The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
Biswanath Mukherjee - One of the best experts on this subject based on the ideXlab platform.
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hybrid Wireless optical broadband access network woban a review of relevant challenges
Journal of Lightwave Technology, 2007Co-Authors: S Sarkar, Sudhir Dixit, Biswanath MukherjeeAbstract:The hybrid Wireless-optical broadband-access network (WOBAN) is a promising architecture for future access networks. Recently, the Wireless part of WOBAN has been gaining increasing attention, and early versions are being deployed as municipal access solutions to eliminate the wired drop to every Wireless Router at customer premises. This architecture saves on network deployment cost because the fiber need not penetrate each end-user, and it extends the reach of emerging optical-access solutions, such as passive optical networks. This paper first presents an architecture and a vision for the WOBAN and articulates why the combination of Wireless and optical presents a compelling solution that optimizes the best of both worlds. While this discussion briefly touches upon the business drivers, the main arguments are based on technical and deployment considerations. Consequently, the rest of this paper reviews a variety of relevant research challenges, namely, network setup, network connectivity, and fault-tolerant behavior of the WOBAN. In the network setup, we review the design of a WOBAN where the back end is a wired optical network, the front end is managed by a Wireless connectivity, and, in between, the tail ends of the optical part [known as optical network unit (ONU)] communicate directly with Wireless base stations (known as ldquogateway Routersrdquo). We outline algorithms to optimize the placement of ONUs in a WOBAN and report on a survey that we conducted on the distribution and types of Wireless Routers in the Wildhorse residential neighborhood of North Davis, CA. Then, we examine the WOBAN's routing properties (network connectivity), discuss the pros and cons of various routing algorithms, and summarize the idea behind fault-tolerant design of such hybrid networks.
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dara delay aware routing algorithm in a hybrid Wireless optical broadband access network woban
International Conference on Communications, 2007Co-Authors: S Sarkar, Honghsu Yen, Sudhir Dixit, Biswanath MukherjeeAbstract:Hybrid Wireless-optical broadband access network (WOBAN) is a promising architecture for future network operations. Recently, the Wireless part of WOBAN has been gaining increasing attention and early versions are being deployed as a municipal access solution to eliminate the wired backhaul to every Wireless Router. This architecture saves on network deployment costs because fiber (or wiring) does not need to extend to the end user, and it extends the reach of emerging optical access solutions, e.g., passive optical network (PON)-based access solutions. However, a major research opportunity exists in developing an efficient routing algorithm for the Wireless front end of WOBAN. We propose and investigate the characteristics of "delay- aware routing algorithm (DARA)" that minimizes the average packet delay in the Wireless front end of a WOBAN. We model Wireless Routers as queues and predict Wireless link states periodically. Our simulation experiments show that DARA achieves better load balancing and less congestion compared to tradional approaches such as minimum-hop routing algorithm (MHRA) and shortest- path routing algorithm (SPRA). In addition to minimizing the delay, DARA also improves the average hop count compared to the predictive throughput routing algorithm (PTRA), a popular protocol used in several deployments for the Wireless front end of a WOBAN.
S Sarkar - One of the best experts on this subject based on the ideXlab platform.
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hybrid Wireless optical broadband access network woban a review of relevant challenges
Journal of Lightwave Technology, 2007Co-Authors: S Sarkar, Sudhir Dixit, Biswanath MukherjeeAbstract:The hybrid Wireless-optical broadband-access network (WOBAN) is a promising architecture for future access networks. Recently, the Wireless part of WOBAN has been gaining increasing attention, and early versions are being deployed as municipal access solutions to eliminate the wired drop to every Wireless Router at customer premises. This architecture saves on network deployment cost because the fiber need not penetrate each end-user, and it extends the reach of emerging optical-access solutions, such as passive optical networks. This paper first presents an architecture and a vision for the WOBAN and articulates why the combination of Wireless and optical presents a compelling solution that optimizes the best of both worlds. While this discussion briefly touches upon the business drivers, the main arguments are based on technical and deployment considerations. Consequently, the rest of this paper reviews a variety of relevant research challenges, namely, network setup, network connectivity, and fault-tolerant behavior of the WOBAN. In the network setup, we review the design of a WOBAN where the back end is a wired optical network, the front end is managed by a Wireless connectivity, and, in between, the tail ends of the optical part [known as optical network unit (ONU)] communicate directly with Wireless base stations (known as ldquogateway Routersrdquo). We outline algorithms to optimize the placement of ONUs in a WOBAN and report on a survey that we conducted on the distribution and types of Wireless Routers in the Wildhorse residential neighborhood of North Davis, CA. Then, we examine the WOBAN's routing properties (network connectivity), discuss the pros and cons of various routing algorithms, and summarize the idea behind fault-tolerant design of such hybrid networks.
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dara delay aware routing algorithm in a hybrid Wireless optical broadband access network woban
International Conference on Communications, 2007Co-Authors: S Sarkar, Honghsu Yen, Sudhir Dixit, Biswanath MukherjeeAbstract:Hybrid Wireless-optical broadband access network (WOBAN) is a promising architecture for future network operations. Recently, the Wireless part of WOBAN has been gaining increasing attention and early versions are being deployed as a municipal access solution to eliminate the wired backhaul to every Wireless Router. This architecture saves on network deployment costs because fiber (or wiring) does not need to extend to the end user, and it extends the reach of emerging optical access solutions, e.g., passive optical network (PON)-based access solutions. However, a major research opportunity exists in developing an efficient routing algorithm for the Wireless front end of WOBAN. We propose and investigate the characteristics of "delay- aware routing algorithm (DARA)" that minimizes the average packet delay in the Wireless front end of a WOBAN. We model Wireless Routers as queues and predict Wireless link states periodically. Our simulation experiments show that DARA achieves better load balancing and less congestion compared to tradional approaches such as minimum-hop routing algorithm (MHRA) and shortest- path routing algorithm (SPRA). In addition to minimizing the delay, DARA also improves the average hop count compared to the predictive throughput routing algorithm (PTRA), a popular protocol used in several deployments for the Wireless front end of a WOBAN.
Sudhir Dixit - One of the best experts on this subject based on the ideXlab platform.
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hybrid Wireless optical broadband access network woban a review of relevant challenges
Journal of Lightwave Technology, 2007Co-Authors: S Sarkar, Sudhir Dixit, Biswanath MukherjeeAbstract:The hybrid Wireless-optical broadband-access network (WOBAN) is a promising architecture for future access networks. Recently, the Wireless part of WOBAN has been gaining increasing attention, and early versions are being deployed as municipal access solutions to eliminate the wired drop to every Wireless Router at customer premises. This architecture saves on network deployment cost because the fiber need not penetrate each end-user, and it extends the reach of emerging optical-access solutions, such as passive optical networks. This paper first presents an architecture and a vision for the WOBAN and articulates why the combination of Wireless and optical presents a compelling solution that optimizes the best of both worlds. While this discussion briefly touches upon the business drivers, the main arguments are based on technical and deployment considerations. Consequently, the rest of this paper reviews a variety of relevant research challenges, namely, network setup, network connectivity, and fault-tolerant behavior of the WOBAN. In the network setup, we review the design of a WOBAN where the back end is a wired optical network, the front end is managed by a Wireless connectivity, and, in between, the tail ends of the optical part [known as optical network unit (ONU)] communicate directly with Wireless base stations (known as ldquogateway Routersrdquo). We outline algorithms to optimize the placement of ONUs in a WOBAN and report on a survey that we conducted on the distribution and types of Wireless Routers in the Wildhorse residential neighborhood of North Davis, CA. Then, we examine the WOBAN's routing properties (network connectivity), discuss the pros and cons of various routing algorithms, and summarize the idea behind fault-tolerant design of such hybrid networks.
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dara delay aware routing algorithm in a hybrid Wireless optical broadband access network woban
International Conference on Communications, 2007Co-Authors: S Sarkar, Honghsu Yen, Sudhir Dixit, Biswanath MukherjeeAbstract:Hybrid Wireless-optical broadband access network (WOBAN) is a promising architecture for future network operations. Recently, the Wireless part of WOBAN has been gaining increasing attention and early versions are being deployed as a municipal access solution to eliminate the wired backhaul to every Wireless Router. This architecture saves on network deployment costs because fiber (or wiring) does not need to extend to the end user, and it extends the reach of emerging optical access solutions, e.g., passive optical network (PON)-based access solutions. However, a major research opportunity exists in developing an efficient routing algorithm for the Wireless front end of WOBAN. We propose and investigate the characteristics of "delay- aware routing algorithm (DARA)" that minimizes the average packet delay in the Wireless front end of a WOBAN. We model Wireless Routers as queues and predict Wireless link states periodically. Our simulation experiments show that DARA achieves better load balancing and less congestion compared to tradional approaches such as minimum-hop routing algorithm (MHRA) and shortest- path routing algorithm (SPRA). In addition to minimizing the delay, DARA also improves the average hop count compared to the predictive throughput routing algorithm (PTRA), a popular protocol used in several deployments for the Wireless front end of a WOBAN.
Vincent Wai Sum Wong - One of the best experts on this subject based on the ideXlab platform.
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joint logical topology design interface assignment channel allocation and routing for multi channel Wireless mesh networks
IEEE Transactions on Wireless Communications, 2007Co-Authors: Amirhamed Mohsenianrad, Vincent Wai Sum WongAbstract:A multi-channel Wireless mesh network (MC-WMN) consists of a number of stationary Wireless Routers, where each Router is equipped with multiple network interface cards (NICs). Each NIC operates on a distinct frequency channel. Two neighboring Routers establish a logical link if each one has an NIC operating on a common channel. Given the physical topology of the Routers and other constraints, four important issues should be addressed in MC-WMNs: logical topology formation, interface assignment, channel allocation, and routing. Logical topology determines the set of logical links. Interface assignment decides how the logical links should be assigned to the NICs in each Wireless Router. Channel allocation selects the operating channel for each logical link. Finally, routing determines through which logical links the packets should be forwarded. In this paper, we mathematically formulate the logical topology design, interface assignment, channel allocation, and routing as a joint linear optimization problem. Our proposed MC-WMN architecture is called TiMesh. Extensive ns-2 simulation experiments are conducted to evaluate the performance of TiMesh and compare it with two other MC-WMN architectures Hyacinth [1] and CLICA [2]. Simulation results show that TiMesh achieves higher aggregated network throughput and lower end-to-end delay than Hyacinth and CLICA for both TCP and UDP traffic. It also provides better fairness among different flows.
Gilles Straub - One of the best experts on this subject based on the ideXlab platform.
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Efficient and Transparent Wi-Fi Offloading for HTTP(S) POSTs
IEEE Transactions on Mobile Computing, 2016Co-Authors: Kévin Huguenin, Nicolas Le Scouarnec, Erwan Le Merrer, Gilles StraubAbstract:With the emergence of online platforms for (social) sharing, collaboration and backing up, mobile users generate ever-increasing amounts of digital data, such as documents, photos, and videos, which they upload while on the go. Cellular Internet connectivity (e.g., 3G/4G) enables mobile users to upload their data but drains the battery of their devices and overloads mobile service providers. Wi-Fi data offloading overcomes the aforementioned issues for delay-tolerant data. However, it comes at the cost of constrained mobility for users, as they are required to stay within a given area while the data is uploaded. The up-link of the broadband connection of the access point often constitutes a bottleneck and incurs waiting times of up to tens of minutes. In this paper, we advocate the exploitation of the storage capabilities of common devices located on the Wi-Fi access point's LAN, typically residential gateways, NAS units or set-top boxes, to decrease the waiting time. We propose Hoop, a system for offloading upload tasks onto such devices. Hoop operates seamlessly on http(s) post, which makes it highly generic and widely applicable; it also requires limited changes on the gateways and on the web servers and none to existing protocols or browsers. Hoop is secure and, in a typical setting, reduces the waiting time by up to a factor of 46. We analyze the security of Hoop and evaluate its performance by correlating mobility traces of users with the position of the Wi-Fi access points of a leading community network (i.e., FON) that relies on major national ISPs. We show that, in practice, Hoop drastically decreases the delay between the time the photo is taken and the time it is uploaded, compared to regular Wi-Fi data offloading. We also demonstrate the practicality of Hoop by implementing it on a Wireless Router. © 2015 IEEE.
