Cellular Multihop Networks: State of the Art

This paper presents the summary of some research in the area of cellular multihop networks that contains the improvement in network performance also the difficulties and the complexities of the networks. The combination of two different networks, mobile cellular networks and WLAN ad hoc networks will be presented. The main purpose of the combination is to minimize the weaknesses of both network types when they are deployed separately. By having this combination then it is possible to provide higher mobility for WLAN ad hoc networks user and higher data transfer rate for cellular network users in multimedia applications. The cellular multihop networks will reduce blocking probability, balance the cells load and increase the network capacities. Although there are improvement on the performance of the combine networks, but there are additional aspects that should be considered seriously, especially for WLAN ad hoc users. Authentication, Authorization and Accounting (AAA) functions, the dynamic routing and relay path discovery, maintenance and security issues are aspects to be considered for cellular multihop network

Simulasi Sistem Penjadwalan Kereta: Studi Kasus Daop VIII Jawa Timur

Train rescheduling is often have to be made due to technical problems faced by the train that hold up the train to run on schedule or due to the addition of a new train. A simulation on train scheduling system can help out the train service company on rescheduling the train schedule. The simulation is made using Java language programming with queue rules that is usually used by the train service company. Based on the experiment on the system that was made on the overall class for the train rescheduling, 76 % of trains could have shorter trip time against the result of the simulation for GAPEKA (Grafik Perjalanan Kereta Api). The adjustment of train departure time is restricted to ± 30 minutes from the time regulated in GAPEK