The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Performance Evaluation of Semi-Persistent Scheduling in a Narrowband LTE System for Internet of Things

사물인터넷을 위한 협대역 LTE 시스템에서의 준지속적 스케줄링의 성능 평가

  • Received : 2016.06.03
  • Accepted : 2016.09.01
  • Published : 2016.09.30
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Abstract

In LTE networks, the base station transmits control information over the physical downlink control channel (PDCCH) including scheduling grants, which are used to indicate the resources that the user equipment uses to send data to the base station. Because the size of the PDCCH message and the number of the PDCCH transmissions increase in proportion to the number of user equipments, the overhead of the PDCCH may cause serious network congestion problems in the narrowband LTE (NB-LTE) system. This paper proposes the compact PDCCH information bit allocation to reduce the size of the PDCCH message and evaluates the performance of the semi-persistent scheduling (SPS) in the NB-LTE system. The simulation results show that the SPS can significantly reduce the signaling overhead of the PDCCH and therefore increase the system utilization.

LTE 시스템에서 단말이 기지국에 데이터를 전송하기 위해서는 기지국이 physical downlink control channel (PDCCH)을 통해 역방향 자원 할당 제어 정보를 방송해야 한다. PDCCH 메시지의 크기 및 전송 횟수는 셀 내 단말의 수에 비례하여 증가하기 때문에 narrowband LTE (NB-LTE) 시스템의 경우 다수의 단말에 의해 발생하는 PDCCH의 오버헤드 증가 문제가 네트워크에 심각한 혼잡을 발생시킬 수 있다. 본 논문에서는 PDCCH의 오버헤드 감소를 위해, 제안하는 간소화 된 PDCCH 정보 비트 구성 방법을 사용하여 PDCCH 메시지의 크기를 줄인다. 또한, PDCCH 메시지의 전송 횟수를 감소시키는 semi-persistent scheduling (SPS) 기법을 NB-LTE 시스템에 적용하여 성능을 평가한다. 모의실험을 통해 SPS의 경우 PDCCH의 오버헤드가 감소하였으며, 시스템의 사용 효율이 높아짐을 보였다.

Keywords

References

  1. ITU-R 5D/TEMP/548-E, IMT vision - Framework and overall objectives of the future development of IMT for 2020 and beyond, Apr. 2015.
  2. K. Kwon and Y. Yoo, "IoT platform for network service self-configuration based on data flow," J. Korea Info. Commun. Soc. (J-KICS), vol. 40, no. 10, pp. 2047-2053, Oct. 2015.
  3. Gartner report, Analysts to explore the disruptive impact of IoT on business, Nov. 2014.
  4. ITU-R WP 5D Meeting document, Report on the twenty-second meeting of Working Party 5D, Jun. 2015.
  5. 3GPP TR 45.820 V2.1.0, 3rd Generation Partnership Project; Technical specification group GSM/EDGE radio access network; Cellular system support for ultra low complexity and low throughput Internet of Things (Release 13), Aug. 2015.
  6. C. Yang, J. Wang, M. Wang, K. J. Zou, K. W. Yang, and M. Hua, "Over-the-air signaling in cellular communication systems," IEEE Wireless Commun. Mag., vol. 21, no. 4, pp. 120-129, Aug. 2014. https://doi.org/10.1109/MWC.2014.6882304
  7. X. Chen, W. Yang, and C. Xu, "Novel resource allocation schemes in LTE PDCCH," in Proc. IEEE ICCT, pp. 128-132, Chengdu, China, Nov. 2012.
  8. Q. Mu, L. Liu, H. Jiang, and S. Yasukawa, "A new physical downlink control channel design for MTC in LTE-Advanced," in Proc. IEEE International Symposium WPMC, pp. 294-299, Sydney, Australia, Sep. 2014.
  9. V. G. Drozdova, A. G. Nechaev, and A. V. Andreev, "The efficiency of downlink control channel utilization in LTE," in Proc. IEEE EDM, pp. 130-132, Erlagol, Russia, Jun. 2015.
  10. X. Zhang and X. Zhou, LTE-Advanced air interface technology, CRC Press, 2013.
  11. L. Li, M. Peng, and W. Wang, "Multi-user resource allocation for downlink control channel in LTE systems," in Proc. IEEE PIMRC, pp. 1499-1503, Istanbul, Turkey, Sep. 2010.
  12. N. Afrin, J. Brown, and J. Y. Khan, "Design of a buffer and channel adaptive LTE semi-persistent scheduler for M2M communications," in Proc. IEEE ICC, pp. 5821-5826, London, England, Jun. 2015.
  13. X. Lv, X. Gu, X. Deng, L. Zhang, and W. Li, "Resource allocation algorithm for VoLTE with semi-persistent scheduling," in Proc. IEEE VTC Spring, pp. 1-5, Nanjing, China, May 2015.
  14. P. Parida, S. S. Das, and S. Paul, "Performance of VoIP in presence of MIMO interference in OFDMA (LTE) networks," in Proc. IEEE VTC Spring, pp. 1-6, Dresden, Germany, Jun. 2013.
  15. Y. Shim and Y. Kim, "Data dissemination in LTE-D2D based vehicular network," J. Korea Info. Commun. Soc. (J-KICS), vol. 40, no. 03, pp. 602-612, Mar. 2015.
  16. H. Roh and J. Lee, "Mobility management of M2M devices with grouping in the LTE system," J. Korea Info. Commun. Soc. (J-KICS), vol. 37, no. 12, pp. 1119-1127, Dec. 2012.
  17. E. Dahlman, S. Parkvall, and J. Skold, 4G: LTE/LTE-Advanced for mobile broadband, Academic Press, 2nd Ed., 2014.
  18. Samsung Electronics Co., Ltd., Apparatus and method for allocating resources using codebook in a broadband wireless communication system, Korea Patent 10-2009-0034296, Apr. 2009.
  19. 3GPP TSG GERAN #67 GP-150784, Narrowband LTE - DCI concept and scheduling, Aug. 2015.
  20. 3GPP TR 36.888 V12.0.0, 3rd Generation Partnership Project; Technical specification group radio access network; Study on provision of low-cost machine-type communications (MTC) user equipments based on LTE (Release 12)," Jun. 2013.