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Wireless networks are required to guarantee the Quality of Service (QoS), including throughput, fairness, delay, etc. IEEE802.11 MAC protocol employs a typical backoff mechanism, Binary Exponential Backoff (BEB) algorithm, to avoid collisions when multiple users try to access the shared wireless channel. Many works on QoS guaranteeing point out that the BEB algorithm introduces the unfairness and...
Disaster situations are a challenge for network operators because they result in an extraordinary large number of calls being opened simultaneously compared to normal operating conditions. The Quality of Service (QoS) and Quality of Experience (QoE) for the end user can be widely affected by peak loads and result in severe degradation, basically due to congestion on bottlenecks inside the network...
Multi-channel multi-radio wireless networks improve network performance by enabling more simultaneous transmissions. Among multi-channel multi-radio protocols, the hybrid multi-channel approach has been shown to be efficient in providing higher system throughput. Voice over internet protocol (VoIP) service is expected to be widely supported in wireless networks, though its capacity has not been studied...
QoS provisioning is an important issue in the deployment of broadband wireless access networks. The scheduling scheme is essential to guarantee the QoS requirements of different service classes. WiMAX Orthogonal Frequency Division Multiple Access (OFDMA) system specifies the Orthogonal Frequency Division Multiplexing (OFDM) symbol mapping in a rectangular shape manner. In this paper, we propose a...
Quality communication over the wireless channel is now promised because of the advent of the broadband wireless. High speed data access is expected to be provided to subscribers through broadband wireless access. We propose a joint Call Admission Control (CAC) and Bandwidth Allocation (BA) for an IEEE 802.16 based WiMAX system. The presented schemes aim to provide QoS support along with a fair resource...
In this paper, we exploit the geographic opportunistic routing (GOR) for QoS provisioning with both end-to-end reliability and delay constraints in wireless sensor networks (WSNs). Recent work exploits multipath routing to guarantee both reliability and delay QoS constraints in WSNs. However, the multipath routing approach suffers from a significant energy cost. We also find that existing GOR protocol...
Rich media application enables plenty of interactive, information-rich services to enhance end user's viewing experience. In current standards released for such service, only one rendering space is defined to handle multiple types of content belonging to the same service. However, a new trend is to assign more than one terminal device to render rich media application in a cooperative way inside a...
Previously, we studied the performance of transport layer multihoming (e.g., STCP). Using the emulated application of the bulk data transfer, we investigate existing overlay multicast schemes and find that all of them have a inherit performance limitation caused by tansport layer singlehoming (e.g., TCP). Based on this, we design a new overlay multicast architucture named the Hierarchy Overlay Multicast...
Several studies have found some properties of Internet such as Triangle Inequality Violations (TIVs). The studies have reported the existence of TIV in the Internet delay space. Triangle inequality violations that are important to peer-to-peer applications can be leveraged to build overlay routing to improve peer-to-peer performance. How to select relay nodes becomes a crucial factor to overlay routing...
802.11e HCCA (Hybrid coordination function Controlled Channel Access) exhibits good QoS provisioning for constant bit rate (CBR) video streams in a single collision domain. However, its performance degrades significantly for variable bit rate (VBR) video streams particularly in multi-collision domains. In addition, HCCA has the disadvantage of high complexity. In this paper, we introduce a deterministic...
Remote replication, also called remote mirror, is the key technology for data disaster tolerance. Compared with researchers, administrators of data center prefer to pay more attention to the influence factors of performance rather than how to implement remote replication and the technical details. In this paper, the influence factors to remote replication system are analyzed using a LVM-based remote...
The proportional service model has gained attention recently as an effective solution for quantitative service differentiation in IP networks for its controllable, consistent, and scalable features. A loss proportional differentiated service model is proposed in this paper and we have described the service in mathematical fashion. We analyze the parameters meanings of RED queue and put forward an...
With the ongoing progress of telecommunication has increased the want of mobility, wireless or mobile networks and this desire has already swapped the wired networks. The upcoming networks has totally different infrastructure and has different protocols and devices. These networks are infrastructure less and no dedicated protocols or devices are required to deploy such networks. The theme of this...
The performance of signaling protocols in circuit and packet switching networks is a significant parameter to evaluate the performance of any telecom operator. Today, users demand continuous high data rate, service availability, network reliability, mobility, QoS and minimum service initialization time. IP Multimedia Subsystem (IMS) standardized Session Initiation Protocol (SIP), which categorize...
The IEEE 802.16 standard defines MAC and Physical layers for broadband wireless networks called WiMAX, however, it does not define the scheduling algorithm for the uplink and downlink traffic. In this paper, a predictive scheduling algorithm for uplink traffic in IEEE 802.16 networks is proposed. The proposed algorithm uses the cross-layer approach and is applied on the queue of the bandwidth requests...
QoS provisioning is an important issue for deploying broadband wireless access networks with real-time and non-realtime traffic integration. Opportunistic MAC (OMAC) protocol combines cross-layer design and opportunistic scheduling scheme to achieve high utilization while providing QoS supports to various applications. In this paper, we propose a cross-layer MAC protocol and scheduling framework with...
With the rapid development of various types of space applications, space information network faces more and more challenges about the quality of service. How to provide end-to-end QoS based on the limited resources of space information network becomes one of the research focuses. In this paper, a method of dynamic deprivable bandwidth allocation (DDBA) is proposed for delay-sensitive specific applications...
In this paper, we analyze the impact of end-to-end (E2E) delay variation on stripped sessions, whose packets are distributed over multiple links of multi-mode mobile terminal (MMT). The results of this analysis signify the importance of minimized out-of-sequence (OOS) arrival of packets belonging to a stream, while traversing through multiple radio networks to reach their destination. We, then propose...
In this paper, we analyze the impact of end-to-end (E2E) delay variation on stripped sessions, whose packets are distributed over multiple links of multi-mode mobile terminal (MMT). The results of this analysis signify the importance of minimized out-of-sequence (OOS) arrival of packets belonging to a stream, while traversing through multiple radio networks to reach their destination. We, then propose...
This paper aims at providing different cost-efficient solutions for the channel impairments in tropical areas. In order to extend service to isolated areas, we propose an hybrid architecture based on DVB-S2/RCS + Wi-Fi networks. In this scenario, the delay of the ACM reaction to fade changes can affect the quality of the video transmission, especially because of the characteristics of tropical deep...
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