Dynamic strict fractional frequency reuse for software-defined 5G networks

Abstract

The surge of mobile data traffic has spurred academia and industries to begin developing 5G networks. 5G is meant to overcome limitations of 4G cellular technology relying on the dominant trend of mobile network densification with the deployment of small cell base stations. To accelerate this process, low complexity and inexpensive remote radio heads (RRHs) are deployed massively and connected to a centralized pool of resources. In this work, we study the problem of inter-cell interference (ICI) which arises in frequency reuse one multi-tier 5G networks. We entrust the management of RRHs to a softwaredefined network controller and we take advantage of network functions virtualization. Our contributions consist of proposing Dynamic Strict Fractional Frequency Reuse (DSFFR), a method to relieve ICI which dynamically divides the small cell area in a different number of sectors. Furthermore, we formulate a joint scheduling problem composed of two schedulers which operate at different time granularity to transmit downlink packets. Modeling the coverage area with the tool of stochastic geometry and solving with simulations the joint scheduling problem, we are able to show that DSFFR outperforms the static scheme. Performance are addressed in terms of spectral efficiency and packet blocking probability

Impact of Resource Blocks Allocation Strategies on Downlink Interference and SIR Distributions in LTE Networks: A Stochastic Geometry Approach

“…It simply adds a factor in terms of variance (cf. (20)). We simulate the different strategies through a simulator coded in C available here (http://www.anthonybusson.fr/index.php/publications).…”

“…In all simulations and numerical results we consider 50 eNodeB. The different sums in the equations (e.g., (10) and (20)) are then limited to 50. For each set of parameters, simulations have be run from 10,000 to several millions times depending on the evaluated quantities.…”

“…This work is generalized in [18,19] to the context of K-tier and heterogeneous networks considering different point processes for each tier or network technology. It is also extended and studied in [20] with the dynamic strict FFR (DSFFR) where the edges of the cells are dynamically divided into sectors with the help of directional antennas. In [21], a coordinated beamforming is employed to ensure that a set of closed BS, "a cluster", will use different resources.…”

Optimal management of reusable functional blocks in 5G superfluid networks

“…Bouras et al provide a techno‐economic analysis for the introduction of softwarization technologies in the 5G network architecture, with a cost model to estimate the CAPEX and OPEX of the proposed architecture. Gebremariam et al proposed two scheduling solutions to manage the remote radio heads (RRHs) unit and control intercell interference. They assumed that small cell coverage area can be dynamically divided in different numbers of sectors to take into account traffic loads and interference suffered from interior and cell edge users.…”

Resource Allocation and Interference Management Techniques for OFDM-Based VLC Atto-Cells

“…Super and regular subcarrier groups serve both center and edge users in the entire area and the sector. In [15], the authors suggested that the dynamic strict FFR would depend on the spatial scheduling of channels that would eliminate interference. The cell is dynamically divided into sectors, unlike the strict static FFR, which divides it into three static sectors.…”