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    • 74. 发明公开
    • Mobile satellite communications system using multiple earth stations
    • Mobile Satellitenkommunikationsanordnung,mehrere irdische Stationen verwendend
    • EP1482659A2
    • 2004-12-01
    • EP04020849.8
    • 2001-07-09
    • Ericsson Inc.
    • Wilkinson Dent, Paul
    • H04B7/185
    • H04B7/18515
    • A satellite communications system uses multiple ground stations and one or more satellites for communicating between mobile subscribers and a land-based communications network, such as the PSTN or the Internet. Multiple ground stations geographically dispersed minimize toll charges incurred routing calls from a mobile subscriber through the land network by reducing the need for long-distance calling. Further, because each ground station communicates with a given satellite using the same frequency spectrum, the subscriber capacity of the system increases and/or bandwidth requirements for the communications link between ground stations and satellites may be reduced. The present system uses ground-based beamforming techniques enabling each satellite to transmit signals in multiple transmission beams, each beam supporting one or more mobile subscribers. Each beam may reuse the same frequency spectrum, thereby increasing the number of subscribers supported by each satellite. Multiple ground stations cooperatively relay signals through a given satellite in a manner complementary with ground-based beamforming.
    • 卫星(100a,100b)提供移动终端服务区域的良好覆盖,并且如果存在无障碍视图,地面站(200)可以与所有卫星通信。 地面站允许移动终端连接到尽可能靠近对方的网络,并且馈线链路天线(201)朝向卫星定向,以向上行链路频带中的卫星发送馈送链路信号。 包括用于在多个卫星之间通信的方法和用于从地面站向卫星发送信号的方法的独立权利要求。
    • 76. 发明授权
    • LOCAL NUMBER PORTABILITY
    • 电话号码可携
    • EP1013107B1
    • 2004-11-24
    • EP98946969.7
    • 1998-09-11
    • Ericsson Inc.
    • KASIVISWANATHAN, Rajan
    • H04Q3/00
    • H04Q3/005
    • A telecommunications system and method for managing Local Number Portability (LNP) querying for calls routed to Interexchange Carriers by providing a list of carriers in the Service Switching Point (SSP) (local service provider) for whom LNP querying is to be performed by the SSP. For example, calls destined to carriers on the list will be queried by the originating SSP, or other intermediate SSP, and calls destined for carriers not on the list will not be queried by the originating SSP, but instead will be directly routed to the carrier for LNP querying. Advantageously, the local service providers (SSPs) can perform LNP queries for calls destined to certain carriers and charge them for the queries. This will enable small long-distance carriers to provide competitive service in the network by purchasing the LNP querying facility from the SSPs. Furthermore, LNP querying will now be able to be provided for every call routed through an Interexchange Carrier (IXC), regardless of whether the IXC has LNP querying capability.