Switching method for mobile communication system

Abstract

This invention discloses a switching method in mobile communication system, which is suitable for a synchronous system, including: A, calculating a timing advance of a target base station when the terminal receives the switching command information from a source base station; B, the terminal sends a channel quality indication and resource request to the target base station and the target base station returns a resource authorization to terminal; C, the terminal sends the switching confirmation information to the target base station, then the switching is finished. The method adopting this invention is capable of reducing the time from the source base station to the target base station in the switching process so as to enable the terminal to quickly finish the synchronization with the target base station and without reducing the success rates of the other random access process.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to a handover method in the mobile communication system. Background technique [0002] like figure 1 As shown, the distributed cellular wireless communication system is mainly composed of terminals, base stations and core networks. There can be logical or physical connections between base stations as needed. The network composed of base stations is called a radio access network (Radio Access Network, RAN), which is responsible for access layer affairs, such as the management of wireless resources; The mode of the base station is responsible for scheduling. Each base station can be connected to one or more core network nodes (CN), and the core network is responsible for non-access stratum affairs, such as mobility management. A terminal refers to a device that can communicate with the network, such as a mobile phone or a laptop. Each terminal can only connect to one of the...

AI Technical Summary

Problems solved by technology

[0013] To sum up, in a network that schedules synchronous uplink and downlink wireless resources according to the shared channel method, in the handover process of the prior art, the following two situations may introduce time delay: 1. During the random access process between the terminal and the target base station , after the terminal receives the handover command, it may not be able to initiate the random access process immediately, but needs to wait until the opportunity to send the preamble; 2. The "start time" set in the handover command from the base station to the terminal may be unreasonable, resulting in time delay

In addition, assigning a dedicated preamble to the handover process will inevitably affect the success rate of other random access processes

Images