Method for realizing relay switching in group calling of TD-SCDMA (time division-synchronization code division multiple access) cluster system

Abstract

The invention discloses a method for realizing relay switching in group calling of a TD-SCDMA (time division-synchronization code division multiple access) cluster system, relating to a cluster communication system; a RNC (radio network controller) determines a set where a user is positioned according to a measurement report state sent by the user, and is used for arranging a timer for the user in the set correspondingly, and determines the time of uploading a measurement report by the user according to the distance of the user and a current service base station, movement speed and movement direction; the RNC selects a candidate neighborhood and notifies UE (user equipment) to measure parameters of the candidate neighborhood and report the measurement parameters to the RNC, when the measurement parameters are lower than a switching threshold value, the switching is needed, and is carried out by distributing corresponding channels according to the condition that the user is a group-calling listener or a group-calling talker. In the method, the relay switching can be realized in the TD-SCDMA cluster system by combining an intelligent antenna.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for group call relay switching in a trunking communication system based on a TD-SCDMA (Time Division Synchronous Code Division Multiple Access) system. Background technique [0002] In the future, the trunking business will gradually develop in the direction of business broadband and business customization, enrich business types and provide more business functions, develop PushtoX (X can be in various forms such as text, voice, pictures, and video) services, and increase User-customized functions such as user priority and disaster handling make the cluster business more perfect. [0003] Currently commercially available trunking systems mainly include: TETRA, iDEN, GoTa and GT800, all of which are based on second-generation mobile communication technologies. Although they have relatively complete trunking functions and services, they are weak in supporting high-speed ...

AI Technical Summary

Problems solved by technology

[0003] Currently commercially available trunking systems mainly include: TETRA, iDEN, GoTa and GT800, all of which are based on second-generation mobile communication technologies. Although they have relatively complete trunking functions and services, they are weak in supporting high-speed multimedia services Fully adapt to the needs of future trunking communication development, with poor potential

Moreover, these four types of products still have some problems: because a large number of technical patents are in the hands of foreign manufacturers, the prices of TETRA and iDEN systems and terminal equipment are relatively high; Can be exclusively produced by Motorola; the two systems independently developed in China, GoTa and GT800, are based on CDMA and GSM technologies respectively

[0006] Currently, the relay handover technology in the TD-SCDMA system cannot be directly applied to the TD-SCDMA trunking system mainly because of the following reasons: In the cellular system, each user has its own dedicated control channel for sending uplink control information. The group call users do not have a dedicated control channel, but multiple users share a control channel. It is difficult for users to upload measurement reports in time, which makes it difficult for the system to use smart antennas and synchronization technology to implement relay handover, and the TD-SCDMA trunking group call The call method is very different from the cellular call method. The group call is a one-to-many call method, while the cellular system is a one-to-one call method. Therefore, it is necessary to carry out the implementation method of the relay handover in the TD-SCDMA trunking system. Research

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