The long-awaited 4G licenses were finally issued, and at the same time issued to China Mobile, China Telecom, and China Unicom. This time only TDD licenses were issued to three operators, without mentioning the timing of the issuance of FDD licenses. The relevant person in charge of the Ministry of Industry and Information Technology mentioned in the interpretation that relevant companies will be approved to carry out LTEFDD network technology trials, and the system will verify the hybrid group of LTEFDD and TD-LTE. The development model of the Internet, and LTE FDD licenses will be issued when conditions are mature.

At a glance, every street and alley, everyone is holding a 3G mobile phone. 3G mobile phone usually refers to the 3G network signal source of China Mobile or China Unicom, and the cellular mobile communication technology that supports high-speed data transmission, 3G The network service can transmit voice and data information such as e-mail and instant messaging at the same time. It is the hub of high-end mobile communication.

At the forefront of technological development, the 3G communications industry has driven many industries, such as mobile phones, GPS navigation, wireless Internet tablet computers, notebook computers and other industries. Among them, the mobile phone industry is the most obvious, from the birth of the first generation of mobile Internet to the present The 3G visual and voice is a leap-forward development, which has led to the sustainable development of many industries.

In addition, Lanjing Electronics mentioned that when 3G mobile networks were popular, SMD crystal oscillators occupied a dominant position. Crystal oscillators are particularly important in high-precision electronic products such as mobile phones, computers, and digital products. For example: MC-146 crystal, the electronic component commonly used in mobile phones, which is currently the most used component in electronic digital products, and some active crystal oscillators, high-precision active crystal oscillators, such as wireless communication base stations and high-performance computers. It is more accurate than ordinary crystal oscillators and runs fastest in wireless networks.

When 3G mobile phones are popular all over the world, the fourth-generation 4G mobile communication network is also quietly sprouted. Officials believe that the issuance of 4G licenses will greatly promote the demand for 4G terminals represented by smart phones in 2014, especially the demand for smart phones to be updated, so that the wave of domestic smart phone replacements may come early next year.

4G communication technology actually strengthens the network reform on the original 3G network. The popular point is that the 4GLTE system can download data at a speed of 100Mbps, and the upload speed can also reach 50Mbps, and can satisfy almost all users' wireless services. Require. The 4G LTE Advanced adopts carrier aggregation technology, and the downlink peak speed can reach 150Mbps. In addition, 4G can be deployed in areas not covered by DSL and cable modems, and then expanded to the entire region. Obviously, the explosion of 4G communication networks is far from comparable to 3G networks.

Once the 4G network has exploded, the communications market and crystal oscillator industry will inevitably lead to a major challenge. At the same time, it will also usher in a major explosion.

It goes without saying that the requirements of 4G communication networks will be very high, and ordinary quartz crystals will not meet the requirements. This is also a problem for crystal manufacturers, which must rely on high-precision, high-stability active crystals to promote With its development, a high-precision electronic component can accurately provide the signal base source and provide an accurate clock signal, which has ensured the smoothness of the network and made the advantages of the 4G network more obvious.

Since base stations that provide clock signals need to receive and send signals outdoors, they have very high requirements on the ambient temperature. This requires a temperature-compensated crystal oscillator to adjust the frequency difference. 4G networks are faster, receive more data from signal sources, and control voltage. Part of it is also very relevant. The voltage-controlled temperature-compensated oscillator can solve this problem and better enable the 4G communication base station to operate without pressure.

Lanjing Electronics is ready to welcome the arrival of 4G.