Main Parameters for Spectrum Bandwidth Demand Estimations

The required bandwidth for any specific radiocommunication network, i.e. also the future 5G networks,
greatly depends on the following three parameters:

1) The targeted QoS. This parameter may differ to a large extent, depending on the service provided by the network. For 5G, the mix of the three main usage scenarios (eMBB, mMTC and
URLLC) needs to be considered. One key aspect to be taken into account for QoS is the prediction of traffic patterns for different services.

2) The area spectral efficiency. This parameter is expressed in bit/s/Hz/cell and describes how efficiently, in terms of the data rate per bandwidth per cell, the available spectrum is used.
Innovations currently under standardization or research will greatly impact the achievable area spectral efficiency in 5G and its foreseeable evolution. The area spectral efficiency can be
increased by enhancing the achievable single link spectral efficiency within an individual transmission reception point (TRP), for instance through higher order modulation and coding schemes, massive multiple input‐multiple output (MIMO) or interference cancelation technologies. Also, the coordination of several TRPs present in the area, for instance in the form of advanced inter-cell interference coordination (ICIC) and coordinated multi‐point
(CoMP) can increase the area spectral efficiency.


3) Physical deployment of network, TRPs and user distributions. The number of network TRPs in high traffic density areas has been substantially increased in current legacy networks, with the provision of different levels of small cells, in order to maintain the QoS with the same amount of spectrum bandwidth. However, this high density deployment has a clear impact on both capital expenditures (CAPEX) and operational expenditures (OPEX) associated with the provision of the service, which could be unsustainable from an economic point of view. Realistic estimations on user density distributions and TRP deployments are needed in order to perform an adequate evaluation of the required spectrum bandwidth. Parameters like the speed of users or moving TRPs will also have an impact on the final achievable spectral efficiency of the associated links and thus the required bandwidth.

The Reference :

5G System Design
Architectural and Functional Considerations and Long Term Research