Dynamic VoLTE Allocation for Cell Edge QoS Optimization
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Solution Overview
Problem
Existing VoLTE systems face challenges in optimizing voice over LTE (VoLTE) quality of service (QoS) for users at the cell edge, particularly in managing bit rate recommendations to enhance voice session mean opinion score (MOS) and VoLTE range, where existing methods like TTI bundling and RLC segmentation have limitations.
Innovation Solution
The Dynamic VoLTE Allocation algorithm is used to determine when to increase or decrease the voice codec by analyzing downlink packets, incorporating TTI bundling and RLC segmentation to effectively trigger Access Network Bit Rate (ANBR) recommendations, allowing the eNodeB to adjust the codec accordingly without confirmation from the user equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is used to improve VoLTE QoS for cell edge users, then voice session MOS increases, but control overhead increases and device complexity increases
Solution Approach 1:
The system dynamically changes the TTI bundling parameter (enabling or disabling) based on channel conditions and user requirements. The eNodeB decides whether to apply TTI bundling by evaluating current network state, thus adapting the parameter to optimize VoLTE QoS while controlling overhead.
2Length of moving object
If RLC segmentation is used to handle packet allocation limitations, then VoLTE range increases, but processing complexity increases
Solution Approach 1:
The RLC layer segments packets into smaller units that can be allocated according to UE channel conditions. This segmentation allows the system to extend VoLTE coverage to cell edge users by breaking down large packets into manageable segments that can be transmitted under varying channel conditions.
3Reliability
If ANBR is used to dynamically adjust voice CODEC, then MOS increases, but trigger point determination complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the eNodeB monitors channel conditions and VoLTE performance metrics, then sends ANBR recommendations to the UE. The trigger points for ANBR are determined based on feedback from channel quality indicators and current VoLTE performance, allowing dynamic adaptation while managing complexity through standardized thresholds.
Data Source
AI summary
A method, system and computer readable medium for providing access network bit rate recommendation for Voice over Long Term Evolution (VoLTE) Coder Decoder (CODEC) change using dynamic VoLTE allocation is presented. In one embodiment a method includes determining, by an eNodeB, if Transmit Time Intervals (TTI) bundling is configured for a User Equipment (UE); and when TTI bundling is not configured, then sending an Access Network Bitrate Recommendation (ANBR) Medium Access Control (MAC) SE for VoLTE CODEC decrease.