Motorola Corporation

David F Willard

Robert J Schwendeman

Michael J DeLuca

Eric Thomas Eaton

William J Kuznicki

Barbara Diaz Laflin

Michael Joseph DeLuca

Morris A Moore

Paul T Bennett

Leonard E Nelson

Omid Tahernia

David R Petreye

William V Braun

Jerry L Sandvos

Frank E Lambrecht

James C Page

Mark H Aronson

John Dominic Nicolini

Gerald W Tidwell

Richard Alexander Erhart

James G Mittel

Floyd D Simpson

Leon Jasinski

David Jeffery Hayes

Jian C Huang

Philip P Macnak

Gregory O Snowden

Ronald E Sharp

Dee Nai Ong

Karl Robert Weiss

Alfred R Lucas

Ronald Hugh Evoy

Kenneth D Fisch

Marcus A Gade

Alan I Spiro

Allan I Spiro

Yasushi Yamao

Shogo Ito

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.

Selective call receiver and method for detecting mandatory frames of a channel protocol

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

Selective call device and method for monitoring at least two communication systems

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.

Method and apparatus used in a simulcast radio communication system for

A message transmission system (100) and method for providing flexible roaming to a receiving device (126) which includes a code memory (422) which stores addresses of a first type (1202) to enable reception of messages within a local geographic area, and an address of a second type (1214) to enable reception of the messages within a different geographic area. The message transmission system (100) includes a transmitter (SSID1) which transmits the addresses of the first type with the messages associated therewith within the local geographic area, and a controller (204) which controls conversion of the addresses of the first type to the address of the second type, and transfer of the address of the second type with the messages associated with the addresses of the first type to a transmitter (SSID2-SSID5) which transmits the address of the second type with the messages associated therewith to the receiving device when operating within the different geographic area.

Messaging system providing flexible roaming and method therefor

A method by which a data communication receiver may recognize a specific channel comprises the steps of receiving (1605) a data stream on a first channel for a first amount of time to determine (1680) whether network identification information is included in the data stream received on the first channel, wherein the network identification information comprises at least one address assigned to represent a network. If the network identification information is not included in the data stream received on the first channel within the first amount of time, reception is switched (1614) to receive (1605) a data stream on a second channel. The method further comprises the step of receiving (1605) the data stream on the second channel for a second amount of time to determine (1680) whether the network identification information is included in the data stream received on the second channel. If the network identification information is not included in the data stream received on the second channel within the second amount of time, reception is switched (1614) to receive (1605) a data stream on a third channel.

Paging network identification information distributed in address field

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.

Method and apparatus for selecting a receive frequency in a

A selective call system provides dynamic group calling by transmitting a paging message (FIG. 10) to each data communication receiver in a defined group. The paging message comprises a group call address (1040) and frame (1050) and phase (1060) information identifying when the group message will be transmitted. The group call message is then transmitted (326, 328) in the assigned frame and phase. When the paging messages comprising the group call address are received (1904) by the data communication receivers, the group call address is decoded and temporarily stored (1910) as an address of the receiver. Within the identified frame and phase, address correlation with the group call address is attempted (1918, 1926) and the group call message, when found (1920), is received and decoded (1922) as a paging message. After reception of the group call message, the group call address and associated stored information is erased (1924).

Method and apparatus for dynamic group calling in a selective call system

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.

Messaging system having roaming capability

Network roaming information (NRI), which comprises identifies a network (200) and a service area (210) within the network (200), a receiver address, is transmitted in a network (200) during a predetermined number of time slots of a signal, whereby the signal is transmitted in consecutive cycles, each cycle comprising a plurality of consecutive time slots. The placement of the NRI in the transmitted signal is made to be predicted by a receiver so that the receiver can compute an expected time slot location of a NRI to be compared with a stored NRI. The placement of the NRI is made according to an algebraic relationship between moduloN of the transmission frequency of the signal, moduloN of the order of the cycle, and moduloN of a portion of the NRI, wherein N is an integer.

Network identification information placement architecture for messaging

A messaging system and method capable of transmitting group messages throughout a Network (200) such that receivers which are outside of a 'local' or 'home' area of coverage receive such group messages, whereas receivers which are in a 'local' area of coverage over ride and do not receive the group message as a result of decoding system identifiers and ignoring those messages having network roaming identification.

Messaging system and method having roaming capability and controlled

A selective call receiver (111) receives a synchronous selective call signal (99) having synchronization portions (102 and 104) and a frame identification portion (106). Upon finding the signal the selective call receiver's bit and frame synchronizers (126 and 128) synchronize to a frame (100) of the signal and a frame ID decoder (130) decodes the frame ID (106). A comparator (136) compares the received frame ID (106) with an ID (142) assigned to the receiver, and optionally a first and second mask (134A and 134B) to determine the number of frames until an occurrence of a desired frame and conserves power until the occurrence of the desired frame (188).

Method and apparatus for synchronizing to a synchronous selective call

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.

Message fragmenting in a time diversity radio system

A communication receiver (106) receives an address code word (1800) of a transmitted message, the message comprising the address code word (1800) and an associated data portion (1610), the address code word comprising an address portion (1802,1804). The communication receiver (106) corrects (2104) up to a predetermined number of bit errors in the received address code word (1800). The communication receiver (106) can conserve power following a failed correction of the address code word (1800). Alternatively, the communication receiver (106) compares (2108,2111) the address portion (1802,1804) of the corrected address code word (1800) to at least one predetermined subscription address (1704,1706). The communication receiver (106) can conserve power following a determination of no match (2110,2114,2308) between the address portion (1802,1804) of the corrected address code word (1800) and the at least one predetermined subscription address (1704,1706).

Addressing method for conserving power in distributed information

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).

Method and apparatus for delivering messages to portable communication

A paging receiver device and method are disclosed in which analog information transmitted from an external source such as a paging transmitter are received and decoded. The analog information includes at least one voice message. The voice message is recovered, digitized, and stored in one of a plurality of message slots in a memory of the paging receiver. In response to a paging user's request, the digitized stored message is recalled from memory, reconverted from digital information to analog information, and used to produce audible voice information being a replica of the original analog voice message.

Growing community of inventors

Plantation, FL, United States of America

David F Willard