Dynamic control of RLC buffer size for latency minimization in mobile RAN

Rajeev Kumar, Andrea Francini, Shivendra Panwar, Sameerkumar Sharma

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

Abstract

5G is expected to expand the set of interactive applications enabled by the mobile network. Low end-to-end packet latency is a fundamental requirement for proper operation of those applications, but may be compromised in packet buffers shared with elastic applications that use greedy TCP sources for end-to-end transport. The accumulation of queuing delay by the elastic application degrades the latency for the interactive application, however light the throughput of the latter may be (as is the case with online gaming and over-the top voice). Buffer sharing is unavoidable in the RLC layer of the 3GPP RAN stack. To minimize its negative effect on interactive applications, we split the buffering between the RLC and PDCP layers. Then we equip the PDCP buffer with per-flow queues, and apply to the RLC buffer a new dynamic sizing mechanism that enforces the lowest queuing delay that is compatible with the existing configuration of the RLC connection. On a cellular link shared with a greedy TCP flow, our dynamic sizing solution can reduce the queuing delay of PING packets by up to two orders of magnitude compared to the default configuration with an RLC-only buffer of fixed size.

Original languageEnglish (US)
Title of host publication2018 IEEE Wireless Communications and Networking Conference, WCNC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-6
Number of pages6
ISBN (Electronic)9781538617342
DOIs
StatePublished - Jun 8 2018
Event2018 IEEE Wireless Communications and Networking Conference, WCNC 2018 - Barcelona, Spain
Duration: Apr 15 2018Apr 18 2018

Publication series

NameIEEE Wireless Communications and Networking Conference, WCNC
Volume2018-April
ISSN (Print)1525-3511

Other

Other2018 IEEE Wireless Communications and Networking Conference, WCNC 2018
CountrySpain
CityBarcelona
Period4/15/184/18/18

Keywords

  • 5G
  • Buffer management
  • Latency
  • RAN
  • RLC

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Kumar, R., Francini, A., Panwar, S., & Sharma, S. (2018). Dynamic control of RLC buffer size for latency minimization in mobile RAN. In 2018 IEEE Wireless Communications and Networking Conference, WCNC 2018 (pp. 1-6). (IEEE Wireless Communications and Networking Conference, WCNC; Vol. 2018-April). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/WCNC.2018.8377190