Fast-Lipschitz Power Control and User-Frequency Assignment in Full-Duplex Cellular Networks

Abstract

Abstract-In cellular networks, the three-node full-duplex transmission mode has the potential to increase spectral efficiency without requiring full-duplex capability of users. Consequently, three-node full-duplex in cellular networks must deal with selfinterference and user-to-user interference, which can be managed by power control and user-frequency assignment techniques. This paper investigates the problem of maximizing the sum spectral efficiency by jointly determining the transmit powers in a distributed fashion, and assigning users to frequency channels. The problem is formulated as a mixed-integer nonlinear problem, which is shown to be non-deterministic polynomial-time hard. We investigate a close-to-optimal solution approach by dividing the joint problem into a power control problem and an assignment problem. The power control problem is solved by FastLipschitz optimization, while a greedy solution with guaranteed performance is developed for the assignment problem. Numerical results indicate that compared to the half-duplex mode, both spectral and energy efficiencies of the system are increased by the proposed algorithm. Moreover, results show that the power control and assignment solutions have important, but opposite roles in scenarios with low or high self-interference cancellation. When the self-interference cancellation is high, user-frequency assignment is more important than power control, while power control is essential at low self-interference cancellation. I. INTRODUCTIONIn order to meet the need for explosive data volumes and data rates, wireless network operators seek to enhance the spectral efficiency in lower-frequency bands [1], and to exploit higher-frequency bands such as the millimiter waves. The research and standardization communities are currently studying physical layer technologies, including massive MIMO systems, spectrum sharing in mmWave networks, new waveforms, non-orthogonal multiple access technologies, and full-duplex communications [2], [3].In-band full-duplex (FD) transceivers are expected to improve the attainable spectral efficiency of traditional wireless networks operating with half-duplex (HD) transceivers by a factor of two [3]. Due to recent advancements in mitigating the inherent self-interference (SI) by means of passive suppression, analog and/or digital cancellation, in-band FD technology is quickly approaching the phase of commercial deployments in low-power wireless networks [4].

Outage Analysis of User Pairing Algorithm for Full-Duplex Cellular Networks

“…As a result, coexistence of both UL and DL transmission on the same channel at the same time in the FD cellular network causes 2 Wireless Communications and Mobile Computing so-called interuser interference from UL users to DL users. Therefore, smart interference management techniques are necessary to manage this interuser interference and several algorithms including resource management, power control, user pairing/scheduling, and their optimization have been investigated to enhance performances in terms of system throughput, outage probability, and coverage [9][10][11][12][13][14][15][16][17][18][19][20].…”

“…In [13], an effective power control scheme was proposed to suppress interference between D2D and cellular communications for FD relay-assisted device-to-device communication. In [14], a distributed power control algorithm was suggested based on Fast-Lipschitz optimization to maximize the sum spectral efficiency in the three-node FD transmission mode.…”

Joint user association, subchannel assignment, and power allocation in full‐duplex OFDMA heterogeneous networks

“…The resulting problem is then approximated into two convex subproblems, which are solved iteratively. Other works maximize the network sum rate through subchannel assignment and power allocation in an FD single cell. In the work of da Silva et al, the power control problem is solved by Fast‐Lipschitz optimization while the subchannel assignment is performed by using a greedy algorithm.…”

“…Other works maximize the network sum rate through subchannel assignment and power allocation in an FD single cell. In the work of da Silva et al, the power control problem is solved by Fast‐Lipschitz optimization while the subchannel assignment is performed by using a greedy algorithm. Di et al formulate the user‐pairing and subchannel allocation problem in the form of a three‐sided matching problem and propose a matching algorithm to solve it.…”

“…Di et al formulate the user‐pairing and subchannel allocation problem in the form of a three‐sided matching problem and propose a matching algorithm to solve it. However, in both works, as the number of users increases, the gap between the proposed and the optimal solutions becomes significant. In the work of Sun et al, the problem of joint power and subcarrier allocation is solved by exploiting successive convex approximation (SCA) method.…”