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    Handoff monitoring in cellular communication network using slow frequency hopping
    4.
    发明公开
    Handoff monitoring in cellular communication network using slow frequency hopping 失效
    与慢跳频的蜂窝式通信网络切换监视。

    公开(公告)号：EP0677940A2

    公开(公告)日：1995-10-18

    申请号：EP95104938.6

    申请日：1995-04-03

    申请人： International Business Machines Corporation

    发明人： Huang, Chia-Chi ,  Bantz, David Frederick ,  Bauchot, Frederic ,  Natarajan, Kadathur Subramanya ,  Narasimhan, Anand ,  Wetterwald, Michele Marie

    IPC分类号： H04L12/28 ,  H04Q7/38 ,  H04B7/26 ,  H04B1/713 ,  H04L1/20

    CPC分类号： H04W36/30 ,  H04B1/713 ,  H04W24/00 ,  H04W36/08 ,  H04W84/12

    摘要： Methods for handoff in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, with communication between base stations and mobile stations being performed by frequency hopping, with there being n available frequency hopping channels in a fixed frequency band, with each channel being of a same fixed duration and having a fixed frequency different than another channel. The handoff method employs structure and techniques for determining by a mobile station that the quality of transmission between it and a current base station has degraded below a predetermined performance level, structure and technique for said mobile station to listen to each of successive frequency channels for a duration substantially less than said fixed duration of a channel until it senses a transmission from another base station, and structure and techniques for transferring control of said mobile station to said another base station in response to the sensed transmission.

    Gateway having connection to voice and data networks
    9.
    发明公开
    Gateway having connection to voice and data networks 失效
    Gateway Verbindung zu Sprach- und Datennetzen

    公开(公告)号：EP0789470A2

    公开(公告)日：1997-08-13

    申请号：EP97300502.8

    申请日：1997-01-27

    申请人： International Business Machines Corporation

    发明人： Hortensius, Peter Dirk ,  Lumelsky, Leon ,  Narasimhan, Anand

    IPC分类号： H04L12/66

    CPC分类号： H04L12/2898 ,  H04L12/2856 ,  H04L12/66 ,  H04M3/487 ,  H04M3/54 ,  H04M7/0009 ,  H04M7/12 ,  H04M11/06 ,  H04M2203/2066 ,  H04Q2213/13093 ,  H04Q2213/13107 ,  H04Q2213/13141 ,  H04Q2213/13196 ,  H04Q2213/13199 ,  H04Q2213/13204 ,  H04Q2213/13389 ,  H04Q2213/13396

    摘要： A gateway 150 enables point to multipoint connectivity from voice, data, or SVD clients over voice and data networks. The gateway connects one or more known voice networks 115 (e.g. telephone networks) and one or more data networks 110 (e.g. LANs, WANs, and internet) so that clients on either network may access any of the networks via various devices like analog telephones 135, data modems, SVD modems 144, or direct data network connections (e.g., ethernet, token ring). The gateway has connections to both the data network(s) as well as the voice network(s). The gateway is capable of splitting a signal with both voice and data streams and routing either and/or both of these streams over the voice network alone, the data network, or both. A process, executing on the gateway enables the gateway to establish connections on gateway paths and to control and direct a flow of voice and data information between the destinations on these networks.

    摘要翻译： 网关150通过语音和数据网络实现来自语音，数据或SVD客户端的点对多点连接。 网关连接一个或多个已知的语音网络115（例如电话网络）和一个或多个数据网络110（例如LAN，WAN和因特网），使得任一网络上的客户端可以经由诸如模拟电话135之类的各种设备访问任何网络 ，数据调制解调器，SVD调制解调器144或直接数据网络连接（例如，以太网，令牌环）。 网关具有与数据网络以及语音网络的连接。 网关能够分离具有语音和数据流的信号，并且通过语音网络，数据网络或两者在这些流之间路由和/或两者。 在网关上执行的过程使得网关能够在网关路径上建立连接，并且控制和引导这些网络上的目的地之间的语音和数据信息流。

    Method and apparatus for direct communication in an TDMA radio communication system
    10.
    发明公开
    Method and apparatus for direct communication in an TDMA radio communication system 失效
    电子邮件中的Verfahren und Vorrichtungfürdirekte Verbindung TDMAFunkübertragungssystem

    公开(公告)号：EP0713345A2

    公开(公告)日：1996-05-22

    申请号：EP95118051.2

    申请日：1995-11-16

    申请人： INTERNATIONAL BUSINESS MACHINES CORPORATION

    发明人： Chieu, Trieu Chan ,  Narasimhan, Anand ,  O'Neil, Gary Ernest ,  Zai, Li-Cheng R.

    IPC分类号： H04Q7/38 ,  H04Q7/30 ,  H04B7/26

    CPC分类号： H04M1/72513 ,  H04B7/2656 ,  H04M1/72508

    摘要： Direct communication between a primary portable unit initiating the communication and a secondary portable unit is established utilizing two handshaking operations. The first handshaking operation is performed in the base station channel to establish initial contact between the primary and secondary portable units. After initial contact is made, the second handshaking operation is performed to establish communication in an unoccupied channel. The base station channel and the unoccupied channel may be a TDMA/TDD channel or a TDMA/FDD channel.

    摘要翻译： 利用两次握手操作建立起始通信的主要便携式单元与第二便携式单元之间的直接通信。 在基站信道中执行第一次握手操作，以建立主要和第二便携式设备之间的初始接触。 进行初次接触后，执行第二次握手操作以在未占用频道中建立通信。 基站信道和未占用信道可以是TDMA / TDD信道或TDMA / FDD信道。