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An effective Ant-Colony based routing algorithm for mobile ad-hoc network is proposed in this paper. In this routing scheme, each path is marked by pathgrade, which is calculated from the combination of multiple constrained QoS parameters such as the time delay, packet loss rate and bandwidth, etc. packet routing is decided by the path grade and the queue buffer length of the node. The advantage...
It is well known that providing reasonable resource allocation schemes during the handoff execution phase can improve the handoff performance of broadband wireless access (BWA) system. In this paper, to improve the handoff performance from a different aspect and provide differentiated handoff QoS, we propose a handoff initiation threshold algorithm supporting multi-services. Our study indicates that...
In this paper we introduce an effective bandwidth- based Call Admission Control (CAC) with adaptive modulation technique to manage the traffic in a wireless IP-based network. Since the next generation of communication networks will carry different classes of traffic, e.g., voice, video, fax, data and multimedia, over the same network and these different classes of traffic usually require different...
In a wireless network, concurrent communications between a node and multiple neighboring nodes through the use of multibeam antenna (MBA) has been shown effective to utilize the spatial dimensionality. As a result, the network throughput and quality-of-service (QoS) can be improved. MBAs can be implemented using multiple fixed-beam antennas (MFBAs) or multi-channel smart antennas (MCSAs). In this...
Digital Radio Mondiale (DRM) is a new digital radio broadcasting system for the frequency bands below 30 MHz. it adapts to be implemented in single frequency network (SFN) :a transmitter network in which all transmitters broadcast identical information simultaneously at the same frequency. SFN simulation result is presented in this article, and an implementing method of SFN based on DRM is proposed...
Current day telecommunication services are hybrid in nature and involve diverse technologies such as voice, video, or email. Emerging technologies like Personal Area Networks (PAN), Sensor Networks (SN) and machine- to-machine communication further contribute to this hybrid nature and will most likely provide a promising avenue for telecommunication service providers and operators to present novel...
IPTV technology is still faced with such concerns in its quality of service as channel switch delay. One way among many that are devised to reduce this delay is multi-channel synchronous delivery. However, the bandwidth efficiency of this method is low. We propose a finite duration method in this paper and build up mathematical models to describe user behaviors like channel surfing to evaluate the...
Considering the high packet losses ,low bandwidth of GPRS/EDGE network and heterogeneity of mobile clients, we present and implement HandVoD: a robust and scalable VoD solution with raptor codes for hand-held devices, like PDAs, smartphones, over GPRS/EDGE network. It's capable of providing 3GPP compliant end-to-end QoS support for each individual client with enhanced RTSP, RTCP, RTP protocols, priority_based...
Voice over Internet Protocol (VoIP) is an important service with strict quality-of-service (QoS) requirements in wireless local area networks (WLANs). The popular distributed coordination function (DCF) of IEEE 802.11 medium access control (MAC) protocol adopts a binary exponential back-off (BEB) procedure to reduce the packet collision probability in WLANs. In DCF, the size of contention window is...
The next generation networks are designed to provide ubiquitous access networks to mobile users. Users may require various data rates and quality of service (QoS) in different places. The integrating of wireless cellular network and wireless local area network (WLAN) can take full advantage of each other, and provides consumers with much more comprehensive wireless service. In this paper, a novel...
IEEE 802.16 standards have been developed as one of the technical solutions for broadband wireless access systems. It has high data rate, large network coverage, flexible QoS schemes and cheap network deployment. Various flexible mechanisms related to QoS provisioning have been specified for uplink traffic at the medium access control (MAC) layer in the standards. Among the mechanisms, contention...
Wireless mesh infrastructure provides for attractive solutions to telecommunication services, where larger network capacity for broadband wireless Internet may be realized by spatial spectrum re-use, and lower network costs may be realized by the saving of cable/fiber backhaul on wireless stations. However, state-of-the-art technologies suffer from scalability limitations, where dataflow quality of...
A cross layer scheme of resource allocation is proposed for the delay sensitive service in OFDMA wireless system. The minimal and maximal rates of users are given according to the delay threshold of the service and queue state info at MAC. The minimal rate guarantees the quality of service and fairness of users, whereas the maximal rate increases the resource usage efficiency. With these rate constraints,...
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