CN115884346A

CN115884346A - Timing advance method, device and storage medium

Info

Publication number: CN115884346A
Application number: CN202111130321.XA
Authority: CN
Inventors: 汤文
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2023-03-31
Also published as: WO2023045759A1

Abstract

The embodiment of the application provides a timing advance method, a timing advance device and a storage medium, wherein the method comprises the following steps: sending a first uplink signal to network side equipment; receiving first timing adjustment information sent by the network side equipment; sending a second uplink signal to the network side equipment; receiving second timing adjustment information sent by the network side equipment; determining a rate of change of a Timing Advance (TA) adjustment value based on the first timing adjustment information and the second timing adjustment information; determining a TA adjustment value based on a rate of change of the TA adjustment value; and carrying out timing advance according to the TA adjusting value. The timing advance method, the timing advance device and the storage medium provided by the embodiment of the application determine the change rate of the TA adjustment value based on two uplink signals, determine the adjustment value of the subsequent uplink TA based on the change rate of the TA adjustment value, and improve the synchronization precision under the condition of inaccurate ephemeris information or high dynamic terminal.

Description

Timing advance method, device and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a timing advance method, apparatus, and storage medium.

Background

In a satellite communication system, a time synchronization technology is an important support and guarantee for the normal operation of the system.

At present, the technical discussion of time synchronization of a satellite communication system mainly focuses on initial time synchronization under the condition of accurate ephemeris information and low-dynamic terminals, and does not relate to time synchronization under the condition of inaccurate ephemeris information or high-dynamic terminals.

Therefore, how to perform time synchronization on the premise of inaccurate ephemeris information or high dynamic terminals is a technical problem to be solved urgently.

Disclosure of Invention

The embodiment of the application provides a timing advance method, a timing advance device and a storage medium, which are used for solving the technical problem that in the prior art, ephemeris information is inaccurate or no synchronization scheme exists under the condition of a high-dynamic terminal, and the synchronization precision under the condition of the ephemeris information is inaccurate or the high-dynamic terminal is improved.

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

sending a first uplink signal to network side equipment;

receiving first timing adjustment information sent by the network side equipment;

sending a second uplink signal to the network side equipment;

receiving second timing adjustment information sent by the network side equipment;

determining a rate of change of a Timing Advance (TA) adjustment value based on the first timing adjustment information and the second timing adjustment information;

determining a TA adjustment value based on a rate of change of the TA adjustment value;

and carrying out timing advance according to the TA adjusting value.

In some embodiments, determining a TA adjustment value based on a rate of change of the TA adjustment value comprises:

judging whether the change rate of the TA adjustment value is greater than a first threshold value or not;

determining a TA adjusting value according to the second timing adjusting information, the time for receiving the second timing adjusting information and the change rate of the TA adjusting value under the condition that the change rate of the TA adjusting value is greater than the first threshold value;

and determining a TA adjusting value according to the second timing adjusting information under the condition that the change rate of the TA adjusting value is smaller than or equal to the first threshold value, or determining the TA adjusting value according to the second timing adjusting information, the time for receiving the second timing adjusting information and the change rate of the TA adjusting value determined last time.

In some embodiments, the calculation formula for determining the TA adjustment value is as follows:

T ₂ ＝K(t ₂ -t ₁ )+T ₁

wherein, T ₂ Is t ₂ TA adjustment value at time, K is the rate of change of TA adjustment value, t ₁ For the time of receiving the second timing adjustment information, T ₁ And adjusting the TA value contained in the second timing adjustment information.

In some embodiments, further comprising:

receiving a first indication message sent by the network side equipment; the first indication message is used for indicating the terminal to send an uplink signal; the uplink signal includes the first uplink signal and the second uplink signal.

In some embodiments, further comprising:

receiving a second indication message sent by the network side equipment; the second indication message is used for indicating the terminal to send the uplink signal according to a target period.

In some embodiments, in an initial access process, the first uplink signal is a PRACH signal, and the second uplink signal is a PRACH signal or an uplink reference signal;

after the initial access, the uplink signal is a PRACH signal or an uplink reference signal.

In a second aspect, an embodiment of the present application provides a timing advance method, including:

receiving a first uplink signal sent by a terminal;

determining first timing adjustment information according to the first uplink signal, and sending the first timing adjustment information to the terminal;

receiving a second uplink signal sent by the terminal;

and determining second timing adjustment information according to the second uplink signal, and sending the second timing adjustment information to the terminal.

In some embodiments, in case that the TA adjustment value indicated by the second timing adjustment information is greater than a second threshold value, sending a first indication message to the terminal; the first indication message is used for indicating the terminal to send a third uplink signal.

In some embodiments, further comprising:

sending a second indication message to the terminal; the second indication message is used for indicating the terminal to send an uplink signal according to a target period; the uplink signal includes the first uplink signal and the second uplink signal.

In some embodiments, further comprising:

and sending a third indication message to the terminal, wherein the third indication message is used for indicating the terminal to update the target period.

In a third aspect, an embodiment of the present application provides a terminal, including a memory, a transceiver, and a processor;

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

sending a first uplink signal to network side equipment;

sending a second uplink signal to the network side equipment;

and carrying out timing advance according to the TA adjusting value.

T ₂ ＝K(t ₂ -t ₁ )+T ₁

In some embodiments, further comprising:

receiving a second indication message sent by the network side equipment; and the second indication message is used for indicating the terminal to send the uplink signal according to a target period.

In a fourth aspect, an embodiment of the present application provides a network-side device, including a memory, a transceiver, and a processor;

receiving a first uplink signal sent by a terminal;

receiving a second uplink signal sent by the terminal;

In some embodiments, further comprising:

In a fifth aspect, an embodiment of the present application provides a timing advance apparatus, including:

the first sending module is used for sending a first uplink signal to the network side equipment;

a first receiving module, configured to receive first timing adjustment information sent by the network side device;

a second sending module, configured to send a second uplink signal to the network side device;

a second receiving module, configured to receive second timing adjustment information sent by the network side device;

a first determining module, configured to determine a change rate of a timing advance TA adjustment value based on the first timing adjustment information and the second timing adjustment information;

a second determining module for determining a TA adjustment value based on a rate of change of the TA adjustment value;

and the timing advance module is used for carrying out timing advance according to the TA adjusting value.

In a sixth aspect, an embodiment of the present application provides a timing advance device, including:

the third receiving module is used for receiving the first uplink signal sent by the terminal;

a third determining module, configured to determine first timing adjustment information according to the first uplink signal, and send the first timing adjustment information to the terminal;

a fourth receiving module, configured to receive a second uplink signal sent by the terminal;

and a fourth determining module, configured to determine second timing adjustment information according to the second uplink signal, and send the second timing adjustment information to the terminal.

In a seventh aspect, this application embodiment further provides a processor-readable storage medium, which stores a computer program for causing a processor to execute the steps of the timing advance method according to the first aspect or the second aspect.

The timing advance method, the timing advance device and the storage medium provided by the embodiment of the application determine the change rate of the TA adjustment value based on two uplink signals, determine the adjustment value of the subsequent uplink TA based on the change rate of the TA adjustment value, and improve the synchronization precision under the condition of inaccurate ephemeris information or high dynamic terminal.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic flowchart of a timing advance method according to an embodiment of the present application;

FIG. 2 is a second flowchart illustrating a timing advance method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an initial access timing synchronization process provided in an embodiment of the present application;

fig. 4 is a second schematic diagram illustrating an initial access timing synchronization process according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a network side device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a timing advance device according to an embodiment of the present application;

fig. 8 is a second schematic structural diagram of a timing advance device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic flowchart of a timing advance method according to an embodiment of the present disclosure, and as shown in fig. 1, an execution main body of the timing advance method according to the embodiment of the present disclosure may be a terminal/User Equipment (UE), for example, a mobile phone. The method comprises the following steps:

step 101, a first uplink signal is sent to a network side device.

And the UE sends a first uplink signal to the network side equipment.

The network side equipment receives a first uplink signal sent by the UE.

In some embodiments, during the initial access procedure, the first uplink signal is a PRACH signal. After the initial access, the first uplink signal is a PRACH signal or an uplink reference signal.

The uplink Reference Signal may be a Sounding Reference Signal (SRS), a Demodulation Reference Signal (DMRS), and a Phase Tracking Reference Signal (PTRS).

And 102, receiving first timing adjustment information sent by the network side equipment.

Specifically, after receiving a first uplink signal sent by the UE, the network side device determines first timing adjustment information according to the first uplink signal, and sends the first timing adjustment information to the UE.

And the UE receives the first timing adjustment information sent by the network side equipment.

The first Timing adjustment information may include a Timing Advance (TA) adjustment value.

In the initial Access procedure, the first timing adjustment information may be carried by a Random Access Response (RAR).

After the initial Access, the first timing adjustment information may be carried by a Media Access Control Element (MAC CE).

For example, in the initial access process, the network side device uses the received PRACH preamble sequence to correlate with the local root sequence, detects the position of the correlation peak, and then detects the residual time offset, and the network side device converts the residual time offset into a bit number corresponding to a Timing Advance Command (TAC) and issues the bit number to the UE along with the RAR.

For another example, after the initial access, the network side device uses the received uplink reference signal to correlate with the local reference signal base sequence, detects the position of the correlation peak, and can detect the residual time offset, and the network side device converts the residual time offset into the number of bits corresponding to the TAC, and sends the number of bits to the UE by using the MAC CE.

And step 103, sending a second uplink signal to the network side equipment.

Specifically, after receiving the first timing adjustment information, the UE performs timing advance according to the first timing adjustment information, and sends a second uplink signal to the network side device.

In some embodiments, during the initial access procedure, the second uplink signal is a PRACH signal or an uplink reference signal. After the initial access, the second uplink signal is a PRACH signal or an uplink reference signal.

And step 104, receiving second timing adjustment information sent by the network side equipment.

Specifically, after receiving a second uplink signal sent by the UE, the network side device determines second timing adjustment information according to the second uplink signal, and sends the second timing adjustment information to the UE.

And the UE receives the second timing adjustment information sent by the network side equipment.

The second Timing adjustment information may include a Timing Advance (TA) adjustment value.

In the initial access process, the second timing adjustment information may be carried by the RAR.

After the initial access, the second timing adjustment information may be carried by the MAC CE.

For example, in the initial access process, the network side device uses the received PRACH preamble sequence to correlate with the local root sequence, detects the position of the correlation peak, and then detects the residual time offset, and the network side device converts the residual time offset into the number of bits corresponding to the TAC and sends the TAC to the UE along with the RAR.

And 105, determining the change rate of the TA adjustment value based on the first timing adjustment information and the second timing adjustment information.

In some embodiments, determining the TA adjustment value based on a rate of change of the TA adjustment value comprises:

step 1051, determine whether the change rate of the TA adjustment value is greater than a first threshold.

Specifically, after determining the change rate of the TA adjustment value, the UE compares the change rate of the TA adjustment value with a first threshold, and determines the change rate of the TA adjustment value and the first threshold.

The specific value of the first threshold may be configured according to actual situations, which is not illustrated here.

Step 1052, determining the TA adjustment value according to the second timing adjustment information, the time for receiving the second timing adjustment information, and the change rate of the TA adjustment value when the change rate of the TA adjustment value is greater than the first threshold value;

Specifically, when the change rate of the TA adjustment value is less than or equal to the first threshold, the UE still performs timing advance adjustment according to the TAC, that is, performs timing advance adjustment only when the TAC is received, determines the TA adjustment value according to the second timing adjustment information, the time when the second timing adjustment information is received, and the change rate of the TA adjustment value determined last time at the time when the TAC is not received, and adjusts the timing advance at any time according to the TA adjustment value.

And under the condition that the change rate of the TA adjusting value is greater than the first threshold value, determining the TA adjusting value according to the second timing adjusting information, the time for receiving the second timing adjusting information and the change rate of the TA adjusting value, and adjusting the timing advance at any moment according to the TA adjusting value.

In the embodiment of the application, when the change rate of the TA adjustment value is greater than the first threshold value, the TA adjustment value is determined based on the change rate of the TA adjustment value, and the timing advance at any moment is adjusted according to the TA adjustment value, so that the efficiency of the timing advance is improved.

And 106, determining a TA adjusting value based on the change rate of the TA adjusting value.

T ₂ ＝K(t ₂ -t ₁ )+T ₁ +α

wherein, T ₂ Is t ₂ TA adjustment value at time, K is the rate of change of TA adjustment value, t ₁ For the time of receiving the second timing adjustment information, T ₁ α is a preset correction value for the TA adjustment value included in the second timing adjustment information, and the value of α may be zero.

In the embodiment of the application, the TA adjustment value at any moment can be determined according to the change rate of the TA adjustment value, the TA adjustment value in the TAC received last time and the time of receiving the TAC last time, so that the accuracy of timing advance is improved.

And step 107, performing timing advance according to the TA adjustment value.

Specifically, after the TA adjustment value at any time is determined, the UE performs timing advance according to the TA adjustment value, thereby ensuring real-time synchronization.

The timing advance method provided by the embodiment of the application determines the change rate of the TA adjustment value based on the uplink signals twice, determines the adjustment value of the follow-up uplink TA based on the change rate of the TA adjustment value, can eliminate the defect that the TA adjustment value is inconsistent with the actual value due to inaccurate ephemeris information or high dynamic terminals, and improves the synchronization precision under the condition of inaccurate ephemeris information or high dynamic terminals.

In some embodiments, further comprising:

receiving a first indication message sent by network side equipment; the first indication message is used for indicating the terminal to send an uplink signal; the uplink signal includes a first uplink signal and a second uplink signal.

Specifically, in the embodiment of the present application, the UE transmits the uplink signal in an aperiodic manner.

Before the UE sends the uplink signal, the network side equipment determines a TA (timing advance) adjusting value according to the uplink signal sent last time by the UE, and under the condition that the TA adjusting value is larger than a second threshold value, the network side equipment sends a first indicating message to the UE, wherein the first indicating message is used for indicating the UE to send the uplink signal.

The specific value of the second threshold value may be configured according to practical situations, and is not illustrated here.

The UE receives a first indication message sent by the network side device, and sends an uplink signal, where the uplink signal may be a first uplink signal or a second uplink signal.

The first indication message may be triggered by a Radio Resource Control (RRC), MAC CE, and Downlink Control Information (DCI) command.

In the embodiment of the application, the first indication message sent by the network side device indicates the terminal to send the uplink signal in a non-periodic manner, so that correction can be performed in time under the condition of a large synchronization error, and the synchronization precision under the condition of inaccurate ephemeris information or a high-dynamic terminal is further improved.

In some embodiments, further comprising:

receiving a second indication message sent by the network side equipment; and the second indication message is used for indicating the terminal to send the uplink signal according to the target period.

Specifically, in the embodiment of the present application, the UE sends the uplink signal in a non-periodic and periodic combination manner.

And the network side equipment sends a second indication message to the UE, wherein the second indication message is used for indicating the UE to send the uplink signal according to the target period.

The target period may be associated with an update period of ephemeris information.

For example, the uplink signal transmission period can be configured to be 1/20, 1/15, 1/10, 1/5, 1/2, 1, etc. of the ephemeris information update period.

And the UE receives a second indication message sent by the network side equipment and periodically sends an uplink signal according to the target period. The uplink signal may be a first uplink signal and a second uplink signal.

The network side equipment determines a TA (timing advance) adjusting value according to an uplink signal sent by the UE last time, and sends a first indication message to the UE under the condition that the TA adjusting value is larger than a second threshold value, wherein the first indication message is used for indicating the UE to send the uplink signal.

And the UE receives a first indication message sent by the network side equipment and sends an uplink signal.

For example, the UE sends a first uplink signal and a second uplink signal according to the target period, the network side device receives the second uplink signal (the uplink signal that the UE sent last time), and determines a TA adjustment value according to the second uplink signal, and when the TA adjustment value is greater than a second threshold value, the network side device sends a first indication message and first timing adjustment information to the UE, where the first indication message is used to indicate the UE to send a third uplink signal.

And the UE receives a first indication message sent by the network side equipment and sends a third uplink signal.

And the network side equipment receives the third uplink signal, determines a TA (timing advance) adjustment value according to the third uplink signal and sends second timing adjustment information to the UE.

And the UE receives the first timing adjustment information and the second timing adjustment information sent by the network side equipment and updates the change rate of the TA adjustment value.

In the embodiment of the application, the uplink signal is sent in a non-periodic and periodic combined mode, so that the uplink signal can be corrected in time under the condition of large synchronization error, and the synchronization precision under the condition of inaccurate ephemeris information or high-dynamic terminal is further improved.

Fig. 2 is a second flowchart of the timing advance method according to the embodiment of the present application, and as shown in fig. 2, the embodiment of the present application provides a timing advance method, where an execution subject of the timing advance method may be a network side device, for example, a base station. The method comprises the following steps:

step 201, receiving a first uplink signal sent by a terminal.

Specifically, the UE sends a first uplink signal to the network side device.

The network side equipment receives a first uplink signal sent by the UE.

The uplink reference signal may be SRS, DMRS, PTRS.

Step 202, determining first timing adjustment information according to the first uplink signal, and sending the first timing adjustment information to the terminal.

The first timing adjustment information may include a TA adjustment value.

In the initial access process, the first timing adjustment information may be carried by the RAR.

After the initial access, the first timing adjustment information may be carried by the MAC CE.

And step 203, receiving the second uplink signal sent by the terminal.

Specifically, after receiving the first timing adjustment information, the UE advances the timing according to the first timing adjustment information, and sends the second uplink signal to the network side device.

And step 204, determining second timing adjustment information according to the second uplink signal, and sending the second timing adjustment information to the terminal.

The second timing adjustment information may include a TA adjustment value.

And the UE determines the change rate of the TA adjustment value based on the first timing adjustment information and the second timing adjustment information, determines the TA adjustment value based on the change rate of the TA adjustment value, and finally performs timing advance according to the TA adjustment value to realize uplink synchronization.

In some embodiments, in case that the TA adjustment value indicated by the second timing adjustment information is greater than the second threshold value, sending a first indication message to the terminal; the first indication message is used for indicating the terminal to send a third uplink signal.

The first indication message may be triggered by RRC, MAC CE, DCI command.

For example, the network side device determines a TA adjustment value according to the second uplink signal (the uplink signal that the UE has sent last time), and when the TA adjustment value is greater than the second threshold value, the network side device sends a first indication message to the UE, where the first indication message is used to indicate the UE to send the third uplink signal.

In the embodiment of the application, the uplink signal is sent in a non-periodic manner, so that the uplink signal can be corrected in time under the condition of a large synchronization error, and the synchronization precision under the condition of inaccurate ephemeris information or high-dynamic terminal is further improved.

In some embodiments, further comprising:

sending a second indication message to the terminal; the second indication message is used for indicating the terminal to send an uplink signal according to a target period; the uplink signal includes a first uplink signal and a second uplink signal.

For example, the UE sends a first uplink signal and a second uplink signal according to a target period, the network side device receives the second uplink signal (the uplink signal that the UE sent last time), and determines a TA adjustment value according to the second uplink signal, and when the TA adjustment value is greater than a second threshold value, the network side device sends a first indication message to the UE, where the first indication message is used to indicate the UE to send a third uplink signal.

In some embodiments, further comprising:

Specifically, in this embodiment of the present application, the UE sends the uplink signal according to a preset period, and the network side device may dynamically adjust the ephemeris information and the update period of the uplink signal according to information such as a Channel Quality Indicator (CQI) of the received uplink signal, a TA adjustment value, and the like.

And the network side equipment sends a third indication message to the UE, wherein the third indication message is used for indicating the UE to update the target period.

For example, when the TA adjustment value is greater than a certain threshold value, the network side device sends a third indication message to the UE, where the third indication message is used to indicate the UE to reduce the period for sending the uplink signal.

In the embodiment of the application, resource waste is avoided by dynamically adjusting the period for sending the uplink signal.

The method in the above embodiment is further described below with several specific examples.

Example 1:

fig. 3 is a schematic diagram of an initial access timing synchronization process according to an embodiment of the present application, where as shown in fig. 3, an initial access process uses closed-loop timing synchronization, and an initial access UE uses inaccurate ephemeris information for T _a And T _b The timing precompensation is implemented by the method that a network side (equipment) correlates a received PRACH preamble sequence with a local root sequence to detect the position of a correlation peak, namely, the residual time offset can be detected, the network side converts the residual time offset into the number of bits corresponding to the TAC and sends the number of bits to the UE along with RAR, the UE utilizes the received TAC to carry out closed-loop timing offset correction, and at the moment, the correction value sent by the TAC can be approximately equal to T _e . Wherein, T _a Transmission delay, T, for user link transmission _b The change time offset, T, corresponding to the user link caused by different receiving and transmitting time _e As ephemeris informationThe estimated delay time deviation delay caused by inaccurate or highly dynamic terminals (the terminal estimates the position or speed information inaccurately based on the GNSS).

And configuring an ephemeris information updating period and the like on the network side.

The network side carries Information such as Public verification Public key (PVT) parameters or ephemeris parameters of the satellite and random access channel opportunity (RACH occupancy, RO) resources required by an initial access process in a downlink main System Information Block (MIB) or a System Information Block (SIB), and periodically updates the Information.

After downlink synchronization is carried out by the terminal, a satellite ephemeris information updating period, PRACH (physical random access channel) sending resources and the like and PVT (physical vapor transport) parameters or ephemeris parameters of the satellite are obtained.

And the terminal calculates the change rate of the fixed TA adjustment value based on the inaccurate ephemeris information and the GNSS information of the terminal. Firstly, a terminal calculates time delay and change time delay corresponding to a service link according to position information of GNSS and change rate of ephemeris information and TA adjustment value, receives ephemeris information and the like at T1_1 time, performs uplink timing precompensation, sends PRACH (Msg 1) at T1_2 time, considers that the ephemeris information has errors, and calculates T at the moment _a And T _b Deviation from reality, approximately T _e 。

The network side estimates the residual timing deviation according to the PRACH received and detected at the time T2_1, and sends correction information (namely the residual timing deviation estimated by the PRACH detection) to the UE at the time T2_2 by using the TAC in the RAR (Msg 2), so that the TA adjustment value can be conveniently adjusted by the UE, and the uplink time synchronization is more accurate.

The terminal corrects the closed loop timing error according to the TAC command received at the moment of T3_1, and the time offset correction value issued by the TAC is approximate to T _e 1, sending a second PRACH (Msg 1) or an uplink reference signal to the satellite-borne base station at the time of T3_2, and carrying out T _a 、T _b Timing pre-compensation of.

And the network side receives and detects a second PRACH or an uplink reference signal at the time t4_1 to estimate the residual timing deviation, and transmits correction information to the UE at the time t4_2 by using the TAC in the RAR (Msg 2) for the UE to adjust the TA adjusting value.

The terminal corrects the closed loop timing error according to the TAC command received at the time T5_1, and the time offset correction value issued by the TAC is approximate to T _e 2, UE calculates T by using UE time stamp _e Rate of change Δ T of _e (rate of change in TA adjustment value = (T) _e 1-T _e 2) /(T3 _1-T5_ 1)), recording the time when the TAC is received, recording the time T _ N when the uplink signal is transmitted, and calculating T by using the timestamp _e ＝ΔT _e *(t _N -t5 ₁ )+T _e 2; transmitting Msg3 (uplink PUSCH) to the satellite-borne base station at time T5_2, and performing T at the moment _a 、T _b And T _e In which T is _e By means of T _e 2 and Δ T _e And UE timestamp calculation.

The network side receives and detects the Msg3 (uplink PUSCH) at the time of T6_1, and then feeds back Msg4 (downlink PDCCH/PDSCH) to the UE at the time of T6_2, thereby completing the initial access.

In the four-step initial access process, the change rate of the TA adjustment value is determined based on the two uplink signals, the adjustment value of the follow-up uplink TA is determined based on the change rate of the TA adjustment value, the defect that the TA adjustment value is inconsistent with the actual value due to inaccurate ephemeris information or high-dynamic terminals can be overcome, and the synchronization precision under the condition of inaccurate ephemeris information or high-dynamic terminals is improved.

Example 2:

fig. 4 is a second schematic diagram of the initial access timing synchronization process according to the embodiment of the present application, as shown in fig. 4, the initial access process utilizes closed-loop timing synchronization, and the initial access UE utilizes inaccurate ephemeris information for T _a And T _b The network side performs correlation by using the received PRACH preamble sequence and the local root sequence, detects the position of a correlation peak, namely detects the residual time offset, converts the residual time offset into the number of bits corresponding to the TAC and issues the bits to the UE along with the RAR, the UE performs closed-loop timing offset correction by using the received TAC, and at the moment, the correction value issued by the TAC can be approximately equal to T _e . Wherein, T _a Transmission delay, T, for user link transmission _b Variation of user link correspondence for different transmit-receive timesChange of time bias, T _e The estimated delay is the bias delay of the estimated delay caused by inaccurate ephemeris information or inaccurate position or speed information estimated by the terminal based on GNSS.

The network side carries the PVT parameters or ephemeris parameters of the satellite and the information such as RO resources required by the initial access process in the downlink MIB or SIB and updates periodically.

And after the terminal performs downlink synchronization, acquiring a satellite ephemeris information updating period, resources for sending PRACH and the like, and PVT parameters or ephemeris parameters of the satellite.

And the terminal calculates the change rate of the fixed TA adjustment value based on the inaccurate ephemeris information and the GNSS information of the terminal. Firstly, a terminal calculates the time delay and change time delay corresponding to a service link according to position information of GNSS and the change rate of ephemeris information and TA adjustment value, receives ephemeris information and the like at T1_1 time, carries out uplink timing pre-compensation, sends PRACH (MsgA) at T1_2 time, considers that the ephemeris information has errors, and calculates T at the moment _a And T _b Deviation from reality, approximately T _e 。

The network side estimates the residual timing deviation according to the PRACH received and detected at the time T2_1, and sends correction information (namely the residual timing deviation estimated by the PRACH detection) to the UE at the time T2_2 by using the TAC in the RAR (MsgB), so that the TA adjustment value can be conveniently adjusted by the UE, and the uplink time synchronization is more accurate.

The terminal corrects the closed loop timing error according to the TAC command received at the moment of T3_1, and the time offset correction value issued by the TAC is approximate to T _e 1, sending a second PRACH (MsgA) or an uplink reference signal to the satellite-borne base station at the time of T3_2, and carrying out T _a 、T _b Timing pre-compensation of.

And the network side receives and detects a second PRACH or an uplink reference signal at the time t4_1 to estimate the residual timing deviation, and transmits correction information to the UE at the time t4_2 by using the TAC in the RAR (MsgB) for the UE to adjust the TA adjusting value.

The terminal corrects the closed-loop timing error according to the TAC command received at the moment of t5_1,at this time, the time offset correction value issued by the TAC is approximate to T _e 2, UE calculates T by using UE time stamp _e Change rate of (Δ T) _e (rate of change in TA adjustment value = (T) _e 1-T _e 2) /(T3 _1-T5_ 1)), recording the time when the TAC is received, recording the time T _ N when the uplink signal is transmitted, and calculating T by using the timestamp _e ＝ΔT _e *(t _N -t5 ₁ )+T _e 2。

In the two-step initial access process, the change rate of the TA adjustment value is determined based on the uplink signals twice, and the adjustment value of the follow-up uplink TA is determined based on the change rate of the TA adjustment value, so that the defect that the TA adjustment value is inconsistent with the actual value due to inaccurate ephemeris information or high-dynamic terminals can be overcome, and the synchronization precision under the conditions of inaccurate ephemeris information or high-dynamic terminals is improved.

Example 3:

after initial access, a mode of combining open-loop timing maintenance and closed-loop timing maintenance can be used, namely, the terminal maintains uplink timing synchronization by itself, and the network side detection terminal estimates uplink timing deviation according to uplink signals sent in a non-periodic mode. The open-loop timing maintenance means that the terminal does not need a TA instruction of a network, the terminal automatically maintains uplink timing synchronization, and the closed loop aims to correct open-loop errors.

The network side carries out open-loop error correction based on an uplink reference signal (SRS/PTRS/DMRS) transmitted in a non-periodic manner, the non-periodic uplink reference signal is triggered by sending an RRC/MAC CE/DCI command through the network side, and a timing synchronization correction value is notified by using TAC.

And a network side configures an ephemeris information updating period, a non-periodic trigger uplink reference signal sending, a timing deviation threshold value issued by the TAC and the like.

And the network side carries the PVT parameters or the ephemeris parameters of the satellite in the downlink MIB or SIB and updates periodically.

And after the terminal performs downlink synchronization, acquiring a satellite ephemeris information updating period and the PVT parameters or ephemeris parameters of the satellite.

And the network side sends an RRC/MAC CE/DCI command to trigger the uplink reference signal under the condition of reaching a threshold value according to the information of the CQI of the received signal, the time deviation of the reference signal and the like.

And the terminal transmits the uplink reference signal according to the RRC/MAC CE/DCI command issued by the network side.

And the network side corrects the timing deviation according to the received aperiodic uplink reference signal, and transmits the correction information to the UE by using the TAC in the MAC CE for the UE to adjust the TA adjusting value so as to ensure that the uplink time synchronization is more accurate.

The terminal calculates T according to the time offset error received by the two latest TACs and the time stamp of the UE _e The rate of change of (c).

The terminal according to the position information, the ephemeris information and the T of the GNSS _e Rate of change Δ T of _e Calculating the corresponding time delay and the variation time delay of the service link, and utilizing the time stamp and the delta T _e Calculating T _e And performing uplink timing precompensation.

And the terminal periodically receives the ephemeris information according to the ephemeris information updating period configured by the network side. And the terminal corrects the closed-loop timing error according to the TAC command sent by the network side.

After initial access, the change rate of the TA adjustment value is determined based on two uplink signals sent by the UE in a non-periodic manner, and the adjustment value of the subsequent uplink TA is determined based on the change rate of the TA adjustment value, so that the defect that the TA adjustment value is inconsistent with the actual value due to inaccurate ephemeris information or high-dynamic terminals can be overcome, and the synchronization precision under the condition of inaccurate ephemeris information or high-dynamic terminals is improved.

Example 4:

after initial access, a mode of combining open-loop timing maintenance and closed-loop timing maintenance can be utilized, namely, the terminal self-maintains uplink timing synchronization, and the network side detects the uplink signal sent by the terminal according to the combination of period and non-period to estimate the uplink timing deviation. The open-loop timing maintenance means that the terminal does not need a TA instruction of a network, the terminal automatically maintains uplink timing synchronization, and the closed-loop aims to correct open-loop errors.

The network side carries out open-loop error correction based on uplink reference signals (SRS/PTRS/DMRS) sent periodically and aperiodically, the aperiodically uplink reference signals are triggered by sending RRC/MAC CE/DCI commands through the network side, and timing synchronization correction values are notified by using TAC.

And a network side configures an ephemeris information updating period, an uplink reference signal sending period (which can be configured as a period of 1/20, 1/15, 1/10, 1/5, 1/2, 1 of the ephemeris information updating period, etc.), a timing deviation threshold value for non-periodically triggering uplink reference signal sending and TAC sending, etc.

After the terminal performs downlink synchronization, a satellite ephemeris information updating period, an uplink reference signal sending period and a PVT parameter or ephemeris parameter of the satellite are obtained.

And the terminal periodically transmits the uplink reference signal according to the uplink reference signal transmission period configured by the network side.

The network side predicts information such as time deviation according to the received signals, dynamically adjusts the update period of ephemeris information and uplink reference signals when a certain threshold value is reached, or issues an RRC/MAC CE/DCI command to trigger aperiodic uplink reference signals when the threshold value is reached.

And the terminal transmits the non-periodic uplink reference signal according to the RRC/MAC CE/DCI command issued by the network side.

And the network side corrects the timing deviation according to the received periodic or non-periodic uplink reference signal, and transmits the correction information to the UE by using the TAC in the MAC CE for the UE to adjust the TA adjusting value so as to ensure that the uplink time synchronization is more accurate.

The terminal according to the position information, the ephemeris information and the T of the GNSS _e And calculating time delay by the change rate of the TAC, the time offset error and the change rate of the time offset error received by the TAC last time and the UE timestamp, and performing uplink timing pre-compensation.

And the terminal periodically receives the ephemeris information according to the ephemeris information updating period configured by the network side.

And the terminal corrects the closed-loop timing error according to the TAC command sent by the network side.

After initial access, the change rate of the TA adjustment value is determined based on two uplink signals sent by the UE according to the combination of the period and the non-period, and the adjustment value of the subsequent uplink TA is determined based on the change rate of the TA adjustment value, so that the defect that the TA adjustment value is inconsistent with the actual value due to inaccurate ephemeris information or high-dynamic terminals can be eliminated, and the synchronization precision under the conditions of inaccurate ephemeris information or high-dynamic terminals is improved.

Fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application, and as shown in fig. 5, the terminal includes a memory 520, a transceiver 500, and a processor 510, where:

a memory 520 for storing a computer program; a transceiver 500 for transceiving data under the control of the processor 510; a processor 510 for reading the computer program in the memory 520 and performing the following operations:

sending a first uplink signal to network side equipment;

sending a second uplink signal to the network side equipment;

and carrying out timing advance according to the TA adjusting value.

In particular, transceiver 500 is used to receive and transmit data under the control of processor 510.

Wherein in fig. 5, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 510, and various circuits, represented by memory 520, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 500 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over transmission media including wireless channels, wired channels, fiber optic cables, and the like. For different user devices, the user interface 530 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 510 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 510 in performing operations.

In some embodiments, the processor 510 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.

The processor is used for executing any one of the methods provided by the embodiment of the application according to the obtained executable instructions by calling the computer program stored in the memory. The processor and memory may also be physically separated.

judging whether the change rate of the TA adjusting value is greater than a first threshold value or not;

T ₂ ＝K(t ₂ -t ₁ )+T ₁

In some embodiments, further comprising:

It should be noted that, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is the terminal, and can achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.

Fig. 6 is a schematic structural diagram of a network-side device according to an embodiment of the present application, and as shown in fig. 6, the network-side device includes a memory 620, a transceiver 600, and a processor 610, where:

a memory 620 for storing a computer program; a transceiver 600 for transceiving data under the control of the processor 610; a processor 610 for reading the computer program in the memory 620 and performing the following operations:

receiving a first uplink signal sent by a terminal;

receiving a second uplink signal sent by the terminal;

In particular, the transceiver 600 is used to receive and transmit data under the control of the processor 610.

Wherein in fig. 6, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 610, and various circuits, represented by memory 620, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 600 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 610 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 610 in performing operations.

The processor 610 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

In some embodiments, further comprising:

Specifically, the network side device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is the network side device, and can achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.

Fig. 7 is a schematic structural diagram of a timing advance device provided in an embodiment of the present application, and as shown in fig. 7, the embodiment of the present application provides a timing advance device, which includes a first sending module 701, a first receiving module 702, a second sending module 703, a second receiving module 704, a first determining module 705, a second determining module 706, and a timing advance module 707, where:

the first sending module 701 is configured to send a first uplink signal to a network side device; a first receiving module 702 is configured to receive first timing adjustment information sent by the network side device; the second sending module 703 is configured to send a second uplink signal to the network side device; the second receiving module 704 is configured to receive second timing adjustment information sent by the network side device; the first determining module 705 is configured to determine a change rate of a timing advance TA adjustment value based on the first timing adjustment information and the second timing adjustment information; the second determining module 706 is configured to determine a TA adjustment value based on a rate of change of the TA adjustment value; the timing advance module 707 is configured to advance timing according to the TA adjustment value.

In some embodiments, the second determination module comprises a determination submodule and a first determination submodule, wherein:

the judgment submodule is used for judging whether the change rate of the TA adjusting value is greater than a first threshold value or not;

the first determining submodule is configured to determine a TA adjustment value according to the second timing adjustment information, the time when the second timing adjustment information is received, and the change rate of the TA adjustment value, when the change rate of the TA adjustment value is greater than the first threshold value;

T ₂ ＝K(t ₂ -t ₁ )+T ₁

wherein, T ₂ Is t ₂ TA adjustment value at time, K is the rate of change of TA adjustment value, t ₁ Time for receiving the second timing adjustment information, T ₁ And adjusting the TA value contained in the second timing adjustment information.

In some embodiments, a fifth receiving module is further included;

the fifth receiving module is configured to receive a first indication message sent by the network side device; the first indication message is used for indicating the terminal to send an uplink signal; the uplink signal includes the first uplink signal and the second uplink signal.

In some embodiments, a sixth receiving module is further included;

the sixth receiving module is configured to receive a second indication message sent by the network side device; the second indication message is used for indicating the terminal to send the uplink signal according to a target period.

Specifically, the timing advance device provided in this embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is the terminal, and can achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.

Fig. 8 is a second schematic structural diagram of a timing advance device according to an embodiment of the present application, and as shown in fig. 8, the embodiment of the present application provides a timing advance device including a third receiving module 801, a third determining module 802, a fourth receiving module 803, and a fourth determining module 804, where:

the third receiving module 801 is configured to receive a first uplink signal sent by a terminal; the third determining module 802 is configured to determine first timing adjustment information according to the first uplink signal, and send the first timing adjustment information to the terminal; a fourth receiving module 803 is configured to receive a second uplink signal sent by the terminal; the fourth determining module 804 is configured to determine second timing adjustment information according to the second uplink signal, and send the second timing adjustment information to the terminal.

In some embodiments, a third sending module is further included;

the third sending module is configured to send a first indication message to the terminal when the TA adjustment value indicated by the second timing adjustment information is greater than a second threshold value; the first indication message is used for indicating the terminal to send a third uplink signal.

In some embodiments, a fourth sending module is further included;

the fourth sending module is configured to send a second indication message to the terminal; the second indication message is used for indicating the terminal to send an uplink signal according to a target period; the uplink signal includes the first uplink signal and the second uplink signal.

In some embodiments, a fifth sending module is further included;

the fifth sending module is configured to send a third indication message to the terminal, where the third indication message is used to indicate the terminal to update the target period.

Specifically, the timing advance device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is a network side device, and can achieve the same technical effects, and details of the same parts and beneficial effects as in the method embodiment in this embodiment are not described herein again.

It should be noted that, in the foregoing embodiments of the present application, the division of the units/modules is schematic, and is only a logic function division, and another division manner may be used in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

In some embodiments, there is also provided a processor-readable storage medium storing a computer program for causing a processor to perform the method provided by the above embodiments, including:

sending a first uplink signal to network side equipment; receiving first timing adjustment information sent by the network side equipment; sending a second uplink signal to the network side equipment; receiving second timing adjustment information sent by the network side equipment; determining a rate of change of a Timing Advance (TA) adjustment value based on the first timing adjustment information and the second timing adjustment information; determining a TA adjustment value based on a rate of change of the TA adjustment value; and carrying out timing advance according to the TA adjusting value.

Or comprises the following steps:

receiving a first uplink signal sent by a terminal; determining first timing adjustment information according to the first uplink signal, and sending the first timing adjustment information to the terminal; receiving a second uplink signal sent by the terminal; and determining second timing adjustment information according to the second uplink signal, and sending the second timing adjustment information to the terminal.

It should be noted that: the processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), solid State Disks (SSDs)), etc.

In addition, it should be noted that: the terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between similar elements and not for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" used herein generally refer to a class and do not limit the number of objects, for example, a first object can be one or more.

In the embodiment of the present application, the term "and/or" describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a long term evolution (long term evolution, LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an LTE-a (long term evolution) system, a universal mobile system (universal mobile telecommunications system, UMTS), a universal internet Access (WiMAX) system, a New Radio Network (NR) system, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be referred to as a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile phone (or called a "cellular" phone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange languages and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for providing services to a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames and Internet Protocol (IP) packets with one another as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communications network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or an e-NodeB) in a Long Term Evolution (LTE) System, a 5G Base Station (gNB) in a 5G network architecture (next generation System), a Home evolved Node B (HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico), and the like, which are not limited in the embodiments of the present application. In some network configurations, a network device may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

Multiple Input Multiple Output (MIMO) transmission may be performed between the network device and the terminal device by using one or more antennas, where the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of root antenna combinations.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A timing advance method, comprising:

sending a first uplink signal to network side equipment;

sending a second uplink signal to the network side equipment;

and carrying out timing advance according to the TA adjusting value.

2. The timing advance method of claim 1 wherein determining a TA adjustment value based on a rate of change of the TA adjustment value comprises:

3. The timing advance method of claim 2, wherein the TA adjustment value is determined by the following calculation:

T ₂ ＝K(t ₂ -t ₁ )+T ₁

4. The timing advance method of claim 1, further comprising:

5. The timing advance method of claim 4, further comprising:

6. The timing advance method according to claim 4 or 5, wherein in an initial access process, the first uplink signal is a PRACH signal, and the second uplink signal is a PRACH signal or an uplink reference signal;

7. A timing advance method, comprising:

receiving a first uplink signal sent by a terminal;

receiving a second uplink signal sent by the terminal;

8. The timing advance method according to claim 7, wherein in case that the TA adjustment value indicated by the second timing adjustment information is greater than a second threshold value, a first indication message is sent to the terminal; the first indication message is used for indicating the terminal to send a third uplink signal.

9. The timing advance method of claim 8, further comprising:

10. The timing advance method according to claim 9, wherein in an initial access procedure, the first uplink signal is a PRACH signal, and the second uplink signal is a PRACH signal or an uplink reference signal;

11. The timing advance method of claim 9, further comprising:

12. A terminal comprising a memory, a transceiver, a processor;

sending a first uplink signal to network side equipment;

sending a second uplink signal to the network side equipment;

and carrying out timing advance according to the TA adjusting value.

13. The terminal of claim 12, wherein determining a TA adjustment value based on a rate of change of the TA adjustment value comprises:

when the change rate of the TA adjustment value is larger than the first threshold value, determining a TA adjustment value according to the second timing adjustment information, the time for receiving the second timing adjustment information and the change rate of the TA adjustment value;

14. The terminal of claim 13, wherein the TA adjustment value is determined according to the following equation:

T ₂ ＝K(t ₂ -t ₁ )+T ₁

15. The terminal of claim 12, further comprising:

16. The terminal of claim 15, further comprising:

17. The terminal according to claim 15 or 16, wherein in an initial access procedure, the first uplink signal is a PRACH signal, and the second uplink signal is a PRACH signal or an uplink reference signal;

18. A network-side device, comprising a memory, a transceiver, a processor;

receiving a first uplink signal sent by a terminal;

receiving a second uplink signal sent by the terminal;

19. The network-side device according to claim 18, wherein when the TA adjustment value indicated by the second timing adjustment information is greater than a second threshold value, a first indication message is sent to the terminal; the first indication message is used for indicating the terminal to send a third uplink signal.

20. The network-side device of claim 19, further comprising:

21. The network-side device of claim 20, wherein in an initial access procedure, the first uplink signal is a PRACH signal, and the second uplink signal is a PRACH signal or an uplink reference signal;

22. The network-side device of claim 20, further comprising:

23. A timing advance device, comprising:

a first determining module, configured to determine a variation rate of a timing advance TA adjustment value based on the first timing adjustment information and the second timing adjustment information;

24. A timing advance device, comprising:

25. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to execute the timing advance method of any one of claims 1 to 11.