation of the difference between the second time information and the second time information of the network device, and the terminal and The calculation of the difference of the network device clock information, the transmission delay, and the calculation of the TA value are all performed on the terminal side. The terminal completes all the calculation processes separately, and the network device may not configure a module that determines the difference between the first time information of the terminal and the first time information of the network device, so the structural complexity of the network device may be simplified.

FIG. 9 is a schematic diagram of a method for acquiring a TA value in a satellite communication system according to an embodiment of the present application. In the satellite communication system, a network element involved has a terminal, a network device installed on a satellite, or is relayed by a satellite. The satellite ground station of its signal. In the satellite communication system, the process of acquiring the TA value exhibits different characteristics from the terrestrial mobile communication system: 1. Since the signal coverage of the satellite is much larger than that of the terrestrial cell, the absolute distance between the satellite and the ground terminal is much larger than that of the terrestrial mobile communication system. The distance between the network device and the terminal, and the difference between the latest terminal and the farthest distance of the different terminals and the satellite is also much larger than the maximum distance difference in the LTE terrestrial cellular communication cell, so the value of the TA value is large; In the satellite communication system, the satellite moves rapidly relative to the terminal, and the distance between the satellite and the terminal changes faster than the distance between the network device and the terminal in the terrestrial mobile communication system. These two characteristics have led to the need for special attention in the acquisition of TA values in the satellite communication system.

In the satellite communication system, the method for acquiring the TA value by using the orthogonal frequency division multiplexing modulation method may include:

According to the steps of 902-910, the clock information difference between the terminal and the satellite can be determined.

902: The terminal sends a first message carrying the first time information of the terminal to the satellite.

904: The satellite records first time information of the satellite when the first message is received.

In the satellite communication system, the coverage of the satellite is large, and the distance between the satellite and the terminal is fast. For example, in a satellite communication system with a coverage radius of 422 km and a coverage area of 560,000 square kilometers (orbital height of 780 km), during the satellite movement, when the satellite elevation angle changes from 90 degrees to 58.2 degrees, The distance between the terminal and the satellite changes from 780 km to 899 km, and the range of variation exceeds 100 km. In the conventional terrestrial mobile communication system, the information bit length indicating the TA value is insufficient to indicate the transmission delay in the satellite communication system. In the embodiment of the present application, by recording the first time information of the terminal, the first time information of the satellite, the transmission delay in the process of transmitting and receiving the first message may use the first time information of the terminal and the The difference in the first time information of the satellite is represented.

906: The satellite records second time information of the satellite.

After receiving the first message, the satellite responds to the first message, and sends a second message to the terminal to record second time information when the satellite sends the second message to the terminal.

For a specific implementation of the

steps

902, 904, 906, reference may be made to the related descriptions of the

steps

502, 504, and 506 in the embodiment of FIG. 5 and the

steps

602, 604, and 606 in the embodiment shown in FIG. 6, and details are not described herein again.

908: The satellite sends a second message to the terminal.

The satellite transmits a first time information carrying the first time information of the terminal, the first time information of the satellite, and the second time information of the satellite to the terminal, or the satellite will bear A second message indicating a difference between the first time information of the terminal and the first time information of the satellite and the second time information of the satellite is sent to the terminal.

910: The terminal records second time information when the terminal receives the second message of the satellite, and according to the first time information of the terminal, the first time information of the satellite, and the second time of the satellite. The difference between the information and the second time information of the terminal determines a difference between the terminal clock information and the satellite clock information.

In the satellite communication system, a difference between the second time information of the satellite and the second time information of the terminal may indicate a transmission delay.

912: The terminal receives a third message that is sent by the satellite and carries the third time information of the satellite, and determines a TA value according to the third time information of the terminal when receiving the third message.

Assuming that the rate of change of the delay is 25us/s at the fastest and the length of the short CP is 4.6875us, when the terminal obtains the TA value, when the update period of the TA value is less than 93.75ms, the error of the TA is less than 4.6875us. Therefore, the method for obtaining the TA value in the embodiment of the application can make the error of the TA measurement value within a CP length, thereby ensuring that the uplink signal of the terminal can be correctly decoded.

For the method for determining the clock information difference and the TA value of the satellite and the terminal, reference may be made to the related description in the steps of the foregoing

embodiments

612 and 614, and details are not described herein again.

In the satellite communication scenario, the TA value is determined on the terminal side, which avoids the round-trip transmission of the satellite acquiring the TA value and then transmitting to the terminal, so the transmission delay is small, and the error of the TA measurement value is reduced.

The terminal acquires clock information of the satellite through a PBCH in an SS Block sent by the satellite. Optionally, the terminal may obtain clock information of the satellite by using a clock information frequency domain resource block in the SS Block sent by the satellite. The sending period of the SS block of the satellite may be 5 ms, and the terminal continuously adjusts the uplink timing in a period of 5 ms, which can improve the precision of the timing synchronization. The terminal can continuously adjust the terminal TA value according to the time information continuously sent by the satellite and the time information of the terminal, thereby saving signaling overhead.

In the solution of the embodiment of the present application, in order to obtain the TA value, the terminal may first determine the location information of the terminal and the ephemeris information of the network device, and obtain the location information of the terminal and the ephemeris information of the network device. The terminal finally determines the transmission delay and the timing advance according to the time information delivered by the network device, the time information of the terminal, and the ephemeris information of the satellite, and the ephemeris information of the network device includes at least the motion track of the network device. It should be pointed out that for the scene of the elbow forwarding, that is, the scene where the signal is forwarded by the satellite, the ground station is stationary, and the ephemeris information of the moving satellite is obtained in this scenario.

Determining the location information of the terminal and the ephemeris information of the network device may be as follows: obtained by two interactions between the network device and the terminal. For example, the two interactions between the network device and the terminal are as follows: a first interaction: the terminal records the first time information of the terminal and carries the first message of the first time information of the terminal. Sending to the network device, the first time information of the terminal is clock information represented by a timer of the terminal when the terminal sends the first message. The network device records first time information of the network device and first location information of the network device when the first message is received. a second interaction: the network device records the second time information of the network device and the second location information of the network device, and carries the first time information of the network device, the network device Transmitting, to the terminal, a second message of the location information, the second time information of the network device, and the second location information of the network device, where the second time information and the second location information of the network device are The clock information of the network device and the location information of the network device when the network device sends the second message, where the terminal records the second time information of the terminal when the terminal receives the second message. The terminal acquires location information of the terminal and ephemeris information of the network device according to an interaction process between the time information and the location information. Optionally, the ephemeris information of the network device may also be obtained by using a broadcast message.

The first time information of the network device, the second time information of the network device, the first location information of the network device, the second location information of the network device, and the first time information of the terminal, The second time information of the terminal may be carried in a specific message during the interaction between the terminal and the network device.

The location information of the terminal and the ephemeris information of the network device are determined according to a non-contention random access procedure. The specific mode is as follows: the terminal sends the first time information of the terminal to the network device in a random access preamble message; the network device uses the first time information of the terminal, and the network device The first time information, the first location information of the network device, the second time information of the network device, and the second location information of the network device are sent to the terminal in a random access response message.

In the contention-based random access process, the location information of the terminal and the ephemeris information of the network device are determined. The specific mode is as follows: the terminal sends the first time information of the terminal to the network device in a random access preamble message or message (message, Msg) 3; the network device will be the first of the terminal The time information, the first time information of the network device, the first location information of the network device, the second time information of the network device, and the second location information of the network device are carried in a random access response message or The contention resolution message is sent to the terminal.

After obtaining the location information of the terminal and the ephemeris information of the network device, the terminal receives a third message sent by the network device, where the third message carries the third time information of the network device, Or the third message further carries third location information of the network device. The terminal may determine a transmission delay according to the third time information of the terminal and the third time information of the network device, to determine a TA value, where the third time information of the network device sends the The time information of the third message, the third time information of the terminal is time information when the terminal receives the third message. The terminal acquires clock information of the network device by using a PBCH in the SS Block sent by the network device. Optionally, the terminal may obtain clock information of the network device by using a clock information frequency domain resource block in the SS Block sent by the network device. After the terminal obtains the clock information of the network device, determining, according to the location information of the terminal, the ephemeris information of the network device, and the clock information of the terminal when acquiring the clock information of the network device, The transmission delay of the network device and the terminal finally determines the TA value of the terminal. The TA value is calculated on the terminal side to prevent the network device in the traditional LTE system from calculating the TA value and then sending the value to the terminal, which reduces the transmission delay and reduces the measurement error of the TA value. And when determining the TA value, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration, and the error of the TA value is further reduced. On the other hand, after obtaining the location information of the terminal and the ephemeris information of the network device, the network device sends time information, and the terminal receives the time information sent by the network device and according to the terminal. The time information, the terminal can obtain the TA value, which saves signaling overhead.

As shown in FIG. 10, the embodiment of the present application provides a method for obtaining a TA value, which may include:

According to the steps of 1002-1010, location information of the terminal and ephemeris information of the network device may be acquired.

1002: The terminal sends a first message carrying the first time information of the terminal to the network device.

The first time information of the terminal is time information when the terminal sends the first message, and the first time information of the terminal is recorded.

For details of the step 1002, reference may be made to step 502 shown in FIG. 5, and details are not described herein again.

1004: The network device records first time information of the network device and first location information of the network device when the first message is received.

The first time information of the network device is time information when the network device receives the first message, and the first location information of the network device is location information when the network device receives the first message. For example, the network device at a time t ₁ of the first message is received, the network device records the time t ₁ of the first network device information of the network device at the time t ₁ is the position information The first location information of the network device.

1006: The network device records second time information of the network device and second location information of the network device.

The second time information of the network device is time information when the network device sends the second message, and the second location information of the network device is location information when the network device sends the second message. After receiving the first message, the network device responds to the first message, and sends a second message to the terminal, where the second device of the network device is sent when the network device sends the second message to the terminal. Time information and second location information of the network device. For example, the network device sends the second message at time t ₂ , the network device records t ₂ as second time information of the network device, and the location information of the network device at time t ₂ is the network. The second location information of the device.

1008: The network device sends a second message to the terminal.

The second message carries first time information of the network device, second time information of the network device, first time information of the terminal, first location information of the network device, and the network device Second location information. Optionally, the second message may further carry a difference between the first time information of the network device and the first time information of the terminal, the second time information of the network device, and the network device. First location information and second location information of the network device.

1010: The terminal acquires location information of the terminal and ephemeris information of the network device.

The terminal records second time information when the terminal receives the second message of the network device, where the terminal is based on the first time information of the terminal, the second time information of the terminal, and the number of the network device a time information, first location information of the network device, second time information of the network device, second location information of the network device, location information of the terminal, and ephemeris information of the network device, The ephemeris information of the network device includes at least a movement trajectory of the network device. Optionally, the terminal according to the difference between the first time information of the terminal and the first time information of the network device, the second time information of the terminal, the first location information of the network device, The second time information of the network device and the second location information of the network device acquire location information of the terminal and ephemeris information of the network device. Optionally, the ephemeris information of the network device may also be obtained by using a broadcast message. The terminal stores location information of the terminal and ephemeris information of the network device.

1012: The terminal receives a third message that is sent by the network device and carries the third time information of the network device, and according to the third time information of the terminal when receiving the third message, and the terminal The location information, the ephemeris information of the network device, determine a transmission delay of the terminal and the network device, and further determine a TA value.

The third time information of the network device is used to calculate the time delay of the network device and the terminal, and the network device sends the time information of the third message; the third time information of the terminal is calculated. The transmission time delay between the network device and the terminal, and the time information when the terminal receives the third message. After the terminal acquires the location information of the terminal and the ephemeris information of the network device, the terminal according to the location information of the terminal, the ephemeris information of the network device, the third time information of the terminal, The third time information of the network device determines a transmission delay, thereby determining a timing advance.

The terminal determines a delay in transmission, and may determine location information of the network device when the signal arrives at the network device, based on location information of the terminal, location information of the network device, and ephemeris information of the network device. The terminal determines a transmission delay according to location information of the terminal and location information of the network device when the signal arrives at the network device, and further determines a timing advance.

FIG. 11 is a schematic diagram of a method for acquiring a timing advance according to an embodiment of the present application. In the method, in the contention-based random access process, the method may include:

In the contention-based random access process, according to the steps of 1102-1110, the location information of the terminal and the ephemeris information of the network device may be acquired.

1102: In a process of establishing a random access based on the contention, the terminal sends a random access preamble message carrying the first time information of the terminal to the network device.

For details of the step 1102, reference may be made to the step 602 shown in FIG. 6, and details are not described herein again.

1104: In a process of contention-based random access, the network device records first time information of the network device and first location information of the network device when the random access preamble message is received.

In an embodiment of the present application, in a process of establishing a random access based on contention, a random access preamble message is used to initiate random access, and the network device receives a random access preamble message of the terminal. Recording first time information of the network device and first location information of the network device.

1106: The network device records second time information of the network device and second location information of the network device.

The network device records second time information of the network device and second location information of the network device when the network device sends a RAR message.

1108: The network device sends a RAR message to the terminal.

The RAR message includes first time information of the terminal, first time information of the network device, first location information of the network device, second time information of the network device, and a second location of the network device information. Optionally, the RAR message includes a difference between the first time information of the terminal and the first time information of the network device, first location information of the network device, second time information of the network device, The second location information of the network device.

In the contention based random access procedure, the first time information of the terminal may be carried in the Msg3 message. The first time information of the terminal, the first time information of the network device, the first location information of the network device, the second time information of the network device, and the second location information of the network device may be carried In the competition resolution message. Optionally, a difference between the first time information of the terminal and the first time information of the network device, first location information of the network device, second time information of the network device, the network device The second location information can be carried in the contention resolution message.

1110: The terminal acquires location information of the terminal and ephemeris information of the network device.

The terminal records the second time information of the terminal when the terminal receives the RAR message or the contention resolution message, and the terminal according to the first time information of the terminal, the second time information of the terminal, the network First time information of the device, first location information of the network device, second time information of the network device, second location information of the network device, location information of the terminal, and a star of the network device Calendar information. Optionally, the terminal according to the difference between the first time information of the terminal and the first time information of the network device, the second time information of the terminal, the first location information of the network device, The second time information of the network device and the second location information of the network device acquire location information of the terminal and ephemeris information of the network device. Optionally, the ephemeris information of the network device may also be obtained by using a broadcast message. The terminal stores location information of the terminal and ephemeris information of the network device.

The terminal receives the third message sent by the network device, where the terminal is based on the third time information of the terminal, the third time information of the network device, the location information of the terminal, and the network device. Ephemeris information to determine transmission delay and timing advance.

The third time information of the network device may be carried in the PRB. The terminal may obtain the third time information of the network device according to the system frame number carried by the PBCH in the SS Block and the subframe number or the slot number in which the PBCH is located. The terminal obtains a TA value according to time information when the terminal receives the SS Block. Compared with the method for obtaining the TA value in the traditional LTE, the network device measures the transmission delay to obtain the TA value and sends the value to the terminal. The method for obtaining the TA value in the embodiment of the present application saves the signaling overhead. It can be understood that the length of the two consecutive transmission intervals of the third time information of the network device and the length of the time information in the SS block may be different according to different wireless communication systems, which is not used by the embodiment of the present application. Make a limit.

In an embodiment of the present application, the terminal may determine the transmission delay according to the location information of the terminal, the ephemeris information of the network device, and the location information of the network device when the signal arrives at the network device, thereby determining the time. Advance quantity.

In the foregoing embodiment, the location information of the terminal and the ephemeris information of the network device are obtained by the interaction between the network device and the terminal, and the TA value is determined on the terminal side. On the one hand, since the TA value is used locally after the terminal side is obtained, compared with the manner of obtaining the TA value in the legacy LTE system, the network device avoids the round-trip transmission of the TA value and then sends the signal to the terminal, so the transmission delay is small. The error of the TA measurement value is reduced; on the other hand, in the process of acquiring the TA value, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration Further reduces the error of the TA value.

In a conventional LTE system, a network device measures a transmission delay through a preamble sequence of a terminal's PRACH to obtain a TA value. Then, the TA value is fed back to the terminal in the random access response RAR message, and the terminal adjusts its uplink transmission time according to the TA value. The network device periodically measures the TA value from the uplink traffic channel and then gives the TA adjustment command in the downstream control channel. In the embodiment of the present application, after the difference between the clock information of the network device and the terminal is obtained, the terminal may be configured according to the third time information sent by the network device and the third time information of the terminal. The clock difference between the terminal and the network device is determined to obtain the terminal TA value, which saves signaling overhead.

The method of acquiring the timing advance shown in FIG. 11 is also applicable to a non-contention based random access procedure. The method can include:

In the non-contention based random access process, according to the steps of 1102-1110, the location information of the terminal and the ephemeris information of the network device may be acquired.

1102: The terminal sends a random access preamble message carrying the first time information of the terminal to the network device.

1104: The network device records first time information of the network device and first location information of the network device.

1108: The network device sends a RAR message to the terminal.

1110: The terminal records second time information of the terminal when the terminal receives the RAR message, and the terminal acquires and stores the location information of the terminal and the ephemeris information of the network device.

After the terminal obtains the location information of the terminal and the ephemeris information of the network device, the terminal receives a third message of the network device, where the terminal according to the location information of the terminal, the ephemeris of the network device The information, the third time information of the terminal, and the third time information of the network device determine a timing advance.

In a satellite communication system employing an orthogonal frequency division multiplexing modulation method, a method of acquiring a TA value requires special attention. The method for obtaining the TA value is as shown in FIG. 12, and may include:

According to the steps of 1202-1210, the location information of the terminal and the ephemeris information of the satellite may be acquired.

1202: The terminal sends a first message carrying the first time information of the terminal to the satellite.

1204: The satellite records first time information of the satellite and first position information of the satellite when receiving the first message.

1206: The satellite records second time information of the satellite and second position information of the satellite.

After receiving the first message, the satellite responds to the first message, and sends a second message to the terminal, recording second time information of the satellite when the satellite sends the second message to the terminal. And second location information of the satellite.

For a specific implementation of the

steps

1202, 1204, and 1206, reference may be made to the related descriptions of the

steps

1002, 1004, and 1006 in the embodiment of FIG. 10 and the

steps

1102, 1104, and 1106 in the embodiment shown in FIG. 11, and details are not described herein again.

1208: The satellite sends a second message to the terminal.

The second message includes first time information of the terminal, first time information of the satellite, first location information of the satellite, second time information of the satellite, and second location information of the satellite . Optionally, the second message includes a difference between the first time information of the terminal and the first time information of the satellite, first location information of the satellite, second time information of the satellite, The second position information of the satellite. The terminal records second time information of the terminal when the terminal receives the second message.

1210: The terminal according to the first time information of the terminal, the second time information of the terminal, the first time information of the satellite, the first location information of the satellite, and the second time information of the satellite The second location information of the satellite acquires location information of the terminal and ephemeris information of the satellite.

Optionally, the terminal according to the difference between the first time information of the terminal and the first time information of the satellite, the second time information of the terminal, the first location information of the satellite, and the satellite The second time information, the second location information of the satellite acquires location information of the terminal and ephemeris information of the satellite. The terminal stores location information of the terminal and ephemeris information of the satellite.

For the method of obtaining the location information of the terminal and the ephemeris information of the satellite, reference may be made to the related description in the steps of the foregoing

embodiments

1010 and 1110, and details are not described herein again.

1212: The terminal receives a third message that is sent by the satellite and carries third time information of the satellite, and according to the third time information of the terminal when receiving the third message, the third of the satellite The time information, the location information of the terminal, and the ephemeris information of the satellite determine a transmission delay, thereby determining a timing advance.

For the method for determining the clock information difference and the TA value of the satellite and the terminal, reference may be made to the related description in the

steps

1012 and 1112 in the foregoing embodiments, and details are not described herein again.

In the satellite communication scenario, the TA value is determined on the terminal side, which avoids the round-trip transmission of the satellite acquiring the TA value and then transmitting to the terminal, so the transmission delay is small, and the error of the TA measurement value is reduced, since the TA is acquired. In the process of value, the location information of the terminal, the location information of the network device, and the ephemeris information of the satellite are also taken into consideration, so that the error of the TA value is further reduced.

FIG. 14 shows a device diagram of the terminal in the embodiment of the present application, including a transmitter 1402, a receiver 1403, and a processor 1405.

a transmitter 1402, configured to send a first message carrying the first time information of the terminal to the network device;

The first time information of the terminal is the time information when the terminal sends the first message. Optionally, the terminal may include a timer 1401, where the recorder 1401 is configured to record the first time information of the terminal. In the contention-based random access procedure, the transmitter 1402 is configured to send a random access preamble message or an Msg3 message carrying the first time information of the terminal to the network device; in the non-contention based random access In the process, the transmitter 1402 is configured to send a random access preamble message carrying the first time information of the terminal to the network device.

The receiver 1403 is configured to receive, by the network device, the bearer that is sent by the network device, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device. The first time information of the first time information and the second time information of the network device, the second time information of the second time information of the network device, the first time information of the network device is that the network device receives the first message Time information.

The receiver 1403 is configured to receive, by the network device, a host that carries the terminal, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the terminal side. a time information, a first time information of the network device, a second message of the second time information of the network device, and a second time information of the network device is time information when the network device sends the second message .

In a contention-based random access procedure, a receiver 1403 is configured to receive a RAR message or a contention resolution message of the network device; in a non-contention based random access procedure, a receiver 1403 is configured to receive the network device. RAR message.

The receiver 1403 may be further configured to receive a third message that carries the third time information of the network device, where the third time information of the network device is time information when the network device sends the third message.

All or part of the timer 1401, the transmitter 1402, and the receiver 1403 may be implemented on one or more integrated circuits (ICs), radio frequency ICs, mixed signal ICs, and the like.

Optionally, the terminal may include a memory 1404, where the memory 1404 is configured to store a clock information difference between the network device and the terminal required to determine a TA value, and a transmission delay of the terminal and the network device.

The difference between the first time information of the terminal and the first time information of the network device is obtained by the network device side, and the memory 1404 is configured to store the second time information of the terminal and the network device. The difference between the two time information.

The memory 1404 is configured to store the first time information of the terminal and the network device in a scenario that the difference between the first time information of the terminal and the first time information of the network device is obtained on the terminal side. a difference between a time information, a second time information of the terminal, and a second time information of the network device, where the second time information of the terminal is time information when the terminal receives the second message The timer 1401 records the second time information of the terminal.

Determining, according to the first time information of the terminal, the first time information of the network device, the second time information of the terminal, and the second time information of the network device, the terminal and the network device After the clock difference, the clock difference between the terminal and the network device is stored.

The processor 1405 is configured to further determine, according to the time information, a clock difference, a transmission delay, and a TA value of the terminal and the network device.

The processor 1405 is configured to calculate the second time information of the terminal and the network device, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device side. The difference in the second time information.

The processor 1405 is further configured to use, according to the first time information of the terminal, the network, in a scenario that the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device. The difference between the first time information of the device, the difference between the second time information of the terminal, and the second time information of the network device calculates a clock difference between the terminal and the network device.

The processor 1405 is further configured to use the third time information that is sent by the network device, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device. The third time information of the terminal, the clock difference between the terminal and the network device, obtains a transmission delay of the terminal and the network device, and determines a TA value by a transmission delay.

The processor 1405 is configured to calculate second time information of the terminal and the network device, where the difference between the first time information of the terminal and the first time information of the network device is obtained on the terminal side. a difference between the second time information, a difference between the first time information of the terminal, and the first time information of the network device.

The processor 1405 is further configured to use, according to the first time information of the terminal, the network device, in a scenario that the difference between the first time information of the terminal and the first time information of the network device is obtained by the terminal side. The difference between the first time information, the second time information of the terminal, and the second time information of the network device calculates a clock difference between the terminal and the network device.

The processor 1405 is further configured to use, according to the third time information that is sent by the network device, in a scenario that the difference between the first time information of the terminal and the first time information of the network device is obtained by the terminal device. The third time information of the terminal, the clock difference between the terminal and the network device, the transmission delay of the terminal and the network device, the TA value determined by the transmission delay, and the third time of the network device The information is time information when the third message is sent by the network device, where the third message includes third time information of the network device, and the third time information of the terminal is when the terminal receives the third message. Time information. Optionally, the terminal may include a timer 1401, and the timer 1401 records third time information of the terminal.

Alternatively, the terminal can include a memory 1404 that can store program code and data for use by the processor 1405. The processor 1405 can be implemented on one or more application specific integrated circuits (ASICs) and/or other ICs.

In the contention-based random access procedure, the first message may be a random access preamble message or an Msg3 message, and the second message may be a RAR message or a contention resolution message; in the non-contention based random access procedure, the first message It may be a random access preamble message, and the second message may be a RAR message.

In the device implementation manner of the terminal, the first time information of the terminal, the record of the second time information, the difference between the first time information of the terminal and the first time information of the network device, and the terminal The calculation and storage of the difference between the second time information and the second time information of the network device, the acquisition of the clock difference between the terminal and the network device, and the detailed description of the acquisition of the TA value may refer to the method embodiment steps. , will not repeat them here.

FIG. 15 is a device diagram of a network device in an embodiment of the present application, including a receiver 1502, a processor 1503, and a transmitter 1505.

The receiver 1502 is configured to receive a first message carrying the first time information of the terminal.

The first time information of the terminal is time information when the terminal sends the first message. In the contention-based random access procedure, the receiver 1502 is configured to receive a random access preamble message or an Msg3 message carrying the first time information of the terminal; in the non-contention based random access procedure, the receiver 1502 And a random access preamble message for receiving first time information carrying the terminal.

The processor 1503 is configured to calculate the first time information of the terminal and the network in a scenario obtained by the network device side in a scenario where the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device The difference between the first time information of the device, the first time information of the network device is time information when the network device receives the first message, optionally, the network device may include a timer 1501, the timer 1501 Recording the first time information of the network device.

Optionally, the network device may include a memory 1504, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device side, and is used for storing Determining the difference between the first time information of the terminal and the first time information of the network device.

The transmitter 1505 is configured to send a message of the network device that includes time information to the terminal.

The transmitter 1505 may be configured to send a third message that carries the third time information of the network device, where the third time information of the network device is time information when the network device sends the third message, optionally, The network device may include a timer 1501 that records third time information of the network device.

The transmitter 1505 is configured to send the first time information and the host that carries the terminal, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the network device side. The second time information of the network device, the second time information of the second time information of the network device, and the second time information of the network device is time information when the network device sends the second message, where Optionally, the network device may include a timer 1501, and the timer 1501 records second time information of the network device.

The transmitter 1505 is configured to send the first time information that carries the terminal, where the difference between the first time information of the terminal and the first time information of the network device is obtained by the terminal side. a first time information of the network device, and a second message of the second time information of the network device.

In the contention based random access procedure, the transmitter 1505 is configured to send a RAR message or a contention resolution message to the terminal; in the non-contention based random access procedure, the transmitter 1505 is configured to send the RAR message to the Said terminal.

The timer, receiver, processor, memory, and transmitter in the terminal can be implemented on an IC, an analog IC, a radio frequency IC, a mixed signal IC, an ASIC, a printed circuit board, an electronic device, or the like. The timer, receiver, processor, memory, and transmitter in the terminal can also be fabricated by various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor ( N metal oxide semiconductor (NMOS), P metal oxide semiconductor (PMOS), bipolar junction transistor (BJT), bipolar CMOS, silicon germanium (SiGe), gallium arsenide ( GaAs) and the like.

In the implementation of the physical device of the network device, the first time information of the network device, the record of the second time information, the difference between the first time information of the terminal and the first time information of the network device For a detailed description of the calculation, reference may be made to the method embodiment steps, and details are not described herein again.

FIG. 16 shows a schematic block diagram of a terminal 1600 in accordance with an embodiment of the present application. As shown in FIG. 16, the terminal may include a transceiver module 1602 and a determination module 1606.

The transceiver module 1602 is configured to send and receive an interaction message between the terminal and the network device, and the determining module 1606 is configured to determine a difference, a transmission delay, and a TA value of the clock information of the terminal and the network device, optionally, the The terminal includes a recording module 1604 for recording time information of the terminal.

The transceiver module 1602 sends a first message to the network device, where the first message carries the first time information of the terminal. Optionally, the terminal includes a recording module 1604, and the recording module 1604 records the terminal. The first time information, the first time information of the terminal is time information when the terminal sends the first message. The transceiver module 1602 receives the second message of the network device, where the second message carries the first time information of the terminal and the first time information difference of the network device, and the second time information of the network device, The first time information of the network device is time information when the network device receives the first message, and the second time information of the network device is time information when the network device sends the second message. Optionally, the terminal includes a recording module 1604, and the recording module 1604 records second time information of the terminal, where the second time information of the terminal is time information when the terminal receives the second message.

The determining module 1606 determines the terminal and the location according to the difference between the first time information of the terminal and the first time information of the network device, the second time information of the terminal, and the second time information of the network device. The difference between the clock information of the network device.

The transceiver module 1602 receives the third message of the network device, where the third message carries the third time information of the network device. Optionally, the terminal includes a recording module 1604, and the recording module 1604 records the terminal. The third time information, the third time information of the terminal is time information when the terminal receives the third message. Determining, according to the third time information of the network device that is triggered by the network device, and the third time information of the terminal when receiving the third message, determining a transmission delay between the terminal and the network device And determining a TA value, where the third time information of the network device is time information when the network device sends the third message.

In the contention-based random access process, the transceiver module 1602 is configured to send a random access preamble message or an Msg3 message, and receive a RAR message or a contention resolution message. In the non-contention based random access process, the transceiver module 1602 is configured to send The random access preamble message receives the RAR message.

For example, the transceiver module 1602 is configured to support

steps

502, 512, 602, 614, 702, 714, 702, 712, 902, 912 in the flowchart for obtaining the timing advance.

The second time information of the terminal is time information when the terminal receives the second message. Optionally, the terminal includes a recording module 1604, and the recording module 1604 can be used to record second time information of the terminal. For example, the logging module 1604 is configured to support

steps

510, 612, 712, 810, 812, 910 in the flowchart for obtaining the timing advance.

For example, the determination module 1606 is configured to support

steps

510, 512, 602, 614, 702, 714, 802, 812, 902, 912 in the flowchart for obtaining the timing advance.

It should be understood that the terminal 1600 according to the embodiment of the present application may correspond to the terminal in the method for acquiring the timing advance of the terminal and the network device according to the embodiment of the present application, and each module and other in the terminal 1600 The operations and/or functions are respectively implemented in order to implement the corresponding processes of the methods in FIG. 5 to FIG. 9, and are not described herein for brevity.

Therefore, the terminal in the embodiment of the present application obtains time information by interacting with the network device, and the terminal determines the TA value according to the difference of the time information. On the one hand, since the terminal can be used locally after obtaining the TA value, the transmission delay is small, and the error of the TA measurement value is reduced, so that the uplink signal of the terminal can be correctly decoded. On the other hand, after the difference between the clock information of the network device and the terminal is obtained, the terminal may continuously and according to the third time information sent by the network device and the third time information of the terminal. Adjusting the terminal TA value saves signaling overhead.

FIG. 17 shows a schematic block diagram of a network device 1700 according to an embodiment of the present application. As shown in FIG. 17, the network device includes a transceiver module 1702 and a determining module 1706.

The transceiver module 1702 is configured to send and receive an interaction message with the terminal. Optionally, the network device may further include a recording module 1704, where the recording module 1704 is configured to record time information of the network device.

The transceiver module 1702 receives the first message, where the first message carries the first time information of the terminal, and the first time information of the terminal is the time information when the terminal sends the first message. Optionally, the network device may further include a recording module 1704, where the recording module 1704 records the first time information of the network device, where the first time information of the network device is the time when the network device receives the first message. information. The transceiver module 1702 sends a second message. Optionally, the network device may further include a recording module 1704. The recording module 1704 records second time information of the network device, where the second message carries the terminal. The time information of the first time information of the network device and the second time information of the network device, and the second time information of the network device is time information when the network device sends the second message. The determining module 1706 is configured to determine a difference between the first time information of the network device and the first time information of the terminal.

The transceiver module 1702 sends a third message. Optionally, the network device may further include a recording module 1704. The recording module 1704 records third time information of the network device, where the third message carries the network device. The third time information, the third time information of the network device is time information when the network device sends the third message.

For example, the transceiver module 1702 is configured to support

steps

508, 610, 710 in the flowchart for obtaining the timing advance.

For example, the logging module 1704 is configured to support

steps

504, 506, 604, 608, 704, 708 in the flowchart for obtaining the timing advance.

For example, the determination module 1706 is configured to support

steps

606, 706 in the flowchart for obtaining the timing advance.

It should be understood that the network device 1700 according to the embodiment of the present application may correspond to the network device in the method for acquiring the timing advance of the terminal and the network device according to the embodiment of the present application, and each module in the network device 1700 and Other operations and/or functions are respectively implemented in order to implement the corresponding processes of the methods in FIG. 5-7, and are not described herein again for brevity.

The network device 1700 shown in FIG. 17 may further include a transceiver module 1702 and a recording module 1704. The transceiver module 1702 is configured to send and receive an interaction message with the terminal, and the recording module 1704 is configured to record time information of the network device.

The transceiver module 1702 receives the first message, where the first message carries the first time information of the terminal, and the first time information of the terminal is the time information when the terminal sends the first message. The recording module 1704 records the first time information of the network device, where the first time information of the network device is time information when the network device receives the first message. The transceiver module 1702 sends a second message, and the recording module 1704 records the second time information of the network device, where the second message carries the first time information of the terminal, the first time information of the network device, and the The second time information of the network device, where the second time information of the network device is time information when the network device sends the second message.

The transceiver module 1702 sends a third message, and the recording module 1704 records the third time information of the network device, where the third message carries the third time information of the network device, and the third time information of the network device is The time information when the network device sends the third message.

For example, the transceiver module 1702 is configured to support step 808 in the flowchart of acquiring the timing advance as shown in FIG.

For example, the logging module 1704 is configured to support

steps

804, 806 in the flowchart of the acquisition timing advance as shown in FIG.

It should be understood that the network device 1700 according to the embodiment of the present application may correspond to the network device in the method for acquiring the timing advance of the terminal and the network device according to the embodiment of the present application, and each module in the network device 1700 and The other operations and/or functions are respectively implemented in order to implement the corresponding processes of the method in FIG. 8. For brevity, no further details are provided herein.

Therefore, the network device in the embodiment of the present application obtains time information by interacting with the terminal, and sends the time information to the terminal, so that the terminal determines the TA value according to the time information. On the one hand, since the TA value can be used locally at the terminal, the transmission delay is small, and the error of the TA measurement value is reduced, and the uplink signal of the terminal can be correctly decoded. On the other hand, after the difference between the clock information of the network device and the terminal is obtained, the network device sends time information to the terminal, and the terminal further adjusts the terminal TA value according to local time information. , saving signaling overhead.

The first time information of the terminal is the time information when the terminal sends the first message. Optionally, the terminal may include a timer 1401, where the timer 1401 is used to record the first time information of the terminal. In the contention-based random access procedure, the transmitter 1402 is configured to send a random access preamble message or an Msg3 message carrying the first time information of the terminal to the network device; in the non-contention based random access In the process, the transmitter 1402 is configured to send a random access preamble message carrying the first time information of the terminal to the network device.

The receiver 1403 is configured to receive, by the network device, first time information that carries the network device, second time information of the network device, first time information of the terminal, and a number of the network device. a second message of the location information and the second location information of the network device; or the receiver 1403 may further receive the first time information that is sent by the network device and that carries the network device, and the terminal a second message of a difference in time information, second time information of the network device, first location information of the network device, and second location information of the network device. The first time information of the network device is time information when the network device receives the first message, and the second time information of the network device is time information when the network device sends the second message, the network The first location information of the device is location information when the network device receives the first message, and the second location information of the network device is location information when the network device sends the second message.

The processor 1405 is configured according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, and the network device a location information, second location information of the network device, acquiring location information of the terminal and ephemeris information of the network device, or the processor 1405 is configured according to the first time information of the network device Obtaining a difference between the first time information of the terminal, the second time information of the network device, the second time information of the terminal, the first location information of the network device, and the second location information of the network device, The location information of the terminal and the ephemeris information of the network device, and the ephemeris information of the network device includes at least a movement trajectory of the network device. Optionally, the terminal may include a timer 1401, where the timer 1401 records second time information of the terminal; the processor 1405 may further be configured according to the first time information of the network device and the terminal Obtaining the difference between the first time information, the second time information of the network device, the second time information of the terminal, the first location information of the network device, and the second location information of the network device Location information of the terminal and ephemeris information of the network device.

Optionally, the terminal may include a memory 1404 for storing ephemeris information of the network device and location information of the terminal required to determine a TA value.

The processor 1405 is configured to further determine a TA value according to ephemeris information of the network device, location information of the terminal, third time information of the network device, and third time information of the terminal.

The processor 1405 determines a TA value according to the third time information of the network device delivered by the network device, the third time information of the terminal, the ephemeris information of the network device, and the location information of the terminal. The third time information of the terminal is time information when the terminal receives the third message. Optionally, the terminal may include a timer 1401, and the timer 1401 records third time information of the terminal.

All or part of the timer 1401, the transmitter 1402, and the receiver 1403 may be implemented on one or more analog ICs, radio frequency ICs, mixed signal ICs, and the like.

Alternatively, the terminal can include a memory 1404 that can store program code and data for use by the processor 1405. The processor 1405 can be implemented on one or more ASICs and/or other ICs.

In the device implementation manner of the terminal, the first time information of the terminal, the record of the second time information of the terminal, the location information of the terminal, the acquisition of the ephemeris information of the network device, and the TA value For a detailed description of the determination, reference may be made to the method embodiment steps, and details are not described herein again.

FIG. 18 shows a device diagram of a network device in an embodiment of the present application, including a receiver 1802, a processor 1803, and a transmitter 1804.

The receiver 1802 is configured to receive a first message that carries first time information of the terminal.

In the contention-based random access procedure, the receiver 1802 is configured to receive a random access preamble message or an Msg3 message carrying the first time information of the terminal; in the non-contention based random access procedure, the receiver 1802 And a random access preamble message for receiving first time information carrying the terminal.

The processor 1803 is configured to acquire first location information of the network device. Optionally, the network device may include a recorder 1801, and the recorder 1801 records first time information of the network device and first location information of the network device.

The transmitter 1804 sends a second message to the terminal, where the second message carries first time information of the network device, second time information of the network device, first time information of the terminal, and The first location information of the network device and the second location information of the network device; or the second message may further carry a difference between the first time information of the network device and the first time information of the terminal a value, second time information of the network device, first location information of the network device, and second location information of the network device.

The processor 1803 is configured to acquire second location information of the network device. Optionally, the network device may include a recorder 1801, and the recorder 1801 records second time information of the network device and second location information of the network device.

The transmitter 1804 may be configured to send a third message that carries the third time information of the network device, where the third time information of the network device is time information when the network device sends the third message, or the The three messages further include third location information of the network device. Optionally, the network device may include a recorder 1801, and the recorder 1801 records third time information of the network device.

In the contention based random access procedure, the transmitter 1804 is configured to send a RAR message or a contention resolution message to the terminal; in the non-contention based random access procedure, the transmitter 1804 is configured to send the RAR message to the location Said terminal.

The timers, receivers, and processor transmitters in the network device can be implemented on ICs, analog ICs, RF ICs, mixed-signal ICs, ASICs, printed circuit boards, electronic devices, and the like. The timers, receivers, processors, and transmitters in the network device can also be fabricated using various IC process technologies, such as CMOS, NMOS, PMOS, BJT, bipolar CMOS, SiGe, GaAs, and the like.

The physical device implementation of the network device, the first time information of the network device, the second time information of the network device, the first location information of the network device, and the second location of the network device The description of the location information and the detailed description of the record can be referred to the method embodiment steps, and details are not described herein again.

FIG. 19 shows a schematic block diagram of a terminal 1900 in accordance with an embodiment of the present application. As shown in FIG. 19, the terminal may include a transceiver module 1902 and a determination module 1906.

The transceiver module 1902 is configured to send and receive an interaction message between the terminal and the network device, and the determining module 1906 is configured to acquire location information of the terminal, ephemeris information, transmission delay, and TA value of the network device.

Optionally, the terminal includes a recording module 1904, and the recording module 1904 is configured to record time information of the terminal.

The transceiver module 1902 sends a first message to the network device, where the first message carries the first time information of the terminal. Optionally, the terminal includes a recording module 1904, and the recording module 1904 records the terminal. The first time information, the first time information of the terminal is time information when the terminal sends the first message. The transceiver module 1902 receives the second message of the network device, where the second message carries the first time information of the network device, the second time information of the network device, the first time information of the terminal, and the The first location information of the network device and the second location information of the network device; or the second message may further carry a difference between the first time information of the network device and the first time information of the terminal a value, second time information of the network device, first location information of the network device, and second location information of the network device. Optionally, the terminal includes a recording module 1904, and the recording module 1904 records second time information of the terminal, where the second time information of the terminal is time information when the terminal receives the second message.

The determining module 1906 is configured according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, and the first location of the network device. The information, the second location information of the network device, the location information of the terminal, and the ephemeris information of the network device; the determining module 1906 may further be configured according to the first time information of the network device and the terminal Obtaining the terminal, the difference of the time information, the second time information of the network device, the second time information of the terminal, the first location information of the network device, and the second location information of the network device Location information and ephemeris information of the network device. Optionally, the terminal includes a storage module 1908, where the storage module 1908 is configured to store location information of the terminal and ephemeris information of the network device.

The transceiver module 1902 receives the third message of the network device, where the third message carries the third time information of the network device. Optionally, the terminal includes a recording module 1904, and the recording module 1904 records the terminal. The third time information, the third time information of the terminal is time information when the terminal receives the third message. Determining, by the determining module, the transmission of the terminal and the network device according to the third time information of the network device, the third time information of the terminal, the location information of the terminal, and the ephemeris information of the network device Extend to determine the TA value.

In the contention-based random access process, the transceiver module 1902 is configured to send a random access preamble message or an Msg3 message, and receive a RAR message or a contention resolution message. In the non-contention based random access process, the transceiver module 1902 is configured to send The random access preamble message receives the RAR message.

For example, the transceiver module 1902 is configured to support

steps

1002, 1012, 1102, 1112, 1202, 1212 in the flowchart of acquiring the timing advance.

The second time information of the terminal is time information when the terminal receives the second message. Optionally, the terminal includes a recording module 1904, and the recording module 1904 can be used to record second time information of the terminal. For example, the logging module 1904 is configured to support

steps

1010, 1110, 1210 in the flowchart for obtaining the timing advance.

For example, the determination module 1906 is configured to support

steps

1010, 1012, 1110, 1112, 1210, 1212 in the flowchart for acquiring the timing advance.

It should be understood that the terminal 1900 according to the embodiment of the present application may correspond to the terminal in the method for acquiring the timing advance of the terminal and the network device according to the embodiment of the present application, and each module and other in the terminal 1900 The operations and/or functions are respectively implemented in order to implement the corresponding processes of the methods in FIG. 10 to FIG. 12, and are not described herein for brevity.

Therefore, the terminal in the embodiment of the present application obtains the location information of the terminal and the ephemeris information of the network device by using the interaction with the network device, and the terminal according to the third time information of the network device The third time information of the terminal, the location information of the terminal, and the ephemeris information of the network device, determine a transmission delay of the terminal and the network device, to determine a TA value. On the one hand, since the terminal can be used locally after obtaining the TA value, the transmission delay is small, the error of the TA measurement value is reduced, and the uplink signal of the terminal can be correctly decoded. On the other hand, the above embodiment In the process of determining the TA value, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration, further reducing the error of the TA value; the terminal is in the After the difference between the clock information of the network device and the terminal is obtained, the terminal TA value can be continuously adjusted according to the third time information sent by the network device and the third time information of the terminal, thereby saving signaling overhead. .

FIG. 20 shows a schematic block diagram of a network device 2000 according to an embodiment of the present application. As shown in FIG. 20, the network device includes a transceiver module 2002 and a determination module 2006.

The transceiver module 2002 is configured to send and receive an interaction message with the terminal, and the determining module 2006 is configured to determine location information of the network device. Optionally, the network device may further include a recording module 2004, where the recording module 2004 is configured to record the network. Time information of the device.

The transceiver module 2002 receives the first message, where the first message carries the first time information of the terminal, and the determining module 2006 acquires the first location information of the network device. Optionally, the network device may further include a recording module 2004, where the recording module 2004 records first time information of the network device and first location information of the network device, where the first time information of the network device is The time information when the network device receives the first message, where the first location information of the network device is location information when the network device receives the first message.

The transceiver module 2002 sends a second message, where the second message carries the first time information of the network device, the second time information of the network device, the first time information of the terminal, and the network device a location information and second location information of the network device; or the second message may further carry a difference between the first time information of the network device and the first time information of the terminal, the network Second time information of the device, first location information of the network device, and second location information of the network device. The determining module 2006 is configured to acquire second location information of the network device. Optionally, the network device may further include a recording module 2004, where the recording module 2004 records second time information of the network device and second location information of the network device, where the second time information of the network device is The time information when the network device sends the second message, where the second location information of the network device is the location information when the network device sends the second message.

The transceiver module 2002 sends a third message. Optionally, the network device may further include a recording module 2004. The recording module 2004 records third time information of the network device, where the third message carries the network device. The third time information, the third time information of the network device is time information when the network device sends the third message.

For example, the transceiver module 2002 is configured to support

steps

1008, 1108, 1208 in the flowchart for obtaining the timing advance.

For example, the logging module 2004 is used to support

steps

1004, 1006, 1104, 1106, 1204, 1206 in the flowchart for obtaining the timing advance.

For example, the determination module 2006 is used to support

steps

1010, 1012, 1110, 1112, 1210, 1212 in the flowchart for obtaining the timing advance.

It should be understood that the network device 2000 according to the embodiment of the present application may correspond to the network device in the method for acquiring the timing advance of the terminal and the network device according to the embodiment of the present application, and each module in the network device 2000 and Other operations and/or functions are respectively implemented in order to implement the corresponding processes of the methods in FIGS. 10-12, and are not described herein again for brevity.

Therefore, the network device in the embodiment of the present application obtains time information by interacting with the terminal, and sends the time information to the terminal, so that the terminal determines the TA value according to the time information. On the one hand, since the TA value can be used locally at the terminal, the transmission delay is small, and the error of the TA measurement value is reduced, and the uplink signal of the terminal can be correctly decoded. When the TA value is determined, the location information of the terminal, the location information of the network device, and the ephemeris information of the network device are also taken into consideration, and the error of the TA value is further reduced. On the other hand, after the difference between the clock information of the network device and the terminal is obtained, the network device sends time information to the terminal, and the terminal further adjusts the terminal TA value according to local time information. , saving signaling overhead.

FIG. 21 is a schematic structural diagram of a chip system 2100 according to an embodiment of the present application. The chip system 2100 includes at least one processor 2102, a memory 2104, an interface circuit 2106, and a bus system 2108. The memory 2104 can include read only memory and random access memory, and provides operational instructions and data to the processor 2102. A portion of the memory 2104 can also include a non-volatile random access memory.

In some implementations, the memory 2104 stores elements, executable modules or data structures, or a subset thereof, or their extended set.

In the embodiment of the present application, the corresponding operation is performed by calling an operation instruction stored in the memory 2104, which can be stored in the operating system.

One possible implementation manner is that the structure of the chip system used by the network device or the terminal is similar, but different devices use different chip systems to implement their respective functions.

The processor 2102 controls the operation of the network device or terminal, and the processor 2102 may also be referred to as a central processing unit (CPU). Memory 2104 can include read only memory and random access memory and provides instructions and data to processor 2102. A portion of the memory 2104 can also include a non-volatile random access memory. The bus system 2108 includes a data bus, a power bus, a control bus, a status signal bus, and the like.

The method disclosed in the foregoing embodiment of the present application may be applied to the processor 2102 or implemented by the processor 2102. The processor 2102 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 2102 or an instruction in a form of software. The processor 2102 described above may be a general purpose processor, a digital signal processor (DSP), an ASIC, an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 2104, and the processor 2102 reads the information in the memory 2104 and, in conjunction with its hardware, performs the steps of the above method.

Optionally, the interface circuit 2106 is configured to perform the steps of receiving and transmitting the network device or terminal in the embodiment shown in FIGS. 5-12.

The processor 2102 is configured to perform the steps of the processing of the network device or terminal in the embodiment shown in FIGS. 5-12.

The embodiment of the present application provides a computer readable storage medium, where the computer readable storage medium stores instructions, when the computer readable storage medium is run on the terminal, causing the terminal to perform the steps performed by the terminal in the foregoing embodiment (including 5 - 12, all steps performed by the terminal, such as 502, 510, 512, 602, 612, 614, 702, 712, 714, 802, 810, 812, 902, 910, 912, 1002, 1010, 1012 , 1102, 1110, 1112, 1202, 1210, 1212).

The embodiment of the present application provides a computer readable storage medium, where the computer readable storage medium stores instructions, when the computer readable storage medium runs on the network device, causing the network device to perform the execution by the network device in the foregoing embodiment. Steps (including all of the steps performed by the network device in Figures 5-12, such as 504, 506, 508, 604, 606, 608, 610, 504, 506, 508, 510, 804, 806, 808, 904, 906 , 908, 1004, 1006, 1008, 1104, 1106, 1108, 1204, 1206, 1208).

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be another division manner, for example, multiple modules or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or module, and may be in an electrical, mechanical or other form.

The modules described as separate components may or may not be physically separated. The components displayed as modules may or may not be physical modules, that is, may be located in one place, or may be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional module in each embodiment of the present application may be integrated into one module, or each module may exist separately, or two or more modules may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of hardware plus software function modules.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the device is installed. The internal structure is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the device described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.

The specific embodiments of the present invention have been described in detail with reference to the specific embodiments of the present application. It is to be understood that the foregoing description is only The scope of protection, any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application are included in the scope of protection of the present application.

Claims

A method for obtaining a timing advance (TA), comprising:

The terminal acquires location information of the terminal and ephemeris information of the network device, where ephemeris information of the network device includes at least a movement track of the network device;

Receiving, by the terminal, a message including time information of the network device;

Determining, by the terminal, the time information of the network device, the time information when the terminal receives the message including the time information of the network device, the location information of the terminal, and the ephemeris information of the network device, The amount of time ahead.
The method according to claim 1, wherein the terminal acquires location information of the terminal and ephemeris information of the network device, including:

The terminal sends a first message to the network device, where the first message includes first time information of the terminal, and the first time information of the terminal is when the terminal sends the first message Time information

Receiving, by the terminal, the second message of the network device, where the second message includes first time information of the network device, first time information of the terminal, second time information of the network device, The first location information of the network device, the second location information of the network device; or the second message includes a difference between the first time information of the network device and the first time information of the terminal, The second time information of the network device, the first location information of the network device, and the second location information of the network device, the first time information of the network device is that the network device receives the first message Time information of the time, the second time information of the network device is time information when the network device sends the second message, and the first location information of the network device is that the network device receives the first message Location information of the network device, where the second location information of the network device is location information when the network device sends the second message;

The terminal according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, and the first location of the network device The information, the second location information of the network device, the location information of the terminal, and the ephemeris information of the network device, where the second time information of the terminal is when the terminal receives the second message Time information.
The method according to claim 2, wherein the first message is a random access preamble message in a random access procedure, and the second message is a random access response in the random access procedure ( RAR) message.
The method according to claim 2, wherein the first message is a message (Msg) 3 in the random access procedure, and the second message is a contention resolution message in the random access procedure. .
The method according to any one of claims 1 to 4, wherein the terminal receives a message including time information of the network device; the terminal receives the location according to time information of the network device The time information of the message including the time information of the network device, the location information of the terminal, the ephemeris information of the network device, and the determined time advance amount include:

The terminal receives the third message sent by the network device, and records the third time information of the terminal, where the third time information of the terminal is time information when the terminal receives the third message, where The third time information of the network device is included in the third message, and the third time information of the network device is time information when the network device sends the third message;

The terminal determines the time advance amount according to the location information of the terminal, the ephemeris information of the network device, the third time information of the network device, and the third time information of the terminal.
The method according to claim 5, characterized in that the third time information of the network device is carried in a synchronization signal block (SS Block).
The method according to claim 5 or 6, wherein the third time information of the network device is obtained from a physical broadcast channel (PBCH) in the synchronization signal block.
The method according to claim 5 or 6, wherein the third time information of the network device is obtained from a clock information frequency domain resource block in the synchronization signal block.
A terminal, comprising:

a processor, configured to acquire location information of the terminal and ephemeris information of the network device, where ephemeris information of the network device includes at least a movement track of the network device;

a transmitter, configured to send a message including time information of the terminal;

a receiver, configured to receive a message including time information of the network device;

The processor is further configured to: according to time information of the network device, time information when the receiver receives the message including time information of the network device, location information of the terminal, and information about the network device Ephemeris information to determine the amount of time advancement.
The terminal according to claim 9, wherein

The transmitter is specifically configured to send the first message to the network device, where the first message includes first time information of the terminal, and the first time information of the terminal is when the terminal sends the first message Time information;

The receiver is specifically configured to receive a second message of the network device, where the second message includes first time information of the network device, first time information of the terminal, and second of the network device Time information, first location information of the network device, second location information of the network device; or the second message includes first time information of the network device and first time information of the terminal a difference, a second time information of the network device, first location information of the network device, second location information of the network device, and first time information of the network device is received by the network device The time information of the first message, the second time information of the network device is time information when the network device sends the second message, and the first location information of the network device is that the network device receives the first Location information of the network device, where the second location information of the network device is location information when the network device sends the second message;

The processor is specifically configured to: according to the first time information of the network device, the first time information of the terminal, the second time information of the network device, the second time information of the terminal, the network device The first location information, the second location information of the network device, the location information of the terminal, and the ephemeris information of the network device, where the second time information of the terminal is received by the terminal Time information at the time of the second message.
The terminal according to claim 10, wherein the first message is a random access preamble message in a random access procedure, and the second message is a random access response message in the random access procedure. .
The terminal according to claim 10, wherein the first message is message 3 in the random access procedure, and the second message is a contention resolution message in the random access procedure.
A terminal according to any one of claims 9 to 12, characterized in that

The receiver is specifically configured to receive a third message that is sent by the network device, where the third message includes third time information of the network device, and the third time information of the network device is the network Time information when the device sends the third message;

The processor is specifically configured to determine the time advance amount according to location information of the terminal, ephemeris information of the network device, third time information of the network device, and third time information of the terminal, where The third time information of the terminal is time information when the receiver receives the third message.
The terminal according to claim 13, wherein the third time information of the network device is carried in a synchronization signal block.
The terminal according to claim 13 or 14, wherein the third time information of the network device is acquired from a physical broadcast channel in the synchronization signal block.
The terminal according to claim 13 or 14, wherein the third time information of the network device is obtained from a clock information frequency domain resource block in the synchronization signal block.