Portable base station architecture for an AD-HOC ATM lan
First Claim
1. A portable base station (PBS) switching apparatus for communicating ATM cells, said apparatus comprising:
- one or more input ports for receiving incoming ATM cells;
one or more output ports for transmitting ATM cells; and
ATM switching fabric, said ATM switching fabric adapted for destination routing of said incoming ATM cells, said switching apparatus having a unique identification assigned thereto, wherein said switching fabric is operable to perform VPI translation on only said ATM cells having a destination VPI corresponding to said unique identification of said switching apparatus.
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Abstract
The present invention is a portable base station (PBS) switching device for use in a wireless ATM local area network (LAN). The PBS includes a plurality of high speed interfaces which operate, for example, in the Gb/s range and which are adapted to couple to other PBS s in the network. The high speed interfaces are coupled to an ATM switching fabric adapted to selectively route incoming ATM cells to an appropriate output port in said PBS without any VPI (virtual path identifier) translation at transit PBSs. The PBS includes wireless interface and processor unit for coupling to mobile users which may include laptop and notebook computers. Memory is included within the processor unit for selectively storing ATM cells according to their VPI. In one preferred embodiment of the PBS a passive optical unit is used to transmit and receive data between PBSs. The passive optical unit may include a laser transmitter and optical receiver.
390 Citations
26 Claims
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1. A portable base station (PBS) switching apparatus for communicating ATM cells, said apparatus comprising:
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one or more input ports for receiving incoming ATM cells; one or more output ports for transmitting ATM cells; and ATM switching fabric, said ATM switching fabric adapted for destination routing of said incoming ATM cells, said switching apparatus having a unique identification assigned thereto, wherein said switching fabric is operable to perform VPI translation on only said ATM cells having a destination VPI corresponding to said unique identification of said switching apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A portable base station (PBS) switching device for communicating ATM cells, said device comprising:
switching means, said switching means including, one or more high speed interfaces adapted to transmit and receive ATM cells from one or more PBS switching devices, ATM switching fabric, said ATM switching fabric adapted to selectively route a nonempty set of VPIs including destination VPI identifications, wherein said ATM cells are routed to appropriate one or more output ports in said high speed interfaces without any VPI translation in PBS not directly coupled to a destination mobile user, said VPI translation occurring at the PBS having an unique identification corresponding to the destination VPI identifications of said ATM cells. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for transmitting ATM cells in a network comprised of portable base station switching nodes, said nodes including at least one high speed interface adapted for communication with other said nodes in said network and a switching fabric adapted for destination routing of incoming ones of said ATM cells, each of said nodes having a unique identification corresponding thereto, said method comprising the steps of:
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routing said ATM cells from one switching node to a next one switching node based on a destination address included in a VPI field of said ATM cells; and only translating the VPI at the switching node having said unique identification equal to said destination address of said ATM cells. - View Dependent Claims (25, 26)
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Specification