Patent ID: 8942183
Filing Date: 2015-01-27
Classification: H04W

Abstract:
1. A method for assigning carrier frequency, comprising: after a base station subsystem has received a group call request, assigning, in a trunking system, one reference carrier frequency to the group call and establishing forward channels of all group members, of which each corresponds to one forward channel, managed by the base station subsystem at the reference carrier frequency, so that the forward channels of all group members can be considered as being combined into one forward channel to realize a wireless channel sharing mechanism; wherein the group call is processed by a plurality of main processors (MPs), the base station subsystem assigns a master main processor (Master MP) to the group, and other MPs work as slave main processors (Slave MPs); and wherein when the base station subsystem receives the group call request, the following steps are performed: (a) the base substation system selecting a MP and sending the group call request to the selected MP, performing step (b) if the selected MP is a Master MP; performing step (c) if the selected MP is a Slave MP; (b) after the Master MP having received the group call request, determining whether the reference carrier frequency of the group call exists, if yes, the step (b) ends; otherwise, assigning the reference carrier frequency to the group call and announcing it to all the Slave MPs, the Slave MPs determining or updating a local reference carrier frequency after receiving the reference carrier frequency; (c) after the Slave MP having received the group call request, determining whether the reference carrier frequency of the group call exists, if yes, the step (c) ends; otherwise, notifying the Master MP, then the Master MP determining the reference carrier frequency of the group call and announcing it to all the Slave MPs through a message, the Slave MPs determining or updating the local reference carrier frequency according to the reference carrier frequency in the message after having received the message.