Two-Phase Random Access Procedure for LTE-A Networks
Simultaneous random access attempts from massive machine-type communications (mMTC) devices may severely congest a shared physical random access channel (PRACH) in mobile networks. This paper presents a novel two-phase random access (TPRA) procedure to deal with the congestion caused by mMTC devices...
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| Veröffentlicht in: | IEEE transactions on wireless communications 2019-04, Vol.18 (4), p.2374-2387 |
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| container_title | IEEE transactions on wireless communications |
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| creator | Cheng, Ray-Guang Becvar, Zdenek Huang, Yi-Shin Bianchi, Giuseppe Harwahyu, Ruki |
| description | Simultaneous random access attempts from massive machine-type communications (mMTC) devices may severely congest a shared physical random access channel (PRACH) in mobile networks. This paper presents a novel two-phase random access (TPRA) procedure to deal with the congestion caused by mMTC devices accessing the PRACH. During the first phase, the TPRA splits the mMTC devices into smaller groups according to a preamble selected randomly by the devices. Then, in the second phase, each group of devices is assigned with a dedicated channel to complete the random access procedure. The proposed concept allows a base station to adjust the number of dedicated channels in real-time according to the actual network load. We then present an analytical model to estimate the access success probability and the average access delay of the TPRA. Finally, we propose a simple formula to determine the optimal number of random access resources for the second phase of the proposed TPRA. Simulations are carried out to validate the analytical models and to demonstrate the benefits of the TPRA compared to competitive techniques. |
| doi_str_mv | 10.1109/TWC.2019.2903479 |
| format | Article |
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This paper presents a novel two-phase random access (TPRA) procedure to deal with the congestion caused by mMTC devices accessing the PRACH. During the first phase, the TPRA splits the mMTC devices into smaller groups according to a preamble selected randomly by the devices. Then, in the second phase, each group of devices is assigned with a dedicated channel to complete the random access procedure. The proposed concept allows a base station to adjust the number of dedicated channels in real-time according to the actual network load. We then present an analytical model to estimate the access success probability and the average access delay of the TPRA. Finally, we propose a simple formula to determine the optimal number of random access resources for the second phase of the proposed TPRA. 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| source | IEEE Electronic Library (IEL) |
| subjects | analytical model Analytical models Computer simulation Delays Dynamic scheduling Electronic devices massive machine-type communications Mathematical models Mobile communication systems Performance evaluation Random access Real-time systems Resource management Wireless communication Wireless communications Wireless networks |
| title | Two-Phase Random Access Procedure for LTE-A Networks |
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