Erratum: Integration of d2d, network slicing, and mec in 5g cellular networks: Survey and challenges (EEE Access (2021) 9 (37590-37612) DOI: 10.1109/access.2021.3063104)

Abstract

In the above article [1], reference [2] was missing. The corrections are made in Section VI of [1]. Figures 5 and 7 of [1] are also cited.I. D2D COMMUNICATION TECHNOLOGY In cellular networks, the base stations (BS) are involved to set-up the connection between the transmitter and receiver user equipment. The transmitter sends its data to BS using the uplink (UL) channel and then the BS redirects the data to a corresponding receiver in the downlink (DL) channel. D2D communication refers to a radio technology that allows devices to directly exchange data without the use of a BS or its core network [2]. Fig. 1 clearly explains the idea of a direct communication link.(Figure Presented).A. INBAND COMMUNICATION D2D communication uses a cellular network licensed spec- trum. Based on spectrum sharing methods, inband D2D communication is divided into the overlay and underlay modes. In the overlay inband, D2D and cellular users are assigned orthogonal resources (e.g., time/frequency). Hence, there is no interference between D2D and cellu- lar users. However, it is insufffcient in terms of spec- trum efffciency (SE). In underlay inband, D2D and cellular users share time/frequency resources. Therefore, resulting in co-channel interference and efffcient interference manage- ment techniques are required. Also, this method increases SE [2]. B. OUTBAND COMMUNICATION D2D communication exploits the unlicensed ISM band also called industrial, scientiffc, and medical. Out-band 4(Figure Presented).communication eliminates interference between the users due to using a separate band instead of reusing; therefore, it requires an extra radio interface. This type of commu- nication adapts to other wireless technologies transmitting in the unlicensed band like Bluetooth and Wi-Fi. Out-band communication is further divided into two types autonomous and controlled D2D-based communication [2].