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    41.
    发明专利
    未知

    公开(公告)号：BR9712089A

    公开(公告)日：1999-08-31

    申请号：BR9712089

    申请日：1997-05-23

    Applicant: QUALCOMM INC

    Inventor： WEAVER LINDSAY A JR ,  MUNSINGER DAVID B ,  PADOVANI ROBERTO ,  ZIV NOAM A ,  KARMI GADI ,  GILHOUSEN KLEIN S

    IPC: H04W24/02 ,  H04W36/14 ,  H04Q7/38 ,  H04B7/26

    Abstract: The cellular communication system includes a number of base stations through which a mobile unit communicates. The mobile unit maintains a list of active base stations with which it can communicate. One of the active stations is in communication with the mobile and uses this communication to measure the round-trip-delay between mobile and station. This delay is compared with a threshold and if this is exceeded, and the base station is a boundary station, then a hard hand-off is executed. The mobile can also monitor candidate base stations and if a triggering pilot signal is detected a hand-off can be triggered. Preferably the handoff can be between base stations controlled by different mobile switching centres.

    47.
    发明专利
    未知

    公开(公告)号：FI962034A

    公开(公告)日：1996-07-12

    申请号：FI962034

    申请日：1996-05-13

    Applicant: QUALCOMM INC

    Inventor： PROPACH DAVID S ,  GROB MATTHEW S ,  JACOBS PAUL E ,  KARMI GADI

    IPC: H04M11/00 ,  H04N20060101 ,  H04N1/00 ,  H04N1/32 ,  H04N1/327 ,  H04N1/333 ,  H04N1/41 ,  H04N1/411 ,  H04N

    Abstract: In a method for minimizing a data bottleneck in a Low Data Rate Network (LDRN) (34), i.e. a facsimile network having a transmission rate less than the data rate of the facsimile machines serviced by the network, the LDRN (34) has a one-dimensional image data format and a two-dimensional image data format. The method comprises processing the facsimile transmissions in order to make the data rates of the LDRN and the FAX machines compatible, thereby minimizing any potential facsimile data bottlenecks that may occur in the LDRN due to its slower data rate. In the method, a first facsimile (FAX) machine (12) is set to the one-dimensional image data format; a data stream encoded in the one-dimensional image data format is sent (32) from the first FAX machine (12) to a first side of the LDRN (34); the data stream sent is uncompressed, and the uncompressed data stream is re-encoded into the two-dimensional image data format; the re-encoded data stream is transmitted from the first side of the LDRN (34) to a second side of the LDRN (34); the transmitted data stream is second uncompressed; the second uncompressed data stream is second re-encoded into the one-dimensional image data format; and the re-encoded data stream is second sent (36) from the second side of the LDRN (34) to a second FAX machine (16).

    Method and apparatus for handoff between different cellular communications systems
    48.
    发明专利
    Method and apparatus for handoff between different cellular communications systems 未知

    公开(公告)号：AU3825695A

    公开(公告)日：1996-05-06

    申请号：AU3825695

    申请日：1995-09-29

    Applicant: QUALCOMM INC

    Inventor： GILHOUSEN KLEIN S ,  KARMI GADI ,  TIEDEMANN EDWARD G JR

    IPC: H04W36/14 ,  H04W36/18 ,  H04Q7/38

    Abstract: A method and system for performing an intersystem handoff of communication with a mobile station between base stations of first and second cellular systems is disclosed herein. At the mobile station, a quantifiable parameter of a signal transmitted by a second base station of the second system is measured. When the measured value of the quantifiable parameter passes through a first predetermined level, the mobile station communicates a signal quality message via a first base station of the first system to a first mobile switching control station. A channel request message is then communicated from the first mobile switching control station to a second mobile switching control station within the second system. At the second base station, a quantifiable parameter of the signal received from the mobile station is also measured. The second base station establishes communication with the mobile station when the measured value of the quantifiable parameter passes through a predetermined level. Alternately, the signal strength of a first pilot signal transmitted by the first base station is measured at the mobile station. A handoff request message is then sent to the second base station when the measured signal strength of the first pilot signal becomes less than a second predetermined level, thereby mobile station communication to be established. The provision of a voice link between the mobile switching control stations allows for the forwarding of an existing connection between the first and second cellular systems, and enables the performance of soft intersystem handoffs.

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