Patent ID: 8259675
Filing Date: 2012-09-04
Classification: H04B,H04W

Abstract:
1. A method performed in a mobile station capable of processing multiple calls simultaneously in progress, the method comprising computer executable steps executed by a processor of the mobile station to implement: processing a first call and a second call being simultaneously in progress via a first branch structure assigned commonly to the first and second calls being simultaneously in progress, wherein the first branch structure includes a first branch between the mobile station and a first base station; responsive to a diversity handover request, determining whether both the first and second calls can continue simultaneously in progress via a second branch structure having a new branch not included in the first branch structure and using a single frequency band for both the first and second calls; if it is determined that both the first and second calls can continue simultaneously in progress via the second branch structure, proceeding to handover both the first and second calls from the first branch structure to the second branch structure, wherein the second branch structure is assigned commonly to the first and second calls being simultaneously in progress; and if it is determined that both the first and second call cannot continue simultaneously in progress via the second branch structure, dropping one of the first and second calls having lower priority and proceeding to handover the other of the first and second calls having higher priority from the first branch structure to the second branch structure, wherein the second branch structure includes a second branch between the mobile station and a second base station, and the second branch structure includes a second branch between the mobile station and a second base station.