Terminal Output Power Control for VoLTE Carrier Aggregation
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Solution Overview
Problem
During carrier aggregation operations in LTE networks, the average output power for each carrier is reduced, leading to potential service quality degradation, particularly near cell edges, due to optimized maximum output power design, which can cause issues like call drops during services like VoLTE.
Innovation Solution
A method and apparatus that dynamically control output power for each carrier based on the type of service, prioritizing more transmission power for the primary cell when a bearer is established for services like VoLTE, ensuring high-quality service by adjusting power allocation according to service conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal evenly distributes output power to multiple carriers during carrier aggregation, then the device complexity is reduced and operation is simplified, but the service quality deteriorates particularly near cell edges due to power shortage
Solution Approach 1:
The patent implements dynamic power allocation that adjusts power distribution based on real-time service conditions. When a voice service bearer is active, the system dynamically allocates more power to the primary cell to ensure call quality, rather than using static even distribution. This dynamic adaptation resolves the contradiction by maintaining simplicity while improving reliability under critical conditions.
Solution Approach 2:
The system changes the power allocation parameter based on service type detection. When a voice bearer is detected, the power distribution parameter is changed from equal allocation to unequal allocation favoring the primary cell. This parameter change allows the system to maintain ease of operation through automated adjustment while improving service quality through condition-based optimization.
2Area of stationary object
If the terminal uses maximum output power of 23 dBm optimized for single carrier operation, then the coverage is optimized for single carrier, but the average output power per carrier drops by 3 dB during carrier aggregation causing power shortage
Solution Approach 1:
The patent applies local quality by allocating different power levels to different carriers based on their specific roles. The primary cell receives higher power allocation when voice services are active, while secondary cells receive reduced power. This localized power optimization ensures that critical services maintain adequate power levels without requiring maximum total power, thus resolving the contradiction between coverage optimization and per-carrier power availability.
3Productivity
If the terminal allocates equal power to primary and secondary cells, then the resource allocation is simple and efficient, but call drops occur during services like VoLTE near cell edges
Solution Approach 1:
The system performs preliminary detection of voice service bearers before allocating power. When a voice service is detected, the system proactively adjusts power allocation to favor the primary cell, preventing potential call drops before they occur. This preliminary action allows the system to maintain efficient resource allocation through automated detection and response while ensuring call stability through preventive power management.
Data Source
AI summary
The present disclosure provides a method of controlling an output power of a terminal during a carrier aggregation operation and an apparatus suitable for the method. During the carrier aggregation operation, the terminal may control the power allocation such that more transmission power is allocated for the primary cell when there exists a bearer established already for a particular service such as the VoLTE service, so as to facilitate high quality services according to a service using situation of the terminal.