Abstract TCP congestion control has been designed to ensure Internet stability along with fair an... more Abstract TCP congestion control has been designed to ensure Internet stability along with fair and efficient allocation of the network bandwidth. During the last decade, many congestion control algorithms have been proposed to improve the classic Tahoe/Reno TCP congestion control. This paper aims at evaluating and comparing three control algorithms, which are Westwood+, New Reno and Vegas TCP, using both Ns-2 simulations and live Internet measurements.
Abstract Packet sampling techniques introduce measurement errors that should be carefully handled... more Abstract Packet sampling techniques introduce measurement errors that should be carefully handled in order to correctly characterize the network behavior. In the literature several works have studied the statistical properties of packet sampling and the way it should be inverted to recover the original network measurements. Here we take the new direction of studying the spectral properties of packet sampled traffic.
Abstract The TCP-friendly rate control (TFRC) algorithm has been proposed for supporting applicat... more Abstract The TCP-friendly rate control (TFRC) algorithm has been proposed for supporting applications such as video streaming or telephony over the Internet, where a relative smooth sending rate is of importance. The fairness and friendliness of TFRC over scenarios with multiple congested routers is evaluated. Results obtained using the ns-2 simulator show that while TFRC improves network utilisation with respect to Reno TCP, it exhibits a significant degree of unfairness and unfriendliness towards Reno TCP.
Abstract Long-term evolution (LTE) femtocells represent a very promising answer to the ever growi... more Abstract Long-term evolution (LTE) femtocells represent a very promising answer to the ever growing bandwidth demand of mobile applications. They can be easily deployed without requiring a centralized planning, to provide high data rate connectivity with a limited coverage. In this way, the overall capacity of the cellular network can be greatly improved. At the same time, the uncoordinated setup of femtocells poses new issues that require a deep and thorough analysis before spreading this technology worldwide.
Abstract Machine-to-machine (M2M) communications refer to the ability of devices to communicate w... more Abstract Machine-to-machine (M2M) communications refer to the ability of devices to communicate with each other without human intervention. Being arguably the most industrial branch of the emerging Internet of Things (IoT), it has some very stringent requirements on reliability, low-power and often delay. With cellular M2M today still being relatively power hungry, we concentrate in this paper on capillary M2M which is also more cost-efficient.
Abstract Wireless Multimedia Sensor Networks (WMSNs) are used in many application domains, such a... more Abstract Wireless Multimedia Sensor Networks (WMSNs) are used in many application domains, such as surveillance systems, telemedicine and so on. In order to ensure a broad deployment of such innovative services, strict requirements on security, privacy, and distributed processing of multimedia contents should be satisfied, taking also into account the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes.
Abstract The additive increase/multiplicative decrease probing paradigm is at the core of TCP con... more Abstract The additive increase/multiplicative decrease probing paradigm is at the core of TCP congestion control. To improve the classic Reno/New Reno congestion control algorithms, the recent Westwood+ TCP proposes to substitute the multiplicative decrease phase with an adaptive decrease phase, which takes into account an end-to-end estimate of the available bandwidth obtained by filtering the stream of returning ACKs. This paper aims at evaluating the performance of Westwood+ TCP over the real Internet.
Abstract In recent years the new vision of data-centric networks has emerged as a natural way to ... more Abstract In recent years the new vision of data-centric networks has emerged as a natural way to satisfy user needs in the Future Internet. It is based on novel architectures oriented towards data sharing and delivering as opposite to classic host-to-host communications. Among several proposals, Content Centric Networking has been conceived as a very promising solution by the Palo Alto Research Center team.
Abstract Wireless ad-hoc networks represent an emerging technology, well suited for providing tem... more Abstract Wireless ad-hoc networks represent an emerging technology, well suited for providing temporary network connectivity where a wired infrastructure cannot be easily set up. The very popular 802.11 standard enables wireless ad-hoc networking, using the distributed coordination function (DCF) for multiple access to the shared radio channel.
Abstract A Selective Dropping Congestion Control (SDCC) algorithm is proposed in this work, for w... more Abstract A Selective Dropping Congestion Control (SDCC) algorithm is proposed in this work, for wireless multimedia sensor networks based on scalable multimedia encoding. SDCC, which has been designed by means of linear discrete time control theory arguments, can be applied in a fully distributed way. It periodically evaluates at each node the amount of data to drop, in order to control the level of the transmission queue, and then selects the packets to discard based on their relevance to the image quality.
Abstract—The 802.11 e working group has recently proposed inno-vative functionalities in order to... more Abstract—The 802.11 e working group has recently proposed inno-vative functionalities in order to support delay-sensitive multimedia applications, such as real-time voice and video, in Wireless Local Area Networks (WLANs). This paper proposes an innovative dynamic bandwidth allocation algorithm along with a measurement based CAC algorithm for providing delay guarantees to real-time media flows in IEEE 802.11 e networks.
Abstract: This paper proposes a new rate based congestion control algorithm that significantly im... more Abstract: This paper proposes a new rate based congestion control algorithm that significantly improves the utilization of planetary links with respect to classic TCP congestion control. Ns-2 simulation results have shown that the proposed algorithm provides significant goodput improvements with respect to New Reno, Reno Sack, Reno Fack, Vegas, and Westwood+ TCP in the presence of RTTs larger than 1s and smaller than 2000s and packet loss probability ranging from 0.0001 to 0.01
The Hybrid Coordination Function (HCF) has been recently proposed by the 802.11 e working group i... more The Hybrid Coordination Function (HCF) has been recently proposed by the 802.11 e working group in order to provide real-time services in Wireless Local Area Networks (WLANs). HCF is made of a contention-based channel access, known as Enhanced Distributed Coordination Access (EDCA), and of a HCF Controlled Channel Access (HCCA), which requires a centralized controller, called Hybrid Coordinator (HC).
Abstract The adoption of scalable encoders can improve P2P-TV performance in heterogeneous scenar... more Abstract The adoption of scalable encoders can improve P2P-TV performance in heterogeneous scenarios, where peers with different capabilities coexist. In fact, each peer could dynamically adapt the resolution of the audio/video signals to its computation capabilities and available communication resources. Despite these clear benefits, casting a scalable encoder in a P2P-TV system requires sophisticated scheduling strategies in order to maximize user satisfaction.
Abstract The main contribution of this paper is an end-to-end rate-based congestion control algor... more Abstract The main contribution of this paper is an end-to-end rate-based congestion control algorithm for unicast quality adaptive video streaming that we call Adaptive Rate Control (ARC). The algorithm is based on end-to-end estimation of both available bandwidth and queue backlog. ARC has been compared with the TCP-Friendly Rate Control (TFRC) algorithm via the ns-2 simulator. In particular, both single bottleneck and multi-hop scenarios with and without lossy links have been considered.
Nowadays, technology is mature enough to allow the production of multimedia wireless sensors, ie,... more Nowadays, technology is mature enough to allow the production of multimedia wireless sensors, ie, wireless nodes able to acquire and process audio/video signals. A Wireless Multimedia Sensor Network (WMSN) relies on a set of collaborating multimedia wireless sensors to provide distributed multimedia sensing services (see Fig. 1).
Recently, the 802.11 e Working Group (WG) has proposed the Hybrid Coordination Function (HCF), wh... more Recently, the 802.11 e Working Group (WG) has proposed the Hybrid Coordination Function (HCF), which has a HCF Controlled Channel Access (HCCA) and an Enhanced Distributed Coordination Access (EDCA), in order to provide QoS in WLANs. In this paper an innovative HCCA-based algorithm, which will be referred to as Power Save Feedback Based Dynamic Scheduler (PS FBDS) providing bounded delays while ensuring energy saving, has been developed.
Abstract TCP congestion control was designed and optimized for wired networks. During recent year... more Abstract TCP congestion control was designed and optimized for wired networks. During recent years, however, the popularity of wireless network infrastructures enabling ubiquitous Internet access, such as Universal Mobile Telecommunication System (UMTS), has grown considerably.
Abstract—Content-Centric Networking (CCN) is a promising data-centric architecture, based on in-n... more Abstract—Content-Centric Networking (CCN) is a promising data-centric architecture, based on in-network caching, name-driven routing, and receiver-initiated sessions, which can greatly enhance the way Internet resources are currently used, making support for a broader set of users with increasing traffic demands possible.
Abstract TCP congestion control has been designed to ensure Internet stability along with fair an... more Abstract TCP congestion control has been designed to ensure Internet stability along with fair and efficient allocation of the network bandwidth. During the last decade, many congestion control algorithms have been proposed to improve the classic Tahoe/Reno TCP congestion control. This paper aims at evaluating and comparing three control algorithms, which are Westwood+, New Reno and Vegas TCP, using both Ns-2 simulations and live Internet measurements.
Abstract Packet sampling techniques introduce measurement errors that should be carefully handled... more Abstract Packet sampling techniques introduce measurement errors that should be carefully handled in order to correctly characterize the network behavior. In the literature several works have studied the statistical properties of packet sampling and the way it should be inverted to recover the original network measurements. Here we take the new direction of studying the spectral properties of packet sampled traffic.
Abstract The TCP-friendly rate control (TFRC) algorithm has been proposed for supporting applicat... more Abstract The TCP-friendly rate control (TFRC) algorithm has been proposed for supporting applications such as video streaming or telephony over the Internet, where a relative smooth sending rate is of importance. The fairness and friendliness of TFRC over scenarios with multiple congested routers is evaluated. Results obtained using the ns-2 simulator show that while TFRC improves network utilisation with respect to Reno TCP, it exhibits a significant degree of unfairness and unfriendliness towards Reno TCP.
Abstract Long-term evolution (LTE) femtocells represent a very promising answer to the ever growi... more Abstract Long-term evolution (LTE) femtocells represent a very promising answer to the ever growing bandwidth demand of mobile applications. They can be easily deployed without requiring a centralized planning, to provide high data rate connectivity with a limited coverage. In this way, the overall capacity of the cellular network can be greatly improved. At the same time, the uncoordinated setup of femtocells poses new issues that require a deep and thorough analysis before spreading this technology worldwide.
Abstract Machine-to-machine (M2M) communications refer to the ability of devices to communicate w... more Abstract Machine-to-machine (M2M) communications refer to the ability of devices to communicate with each other without human intervention. Being arguably the most industrial branch of the emerging Internet of Things (IoT), it has some very stringent requirements on reliability, low-power and often delay. With cellular M2M today still being relatively power hungry, we concentrate in this paper on capillary M2M which is also more cost-efficient.
Abstract Wireless Multimedia Sensor Networks (WMSNs) are used in many application domains, such a... more Abstract Wireless Multimedia Sensor Networks (WMSNs) are used in many application domains, such as surveillance systems, telemedicine and so on. In order to ensure a broad deployment of such innovative services, strict requirements on security, privacy, and distributed processing of multimedia contents should be satisfied, taking also into account the limited technological resources (in term of energy, computation, bandwidth, and storage) of sensor nodes.
Abstract The additive increase/multiplicative decrease probing paradigm is at the core of TCP con... more Abstract The additive increase/multiplicative decrease probing paradigm is at the core of TCP congestion control. To improve the classic Reno/New Reno congestion control algorithms, the recent Westwood+ TCP proposes to substitute the multiplicative decrease phase with an adaptive decrease phase, which takes into account an end-to-end estimate of the available bandwidth obtained by filtering the stream of returning ACKs. This paper aims at evaluating the performance of Westwood+ TCP over the real Internet.
Abstract In recent years the new vision of data-centric networks has emerged as a natural way to ... more Abstract In recent years the new vision of data-centric networks has emerged as a natural way to satisfy user needs in the Future Internet. It is based on novel architectures oriented towards data sharing and delivering as opposite to classic host-to-host communications. Among several proposals, Content Centric Networking has been conceived as a very promising solution by the Palo Alto Research Center team.
Abstract Wireless ad-hoc networks represent an emerging technology, well suited for providing tem... more Abstract Wireless ad-hoc networks represent an emerging technology, well suited for providing temporary network connectivity where a wired infrastructure cannot be easily set up. The very popular 802.11 standard enables wireless ad-hoc networking, using the distributed coordination function (DCF) for multiple access to the shared radio channel.
Abstract A Selective Dropping Congestion Control (SDCC) algorithm is proposed in this work, for w... more Abstract A Selective Dropping Congestion Control (SDCC) algorithm is proposed in this work, for wireless multimedia sensor networks based on scalable multimedia encoding. SDCC, which has been designed by means of linear discrete time control theory arguments, can be applied in a fully distributed way. It periodically evaluates at each node the amount of data to drop, in order to control the level of the transmission queue, and then selects the packets to discard based on their relevance to the image quality.
Abstract—The 802.11 e working group has recently proposed inno-vative functionalities in order to... more Abstract—The 802.11 e working group has recently proposed inno-vative functionalities in order to support delay-sensitive multimedia applications, such as real-time voice and video, in Wireless Local Area Networks (WLANs). This paper proposes an innovative dynamic bandwidth allocation algorithm along with a measurement based CAC algorithm for providing delay guarantees to real-time media flows in IEEE 802.11 e networks.
Abstract: This paper proposes a new rate based congestion control algorithm that significantly im... more Abstract: This paper proposes a new rate based congestion control algorithm that significantly improves the utilization of planetary links with respect to classic TCP congestion control. Ns-2 simulation results have shown that the proposed algorithm provides significant goodput improvements with respect to New Reno, Reno Sack, Reno Fack, Vegas, and Westwood+ TCP in the presence of RTTs larger than 1s and smaller than 2000s and packet loss probability ranging from 0.0001 to 0.01
The Hybrid Coordination Function (HCF) has been recently proposed by the 802.11 e working group i... more The Hybrid Coordination Function (HCF) has been recently proposed by the 802.11 e working group in order to provide real-time services in Wireless Local Area Networks (WLANs). HCF is made of a contention-based channel access, known as Enhanced Distributed Coordination Access (EDCA), and of a HCF Controlled Channel Access (HCCA), which requires a centralized controller, called Hybrid Coordinator (HC).
Abstract The adoption of scalable encoders can improve P2P-TV performance in heterogeneous scenar... more Abstract The adoption of scalable encoders can improve P2P-TV performance in heterogeneous scenarios, where peers with different capabilities coexist. In fact, each peer could dynamically adapt the resolution of the audio/video signals to its computation capabilities and available communication resources. Despite these clear benefits, casting a scalable encoder in a P2P-TV system requires sophisticated scheduling strategies in order to maximize user satisfaction.
Abstract The main contribution of this paper is an end-to-end rate-based congestion control algor... more Abstract The main contribution of this paper is an end-to-end rate-based congestion control algorithm for unicast quality adaptive video streaming that we call Adaptive Rate Control (ARC). The algorithm is based on end-to-end estimation of both available bandwidth and queue backlog. ARC has been compared with the TCP-Friendly Rate Control (TFRC) algorithm via the ns-2 simulator. In particular, both single bottleneck and multi-hop scenarios with and without lossy links have been considered.
Nowadays, technology is mature enough to allow the production of multimedia wireless sensors, ie,... more Nowadays, technology is mature enough to allow the production of multimedia wireless sensors, ie, wireless nodes able to acquire and process audio/video signals. A Wireless Multimedia Sensor Network (WMSN) relies on a set of collaborating multimedia wireless sensors to provide distributed multimedia sensing services (see Fig. 1).
Recently, the 802.11 e Working Group (WG) has proposed the Hybrid Coordination Function (HCF), wh... more Recently, the 802.11 e Working Group (WG) has proposed the Hybrid Coordination Function (HCF), which has a HCF Controlled Channel Access (HCCA) and an Enhanced Distributed Coordination Access (EDCA), in order to provide QoS in WLANs. In this paper an innovative HCCA-based algorithm, which will be referred to as Power Save Feedback Based Dynamic Scheduler (PS FBDS) providing bounded delays while ensuring energy saving, has been developed.
Abstract TCP congestion control was designed and optimized for wired networks. During recent year... more Abstract TCP congestion control was designed and optimized for wired networks. During recent years, however, the popularity of wireless network infrastructures enabling ubiquitous Internet access, such as Universal Mobile Telecommunication System (UMTS), has grown considerably.
Abstract—Content-Centric Networking (CCN) is a promising data-centric architecture, based on in-n... more Abstract—Content-Centric Networking (CCN) is a promising data-centric architecture, based on in-network caching, name-driven routing, and receiver-initiated sessions, which can greatly enhance the way Internet resources are currently used, making support for a broader set of users with increasing traffic demands possible.
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