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In a P2P-based media distribution network (PMDN), content migration is one of the key problems that affect the overall performance of a system. In the system hierarchy, the content migration problem consists of two levels of migration: provider-level migration and user-level migration. In this paper, we focus on the former, provider-level migration, where the goal is to reduce data migration cost...
In this paper, we exploit cooperative diversity, channel diversity and multi-user diversity gains in an OFDMA-based wireless relay network by studying a joint channel and relay assignment problem. This problem turns out to be NP-hard. First, a mixed integer linear programming formulation is presented to provide optimal solutions. We then present a constant factor approximation algorithm and two heuristic...
In this paper, we investigate the convergence behavior of the primal-dual scaled gradient algorithm (PDSGA) for solving distributed network utility maximization problems under time-varying fading channels. Our analysis shows that the proposed PDSGA converges to a limit region rather than a point under FSMC channels. We also show that the asymptotic tracking errors are given by O(T̅/N̅), where T̅ and...
Multiple description scalable coding based on T+2D wavelet decomposition structure is highly flexible for peer-to-peer (P2P) video streaming. Finding the optimal truncation point of each code block (CB) within each description is an NP-hard problem. To implement an efficient low-complexity solution, we propose a simple clustering algorithm for partitioning the CBs into a limited number of clusters,...
In this paper, we consider joint end-to-end congestion control and multiuser scheduling in multi-hop wireless networks, where orthogonal frequency-division multiple access (OFDMA) is the air interface. Compared to its single-channel counterpart, this problem is significantly more challenging because subchannel assignment and power allocation for all nodes and network traffic need to be jointly optimized...
This paper studies how to design distributed resource allocation in multi-radio multi-channel wireless mesh networks with the objective of maximizing the network utility. We address the problem via a cross-layer approach with a joint consideration of multi-path routing, congestion control, scheduling, radio allocation and channel assignment. The problem is formulated as a mixed-integer non-linear...
MIMO multi-hop channel plays an important role in wireless ad hoc networks. In this paper, we investigate the resource allocation optimization problem in order to achieve throughput maximization with given resource constraints. We propose algorithms with low complexity to achieve maximum capacity. The main idea is to determine the rank of the optimal transmit covariance matrix and the optimal power...
This paper focuses on subchannel and power allocation problem in OFDMA-based decode-and-forward (DF) cooperative relay networks. The objective of this problem is to maximize the total data rate under the constraints of joint total transmission power and subchannels occupation, while maintaining the maximum fairness among multiple relay nodes. We transform this mixed integer programming problem to...
Rate allocation is a fundamental problem in the operation of a wireless network because of the necessity to schedule the operation of mutually interfering links between the nodes. Among the many reasons behind the importance of efficiently determining the membership of an arbitrary rate vector in the feasibility region, is its high relevance in optimal cross layer design. A key feature in a wireless...
Future wireless infrastructure networks will dynamically access spectrum for maximum utilization. However, the fundamental challenge is how to provide stable spectrum access required for most applications. Using dynamic spectrum access, each node's spectrum usage is inherently unpredictable and unstable. We propose to address this challenge by integrating interference-aware statistical admission control...
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