Department of Computer Science and Information Systems
Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1928
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Item Network discovery and user preferences for network selection in 3G-WLAN interworking environment(IEEE, 2013) Gupta, VishalIn a heterogeneous networking environment vertical handover decision plays a very crucial role in the overall handover process as wrongly selected network spoils the overall purpose of Always Best Connected (ABC). For it many decision models, based on diverse parameters and techniques, have been proposed. In this paper, following two requirements which most of such models require are emphasized: a) Network information other than that available in the corresponding network advertising frame to get the values of the decision parameters considered and b) User Preferences because it is the user satisfaction which is one of the ultimate aim of vertical handover process and different users can have different preferences on the same parameter. It is shown that how additional information can be stuffed in the Information Element's LENGTH field of 802.11 compatible beacon frame. Also, capturing user preferences is modeled primarily on the parameters derived from the fields added by IEEE 802.11u to the beacon frame. The proposed technique for it, called Analytic Hierarchy Process (AHP), is also made more effective by measuring its criticisms.Item Information Embedding in IEEE 802.11 Beacon Frame(International Journal of Computer Applications, 2012) Rohil, Mukesh Kumar; Gupta, VishalAccording to IEEE 802.11 protocol, beacon frames are periodically transmitted by the Access Point (AP) and carry mostly network specific information. All the wireless stations (or wireless clients) with in the "vicinity" of transmission range of AP receive corresponding beacon and use the information embedded in it for various purposes. The arrangement of information in beacon is standardized by 802.11, thus facilitating communication between different devices manufactured by different vendors. Also, the IEEE 802.11-2007 is the base protocol and its several amendments have been published by IEEE till date. In this paper we show that with out breaching the standard, where additional non-standard information can be embedded on the transmitted fields of 802.11 beacon frame. This facilitates the non-standard, vendor/network specific communication of information from AP to wireless clients without Association.Item Bit-Stuffing in 802.11 Beacon Frame: Embedding Non-Standard Custom Information(International Journal of Computer Applications, 2013-02) Gupta, Vishal; Rohil, Mukesh KumarIn an infrastructure Basic Service Set (BSS) beacon frames are transmitted periodically by the Access Point (AP) and announce the presence of a wireless network. It mainly consists of network specific information and thus one of its main purposes is the "advertisement" of this information. Based on this information mobile devices can take many decisions, for example, whether to attempt association with the network or not. To facilitate the communication between devices developed by different vendors, IEEE 802.11 standardizes the arrangement of this information in beacon frames. Often it is required to embed non-standard vendor/network specific additional information in the beacon frame. In this paper we show that without disturbing the arrangement of information as per the standard, how the IEEE 802.11-2012 compatible beacon frames can be overloaded with additional non-standard information. Moreover, the 802.11 standard limits the maximum size of the beacon frame. In this perspective we also show that how to send large amount of information in multiple successive beacon frames using the already implemented concept of fragmentation and sequence numbers. The proposed technique is flexible in terms of fields used for embedding the information and maximizes the number of additional non-standard information octets per beacon. The results of its implementation in ns-3 simulator are also shown.