A Random Access Protocol for Pilot Allocation in Crowded Massive MIMO Systems

被引:109
作者
Bjornson, Emil [1 ]
de Carvalho, Elisabeth [2 ]
Sorensen, Jesper H. [2 ]
Larsson, Erik G. [1 ]
Popovski, Petar [2 ]
机构
[1] Linkoping Univ, Dept Elect Engn, SE-58183 Linkoping, Sweden
[2] Aalborg Univ, Dept Elect Syst, DK-9220 Aalborg, Denmark
关键词
Massive MIMO; random access; collision resolution; SPECTRAL EFFICIENCY; CAPACITY;
D O I
10.1109/TWC.2017.2660489
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The massive multiple-input multiple-output (MIMO) technology has great potential to manage the rapid growth of wireless data traffic. Massive MIMO achieves tremendous spectral efficiency by spatial multiplexing many tens of user equipments (UEs). These gains are only achieved in practice if many more UEs can connect efficiently to the network than today. As the number of UEs increases, while each UE intermittently accesses the network, the random access functionality becomes essential to share the limited number of pilots among the UEs. In this paper, we revisit the random access problem in the Massive MIMO context and develop a reengineered protocol, termed strongest-user collision resolution (SUCRe). An accessing UE asks for a dedicated pilot by sending an uncoordinated random access pilot, with a risk that other UEs send the same pilot. The favorable propagation of massive MIMO channels is utilized to enable distributed collision detection at each UE, thereby determining the strength of the contenders' signals and deciding to repeat the pilot if the UE judges that its signal at the receiver is the strongest. The SUCRe protocol resolves the vast majority of all pilot collisions in crowded urban scenarios and continues to admit UEs efficiently in overloaded networks.
引用
收藏
页码:2220 / 2234
页数:15
相关论文
共 32 条
[1]   Joint Spatial Division and Multiplexing-The Large-Scale Array Regime [J].
Adhikary, Ansuman ;
Nam, Junyoung ;
Ahn, Jae-Young ;
Caire, Giuseppe .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2013, 59 (10) :6441-6463
[2]  
[Anonymous], 2016, PROC IEEE GLOBAL COM
[3]  
[Anonymous], 2015, DET INV SPEC TEST PR
[4]  
[Anonymous], 2015, 25996 TR 3GPP
[5]  
[Anonymous], 2013, ICT317669METIS
[6]  
[Anonymous], P IEEE GLOB WORKSH G
[7]   Random Access Protocol for Massive MIMO: Strongest-User Collision Resolution (SUCR) [J].
Bjornson, Emil ;
de Carvalho, Elisabeth ;
Larsson, Erik G. ;
Popovski, Petar .
2016 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), 2016, :820-825
[8]   Massive MIMO for Maximal Spectral Efficiency: How Many Users and Pilots Should Be Allocated? [J].
Bjornson, Emil ;
Larsson, Erik G. ;
Debbah, Merouane .
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 2016, 15 (02) :1293-1308
[9]   Massive MIMO: Ten Myths and One Critical Question [J].
Bjornson, Emil ;
Larsson, Erik G. ;
Marzetta, Thomas L. .
IEEE COMMUNICATIONS MAGAZINE, 2016, 54 (02) :114-123
[10]   Massive MIMO Systems With Non-Ideal Hardware: Energy Efficiency, Estimation, and Capacity Limits [J].
Bjornson, Emil ;
Hoydis, Jakob ;
Kountouris, Marios ;
Debbah, Merouane .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2014, 60 (11) :7112-7139