IC memory card type radio modem

• US 5,617,449 A
• Filed: 06/22/1995
• Issued: 04/01/1997
• Est. Priority Date: 06/27/1994
• Status: Expired due to Term

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Tanaka, Masahiko
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Kim, Kevin
• Application Number:
  US08/493,428
• Time in Patent Office: 649 Days
• Field of Search: 375/219, 375/220, 375/222, 455/33.3, 455/33.1, 455/33.2, 379/60, 379/58, 379/59
• US Class Current: 375/222
• CPC Class Codes: H04B 1/3827 Portable transceivers
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

An IC memory card type radio modem includes a connecting portion, a radio section, a radio interface unit section, a channel selection circuit section, a terminal interface unit section, and a control section. The connecting portion can be connected to a PC card portion of a portable information processing device. The radio section is adaptable to at least one type of radio infrastructure. The radio interface unit section is adapted to the radio section. The channel selection circuit section is connected to the radio interface unit section. The terminal interface unit section is connected to the channel selection circuit section. The control section controls the plurality of radio sections. The radio interface unit section is controlled to always switch to a radio infrastructure which can perform communication.

Claims

1. An IC memory card type radio modem comprising:

a connecting portion which can be connected to a PC card portion of a portable information processing device;

a radio section adaptable to at least one type of radio infrastructure;

a radio interface unit section adapted to said radio section;

a channel selection circuit section connected to said radio interface unit section;

a terminal interface unit section to be connected to said channel selection circuit section;

a control section for controlling said plurality of radio sections, wherein said radio interface unit section is controlled to always switch to a radio infrastructure which can perform communication; and

detection means for detecting a reception state of said radio section, and wherein when said detection means determines that communication cannot be continued, said radio interface unit section is controlled to switch a currently used radio infrastructure to a radio infrastructure which can perform communication.

2. An IC memory card type radio modem comprising:

a connecting portion which can be connected to a PC card portion of a portable information processing device;

a radio section adaptable to at least one type of radio infrastructure;

a radio interface unit section adapted to said radio section;

a channel selection circuit section connected to said radio interface unit section;

a terminal interface unit section to be connected to said channel selection circuit section; and

a control section for controlling said plurality of radio sections, wherein said radio interface unit section is controlled to always switch to a radio infrastructure which can perform communication;

wherein simultaneous communication can be performed with respect to a plurality of addresses of said at least one type of radio infrastructure by performing simultaneous connection to a plurality of channels with respect to the plurality of addresses.