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Patent Agency Ranking
公开(公告)号：CA1182181A
公开(公告)日：1985-02-05
申请号：CA414362
申请日：1982-10-28
Applicant: MOTOROLA INC
Inventor： MILLEKER WILLIAM , FREEBURG THOMAS A , STEPIEN MICHAEL A
Abstract: Data muting apparatus is described that mutes data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. A dispatcher at the central station also communicates with operators of the mobile and portable radios. The central station includes a base station having an RF transmitter and RF receiver, a dispatcher console, a general communications controller (GCC), a digital communications computer and a display terminal. The base station transmitter and receiver communicate over an RF duplex channel to the RF receiver and RF transmitter, respectively, of the mobile and portable radios. The dispatcher console provides for voice communications and is coupled by a transmit signal line and a receive signal line to the base station transmitter and receiver, respectively. The GCC provides for data communications and is also coupled to the transmit signal line and is interposed between the dispatcher console and the base station receiver in the receive signal line. The GCC and mobile and portable radios include data muting apparatus embodying the present invention. The data muting apparatus includes a detector for detecting the presence of a carrier signal and muting circuitry for muting the receiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry detects the last bit of a following information word in the received data signal and unmutes the receiver output. Thus, data signals at the beginning of each communication are muted without impairing voice communications. furthermore, since the receiver output is muted until the last bit of the data signal is detected, the muting apparatus can accommodate variable length data signals.
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公开(公告)号：CA1130865A
公开(公告)日：1982-08-31
申请号：CA312978
申请日：1978-10-10
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M , DIRKES WILLIAM R , JOGLEKAR MANOHAR A , SECORA JAMES C , STEPIEN MICHAEL A
Abstract: CM-77943 DATA COMMUNICATION SYSTEM A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks havè N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.
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公开(公告)号：CA2026141A1
公开(公告)日：1991-03-30
申请号：CA2026141
申请日：1990-09-25
Applicant: MOTOROLA INC
Inventor： STEPIEN MICHAEL A , COE RICHARD H
IPC: H04B7/26
Abstract: AUTOMATIC SYSTEM STEERING OF ROAMER UNITS IN A NETWORKED TRUNKING ENVIRONMENT A method for providing load management and talkgroup steering for roaming communication units in a trunked communication environment having overlapping coverage areas.
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公开(公告)号：CA1128133A
公开(公告)日：1982-07-20
申请号：CA382192
申请日：1981-07-21
Applicant: MOTOROLA INC
Inventor： BENCH STEPHEN M , DIRKES WILLIAM R , JOGLEKAR MANOHAR A , SECORA JAMES C , STEPIEN MICHAEL A
Abstract: ?M-77943 DATA COMMUNICATION SYSTEM A data communication system for use in the control and monitoring of mobile stations, for example, in a bus monitoring system, from a central station over a communication channel carrying both data and voice information. Information is encoded into digital messages having a start code followed by one or more data blocks. The start code identifies the beginning of the data block that follows and enables synchronization of clock circuitry to the received data frequency. The data blocks have N digital words with M binary bits where one word is a parity word and N-1 words are data words. Each of the data words has a data portion and parity portion coded for correction of at least one error. Reliability is enhanced by a data detector which discriminates between data and noise or voice to provide an indication of the presence of data. In transmitting the digital messages, the bits of the N words in each data block are interleaved to provide protection against error bursts.
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公开(公告)号：EP1743492A4
公开(公告)日：2009-06-03
申请号：EP05736388
申请日：2005-04-19
Applicant: MOTOROLA INC
Inventor： UPP STEVEN D , STEPIEN MICHAEL A , WILSON TIMOTHY J
Abstract: Methods and apparatus are provided for facilitating mobility of a mobile station (MS) in a wireless local area network (WLAN) with uninterrupted communications. The method includes associating (501) a MNIP address (410) with the MS; establishing (502) a communications link between the MS and a first WLAN AP (109) in a first subnet (117) and associating (503) a first WLAN IP (420) address with the MS. Then using (505) the first WLAN IP address for an application that benefits from a persistent connection. Further included is establishing (507) a second communications link between the MS and a second WLAN AP 111 in a second subnet (119). When the MS is using the application, continuing to use the first WLAN IP address for communicating with the second subnet; and requesting (517) a second WLAN IP address in the second subnet when the persistent connection is no longer needed.
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