Interpreting High Speed Data Plan Service Challenges of Multi-hop Relay-Enhanced WiMAX Networks
International Conference on Communication and Computer Networks of the Future. Computer Society of India - COMNET 2014
Venue: P.S.G College of Technology, India – March 14th-15th 2014
Interpreting High Speed Data Plan Service Challenges of Multi-hop Relay-Enhanced WiMAX Networks And The Reliability Concept of Long Term Evolution Advanced (LTE-A)in 4G Wireless Technology
Richmond Adebiaye, PhD, CISSP, CISM, CCIE
Program Director for Computer & Information Systems, Parker University, Dallas, Texas, Radebiaye@parker.edu
Abstract - WiMAX 802.16 standard was perhaps the most promising Radio Access Technology for providing high speed broadband connectivity to subscribers over large geographic regions. The primary objective then was focused on providing a point to multi-point (PMP) single hop service especially from single base station (BS) to several users with subscriber stations (SSs). However, due to severe limitations in its capacity, the high demand for high speed data service and the technological advancement in mobile and wireless services, extensions were standardized which include a mesh mode, physical layers and extensions for mobility. One of the extensions was the IEEE 802.16j multi-hop relay specification amendment which focused on the development of simple and lower cost relay stations (RSs) that can enhance network coverage and capacity. Even with the extensions, in practice there are still problems such as coverage holes due to ‘shadowing, poor signal to interference and noise ratio (SINR) for the SSs’ that are far away from the Base Stations (BS), cost of serving few Subscribers Stations (SSs) or few users, cost of deployments of Relay Stations (RSs) to increase cell capacity and the challenges of using RSs on both capacity and coverage enhancement. The currently evolving Long Term Evolution Advanced (LTE-A) standard also considers multi-hop relaying as an essential feature and the reliability problems still persists on the in-band relaying compared to the out-of band relaying which decreased capacity because of the half-duplex feature. This paper provides an overview of the challenges of multi-hop relay enhanced WiMAX network concept and its impact in its deployment and within the LTE-Advanced framework. This paper will propose methods to improve both the capacity enhancement and cost-effective coverage extension by analyzing the Orthogonal Frequency Division Multiplexing (OFDM) and adaptive modulation used to enhance performance in both the 3G and 4G Technologies.
Index Terms – Multi-hop Relay-Enhanced WiMAX; relay deployment; high speed; data plan