公开(公告)号：CS9100582A3

公开(公告)日：1992-02-19

申请号：CS58291

申请日：1991-03-06

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04B7/204 ,  H04B7/185 ,  H04Q7/38 ,  H04B7/24

CPC classification number: H04B7/18521 ,  H04B7/18513 ,  H04B7/18563

公开(公告)号：HUT57495A

公开(公告)日：1991-11-28

申请号：HU802990

申请日：1990-12-03

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A ,  KACZMARCZYK JOHN M ,  NOLAN MICHAEL P ,  BUCHHOLZ DALE R ,  WHITE RICHARD E ,  CHANG HUNGKUN J

IPC: H04L12/54 ,  H04L29/00 ,  G06F13/00

Abstract: In this invention a hierarchical addressing technique is employed in a packet communications system to enhance flexibility in handling packet information. This method permits packet message data (Fig. 3) and certain packet control data (Fig. 3) to be stored in memory locations (32, 34) without having to be duplicated at a different memory location prior to transmission of the packet. This method is preferably employed in a ring configuration in which a series of packets have addressing mechanisms which points sequentially to each other to form a ring of packets.

公开(公告)号：CS591090A2

公开(公告)日：1991-10-15

申请号：CS591090

申请日：1990-11-28

Applicant: MOTOROLA INC

Inventor： BERKEN JAMES J ,  FREEBURG THOMAS A ,  OGASAWARA ROY T ,  WHITE RICHARD E ,  MITZLAFF JAMES E ,  BEDLEK GREGORY J

IPC: H04B7/24 ,  H04J3/00 ,  H04J3/16 ,  H04L12/28 ,  H04L12/56 ,  H04L5/00

Abstract: A wireless in-building telecommunications system for voice and data communications is disclosed having at least one node (101) arranged for linking to the PSTN (151) and at least one digital information source (153, 155, 157, 159) multiplicity of user modules (103) (UM's) linked to the node via a shared RF communications path (107). Each UM is coupled to a voice telephone instrument (127) and to one or more data terminals (165). The UM's communicate with the node by exchanging fast packets via the common RF path (107). The node also includes a fast-packet-switched mechanism controlled by a bandwidth allocating scheme to prevent collisions of packets as they are transmitted between the various units (101, 103) (nodes and/or user modules) that may be accessing the RF path (107). Also disclosed is a method for allocating the required bandwidth to each of the users of the common communications path in a wireless in-building telephone system. The invention provides for the combination of both voice and data in a single switch using a common packet structure. It allows for the dynamic allocation of bandwidth based on system loading. This includes not only bandwidth within the voice or data areas of the frame, but also between the voice and data portions. It also synchronizes the transfer of the data and the allocation of bus bandwidth.

公开(公告)号：DD294829A5

公开(公告)日：1991-10-10

申请号：DD34113490

申请日：1990-05-30

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04L1/00 ,  H04L1/02 ,  H04L1/20 ,  H03M13/00

Abstract: There is provided a scheme for bit error rate detection. It is characterised by: detecting the bit value present in a received multi-level signal (102), more narrowly detecting the bit value present in that received multi-level signal (104), comparing the results of narrow detection with the results detected otherwise to identify errors in detection (203, 206, 207 and 209), and accumulating detected symbol errors over unit time. Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds (213) a certain error threshold.

公开(公告)号：CA2073336A1

公开(公告)日：1991-09-07

申请号：CA2073336

申请日：1991-03-01

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A

IPC: H04B7/204 ,  H04B7/185 ,  H04Q7/38 ,  H04B7/19 ,  H04B7/26

Abstract: 2073336 9200632 PCTABS00010 There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overcome interference and maintaining subscriber transmissions to terrestrial networks at power levels about one order of magnitude of the below co-channel transmissions to satellite networks to avoid causing interference at the satellite. Such power level maintenance is provided by the network in communication with such subscriber. Moreover, a non-orbiting ("grounded") satellite cooperates as a switching node of both the satellite network and a terrestrial network to relay information between a terrestrial subscriber and the satellite radiotelephone network over a terrestrial network. The terrestrial network and the satellite network may communicate via either the inter-sattellite spectrum or the terrestrial-to-satellite spectrum.

公开(公告)号：AU7741291A

公开(公告)日：1991-05-31

申请号：AU7741291

申请日：1990-10-19

Applicant: MOTOROLA INC

Inventor： NOLAN MICHAEL P ,  FREEBURG THOMAS A ,  CHANG HUNGKUN J ,  FARHANGNIA FARZAD

IPC: H04J3/06 ,  H04L12/56 ,  H04L12/64 ,  H04J3/26

公开(公告)号：CA2038952A1

公开(公告)日：1991-03-30

申请号：CA2038952

申请日：1990-08-23

Applicant: MOTOROLA INC

Inventor： WHITE RICHARD E ,  BUCHHOLZ DALE R ,  JOHANSON LISA B ,  FREEBURG THOMAS A

IPC: H04L12/64 ,  H04Q3/42

Abstract: A network interface architecture for a packet/fast packet switch is described. This architecture provides for the combination of both voice and data in a single switch using a common packet structure. It allows for the dynamic allocation of bandwidth based on system loading. This includes not only bandwidth within the voice or data areas of the frame, but also between the voice and data portions. The network interface (105) provides a means (101) of passing all packets through the Network Interface (105) or allowing the packet devices to directly transfer packets between one another. The bandwidth allocation can easily be changed because the control and data memories are synchronized to one another. The architecture allows for the data packets and the control of bandwidth allocation to be controlled by a single switching device. It synchronizes the transfer of the data and the allocation of bus bandwidth. The control of the packet devices can be controlled at a very high bit rate such as 40 Mbps. It allows packet devices to directly transfer packets. It allows for easy re-allocation of bandwidth through the use of the NI Base Registers.

公开(公告)号：FI891275A

公开(公告)日：1989-09-19

申请号：FI891275

申请日：1989-03-17

Applicant: MOTOROLA INC

Inventor： FREEBURG THOMAS A ,  DAUTEL DONALD F

IPC: H04W76/04 ,  H04W88/02 ,  H04W88/16 ,  H04W92/02 ,  H04Q

Abstract: A unique cellular data telephone system includes a cellular telephone system (CTS 150), a cellular data switch (CDS 170), and a telephone central office (130) for providing both voice and data telephone services to portable and mobile cellular data telephones (CDTs 102, 122) located anywhere in a large geographical area. Each of the CDTs (102, 122) includes a data control unit (DCU 106), a cellular modem (162) and a cellular telephone (108) and associated antenna (110), and connects to a data terminal (104, 124) with keyboard and display. DCU (106) includes memory (302) for storing a CDS telephone number and CDT telephone number, microcomputer (304) with internal memory for controlling data communications between cellular modem (162) and data terminal (104), a duel tone multifrequency ("DTMF") encode (306) for encoding telephone numbers and control signals, a DTMF decoder (314) for decoding DTMF telephone digits and/or DTMF control tones, a buffer (312) for storing transmit data from data terminal (104), and analog switches (308, 310) for coupling DTMF encoder (306) and buffer (312) to the transmit data Td signal to cellular modem (162). If data transmit (104) is inactive for a predetermined time interval, DCU (106) automatically disconnects the cellular telephone call while maintaining the landline telephone call to a data host (140, 141). Once data is transmitted again by data terminal (104), DCU (106) automatically places another cellular telephone call and is reconnected to the landline telephone call.

公开(公告)号：CA1226039A

公开(公告)日：1987-08-25

申请号：CA458090

申请日：1984-07-04

Applicant: MOTOROLA INC

Inventor： KREBS JAY ,  FREEBURG THOMAS A

IPC: H04B7/24 ,  H04B7/26 ,  H04L20060101

Abstract: A data communications system (Figure 1) is described in which variable length messages (Figures 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 (Figure 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 (Figure 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).

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

IPC: H04B1/10 ,  H03G3/34 ,  H04B7/26 ,  H04J3/24 ,  H04B1/16

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.