# O-RAN.WG7.DSC.0-v02.00
###### tags: `Spec`

## Deployment Scenarios and Base Station Classes

* Deploy Scenarios

eMBB
URLLC

* Base Station Architecture: Background
* Split Architecture
* Integrated architecture

## Split Architecture


* Note that the term optional is used to indicate there may be a deployment case where a switch or FHGW may not be needed
* O-CU shall be located at the data center and O-DU can be placed either at the data center or at the cell site

* following three criteria

* O-RAN WG4 (open fronthaul interface group) released interfaces
* O-RAN approved publicly (e.g., small cell forum or etc.) available external interfaces
* Fronthaul interfaces made available and published as part of an O-RAN approved WG7 reference design

* associated terminologies will be used throughout all WG7 specifications
* O-DU~7-2~ ↔ FHGW~7-2→8~ ↔ O-RU~8~
* where the fronthaul gateway does not perform a protocol translation
* O-DU~6~ ↔ FHGW~6~ ↔ O-RU~6~
* O-DU~7-2~ ↔ FHGW~7-2~ ↔ O-RU~7-2~
* O-DU~8~ ↔ FHGW~8~ ↔ O-RU~8~
(split finction is in wg4)
* split function
* Split option 6
* All PHY functions will reside in O-RU~x~ while MAC functions will be performed in O-DU~x~. In other words, only un-coded user data is on FH. In this case the terminology O-DU~6~ and O-RU~6~ is used.
* Split option 7-2
* the PHY is split into High and Low PHY functions where High PHY functions (coding, rate matching, scrambling, modulations and layer mapping) are performed in O-DU~x~ while O-RU~x~ performs the Low PHY functions (precoding, remapping, digital beamforming, IFFT and CP insertion). All I/Q samples are in frequency domain. In this case the terminology O-DU~7-2~ and O-RU~7-2` is used
* split option 8
* All PHY functions are performed in O-DUx. This means that O-RU~x~ function is limited to RF to baseband conversion and vice versa. The I/Q samples on FH interface are in time domain. In this case the terminology O-DU~8~ and O-RU8 is used.


## Deployment Scenarios

### Indoor Picocell


### Outdoor Picocell



### Outdoor Microcell



### Integrated access and backhaul (IAB)



### Outdoor Macrocell


## Base Station Type Classification


### Indoor
#### split function
#### The integrated architecture

### Outdoor
#### Picocell
#### Microcell

### Integrated access and backhaul (IAB)
#### Macrocell

### Key performance indicators
#### peak data rate
#### Peak spectral efficiency
* Peak spectral efficiency (bps/Hz) = Peak data rate (bps)/ bandwidth (Hz).
#### Bandwidth
#### Control plane latency
#### User plane latency
#### Mobility