With the exponentially increasing demand for wireless data traffic in recent years, it is infeasible for current cellular system architectures to satisfy gigabit-level data traffic in an economical and ecological way [3]. One of the solutions is the small cell network, which is densely deployed by self-organizing, lowcost, and low-power small cell base stations (SBSs). In early studies, a low number of small cells is adopted to improve the signal-to-interference-and-noise ratio (SINR) of wireless links in limited hot areas, embedded in conventional cellular networks. In this case, a little burst backhaul traffic originating from small cells can be forwarded into the core network by the traditional backhual link of cellular networks. When small cells are ultra densely deployed in cellular networks, it is a key problem to forward massive backhaul traffic into the core network. Moreover, there is concern that the large number of small cells will cause the signaling load on the network nodes to increase due to frequent handovers and degraded mobility robustness due to increased handover and radio link failures [4]. The impact of small cell deployments on mobility performance in Long Term Evolution (LTE)-Advanced systems was investigated by system-level simulations [5]. Simulation results implied that the handover optimization technique can effectively decrease the handover failure rate. With rapidly developing point-to-point microwave technologies, the wireless backhaul solution is becoming an attractive alternative for small cell networks. Based on simulation and measurement results, the microwave backhaul technology at high frequencies was a viable high-performance solution for wireless small cell backhaul links in non-line-of-sight (NLOS) [6]. Moreover, the high-performance NLOS backhaul link using higher frequencies compared to sub-5 GHz frequencies can provide higher antenna gain for similar antenna sizes. This makes it possible to design small, compact, point-to-point fixed backhaul links with hundreds of gigabits per second throughput. 60 GHz and 70–80 GHz millimeter wave communication technologies for high-capacity last mile and pre-aggregation backhaul were explored in [7]. In addition, orthogonal frequency-division multiplex (OFDM) access passive optical networks were discussed as the optical technology complement for enabling flexible cost-efficient hybrid coverage. According to network simulation results for demanding urban small cell backhaul application, flexible high-capacity hybrid millimeter wave/optical mobile backhaul networks presented a highly promising approach for future mobile backhaul networks. Coordinated multipoint (CoMP) technology is adopted in small cells to decrease the inter-site interference and improve the spectrum efficiency. However, additional backhaul traffic is generated due to the possibility of sharing data among cooperative small cells. The backhaul bandwidth required by different coordination technologies was discussed in [8]. On the other hand, the energy efficiency of small cell networks is of great concern as the base station (BS) density will be increased significantly. Based on the random spatial network model, the energy efficiency of small cell networks was analyzed in [9]. Numerical results showed that the energy efficiency of small cell networks critically depends on the BS power consumption model.