Electrical and Electronic Engineering - Research Publications

Permanent URI for this collection

http://hdl.handle.net/11343/362

Filters

2014 - 2020 3
3
Reset filters

Settings
Statistics
Citations
Author: Jayasundara, Chamil × Author: Nirmalathas, Ampalavanapillai × Author: Ranaweera, Chathurika × Author: Wong, Elaine × Start date: 2012 ×

Search Results

Now showing 1 - 3 of 3
  • Item
    Thumbnail Image
    An Efficient Resource Allocation Mechanism for LTE-GEPON Converged Networks
    Ranaweera, C ; Wong, E ; Lim, C ; Nirmalathas, A ; Jayasundara, C (SPRINGER, 2014-07)
  • Item
    Thumbnail Image
    Estimating Video Popularity From Past Request Arrival Times in a VoD System
    Wang, T ; Jayasundara, C ; Zukerman, M ; Nirmalathas, A ; Wong, E ; Ranaweera, C ; Xing, C ; Moran, B (Institute of Electrical and Electronics Engineers (IEEE), 2020-01-31)
    Efficient provision of Video-on-Demand (VoD) services requires that popular videos are stored in a cache close to users. Video popularity (defined by requested count) prediction is, therefore, important for optimal choice of videos to be cached. The popularity of a video depends on many factors and, as a result, changes dynamically with time. Accurate video popularity estimation that can promptly respond to the variations in video popularity then becomes crucial. In this paper, we analyze a method, called Minimal Inverted Pyramid Distance (MIPD), to estimate a video popularity measure called the Inverted Pyramid Distance (IPD). MIPD requires choice of a parameter, $k$ , representing the number of past requests from each video used to calculate its IPD. We derive, analytically, expressions to determine an optimal value for $k$ , given the requirement on ranking a certain number of videos with specified confidence. In order to assess the prediction efficiency of MIPD, we have compared it by simulations against four other prediction methods: Least Recency Used (LRU), Least Frequency Used (LFU), Least Recently/Frequently Used (LRFU), and Exponential Weighted Moving Average (EWMA). Lacking real data, we have, based on an extensive literature review of real-life VoD system, designed a model of VoD system to provide a realistic simulation of videos with different patterns of popularity variation, using the Zipf (heavy-tailed) distribution of popularity and a non-homogeneous Poisson process for requests. From a large number of simulations, we conclude that the performance of MIPD is, in general, superior to all of the other four methods.
  • Item
    Thumbnail Image
    5G C-RAN With Optical Fronthaul: An Analysis From a Deployment Perspective
    Ranaweera, C ; Wong, E ; Nirmalathas, A ; Jayasundara, C ; Lim, C (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2018-06-01)