Idle-Mode WTRU Paging Window Control for Lower Power Monitoring
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in power consumption during idle mode, particularly in determining optimal paging occasions and monitoring for paging indicators, leading to unnecessary power usage by wireless transmit/receive units (WTRUs).
Innovation Solution
WTRUs determine a time window based on an offset from a paging occasion and monitor for cell-specific and WTRU-group specific paging indicators, allowing them to skip unnecessary monitoring and reduce power consumption by selectively receiving system information blocks and paging physical downlink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WTRUs monitor for paging indicators at every paging occasion, then paging reliability is improved, but power consumption increases
Solution Approach 1:
The paging indicator monitoring is segmented into multiple types (first PI and second PI) with different monitoring requirements. WTRUs monitor the first PI at every paging occasion for basic paging information, and only monitor the second PI at specific monitoring occasions when wake-up indication is received, thereby reducing overall monitoring frequency and power consumption while maintaining reliable paging detection
Solution Approach 2:
The patent implements periodic monitoring of paging indicators at defined paging occasions rather than continuous monitoring. WTRUs wake up at specific periodic intervals to monitor PIs and then return to idle state, creating a periodic action pattern that reduces power consumption compared to continuous monitoring while ensuring paging reliability through regular checks
2Reliability
If WTRUs monitor for both cell-specific and WTRU-group specific paging indicators, then paging coverage is improved, but device complexity increases
Solution Approach 1:
Paging indicators are segmented into two distinct types: cell-specific first PIs that provide general paging information, and WTRU-group specific second PIs that provide targeted paging information. This segmentation allows WTRUs to monitor different PI types based on their specific needs and configurations, improving paging coverage while managing complexity through structured differentiation
Solution Approach 2:
Different monitoring strategies are applied to different PI types based on their local characteristics. Cell-specific PIs are monitored at every paging occasion with standardized procedures, while WTRU-group specific PIs are monitored selectively at specific monitoring occasions based on wake-up indications, optimizing the balance between coverage and complexity for each PI type
3Measurement precision
If WTRUs receive system information blocks on wake-up indication, then information accuracy is improved, but power consumption increases
Solution Approach 1:
System information blocks are received in advance as wake-up indications before actual paging occurs. This preliminary action allows WTRUs to prepare for upcoming paging events with accurate information, improving measurement precision and information accuracy while enabling efficient power management by knowing in advance when to wake up and when to remain in low-power state
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for wireless transmit/receive unit (WTRU) power saving (e.g., for idle mode). A WTRU may determine a time window associated with one or more paging indicators. The WTRU may monitor for a paging indicator (e.g., a first paging indicator) in the time window. The WTRU may monitor for another paging indicator (e.g., a second paging indicator) in the time window. The WTRU may receive system information blocks (SIBs) if a wake up indication for the WTRU is received in a single paging indication and the paging indicator is the first paging indicator. The WTRU may monitor for a paging PDCCH at a monitoring occasion of a PO in a paging frame if the second paging indicator is received and includes an indication for the WTRU to wake up.