Codec-Specific Radio Link Adaptation for EVS Performance
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Solution Overview
Problem
Current cellular networks fail to fully realize the performance improvements offered by new audio codecs like EVS, as the radio access network is unable to differentiate between EVS and legacy codecs such as AMR, leading to suboptimal radio control parameters being used for all speech data, which limits the benefits of newer technologies.
Innovation Solution
Implementing a codec-specific radio link adaptation procedure that dynamically adjusts radio control parameters based on the codec employed by mobile devices, using packet inspection or notification messages to determine the codec and adapt the radio link accordingly, allowing for the use of enhanced settings when EVS is detected and default settings for legacy codecs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RAN uses codec-agnostic radio control parameters for all bitstreams, then the system maintains simplicity and universal compatibility, but the performance improvements of new codecs like EVS are not fully realized
Solution Approach 1:
The patent applies the principle of 'color changes' by using different radio control parameter sets for different codec types. The RAN identifies the codec type (EVS vs. legacy) and applies codec-specific parameters, analogous to using different colors for different purposes. This allows the system to optimize performance for each codec type while maintaining a manageable level of complexity through structured parameter management.
Solution Approach 2:
The patent directly implements 'parameter changes' by dynamically adjusting radio control parameters based on the detected codec type. When EVS codec is detected, EVS-optimized parameters are applied; when legacy codecs are detected, traditional parameters are used. This enables the RAN to adapt to different codec requirements and fully utilize the performance capabilities of new codecs without requiring complete system redesign.
2Reliability
If the RAN implements codec-specific radio control parameters, then the performance of new codecs like EVS is fully realized, but the system complexity increases
Solution Approach 1:
The patent applies 'Preliminary action' by pre-defining codec-specific radio control parameter sets before runtime. The RAN prepares multiple parameter configurations in advance (EVS-optimized parameters, legacy codec parameters) and selects the appropriate pre-prepared set based on codec detection. This approach reduces runtime complexity while ensuring optimal parameters are applied, thereby improving voice communication reliability without excessive system complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the RAN continuously monitors incoming bitstreams, identifies the codec type, and adjusts radio control parameters accordingly. This closed-loop feedback system ensures that the correct parameters are applied to maintain reliable voice communication. The feedback principle allows the system to adapt to changing conditions while maintaining manageable complexity through automated detection and adjustment.
3Measurement precision
If the RAN inspects packets to determine codec type, then accurate codec identification is achieved, but the processing overhead increases
Solution Approach 1:
The patent applies 'Partial or excessive action' by implementing packet inspection that checks only the necessary portions of packets to identify codec type. Rather than analyzing entire packets or using overly complex inspection algorithms, the system performs targeted inspections of key packet fields (such as payload type indicators) to achieve sufficient codec identification accuracy. This balances inspection thoroughness with processing efficiency.
Data Source
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AI summary
A codec-specific radio link adaptation procedure can be implemented at the radio access network (RAN) level. A process includes receiving, from a mobile device, a bitstream carrying speech data as part of a communication session, determining, based at least in part on a result of inspecting packets of the bitstream or a notification message from an Internet Protocol (IP) Multimedia Subsystem (IMS) core, that the bitstream is associated with a codec that provides improved performance of the mobile device as compared to legacy codecs in similar radio conditions; and adapting a radio link for the communication session according to the codec.