Introduction of CDMA GSM dual-mode mobile phone

It is reported that China Unicom to "World Wind" named dual-mode mobile phone and dual-mode business will be formally presented in the end of July in front of Chinese users. The meaning of the dual-mode mobile phone is to provide a seamless mobile communication experience for the end users, so that those who are often in the mobile business people truly realize the "one machine around the world" dream. At the same time, dual-mode mobile phone will also be very good integration of the advantages of GSM network voice calls and CDMA network to support high-speed data services, and effectively achieve the advantages of two nets, thereby helping to give full play to the advantages of CDMA network and GSM network. This is not only good for the end users to meet the needs of differentiated services, and users will have a new application experience, to enjoy a higher quality of communication services.

Dual-mode mobile phone and dual-mode card, is to achieve the "world Wind" business essential hardware load, but also the end user to establish a direct source of awareness of the business. On the one hand, dual-mode mobile phone to achieve the complementary advantages of the network, through dual-mode mobile phones and dual-mode cards, users can easily according to their call quality or business application needs anytime and anywhere in the CDMA network and GSM network to switch between; The user's full endorsement and welcome to the business is also largely dependent on the experience of using a dual-mode handset. Therefore, the dual-mode mobile phone before moving to the market, the selection of suitable terminal products and the first to cultivate users of dual-mode mobile phones and even dual-mode business awareness is particularly important.

Network complement each other

The number of mobile phone users in China has grown rapidly. With the proliferation of mobile phone users, mobile communication systems will inevitably work in excess of time, which will lead to mobile phone in the communication is likely to be similar to drop, crosstalk, poor voice quality, slow internet speed, loss of packets and other failures. To solve the above problems, it is widely adopted by operators to optimize the network or to enlarge the network of mobile communication system. On the basis of existing networks, the introduction of dual-mode mobile phones supporting both GSM and CDMA networks can enable users to switch freely between GSM and CDMA, thus effectively avoiding the problems of speech, difficulty in communication and poor sound quality. Compared with the use of a single GSM network or CDMA network to call, the combination of two network advantages of dual-mode mobile phone is self-evident. (Computer science)

GSM/CDMA Dual-mode mobile phone can support both GSM and CDMA communication technologies. In the actual use of the process, users can be based on the environment or the needs of the actual operation from which to choose: Which network technology can play a role, let the phone switch to which mode to work. If in one mode, the quality of mobile communication is not high or other bad communication phenomenon, users can freely transfer to another network mode of work, the dual-mode mobile phone is actually expanding the phone's call frequency, and greatly improve the stability of communications. Moreover, because the CDMA network has better data service support ability than GSM network, the dual-mode handset can also enable GSM users to enjoy rich data services such as multimedia SMS, online games, web browsing and so on.

Because the GSM/CDMA dual-mode mobile phone can work at the same time in the application of two different technologies in the network, so the dual-mode mobile phone undoubtedly integrates the advantages of two network technologies. From the technical point of view, the high frequency band of GSM network brings strong signal penetrating ability, so it can bring good call quality and communication coverage in the complex environment of high-rise buildings. and CDMA network, system capacity is very large, the same frequency resources, CDMA network system capacity can be analog network 8~10 times, GSM network 3~4 times, so can save a limited frequency resources. In addition, the CDMA network has a strong anti-interference ability, and is very suitable for the transmission of high-speed data services. As a result, the dual-mode handset will bring tangible benefits to the end user. With the roaming between GSM and CDMA network, the drop-off phenomenon will be greatly reduced, and users can also enjoy all the advantages of two kinds of network technology. Therefore, the dual-mode mobile phone is very fit with the concept of "World Wind", that is, to ensure that mobile phone users can freely in more than 160 countries across the five continents to communicate and enjoy a wealth of data services.

Strong support for terminals

Dual-mode mobile phone is the biggest feature of the combination of GSM and CDMA network advantages. However, the technical level of the advantages of the show, ultimately still rely on users for the use of dual-mode terminals experience. Simple network Switching operations, clear menu rendering, for different users of the market after the breakdown of the functional configuration and other factors, the common achievements of the dual-mode mobile phone market recognition degree. China Unicom for the "World Wind" dual-mode mobile phone customization in accordance with strict tendering procedures to complete. It is reported that China Unicom's dual-mode mobile phone will launch the first batch of Motorola A860, Samsung SCH-W109 and LGW800 three high-quality mobile phone products. With high-end business people as the target, these three phones, whether it is the appearance of design, hardware indicators and accessories configuration, or function, and so on represent the highest level of the current domestic mobile phone terminal, in the business function can support GSM voice, SMS business and based on CDMA "Unicom Unlimited" all value-added services.

According to the specific environmental characteristics, easy to switch between GSM network and CDMA network, thus providing seamless voice communication, is one of the most prominent features of dual-mode mobile phone. The technical superiority in the terminal product embodiment, then is the special dual-card slot design. These three "World wind" dual-mode mobile phones are designed with dual-card slots, each of which supports both the dual-mode card and the SIM card under the GSM network or the UIM card under the CDMA network. Accordingly, the mobile phone keyboard also deliberately set the GSM and CDMA switching hot keys, whether in the boot state or standby state, users have the choice of different operators, different networks of complete autonomy, and according to the actual network situation and their own application needs at random in different networks to switch between.

Dual-mode mobile phone through the dual-card slot and other design to achieve the GSM network and CDMA network between the free switch. But for the increasingly intelligent, integrated mobile phones, voice communication function is only the most basic requirements for the rich and colorful data services to support the current mobile phone has the greatest appeal. To a large extent, the introduction of dual-mode mobile phones is to make up for the GSM network in the transmission of data services through CDMA network deficiencies. Because of this, whether Motorola's A860, Samsung's sch-w109, or LG's W800, all use the current mobile phone market, such as 260,000 color, high pixel built-in camera, such as the most top-level configuration, support cdma1x all data services.

Motorola's A860, for example, uses a folded dual-screen design to support all of the cdma1x's data services. Up to 1.2 million pixels of the built-in camera, it is compared to the other two mobile phones the biggest bright spot. At the same time, A860 's main screen adopts a 260,000-color TFT screen and high resolution of 176x220 pixels, making it the most current configuration in terms of sharpness and color. Samsung's sch-w109 can support 1 hours of continuous filming. LGW800 can support 72-chord ringtones and use Unijava technology to make downloading more convenient and more versatile. In addition, the LGW800 to the back of the dual-card slot set priority. If the user chooses to set up the network automatically at power-on, the SIM card with higher priority will be activated automatically so that the phone can automatically select the network that the card belongs to.

Samsung SCH-W109 Dual-mode mobile phones and A790 in the United States into commercial use of the same Qualcomm MSM6300 chipset solutions, the GSM and CDMA network to achieve a global roaming, and stable performance. As the first dual-mode mobile phone, Samsung A790 has withstood the test of the user, proved its technology is mature, and is in line with user needs. Similarly, the launch of the W109 in China not only inherits A790 's mature technology, but also uses a dual SIM card design for the needs of the Chinese market. The specific operation of the dual-mode mobile phone is as follows: If the user only inserts a card, W109 will default the card's network; If two cards are inserted, W109 prompts to select a network when it is powered on. When a user selects a network, the phone is initialized, primarily the phonebook. If users want to change the network in the course of use, you can switch the network by pressing the "c/g" switch key on the left side of the direction key.

W109 Dual-mode mobile phones and single-mode mobile phones, in addition to the design of dual-card slot, there are many other differences. First of all, in the screen display, dual-mode mobile phone is the biggest feature of the battery signal on the side of a C or g of the hint symbol, C represents the CDMA network, and G means GSM network. Second, phone books and non-dual-mode phones are also different. When using a network, the phone book contains only the phone number of the corresponding card and the number in the telephone, and the number on the other is not displayed. In addition, when answering the phone, if you are in the other side of the network to call, nature can be connected, but if the other person dialed the number is not the current use of the network number, the dual-mode mobile phone will not give any hint, accordingly, the other side will hear "you dialed the phone has been turned off" the beep.