understand the 3G network status in China
understand the policies and specifications of operators in China
understand the behavior habits of end users in China
have a deep understanding of traditional mobile value-added services such as SMS,MMS,IVR and WAP
have working experience in internet and e-commerce projects
3G product operators
understand the 3G market status quo
know well-known domestic companies.
familiar with payment methods of various 3G products
application engineer of Windows Mobile platform
understanding of Windows Mobile
mastering event-driven model and message response mechanism
mastering core API development
mastering graphic design of smart devices
mastering multithreading and multi-process
mastering data storage
mastering data communication technology of windows mobile.
master the development of Windows Mobile games
master the programming related to Windows Mobile devices
Symbian platform application engineer
master the Symbian SDK and its development environment, the three types of Symbian binary code, the use of packaging and publishing tools, basic types, descriptors and dynamic arrays, and the exception handling and cleaning mechanism of Symbian. Text display and font use, UI component use, files, streams and storage
Realize the entertainment application software Constellation Luck based on Symbian platform, and users can see the corresponding constellations and various calculation indexes by inputting their own birthdays.
advanced graphics programming, network application development, multimedia application development, Bluetooth application and system core programming; Realize the automatic alarm clock, schedule prompt, display the daily health information of users and customize the news information of mobile phones.
Java ME platform application engineer
has a good command of Java language overview, classes, objects, class inheritance, abstract classes and interfaces, array, collection development, file access and Swing UI design. Implementation of map editor
MIDP1. development process, UI design package, RMS data warehouse, MIDP2. development, creation of game animation and basic process of developing games. Realization and optimization of game map, background scrolling technology, in-depth use of clipping area, realization of character animation, collision detection technology of characters and scenes, and reading of map files. Write an example of ACT game, realize the map, characters and props in the game, realize the switch of levels, and realize the collision detection in the game.
Java programming for large databases, JDBC access to Oracle database, and Hibernate access to database. Java multithreading technology, Java network programming, NIO programming, Java Web development technology. The development of MMORPG game realizes a large-scale multiplayer online mobile phone network RPG game. From planning to implementation, it is finally transplanted to 3 common models for adaptation, and an OTA platform is built to release the game.
Android platform development engineers
master the construction of Android development environment;
Android SDK;
Android API core development kit;
Android architecture;
basic components of p>Android;
commonly used widget components;
master the development of GPS application on Android platform.
IPhone platform development engineer
knows the Mac platform and is familiar with the use of XCode;
be familiar with the basic syntax of Objective-C, and be able to complete basic code writing;
familiar with the development framework and message model in iPhone SDK;
deeply understand the process and process of iPhone development;
Skillfully writing iPhone applications
Wap Mobile Internet Engineer
Overview of wireless websites, introduction of development technology and process of wireless websites, WML markup language, and WML creating static WAP sites.
JSP basic syntax, built-in objects, common actions, Servlet development technology, MVC design pattern.
To realize the function of online community based on Web, users can register, log in to the community, make friends, chat, check news and participate in interactive games.
Oracle database deployment, PL/SQL syntax, common PL/SQL commands, stored procedures, cursors and triggers.
Struts MVC framework development, IOC and AOP programming in Spring, and Java ORM programming in Hibernate. SSH integrated development.
realize a large-scale community integrating Web and WAP, so that users of mobile phones and internet can exchange information and publish information on this platform.
[ Edit this paragraph ]3G standards
3G standards: they are WCDMA (European version), CDMA2 (American version) and TD-SCDMA (China version) respectively.
in may 2, the international telecommunication union (ITU) determined four mainstream wireless interface standards, namely WCDMA, CDMA2, TD-SCDMA and WiMAX, and wrote them into the 3G technical guidance document "international mobile communication plan 2" (IMT—2 for short). CDMA is the abbreviation of Code Division Multiple Access, which is the technical basis of the third generation mobile communication system. The first generation of mobile communication system adopts frequency division multiple access (FDMA) analog modulation mode. The main disadvantages of this system are low spectrum utilization and signaling interference with voice services. The second generation mobile communication system mainly adopts time division multiple access (TDMA) digital modulation mode, which improves the system capacity, and uses independent channels to transmit signaling, which greatly improves the system performance, but the system capacity of TDMA is still limited and the handover performance is still not perfect. CDMA system shows great development potential because of its simple frequency planning, large system capacity, high frequency reuse coefficient, strong anti-multipath ability, good communication quality, soft capacity and soft handover. Here are some 3G standards:
(1) W-CDMA
, also known as WCDMA, also known as Wideband CDMA, also known as CDMA Direct Spread, which means wideband code division multiple access. This is a 3G technical specification developed based on GSM network and a broadband CDMA technology proposed by Europe. It is basically the same as the broadband CDMA technology proposed by Japan and is being further integrated. The supporters of W-CDMA are mainly European manufacturers with GSM system, and Japanese companies are more or less involved, including Ericsson, Alcatel, Nokia, Lucent and Nortel in Europe and America, as well as NTT, Fujitsu and Sharp in Japan. This standard puts forward the evolution strategy of GSM(2G)-GPRS-EDGE-WCDMA(3G). This system can be set up on the existing GSM network, and it can be easily transitioned for system providers. It is expected that the acceptance of this new technology will be quite high in Asia where GSM system is quite popular. Therefore, W-CDMA has inherent market advantages.
(2)CDMA2
CDMA2 is a wideband CDMA technology developed from narrowband CDMA(CDMA IS95) technology, also known as CDMA Multi-Carrier. It was proposed by Qualcomm North America Company of the United States, with Motorola, Lucent and Samsung of South Korea participating, and South Korea is now the leader of this standard. This system is derived from the narrow-band CDMAOne digital standard, and can be directly upgraded from the original CDMAOne structure to 3G, with low construction cost. But at present, CDMA is only used in Japan, South Korea and North America, so there are not as many supporters of CDMA2 as W-CDMA. However, the research and development technology of CDMA2 is the fastest among the current standards, and many 3G mobile phones have taken the lead. This standard puts forward the evolution strategy from CDMA IS95 (2G)-CDMA 21x-CDMA 23x (3G). CDMA21x is called the 2.5 generation mobile communication technology. The main difference between CDMA23x and CDMA21x lies in the application of multi-carrier technology, which improves the bandwidth by adopting three carriers. At present, China Telecom is adopting this scheme to transition to 3G, and has built a CDMA IS95 network.
(3)TD-SCDMA
is called Time Division-Synchronous CDMA (Time Division Synchronous CDMA), which is a 3G standard independently formulated by Chinese mainland. On June 29th, 1999, China Institute of Telecommunications Science and Technology (Datang Telecom) proposed it to ITU, but the technical invention originated from Siemens, and TD-SCDMA is known as green 3G because of its low radiation. This standard integrates the international leading technologies such as smart wireless, synchronous CDMA and software radio, and has unique advantages in spectrum utilization, flexibility in service support, frequency flexibility and cost. In addition, due to the huge market in China, the standard has attracted the attention of major telecom equipment manufacturers, and more than half of the equipment manufacturers in the world have announced that they can support the TD-SCDMA standard. This standard proposes a direct transition to 3G without the intermediate link of 2.5 generation, which is very suitable for upgrading GSM system to 3G. Military communication network is also the core task of TD-SCDMA.
[ edit this paragraph ]3G parameters
WCDMA
RTT FDD
asynchronous CDMA system: no GPS
bandwidth: 5MHz
chip rate: 3.84Mcps
China frequency band: 194MHz-1955MHz (uplink) and 213MHz -2145MHz.
TD-SCDMA
RTT TDD
synchronous CDMA system: GPS
bandwidth: 1.6MHz
chip rate: 1.28Mcps
China frequency band: 188-192MHz, 21-225 MHz
23-24 MHz
CDMA 2
RTT FDD
synchronous CDMA system: with GPS
bandwidth: 1.25MHz
chip rate: 1.2288Mcps
China frequency band: 192mhz-1999.
WiMax
Worldwide microwave interconnection access, another name is 82.16
Bandwidth: 1.5M to 2MHz
Maximum access speed: 7M
Maximum transmission distance: 5km
Chip rate: unknown
China band: (not available)
[ Edit this paragraph].
●3G is a soap opera that you can't miss by train;
●3G is an image sent back from the scene to the headquarters for analysis;
●3G is to enjoy your wonderful holiday in Morocco with friends.
The 3G road in China has just begun. The first popular 3G application is "wireless broadband Internet access", and 6 million mobile phone users can access the Internet anytime and anywhere. The streaming media service of wireless Internet will gradually become dominant. The core applications of 3G include:
1. Broadband Internet access
Broadband Internet access is a very important function of 3G mobile phones. At that time, we can send and receive voice mails, write blogs, chat, search, download ringtones, etc ... Now many people think that these functions and applications on mobile phones will wait until the 3G era, but in fact, the current wireless Internet portal can already be provided. Although the current GPRS network speed is not very satisfactory, it is no longer a dream that mobile phones will become small computers when the 3G era comes.
2. Video call
In the p>3G era, the traditional voice call is already a very weak function. By then, new services such as video call and voice mail will be the mainstream, and the traditional voice call charges will be reduced, while the visual impact will be strong, and the fast and direct video call will become more popular and develop rapidly.
The most talked about in 3G era is the video calling function of mobile phone, which is also one of the most popular 3G services abroad. I believe many people have used the video chat function of QQ, MSN or Skype to chat "face to face" with distant relatives and friends. In the future, relying on the high-speed data transmission of 3G network, 3G mobile phone users can also "face-to-face". When you make a video call with a 3G mobile phone, instead of putting the phone to your ear, face the phone and put on a wired headset or a Bluetooth headset. You will see the other person's image on the phone screen, and you will be recorded and sent to the other party.
3. Mobile TV
From the perspective of operators, the issuance of 3G licenses has solved a great technical obstacle, and the construction of standards such as TD and CMMB has also promoted the development of the whole industry. Mobile streaming media software will become the most used mobile TV software in the 3G era, which will improve the smoothness of video images and picture quality, break through the technical bottleneck and be really applied on a large scale.
4. Wireless search
For users, this is a practical mobile network service, which can also be quickly accepted. Searching by mobile phone anytime and anywhere will become a common life habit for more mobile phone users.
5. Mobile music
In Japan, where the wireless Internet is mature, mobile music is the most beautiful landscape, and downloading music from the Internet through mobile phones is 5 times that of computers. In the 3G era, as long as a mobile phone music software is installed on the mobile phone, the mobile phone can be turned into a music box anytime and anywhere through the mobile phone network, and countless songs can be easily stored, with faster download speed and negligible traffic consumption.
6. Mobile shopping
Many people have the experience of shopping on Taobao, but the mobile mall is still a new thing for many people. In fact, mobile e-commerce is the favorite of mobile Internet users in the 3G era. At present, 9% of Japanese and Korean mobile phone users are used to spending on their mobile phones, even buying daily necessities such as rice and washing powder. Experts predict that there will be a rapid growth period of mobile shopping in China in the future. As long as users open the mobile Internet service, they can query product information through their mobile phones and pay for products online. High-speed 3G can make mobile shopping more real, and high-quality pictures and video conversations can bring the distance between merchants and consumers closer, improve the shopping experience and make mobile shopping a new trend.
7. Mobile online games
Compared with computer online games, the experience of mobile online games is not good, but it is easy to carry and can be played at any time, which makes use of bits and pieces.