Paging Early Indication to Reduce Unnecessary SSB Wake-Ups
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Solution Overview
Problem
Existing wireless communication systems face challenges in paging and power consumption, particularly for user equipment (UEs) in idle or inactive modes, as they often require unnecessary synchronization signal block (SSB) bursts due to unknown downlink channel conditions, leading to increased power consumption and signaling overhead.
Innovation Solution
Implementing a paging early indication (PEI) in a first paging cycle that indicates whether paging information will be transmitted in subsequent cycles, allowing UEs to determine the necessary number of SSB bursts or reference signal occasions to receive, thereby conserving power and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs receive paging information in every paging cycle, then paging reliability is improved, but power consumption increases due to unnecessary SSB bursts
Solution Approach 1:
The network transmits a paging early indication (PEI) in advance before the actual paging information to inform UEs whether paging will be transmitted in upcoming cycles. This preliminary information allows UEs to proactively adjust their reception behavior, skipping unnecessary SSB bursts and reducing power consumption while maintaining reliable paging reception when needed.
Solution Approach 2:
The system dynamically adapts UE paging reception behavior based on channel conditions and network state. When channel conditions are good, UEs can skip more SSB bursts. The PEI mechanism enables dynamic control of paging reception, allowing UEs to flexibly adjust their power consumption based on actual paging needs rather than following a fixed reception pattern.
2Measurement precision
If UEs perform synchronization in every paging cycle, then channel condition accuracy is improved, but signaling overhead increases
Solution Approach 1:
The PEI is transmitted in advance to provide UEs with information about upcoming paging transmissions. This preliminary indication allows UEs to perform synchronization only when necessary, rather than in every paging cycle, thereby reducing the quantity of synchronization signals and associated signaling overhead while maintaining adequate channel condition accuracy for reliable paging reception.
Solution Approach 2:
The system changes the frequency and timing of synchronization operations based on the PEI information. When PEI indicates no paging transmission, UEs reduce or skip synchronization activities. This parameter adjustment in synchronization frequency reduces signaling overhead while maintaining channel condition accuracy sufficient for the actual paging reception events.
3Reliability
If UEs monitor all paging cycles, then paging information is not missed, but power consumption increases due to unnecessary wake-ups
Solution Approach 1:
The PEI mechanism provides advance notification to UEs about upcoming paging transmissions. By monitoring the PEI in the first paging cycle and using this preliminary information, UEs can intelligently determine whether to wake up for subsequent paging cycles, ensuring they don't miss actual paging information while avoiding unnecessary wake-ups and reducing power consumption.
Solution Approach 2:
The PEI enables UEs to self-manage their paging reception behavior autonomously. Based on the PEI information received, each UE independently decides whether to wake up and monitor subsequent paging cycles or remain in sleep mode. This self-service approach optimizes power consumption while ensuring reliable paging delivery without requiring continuous network control.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for paging based on a paging early indication (PEI). Particular aspects provide for a method for wireless communication performed by a user equipment (UE). The method generally includes determining a set of paging cycles for receiving paging information from a base station (BS), receiving a first paging early indicator (PEI) from the BS in a first paging cycle of the set of paging cycles, wherein the first PEI indicates whether the paging information will be transmitted to the UE in one or more second paging cycles of the set of paging cycles occurring after the first paging cycle, and receiving the paging information in the one or more second paging cycles based on the first PEI received in the first paging cycle.