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All India Young Scientist Award for Rajender Kumar

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RAJENDER KUMAR receives All India Young Scientist Award for the year 2007 at Bhopal for his excellent research paper in Information Technology

About Research paper

NEW QoS METRIC FOR VERTICAL HANDOVER DECISION BASED ON CHARACTERISTIC MEASUREMENTS OF CONTROL AND MANAGEMENT FRAMES IN IEEE 802.11X


Abstract (extended)


Wireless Communication in Next Generation Networks (NGN) is envisioned to integrate heterogeneous networks (WLAN/WiPAN/UMTS). To attain seamless transfer of an ongoing session (connection) in NGN, we need an optimized Vertical Handover (VHO) i.e. handover between two different air-interface standards. Each network having individual different coverage and capacity i.e. covering hotspots with high data rates and mobile cellular systems with full coverage. We have some VHO decision algorithm which helps in network selection during VHO like SAW, MEW, GRA, TOPSIS and etc. These decision algorithms are based on certain Quality of Service (QoS) metrics which include bandwidth, jitter, BER, delay. It is very important to know how these metrics have been measured since a decision has to be made to execute VHO, based on this parameter-measurement.

Experimental measurements are taken on WiLANTA software for IEEE802.11b/g analysis, from SeaSolve Company. WiLANTA software emulates the existing WLAN infrastructure and Adhoc networks. Here PHY layer and MAC layers are configured for Management & Control frames for infrastructure networks.

Paper investigates performance characteristic measurements of PHY and MAC layer in IEEE802.11x i.e. baseband measurements in terms Error Vector Measurement (EVM) and Network Allocation Vector for Management and Control frames. EVM gives the measure of modulation error. The modulation error indicates the deviation of I/Q values from ideal signal states and thus provides a measure of signal quality. Finally, EVM is introduced as a new trigger to initiate VHO Finally; EVM is introduced as a new metric to initiate VHO. Experimental results propose a new QoS trigger to initiate a new session to execute a VHO. We obtain EVM, by varying NAV (Network allocation Vector). NAV is Duration /ID field depending upon type of frame.

This field has two meanings depending on the frame type: In power save Poll messages this is the station ID and in all other frames this is duration value in micro seconds used for the NAV calculation management and control, EVM is minimized by inducting pilot signal with the subframes but it is not worth at the cost of additional bandwidth.

Different frame-type Management, Control or data) responds differently to AWGN enabled channel impairment i.e. supports different power (Eb/No) level. Data frames should be transmitted at a higher power level to obtain Lesser FCS error. Management frames can be paged at a lower power level at the cost of some data loss. If we manage to keep EVM below 20 % then frames responsible for initialization of a session for a target network (AP/BS) is linked correctly. Further to transmit and receive actual data we should keep the EVM below 5% so that maximum QoS is achieved.

For VHO, this metric qualifies the eligibility to test a data transmission.VHO decision might fall short if proper QoS metric or combination of metrics is not chosen and measured properly. This may lead to wrong selection of the target network which is the key concern for seamless transfer of an ongoing session in heterogeneous mobile broadband wireless access data networks.

RAJENDER KUMAR receives All India Young Scientist Award for the year 2007 at Bhopal for his excellent research paper in Information TechnologyRajender kumar is working as Lecturer in Electronics and Communication Engineering Dept at National Institute of Technology Kurukshetra.

He was awarded 23rd Silver Jubilee All India Young Scientist SJAIYSC Award for the year 2007 for best research paper in Information Technology Discipline.

Award was given in Bhartiya Vigyan Sammelan held at Bhopal on 25th Nov 2007 from hon’ble Chief Minister, Madhya Pradesh Shiv Raj Singh Chouhan.