公开(公告)号：AU591583B2

公开(公告)日：1989-12-07

申请号：AU7896487

申请日：1987-09-25

Applicant: MOTOROLA INC

Inventor： KREBS JAY ,  FREEBURG THOMAS ARTHUR

IPC: H04W28/06 ,  H04L1/00 ,  H04B7/26

Abstract: A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field, a message synchronization field and a plurality of channel data blocks for efficiently and reliably handling long strings of data or text. Each channel data block includes an information field, a parity field for error-connecting the information field and a channel state field indicating whether or not the radio channel is busy or free. The GCC is coupled to a cellular arrangement of channel communications modules (CCM's), which each include a radio transmitter and/or radio receiver. The mobile and portable radios communicate with the GCC by way of the CCM's.

公开(公告)号：MX155466A

公开(公告)日：1988-03-16

申请号：MX20192984

申请日：1984-07-06

Applicant: MOTOROLA INC

Inventor： KNEISEL THOMAS FREDERICK ,  BALZANO QUIRINO ,  FREEBURG THOMAS ARTHUR

IPC: H01Q1/24 ,  H04B1/38 ,  H04B7/08

Abstract: An adaptable homotropic antenna system for use with a portable communication transceiver is described. The antenna system can be used for reception or transmission and can be completely enclosed within the portable transceiver housing. The homotropic antenna system evaluates the quality of a received signal and if the signal is below a predetermined threshold level, an alternate antenna will be selected. The antenna system will continue to sample the available antennas until an antenna produces a signal of acceptable quality.

公开(公告)号：IT1179396B

公开(公告)日：1987-09-16

申请号：IT4854984

申请日：1984-07-11

Applicant: MOTOROLA INC

Inventor： KREBS JAY ,  FREEBURG THOMAS ARTHUR

IPC: H04B7/24 ,  H04B7/26 ,  H04L20060101 ,  H04L

Abstract: Two channel data blocks include an information field, with control data and a check word, and a parity field coded from the information field according to a predetermined code. The field bits are interleaved so that the consecutive bits of a field are separated by a predetermined number of bits. Following data blocks include information and parity fields with the bits interleaved. The last blocks information field also includes a check word coded from the data in the information field of the third and following blocks. In another arrangement the first block includes an information field, with at least one command and a station address, and a parity field coded from the information field according to a predetermined code. The second block has an information field including a block count indicating the number of following blocks, a message sequence number incremented for each message and a check word, and a parity field. Following blocks have an information field and a parity field. The bits of the fields in each block are interleaved.

公开(公告)号：AU555331B2

公开(公告)日：1986-09-18

申请号：AU4745685

申请日：1985-09-13

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS ARTHUR

IPC: H04B7/26 ,  H04B7/08 ,  H04W68/00 ,  H04B7/06 ,  H04B7/005

Abstract: A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitters and receivers, and a plurality of portable radios. Message signals carrying alphanumeric information are communicated between the GCC and the portable radios by way of a radio channel. Each CCM takes a signal strength measurement every time it receives a message signal from a portable radio. The GCC gathers the signal strength measurements from the CCM receivers receiving the same message signal and computes an adjusted signal strength for each zone. The GCC then selects the zone having the largest adjusted signal strength for determining the location of the portable radio that transmitted the message signal. Whenever the GCC transmits a message signal to a portable radio, the CCM transmitter is used that covers the zone having the largest adjusted signal strength for the last transmission from that portable radio. Since the GCC can be simultaneously transmitting message signals to portable radios in other zones using non-interfering CCM transmitters, information throughput is greatly enhanced.

公开(公告)号：AU4745685A

公开(公告)日：1986-01-02

申请号：AU4745685

申请日：1985-09-13

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS ARTHUR

IPC: H04B7/26 ,  H04B7/08 ,  H04W68/00 ,  H04B7/06 ,  H04B7/005

Abstract: A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitters and receivers, and a plurality of portable radios. Message signals carrying alphanumeric information are communicated between the GCC and the portable radios by way of a radio channel. Each CCM takes a signal strength measurement every time it receives a message signal from a portable radio. The GCC gathers the signal strength measurements from the CCM receivers receiving the same message signal and computes an adjusted signal strength for each zone. The GCC then selects the zone having the largest adjusted signal strength for determining the location of the portable radio that transmitted the message signal. Whenever the GCC transmits a message signal to a portable radio, the CCM transmitter is used that covers the zone having the largest adjusted signal strength for the last transmission from that portable radio. Since the GCC can be simultaneously transmitting message signals to portable radios in other zones using non-interfering CCM transmitters, information throughput is greatly enhanced.

公开(公告)号：DK170484A

公开(公告)日：1984-03-28

申请号：DK170484

申请日：1984-03-28

Applicant: MOTOROLA INC

Inventor： BURKE TIMOTHY MARK ,  FREEBURG THOMAS ARTHUR ,  KREBS JAY ROBERT ,  NOBLE SCOTT WILLIAM

IPC: H04B1/10 ,  H04B7/26 ,  H04M7/04 ,  H04W88/02 ,  H04B ,  H04Q

Abstract: A data signalling system for the transmission of signals between at least one main station 50, 52 and a number of secondary stations 60, 62, 64. The system is suitable for use in radio communication systems consisting of several units which are capable of speech and data communication. A register module is used which permits a very flexible signalling system which can be adapted to suit a wide range of communication networks. The data transfer is carried out using data packets of fixed length (Figures 2 and 3) which are encoded with error correction and are transmitted using PSK modulation.

公开(公告)号：DE2907836A1

公开(公告)日：1980-01-17

申请号：DE2907836

申请日：1979-02-28

Applicant: MOTOROLA INC

Inventor： DOLIKIAN ARMAN VAHE ,  FREEBURG THOMAS ARTHUR

IPC: H04B1/04 ,  H04B1/54 ,  H04B7/26 ,  H04B17/00

Abstract: A mobile data terminal system is capable of voice or microprocessor controlled data transmission over a keyed transmitter. The improved timer apparatus disables further transmission if the transmission duration or the average duty cycle over a predetermined time period of repeated transmitter keying exceed predetermined limits. Where the disable mode resulted from a microprocessor fault, the transmitter continues to be disabled until the microprocessor is reset.

公开(公告)号：EP0153333A4

公开(公告)日：1985-11-21

申请号：EP84902851

申请日：1984-06-28

Applicant: MOTOROLA INC

Inventor： KREBS JAY ,  FREEBURG THOMAS ARTHUR

IPC: H04W28/06 ,  H04J3/06 ,  G08B5/22 ,  H04L5/22

CPC classification number: H04W28/06

Abstract: A data communications system (Fig. 1) in which variable length messages (Figs. 3, 4 and 5) are communicated between a general communications controller (GCC 104) and a plurality of portable and mobile radios (130, 132, 134, 136, 138). The variable length messages (Fig. 3) include a bit synchronization field (204), a message synchronization field (205) and a plurality of channel data blocks (203) for efficiently and reliably handling long strings of data or text. Each channel data block (Fig. 5) includes an information field (503), a parity field (505) for error-connecting the information field and a channel state field (507) indicating whether or not the radio channel is busy or free. The GCC (104) is coupled to a cellular arrangement of channel communications modules (CCM's 106, 108, 110, 112), which each include a radio transmitter (114, 120, 124) and/or radio receiver (116, 118, 122, 126, 128). The mobile and portable radios (130, 132, 134, 136, 138) communicate with the GCC (104) by way of the CCM's (106, 108, 110, 112).

Abstract translation: 一种数据通信系统（图1），其中可变长度消息（图3,4和5）在通用通信控制器（GCC 104）和多个便携式和移动无线电（130,132,134,136 ，138）。 可变长度消息（图3）包括比特同步字段（204），消息同步字段（205）和多个信道数据块（203），用于有效且可靠地处理长串数据或文本。 每个信道数据块（图5）包括信息字段（503），用于错误连接信息字段的奇偶校验字段（505）和指示无线电信道是忙还是空的信道状态字段（507）。 GCC（104）耦合到信道通信模块（CCM106,108,110,112）的蜂窝结构，每个信道通信模块包括无线电发射机（114,120,124）和/或无线电接收机（116,118,122 ，126,128）。 移动和便携式无线电（130,132,134,136,138）通过CCM（106,108,110,112）与GCC（104）通信。

公开(公告)号：EP0116577A4

公开(公告)日：1985-02-18

申请号：EP83902481

申请日：1983-06-24

Applicant: MOTOROLA INC

Inventor： BURKE TIMOTHY MARK ,  NOBLE SCOTT WILLIAM ,  FREEBURG THOMAS ARTHUR ,  KREBS JAY ROBERT

IPC: H04B1/10 ,  H04B7/26 ,  H04M7/04 ,  H04W88/02 ,  H04B1/00 ,  H04Q7/00

CPC classification number: H04W88/026 ,  G06K13/0825

Abstract: A data signalling system for transmitting signals between at least one primary station (50, 52) and a plurality of secondary stations (60, 62, 64). The system is well adapted for use in multiple unit radio communications systems capable of voice and data communications. A register model is utilized which permits a highly flexible signalling system compatible with a wide range of communications networks. Data transfer is accomplished using fixed length data packets (Fig. 2 and 3) which are error correction encoded and transmitted utilizing PSK modulation.

公开(公告)号：IN180327B

公开(公告)日：1998-01-24

申请号：IN172DE1991

申请日：1991-03-05

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS ARTHUR

IPC: H04B7/185