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A New Downlink Scheduling Algorithm Proposed for Real Time Traffic in LTE System

Mahfoudi M., EL Bekkali M., Najid S., Mazer S., EL Ghazi M.

International Journal of Electronics and Telecommunications

2015

Vol. 61, No. 4

409-414

The Third Generation Partnership Project (3GPP) has developed a new cellular standard based packet switching allowing high data rate, 100 Mbps in Downlink and 50 Mbps in Uplink, and having the flexibility to be used in different bandwidths ranging from 1.4 MHz up to 20 MHz, this standard is termed LTE (Long Term Evolution). Radio Resource Management (RRM) procedure is one of the key design roles for improving LTE system performance, Packet scheduling is one of the RRM mechanisms and it is responsible for radio resources allocation, However, Scheduling algorithms are not defined in 3GPP specifications. Therefore, it gets a track interests for researchers. In this paper we proposed a new LTE scheduling algorithm and we compared its performances with other well known algorithms such as Proportional Fairness (PF), Modified Largest Weighted Delay First (MLWDF), and Exponential Proportional Fairness (EXPPF) in downlink direction. The simulation results shows that the proposed scheduler satisfies the quality of service (QoS) requirements of the real-time traffic in terms of packet loss ratio (PLR), average throughput and packet delay. This paper also discusses the key issues of scheduling algorithms to be considered in future traffic requirements.

Indirect observation of rerouting phenomena in traffic networks – case study of Warsaw bridges

Kucharski R., Gentile G.

Archives of Transport

2014

Vol. 32, iss. 4

29--41

In this paper we propose estimation procedure in which traffic flows resulting from rerouting model are matched with traffic flows observed during unexpected events. We show practical value of observing a entire cut-set of the transportation network and propose theoretical closed-form formulation of estimation problem for the rerouting model. We apply proposed framework on field-data from Warsaw bridges to observe rerouting phenomena. Most importantly we observed that: a) around 20% of affected traffic flow reroutes, b) rerouting flows are increasing in time, c) drivers show strategic capabilities, d) and maximize their utility while rerouting. All of the which were hypothesized in Information Comply Model (Kucharski et. al., 2014) and are now supported with field observations.

Koncepcja dynamicznego wyznaczania przepustowości skrzyżowań i oceny warunków ruchu

Karoń G., Żochowska R.

Zeszyty Naukowe. Transport / Politechnika Śląska

2006

z. 62

257-266

Artykuł prezentuje koncepcję dynamicznego gromadzenia danych o ruchu na skrzyżowaniach. Opierając się na aktualnych metodach obliczania przepustowości skrzyżowań, zaproponowano wykorzystanie modelu strumieniowego baz danych do gromadzenia danych oraz dynamicznego wyznaczania przepustowości wraz z oceną warunków ruchu.

The conception of real-time traffic data collection at the intersections is a subject of the article. The actual methods of capacity and traffic condition estimation for three types of intersections have been described. The data stream system DSMS has been proposed for data collection and traffic characteristics estimation.