Wireless Handover Using Pre-Measured Neighbor Data
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Solution Overview
Problem
Conventional handover procedures in wireless communication networks often fail to perform a timely handover when a mobile station moves out of the coverage of a relay station, leading to disconnection due to power interference and signal degradation, especially when the mobile station is in a vehicle.
Innovation Solution
A method for performing a handover in a wireless multi-hop communication network involves requesting and obtaining neighborhood communication information about channel conditions between access stations, configuring the mobile station based on this information to switch to a new station, and utilizing uplink synchronization to facilitate a contention-free handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover procedures are used, then the network can maintain basic connectivity, but the handover latency is too high and the mobile station cannot transition in time to avoid disconnection
Solution Approach 1:
The patent applies preliminary action by having the mobile station perform scanning and measure signal strength of neighboring base stations in advance before actual handover is needed. The measurement report is prepared and stored beforehand, so when handover becomes necessary, the mobile station can immediately transition without performing measurements at the moment of handover, thus reducing handover latency while maintaining connectivity reliability.
2Reliability
If the mobile station performs scanning processes to find the best target station, then the handover can be optimized for signal quality, but the scanning process increases handover latency and may cause disconnection
Solution Approach 1:
The mobile station performs scanning and measures signal strength of neighboring base stations in advance and stores the measurement report. When handover is needed, the pre-measured information is used immediately without re-scanning, optimizing signal quality selection while eliminating the time-consuming scanning process at the critical handover moment.
Solution Approach 2:
The mobile station autonomously performs scanning and measurement procedures independently, preparing its own handover decision basis without requiring continuous network control. This self-service approach allows the mobile station to quickly execute handover based on pre-collected information, reducing latency while maintaining optimal signal quality.
3Measurement precision
If the mobile station uses GPS positioning equipment to facilitate hard handover, then the handover can be triggered at precise locations, but additional positioning devices and databases are required increasing system complexity
Solution Approach 1:
The patent extracts the positioning function from complex external systems like GPS. Instead of requiring GPS receivers and large databases, the mobile station uses its own scanning capabilities and pre-stored measurement reports to determine optimal handover targets based on signal strength and neighboring base station information, achieving sufficient location awareness without additional positioning hardware.
Solution Approach 2:
The mobile station performs self-based location awareness through autonomous scanning and measurement of neighboring base stations. It uses its own resources (scanner, measurement functions) to gather positioning information without external assistance, eliminating the need for GPS equipment and complex positioning databases while maintaining adequate precision for handover decisions.
4Area of stationary object
If relay stations are deployed to extend coverage and improve transmission rate, then the network coverage is extended, but fast handover from relay station to outside base station becomes more difficult when passengers get off the vehicle
Solution Approach 1:
The mobile station performs scanning and measures signal strength of neighboring base stations in advance while connected to the relay station. The measurement report is prepared and stored beforehand, so when the passenger gets off the vehicle and handover becomes necessary, the mobile station can immediately transition to the pre-identified target base station without delay, ensuring reliable handover while maintaining extended coverage capability.
Data Source
AI summary
A method of performing a handover process in a wireless multi-hop communication network, the method comprising requesting neighborhood communication information regarding channel condition among access stations in the neighborhood of a mobile station, the neighborhood communication information including communication information related to a link between a first station and a second station in the wireless multi-hop communication network, obtaining the communication information related to the link between the first station and the second station, sending the communication information from the first station to a mobile station in the wireless multi-hop communication network, and configuring the mobile station based on the communication information so as to switch the mobile station to the second station.