Multi-Hop Conditional Handover for Sequential Cell Transitions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Legacy LTE/NR handover systems face high likelihoods of radio link failures and handover failures due to the reliance on measurement reports, which can lead to inefficient and unpredictable handover processes.
Innovation Solution
Implementing multi-hop conditional handovers with configured relationships between handover configurations, allowing the wireless transmit/receive unit (WTRU) to monitor and execute handover commands sequentially based on predefined criteria and validity times, ensuring smoother transitions across multiple target cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy LTE/NR handover systems rely on measurement reports to trigger handovers, then handover decisions are based on actual signal conditions, but the process becomes unpredictable and prone to radio link failures and handover failures
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple handover target cells and their associated triggering conditions before the actual handover is needed. The network prepares a list of candidate target cells with predefined criteria (such as signal strength thresholds or neighbor relationship conditions), so that when handover becomes necessary, the WTRU can quickly select and execute the appropriate target without delay or uncertainty.
2Reliability
If the network prepares multiple handover target cells with predefined conditions, then handover becomes more reliable and controlled, but the system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the handover process into distinct segments: each target cell is configured as a separate entity with its own specific triggering conditions and handover parameters. This allows the network to manage multiple handover options independently, making the overall system more reliable while keeping individual configurations manageable and structured.
3Productivity
If the WTRU monitors multiple triggering conditions for different target cells simultaneously, then proactive handover execution is enabled, but the processing burden on the WTRU increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure and transmit the list of target cells and their triggering conditions to the WTRU in advance. This eliminates the need for the WTRU to continuously monitor and evaluate all possible handover scenarios from scratch, reducing its processing energy while still enabling proactive handover execution when conditions are met.
Data Source
AI summary
A system and method for multi-hop conditional handovers are disclosed. In the system and method a WTRU may be configured plurality of conditional reconfigurations with an implicit or explicit relationship between the conditional reconfigurations. The WTRU behavior related to the handling of reconfigurations is based on the relationship between the configurations. The WTRU may be configured with a multi-hop CHO, where a CHO configuration to a first target cell is associated with another CHO configuration to a second target cell, which can also be further associated with yet another CHO configuration to a third target cell, and so on. On the fulfillment of a CHO configuration at the first hop, the WTRU executing the associated HO command, connecting to the first target, and staring to monitor the triggering conditions for the CHO configurations at the second hop that are associated with the first target.