Uplink Power Control Using Interference-Aware Beam Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in uplink power control, particularly when using beamforming and spatial/space division multiple access (SDMA), as existing methods do not accurately account for interference between beams, leading to reduced transmission performance and increased interference.
Innovation Solution
A method and apparatus that determine uplink transmission power based on interference values and neighboring reception beam allocation information, using power control variables calculated considering the angle of reception beams to optimize power control and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming and SDMA are used to increase transmission capacity, then data transmission rate is improved, but uplink power control accuracy deteriorates due to lack of suitable power control methods
Solution Approach 1:
The patent changes the power control parameters by introducing a power control variable that specifically accounts for interference from neighboring reception beams. This variable adjusts the uplink transmission power based on the interference situation caused by SDMA and beamforming, thereby maintaining power control accuracy while enabling higher transmission capacity through multiple beams.
2Productivity
If multiple reception beams are used for SDMA, then transmission capacity is improved, but inner cell interference increases due to beam interference
Solution Approach 1:
The patent implements a feedback mechanism where the base station calculates a power control variable based on the interference situation from neighboring reception beams and feeds this information back to the mobile terminal. The mobile terminal then adjusts its uplink transmission power accordingly, creating a closed-loop system that dynamically compensates for inner cell interference while maintaining high transmission capacity through multiple beams.
3Device complexity
If conventional uplink power control method is used, then device complexity is low, but transmission performance deteriorates due to inaccurate interference consideration
Solution Approach 1:
The patent applies preliminary action by having the base station pre-calculate the power control variable based on the interference situation from neighboring reception beams before the mobile terminal transmits. This advance calculation and feedback of interference information allows the mobile terminal to adjust its transmission power proactively, improving transmission performance without requiring complex real-time interference calculation at the terminal side.
Data Source
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AI summary
In a wireless communication system, a first mobile terminal: receives, from a base station, a power control variable determined on the basis of an interference value for a first receive beam used in order to receive an uplink signal of the first mobile terminal from among a plurality of receive beams of the base station; receives, from the base station, neighboring receive beam allocation data indicating whether any of the receive beams in the plurality of receive beams, apart from the first receive beam, is being used for uplink signal reception; determines an uplink send power value based on the received power control variable and neighboring receive beam allocation data; and sends an uplink signal to the base station by using the determined uplink send power value.