Friday, May 17, 2013

Why first and sixth subframe are always assigned to DL in LTE TDD

The first and sixth subframe of each frame (subframe 0 and subframe 5) are always assigned to downlink transmission while remaining subframes can be flexibly assigned to be used for either downlink and uplink. The reason for the predefined assignment of the first and sixth subframe for downlink transmission is that these subframes include the LTE Synchronization signals. The synchronization signals are transmitted on the downlink of each cell and are intended to be used for initial cell search as well as for neighbor-cell search.

 From Book :

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