Group Paging Early Indication for Low-Power Multicast Notification
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Solution Overview
Problem
In wireless communication systems, UEs in RRC_IDLE/INACTIVE state need to frequently monitor paging messages to receive multicast services, leading to increased power consumption and potential missed notifications due to the lack of subgroup identification in paging early indicators.
Innovation Solution
A wireless device acquires a specific paging subgroup ID and monitors paging occasions based on a paging early indication (PEI), determining whether to monitor further based on the indicator, thereby optimizing power usage and ensuring multicast session activation notifications are not missed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE in RRC_IDLE/INACTIVE monitors every paging occasion to receive multicast service notifications, then the UE can ensure receipt of activation notifications, but the power consumption increases significantly
Solution Approach 1:
The network transmits a paging early indication (PEI) before the actual paging occasion to inform UEs whether a group paging message will be transmitted. This preliminary action allows UEs to avoid monitoring paging occasions when no notification is scheduled, thereby reducing power consumption while ensuring reliable receipt of multicast service activation notifications.
Solution Approach 2:
The paging early indication acts as an intermediary signal between the network and the UE. It provides advance information about upcoming group paging messages, enabling UEs to make informed decisions about whether to activate their receivers for monitoring paging occasions, thus balancing reliability and power consumption.
2Reliability
If a UE monitors paging occasions frequently to receive group paging messages, then the UE can capture multicast service notifications, but the UE may miss notifications if it doesn't know when group paging is transmitted
Solution Approach 1:
The network transmits a paging early indication (PEI) before the actual paging occasion to inform UEs whether a group paging message will be transmitted. This preliminary action allows UEs to avoid monitoring paging occasions when no notification is scheduled, thereby reducing power consumption while ensuring reliable receipt of multicast service activation notifications.
3Use of energy by moving object
If a PEI includes specific subgroup IDs, then UEs can selectively monitor paging occasions, but UEs interested in multicast services cannot determine when group paging is transmitted without knowing subgroup IDs
Solution Approach 1:
The paging early indication includes a group paging indicator that provides partial information about upcoming group paging messages without requiring complete subgroup ID matching. This partial information is sufficient for UEs interested in multicast services to determine when to monitor paging occasions, balancing power consumption and notification receipt reliability.
Data Source
AI summary
A method and apparatus for group paging in a wireless communication system is provided. A wireless device acquires a specific paging subgroup identifier (ID) related to the wireless device. A wireless device joins a multicast session. A wireless device receives, from a network, a paging early indication (PEI) which does not include the specific paging subgroup ID. A wireless device monitors a paging occasion associated with the PEI, to receive an activation notification for the multicast session.