Method, system and device for time synchronization in mobile communication system

Abstract

The invention discloses a method, a system and a device for time synchronization in a mobile communication system. The method comprises the steps of: sending system broadcast information which contains system time information by a base station, wherein the system time information is used for being provided to a terminal which receives the system broadcast information and correcting the local time of the terminal according to the system time information, and the local time of the terminal keeps synchronization with the system time after being corrected. In the invention, the system time can be obtained and the time is synchronized by the terminal of any access system without the conditions that the terminal has a GPS function and the interaction flow of the terminal and an NTP (Network Time Protocol) server is increased or changed, the terminal reliably and easily obtains the system time and realizes time synchronization with the system time without the problem that the terminal cannot obtain the system time and cannot achieve the time synchronization with the NTP system due to the crash of the NTP system.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a time synchronization method, system and equipment in a mobile communication system. Background technique [0002] In the long-term evolution (LTE) system, discussions have begun on how to reduce the workload of operators in networking and network optimization, so the self-optimization network (self-Optimization network, SON) project and minimization drive test (minimization drive) have been introduced. test, MDT) project. [0003] The idea of ​​MDT in LTE is that the terminal (UE) reports relevant measurement information, or records the failure event corresponding to the failure and then reports it to the network side. When recording measurement information and failure events, the UE also needs to save the time at this time, and then carry it together to assist the network in network optimization. [0004] Current UE measurement quantities include: Peri...

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Problems solved by technology

[0015] First: GPS is not a necessary requirement for UE, and UE without GPS function cannot use GPS method to calibrate time;

[0016] Second: Even if the UE has the GPS function, there is no guarantee that the UE will be able to receive the time signal on the GPS. For example, it is difficult for the UE to receive satellite signals indoors.

[0018] Due to the new interaction link between the terminal and the network, it is necessary to formulate a complete process for the interaction between the terminal and the NTP server; the Network Time Protocol (NTP) server will also be oriented to the terminal on the basis of meeting the time synchronization requirements of the network side. Due to the large number of terminals , if a large number of terminals need to communicate with the server frequently, the impact on the server will be great. If too many users and network testing devices (such as base stations) are required to access at the same time, the NTP system may even collapse; the scalability is weak, If a non-NTP server is used to provide time information, the terminal and the corresponding process need to be modified; the robustness is poor, and the reliability of the time server will become the bottleneck of the reliability of the entire network. Once the server crashes due to the increase in the number of users, Then other network testing devices cannot get time synchronization

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