The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this study, the authors propose a user association scheme with quality of service support for load balancing in heterogeneous cellular networks (HCNs), which jointly considers user's achievable rate and load level of each BS instead of only utilising the former. To reveal how HCNs should self-organise, the authors formulate it as a network-wide weighted utility maximisation problem. Note that the...
Providing desired quality of service (QoS) in cellular wireless networks is a challenging problem which is further magnified when considering more than one class of calls. In this paper, a novel adaptive call admission control (CAC) scheme is prposed for two classes of calls for a cellular wireless network consisting of two cells. The proposed scheme accepts a new call if it can guarantee, with a...
In this paper, we investigate the effects of pricing incentives in order to control the number of users requested access in cellular system. The system has been modeled as continuous time Markov chains with Poisson traffic for both new and handover calls. With mathematical results, formulations have been derived to show the values of new call blocking probability, probability of new calls are given...
In the next generation cellular communication environment, the effective delivery of multimedia traffic will become an increasingly important issue. In multimedia cellular networks, we should not only minimize handoff dropping probability, but also control new call blocking probability and utilize bandwidth efficiently. In this paper, a novel preemptive time-threshold based bandwidth allocation scheme(PTTS)...
With the popularization of mobile wireless networks in recent year, we can expect that the future mobile communication environments will be constructed from networks of different coverages and characteristics. The integration of WiMAX and femtocell technologies seems to be a feasible option for better and cheaper wireless coverage extension. It is well-known that WiMAX femtocells are currently under...
In the modern world, people need to communicate with each other and have access to information, regardless of their locations. Wireless networks are known to be the prominent solution for the always best connected networking. On the other hand, people expect to communicate with each other, with acceptable quality. Therefore, researchers and service providers try to improve the QoS of wireless networking...
In a heterogeneous wireless network, where many different wireless networks interwork together, call admission control is an important issue to distribute user traffic among different access networks in order to provide quality of service (QoS). In this paper, we present and analyze the performance of a call admission control (CAC) policy for voice and data calls, which is based on one-hop cooperation...
CAC is one of the most important parts of resource management in wireless cellular networks to keep the system work stable by accepting or rejecting users' service requests. A call admission control(CAC) algorithm(DQ-CAC) based on unfair quality of service(QoS) degradation and queue buffers in wireless mobile networks is proposed. The handoff call dropping probability(CDP) for the high priority, call...
In this paper, we propose a scheme for improved performance of resource reservation and call admission control for cellular networks called Predictive User Mobility Behavior (PUMB) scheme. This algorithm is proposed in which bandwidth is allocated more efficiently to neighboring cells by key mobility parameters in order to provide Quality of Service (QoS) guarantees for transferring traffic. The cell...
A network measurement and feedback scheme (MFS) for call admission control channel and resources predictive control in cellular networks is presented in the paper. MFS enhances the wireless resource utilization rate in cellular networks. Compared with normalized resource reservation schemes, MFS reduces the call dropping probability (CDP) and call blocking probability (CBP). Moreover, considering...
This paper presents a new model of call admission control which consists of a few elements for protecting the network in different conditions of workload in a manner that, calls blocking /dropping are kept under desired level. This model consists of two traffic classes of voice and data. In order to give a priority to handoff call over new call, some parameters in this model are adjusted in a manner...
Call admission control schemes play more important role in wireless cellular networks. They are used for achieving some desired quality of service parameters. An important challenge in these schemes is defining some realistic assumptions such as different channel holding times for new and handoff calls. In this paper we will introduce a new call admission control scheme based on the concepts of new...
A new variable bandwidth scheme (VBS) for channel resources predictive control and call admission control in cellular networks is presented in the paper. VBS mainly aims to the QoS enhancement of cellular networks. Compared with the time-based channel predictive control (TCPC) schemes, VBS has a good performance in call dropping probability (CDP) and call blocking probability (CBP). Moreover, considering...
The concept of Logical Service Provision Number (LSPN) is proposed to evaluate the service provision capacity in multicast and unicast integrated multiclass service cellular networks. The tradeoff between call blocking probability and LSPN is investigated and an objective function of maximizing LSPN is proposed. To solve the optimal problem, the system is modeled as a 2K-dimensional Markov process...
The handoff prioritization schemes in channel allocation are often carefully scheduled for it is more serious to drop an ongoing call than blocking a new call. In order to let the number of reserved channel for handoff prioritization be compatible with the real time handoff traffic variation in a cluster and seek the balance between the new call blocking probability and the handoff failure probability...
Low Earth orbit (LEO) satellite networks will work as an important component of the future telecommunications system. Multi-spot-beam antennas on satellites will allow a cellular coverage all over the Earth. However, the high speed of a mobile satellite may give rise to a large number of inter-beam and inter-satellite handovers during a call lifetime. In this paper, the author proposed a threshold-based...
One of the key challenges in multi-services wireless cellular networks is the design of effective call admission control (CAC) algorithm, which not only has to ensure that the system guarantees potentially different QoS requirements from diverse applications, but also fully utilizes the scarce wireless bandwidth. On the uplink of a CDMA cellular network, successive interference cancellation (SIC)...
Enhancing the total system performance along with supporting a large number of users is the challenge of cellular service providers. Code division multiple access (CDMA) system capacity as an interference limited capacity performance is mainly affected by the out of-cell interference. While the in-cell interference is controlled within each cell using power control algorithms, the out of -cell interference...
This paper proposes a novel adaptive time- threshold based bandwidth allocation scheme (ATTS) for voice handoff calls in cellular wireless networks. The proposed scheme overcomes the flaws of the fixed time-threshold based bandwidth allocation scheme (FTTS) in the total admitted traffic and the blocking probability of new calls. In proposed scheme, bandwidth threshold for non-prioritized handoff calls...
We propose a dynamic joint call admission control scheme for heterogeneous cellular networks. The objectives of the JCAC scheme are to uniformly distribute traffic load among available RATs, guarantee the QoS requirements of all accepted call, prioritize handoff calls over new calls, and keep handoff call dropping probability close to a target value. We develop a Markov chain model for the JCAC scheme...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.