A Graph-Based Approach to Multi-Cell OFDMA Downlink Resource Allocation

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

doi:10.1109/glocom.2008.ecp.713

Cited by 60 publications

(36 citation statements)

References 10 publications

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“…In this paper, we apply the graph coloring algorithm [11] [12] to categorize the picocells into orthogonal groups, in which each color represents a group. Then the partition problem turns into a graph coloring method of allocating colors to the vertex set V appropriately to ensure no two vertices with an edge have the same color.…”

Section: ) Partitioning Picocells Into Groupsmentioning

confidence: 99%

A Novel Dynamic Interference Coordination Scheme in Macrocell-Picocell Heterogeneous Networks

Zeng

Chen

Zhang

et al. 2013

2013 IEEE 77th Vehicular Technology Conference (VTC Spring)

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Picocell is an emerging and key item in LTE-Advanced system, for providing improved service coverage and high spectral efficiency with low power. However, in heterogeneous networks (Het-Nets) with macrocells and picocells, more complicated interference scenario can severely degrade the system performance, especially for system capacity and data rate of cell-edge users. Consequently, effective interference coordination schemes are in great demand to mitigate these interference problems. In this paper, we propose a new effective dynamic interference coordination scheme based on an innovative combination of soft frequency reuse (SFR) and improved Graph-based resource allocation in orthogonal frequency-division multiplexing access (OFDMA) macrocell-picocell network. The system-level simulation results show that the proposed scheme can achieve superior system performance improvements, higher cell-edge user data rate and more efficient frequency reuse, comparing with the time domain interference coordination Almost Blank Subframes (ABS) scheme and the conventional co-channel resource allocation scheme.

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Section: ) Partitioning Picocells Into Groupsmentioning

confidence: 99%

A Novel Dynamic Interference Coordination Scheme in Macrocell-Picocell Heterogeneous Networks

Zeng

Chen

Zhang

et al. 2013

2013 IEEE 77th Vehicular Technology Conference (VTC Spring)

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“…In [8], graph approach had also been used to study the similar problems, but it only focused on avoiding inter-cell interference and neglected the traffic demands. Some other works consider the traffic demands in other forms, but each node in their graph just represents a single mobile station (MS) rather than a cell [9]. That would lead to a large-scale graph and make the problem more complex.…”

Section: Introductionmentioning

confidence: 98%

Graph-based dynamic frequency reuse in Cloud-RAN

Wang

Zhao

Zhou

2014

2014 IEEE Wireless Communications and Networking Conference (WCNC)

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This work aims to apply a new dynamic frequency reuse scheme based on fractional frequency reuse (FFR) in Cloud-RAN structure. FFR is one of the most efficient schemes to mitigate the inter-cell interference in OFDM system, while strict FFR in traditional cellular system is still facing some problems such as the inefficient use of spectrum. Cloud-RAN is a new network structure comprised of baseband units (BBU) and remote radio heads (RRH), which has the ability to reduce the energy costs of network. We use a graph coloring method to allocate spectrum resource among different cell zones depending on different traffic demands as well as avoiding the inter-cell interference. With the application of our proposed scheme based on Cloud-RAN structure, we can not only improve the spectrum utilization, but also reduce the energy consumption through reducing the working number of BBUs. The simulation results show clearly that our new scheme in Cloud-RAN structure can achieve higher throughput and energy efficiency compared with the strict FFR in traditional cellular system.

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“…In this context, several approaches and algorithms have been investigated with various study foci, with different levels of complexity, and on different timescales. Such algorithm studies include beamforming with interference graphs between mobile terminals [41], centrally controlled dynamic channel allocation [44], decentralized algorithms applied for wireless local area networks (WLANs) [24], distributed algorithms using approaches from game theory [26], as well as distributed twostep algorithms [23].…”

Section: Introductionmentioning

confidence: 99%

ICIC in DL and UL with network distributed and self-organized resource assignment algorithms in LTE

et al. 2010

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Orthogonal Frequency Division Multiplexing (OFDM), a group of sub-tones mostly interferes with the same group of sub-tones in a neighbor cell even if the systems are not time-synchronized. Thus in OFDM or Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, interference can now be predicted and avoided with fine granularity on the basis of frequency [1]. In contrast to a reuse 1 system in which all cells use all frequency resources without any restrictions, inter-cell interference coordination (ICIC) makes use of the frequency dimension.

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A Graph-Based Approach to Multi-Cell OFDMA Downlink Resource Allocation

Cited by 60 publications

References 10 publications

A Novel Dynamic Interference Coordination Scheme in Macrocell-Picocell Heterogeneous Networks

A Novel Dynamic Interference Coordination Scheme in Macrocell-Picocell Heterogeneous Networks

Graph-based dynamic frequency reuse in Cloud-RAN

ICIC in DL and UL with network distributed and self-organized resource assignment algorithms in LTE

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