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    53.
    发明专利
    未知

    公开(公告)号：DE69622387D1

    公开(公告)日：2002-08-22

    申请号：DE69622387

    申请日：1996-03-29

    Applicant: INMARSAT LTD

    Inventor： FELDMAN RAY ,  KAWAI NOBUYUKI ,  SMITH DOUGLAS ,  REMAEL FRANCOIS-ARNAUD

    IPC: H04L29/08 ,  H04B7/15 ,  H04B7/185 ,  H04L1/18 ,  H04L12/54 ,  H04L12/861 ,  H04L29/06 ,  H04M11/00 ,  H04M11/06

    Abstract: An interface (4;12) between a data terminal (2;18) and a digital communications link (6,8,10) implements protocols and frame formats designed to reduce delays in a data communication with a remote terminal (18;2). The interface (4;12) overcomes the need to send or receive an HDLC SABME or UA control signal, and allows data to be sent over the digital communications link (6,8,10) as soon as the communication parameters are established. In a non-ARQ (error correction) mode, the interface (4;12) sends control signals and data over the communications link (6,8,10) in frames subdivided into many small subframes of fixed length, each subframe having a length code. The interface (12), when arranged for connection to the data terminal (18) through a telephone network (14), encodes call progress signals from the telephone network (14) for sending over the digital communications link (6,8,10). The interface (4;12) encodes and decodes interrupt signals for sending between the data terminal (2;18) and the digital communications link (6,8,10) when an interrupt signal is detected.

    56.
    发明专利
    未知

    公开(公告)号：DK0948848T3

    公开(公告)日：2002-07-01

    申请号：DK97947774

    申请日：1997-12-04

    Applicant: INMARSAT LTD

    Inventor： MACRIDIS PHILIP ,  HARPER JOHN ANTHONY

    IPC: H04J3/00 ,  H04B7/185 ,  H04B7/212 ,  H04J3/16 ,  H04L12/70 ,  H04Q11/04 ,  H04W4/00 ,  H04W16/28 ,  H04W28/20 ,  H04W60/00 ,  H04W72/04 ,  H04W74/04 ,  H04W76/02 ,  H04W76/06 ,  H04W84/06 ,  H04W99/00 ,  H04B7/26 ,  H04Q7/22 ,  H04Q7/38

    Abstract: A satellite communications system provides a communications service to a mobile terminal (2) on which different communications applications (4a to 4d) may be run. Calls are set up between any of the applications (4a to 4d) via a satellite (12) to a network management centre (18) which provides different service adaptors (20a to 20d) which adapt the calls to different types of service provided over terrestrial networks (22), such as telephony, facsimile, internet or ATM services. The bandwidth allocated to each call over the satellite link may be varied during the call according to demand either from the relevant application (4) or from the network management centre (18). Multiple calls may be connected concurrently to or from different applications running on the mobile terminal. A maximum bandwidth is allocated to each call. Efficient use is thereby made of the limited bandwidth available over the satellite (12), according to the instantaneous bandwidth requirements of different applications (4). For real-time calls requiring multiple slots per frame in a TDMA channel, the slots are mutually spaced apart to reduce delay.

    Bandwidth allocation method and apparatus
    60.
    发明专利
    Bandwidth allocation method and apparatus 未知

    公开(公告)号：AU745629B2

    公开(公告)日：2002-03-28

    申请号：AU5401998

    申请日：1997-12-04

    Applicant: INMARSAT LTD

    Inventor： MACRIDIS PHILIP ,  HARPER JOHN ANTHONY

    IPC: H04J3/00 ,  H04B7/185 ,  H04B7/212 ,  H04J3/16 ,  H04L12/70 ,  H04Q11/04 ,  H04W4/00 ,  H04W16/28 ,  H04W28/20 ,  H04W60/00 ,  H04W72/04 ,  H04W74/04 ,  H04W76/02 ,  H04W76/06 ,  H04W84/06 ,  H04W99/00 ,  H04B7/26 ,  H04Q7/38

    Abstract: A satellite communications system provides a communications service to a mobile terminal (2) on which different communications applications (4a to 4d) may be run. Calls are set up between any of the applications (4a to 4d) via a satellite (12) to a network management centre (18) which provides different service adaptors (20a to 20d) which adapt the calls to different types of service provided over terrestrial networks (22), such as telephony, facsimile, internet or ATM services. The bandwidth allocated to each call over the satellite link may be varied during the call according to demand either from the relevant application (4) or from the network management centre (18). Multiple calls may be connected concurrently to or from different applications running on the mobile terminal. A maximum bandwidth is allocated to each call. Efficient use is thereby made of the limited bandwidth available over the satellite (12), according to the instantaneous bandwidth requirements of different applications (4). For real-time calls requiring multiple slots per frame in a TDMA channel, the slots are mutually spaced apart to reduce delay.

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