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The traditional client-server architecture widely adopted on the Internet is not adequate to meet the increasing user loads and bandwidth demands in live streaming systems especially for multimedia content delivery. Peer-to-peer P2P) overlay networks provide excellent system scalability and high resource utilization, which make it an attractive solution to this problem. This paper considers a hybrid...
Due to spectrum scarcity and emerging various wireless applications in IMT-Advanced system, spectrum allocation scheme becomes a recently critical issue. In this paper, we refer to the concepts of spectrum reservation and power reward, make use of maximum-minimum criteria, propose a cellbased distributed dynamic spectrum allocation (DSA) algorithm which combines the water filling power allocation...
In random broadcasting or dynamic broadcast, source packets that have to be broadcast to all the other nodes are generated at each node of a network or a parallel/distributed system at random instances or in an uncoordinated manner. In this paper, we propose a priority-based routing scheme, to be referred to as prioritized dominating-set broadcasting (PDB), for random broadcasting in k-ary n-cubes...
This paper considers a hybrid hierarchical P2P overlay network structure that consists of both super and normal peers. The media streaming architecture is built upon a tree-structured network of super peers and the tree construction process has a significant impact on the overall system performance. We build network cost models and formulate a specific type of problem to maximize the minimum node...
In order to improve transmission throughput of a multi-hop wireless network, many efforts have been made in recent years to reduce traffic and hence transmission collisions by constructing backbone networks with minimum size. However, many other important issues need to be considered. Instead of simply minimizing the number of backbone nodes or supporting some isolated network features, in this work,...
In this paper, we consider an optimal topology control problem that dynamically configures the path and capacity under the varying traffic load for constructing a multihop backbone network in the TDD-OFDMA system. In order to deal with the co-channel interference among the different relay stations, K orthogonal subzones of OFDMA data regions are spatially reused. We present a joint path and capacity...
This paper presents a new adaptive and dynamic routing algorithm called AAODV for mobile ad hoc networks inspired by Ant Colony Optimization algorithms. This algorithm is proposed by maintaining the nature of the Ad hoc On-demand Distance Vector (AODV) routing through the use of Ant Colony Optimization. AAODV maintains the on-demand nature of AODV but works in an adaptive manner. It does not send...
A major design issue in Multi-hop Wireless Networks is the Medium Access Control (MAC) protocols that determine how nodes share the channel to transmit their packets. One type of MAC protocol with efficient spatial reuse characteristics are the Spatial TDMA (STDMA) protocols. STDMA protocols are a class of conflict-free MAC protocols that enable high spectral utilization by scheduling transmissions...
As a new type of wireless network architecture, because of its self-organization, and support multi-hop and heterogeneous networks, Wireless Mesh networks has played an important role in building ldquowireless citiesrdquo and become an research spot in academia and industry. In practical applications, network capacity is the most important need and high network throughput is the most important network...
In this paper, we first propose a traffic model based on scale-free network to investigate the connections between the topology of a network and the routing strategies work on it. Then, we put forward a topology function with a tunable exponential parameter to represent the static part of local routing strategies. In order to make routing algorithms still work well even when the network falls into...
The latest version of IEEE 802.11s draft proposes a simple hop-by-hop congestion control framework without the specific algorithm for congestion detection and local rate control. This paper presents a dynamic pricing policy and new rate control model based congestion control scheme which works at the data link layer (DLL) over IEEE 802.11s draft. We introduce dynamic pricing function as one of the...
This paper introduces a notion of divide-by-K reuse strategy, which allows for K-orthogonal chunks (sub-zones) of OFDMA data regions to be fully reused for all relay links throughout each cell in a TV-hop relay-enhanced cellular TDD-OFDMA system with KlesN. Our objective is to configure a topology of relay stations subject to the divide-by-K reuse strategy, such that the end-to-end routes for relay...
This paper presents a bandwidth occupied time proportion fair MAC algorithm (BOTP-FMAC) for WLAN and wireless mesh network (WMN). It aims to address the unfairness problem in enhanced distributed channel access (EDCA) mechanism, in which higher-priority streaming traffic flows intend to severely deprive the access opportunity of lower-priority traffic flows due to the capture effect, especially when...
Nowadays wireless mesh routers are facilitating with more wireless channels than ever because of the advanced wireless communication technologies such as OFDM, SDR and CR(cognitive radio). With multi-radio and multichannel communication capability, spectrum heterogeneity are widely existing in multi-radio wireless systems, such that network performances usually suffer from channel bandwidth and transmission...
The original topology-transparent TDMA protocol does not perform effectively because of the collisions. In this paper a dynamic topology-transparent TDMA protocol with a novel collision-free algorithm for mobile ad hoc networks is presented. This method avoids collisions utilized the active information of two-hop nodes and dynamically adapts time-slot assignment to the changes of topology and load...
In this paper, we revisit the problem of multicast tree construction in overlay peer-to-peer networks. We present an iterative online multicast tree construction algorithm for multi-session multicasting of elastic content. Our framework allows receivers to request multiple sessions from possibly different servers. Each receiver expresses a quality-of-service requirement using a utility function. We...
Single channel is a severe capacity bottleneck in wireless mesh networks (WMNs). Multiple channels enhance the wireless network capacity by simultaneous transmissions and decrease the interference among nodes. Due to the scarcity of non-overlapped channels, the way of assigning channels becomes extremely important for throughput optimization in WMNs. This article presents a channel assignment algorithm,...
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