Link Stability based Handoff for QoS Provisioning In 4G Network

Future generation 4G network is considered to bring most seamless data and internet access across different devices and networks. 3G network architecture incorporates several mechanism for continues connectivity. 4G networks abstracts the communication as any form of digital data including but not limited to voice and video calls, media streaming, content sharing, cloud computing and distributed services. 4G network offers a seamless collaboration between core 3G data network, local WiMax networks, GSM networks and so on. Every core network follows it's own architecture and protocols. Therefore switching from one network to another requires techniques that ensures optimum performance and quick switching. However as every switching is performed by set of command exchange between current, bridging and new network, ensuring least frequent switching is as important an issue as determining the best network itself. Once a user opts for a specific network, data exchange within the network and through any other core networks needs QoS provisioning. Most existing protocols focuses on choosing the best network at specific time instance which never ensures either longevity of the connection or quality of it. A Link Quality is an estimation of the nature of all inbound and outbound links of a node that takes into account of power, bandwidth, jitter and latency. Therefore in this work we propose a Link Quality based routing and handoff for 4G network. Considering link quality in routing decisions rather than hops ensures that the obtained routes are optimum in terms of packet delivery and lifetime of the path.