Clutter Reflection Mitigation in Full-Duplex Base Stations
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Solution Overview
Problem
Wireless communication systems, particularly in 5G new radio technology, face challenges with clutter-induced interference that affects bandwidth efficiency due to self-interference from reflections in in-band full duplex and sub-band frequency duplex operations, leading to reduced successful initial access and connected mode operations.
Innovation Solution
A method and system for clutter mitigation in base stations that involve scanning through multiple antenna beams to identify affected beams, transmitting clutter-based power commands to user equipment to increase transmit power, thereby mitigating clutter-induced interference during both initial access and connected mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If in-band full duplex operation is used to increase bandwidth efficiency, then bandwidth efficiency is improved, but self-interference from clutter reflections increases
Solution Approach 1:
The base station performs preliminary scanning through multiple antenna beams to identify clutter-affected beams before communication occurs. This advance detection allows the system to prepare appropriate power adjustment commands, enabling user equipment to transmit with sufficient power to overcome anticipated clutter interference while maintaining bandwidth efficiency through full duplex operation
Solution Approach 2:
The system dynamically adjusts the transmit power parameter of user equipment based on identified clutter conditions. When clutter-induced interference is detected in specific antenna beams, the base station sends power increase commands to affected user equipment, allowing them to compensate for the interference and maintain reliable communication while operating in bandwidth-efficient full duplex mode
2Reliability
If transmit power is increased to overcome clutter interference, then communication reliability is improved, but power consumption increases
Solution Approach 1:
Instead of increasing power universally, the system applies power increase commands selectively only to user equipment operating in identified clutter-affected antenna beams. This localized approach ensures that power consumption is increased only where necessary to overcome clutter interference, maintaining communication reliability in affected areas while preserving energy efficiency in areas without clutter problems
Solution Approach 2:
The base station continuously scans antenna beams to detect clutter-induced interference and provides feedback through power adjustment commands to user equipment. This closed-loop feedback mechanism ensures that power increases are applied dynamically based on actual clutter conditions, maintaining communication reliability while avoiding unnecessary power consumption when clutter interference is absent or minimal
Data Source
AI summary
A clutter-induced interference at a base station is mitigated through a command from the base station to a user equipment that commands the user equipment to transmit using an increased transmit power. During acquisition, the command may comprise a SIB. During a connected mode of operation, the command may comprise a TPC message, assistance information, an RRC message, or a DCI message.