Call Admission Control and Handoff Techniques for 3-G and Beyond Mobile Networks

Shekhar Verma,Geetam S. Tomar 사단법인 인문사회과학기술융합학회 2011 예술인문사회융합멀티미디어논문지 Vol.1 No.1

Cellular mobile communication Networks have many services and each type of Services has distinct characteristics and Quality of Service requirement. It is important issues in 3-G and beyond networks are to prepare a framework for multiple class service, which performs call admission and handoff efficiently. There have been handful existing mechanisms for improving Call Admission Control (CAC) and Handoff Techniques in mobile network but most of them have considered only single class of service or might have touched value of few classes but not beyond. In this paper we have considered 8 types of services, which are differentiated according to their: Acceptable delay in transmission, Buffering capacity, Transmission mode and Bit rate. In this approach CAC and Handoff issues are resolved by awarding calls with some Priority Number by which each call will be recognized. Another issue of collision in CAC and handoff will be resolved by priority and authority to access the channel. Performance of this frame- work for CAC and Handoff is evaluated by calculating Call Dropping probability and Call Completion probability in this paper.

Secure Linear Feedback Shift Register based IPv6 in VANET

Abhishek singh,Shekhar Verma,Geetam Singh Tomar 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.2

In this paper, Linear Feedback Shift Register (LFSR) based IPv6 address generation has been proposed for low IP acquisition time during handoff in Vehicular Adhoc Networks (VANET). The mechanism reduces handoff latency and packet loss rate by removing link layer address conflict and duplicate address detection (DAD). VANETs are characteristics by frequent handoffs that need regular address reconfiguration which increases the handoff latency. The latency increases further due to the need for DAD to prevent link layer address conflict. LFSR based IPv6 in VANET decreases the address reconfiguration time and handoff latency by providing a unique seed value in Router Advertisement (RA) which is generated through modified LFSR algorithm and is combined with vehicle’s MAC ID to give a unique host ID. Since the mechanism is able to generate different unique host ID for same MAC ID, it eliminates the need of DAD by minimizing the probability of link layer address conflict to a negligible value. This also increases the IP configuration scalability. The algorithm only modifies the control signal RA and does not require any change in the VANET architecture. Simulation results confirm that this mechanism performs better than Mobile IPv6 (MIPv6) and can be incorporated as a standard IP acquisition technique for high mobility networks like VANET.

Layer Based Query Dissemination & Reliable Data Acquisition Mechanism for Wireless Sensor & Actuator Networks

Sumeet Gupta,Shekhar Verma,Raj K. Abrol 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.2

Wireless Sensor & Actuator networks take actuation decisions based on the data collected by the deployed set of sensor nodes. The method of data acquisition, leading to decision making, could be semi-automated or fully automated. In either case, the reliable delivery of information assumes critical importance since it has a direct impact on the decision making process for subsequent action by the actuator network. This paper presents in details a novel methodology “Layer Based Time Constrained Reliable Data Acquisition Mechanism” LTCRDM, which can be utilized for reliable delivery of information, sensed periodically or in response to a query, by the sensors deployed over a geographical area to a centralized sink where the decision for eventual actuation is taken. Since the latency and reliability requirements in a WSAN are stringent, the mechanism detailed attempts delivery of maximum packets with minimum latency to ensure that estimation of the sensed event is accurate leading to correct decision making. The methodology ensures relatively low packet loss as compared to standard packet delivery mechanisms with latency time constraints. The algorithm for dissemination of query (LQDM) in the deployed nodes is also presented. Authors have provided detailed algorithm, results of simulation and observations using IEEE 802.15.4 PHY & MAC as underlying layers. Experimental results over a test-bed are also presented. A critical analysis of the results is presented for comparison against the standard methodologies in vogue.

Gaussian Profile based Vehicular Mobility Modeling

Brijesh Kumar Chaurasia,Shekhar Verma,G. S. Tomar 사단법인 인문사회과학기술융합학회 2011 예술인문사회융합멀티미디어논문지 Vol.1 No.2

The driving behavior of a person is influenced by a multitude of local and global factors. These include nature of the driver, distance between the source and destination, condition of the road selected by the driver, traffic conditions, time constraints, lane changing, overtaking actions, safe distance, reaction time etc. are vital for modeling the mobility of a vehicle and are largely determined by the driving behavior. In this paper, a profile based model has been proposed to define the mobility behavior of the vehicles. Different types of influence on the mobility have been lumped and the profile of the motion of vehicles has been modeled as a Gaussian profile. In this model, a driver, first, selects the source, destination and his path and then, selects the parameters of the profile according to his/her presumption. Simulation and results show that profile based model is able to generate realistic and smooth mobility patterns.

VANET Optimized IP Address Allocation

Brijesh Kumar Chaurasia,Shekhar Verma,Henna Parveen,G. S. Tomar 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.3

Vehicular Ad hoc network is usually deployed for minimizing hand off latency and reducing packet loss. VANET consist of vehicle to vehicle and vehicle to infrastructure communication. Vehicles form infrastructure network with the access point and infrastructure less within themselves which is called ad-hoc network. The handoff latency and packet loss is reduced with the help of front and rear vehicles. In case of no front or rear vehicles this scenario comes to halt with both handoff latency and packet loss coming into picture. So in order to remove this flaw we create a pool of IP addresses where two access points share a particular group of IP address. This paper deals with this method described in detail.

Capacitance Scaling With Different IO Standard Based Energy Efficient Bio-Medical Wrist Watch Design on 28nm FGPA

Shivani Madhok,Gaurav Verma,Ankur Bhardwa j,Himanshu Verma,Ipsita Singh,Sushant Shekhar 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.4

In this paper, we have designed an energy efficient wrist watch on 28nm FPGA. The code has been implemented in Xilinx ISE Design Suite 14.2. The device used is XC7K160T, package used is FBG676 and it is working on -3 speed grade. The wrist band will take the blood pressure as input and will tell about the state of the person wearing it. The design supports Internet of things service that’s why IP addresses are involved. This wrist band design is very helpful in biomedical areas. Research is in progress in this field. In this paper frequency is varied to obtain power consumption of Wrist Watch. Airflow has been kept 250 LFM and medium Heat sink. IO Standards has been varied in order to achieve an energy efficient device. Main emphasis has been done on MOBILE_DDR, LVTTL, HSUL_12, HSTL_I, LVCMOS33 and SSTL15 IO Standards. To design an energy efficient device we are using capacitance scaling and the capacitance is scaled down from 100pF to 20pF. During capacitance scaling, we observe that there is no change in clock power, logic power and signal power. Thermal Aware design is current research area. Analysis has been at two temperatures that is at 25 degree Celsius and at 50 degree Celsius. At the end we can conclude that the maximum power is consumed at 2.2GHz and minimum power is consumed at 1.2GHz. In respect of capacitance maximum power is consumed at 100pF and minimum power is consumed at 20pF at both temperatures at 25 degree Celsius and 50 degree Celsius.

Infrastructure based Authentication in VANETs

Brijesh Kumar Chaurasia,Shekhar Verma 보안공학연구지원센터 2011 International Journal of Multimedia and Ubiquitous Vol.6 No.2

Token Based Trust Computation in VANET

Kapil Sharma,Brijesh Kumar Chaurasia,Shekhar Verma,Geetam Singh Tomar 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.5

In vehicular ad hoc network or VANET, the safety related messages broadcast by vehicles is used by other vehicles to make critical decisions. This may trap a vehicle taking wrong decision with dire consequences and authenticated vehicles or malicious vehicles may also broadcast wrong messages. This necessitates those messages of vehicles to be trusted after authentication process of vehicles, especially in the absence of centralized authority. In this paper, token based trust computation based on network connectivity duration of vehicles in VANET is proposed. The proposed technique is based on travelling time association among vehicles or network connectivity of vehicle at the time of driving on the road. We present simulations of the proposed technique that verify its correctness and reliability in the presence of infrastructure and absence of infrastructure. Results show that the efficacy of the proposed scheme and makes it viable for secure and lightweight trusted communication in a VANET.