Codec Parameter Adjustment for VoLTE RF Link Reliability
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Solution Overview
Problem
In VoLTE networks, the selection of codec rates does not consider radio frequency (RF) conditions, leading to unreliable RF links and call/session drops due to the base station's inability to maintain sufficient modulation coding schemes and transport block sizes for the highest supported codec rates.
Innovation Solution
The wireless network adjusts codec parameters based on RF conditions at call/session endpoints, optimizing bit rates and informing base stations to adjust modulation coding schemes and transport block sizes for improved RF link reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the highest codec rate supported by both endpoint devices is selected, then voice and data capacity is maximized, but RF link reliability deteriorates under poor RF conditions
Solution Approach 1:
The system dynamically adjusts codec parameters based on real-time RF conditions. The base station monitors RF link quality and dynamically modifies codec bit rates, transport block sizes, and modulation coding schemes to maintain optimal performance under varying channel conditions, resolving the contradiction between maximizing capacity and ensuring reliability.
Solution Approach 2:
The invention changes multiple parameters simultaneously including codec bit rate, transport block size, and modulation coding scheme. By adjusting these parameters based on RF conditions, the system can maintain high voice and data capacity when RF conditions are good while ensuring reliable communication when RF conditions deteriorate.
2Loss of energy
If the highest codec rate is selected without considering RF conditions, then bandwidth usage is optimized, but call/session drops increase due to insufficient modulation coding schemes
Solution Approach 1:
The base station implements a feedback mechanism that continuously monitors RF link quality and communicates channel state information to adjust codec parameters. This feedback loop ensures that bandwidth is used efficiently when conditions permit while preventing call/session drops by adjusting parameters when RF conditions deteriorate.
Solution Approach 2:
The system performs preliminary assessment of RF conditions before finalizing codec parameter selection. By evaluating channel quality in advance and pre-adjusting parameters such as transport block size and modulation coding scheme, the system prevents call/session drops before they occur while maintaining bandwidth efficiency.
3Reliability
If codec parameters are adjusted based on RF conditions, then RF link reliability is improved, but system complexity increases due to additional parameter management
Solution Approach 1:
The base station performs self-service by autonomously monitoring RF conditions and adjusting codec parameters without requiring complex external control mechanisms. The system uses built-in channel quality indicators and automatically modifies parameters, reducing the need for additional complexity in parameter management while maintaining high reliability.
Data Source
AI summary
A network device determines radio frequency (RF) conditions at a first endpoint and a second endpoint of a call or session. The network device determines optimum first codec parameters for the determined RF conditions at the first endpoint of the call or session, and determines optimum second codec parameters for the determined RF conditions at the second endpoint of the call or session. The network device sends the first codec parameters to the first endpoint for altering operation of a first codec at a first device at the first endpoint. The network device sends the second codec parameters to the second endpoint for altering operation of a second codec at a second device at the second endpoint.