Cell Size Scaling for Wireless Mobility Management
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Solution Overview
Problem
Existing mobility management techniques fail to accurately determine the mobility state of wireless communication devices during inter-RAT cell switches, leading to non-optimal performance and increased connection drops due to differences in cell sizes and reset mobility parameters.
Innovation Solution
A method that involves determining the size of cells involved in a switch and scaling mobility parameters based on these sizes, allowing for accurate mobility management and continuous parameter application across cell switches, including inter-RAT transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell switch count is used to determine mobility state, then mobility management can be performed, but the count value differs much between scenarios with many small cells versus mainly large cells, leading to inaccurate mobility state determination
Solution Approach 1:
The patent introduces a cell size parameter (Scell) to modify the mobility determination process. The cell size is determined based on signal characteristics (e.g., path loss, signal strength) and used to scale the cell switch count or adjust thresholds. This parameter change allows the system to adapt mobility state determination to different cell size scenarios, resolving the contradiction between measurement accuracy and network adaptability.
2Reliability
If mobility parameters are reset after inter-RAT cell switch, then the system can start fresh in the new RAT, but the device loses mobility state information and cannot maintain optimal performance across RAT transitions
Solution Approach 1:
The patent performs preliminary assessment of the new RAT cell characteristics (signal strength, path loss, cell size) immediately after cell switch. Based on this preliminary information, the device determines whether to reset mobility parameters or maintain/transfer the existing mobility state. This preliminary action allows the system to make informed decisions about parameter continuity, reducing connection drops while avoiding unnecessary parameter resets that would delay mobility state detection.
3Productivity
If a device camps on micro/pico cells in high mobility state, then the device can access high capacity cells, but the device will experience frequent cell switches and service loss
Solution Approach 1:
The patent applies different mobility management strategies based on local conditions (cell size, device speed, signal characteristics). Instead of a uniform approach, the system determines cell size locally using signal measurements and applies appropriate mobility parameters specific to that cell's characteristics. This local quality approach allows high mobility devices to avoid micro/pico cells when appropriate while enabling low mobility devices to camp on high-capacity small cells, thus resolving the contradiction between productivity and reliability.
Data Source
AI summary
A mobility management method of a wireless communication device is disclosed. The method comprises receiving a first signal related to a first cell, determining a size of the first cell based on the first signal, receiving a second signal related to a second cell, and determining a size of the second cell based on the second signal. The method further comprises scaling at least one mobility parameter based on the determined sizes of the first and second cells, and performing mobility management in the second cell based on the scaled mobility parameters. Corresponding computer program product, arrangement and devices are also disclosed.