Future cellular mobile networks will be limited by the number of channels available in each cell. On the other hand, new broadband applications like video telephony will demand tight quality of service guarantees that must be met by the network at all times. Thus, advanced mechanisms for allocating these channels to incoming calls with different quality of service level will be of utmost importance. In this paper we introduce a new analytical model for cell channel allocation to multiclass traffic. Being based on Markov chains, the new model exploits the multi-class property and reduces the state space dramatically, thus enabling the solution of previously unsolvable problem classes. We additionally describe CECALL, a simulator implementing several different strategies for allocating cell channels to multiclass traffic, handoff pre-reservation and degradation of low-level call classes. The results of the analytical model are used for explaining important simulation results.
Wimax and Wifi are the telecommunication technologies that offer transmission of wireless data via a number of transmission methods such as portable or fully mobile internet access via point to multipoint links. As the size of a Wireless Network is much vast the complete network is divided into clusters. Each cluster has a cluster head that controls all nodes of the network. These networks can have a node with the mobility. The problem begins when a node moves from the cluster to outside the range of a Cluster head. In such case, the control of that node is shifted to other Cluster Head. This process is called handoff mechanism. The proposed system is the scheme to select the best cluster head for this node respective to the reliability and efficiency. The proposed work is the selection of cluster head in case of heterogeneous network. Here the heterogeneity is defined in terms of two different networks these are Wimax and Wifi Networks. The process of handover between these networks is called vertical handover. This paper tells us how to minimize the vertical handover. In this work we have done the basic changes while performing the selection of base station.Keywords: Wimax, Wifi, Cluster, Cluster Head, Handoff Mechanism, Heterogeneous Networks. I.INTRODUCTIONNext-generation wireless networks have been envisioned as an Internet Protocol (IP) based infrastructure with the integration of various wireless access networks such as IEEE 802.11 wireless local area networks (WLANs), IEEE 802.16 wireless metropolitan area networks (WMANs), Wimax, Wi-Fi networks and Universal Mobile Telecommunications System (UMTS). Heterogeneous wireless networks should be made in a such a way that it should provide users an ubiquitous environment with seamless mobility and good quality of service (QoS). Mobile nodes (MNs) can automatically switch the connectivity between different types of networks. The interworking between different wireless access networks has been an important research topic in the past few years. Different radio access technologies present distinct characteristics in terms of mobility management, security support, and QoS providing. For getting flawless mobility and end-to-end QoS guarantee for the users, these problems should be carefully taken care off while developing the interworking and handoff schemes of WMNs with various wireless networks. Mesh routers in the WMNs play an important role. The 802.11 access point (AP) functions and 802.16 base station (BS) functions can be integrated into one mesh router. In case the MN switches the network interface, only the type of link is different between the MN and mesh routers, and the MN still connects to the same mesh router. In this case, the traditional mobility management such as Mobile IP leads to a large handoff delay with too much signalling cost. Thus to achieve fast and seamless handoff, a new handoff scheme should be considered. Another factor which can effortlessly choose vertical handoff is how and when to make a handoff decision. In traditional h...
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