Handover Delay Evaluation in Wireless Mobility
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Solution Overview
Problem
In wireless communication systems, there is a challenge in accurately estimating handover delays for user equipment (UE) as it moves between cells, which can lead to latency and interruption in coverage.
Innovation Solution
An apparatus is provided that evaluates the expected handover delay to candidate cells and generates an indication of this delay, which is then transmitted to a network node of the serving cell, allowing the network to make informed handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network selects target cells without visibility of handover delay information, then the handover selection process is simple and fast, but the handover latency increases and mobility performance deteriorates
Solution Approach 1:
The UE evaluates and reports handover delay information to the network in advance, before the actual handover decision is made. This preliminary provision of delay information allows the network to make informed target cell selections that minimize handover latency, while the complexity is shifted to the UE's evaluation and reporting functions rather than the network's selection process
Solution Approach 2:
The UE provides feedback to the network about its specific handover delay characteristics for different candidate cells. This feedback mechanism enables the network to understand the UE's mobility behavior and select target cells that are compatible with the UE's delay requirements, thereby reducing overall handover latency without significantly increasing network-side complexity
2Loss of information
If lower layer triggered mobility is used, then overhead and latency are reduced, but accurate estimation of handover delay becomes more difficult
Solution Approach 1:
The UE performs self-evaluation of its handover delay characteristics for different candidate cells and autonomously reports this information to the network. This self-service approach allows the UE to provide accurate delay measurements without requiring complex network-side measurement and estimation mechanisms, thus reducing overhead while maintaining measurement precision
Solution Approach 2:
The UE evaluates handover delays to candidate cells in advance and reports this information before the network makes the final handover decision. This preliminary evaluation enables accurate delay estimation without requiring the network to perform complex real-time measurements, reducing both overhead and improving measurement precision
Data Source
AI summary
A user equipment that is configured to evaluate an expected handover delay to at least one of a plurality of candidate cells and to generate an indication of the handover delay and transmit it to a network node of a serving cell is disclosed. This allows the network to take into account handover delays when deciding on how and whether to perform a handover.