Random access in millimeter-wave beamforming cellular networks: issues and approaches

Jeong, Cheol; Park, Jeong-Ho; Yu, Hyun-Kyu

doi:10.1109/mcom.2015.7010532

Cited by 161 publications

(106 citation statements)

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“…Also, in [7], a lowcomplexity multistage codebook is designed to support the IEEE 802.15.3c protocol. In [9], an exhaustive beam search method is proposed. Two beamforming schemes, namely, random-phase beamforming and directional beamforming, have been tested in [10] under the line-of-sight (LOS) channel conditions.…”

Section: Literature Reviewmentioning

confidence: 99%

“…For this reason, codebook-based beamforming has been recently proposed 2 Wireless Communications and Mobile Computing as an efficient method to reduce the dependency on CSI estimation/feedback [6,7]. Also, several works have been presented on both physical layer and procedural algorithms of IA beamforming [8][9][10][11][12][13][14][15]. However, in these works either the algorithms are designed for special metrics, precoding/combining schemes, and channel models or the implementation complexity grows significantly by an increasing number of BSs/users.…”

Section: Introductionmentioning

confidence: 99%

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Genetic Algorithm‐Based Beam Refinement for Initial Access in Millimeter Wave Mobile Networks

Guo

Makki

Svensson

2018

Wireless Communications and Mobile Computing

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Initial access (IA) is identified as a key challenge for the upcoming 5G mobile communication system operating at high carrier frequencies, and several techniques are currently being proposed. In this paper, we extend our previously proposed efficient genetic algorithm-(GA-) based beam refinement scheme to include beamforming at both the transmitter and the receiver and compare the performance with alternative approaches in the millimeter wave multiuser multiple-input-multiple-output (MU-MIMO) networks. Taking the millimeter wave communications characteristics and various metrics into account, we investigate the effect of different parameters such as the number of transmit antennas/users/per-user receive antennas, beamforming resolutions, and hardware impairments on the system performance employing different beam refinement algorithms. As shown, our proposed GA-based approach performs well in delay-constrained networks with multiantenna users. Compared to the considered state-of-the-art schemes, our method reaches the highest service outage-constrained end-to-end throughput with considerably less implementation complexity. Moreover, taking the users' mobility into account, our GA-based approach can remarkably reduce the beam refinement delay at low/moderate speeds when the spatial correlation is taken into account. Finally, we compare the cases of collaborative users and noncollaborative users and evaluate their difference in system performance.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm‐Based Beam Refinement for Initial Access in Millimeter Wave Mobile Networks

Guo

Makki

Svensson

2018

Wireless Communications and Mobile Computing

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“…In order for the next generation cellular networks to meet these demands, three scenarios are proposed: more frequency re-usability, enhanced spectral efficiency, and higher frequency bandwidth [2], [3]. With the relatively wide spectrum and the cost effective CMOS technology, mmWave is anticipated to be the core of the future wireless networks [4].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Beamformers Design for MIMO Relay Networks in Millimeter Wave

Abbas

Hamdi

2017

2017 IEEE Wireless Communications and Networking Conference (WCNC)

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Abstract-One of the challenges for the wireless networks is meeting the high demand for cellular data. One approach is to utilize the wide bandwidth provided by the millimeter wave (mmWave) frequencies. In this work, we propose using multiple relays to link two points in the outdoor mmWave environments. We use hybrid (analog and digital) beamformers in the Amplify-and-Forward (AF) half duplex relays to overcome the propagation losses usually arise in such environments. The design is based on the the widely known Orthogonal Match Pursuit (OMP) algorithm. Results show significant performance improvement for multiple relay links as compared to links with single relay. The results also discuss the influence of the array size and the number of RF chains on the overall performance.

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“…Therefore, the initial access procedure needs to be designed properly to exploit the resources in the spatial dimension. More specifically, to detect/discover a BS in the proximity of a UE, both the mm-wave transmitter and receiver need to align their transmission and reception beams with each other [8].…”

Section: Introductionmentioning

confidence: 99%

“…In section IV, numerical results are presented to illustrate the performance improvement and the final section concludes the paper. Fig.1 illustrates the IA procedure between a single UE and a single mmSC in existing mm-wave technologies [8]- [9]. We assume pre-defined beam codebooks for simplicity.…”

Section: Introductionmentioning

confidence: 99%

Coordinated initial access in millimetre wave standalone networks

Nekovee

2016

2016 IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS)

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Abstract-In this paper, a novel coordinated initial access (IA) scheme for clustered millimeter wave small cells (mmSCs) is proposed for the fifth generation mobile communication networks (5G). This solution is a method for efficient and fast initial access for ultra-dense millimeter wave standalone networks without presence of overlaid legacy networks operating on lower frequency. In contrast to the current full beam sweep scheme, where time consuming exhaustive searching is employed, the mmSCs within one cluster will perform the IA procedure in a coordinated manner based on the power delay profile (PDP) measurement reports shared with each other via the backhaul links and thereby avoiding the full beam sweep. The proposed scheme significantly reduces the initial access time, enhances the access robustness and reduces the cost and complexity of the mobile terminals.

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Random access in millimeter-wave beamforming cellular networks: issues and approaches

Cited by 161 publications

References 10 publications

Genetic Algorithm‐Based Beam Refinement for Initial Access in Millimeter Wave Mobile Networks

Genetic Algorithm‐Based Beam Refinement for Initial Access in Millimeter Wave Mobile Networks

Hybrid Beamformers Design for MIMO Relay Networks in Millimeter Wave

Coordinated initial access in millimetre wave standalone networks

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