SDN Based D2D Communication In LTE: Long Term Evaluation (LTE) is a communication standard evolved from Third Generation Partnership Project (3GPP) known as UMTS (Universal Mobile Telecommunication System).
It introduces Multi Input multi-output (MIMO) to ensure high-speed data transmission at a higher data rate of 300Mbps peak downlink and 75 Mbps peak uplink.
It also provides connectivity of cellular network with the Internet using IP network equipment LTE support high data required services such as Voice over IP (VoIP), Video
conferencing and multimedia streaming in a cellular network.
It uses multiple radio access techniques and uses both Time Division Duplex (TDD) and FDD for downlink and uplink high data rate communication and improves spectrum efficiency.
The working component of LTE are User Equipment (UE), eNodeB (access point), and EPC i.e. Evolved Packet Core. UE is actually a mobile used to link the user with the access network.
The access network is an Evolved UMTS Terrestrial Radio Access.
LTE, a major contributor in IoT, promise high data rate and low latency but despite these facts, LTE technologies encounter many issues of centralised control, Scalability and QoS challenges in the network.
Centralised management and spectrum adjustment by operator minimises the automatic and dynamic control and management of the cellular network.
In this context, several studies have been conducted based on the integration of LTE with SDN.
LTE network reconfiguration is proposed using SDN based on D2D communication devices and ensure Quality of Experience (QoE) which is measured on the basis of Mean Opinion Score (MOS).
Liu et al. proposed an algorithm for multi-tier LTE network reconfiguration for downlink and uplink based on a D2D communication protocol in case of congestion on the nearest eNBs.
The parameters used to measure performance are download speed and waiting for the delay because of congestion in the adjacent eNBs.
Savarese et al. proposed a Flexible approach for the reconfiguration and resource allocation in LTE environment when acting as IoT by observing context and connects various types of monitoring terminal devices and the Internet without human interaction.
They use context-aware information and geophysical location for their proposed framework architecture for heterogeneous M2M devices over LTE/4G network with SDN controller and context-Aware Application (CAA) running over M2M server identifies the failure of certain eNB and informs SDN about the status.
In CellSDN a cellular architecture based on SDN in which attribute-based policies are formulated for individual user in the LTE network and gain fine grain control over the network.
CellSDN also proposed for SDN application for deep packet inspection by the local cell agent running in each switch.
This local agent in CellSDN can increase scalability by reducing the excessive load on the controller. read full pdf here
