Vehicle Wireless Communication Slot Allocation for Handover
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Solution Overview
Problem
Existing wireless communication technologies between vehicles and roadside devices face challenges in maintaining uninterrupted and high-success-rate communication, particularly in vehicle traveling environments, due to issues like communication collisions, delay, and unsuitable media access control schemes.
Innovation Solution
A method involving a vehicle wireless communication system that includes receiving hand-over-related link information, sending hand-over preparation messages, allocating slots, and transmitting beacon frames with slot allocation information, while performing slot defragmentation to manage communication resources effectively and prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If DSRC employs slotted Aloha-type media access control scheme, then communication collision avoidance is improved, but uninterrupted communication in vehicle traveling environment deteriorates
Solution Approach 1:
The system performs hand-over preparation in advance by allocating time slots for communication between the vehicle and target roadside devices before the vehicle actually moves to the new area. This preliminary slot allocation ensures that communication can continue without interruption when the vehicle hand-overs between coverage areas.
Solution Approach 2:
The media access control scheme is made dynamic by adapting slot allocation to vehicle traveling conditions. The system determines hand-over necessity based on vehicle position and movement, and dynamically allocates communication slots accordingly, rather than using fixed static allocation.
2Speed
If WAVE communication uses CSMA/CA-type media access control, then high-speed traveling environment support is improved, but communication within fixed delay time deteriorates
Solution Approach 1:
The system uses periodic beacon frames that are transmitted at regular intervals to convey slot allocation information to vehicles. This periodic structure provides predictable timing and allows vehicles to know when to expect communication opportunities, ensuring communication within fixed delay times even at high speeds.
Solution Approach 2:
The system introduces a coordinator entity that manages slot allocation and communicates this information through beacon frames. This intermediary coordinates communication between vehicles and roadside devices, managing the timing and allocation to ensure fixed delay requirements are met.
3Device complexity
If slot allocation is performed without considering hand-over link information, then device complexity is reduced, but communication reliability in vehicle traveling environment deteriorates
Solution Approach 1:
The system uses feedback from hand-over-related link information (such as signal strength, vehicle position, and current communication status) to determine optimal slot allocation. This feedback mechanism allows the system to adapt slot allocation to actual traveling conditions, improving communication reliability without requiring overly complex algorithms.
Data Source
AI summary
Disclosed herein is a method of providing vehicle wireless communication. In the method, a vehicle receives hand-over-related link information, which includes slot request information about slots requested by a vehicle to a roadside wireless communication device for hand-over of the vehicle, from a central control server. A hand-over preparation message, which includes the hand-over-related link information, is send to a vehicle wireless communication device connected to the vehicle. It is determined that the vehicle completed preparation for performance of the hand-over when a response message to the hand-over preparation message is received from the vehicle wireless communication device. Slots are allocated in consideration of the hand-over-related link information. Beacon frames, which include slot allocation information about the allocated slots, are transmitted to the vehicle wireless communication device. Accordingly, the vehicle wireless communication device and the roadside wireless communication device can reliably perform communication without interruption.