What Is Mobile Computing?

Mobile computing is a new technology that has emerged with the development of mobile communications, the Internet, databases, and distributed computing. Mobile computing technology will enable computers or other information intelligent terminal devices to realize data transmission and resource sharing in a wireless environment. Its role is to provide useful, accurate and timely information to any customer at any time, any place. This will dramatically change the way people live and work.

Basic concepts of mobile computing

Mobile computing is a multidisciplinary and wide-ranging emerging technology.

processor A hot area in computing technology research and is considered to be one of the four major technology directions that will have a profound impact on the future.

In 2003, the "Centrino" mobile computing technology developed by Intel Corporation is a mobile computing technology platform including a new Pentium-M processor, Intel 855 chipset and Intel PRO wireless network connection module. It will open up humans New milestones in the history of computing have brought unprecedented freedom and computing experience to people's lives and work. The application of this technology will also truly improve the portability of mobile terminals, and then spawn many new functional designs and application models. At the same time, new mobile computing technologies will bring new business opportunities to China's communications and computing industries. , Will promote the generation and development of new value chains.

Mobile computing uses a variety of radio frequency (RF) or cellular communications technologies to allow users to roam freely with their mobile computers, personal digital assistants (pDA), BP machines, and other telecommunications equipment. Mobile computer users using modems should also fall into this category, but they focus on wireless remote users. Mobile computer users rely on electronic messaging services to keep them in touch with the office wherever they go. Some vendors, Microsoft, are making special interfaces that support mobile users. For example, when a mobile user moves from one place to another, the desktop arrangement and files opened in the last meeting will be restored, as if the computer never turned off.

The so-called mobile computing is actually how to provide high-quality information services (information storage, query, calculation, etc.) to mobile users (including laptop computers, palmtop computers, mobile phones, pagers, etc.) distributed in different locations. The designed database system can provide data services to various user terminal devices safely, quickly and effectively.

With the rapid development of semiconductor technology, the processing power and storage capacity of high-end mobile computers have allowed it to manage databases that were not previously considered to be "super-large", supporting some complex database management tasks, as shown in the figure.

Mobile computing is a new technology that enables computers or other information devices to transmit data without being connected to a fixed physical connection device. It is predicted that by 2002, 80% of business users will require a remote or mobile solution. The role of mobile computing is to interact with the central information system and share the computing pressure of the central information system, so that useful, accurate and timely information can be provided to any user who needs it at any time and any place.

The emergence of the "New Workplace" model is driving the rapid development of the mobile and embedded computing markets. Mobile computing and embedded applications have become new growth points in the current database application field.

"New workspace" refers to new supporting equipment required by mobile workers due to business needs. The "New Workspace" solution supports new end-user roles: Data Miner (that is, a person who needs extensive and fast access to information); Job Owner (that is, all tasks that control the "work unit") Engineering and technical personnel); and mobile and flexible employees (mobile and flexible employees).

There are two types of computing concerned with mobile features-Mobile Computing and Mobile Computation. The former is concerned with calculations performed on wireless network-based mobile devices (such as laptops, PDAs, etc.); the latter is concerned with web-based mobile programs, such as Applets and Agents, which we collectively refer to as mobile computing. The communication characteristics of wireless networks and the natural distribution of Web geographic locations require computational mobility as an effective method to overcome or solve problems such as network bandwidth fluctuations, unstable connections, and long wait times.

The Internet provides a convenient and ubiquitous method for information transfer and data interaction. Many people are constantly changing their work locations due to business needs, so they are asking the information services department to provide a new end-user application structure-the "new work space." The combination of this new work model and the Web has brought new opportunities to the market. It can provide web-based data services suitable for mobile, decentralized, random access and other applications.

As the mobile computing market continues to expand, more and more thin clients and non-PC devices are joining the "new workspace" network, and many vendors are establishing broader thin client standards, applications, and foundations software. Therefore, the typical "new workspace" environment already includes not only PCs and laptops, but also existing "existing" equipment (mechanical devices, instruments, sensors and other discrete data acquisition equipment) and new equipment (pagers, Handheld / Palm devices and mobile phones).

Mobile Computing "Core" Technology

Mobile Computing Single-Core Processor

The core (main die), also known as the kernel, is the most important part of the CPU. The bulging chip in the CPU center is the core, which is manufactured by monocrystalline silicon in a certain production process. All calculations, receiving / storing commands, and processing data of the CPU are performed by the core. Various CPU cores have a fixed logical structure, and logical units such as L1 cache, L2 cache, execution unit, instruction level unit and bus interface will have a scientific layout. The processor has only one logical core.

Mobile Computing Dual Core Processor

A dual-core processor refers to the integration of two computing cores on one processor to improve computing power. The concept of "dual-core" was first proposed by high-end server vendors supporting the RISC architecture, such as IBM, HP, and Sun. However, due to the high price and narrow application scope of the RISC-based server, it did not attract widespread attention.

The concept of "dual-core" that has gradually heated up recently refers to the dual-core technology based on the X86 open architecture. At this

processor In terms of leadership, AMD and Intel are the two leading manufacturers. Among them, the two have different ideas. AMD has designed multicore support from the beginning. All components are directly connected to the CPU, eliminating system architecture challenges and bottlenecks. The two processor cores are directly connected to the same core, and the cores communicate at chip speed, further reducing the delay between processors. And Intel uses multiple cores to share the front-side bus. Experts believe that AMD's architecture makes it easier to implement dual-core or multi-core, and Intel's architecture will encounter bottlenecks in which multiple cores compete for bus resources.

Judging from the dual-core technology itself, what exactly is a dual-core? There is no doubt that the dual core should have two physical computing cores, and the design and application methods of these two cores have much to offer. According to the available data, the AMD Opteron processor was designed from the beginning with the addition of a second core. Both CPU cores use the same system request interface SRI, HyperTransport technology and memory controller, and are compatible with 90nm single core processing 940-pin interface used by the controller. But Intel's dual-core is simply packaged with two complete CPUs connected to the same front-side bus. It can be said that AMD s solution is truly dual-core, while Intel s solution is dual-core. It can be imagined that such two cores will inevitably cause bus contention and affect performance. Not only that, but also hidden dangers for future integration of more cores, because it will increase processor contention for front-side bus bandwidth and become a bottleneck for improving system performance, which is determined by the architecture. Therefore, it can be said that AMD's technology architecture has laid a solid foundation for achieving dual-core and multi-core. AMD's direct-connect architecture (that is, the CPU core is directly connected to external I / O through super-transmission technology, not through the front-side bus) and integrated memory controller technology, so that each core has its own cache available for use. Its own dedicated lane is directly connected to I / O, and there is no problem of resource contention. It is easier to achieve dual-core and multi-core. Intel has multiple cores that share the second-level cache and common use of the front-side bus. When the number of cores increases and the core's processing power increases, just like the large communities developed in the suburbs of Beijing, multiple communities use the same urban expressway. Encountered a traffic jam.

HT technology is a hyper-threading technology and a weapon of a glorious era for PENTIUM 4. Although it was rated as a failed technology, it has played a certain role in promoting P4. The dual-core processor is a newly launched processor category; The technology is to implement two logical processors in the processor, to make full use of processor resources, and a dual-core processor is to integrate two physical cores, which is a dual-core processor in a practical sense. In fact, the HT technology referred to in the Modern Computer magazine is like a chef who can cook with both hands at the same time and put one dish at a time on the table; a dual-core processor is like two chefs cooking two dishes at the same time. Take two dishes to the table. Obviously, dual-core processors have better performance. According to the technical point of view, the PENTIUM D 8XX series is not a dual-core processor in the actual sense, but only two processors are integrated, but the PENTIUM D 9XX is a dual-core processor in the actual sense, and the K8 is a dual-core processor in the actual sense .

Mobile computing dual core dual core

AMD and Intel's dual-core technology is also very different in physical structure. A

processor MD makes two cores on one die (chip) and connects them through a direct connection architecture, which has a higher degree of integration. Intel encapsulates two cores placed on different die (chips), so some people call Intel's solution "dual-core" and think that AMD's solution is really "dual-core". From the user's perspective, AMD's solution can make the dual-core CPU's pins, power consumption and other indicators consistent with single-core CPUs. Upgrading from single-core to dual-core requires no power supply, chipset, cooling system and motherboard. You only need to update the BIOS software, which is very beneficial to the investment protection of motherboard manufacturers, computer manufacturers and end users. Customers can leverage their existing 90-nanometer infrastructure to migrate to dual-core based systems via BIOS changes.

Computer manufacturers can easily provide single-core and dual-core versions of the same hardware, enabling customers who want to improve performance and maintain the stability of their IT environment to upgrade to dual-core without disrupting their business. In a high-density environment, customers' system performance will be greatly improved by migrating to dual cores while maintaining the same power and infrastructure investment. In the same system footprint, customers will obtain higher levels of computing power and performance by using dual-core processors.

Mobile Computing Index Technology

Mobile computing is a fusion of messaging technology and wireless communications. Companies like RAM Mobile Data have also joined, not only with the communications side, but also with user interface support. Typical users include domain service experts who need technical information, insurance representatives who make estimates, and salespeople who need information to make investment decisions. One way to get the information is to simply connect to the company database and conduct real-time queries, reducing the delivery of letters and phone calls. The mobile user only needs to send an e-mail message to the database server through a database query, and then the server generates a response and places the response in a mailbox that the user will retrieve later.

Mobile Computing Computing Features

Compared with distributed computing on the fixed network, mobile computing has the following main features:

(1) Mobility: The mobile computer can be connected to a node of a fixed network or other mobile computer through the MSS of the wireless unit in the mobile process.

(2) Diversity of network conditions: The networks used by mobile computers in the process of movement generally change. These networks can be either high-bandwidth fixed networks or low-bandwidth wireless wide area networks (CDPD), or even disconnected. status.

(3) Frequent disconnection: Due to the constraints of power supply, wireless communication costs, network conditions and other factors, mobile computers generally do not adopt a continuous networking work mode, but instead actively or passively disconnect and disconnect.

(4) Asymmetry of network communication: Generally, a fixed server node has a powerful transmitting device, and a mobile node has a weak transmitting capability. Therefore, the communication bandwidth and cost of the downlink and uplink are quite different.

(5) The power supply capacity of mobile computers is limited: Mobile computers are mainly powered by batteries and have limited capacity. Experience shows that the increase in battery capacity is much lower than the development speed of CPU speed and storage capacity during the same period.

(6) Low reliability: This is related to the reliability of the wireless network itself and the susceptibility to interference and insecurity of the mobile computing environment. Because mobile computing has the above characteristics, to construct a mobile application system, certain considerations must be made on the terminal, network, database platform, and application development. Terminals, networks and database platforms suitable for mobile computing already have more products from communication and computer companies (such as Lucent, Motorola, Ericsson, IBM, Oracle, Sybase, etc.) to choose from. The application must consider the optimization of queries and calculations related to location movement.

Mobile computing based on this method

There are two basic methods for mobile data communication: a packet-switched RF network charges customers based on packets. Cellular circuit-switched products It is built around existing cellular networks and charges based on connectivity time. A packet-switched wireless network has an advantage only when the transmission time is short, because it charges a fee for each packet that appears. Circuit-switched networks have an advantage when transferring long files or other long transmissions, because they charge customers based on how long they have been using the network. Packet radio communication companies include Ardisi (Lincolnshire, Illinois), RAM Mobile Data (Woodbridge, New Jersey), and Nextel (Lafayette, California). Ardis is a joint venture of IBM and Motorola. Ardis' signal penetration capability is specifically designed for large cities with many buildings. RAM Mobile Data is a collaboration between BellSouth and the RAM broadcaster. Hardware products include some products from Ericsson GE Mobile Communications, such as RF-enabled modems. Cellular Digital Packet Data (CDPD) is a competitor in the wireless market. It uses the idle time of cellular systems to transmit digital data at speeds up to 19.2Kbps, which is four times faster than other wireless services. DCPD is defined by an international alliance of cellular telecommunications companies and computer companies, including eight of the nine regional Be11 operating companies (RBOCs), McCaw Cellular Data, Contel Cellular, and GTE Mobilnet.

Mobile computing wireless mobile

Mobile computing application advantages

1. Comply with 802.3 Ethernet protocol, transparent to operating system, network protocols and applications;

2. Ethernet interface, plug and play, simple installation and easy debugging;

3. Support roaming within 90 kilometers per hour.

4. The speed of each access point is 11M, which can support the access of up to 256 workstations;

5. Multiple access points can constitute a base station throughput of 15Mbps;

6. Using 2.4G spread spectrum technology, no need to apply for a dedicated frequency point;

Applications of mobile computing

1. Mobile vehicle data communication system --- airport, port, military department, mobile bank, mobile ticket car, etc.

2. Communication systems for large-scale electronic industrial equipment --- industrial robots, automated three-dimensional parking systems, various loading and unloading equipment, etc .;

3. Network access system for handheld computers and laptops --- schools, hospitals, offices, homes, etc.

4. Real-time communication system for handheld data reading and writing equipment --- warehouses, supermarkets, airports, ports, etc.

Partial mobile application user roster

Warehouse handling mobile robot communication system

Chess board mountain project in Shenyang

Automatic stereo parking equipment communication system

Tianjin Port Fourth Company shore bridge work monitoring system

Transmission link of container loading and unloading bridge control system of Yantai Port Authority

Transmission link of Shanghai Gangjianghai Container Company's field bridge control system

Department of Real-time Database Management of Inventory Management of the Fuller Sports Products Company ^[1]

Mobile Computing Support Products

Apple, IBM, Intel, Hewlett-Packard, Novell, and others work with many wireless communications companies to provide comprehensive support to mobile users, such as data encryption, user authentication, and positioning systems that can discover the location of mobile users.

NetWare Connect is a remote communications platform that provides a connection point that supports 32 mobile users into the NetWare network. Users can dial in and access their desktop or NetWare server using different remote control packages. If needed, this service provides electronic software distribution systems that use e-mail, fax, and software that can be automatically upgraded when the user logs in. Connect is similar to the old NetWare asynchronous communication service (NACS) packet.

The "plug and play" capability of the network is implemented by many manufacturers, including Microsoft, Intel, etc. This feature allows users to cut off (but not destroy) the connection to the network and reconnect to the network later or elsewhere. When the user reconnects, the device automatically reconfigures according to the new location and restores the user's desktop system environment, including open applications and work. It eliminates the need to shut down files and download systems. Another feature is that when the system reconnects, the system will automatically check the user's e-mail.

Mobile computing

The advent of the era of ultra-mobile computing has brought about huge business opportunities, and it has become a battleground for processor manufacturers.

At the CES in 2007, Bill Gates personally put on display and demonstrated ultra-mobile devices. He called the future PC "ultra-mobile devices" and predicted that ultra-mobile devices would change the world in the future.

Intel also predicts that the mobile processor market share may be as high as $ 10 billion. The results of the third-party data monitoring agency ABI Research confirm Intel's view that the future of ultra-portable devices is bright. Data show that the total number of terminal equipment will increase from a small number of equipment in 2008 to 90 million units in 2012, and the Chinese ultra-mobile equipment market will reach 5 million units in 2011. Such a huge business opportunity has become a battleground for processor manufacturers.

The era of mobile computing ultra mobile is here

After entering 2008, Intel, AMD, and even traditional GPU maker NVIDIA have launched new models of processors to enter the ultraportable market and want to occupy a place. VIA Electronics, which has been cultivating in the ultra-mobile market for many years, also recently launched the Nano processor, which will be used in the portable PC market and emerging mobile devices.

For mobile devices, notebook computers are relatively heavy and bulky, which has been inconvenient as a mobile business application terminal for a long time. Similarly, when smart phones and PDAs are used in complex offices, the operability, computing performance, and information storage capabilities will become "short boards."

UMD (Ultra Mobile Devices) focuses on its mobility, and integrates a variety of consumer electronics functions such as communication, networking, GPS, and PC. In mobile commerce and mobile entertainment, this device can provide almost all mainstream applications. Therefore, some foreign experts even exclaimed: "The wolf is coming, the era of confrontation between the ultra-mobile platform and the laptop chamber has arrived."

Mobile computing balances performance per watt

From the desktop computing era to the mobile computing era to the ultra-mobile era, changes in user requirements have placed high demands on chip manufacturers. For ultra-mobile devices, due to different applications, the design concept of traditional processors is not applicable to ultra-mobile platforms. Not only do they need to be lighter in size and have better computing performance, but they also need low battery life and good battery life.

On a traditional desktop platform, a 35W processor can be called an energy-saving and low-power processor, but for ultra-mobile platforms, the gap between the two is extremely obvious. Take Intel's Atom processor for mobile network devices as an example. As the smallest processor in history, the CPU core area is only 25 square millimeters. Under the premise of processing speed of 800MHz to 1.86GGz, the average power consumption is only 0.16 to 0.22 Watts, standby power consumption is 0.08 to 0.1 watts, and thermal design power consumption is 0.65 to 2.4 watts.

How to reduce the power consumption of the processor under the premise of ensuring performance is the most needed design concept for ultra-mobile dedicated processors. For many years, Intel, AMD, and VIA have been working hard to reduce unit power consumption and improve computing performance in order to find the best balance of performance per watt.

In other words, performance and power consumption are two important parameters to be grasped at the same time. The trade-off between these two key parameters is not easy to handle, but it cannot be ignored by processor manufacturers. If you are more concerned about performance on the desktop platform, when you put too much emphasis on power consumption on the mobile platform, you are completely in a "strange circle".

Today, battery technology cannot progress, and some manufacturers place too much emphasis on the power consumption of ultra mobile platform processors, thinking that this will increase the availability of ultra mobile devices, but in the case of reduced performance, it will be like this Fatal flaws in design. This is undoubtedly the old way of PDA devices-no performance, no matter how strong the mobility is. Mobile processors, the word "balance" can meet the normal needs of users.

Development of mobile computing technology

Based on years of analysis and research on user needs, VIA has proposed a converged and balanced development strategy in response to the growing mobile needs of consumers. It requires that mobile performance be taken into consideration while mobile applications are also focused on. This type of ultra-mobile product does not require particularly strong computing performance, but particularly requires relatively long battery life and low heat generation on the move; this concept of balance was then incorporated into chip-level product design. A series of products launched by VIA have extremely high performance-to-power ratios. Under the circumstances that can meet user computing needs, the low power consumption characteristics make the product extend the battery life and generate less heat. The high integration of the product makes ultra-mobile devices thinner and more convenient to carry. Driven by VIA, Intel also launched the low-power processor Atom. The combined strength of the two provides a solid foundation for the industrialization of netbooks and the subsequent integration of netbooks and notebooks. In addition, with the promotion of VIA, more and more second-tier and even third-tier brands have joined this market, which makes the ultra-mobile field show more civilian temperament. In October 2008, VIA led GMB to promote the white-label ultra-mobile industry. Fuller competition, deeper integration of industrial resources, and greater support from upstream manufacturers have not only significantly reduced the price of ultra-mobile computing devices, but have also significantly reduced the price of traditional notebooks. The overall integration of product technology, the popularization of product prices, the arrival of the "big mobile computing" era seems so logical. Its arrival means that users' deep-level requirements for mobile computing have begun to be fully activated, and the door to industrial bureau change has been opened.

The meaning of mobile computing life

Not only will mobile computing free you from the office, it will also make your job easier and more efficient. By accessing data at any time, you can make smarter decisions, keep in touch with colleagues, and get important information. For example, without leaving the meeting site, a leading decision maker can immediately understand the inventory situation before negotiating an order with a customer, can issue an invoice without disrupting the meeting process, and can call employees. As a result, meetings become more efficient and flexible. Ideally, sales orders can be sent electronically to the office before the meeting ends.

This technology can be extended not only to your office, but also to your client's boardroom. When you re walking on the road, you just need to bring your laptop with wireless access to a public wireless hotspot (a coffee house, hotel or restaurant that provides public access to high-speed wireless networks) and you can connect to your Office network or internet.

The flexibility of mobile computing can directly affect job satisfaction. For example, with a network with Centrino mobile computing technology, you can spend more time outside the office while ensuring that you have access to email whenever you need it. With the latest freedom you get, you have the flexibility to do your work without having to do it in front of your office computer.

Some technology platforms are suitable for different types of employees, which type do you belong to?

Travelers

If you are a traveler and need to spend most of your time outside the office for sales call processing or work at a customer's office, you may need to keep in touch with the company via email and through Wi-Fi-based hotspots and networks Connect with the office network. Depending on the type of data you process, you can carry as little as 2 kilograms of Intel-based? Centrino? "Ultra-portable" laptop with mobile computing technology, which supports extended battery life and a compact form factor that brings superior performance and built-in Wi-Fi wireless connectivity. Or if you need a smaller device, can you use a PDA with a powerful Intel? Xscale processor and built-in Wi-Fi and / or Bluetooth wireless connection.

Mobile business people

If you are a mobile business person, you generally work in the office, but need to move from meeting to meeting or collaborating with colleagues from time to time. You will work with Centrino mobile computing-based laptops, stylus-driven tablets or "convertible" tablets to ensure you have immediate access to your data, the Internet and email.

Knowledge professionals

Knowledge professionals include lawyers, consultants, accountants, creative directors, or researchers who create value from information and need to use a fully functional wireless laptop computer via high-speed Wi-Fi or 802. 11 technology often communicates with the company s local area network ( LAN) and the Internet. However, unlike those small and portable laptops, these machines use 15 or even 16-inch TFT displays, powerful Intel Centrino mobile computing technology or mobile Intel Pentium 4 processor-M, built-in CD and DVD burning capabilities, large capacity Disk storage, multimedia speakers and many other features.

Mobile Computing Technology Products

The first revision of the Pentium M is called Dothan: Centrino technology has undergone a revision and a replacement. In the early Centrino, the core code of the Pentium M processor was Bannis, using 130 nanometer technology, 1MB high-speed secondary cache, 400MHz front-side bus. Centrino's first revision was in May 2004. A Pentium M processor with a 90-nanometer process Dothan core appeared. Its secondary cache capacity was provided to 2MB, and the front-side bus was still 400MHz. After the first revision, Dothan's core Pentium M processor quickly occupied the market, and Bannis' core products gradually withdrew from the mainstream. Although the Dothan core is popularly called the Centrino II in the market, Intel officials have not given a clear definition, and it is still called Centrino. That is, at the same time as Dothan Pentium M was launched, Intel changed the convention of defining processor numbers at the main frequency and replaced it with a series of numbers, such as: Pentium M 715/725, etc., which correspond to 1.5GHz and 1.6GHz main frequencies, respectively. In the first revision, the original 802.11b wireless network card has also been changed to support the 802.11b / g specification, and network transmission is provided from 11Mbps to 14Mbps.

The new generation of Centrino Sonoma: The replacement of Centrino is January 19, 2005. Intel officially released the new generation of Centrino mobile computing technology based on the Sonoma platform. Among its components, the Pentium M processor is upgraded to Dothan core, 90-nanometer process, 533MHz Bus and 2MB high-speed second-level cache, the processor number is Pentium M 730-770, the main frequency starts from 1.60GHz, and the highest is 2.13GHz. The 915GM / PM chipset allows Centrino to enter the PCI-E era. The 915GM integrates the Intel GMA900 graphics engine, which has greatly improved the multimedia performance of non-independent graphics notebooks. The 915PM / GM also supports single-channel DDR333 or dual-channel DDR2 400 / 533MHz memory, providing performance and reducing some power consumption. The new generation Centrino of the Sonoma platform has gradually become the mainstream of the market.

Centrino II: The new Intel Centrino mobile computing technology platform (codenamed Sonoma ), this platform is based on a 90nm process Dothan core (2MB L2 cache, 533MHz FSB) PentiumM processor, a new Aviso chipset , a new wireless module Calexico2 ( Intel PRO / Wireless 2915ABG or 2200BG Wireless LAN component) consists of three main components.

New technology added: New Intel Graphics Media Accelerator 900 graphics core, energy-saving 533MHz front-side bus, and dual-channel DDR2 memory support, helping to use systems with integrated graphics and mobile Intel 915GM high-speed chipset to get double graphics Improved performance. In addition, the new Intel Centrino mobile computing technology also supports the latest PCI Express graphics interface, which can provide up to 4 times the graphics bandwidth for high-end systems with discrete graphics. With system manufacturer support, options such as TV tuner, Intel High Definition Audio with Dolby Digital and 7.1 surround sound, personal video recorder, and remote control are also available, while continuing to enjoy the durable battery in Intel Centrino mobile technology computing Use time advantage. Features that help manufacturers achieve durable battery life include: Display Power Save Technology 2.0, low-power DDR2 memory support, and enhanced Intel SpeedStep technology. ^[2]

SaaS Mobile Computing SaaS

SaaS Introduction to mobile computing SaaS

SaaS is a new software application model. It provides software services in the form of software rental and online use. And this service should be updated at any time with the update of the software version (forever Beta, patch at any time). The latest and best user experience, and without any maintenance and upgrade by the user, the customer can order the required application software services according to their actual needs, and pay the manufacturer according to the amount and time of the ordered service.

Mobile Computing Features

1.Network structure of mobile computing environment

Mobile computing has emerged with the development of wireless communications, the Internet, databases, distributed computing, and other fields. It is based on wireless communications and expands the communication functions of computing devices such as handheld computers, PDAs, or the computing functions of communication devices such as Mobile phone. It mainly solves the problem of access to different networks and seamless computing, and provides the ability to exchange and process information anytime, anywhere.

The mobile computing environment consists of terminals, servers, and networks.

2. Network elements in a mobile computing environment

The entities on the terminal side are mainly various mobile terminal devices such as portable notebooks, palmtop computers, PDAs, smart phones, and cell phones. Different equipment resources and processing capabilities on the terminal side pose challenges to enjoying free-wheeling network services. The basic constituent elements of the terminal-side application environment include the operating system of the mobile data terminal, digital rights management of the application management ring, and interface procedures.

The server accepts the request from the client, that is, the terminal, completes the corresponding service processing function according to the requirements, and returns the result to the terminal. The server side generally exists in the wired network and focuses on the completion of resource organization, business processing, and corresponding service support functions, which mainly include basic support functions such as billing, security, business management, and service quality.

Mobile communication in the mobile computing environment not only refers to the current GSM, CDMA, 3G networks, but the network carrying environment for mobile computing includes the traditional meaning of the Internet, data networks on mobile bearer networks, and various micronets, such as home terminals Network environment with multiple terminal modes such as network, Ad hoc, P2P.

3 , network support capabilities of mobile computing environment

At present, the networks of the mobile computing environment include mobile data networks such as GPRS, EDGE, CDMA2000 1X / EVDO, and 3G that support mobile data services. There are mainly wireless access technologies and wireless access networks such as WLAN and WiMax that support nomadic computing. Bluetooth for handheld computers and PDAs to access the internet.

Mobile computing combined

From the operator's perspective, SaaS in the mobile computing environment:

1. The rapid increase of network bandwidth in the mobile computing environment provides a better technical foundation for the success of the SaaS model;

2. The improvement of multi-user database access security mechanism has eliminated the major concerns of enterprise customers;

3. Load balancing and dynamic database partitioning technology ensure the scalability of the system;

4. The research results of SaaS software maturity model can help to improve user experience and user stickiness;

5. The improvement of mobile terminal resources, processing power, and security will definitely liberate network-side servers to a great extent.

In short, the development of technology has promoted the formation and healthy development of the SaaS industry; the future is bound to continue to improve and strengthen the computing capabilities of mobile terminals, continuously improve the storage capabilities of mobile terminals, strong mobile network coverage and broadband mobile networks All of these will surely make SaaS in the mobile computing environment develop faster, and thus provide users with services more conveniently. Therefore, as mobile communication gradually penetrates people's lives and provides a mobile access network computing environment at any time and anywhere, it will vigorously promote the development of SaaS. At the same time, the development of SaaS will impact And other technologies put forward new requirements. ^[3]

Centrino technology for mobile computing

Centrino Mobile is the brand name of Intel s wireless mobile computing technology introduced on March 12, 2003 for notebook computers. Centrino: An abbreviation of the words Centre and Neutrino. It consists of three parts: mobile processor (CPU), related chipset and 802.11 wireless network function module. The Centrino brand is the first time that Intel has named a series of technologies under one name.

Intel's Centrino mobile computing technology is an innovative technology used in next-generation notebook computers. The laptop equipped with this technology will free users from the constraints of cables and truly work, study, relax and surf the Internet while on the move. And while increasing battery life, notebooks will also become thinner and lighter. This innovative technology not only brings new performance and low power consumption to the notebook system, but also integrates wireless communication and security functions into the local chip. From the perspective of product entities, Centrino mobile technology consists of three parts, namely Centrino technology by chipset and mobile.

Mobile Computing Book Information

Title: Mobile Computing

Author: Zhang dry

Publisher: Science Press

Publication time: April 2009

ISBN: 9787030243539

Folio: 16

Price: 45.00 RMB

Introduction to mobile computing content

The mobile computing technology introduced in "Mobile Computing" is novel, covers a wide area, has a large amount of information, and is highly practical. It is convenient for graduate students, teachers, and senior undergraduates to learn and reference. It is also suitable for mobile computing and related field researchers and engineers Technician reading. Pervasive service-oriented mobile computing technology is a fusion of multiple technologies such as computing, network communication, and digital media. It integrates information space with the physical space in which people live, so that computing, network communication and digital media become like water, electricity The necessities of life, like air, have revolutionized every aspect of people's life and work. The mobile computing technologies involved in "Mobile Computing" include pervasive service methods, mobile computing environments, seamless migration, context awareness, mobile communication protocols, mobile information fusion, mobile computing platforms, and mobile application scenarios.

Mobile Computing Book Catalog

Foreword

Chapter 1 Introduction

Chapter 2 Universal Services

Chapter 3 Mobile Computing Environment

Chapter 4 Seamless Migration

Chapter 5 Situational Awareness

Chapter 6 Mobile Communication Protocol

Chapter 7 Mobile Information Fusion

Chapter 8 Mobile Computing Platforms

Chapter 9 Mobile Applications

references

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