TY - JOUR
T1 - Non-Orthogonal Random Access for 5G Networks
AU - Liang, Yanan
AU - Li, Xu
AU - Zhang, Jiayi
AU - Ding, Zhiguo
N1 - Funding Information:
Manuscript received September 29, 2016; revised March 16, 2017; accepted April 27, 2017. Date of publication May 16, 2017; date of current version July 10, 2017. This work was supported in part by the National High-tech Research and Development Program of China (863 Program) under Grant 2015AA01A709, in part by the National Natural Science Foundation of China under Grant 61601020 and Grant 61371068, in part by the National Science and Technology Ministry Program under Grant 2014BAK02B04, and in part by the Fundamental Research Funds for the Central Universities under Grant 2017JBM319, Grant 2016RC013, Grant 2014JBZ002, and Grant 2016JBZ003. The work of Z. Ding was supported in part by the U.K. EPSRC under Grant EP/L025272/1 and in part by H2020-MSCA-RISE-2015 under Grant 690750. This paper was presented at the IEEE Wireless Communications and Networking Conference, San Francisco, CA, USA, March 19–22, 2017. The associate editor coordinating the review of this paper and approving it for publication was A. Banchs. (Corresponding author: Jiayi Zhang.) Y. Liang, X. Li, and J. Zhang are with the School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 2017 IEEE.
PY - 2017/7
Y1 - 2017/7
N2 - The massive amounts of machine-type user equipments (UEs) will be supported in the future fifth generation (5G) networks. However, the potential large random access (RA) delay calls for a new RA scheme and for a detailed assessment of its performance. Motivated by the key idea of non-orthogonal multiple access, the non-orthogonal RA (NORA) scheme based on successive interference cancellation (SIC) is proposed in this paper to alleviate the access congestion problem. Specifically, NORA utilizes the difference of time of arrival to identify multiple UEs with the identical preamble, and enables power domain multiplexing of collided UEs in the following access process, while the base station performs SIC based on the channel conditions obtained through preamble detection. Our analysis shows that the performance of the NORA is superior to the conventional orthogonal RA (ORA) scheme in terms of the preamble collision probability, access success probability, and the throughput of RA. Simulation results verify our analysis and further show that our NORA scheme can improve the number of the supported UEs by more than 30%. Moreover, the number of preamble transmissions and the access delay for successfully accessed UEs are also reduced significantly by using the proposed RA scheme.
AB - The massive amounts of machine-type user equipments (UEs) will be supported in the future fifth generation (5G) networks. However, the potential large random access (RA) delay calls for a new RA scheme and for a detailed assessment of its performance. Motivated by the key idea of non-orthogonal multiple access, the non-orthogonal RA (NORA) scheme based on successive interference cancellation (SIC) is proposed in this paper to alleviate the access congestion problem. Specifically, NORA utilizes the difference of time of arrival to identify multiple UEs with the identical preamble, and enables power domain multiplexing of collided UEs in the following access process, while the base station performs SIC based on the channel conditions obtained through preamble detection. Our analysis shows that the performance of the NORA is superior to the conventional orthogonal RA (ORA) scheme in terms of the preamble collision probability, access success probability, and the throughput of RA. Simulation results verify our analysis and further show that our NORA scheme can improve the number of the supported UEs by more than 30%. Moreover, the number of preamble transmissions and the access delay for successfully accessed UEs are also reduced significantly by using the proposed RA scheme.
KW - access delay
KW - collision probability
KW - Random access
KW - throughput
UR - http://www.scopus.com/inward/record.url?scp=85029090817&partnerID=8YFLogxK
U2 - 10.1109/TWC.2017.2703168
DO - 10.1109/TWC.2017.2703168
M3 - Article
AN - SCOPUS:85029090817
SN - 1536-1276
VL - 16
SP - 4817
EP - 4831
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 7
M1 - 7929338
ER -