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    25.
    发明专利
    未知

    公开(公告)号：AT122525T

    公开(公告)日：1995-05-15

    申请号：AT89101892

    申请日：1989-02-03

    Applicant: MOTOROLA INC

    Inventor： SCHAEFFER DENNIS R

    IPC: H04B7/26 ,  H04W24/00 ,  H04W72/06 ,  H04W84/04 ,  H04W88/08 ,  H04Q7/20

    Abstract: An improved TDMA radiotelephone cellular communication system (122, 115, 199) employs an improved cell site scan monitoring technique. The technique includes monitoring radiotelephone calls, and tracking and recording their signal qualities. The records are used to maintain and determine which frequencies and which time partitions at the base site equipment (115, 119) are being utilized for radiotelephone communication. When a new call assignment is required at a cell site (115 or 119), it is assigned to a time partition of a base site equipment frequency in a frequency prioritized manner such that radiotelephone calls are concentrated within each frequency so as to reduce the number of frequencies carrying radiotelephone calls.

    MULTIPLE USER SPREAD-SPECTRUM COMMUNICATION SYSTEM
    26.
    发明专利
    MULTIPLE USER SPREAD-SPECTRUM COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2092292A1

    公开(公告)日：1993-02-02

    申请号：CA2092292

    申请日：1992-06-08

    Applicant: MOTOROLA INC

    Inventor： SCHAEFFER DENNIS R ,  KOTZIN MICHAEL D

    IPC: H04B7/26 ,  H04B7/005 ,  H04J4/00 ,  H04W36/16 ,  H04W52/50

    Abstract: A communication system having a site employing a plurality of communication channels. Each channel is assigned a desired received signal strength threshold. A channel is assigned to a subscriber unit based upon the strength of the signal received at the site and the power control range of the subscriber unit. The selection of a channel may be performed either by the site or the subscriber unit. In an FDMA environment, each separate frequency division channel may be assigned different received signal strength thresholds. In a non-overlapping time interval (TDMA) environment, each separate time division channel may be assigned different received signal strength thresholds. In another embodiment, a combination of FDMA and TDMA environments can be used.

    CELLULAR RADIOTELEPHONE COMMUNICATIONS SYSTEM
    27.
    发明专利
    CELLULAR RADIOTELEPHONE COMMUNICATIONS SYSTEM 未知

    公开(公告)号：AU6401790A

    公开(公告)日：1991-04-08

    申请号：AU6401790

    申请日：1990-07-27

    Applicant: MOTOROLA INC

    Inventor： SCHAEFFER DENNIS R

    IPC: H04B7/26 ,  H04W16/02 ,  H04W16/12 ,  H04W16/24 ,  H04Q7/00 ,  H04M11/00

    Abstract: A cellular radiotelephone communications system comprising a system of cells that are made up of an array of diretional sector antennas. These antennas are centrally located in the cell and radiates into a 60 DEG area of the cell. Each antenna in a cell has a group of frequencies assigned to it that is different than the group of frequencies assigned to the other antennas within that cell. These frequency groups are repeated either 2 or 8 times respectively in a 4 or 16 cell repeat pattern, effectively forming a two cell reuse pattern. The preferred embodiment of this invention is asymmetrically positioning the repeating frequency groups in an alternating fashion so that one row faces in the opposite direction of another row. The asymmetrical positioning of cells is possible only by departing from the prior art, cellular positioning rules. The positioning rules used in this invention create a 4 or 16 cell repeat pattern by locating co-channel cells closer in one direction than another.

    VOX REMOTE UNIT CONTROL IN A CELLULAR SYSTEM
    28.
    发明专利
    VOX REMOTE UNIT CONTROL IN A CELLULAR SYSTEM 未知

    公开(公告)号：CA1271224A

    公开(公告)日：1990-07-03

    申请号：CA552459

    申请日：1987-11-23

    Applicant: MOTOROLA INC

    Inventor： BONTA JEFFREY D ,  SCHAEFFER DENNIS R ,  MENICH BARRY J ,  HOFSTRA EDWARD J

    IPC: H04W36/08 ,  H04W36/30 ,  H04W74/06 ,  H04B7/26

    Abstract: VOX REMOTE UNIT CONTROL IN A CELLULAR SYSTEM of the Invention A cellular radiotelephone system providing service to remote units having a voice operated transmitter (VOX) is disclosed. If the regularly scheduled periodic signal quality measurements made by fixed site equipment indicate that the remote unit signal has not been received for a predetermined number of measurements, an audit request is transmitted to the remote unit. The remote unit responsively keys its transmitter for a predetermined period of time. A first special scan is programmed into the regular process such that the fixed site equipment may continue with its regular process until the signal quality measurement must be made. A second measurement is made following the first and if the two signal quality measurements made while the VOX remote unit is known to be transmitting agree, system reconfiguration for the service of this remote unit may be implemented by the cellular system.

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