GSM/CDMA Dual-mode mobile phone details-go

Due to the surge in the number of mobile phone users, the mobile phone communication network system is overloaded, the final result will lead to failures such as disconnection, crosstalk, poor voice quality, and difficulty in accessing the Internet. To solve the above fault, more and more mobile phone operators and manufacturers are realizing this and are constantly taking relevant measures to further expand the mobile phone network system and improve the voice quality during mobile phone communication, as a result, many mobile phone manufacturers have launched mobile phones that support both GSM and CDMA networks on the basis of mature GSM networks. Although this dual-mode mobile phone has just been launched, due to its appearance, turn Mobile Phones Based on GSM and CDMA from dream to reality. Use GSM/C

DMA dual-mode mobile phones allow users to switch between GSM and CDMA freely, which can effectively avoid problems such as past calls, difficult calls, and poor sound quality. This is more convenient than the previous calls that only use the GSM network.

As the name suggests, the so-called "dual-mode" means to work in two network modes, which are GSM and CDMA, the so-called "GSM/CDMA Dual-mode mobile phone" means that the mobile phone can support both GSM and CDMA network communication technologies at the same time. It can be selected based on the environment or actual operation needs, which network technology can play a more important role, let the mobile phone switch to which mode to work. If in one mode, the quality of the mobile phone communication is not high or there are other bad communication phenomena, you can freely switch to another network mode. It actually expands the call frequency of the mobile phone and greatly improves the communication stability. In some regions where mobile phone users are concentrated, dual-mode mobile phones are especially suitable, because dual-mode mobile phones can be flexibly switched between the GSM network and the CDMA network, so that the communication can always be maintained, in addition, it can receive signals at the same time, and then combine the received signals to filter out the noise signals and highlight the voice signals to enjoy high-quality speech. In addition, dual-mode mobile phones use broadband technology to support call transfer, call wait, third-party talks, caller number display, short messages, voice mail, and automatic roaming.

Because GSM/CDMA Dual-mode mobile phones can work in two different technical networks at the same time, dual-mode mobile phones undoubtedly have the characteristics of these two network technologies. From a technical point of view, due to the high frequency band, the GSM network has a strong signal penetration capability, so it can bring good communication quality and communication coverage in the complex environment with high-rise buildings; while the CDMA network, the system capacity is very large. For resources of the same frequency, the system capacity of the CDMA network can be 8-10 times that of the analog network and 3-4 times that of the GSM network. To cover the entire city of Beijing, the GSM network requires more than 300 base stations, while CDMA only requires about 80 base stations to achieve this goal, saving limited frequency resources. The unique broadband transmission method of CDMA provides strong anti-interference capabilities and is suitable for developing high-speed data transmission services on mobile phones. In addition, the GSM network has strong confidentiality and anti-interference capabilities, clear sound quality, stable calls, large capacity, high frequency resource utilization, open interfaces, and powerful functions; the CDMA network also has the ability to automatically track the multi-path signal and soft switching technology, greatly reducing the possibility of switch-off, which will be very beneficial to users in the mobile process and data transmission. The appearance of dual-mode mobile phones will undoubtedly have the deepest feelings for users and will be the most practical at the same time, because dual-mode mobile phones are used for roaming through the GSM/CDMA network, the drop-down phenomenon will be greatly reduced, and the incoming and outgoing calls will be more free. At the same time, all the advantages of the two network technologies can be obtained, therefore, dual-mode mobile phones can ensure that mobile phone users can freely communicate with each other in 160 countries on five continents.

The biggest opinion of mobile phone users on the internet is frequent discalls. Not only do people suffer from this problem during their calls, but also worry that if the Internet supports fax in the future, will the wireless fax become "Water month" due to phone disconnection ". This is because the mobile phone uses "Hard switch" during the over-the-zone switch. When a base station enters another base station coverage area, the connection with the original base station is broken first, then contact the base station in the new coverage area. This is what we usually call "disconnected first and then connected". Of course, the time difference between the disconnection is only several hundred milliseconds, under normal circumstances, people cannot feel it, but once the mobile phone cannot contact the new base station because it enters the blocked area or the channel is busy, it will be generated; the dual-mode mobile phone is now using the "soft switch" technology. During the over-the-zone switch, the dual-mode mobile phone does not disconnect the connection with the original base station while contacting the new base station, when the mobile phone confirms that the new base station has been connected, the connection with the original base station will be disconnected, that is, "first pick up and then disconnected". The disconnection may be almost absent.

Currently, in the China Mobile Market, several mobile phone manufacturers are preparing to develop dual-mode mobile phones that can be used in both GSM and CDMA networks for the CDMA network to be launched soon in China, we plan to see a prototype of dual-mode mobile phones at the end of this year. The upcoming dual-mode mobile phone is expected to have many advantages, including fast Internet access, high communication quality, high network connection stability, flexible switching methods, and reasonable pricing. When using this mobile phone to answer the phone, the mobile phone is automatically in the voice channel status. Once the communication ends, the mobile phone will return to the data channel status again. If you are a user who often needs to travel around the world, the dual-mode mobile phone will make you more unobstructed!

Of course, although dual-mode mobile phones are powerful, we should still believe that GSM phones will remain quite dynamic. First, it is the advantage of network coverage. GSM mobile phones have significant advantages in international roaming and domestic roaming for a long time. Second, it is the advantage of maintenance level, the presence of a large number of experienced system-trained manufacturers and field technicians effectively reduces network operation costs and system risks. The third advantage is that GSM mobile phones are widely known, however, ordinary users do not understand the advantages of dual-mode mobile phones. This increases the ad cost and increases the difficulty of marketing. In addition, there is still much room for improvement in GSM mobile phone technology, such as replacing FR (full rate voice encoding) with EFR (enhanced full rate voice encoding) to improve the quality of speech, making data fax and other services put into application as soon as possible should be said that GSM mobile phones are still very attractive.