System Information Scheduling for Low-Power SI Acquisition
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Solution Overview
Problem
UEs face inefficiencies in acquiring system information (SI) due to unnecessary decoding attempts and battery consumption, as they do not know the actual transmission occasions of SIB1 and other SIBx messages, leading to prolonged acquisition times and increased power usage.
Innovation Solution
The network transmits scheduling information, such as bitmaps of SIB1 transmission occasions, to UEs, allowing them to predict SI acquisition time and perform soft combining of PDSCH symbols, reducing unnecessary decoding and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UEs perform blind decoding attempts to acquire SIB1 and other SIBx messages without knowing actual transmission occasions, then UEs can acquire system information, but acquisition time is prolonged and battery consumption increases
Solution Approach 1:
The network transmits scheduling information (bitmaps) in advance indicating when SIB1 and other SIBx messages will be transmitted. UEs use this preliminary information to directly tune to transmission occasions without performing blind decoding attempts, thereby reducing acquisition time and battery consumption
Solution Approach 2:
Scheduling information bitmaps act as an intermediary between the network and UEs, providing indirect knowledge of transmission occasions. This intermediary allows UEs to predict when system information will be transmitted without directly monitoring every possible transmission opportunity
2Reliability
If UEs monitor all possible SIB1 transmission occasions to ensure acquisition, then SI acquisition reliability is improved, but unnecessary decoding attempts increase power consumption
Solution Approach 1:
The network provides scheduling information in advance that indicates actual transmission occasions. UEs use this information to reliably acquire SI by monitoring only the indicated occasions, eliminating unnecessary monitoring and decoding attempts while maintaining acquisition reliability
Solution Approach 2:
Instead of monitoring all possible transmission occasions (excessive action), UEs monitor only the subset of occasions indicated by the scheduling information bitmaps (partial action), achieving sufficient reliability with reduced energy consumption
3Use of energy by moving object
If the network transmits scheduling information bitmaps to indicate SIB1 transmission occasions, then UE power consumption is reduced, but network overhead increases
Solution Approach 1:
The scheduling information is transmitted as compact bitmap parameters that efficiently encode transmission occasion patterns. This parameter-based representation reduces the overhead compared to more verbose scheduling descriptions while providing sufficient information for UEs to predict transmission occasions
Solution Approach 2:
The bitmap represents a pattern or template of transmission occasions that can be reused and interpreted by UEs. This copying approach allows the network to indicate multiple transmission occasions with a compact representation rather than explicitly signaling each occasion
Data Source
AI summary
A method by a wireless device includes obtaining (1202) scheduling information indicating at least one transmission occasion in which a system information message is transmitted for a cell during a system information transmission periodicity. The wireless device receives (1204) the system information message based on the scheduling information.