Page 1079 - 5G Basics - Core Network Aspects

Transport aspects 2

V.4 Memory size example

Assumptions:
• TF: 0.75ms
• NSYM: 35 symbols
• NSYMack+ NSYMret: 20 or 30 symbols
• Target average downstream bit-rate: 500 Mbit/s

Table V.1 presents the downstream retransmission memory size for number of different scenarios
assuming case 2.

Table V.1 – Example for downstream retransmission memory size

Down/Up allocation 90%/10% 50%/50%
{Mds, Mus} {31, 4} {18, 17}
NSYMack+NSYMret
20 72.6 KBytes 57.3 KBytes
30 87.7 KBytes 83.3 KBytes

For the worst case calculation (case 3), a memory size equal to one DTU should be added to each entry in
Table V.1.

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