Mobile Terminal Receiver Settings Adaptation in Heterogeneous Networks
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Solution Overview
Problem
Mobile terminals in heterogeneous networks experience poor reception performance due to large signal strength variations between subframes in link imbalance zones, where pico cell signals are weaker than macro cell signals, leading to inadequate receiver settings adaptation.
Innovation Solution
A mobile terminal adapts its receiver settings using subframe allocation information to select signals from either restricted or unrestricted subframes, maintaining separate settings for optimal performance in link imbalance zones and for signal measurements on neighboring macro cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile terminal adapts receiver settings based on weak signals from pico cells in unrestricted subframes, then the receiver settings are updated continuously, but the reception performance deteriorates due to large signal strength variations
Solution Approach 1:
The patent segments subframes into two types: restricted subframes (where only pico cells transmit) and unrestricted subframes (where both macro and pico cells transmit). The mobile terminal adapts receiver settings using only signals from restricted subframes, separating the adaptation process from the interfering unrestricted subframes. This segmentation resolves the contradiction by enabling continuous adaptation (using restricted subframes) while avoiding performance deterioration (by excluding unrestricted subframes with large signal variations).
2Quantity of substance
If the mobile terminal uses signals from all subframes for receiver settings adaptation, then more signal samples are available for adaptation, but the measurement accuracy deteriorates due to interference from macro cell signals
Solution Approach 1:
The patent extracts and uses only the relevant signal samples from restricted subframes for receiver settings adaptation, while excluding signal samples from unrestricted subframes that contain interfering macro cell transmissions. This extraction principle resolves the contradiction by selecting a subset of signal samples (from restricted subframes) that provides both sufficient quantity for adaptation and high measurement accuracy by eliminating macro cell interference.
3Reliability
If the mobile terminal adapts receiver settings for pico cells, then data reception from pico cells improves, but signal measurements on neighboring macro cells become inaccurate
Solution Approach 1:
The patent applies different receiver settings locally for different purposes: one set of settings is adapted using restricted subframe signals for optimal pico cell data reception, while a separate set of settings is used for macro cell signal measurements. This local quality principle resolves the contradiction by creating specialized receiver configurations for each function, ensuring both pico cell reception quality and macro cell measurement accuracy can be maintained simultaneously.
Data Source
AI summary
Techniques are described for adapting receiver settings used by a mobile terminal operating in a heterogeneous network comprising macro cells and pico cells with overlapping coverage areas. A first set of subframes is allocated to the pico cells for downlink transmissions to a mobile terminal in a link imbalance zone. The mobile terminal acquires information about the subframe allocation and uses the subframe allocation information to select the signals used for adapting receiver settings used when operating in the link imbalance zone.