Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (2.29) (2018) 700-703 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Cooperative GPS and Neighbors Awareness Based Device Discovery for D2D Communication in in-Band Cellular Networks O. Hayat 1 *, R. Ngah 2 , Yasser Zahedi 3 1 National University Of Modern Languages (NUML) H-9 Islamabad 2 Wireless Communication Centre (WCC) Faculty of Electrical Engineering UTM Johor Bahru Malaysia. 3 Department Of Information And Communication Engineering, Basrah University College of Science And Technology,Basrah, Iraq *Corresponding Author E-Mail: Ohayat@Numl.Edu.Pk Abstract Device to Device (D2D) communication is a new paradigm for next-generation wireless systems to offload data traffic. A device needs to discover neighbor devices on the certain channel to initiate the D2D communication within the minimum period. A device discovery technique based on Global Positioning System (GPS) and neighbor awareness base are proposed for in-band cellular networks. This method is called network-centric approach, and it improves the device discovery efficiency, accuracy, and channel capacity. The dif- ferential code is applied to measure the signal to noise ratio of each discovered device. In the case that the signal to noise ratio (SNR) of two devices is above a specified threshold value, then these two devices are qualified for D2D communication. Two procedures are explored for device discovery; discovery by CN (core network) and eNB (evolved node B) cooperation with the help of GPS and neighbor awareness. Using ‘Haversine’ formula, SNR base distance is calculated. Results show an increment in the channel capacity relative to SNR obtained for each device. Keywords: D2D Communication; SNR, GPS; CN; and eNB 1 Introduction Due to spectrum crises and its high vitality utilization wireless and mobile networks planners have been confronting the consistently expanding interest for high data rates and versatility needed by new wireless applications. In this manner, research has been begun on 5th generation wireless frameworks that are probable to be imple- mented beyond 2020 (1). One of the techniques to implement 5G is to shift the intelligence at the device level. Device to Device (D2D) Communication is one of the potential advancements in 5G. In D2D communication, two devices communicate directly without passing through the intermediate node as shown in Figure 1. Up to 4G wire- less cellular networks, D2D communication practicality has not been considered (2). The very important advantages of direct D2D communication, source devices may enjoy data rates, minimum delay, and energy efficiency. Along with that direct D2D communication alleviate congestion from the main network (3), (4). This is because it has primarily been imagined as a device level communication to mini- mize the expense of nearby service locating. Service providers can further exploit D2D effectiveness in a stadium or shopping center where a huge number of users use mobiles and share information. Their direct transmission among intelligent devices and different wireless nodes will minimize the congestion in the network. More- over, D2D communication can be utilized in public safety networks, disaster as in a quake or sea tempest. A temporary communication system can be set up utilizing D2D effectiveness as a part of a system by replacing the damaged communication system and inter- net arrangement (5). Fig. 1: D2D communication in multicell In D2D communication layout, devices most of the time is contact probing for a partner and start communication when partner found. Energy can be saved when devices start communication and data sharing when they are the vicinity of each other. Contact probing also is slightly energy consuming as results are validated in (6). In- itiating D2D communication starts with the device discovery (7) and followed by the access process. Each discovered device acts as a femtocell and fully or partially controlled by the cellular network. Cooperative use of Global Positioning System (GPS), and neighbor C1 C2 C3 D2D Link Control Link Cellular Link Cellular Link