Optimized network dimensioning and planning for WiMAX technology

In order to meet demands in mobile broadband and to bridge the digital divide a new technology, namely WiMAX, was introduced in 2004. However, in order to increase the financial return on the investment inWiMAX, service operators need to make every effort in designing and deploying the most cost-effective networks. This thesis presents a novel dimensioning technique for WiMAX technology which takes the dimensioning problem to a new level and produces more accurate results in comparison to the traditional methods. Furthermore, a novel decomposed optimization framework for the WiMAX network planning is introduced which subdivides the overall problem into three distinct stages consisting of the network dimensioning stage which besides the primary task of evaluating the financial requirements produces a good starting network solution for the subsequent stages (Stage 1), initial sectorization and configuration of the network (Stage 2) and final network configuration (Stage 3). The proposed framework also solves two fundamental problems, which are cell planning and frequency planning, simultaneously. The feasibility of the final network solutions are then evaluated by OPNET simulator.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Optimized network dimensioning and planning for WiMAX technology

In order to meet demands in mobile broadband and to bridge the digital divide a new technology, namely WiMAX, was introduced in 2004. However, in order to increase the financial return on the investment inWiMAX, service operators need to make every effort in designing and deploying the most cost-effective networks. This thesis presents a novel dimensioning technique for WiMAX technology which takes the dimensioning problem to a new level and produces more accurate results in comparison to the traditional methods. Furthermore, a novel decomposed optimization framework for the WiMAX network planning is introduced which subdivides the overall problem into three distinct stages consisting of the network dimensioning stage which besides the primary task of evaluating the financial requirements produces a good starting network solution for the subsequent stages (Stage 1), initial sectorization and configuration of the network (Stage 2) and final network configuration (Stage 3). The proposed framework also solves two fundamental problems, which are cell planning and frequency planning, simultaneously. The feasibility of the final network solutions are then evaluated by OPNET simulator

Unified WiMAX network design with service optimisation

This paper presents an automated framework for the operational planning of WiMax networks. The framework consists of a cell planning (network design) algorithm that selects and fully configures base station sites, together with an automatic frequency planning algorithm for assigning subchannels in an OFDMA scheme. Results are presented, which indicate that it is preferable to include the frequency planning directly in the cell planning process rather design the network and subsequently assign subchannels

A Staged Optimization Framework for Cost Optimized WiMax Network Design

WiMax was designed to deliver last mile wireless broadband access as an alternative to cable and DSL. Its scalability offers flexible solutions for a range of possible deployment scenarios and it promises advantages such as: lower cost, wider coverage and higher capacity. However, fixed and mobile wireless access faces a stiff competition in the market of broadband services and the drive to build a profitable cost-effective network puts enormous pressure on the network design procedure. Automated cell planning techniques have been well studied and widely used across a range of wireless telephony applications. This work introduces a new approach employing a staged optimization framework to break an entire problem into several tasks which can balance thevarious objectives more effectively across the optimization process. The success of the approach is demonstrated using practical problem based on planning of WiMax service for the city of Newcastle in the UK, showing the improvement compared to a single stage optimization technique

Experience with resorbable sonic pins for the attachment of distraction devices in posterior cranial vault distraction operations

Abstract Background: Distraction techniques are effective methods for the treatment of craniosynostoses when a significant gain of an intracranial volume is required. However, this technique raises some challenges at different stages of the treatment. While installing the distractors in patients with thin calvarial bone, there is a risk of dural damage from the titanium screws. The need for wide exposure of the devices and the screws during removal causes soft tissue damage and bleeding. Objective: This study aimed to evaluate sonic pin use in the distraction procedures. Methods: Resorbable sonic pins were used in 11 consecutive posterior cranial vault distraction procedures to attach distraction devices to the calvarial bone. Results: This method allowed for a less traumatic and faster removal of the devices without the risk of leaving foreign bodies in the wound. In three out of 11 cases on follow-up, displacement of proximal distractor footplate and partial relapse of distraction were detected. Though there was a smaller volume increase in these patients, all of them benefited clinically from the PCVD and did not require reoperations. Conclusions: This method allows a strong and stable attachment of the distractor devices to the cranial vault bones with a reduced risk of dural tears due to the screws. It also allows for easier and less traumatic device removal