Advances for In-Vehicle and Mobile Systems: Challenges for International Standards, Apr 20, 2007
In September 2005, the" Second Biennial Workshop on DSP (digital signal processing) for Mobi... more In September 2005, the" Second Biennial Workshop on DSP (digital signal processing) for Mobile and Vehicular Systems" took place in Sesimbra, Portugal with 32 excellent papers present from all over the world, with a Keynote Address entitled" Information Overload and Driver Distraction: The Road to Disaster," delivered by Bruce A. Magladry, Director of the Office of Highway Safety, US National Transportation Safety Board (NTSB), and a panel discussion with experts from academic, industry and federal agencies. This meeting ...
AbstractInternet-based communications have amazingly evolved in recent years. As a consequence, ... more AbstractInternet-based communications have amazingly evolved in recent years. As a consequence, the number and complexity of distributed systems which provide access to services and applications has dramatically increased. As long as these services have ...
Abstract: This document lists overall requirements of the ADHOCSYS network. Detailed guidelines a... more Abstract: This document lists overall requirements of the ADHOCSYS network. Detailed guidelines are also provided for the future research that will be performed in Work Package 2. A separate deliverable, D5, has been prepared to define detailed requirements and ...
Abstract:-In this paper we present a perceptual ARQ algorithm specifically designed for real-time... more Abstract:-In this paper we present a perceptual ARQ algorithm specifically designed for real-time 802.11 video communications. A fundamental characteristic of the algorithm is its ability to take into account the perceptual and temporal importance of each packet at the same time. A priority value is associated to each packet to determine which one to retransmit at each retransmission opportunity. Compared to the standard 802.11 MAC-layer ARQ scheme, the proposed technique delivers higher perceptual quality because only the most ...
the Proceedings of 14th European Signal Processing Conference. European Signal Processing Conference (EUSIPCO), 2006
This paper describes a network adaptive real-time demonstrator for converged applications (audio,... more This paper describes a network adaptive real-time demonstrator for converged applications (audio, video, voice, and data) on an IEEE802. 11g Wireless Home Network. Video transmission quality is optimised by dynamically adapting the source video bit-rate to a real-time estimate of the available bandwidth on the wireless network and by introducing data redundancy to recover packet losses (Forward Error Correction). Video adaptation is done by DCT-domain video transcoding algorithms performed in realtime on a digital ...
This paper focuses on video communications in intervehicular environments using the 802.11 ad hoc... more This paper focuses on video communications in intervehicular environments using the 802.11 ad hoc network protocol. In the first part of the work we present the results of transmission experiments between two cars equipped with 802.11 devices in two typical driving scenarios, urban and highway. Various video bitrates and packetization policies have been tested. The results show that the two scenarios differ in terms of link availability and SNR. Moreover, the video quality measured at the receiver by means of the PSNR ...
... [5] Gaurav Mathur, Peter Desnoyers, Deepak Ganesan, and Prashant Shenoy, Capsule ... 195208... more ... [5] Gaurav Mathur, Peter Desnoyers, Deepak Ganesan, and Prashant Shenoy, Capsule ... 195208, ACM. [6] A. Boulis, S. Ganeriwal, and MB Srivastava, Aggregation in sensor networks: an energy-accuracy trade-off, in Sensor Network Protocols and Applications, 2003. ...
In this paper we present our vision, and discuss the main research problems along with prospectiv... more In this paper we present our vision, and discuss the main research problems along with prospective solutions, on the evaluation of queries over data available and processable through services. In particular, we address queries in dynamic environments concerning aspects such as mobility and continuous data. These queries entail the potential of offering users ubiquitous access to relevant information in the form of value-added services. The core of our proposed approach, lies in the development of a services coordination framework complemented with proven traditional query processing techniques adapted to service-based environments. Thus, we derive the blueprint for an efficient solution for query evaluation in service-based contexts and their related application areas.
Abstract This paper addresses the real-time transmission optimization of loss tolerant informati... more Abstract This paper addresses the real-time transmission optimization of loss tolerant information streams over Vehicular Ad Hoc Networks. The proposed FEC and Interleaving Real Time Optimization (FIRO) technique dynamically adapts the two well-known error resilience techniques to ...
This chapter presents a novel approach to provide scalable and service-oriented communications ov... more This chapter presents a novel approach to provide scalable and service-oriented communications over multihop mesh networks. In such a scenario, the performance of existing routing algorithms can be impaired by problems related to scalability, stability, and service-awareness. We start with a survey on existing solutions including commercial proposals. Then a novel framework, targeted at providing a reliable set of services in multihop mesh networks, is presented. Within this framework, several extensions to the OLSR routing protocol are proposed, such as hierarchical routing, power aware routing, multihoming, load balancing and multiple interface support. A cross-layer design technique is described to take the advantage of additional information, such as link-layer notification. A heuristic, service-oriented Quality of Service (QoS) approach is also proposed, aiming at providing QoS among both different nodes (via IEEE 802.11e standard) and different flows within a single node (via the Hierarchical Token Bucket mechanism).
While various wireless mesh networks are being deployed in urban areas and university campuses fo... more While various wireless mesh networks are being deployed in urban areas and university campuses for diverse purposes, less effort has been devoted to use such networks for broadband access in rural and mountain areas. In this paper, we present a broadband Internet access paradigm using multi-hop wireless mesh networks which is currently being validated using a real-life pilot network deployed in a small village in Northern Italy. This solution is developed by the ADHOCSYS project, which is financed by the European Commission under the FP6 IST strategic objective "Broadband for All". Challenges exist in various aspects in order to develop a robust and service-oriented network, including for example network architecture, application scenarios, auto-configuration, routing, QoS, security and authentication, power supply, hardware selection and software development, business model etc. Following a general vision of the project, two key aspects, i. e. routing and QoS, are presented in more details in this paper.
This paper focuses on improving the performance of video communications in inter-vehicular enviro... more This paper focuses on improving the performance of video communications in inter-vehicular environments using the 802.11 ad hoc network protocol. We present the results of transmission experiments between two cars equipped with 802.11 standard devices in two typical driving scenarios, urban and highway, showing the characteristics of each scenario in terms of link availability and SNR for different bitrates and packetization policies. Moreover, we also evaluate the video quality at the receiver by means of the PSNR distortion measure, showing that the best packetization policy depends on the scenario. On the basis of these results, we design an adaptive algorithm which dynamically varies the video packet size to improve the efficiency of the video transmission. Results show that consistent perceptual quality gains in terms of PSNR value (up to about 3 dB) can be achieved with respect to a fixed-policy transmission technique.
This paper focuses on the optimized transmission of multimedia sequences over vehicular ad-hoc ne... more This paper focuses on the optimized transmission of multimedia sequences over vehicular ad-hoc networks (VANETs). Among the main drawbacks of the high node mobility of the vehicular scenario are the high channel loss rate, burst length and intermittent connectivity. To allow real-time streaming of media sequences in such a scenario, we propose a technique based on forward error correction (FEC) and interleaving algorithms able to recover most of packet losses and reduce the length of the error bursts. The proposed technique is based on the optimization of the FEC/Interleaving parameters under real-time constraints. It is implemented at packet level, to allow a straightforward adoption in the existing wireless devices. By resorting to standard compliant, real-time RTCP reports, we also develop an adaptive technique able to adapt to fast channel variations and to optimize both the overhead required by the proactive error recovery scheme and the additional delay introduced by the interleaver. Simulations based on real world experiments show that the proposed technique is able to gain over 2 dB in terms of video PSNR with respect to the standard transmission, while in the adaptive case the gain is over 2.5 dB PSNR, with a total overhead of about 50%.
Advances for In-Vehicle and Mobile Systems: Challenges for International Standards, Apr 20, 2007
In September 2005, the" Second Biennial Workshop on DSP (digital signal processing) for Mobi... more In September 2005, the" Second Biennial Workshop on DSP (digital signal processing) for Mobile and Vehicular Systems" took place in Sesimbra, Portugal with 32 excellent papers present from all over the world, with a Keynote Address entitled" Information Overload and Driver Distraction: The Road to Disaster," delivered by Bruce A. Magladry, Director of the Office of Highway Safety, US National Transportation Safety Board (NTSB), and a panel discussion with experts from academic, industry and federal agencies. This meeting ...
AbstractInternet-based communications have amazingly evolved in recent years. As a consequence, ... more AbstractInternet-based communications have amazingly evolved in recent years. As a consequence, the number and complexity of distributed systems which provide access to services and applications has dramatically increased. As long as these services have ...
Abstract: This document lists overall requirements of the ADHOCSYS network. Detailed guidelines a... more Abstract: This document lists overall requirements of the ADHOCSYS network. Detailed guidelines are also provided for the future research that will be performed in Work Package 2. A separate deliverable, D5, has been prepared to define detailed requirements and ...
Abstract:-In this paper we present a perceptual ARQ algorithm specifically designed for real-time... more Abstract:-In this paper we present a perceptual ARQ algorithm specifically designed for real-time 802.11 video communications. A fundamental characteristic of the algorithm is its ability to take into account the perceptual and temporal importance of each packet at the same time. A priority value is associated to each packet to determine which one to retransmit at each retransmission opportunity. Compared to the standard 802.11 MAC-layer ARQ scheme, the proposed technique delivers higher perceptual quality because only the most ...
the Proceedings of 14th European Signal Processing Conference. European Signal Processing Conference (EUSIPCO), 2006
This paper describes a network adaptive real-time demonstrator for converged applications (audio,... more This paper describes a network adaptive real-time demonstrator for converged applications (audio, video, voice, and data) on an IEEE802. 11g Wireless Home Network. Video transmission quality is optimised by dynamically adapting the source video bit-rate to a real-time estimate of the available bandwidth on the wireless network and by introducing data redundancy to recover packet losses (Forward Error Correction). Video adaptation is done by DCT-domain video transcoding algorithms performed in realtime on a digital ...
This paper focuses on video communications in intervehicular environments using the 802.11 ad hoc... more This paper focuses on video communications in intervehicular environments using the 802.11 ad hoc network protocol. In the first part of the work we present the results of transmission experiments between two cars equipped with 802.11 devices in two typical driving scenarios, urban and highway. Various video bitrates and packetization policies have been tested. The results show that the two scenarios differ in terms of link availability and SNR. Moreover, the video quality measured at the receiver by means of the PSNR ...
... [5] Gaurav Mathur, Peter Desnoyers, Deepak Ganesan, and Prashant Shenoy, Capsule ... 195208... more ... [5] Gaurav Mathur, Peter Desnoyers, Deepak Ganesan, and Prashant Shenoy, Capsule ... 195208, ACM. [6] A. Boulis, S. Ganeriwal, and MB Srivastava, Aggregation in sensor networks: an energy-accuracy trade-off, in Sensor Network Protocols and Applications, 2003. ...
In this paper we present our vision, and discuss the main research problems along with prospectiv... more In this paper we present our vision, and discuss the main research problems along with prospective solutions, on the evaluation of queries over data available and processable through services. In particular, we address queries in dynamic environments concerning aspects such as mobility and continuous data. These queries entail the potential of offering users ubiquitous access to relevant information in the form of value-added services. The core of our proposed approach, lies in the development of a services coordination framework complemented with proven traditional query processing techniques adapted to service-based environments. Thus, we derive the blueprint for an efficient solution for query evaluation in service-based contexts and their related application areas.
Abstract This paper addresses the real-time transmission optimization of loss tolerant informati... more Abstract This paper addresses the real-time transmission optimization of loss tolerant information streams over Vehicular Ad Hoc Networks. The proposed FEC and Interleaving Real Time Optimization (FIRO) technique dynamically adapts the two well-known error resilience techniques to ...
This chapter presents a novel approach to provide scalable and service-oriented communications ov... more This chapter presents a novel approach to provide scalable and service-oriented communications over multihop mesh networks. In such a scenario, the performance of existing routing algorithms can be impaired by problems related to scalability, stability, and service-awareness. We start with a survey on existing solutions including commercial proposals. Then a novel framework, targeted at providing a reliable set of services in multihop mesh networks, is presented. Within this framework, several extensions to the OLSR routing protocol are proposed, such as hierarchical routing, power aware routing, multihoming, load balancing and multiple interface support. A cross-layer design technique is described to take the advantage of additional information, such as link-layer notification. A heuristic, service-oriented Quality of Service (QoS) approach is also proposed, aiming at providing QoS among both different nodes (via IEEE 802.11e standard) and different flows within a single node (via the Hierarchical Token Bucket mechanism).
While various wireless mesh networks are being deployed in urban areas and university campuses fo... more While various wireless mesh networks are being deployed in urban areas and university campuses for diverse purposes, less effort has been devoted to use such networks for broadband access in rural and mountain areas. In this paper, we present a broadband Internet access paradigm using multi-hop wireless mesh networks which is currently being validated using a real-life pilot network deployed in a small village in Northern Italy. This solution is developed by the ADHOCSYS project, which is financed by the European Commission under the FP6 IST strategic objective "Broadband for All". Challenges exist in various aspects in order to develop a robust and service-oriented network, including for example network architecture, application scenarios, auto-configuration, routing, QoS, security and authentication, power supply, hardware selection and software development, business model etc. Following a general vision of the project, two key aspects, i. e. routing and QoS, are presented in more details in this paper.
This paper focuses on improving the performance of video communications in inter-vehicular enviro... more This paper focuses on improving the performance of video communications in inter-vehicular environments using the 802.11 ad hoc network protocol. We present the results of transmission experiments between two cars equipped with 802.11 standard devices in two typical driving scenarios, urban and highway, showing the characteristics of each scenario in terms of link availability and SNR for different bitrates and packetization policies. Moreover, we also evaluate the video quality at the receiver by means of the PSNR distortion measure, showing that the best packetization policy depends on the scenario. On the basis of these results, we design an adaptive algorithm which dynamically varies the video packet size to improve the efficiency of the video transmission. Results show that consistent perceptual quality gains in terms of PSNR value (up to about 3 dB) can be achieved with respect to a fixed-policy transmission technique.
This paper focuses on the optimized transmission of multimedia sequences over vehicular ad-hoc ne... more This paper focuses on the optimized transmission of multimedia sequences over vehicular ad-hoc networks (VANETs). Among the main drawbacks of the high node mobility of the vehicular scenario are the high channel loss rate, burst length and intermittent connectivity. To allow real-time streaming of media sequences in such a scenario, we propose a technique based on forward error correction (FEC) and interleaving algorithms able to recover most of packet losses and reduce the length of the error bursts. The proposed technique is based on the optimization of the FEC/Interleaving parameters under real-time constraints. It is implemented at packet level, to allow a straightforward adoption in the existing wireless devices. By resorting to standard compliant, real-time RTCP reports, we also develop an adaptive technique able to adapt to fast channel variations and to optimize both the overhead required by the proactive error recovery scheme and the additional delay introduced by the interleaver. Simulations based on real world experiments show that the proposed technique is able to gain over 2 dB in terms of video PSNR with respect to the standard transmission, while in the adaptive case the gain is over 2.5 dB PSNR, with a total overhead of about 50%.
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Papers by Paolo Bucciol