Base Station Interference Cancellation via Request Signaling
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Solution Overview
Problem
In mobile communication systems, unlicensed frequency bands shared by multiple operators and systems face interference issues due to the lack of effective mechanisms for managing interference from hidden terminals, which limits the availability and quality of radio communication.
Innovation Solution
A base station and radio terminal configuration that includes a controller to transmit request information to another base station to stop interference signals, using a predetermined signal to determine if the unlicensed band is available, thereby mitigating interference and ensuring clear channel determination before transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unlicensed frequency bands are shared by multiple operators and communication systems, then frequency band utilization is improved, but interference between different operators and systems increases
Solution Approach 1:
The base station transmits transmission request information to another base station based on interference detection feedback. The system continuously monitors interference levels and adjusts transmission behavior accordingly, creating a closed-loop control mechanism that adapts to changing interference conditions in the shared unlicensed band.
Solution Approach 2:
The patent introduces an intermediary mechanism where base stations exchange transmission request information through a coordinated control process. This intermediary communication protocol allows operators to manage interference by negotiating transmission rights before actual transmission occurs, preventing direct conflict between multiple users of the shared spectrum.
2Object-affected harmful factors
If clear channel determination process (LBT) is performed before transmission, then interference is reduced, but transmission availability decreases due to additional processing time
Solution Approach 1:
The base station performs preliminary actions by detecting interference signals and determining transmission conditions before actual data transmission. By pre-assessing the channel state and interference level, the system can make informed decisions about whether to proceed with transmission, reducing unnecessary LBT cycles and improving overall transmission availability.
Solution Approach 2:
The patent applies partial action by implementing LBT only when necessary based on interference detection, rather than performing a full LBT cycle for every transmission opportunity. This selective approach reduces processing time and improves transmission availability while still maintaining interference protection where needed.
3Reliability
If transmission request information is transmitted to another base station to stop interference, then interference management is improved, but system complexity increases
Solution Approach 1:
The base station performs self-service by autonomously detecting interference signals and initiating the transmission request process without requiring external intervention. The system monitors its own transmission environment, identifies interference sources, and coordinates resolution through automated exchange of transmission request information with neighboring base stations.
Solution Approach 2:
The patent extracts the interference management function from the broader transmission control system, creating a dedicated mechanism for detecting and addressing interference. By separating this specific function into a distinct process with dedicated detection and coordination steps, the system manages complexity through modularization rather than attempting to handle all control functions monolithically.
Data Source
AI summary
A base station (eNB 200-1) operated in a specific frequency band shared by a plurality of operators or a plurality of communication systems transmits, to another base station (eNB 200-2) operated in the specific frequency band, transmission request information requesting transmission of a predetermined signal for stopping transmission of an interference signal by an interference source (UE 100-2) causing interference to a radio terminal (UE 100-1) connected to the base station.