Journal
WIRELESS COMMUNICATIONS & MOBILE COMPUTING
Volume 2021, Issue -, Pages -Publisher
WILEY-HINDAWI
DOI: 10.1155/2021/5523273
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Funding
- ROIS NII Open Collaborative Research [2020-20S1202, 2020-20S0502]
- National Natural Science Foundation of China [62062031, 61771429]
- Inner Mongolia Natural Science Foundation, China [2019MS06035]
- Inner Mongolia Science and Technology Major Project, China
- JSPS KAKENHI, Japan [18KK0279, 19H04093, 20H00592]
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This paper focuses on D2D communication in the unlicensed spectrum, highlighting the importance of using unlicensed frequency bands to enhance network performance, and emphasizes the need to design a fair coexistence scheme.
By enabling direct communications between nearby user equipment (UE), device-to-device (D2D) communication has become one of the key technologies in 5th generation (5G) mobile networks. D2D communication brings new communication opportunities for mobile devices, especially in a highly dense network In this paper, D2D communication in the unlicensed spectrum, namely, D2D-Unlicensed (D2D-U), is discussed. The use of unlicensed frequency bands can ease the shortage of spectrum resources and improve network performance. However, the D2D-U in 5G has significant effects on the network performance of existing unlicensed networks sharing the same frequency bands, such as Wi-Fi and Bluetooth. Therefore, it is necessary to design a fair coexistence scheme for D2D-U. To understand the coexistence problem, in this paper, we first formulate the network performance of D2D-U and Wi-Fi under two different coexistence schemes, namely, listen before talk (LBT) and duty cycle mechanism (DCM). Then, we use computer simulations to investigate a mode selection scheme that switches between these two schemes and point out the best possible solution for the coexistence between D2D-U and Wi-Fi.
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