Terminal Packet Loss Rate Reporting for VoIP Handover Quality
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Solution Overview
Problem
In VoIP services, the current SRVCC handover technology determines handovers based solely on radio access network quality without considering codec robustness, leading to potential deterioration of call quality by switching calls to networks with lower quality.
Innovation Solution
A terminal apparatus and base station apparatus that include a packet loss rate reporting mechanism, where the terminal apparatus configures and transmits packet loss rate reports to the base station, allowing for informed handover decisions considering codec-specific packet loss rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SRVCC handover is determined based solely on radio access network quality, then handover decision simplicity is improved, but call quality deteriorates due to unnecessary handovers to networks with lower quality
Solution Approach 1:
The patent implements a feedback mechanism where the terminal measures packet loss rates in the current radio access network and reports this information to the base station. The base station uses this feedback to make informed handover decisions, comparing the current packet loss rate against thresholds to determine whether SRVCC handover is necessary. This feedback loop prevents unnecessary handovers while maintaining simple base station logic.
Solution Approach 2:
The terminal apparatus autonomously performs packet loss rate measurements and generates reports without requiring complex base station processing. The terminal self-manages the measurement, reporting, and initial evaluation of handover conditions, freeing the base station to make decisions based on simplified criteria while ensuring high call quality through accurate terminal-side measurements.
2Reliability
If packet loss rate measurement and reporting is implemented, then call quality is maintained by preventing unnecessary handovers, but protocol processing complexity increases
Solution Approach 1:
The patent segments the handover decision-making process into distinct functional parts: the terminal handles measurement and reporting, while the base station handles decision logic. This segmentation allows each component to perform its function with simple, focused processing, reducing overall protocol complexity while maintaining call quality through coordinated operation.
3Reliability
If codec robustness characteristics are considered in handover decisions, then call quality is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent uses packet loss rate as an intermediary metric that indirectly reflects codec robustness characteristics without requiring direct measurement of codec properties. The terminal measures packet loss rates in the current network, which serves as a proxy for assessing whether the codec can maintain quality under current conditions. This intermediary approach simplifies measurement while still enabling quality-aware handover decisions.
Data Source
AI summary
Provided is a technology related to a terminal apparatus, a base station apparatus, a method, and an integrated circuit capable of reducing complexity of protocol processing, reducing deterioration of phone call quality, and efficiently performing communication. A terminal apparatus for communicating with a base station apparatus includes: a reception unit configured to receive an RRC message from the base station apparatus; and a processing unit configured to configure a packet loss prohibit timer according to a packet loss rate report prohibit timer field included in the RRC message and configured to, based on reception of a report of a packet loss rate from a higher layer and a fact that a packet loss rate report prohibit timer is not running, create a packet loss rate report content, start the packet loss rate report prohibit timer, and perform transmission to the base station apparatus. The packet loss rate report content includes information of a direction for indicating whether the direction is an uplink direction or a downlink direction, and information of the packet loss rate.