14
Parameter
Assumption
Unit
Propogation Model
UMa (Urban/Sub Urban Marco)
Ref: 3GPP TS 38.901
SCS
120
KHz
CP Noise Figure
7
dB
gNB Noise Figure
6
dB
MIMO
2x2
Tx/Rx
Channel Model
CDL (D)
Ref: 3GPP TS 38.900
Table 4: 28 GHz LB assumptions
Typical link budget at 28 GHz frequency is shown in Table 3:
DL Link Budget
Value
UL Link Budget
Value
Typical Total EIRP/100 MHz
Typical Total EIRP/100 MHz
60 dBm 1
41 dBm 1
Receiver Sensitivity
Receiver Sensitivity
-84.4 dBm 2
-87.6 dBm 2
MAPL
149.5 dB
MAPL
149.8 dB
MAPL clutter losses considered
MAPL clutter losses considered
121.5 dB 3
121.2 dB 3
Table 5: UL & DL link budget at 28 GHz
Based on the labels in the above table:
1. The total EIRP at gNB is calculated as considering transmit power plus beam forming antenna gain. The EIRP at CPE is calculated as considering 33 dBm (2W) transmit power and 8 dBi antenna gain. 1 2. Receiver sensitivity is calculated as = Noise figure (dB) + Thermal noise (dBm) + SINR (dB). Noise figure is considered as per values in Table 4. The required SINR values are achieved considering the cell edge throughput target 50 Mbps in DL and 10 Mbps in UL and MCS index table 1 for PDSCH as per 3GPP TS 38.214. 2 3. Clutter losses are significant in mmWave, clutter losses of ~28 dB (vegetation losses, penetration losses (concrete walls/toughened glass), standard deviation) are considered. 3 This link budget gives a RNP design target of approximately -103 dBm with coverage probability of 95%.
Deployment scenarios /use cases (FWA/enterprise, small cells/hotspots)
Based on the market analysis the prominent use case of mmWave seems to be FWA and small cells for hotspots, for which we have simulated coverage and throughput in our planning exercise.
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