VoLTE RTP Metrics Handover for Packet Loss Detection
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Solution Overview
Problem
Current wireless telecommunications networks using VoLTE or ViLTE protocols struggle to detect and mitigate RTP-based degradations such as packet loss and latency, as these issues are not identifiable through traditional radio signal strength and quality measurements, leading to user-perceivable degradations in audio or video quality.
Innovation Solution
Implementing RTP-based service measurements and handover criteria, where user devices collect and report RTP metrics like packet loss and latency, allowing network elements to determine if inter-frequency handovers are necessary based on these metrics, rather than relying solely on radio signal measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radio signal strength and quality measurements are used to monitor network performance, then the measurement system remains simple and easy to implement, but RTP-based degradations such as packet loss and latency cannot be detected
Solution Approach 1:
The patent segments the measurement system into two distinct components: traditional radio signal measurements (RSRP, RSRQ) performed by the wireless device, and RTP-based service measurements (packet loss, latency, jitter) collected from the packet data network. This segmentation allows each measurement type to operate independently with appropriate tools, enabling detection of RTP-based degradations without requiring complete system redesign.
Solution Approach 2:
The patent introduces an intermediary mechanism where the wireless device acts as a bridge between the radio access network and the packet data network. The device collects both radio signal measurements and RTP-based service measurements, then reports both sets of data to the network. This intermediary approach enables integrated monitoring without requiring direct complex interactions between network elements.
2Reliability
If RTP-based service measurements are implemented to detect packet loss and latency, then detection precision for RTP degradations improves, but the overall measurement and reporting complexity increases
Solution Approach 1:
The patent implements self-service by enabling the wireless device to autonomously collect and report RTP-based service measurements without requiring additional network infrastructure or manual configuration. The device uses its existing capabilities to monitor packet loss, latency, and jitter from the packet data network, then automatically reports these measurements to the network for handover decisions.
Solution Approach 2:
The patent establishes a feedback loop where RTP-based service measurements are continuously collected and reported to the network, which then uses this feedback to determine when inter-frequency handovers are necessary. This closed-loop feedback mechanism ensures reliable audio/video quality by automatically triggering handovers when RTP degradations are detected, without requiring manual intervention.
3Object-affected harmful factors
If inter-frequency handovers are performed based on RTP metrics, then user-perceivable degradations are reduced, but the frequency of handover operations increases
Solution Approach 1:
The patent applies preliminary action by continuously monitoring RTP-based service measurements and identifying degradation trends before they significantly impact user experience. The system proactively triggers inter-frequency handovers when RTP metrics indicate emerging problems, preventing severe audio/video degradations rather than reacting after quality has already deteriorated.
Solution Approach 2:
The patent changes the handover decision parameters from being solely based on radio signal strength to incorporating RTP-based service measurements such as packet loss rate, latency, and jitter. This parameter change enables the system to make more informed handover decisions that directly address the root causes of user-perceivable degradations, optimizing the balance between handover frequency and quality maintenance.
Data Source
AI summary
Systems, methods, and computer-readable media are described for delivering wireless telecommunications services using the Voice over Long Term Evolution (VoLTE) protocol, the Video over Long Term Evolution (VoLTE) protocol, and other such protocols that implement the Real-Time Transport Protocol (RTP) to deliver packet flows to mobile devices. Metrics relating to the RTP packet flow may be generated, and may be collected from a mobile device periodically or on an as-needed basis. The RTP-based metrics may be utilized to determine that an LTE inter-frequency handover should be performed. Inter-frequency handover criteria may specify thresholds for RTP metrics within an individual reporting period, or may be used to determine that an inter-frequency handover will occur if a rolling or weighted average of RTP metrics satisfies a threshold.