发明名称 |
In-vehicle communication system, mobile device, communication system, and communication method |
摘要 |
An in-vehicle device stores a Wake Up pattern, which notifies a mobile device of a start of communication, in an area before a data storage area of a frame and transmits the frame, the mobile device includes a modulation/demodulation circuit and a microcomputer that perform a predetermined reception process on a reception signal, a pattern determination circuit that, when the reception signal includes a Wake Up pattern, determines to start communication and activates the modulation/demodulation circuit and the microcomputer, a power detection circuit that detects power of the reception signal, and, when power is detected for a certain period of time or longer, activates the pattern determination circuit, and a Wake-Up control unit that activates the power detection circuit for a predetermined time with a constant period during a time period other than during communication. |
申请公布号 |
US9430890(B2) |
申请公布日期 |
2016.08.30 |
申请号 |
US201214359769 |
申请日期 |
2012.10.10 |
申请人 |
Mitsubishi Electric Corporation |
发明人 |
Ochiai Mari;Taira Akinori |
分类号 |
G08B19/00;G07C9/00;B60R25/24;B60R25/40;H04W52/02;H04W76/04 |
主分类号 |
G08B19/00 |
代理机构 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. A reader of a communication system comprising the reader and a tag that includes a reception processor that performs a reception process on a signal transmitted from the reader and that sets the reception processor to an activated state for a certain period of time with an intermittent operation period T, wherein
the reader transmits a transmission frame, which includes a preamble with a length of T/N (N is an integer equal to or larger than 2) and transmission data with a length shorter than T/N, N times within a time 2T such that transmission times do not overlap with each other. |
地址 |
Tokyo JP |