US 9,811,961 B2
Vehicular near field communication system, portable device, and on-board instrument
Jun Fujiyama, Kanagawa (JP); Masami Takigawa, Kanagawa (JP); and Naoki Hayashi, Kanagawa (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Sep. 6, 2016, as Appl. No. 15/256,736.
Application 15/256,736 is a continuation of application No. PCT/JP2014/004969, filed on Sep. 29, 2014.
Claims priority of application No. 2014-059893 (JP), filed on Mar. 24, 2014.
Prior Publication US 2016/0371906 A1, Dec. 22, 2016
Int. Cl. G05B 19/00 (2006.01); G07C 9/00 (2006.01); B60R 25/10 (2013.01); B60R 25/24 (2013.01); H04B 5/00 (2006.01)
CPC G07C 9/00309 (2013.01) [B60R 25/10 (2013.01); B60R 25/245 (2013.01); G07C 2009/00769 (2013.01); G07C 2209/63 (2013.01); H04B 5/0056 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A vehicular near field communication system comprising:
an on-board instrument having a vehicle-exterior antenna and a vehicle-interior antenna, the on-board instrument being mounted in a vehicle; and
a portable device performing radio communications with the on-board instrument,
the portable device comprising
receiver for receiving a first signal transmitted from the vehicle-exterior antenna and a second signal transmitted from the vehicle-interior antenna,
measure for measuring a first received signal strength from the first signal and a second received signal strength from the second signal,
offset adder for adding an offset to the second received signal strength, and
transmitter for transmitting a response signal to the on-board instrument in accordance with the first received signal strength and the second received signal strength added with the offset.