Arathi R Shankar

Efficient Routing Protocol for Hand over Delay Minimization in Mobile WiMAX using Concurrent Scanning

In this article an efficient routing protocol has been identified for real time and non – real time applications.The MS movement direction prediction (MMDP) based MS scanning is implemented to overcome the mobile WiMAX handover issues. Here the authors have used the MMDP method to reduce the number of scanning’s required for the handover instead of scanning for all neighboring BSs and suggested that on using the concurrent scanning procedure for the best two TBS high quality hand over support in Mobile WiMAX can be achieved. On performing concurrent scanning of two best target base stations, issues like ideal sectors, network congestion and fast change in RSS are proposed to be minimized.The proposed algorithm targets to meet the quality of service requirements. Performance results for simulation scenarios are presented and discussed.

An Analytical Approach to Qualitative Aspects of WiMAX Physical Layer

In last few years there has been significant growth in the area of wireless communication. Quality of Service (QoS) has become an important consideration for supporting variety of applications that utilize the network resources. IEEE 802.16/WiMAX is a new network which is designed with quality of service in mind. This paper focuses on the comparison of quality of service parameters between different channels in WiMAX physical layer. Orthogonal frequency division multiple access is used by WiMAX on its physical layer. Orthogonal frequency division multiple access uses adaptive modulation technique on the physical layer of WiMAX and it uses the concept of cyclic prefix that adds additional bits at the transmitter end. The signal is transmitted through the channel and it is received at the receiver end. Then the receiver removes these additional bits in order to minimize the inter symbol interference, to improve the bit error rate and to reduce the power spectrum. In the analysis, a WiMAX module developed based on popular network simulator MATLAB is used.

Accumulative distance based optimized scanning for a LTE network

Mobility in any network is an issue when the User Equipment (UE) moves and is handed over between evolved NodeB (eNBs). These unnecessary handovers lead to additional eNB scanning, handover delay, MAC overhead and it will have impact on real time applications. The reduction in the scanning delay is vital in any network as all the data transmissions are paused until the handover procedure is completed. In this paper authors have made an attempt to predict the direction of movement of the User Equipment (UE) of LTE network in order to overcome the handover issues. This uses a scheme known as Mobile Station (MS) movement direction prediction (MMDP) based handover. In this method, only selected eNBs will be involved in the process of scanning. Hence repeated scanning of all neighboring Base stations is avoided and only shortlisted Base Stations are scanned. Further the available free channels and the received signal strength (RSSI) values are considered to select the potential target eNB.

Mobile WiMAX Performance Improvement Using MRRC Scheme for Real-Time Application

IEEE 802.16e (or) Mobile WiMAX is the network which is designed with the quality of service in mind. In this paper, an attempt has been made to qualitatively analyze the performance factors of Mobile WiMAX under flat-fading Rayleigh channel using MRRC techniques. The physical layer of Mobile WiMAX is simulated by using maximal ratio combining diversity techniques. The physical layer performance parameters have been measured and compared by increasing the number of diversity branches and by employing different modulation techniques. Proposed diversity scheme is compared with respect to throughput and Bit error rate by employing different modulation schemes for a real-time application.