A Graph Approach to Dynamic Fractional Frequency Reuse (FFR) in Multi-Cell OFDMA Networks

Chang, Ronald Y.; Zhang, Tao; Zhang, J.; Kuo, C.-C. Jay

doi:10.1109/icc.2009.5198612

Cited by 168 publications

(70 citation statements)

References 5 publications

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“…Also, they focused on optimal design of FFR systems by utilizing advanced techniques such as graph theory [8] and convex optimization [9] [10] to maximize network throughput. No one has studied the performance while changing the inner cell shape which will be focused by this paper.…”

Section: Introductionmentioning

confidence: 99%

Studying Optimal Design of Strict Fractional Frequency Reuse in OFDMA Cellular System

Nagieb¹,

Shokair²,

Saad³

2015

IJCA

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The key characteristic of a cellular network is the ability to reuse frequencies to increase both coverage and capacity. Fractional frequency reuse (FFR) is considered to be an efficient inter-cell interference coordination technique wellsuited for OFDMA based on wireless communication networks where the cells are partitioned into spatial regions with different frequency reuse factors. In this paper, evaluating strict FFR which represents a type of FFR deployments is presented with four different system models by changing the inner-cell shape for each model. System simulations are used to compare and evaluate the effect of changing the inner-cell shape based on strict FFR performance which performed using dense Monte Carlo simulations. In addition, the effects of some system model parameters are discussed.

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Section: Introductionmentioning

confidence: 99%

Studying Optimal Design of Strict Fractional Frequency Reuse in OFDMA Cellular System

Nagieb¹,

Shokair²,

Saad³

2015

IJCA

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“…The latest OFDMA mobile standards such as WiMAX and LTE allocate channels using a technique called Fractional Frequency Reuse (FFR) [7]. We consider FFR as a term of comparison, as we have found it is often the case in literature (see for example [9,10,18]). Practical implementations of FFR in OFDMA-based systems, such as LTE networks are discussed in papers such as [21] or [11].…”

Section: Fractional Frequency Reusementioning

confidence: 99%

“…Proof: Consider any channel assignment that satisfies constraints (1) and (9). If no channel is available for a mobile m i in the center of C p while a channel is assigned to at least one mobile m j at the border of C p , then we can keep the number of simultaneously communicating mobiles constant by assigning channel to mobile m i instead of m j .…”

Section: F |mentioning

confidence: 99%

Constructive algorithms for the partial directed weighted improper coloring problem

Hertz¹,

Montagné²,

Gagnon³

2016

JGAA

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Given a complete directed graph G with weights on the vertices and on the arcs, a θ-improper k-coloring is an assignment of at most k different colors to the vertices of G such that the weight of every vertex v is greater, by a given factor 1 θ , than the sum of the weights on the arcs (u, v) entering v with the tail u of the same color as v. For a given real number θ and an integer k, the Partial Directed Weigthed Improper Coloring Problem (PDWICP) is to determine the order of the largest induced subgraph G of G such that G admits a θ-improper k-coloring. This problem is motivated by a practical channel assignment application where the objective is to maximize the number of simultaneously communicating mobiles in a wireless network. We consider three constructive algorithms for the standard vertex coloring problem, and adapt them to the PDWICP. We show that they perform better than today's phone operator systems based on decentralized channel assignment strategies such as fractional frequency reuse.

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“…This scheme employs low spatial reuse, hence reducing the overall throughput of the network. In [7], a dynamic graph based FFR scheme is discussed where neighbouring macrocells are assigned orthogonal chunks of spectrum based on the load on each cell. This approach results in a greedy and low spatial reuse, especially when heavily loaded cells require high number of Resource Blocks (RBs).…”

Section: A Related Workmentioning

confidence: 99%

Dynamic femtocell resource allocation for managing inter‐tier interference in downlink of heterogeneous networks

et al. 2016

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This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macrocells and femtocells sharing the same frequency band. The focus is to devise optimised policies for femtocells' access to the shared spectrum, in terms of femtocell transmissions, in order to maximise femto users sum data rate while ensuring that certain level of quality of service (QoS) for the macro-cell users in the vicinity of femtocells is provided. The optimal solution to this problem is obtained by employing the well-known Dual Lagrangian method and the optimal femtocell transmit power and resource allocation solution is derived in detail. However, the optimal solution introduces high computational complexity and may not be feasible to apply in real-time systems. To this end, we propose a heuristic solution to the problem. The algorithms to implement both optimal and efficient suboptimal schemes in a practical system are also given in detail while their complexity is compared. Simulation results show that our proposed dynamic resource allocation scheme a) ensures the macro users QoS requirements compared to the Reuse-1 scheme, where femtocells are allowed to transmit at full power and bandwidth; b) can maintain femto user data rates at high levels, compared to the Orthogonal Frequency Reuse scheme, where the network bandwidth resources are partially divided amongst macro and femtocells; and c) provides performance close to the optimal solution, while introducing much lower complexity.

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A Graph Approach to Dynamic Fractional Frequency Reuse (FFR) in Multi-Cell OFDMA Networks

Cited by 168 publications

References 5 publications

Studying Optimal Design of Strict Fractional Frequency Reuse in OFDMA Cellular System

Studying Optimal Design of Strict Fractional Frequency Reuse in OFDMA Cellular System

Constructive algorithms for the partial directed weighted improper coloring problem

Dynamic femtocell resource allocation for managing inter‐tier interference in downlink of heterogeneous networks

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