Title page for etd-0611114-212043


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URN etd-0611114-212043
Author Chang-Yu Chien
Author's Email Address No Public.
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Department Communications Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Throughput Improvement using Adaptive MCS for Multiple Multicasting in Cellular Networks
Date of Defense 2014-06-30
Page Count 64
Keyword
  • channel quality
  • multiple multicasting
  • multi-hop
  • MCS
  • relay station
  • Abstract Adding a relay station (RS) to form a multi-hop network can reduce the transmission distance which naturally improves channel quality. In video streaming on a multicast tree, BS conventionally chooses a modulation and coding scheme (MCS) to cope with a link with the worst channel quality. Although this conservative approach can guarantee the accuracy of data transfer, it adversely sacrifices the system throughput because it loses the opportunity for choosing a better MCS. Most of the previous researches focused on how to determine a suitable MCS according to channel quality, but they ignored that different users may have different requirements for video quality. To remedy this problem, in this thesis, we first propose three types of adaptive MCS for a multicast network with a tree structure: (1) WMPT (Worst Modulation per Tree), (2) WMPH (Worst Modulation per Hop), and (3) ISMM (In-Sequence Multiple Multicasting). WMPT chooses the worst modulation among all links in a tree to do multicasting. WMPH chooses the worst modulation among all links in each hop to do multicasting. ISMM uses multiple multicast trees in a sequence according to the channel quality of the transmission path. MATLAB simulation is performed to compare the performance of the three different types of adaptive MCS. Simulation results show that although ISMM may exhibit higher end-to-end delay than WMPT and WMPH, it can significantly increase the throughput of overall system. Finally, in ISMM, we come up with mathematical equations to compute the extra delay required at every relay station.
    Advisory Committee
  • Chungnan Lee - chair
  • Zi-Tsan Chou - co-chair
  • Tsang-Ling Sheu - advisor
  • Files
  • etd-0611114-212043.pdf
  • Indicate in-campus at 1 year and off-campus access at 2 year.
    Date of Submission 2014-07-11

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