5G Paging Reliability via Target Cell Indication
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Solution Overview
Problem
In 5G mobile communication networks, the RRC_INACTIVE state poses challenges in ensuring reliable paging, particularly during location updates, as UE may miss paging messages due to network congestion or movement out of configured areas, leading to delayed or missed connection resume requests.
Innovation Solution
A method where a first base station receives an RRC connection resume or establishment request message indicating a location update, and sends a second message allowing access or a third message denying access, with identification information of a target cell sent to a second base station for paging notification, ensuring the UE receives paging messages by triggering paging in the correct area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends an RRC connection resume request message during location update, then the UE attempts to establish connection, but the UE may miss paging messages due to network congestion or movement out of configured areas
Solution Approach 1:
The network side performs preliminary actions by sending a first indication information to the UE before the UE actually needs to resume connection. This indication information notifies the UE in advance about the location update status and paging requirements, allowing the UE to prepare accordingly and avoid missing paging messages during the connection resume process.
Solution Approach 2:
The patent implements feedback mechanisms where the network side sends indication information to the UE about location update status and paging requirements. The UE then feeds back this information in subsequent messages, creating a closed-loop communication that ensures both sides are synchronized and prevents missed paging messages.
2Adaptability or versatility
If the UE moves out of the configured RAN notification area, then the UE triggers to resume RRC connection, but the UE may still miss paging messages due to timing issues
Solution Approach 1:
The network side sends first indication information to the UE before the UE actually needs to resume connection due to area exit. This preliminary notification allows the UE to understand the paging requirements in advance and ensure proper message delivery even when the UE is in the process of moving between areas.
Solution Approach 2:
The patent introduces indication information as an intermediary element between the network side and the UE. This indication information acts as a mediator that conveys paging requirements and location update status, ensuring that the UE receives necessary paging messages even during mobility transitions when timing might be critical.
3Reliability
If the network side sends paging messages to all cells in the RAN notification area, then the UE can receive paging, but the signaling overhead increases
Solution Approach 1:
The patent applies local quality by sending paging messages selectively to specific cells rather than all cells in the RAN notification area. The network determines which cell the UE is currently in or most likely to be in, and sends paging messages only to that specific cell, reducing unnecessary signaling overhead while maintaining reliable paging delivery.
Solution Approach 2:
The patent changes the parameter of paging message delivery from broadcast to all cells to selective delivery based on UE location. By using indication information to determine the appropriate target cell, the system dynamically adjusts the paging delivery parameters to minimize signaling overhead while ensuring reliable message delivery to the correct cell.
Data Source
AI summary
Disclosed are a method and a device for improving the reliability of paging. The method comprises operations as follows. A first base station receives a first RRC message sent by a terminal. The first RRC message is an RRC connection resume request message or an RRC connection establishment request message, the first RRC message carries a first indication message, and the first indication message indicates that RRC connection resume or RRC connection establishment is used for a location update. The first base station sends, on the basis of the first indication message, a second RRC message to the terminal, the second RRC message indicates that the terminal is allowed to access to the first base station.