Heterogeneous Cellular Networks With Spatio-Temporal Traffic: Delay Analysis and Scheduling
- 24 March 2017
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal on Selected Areas in Communications
- Vol. 35 (6), 1373-1386
- https://doi.org/10.1109/jsac.2017.2687379
Abstract
Emergence of new types of services has led to various traffic and diverse delay requirements in fifth-generation (5G) wireless networks. Meeting diverse delay requirements is one of the most critical goals for the design of 5G wireless networks. Though the delay of point-to-point communications has been well investigated, the delay of multi-point to multi-point communications has not been thoroughly studied, since it is a complicated function of all links in the network. In this paper, we propose a novel tractable approach to analyze the delay in the heterogeneous cellular networks with spatio-temporal random arrival of traffic. Specifically, we propose the notion of delay outage and evaluate the effect of different scheduling policies on the delay performance. Our numerical analysis reveals that offloading policy based on the cell range expansion greatly reduces the macrocell traffic, while bringing a small amount of growth for the picocell traffic. Our results also show that the delay performance of round-robin scheduling outperforms first-in first-out scheduling for heavy traffic, and it is reversed for light traffic. In summary, this analytical framework provides an understanding and a rule-of-thumb for the practical deployment of 5G systems, where delay requirement is increasingly becoming a key concern.Keywords
Funding Information
- NSFC Major International Joint Research Project (61210002)
- Hubei Provincial Science and Technology Department (2016AHB006)
- Fundamental Research Funds for the Central Universities (2015XJGH011)
- EU FP7-PEOPLE IRSES, Project acronym CROWN (610524)
- China International Joint Research Center of Green Communications and Networking (2015B01008)
- MOE ARF Tier 2 (MOE2015-T2-2-104)
- Zhejiang Provincial Public Technology Research of China (2016C31063)
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