WTRU System Information Update Using Active and Passive Receiver Switching
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Solution Overview
Problem
Existing wireless transmit/receive units (WTRUs) equipped with passive receivers face challenges in supporting cellular idle mode functionalities such as cell re-selection, paging, random access, and system information updates with minimal power consumption.
Innovation Solution
A method and apparatus for a WTRU to update system information using a combination of active and passive receivers. The WTRU receives and stores system information using an active receiver, then deactivates it and activates a passive receiver to determine if changes in system information parameters exceed a threshold, triggering the reactivation of the active receiver for updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active receiver is continuously used to monitor system information updates, then system information update reliability is improved, but power consumption increases
Solution Approach 1:
The WTRU performs preliminary actions by storing system information and its parameters during active periods, then uses this stored information to autonomously determine whether updates are needed during passive periods. This preliminary preparation enables the device to skip continuous active monitoring while maintaining update reliability.
Solution Approach 2:
The WTRU implements a feedback mechanism where it continuously compares current system information parameters against stored threshold values and previously stored system information. This feedback loop allows the device to intelligently determine when active receiver reactivation is necessary, balancing reliability with power savings.
2Use of energy by moving object
If a passive receiver is used to reduce power consumption, then power consumption is reduced, but ability to detect system information updates deteriorates
Solution Approach 1:
The stored system information parameters act as an intermediary between the passive receiver and the network's system information broadcasts. Instead of directly monitoring all broadcasts, the WTRU uses stored parameters as a reference point to indirectly detect relevant updates, reducing detection complexity while maintaining accuracy.
Solution Approach 2:
The invention focuses monitoring efforts on specific parameters that are likely to change (such as system information version indicators). By tracking parameter changes rather than entire system information sets, the passive receiver can effectively detect updates with minimal power consumption.
3Use of energy by moving object
If the active receiver is deactivated to save power, then power consumption is reduced, but system information update timeliness worsens
Solution Approach 1:
The invention replaces the mechanical approach of continuous active receiver operation with an information-processing approach. The WTRU uses logical comparisons of stored parameters against received information to detect updates, substituting continuous physical monitoring with intelligent periodic checking that maintains timeliness while reducing power consumption.
Data Source
AI summary
A method for use in a Wireless Transmit/Receive Unit (WTRU). The method comprises: receiving, using an active receiver, system information comprising a first system information set, wherein the first system information set is currently valid for the WTRU; storing the system information; deactivating the active receiver and activating a passive receiver; determining whether a difference between a first parameter in the BSSI and a first parameter in the first system information set is greater than a threshold value, wherein on a condition that the difference is greater than the threshold value, reactivating the active receiver to receive a second system information set as a currently valid system information set for the WTRU.