Portable electronic communications device having switchable LAN/WAN wireless communications features

• US 5,903,548 A
• Filed: 12/19/1996
• Issued: 05/11/1999
• Est. Priority Date: 12/19/1996
• Status: Expired due to Term

• Current Assignee: General Dynamics Itronix Corporation (General Dynamics Corporation)
• Original Assignee: Itronix Corp. (General Dynamics Corporation)
• Inventors: Delamater, Jeff
• Primary Examiner(s): VU, HUY DUY
• Application Number:
  US08/769,398
• Time in Patent Office: 873 Days
• Field of Search: 370/338, 370/310, 370/252, 370/241, 370/328, 370/331, 370/332, 370/333, 370/334, 370/351, 370/352, 370/353, 370/354, 370/355, 370/356, 370/400, 370/401, 370/402, 370/403 , 370/404, 370/405, 370/463, 455/436, 455/437, 455/438, 455/439, 455/440, 455/432
• US Class Current: 370/310
• CPC Class Codes: H04L 12/5692 Selection among different networks
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service

Abstract

A portable computing device has a computer programmed to store and communicate information and a housing configured to house the computer. A communications device, provided in the housing, is controlled by the computer and configured to communicate information between the computing device and a remote computer. An antenna is carried by the housing and is configurable to electrically couple with the communications device for communicating radio frequency information with the remote computer. A signal coupling device is carried by the housing and is configured to removably mate in signal transmitting relation with an external antenna via a complementary mating signal coupling device. A switch provided with the device is constructed and arranged to selectively connect the communications device with one of the dedicated antenna and the external antenna. According to one aspect, this invention comprises a portable electronic communications device, comprising a radio frequency modem, wireless communications circuitry, and an antenna operable to communicate over a wireless communications link with one of a local area network and a wide area network; and a proximity detection device operable to detect proximity of the device with the local area network, the wireless communications circuitry responsive to detection of the device within suitable signal communication proximity with the local area network to couple the communications circuitry with the local area network.

Claims

1. A portable electronic communications device, comprising:

a radio frequency modem, wireless communications circuitry, and an antenna operable to communicate over a wireless communications link with one of a local area network and a wide area network; and

a proximity detection device operable to detect proximity of the device with the local area network, the wireless communications circuitry responsive to detection of the device within suitable signal communication proximity with the local area network to couple the communications circuitry with the local area network.

2. The device of claim 1 wherein the radio frequency modem comprises a cellular radio frequency modem.

3. The device of claim 1 wherein the local area network and the wide area network each comprise wireless communications circuitry and a signal transmitting/receiving antenna, the device wireless communications circuitry selectively configurable to form a wireless communications link with one of the local area network and the wide area network.

4. The device of claim 1 wherein the proximity detection device comprises a radio frequency receiver, a receiving antenna coupled with the receiver, and a radio frequency power detector configured to detect received signal strength from radio signals transmitted from the local area network.

5. The device of claim 4 wherein the communications device further comprises switching circuitry responsive to detected received signal strength from the local area network to selectively signal couple the device wireless communications circuitry with one of the local area network and the wide area network.

6. The device of claim 5 wherein the communications device further comprises a signal processor coupled with the radio frequency receiver, the radio frequency power detector, the radio modem and wireless communications circuitry, and the switching circuitry, the signal processor operable to initiate detection of the device in acceptable signal proximity with the local area network to maintain a wireless communication link with the local area network when acceptable, and to switch the wireless communication link of the device with the wide area network when unacceptable.

7. The device of claim 1 wherein the proximity detection device comprises a radio frequency receiver, a receiving antenna coupled with the receiver, and a data stream error detecting device configured to detect data stream errors in a received signal from radio signals transmitted from the local area network.

8. The device of claim 1 wherein the proximity detection device comprises at least one radio frequency receiver coupled with a receiving antenna, and the local area network comprises a radio frequency transmitter and a loop antenna coupled to the antenna and extending along a periphery of a local geographic area intended for wireless communication with the local area network, the local area network transmitter and antenna sending an identified signal and the device receiver and antenna configured to detect transfer of the device across the local area network when entering and leaving the local geographic area intended for wireless communication with the local area network.

9. The device of claim 8 wherein the proximity detection device comprises a pair of radio frequency receivers and antennas, a first of the receivers and antennas operable to detect a first frequency signal and a second of the receivers and antennas operable to detect a second frequency signal, the local area network further comprising a pair of radio frequency transmitters and antennas, a first of the transmitters and antennas operating at the first transmitting frequency and the second of the transmitters and antennas operating at the second transmitting frequency, such providing a pair of wireless proximity communications links enabling direction identification of the device entering and leaving the local geographic area.

10. A portable electronic communications system, comprising:

a local area network;

a wide area network;

a portable electronic communications device including a radio frequency modem, wireless communications circuitry, an antenna operable to communicate over a wireless communications link, and a proximity detection device operable to detect proximity of the device with the local area network, the wireless communications circuitry responsive to detection of the device outside of suitable signal communication proximity with the local area network to couple the communications circuitry with the wide area network.

11. In a portable electronic device having communications capabilities, a switchable wireless communications device comprising:

a radio frequency modem, wireless communications circuitry, and an antenna operable to communicate over a wireless communications link with one of a local area network and a wide area network; and

a proximity detection device operable to detect proximity of the device with the local area network, the wireless communications circuitry responsive to detection of the device within suitable signal communication proximity with the local area network to couple the communications circuitry with the local area network.

12. The device of claim 11 wherein the local area network and the wide area network each comprise wireless communications circuitry and a signal transmitting/receiving antenna, the device wireless communications circuitry selectively configurable to form a wireless communications link with one of the local area network and the wide area network.

13. The device of claim 11 wherein the proximity detection device comprises a radio frequency receiver, a receiving antenna coupled with the receiver, and a radio frequency power detector configured to detect received signal strength from radio signals transmitted from the local area network.

14. The device of claim 13 wherein the portable electronic device further comprises switching circuitry responsive to detected received signal strength from the local area network to selectively signal couple the device wireless communications circuitry with one of the local area network and the wide area network.

15. The device of claim 11 wherein the proximity detection device comprises a radio frequency receiver, a receiving antenna coupled with the receiver, and a data stream error detecting device configured to detect data stream errors in a received signal from radio signals transmitted from the local area network.

16. The device of claim 11 wherein the proximity detection device comprises at least one radio frequency receiver coupled with a receiving antenna, and the local area network comprises a radio frequency transmitter and a loop antenna coupled to the antenna and extending along a periphery of a local geographic area intended for wireless communication with the local area network, the local area network transmitter and antenna sending an identified signal and the device receiver and antenna configured to detect transfer of the device across the local area network when entering and leaving the local geographic area intended for wireless communication with the local area network.

17. A method for selectively coupling a portable electronic communications device with one of a local area network and a wide area network, comprising:

providing a local area network and a wide area network, each having wireless communications features;

providing a proximity detection device on the portable electronic communications device for detecting proximity of the device with the local area network; and

configuring the portable electronic communications device in signal communication with the local area network when the proximity detection device detects the device within acceptable proximity with the local area network.

18. The method of claim 17 further comprising the step of configuring the portable electronic communications device in signal communication with the wide area network when the proximity detection device detects the device outside of acceptable proximity with the local area network.

19. A portable computer, comprising:

a radio frequency modem, wireless communications circuitry, and an antenna operable to communicate over a wireless communications link with one of a local area network and a wide area network; and

a proximity detection device operable to detect proximity of the computer with the local area network, the wireless communications circuitry responsive to detection of the computer within suitable signal communication proximity with the local area network to couple the communications circuitry with the local area network.

20. The portable computer of claim 19 wherein the proximity detection device comprises a radio frequency receiver, a receiving antenna coupled with the receiver, and a radio frequency power detector configured to detect received signal strength from radio signals transmitted from the local area network.

21. The portable computer of claim 20 wherein the portable computer further comprises switching circuitry responsive to detected received signal strength from the local area network to selectively signal couple the wireless communications circuitry with one of the local area network and the wide area network.

22. The portable computer of claim 21 further comprising a signal processor coupled with the radio frequency receiver, the radio frequency power detector, the radio modem and wireless communications circuitry, and the switching circuitry, the signal processor operable to initiate detection of the computer in acceptable signal proximity with the local area network to maintain a wireless communication link with the local area network when acceptable, and to switch the wireless communication link of the computer with the wide area network when unacceptable.