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    • 1. 发明申请
    • SYSTEM AND METHOD FOR IMPLEMENTING LOCAL BASE STATIONS
    • WO2002001802A3
    • 2002-01-03
    • PCT/CA2001/000937
    • 2001-06-27
    • RESEARCH IN MOTION LIMITEDWANDEL, MatthiasMOUSSEAU, Gary, P.
    • WANDEL, MatthiasMOUSSEAU, Gary, P.
    • H04L12/28
    • A system and method for implementing local base stations is provided. The system includes a plurality of mobile devices (20), a local area network (LAN) (14) , and a plurality of local base stations (44,46) coupled to the LAN. Each local base station in the system has a unique address on the LAN, and is configured to transmit and receive data packets to and from the mobile devices. Using the unique address assigned to a particular local base station, the data packets may be transferred between local base stations over the LAN. Each local base station in the system may include a central processing unit (CPU) coupled to a sound card and a network interface card, and a transmitting and receiving means that sends and receives modulated RF signals to and from the mobile devices. The sound card is configured to demodulate an incoming RF signal to produce an incoming frame of data, and to generate an outgoing modulated RF signal from an outgoing frame of data. Each local base station may also include a software module executed by the CPU and configured to extract a packet of data from the incoming RF signal and encode the packet of data into an outgoing datagram that includes addressing information enabling the outgoing datagram to be directed to another local base station over the LAN, and also configured to extract a data packet from an incoming datagram received from the LAN and encode the data packet into the outgoing frame of data tha includes information enabling the outgoing frame of data to be transmitted to the mobile device.
    • 9. 发明申请
    • SEAMLESS CALL SWITCHING IN A DUAL MODE ENVIRONMENT
    • 双模式环境中的无缝呼叫切换
    • WO2005051025A1
    • 2005-06-02
    • PCT/CA2004/001996
    • 2004-11-19
    • RESEARCH IN MOTION LIMITED
    • MOUSSEAU, Gary, P.WORMALD, Christopher, R.
    • H04Q7/38
    • H04W36/0066H04W36/18
    • Methods and apparatus for providing a seamless switching of voice calls between different wireless networks are disclosed. In one illustrative example, a mobile communication device has a processor and one or more wireless transceivers coupled to the processor. The one or more wireless transceivers include a first transceiver portion operative in accordance with a first wireless network (e.g. a GSM/GPRS cellular network) and a second transceiver portion operative in accordance with a second wireless network (e.g. an 802.11 wireless network). A voice call is maintained between the mobile device and a communication terminal through call control equipment. The processor of the mobile device is operative to maintain voice communications for the voice call over a traffic channel established between the mobile device and the first wireless network using the first transceiver portion ; cause a connecting call to be established with the communication terminal through the call control equipment in response to a predetermined condition, where the connecting call involves a traffic channel established between the second wireless network and the mobile device using the second transceiver portion ; and ­after the connecting call is established, maintain voice communications for the voice call over the traffic channel established between the second wireless network and the mobile device.
    • 公开了用于在不同无线网络之间提供语音呼叫的无缝切换的方法和装置。 在一个说明性示例中,移动通信设备具有耦合到处理器的处理器和一个或多个无线收发器。 一个或多个无线收发器包括根据第一无线网络(例如,GSM / GPRS蜂窝网络)操作的第一收发器部分和根据第二无线网络(例如802.11无线网络)操作的第二收发器部分。 通过呼叫控制设备在移动设备和通信终端之间保持语音呼叫。 移动设备的处理器可操作以通过使用第一收发器部分在移动设备与第一无线网络之间建立的业务信道上维护用于语音呼叫的语音通信; 响应于预定条件,通过呼叫控制设备与通信终端建立连接呼叫,其中连接呼叫涉及使用第二收发器部分在第二无线网络和移动设备之间建立的业务信道; 并且在连接呼叫建立之后,通过在第二无线网络和移动设备之间建立的业务信道来维护语音呼叫的语音通信。