Dual-SIM Antenna Path Selection for Co-Channel Interference
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Solution Overview
Problem
In dual-card dual-standby dual-pass terminals, co-channel interference causes signal receiving or sending performance issues for communications chips due to shared antennas, affecting one card when both simultaneously use an antenna.
Innovation Solution
Implementing an antenna configuration method with at least two 2R paths for each secondary card-supported band, including primary and diversity receive paths, and using selection conditions like whitelists and blacklists to determine optimal path usage based on band types and card capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two communications chips share a same set of antennas to save space, then device complexity is reduced, but signal receiving or sending performance deteriorates due to co-channel interference
Solution Approach 1:
The patent segments the receive paths into multiple independent 2R paths (first 2R path, second 2R path, third 2R path, etc.), each with its own primary receive path and diversity receive path. This segmentation allows different communications chips to use different receive paths simultaneously, eliminating co-channel interference while sharing the same physical antennas. The configuration information indicates which 2R paths are available for each band, enabling independent path selection for each card.
Solution Approach 2:
The patent implements dynamic path selection based on band type (low band, medium band, high band) and card configuration. The terminal dynamically determines which 2R path to use for each communications chip based on real-time conditions such as whether the first card or second card is active, which bands are being used, and the specific band types involved. This dynamic adaptation allows optimal performance for each scenario while maintaining space efficiency through shared antennas.
2Reliability
If multiple 2R paths are configured for each band to improve signal performance, then signal receiving and sending performance is improved, but device complexity increases
Solution Approach 1:
The patent creates universal 2R path configurations that can serve multiple purposes across different bands and cards. The same receive path structure (primary receive path + diversity receive path) is reused for low bands, medium bands, and high bands. The configuration information provides a standardized format that indicates which 2R paths are available for each band type, allowing the system to handle multiple scenarios with a unified approach rather than requiring separate configurations for each band combination.
Data Source
AI summary
A terminal determines a first band of a primary card and a second band of-a secondary card; if the secondary card does not support the first band, determines a first identifier and a second identifier of a first 2R path and a third identifier and a fourth identifier of a second 2R path based on the second band, and determines a fifth identifier and a sixth identifier of a third 2R path based on the first band, where the first identifier, the third identifier, and the fifth identifier are identifiers of primary receive paths, and the second identifier, the fourth identifier, and the sixth identifier are identifiers of diversity receive paths; and determines, based on those identifiers, and a selection condition stored in the terminal, to communicate with the second base station through the secondary card by using the first 2R path or the second 2R path.