Joint call admission control (JCAC) can significantly improve connection-level quality of service (QoS) in heterogeneous wireless networks. This paper proposes serviceclass-based JCAC and adaptive bandwidth management scheme to enhance connection-level QoS in heterogeneous cellular networks, where each cellular network is optimized to support specific classes of service. We develop an analytica...

In cellular networks, blocking occurs when a base station has no free channel to allocate to a mobile user. One distinguishes between two kinds of blocking , the rst is called new call blocking and refers to blocking of new calls, the second is called handoo blocking and refers to blocking of ongoing calls due to the mobility of the users. In this paper, we rst provide explicit analytic express...

In this paper, we present an analytical model to study the soft handoff coverage by evaluating the new call blocking and the handoff call dropping probabilities in a cellular CDMA system. By assuming that the new call generation rate per unit area is uniformly distributed over the service area, enlarging the soft handoff region may increase both the blocking and the dropping probabilities. On t...

We consider the problem of stable matching with dynamic preference lists. At each time step, the preference list of some player may change by swapping random adjacent members. The goal of a central agency (algorithm) is to maintain an approximately stable matching (in terms of number of blocking pairs) at all times. The changes in the preference lists are not reported to the algorithm, but must...

Several previous contributions have proposed calculation methods that can be used to determine the steady state (and from it the blocking probabilities) of Code Division Multiple Access (CDMA) systems. This present work extends the classical Kaufman-Roberts formula such that it becomes applicable in CDMA systems in which elastic services with state dependent instantaneous bit rate and average b...

In this paper, we consider the call admission problem in cellular networks that support several classes of calls. In the first part of this paper, we first introduce a multi-threshold guard channel policy and study its limiting behavior under the stationary traffic. Then we give an algorithm for finding the optimal number of guard channels that minimizes the blocking probability of calls with l...

Among satellite systems, low earth orbit (LEO) satellite system will make an important role in new fiture communication services, because of its less propagation delay, less power consumption in the user terminal and the satellites, and efficient spectrum utilization using smaller coverage area for each satellite than geostationa y (GEO) counterpart. However, a number of mobility problems that ...

Data replica placement is an important issue in the cloud storage system, which includes two key points: how to determine the replica factor and how to select optimal Datanode to store replica. With the provision of file store service and file access service for large scale users, the Datanode in cloud storage system is regarded as services site. According to the basic principle of queuing theo...

In this paper we propose a new architectural switching nodes consisting of two processing nodes that follow Erlang B and Erlang C traffic respectively. The developed model is used to best utilize the given number of output channels to achieve the least blocking probability. An appropriate mathematical model has been further devised and its call blocking probability has been enunciated. Performa...