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Publications (9 of 9) Show all publications
Yang, G., Xiao, M., Al-Zubaidy, H., Huang, Y. & Gross, J. (2018). Analysis of Millimeter-Wave Multi-Hop Networks With Full-Duplex Buffered Relays. IEEE/ACM Transactions on Networking, 26(1), 576-590
Open this publication in new window or tab >>Analysis of Millimeter-Wave Multi-Hop Networks With Full-Duplex Buffered Relays
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2018 (English)In: IEEE/ACM Transactions on Networking, ISSN 1063-6692, E-ISSN 1558-2566, Vol. 26, no 1, p. 576-590Article in journal (Refereed) Published
Abstract [en]

The abundance of spectrum in the millimeter-wave (mm-wave) bands makes it an attractive alternative for future wireless communication systems. Such systems are expected to provide data transmission rates in the order of multi-gigabits per second in order to satisfy the ever-increasing demand for high rate data communication. Unfortunately, mm-wave radio is subject to severe path loss, which limits its usability for long-range outdoor communication. In this paper, we propose a multi-hop mm-wave wireless network for outdoor communication, where multiple full-duplex buffered relays are used to extend the communication range, while providing end-to-end performance guarantees to the traffic traversing the network. We provide a cumulative service process characterization for the mm-wave propagation channel with self-interference in terms of the moment generating function of its channel capacity. Then, we then use this characterization to compute probabilistic upper bounds on the overall network performance, i.e., total backlog and end-to-end delay. Furthermore, we study the effect of self-interference on the network performance and propose an optimal power allocation scheme to mitigate its impact in order to enhance network performance. Finally, we investigate the relation between relay density and network performance under a sum power constraint. We show that increasing relay density may have adverse effects on network performance, unless the selfinterference can be kept sufficiently small.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2018
Keywords
Millimeter-wave, multi-hop, moment generating functions, delay, backlog
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-224045 (URN)10.1109/TNET.2017.2786341 (DOI)000425324000042 ()2-s2.0-85041182670 (Scopus ID)
Note

QC 20180320

Available from: 2018-03-20 Created: 2018-03-20 Last updated: 2018-04-16Bibliographically approved
Yang, G., Xiao, M. & Pang, Z. (2018). Delay Analysis of Traffic Dispersion with Nakagami-m Fading in Millimeter-Wave Bands. In: 2018 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC): . Paper presented at IEEE Wireless Communications and Networking Conference (WCNC), APR 15-18, 2018, Barcelona, SPAIN. IEEE
Open this publication in new window or tab >>Delay Analysis of Traffic Dispersion with Nakagami-m Fading in Millimeter-Wave Bands
2018 (English)In: 2018 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC), IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

We analyze the delay performance of traffic dispersion in millimeter-wave (mm-wave) communications, where Nakagami-m fading channel is considered. To apply (mm, +)algebra network calculus in wireless communications, we develop a closed-form expression based on moment generating function (MGF), which characterizes the stochastic service process by staying in the bit domain, rather than transferring to the SNR domain. Subsequently, for traffic dispersion with mm-wave, we derive probabilistic delay bounds and effective capacity based on the obtained MGF of the cumulative service process. Besides, the impacts of several factors, e.g., the number of independent path, system gain (including antenna gain and adopted radio frequency) or Nakagami parameter, on the delay performance are studied. We not only comprehensively study the delay performance of traffic dispersion with mm-wave, but also demonstrate the feasibility and tractability of performance analysis.

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE Wireless Communications and Networking Conference, ISSN 1525-3511
Keywords
Millimeter-wave, Nakagami-m fading, traffic dispersion, probabilistic delay, effective capacity
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-232295 (URN)10.1109/WCNC.2018.8377219 (DOI)000435542401107 ()2-s2.0-85049199769 (Scopus ID)978-1-5386-1734-2 (ISBN)
Conference
IEEE Wireless Communications and Networking Conference (WCNC), APR 15-18, 2018, Barcelona, SPAIN
Note

QC 20180719

Available from: 2018-07-19 Created: 2018-07-19 Last updated: 2019-03-27Bibliographically approved
Zhang, Z., Yang, G., Ma, Z., Xiao, M., Ding, Z. & Fan, P. (2018). Heterogeneous Ultradense Networks with NOMA System Architecture, Coordination Framework, and Performance Evaluation. IEEE Vehicular Technology Magazine, 13(2), 110-120
Open this publication in new window or tab >>Heterogeneous Ultradense Networks with NOMA System Architecture, Coordination Framework, and Performance Evaluation
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2018 (English)In: IEEE Vehicular Technology Magazine, ISSN 1556-6072, E-ISSN 1556-6080, Vol. 13, no 2, p. 110-120Article in journal (Refereed) Published
Abstract [en]

Heterogeneous ultradense networks (H-UDNs) are one key enabler for fifth-generation (5G) wireless networks and beyond to satisfy the explosive growth of mobile data traffic, which exploits spatial reuse of scarce spectrum by deploying massive base stations (BSS) to boost network capacity and enhance network coverage. In this article, we present the system architecture for 5G H-UDNs, consisting of virtualized integrated ground-Air-space radio access networks (RANs) and core networks and study network coordination for virtualized H-UDN to efficiently manage computing resources and intercell interference. We look at a cloud-fog-computing coordination framework for efficient computing resource management by achieving reasonable computing task distribution and transfer; computing load balance for computing tasks among virtual computing resources to improve network performance and computing resource efficiency; and a macro-small cell coordination framework for virtualized H-UDN with nonorthogonal multiple access (NOMA) to efficiently manage intercell interference and improve network performance. The joint macro-small enhanced intercell interference coordination (eICIC) and small-small coordinated multipoint joint transmission (CoMP-JT) scheme can efficiently eliminate macro-small intercell interference and utilize small-small intercell interference.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-230478 (URN)10.1109/MVT.2018.2812280 (DOI)000433094600016 ()2-s2.0-85046375092 (Scopus ID)
Note

QC 20180613

Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-06-19Bibliographically approved
Yang, G., Xiao, M., Alam, M. & Huang, Y. (2018). Low-Latency Heterogeneous Networks with Millimeter-Wave Communications. IEEE Communications Magazine, 56(6), 124-129
Open this publication in new window or tab >>Low-Latency Heterogeneous Networks with Millimeter-Wave Communications
2018 (English)In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 56, no 6, p. 124-129Article in journal (Refereed) Published
Abstract [en]

The heterogeneous network (HetNet) is a key enabler to largely boost network coverage and capacity in the forthcoming 5G and beyond. To support the explosively growing mobile data volumes, wireless communications with millimeter- wave (mmWave) radios have attracted massive attention, and is widely considered as a promising candidate in 5G HetNets. In this article, we give an overview on the end-to-end latency of HetNets with mmWave communications. In general, it is rather challenging to formulate and optimize the delay problem with buffers in mmWave communications, since conventional graph-based network optimization techniques are not applicable when queues are considered. Toward this end, we develop an adaptive low-latency strategy, which uses cooperative networking to reduce the end-to-end latency. Then we evaluate the performance of the introduced strategy. Results reveal the importance of proper cooperative networking in reducing the end-toend latency. In addition, we have identified several challenges in future research for low-latency mmWave HetNets.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-238214 (URN)10.1109/MCOM.2018.1700874 (DOI)000435556100019 ()2-s2.0-85048767392 (Scopus ID)
Note

QC 20181120

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2018-11-20Bibliographically approved
Yang, G. (2018). Throughput and Latency of Millimeter-Wave Networks: Performance Analyses and Design Principles. (Doctoral dissertation). Stockholm: KTH Royal Institute of Technology
Open this publication in new window or tab >>Throughput and Latency of Millimeter-Wave Networks: Performance Analyses and Design Principles
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nowadays, the ever-increasing demands on higher data rates and better serviceperformance have posed extremely huge challenges to the existing wireless communicationswithin sub-6 GHz bands, mainly due to the spectrum scarcity in lowerfrequency bands. In recent years, the millimeter-wave (mm-wave) technology, as apromising candidate to meet the aforementioned demands, have attracted extensiveresearch attention, and has been regarded as one of the key enablers for theforthcoming the 5th generation (5G) mobile communications. The main featuresof mm-wave communications include: abundant spectral resources, high penetrationloss, severe path loss, weak multi-path effects, and narrow antenna beams, andthese particular features make the potential challenges and solutions with mm-wavediffer a lot from those in the conventional 6-GHz systems.

It is known that the high throughput and the low latency are two critical qualityof-service (QoS) aspects in future mobile networks, while the related research withmm-wave are fairly recent and insufficient in the past few years. Motived by theurgent needs for further development and the blanks remained in previous works,in this doctoral thesis, we investigate the throughput and the latency in mm-wavenetworks through conducting performance analyses and identifying design principles,with the objective of seeking clues for improving the QoS of mm-wave wirelesscommunications in practice.

Our main research regarding throughput and latency in mm-wave networksthat are included in this doctoral thesis can be categorized from the following threeaspects:

(i) Throughput of mm-wave relay networks: For indoor scenarios, we study thehalf-duplex (HD) relaying with mm-wave in the presence of random linkblockages, where a distance-based routing algorithm is proposed to maximizethe throughput. For outdoor scenarios, focusing on a two-hop amplifyand-forward (AF) relay network in the HD or the full-duplex (FD) mode, weinvestigate the impacts of beamwidth, ground reflections, and self-interferencecoefficient on the throughput, where Gaussian-type directional antenna modeland two-ray channel model are jointly adopted.

(ii) Latency analysis via stochastic network calculus: With the aid of stochasticnetwork calculus, we derive upper bounds for the probabilistic delay tokeep track of the latency performance of buffer-aided mm-wave networks. We mainly study mm-wave systems designed in tandem or parallel manners,and also consider a hybrid design that combines the tandem and parallelschemes in a flexible manner. Moreover, the capability of achieving low-latencymm-wave communications is characterized and investigated in terms of effectivecapacity, and the comparison among different transmission schemes isconducted to identify the respective strengths and proper conditions for theirapplications.

(iii) Traffic allocation for low-latency mm-wave systems: Traffic allocation schemesfor low latency in buffer-aided mm-wave networks are investigated. Due tothe use of buffers, the delay optimization problem hereby differs from thosewithout buffers, where the conventional graph-based network optimizationtechniques become intractable. We demonstrate the impacts of different trafficallocation schemes on the latency. For multi-hop networks with multipleparallel channels in each hop, we consider both local and global traffic allocationschemes, quantify their resulting end-to-end (E2E) latencies, and analyzethe respective strengths and weaknesses.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 250
Series
TRITA-EECS-AVL ; 2018:28
National Category
Telecommunications
Research subject
Telecommunication
Identifiers
urn:nbn:se:kth:diva-225654 (URN)978-91-7729-731-4 (ISBN)
Public defence
2018-05-03, Kollegiesalen, Brinellvägen 8, Stockholm, 09:30 (English)
Opponent
Supervisors
Note

QC 20180410

Available from: 2018-04-10 Created: 2018-04-06 Last updated: 2018-04-10Bibliographically approved
Yang, G., Haenggi, M. & Xiao, M. (2018). Traffic Allocation for Low-Latency Multi-Hop Networks With Buffers. IEEE Transactions on Communications, 66(9), 3999-4013
Open this publication in new window or tab >>Traffic Allocation for Low-Latency Multi-Hop Networks With Buffers
2018 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 66, no 9, p. 3999-4013Article in journal (Refereed) Published
Abstract [en]

For buffer-aided tandem networks consisting of relay nodes and multiple channels per hop, we consider two traffic allocation schemes, namely local allocation and global allocation, and investigate the end-to-end latency of a file transfer. We formulate the problem for generic multi-hop queuing systems and subsequently derive closed-form expressions of the end-to-end latency. We quantify the advantages of the global allocation scheme relative to its local allocation counterpart, and we conduct an asymptotic analysis on the performance gain when the number of channels in each hops increases to infinity. The traffic allocations and the analytical delay performance are validated through simulations. Furthermore, taking a specific two-hop network with millimeter-wave (mm-wave) as an example, we derive lower bounds on the average end-to-end latency, where Nakagami-m fading is considered. Numerical results demonstrate that, compared with the local allocation scheme, the advantage of global allocation grows as the number of relay nodes increases, at the expense of higher complexity that linearly increases with the number of relay nodes. It is also demonstrated that a proper deployment of relay nodes in a linear mm-wave network plays an important role in reducing the average end-to-end latency, and the average latency decays as the mm-wave channels become more deterministic. These findings provide insights for designing multi-hop mm-wave networks with low end-to-end latency.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Keywords
Traffic allocation, end-to-end latency, multi-hop networks, queuing, millimeter-wave communication
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-235893 (URN)10.1109/TCOMM.2018.2832203 (DOI)000444805800023 ()2-s2.0-85046338211 (Scopus ID)
Note

QC 20181011

Available from: 2018-10-11 Created: 2018-10-11 Last updated: 2018-11-06Bibliographically approved
Yang, G. & Xiao, M. (2017). Blockage robust millimeter-wave networks. Science China Information Sciences, 60(8), Article ID 080307.
Open this publication in new window or tab >>Blockage robust millimeter-wave networks
2017 (English)In: Science China Information Sciences, ISSN 1674-733X, E-ISSN 1869-1919, Vol. 60, no 8, article id 080307Article in journal, Editorial material (Refereed) Published
Place, publisher, year, edition, pages
Science in China Press, 2017
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-243526 (URN)10.1007/s11432-017-9147-0 (DOI)000404519100011 ()2-s2.0-85021688878 (Scopus ID)
Note

QC 20190208

Available from: 2019-02-08 Created: 2019-02-08 Last updated: 2019-08-20Bibliographically approved
Li, B., Månsson, D. & Yang, G. (2015). An Efficient Method for Solving Frequency Responses of Power-Line Networks. Progress in Electromagnetics Research B, 62(1), 303-317
Open this publication in new window or tab >>An Efficient Method for Solving Frequency Responses of Power-Line Networks
2015 (English)In: Progress in Electromagnetics Research B, ISSN 1937-6472, E-ISSN 1937-6472, Vol. 62, no 1, p. 303-317Article in journal (Refereed) Published
Abstract [en]

This paper presents a novel approach for solving the frequency responses of a powerline network, which is a two-parallel-conductor system with multiple junctions and branches. By correcting the reflection coefficient and transmission coefficient of each junction, a complex network can be decomposed into several, single-junction, units. Based on the Baum-Liu-Tesche (BLT) equation, we preliminarily propose the calculation method of frequency responses for single-junction network. In accordance with the direction of power transfer, we calculate the frequency responses of loads connected to each junction sequentially, from the perspective of the network structure. This approach greatly simplifies the computational complexity of the network frequency responses. To verify the proposed algorithm, networks with various numbers of junctions and branches are investigated, and the results are compared with a commercial electromagnetic simulator based on the topology. The analytical results agree well with the simulated ones.

Place, publisher, year, edition, pages
EMW Publishing, 2015
Keywords
Frequency response, Analytical results, Commercial electromagnetic simulator, Network structures, Parallel conductors, Power transfers, Powerline networks, Single junction, Transmission coefficients
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-166287 (URN)10.2528/PIERB15013008 (DOI)2-s2.0-84930659464 (Scopus ID)
Funder
StandUp
Note

QC 20150511

Available from: 2015-05-07 Created: 2015-05-07 Last updated: 2018-02-26Bibliographically approved
Yang, G., Du, J. & Xiao, M. (2015). Maximum Throughput Path Selection with Random Blockage for Indoor 60 GHz Relay Networks. IEEE Transactions on Communications, 63(10), 3511-3524
Open this publication in new window or tab >>Maximum Throughput Path Selection with Random Blockage for Indoor 60 GHz Relay Networks
2015 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 63, no 10, p. 3511-3524Article in journal (Refereed) Published
Abstract [en]

Indoor communications in the 60 GHz band is capable to support multi-gigabit wireless access thanks to the abundant spectrum and the possibility of using dense antenna arrays. However, the high directivity and penetration loss make it vulnerable to blockage events which can be frequent in indoor environments. Given network topology information in sufficient precision, we investigate the average throughput and outage probability when the connection between any two nodes can be established either via the line-of-sight (LOS) link, through a reflection link, or by a half-duplex relay node. We model the reflection link as an LOS with extra power loss and derive the closed-form expression for the relative reflection loss. For networks with a central coordinator and multiple relays, we also propose a generic algorithm, maximum throughput path selection (MTPS), to select the optimal path that maximizes the throughput. The complexity of the MTPS algorithm is O(n2) for networks equipped with n relays, whereas a brute-forced algorithm has complexity of O(n · n!). Numerical results show that increasing the number of relays can significantly increase the average throughput and decrease the outage probability, and resorting to reflection paths provides significant gains when the probability of link blockage is high.

Place, publisher, year, edition, pages
IEEE Press, 2015
Keywords
60 GHz, Relay, Blockage, Throughput, Outage, Reflection
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-159104 (URN)10.1109/TCOMM.2015.2463284 (DOI)000363257200006 ()2-s2.0-84958019491 (Scopus ID)
Funder
Swedish Research Council, 637-2013-473
Note

QC 20151117. Updated from Manuscript to Article in journal.

Available from: 2015-01-21 Created: 2015-01-21 Last updated: 2019-10-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0134-2996

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