Inter-Cell Interference Control via Dynamic Uplink Power Adjustment
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Solution Overview
Problem
In cellular communication systems where neighboring cells operate on the same frequency band, inter-cell interference occurs, affecting uplink communications due to limited transmission power capabilities of terminal devices, and existing interference cancellation methods are insufficient in some cases.
Innovation Solution
The solution involves detecting inter-cell interference and determining the capability of interference cancellation, with access nodes controlling uplink transmit power of terminal devices on a sub-frame level by adjusting power settings to either decrease or increase transmit power based on interference cancellation capabilities, and communicating these adjustments between access nodes to optimize signal strength and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interference cancellation is used to reduce inter-cell interference, then interference strength decreases, but desired signal strength may also be reduced due to power control adjustments
Solution Approach 1:
The patent dynamically changes the uplink transmit power parameter based on interference cancellation capability. When interference cancellation is capable, the system decreases uplink transmit power to reduce interference; when interference cancellation is not capable, the system increases uplink transmit power to maintain desired signal strength. This parameter adjustment resolves the contradiction by adapting power levels to the actual interference cancellation capability of the receiver.
2Strength
If uplink transmit power is increased to maintain signal strength, then desired signal strength is improved, but inter-cell interference increases
Solution Approach 1:
The system dynamically adjusts the uplink transmit power parameter based on the receiver's interference cancellation capability. When the receiver can effectively cancel interference, the transmit power is decreased to reduce inter-cell interference. When interference cancellation capability is insufficient, transmit power is increased to maintain signal strength. This conditional parameter adjustment resolves the contradiction between signal strength and interference generation.
3Object-affected harmful factors
If interference cancellation capability is enhanced, then interference control improves, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiver determines its interference cancellation capability and communicates this information back to the transmitter. The transmitter then adjusts uplink transmit power based on this feedback. This feedback loop enables effective interference control without requiring complex interference cancellation processing at the transmitter side, thereby resolving the contradiction between interference control performance and device complexity.
Data Source
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AI summary
This document discloses s solution for inter-cell interference control in a cellular communication system. A method comprises: detecting, by an access node managing an interfered cell in a cellular communication system, inter-cell interference from an interfering cell; determining whether or not interference cancellation performed for a signal received through the access node is capable of cancelling said inter-cell interference; and controlling, on a basis of a result of said determining, uplink transmit power of a terminal device on time-frequency resources allocated to the terminal device.