This work summarizes the state of the art
information related to scenarios and architectures from Energy-
efficient High-speed Cost Effective Cooperative Backhaul for
LTE/LTE-A Small-cells (E-COOP) technologies. One of the
proposed architectures exploits infrastructure based on small cell
deployment using RRU technology which is connected to the core
network using backhaul technology based on fibre optic links. In
E-COOP, we go beyond this by addressing four key scenarios in
terms of fronthaul deployment strategy (scenario 1) for C-RAN
and carrier aggregation (scenario 2). The third scenario exploits
the C-RAN architecture to firstly split the control/ data plane
where the macro base station improves the signalling service for
the whole area. Also, mobile small cells (SCs) are cooperatively
specialized towards delivering data services for high-rate
transmission with light overhead control and appropriate air
interface (mmWave) – scenario 3. This raises significant research
challenges in terms of mobile small cell coexistence, and mobility
management. In scenario 4, we consider SON in LTE-A for
HetNets with ultra-dense small cell deployment with imperfect
backhaul. A Primary Network is considered that is overlaid with
a cognitive network of Small Cell Networks, performing local
sensing and local self-configuration and -optimization algorithms.