Design of an enhanced bearer buffer for latency minimization in the mobile RAN

Rajeev Kumar, Andrea Francini, Shivendra Panwar, Sameerkumar Sharma

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

Abstract

5G will transform the cellular network from a generic supplier of high-speed data to a flexible, super-fast, and highly-reliable communications medium that supports diverse sets of services and applications. Low packet latency is a critical enabler for the interactivity features of many of these applications, but maybe compromised in saturated packets buffers if the buffers are oversized, as is often the case in the RLC layer of the 3GPP RAN stack. To protect all interactive applications from excessive buffering, we completely revise the flow-control component of a prior solution of ours that splits the per-bearer buffer between the RLC and PDCP layers and regulates the packet flow between the two buffers so that queue build-up in the RLC layer is constrained. On a cellular link shared with a greedy TCP flow, our new enhanced bearer buffer (EBB) design with continuous flow control (CFC) reduces the latency of packets from low-bandwidth interactive applications by at least 80% compared to previous EBB versions, and by orders of magnitude compared to the default bearer configuration with a large RLC buffer. The CFC also benefits throughput-intensive interactive applications like augmented and virtual reality because it confines the buffering within the PDCP layer, where it can be effectively controlled with active queue management techniques.

Original languageEnglish (US)
Title of host publication2019 IEEE Global Communications Conference, GLOBECOM 2019 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728109626
DOIs
StatePublished - Dec 2019
Event2019 IEEE Global Communications Conference, GLOBECOM 2019 - Waikoloa, United States
Duration: Dec 9 2019Dec 13 2019

Publication series

Name2019 IEEE Global Communications Conference, GLOBECOM 2019 - Proceedings

Conference

Conference2019 IEEE Global Communications Conference, GLOBECOM 2019
CountryUnited States
CityWaikoloa
Period12/9/1912/13/19

Keywords

  • 5G
  • Buffer management
  • Fairness
  • Flow control
  • Interactivity
  • Low latency
  • RAN
  • RLC

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems
  • Signal Processing
  • Information Systems and Management
  • Safety, Risk, Reliability and Quality
  • Media Technology
  • Health Informatics

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  • Cite this

    Kumar, R., Francini, A., Panwar, S., & Sharma, S. (2019). Design of an enhanced bearer buffer for latency minimization in the mobile RAN. In 2019 IEEE Global Communications Conference, GLOBECOM 2019 - Proceedings [9013476] (2019 IEEE Global Communications Conference, GLOBECOM 2019 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/GLOBECOM38437.2019.9013476