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We consider a system where users aboard communication-enabled vehicles are interested in downloading different contents from Internet-based servers. This scenario captures many of the infotainment services that vehicular communication is envisioned to enable, including news reporting, navigation maps, and software updating, or multimedia file downloading. In this paper, we outline the performance...
Video streaming with Peer to Peer (P2P) architecture appears to be an interesting solution for efficient streaming in the heterogeneous scenario of Internet applications. One of the key aspects in a peer-to-peer video broadcast system is to organize the peers into a high quality overlay for disseminating the video stream in order to optimize the bandwidth capacity of the P2P system. This work proposes...
The prime focus of this work is in describing a symbiotic architecture for a Cognitive Radio network, called Cognitive Relaying with Frequency Incentive. The incumbent Primary User (PU) of the spectrum, with a weak transmission link, seeks cooperation from the cognitive Secondary User (SU) nodes in its vicinity, and in return rewards them with incentive frequency bands for their own communication...
Multicast is an important application in cellular networks. The 4G technologies, including WiMAX and LTE, invariably adopt Multiple- Input-Multiple-Output (MIMO) to facilitate spatial multiplexing and fundamentally increase channel capacity. However, state-of-the-art multicast protocols are designed to perform in single-hop mode with a single session, leading to under-utilization of the scarce spectrum...
We present a framework for automated Medium Access Control (MAC) protocol generation based on a model that incorporates multiple MAC neighborhoods as well as acknowledgments. Both the advertisement and acknowledgment packets are automatically generated by an optimization program that is built based on symbolic Monte Carlo simulation. The design flow chain produces an optimal MAC protocol with respect...
Content Delivery Network services, which were originally aimed at achieving fast content delivery, began being used for fast delivery of data stored in cloud services, but they are only effective for frequently accessed data. In this paper, we present an overlay architecture of inter- data center (DC) networking for fast content delivery that is effective for long-tail contents. Based on round-trip...
Thanks to recent advances in hierarchical video coding and overlay network, layered overlay multicast has emerged as an important solution for video streaming over heterogeneous network. In this paper, we formulate it into a joint network flow control and performance optimization problem where adaptive layer rates are determined through a greedy algorithm close to optimal. The overlay network is constrained...
This paper investigates the performance effects of packet depletion on multihop wireless networks. The resulting capacity usage inefficiencies of link assigned schedules are shown even at the maximum supportable uniform network load. Hybrid node-link assignment is employed to extend transmission rights, allowing nodes to transmit on sets of reserve links when the primary scheduled link experiences...
In wireless sensor networks, the nodes near the sink suffer from heavy traffic load. The recent progresses in physical layer make multi-packet reception (MPR) feasible, which may alleviate the suffering nodes. In this paper, we utilize MPR to improve the throughput of wireless sensor networks while maintain the fairness requirement for each sensor. Firstly, we formulate an optimization problem for...
Peer selection strategy is one of the major challenges towards efficient peer-to-peer (P2P) system in wireless mesh networks (WMNs). When peers choose their own utility-maximizing strategies for coalition and peer formation, the solution is always sub-optimal. Peer formation, based on only application layer information, also results in inefficient use of network bandwidth. When multiple recipient-peers...
We describe a methodology that incorporates the impact of control information transfer into MAC protocol optimization. We apply this methodology to the problem of a synchronous broadcast MAC channel, to generate the optimal protocol when the objective function is the average network throughput per slot. We describe a recursive procedure for the symbolic generation of the optimization program for any...
In recent years, along with the increasing popularity of multi-hop wireless networks, there has been a growing demand in the coupling of these networks to external ones such as the Internet. As traffic destined for external networks increases, special attention is required not only in gateway selection, but also in optimized routing and scheduling in order to maximize the network performance. In this...
We consider coexistence of overlapping but distinct primary and secondary random ad hoc networks. A secondary node has node-level and network-level obligations to avoid interference on primary receiving nodes. At the node level, it is allowed to transmit only if it does not detect data reception from its primary neighbors. At the network level, it needs to make sure that the aggregate secondary interference...
In this paper, a practical routing protocol that maximizes the guaranteed node traffic loads in reliable networks is designed and analyzed. The derived node traffic loads can be routed for every traffic pattern, and regardless of the possible single node or link failures. First, it is described how load balanced shortest path routing (LB-SPR) can be optimized to maximize the value of the guaranteed...
Advanced cellular networks are expected to use multihop transmission (relaying) in the cells for the connection between the users and the base station BS as well as for peer to peer connection between two users within the same cell. Therefore they become a mixture of cellular and ad hoc networks that will be referred to as cellular/ ad hoc or CAH network. We apply a conventional resource reuse scheme...
Heterogeneity among users is the main concern in building the unstructured P2P topology. However, the related algorithms either only pay attention to the weight heterogeneity in hitting the queries to improve the search success rate, or think much of the capability heterogeneity in data transmission to achieve load-balancing or high throughput. Because the search and transmission are two inseparable...
Appropriate peer selection from the discovered file holders plays a vital role for peer-to-peer (P2P) file sharing over wireless mesh networks (WMNs). When peers choose their own utility-maximizing strategies for coalition and peer formation, the solution is always sub-optimal. Peer formation, based on only application layer information, also results in inefficient use of network bandwidth. When multiple...
In wireless mesh networks with frequency-agile radios, an algorithm of dynamically combining consecutive channels has recently been proposed. However, the available channel widths are limited in the algorithm. In order to further improve the fairness or the throughput under given fairness, we propose a joint variable width spectrum allocation and link scheduling optimization algorithm. Our algorithm...
Among the route optimization schemes in NEtwork MObility (NEMO), the prefix delegation-based schemes perform better than other schemes. Since the prefix delegation-based schemes are designed for communication between a mobile network and a wired network, they lack evaluation for the case of intra mobile network communication involving MIPv6 incapable hosts in a mobile network. We evaluate prefix delegation-based...
MIMO links enable concurrent transmissions of multiple independent data streams between a pair of nodes, which can significantly improve network throughput. In this paper, we study the stream control and scheduling problems in multihop wireless networks with MIMO links. We present a constant factor approximation algorithm as well as an efficient heuristic algorithm for stream control. Moreover, we...
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