Application Server Call Control for Multi-UE Session Transfer
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Solution Overview
Problem
Current multimedia session call transfer methods are inefficient and time-consuming due to the need for disconnecting and reconstructing sessions between multiple User Equipments (UEs) and peers, resulting in complex signaling flows and prolonged processing times.
Innovation Solution
A multimedia session call control method that reuses existing call legs by having a master UE establish a session with a third party under the control of an Application Server (AS), which binds call legs between slave UEs and the AS to the session with the third party, simplifying the call transfer process and reducing the need for session reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional call transfer methods are used to enable session transfer between multiple UEs, then call transfer functionality is achieved, but the signaling flow becomes complex and call transfer time is prolonged
Solution Approach 1:
The patent segments the call transfer process into independent parallel operations. Instead of sequentially disconnecting and reconstructing sessions, the system divides the transfer into concurrent signaling operations where multiple UEs can be transferred simultaneously through parallel SIP REFER message exchanges, reducing overall transfer time and complexity
Solution Approach 2:
The patent performs preliminary actions by pre-establishing signaling paths and preparing transfer resources before actual call transfer is needed. The system pre-configures the AS to handle multiple UE sessions and pre-sets up the signaling framework, so that when transfer is triggered, the operations can execute rapidly without sequential delays
2Reliability
If session disconnection and reconstruction is performed for call transfer, then session continuity is maintained, but the signaling flow becomes complex and processing time increases
Solution Approach 1:
The patent introduces an Application Server (AS) as an intermediary to manage call transfers between multiple UEs. The AS receives SIP REFER messages from the first UE, processes the transfer logic centrally, and coordinates the session continuity without requiring complex peer-to-peer signaling between multiple UEs, thereby simplifying the overall signaling flow while maintaining reliability
Solution Approach 2:
Instead of having UEs directly manage complex session disconnection and reconstruction sequences, the patent inverts the control model by having the AS manage the session continuity. The AS receives transfer requests and orchestrates the session maintenance, reversing the traditional approach where endpoint UEs would directly handle the complex signaling sequences
3Adaptability or versatility
If multiple UEs are integrated into a multi-UE party for call transfer, then call transfer functionality is enabled, but the existing call legs must be disconnected and reconstructed, reducing processing efficiency
Solution Approach 1:
The patent implements multi-functionality by enabling the AS to handle multiple UE sessions simultaneously through a universal transfer mechanism. The AS can process transfers involving multiple UEs in parallel using the same SIP REFER framework, allowing the system to adapt to various multi-UE scenarios without requiring separate processing paths for each configuration
Solution Approach 2:
The patent maintains continuity of useful action by keeping existing call legs active during the transfer process. Instead of disconnecting and reconstructing sessions, the AS orchestrates continuous session maintenance where call legs remain operational throughout the transfer, ensuring uninterrupted service and improving processing efficiency through seamless transitions
Data Source
AI summary
A multimedia session call control method and an Application Server (AS). The multimedia session call control method includes these steps: a multi-UE party performs a multimedia session with a peer under control of an AS; a master UE of the multi-UE party establishes a session with a third party under control of the AS; and the AS binds a call leg between a slave UE of the multi-UE party and the AS to the session established with the third party.