Session Transfer Conference Control in Wireless Networks
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Solution Overview
Problem
Existing session transfer methods fail to control conferences when a User Equipment (UE) is transferred between Circuit Switched (CS) and Packet Switched (PS) domains, leading to uncontrolled conferences.
Innovation Solution
A session transfer method that determines if a UE has sessions belonging to a conference during transfer and sends relevant conference information to the UE or a Mobile Switching Center (MSC) server, allowing for conference control by establishing a conference state using the obtained information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If session transfer is performed using the prior art method, then session transfer between CS and PS domains is achieved, but conference control capability is lost in the target network
Solution Approach 1:
The patent applies preliminary action by determining whether the UE has conference sessions before performing session transfer, and by forwarding conference control information to the target network in advance. This ensures that the target network (MSC server) receives necessary conference control information before the UE actually transfers, enabling immediate conference control capability restoration without loss of functionality.
2Reliability
If conference control information is forwarded to MSC server, then conference control capability is maintained, but signaling complexity increases
Solution Approach 1:
The patent extracts only the necessary conference control information (conference URI, conference state, participant information) from the complex session transfer signaling and forwards it separately to the MSC server. This extraction approach maintains conference control capability while minimizing the addition of signaling complexity, as only essential conference-related parameters are transmitted rather than complete session details.
Data Source
AI summary
The present invention discloses a session transfer method, a device and a system, which relate to the communication field and are used to solve the problem that a conference to which a session belongs cannot be controlled after the session is transferred. The technical solution provided in the present invention includes: determining whether a User Equipment (UE) has at least one session belonging to a conference during a process that a session of the UE is transferred from a source network to a target network and sending information relevant to the conference to the UE or a Mobile Switching Center (MSC) server if the UE has at least one session belonging to the conference (102). The embodiments of the present invention can be applied in a wireless communication network.