Sending method for TA (Time Advance) regulating command of LTE (Long Term Evolution) and base station

Abstract

The invention relates to a sending method for a TA (Time Advance) regulating command of LTE (Long Term Evolution) and a base station. The method comprises the following steps of: S110, generating the TA regulating command by the base station; S120, issuing the TA regulating command to UE (User Equipment) by the base station through the certain time and the corresponding HARQ (Hybrid Automatic Repeat Request) course and adding 1 for the value of a Counter of the HARQ course; S130, judging whether to send the TA regulating command again or not by the base station according to whether ACK (Acknowledgement) of the HARQ course fed back by the UE is received or not, executing step S140 if the ACK is not received, and executing step S160 if the ACK is received; S140, judging whether the Counter is less than MaxNum or not, executing step S 120 and issuing the TA regulating command through the other HARQ course if so, and executing step S150 if not; S150, waiting for the timeout of a TA timer; and S160, restarting the TA timer after the timeout of the TA timer so that the situation of upstream step failing out caused by the timeout of the TA timer can be avoided.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for sending an LTE time advance adjustment command and a base station. Background technique [0002] In an LTE (Long Term Evolution, long-term evolution) system, a time advance (Time Advance, TA) is a parameter used to characterize the timing deviation of eNodeB (evolved base station) receiving data sent by UE (User Equipment, user equipment). In order to maintain uplink synchronization, the eNodeB instructs the UE to send DMRS (Demodulation reference signal, uplink demodulation reference signal) or SRS (sounding reference signal, sounding reference signal) at a specified time point. After timing measurement to obtain TA, the eNodeB shares the channel through the physical downlink Send the timing advance adjustment command to the UE for adjustment, so as to maintain the uplink synchronization between the UE and the eNodeB. [0003] In LTE, the time advanc...

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Problems solved by technology

[0004] In the prior art, the base station generally calculates the time advance adjustment command according to the measured TA value, and then notifies the UE to adjust the TA. If HARQ (Hybrid Automatic RepeatreQuest, hybrid automatic repeat request) retransmission fails at this time, that is If the UE still fails to receive the time advance adjustment command correctly after multiple retransmissions combined, it will feed back NACK (rejection confirmation information), and the base station will cause The TA timer expires, causing uplink out-of-sync and UE re-access, causing the UE traffic to drop, and the phenomenon of "ditching" occurs

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