Abstract
Millimeter wave (mmWave) band, e.g., WiGig (60 GHz), is considered as a promising candidate of future 5G networks. Thanks to its directional communication by means of antenna beamforming, WiGig is best fitted for short range device to device (D2D) communications, which highly boost the capacity of future 5G networks. However, the use of direct beamforming training (BT) in the process of D2D neighbor discovery (ND) results in large overhead, high-energy consumptions, and low throughput of the whole WiGig D2D networks. In this paper, as standardized WiGig devices are multiband capable, i.e., it includes the unlicensed \mu W band (i.e., 2.4 and 5 GHz) and the unlicensed WiGig band (i.e., 60 GHz), an efficient paradigm for WiGig D2D networks will be proposed. In this paper, the wide coverage \mu \mathrm {W} band is used to assist the construction of WiGig D2D links. By which, each multiband WiGig device decides if it is neighbor device is in its WiGig (60 GHz) range or not based on the \mu \mathrm {W} received signal strength (RSS) from its neighbor while considering the effect of WiGig path blocking. If both devices are discoverable in the WiGig band, the WiGig D2D data link will be constructed between them under the control of the wide coverage \mu \mathrm {W} D2D link. The detailed management protocol of the proposed multiband WiGig D2D network in addition to the proposed WiGig ND algorithm is given. Mathematical and simulation analysis confirm the superiority of the proposed multiband WiGig D2D network over that using only WiGig band with WiGig direct ND.