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Method for Optimal Dispatch Session Switching Disclosure Number: IPCOM000034105D
Original Publication Date: 2005-Jan-14
Included in the Prior Art Database: 2005-Jan-14

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A dispatch session switch may be triggered by either the network itself when it offers a newly received call to a busy dispatch user or by the dispatch user when he requests a new session while already active in an ongoing dispatch session. The subsequent session requested may be a dispatch call, say a Push-to-talk or Push-to-view group dispatch call through the dispatch network, or a traditional non-dispatch call like a normal voice/video call through the interconnect network. This paper discusses a mechanism to optimize the switching process from a dispatch to a dispatch or non-dispatch session so as to minimize the media non-participation time of the user during the period when switching is being performed. And for scenarios when the second session may fail due to some reasons, the method suggests how to keep the first dispatch session media participation of the user unaffected and uninterrupted. Since the solution can be placed on the User handheld device itself or the network which the user is attached to, the paper will discuss the switching mechanism from the perspective of network controlled and Mobile Station controlled Session Switching.