Personal area network with automatic attachment and detachment

Details Personal area network with automatic attachment and detachment Personal area network with automatic attachment and detachment

2000-03-27

2004-10-12

Phan, Man (Department: 2665)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S338000, C370S403000, C370S442000, C709S202000, C709S220000

Reexamination Certificate

active

06804232

ABSTRACT:

BACKGROUND OF THE INVENTION
A. Field of the Invention
The present invention relates to a data network and, more particularly, to a star data network that facilitates bidirectional wireless data communications between a main processor unit and a varying number of peripheral units as they become located within the proximity of the processor unit.
B. Description of Related Art
Over the last decade, the size and power consumption of digital electronic devices has been progressively reduced. For example, personal computers have evolved from lap tops and notebooks into hand-held or belt-carriable devices commonly referred to as personal digital assistants (PDAs). One area of carriable devices that has remained troublesome, however, is the coupling of peripheral devices or sensors to the main processing unit of the PDA. Generally, such coupling is performed through the use of connecting cables. The connecting cables restrict the handling of a peripheral in such a manner as to lose many of the advantages inherent in the PDA's small size and light weight. For a sensor, for example, that occasionally comes into contact with the PDA, the use of cables is particularly undesirable.
While some conventional systems have proposed linking a keyboard or a mouse to a main processing unit using infrared or radio frequency (RF) communications, such systems have typically been limited to a single peripheral unit with a dedicated channel of low capacity.
Based on the foregoing, it is desirable to develop a low power data network that provides highly reliable bidirectional data communication between a host or server processor unit and a varying number of peripheral units and/or sensors while avoiding interference from nearby similar systems.
SUMMARY OF THE INVENTION
Systems and methods consistent with the present invention address this need by providing a wireless personal area network that permits a host unit to communicate with peripheral units with minimal interference from neighboring systems.
A system consistent with the present invention includes a hub device and at least one unattached peripheral device. The unattached peripheral device transmits an attach request to the hub device with a selected address, receives a new address from the hub device to identify the unattached peripheral device, and communicates with the hub device using the new address.
In another implementation consistent with the present invention, a method for attaching an unattached peripheral device to a network having a hub device connected to multiple peripheral devices, includes receiving an attach request from the unattached peripheral device, the attach request identifying the unattached peripheral device to the hub device; generating a new address to identify the unattached peripheral device in response to the received attach request; sending the new address to the unattached peripheral device; and sending a confirmation message to the unattached peripheral device using the new address to attach the unattached peripheral device.
In yet another implementation consistent with the present invention, a method for attaching an unattached peripheral device to a network having a hub device connected to a set of peripheral devices, includes transmitting an attach request with a selected address to the hub device; receiving a new address from the hub device to identify the unattached peripheral device; and attaching to the network using the new address.


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patent: 6487180 (2002-11-01), Borgstahl et al.

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