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This paper investigates the problem of network selection in access control for heterogeneous networks of WCDMA/WLAN. To optimize the network selection decision policy, an optimization equation is defined with the objective of maximizing the total rewards, and then a new Q-learning Based Network Selection (QBNS) mechanism is proposed to solve the equation. In the QBNS Algorithm, Q-learning algorithm...
In the presence of heterogeneous service provider (SP) networks such as wireless local area networks and cellular networks, users have to make a choice. The quality of service provided and the price charged by an SP play a crucial role in this decision process. In this paper, we study the network selection behavior of mobile users. A novel probabilistic framework is presented, with explicit analytical...
In this paper, we propose a multi-factors cell selection (MFCS) scheme for heterogeneous networks with multimedia traffic. In heterogeneous networks, it is an important issue to determine a suitable access network for call request to support seamless service and high-speed connectivity. The MFCS scheme first chooses candidate cells for call request to satisfy the received signal strength constraint,...
In recent years, IEEE 802.11 Wireless Local Area Networks (WLANs) have emerged as one of the prevailing technologies for the broadband wireless access. Although IEEE802.16 wireless network has become a newer generation of wireless network, it will be used as wireless metropolitan area network in the beginning because of its price. IEEE 802.11 network will continue to be the most important wireless...
WiMAX-WLAN gateway (WWG) in heterogeneous WiMAX networks were configured to aggregate and route traffic from WiMAX and WLAN mobile stations (MSs) that is out of coverage with base station (BS) and access point, respectively. However, previous studies on bandwidth request (BR) mechanism at WWG are carried out using either polling or bandwidth reservation for best effort (BE) services. These studies...
In late years, the demand for multimedia communication has been raised extensively. In this environment, to guarantee the QoS is extremely importantï¼ While various control mechanisms have already been realized about the QoS control in each protocol layer, a QoS-guaranteed TCP (QoS-TCP) has been proposed. The QoS-TCP tries to guarantee a specified bandwidth against competing background TCP traffic...
There are real challenges in both the IEEE 802.11 wireless local area network (WLAN) protocol and the medium access control (MAC)-functions providing the required quality-of-service, high throughput and minimum latencies. The IEEE 802.11 layer supports both the distributed coordination function (DCF) and the enhanced DCF (EDCF). The different access categories (AC) within the EDCF can enhance the...
Lunar surface networks are critical to a manned mission to the Moon, but encounter many challenges including lack of infrastructure, shortage of power, long distance communications, and quality of service (QoS) support. These challenges demand both power efficient and reliable networking protocols. In this paper a power efficient and reliable MAC protocol is proposed based on commercial IEEE 802.11...
Signaling control schemes for wireless multimedia services are expected to maximize the number of newly-accepted mobile terminals (MTs), i.e., system throughput, while maintaining the quality of service (QoS) requirements for the existing MTs in the system. In this paper, we propose a γ-percent time-bound signaling control (γ-TBSC) scheme that resolves a maximum number of MTs mostly within a given...
This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control mechanism for multimedia traffic that exploits vertical handoff as an effective tool to enhance radio resource management while guaranteeing handoff user's QoS requirements. The network resources utilized by the vertical handoff...
In VoIP over WLAN (known as VoWLAN) transmission, one of the main problems is that the supported voice channel capacity is relatively low. As an improvement to IEEE 802.11 MAC layer Carrier Sense Multi-Access/Collision Avoidance (CSMA/CA) algorithm, this paper presents Prediction/Collision Avoidance (P/CA) mechanism based on service attribute and cross-layer control. Under this mechanism, there is...
This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control scheme for multimedia traffic that exploits vertical handoffs as an effective tool to enhance radio resource management while guaranteeing handoff users' QoS requirements. The network resources utilized by the vertical handoff...
Despite being robust and efficient within a small Wireless Local Area Network (WLAN), the CSMA/CA fails to satisfy the QoS requirements for many users in large networks due to a set of known shortcomings. For example, IEEE 802.11 WLANs present a MAC anomaly when users in the same Basic Service Set (BSS) employ different transmission rates. This paper addresses the performance anomaly in such a network...
This paper proposes a preference value-based cell selection (PVCS) scheme to satisfy quality of service (QoS) requirements, maximize accommodated number of calls, and minimize handoff occurrence frequency in heterogeneous wireless networks. The PVCS scheme contains three stages including candidate cells selection, preference value calculation, and target cell determination. The candidate cells selection...
The next generation wireless network is expected to be a heterogeneous. The Radio Access Technology (RAT) selection algorithm, including initial RAT selection and vertical handover, is one of the key research areas in Common Radio Resource Management (CRRM). A suitable RAT selection algorithm can maximize the system performance and Quality of Service (QoS) by allocating users to the most suitable...
With the increasing variety of multimedia applications, it is needed to develop a mechanism for the quality of service (QoS) to support different types of traffic. IEEE 802.11e EDCF is a new wireless technology which is an enhanced version of DCF. There have been many performance studies of IEEE 802.11e EDCF and proposed an accurate Markov chain model to depict the IEEE 802.11e EDCF characteristics...
Next generation wireless communications will likely rely on integrated networks using efficient multiple wireless technologies. When an MS scans several neighboring APs in a hotspot area, it takes more time. Also, selecting a target AP causes a long delay and has packet loss problems. We propose a scanning algorithm to reduce ETE delay, which defines the maximum scanning interval consisting of the...
This paper presents a blueprint for proactive context-aware mobility support architecture for heterogeneous access networks called PRONET. In particular, we leverage upon the principles of cognitive networking to support proactive context-awareness for user-centric application adaptation via quality-of-experience (QoE) provisioning. Our proposed architecture is built upon port-based multi-homed mobile...
This paper proposes TD-uCSMA a synchronous distributed coordination function which is meant to provide CSMA/CA with a mechanism for QoS provisioning and bandwidth management over WiFi networks. TD-uCSMA relies on synchronization among nodes and the time-driven switching of contention parameters inside nodes. The TD-uCSMA operating principles and preliminary synchronization issues are presented here...
The most widely deployed wireless networking standard, 802.11, grants access of the wireless channel to contending stations (STAs) through the Carrier Sense Multiple Access/ Collision avoidance (CSMA/CA) mechanism. This approach in general is not scalable, is biased against the network's access point (AP), and does not satisfy the quality-of-service (QoS) requirements of different flow types. These...
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