Invention Grant
- Patent Title: Communication system, communication terminal apparatus and wireless key apparatus
- Patent Title (中): 通信系统,通信终端装置和无线键设备
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Application No.: US11170564Application Date: 2005-06-29
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Publication No.: US07668556B2Publication Date: 2010-02-23
- Inventor: Minoru Yokoshi , Mitsuyoshi Yasuda , Katsutoshi Itoh , Makoto Natori , Osamu Yoshimura , Takeshi Itagaki
- Applicant: Minoru Yokoshi , Mitsuyoshi Yasuda , Katsutoshi Itoh , Makoto Natori , Osamu Yoshimura , Takeshi Itagaki
- Applicant Address: JP Tokyo
- Assignee: Sony Ericsson Mobile Communications Japan, Inc.
- Current Assignee: Sony Ericsson Mobile Communications Japan, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Frommer Lawrence & Haug LLP
- Agent William S. Frommer; Thomas F. Presson
- Priority: JPP2004-195060 20040630
- Main IPC: H04W24/00
- IPC: H04W24/00

Abstract:
A communication system including a communication terminal apparatus and a wireless key apparatus in wireless communication is provided. The communication terminal apparatus includes a first communication unit operable to receive a first wireless signal, and a first control unit operable to determine a distance between the communication terminal apparatus and the wireless key apparatus based on the received first wireless signal, wherein the first control unit limits a predetermined function of the communication terminal apparatus based on determining the distance. The wireless key apparatus includes a second communication unit operable to receive a second wireless signal, and a second control unit operable to determine the distance between the communication terminal apparatus and the wireless key apparatus based on the received second wireless signal, whereby the second control unit decreases transmission power associated with the second communication unit based on the determined distance.
Public/Granted literature
- US20060003788A1 Communication system, communication terminal apparatus and wireless key apparatus Public/Granted day:2006-01-05
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