Title:
通信システム、並びにメモリカード
Document Type and Number:
Japanese Patent JP4544263
Kind Code:
B2
Abstract:
Disclosed herein is a communications system in which a transponder having no radio wave generating source executes data transmission with a reader/writer. The transponder is incorporated in a memory card having a memory with which the reader/writer reads and writes information the memory card being used as loaded in a dedicated slot of a host device. The reader/writer transmits a beacon signal telling a service area at a predetermined time interval. The memory card waits for a beacon signal from the reader/writer within a preset period of time after the host device loaded with the memory card is powered on, executes a connection establishment procedure with the reader/writer upon reception of the signal within the preset period of time and, if the beacon signal has not been received within die preset period of time, enters a sleep state in which at least a wait state of the transponder is stopped.
Inventors:
Kunio Fukuda
Application Number:
JP2007122121A
Publication Date:
September 15, 2010
Filing Date:
May 07, 2007
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04B1/59; H04B5/02
Domestic Patent References:
| JP2006216011A | ||||
| JP2006173691A | ||||
| JP2196390A | ||||
| JP2006229558A | ||||
| JP2006350861A | ||||
| JP2002259924A | ||||
| JP2006174143A |
Foreign References:
| WO2006040829A1 |
Attorney, Agent or Firm:
Masaaki Miyata
Eiji Yamada
Eiji Sasaki
Toshio Sawada
Eiji Yamada
Eiji Sasaki
Toshio Sawada