David F Willard

US Patent:

6477381, Nov 5, 2002

Filed:

Jun 28, 1999

Appl. No.:

09/331909

Inventors:

Karl Robert Weiss - Condotel, SG
Dee Nai Ong - Singapore, SG
David Frank Willard - Plantation FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 118

US Classification:

455458, 4551612, 4551651, 4551831, 4551851, 340 743

Abstract:

A communication device ( ) comprising a receiver ( ) for receiving coded messages transmitted on one or more channels. There is a micro-processor ( ), in communication with the receiver ( ) and a frequency synthesizer ( ) coupled to both the micro-processor ( ) and the receiver ( ) to thereby control reception of the channels. The communication device ( ) also has a memory ( ) storing a group of-channel frequencies, wherein the micro-processor ( ) is adapted, in combination with the frequency synthesizer ( ), to control the receiver ( ) to scan at least some of the channels during baud detect periods of a protocol cycle associated with at least one of the channels. Further, the micro-processor ( ) cyclically offsets a start of the baud detect periods after completion of a protocol cycle.

US Patent:

49146491, Apr 3, 1990

Filed:

Sep 12, 1988

Appl. No.:

7/243869

Inventors:

Robert J. Schwendeman - Pompano Beach FL
David F. Willard - Plantation FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 700

US Classification:

370 50

Abstract:

A multiple frequency message system includes a transmitter for transmitting coded message signals on a plurality of channels of which at least one channel to be assigned to each of a plurality of geographical areas. The coded message signals include channel identification information and message information being transmitted in a sequence of coded transmission slots on each of the plurality of channels. The sequence of coded transmission slots are transmitted offset in time such that a particular transmission slot is not simultaneously transmitted on any of the plurality of channels in each geographical area. A receiver capable of receiving the coded message signals during a predetermined coded transmission slot being transmitted on the plurality of channels is also provided. The receiver includes a channel selecting circuit responsive to the detected channel identification information during the predetermined transmission slot for maintaining operation on a predetermined channel or, for sequentially receiving the predetermined transmission slot on each of the plurality of channels.

US Patent:

62297945, May 8, 2001

Filed:

Aug 13, 1999

Appl. No.:

9/373652

Inventors:

David F. Willard - Plantation FL
Eric T. Eaton - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 7212
H04L 700

US Classification:

370328

Abstract:

A selective call device (106) for monitoring at least two communication systems. The selective call device (106) has a receiver (204) for receiving information from a first communication system (110), a processor (206) for referencing a time slot assignment on the first communication system (110) to a common time base. The processor (206) calculates timing information relating a common time base and a transmitter (222) transmits the timing information to the second communication system (120) informing the second communication system (120) when to transmit information to the selective call device (106) with reference to the common time base.

US Patent:

56253516, Apr 29, 1997

Filed:

Jan 24, 1995

Appl. No.:

8/378136

Inventors:

David F. Willard - Plantation FL
Barbara D. Laflin - Ocean Ridge FL
William J. Kuznicki - Coral Springs FL
Mark Aronson - Boynton Beach FL
Eric T. Eaton - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 726

US Classification:

34082552

Abstract:

A messaging system capable of transmitting messages to receivers which roam between coverage areas. In one configuration, a coverage area (100) is divided into a plurality of zones (110). A single simulcast system identification (SSID) number is assigned which consists of a local identification number which identifies the coverage area (100), a zone identifier which identifies a zone (110) within the coverage area, traffic splitting flags and a frequency. For larger roaming areas, a network (200) is defined as consisting of a plurality of service areas (210) and is identified by network roaming identification information (NRI). NRI information and/or SSID information is stored in a receiver according to desired coverage and like information is transmitted in the corresponding zone or service area.

US Patent:

55463940, Aug 13, 1996

Filed:

Dec 9, 1994

Appl. No.:

8/352647

Inventors:

Eric T. Eaton - Lake Worth FL
Ronald H. Evoy - West Palm Beach FL
David J. Hayes - Lake Worth FL
David F. Willard - Plantation FL
Shogo Ito - Kanagawa-ken, JP
Yasushi Yamao - Kanagawa-ken, JP

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 708

US Classification:

370 79

Abstract:

A time diversity communication system (150) comprises a messaging terminal (154), a queue (156) at the messaging terminal for queuing incoming messages, an encoder (158) for encoding a first fragment of a message and the remaining fragments of a message, a transmitter (160) for repeatedly transmitting the first fragment in a plurality of time slots to at least one selective call receiver (201) operating in a first mode, the number of time slots equaling a desired number of repeat transmissions and wherein the first fragment contains instructions for decoding the remaining fragments in a second mode by the selective call receiver, the transmitter (160) also repeatedly transmits the remaining portions of the message in subsequent time slots and at least one selective call receiver that decodes the first fragment and remaining fragments of the message in accordance with instructions in the decoded first fragment.

US Patent:

54758637, Dec 12, 1995

Filed:

Oct 4, 1993

Appl. No.:

8/131243

Inventors:

Floyd Simpson - Boynton Beach FL
David F. Willard - Plantation FL
Jian C. Huang - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 700

US Classification:

455 331

Abstract:

A method of locating a portable communication unit (108) having a transmitter (852) for transmitting acknowledge back signals, consists of the steps of transmitting, to the portable communication unit (108) from the communication cell transmitters (104), an information signal which consists of a predetermined color code word which identifies a subset of the communication cells (500) for which radio coverage does not overlap; receiving an acknowledge back signal from the portable communication unit (108) consisting of a reported color code value determined from the color code word transmitted in the information signal; and analyzing the reported color code value to determine a cell location of the portable communication unit (108). The portable communication unit (108) operates within a radio communication system consisting of communication cells (500) and a paging terminal (110), wherein the communication cells (500) consist of transmitters (104) for transmitting information signals intended for reception by the portable communication unit (108).

US Patent:

56821476, Oct 28, 1997

Filed:

Apr 13, 1995

Appl. No.:

8/421731

Inventors:

Eric Thomas Eaton - Lake Worth FL
David Frank Willard - Plantation FL
Barbara Diaz Laflin - Ocean Ridge FL
Mark H. Aronson - Boynton Beach FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 718

US Classification:

34082503

Abstract:

A method and apparatus select a receive frequency of a receiver (400) in a system having coverage areas divided into zones. A primary scan list is stored in the receiver (400) and contains coverage area identification parameters. The list is initially ordered from a most frequented coverage area at the top to a least frequented coverage area at the bottom. The parameters can include a coverage area identifier and a zone identifier, and at least one corresponding frequency identifier. A frequency identifier is chosen (604) from the top of the list and the receiver (400) is tuned to the receive frequency identified thereby. Baud rate detection is performed (608) and, in response to finding a predetermined baud rate, a received coverage area identifier and/or a received zone identifier is decoded (612). If the received identifier matches a corresponding parameter stored in the receiver, the receiver (400) is locked (904) to a signal on the receive frequency.

US Patent:

61013706, Aug 8, 2000

Filed:

Jul 6, 1998

Appl. No.:

9/110215

Inventors:

Eric Thomas Eaton - Lake Worth FL
Michael J. Deluca - Austin TX
David F. Willard - Plantation FL

Assignee:

Motorola - Schaumburg IL

International Classification:

H04B 700

US Classification:

455 381

Abstract:

A technique is used in a simulcast radio communication system (200) for providing improved local time information. The technique includes, in a fixed portion (300) of the simulcast radio communication system (200), alternatively transmitting in a radio signal a first local time and a second local time in a predetermined protocol position that occurs periodically in a signaling protocol, wherein the first local time and second local time differ by a time zone interval. A radio (500) that receives the radio signal presents local time to a user in manner that indicates the first and second local times.