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Wireless mobile multimedia communications are being greatly increased in the number of users, diversity of applications and interface technologies. Future mobile based Internet will accommodate various wireless technologies and also will need to provide sufficient end-to-end QoS (Quality of Service) mechanism to provide enhanced user's satisfaction. In this paper, we propose a new adaptive end-to-end...
This paper discusses the efficient message deletion mechanism, which will be able to apply regardless of applied routing protocol, in DTNs (Delay Tolerant Networks). In order to achieve an acceptable quality of message delivery probability, we will need to allow the multiple message replicas in the system. In this context, the capability and capacity of store-carry-and-forward at the nodes is crucial...
Mobile network has been tremendously increased in the number of users, diversity of applications and of interface technologies. Also mobile network need to provide sufficient adaptive End-to-End QoS management mechanism to provide enhanced user satisfaction. In this paper, we propose a new adaptive End-to-End QoS management mechanism based on the concept of utility function which we have borrowed...
Resource allocation is an important topic in wireless networks with inappropriate resource allocation causing congestion and unfairness to users. In this paper, a novel QoS-aware scheme is proposed for resource allocation in wireless ad hoc networks based on virtual price. Moreover, an iterative algorithm is proposed to achieve the optimal rates for a set of multipath sessions, resulting in maximizing...
In this paper we study the problem of subframe, subchannel and power allocation in OFDMA-based multihop relay networks. The system consists of a base station (BS), a number of relay stations (RS) and mobile stations (MS). We consider frame by frame scheduling, where the frame is divided into two subframes such as BS-RS and RS-MS subframes. We study two different problems, satisfying link rate requirements...
Due to the highly-varying wireless channels, deterministic quality of service (QoS) is usually difficult to guarantee for real-time multi-layer video transmissions in wireless networks. Consequently, statistical QoS guarantees have become an important alternative in supporting real-time video transmissions. In this paper, we propose an efficient framework to model the statistical delay QoS guarantees,...
This paper proposes a novel radio resource management scheme in the link adaptive WiMAX network and the hierarchical priority-queuing with weighted round-robin (HPWRR) scheduling algorithm for different traffic services. The radio resource management scheme can re-assign the burst profile and dynamically adjust the allocated bandwidth to the SSs to improve the resource utilization. Then, the HPWRR...
In wireless networks, providing a fair bandwidth allocation without too much reducing the system throughput is very challenging. Path loss attenuations induce unequal spectral efficiencies and in terms unequal throughtput for mobiles with different geographical positions. In the litterature, Proportional Fair (PF) is acknowledged as the reference scheduler in multiuser OFDM wireless networks. Opportunistically...
The access network has remained the bottleneck in efforts to deliver bandwidth intensive new-generation applications and services to subscribers. In the wired access network, GEPON is a promising technology for relieving this bottleneck while GEPON's counterpart in wireless access networks, is WiMAX. A converged quadruplet-services (video, voice, data and mobility) enabled network, which takes full...
There are many fields at where ad hoc networks are used, but applications like mission critical and commercial production or broadcasting which mostly contain real time audio and video streams and require absolute end to end guarantee for QoS. The key attribute these applications for guarantying for QoS is, they need routing path for connectivity like virtual leased line that is very difficult in...
Multimedia and real-time applications require bandwidth guarantees, which may be achieved by resource reservation. However, resource reservation in ad-hoc networks is a very challenging task due to the instability of radio channels, nodes mobility and lack of coordination between mobile nodes. Previously proposed reservation MAC protocols like CATA, FPRP and R-CSMA have limitations. They consider...
In the emerging wireless Internet environment involving m-commerce and other mobile applications, an increasing number of users are likely to adopt mobile transactions. These transactions may have very diverse requirements and some of them may require a significant amount of network resources and/or bounded delays. One of many unique characteristics of transactions involving a financial value is the...
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