Uplink Power Control in HetNet via Multi-Base Station Signal Quality Feedback
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Solution Overview
Problem
In the LTE-A system, conventional transmission power control methods are not suitable for HetNet environments, leading to inadequate uplink transmission power control and insufficient suppression of inter-cell interference, which results in lower uplink communication quality.
Innovation Solution
A radio communication system and method that involves a first and second radio base station apparatus communicating to measure and report uplink reference signal quality, allowing for the determination and reporting of a correction value for the user terminal's transmission power, enabling accurate uplink transmission power control by estimating propagation loss through different methods, such as using the received level of reference signals at each base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional transmission power control methods are used in HetNet environments, then the system maintains backward compatibility with LTE, but uplink transmission power control becomes inadequate and inter-cell interference suppression is insufficient
Solution Approach 1:
The patent applies local quality by having different base stations (serving and non-serving) perform different measurement functions. The serving base station measures signal strength for local power control, while non-serving base stations measure signal strength for external power control suggestions. This differentiated local measurement approach enables accurate power control adaptation to HetNet environments while maintaining LTE compatibility.
Solution Approach 2:
The patent implements feedback mechanisms where signal strength measurements from both serving and non-serving base stations are fed back to compute power control suggestions. The external power control suggestions from non-serving base stations are communicated through inter-base station networks to the serving base station, which then combines them with local suggestions to generate accurate power control commands for uplink transmission.
2Object-affected harmful factors
If fractional transmission power control is employed to take inter-cell interference into account, then interference consideration is improved, but propagation loss measurement accuracy deteriorates due to insufficient consideration of non-serving base station conditions
Solution Approach 1:
The patent merges local power control suggestions from the serving base station with external power control suggestions from non-serving base stations. By combining these multiple measurement results through the inter-base station network, the system achieves both inter-cell interference consideration and accurate propagation loss measurement, resolving the contradiction between interference management and measurement precision.
Data Source
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AI summary
The present invention is designed to provide a radio communication system which can control uplink transmission power adequately even in an HetNet environment. A radio communication system having a first radio base station apparatus and a second radio base station apparatus that is configured to able to communicate with the first radio base station apparatus is provided, and, in this radio communication system, the first radio base station apparatus has a first communication quality measurement section that measures the received quality of an uplink reference signal transmitted from a user terminal, and generates first received quality information, and a reporting section that reports the first communication quality information to the second radio base station apparatus, and the second radio base station apparatus has a second communication quality measurement section that measures the received quality of the uplink reference signal transmitted from the user terminal, and generates second communication quality information, a correction value determining section that determines a correction value for the transmission power of the user terminal on the uplink based on the first communication quality information and the second communication quality information, and a reporting section that reports the determined correction value to the user terminal.