Wireless personal local area network utilizing removable radio frequency modules with digital interfaces and idle sense communication protocol

• US 5,602,854 A
• Filed: 03/05/1993
• Issued: 02/11/1997
• Est. Priority Date: 05/13/1991
• Status: Expired due to Term

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Norand Corporation (Baker Hughes Company)
• Inventors: Mahany, Ronald L., West, Guy J., Gollnick, Charles D., Luse, Ronald E.
• Primary Examiner(s): Kizou, Hassan
• Application Number:
  US08/027,140
• Time in Patent Office: 1,439 Days
• Field of Search: 370/85.3, 370/85.7, 370/85.8, 370/93, 370/94.1, 370/95.1, 370/95.2, 340/825.08, 455/11.1, 455/13.4, 455/38.3, 455/54.1, 455/54.2, 455/89, 455/343, 455/56.1, 364/424.04, 364/709.4, 364/403, 235/385, 379/58
• US Class Current: 370/313
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 2201/20 Binding and programming of remote control devices
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0032 Without explicit signalling
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/029 reducing the clock frequency of the controller
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A transceiver apparatus for creating a wireless personal local area network between a computer terminal and one or more peripheral devices. A separate transceiver is connected to the computer terminal and to each peripheral device. The transceivers can be connected to the terminal or peripheral device either internally or externally. A low power radio is used to communicate information between the computer terminal and peripheral devices. Different transceivers can be used for modifying the carrier frequency and power of the local area network. The microprocessor is located inside each transceiver and controls the information flow of the transceiver including the communication protocol which allows each device to know if other devices are communicating, which devices are being communicated to, and selectively address the peripheral devices. An Idle Sense communication protocol is used for information transfer between the computer terminal and the peripheral devices, increasing efficiency in power management and compensating for transmission collisions.

Claims

1. A portable, personal local area network carried by a single user for capturing and processing data, comprising:

a first, a second and a third portable data device, each data device having a battery power supply;

at least one of said first, second and third portable data devices includes a display;

at least one of said first, second and third portable data devices includes means for collecting data;

a first, a second and a third radio frequency unit operably and respectively attached to said first, said second and said third portable data devices; and

said first radio frequency unit managing communication among said first, second and third portable data devices.

2. The portable, personal local area network for a data capture system of claim 1 wherein the battery power supply of said first portable data device has a relatively high capacity in relation to said battery power supplies of said second and said third portable data devices, and wherein said first portable data device with said first radio frequency unit transmits IDLE SENSE messages and wherein said second portable data device with said second radio frequency unit and said third portable data device with said third radio frequency unit can initiate a communication sequence upon receiving one of said IDLE SENSE messages.

3. The portable, personal local area network for a data capture system of claim 2 wherein one of said second and said third portable data devices automatically assumes the transmission of IDLE SENSE messages when said first radio frequency unit is out of range thereof.

4. The portable, personal local area network for a data capture system of claim 3 wherein said first portable data device resumes responsibility for IDLE SENSE message transmission when it comes back into range of said second and said third portable data devices.

5. The portable, personal local area network for a data capture system of claim 2 including power management means for controlling and reducing the power consumption of said portable data devices, said power management means including means for transmitting said IDLE SENSE messages on a schedule and means for activating said radio frequency units only during IDLE SENSE messages and during subsequent communication sequences.

6. The portable, personal local area network for a data capture system of claim 1 wherein said second said third radio frequency units have a communication range of approximately two meters or less.

7. The portable, personal local area network for a data capture system of claim 1, wherein the data capture system comprising a remote stationary transceiver, and wherein at least one of the first, second and third portable data devices of the portable, personal local area network communicates with the remote stationary transceiver.

8. In a wireless communication network having a stationary, remote transceiver, a portable data capturing and processing system carried by a user, comprising:

a first portable unit comprising a data collection device and a first wireless transceiver;

a second portable unit comprising a peripheral device and a second wireless transceiver;

a third portable units comprising a third wireless transceiver;

said first, second and third wireless transceivers together forming a personal, wireless local area network to manage communication among said first, second and third portable units; and

at least one of said first, second and third wireless transceivers communicatively couples with a stationary, remote transceiver within the wireless communication network.

9. The portable data capturing and processing system of claim 8, wherein the at least one of said first, second and third wireless transceivers which communicatively couples with a stationary, remote transceiver provides relaying functionality between the personal, wireless local area network and the stationary, remote transceiver.

10. The portable data capturing and processing system of claim 8, wherein the first portable unit comprises a coded image reader.

11. The portable data capturing and processing system of claim 8, wherein at least one of said first, second and third portable units may be worn by the user.

12. The portable data capturing and processing system of claim 8, wherein one of said first, second and third portable units manages communication on the personal, wireless local area network.

13. The portable data capturing and processing system of claim 12, wherein if the one of said first, second and third portable units which manages communication on the personal, wireless local area network fails to perform such management, another of said first, second and third portable units automatically takes over such management responsibilities.

14. The portable data capturing and processing system of claim 8, wherein the at least one of said first, second and third wireless transceivers that communicatively couples with the stationary, remote transceiver is capable of engaging in longer range communication in comparison to the others of the first, second and third wireless transceivers which are capable of engaging in only relatively short range communication.