Overload control method of urgent call and preempted preference call

Abstract

The present invention relates to an overload control method of an emergency call and a preemption and priority call. When the emergency call and the preemption and priority call of a push-to-talk group calling are accessed, a resource control module distributes the required resource according to the non overload flow, after the resource is distributed successfully, and when the power overload in the frequency is found, the resource control module calculates the threshold value of the resource number which is required to be released; other calling resources which conform to the releasing condition are searched and released; when the released resource number reaches the threshold value, the releasing is stopped. The overload control method of the present invention for both the system performance and other normal calling when the current carrier power is overloaded not only prevent too high forward power, but also avoid the waste of the system resources caused by excessive normal calling releasing.

Description

technical field [0001] The invention relates to an overload control technology for realizing emergency calls and preemption priority calls of a PTT (Push To Talk) group call service in a professional trunking system GOTA (Global open Trunking architecture). Background technique [0002] The emergency call and preemption priority call of the CDMA-based professional trunking GOTA system are a supplementary service of the PTT group call service, which realizes two calls that have higher priority than ordinary group calls and can occupy resources first. The call priority is to meet the requirement that different calls have different resource occupation capabilities. The call priority value CPV (Call Prior Value) is uniformly defined and associated with the call. A PTT call has a CPV value, and the CPVs of PTT calls can be directly compared. The smaller the CPV value, the higher the priority. [0003] 1) A preemptive priority call is a priority call. In the case of insufficie...

AI Technical Summary

Problems solved by technology

According to the processing principle of PTT group call overload control in the prior art, due to the high-speed transmission of the forward supplementary channel (FSCH), a larger transmit power is required, which may cause system overload, so the release of FSCH is given priority. However, in emergency calls and pre-emption calls, releasing the FSCH is not optimal because:

[0014] 1. When the current emergency call or pre-emption priority call is connected, it cannot be guaranteed that the FSCH must exist under the carrier;

[0015] 2. If there is a PTT enhanced group emergency call that is already in the conversation at this time, then the ordinary level call may be held, but the PTT group call will be released;

[0016] 3. If the system is configured with multiple resource boards, each resource board corresponding to the carrier fan will release FSCH, which will inevitably waste resources

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