In this paper, two learning automata based adaptive limited fractional guard channel algorithms for cellular mobile networks are proposed. These algorithms try to minimize the blocking probability of new calls subject to the constraint on the dropping probability of the handoff calls. To evaluate the proposed algorithms, computer simulation are conducted. The simulation results show that the pe...

−In future wireless broadband networks, bandwidth demands could fluctuate abruptly due to movement of high data rate users. Dynamic bandwidth reservation plays a key role in ensuring that mobile calls are not disrupted after they are admitted into the network. We propose a dynamic guard bandwidth scheme that adapts the amount of guard bandwidth in both wired and wireless links according to real...

Due to the popularity of the IEEE 802.11-based LANs and fast development of the IEEE 802.16e MANs, we can expect a heterogeneous network consisting of 802.11-based and 802.16e networks in the near future. In such an environment, heterogeneous handoff is possible. How to keep guaranteeing the handoff connection its QoS demand, and in the meantime, avoid impacting on other connections is a challe...

We consider new channel assignment schemes with hysteresis mechanism, suitable to be used in cellular mobile networks. Two types of calls arrive to the base station of each cell. Stream 1 (of high priority) arrivals are those calls in progress that were originated in another cell and are handed over to our cell (handoff attempts). Stream 2, arrivals of low priority, are those calls originated i...

This paper presents a channel preemption model for vertical handoff in heterogeneous WLAN (wireless LAN) embedded cellular networks. The novelty of this paper is right in that a newly initiated mobile node (MN) outside the WLAN coverage can preempt the channels occupied by an MN inside the WLAN coverage when the cellular channels are completely used up. The channel preempted MN is forced to swi...

This letter presents a Dynamic Channel Management Scheme (DCMS), using both an One-Layer Cellular Architecture (OLCA) and a Two-Layer Cellular Architecture (TLCA), for use in areas with random offered traffic load. The philosophy of DCMS is that is based either on OLCA or TLCA proposed to the optimization of the handoff blocking probability performance of High-Speed Moving Terminals (HSMT) and ...

In cellular networks, call admission control (CAC) has a direct impact on quality of service(QoS) for individual connections which in turn affects overall system efficiency. Traditional reservation based schemes are not efficient for handoff rates, as the reserved bandwidth may not be utilized effectively in low hand-off rates. Therefore, we propose channel borrowing approach in which new calls...

This article proposes an integrated framework for adaptive QoS provision in IEEE 802.16e broadband wireless access networks based on cross-layer design. On one hand, an efficient admission control (AC) algorithm is proposed along with a semi-reservation scheme to guarantee the connection-level QoS. First, to guarantee the service continuity for handoff connections and resource efficiency, our s...

The article presents a dynamic connection admission control (CAC) and bandwidth reservation (BR) scheme for IEEE 802.16e Broadband Wireless Access networks to simultaneously improve the utilization efficiency of network resources and guarantee QoS for admitted connections. The proposed CAC algorithm dynamically determines the admission criteria according to network loads and adopts an adaptive ...

A novel bandwidth allocation strategy and a connection admission control technique are proposed to improve the utilization of network resource and provide the network with better quality of service (QoS) guarantees in multimedia low earth orbit (LEO) satellite networks. Our connection admission control scheme, we call the probability based dynamic channel reservation strategy (PDR), dynamically...