5G/NR - tdd UL/DL Common Configuration                             Home : www.sharetechnote.com

tdd UL/DL Common Configuration

When operating in TDD mode, we have to clearly define on exactly when to expect the transmission and when to expect the reception. In LTE TDD, we defined 7 predefined pattern for UL and DL allocation in a radio frame. In 5G/NR, we don't have any predefined pattern. Instead, we can define the pattern in much more flexible way using several parameters as shown below.

These parameters are defined in 38.331 as follows :

dl-UL-TransmissionPeriodicity : Periodicity of the DL-UL pattern

nrofDownlinkSlots : Number of consecutive full DL slots at the beginning of each DL-UL pattern  

nrofDownlinkSymbols : Number of consecutive DL symbols in the beginning of the slot following the last full DL slot

nrofUplinkSlots : Number of consecutive full UL slots at the end of each DL-UL pattern

nrofUplinkSymbols : Number of consecutive UL symbols in the end of the slot preceding the first full UL slot

Reference

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