UE Paging Type Detection for NAS/RRC State Alignment
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Solution Overview
Problem
The issue of paging process failure in UE devices due to differing understandings of the UE's state between the network and the device itself, particularly in the inactive state, leading to inaccurate message reception.
Innovation Solution
A method and system for UE and base station to determine the paging type (access network or core network) and update the NAS and RRC layers accordingly to ensure accurate paging message reception, using explicit or implicit indication methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE remains in inactive state to save power, then power consumption is reduced, but the UE may fail to accurately receive paging messages due to state misunderstanding between network and device
Solution Approach 1:
The network performs preliminary actions by sending indication information to the UE before paging messages, clearly defining the UE's state (idle or inactive) and the corresponding paging period. This preliminary state definition prevents subsequent misunderstandings about whether the UE should be monitoring paging messages, thereby ensuring reliable message reception while allowing the UE to remain in low-power inactive state.
Solution Approach 2:
The system implements feedback mechanisms where the network sends indication information to the UE about its current state and paging configuration. The UE uses this feedback to adjust its monitoring behavior accordingly, ensuring it wakes up at the correct paging periods to receive messages while maintaining power savings during inactive periods.
2Reliability
If the UE frequently monitors paging messages to ensure accurate reception, then paging success rate is improved, but power consumption increases
Solution Approach 1:
The UE dynamically adjusts its monitoring behavior based on received indication information. When indicated to be in inactive state, the UE monitors paging messages only at specific configured periods rather than continuously. This dynamic adaptation allows the UE to maintain reliable paging reception while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The system implements periodic paging monitoring where the UE wakes up at predetermined intervals to check for paging messages during inactive state. This periodic action pattern ensures the UE doesn't miss important messages while avoiding continuous monitoring that would drain battery power, achieving a balance between reliability and energy efficiency.
3Reliability
If the network sends detailed paging information to ensure accurate UE state understanding, then paging reliability is improved, but signaling overhead increases
Solution Approach 1:
The paging information is segmented into two parts: indication information sent to the UE about its state and paging period, and actual paging messages sent at configured intervals. This segmentation allows the network to provide necessary state information without overwhelming the UE with continuous detailed instructions, reducing overall signaling overhead while maintaining reliability.
Solution Approach 2:
The network changes key parameters (UE state indication and paging period configuration) to control UE behavior. By adjusting these parameters based on network conditions and UE capabilities, the system achieves reliable paging delivery with optimized signaling overhead, avoiding the need to send excessive detailed instructions.
Data Source
AI summary
A paging method, a base station and a UE are provided. The paging method includes: receiving, by a UE in an inactive state, a paging message for determining a paging type, the paging message being transmitted from a base station, the paging type including an access network paging initiated by an access network or a core network paging initiated by a core network; determining, by the UE, the paging type corresponding to the paging message; and when the paging type corresponding to the paging message is the core network paging, updating, by the UE, each of states of a NAS layer and an RRC layer of the UE into an idle state, and responding to, by the UE, the paging message.