IMS Codec Capability Signaling for RAN-Assisted Adaptation
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Solution Overview
Problem
Current technologies lack effective end-to-end signaling for RAN-assisted codec adaptation capabilities in IMS multimedia telephony sessions, leading to costly and undesirable frequent SDP renegotiations during access network changes.
Innovation Solution
Implement SDP and RTP/RTCP-based methods to signal ANBR capability and RAN-assisted codec adaptation capabilities, including support for radio capabilities on ANBR signaling, enabling efficient codec mode adjustments based on access network bitrate recommendations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional SDP renegotiation is used for codec adaptation during access network changes, then codec adaptation can be achieved, but frequent SDP renegotiations occur which increase signaling overhead and call disruption
Solution Approach 1:
The patent applies preliminary action by pre-negotiating and storing multiple codec profiles with different bitrates during the initial session setup. When access network changes occur, the UE can immediately switch between pre-configured codecs without initiating new SDP renegotiation, thus avoiding time loss while maintaining adaptability
Solution Approach 2:
The patent implements dynamics by enabling dynamic codec switching between pre-configured profiles based on real-time access network conditions. The system dynamically selects the appropriate codec profile without requiring dynamic SDP renegotiation, achieving both adaptability and time efficiency
2Adaptability or versatility
If SDP renegotiation is performed frequently for codec adaptation, then codec can be adjusted to match network conditions, but signaling overhead and processing complexity increase
Solution Approach 1:
Multiple codec profiles are pre-negotiated and stored during initial session setup, eliminating the need for complex repeated SDP renegotiation procedures. This preliminary action reduces signaling overhead and processing complexity while maintaining codec adaptability
Solution Approach 2:
The patent uses copying by creating multiple pre-configured codec profiles that are copies of the base codec configuration with different bitrate parameters. These copied profiles can be rapidly switched without re-negotiation, reducing complexity while maintaining adaptability
3Reliability
If access network bitrate recommendation is implemented, then end-to-end quality can be improved, but signaling infrastructure and coordination requirements increase
Solution Approach 1:
The access network bitrate recommendation serves as an intermediary that provides quality guidance to the UE. The UE uses this recommendation to select from pre-configured codec profiles, simplifying the coordination complexity while improving end-to-end quality through RAN-assisted codec adaptation
Data Source
AI summary
Provided herein are apparatus and method for signal RAN-assisted codec adaptation capabilities via IMS. An apparatus for a UE includes a RF interface to receive an SDP offer message from the remote UE, the SDP offer message including a first dedicated SDP attribute parameter to indicate support of ANBR capability of the remote UE; and processor circuitry. The processor circuitry is to decode the SDP offer message to determine the support of ANBR capability of the remote UE; encode an SDP answer message in response to the SDP offer message, the SDP answer message including a second dedicated SDP attribute parameter to indicate support of ANBR capability of the UE; and cause transmission of the SDP answer message to the remote UE. Other embodiments may also be disclosed and claimed.