Vehicle Wireless Modems for mmWave Communication Reliability
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Solution Overview
Problem
Existing wireless communication systems, particularly Wi-Fi and cellular networks, face challenges in providing high-capacity, reliable communication to fast-moving vehicles due to limitations in air interface resource utilization, mobility support, and complexity, especially in millimeter-wave frequency bands like 60 GHz, which require efficient access point management and resource optimization.
Innovation Solution
A communication system utilizing beamform-based mm-wave radio communication with directional antennas, where wireless modems on vehicles form beams in constrained angular intervals to maintain continuous connections with access points, employing disjoint frequency channels and a data session controller to manage links and ensure seamless handovers, thereby optimizing air interface resource utilization and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If millimeter-wave (60 GHz) directional communication is used to provide high capacity support for fast moving vehicles, then communication capacity and throughput are improved, but mobility support and handover reliability deteriorate due to increased sensitivity to distance, line of sight, and directional changes
Solution Approach 1:
The system segments the communication function by separating access point selection functionality from the access points themselves, placing it in the vehicle's wireless modem. This allows the vehicle to actively manage its own connectivity by selecting and reselecting access points based on signal conditions, thereby maintaining reliable communication despite the directional nature and mobility challenges of mmWave technology.
Solution Approach 2:
The system implements dynamic access point selection where the vehicle's wireless modem continuously monitors and selects the optimal access point based on current communication conditions. This dynamic approach allows the system to adapt to changing line-of-sight conditions, distance variations, and directional requirements inherent in fast-moving vehicle scenarios, maintaining both high capacity and reliability.
2Reliability
If conventional Wi-Fi handover mechanisms are used to support vehicle mobility, then some mobility support is provided, but data rate and handover speed deteriorate due to slow handovers and interruptions in data connectivity
Solution Approach 1:
The system performs preliminary actions by having the wireless modem continuously monitor available access points and pre-select optimal targets before handover is needed. This proactive approach allows for faster, interruption-free handovers compared to conventional Wi-Fi systems that react to signal degradation, thereby maintaining both mobility support and high data rates during vehicle movement.
3Productivity
If a significant amount of air interface resource (spectrum) is allocated to support high capacity communication with fast moving vehicles, then communication capacity is improved, but resource efficiency and system complexity worsen due to restrictions in frequently used frequency ranges
Solution Approach 1:
The system implements self-service by enabling the vehicle's wireless modem to autonomously select and manage access points without requiring complex centralized resource management. This distributed approach allows high capacity communication to be achieved while reducing overall system complexity, as each vehicle independently manages its own connectivity rather than requiring sophisticated network-wide resource allocation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves improved reliability, flexibility, and performance in maintaining continuous communication for fast-moving vehicles by efficiently managing access points and air interface resources, reducing data interruption, and enhancing resource utilization without increasing complexity.
Implementation Method 1
A communication system utilizing beamform-based mm-wave radio communication with directional antennas, where wireless modems on vehicles form beams in constrained angular intervals to maintain continuous connections with access points
Data Source
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AI summary
A communication system supports communication between an end node of a vehicle and a remote correspondent node via a fixed network which comprises a plurality of wireless access points with a directional antenna arrangement for mm wave radio communication using directional beams. A vehicle comprises wireless modems employing electronically steerable beamforming directional antennas for establishing mm wave radio communication links to the access points. The access points communicate in a frequency channel alternately selected from one of two disjoint sets and a first wireless modem (111) is constrained to communicate using a frequency channel from the first set and a second wireless modem (701) is constrained to communicate using a frequency channel from the first set. A data session controller (705, 713) communicates data of the data session over links provided by the first wireless modem (111) and the second wireless modem (701).