Fractional Frequency Reuse with Enhanced Scheduling Strategies
- PDF / 1,393,062 Bytes
- 13 Pages / 439.37 x 666.142 pts Page_size
- 97 Downloads / 193 Views
Fractional Frequency Reuse with Enhanced Scheduling Strategies B. Jesvin Veancy1 · P. Yogesh2 Accepted: 11 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Heterogeneous networks are used to meet both capacity and coverage demands in a cellular network. As the frequencies are reused due to the limited spectrum availability, there exists co-channel interference (CCI) between the high power and low power nodes in such networks apart from the CCI between high power nodes. Inter cell interference coordination (ICIC) is a big challenge towards heterogeneous network deployments since users located at the cell range expansion (CRE) area are more vulnerable to stronger interference caused by the signals from the high power nodes. To enhance capacity, achieve good user experience and improve spectral efficiency interference management techniques like fractional frequency reuse (FFR) with enhanced scheduling strategies and ICIC using expectation maximization algorithm are proposed to mitigate the effects of the CCI. The resource allocation in FFR is done for the users in the cell center (full reuse) and CRE (partial reuse) regions based on the optimum post processing signal to interference plus noise ratio threshold with different schedulers in the two regions. It is shown that a particular combination shows the best throughput performance for the proposed enhanced FFR scheme. Keywords Cellular network · Co-channel interference · Fractional frequency reuse · Heterogeneous network · Scheduling
1 Introduction Spectrum is a scarce natural resource, and it needs to be used in an efficient manner. It is a tremendous job to increase the system capacity in such bandwidth limited wireless environment. The initial phase of the development of the wireless technology was aimed at utilizing the spectrum more efficiently by adopting various techniques like frequency reuse, using multiple antennas at both transmitter and receiver ends (a.k.a.multiple input multiple output (MIMO) system), and also using technologies like orthogonal frequency division multiplexing (OFDM) that allows overlapping of subcarriers. The cellular network apply frequency reuse by reusing the same frequency in every cell leading to * B. Jesvin Veancy [email protected] 1
Easwari Engineering College, Chennai, India
2
Anna University, Chennai, India
13
Vol.:(0123456789)
B. J. Veancy, P. Yogesh
co-channel interference (CCI) from nearby cells. Traditionally, the CCI was avoided by reusing the same frequencies only in far off cells [1]. The network is evolved over time due to the increased data rate requirements by shrinking the cell size further to increase such capacity demands. Moreover, the network became reuse one or full reuse with the same frequency reused in every cell making the CCI more severe in such scenarios [2]. When multiple antennas are used at the transmitter and receiver to increase the spectral efficiency, the interference problem from adjacent cells became much worse [3]. Furthermore, as mor
Data Loading...
