Common Reception Apparatus for Interference Cancellation in Group Mobility
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Solution Overview
Problem
In conventional radio communication systems for mobile communications within a moving object, such as a train or bus, multiple user terminals individually communicating with a radio base station lead to inter-terminal interference, significantly reducing system performance, especially at high speeds.
Innovation Solution
A radio communication system where user terminals transmit signals received from the base station to a common reception apparatus within the moving object, which collectively processes these signals to detect and re-transmit them to each terminal, effectively canceling interference and improving multiplexing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple user terminals communicate individually with the radio base station, then each terminal can maintain independent communication, but inter-terminal interference occurs and system performance is reduced
Solution Approach 1:
The patent merges the reception functions of multiple user terminals into a single common reception apparatus. Multiple terminals collectively receive and process the base station signal, then individually obtain their desired information. This combining approach eliminates inter-terminal interference while preserving independent communication access, as each terminal can still retrieve its specific data through the shared reception system.
Solution Approach 2:
The common reception apparatus serves as an intermediary between the radio base station and multiple user terminals. Instead of direct individual communications that cause interference, the intermediary collects, processes, and distributes signals to each terminal, resolving the conflict between independent communication and system performance.
2Reliability
If a common reception apparatus is introduced to eliminate inter-terminal interference, then system performance is improved, but device complexity increases
Solution Approach 1:
The common reception apparatus performs multiple functions: receiving signals from the base station, processing the combined signal, and distributing information to multiple user terminals. This multi-functional design consolidates what would otherwise require multiple separate reception systems, improving performance while limiting the increase in overall system complexity through functional integration.
Data Source
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AI summary
To suppress reduction in system performance for mobile communications (group mobility) in a plurality of terminals existing inside the same moving object, a radio communication system is for a plurality of user terminals existing inside a moving object and a radio base station, the user terminal has a reception section that receives a signal transmitted from the radio base station, and a transmission section that transmits the signal transmitted from the radio base station to a common reception apparatus disposed inside the moving object, the common reception apparatus has a received signal detecting section that detects a signal for each user terminal, based on signals transmitted from the plurality of user terminals, and a transmission section that transmits the detected signal to each user terminal, and the user terminal receives the signal for the user terminal detected in the common reception apparatus in the reception section to demodulate. By this means, for group mobility, it is possible to cancel interference among user terminals to improve the multiplexing effect, while suppressing communication overhead.