PLR Threshold Configuration for VoLTE Voice Quality
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Solution Overview
Problem
Current wireless communication networks face challenges in maintaining consistent and predictable voice quality over LTE (VoLTE) connections, particularly in areas with weak LTE coverage, due to inadequate communication of codec configurations, leading to unnecessary handovers to 2G/3G networks and suboptimal user experience.
Innovation Solution
The implementation of a mechanism to configure packet loss rate (PLR) thresholds for various codecs and codec modes within the network, allowing for adaptive adjustments based on network conditions, such as the Open Mobile Alliance (OMA)-Device Management (DM) protocol, to optimize codec configurations and handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet loss rate thresholds are not configured for various codecs, then network simplicity is maintained, but voice quality consistency deteriorates and unnecessary handovers occur
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting packet loss rate thresholds based on codec type and network conditions. Different thresholds are configured for different codecs (e.g., AMR, EVS, AWB) and adaptation triggers are defined, allowing the system to optimize voice quality by changing these parameters adaptively rather than using fixed values, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The system implements feedback mechanisms where the UE reports packet loss rates and the network uses this information to trigger codec adaptations. The network node receives measurements, compares them against configured thresholds, and initiates adaptation procedures accordingly. This feedback loop enables reliable voice quality maintenance while keeping the configuration manageable through automated decision-making.
2Reliability
If codec configurations are not communicated effectively, then network operation simplicity is maintained, but handover decisions become suboptimal and voice quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring packet loss rate thresholds and adaptation triggers in the network node before actual handover decisions are needed. The UE is also pre-configured with codec capabilities and preferred codecs. This preliminary setup ensures that when packet loss occurs, the system has ready-to-execute adaptation plans, improving handover decision quality without requiring complex real-time negotiations that would lose information.
Solution Approach 2:
The patent uses packet loss rate measurements and configured thresholds as intermediaries to bridge the gap between network conditions and codec selection decisions. Instead of directly complex codec negotiation, the system uses these intermediate parameters (PLR thresholds, adaptation triggers) to mediate the decision-making process, ensuring codec configuration information is effectively communicated and acted upon during handovers.
3Reliability
If adaptive rate adjustments are not implemented, then system simplicity is maintained, but packet loss handling becomes insufficient and voice quality varies
Solution Approach 1:
The patent applies dynamics by implementing adaptive rate adjustments that change based on real-time packet loss conditions. The system dynamically switches between different adaptation triggers (e.g., trigger 1 for PLR > threshold1, trigger 2 for PLR > threshold2) and adjusts codec parameters accordingly. This dynamic behavior enables robust packet loss handling while managing complexity through structured, condition-based adaptation rather than complex continuous optimization.
Data Source
AI summary
Disclosed are methods, systems, apparatus, and computer programs for configuring packet loss rate (PLR) thresholds for UEs in a wireless communications network. In one aspect, a method includes receiving, by a UE connected to a wireless communications network, a packet loss rate (PLR) threshold configuration message from a node in the wireless communications network; determining, by the UE and based on the PLR threshold configuration message, a new PLR threshold configuration; and in response to determining the new PLR threshold configuration, selectively adjusting one or more configuration settings associated with a connection to the wireless communications network based on the new PLR threshold configuration.