The use of TDD (Time Division Duplex) across the UMTS air interface to offer low range asymmetric data flows appear an attractive option to operators who are planning to offer 3G data hotspots to subscribers. This module explores UMTS TDD operation in detail and discusses the frame formats and procedures that may be used across the air interface. The module also describes the issues surrounding TDD operation such as cell blocking and power control as well as the advantages that can be leveraged from such a system.
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