Resource Allocation in Hybrid Macro/Femto Networks

Chu, Xiaoli; Wu, Yuhua; Benmesbah, Lamia; Ling, Wing‐Kuen

doi:10.1109/wcncw.2010.5487658

Cited by 41 publications

(16 citation statements)

References 11 publications

(23 reference statements)

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“…Considering that macrocells typically have a higher priority to access the available spectrum than closed-access femtocells [13], [29], as macrocells provide the infrastructural network to most mobile UEs, and under the assumption that each FAP knows its distance from the closest MBS [12], we propose the following strategy for an FAP to self-regulate its transmit power and usage of radio resource , in order to make it possible for FAPs located closer to the MBS to transmit at power levels higher than…”

Section: Decentralized Femtocell Self-regulationmentioning

confidence: 99%

On Providing Downlink Services in Collocated Spectrum-Sharing Macro and Femto Networks

Chu

Liu

et al. 2011

IEEE Trans. Wireless Commun.

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-Femtocells have been considered by the wireless industry as a cost-effective solution not only to improve indoor service providing, but also to unload traffic from already overburdened macro networks. Due to spectrum availability and network infrastructure considerations, a macro network may have to share spectrum with overlaid femtocells. In spectrum-sharing macro and femto networks, inter-cell interference caused by different transmission powers of macrocell base stations (MBS) and femtocell access points (FAP), in conjunction with potentially densely deployed femtocells, may create dead spots where reliable services cannot be guaranteed to either macro or femto users. In this paper, based on a thorough analysis of downlink (DL) outage probabilities (OP) of collocated spectrum-sharing orthogonal frequency division multiple access (OFDMA) based macro and femto networks, we devise a decentralized strategy for an FAP to self-regulate its transmission power level and usage of radio resources depending on its distance from the closest MBS. Simulation results show that the derived closedform lower bounds of DL OPs are tight, and the proposed decentralized femtocell self-regulation strategy is able to guarantee reliable DL services in targeted macro and femto service areas while providing superior spatial reuse, for even a large number of spectrum-sharing femtocells deployed per cell site.

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Section: Decentralized Femtocell Self-regulationmentioning

confidence: 99%

On Providing Downlink Services in Collocated Spectrum-Sharing Macro and Femto Networks

Chu

Liu

et al. 2011

IEEE Trans. Wireless Commun.

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“…This induces a new set of cross-tier interference. Hybrid access deals with both problem by adjusting resources according to the number of femtocell owners and subscribers [3,4]. However, for different density of users and femtocell locations, most of the algorithms are outperformed in practical implementation.…”

Section: Introductionmentioning

confidence: 99%

Cognitive closed access femtocell application using multi-element antenna

Islam

Ahmed

Singh

et al. 2015

J Wireless Com Network

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In this paper, a cognitive closed access multi-element antenna-specific femtocell protocol is presented. Femtocell is considered as the preeminent solution for indoor coverage in long-term evaluation (LTE) and LTE-advanced networks. The protocol is verified using a patch antenna for LTE network. In a vast deployment of this mini base station, unwanted handover event is considered as the major obstacle. Access control mechanism with coverage-optimized antenna pattern is one of the most promising solution to resolve this obstacle. A previously proposed microstrip four-element femtocell configuration is used to analyze the performance in user categorizing technique for closed access femtocell network. The categorization is performed using multi-layer feed forward network in neural network.The performance of the technique shows an inherent relationship between completeness of training data and error percentage. Sufficiently low error rates can be achieved by presenting about 15 training samples.

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“…Frequency reuse schemes based on geographic position were proposed in [7] - [10] to mitigate intra-tier interference. In addition, cross-tier and intra-tier interference were both considered in [11] - [13], where LPNs chose sub-channels based on the detected channel information. However, the decision is conducted only with the local information, which may degrade the global performance.…”

Section: Introductionmentioning

confidence: 99%

A practical channel allocation scheme based on the weighted conflict graph in heterogeneous networks

Zhang

Zhou

Niu

et al. 2014

2014 IEEE/CIC International Conference on Communications in China (ICCC)

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Heterogeneous Networks (HetNets), where Low Power Nodes (LPN) are deployed under the coverage of Macro Base Stations (MBS), are promising to boost the spectrum efficiency per unit area. However, this hierarchical architecture also brings new problems, like severe inter-cell interference.The randomly deployed LPNs, and the co-existence of the cross-tier and intra-tier interference make it challenging to design the effective frequency reuse schemes, which can have significant influences on the user experience and the network capacity. In this paper, we explore the frequency reuse problem in HetNets for interference mitigation. Firstly, Partial Spectrum Reuse (PSR) scheme is adopted to mitigate the cross-tier interference, where MBSs can use all available spectrums while LPNs can only use part of the channels based on their traffic load. Then, the channel allocation scheme is further optimized to mitigate the intra-tier interference. As the channel allocation problem is NP-hard, we propose a greedy channel allocation scheme based on a weighted conflict graph, where cross-tier and intra-tier interference are both considered. In addition, our method is practical for channel allocation in real systems. Simulation results show the SINR of cell edge users and the ergodic SINR can be both improved by 3dB as much with our greedy method compared with the random channel allocation scheme.

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Resource Allocation in Hybrid Macro/Femto Networks

Cited by 41 publications

References 11 publications

On Providing Downlink Services in Collocated Spectrum-Sharing Macro and Femto Networks

On Providing Downlink Services in Collocated Spectrum-Sharing Macro and Femto Networks

Cognitive closed access femtocell application using multi-element antenna

A practical channel allocation scheme based on the weighted conflict graph in heterogeneous networks

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