US 9,813,170 B2
In-vehicle terminal that measures electric field strengths of radio waves from information terminals
Kimio Okamoto, Yokohama (JP); Noriyuki Abe, Yokohama (JP); Yusuke Matsumoto, Saitama (JP); Tetsuya Yamada, Chigasaki (JP); and Takuya Fujieda, Tokyo (JP)
Assigned to Clarion Co., Ltd., Saitama-shi (JP)
Filed by Clarion Co., Ltd., Saitama-shi, Saitama (JP)
Filed on Jul. 8, 2016, as Appl. No. 15/205,409.
Claims priority of application No. 2015-137691 (JP), filed on Jul. 9, 2015.
Prior Publication US 2017/0012721 A1, Jan. 12, 2017
Int. Cl. H04B 17/00 (2015.01); H04B 17/318 (2015.01); H04L 29/08 (2006.01); B60N 2/00 (2006.01); B60R 16/037 (2006.01); H04W 4/02 (2009.01); H04W 4/04 (2009.01)
CPC H04B 17/318 (2015.01) [B60N 2/002 (2013.01); B60R 16/037 (2013.01); H04L 67/306 (2013.01); H04L 67/34 (2013.01); H04W 4/023 (2013.01); H04W 4/046 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An in-vehicle terminal, comprising:
a CPU configured to:
measure electric field strengths of radio waves for wireless communication emitted from information terminals located in a vicinity thereof;
identify a predetermined main terminal among the information terminals; and
establish wireless communication with the identified main terminal and transmit strength information of a first electric field for another information terminal than the main terminal measured by the CPU, via the wireless communication to the main terminal;
wherein the CPU measures an electric field strength as one of the electric field strengths of a radio wave emitted from the main terminal when the CPU establishes the wireless communication;
wherein the CPU transmits strength information of a second electric field for the main terminal measured by the CPU, via the wireless communication to the main terminal; and
wherein the CPU receives positional information of the other information terminal calculated by the main terminal, from the main terminal via the wireless communication.