Mobile Relay Handover via Preliminary Capability Verification
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Solution Overview
Problem
Current 3GPP LTE-Advanced relay architectures are designed for stationary relays and do not effectively manage mobile relays, leading to challenges in maintaining quality of service and reliability during handovers, especially in scenarios like high-speed vehicles where handover latency and failure rates are high.
Innovation Solution
The method involves a source network node managing a mobile relay node by ensuring a target network node is capable of supporting it, sending a handover request, establishing an interface, and detaching the relay from the source node without waiting for acknowledgement, allowing for seamless handover and minimizing latency and QoS impact on user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the relay node is mobile and moves relative to the source network node, then the relay can serve moving reference frames (e.g., high-speed vehicles), but the handover latency increases and handover reliability deteriorates
Solution Approach 1:
The source network node sends a handover request to the target network node before the relay node actually needs to hand over. This preliminary action allows the target node to prepare resources and confirm capability in advance, reducing handover latency and improving reliability for mobile relays serving high-speed vehicles.
Solution Approach 2:
The patent implements dynamic handover management where the source network node proactively monitors relay node mobility and triggers handover procedures based on movement conditions. The system dynamically adjusts handover timing and selects target nodes based on current mobility state, enabling reliable service continuity for moving reference frames.
2Reliability
If the source network node waits for acknowledgement before detaching the relay node, then handover reliability improves, but handover latency increases
Solution Approach 1:
The source network node sends the handover request to the target network node in advance and initiates the detachment process without waiting for the acknowledgement. This preliminary action approach allows the handover to proceed while the target node prepares, reducing latency while maintaining reliability through the pre-sent request.
Solution Approach 2:
The handover process continues without interruption by detaching the relay node from the source node immediately after sending the handover request, rather than waiting for confirmation. This continuous action ensures minimal service interruption while the target node completes its preparation in parallel.
3Speed
If the target network node is not pre-verified for capability, then handover speed improves, but handover success rate deteriorates
Solution Approach 1:
The source network node verifies the target network node's capability to support mobile relays before initiating the handover. This preliminary verification ensures the target node can accept the mobile relay, improving success rate while maintaining fast handover by having the verification completed before the actual handover execution.
Data Source
AI summary
A method and relay node for managing a relay node that is moving relative to a source network node, the method receiving parameters of a target network node from a source network node at the relay node; initiating a direct attachment of the relay node to the target network node; and detaching the relay node from the source network node. Also, a method and network node for managing a relay node that is moving relative to a source network node, the method sending a handover request of a relay node from the source network node to a target network node; performing handover of a plurality of user equipments (UEs) from the source network node to the target network node, wherein the plurality of UEs are attached to the relay node, and establishing an interface between the relay node and the target network node.