Network Device Power Control Using Interference Rejection Gain
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Solution Overview
Problem
Conventional wireless communication systems face challenges in efficiently managing transmit power of terminal devices to minimize intra-cell and inter-cell interference while adhering to established standards, often leading to unnecessary power emission and interference.
Innovation Solution
A network device determines a gain associated with a received signal using interference rejection combining, selecting a power control strategy based on this gain to optimize transmit power settings for terminal devices, considering both signal-to-noise and interference-to-noise ratios to avoid unnecessary power emission and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power control methods are used, then terminal devices transmit power to maintain communication quality, but unnecessary power emission occurs and interference increases
Solution Approach 1:
The patent changes the parameter used for power control decisions from conventional signal-to-noise ratio alone to a composite parameter that includes interference rejection combining gain. This allows the system to account for interference cancellation capabilities when making power control decisions, reducing unnecessary power transmission while maintaining communication quality.
Solution Approach 2:
The network device calculates the interference rejection combining gain based on received signals and feeds back this information to control terminal device transmit power. This feedback mechanism enables dynamic power adjustment based on actual interference conditions, preventing both over-transmission and under-transmission of power.
2Reliability
If terminal devices increase transmit power to overcome interference, then signal quality improves, but intra-cell and inter-cell interference increases
Solution Approach 1:
The patent converts the harmful effect of interference into a beneficial factor by calculating the interference rejection combining gain, which quantifies how much interference can be cancelled. This gain information is then used to make power control decisions, allowing the system to leverage interference cancellation capabilities rather than simply fighting against interference through increased power transmission.
Solution Approach 2:
The patent introduces a new parameter (interference rejection combining gain) that captures the interference cancellation capability of the receiver. By using this parameter in power control decisions, the system can achieve better signal quality without proportionally increasing transmit power, thereby reducing the harmful interference generated.
3Productivity
If network device implements precise power control based on multiple parameters, then power efficiency improves, but computational complexity increases
Solution Approach 1:
The network device performs preliminary calculations of the interference rejection combining gain based on received signals before making power control decisions. By pre-calculating this gain parameter, the system prepares the necessary information in advance, simplifying the subsequent power control decision-making process and reducing real-time computational burden.
Data Source
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AI summary
An apparatus for a network device, the apparatus comprising at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the network device to: determine a first gain associated with a received signal, wherein the first gain characterizes a difference between a first signal to noise ratio obtainable by processing the received signal using a first technique based on interference rejection combining and a second signal to noise ratio obtainable by processing the received signal using a second technique different from the first technique, select, based on the first gain, a power control strategy out of a plurality of power control strategies for a terminal device associated with the received signal, at least temporarily apply the selected power control strategy for the terminal device.