Random Back-Off Mechanism for Contention-Based Uplink of SCMA

  • Wei Wu
  • Yong HaoEmail author
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 463)


In the 5G mobile communication network, massive connectivity is one of the requirements. In this paper, we study the SCMA contention-based uplink to achieve massive connectivity. SCMA can provide a higher overload with limited resources. On this basis, the uplink users adopt the mechanism of random back-off to contend to access the system. The number of access users can be further increase. The traditional OFDMA and SCMA with a scheduling method were compared in the simulation. The simulation results show that our approach has a good performance in the number of access users and throughput over a certain limit.


SCMA Uplink Contention-based Random back-off 



This research is supported by Natural Science Foundation of China (Grant No. 61501136).


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Communication Research CenterHarbin Institute of TechnologyHarbinChina

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