The 5 th generation (5G) of mobile radio access technologies is expected to become available for commercial launch around 2020. In this paper, we present our envisioned 5G system design optimized for small cell deployment taking a clean slate approach, i.e. removing most compatibility constraints with the previous generations of mobile radio access technologies. This paper mainly covers the physical layer aspects of the 5G concept design.I.

The current wireless access networks are able to provide relatively low data rates when compared to wired access. In order to extend the access to high data rate services to wireless users, the International Telecommunication Union (ITU) established new requirements for future wireless communication technologies of up to 100Mbps in high mobility conditions and 1Gbps in low mobility. The low mobility goal can only be achieved through the use of highly optimized local area access networks, operating at low range and low transmission power. The efficient sharing of radio resources among local area cells will be very difficult to achieve with a traditional network planning/dimensioning approach due to their intrinsic uncoordinated deployment characteristic. Cognitive Radio (CR) based networking methodologies are considered as the most promising solutions for such radio resource sharing problems, enabling also unlicensed/open spectrum operations. In this paper, a Game Theory inspired scalable algorithm for Inter-Cell Dynamic Spectrum Access (IC-DSA) is introduced in order to enable distributed resources allocation in CR environments. The new CR-based cell is called here Cognitive Cell (C-cell), and it is the minimal entity which allocates a resource set. The simulation results demonstrate the effectiveness of the proposed spectrum sharing approach. This solution achieves a better overall performance in several load and interference scenarios in terms of both outage and average capacity when compared to fixed frequency reuses cases.

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