Showing papers on "GSM published in 2011"

Accurate, low-energy trajectory mapping for mobile devices

Abstract: CTrack is an energy-efficient system for trajectory mapping using raw position tracks obtained largely from cellular base station fingerprints. Trajectory mapping, which involves taking a sequence of raw position samples and producing the most likely path followed by the user, is an important component in many location-based services including crowd-sourced traffic monitoring, navigation and routing, and personalized trip management. Using only cellular (GSM) fingerprints instead of power-hungry GPS and WiFi radios, the marginal energy consumed for trajectory mapping is zero. This approach is non-trivial because we need to process streams of highly inaccurate GSM localization samples (average error of over 175 meters) and produce an accurate trajectory. CTrack meets this challenge using a novel two-pass Hidden Markov Model that sequences cellular GSM fingerprints directly without converting them to geographic coordinates, and fuses data from low-energy sensors available on most commodity smart-phones, including accelerometers (to detect movement) and magnetic compasses (to detect turns). We have implemented CTrack on the Android platform, and evaluated it on 126 hours (1,074 miles) of real driving traces in an urban environment. We find that CTrack can retrieve over 75% of a user's drive accurately in the median. An important by-product of CTrack is that even devices with no GPS or WiFi (constituting a significant fraction of today's phones) can contribute and benefit from accurate position data.

From GSM to LTE: An Introduction to Mobile Networks and Mobile Broadband

Abstract: A new edition of Wiley's Communication Systems for the Mobile Information Society, from the same authorWireless systems such as GSM, UMTS, LTE, WiMAX, Wi-Fi and Bluetooth offer possibilities to keep people connected while on the move. In this flood of technology, From GSM to LTE: An Introduction to Mobile Networks and Mobile Broadband enables readers to examine and understand each technology, and how to utilise several different systems for the best results. This book contains not only a technical description of the different wireless systems available today, but also explains the rationale behind the different mechanisms and implementations; not only the 'how' but also the 'why' is focused on. Thus the advantages and also limitations of each technology become apparent.Offering a solid introduction to major global wireless standards and comparisons of the different wireless technologies and their applications, this new edition has been updated to provide the latest directions and activities in 3GPP standardization reaching up to Release 10, and importantly includes a new chapter on LTE. The new LTE chapter covers aspects such as Mobility Management and Power Optimization, Voice over LTE, and Air Interface and Radio Network.Provides readers with an introduction to major global wireless standards and compares the different wireless technologies and their applications The performance and capacity of each system in practice is analyzed and explained, accompanied with practical tips on how to discover the functionality of different networks Offers approximately 25% new material, which includes a major new chapter on LTE and updates to the existing material including Release 4 BICN in relation to GSM Questions at the end of each chapter and answers on the accompanying website (http://www.wirelessmoves.com) make this book ideal for self study or as course material

Overhead electric power line fault real-time monitoring system

Abstract: The present utility model relates to an overhead electric power line fault real-time monitoring system. The system comprises a wireless type electric power line fault indication sensor, a single mode base station, a dual mode base station, and a monitoring center. The wireless type electric power line fault indication sensor is provided with a first RF transmit-receive module, the single mode base station is provided with a second RF transmit-receive module, and the dual mode base station is provided with a third RF transmit-receive module and a GSM transmit-receive module. The wireless type electric power line fault indication sensor is respectively connected with the single mode base station and the dual mode base station in a data transmission way, the single mode base station is connected with the dual mode base station in a data transmission way, the GSM transmit-receive module is connected with an operator communication center in a data transmission way, and the operator communication center is connected with the monitoring center in a data transmission way. By adopting the system, the working state of the electric power line can be monitored in real time, fault positions can be accurately and rapidly determined, and the generated communication costs are cheap.

CellSense: An Accurate Energy-Efficient GSM Positioning System

Abstract: Context-aware applications have been gaining huge interest in the last few years. With cell phones becoming ubiquitous computing devices, cell phone localization has become an important research problem. In this paper, we present CellSense, a prob- abilistic RSSI-based fingerprinting location determi- nation system for GSM phones. We discuss the chal- lenges of implementing a probabilistic fingerprinting localization technique in GSM networks and present the details of the CellSense systemand how it addresses these challenges. We then extend the proposed system using a hybrid technique that combines probabilistic and deterministic estimation to achieve both high ac- curacy and low computational overhead.Moreover, the accuracy of the hybrid technique is robust to changes in its parameter values. To evaluate our proposed system, we implemented CellSense on Android-based phones. Results from two different testbeds, represent- ing urban and rural environments, for three differ- ent cellular providers show that CellSense provides at least 108.57% enhancement in accuracy in rural areas and at least 89.03% in urban areas compared to the current state of the art RSSI-based GSM localization systems. In additional, the proposed hybrid technique provides more than 6 times and 5.4 times reduction in computational requirements compared to the state of the art RSSI-based GSM localization systems for the rural and urban testbeds respectively.We also evaluate the effect of changing the different system parameters on the accuracy-complexity tradeoff and how the cell towers density and fingerprint density affect the system performance.

Radio coverage mapping for telecommunications network

Abstract: An arrangement for determining radio coverage provided by a telecommunications system to a user of a mobile device is disclosed. In the case of a GSM or UMTS mobile device, if the device is in the idle mode (step A) and if a paging operation is not scheduled (step B), the mobile device records and stores on the mobile device a characteristic of the radio coverage provided when the mobile device is at each of a plurality of locations visited by the user of the mobile device (step C). The arrangement also enables retrieval of the recorded and stored characteristic so that radio coverage provided to the device for the user at the locations can be evaluated. If the telecommunications system includes a plurality of networks, the mobile device will record and store the characteristic for each of the plurality of networks. The arrangement then enables the radio coverage provided by the respective networks to be evaluated, and an informed choice as to the best network for that particular user can be made.

WiZi-Cloud: Application-transparent dual ZigBee-WiFi radios for low power internet access

Abstract: The high density ofWiFi Access Points and large unlicensed RF bandwidth over which they operate makes them good candidates to alleviate cellular network's limitations. However, maintaining connectivity through WiFi results in depleting the mobile phone's battery in a very short time. We propose WiZi-Cloud, a system that utilizes a dual WiFi-ZigBee radio on mobile phones and Access Points, supported by WiZi-Cloud protocols, to achieve ubiquitous connectivity, high energy efficiency, real time intra-device/inter-AP handover, that is transparent to the applications. WiZi-Cloud runs mostly on commodity hardware such as Android phones and OpenWrt capable access points. Our extensive set of experiments demonstrate that for maintaining connectivity, WiZi-Cloud achieves more than a factor of 11 improvement in energy consumption in comparison with energy-optimized WiFi, and a factor of 7 in comparison with GSM. WiZi-Cloud has a better coverage than WiFi, and a low delay resulting in a good Mean Opinion Score (MOS) of 4.26 for a VoIP US cross-country communication.

Integrated technologies for solid waste bin monitoring system

Abstract: The integration of communication technologies such as radio frequency identification (RFID), global positioning system (GPS), general packet radio system (GPRS), and geographic information system (GIS) with a camera are constructed for solid waste monitoring system. The aim is to improve the way of responding to customer's inquiry and emergency cases and estimate the solid waste amount without any involvement of the truck driver. The proposed system consists of RFID tag mounted on the bin, RFID reader as in truck, GPRS/GSM as web server, and GIS as map server, database server, and control server. The tracking devices mounted in the trucks collect location information in real time via the GPS. This information is transferred continuously through GPRS to a central database. The users are able to view the current location of each truck in the collection stage via a web-based application and thereby manage the fleet. The trucks positions and trash bin information are displayed on a digital map, which is made available by a map server. Thus, the solid waste of the bin and the truck are being monitored using the developed system.

Methods and apparatus for access control client assisted roaming

Abstract: Methods and apparatus that allow a device to migrate wireless service across multiple wireless networks. In one exemplary embodiment, the present invention enables storing and switching between multiple Electronic Subscriber Identity Modules (eSIM), where each eSIM is specific to a different carrier network. By loading the appropriate eSIM, the user device can authenticate itself with the selected carrier, rather than roaming. During roaming operation, the user equipment can load one or more of the previously stored eSIMs. Selection of the eSIM can be done manually by the user or can be driven by the user equipment based on desired context; for example, based on carrier signal strength, cost-effectiveness, etc. Support for multiple radio technologies also allows universal connectivity for wireless devices, even spanning previously incompatible technologies such as GSM (Global Standard for Mobile Communications), CDMA (Code Division Multiple Access), etc.

On-Demand Resource-Sharing Mechanism Design in Two-Tier OFDMA Femtocell Networks

Abstract: Femtocells are a promising technology to improve network performance with short-range, low-power, and cost-beneficial small base stations. There will be many prospective benefits by applying the femtocell technique to wireless communication standards such as the Global System for Mobile Communications (GSM), WiMAX, and Long-Term Evolution. This paper studies two main design issues in orthogonal frequency-division multiple-access (OFDMA) femtocell networks, i.e., resource sharing and femtocell access control. Unlike other previous works, our presented analysis encompasses modeling wireless users' selfish characteristic and private traffic information. In addition, this provides a more comprehensive perspective on self-organizing femtocell networks, where users optimize their performance in a distributed manner. Our contributions are threefold: 1) We design a resource allocation mechanism that gathers selfish users' true private traffic information. 2) The proposed mechanism achieves efficient and fair resource sharing. 3) Based on the proposed mechanism, we create incentives for subscribers to share their femtobase stations with general users. This further improves the overall system performance.

On the equivalence of incremental and fixpoint semantics for business artifacts with guard-stage-milestone lifecycles

Abstract: Business artifacts (BAs, or artifacts) are used to model conceptual entities that are central to guiding the operations of a business, and whose content changes as they move through those operations. The recently introduced Guard-Stage-Milestone (GSM) meta-model for artifact lifecycles is declarative in nature, and allows concurrent execution of long-running (possibly human-executed) activities. Modularity is incorporated through the use of hierarchical clustering of activities. The GSM operational semantics is based on a variant of Event-Condition-Action (ECA) rules, which are used to control the start and termination of individual and composite activities. This paper introduces, in an abstract setting, three different and provably equivalent formulations of the GSM operational semantics. The semantics is specified in terms of how a single external event is incorporated into the current "snapshot" (i.e. full description) of a running execution of an artifact model. The "incremental" formulation corresponds to the sequential application of the ECA-like rules in response to the event; the "fixpoint" formulation characterizes the mathematical properties of pairs of snapshots corresponding to the full impact of incorporating the event; and the "closedform" formulation captures the fixpoint one in terms of first-order logic. The paper introduces a formally specified well-formedness condition on GSM models that guarantees the equivalence of the three formulations while permitting all of the commonly arising patterns for using GSM constructs to model business operations.

A Hidden Markov Model for Localization Using Low-End GSM Cell Phones

Abstract: Research in location determination for GSM phones has gained interest recently as it enables a wide set of location based services. RSSI-based techniques have been the preferred method for GSM localization on the handset as RSSI information is available in all cell phones. Although the GSM standard allows for a cell phone to receive signal strength information from up to seven cell towers, many of today's cell phones are low-end phones, with limited API support, that gives only information about the associated cell tower. In addition, in many places in the world, the density of cell towers is very small and therefore, the available cell tower information for localization is very limited. This raises the challenge of accurately determining the cell phone location with very limited information, mainly the RSSI of the associated cell tower. In this paper we propose a Hidden Markov Model based solution that leverages the signal strength history from only the associated cell tower to achieve accurate GSM localization. We discuss the challenges of implementing our system and present the details of our system and how it addresses the challenges. To evaluate our proposed system, we implemented it on Android-based phones. Results for two different testbeds, representing urban and rural environments, show that our system provides at least 156% enhancement in median error in rural areas and at least 68% enhancement in median error in urban areas compared to current RSSI-based GSM localization systems.

Tracking vehicular speed variations by warping mobile phone signal strengths

Abstract: In this paper, we consider the problem of tracking fine-grained speeds variations of vehicles using signal strength traces from GSM enabled phones. Existing speed estimation techniques using mobile phone signals can provide longer-term speed averages but cannot track short-term speed variations. Understanding short-term speed variations, however, is important in a variety of traffic engineering applications—for example, it may help distinguish slow speeds due to traffic lights from traffic congestion when collecting real time traffic information. Using mobile phones in such applications is particularly attractive because it can be readily obtained from a large number of vehicles. Our approach is founded on the observation that the large-scale path loss and shadow fading components of signal strength readings (signal profile) obtained from the mobile phone on any given road segment appear similar over multiple trips along the same road segment except for distortions along the time axis due to speed variations. We therefore propose a speed tracking technique that uses a Derivative Dynamic Time Warping (DDTW) algorithm to realign a given signal profile with a known training profile from the same road. The speed tracking technique then translates the warping path (i.e., the degree of stretching and compressing needed for alignment) into an estimated speed trace. Using 6.4 hours of GSM signal strength traces collected from a vehicle, we show that our algorithm can estimate vehicular speed with a median error of ± 5mph compared to using a GPS and can capture significant speed variations on road segments with a precision of 68% and a recall of 84%.

Mobile Attacks and Defense

Abstract: In this paper smartphones are discussed. Today's smartphone are more common than computers. In fact, smart phones are simply computers with extra hardware-namely, a GSM (Global System for Mobile Communications) radio and a baseband processor to control it. These extra features are great, but with the power they provide, there's also a threat. Today, smartphones are becoming targets of attackers in the same way PCs have been for many years. This paper focus on the security models of two smart phone operating systems: Apple's iOS and Google's Android. These two have a special place in my heart because I was the first to publicly exploit both of them.

Method for securing a computing device with a trusted platform module-tpm

Abstract: Methods, systems and computer program products for securing a computing device with data storage, power-on firmware—BIOS, geolocation and mobile data module—GPS/GSM, and a Trusted Platform Module—TPM, including establishing a shared-secret between the BIOS and the TPM, requesting the TPM to generate suitable encryption keys, namely for encrypting the data storage, supplying the user of the computing device suitable keys for external storage, calculating a hash-based message authentication codes over the BIOS, MBR, unique ID of the TPM, unique ID of the GPS/GSM module and unique ID of the BIOS; using user provided password and/or token device; using mobile data messages to secure the device if misplaced.

Design of smart home remote monitoring system based on embedded system

Abstract: This paper introduces a smart home system which could supervise household appliances remotely and realize real-time monitoring of home security status through mobile phone. The paper also describes the realization of system hardware and software in detail. This System combined embedded technique with GSM. Design adopted the Liod platform for master control system which core processor is PXA270 Xscale and singlechip expansion module to realize the information collection, analysis and processing. GSM module communicated to transmit all the information gathered by this system. Design also realized the video data acquisition, which can be transmitted via wireless or cable network to monitoring center to remotely understand the house condition. On the whole, through this system we can remotely and real-time monitor house status.

Wireless location using network centric location estimators

Abstract: A wireless location system is disclosed having one or more location centers for locating mobile stations (MS) based on, e.g., WIFI, CDMA, AMPS, NAMPS, TDMA, GPRS, and GSM. MS location requests can be processed via, e.g., Internet communication between a network of location centers. A plurality of MS locating technologies may be used, including those based on: two-way TOA and TDOA; pattern recognition; distributed antennas; and reduced coverage base stations. The system includes strategies for: automatically adapting and calibrating system performance according to environmental and geographical changes; automatically capturing location signal data for enhancing a historical data base retaining predictive location signal data; evaluating MS locations according to heuristics and constraints related to, e.g., terrain, MS velocity and path; and adjusting likely MS locations adaptively and statistically. The system is useful for emergency calls, tracking, routing, people and animal location including applications for confinement to and exclusion from certain areas.

A brief survey of radio access network backhaul evolution: part II

Abstract: In part I of this article we presented the design alternatives, issues, and challenges for designing backhaul for 2G (GSM, CDMA) and 3G (UMTS, CDMA2000) radio access networks (RANs). Part II extends the survey of backhaul technologies to address LTE-based RANs. We present various alternatives to deal with the specific requirements imposed by Evolved Packet System architecture on the backhaul design. In particular, we address handling of the X2 interface, network security through IPSec, distribution of frequency and phase synchronization, the impact of small cell design, self-organizing networks, and endend QoS management within backhaul. We also present a brief overview of active debates with respect to some of these design options as open issues, in particular the impact of LTE-Advanced requirements on LTE backhaul design.

Map-Based Location and Tracking in Multipath Outdoor Mobile Networks

Abstract: Technical enhancements of mobile technologies are paving the way to the definition of high-quality and accurate geolocation solutions based on data collected and managed by GSM/3G networks. We present a technique that provides geolocation and mobility prediction both at network and service level, does not require any change to the existing mobile network infrastructure, and is entirely performed on the mobile network side, making it more robust than other positioning systems with respect to location spoofing and other terminal-based security threats. Our approach is based on a novel database correlation technique over Received Signal Strength Indication (RSSI) data, and provides a geolocation and tracking technique based on advanced map- and mobility-based filtering. The performance of the geolocation algorithm has been carefully validated by an extensive experimentation, carried out on real data collected from the mobile network antennas of a complex urban environment.

System for implementing vehicle monitoring scheduling by GPS intelligent vehicle mounted terminal

Abstract: The invention relates to the intelligent on-board technical field, in particular to a system for realizing the monitoring and dispatching of vehicles by using a GPS intelligent on-board terminal; infrastructure such as a GPS global satellite positioning system, a mobile communication network and a data transmission network, etc. is used for establishing a system for dispatching, conducting and monitoring the vehicles; the invention mainly comprises a satellite positioning system, an on-board device, the mobile communication network, a network center, a data transmission network, a vehicle dispatching and monitoring management system and an electronic map; compared with the prior art, the invention adopts the GPS, GPRS, GSM, GIS and MIS techniques to realize the distribution and dispatching of tasks in enterprises and the management of vehicles; compared with the traditional semi-hand and semi-automatic management mode, the system leads the management of the enterprises to be normal and scientific, the operation process is real-time and effective, the electronic map adopts user-defined format and the data has confidentiality.

Octaband Internal Antenna for 4G Mobile Handset

Abstract: A compact internal antenna that is composed of a coupled loop with two branch lines is presented. The proposed antenna operates at two wide frequency bands (698 ~ 960 MHz/1710 ~ 2690 MHz) to cover octabands LTE 700/GSM 850/GSM 900/DCS 1800/PCS 1900/WCDMA 2100/LTE 2300/LTE 2500 for the 4G mobile handset. The proposed antenna is designed and fabricated on a support (polyester; er=3.2) with a limited volume, i.e., 7×11×46 mm3. The design methods and the measured results of the proposed antenna are presented in detail.

Hybrid GPS-GSM Localization of Automobile Tracking System

Abstract: An integrated GPS-GSM system is proposed to track vehicles using Google Earth application. The remote module has a GPS mounted on the moving vehicle to identify its current position, and to be transferred by GSM with other parameters acquired by the automobile’s data port as an SMS to a recipient station. The received GPS coordinates are filtered using a Kalman filter to enhance the accuracy of measured position. After data processing, Google Earth application is used to view the current location and status of each vehicle. This goal of this system is to manage fleet, police automobiles distribution and car theft cautions.

Fresh water real-time monitoring system based on Wireless Sensor Network and GSM

Abstract: The rapid development nowadays contributes to unbalance of natural ecological system which leads to changes of earth climates and natural resources such as fresh water quality. Limitation of human resource to do real-time monitoring and data collection regarding this environmental issue will lead a major problem to fresh water supplies at coming decades. This paper describes an approach of Wireless Sensor Network (WSN) application to do real-time data collection at the fresh water resources such as rivers, lakes or wetlands areas to obtain proper water quality parameters measuring. The WSN system is used as a platform to monitor the fresh water quality readings, deployed at distributed location which each nodes will able to interface with various water quality sensors. The system will use a green power source via harvesting the solar day light with optimized power management to enhance the long life operation at remote rural areas. Then, the collected data from each node will go to sub-base station as the device network coordinator and to the monitoring station server via GSM network. This system powered by PIC16F886 nano-watt MCU, with RF XBEE 802.15.4, ISM 2.4 Ghz module for each node while the Coordinator device integrated with GSM/GPRS modem and monitoring LCD.

Design and realization of a wearable multi-frequency RF energy harvesting system

Abstract: In this paper a novel wearable, triple-band ring-antenna, designed to harvest RF energy from GSM 900, GSM 1800 and WiFi sources available in the ambient, is introduced. It consists of a single annular ring suitable modified with appropriate slots to be operated as a resonant radiator at all the bands of interest. This choice allows us to achieve high radiation efficiency and circular polarization in compact dimensions, compatible with technology garments. A rectenna is then designed by the concurrent use of harmonic-balance technique and electromagnetic simulation to predict the real rectified power in general operating conditions. A multilayer configuration is exploited making use of textiles and flexible substrates whose integration issues are also discussed.

Analysis and Performance of a Low Cost SMS Based Home Security System

Abstract: The performance of the sensors of a low cost Short Message System (SMS) based home security system equipped with motion sensor, smoke detector, temperature sensor, humidity sensor and light sensors has been studied. The sensors are controlled by a microprocessor PIC 18F4520 through the SMS having password. The operation of the home security has been tested on Vodafone- Fiji network for emergency and feedback responses for 25 samples. The GSM experiment showed that it takes about 8-10s for the security system to respond the occupant and relevant civil authorities in case of emergency. It takes about 18-22s for the occupant to switch and monitor lights and appliances and then get feedback from home depending upon the network traffic.

Design and Implementation Of Vehicle Tracking System Using GPS

Abstract: Surveillance system using phone line for security and tracking. Based on the above statement, it is targeted that this project will serve as good indication of how important it is to curb car theft in the country. Surveillance is specified to car alarm system and the means of sending the data to the owner of the vehicle using SMS when the alarm is triggered. Due to the inefficient conventional car security system, the possibility of the car can be stolen is high. The main reason is that the alarm is limited to the audible distance. Somehow if there is another way of transmitting the alarm to the car owner ,tracking the vehicle ,knowing the exactly that the car is been stolen at the same time that is not limited to the audible and line of sight, the system can be upgraded. SMS is a good choice of the communication to replace the conventional alarm, because it can be done and does not require much cost. Although most of people know  GPS can provide more security for the car but the main reason people does not apply it because the cost. Advance car security system is too expensive. Cost for the gadget is too high. Beside that, people also must pay for the service monthly. Tracking systems were first developed for the shipping industry because they wanted to determine where each vehicle was at any given time. Passive systems were developed in the beginning to fulfill these requirements. For the applications which require real time location information of the vehicle, these systems can't be employed because they save the location information in the internal storage and location information can only be accessed when vehicle is available. To achieve automatic Vehicle Location system that can transmit the location information in real time. Active systems are developed. Real time vehicular tracking system incorporates a hardware device installed in the vehicle (In-Vehicle Unit) and a remote Tracking server. The information is transmitted to Tracking server using GSM/GPRS modem on GSM network by using SMS or using direct TCP/IP connection with Tracking server through GPRS. Tracking server also has GSM/GPRS modem that receives vehicle location information via GSM network and stores this information in database. This information is available to authorized users of the system via website over the internet. Keywords : GPS,GPRS,Sensors

Modelling and Dimensioning of Mobile Wireless Networks: From GSM to LTE

Abstract: This book is a must-read for all network planners and other professionals wishing to improve the quality and cost efficiency of 3G and LTE networksIn this book, the authors address the architecture of the 2/3G network and the Long Term Evolution (LTE) network. The book proposes analytical models that make the analysis and dimensioning of the most important interfaces, i.e. WCDMA or Iub, possible. Furthermore, the authors include descriptions of fundamental technological issues in 2/3 G networks, basic traffic engineering models and frequent examples of the application of analytical models in the analysis and dimensioning of the interface of cellular networks. The specific knowledge included in the content will enable the reader to understand and then to prepare appropriate programming softwares that will allow them to evaluate quality parameters of cellular networks, i.e. blocking probabilities or call losses. Additionally, the book presents models for the analysis and dimensioning of the Wideband Code Division Multiple Access (WCDMA) radio interface and the Iub interface, both carrying a mixture of Release 99 traffic (R99) and High-Speed Packet Access (HSPA) traffic streams. Finally, the analytical models presented in the book can be also used in the process of modeling and optimization of LTE networks.Key Features:Describes the architecture and the modes of operation of the cellular 2/3/4G systems and the LTE network Covers the traffic theory and engineering within the context of mobile networks Presents original analytical methods that enable their users to dimension selected interfaces of cellular networks Discusses models for the analysis and dimensioning of the Wideband Code Division Multiple Access (WCDMA) radio interface and the Iub interface, both carrying a mixture of Release 99 traffic (R99) and High-Speed Packet Access (HSPA) traffic streams Includes problems as well as an accompanying website containing solutions, software tools and interactive flash animations (http://wiley.teletraffic.pl) This book will be an invaluable guide for professional engineers (radio planning engineers, optimization engineers, transmission engineers, core network engineers, Service Management engineers) working in the areas of mobile wireless networks technology, not only in optimization process, but also in profitability assessment of newly implemented services (i.e. in NPV - Net Present Value analysis), and researchers and scientists. Advanced students in the fields of mobile communications networks and systems will also find this book insightful.

A SAW-Less GSM/GPRS/EDGE Receiver Embedded in 65-nm SoC

Abstract: A quad-band GSM/GPRS/EDGE receiver, implemented in 65 nm CMOS, complies with the ETSI standard without the need of external SAW filters. By exploring the properties of passive mixers and current-mode operation from RF to baseband, the receiver can achieve a SAW-filter-like selectivity with inexpensive on-chip components such as resistors and capacitors. In addition, to alleviate the linearity bottleneck at the LNA input stage, Class-AB self-bias LNTA is employed to break the conventional trade-off's among NF, linearity and power consumption. For single-to-differential conversion, external LC-CL baluns (instead of on-chip baluns) are used to balance the on-chip die and external BOM cost. This receiver solution is embedded as a part of a cellular phone SoC and achieves ; +1 dBm Out-of-Band Pι dB and consumes 58.9 mA. In FTA test, the receiver passes out-of-band blocker test with >; 4 dB margin.

GSM churn management by using fuzzy c-means clustering and adaptive neuro fuzzy inference system

Abstract: Churn management is important and critical issue for Global Services of Mobile Communications (GSM) operators to develop strategies and tactics to prevent its subscribers to pass other GSM operators First phase of churn management starts with profile creation for the subscribers Profiling process evaluates call detail data, financial information, calls to customer service, contract details, market details and geographic and population data of a given state In this study, input features are clustered by x-means and fuzzy c-means clustering algorithms to put the subscribers into different discrete classes Adaptive Neuro Fuzzy Inference System (ANFIS) is executed to develop a sensitive prediction model for churn management by using these classes First prediction step starts with parallel Neuro fuzzy classifiers After then, FIS takes Neuro fuzzy classifiers' outputs as input to make a decision about churners' activities

Indoor positioning using fm radio signals

Abstract: Location based services are becoming an indispensable part of the life. Wide adoption of the Global Positioning System in mobile devices, combined with Wi-Fi and cellular networks, have practically solved the problem of outdoor localization and opened a new market. This, however, is the case only for outdoors. There are numerous areas of ubiquitous computing, which require the knowledge of user position indoors. Awareness of user's location is important in such areas as smart environments, assisted daily living, behaviour analysis studies. Over the past years, a significant effort has been dedicated to development of indoor localization systems. The results vary in characteristics, performance, and cost. Despite the effort, the existing indoor positioning systems are still limited: they either require expensive infrastructure (UWB, ultrasound), have limited coverage (Wi-Fi, Bluetooth, RFID, DECT) or low accuracy (cellular networks). The cost of commercial systems is prohibitive for their wide adoption (Ubisense). The main objective of this thesis was to determine the feasibility of indoor positioning using FM radio signals, generated either by local transmitters or by broadcasting FM stations. The performance of FM localization cannot be simply predicted from other technologies, such as Wi-Fi or GSM, due to significantly lower frequencies (around 100~MHz vs. units of GHz) leading to differences in signal propagation. Moreover, FM represents a popular and well-established technology, readily available in many mobile devices. At the infrastructure side, broadcasting FM stations provide almost ubiquitous coverage, while short-range FM transmitters are available license-free from conventional electronics markets. The results indicate that indoor positioning using broadcasting FM stations outperforms in terms of accuracy both Wi-Fi and GSM indoor localization systems (for confidence levels up to 90% and in all cases, respectively). Due to the passive nature of the client devices, the system can be used in sensitive areas where local radio transmission, such as Wi-Fi or GSM, is prohibited for safety or security reasons. Finally, an FM receiver has significantly lower power consumption than a Wi-Fi module and provides 2.6 to 5.5 times longer battery life in localization mode.

A concept of GSM-based passive radar for vehicle traffic monitoring

Abstract: In this paper the passive radar used as a transmitter of opportunity GSM BTS stations has been proposed for vehicle traffic monitoring. The paper presents a feasibility study on using GSM signals for traffic control in different environments including urban areas, highways and small agglomeration roads. The initial analysis shows that such system can be successfully used to extract traffic parameters such as the average speed of vehicles and road capacity. Additionally, the presented GSM passive radar concept for vehicle traffic monitoring has been successfully verified using real-life signals recorded during a measurement campaign carried out at the Warsaw University of Technology.