System Information Block Timing for Deep-Sleep UE Monitoring
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Solution Overview
Problem
User Equipment (UE) in wireless communication systems consumes excessive energy due to the need to monitor for System Information Block One (SIB1) every 20 ms, preventing it from entering a deep sleep state during idle mode mobility or cell reselection.
Innovation Solution
A network entity transmits information indicating the timing of when to monitor for SIB1, allowing the UE to sleep more and enter a deep sleep, thereby conserving power by not having to wake up every 20 ms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors for SIB1 every 20 ms to ensure reliable system information reception, then the reliability of system information acquisition is improved, but the energy consumption increases and the UE cannot enter deep sleep state
Solution Approach 1:
The network entity transmits SIB1 at specific periodic intervals (e.g., every 160 ms) rather than continuously, and informs the UE of these transmission occasions. The UE then monitors only at these predetermined periodic intervals, allowing it to enter deep sleep between monitoring occasions. This periodic transmission approach maintains reliable system information delivery while significantly reducing UE energy consumption compared to continuous monitoring.
2Use of energy by moving object
If the UE enters deep sleep state to conserve energy, then the energy efficiency is improved, but the UE cannot reliably receive system information updates
Solution Approach 1:
The network entity performs preliminary action by transmitting the SIB1 scheduling information (including time location, periodicity, and other parameters) to the UE in advance, before the UE enters deep sleep state. This preliminary provision of monitoring parameters enables the UE to know exactly when to wake up and monitor for SIB1, ensuring reliable system information reception while allowing the UE to maintain deep sleep during intervals when no SIB1 transmission is scheduled.
3Loss of information
If the UE monitors for SIB1 frequently to ensure timely updates, then the information freshness is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The network entity configures SIB1 to be transmitted at specific periodic intervals (e.g., every 160 ms with variable repetition periodicity within the period), and the UE monitors only at these predetermined periodic occasions. This periodic monitoring approach ensures the UE receives timely system information updates without the need for continuous or frequent monitoring, thereby reducing processing complexity and overhead while maintaining information freshness.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive information that indicates a time location of when to monitor for a system information block one (STB1). The UE may monitor for the SIB1 at the time location. Numerous other aspects are described.