| 1. |
- Agüero, Ramón, et al.
(författare)
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RRM Challenges for Non-Conventional and Low-Cost Networks in Ambient Networks
- 2005
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Konferensbidrag (refereegranskat)abstract
- This paper presents an overview of the Radio Resource Management (RRM) functionalities needed for Non-Conventional and Low-Cost Networks. These types of networks are characterized by increased cooperation between different types of networks and providers and they are believed to play a fundamental role for future wireless network networking. The paper describes three specific concepts, which latter is used to identify new RRM challenges. In addition, it identifies the relation between the RRM challenges and the Ambient Networks architecture and functionalities, in particular the multiradio resource management functionality.
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| 2. |
- Dimou, Konstantinos, et al.
(författare)
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Generic link layer : A solution for multi-radio transmission diversity in communication networks beyond 3G
- 2005
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Ingår i: VTC2005-FALL. - 0780391527 ; , s. 1672-1676
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Konferensbidrag (refereegranskat)abstract
- Communication systems beyond 3G (B3G) will consist of a mixture of radio access technologies. For such systems the challenge is to provide a multi-radio access architecture that facilitates the interconnection of heterogeneous radio access networks and supports efficiently the various services. Achieving this interconnection in a transparent way for users and services requires extensions at link layer level. The Generic Link Layer (GLL), as proposed in the context of the Ambient Networks (AN) project addresses this challenge. The principal role of GLL within the AN multi-radio access architecture is to integrate different Radio Access Technologies (RATs) at the link layer and to facilitate their efficient interworking. A feature that is enabled by the use of GLL is termed multi-radio transmission diversity (MRTD). It implies a well-defined split of a data-flow over the available RATs; the main benefits thereby are gain in user QoS, in spectral efficiency and in robustness. In this paper we give the system architecture and the GLL functions required for the realization of MRTD. Then, the specific scenario of cooperation between UMTS and IEEE 802.11 is discussed.
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| 3. |
- Fernández, Fátima, et al.
(författare)
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Exploiting stream scheduling in QUIC : Performance assessment over wireless connectivity scenarios
- 2024
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Ingår i: Ad hoc networks. - : Elsevier. - 1570-8705 .- 1570-8713. ; 164
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Tidskriftsartikel (refereegranskat)abstract
- The advent of wireless technologies has led to the development of novel services for end-users, with stringent needs and requirements. High availability, very high throughput, low latency, and reliability are all of them crucial performance parameters. To address these demands, emerging technologies, such as non-terrestrial networks or millimeter wave (mmWave), are being included in 5G and Beyond 5G (B5G) specifications. mmWave enables massive data transmissions, at the expense of a more hostile propagation, typical for high frequency bands. Consequently, the inherent instability of the physical channel significantly affects the upper layers of the protocol stack, resulting in congestion and data losses, which might strongly hinder the overall communication performance. These challenges can be addressed not only at the link layer, but at any affected layer. QUIC is a new transport protocol designed to reduce communications latency in many ways. Among other features, it enables the use of multiple streams to effectively manage data flows sent through its underlying UDP socket. This paper introduces an implementation of priority-based stream schedulers along with the design of a flexible interface. Exploiting the proposed approach, applications are able to set the required scheduling scheme, as well as the stream priorities. The feasibility of the proposed approach is validated through an extensive experiment campaign, which combines Docker containers, the ns-3 simulator and the Mahimahi framework, which is exploited to introduce realistic mmWave channel traces. The results evince that an appropriate stream scheduler can indeed yield lower delays for time-sensitive applications by up to 36% under unreliable conditions.
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| 4. |
- Fernández, Fátima, et al.
(författare)
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Flexible Priority-based Stream Schedulers in QUIC
- 2023
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Ingår i: PE-WASUN 2023 - Proceedings of the International ACM Symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks. - : Association for Computing Machinery (ACM). ; , s. 91-98
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Konferensbidrag (refereegranskat)abstract
- The advent of mobile technologies has led to the development of novel services for end-users, with stringent needs and requirements. In the scope of 5G and Beyond 5G systems, non-Terrestrial networks are being considered to meet such demands, with special emphasis on high-speed communications and low latency. QUIC is a new transport protocol designed to reduce communications latency in many ways. Among other features, it enables the use of multiple streams to effectively manage data flows sent through its underlying UDP socket. This paper introduces an implementation of priority-based stream schedulers along with the design of a flexible interface. Exploiting the proposed approach, applications are able to set the required scheduling scheme, as well as the stream priorities. The feasibility of the proposed approach is validated through an extensive experiment campaign, which combines Docker containers and the ns-3 simulator to emulate different connectivity characteristics. The results evince that an appropriate stream scheduler can indeed yield lower delays for strict time-sensitive applications by up to 36% under unreliable conditions.
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| 5. |
- Johnsson, Martin, et al.
(författare)
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Network composition
- 2005
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Konferensbidrag (refereegranskat)abstract
- Network Composition is a concept that is being currently studied and under development in the Ambient Networks (AN) Project, a project that is sorted under the Wireless World Initiative (WWI), being part of EU's 6th framework program. Network Composition is a key concept in future interworking scenarios, which will be likely characterized by a prominent heterogeneity, in terms of subjacent technologies, available accesses, operators, etc. Hence, there is a need to provide means to allow these networks being dynamically interconnected through a uniform framework, so as to provide seamless and ubiquitous connectivity. The main aim of this paper is to highlight the need and potential benefits of this novel networking procedure, as well as setting its main aspects, in terms of required mechanisms.
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| 6. |
- Koudouridis, George, et al.
(författare)
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Feasibility Studies and Architecture for Multi-Radio Access in Ambient networks
- 2005
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Konferensbidrag (refereegranskat)abstract
- Ambient Networks is a new networking concept that targets forthcoming dynamic communication environments; characterized by presence of a multitude of different wireless devices, radio access technologies and network operators that can form instant inter-network agreements with each other. In order to facilitate such dynamically composed networks a Multi-radio Access (MRA) architecture has been devised consisting of Multi-Radio Resource Management (MRRM) and Generic Link Layer (GLL) functionality. One of the key objectives of the MRA architecture is the efficient utilization of the multi-radio resources by means of effective radio access selection mechanisms. In this paper the functions of MRRM and GLL and their role in multi-radio access selection are explained. In addition, the results from a series of evaluation studies are presented emphasizing the scenarios where MRA approach shows significant gains in the overall system performance. This work has been performed as part of the Ambient Networks project, an integrated project within the EU IST 6th Framework Programme.
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| 7. |
- Koudouridis, George, et al.
(författare)
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Multi-Radio Access in Ambient Networks
- 2005
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Konferensbidrag (refereegranskat)abstract
- Ambient Networks is a new networking concept that targets forthcoming dynamic communication environments; characterized by presence of a multitude of different wireless devices, radio access technologies and network operators that can form instant inter-network agreements with each other. In order to facilitate such dynamically composed networks a Multi-radio Access (MRA) architecture has been devised consisting of Multi-Radio Resource Management (MRRM) and Generic Link Layer (GLL) functionality. One of the key objectives of the MRA architecture is the efficient utilization of the multi-radio resources by means of effective radio access selection mechanisms. In this paper the functions of MRRM and GLL and their role in multi-radio access selection are explained. In addition, the results from a series of evaluation studies are presented emphasizing the scenarios where MRA approach shows significant gains in the overall system performance. This work has been performed as part of the Ambient Networks project, an integrated project within the EU IST 6th Framework Programme.
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| 8. |
- Lundsjö, Johan, et al.
(författare)
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A Multi-Radio Access Architecture for Ambient Networking
- 2005
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Konferensbidrag (refereegranskat)abstract
- The Ambient Networks concept targets forthcoming dynamic communication environments; characterized by presence of a multitude of different wireless devices, network operators and business actors that can form instant inter-network agreements with each other. In this paper we propose an architecture, including the concepts of Multi-Radio Resource Management and a Generic Link Layer, for efficient use of heterogeneous access technologies in such emerging scenarios.
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| 9. |
- Sachs, Joachim, et al.
(författare)
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Future Wireless Communication based on Multi-Radio Access
- 2004
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Konferensbidrag (refereegranskat)abstract
- In future we will see a multitude of wireless networking technologies deployed, based on a variety of radio access technologies (RATs) and standards. The availability of multiple access alternatives offers the capability of increasing the overall transmission capacity, providing better service quality and reducing the deployment costs for wireless access. In order to exploit this potential multi-access gain it is required that different RATs are managed in a co-operative fashion. This paper presents current research activities on different levels of co-operation between heterogeneous RATs. It introduces multi-radio access for ambient networks, which is based on the two concepts of multi-radio resource management and a generic link layer. These concepts provide a modular functionality which allows different levels of collaboration between different RATs.
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| 10. |
- Zverev, Mihail, et al.
(författare)
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Robust QUIC : Integrating Practical Coding in a Low Latency Transport Protocol
- 2021
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Ingår i: IEEE Access. - : Institute of Electrical and Electronics Engineers (IEEE). - 2169-3536. ; 9, s. 138225-138244
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Tidskriftsartikel (refereegranskat)abstract
- We introduce rQUIC, an integration of the QUIC protocol and a coding module. rQUIC has been designed to feature different coding/decoding schemes and is implemented in go language. We conducted an extensive measurement campaign to provide a thorough characterization of the proposed solution. We compared the performance of rQUIC with that of the original QUIC protocol for different underlying network conditions as well as different traffic patterns. Our results show that rQUIC not only yields a relevant performance gain (shorter delays), especially when network conditions worsen, but also ensures a more predictable behavior. For bulk transfer (long flows), the delay reduction almost reached 70% when the frame error rate was 5%, while under similar conditions, the gain for short flows (web navigation) was approximate to 55%. In the case of video streaming, the QoE gain (p1203 metric) was, approximately, 50%.
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