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• While using NSA mode the architecture is using EN-DC which means the control plane is managed through LTE and hence lower SCS is used. In this mode we can achieve high throughput network however cannot reach to the maximum potential of mmWave in terms of low latency. • One can also use mmWave in SA mode in the NR-DC architecture. In this mode we can achieve high throughput network and better latency as compared to EN-DC scenario. In this architecture also we must plan low/mid band frequencies for the control channel networks and the mmWave layer for the user plane. • Independent SA mode for only mmWave network will be feasible once the product ecosystem is ready. In this mode we can achieve the lowest latency possible using mmWave & higher throughput as well.
mmWave planning scenarios
Keeping in consideration the advantages and challenges in mmWave, RF planner needs to know exactly which are the high traffic density areas and ensure to plan the mmWave sites very close to these traffic areas. In this section we have explained the mmWave deployment scenarios, realized by Tech Mahindra’s planning team and InfoVista’s advanced planning tool. The various use cases which can be realized using mmWave spectrum can be broadly categorized into two:
1. FWA/Enterprise 2. Small cells/Hotspot
To achieve the end results of the planning process RF planner must go through several different activities. We have described the key activities involved in this process here.
Link Budget
For this link budget calculation, we have chosen an urban area as the area of interest. Further consideration is as below.
• Frequency: FR2/mmWave spectrum, n257 i.e., 28 GHz • Channel bandwidth: 100 MHz • Service target: 50 Mbps in downlink and 10 Mbps uplink.
• Radio transmit EIRP: 60 dBm • CPE transmit power: 33 dBm • CPE antenna gain: 8 dBi
Some key assumptions for this link Budget are as below:
Table 4: 28 GHz LB assumptions
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