Cell selection techniques for use in cellular communications systems are disclosed. A decision as to whether to use a cell for data transmission is made in dependence on a measure of a congestion level in the cell. The decision may either be part of a cell selection decision, or used to override a cell selection decision. The techniques may be used in fast cell site selection.

 
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> System using network topology to perform fault diagnosis to locate fault between monitoring and monitored devices based on reply from device at switching layer

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