Cellular communications network
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Feb 19, 1997
filing date -
May 27, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A communication network for an area such as an underground mine. A plurality of cascaded base stations (13) are serially interconnected in a ring structure (11) to form a network backbone. One of the base stations (13) at one end of the network backbone forms a network controller (15) for controlling the network. A plurality of portables (17) are adapted for communication with any of the base stations via a common air interface. A backbone network protocol (19) is provided for communicating between the network controller (15) and all of the base stations (13) and between the base stations (13) along the network backbone themselves. A common air interface protocol (21) is provided for communicating between a portable (17) and a base station (13). The other base stations (13) function as slaves relative to the network controller (15). Each slave base station (13) defines a discrete cell within which communication between a portable (17) disposed within a cell and the base station (13) generating the cell is able to be performed over the common air interface. A method of communicating using a startup procedure which assigns different operating carrier frequencies to each of the base stations for the common air interfaces of the cells therefor is also described.
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