Adaptive Power Ratio Updating Algorithm in Soft Frequency Reuse Scheme

Abstract

Soft fractional frequency reuse (SFR) is adopted as a main inter-cell interference coordination technique in the orthogonal frequency division multiplexing access(OFDMA) networks. In the paper, unlike the fixed power ratio configuration in other published papers, an adaptive power ratio updating in SFR scheme (APR-SFR) is explored. In each time slot, users measure the interference form other cells and report the signal to interference plus noise ratio to the associated cell. Then each base station updates the power ratio of SFR scheme adaptively and distributively based on the current interference situation to maximize the sum-rate of cell. The convergency characteristic of APR-SFR scheme is discussed and we prove APR-SFR is convergent with a proper updating ratio. Finally, we develop a LTE simulation platform with 7 cells to evaluate the proposed APR-SFR algorithm. The numerical results show that APR-SFR algorithm is flexible for different number of users and can get the better system performance than other algorithms.

QoS priority‐based coordinated scheduling and hybrid spectrum access for femtocells in dense cooperative 5G cellular networks

“…In order to reduce cochannel interference, various kinds of techniques have been considered in the literature, including our previously proposed dynamic frequency band allocation, by considering users' quality of service (QoS) priority among eNBs and FeNBs, group formation of FeNBs by exchanging information among neighboring FeNBs, power control (PC) approaches, and game theory‐based scheduling and femtocells clustering . Among all the previously proposed schemes, it has been noticed that cooperation between eNBs and FeNBs provides more benefits in terms of QoS, fairness, and load balancing, but at the cost of a little increase in feedback complexity in terms of sharing channel state information (CSI). Thus, in this paper, we consider cooperative communications or coordinated multipoint (CoMP) transmission, for capacity enhancement in interference‐limited cellular networks.…”

Performance Evaluation of Joint Power and Frequency-Domain Intercell Interference Coordination in Heterogeneous Networks

“…In the method, a protected band is defined within the overall system bandwidth, which is exclusively used by only pico BSs, in order to alleviate the macro-to-pico interference [1-3, 8, 9]. In the remaining frequency band, which is called the non-protected band in this paper, we employ fractional frequency reuse (FFR) at the macro BSs so that the macro-to-macro ICIC is achieved [10][11][12][13][14]. Furthermore, in [15], the bandwidth allocation to the protected band and the transmission power of the macro BSs are jointly and adaptively controlled from the viewpoint of proportional fairness (PF) [16,17].…”

Distributed transmission power control method based on soft FFR for cellular downlink

“…Fractional frequency reuse (FFR) methods were proposed that allow users under different channel conditions to enjoy different reuse factors [5][6][7][8][9][10][11]. The FFR methods basically use a lower reuse factor for cell-edge users, since these users are close to a neighboring base station (BS) and severe inter-cell interference is expected if the same frequency is reused.…”

“…The studies in [8] and [9] investigate the power allocation methods in SFR assuming inter-BS cooperation. In [10] and [11], decentralized power allocation methods for SFR are investigated, aiming at the maximization of the sum user throughput.…”