Combinatorial code designs for ultra-reliable IoT Random access

Christopher Boyd, Roope Vehkalahti, Olav Tirkkonen

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

3 Citations (Scopus)
37 Downloads (Pure)


We consider Combinatorial Code Designs (CCD) for ensuring ultra-reliability in the random access channel. By constructing user-specific repetition patterns to be utilised over a synchronised uplink frame consisting of a number of access slots, we guarantee successive reception up to a given number of simultaneously active users. Employing advanced receivers capable of Successive Interference Cancellation (SIC) further improves reliability. As an example, we consider a system with access frames of 24 bundled slots, repetition factor 3, and reliability target 99.999%. When compared to slotted repetition ALOHA, SIC provides a 30% gain in the tolerated user activity; CCD a 30% gain; whereas CCD combined with SIC provides a gain of more than 700%. These gains come at the cost of a strict limit on the supported user population. In the given example, the system can support a total of 2024 users.

Original languageEnglish
Title of host publication2017 IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
Subtitle of host publicationEngaged Citizens and their New Smart Worlds, PIMRC 2017 - Conference Proceedings
Number of pages5
ISBN (Electronic)9781538635315
Publication statusPublished - 14 Feb 2018
MoE publication typeA4 Article in a conference publication
EventIEEE International Symposium on Personal, Indoor and Mobile Radio Communications - Montreal, Canada
Duration: 8 Oct 201713 Oct 2017
Conference number: 28

Publication series

NameIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications workshops
ISSN (Electronic)2166-9589


ConferenceIEEE International Symposium on Personal, Indoor and Mobile Radio Communications
Abbreviated titlePIMRC


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  • Coding for Machine-type Communications

    Pääkkönen, J., Deng, J., Tirkkonen, O., Singh, B., Boyd, C., Liao, J., Shahbaztabar, D., Pllaha, T. & Vehkalahti, R.


    Project: Academy of Finland: Other research funding

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