wcdma carriers

GSM is a 2G network and can be used by China Mobile Unicom.CDMA is a 2G network of China Telecom. 3G:WCDMA is China Unicom's 3G network,China Telecom 3G is CDMA 2000,China Mobile 3G is 3g/TD-SCDMA. Both of them are networks that are also supported

With the rapid development of communication service and the surge of traffic, the future mobile communication system should not only have large system capacity, but also can support the effective transmission of voice, data, image, multimedia and other services. The third generation mobile communication system combines high speed mobile access and internet-based protocol services to provide users with more economical and richer wireless communication services while increasing the wireless freque

-mode mobile phone, WCDMA Mobile Phone compatible with GSM standard, TD-SCDMA mobile phone compatible with GSM standard, CDMA 2000 mobile phone compatible with CDMA standard. There are also cross-standard dual modes, such as GSM/CDMA Dual-mode. 2. if a mobile phone supports both the GSM and CDMA standard, it may not be able to use three cards. For example, although HTC s710d supports the GSM/CDMA standard, it can only use a telecom card, not only beca

China's 3G network will be operated by a number of operators, in order to allow users to enjoy these services across the operator, the need to achieve different 3G system packet domain interconnection. Interconnection and interoperability of WCDMA grouping domain and external packet network Interconnection of WCDMA and Internet WCDMA is connected to the Intern

carrier interval and a constant. 1T,2T,3T,..., KT guarantees the orthogonality of the sine wave sequence.　　1.2 Next, the cos (t) is also introduced. It is easy to prove thatcos (t) is orthogonal to sin (t) and is orthogonal to the entire sin (kt) orthogonal family. Similarly, thecos (KT) is also orthogonal to the entire sin (kt) orthogonal family. So the launch sequence expands to {sin (2π δf t), sin (2π δf 2t), sin (2π δf 3t),..., sin (2π δf kt),cos (2π δf t), cos (2π δf 2t), cos (2π δf 3t),..

to the entire sin (kt) orthogonal family. Similarly, the Cos (KT) is also orthogonal to the entire sin (kt) orthogonal family. So the launch sequence expands to {sin (2π δf t), sin (2π δf 2t), sin (2π δf 3t),..., sin (2π δf kt), cos (2π δf t), cos (2π δf 2t), cos (2π δf 3t), ..., cos (2π δf kt)} is also a logical.1.3 After the first two steps of expansion, selected 2 sets of orthogonal sequence sin (kt) and cos (KT), this is only the transmission of "media." The actual information to be transmi

impatient is just a manifestation of the weak.China Telecom is far more radical than China Telecom. At present, China Telecom's current situation can be described as the former tiger and the latter Wolf, in the middle, suffering from enemies.In fact, China Telecom's radical strategy is to fight for the survival of the future. It is a last resort and a helpless choice that knows that there will be future troubles.Although on the surface, China Telecom's Tianyi development is fast, in fact, it is

bind 3G to the European 3G.Reporter: Nokia mentioned 3G seems to only talk about WCDMA, does it mean to give up Chinese national 3G standard TD-SCDMA market?He: No. We believe that TD-SCDMA market positioning should be bundled with WCDMA will be better, so that there will be space for development around the world. If the TD-SCDMA rushed out separately, I believe the development space is limited.Reporter: I

1. Introduction As China becomes more open to the communication field, competition among telecom operators is becoming increasingly fierce. How to reduce network construction investment and reduce O M costs becomes more and more important. Network convergence enables operators to provide various fixed and mobile access services on the same network. By sharing devices in the network, carriers can achieve unified services, management, and billing, ulti

China Mobile received a pass from China tietong to enter the fixed network. China Unicom's GSM network and China Netcom merged into the new China Unicom, and China Telecom received China Unicom's CDMA business, the three carriers have mobile and fixed network services respectively. China Mobile is better at mobile communication, while China Telecom is better at fixed network. Many people hope to break China Mobile's dominant position through restruct

development, but has little practical experience.Is a selling point. There is a video phone on that phone. The iPhone video phone is not a 3G video phone, but an IP video phone.Why is the development of video calls in China slow? For some reason, major operators have not promoted the 3G video service. Currently, video communication is only provided for demonstration, proving that they have this advanced capability and are not commercially available. The circuit domain method provided by

FDD BAND1/3/7,TD-SCDMA band34/39,wcdma band1/2/5/8,gsm. China's operators are divided into different frequencies, and many carriers in many countries in the world also divide different bands. The more the mobile phone support frequency, the more network support, the better the roaming of mobile phones. For example, China's 4G mobile phone, which runs at 1900MHz in China, may need to run on 2200MHz freque

+ CDMA are currently the main methods. First, the wireless LAN can be combined with the WCDMA Mobile Network in two ways: the Compact mode and the loose mode. In the Compact mode, the WLAN network is connected to the GPRS Core network in the same way as the WCDMA base station (Iups interface. This method fully utilizes the existing mobile, security, and service quality mechanisms of the GPRS Core network t

: MBMS transfers data to UE. 2. Broadcast Business Process Unlike multicast services, in broadcast mode, you do not need to join multicast groups. When receiving and exiting the broadcast business, you need to activate and deactivate the business locally without interaction between the network and UE. 3. Implementation of multicast services Business and Application Based on MBMS Technology MBMS provides a set of broadcast/Multicast Transmission Channels fully operated and controlled by

1. Introduction As we all know, 3G network technology has three major technical systems, namely WCDMA, CDMA2000 and TD-CDMA technology. The first two technical systems because of the early, but also in Europe and the United States a number of well-known telecommunications equipment manufacturers, research institutions and operators support, so no matter from the standard or technical maturity, are relatively far ahead. TD-SCDMA is the 3G standard of

manager Liu Bo said CDMA evdo speed ratio than fixed net 512K or 1M faster. Under 2mbit/s conditions, the use of high-definition camera notebook, wireless transmission, the user in any location shooting content can be transmitted through the 3G mobile transmission channel accurately. China Unicom WCDMA Download 100MB video A few minutes to complete According to the media use of 3G mobile phone test data, has not yet begun to test commercial China

on providing good outdoor coverage rather than indoor coverage. Therefore, the number of users of the third-generation communication business in early broadband code division multiple access (WCDMA) is much lower than that of the second-generation communication business. In addition to ensuring higher service quality (QoS), the dedicated indoor coverage system also allows operators to win more roaming users, because most roaming users enable the auto

operators. Carriers are more concerned with customization, industry orientation, and the quality of their network capabilities, that is, their brand businesses and services, and their network access as the bearer. If I am a carrier, I will look at the following Star (including alternate) System Platform: IPhone (IOS): As long as you cooperate, you can win users by using the iPhone brand. In China, the iPhone can be China Unicom's

Mobile Internet Development Analysis of telecom operators Mobile Internet is a general trend in the development of the communications industry. With the rapid development of high-speed wireless access technologies such as 3G and WiMAX, mobile Internet not only inherits many fixed Internet technologies, it also expands user needs in business, entertainment, and mobility. Since the issuance of 3G licenses in China in January 2009, China's three major carriers