Interferences in cellular wireless networks between the cells and subscriber stations have direct impact on available throughput capacities and pose main capacity limitations, especially in networks with full frequency reuse among all cells. More and more attention is focused on its minimization. The article introduces a new Coordinated Path Loss Approximation (CPLA) method, which dynamically estimates the path loss (PL) often also referred to as channel gain between each SS and cells on backhaul point-to-multipoint OFDMA based CWN. The method is usable for smart inter-cell synchronization where cells run in cooperative mode in order to avoid interferences.
COBISS.SI-ID: 9280596
The article presents basic WiMAX mesh mode operation and some of key mechanisms for WiMAX mesh networks based on IEEE 802.16 technologies. Basics of WiMAX mesh network design and operation are given. A comparative analysis is presented for selected centralized and distributed scheduling algorithms and guidelines for algorithm selection for WiMAX mesh network design is given for a range of typical performance criteria.
COBISS.SI-ID: 7937108
In this paper we give an overview of the existing and upcoming positioning methods in the mobile environment. With the advent of mobile technologies, increased usage and expansion of mobile devices, mobile services and applications, among them also the so called location-based services, are gaining an increased amount of attention. The user context is an important element of personalization of future information retrieval systems, applications and services. We briefly present our scheme that could be deployed to obtain the user profile and context. An important factor for determination of the latter is an accurate positioning of a user in the environment which can be done by using different methods. Therefore, we have prepared a survey of the existing and upcoming possibilities. We present the state-of-the-art positioning methods and general ideas behind them, however comparisons among them are hard to make. It seems a method that will work well both in the indoor and in the outdoor environments does not exist. Positioning in the indoor areas is due to the nature of the environment namely harder to obtain and the needed precision is higher. Therefore, a combination of methods will be needed for accurate positioning for the future services and applications.
COBISS.SI-ID: 8571220
The thesis addresses techniques, procedures and mechanisms for establishment of mesh WiMAX networks. Comprehensive analyses are given of centralized and distributed scheduling techniques for modern wireless networks based on WiMAX technologies and mesh networks principles. The core of the thesis is focused on scheduling algorithms. A detailed comparative performance analysis of established and experimental approaches is given, followed by a WiMAX mesh network design proposal and appropriate algorithm selection for various use-case scenarios and the belonging performance criteria.
COBISS.SI-ID: 7729748
In the recent years we have seen an explosion in the mobile data traffic driven by significant improvements in the user experience and the flat-rate data plans. Although this has increased operators’ data revenue, it has also led to the decoupling of usage and revenue. As the usage increases, costs can now rise faster than revenues, leading to lower margins. This shift in the network economics management means that cost control has now become the primary strategic focus of many operators. This issue becomes even more important when deployment of the LTE network is on its way. Mobile operators are currently upgrading their existing infrastructure to meet the traffic demands and to ensure a high quality of experience for all mobile broadband users but under current economic conditions this is challenging and costly. Is LTE a must for operator’s investments plans already this year? What is a driving factor for LTE deployments on 800 MHz – improved capacity or better signal propagation – and how are these issues considered when LTE is a planned technology for the digital divide bridging in the rural areas?
COBISS.SI-ID: 8567892