Sidelink Relay Handover Interruption Reduction
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Solution Overview
Problem
Current mobile communication systems face challenges in reducing handover interruption time, particularly due to reliance on successful random access and radio link quality of the source cell, which can lead to increased service disruptions during handovers.
Innovation Solution
Implementing sidelink communication by allowing user equipment to exchange data with a target cell via a relay node before completing the random access procedure, decoupling data transmission from the handover execution and reducing reliance on the source cell's radio link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedure is used with reliance on random access and source cell radio link quality, then handover can be completed, but handover interruption time increases and service reliability decreases
Solution Approach 1:
The patent applies preliminary action by establishing a sidelink connection with the target cell before the actual handover execution. The user equipment pre-establishes communication pathways through relay nodes and performs necessary signaling procedures in advance, so that when handover is triggered, data transmission can continue without waiting for random access completion. This decouples the handover execution from the data transmission establishment, significantly reducing interruption time and enhancing service reliability.
2Loss of time
If data transmission is coupled with random access procedure completion, then transmission reliability is ensured, but handover interruption time increases
Solution Approach 1:
The patent introduces relay nodes as intermediaries to facilitate data transmission during handover. Instead of requiring direct communication with the target cell through random access, the user equipment uses relay nodes (first relay node and second relay node) to forward data packets. These relay nodes act as mediators that bridge the gap between the source cell and target cell, enabling data transmission to proceed independently of random access completion status, thus reducing handover interruption time while maintaining transmission reliability through the relay infrastructure.
3Ease of operation
If reliance on source cell radio link quality is maintained, then handover decision is simple, but service disruption increases during handover
Solution Approach 1:
The patent applies preliminary action by pre-establishing sidelink connections and preparing relay node configurations before handover execution. The network and user equipment perform advance signaling, resource allocation, and path setup through relay nodes, so that when handover is triggered, the infrastructure is already in place to receive and forward data packets immediately. This eliminates the need to wait for random access completion and source cell link verification, significantly reducing service disruption time while maintaining relatively simple handover decision mechanisms.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for reducing handover interruption time using sidelink communication are provided. For example, the handed-over (remote) user equipment may exchange uplink and downlink data with the target cell via the additional or assisting link to another relay user equipment while the remote user equipment performs the random access procedure (random access channel procedure) and may establish its own direct radio link to the target cell.