Hybrid RTP Payload Format for Codec Adaptation and Low Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for introducing new speech codecs into telecommunication systems face interoperability issues with legacy equipment, leading to increased costs and potential speech quality degradation, particularly in scenarios where frame aggregation is used, and there is a need for an efficient RTP payload format that minimizes overhead while allowing for codec mode adaptation with legacy AMR-WB equipment.
Innovation Solution
A method and apparatus for defining a payload format that selectively uses a header-less or header-full RTP payload format based on codec modes and bit rates, ensuring unique identification of codec modes and bit rates, and incorporating additional signaling information for interoperability with legacy equipment using spare bits or remapping, thereby avoiding ambiguities and maintaining efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a header-full RTP payload format is used to allow frame aggregation and flexible codec modes, then adaptability and versatility are improved, but device complexity and processing overhead increase
Solution Approach 1:
The payload format is segmented into two distinct types: header-full format for frame aggregation scenarios and header-less format for single-frame scenarios. This segmentation allows the system to choose the appropriate format based on the coding mode and bit rate, reducing unnecessary processing overhead while maintaining adaptability.
Solution Approach 2:
The payload format dynamically switches between header-full and header-less modes based on the coding mode and bit rate being used. This dynamic adaptation allows the system to optimize for either flexibility (header-full) or efficiency (header-less) depending on the specific transmission requirements.
2Productivity
If a header-less RTP payload format is used to minimize overhead, then productivity is improved, but adaptability deteriorates due to inability to support frame aggregation
Solution Approach 1:
The solution segments the payload format options into header-less for high-efficiency single-frame transmission and header-full for flexible frame aggregation scenarios. This allows the system to achieve high productivity when using header-less format while retaining adaptability through the availability of header-full format when needed.
Solution Approach 2:
The system changes the payload format parameters (presence/absence of header) based on the coding mode and bit rate parameters. This parameter adaptation allows optimization of transmission efficiency for specific codec configurations while maintaining support for frame aggregation when required.
3Reliability
If legacy AMR-WB interoperable modes are included in EVS codec to ensure interoperability, then reliability is improved, but device complexity increases due to support for multiple coding formats
Solution Approach 1:
The solution extracts and separately handles the interoperability signaling information (codec mode and bit rate) from the main payload. By using dedicated spare bits or remapping existing bits to carry this signaling information, the system maintains reliability for legacy interoperability while reducing the complexity of implementing multi-mode support, as the signaling is streamlined and integrated into the existing payload structure.
Solution Approach 2:
The payload format is designed to be universal by supporting both legacy AMR-WB and new EVS coding modes through a unified structure. The same payload format can carry different codec modes by utilizing spare bits or remapped bits for signaling, allowing one format to serve multiple functions and reducing the need for separate implementation of legacy and new codec support.
4Reliability
If transcoders are provisioned in media gateways to translate between new and legacy codecs, then interoperability is improved, but loss of energy and additional equipment costs occur
Solution Approach 1:
The solution extracts the interoperability function from separate transcoder equipment and integrates it directly into the EVS codec implementation. By including AMR-WB interoperable modes as part of the EVS codec and using spare bits or remapped bits for signaling, the system eliminates the need for separate transcoder equipment, reducing network investment and maintenance costs while maintaining interoperability.
Solution Approach 2:
The solution merges the legacy AMR-WB codec functionality with the new EVS codec into a single integrated codec implementation. This combining of functions allows terminals to handle both legacy and new codec modes internally, eliminating the need for separate transcoder equipment in the network and reducing overall system complexity and cost.
Data Source
AI summary
In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for formatting a payload for transmission of multi-mode speech/audio codec data. The method comprises deciding whether a header-less or a header-full payload format is used for transmission of a coded frame. The decision is based on a codec mode and a required functionality. The payload data is packetized with or without the payload header depending on the decision.