Showing papers on "Mobile telephony published in 2000"

WCDMA for UMTS: Radio Access for Third Generation Mobile Communications

Abstract: From the Publisher: WCDMA for UMTS provides a complete picture of the Wideband CDMA (Code Division Multiple Access) air interface of the 3rd generation cellular systems - UMTS (Universal Mobile Telecommunications Systems). WCDMA is designed for multimedia communications including high quality images and video, and access to services with high data rates. These capabilities will create new business opportunities for manufacturers, operators and for the providers of content and applications. * Explains the key parts of the WCDMA standard and provides guidelines for its efficient use * Presents network dimensioning and coverage and capacity planning of WCDMA * Introduces radio resource management algorithms in the WCDMA network * Examines the coverage and capacity of WCDMA up to 2Mbps using numerous simulation results * Introduces the TDD (Time Divisions Duplex) mode * Discusses the co-existence of TDD and FDD (Frequency Divisions Duplex) and highlights their main differences Now includes the main modifications made to the 3GPP standard up until the end of 2000 and features the following new material: * Reference terminal classes * Current status of UMTS licensing * Capacity upgrade paths and capacity per km2 * Inter-frequency handovers and inter-system handovers to GSM * Antenna diversity gain measurements in the WCDMA experimental system Written by leading experts in the field, this practical approach to the key features in WCDMA will have wide-ranging appeal to Research and Development Engineers, Practising Engineers, Cellular Operators, Technical Managers and Students on Telecommunications courses.

A new multi-channel MAC protocol with on-demand channel assignment for multi-hop mobile ad hoc networks

Abstract: The wireless mobile ad hoc network (MANET) architecture has received a lot of attention recently. This paper considers the access of multiple channels in a MANET with multi-hop communication behavior. We point out several interesting issues when using multiple channels. We then propose a new multi-channel MAC protocol, which is characterized by the following features: (i) it follows an "on-demand" style to assign channels to mobile hosts, (ii) the number of channels required is independent of the network topology and degree, (iii) it flexibly adapts to host mobility and only exchanges few control messages to achieve channel assignment and medium access, and (iv) no clock synchronization is required. Compared to existing protocols, some assign channels to hosts statically (thus a host will occupy a channel even when it has no intention to transmit) some require a number of channels which is a function of the maximum connectivity, and some necessitate a clock synchronization among all hosts in the MANET. Extensive simulations are conducted to evaluate the proposed protocol.

Design, implementation, and evaluation of cellular IP

Abstract: Wireless access to Internet services will become typical, rather than the exception as it is today. Such a vision presents great demands on mobile networks. Mobile IP represents a simple and scalable global mobility solution but lacks the support for fast handoff control and paging found in cellular telephony networks. In contrast, second- and third-generation cellular systems offer seamless mobility support but are built on complex and costly connection-oriented networking infrastructure that lacks the inherent flexibility, robustness, and scalability found in IP networks. In this article we present cellular IP, a micro-mobility protocol that provides seamless mobility support in limited geographical areas. Cellular IP, which incorporates a number of important cellular system design principles such as paging in support of passive connectivity, is built on a foundation of IP forwarding, minimal signaling, and soft-state location management. We discuss the design, implementation, and evaluation of a cellular IP testbed developed at Columbia University over the past several years. Built on a simple, low-cost, plug-and-play systems paradigm, cellular IP software enables the construction of arbitrary-sized access networks scaling from picocellular to metropolitan area networks.

Traffic monitoring system and methods for traffic monitoring and route guidance useful therewith

Abstract: A traffic monitoring system for monitoring traffic including a population of users bearing a multiplicity of mobile communication devices, and methods useful for monitoring traffic, the system including a mobile communication network interface receiving, from at least one communication network serving the multiplicity of mobile communication devices, and storing, location information characterizing at least some of the multiplicity of mobile communication devices, and a traffic monitor operative to compute at least one traffic-characterizing parameter on the basis of the location information.

Disseminating messages among highly mobile hosts based on inter-vehicle communication

Abstract: We present an approach to distributing messages among highly mobile hosts in ad hoc networks. We focus on using direct radio communication between moving vehicles on the road that requires no additional infrastructure. Thus, the vehicles need to organize access to the radio channel in a decentralized manner. We derive the medium access control from the standard IEEE 802.11. Also, the vehicles use omnidirectional antennas implying that a sender can transit to multiple hosts simultaneously. As an example, we study a road accident that is reported to nearby vehicles. Simulations show that the quality of the proposed protocol by measuring how many vehicles inside a zone-of-relevance are informed under various conditions.

The future generations of mobile communications based on broadband access technologies

Abstract: The forthcoming mobile communication systems are expected to provide a wide variety of services, from high-quality voice to high-definition videos, through high data rate wireless channels anywhere in the world. The high data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band, and millimeter-wave. Broadband wireless channels have to be connected to broadband fixed networks such as the Internet and local area networks. The future-generation systems will include not only cellular phones, but also many new types of communication systems such as broadband wireless access systems, millimeter-wave LANs, intelligent transport systems, and high altitude stratospheric platform station systems. Key to the future generations of mobile communications are multimedia communications, wireless access to broadband fixed networks, and seamless roaming among different systems. This article discusses future-generation mobile communication systems.

Application-driven power management for mobile communication

Abstract: In mobile computing, power is a limited resource. Like other devices, communication devices need to be properly managed to conserve energy. In this paper, we present the design and implementation of an innovative transport level protocol capable of significantly reducing the power usage of the communication device. The protocol achieves power savings by selectively choosing short periods of time to suspend communications and shut down the communication device. It manages the important task of queuing data for future delivery during periods of communication suspension, and decides when to restart communication. We also address the tradeoff between reducing power consumption and reducing delay for incoming data. We present results from experiments using our implementation of the protocol. These experiments measure the energy consumption for three simulated communication patterns as well as three trace-based communication patterns and compare the effects of different suspension strategies. Our results show up to 83% savings in the energy consumed by the communication. For a high-end laptop, this can translate to 6‐9% savings in the energy consumed by the entire mobile computer. This can represent savings of up to 40% for current hand-held PCs. The resulting delay introduced is small (0.4‐3.1 s depending on the power management level).

Coupon delivery via mobile phone based on location

Abstract: A method for delivering coupons to consumers via mobile communication devices, based on location. The present invention includes an electronic database of merchant coupons. Users can then access the database by means of mobile phone, laptop computer, personal digital manager (PDA) or other mobile device. The user receives a menu of service preferences such as retail, dining, automobile service, lodging and entertainment and selects the desired services. Discount coupons for merchants in the user's vicinity are then sent to the user. The coupons are chosen based on the selected preferences and the user's location, which is determined according to the remote transmitting tower through which the user's signal is being sent.

Antenna arrays in mobile communications: gain, diversity, and channel capacity

Abstract: Are antenna arrays in mobile communications different from arrays in other applications? The answer is yes, sometimes, and it is the purpose of this paper to explain, in a tutorial fashion, when this is the case, and what this means for path loss in link calculations One aspect is the classical gain of an antenna, which we have to understand in a new way Another aspect is the possibility for two arrays, in a scattering environment, to create parallel channels, and thus, in effect, act as many independent antennas at the same time, carrying much more traffic over the same bandwidth

Method for emergency service access using a mobile phone

Abstract: A method for emergency service access using a mobile telephone (100). When an emergency situation arises and a caller enters an emergency number such as 911 from a locked mobile telephone, the mobile telephone compares the entered number, 911, with a list of emergency numbers stored in the memory of the mobile telephone. If the entered number is on the known emergency list, the mobile telephone immediately places the emergency call even though the telephone is locked. All other key combinations will be compared to a user defined access code previously stored in memory and if a match occurs, the mobile phone will be unlocked and ready for use. Otherwise, the mobile phone will remain disabled. If the emergency call is made when the subscriber is not the home system, an emergency contact record providing organization (170) transmits upon request, from the local MSC (130), ane emergency contact record to the PSAP (140).

TeleMIP: telecommunications-enhanced mobile IP architecture for fast intradomain mobility

Abstract: This article first surveys existing protocols for supporting IP mobility and then proposes an extension to the mobile IP architecture, called TeleMIP. Our architecture attempts to achieve smaller handoff latency by localizing the scope of most location update messages within an administrative domain or a geographical region. TeleMIP is intended for use in evolving third-generation wireless networks, and introduces a new logical entity, called the mobility agent, which provides a mobile node with a stable point of attachment in a foreign network. While the MA is functionally similar to conventional foreign agents, it is located at a higher level in the network hierarchy than the subnet-specific FAs. Location updates for intradomain mobility are localized only up to the MA; transmission of global location updates are necessary only when the mobile changes administrative domains and/or geographical regions. By permitting the use of private or locally scoped addresses for handling intradomain mobility, TeleMIP allows efficient use of public address space. Also, by reducing the frequency of global update messages, our architecture overcomes several drawbacks of existing protocols, such as large latencies in location updates, higher likelihood of loss of binding update messages, and loss of inflight packets, and thus provides better mobility support for real-time services and applications. The dynamic creation of mobility agents (in TeleMLP) permits the use of load balancing schemes for the efficient management of network resources.

“We will be reached”: the use of mobile telephony among Norwegian youth

Abstract: This article examines the use of mobile telephones by teenagers in Norway. The data for this study are based on two sources; first they draw on qualitative interviews with a sample of 12 families with teenagers in the greater Oslo area. In addition, they use a quantitative study of a national sample of 1,000 randomly selected teenagers. The data show that it is boys, most often those who work, that own mobile telephones. The qualitative analysis shows that the motives for owning mobile telephones are accessibility, safety and micro‐coordination. In addition, the mobile telephone serves as a symbol of emancipation. Metaphors surrounding the telephone allow for discussions of status construction and identification.

Wireless telephony over cable networks

Abstract: A method for providing mobile communication services to the home (50) of a subscriber includes coupling mobile communication signals into a broadband cable network (28). The signals are conveyed over at least a portion of the cable network to a transceiver (60) inside the home, which transmits the signals to a mobile telephone (62) in the home.

Visions of 4G

Abstract: As the Virtual Centre of Excellence in Mobile and Personal Communications (Mobile VCE) moves into its second core research programme it has been decided to set up a fourth generation (4G) Visions Group aimed at harmonising the research work across the work areas and amongst the numerous researchers working on the programme. This paper outlines the initial work of the group and provides a start to what will become an evolving vision of 4G. A short history of previous generations of mobile communications systems and a discussion of the limitations of third generation (3G) systems are followed by a vision of 4G for 2010 based around five elements: fully converged services, ubiquitous mobile access, diverse user devices, autonomous networks and software dependency. This vision is developed in more detail from a technology viewpoint into the key areas of networks and services, software systems and wireless access. It has been based upon a set of user scenarios that have been developed elsewhere in the Mobile VCE but which are summarised in the paper.

Third Generation Mobile Communication Systems

Abstract: From the Publisher: Get a clear, complete debriefing on the current status of the third generation radio interface technology now being standardized by the international body 3GPP. This timely new work, written by Europe's leading mobile communications researchers from manufacturing, operators, and academia, gives you a thorough explanation of the basic principles of multiple access technologies, including receiver algorithms, coding, and modulation, to help you stay up-to-date with the development of third generation systems. Much of the research presented here originated in the FRAMES (Future Radio Wideband Multiple Access System) Project, which was partly funded by the European Commission. It served as the basis for ETSI's decision to adopt W-CDMA/TD-CDMA as the air interface standard for third generation systems, as well as for the actual specification work in 3GPP. Featuring the contributions of several major industrial and academic players, this book delivers the basic principles and the analytical models for the UTRA TDD mode using TD/CDMA, and for the UTRA FDD mode using W-CDMA, allowing you to understand how this multiple access system fulfills UMTS requirements. Plus, you're presented with key advanced receiver algorithms; coding and modulation techniques; and Layer 2 issues including the UTRA architecture, protocol architectures, signaling protocols, and ARQ schemes. Included is an examination of TDD and FDD mode compatibility with GSM, and the methods used for calculating mobile station location within the coverage area. With this unique new book you get an invaluable integrated resource that examines the fundamentals and applications of the most important thirdgeneration mobile communications technologies.

The Global System for Mobile Communications Short Message Service

Abstract: This tutorial presents an overview of the Global System for Mobile Communications Short Message Service from the viewpoint of implementing new telematic services. The SMS offers the users of GSM networks the ability to exchange alphanumeric messages up to the limit of 160 characters. The tutorial is motivated by an acute absence of research publications in this field. The information gathered in the tutorial was required considering the increasing potential SMS offers for integration with existing messaging services and its ability to offer a successful replacement for the transmission control and Internet protocols as far as low-bandwidth-demanding applications are concerned. Initially, the tutorial gives an overview of the building blocks of GSM networks-the mobile station, base station, and network subsystem-and then emphasizes the SMS network and protocol architecture. The most widely used protocols for message submission are then introduced (text-based, SMS2000, ETSI 0705, TAP) and compared in terms of features provided and flexibility to handle extended alphabets or two-way messaging. Finally the tutorial outlines a summary of current and future issues for further development and research in the light of novel features for submission protocols and telematic services.

Method for providing mobile terminal with software keyboard suitable for language used in country where it is located

Abstract: A method for providing a mobile terminal with a software keyboard proper for the language of a country where it is located in a mobile communications network providing global roaming, comprises the steps of constructing a database on the information of multinational software keyboards in a server, transmitting the information on the location of the mobile terminal to the server, and transmitting the information on the proper software keyboard to the mobile terminal by ascertaining the country.

A system and method for the acquisition of automobile traffic data through wireless networks

Abstract: A system and method is disclosed for the acquisition of automobile traffic information through wireless data networks. In one embodiment, the method determines traffic conditions on roadways using a plurality of mobile communication devices. Traffic data is obtained from the mobile communication devices. The traffic data is provided to the server. The traffic data is analyzed to determine the traffic conditions.

Architecture and application of a dynamically reconfigurable hardware array for future mobile communication systems

Abstract: The evolving of current and future broadband access techniques into the wireless domain introduces new and flexible network architectures with difficult and interesting challenges. The system designers are faced with a challenging set of problems that stem from access mechanisms, energy conservation, error rate, transmission speed characteristics of the wireless links and mobility aspects. This paper presents first the major challenges in realizing flexible microelectronic system solutions for future mobile communication applications. Based thereupon, the architecture design of flexible system-on-a-chip solutions in the digital baseband processing for future mobile radio devices is discussed. The focus of the paper is the introduction of a new parallel and dynamically reconfigurable hardware architecture tailored to this application area. Its performance issues and potential are discussed by the implementation of a flexible and computation-intensive component of future mobile terminals.

Context-Aware Telephony Over WAP

Abstract: In this paper we introduce a novel approach to sharing context in order to enhance the social quality of remote mobile communication. We provide an analysis of how people start a conversation in situations where they meet physically, especially looking at the influence of the situation. This is then compared to the way remote communication is initiated using mobile phones. The lack of knowledge about the situation at the other end leads to the initiation of calls which are not appropriate to that situation. The solution we propose is to exchange context information before initiating the call. We implemented this concept using the Wireless Application Protocol (WAP). The application Context-Call offers a phone interface that provides information about the receiver when setting up a call. Based on that information, the caller can then decide to place the call, to leave a message or to cancel the call. Privacy issues that arise from this technology are discussed also.

Power conservation method for mobile communications device with two receivers

Abstract: A mobile communications device includes at least two receivers and a memory module. The power consumption of the mobile communications device is controlled by selectively awakening and sleeping the receivers as needed to ensure that the desired quality of reception to check the control channel for messages from an associated base station and to handle incoming communications is maintained. The mobile communications device may operate in single receiver mode or dual receiver diversity mode. In the dual receiver diversity mode, the mobile communications device may switch between one of a number of diversity combining techniques based on the quality of reception.

Messaging and status indication for wireless communication devices

Abstract: The present invention relates to a wireless communication system (100) having a storage device (112) for storing a list containing status information and identifiers for a plurality of previously identified wireless communication devices (102). A processor in a mobile communication device can retrieve and store a list containing status information and identifiers for a plurality of previously identified mobile devices from a remote server device and display them on the display screen thereof. By utilizing subscriber status information a user can determine the status of a mobile device associated with the intended recipient of a call or message prior to any attempt to contact that person. The interaction between the mobile device used by the user and the monitored mobile devices can be through a phone call or a text message, either of which can be initiated with minimal device interaction by using embedded contact information.

Universal Inbox: providing extensible personal mobility and service mobility in an integrated communication network

Abstract: Communication technology has been seeing rapid growth, characterized by new access networks (e.g. cellular, pager, wireless-IP) and end-devices (e.g. PDAs, two-way pagers, multi-model access devices). There have been several efforts at integrating services across such heterogeneity. However, little work has been done on identifying an underlying architecture for such an integration. We identify the requirements for this in the context of an integrated network with heterogeneous end-points. The Universal Inbox provides (a) generic data type transformation, (b) customizable redirection of incoming communication based on user preference profiles, and (c) device name mapping and translation. We present an architecture mapping these functionalities to reusable infrastructure components realized as Internet services. The unique feature of the architecture is its extensibility-it allows not only the integration of existing end-points but also extension in terms of the end-devices and novel services it can handle. We have implemented the Universal Inbox components in a test-bed setting, supporting a variety of devices and services: GSM cellular phones, voice-over-IP end-points, voice-mail, e-mail, instant messaging service, etc. With our architecture, building personal mobility and service mobility features and extending them to new end-points has been easy in concept and in implementation. The performance analyses with the initial implementation show that even the heavy-weight components can be scaled to accommodate a large user base.

Apparatus and methods for providing route guidance for vehicles

Abstract: A traffic monitoring system (Fig.1) for monitoring traffic including a population of users bearing a multiplicity of mobile communication devices, and methods useful for monitoring traffic, the system including a mobile communication network interface receiving, from at least one communication network serving the multiplicity of mobile communication devices, and storing, location information characterizing at least some of the multiplicity of mobile communication devices, and a traffic monitor operative to compute at least one traffic-characterizing parameter on the basis of the location information.

Video transcoding proxy for 3Gwireless mobile Internet access

Abstract: Transcoding proxies for mobile World Wide Web access have been developed. In the near future, wideband mobile communication systems such as IMT-2000 will emerge, and these proxies will have to cope with a variety of media such as video. In this article we identify issues involved in viewing a video stream in a mobile computing environment; to handle these issues, we propose a video transcoding system and its control method. These mechanisms provide stable transmission of video data and comfortable video viewing on user clients by estimating the communication conditions, client device capabilities, and user preferences.

Space-Time Processing for CDMA Mobile Communications

Abstract: List of Figures. List of Tables. Preface. 1. Introduction. 2. Basic Space-Time Aspects. 3. Aspects Influencing Space-Time Performance. 4. Space-Time Channel Models. 5. Smart Antenna Techniques. 6. Smart Antenna Performance. 7. Multiuser Detection. 8. Space-Time Coded Transmit Diversity for CDMA. Appendices. References. Index. About the Authors. Disclaimer.