05276680 is referenced by 256 patents and cites 7 patents.

Spaced-apart communication controllers connected to a cable-based network place a portable device in communication with the network for transfer of data packets. Each controller communicates with the portable device with packet transmissions through air, and requires registration of the portable device before offering packet transferring services. The registration process involves transmitting a packet from the portable unit requesting a response from controllers, transmitting a response packet from each controller receiving the request, selecting one of the responding controllers at the portable unit according to criteria that enhance data transfer, and transmitting from the portable unit a packet identifying the selected controller to complete registration. The selected controller transmits to other controllers via the network cable a packet confirming the registration. A controller with which the portable device was previously registered responds by de-registering the device and transmitting any stored packets addressed to the device via the cable to the newly selected controller. A power saving protocol is implemented for a battery-operated portable device and adjusted continually to accommodate the rate at which transmissions to the device occur. The power saving arrangement includes disabling the receiving section of the device.

Title
Wireless coupling of devices to wired network
Application Number
7/694401
Publication Number
5276680
Application Date
May 1, 1991
Publication Date
January 4, 1994
Inventor
Steven Messenger
Scarborough
CA
Agent
Mirek A Waraksa
Assignee
Telesystems SLW
CA
IPC
H04B 7/26
H04L 12/28
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