Anchor Base Station RAN-Based Paging for Inactive UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In a 5G communication system, base stations face challenges in managing user equipment (UE) in an RRC-inactive state, particularly in determining paging area identity (PAI) and paging DRX parameters, as the next-generation core network does not transmit S1 or NG1 paging messages, making it difficult for anchor base stations to perform RAN-based paging.
Innovation Solution
The method involves receiving paging-related information from a core network node, storing this information, and using it to page the UE after it enters the RRC-inactive state, which includes parameters like UE identity, PAI list, TAI list, paging DRX, and mobility patterns, allowing the base station to initiate RAN-based paging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters RRC-inactive state to reduce power consumption and maintain connection state, then power consumption is reduced and connection state is maintained, but the base station cannot obtain paging parameters (PAI, paging DRX) from the core network
Solution Approach 1:
The base station performs preliminary action by storing paging-related information (PAI, paging DRX, UE identity) received during the RRC-connected state before the UE transitions to RRC-inactive state. This preliminary storage enables the base station to retain necessary paging parameters locally, allowing RAN-based paging to function correctly after the UE enters inactive state without requiring continuous core network communication.
2Device complexity
If the core network does not transmit S1/NG1 paging messages for RRC-inactive UEs, then the core network simplifies its operation, but the base station cannot perform RAN-based paging
Solution Approach 1:
The base station acts as an intermediary by storing paging-related information locally during RRC-connected state and using this stored information to perform RAN-based paging when the UE is in RRC-inactive state. This intermediary approach enables the base station to bridge the gap between core network simplification and RAN-based paging capability, allowing paging to function without continuous core network involvement.
3Ease of operation
If the base station stores paging-related information during RRC-connected state, then RAN-based paging becomes possible after UE enters inactive state, but the base station must maintain additional context information
Solution Approach 1:
The base station performs multi-functionality by using the same stored paging-related information (UE identity, PAI, paging DRX) for both RRC-connected state management and subsequent RRC-inactive state paging operations. This universal use of stored context enables the base station to handle both connected and inactive state requirements without requiring separate dedicated storage mechanisms, thereby enabling RAN-based paging while limiting the increase in complexity.
Data Source
AI summary
Disclosed are a method whereby a base station manages a UE context in a wireless communication system, and a device for supporting same. The method comprises the steps of: receiving paging-related information of UE from a core network node; storing the paging-related information; and carrying out paging with respect to the UE on the basis of the paging-related information after the UE has entered an RRC-inactive state.