Synchronization Beam Selection for Dual-SIM Random Access Latency
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Solution Overview
Problem
Dual-SIM user equipment (UE) devices experience latency and communication delays due to overlapping transmission and reception opportunities, leading to postponed communications when both SIMs are configured for simultaneous use.
Innovation Solution
The UE selects a synchronization beam for a random access occasion that does not overlap in time with a reception opportunity, based on signal quality and non-overlapping criteria, allowing simultaneous performance of random access procedures and monitoring of reception opportunities without delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE prioritizes one SIM over the other when communication opportunities overlap, then one communication can proceed without delay, but the other communication experiences latency and increased power consumption
Solution Approach 1:
The UE dynamically adjusts its communication behavior by detecting overlapping transmission and reception opportunities and adaptively selecting which SIM to prioritize based on real-time conditions, rather than using a fixed priority scheme. This dynamic adjustment reduces latency for both SIMs by making context-aware decisions about which communication to maintain and which to delay.
Solution Approach 2:
The system changes the operational parameters of the UE by switching between different communication modes (maintaining first communication vs. delaying for second communication) based on detected overlaps. This parameter switching allows the UE to optimize latency performance by selecting the appropriate communication mode for each specific overlapping scenario.
2Adaptability or versatility
If the UE maintains both SIMs in standby mode, then both communications are available, but the UE cannot use both SIMs simultaneously due to limited resources
Solution Approach 1:
The UE implements dynamic SIM activation by transitioning between standby and active states based on real-time detection of communication opportunities. When no overlaps are detected, both SIMs can operate; when overlaps occur, the UE dynamically activates only the necessary SIM, reducing latency while maintaining dual-SIM versatility.
Solution Approach 2:
The UE performs preliminary detection of transmission and reception opportunities for both SIMs before actual communication occurs. This advance detection allows the UE to proactively identify potential overlaps and prepare appropriate responses, reducing latency by avoiding last-minute switching delays.
3Reliability
If the UE delays communication to avoid overlapping with reception opportunities, then collision is avoided, but latency increases
Solution Approach 1:
The UE changes its operational parameters by switching between maintaining communication and delaying communication based on the detection of overlaps with reception opportunities. This conditional parameter switching allows the system to maintain reliability only when necessary (when overlaps occur) while minimizing latency in normal conditions.
Solution Approach 2:
The system implements feedback by continuously monitoring for reception opportunities and adjusting communication timing based on this feedback. When reception opportunities are detected, the UE receives feedback to delay transmission; when no reception opportunities are present, the UE proceeds with transmission, optimizing the balance between reliability and latency.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may be configured with two subscriber identity modules (SIMs). The UE may select a synchronization beam associated with a random access occasion of a first SIM based on the random access occasion not overlapping in time with a reception opportunity (e.g., a paging occasion) of the second SIM. In some examples, the UE may select the synchronization beam based on an identified signal quality of the synchronization beam (e.g., in comparison to other available synchronization beams that are non-overlapping with the reception opportunity). The UE may perform a random access procedure (e.g., using the first SIM) during the random access occasion associated with the selected synchronization beam and, in some cases, may also monitor (e.g., using the second SIM) resources associated with the paging opportunity.