This paper deals with quality of service (QoS) provision in wireless IP networks. QoS provision is particularly challenging in wireless networks, where network resources are generally limited, variable over time and shared. In the design of possible measures to assure QoS one should consider that standardization is well established for the network layer Internet Protocol and for many underlying technologies of frequent use (e.g. IEEE 802.11, BLUETOOTH or HIPERLAN II). Therefore, as far as research on QoS is concerned, there is little room in both the IP and the link-layers for improved IP over wireless interfaces. In this paper we illustrate a solution in which an intermediate Wireless Adaptation Layer (WAL) is transparently interposed between the IP layer and specific link-layer technologies as a solution to provide QoS. The WAL addresses two main issues: (i) compensation for channel impairments in different platforms in order to enhance wireless channel reliability and (ii) implementation of traffic control and packet scheduling mechanisms to satisfy bandwidth and delay requirements, as well as to enforce a general principle of fairness among the IP associations contending for network resources and achieve optimal exploitation of transmission capacity. The WAL consists of a set of modules, each one in charge of a specific task, which can be enabled or disabled depending on the specific network environment. The novelty of the WAL approach is its capability of adapting itself to different wireless interfaces selecting performance enhancing modules for specific networks. This requires to modify the standard TCP/IP protocol stack by introducing an intermediate layer between the IP layer and the Data Link layer, with performance enhancement purposes. This paper focuses on two modules in particular, namely a traffic control module, which is in charge of performing congestion control and channel state dependent scheduling (CSD) packet scheduling, and a forward error correction (FEC) module, which compensates for channel impairments. This paper presents the proposed architecture provided with these modules and reports some measurements and simulations highlighting benefits resulting from the use of such modules.
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Francesco Delli Priscoli was born in Rome in 1962. He graduated in Electronic Engineering “summa cum laude” from the University of Rome “La Sapienza” in 1986. He received the Ph.D. in system engineering from the University of Rome “La Sapienza” in 1991. From 1986 to 1991 he worked in the “Studies and Experimentation” Department of Telespazio (Rome). Since 1991 he is working for the University of Rome “La Sapienza” (from 1991 to 2001 as a Researcher and since 2001 as an Associate Professor) where, in October 2004, he obtained the qualification of “Full Professor”. At present, it holds the courses “Automatic Controls”, “System Theory”and “Network Control and Management”. In the framework of his activity, he researches in the nonlinear control theory and in the area of control-based resource management procedures for the third and forth generation of mobile systems. He is the author of about 150 technical papers on the above topics appeared on major international reviews (about 50) and conferences (about 100). In 2000 he has been scientific consultant for the Italian Council of Ministers in the framework of the auction for the assignment of the Italian Universal Mobile Telecommunication System (UMTS) licensees. He is an associate editor of Control Engineering Practice and a member of the IFAC Technical Committee on “Networked Systems”. He is/has been scientific responsible, for the University of Rome “La Sapienza”, of 14 projects financed by the European Union (fourth, fifth and sixth framework programmes) or by the European Space Agency (ESA), dealing with resource management for UMTS and broadband terrestrial and satellite wireless systems. He is also a project evaluator for the European Commission.
Tiziano Inzerilli graduated in Electronic Engineering with 110/110 cum laude in April 2000 at the University of Rome “La Sapienza” defending a thesys on wireless Internet. He received a Ph.D. in Computer Engineering at the University of Rome “La Sapienza” in the year 2004. He is currently holding a class of Fundamentals of Computer Science for the degree course of electronic engineering at the university of Rome, La Sapienza. He has coordinated activities of the University of Rome within the fifth and sixth research framework since year 2000. Namely, in the year 2000 joined the WINE and BRAHMS projects focused on broadband wireless and satellite access respectively, within the EU IST priority. Working in the WINE projects he contributed to QoS provision through the design of a traffic control module for the WINE architecture. He also designed a protocol for intra-domain mobility management in the Internet. As regards to the BRAHMS project he was mainly committed in the design of broadband-access Internet architecture for satellite communications. In the year 2002 entered the SATIP6 project continuation of the BRAHMS project. In the European 6FP has been participating to the DAIDALOS integrated project and working on design and development of service discovery in pervasive networks. During the participation of EU projects and as a result of his research activity during the Ph.D. he published and presented several papers in international conferences and magazines.
Luis Muñoz is associate professor at the University of Cantabria. He received a degree and a Ph.D. in telecommunications engineering from the Technical University of Cataluña (UPC), Spain in 1990 and 1995, respectively. He joined the Communications Engineering Department in 1990 where he has been involved in different national and international projects, the latter within the ACTS and IST programmes, related to voice and data transmission over wired and wireless infrastructures. His current research interests lie in the field of wireless personal area networks.
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Priscoli, F.D., Inzerilli, T. & Muñoz, L. QoS Provisioning in Wireless IP Networks. Wireless Pers Commun 37, 23–39 (2006). https://doi.org/10.1007/s11277-006-1575-4
- wireless IP
- traffic control
- CSD packet scheduling
- link reliability
- TCP error correction