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An in-depth study of LTE: effect of network protocol and application behavior on performance

Published: 27 August 2013 Publication History

Abstract

With lower latency and higher bandwidth than its predecessor 3G networks, the latest cellular technology 4G LTE has been attracting many new users. However, the interactions among applications, network transport protocol, and the radio layer still remain unexplored. In this work, we conduct an in-depth study of these interactions and their impact on performance, using a combination of active and passive measurements. We observed that LTE has significantly shorter state promotion delays and lower RTTs than those of 3G networks. We discovered various inefficiencies in TCP over LTE such as undesired slow start. We further developed a novel and lightweight passive bandwidth estimation technique for LTE networks. Using this tool, we discovered that many TCP connections significantly under-utilize the available bandwidth. On average, the actually used bandwidth is less than 50% of the available bandwidth. This causes data downloads to be longer, and incur additional energy overhead. We found that the under-utilization can be caused by both application behavior and TCP parameter setting. We found that 52.6% of all downlink TCP flows have been throttled by limited TCP receive window, and that data transfer patterns for some popular applications are both energy and network unfriendly. All these findings highlight the need to develop transport protocol mechanisms and applications that are more LTE-friendly.

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Published In

cover image ACM SIGCOMM Computer Communication Review
ACM SIGCOMM Computer Communication Review  Volume 43, Issue 4
October 2013
595 pages
ISSN:0146-4833
DOI:10.1145/2534169
Issue’s Table of Contents
  • cover image ACM Conferences
    SIGCOMM '13: Proceedings of the ACM SIGCOMM 2013 conference on SIGCOMM
    August 2013
    580 pages
    ISBN:9781450320566
    DOI:10.1145/2486001
Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 27 August 2013
Published in SIGCOMM-CCR Volume 43, Issue 4

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Author Tags

  1. 4g
  2. bandwidth estimation
  3. lte
  4. resource underutilization
  5. tcp performance

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  • (2024)Challenges of CPS/IoT Network Architecture in 6G EraIEEE Access10.1109/ACCESS.2024.339536312(62804-62817)Online publication date: 2024
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