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

Junxian Huang, Feng Qian, Yihua Guo, Yuanyuan Zhou, Qiang Xu, Z. Morley Mao, Subhabrata Sen, Oliver Spatscheck

Research output: Chapter in Book/Report/Conference proceedingConference contribution

102 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationProceedings of the SIGCOMM 2013 and Best Papers of the Co-Located Workshops
Pages363-374
Number of pages12
Edition4
DOIs
StatePublished - Dec 1 2013
EventAnnual Conference of the ACM Special Interest Group on Data Communication on the Applications, Technologies, Architectures, and Protocols for Computer Communication, ACM SIGCOMM 2013 - Hong Kong, China
Duration: Aug 12 2013Aug 16 2013

Publication series

NameComputer Communication Review
Number4
Volume43
ISSN (Print)0146-4833
ISSN (Electronic)1943-5819

Other

OtherAnnual Conference of the ACM Special Interest Group on Data Communication on the Applications, Technologies, Architectures, and Protocols for Computer Communication, ACM SIGCOMM 2013
CountryChina
CityHong Kong
Period8/12/138/16/13

Keywords

  • 4g
  • bandwidth estimation
  • lte
  • resource underutilization
  • tcp performance

Fingerprint Dive into the research topics of 'An in-depth study of LTE: Effect of network protocol and application behavior on performance'. Together they form a unique fingerprint.

Cite this