Dynamic buffer sizing and pacing as enablers of 5G low-latency services
Rights accessOpen Access
European Commission's project5G-AURA - Application-aware User-centric Programmable Architectures for 5G Multi-tenant Networks (EC-H2020-675806)
3GPP standards organization is performing an impressive effort trying to reach sub-millisecond latencies for 5G. However, such efforts may become fruitless if exogenously generated delays at transport layer are not considered. Nowadays, Radio Access Networks (RANs) are deployed with large buffers to achieve full utilization and avoid squandering wireless resources. Unfortunately, and since the data path’s bottleneck resides on the radio link, RAN’s buffers are bloated by TCP’s congestion control algorithm. Thus, a flow with low-latency requirements that encounters a bloated buffer, suffers from inevitable large sojourn times associated with the buffer depletion time, severely downgrading its Quality of Service (QoS). This paper presents different solutions for efficiently multiplexing distinct traffic patterns that share buffers on the 5G stack. Bufferbloat is extensively studied within the actual 5G QoS scenario, which presents multiple challenges inherited from the dynamic radio link nature and the presence of multiple queues at different entities. We propose and extensively emulate different algorithms in order to avoid the exogenous delay caused by the bufferbloat phenomena.We use real cellular network traces with realistic delay-sensitive and background traffic patterns in different scenarios. The outcome presents valuable insights in the algorithms that will enable low-latency services to be delivered through the 5G network stack satisfying restrictive envisioned constraints.
© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
CitationIrazabal, M. [et al.]. Dynamic buffer sizing and pacing as enablers of 5G low-latency services. "IEEE transactions on mobile computing", 17 Agost 2020, p. 1-15.
- Departament d'Enginyeria Telemàtica - Articles de revista 
- Departament d'Enginyeria Minera, Industrial i TIC - Articles de revista 
- Doctorat en Enginyeria Telemàtica - Articles de revista 
- WNG - Wireless Network Group - Articles de revista 
- CIRCUIT - Grup de Recerca en Circuits i Sistemes de Comunicació - Articles de revista 
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder