CN107666704B - A kind of method and user equipment of reboot time calibration TA timer - Google Patents

A kind of method and user equipment of reboot time calibration TA timer Download PDF

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Publication number
CN107666704B
CN107666704B CN201610618723.7A CN201610618723A CN107666704B CN 107666704 B CN107666704 B CN 107666704B CN 201610618723 A CN201610618723 A CN 201610618723A CN 107666704 B CN107666704 B CN 107666704B
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timer
duration
new
restarting
existing
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CN107666704A (en
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冯小朋
韩虎贲
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Shenzhen ZTE Microelectronics Technology Co Ltd
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Shenzhen ZTE Microelectronics Technology Co Ltd
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Priority to PCT/CN2017/088674 priority patent/WO2018019052A1/en
Priority to BR112019001840-9A priority patent/BR112019001840A2/en
Priority to RU2019104130A priority patent/RU2707173C1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Measurement Of Predetermined Time Intervals (AREA)
  • Electric Clocks (AREA)

Abstract

The embodiment of the invention discloses a kind of method and apparatus of reboot time calibration TA timer；When this method may include: that the TA timer of UE is in operating status, new TA timer duration is received；The UE restarts strategy and restarts TA timer according to the new TA timer duration and existing TA timer duration according to preset；The overtime duration for restarting rear TA timer is set the new TA timer duration by the UE.

Description

Method for restarting time calibration TA timer and user equipment
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for restarting a Time Alignment Timer (TA Timer).
Background
In a network structure of a current Long Term Evolution (LTE) system, an evolved node b (eNB, eNodeB) may update a duration of a TA timer in user Equipment (ue) in some scenarios but does not send a restart command for the TA timer; therefore, the UE cannot start or restart the TA timer through the restart command of the TA timer, which causes abnormal flow processing caused by inconsistency of TA timer information in subsequent interaction processes between the UE and the eNodeB.
For example, the eNodeB may carry the timeAlignmentTimerCommon in the system information SystemInformationBlockType2, so that the UE receives a Random Access Response (RAR) in the random access process and then analyzes the RAR to obtain the timeAlignmentTimerCommon; and configures the timeAlignmentTimerCommon as the timeout duration of the TA timer Cell-specific.
In the connection establishment process of Radio Resource Control (RRC), the eNodeB may carry a radioresourceconfigdetermined content in an RRC connection setup message RRCConnectionSetup, an RRC connection reestablishment message rrcconnectionrequest, or an RRC connection reconfiguration message RRCConnectionReconfiguration; the mac-MainConfig cell in the radioResourceConfigDedcated content carries timeAlignmentTimeDmodified; after the UE can obtain the timealignmenttimedescription by analyzing the message, the timealignmenttimedescription is configured as the timeout duration of the TA timer UE-specific. It is understood that if the UE configures the UE-specific timeout period, the UE uses the timeout value, otherwise the UE uses the Cell-specific timeout value.
When the timer is different from the timer common and the value of one of the two is infinite, the eNodeB notifies the UE that the TA timer update duration is the timer, but does not send a restart command of the TA timer to the UE. Since the UE needs to start or restart the TA timer by relying on the restart command of the TA timer, the timealignmenttimemodified sent by the eNodeB to the UE will not take effect at the UE, which may cause the problem of abnormal processing caused by inconsistency of the TA timer information in the interaction process between the UE and the eNodeB.
Disclosure of Invention
In order to solve the foregoing technical problems, embodiments of the present invention are intended to provide a method and an apparatus for restarting a TA timer, which can avoid the problem of processing exception caused by inconsistency of information of the TA timer in an interaction process between a UE and an eNodeB.
The technical scheme of the invention is realized as follows:
the embodiment of the invention provides a method for restarting a TA timer, which is applied to a UE side of user equipment and comprises the following steps:
when the TA timer of the UE is in a running state, receiving a new TA timer duration;
the UE restarts the TA timer according to the new TA timer duration and the existing TA timer duration and a preset restarting strategy;
and the UE sets the timeout duration of the restarted TA timer as the duration of the new TA timer.
In the foregoing solution, the UE restarting the TA timer according to the existing TA timer duration and the new TA timer duration according to the preset restart policy specifically includes:
when the duration of the existing TA timer is unlimited and the duration of the new TA timer is limited, the UE starts a monitoring timer and sets the duration of the monitoring timer to be less than the duration of the new TA timer;
and when the monitoring timer is overtime and the UE does not receive a TA timer restarting command in the timing process of the monitoring timer, the UE restarts the TA timer.
In the above aspect, the method further includes:
and when the UE receives the TA timer restarting command in the process of timing the monitoring timer, deleting the monitoring timer and restarting the TA timer by the UE.
In the foregoing solution, the UE restarting the TA timer according to the existing TA timer duration and the new TA timer duration according to the preset restart policy specifically includes:
when the time length of the existing TA timer is a finite value and the time length of the new TA timer is an infinite value, the UE monitors a TA timer restart command;
and when the TA timer times out according to the length of the existing TA timer and a TA timer restart command is not received, the UE restarts the TA timer.
In the above scheme, the length of the existing TA timer is carried in a random access response RAR received by the UE in a random access process;
the new TA timer duration is carried in a mac-MainConfig cell in an RRC connection setup message, an RRC connection reestablishment message, or an RRC connection reconfiguration message.
In a second aspect, an embodiment of the present invention provides a UE, where the UE includes: the device comprises a TA timer, a receiving module, a restarting module and a setting module; wherein,
the receiving module is used for receiving the new TA timer duration when the TA timer is in the running state;
the restarting module is used for restarting the TA timer according to the new TA timer duration and the existing TA timer duration and a preset restarting strategy;
and the setting module is used for setting the timeout duration of the restarted TA timer as the duration of the new TA timer.
In the foregoing solution, the restart module is configured to:
when the duration of the existing TA timer is unlimited and the duration of the new TA timer is limited, starting a monitoring timer, and setting the duration of the monitoring timer to be less than the duration of the new TA timer;
and when the monitoring timer is overtime and the receiving module does not receive a TA timer restarting command in the timing process of the monitoring timer, restarting the TA timer.
In the foregoing solution, the restart module is further configured to delete the monitoring timer and restart the TA timer when the receiving module receives the TA timer restart command in a timing process of the monitoring timer.
In the foregoing solution, the restart module is configured to:
when the time length of the existing TA timer is a finite value and the time length of the new TA timer is an infinite value, monitoring a TA timer restart command;
and when the TA timer times out according to the length of the existing TA timer, and the receiving module does not receive a TA timer restarting command, restarting the TA timer.
In the above scheme, the length of the existing TA timer is carried in a random access response RAR received by the receiving module;
the new TA timer duration is carried in a mac-MainConfig cell in an RRC connection setup message, an RRC connection reestablishment message, or an RRC connection reconfiguration message.
The embodiment of the invention provides a method and a device for restarting a TA timer, wherein the TA timer is automatically restarted according to a preset restarting strategy after UE receives the time length of a new TA timer, so that the problem of processing abnormity caused by inconsistent information of the TA timer in the interaction process of the UE and an eNodeB is avoided.
Drawings
Fig. 1 is a flowchart illustrating a method for restarting a TA timer according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a specific implementation of a method for restarting a TA timer according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating an implementation of another method for restarting a TA timer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a UE according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example one
Referring to fig. 1, it shows a method for restarting a TA timer according to an embodiment of the present invention, where the method is applied to a UE side, and may include:
s101: when a TA timer of the UE is in a running state, receiving a new TA timer duration;
s102: the UE restarts the TA timer according to the new TA timer duration and the existing TA timer duration and a preset restarting strategy;
s103: and the UE sets the timeout duration of the restarted TA timer as the duration of the new TA timer.
Exemplarily, in the present technical solution, the duration of the existing TA timer is carried in a random access response RAR received by the UE in the random access process, and specifically may be a timeAlignmentTimerCommon carried in system information SystemInformationBlockType 2;
the new TA timer duration is carried in a mac-MainConfig cell in an RRC connection establishment message, an RRC connection reestablishment message or an RRC connection reconfiguration message; specifically, the time information may be a timealignmenttimeinformation carried by a mac-MainConfig cell in the RadioResourceConfigDedicated.
In the embodiment of the present invention, the value of the TA timer duration may be shown by the following pseudo code:
TimeAlignmentTimer::＝ENUMERATED{
sf500,sf750,sf1280,sf1920,sf2560,sf5120,sf10240,infinity}。
it is understood that infinity represents an infinite value, and values other than infinity are finite values.
It should be noted that, for the restart method of the TA timer described in the background art, on one hand, when the value of timeAlignmentTimerCommon is infinity but the timealignmenttimedcondate is not, the eNodeB considers that the UE uses the new TA timer duration timealignmenttimeteddicated after updating the TA timer duration to timealignmenttimedcondate, but the UE does not receive the TA timer restart command, so the UE does not use the new TA timer duration timealignmenttimetedimeded, and thus the eNodeB considers that the UE should be out of step when there is no data service, but the TA timer of the UE is not overtime, and therefore the UE does not judge out of out-of-step state, and thus affects the functions of the UE such as power saving;
on the other hand, when the timeAlignmentTimerCommon value is not in limit but the timealignmenttimedconducted is in limit, the eNodeB considers that the UE should not have uplink desynchronization caused by TA timer timeout after updating the TA timer duration to be timealignmenttimedconducted, but the UE still uses the existing TA timer duration timeAlignmentTimerCommon because the UE does not receive the TA timer restart command, so that the UE initiates random access after the existing TA timer is overtime, thereby causing the eNodeB to process abnormal and cutoff phenomena.
For the above-described problem, the technical solution shown in fig. 1 can solve the above-described problem in a targeted manner, and the UE restarts the TA timer according to a preset restart policy after receiving a new TA timer duration, so as to avoid the problem of processing abnormality caused by inconsistency of information of the TA timer in an interaction process between the UE and the eNodeB.
For the two problems in the above description, the present embodiment correspondingly proposes two specific exemplary solutions based on the technical solution shown in fig. 1 to solve the two problems.
Illustratively, to solve the problem of the first aspect in the background art, the restarting, by the UE, the TA timer according to the existing TA timer duration and the new TA timer duration and according to the preset restart policy specifically includes:
when the duration of the existing TA timer is unlimited and the duration of the new TA timer is limited, the UE starts a monitoring timer and sets the duration of the monitoring timer to be less than the duration of the new TA timer;
and when the monitoring timer is overtime and the UE does not receive a TA timer restarting command in the timing process of the monitoring timer, the UE restarts the TA timer.
Further, the above example may further include: and when the UE receives the TA timer restarting command in the process of timing the monitoring timer, deleting the monitoring timer and restarting the TA timer by the UE.
In the above exemplary implementation, if the existing TA timer duration tatimereold is unlimited and the new TA timer duration TATimerNew is not infinite, a new monitoring timer TacMonitorTimer may be started, and (TATimerNew-10) milliseconds ms is used as the duration of the TacMonitorTimer; it is understood that the duration of the TacMonitorTimer may be set to a value slightly less than TATimerNew, and this specific implementation is illustrated as being less than 10 ms.
If the UE receives a TA timer restart command sent by the eNodeB before the TacMyonitor times out, restarting the TA timer by using TATimerNew according to the existing protocol, and deleting the monitoring timer TacMyonitor at the same time;
if the UE does not receive the TA timer restart command sent by the eNodeB after the TacMonitorTimer expires, the UE considers that the eNodeB fails to send the TA timer restart command, and at this time, the UE may restart the TA timer by using TATimerNew, and the subsequent process is processed according to the protocol.
Illustratively, to solve the problem in the second aspect of the background art, the restarting, by the UE, the TA timer according to the existing TA timer duration and the new TA timer duration and according to the preset restart policy specifically includes:
when the time length of the existing TA timer is a finite value and the time length of the new TA timer is an infinite value, the UE monitors a TA timer restart command;
and when the TA timer times out according to the length of the existing TA timer and a TA timer restart command is not received, the UE restarts the TA timer.
In the foregoing example implementation procedure, if TATimerOld is not infinity and tatimesnew is infinity, the UE may keep the TA timer running according to TATimerOld and wait for a TA timer restart command that may be issued by the eNodeB.
If the TA timer running process receives a TA timer restarting command issued by the eNodeB, restarting the TA timer by using TATimerNew according to the existing protocol;
if the TA timer is overtime and does not receive a TA timer restart command issued by the eNodeB, the UE does not consider to be out of synchronization, and can restart the TA timer by using TATimerNew.
It can be understood that when both tatimereold and TATimerNew are infinity, no UE out-of-sync is triggered, and processing is performed according to the existing protocol flow;
when neither tatimereold nor TATimerNew is infinite, the eNodeB will issue a TA timer restart command to the UE, and the subsequent process is still processed according to the existing protocol.
In the method for restarting the TA timer provided by this embodiment, after receiving the new TA timer duration, the UE automatically restarts the TA timer according to a preset restart policy, so as to avoid a problem of processing abnormality caused by inconsistency of information of the TA timer in an interaction process between the UE and the eNodeB.
Example two
Based on the same technical concept of the foregoing embodiments, the present embodiment provides two specific implementation examples.
Detailed description of the preferred embodiment
Referring to fig. 2, a specific implementation flow of a method for restarting a TA timer according to an embodiment of the present invention is shown, and applied to a UE, the method may include:
s200: the UE receives the new TA timer and proceeds to S201.
S201: the UE determines whether the TA timer is running. If not, the UE is in the out-of-step state, and the S213 is switched to process according to the protocol flow; otherwise go to S202.
S202: the UE determines whether tatimerlold is infinite. If not, go to S203; otherwise go to S204.
S203: the UE determines whether TATimerNew is infinite. If not, go to S213 to process according to the protocol flow; otherwise go to S206.
S204: the UE determines whether TATimerNew is infinite. If yes, go to S213 to process according to the protocol flow; otherwise go to S205.
S205: the UE starts a watchdog timer, TacMonitorTimer, using (TATimerNew-10) ms. Setting a flag bfrom infinity valid, and going to S207;
s206: the UE sets the flag bToInfinity to be valid, waits for the TA timer to time out or the eNodeB issues a TA timer restart command, and goes to S207;
s207: the UE determines whether a TA timer restart command is received before the watchdog timer expires, and if so, goes to S212; otherwise go to S208.
S208: the UE determines whether bfrom infinity is valid. If yes, go to S212; otherwise go to S209.
S209: the UE determines whether bToInfinity is valid. If yes, go to S211; s210 if both bToInfinity and bFromInfinity are invalid;
it is to be understood that there is no case where bToInfinity and bfrom infinity are simultaneously active.
S210: and the timer is overtime and is processed according to the loss of synchronism of the UE, and the process is ended.
S211: and the UE clears the bToInfinity mark, restarts the TA timer according to TATimerNew, and ends the process. It is understood that TATimerNew is infinity at this time.
S212: and the UE clears the mark bFromInfinity and the mark bToInfinity, restarts the TA timer according to the time length of TATimerNew, and ends the process.
S213: after processing according to the protocol flow, the flow is ended.
It should be noted that, in the first embodiment, a specific flow of a method for solving that the base station side does not issue the TA timer restart command in a comprehensive manner is provided, and a situation that the base station side may issue the TA timer restart command while waiting for processing is considered. In a specific implementation process, a TA timer restart command issued by a base station side does not need to be considered, but when a TA timer changes from an infinite length to a finite length or from the finite length to the infinite length, the TA timer can be restarted by directly using a new TA timer duration, so that the encountered problems can be solved. The detailed process can be seen in the second embodiment.
Detailed description of the invention
Referring to fig. 3, a specific implementation flow of another method for restarting a TA timer according to an embodiment of the present invention is shown, and applied to a UE, the method may include:
s300: the UE receives the new TA timer and proceeds to S301.
S301: the UE determines whether the TA timer is running. If not, go to S306 to process according to the protocol flow; otherwise go to S302.
S302: the UE determines whether tatimerlold is infinite. If not, go to S303; otherwise go to S304.
S303: the UE determines whether TATimerNew is infinite. If not, go to S306 to process according to the protocol flow; otherwise go to S305.
S304: the UE determines whether TATimerNew is infinite. If yes, go to S306 to process according to the protocol flow; otherwise go to S305.
S305: and the UE restarts the TA timer by using the TATimerNew, and the process is ended.
The present embodiment describes the method for restarting the TA timer in the first embodiment in detail through two specific embodiments. The TA timer is automatically restarted after the UE receives the new TA timer duration, so that the problem of processing abnormity caused by inconsistent information of the TA timer in the interaction process of the UE and the eNodeB is avoided.
EXAMPLE III
Based on the same technical concept of the foregoing embodiments, referring to fig. 4, it illustrates a UE 40 provided in an embodiment of the present invention, where the UE 40 includes: a TA timer 401, a receiving module 402, a restarting module 403 and a setting module 404; wherein,
the receiving module 402 is configured to receive a new TA timer duration when the TA timer 401 is in an operating state;
the restart module 403 is configured to restart the TA timer 401 according to the new TA timer duration and the existing TA timer duration and according to a preset restart policy;
the setting module 404 is configured to set the timeout duration of the restarted TA timer 401 to the new TA timer duration.
In the above scheme, the restart module 403 is configured to:
when the duration of the existing TA timer is unlimited and the duration of the new TA timer is limited, starting a monitoring timer, and setting the duration of the monitoring timer to be less than the duration of the new TA timer;
when the watchdog timer expires and the receiving module 402 does not receive a TA timer restart command during the watchdog timer, the TA timer 401 is restarted.
In the above scheme, the restarting module 403 is further configured to, when the receiving module 402 receives the TA timer restart command during the monitoring timer counting process, delete the monitoring timer and restart the TA timer 401.
In the above scheme, the restart module 403 is configured to:
when the time length of the existing TA timer is a finite value and the time length of the new TA timer is an infinite value, monitoring a TA timer restart command;
when the TA timer 401 times out according to the duration of the existing TA timer, and the receiving module 402 does not receive a TA timer restart command, the TA timer 401 is restarted.
In the above scheme, the length of the existing TA timer is loaded in a random access response RAR received by the receiving module 402;
the new TA timer duration is carried in a mac-MainConfig cell in an RRC connection setup message, an RRC connection reestablishment message, or an RRC connection reconfiguration message.
According to the UE provided by the embodiment, after the new TA timer duration is received, the TA timer is automatically restarted according to the preset restart strategy, so that the problem of processing abnormity caused by inconsistency of information of the TA timer in the interaction process of the UE and the eNodeB is avoided.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 program instructions. These computer program 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 computer program instructions may also be stored in a computer-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 computer-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 computer program 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.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (6)

1. A method for restarting a Time Alignment (TA) timer, the method being applied to a User Equipment (UE), the method comprising:
when the TA timer of the UE is in a running state, receiving a new TA timer duration;
the UE restarts the TA timer according to the new TA timer duration and the existing TA timer duration and a preset restarting strategy;
the UE sets the timeout duration of the TA timer after restarting as the new TA timer duration,
the UE restarting the TA timer according to the new TA timer duration and the existing TA timer duration according to a preset restart policy specifically includes:
when the duration of the existing TA timer is unlimited and the duration of the new TA timer is limited, the UE starts a monitoring timer and sets the duration of the monitoring timer to be less than the duration of the new TA timer;
when the monitoring timer is overtime and the UE does not receive a TA timer restarting command in the monitoring timer timing process, the UE restarts the TA timer,
or,
the UE restarting the TA timer according to the new TA timer duration and the existing TA timer duration according to a preset restart policy, specifically including:
when the time length of the existing TA timer is a finite value and the time length of the new TA timer is an infinite value, the UE monitors a TA timer restart command;
and when the TA timer times out according to the length of the existing TA timer and a TA timer restart command is not received, the UE restarts the TA timer.
2. The method of claim 1, further comprising:
and when the UE receives the TA timer restarting command in the process of timing the monitoring timer, deleting the monitoring timer and restarting the TA timer by the UE.
3. The method according to claim 1, wherein said existing TA timer duration is carried in a random access response, RAR, received by said UE during a random access procedure;
the new TA timer duration is carried in a mac-MainConfig cell in an RRC connection setup message, an RRC connection reestablishment message, or an RRC connection reconfiguration message.
4. A User Equipment (UE), the UE comprising: the device comprises a TA timer, a receiving module, a restarting module and a setting module; wherein,
the receiving module is used for receiving the new TA timer duration when the TA timer is in the running state;
the restarting module is used for restarting the TA timer according to the new TA timer duration and the existing TA timer duration and a preset restarting strategy;
the setting module is used for setting the timeout duration of the restarted TA timer as the duration of the new TA timer,
wherein the restart module is configured to:
when the duration of the existing TA timer is unlimited and the duration of the new TA timer is limited, starting a monitoring timer, and setting the duration of the monitoring timer to be less than the duration of the new TA timer;
restarting the TA timer when the monitoring timer is overtime and the receiving module does not receive a TA timer restart command in the timing process of the monitoring timer,
or,
the restart module is configured to:
when the time length of the existing TA timer is a finite value and the time length of the new TA timer is an infinite value, monitoring a TA timer restart command;
and when the TA timer times out according to the length of the existing TA timer, and the receiving module does not receive a TA timer restarting command, restarting the TA timer.
5. The UE of claim 4, wherein the restart module is further configured to delete the watchdog timer and restart the TA timer when the TA timer restart command is received by the receiving module during the watchdog timer.
6. The UE according to claim 4, wherein the existing TA timer duration is carried in a Random Access Response (RAR) received by the receiving module;
the new TA timer duration is carried in a mac-MainConfig cell in an RRC connection setup message, an RRC connection reestablishment message, or an RRC connection reconfiguration message.
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Application Number Priority Date Filing Date Title
CN201610618723.7A CN107666704B (en) 2016-07-29 2016-07-29 A kind of method and user equipment of reboot time calibration TA timer
PCT/CN2017/088674 WO2018019052A1 (en) 2016-07-29 2017-06-16 Method and device for restarting time alignment (ta) timer, and storage medium
BR112019001840-9A BR112019001840A2 (en) 2016-07-29 2017-06-16 method and apparatus for resetting a computer-readable time alignment (ta) timer, user equipment and storage medium
RU2019104130A RU2707173C1 (en) 2016-07-29 2017-06-16 Method and device for time alignment timer restarting, as well as data medium

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