Downlink Spectrum Sharing for Cognitive Radio Femtocell Networks

Xiang, Jie; Zhang, Yan; Skeie, Tor; Xie, Lin

doi:10.1109/jsyst.2010.2083230

Cited by 106 publications

(62 citation statements)

References 24 publications

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“…As can be seen throughout this section, we enable CR technology [28] on femto-BSs as a solution for coexistence to tackle the above challenges. A CR-enabled femto-BS could automatically sense environment, interpret received signaling from macro-BS and surrounding femto-BSs, and intelligently allocate resource [12], [19], [20], [22]- [24], [33]- [37]. Consequently, macro-BS and CR-enabled femto-BS are respectively analogous to PUs and SUs in the CR model.…”

Section: Features Of Small Cellsmentioning

confidence: 99%

“…By utilizing RBs with acceptable channel quality, the impact of frequency selected fading can be alleviated. Similarly, as all cells only utilize unoccupied RBs by neighboring cells, interference can also be rejected [5], [8], [14], [18], [20], [24], [43]- [45]. Following this concept, a particular solution known as the almost blank subframe (ABS) solution is proposed in Enhanced Inter-cell Interference Coordination (eICIC) in 3GPP LTE-Advanced [3].…”

Section: Time-frequencymentioning

confidence: 99%

“…By performing periodical channel measurement in UEs and reporting the measurement results to its serving BS [14], [20], [46], the serving BS can analyze and acquire the activity and the channel condition about immediate environment of the radio resource usages in neighboring cells, which facilitates the interference mitigation. However, performing measurement quite consumes power in UEs.…”

Section: Measuring At the Ue Sidementioning

confidence: 99%

“…By exploiting such capability, the detection of surrounding cell signals can be achieved without any coordinations [12], [19], [20], [22]- [24], [33]- [37], [48]. For example, if the received interference power on a RB exceeds a certain threshold, femto-BS identifies that this RB is occupied and retrieves activity [23].…”

Section: Measuring At the Bs Sidementioning

confidence: 99%

“…In this case, distributed schemes are of much importance, and researchers have provided a number of distributed schemes for interference management in small cells, in those, some key techniques are discussed. The spectrum sharing problem in the HetNet is formulated as optimization problem to maximize the downlink capacity of all small cells while guaranteeing the SINR constraints [20]. By applying dual decomposition [74], the problem can be efficiently resolved in a distributed fashion.…”

Section: Distributed Optimizationmentioning

confidence: 99%

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Interference Mitigation in CR-Enabled Heterogeneous Networks

Lien

Cheng

Chen

2013

IEICE Trans. Commun.

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SUMMARYThe heterogeneous network (HetNet), which deploys small cells such as picocells, femotcells, and relay nodes within macrocell, is regarded as a cost-efficient and energy-efficient approach to resolve increasing demand for data bandwidth and thus has received a lot of attention from research and industry. Since small cells share the same licensed spectrum with macrocells, concurrent transmission induces severe interference, which causes performance degradation, particularly when coordination among small cell base stations (BSs) is infeasible. Given the dense, massive, and unplanned deployment of small cells, mitigating interference in a distributed manner is a challenge and has been explored in recent papers. An efficient and innovative approach is to apply cognitive radio (CR) into HetNet, which enables small cells to sense and to adapt to their surrounding environments. Consequently, stations in each small cell are able to acquire additional information from surrounding environments and opportunistically operate in the spectrum hole, constrained by minimal inducing interference. This paper summarizes and highlights the CR-based interference mitigation approaches in orthogonal frequency division multiple access (OFDMA)-based HetNet networks. With special discussing the role of sensed information at small cells for the interference mitigation, this paper presents the potential cross-layer facilitation of the CR-enable HetNet. key words: heterogeneous networks (HetNet), small cell, interference management, interference mitigation, cognitive radio

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Section: Features Of Small Cellsmentioning

confidence: 99%

Section: Time-frequencymentioning

confidence: 99%

Section: Measuring At the Ue Sidementioning

confidence: 99%

Section: Measuring At the Bs Sidementioning

confidence: 99%

Section: Distributed Optimizationmentioning

confidence: 99%

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Interference Mitigation in CR-Enabled Heterogeneous Networks

Lien

Cheng

Chen

2013

IEICE Trans. Commun.

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Cognitive Radios to Mitigate Interference in Macro/femto Heterogeneous Networks

Cheng

Chen

2013

Heterogeneous Cellular Networks

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A DOF‐based dynamic spectrum auction algorithm in cognitive femtocell

Ren

et al. 2012

Concurrency and Computation

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SUMMARYDynamic spectrum auction (DSA) has been considered as one of potential spectrum allocation approaches in cognitive femtocell networks. As a modified version of traditional spectrum auction, DSA should not only increase auction revenue but also improve spectrum utilization on finer time granularity. We propose a DSA algorithm based on a double optimization framework (DOF), which focuses on the optimization of auction revenue and spectrum utilization. The optimization processing consists of two stages. Firstly, a proper auction period is selected to balance the expected spectrum utilization and auction revenue. Then, the cognitive femtocell base station adjusts its reserve price with the repetition of auction to leverage over instant revenue and spectrum utilization. At the same time, the bidders can adjust their bidding price to improve utilities. Performance analysis shows that the DOF‐based DSA algorithm has low complexity and can resist collusion, so it can be carried out frequently with small overhead. On the other hand, it is better than the greedy algorithm and Vickrey–Clarke–Groves auction on revenue. Simulation results show that the DOF‐based DSA algorithm can keep a fine spectrum utilization and bring the cognitive femtocell base station more revenue in both single‐unit award spectrum auction and multi‐unit awards spectrum auction. Copyright © 2012 John Wiley & Sons, Ltd.

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Downlink Spectrum Sharing for Cognitive Radio Femtocell Networks

Cited by 106 publications

References 24 publications

Interference Mitigation in CR-Enabled Heterogeneous Networks

Interference Mitigation in CR-Enabled Heterogeneous Networks

Cognitive Radios to Mitigate Interference in Macro/femto Heterogeneous Networks

A DOF‐based dynamic spectrum auction algorithm in cognitive femtocell

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