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Traffic Allocation for Low-Latency Multi-Hop Networks With Buffers
KTH, School of Electrical Engineering and Computer Science (EECS), Information Science and Engineering.ORCID iD: 0000-0003-0134-2996
Univ Notre Dame, Dept Elect Engn, Notre Dame, IN 46556 USA..
KTH, School of Electrical Engineering and Computer Science (EECS), Information Science and Engineering.ORCID iD: 0000-0002-5407-0835
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. Vol. 66, no 9, p. 3999-4013
Keywords [en]
Traffic allocation, end-to-end latency, multi-hop networks, queuing, millimeter-wave communication
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-235893DOI: 10.1109/TCOMM.2018.2832203ISI: 000444805800023Scopus ID: 2-s2.0-85046338211OAI: oai:DiVA.org:kth-235893DiVA, id: diva2:1255162
Note

QC 20181011

Available from: 2018-10-11 Created: 2018-10-11 Last updated: 2018-11-06Bibliographically approved

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Yang, GuangXiao, Ming

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