Cross-Slot Scheduling Paging for 5G UE Power Efficiency
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in efficiently managing paging messages across UEs that support and do not support cross-slot scheduling (CSS), leading to potential power consumption issues and reduced efficiency in message delivery.
Innovation Solution
A method where a base station configures different paging occasions (POs) and parameters for UEs that support CSS and those that do not, allowing for the transmission of paging messages with CSS for capable UEs in subsequent POs, while ensuring that incapable UEs receive messages in the same PO without CSS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single paging occasion (PO) is shared by both CSS-capable and CSS-incapable UEs, then resource utilization is improved, but message delivery reliability deteriorates because CSS-capable UEs cannot receive messages in the same slot
Solution Approach 1:
The patent segments the paging occasion resources by creating two distinct PO sets: first POs for CSS-capable UEs and second POs for CSS-incapable UEs. This segmentation ensures that each UE type receives paging messages in appropriately configured time slots, preventing the reliability issue while maintaining efficient resource utilization through dedicated scheduling.
Solution Approach 2:
The patent implements dynamic scheduling where the base station transmits paging messages for CSS-capable UEs in subsequent slots rather than the same slot. This dynamic approach allows CSS-capable UEs to process scheduling information and receive messages at optimal times, while CSS-incapable UEs receive immediate notifications in their designated POs.
2Device complexity
If paging messages are transmitted in the same slot for all UEs, then simplicity is improved, but power efficiency deteriorates due to unnecessary wake-ups for CSS-capable UEs
Solution Approach 1:
The patent divides paging occasions into separate sets for CSS-capable and CSS-incapable UEs. This segmentation allows CSS-capable UEs to sleep through their designated first POs and only wake for subsequent POs when messages are transmitted, significantly reducing unnecessary power consumption while maintaining simple scheduling rules within each segment.
Solution Approach 2:
The base station performs preliminary configuration by assigning specific PO sets to each UE type in advance. CSS-capable UEs are pre-configured to monitor first POs for scheduling indications and then wake for subsequent POs only when needed, eliminating wasteful continuous monitoring and reducing power consumption before the actual paging message transmission.
3Reliability
If separate POs are assigned to CSS-capable and CSS-incapable UEs, then message delivery reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent employs dynamic resource allocation where CSS-capable UEs are assigned first POs for scheduling indications and subsequent POs for actual message reception. This dynamic two-stage approach ensures reliable delivery by separating scheduling and message transmission in time, while maintaining high resource utilization by allowing flexible assignment of POs based on UE capabilities and traffic patterns.
Data Source
AI summary
A first user equipment (UE) that does not support cross-slot scheduling (CSS) and a second UE that supports the CSS may share a paging occasion (PO), and a base station that supports CSS may configure a set of variable K0 greater than zero to the second UE. The base station may page both the first UE and the second UE in the shared PO by transmitting a first paging message for the first UE in the shared PO with K=0, and transmitting a second paging message for the second UE transmitted in the subsequent PO. The first UE may receive a paging scheduling physical downlink control channel (PDCCH) with K0=0 in the shared PO and monitor consecutive POs subsequent to the shared PO to receive the paging message. The base station may also assign separate sets of POs to the CSS-capable UE and the CSS-incapable UE.