Self-tuning algorithms for the assignment of packet control units and handover parameters in GERAN

Esta tesis aborda el problema de la optimización automática de parámetros en redes de acceso radio basadas en GSM-EDGE Radio Access Network (GERAN). Dada la extensión del conjunto de parámetros que se puede optimizar, este trabajo se centra en dos de los procesos encargados de la gestión de la movilidad: el proceso de (re)selección de celda para servicios por conmutación de paquetes y el proceso de traspaso para servicios de voz por conmutación de circuitos

Low-power wide-area networks : design goals, architecture, suitability to use cases and research challenges

Previous survey articles on Low-Powered Wide-Area Networks (LPWANs) lack a systematic analysis of the design goals of LPWAN and the design decisions adopted by various commercially available and emerging LPWAN technologies, and no study has analysed how their design decisions impact their ability to meet design goals. Assessing a technology's ability to meet design goals is essential in determining suitable technologies for a given application. To address these gaps, we have analysed six prominent design goals and identified the design decisions used to meet each goal in the eight LPWAN technologies, ranging from technical consideration to business model, and determined which specific technique in a design decision will help meet each goal to the greatest extent. System architecture and specifications are presented for those LPWAN solutions, and their ability to meet each design goal is evaluated. We outline seventeen use cases across twelve domains that require large low power network infrastructure and prioritise each design goal's importance to those applications as Low, Moderate, or High. Using these priorities and each technology's suitability for meeting design goals, we suggest appropriate LPWAN technologies for each use case. Finally, a number of research challenges are presented for current and future technologies. © 2013 IEEE

Radio resource allocation and hybrid multiplexing of voice and data over IP in aGSM/GPRS cellular network

Abstract In this study, a first order investigation of the issue of resource allocation between circuit voice, packet data and packet voice was completed. The study was done with reference to the GSM / GPRS air interface. To study the allocation of resources, suitable traffic source models were developed to represent the nature of the traffic offered to the base station subsystem. Circuit voice and packet data were represented using Markovian arrivals and exponentially distributed holding times. Voice over IP was modelled using a two-state Markov modulated Poisson process. The base station subsystem was modelled as a continuous time controller with eight channels (one GSM / GPRS TDMA frame). The radio propagation environment was considered by means of a large-scale propagation model, which would merely alter the load presented to the developed simulator package. From the results of the simulations, it was found that insufficient data resources lead to similar packet delay regardless of the packet size. It was found that if capacity on demand is used, then the data resources could equal the load. In the case of sufficient data channels, with capacity on demand, additional channels have a greater effect on average delay than the probability of it occurring. Prioritisation of VoIP packets did not significantly alter the probability of delay but affected the average packet delay. Packet size had a greater effect on average delay than the probability of delay. In the case of all eight channels being used for VoIP and data, the combined load should not exceed seven erlang, indicating that a higher voice load could be supported with VoIP than with circuit switched voice

End-to-end key performance indicators in cellular networks

Masteroppgave i informasjons- og kommunikasjonsteknologi 2006 - Høgskolen i Agder, GrimstadThe continuing growth of customers taking advantage of the available services means greater load on the cellular network. Optimization is the key to ensure that the network can provide a reasonable level of service-quality. Service providers want to examine their network and be assured that their network is performing well. Teleca Wireless Solutions is a company that does this for service providers, and an end-toend test tool could be proven useful to examine the cellular networks overall performance from an end users point of view. To ensure that one has a tool that does this in an appropriate way, one must ensure, the application is based on testing the right key performance indicators for relevant services. Such services may be popular services like FTP and WEB. In this thesis, we have researched what affects the end users performance and performed practical end-to-end performance tests in cellular networks. Our goal is to define which key performance indicators are affecting the network’s performance at different network layers and for different services. We have paid special attendance to the high latency of the wireless links, and the delay introduced with the radio access bearer establishment. By measurements we have shown that the 3rd generation cellular network UMTS not surprisingly outperforms EDGE regarding commonly used services like HTTP/WEB and FTP. We have discovered that while TCP throughput is good when transferring large files over FTP, the high latency of the wireless link makes the HTTP performance bad compared to potential TCP throughput. Our work has concluded with which key performance indicators an end-to-end test application should measure for services as HTTP and FTP, to give an overall view of the cellular network’s performance. We have proposed enhancements to an already existing end-to-end test tool