Adaptive communication in an electronic toll collection system
First Claim
1. An adaptive communication system for communicating with a transponder located in a moving vehicle travelling on a roadway, the transponder having a transponder memory to store configuration type data, the system comprising:
- at least one antenna having a coverage area that includes at least a portion of the roadway, the at least one antenna to receive an RF signal modulated by the configuration type data from the transponder memory;
a system memory having a database stored thereon, the database listing at least one predetermined communication parameter for each of at least two types of configurations; and
a control device connected to the at least one antenna and the system memory, the control device to demodulate the RF signal to obtain the configuration type data, to identify, based on the configuration type data, the predetermined communication parameters corresponding to the configuration type data, and to subsequently adjust at least one variable communication parameter based on the predetermined communication parameters identified based on the received configuration type data.
1 Assignment
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Accused Products
Abstract
An adaptive communication system and method for use in an electronic toll collection system utilizing transponders located in vehicles travelling on a toll roadway. A transponder memory stores configuration type data that identifies the type of the vehicle carrying the transponder, the transponder or the transponder'"'"'s mounting. The transponder transmits the configuration type data to the communication system. The communication system includes a memory which contains a database of predetermined communication parameters for various types of configuration types. The communication system looks up the predetermined communication parameters for the configuration type and adjusts variable communication parameters accordingly. Predetermined communication variables may include the transmit power of an antenna, or the receive sensitivity of the antenna or the position of the vehicle in order to maximize the likelihood of a successful communication.
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Citations
27 Claims
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1. An adaptive communication system for communicating with a transponder located in a moving vehicle travelling on a roadway, the transponder having a transponder memory to store configuration type data, the system comprising:
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at least one antenna having a coverage area that includes at least a portion of the roadway, the at least one antenna to receive an RF signal modulated by the configuration type data from the transponder memory; a system memory having a database stored thereon, the database listing at least one predetermined communication parameter for each of at least two types of configurations; and a control device connected to the at least one antenna and the system memory, the control device to demodulate the RF signal to obtain the configuration type data, to identify, based on the configuration type data, the predetermined communication parameters corresponding to the configuration type data, and to subsequently adjust at least one variable communication parameter based on the predetermined communication parameters identified based on the received configuration type data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of adjusting at least one variable communication parameter in a system for communicating with a transponder, the transponder being located in a moving vehicle travelling in a roadway, the transponder having a transponder memory for storing configuration type data, the communication system having at least one antenna having a coverage area that includes at least a portion of the roadway and a system memory having a database stored thereon, the database listing at least one predetermined communication parameter for each of at least two configuration types, the method comprising:
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receiving at the antenna an RF signal modulated by the configuration type data from the transponder memory; demodulating the RF signal to obtain the configuration type data; looking up in the database a first one of the at least one predetermined communication parameters that corresponds to the received configuration type data; and adjusting at least one of the variable communication parameters for the communication system based on the first predetermined communication parameter. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification