Terminal Apparatus Interference Suppression via Dynamic Scheduling
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Solution Overview
Problem
In cellular communication systems, interference between adjacent frequency bands can occur due to the reception of out-of-band components of uplink signals, especially when terminal apparatuses are close, leading to significant interference with downlink signals, even with guard bands in place.
Innovation Solution
A terminal apparatus and base station apparatus system that allows for measurement and scheduling adjustments to minimize interference by obtaining and analyzing setting information from a different frequency band, determining whether to transmit signals using specific time and frequency resources, and adjusting communication schedules to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a guard band is provided between adjacent frequency bands to suppress interference, then interference suppression is improved, but communication flexibility and resource utilization deteriorate
Solution Approach 1:
The patent implements dynamic interference suppression by having terminal apparatuses measure signals in adjacent frequency bands and report measurement results to base stations. The base station then dynamically adjusts scheduling decisions based on these measurements, allowing the system to adaptively suppress interference only when and where needed, rather than using static guard bands that reduce flexibility.
Solution Approach 2:
The patent establishes a feedback mechanism where terminal apparatuses measure signals in adjacent frequency bands and report these measurements back to the base station. The base station uses this feedback information to make informed scheduling decisions, enabling interference suppression without requiring fixed guard bands that would limit communication flexibility.
2Reliability
If terminal apparatuses collectively receive signals in a certain frequency band including multiple communications carriers, then reception capability is improved, but interference from uplink signals of adjacent frequency bands worsens
Solution Approach 1:
The patent implements preliminary measurement action by having terminal apparatuses measure signals in adjacent frequency bands before actual communication occurs. The base station receives these measurement results and uses them to make proactive scheduling decisions that prevent interference from occurring in the first place, rather than reacting to interference after it has degraded reception.
Solution Approach 2:
The patent applies local quality control by having terminal apparatuses perform measurements specifically in adjacent frequency bands where interference is most likely to occur. The base station then applies targeted scheduling restrictions only to terminal apparatuses and frequency resources that pose interference risks, rather than uniformly limiting all communications, thus maintaining overall reception capability while suppressing localized interference.
3Object-affected harmful factors
If measurement and scheduling adjustments are implemented to suppress interference, then interference suppression is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service by having terminal apparatuses autonomously perform measurements in adjacent frequency bands and report results to the base station. The base station then autonomously makes scheduling decisions based on these reports. This distributed self-service approach reduces the need for complex centralized control mechanisms while achieving effective interference suppression.
Data Source
AI summary
A terminal apparatus obtains, from a first base station apparatus that belongs to a first communication system that uses a first frequency band, setting information indicating setting of measurement in a second frequency band that is different from the first frequency band and is used for a second communication system, performs measurement of a predetermined signal transmitted from a second base station apparatus that belongs to the second communication system, based on the setting information, notifies the first base station apparatus of a result of the measurement, and communicates with the first base station apparatus in accordance with scheduling performed by the first base station apparatus based on the result of the measurement.