Radio Wave Map Reply for Stable Base Station Handover
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Solution Overview
Problem
Existing techniques for reducing base station switching frequency in wireless communication for moving objects, such as vehicles, fail to prevent the switching itself, leading to unstable communication when handovers occur.
Innovation Solution
A radio wave map provision device that stores and transmits information including reference positions, communication speeds, and connection probabilities, allowing for the calculation of a lowest guaranteed speed and estimated speed, which helps determine unstable regions and facilitate stable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base station switching frequency is reduced using existing techniques, then communication stability improves, but base station handover switching cannot be prevented
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing radio wave map information including communication speeds and connection probabilities at various reference positions before handover occurs. This allows the system to predict unstable regions in advance and determine optimal target base stations before switching is necessary, thereby preventing harmful switching while maintaining communication stability.
Solution Approach 2:
The patent implements beforehand cushioning by establishing guaranteed speed thresholds and buffer mechanisms based on pre-acquired radio wave map data. When entering unstable regions, the system uses these pre-established parameters to maintain communication quality during handover, cushioning against the harmful effects of base station switching before they can disrupt communication.
2Measurement precision
If radio wave map information is stored and transmitted for determining unstable regions, then communication control accuracy improves, but system complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting only the essential radio wave map information (communication speeds and connection probabilities at reference positions) needed for unstable region determination, rather than storing complete radio wave characteristics. This selective extraction maintains determination accuracy while reducing system complexity by focusing on the most relevant parameters.
Solution Approach 2:
The patent uses parameter changes by transforming raw radio wave measurement data into standardized map parameters (communication speed, connection probability, reference position) that can be efficiently stored and processed. This parameter transformation simplifies the data structure and reduces complexity while preserving the precision needed for accurate unstable region determination.
Data Source
AI summary
A radio wave map provision device includes a radio wave map storage that stores a radio wave map. The radio wave map includes reference position information indicating a reference position, a communication speed with each external communication device at the reference position, and a connection probability indicating a probability of performing wireless communication with each external communication device at the reference position. The radio wave map provision device: receives the radio wave map request including request position information indicating a request position; obtains a lowest guaranteed speed and an estimated speed, at the reference position, based on the communication speed and the connection probability; and transmits a radio wave map reply including the connection probability, the lowest guaranteed speed, and the estimated speed, at the reference position corresponding to the request position information.