Radio communication system using variable packet length
First Claim
1. A radio communication system comprising a terminal station installed on a mobile object and a plurality of base stations provided along a traveling route of the mobile object, each of the base stations forming a limited communication area and performing radio communication with the terminal station which is in the corresponding communication area,wherein if data transmission between a base station and a terminal station cannot be completed in one communication area corresponding to the base station, data is divided and transmitted in a plurality of communication areas corresponding to base stations arranged in a traveling direction of the mobile object, and wherein a mobile object traveling speed is detected, and data transmission is performed using a packet of an appropriate length according to the detected mobile object traveling speed.
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Accused Products
Abstract
A radio communication system performs radio communication between a terminal station installed on a vehicle and a plurality of base stations provided along a roadside. The system detects a vehicle traveling speed in each communication area formed by each base station. The vehicle traveling speed is detected by a method which uses radio communication between the terminal station and the base stations. The time of the vehicle stay in the communication area is estimated based on the detected vehicle traveling speed, and the length of a packet is determined based on the estimated time of the vehicle stay in the communication area. In this way, the present system performs data transmission using a packet of an appropriate length according to the detected vehicle traveling speed.
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Citations
9 Claims
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1. A radio communication system comprising a terminal station installed on a mobile object and a plurality of base stations provided along a traveling route of the mobile object, each of the base stations forming a limited communication area and performing radio communication with the terminal station which is in the corresponding communication area,
wherein if data transmission between a base station and a terminal station cannot be completed in one communication area corresponding to the base station, data is divided and transmitted in a plurality of communication areas corresponding to base stations arranged in a traveling direction of the mobile object, and wherein a mobile object traveling speed is detected, and data transmission is performed using a packet of an appropriate length according to the detected mobile object traveling speed.
Specification