On-vehicle radio communication equipment, a dedicated short range communication system, and on-vehicle radio communication method
First Claim
1. An on-vehicle dedicated short range communication equipment comprising:
- searching means for performing search for radio frequencies used by a roadside dedicated short range communication equipment with which the on-vehicle dedicated short range communication equipment is going to have a dedicated short range communication; and
establishing means for establishing a link for the dedicated short range communication with said roadside dedicated short range communication equipment at the searched frequencies, wherein said searching means performs the search by cyclically switching radio frequencies from one to another while keeping a ratio that radio frequencies for a first type of communication is searched for larger than a ratio that a radio frequencies for a second type of communication is searched for.
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Accused Products
Abstract
This invention provides a communication connection system for dedicated short range communications capable of successfully operating with respect to a service requiring high speed link connection in an on-vehicle equipment capable of receiving a plurality of services. If a reception side of an on-vehicle searches a plurality of radio frequencies corresponding to respective services in a certain repetition cycle, a search frequency of the radio frequency assigned to the service, such as an ETC service, requiring high speed link connection is set high and a search frequency of the radio frequency assigned to the service, such as a various information providing service or a parking lot management service, capable of being executed with low speed link connection is set low.
21 Citations
13 Claims
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1. An on-vehicle dedicated short range communication equipment comprising:
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searching means for performing search for radio frequencies used by a roadside dedicated short range communication equipment with which the on-vehicle dedicated short range communication equipment is going to have a dedicated short range communication; and
establishing means for establishing a link for the dedicated short range communication with said roadside dedicated short range communication equipment at the searched frequencies, wherein said searching means performs the search by cyclically switching radio frequencies from one to another while keeping a ratio that radio frequencies for a first type of communication is searched for larger than a ratio that a radio frequencies for a second type of communication is searched for. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An on-vehicle dedicated short range communication method comprising:
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a searching step for performing search for radio frequencies used by a roadside dedicated short range communication equipment with which the on-vehicle dedicated short range communication equipment is going to have a dedicated short range communication; and
a establishing step for establishing a link for the dedicated short range communication with said roadside dedicated short range communication equipment at the searched frequencies, wherein said searching step performs the search by cyclically switching radio frequencies from one to another while keeping a ratio that radio frequencies for a first type of communication is searched for larger than a ratio that a radio frequencies for a second type of communication is searched for. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification