Efficient Scheduling to Reduce Latency for Signaling Traffic using CMT-SCTP
2016 (English)In: 27th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), September 4-7, Valencia, Spain, IEEE Communications Society, 2016Conference paper (Refereed)
To mitigate delay spikes during transmission of bursty signaling traffic, concurrent multipath transmission (CMT) over several paths in parallel could be an option. Still, unordered delivery is a well known problem when concurrently transmitting data over asymmetric network paths, leading to extra delay due to Head-of-Line Blocking (HoLB). The Stream Control Transmission Protocol (SCTP), designed as a carrier for signaling traffic over IP, is currently being extended with support for CMT (CMT-SCTP). To reduce the impact of HoLB, SCTP has support for transmission of separate data flows, called SCTP streams. In this paper, we address sender scheduling to optimize latency for signaling traffic using CMT-SCTP. We present dynamic stream-aware (DS) scheduling, which utilizes the SCTP stream concept, and continuously considers the current network status as well as the data load to make scheduling decisions. We implement a DS scheduler and compare it against some existing schedulers. Our investigation suggests that DS scheduling could significantly reduce latency compared to dynamic path scheduling that does not consider streams. Moreover, we show that naive round-robin scheduling may provide low latency over symmetric network paths, but may transmit data on non-beneficial asymmetric network paths leading to increased latency. Finally, our results show that a static stream based approach, found beneficial for bulk traffic, is not appropriate for bursty signaling traffic.
Place, publisher, year, edition, pages
IEEE Communications Society, 2016.
CMT-SCTP, real-time traffic, latency; scheduling, signaling, QoS
Research subject Computer Science
IdentifiersURN: urn:nbn:se:kau:diva-42634OAI: oai:DiVA.org:kau-42634DiVA: diva2:933618
27th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) September 4-7, Valencia, Spain