Idle-Mode Antenna Pair Selection for Stronger UE Reception
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, antenna selection in radio resource control (RRC) idle mode is limited to a default antenna pair, which may not be the best performing antennas, leading to suboptimal signal quality during idle activities such as SIB reading and paging message reception.
Innovation Solution
A configuration that allows user equipment (UE) to dynamically select an antenna based on channel conditions while in RRC idle mode, enabling selection from a plurality of available antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a default antenna pair is used in RRC idle mode, then device complexity is reduced and ease of operation is improved, but signal quality and reception performance deteriorate
Solution Approach 1:
The patent implements dynamic antenna selection in RRC idle mode, allowing the UE to switch between different antenna pairs based on real-time channel conditions. The UE measures channel quality indicators (RSRP, RSRQ) for multiple antenna pairs and dynamically selects the best performing pair, transforming the static default antenna configuration into a dynamic adaptive system that optimizes signal quality while maintaining manageable complexity through automated measurement and selection procedures
Solution Approach 2:
The patent changes the operational parameters of the antenna system by measuring and comparing channel conditions (RSRP, RSRQ) for different antenna pairs and selecting based on these parameter variations. This allows the system to adapt to changing wireless environments by adjusting which antenna pair is active, thereby improving signal quality without requiring complex manual intervention
2Reliability
If dynamic antenna selection is implemented in RRC idle mode, then signal quality and reception performance are improved, but device complexity and measurement overhead increase
Solution Approach 1:
The patent enables the UE to perform self-service antenna selection by autonomously measuring channel conditions for multiple antenna pairs, comparing the measurements, and selecting the optimal pair without network intervention. This self-service approach improves reception performance while managing complexity by embedding the measurement and selection logic within the UE itself, eliminating the need for complex network-side coordination
Solution Approach 2:
The patent implements preliminary measurement of channel conditions for multiple antenna pairs before actual data reception occurs in idle mode. By performing these measurements in advance and establishing baseline performance metrics, the system prepares the optimal antenna configuration ahead of time, reducing the complexity of real-time decision-making during actual reception operations
Data Source
AI summary
Method and apparatus for antenna selection in idle mode. The apparatus measures a channel condition for each of a plurality of antennas at a UE. The apparatus dynamically selects, while in a RRC idle mode, at least one antenna from the plurality of antennas based on the channel condition. The apparatus may terminate measurement of the channel condition for each of the plurality of antennas in response to the channel condition on two active antennas being greater than a first threshold T0 and a PDSCH result comprises a CRC pass rate of 100%. The apparatus may trigger a measurement across the plurality of antennas in response to the channel condition across a first pair of active antennas is less than a second threshold (T1). The apparatus may determine whether a second pair of antennas have channel conditions greater than the second threshold.