Remote keyless entry system with two-way long range communication
First Claim
1. A method of transmitting vehicle information from a base station mounted in a vehicle to a portable RKE fob via a radio-frequency signal within a specified average field strength limit, said method comprising the steps of:
- forming a multi-byte vehicle message;
coding said vehicle message into a multi-bit coded message;
framing said multi-bit coded message into a plurality of packets, wherein each packet corresponds to a respective portion of said vehicle message;
wirelessly transmitting said radio-frequency signal from said base station with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of said plurality of packets, wherein said radio-frequency signal within each of said packet windows has a predetermined field strength greater than said average field strength limit and a substantially zero field strength between said packet windows, and wherein said predetermined duty cycle results in an actual average field strength for transmitting all of said packets not exceeding said average field strength limit;
receiving said plurality of packets within said portable RKE fob; and
recovering said vehicle message in response to said received plurality of packetswherein said radio-frequency signal is transmitted within a specified peak field strength limit which is a predetermined decibel level above said average field strength limit, and wherein said predetermined duty cycle corresponds to said predetermined decibel level; and
wherein said predetermined duty cycle has a ratio of one-half of a packet window width to a packet period which is substantially equal to a reciprocal of a ratio of said peak field strength limit to said average field strength limit.
2 Assignments
0 Petitions
Accused Products
Abstract
Vehicle information (e.g., status information, calibratable parameters, or diagnostic data) is transmitted from a base station mounted in a vehicle to a portable RKE fob via a radio-frequency signal within a specified average field strength limit. A multi-byte vehicle message is formed and then coded into a multi-bit coded message. The multi-bit coded message is framed into a plurality of packets. The radio-frequency signal is wirelessly transmitted from the base station with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of the plurality of packets. The radio-frequency signal within each of the packet windows has a predetermined field strength greater than the average field strength limit and a substantially zero field strength between the packet windows. The predetermined duty cycle results in an actual average field strength for transmitting all of the packets not exceeding the average field strength limit.
-
Citations
14 Claims
-
1. A method of transmitting vehicle information from a base station mounted in a vehicle to a portable RKE fob via a radio-frequency signal within a specified average field strength limit, said method comprising the steps of:
-
forming a multi-byte vehicle message; coding said vehicle message into a multi-bit coded message; framing said multi-bit coded message into a plurality of packets, wherein each packet corresponds to a respective portion of said vehicle message; wirelessly transmitting said radio-frequency signal from said base station with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of said plurality of packets, wherein said radio-frequency signal within each of said packet windows has a predetermined field strength greater than said average field strength limit and a substantially zero field strength between said packet windows, and wherein said predetermined duty cycle results in an actual average field strength for transmitting all of said packets not exceeding said average field strength limit; receiving said plurality of packets within said portable RKE fob; and recovering said vehicle message in response to said received plurality of packets wherein said radio-frequency signal is transmitted within a specified peak field strength limit which is a predetermined decibel level above said average field strength limit, and wherein said predetermined duty cycle corresponds to said predetermined decibel level; and wherein said predetermined duty cycle has a ratio of one-half of a packet window width to a packet period which is substantially equal to a reciprocal of a ratio of said peak field strength limit to said average field strength limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A vehicle base station in a vehicle for wirelessly transmitting a radio frequency signal to a portable fob, said radio-frequency signal being broadcast within a specified average field strength limit, said station comprising:
-
a message controller for forming a multi-byte vehicle message, coding said vehicle message into a multi-bit coded message, and framing said multi-bit coded message into a plurality of packets, wherein each packet corresponds to a respective portion of said vehicle message; and a transceiver for wirelessly transmitting said radio-frequency signal from said base station with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of said plurality of packets, wherein said radio-frequency signal within each of said packet windows has a predetermined field strength greater than said average field strength limit and a substantially zero field strength between said packet windows, and wherein said predetermined duty cycle results in an actual average field strength for transmitting all of said packets not exceeding said average field strength limit;
whereinsaid transceiver transmits said radio-frequency signal within a specified peak field strength limit which is a predetermined decibel level above said average field strength limit, and said predetermined duty cycle corresponds to said predetermined decibel level; and said predetermined duty cycle has a ratio of one-half of a packet window width to a packet period which is substantially equal to a reciprocal of a ratio of said peak field strength limit to said average field strength limit. - View Dependent Claims (12)
-
-
13. A method of transmitting information from a portable RKE fob to a base station mounted in a vehicle via a radio-frequency signal within a specified average field strength limit, said method comprising:
-
forming a multi-byte fob message; coding said fob message into a multi-bit coded message; framing said multi-bit coded message into a plurality of packets, wherein each packet corresponds to a respective portion of said fob message; wirelessly transmitting said radio-frequency signal from said fob with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of said plurality of packets, wherein said radio-frequency signal has within each of said packet windows a predetermined field strength greater than said average field strength limit and has a substantially zero field strength between said packet windows, and wherein said predetermined duty cycle results in an actual average field strength for transmitting all of said packets not exceeding said average field strength limit; receiving said plurality of packets within said base station; and recovering said fob message in response to said received plurality of packets; wherein said radio-frequency signal is transmitted within a specified peak field strength limit which is a predetermined decibel level above said average field strength limit, and wherein said predetermined duty cycle corresponds to said predetermined decibel level; and wherein said predetermined duty cycle has a ratio of transmission on time of a packet window width to a packet period greater than or equal to a reciprocal of a ratio of said peak field strength limit to said average field strength limit.
-
-
14. A portable fob for wirelessly transmitting a radio-frequency signal to a base station in a vehicle, said radio-frequency signal being broadcast within a specified average field strength limit, said fob comprising:
-
a message controller for forming a multi-byte fob message, coding said fob message into a multi-bit coded message, and framing said multi-bit coded message into a plurality of packets, wherein each packet corresponds to a respective portion of said fob message; and a transceiver for wirelessly transmitting said radio-frequency signal from said fob with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of said plurality of packets, wherein said radio-frequency signal has within each of said packet windows a predetermined field strength greater than said average field strength limit and has a substantially zero field strength between said packet windows, and wherein said predetermined duty cycle results in an actual average field strength for transmitting all of said packets not exceeding said average field strength limit; wherein said transceiver transmits said radio-frequency signal within a specified peak field strength limit which is a predetermined decibel level above said average field strength limit, and said predetermined duty cycle corresponds to said predetermined decibel level; and said predetermined duty cycle has a ratio of transmission on time of a packet window width to a packet period greater than or equal to a reciprocal of a ratio of said peak field strength limit to said average field strength limit.
-
Specification