Relay Apparatus Backhaul Link Failure Detection
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Solution Overview
Problem
In mobile communication systems, existing technologies face challenges in dynamically managing communication paths and radio resources, especially when backhaul link failures occur, leading to disruptions in service and inefficient resource allocation.
Innovation Solution
A communication control method that utilizes dual connectivity between a first relay apparatus and both a master node and a secondary node, allowing for the detection of backhaul link failures and initiating procedures for RRC reestablishment, while also transmitting failure notifications to lower apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity communication is implemented between relay apparatus and master/secondary nodes, then communication path redundancy and service continuity are improved, but device complexity and control overhead increase
Solution Approach 1:
The patent segments the control plane by introducing separate failure notification mechanisms for master node and secondary node backhaul link failures. The relay apparatus independently monitors and reports failures to different nodes, allowing distributed failure management that reduces centralized control complexity while maintaining service continuity through redundant paths.
Solution Approach 2:
The patent implements preliminary failure detection and notification mechanisms where the relay apparatus proactively monitors backhaul link status and sends failure notifications before complete service disruption occurs. This preliminary action enables the network to prepare alternative routes and maintain service continuity, reducing the impact of failures without requiring complex real-time reconfiguration.
2Reliability
If failure detection and notification mechanisms are implemented, then system reliability and rapid response are improved, but communication protocol complexity and signaling overhead increase
Solution Approach 1:
The patent applies local quality by implementing failure detection and notification at the specific level of individual backhaul links between relay apparatus and network nodes, rather than requiring system-wide complex monitoring. Each relay apparatus independently monitors its own backhaul links to master and secondary nodes, sending targeted failure notifications only when needed, which simplifies the overall protocol while maintaining high reliability.
Solution Approach 2:
The relay apparatus performs self-service failure detection by autonomously monitoring its own backhaul link status and generating failure notifications without requiring external polling or complex centralized monitoring systems. This self-service approach reduces signaling overhead and protocol complexity while ensuring rapid failure detection and notification to the network.
3Reliability
If RRC reestablishment procedures are initiated upon failure detection, then service continuity is improved, but communication interruption time and resource allocation overhead increase
Solution Approach 1:
The patent implements preliminary actions by pre-configuring alternative communication paths and maintaining connection states with both master and secondary nodes before failures occur. When a backhaul link failure is detected, the relay apparatus can rapidly switch to the pre-configured alternative path or initiate RRC reestablishment with the other node, significantly reducing communication interruption time while ensuring service continuity.
Solution Approach 2:
The patent applies dynamics by enabling the relay apparatus to dynamically switch between master node and secondary node connections based on real-time backhaul link status. This dynamic connectivity allows the system to adaptively maintain service continuity by transitioning to alternative paths during failures, reducing communication interruption time while managing resource allocation efficiently.
Data Source
AI summary
A communication control method used in a mobile communication system in which at least one communication path is formed between a user equipment and a donor apparatus by using a plurality of relay apparatuses. The communication control method comprises performing, by a first relay apparatus, dual connectivity communication with master and secondary nodes; receiving from the master node, by the first relay apparatus, a first failure notification on a failure of a backhaul link between an upper apparatus of the master node and the master node; after receiving the first failure notification, receiving from the secondary node, by the first relay apparatus, a second failure notification on a failure of a backhaul link between an upper apparatus of the secondary node and the secondary node; after receiving the first and second failure notifications, initiating a procedure for an RRC reestablishment.