Multiplex communications – Communication over free space – Portable address responsive receiver
Reexamination Certificate
2000-12-15
2003-02-04
Holloway, III, Edwin C. (Department: 2635)
Multiplex communications
Communication over free space
Portable address responsive receiver
C370S330000, C340S007420
Reexamination Certificate
active
06515971
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to communication devices which can scan multiple frequency channels, and more specifically to communication devices which utilize background scanning to scan the multiple frequency channels.
2. Description of the Related Art
Communication devices, such as one-way receiving devices, and two-way transceivers have been utilized in a variety of communication systems which often require the communication device to operate on multiple frequency channels as the communication devices move from one geographic area to another. U.S. Pat. No. 5,923,266 issued Jul. 13, 1999 to Wang, et al., entitled “Method for Dynamically Changing Control Frames for Selective Call Receiving Devices” describes the operation of such a prior art two-way communication device which can dynamically scan multiple frequency channels.
As the number of communication devices within a given geographic area increase, there is a need to control the transmission of information to smaller transmission areas to increase the number of communication devices that can send or receive messages within the communication system. Because the communication device in such systems can receive transmissions generated by multiple transmitters, there is a need for the communication device to be capable of receiving transmissions not only on the channel on which the communication device is currently registered, but also on alternate frequency channels utilizing background scanning to identify alternate transmitters which are providing stronger or higher priority signals operating on different frequency channels.
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Ayerst Douglas I.
Nelson Leonard E.
Crilly Daniel C.
Holloway III Edwin C.
Macnak Philip P.
Motorola Inc.
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