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- Ramazanali, Hawar, 1979-
(author)
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Managing Radio and Energy Resources in LTE-Based Military Training Networks
- 2017
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Doctoral thesis (other academic/artistic)abstract
- The number of wireless connected devices are growing exponentially and the importance of this research area is growing as well to meet the known and looming challenges and expectations. The 5:th Generation telecommunications standard is partly embodied by the Machine-to-Machine (M2M) and Internet of Things (IoT) technologies and standards to handle a big part of these devices and connections. An example within the IoT paradigm is military training systems where each system can consist of thousands of battery operated mobile devices and their shifting requirements shall be fullled in an energy-aware manner to increase battery operating times.Military training radio networks enables realistic combat training. The services and features provided in commercial telecommunications networks are desirable in these often proprietary and task specic networks, increasing capabilities and functionalities. To facilitate the current and future R&D of LTE based networks for adoption in military training networks and services this doctoral thesis intends to provide the starting ground for the energy-aware LTE based wireless communications. The thesis first presents general solutions on how to meet traffic deadlines in wireless networks for large number of nodes, and then continues with solutions for energy-aware LTE-based communications for the User Equipments (UEs).The work builds on the problem formulation how to provide energy-aware resource handling for LTE-based military training networks from where three research questions are derived. From the research questions we derive different hypotheses and then test these within the investigated area to answer the research questions.The contributions of this work are within areas of resource handling and power saving for mobile devices. In the first area an admission control using deterministic analysis is proposed fullling traffic requirements for military training mobile nodes. This admission control is enhanced for multiple-channel base stations, and evaluated using mobile nodes with different heterogeneous traffic requirements. In the second part energy-awareness is in focus for LTE/LTE-A based networks. The main power saving method for LTE/LTE-A UEs, Discontinuous Reception (DRX) mechanism, is evaluated and models for DRX in Idle and Connected state are proposed including metrics for wake-up delay and power saving. Additionally a mean queuing delay analysis is proposed for a variant of the Connected state DRX. Using these models and metrics, practical design guidelines for tuning of DRX parameters are proposed, including optimization of DRX parameters for either minimizing delay or maximizing power saving.
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| 2. |
- Udalov, Yu. P., et al.
(author)
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Monotectic Crystallization of Melts in the ZrO2–Al2O3 System
- 2006
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In: Glass Physics and Chemistry. - 1087-6596 .- 1608-313X. ; 32:4, s. 479-485
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Journal article (peer-reviewed)abstract
- —The morphology of the crystalline phases prepared at different cooling rates, temperatures, andcompositions of melts in the ZrO2–Al2O3system is investigated. It is established that both the quenched andslowly crystallized samples containing 35–70 wt % ZrO2have a submicron structure. Outside this concentrationrange, the ingots have a zonal structure: the peripheral region is formed by large baddeleyite crystals (at a ZrO2content higher than 70 wt %) or corundum crystals (at a ZrO2content lower than 30 wt %). This character ofthe crystallization confirms the presence of the phase separation (liquid immiscibility) region in melts of thissystem. A variant is proposed for the phase diagram of the system under investigation.
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