Deployments Scenarios for 5G NR

NR is capable of working in Non-standalone as well as standalone deployments, the Phase 1 deployment is to be considered as Non-standalone deployments. In terms of cell layout, A 5G NR cell can be deployed in both homogeneous and heterogeneous deployments and be following three cases can be considered.

• Case #1 Homogeneous deployment where LTE cell and NR cells provide the similar coverage, this will happen when NR is operating in the same band as LTE is operating. In this deployment, cells are co-located cells

• Case #2 Heterogeneous deployment where LTE and NR cells are a different size. In this kind of deployment LTE cell is large cell size to meet coverage requirement while NR cell size is small to meet the capacity requirements. Here the NR cell can be deployed as a co-located cell or a non-located cell as a hot spot.

• Case#3  Heterogeneous deployment where LTE and NR cells are a different size. In this kind of deployment NR cell is large cell size to meet coverage requirement while LTE cell size is small to meet the capacity requirements. Here the NR cell can be deployed as a co-located cell or a non-located cell as a hot spot.

4G LTE and 5G NR Radio Network Architecture 
The deployment scenarios in terms of Core Network-RAN connection can be the following:
LTE eNB is a master node

This network topology is going to be most famous for the Phase 1 non-standalone deployments. LTE eNB will be master and anchor the NR cell. All the signaling procedure shall be done at LTE cell.

gNB is a master node

This network deployment shall be part of phase 2 where NR cell shall have stand-alone operational capabilities and it shall capable of anchoring the eLTE eNB. All signaling procedure shall be done at NR cell.

eLTE eNB is a master node

An eLTE eNB shall have capabilities to communicate the Next Gen Core network. A release 14/release 15 LTE cell can be considered as eLTE eNB. Here eLTE cell can be deployed standalone with Next Gen Core or eLTE eNB connected with Next Gen Core anchoring a non-stand alone NR cell.

Individual RAT with Inter Mobility

In this network topology, both LTE and NR Radio access network are connected to their respective Core network to operated in a standalone environment and supporting mobility for LTE to NR cell and visa verse.

Inter-working with WLAN

In phase 2 , when NR is capable to work as a standalone cell , it can be further enhanced to inter work with WLAN for Wi-Fi offloading and to utilize the benefits of the unpaid spectrum.

Sources :
http://www.techplayon.com/deployments-scenarios-for-5g-nr/

5G NR Total Transmit Power | Maximum Cell Transmit Power | Reference Signal Power

The Reference Signal Power and the total transmit power of the cell can calculated by using a single channel power using following formula,

• Maximum Transmit Power indicates the transmit power in dBm per single channel
• Reference Signal Power is the power in dBm per RE of single channel
• RBcell indicate total RB number based on the cell bandwidth each RB with 12REs

Example Calculation
Consider a system is configured with Max Transmit Power as 40 dBm (10 watt per channel) and calculation can be done with different sub-carrier spacing
Sub-carrier Spacing 15 KHz 270 RBs with 50MHz

• Reference Signal Power = 40 – 10 x log10（270 x 12)  = 40 – 35.10
• Reference Signal Power = 4.9 dBm

Sub-carrier Spacing 30 KHz 273 RBs with 100MHz

• Reference Signal Power = 40 – 10 x log10（273 x 12)  = 40 – 35.15
• Reference Signal Power = 4.85 dBm

Sub-carrier Spacing 60 KHz 130 RBs with 100MHz

• Reference Signal Power = 40 – 10 x log10（130 x 12)  = 40 – 31.93
• Reference Signal Power = 8.07 dBm

If you not able to co-related the carrier spacing with RB count please read our older post 5G New Radio Throughput Calculation embedded PDF page 6 or NR Resource Block Definition and RBs Calculation
The total transmit power of NR base station can be calculated taking Max Transmit power and No. of Tx antenna into account with following formula.

Consider same 40 Bm as cell Max power, the total Tx power can be calculated for different antenna configurations e.g. 8 antenna , 16 antenna, 64 antenna and 128 antenna systems.

• Total Transmit Power with 8 Tx Antenna = 40 + 10 x log10 (8) = 40 + 9.03            =49.03 dBm
• Total Transmit Power with 16 Tx Antenna = 40 + 10 x log10 (16) = 40 + 12.04       =52.04 dBm
• Total Transmit Power with 64 Tx Antenna = 40 + 10 x log10 (64) = 40 + 18.06      =58.06 dBm
• Total Transmit Power with 128 Tx Antenna = 40 + 10 x log10 (128) = 40 + 21.07   =61.07 dBm

Note: Total Transmit Power had included antenna gain (directive gain in dBi) which is used to calculated Equivalent Isotropical Radiated Power (EIRP).
Related Post: http://www.techplayon.com/5g-nr-total-transmit-power-maximum-cell-transmit-power-reference-signal-power/

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LTE RESOURCES & THROUGHPUT in Microsoft Excel

LTE RESOURCES & THROUGHPUT in Microsoft Excel
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