Base Station Frequency Gap and Power Control for 5G Interference
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Solution Overview
Problem
Current 5G communication systems face challenges in suppressing signal interference, particularly cross-link interference (CLI), due to the lack of alignment in downlink (DL) and uplink (UL) timing between base stations, leading to interference between DL and UL signals when used in the same frequency resource.
Innovation Solution
A method is introduced where a base station determines and indicates to a terminal the presence or absence of a frequency gap and reduction in transmission power, allowing for dynamic configuration of frequency gaps and transmission power adjustments to mitigate interference. This involves configuring frequency gaps and reducing transmission power based on resource allocation information and interference likelihood, using control signals like DCI to instruct terminals on optimal resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency resources are allocated for both downlink and uplink transmissions in the same time resource, then communication efficiency is improved, but signal interference between downlink and uplink increases
Solution Approach 1:
The frequency resource is segmented into multiple sub-resources separated by frequency gaps. The base station divides the allocated frequency bandwidth into distinct segments, inserting frequency gaps between downlink and uplink transmissions within the same time resource. This segmentation allows both directions to use the same time resource while preventing interference through spatial separation in the frequency domain.
Solution Approach 2:
The frequency gap acts as an intermediary element between downlink and uplink transmissions. By introducing these gaps, the base station creates protective zones that isolate the two transmission directions, allowing simultaneous operation without direct signal interference. The frequency gap serves as a mediator that enables efficient resource utilization while maintaining signal integrity.
2Object-generated harmful factors
If frequency gaps are introduced to reduce interference, then signal interference is suppressed, but frequency resource utilization decreases
Solution Approach 1:
The base station dynamically determines the presence and size of frequency gaps based on real-time interference conditions and resource allocation requirements. Rather than using fixed gaps, the system adapts the gap configuration dynamically, adjusting the frequency resource allocation to minimize both interference and wasted spectrum. This dynamic approach allows the system to optimize the trade-off between interference suppression and resource utilization.
Solution Approach 2:
The base station changes the parameter of frequency gap size and position based on the allocated resource amount and interference likelihood. By varying these parameters dynamically, the system can reduce interference in scenarios where it is most needed while maximizing resource utilization where interference is minimal, achieving an optimized balance between the two competing objectives.
3Object-generated harmful factors
If transmission power is reduced to suppress interference, then signal interference is decreased, but transmission quality may deteriorate
Solution Approach 1:
The base station applies different transmission power levels to different frequency sub-resources based on local interference conditions. Instead of uniformly reducing power across all transmissions, the system selectively adjusts power only in specific frequency segments where interference is likely to occur, while maintaining full power in clean frequency regions. This localized power control preserves overall transmission quality while suppressing interference where needed.
Solution Approach 2:
The base station uses feedback information about interference conditions and channel quality to determine optimal transmission power levels. By continuously monitoring the communication environment and adjusting power based on real-time feedback, the system ensures that power reduction is applied only when and where necessary, maintaining transmission reliability while effectively suppressing interference.
Data Source
AI summary
This base station comprises: a control circuit that determines information relating to the presence or absence of at least one setting among a frequency gap with respect to resource allocation of signals, and a reduction in transmission power with respect to the signals; and a transmission circuit that notifies a terminal of the information.