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By employing a relay station (RS) on the WiMAX networks, it offers an extended coverage and improved capacity over wireless broadband. However the mobile station (MS) such that connected to the RS has effect the system performance due to increase of the MS numbers. In WiMAX the base station (BS) adopts the centralized-based polling mode where the best way to guarantee the delay bound is by polling...
Long Term Evolution-Advanced (LTE-A) is a new radio access technology that is expected to provide better experience among the mobile cellular users. It delivers multimedia services using packet switching technology. Therefore, intelligent design of packet scheduling for the LTE-A to provide Quality of Service (QoS) comparable to fixed line services becomes crucial. However, packet scheduling over...
Message Ferrying is a mobility assisted scheme in which a special node, called a message ferry, is tasked with delivering data among a set of disconnected wireless nodes. One key challenge for such scheme is to design the ferry route in a way that improves certain network characteristics such as average data delivery delay or data loss ratio. Previous work has optimized ferry travel time, rather than...
This paper presents new energy-aware QoS scheduling and call admission control algorithms for WiMAX IEEE 802.16e broadband wireless access standard. The scheduling algorithm works at MAC layer and is designed towards minimizing power consumption at mobile stations supporting multiple UGS connections, while meeting the QoS requirements of the connections. The scheduling algorithm uses a novel idea...
In this paper we are investigating the capacity of Mobile Ad Hoc Networks under a concurrent transmission constraint imposed by common MAC layer protocols (such as 802.11). This problem is known to be an NP-hard combinatorial problem and a greedy algorithm has been proposed for solving it in polynomial time. We propose an efficient algorithm for solving the exact problem and compare the exact and...
IEEE 802.11 specifies a Power Saving Mode (PSM) in order to save the energy consumptions of mobile hosts. Following the standard of PSM, a number of studies [1–4] further discussed the wakeup/sleep scheduling of beacon intervals based on Quorum systems so that any communication pair of hosts has common awake intervals for data exchange. However, most of them did not take into consideration the fact...
Vehicular Delay-Tolerant Networks (VDTNs) are a disruptive network architecture based on delay-tolerant network paradigm, gathering contributions from opportunistic and cooperative networks, and optical burst switching paradigm. VDTNs assume out-of-band signaling and handle non-real time applications with a low cost network infrastructure. In VDTNs, vehicles are opportunistically exploited to carry...
The last decade has shown a rapid growth in wireless communication technologies. Wireless Mesh Networks (WMNs) appear to be a promising evolution of traditional wireless communications. WMNs are involved to support a variety of services and traffic types. Real time applications like Voice over Internet Protocol (VoIP) require a strict Quality of Services (QoS) such as low end-to-end delay, low drop...
Scheduling algorithms are essential in guaranteeing Quality of Service (QoS) provisioning. Through QoS guarantee, a network application could obtain services which fulfil its specific requirements such as less delay, reduction in loss rate and higher throughput. However, due to dynamic nature of mobile ad-hoc networks (MANETs) which results to frequently changing topology and link breaks, the design...
The paper deals with a modified version of opportunistic scheduling algorithm that exploits multiuser diversity. It incorporates the proportional fairness scheduling policy with the first-in-first-out (FIFO) policy to obtain a hybrid policy that works well when the channel state information of each mobile user is not necessarily known. In the paper, it is proposed that the channel state information...
We consider wireless femtocell networks where scheduling of transmissions is coordinated across multiple cells to mitigate interference and deliver fairness and quality of service (QoS). Coordination across multiple cells entails (i) exchange of (serving and interfering) channel information and traffic priority (which is a function of packet delays, average rate, queue length), and (ii) signalling...
We study systems of static and mobile sensors in which the participating nodes are disconnected. At any given time, only selected groups of nodes are able to interact. In this paper, we restrict attention to pairwise interactions of static nodes placed on a regular grid. Nodes must agree on a schedule that specifies when and in what order these interactions take place. Our focus is the impact this...
The traffic characteristics in recent years have changed considerably having more video and audio traffic with critical real-time constraints. This situation is compounded by the increased number of mobile nodes communicating over Internet. Due to such high data traffic, the access routers are often overloaded with packets with different priority. The access routers have to act quickly enough to avoid...
CBTC (Communication Based Train Control) will be based on mobile communication, which the key problem is how to support reliability of control data transmission to improve track utilization and enhance train safety. This paper proposed a kind of real-time transmission model for high speed train end-to-end control data operation, which based on circuit switched data service by traditional wireless...
This paper proposes a slot-based persistent allocation scheme which allows WiMAX base stations (BSs) allocating resources to VoIP-like traffic in an efficient way. The proposed scheme firstly scans resource slots within the stream of data frames to identify an available resource slot for a persistent resource allocation. To facilitate the scanning process, the base station maintains a tree structure...
A mobile terminal equipped with multiple network interfaces can often be found under coverage of multiple access networks. Multihoming enables mobile terminals to communicate simultaneously through multiple interfaces. Connection-oriented transport layer mechanisms ensure reliable, in-order delivery of data, however parallel data transfers in multihoming face problems due to out-of-order reception...
The mobility issue in grid environments has established new challenges to the research communities particularly in the areas of scheduling, adaptation, security and mobility. Especially, the resource allocation becomes more challenging when mobility is considered in grid environment. Hence it is necessary to consider the mobility of users along with the resource availability while scheduling the resources...
In this paper, we have presented an opportunistic multi-server scheduling scheme that distributes traffic on multiple wireless interfaces of a mobile router to improve service guarantees for competing flows during mobility. The proposed adaptive, scalable, multi-server (ASM) scheduling scheme extends guaranteed-rate(GR) service model to ensure bounded service delays for each packet of flows in accordance...
This paper presents one inner-cluster scheduling algorithm, avoiding mobile nodes' location affect, satisfying expected coverage scale and high-effect. This excludes the number of smallest inner-cluster active nodes k, which can satisfy expected coverage scale in monitored area, according to coverage analysis theory. In inner-cluster, we only select k nodes with higher energy and nearer close to fixed...
Recently several P2P-based mobile media distribution systems including MOVi (Mobile Opportunistic Video on demand) are proposed as a complimentary solution for mobile VoD services. In this paper, we propose a three-step segment-based scheduling algorithm incorporating the notion of ORC (Opportunistic Regional Clusters) for mobile media distribution. By intelligently designing a centralized scheduling...
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