Uplink Coverage Boosting for VoLTE with Low Power Headroom
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Solution Overview
Problem
The existing techniques for improving voice quality in VoLTE calls, such as TTI-bundling and uplink coverage boosting (VUCB), show varying effectiveness depending on the UE's downlink receive signal strength, with combinations of these methods sometimes resulting in lower Mean Opinion Scores compared to using TTI-bundling alone.
Innovation Solution
The base station applies uplink coverage boosting (VUCB) only when both the UE's power headroom and downlink receive signal strength are below specific thresholds, optimizing the allocation of PRBs and modulation schemes to enhance voice communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink coverage boosting (VUCB) is applied to improve voice quality, then the Mean Opinion Score improves, but the complexity of resource allocation increases
Solution Approach 1:
The base station dynamically adjusts resource allocation parameters (number of PRBs, modulation scheme) based on real-time measurements of power headroom and downlink signal strength. By changing these parameters adaptively rather than using fixed allocation, the system improves voice quality while managing complexity through data-driven decisions.
Solution Approach 2:
The system implements a feedback mechanism where the base station continuously monitors power headroom reports and downlink signal strength measurements from the UE. This feedback loop enables the base station to adjust VUCB parameters in real-time, optimizing voice quality while avoiding unnecessary complexity in resource allocation by acting only when conditions warrant intervention.
2Reliability
If VUCB is applied in all coverage conditions, then voice quality improves, but the effectiveness decreases when downlink signal strength is sufficient
Solution Approach 1:
The system transitions from static to dynamic resource allocation by continuously adjusting VUCB parameters based on real-time coverage conditions. The base station dynamically determines whether to apply VUCB by comparing power headroom and downlink signal strength against thresholds, ensuring optimal effectiveness only when coverage boosting is actually needed.
Solution Approach 2:
The system applies different resource allocation strategies to different coverage conditions. Instead of uniform treatment, the base station provides tailored allocation decisions based on local measurement conditions (power headroom and signal strength), applying VUCB only when coverage is insufficient and using standard allocation when coverage is adequate.
3Measurement precision
If the base station monitors power headroom and signal strength continuously, then resource allocation accuracy improves, but the processing overhead increases
Solution Approach 1:
The system applies partial monitoring by using existing上报 (reports) from the UE rather than implementing comprehensive continuous monitoring. The base station utilizes power headroom reports and downlink signal strength measurements that are already being collected for other purposes, avoiding excessive processing overhead while maintaining sufficient measurement precision for accurate resource allocation decisions.
Data Source
AI summary
A base station will determine both that a served device's power headroom is threshold low and that the device's downlink receive signal strength is threshold low. In response to at least determining both that the device's power headroom is threshold low and that the device's downlink receive signal strength is threshold low, the base station will then begin applying an uplink coverage boosting process for the device, including limiting or reducing the number of frequency blocks that the base station allocates to the device for uplink transmission per transmission time interval, to help increase the device's per-frequency-block transmission power and thus the device's uplink communication quality. This could be usefully carried out with respect to voice over Long Term Evolution (VoLTE) uplink coverage boosting (VUCB) for instance, to help improve voice communication quality.