Scheduling Latency of Midhaul-based Commodity Hardware C-RAN

Nicolas Malm, Olav Tirkkonen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

54 Downloads (Pure)


The impact of midhaul-induced latency on the performance of a wireless communication system must be understood in order to be appropriately accounted for. To this end, we study the impact of midhaul delay and jitter on the scheduling of a cloud radio access network. A soft–real-time commodity hardware testbed is used to gather data using up to 16 virtualized distributed units. The empirical data is used to develop models to analyze the midhaul latency’s impact on spectral efficiency and outage probability. Modeling takes into account the burstiness of deadline misses in order to replicate outage duration in addition to frequency. The recorded data is then used to derive an estimate of system scaling in terms of shortest transmission time interval supported for a set number of distributed units for a given deadline miss rate. Results show that scaling behavior depends on the target rate. More stringent targets emphasize the impact of tail latencies. The testbed suffers less than 0.1 % spectral efficiency loss from deadline misses at a transmission time interval duration of 500 μs with 16 distributed units.
Original languageEnglish
Title of host publicationProceedings - 2021 IEEE 4th 5G World Forum, 5GWF 2021
Number of pages6
ISBN (Electronic)978-1-6654-4308-1
Publication statusPublished - 19 Nov 2021
MoE publication typeA4 Article in a conference publication
EventIEEE 5G World Forum - Montreal, Canada
Duration: 13 Oct 202115 Oct 2021
Conference number: 4


ConferenceIEEE 5G World Forum
Abbreviated title5GWF
Internet address


  • C-RAN
  • SDR
  • midhaul
  • scheduling


Dive into the research topics of 'Scheduling Latency of Midhaul-based Commodity Hardware C-RAN'. Together they form a unique fingerprint.

Cite this