Small Cell Search Staggering in Multi-Subscription Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-subscription multi-standby communication devices face challenges in managing the small cell search function during active communication sessions, as the search process can be time-consuming and may interrupt or degrade the ongoing call, especially in mobile scenarios where the device may move out of coverage before completing the search.
Innovation Solution
The device implements a method to stagger the small cell search function by temporarily suspending the active communication session to receive small cell information from multiple cells, ranking them based on signal strength, and selecting the best cell for reselection, while using a dynamically determined timer to balance search accuracy and session impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device performs small cell search by tuning away to receive small cell information, then cell reselection accuracy is improved, but the active communication session is interrupted and throughput is reduced
Solution Approach 1:
The device performs preliminary actions by receiving small cell information before the active communication session is fully established or by preparing cell reselection decisions in advance. The method allows the device to tune away to receive small cell information (MIBs, SIBs) and store it for later use, so that when cell reselection is needed, the device can quickly make a decision without interrupting the ongoing call.
Solution Approach 2:
The device implements periodic action by using a timer mechanism to periodically check for small cell information and periodically tune away to scan for small cells. The timer is dynamically adjusted based on the active communication session state, allowing the device to perform cell search at scheduled intervals rather than continuously, thus balancing search accuracy with maintaining communication throughput.
2Reliability
If the device continuously scans for small cells during active communication, then cell reselection readiness is improved, but the impact on active communication session increases
Solution Approach 1:
The device applies dynamics by making the cell search behavior adaptive and flexible. The timer duration for small cell search is dynamically determined based on the active communication session parameters. When the session is stable, the device can perform more extensive searches; when the session is critical, the search is reduced or postponed. This dynamic adjustment ensures cell reselection readiness while minimizing harm to the active communication session.
Solution Approach 2:
The device changes parameters such as timer duration, search frequency, and scan depth based on the communication session state. The method dynamically determines timer parameters and adjusts them according to whether the device is in a voice call, data session, or idle state. This parameter change allows the system to optimize between cell reselection readiness and maintaining communication quality.
3Device complexity
If the device uses a fixed timer for small cell search, then implementation simplicity is improved, but search accuracy in mobile scenarios deteriorates
Solution Approach 1:
The device transitions from a fixed timer to a dynamic timer that adapts to mobile scenarios. The timer duration is determined based on device mobility state, communication session type, and current network conditions. This allows the search accuracy to be optimized for mobile scenarios where cells change rapidly, while maintaining reasonable implementation complexity through algorithmic approaches rather than hardware complexity.
Data Source
AI summary
Embodiments include systems and methods for managing performance of a small cell search function during an active communication session via a first subscription in a multi-subscription multi-standby communication device. A device processor may perform a first tune away to a second subscription to receive first small cell information, and may tune back to the first subscription after receiving the first small cell information to resume the active communication session. The device processor may perform a second tune away to the second subscription to receive second small cell information, and may tune back to the first subscription after receiving the second small cell information to resume the active communication session. The device processor may select one of the first small cell and the second small cell for cell reselection based on the first small cell information and the second small cell information.