Signaling Gateway Optimized Media Path Call Establishment
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Solution Overview
Problem
The existing method for establishing an optimized media path in IMS networks delays the completion time of SDP requests and responses, affecting call establishment time.
Innovation Solution
A method that includes signaling gateways with switch-out and switch-in modules to actively initiate optimized media paths by including indication information in SDP responses and requests, allowing for the establishment and release of media path resources to shorten call establishment time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the existing method for establishing optimized media path is used, then media path optimization is achieved, but call establishment time increases due to delayed SDP request and response completion
Solution Approach 1:
The patent applies preliminary action by having the first ALG proactively send an indication message to the second ALG before the SDP request-response cycle completes. This indication message pre-notifies the second ALG about the optimized media path, allowing the second ALG to prepare and send its SDP response earlier than the conventional waiting period, thus reducing overall call establishment time while maintaining SDP negotiation completeness
2Loss of time
If ALGs wait for SDP request-response completion before establishing optimized media path, then protocol correctness is maintained, but call establishment time increases
Solution Approach 1:
The patent introduces an intermediary indication message between the first ALG and second ALG. This indication message acts as a mediator that carries path optimization information without replacing the formal SDP request-response protocol. The second ALG uses this intermediary information to accelerate response while the original SDP protocol completeness is preserved, thus maintaining reliability while reducing time
Data Source
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AI summary
Provided are a method and signaling gateway for establishing an optimized media path applied in an IMS network. The method includes: during the process of forwarding a session description protocol (SDP) request and response, when receiving a SDP response of a first session, a first ALG judging that there is an optimized media path between itself and a second ALG, then when sending the SDP response of the first session, including indication information in the send SDP response; the first ALG sending a SDP request with the target being the second ALG; and after having received the SDP response of the first session including the indication information or after having received the SDP request with the target being the second ALG and the SDP response of the first session including the indication information, the second ALG sending the SDP response of the first session.