Downlink Power Adjustment for Uplink-Downlink Interference Reduction
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Solution Overview
Problem
In wireless communication systems, there is a challenge in reducing interference between uplink and downlink signals, particularly in LTE systems, where inter-cell or intra-cell interference occurs due to differing frame structures and power management across cells, leading to decreased signal quality and increased latency.
Innovation Solution
The method involves adjusting the power of the downlink signal by configuring a power reduction duration in subframes to minimize interference, allowing for flexible frame structure configurations and asynchronous timing between cells, thereby reducing interference between uplink and downlink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If downlink power is reduced during uplink subframes, then interference between uplink and downlink signals is reduced, but downlink signal quality deteriorates
Solution Approach 1:
The patent applies local quality by configuring different power levels for different time periods within the downlink signal. Specifically, the downlink power is reduced only during specific uplink subframes where uplink transmission occurs, while maintaining normal power levels during other downlink subframes. This localized power adjustment minimizes interference during critical uplink reception periods without degrading overall downlink signal quality, as the power reduction is applied selectively rather than globally.
Solution Approach 2:
The patent implements dynamics by making the downlink power configuration adaptive and configurable rather than fixed. The network can dynamically adjust the power reduction duration and timing based on actual uplink-downlink interference conditions, traffic patterns, and cell configuration. This configurable approach allows the system to optimize the balance between interference reduction and signal quality maintenance according to real-time operational requirements.
2Productivity
If frame structures of neighboring cells are different, then cell coverage and capacity are optimized, but interference management becomes complex
Solution Approach 1:
The patent applies preliminary action by pre-configuring power reduction parameters and frame structure settings before interference occurs. The network预先 configures the downlink power reduction duration and timing based on expected uplink subframe patterns and neighboring cell frame structures. This advance configuration simplifies real-time interference management by establishing predetermined power adjustment rules that automatically adapt to different frame structure scenarios without requiring complex real-time coordination.
3Object-affected harmful factors
If power reduction duration is extended, then interference reduction effectiveness increases, but downlink throughput decreases
Solution Approach 1:
The patent implements parameter changes by allowing flexible configuration of the power reduction duration as a可调 parameter. Rather than using a fixed power reduction period, the system can adjust the duration based on the specific uplink subframe patterns, traffic conditions, and interference levels. This enables optimization of the balance between interference reduction effectiveness and downlink throughput by tuning the power reduction duration to match actual operational requirements rather than applying a one-size-fits-all approach.
Data Source
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AI summary
The present invention provides a method for a base station to transmit a downlink signal, in order to reduce interference between uplink transmission and downlink transmission in a wireless communication system. Particularly, the method is characterized by: a step of setting a power decrease region in which downlink transmission power is transmitted by being lower than that of another region; a step of separating and generating a first transmission block corresponding to the power decrease region, and a second transmission block not corresponding to the power decrease region; and a step of mapping downlink data to the first transmission block and the second transmission block, respectively, wherein the first transmission block is transmitted with the power allocated to the power decrease region, and the second transmission block is transmitted with the power allocated to the region other than the power decrease region.