VoLTE Delay Budget Coordination via RTCP Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in coordinating delay and jitter management between user equipment (UEs) in VoLTE calls, leading to suboptimal voice and video quality due to lack of end-to-end coordination in delay budget reporting and packet loss ratio management.
Innovation Solution
The implementation of new RRC signaling, RTCP feedback messages, and RTP header extensions for delay budget and packet loss ratio signaling allows UEs to report and adjust air interface delays and packet loss thresholds, enabling more effective coordination between UEs and base stations to enhance VoLTE call quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UEs independently manage delay budgets without end-to-end coordination, then each UE can locally optimize its delay management, but overall VoLTE call quality deteriorates due to lack of coordination between UEs and base stations
Solution Approach 1:
The patent implements RTCP feedback messages that carry delay budget information from receiving UEs back to transmitting UEs. This feedback mechanism enables end-to-end coordination by allowing each UE to report its experienced delay and packet loss conditions, which then informs delay budget adjustments at the base station and transmitting UE, resolving the contradiction between local optimization and overall quality
Solution Approach 2:
The patent extends RTCP feedback messages to serve multiple functions: they carry not only packet loss ratio information but also delay budget information and enable coordinated delay management across the entire VoLTE call path. This multi-functionality allows a single feedback mechanism to address both local and end-to-end quality requirements
2Reliability
If packet loss ratio is increased to improve robustness, then voice and video quality improves under degraded conditions, but end-to-end coordination becomes more difficult and call continuity is compromised
Solution Approach 1:
The patent dynamically adjusts packet loss ratios and delay budgets based on real-time radio conditions and RTCP feedback. Rather than using fixed thresholds, the system continuously monitors packet loss, delay, and jitter, then adapts the packet loss ratio and delay budget parameters accordingly. This dynamic adjustment allows the system to maintain robustness while preserving end-to-end coordination capability
Solution Approach 2:
The patent changes key parameters including packet loss ratio thresholds, delay budget values, and RTCP feedback intervals based on current network conditions. By dynamically modifying these parameters rather than using static configurations, the system can optimize robustness under degraded conditions while maintaining coordination effectiveness
3Reliability
If delay budget is increased to reduce packet loss, then voice and video quality improves, but call robustness deteriorates due to inability to respond to degraded radio conditions
Solution Approach 1:
The patent performs preliminary actions by continuously monitoring radio conditions and proactively adjusting delay budgets before significant packet loss occurs. The system uses RTCP feedback to detect deteriorating conditions early and preemptively reduces delay budgets or triggers handovers, preventing robustness degradation rather than reacting after quality has compromised
Solution Approach 2:
The patent enables the VoLTE call to self-manage its own robustness by using RTCP feedback to automatically detect degraded radio conditions and trigger appropriate responses such as delay budget adjustments or handovers. This self-service capability eliminates the need for external intervention while maintaining both quality and adaptability
4Reliability
If RTCP feedback messages are implemented for delay budget signaling, then end-to-end coordination improves, but message processing complexity increases at UE and base station
Solution Approach 1:
The patent makes RTCP feedback messages multi-functional by having them carry both packet loss ratio information and delay budget information in a single message structure. This universality reduces the number of separate processing steps needed, as the base station and UEs process one consolidated feedback message rather than multiple separate signals, thereby limiting the increase in processing complexity
Data Source
AI summary
Apparatuses of user equipment (UEs) for end-to-end coordination of voice over cellular data network communications. An apparatus of a UE includes one or more data storage devices and one or more processors. The one or more data storage devices are configured to store delay budget information pertaining to end-to-end delivery of a real-time transport protocol (RTP) stream sent from a remote UE to the UE. The one or more processors are configured to generate an application layer message including the delay budget information, the application layer message to be transmitted to the remote UE to enable the remote UE to request, from a cellular base station servicing the remote UE, additional air interface delay based on the delay budget information.