PPCH Paging Monitoring for SDT Termination Decisions
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Solution Overview
Problem
There is a need for improved methods in next-generation wireless communication systems to efficiently monitor paging messages during small data transmission (SDT) procedures, particularly in Idle mode, to optimize network services and handle various use cases such as eMBB, mMTC, and URLLC.
Innovation Solution
A method and UE are provided to monitor physical paging channels for receiving paging messages, determine whether to terminate the SDT procedure based on received messages, and manage RRC states accordingly, including decoding specific identifiers and resetting the MAC entity when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors paging messages during SDT procedure in Idle mode, then the network can timely deliver downlink data or signaling to the UE, but the UE's power consumption increases
Solution Approach 1:
The UE monitors paging messages periodically at specific paging occasions rather than continuously. The monitoring is triggered by paging indicators that wake the UE from low-power state only when downlink data or signaling is expected, achieving reliable delivery while minimizing power consumption through periodic rather than continuous operation
Solution Approach 2:
The network uses paging indicators to self-notify the UE when downlink data is available. The UE autonomously decides when to wake up and monitor based on these indicators, eliminating the need for continuous active monitoring and reducing power consumption while maintaining reliable connectivity
2Adaptability or versatility
If the UE monitors both CN paging messages and RAN paging messages, then all types of paging can be received, but the monitoring complexity increases
Solution Approach 1:
The paging monitoring function is segmented into two separate channels: CN paging messages for core network signaling and RAN paging messages for access network control. The UE can selectively monitor based on its current state and needs, reducing overall complexity while maintaining comprehensive paging reception capability
Solution Approach 2:
The UE performs partial monitoring by focusing on the most critical paging messages for its current state. During SDT procedure, the UE prioritizes monitoring RAN paging messages while potentially reducing CN paging monitoring intensity, achieving sufficient adaptability with reduced complexity
3Loss of time
If the SDT procedure is terminated upon receiving paging messages, then the UE can respond to network signaling timely, but the ongoing data transmission may be interrupted
Solution Approach 1:
The SDT procedure termination is made dynamic rather than static. The UE evaluates the type of paging message received and its own transmission state to dynamically decide whether to terminate SDT. For urgent signaling, termination occurs quickly; for routine paging, the UE can postpone termination until data transmission completes, balancing response time with transmission efficiency
Solution Approach 2:
The UE performs preliminary evaluation of paging messages before committing to SDT termination. The UE checks paging message priorities and its current transmission status in advance, allowing it to make informed decisions that minimize both response time loss and data transmission interruption
Data Source
AI summary
A method for a user equipment (UE) to monitor paging messages is provided. The method monitors, while the UE is in an Idle mode, a physical paging channel (PPCH) for receiving paging messages associated with the UE from a serving radio access network (RAN). The method receives one or more paging messages associated with the UE while monitoring the PPCH. The method then determines, whether the one or more paging messages are received during a small data transmission (SDT) procedure. The method further determines whether to terminate the SDT procedure or not after determining that the one or more paging messages are received during the SDT procedure.