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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Dynamic Resource Allocation of Random Access for MTC Devices

  • Lee, Sung-Hyung (Department of Electrical and Computer Engineering, Ajou University) ;
  • Jung, So-Yi (Department of Electrical and Computer Engineering, Ajou University) ;
  • Kim, Jae-Hyun (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2016.11.14
  • Accepted : 2017.04.09
  • Published : 2017.08.01
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Abstract

In a long term evolution-advanced (LTE-A) system, the traffic overload of machine type communication devices is a challenge because too many devices attempt to access a base station (BS) simultaneously in a short period of time. We discuss the challenge of the gap between the theoretical maximum throughput and the actual throughput. A gap occurs when the BS cannot change the number of preambles for a random access channel (RACH) until multiple numbers of RACHs are completed. In addition, a preamble partition approach is proposed in this paper that uses two groups of preambles to reduce this gap. A performance evaluation shows that the proposed approach increases the average throughput. For 100,000 devices in a cell, the throughput is increased by 29.7% to 114.4% and 23.0% to 91.3% with uniform and Beta-distributed arrivals of devices, respectively.

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