IMS Media Codec Negotiation via Pre-configured Gateway
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current IMS media codec negotiation methods require an extra interaction of media resource requests and responses, leading to increased signaling overhead and a delay before a call is fully established.
Innovation Solution
The proposed method involves a first signaling media network element carrying the media address and codec information of a second media gateway controlled by it, used for code transition, and taking this gateway as a node in the media path upon receiving a media resource response, thereby reducing the need for additional signaling interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network element performs code transition function by negotiating codec information with the remote terminal, then media data interaction between UEs supporting different codecs is enabled, but an extra interaction of media resource requests and responses is required, increasing signaling overhead
Solution Approach 1:
The network element pre-configures the media gateway with codec information before the actual media negotiation. The media gateway is pre-loaded with supported codec lists and transformation rules, so when a call requires code transition, the necessary transformation capabilities are already in place and can be activated immediately without requiring additional negotiation interactions.
Solution Approach 2:
The media gateway acts as an intermediary that handles codec transformation independently. Instead of requiring continuous negotiation between UEs, the media gateway receives media streams in one codec and automatically transforms them to the required codec, serving as a mediator that resolves codec incompatibility without additional signaling overhead.
2Reliability
If the network element performs code transition function through multiple signaling interactions, then codec information is properly exchanged, but a delay before call establishment occurs
Solution Approach 1:
The network element performs codec negotiation and media gateway selection in advance during call setup, before the actual media transmission begins. The media gateway is pre-configured with the required codec transformation capabilities, so when media flow starts, the transformation can begin immediately without delay.
Solution Approach 2:
The code transition function is established continuously and maintains active transformation capabilities throughout the call. Once the media gateway is configured with the necessary codec information, it continuously prepares to perform transformations without interruption, ensuring seamless media flow without additional negotiation delays during the call.
3Measurement precision
If the media gateway is configured with codec information from multiple interactions, then accurate codec selection is achieved, but the signaling process becomes more complex
Solution Approach 1:
The network element performs codec capability exchange and media gateway selection in a single initial interaction, pre-configuring the media gateway with all necessary codec information before media transmission begins. This eliminates the need for multiple subsequent negotiation interactions while maintaining accurate codec selection.
Solution Approach 2:
The media gateway is designed with multi-functional capabilities, supporting multiple codecs and transformation types simultaneously. A single configuration interaction provides the gateway with comprehensive codec information, allowing it to handle various codec combinations and transformation requirements without requiring multiple specialized signaling interactions.
Data Source
AI summary
The present disclosure provides an IMS media codec negotiation method, which is used in an IMS network. The method comprises: when forwarding a media resource request, a first signaling media network element carries a media address of a second media gateway and a codec supported by the second media gateway into the media resource request, wherein the second media gateway is controlled by the first signaling media network element and is used for code transition; when receiving a media resource response, the first signaling media network element takes the second media gateway as a node of a media path in the case that the media resource response information related to the second media gateway. An IMS media codec negotiation system is also provided by the present disclosure. The method and system mentioned in the present disclosure can realize media codec negotiation via interaction of the media resource request and response for only one time, therefore, the signaling overhead is reduced, and the user experience is improved.