1, which has all the functions of an ordinary mobile phone, and can be used for normal mobile phone applications such as calling and texting.
2. Have wireless Internet access capability, that is, support GPRS under GSM network or CDMA 1X or 3G network under CDMA network.
3. It has the functions of PDA, including PIM (Personal Information Management), schedule, task arrangement, multimedia application and web browsing.
4. Have an open operating system. On this operating system platform, more applications can be installed, so that the functions of smart phones can be expanded infinitely.
Since only mobile phones with operating systems can be called smart phones, what are the types of operating systems? Since the birth of smart phone is related to PDA, its operating system will certainly be related to PDA. Symbian and Windows CE, Palm and Linux are still the four camps. However, unlike Palm and Windows CE competing for hegemony on PDA operating system, Symbian has taken the lead in smartphone operating system, and Sony Ericsson, Nokia, Motorola and Panasonic basically adopted Symbian-based operating system.
Symbian:Symbian is very similar to the combination of Windows and Linux. It has a good interface, adopts the technology of separating the kernel from the interface, has low hardware requirements, and supports C++, VB and J2ME. Poor compatibility. Representative model: Nokia 6600 Sony Ericsson P908 Siemens SX 1
WINDOWS CE: Due to the powerful strength of Microsoft, Windows CE has many inherent advantages, such as powerful built-in software, such as Word, Excel, IE, MSN Messenger, Outlook, Media Play and so on. It is difficult for similar software on other systems to be so perfectly unified. Due to the extremely high hardware requirements and high price, the power consumption is still very large and the system stability is poor. Representative model: dopod smart phone series.
Palm: This system doesn't require much hardware, so it can be well controlled in price and consumes little power. PALM appeared earlier, but there are still many imperfections in its application in mobile phones. Like the other two systems, PALM is weak. Representative model: Samsung SGH-i500Treo 600.
Linux:Linux has many advantages, such as open source code, low cost of software licensing, rich human resources for application development, and convenient development of personal and industrial applications. Starting too late, there is no solid foundation. Representative models: Motorola A760, Samsung i5 19.
Besides these four operating systems, have you heard of other operating systems such as S60 and S70? What are these? Actually, these are all branches of Symbian. Why do you say that? It turns out that Symbian OS is just the kernel of an operating system, and the interface can be developed by various manufacturers themselves. The interfaces of 92 10 and 3650 are different, and P908 and 6600 are different. 6600 uses 60 series interface, and P908 uses UIQ interface, which also leads to the program can not be universal because of subtle differences. Even Symbian OS 6.0 of 92 10 and 6. 1 of 3650 are mostly incompatible because of interface problems. I think we need to wait a few days to solve this problem. In different interfaces, there are different advantages and disadvantages. 60 series is easy to operate, and it is easy to switch off tasks, while UIQ interface can support handwriting operation and has more functions, but it is more troublesome to switch off tasks.
3G (abbreviation of the third generation) is the third generation mobile communication technology. Compared with the first generation analog mobile phones (1G) and the second generation GSM, TDMA and other digital mobile phones (2G).
3G mobile phone, that is, the third generation mobile phone, generally refers to a new generation mobile communication system that combines wireless communication with multimedia communication such as the Internet. It can handle images, music, video streams and other media forms, and provide a variety of information services including web browsing, teleconference, e-commerce and so on. In order to provide this service, the wireless network must be able to support different data transmission speeds, that is, in indoor, outdoor and driving environments, it can support at least 2Mbps (megabits per second), 384kbps (kilobytes per second) and 144kbps respectively.
3G technical standard
In May 2000, the International Telecommunication Union (ITU) determined three mainstream wireless interface standards: W-CDMA, CDMA2000 and TDS—CDMA, and wrote them into the 3G technical guidance document "International Mobile Communication Plan 2000" (IMT—2000 for short).
W—CDMA
That is wideband code division multiple access, also known as CDMADirectSpread, which means wideband code division multiple access. Its supporters are mainly European manufacturers with GSM system, and Japanese companies also participate in it to some extent, including Ericsson, Alcatel, Nokia, Lucent and Nortel in Europe and America, as well as NTT, Fujitsu and Sharp in Japan. This system can be built on the existing GSM network, which can be easily transitioned by system providers. In Asia, where GSM system is quite popular, the acceptance of this new technology is expected to be quite high. Therefore, W-CDMA has inherent market advantages.
CDMA2000
CDMA2000, also known as CDMAMulti—Carrier, was proposed by Qualcomm North America Company of the United States, and Motorola, Lucent and Samsung of South Korea all participated in it. At present, South Korea is the leader of this standard. The system originated 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 CDMA2000 as W-CDMA. However, the research and development technology of CDMA2000 is the fastest among the current standards, and many 3G mobile phones have already taken the lead.
TD—SCDMA
This standard is a 3G standard independently formulated by Chinese mainland. On June 29th, 1999, China Institute of Telecommunications Science and Technology (Datang Telecom) proposed to ITU. The standard integrates international leading technologies such as smart wireless, synchronous CDMA and software radio, and has unique advantages in spectrum utilization, business support flexibility, 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.
When will 3G come?
Japanese mobile communication giant NTTDoCoMo has launched the world's first 3G service on June 10, which is based on WCDMA standard.
At present, Asia has become the fastest growing region of 3G, followed by Europe, and the United States is far behind in technical preparation due to lack of enthusiasm. In addition to Japan and South Korea, Thailand and Hong Kong also issued 3G licenses. Taiwan Province Province will soon issue 3G licenses, and the mainland is expected to issue 3G licenses before the end of the year. It is expected that the market will issue two or three cards.