Adaptive Antenna Selection for EN-DC NR Interference and SAR
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Solution Overview
Problem
Current electronic devices face challenges in efficiently selecting and utilizing antennas for New Radio (NR) carriers in EN-DC (Evolved Universal Terrestrial Radio Access - New Radio Dual-Connectivity) systems, leading to interference and performance degradation, particularly affecting camera noise and Specific Absorption Rate (SAR).
Innovation Solution
The electronic device includes multiple antennas for different frequency bands, with a processor controlling the selection of an anchor antenna and additional antennas based on the LTE and NR carrier frequency bands, and uses a switching mechanism to distribute power and feed NR carrier signals to both the NR transmission/reception antenna and additional antennas, optimizing antenna performance and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are simultaneously transmitted and received to improve communication reliability, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic antenna selection where the electronic device switches between single-antenna and multi-antenna modes based on channel conditions. When channel quality is good, only one antenna is used for transmission and reception; when channel quality degrades, additional antennas are activated to maintain communication reliability. This dynamic adaptation resolves the contradiction by making the system flexible rather than statically using all antennas continuously.
Solution Approach 2:
The system changes operational parameters (number of active antennas) based on channel state information. The base station and user equipment exchange feedback about channel quality, and this information triggers parameter changes in the number of simultaneously active transmit and receive antennas. This allows the system to optimize the balance between reliability and power consumption by adjusting antenna usage according to actual communication needs.
2Measurement precision
If channel state information is frequently exchanged to improve antenna selection accuracy, then antenna selection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial channel state information exchange by selecting a subset of candidate antennas for detailed feedback rather than evaluating all possible antenna combinations. The base station provides downlink reference signals for a limited set of candidate antennas, and the user equipment provides uplink feedback only for these selected candidates. This partial action approach achieves sufficient antenna selection accuracy while significantly reducing the signaling overhead compared to exhaustive channel state information exchange.
Data Source
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AI summary
The electronic device may comprise: a wireless communication circuit for supporting evolved-universal terrestrial radio access (E-UTRA)-new radio (NR)-dual connectivity (DC), and a first antenna for at least one first long-term evolution (LTE) frequency band; a second antenna for at least one second LTE frequency band and at least one first new radio (NR) frequency band; a third antenna for at least one second NR frequency band; an NR transmission/reception antenna for the at least one first NR frequency band and the at least one second NR frequency band; and a processor.