Relay Station Base Station ID Notification for LTE Reconnection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In a wireless communication system using the LTE-Advanced system, if a radio link failure occurs between a base station and a relay station, the mobile station cannot continue wireless communication because the base station that receives a reconnection request from the mobile station does not retain the necessary UE context, preventing successful reconnection.
Innovation Solution
A wireless communication system where the relay station acquires and notifies the mobile station with identification information of the base station that retains the UE context, allowing the mobile station to perform a reconnecting process with that base station, ensuring the base station has the necessary context for reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station performs reconnection to a base station selected by quality criteria, then the reconnection process can be initiated, but the base station does not retain the UE context and cannot accept the reconnection request
Solution Approach 1:
The relay station performs preliminary actions by acquiring and storing the identification information of the base station that holds the UE context before the radio link failure occurs. When reconnection is needed, this pre-acquired information is provided to the mobile station, enabling it to directly reconnect to the correct base station without losing UE context information.
Solution Approach 2:
The relay station acts as an intermediary between the mobile station and the base station. It acquires the identification information of the base station holding UE context and relays this information to the mobile station, facilitating the reconnection process without the mobile station needing to directly query or discover the appropriate base station.
2Productivity
If the mobile station reconnects to a different base station after relay station failure, then it can attempt to establish new connection, but communication continuity is broken due to lack of UE context at the new base station
Solution Approach 1:
The relay station acquires and stores the identification information of the appropriate base station (the one holding UE context) in advance, before any failure occurs. This preliminary preparation ensures that when the relay station fails, the mobile station can immediately reconnect to the correct base station without time-consuming discovery or trial-and-error processes.
Data Source
AI summary
A wireless communication system is provided in which a relay station relays wireless communication between a base station and a mobile station. The relay station includes an acquiring unit and a notifying unit. The acquiring unit acquires, from the base station that retains information on the mobile station used for the wireless communication, identification information on the base station. The notifying unit notifies the mobile station of the identification information acquired by the acquiring unit. Furthermore, the mobile station includes a reconnecting unit. When connection with the relay station is released, the reconnecting unit performs a reconnection request with respect to the base station that is identified by the identification information that is notified by the relay station.