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In order to transmit multi-constrained QoS multimedia flows with large scale data and information, such as image, voice and video etc., multi-constrained QoS path selection is a big challenge and a key problem need to be resolved urgently for WMSN. In this paper a novel multi-constrained QoS path selection scheme based on enhanced simulated annealing is proposed and a more refined cooling schedule...
Multicast services are used in emerging multimedia applications based on Quality of Service (QoS) development of multimedia group application and the construction of multicast routing tree is significant. Upper bound on the delay between sender and receiver is one of the common QoS constraints. Delay-constrained routing protocols are used to find paths subject to the delay constraint while efficiently...
The hybrid networks of WLAN and WMAN can provide high data rate and enhanced multimedia services, but there are many challenges to obtain handover decision based dynamic QoS information. IEEE 802.21 aims at providing a framework that defines media independent handover (MIH) mechanism that supports seamless handover across hetero geneous networks. In this paper, we propose a new approach network selection...
The QoS properties of the provided services based on SOA play a significant role in service composition. However in the domain of multimedia service, making the provision of services QoS-aware is still a challenging work. In this paper we present a generic QoS model of service composition, as well as an algorithm to the QoS-aware service problem. The proposed algorithm is designed and implemented...
Multicast routing in multirate mesh network wireless networks is challenging, mainly due to multirate transmissions and quality of services guarantee. In this paper, we present a self-learning multicast routing algorithm for multirate WiFi (Wireless Fidelity) mesh network. First, we design a self predict routing information mechanism to predict the delay and bandwidth of every multicast tree. The...
With the amount of available multimedia data increasing world-wide and with the expanding need for rapid access to this data, efficient data delivery has become a significant problem for which no fully satisfactory solutions have been provided, yet. A major issue is the concurrent usage of the same bottleneck network resources by multiple communication flows. In the case of multimedia streams, which...
The problem of computing the bandwidth-delay-constrained least-cost QoS multicast routing is a NP-complete problem. A novel shuffled frog leaping (SFL) algorithm is proposed to deal with the Qos multicast routing problem effectively and efficiently in this paper. The experimental results show that the proposed algorithm can find optimal solution quickly and has a good scalability.
Fairness and QoS have been main concerns in designing modern routers or switches in multimedia environment. This paper proposes a new packet-based fair queuing algorithm for packet switches called VISTA (Virtual Clock with Virtual Start Time Alignment) to improve fairness in existing VC (Virtual Clock) algorithm. A novel concept of virtual start time alignment is introduced to improve fairness of...
The WiMAX technology based on IEEE 802.16 is expected to support multimedia services with guaranteed quality of service (QoS). In this paper, a scheduler structure with priority classes is designed for IEEE 802.16 wireless networks, and a channel quality dependent rate-limited (CD-RL) algorithm is proposed. CD-RL provides promised data rates while taking throughput into account. With a carefully designed...
The QoS routing problem of wireless multimedia sensor networks has great challenging. A notion using routing game and ant colony algorithm to solve this problem is proposed in this paper. A mixed strategy routing game model is proposed too, and proves the routing game has Nash equilibrium. In the routing game, we used the probabilities which are calculated on the basis of the pheromone trails left...
The performance of a computer network is mostly affected by heavy traffic. The upcoming networks are more sensitive to time. Especially in multimedia networks, time is an important factor. So, efficient mechanisms are needed to improve the performance of the network. Connectionless network uses multiple paths to send the packets and achieves higher bandwidth. But, Connection-oriented network uses...
The use of wireless networks has spread further than simple data transfer to delay sensitive and loss tolerant multimedia applications. The IEEE 802.11 WLAN has become a dominating technology due to its low cost and ease of implementation. This paper presents across-layer mapping algorithm to improve the quality of transmission of H.264 (a recently-developed video coding standard of the ITU-T video...
In modern satellite communication systems, because of the high efficiency and flexibility, MF-TDMA becomes one of hot issues. The resource-allocation can be described as optimal location problem in the MF-TDMA channel structure (MTCS). The effective timeslot management is the guarantee of the efficiency of resource management in MF-TDMA system. This paper discusses the timeslot allocation problem...
As currently specified by 3GPP, MBMS (multimedia broadcast multicast service) content can be provided in a cell by either point-to-point (P-t-P) or point-to-multipoint (P-t-M) transmission mode, but not both at the same time. In earlier work we highlighted the deficiencies of the current approach and proposed the concept of the ldquodual transmission mode cellrdquo, in which P-t-P (DCH) and P-t-M...
Handover Control is one of the essential means to guarantee the continuity of mobile services to a user traveling in a cellular infrastructure, without interruption. In previous work we illustrated that using the current 3GPP specified handover control algorithm to provide continuity of MBMS (Multimedia Broadcast Multicast Service) services to a user crossing cell boundaries results either in capacity...
Multimedia broadcast and multicast service (MBMS) specification was introduced in the release 6 of the 3GPP standard to deliver multimedia content to a large group of users in the UMTS network. With the MBMS system generally the same content is transmitted to multiple users in a unidirectional fashion, typically by multiple base stations to improve the coverage over a large geographical area. From...
This paper presents an efficient multicast routing algorithm called DNMA. According to our simulation results, the proposed algorithm outperforms some existing well-known approaches for solving QoS of multicast routing problem in large scale networks.
In wireless communications networks with multiple service classes (SCs) of calls, call admission control (CAC) schemes is an essential radio resource management (RRM) function for networks consistency. Apart from the calculation of the call blocking probability (CBP) appropriate criteria and metrics should be considered to evaluate the efficiency of various schemes. Fairness among different services...
Multimedia over IP (MOIP) is one of IP-based realtime communication that has been gaining popularity in recent years. Quality-of-service (QoS) is still one of the major challenges in real-time communication over IP networks. Excessive delay severely impairs communication interactivity, while packet loss results in glitches in audio and poor picture quality and frozen frames in video. In this paper,...
MBMS bearer services can be provided in each cell by either point-to-point or point-to-multipoint transmission mode but for efficiency a decision has to be made between the two approaches. Initially, the fundamental criterion used to make this decision was the number of MBMS users in a cell (UE counting). In this paper we extend our previous work, which proposed the power transmitted by the base station...
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