Is LTE-Advanced the evolution of LTE? LTE is the evolution of 3G mobile communication system and the most mainstream B3G mobile communication standard in the world. LTE Advanced is the continuous evolution of LTE system. The official name of LTE-Advanced is the further development of E-UTRA, which was originally a part of the 10th edition specification of 3GPP (version 10), and it is fully compatible with LTE. ? As the evolution of 3G UMTS system, 3GPP started the standardization of the next generation mobile communication system at the end of 2004, and named it LTE, which means long-term evolution. LTE system supports TDD/FDD duplex mode, adopts SC-FDMA/OFDM new uplink and downlink multiple access technology, supports the maximum bandwidth of 20MHz, adopts flat system architecture, simplifies network elements, supports advanced technologies such as MIMO and smart antenna, and can provide high-speed, low-delay, low-bit-cost, multi-type and quality-grade services.

At the end of 2008, the LTE standard completed the formulation of the first version of 3GPP Release 8. On the other hand, ITU held the World Radio Congress WRC07 in 2007, which started the allocation of B3G spectrum. In 2008, the minimum performance requirements and evaluation methods of IMT-2000 (3G) system evolution-IMT-Advanced (hereinafter referred to as "4G") system were formulated, and the IMT-A technical standard set was released. In order to maintain the technical advantage and market competitive advantage of 3GPP standard, 3GPP officially launched the research and formulation of ——LTEAdvanced (hereinafter referred to as LTE-A) in April 2008, passed the evaluation of ITU in June 20 10, and officially became one of the main technologies of IMT-A in June 20 10.

The following briefly introduces the requirements of LTEAdvanced standard, the new technologies adopted and the latest standardization progress. Table 1 LTE-Advanced technical requirements compared with ITU-R IMT-Advanced technical requirements? LTE-A in the table refers to LTE-advanced；; IMT-A means IMT-Advanced? Performance improvement of LTE-Advanced: The downlink peak speed of LTE-Advanced reaches 1Gbit/s and the uplink reaches 500 mbit/s.. In addition to speed, LTE-Advanced has also improved in other aspects. MIMO antenna technology also provides greater performance advantages for LTE-Advanced, which enables LTE-Advanced to support the maximum bandwidth of 100MHz by aggregating up to five carriers, thus allowing more users to share the same network. ? The improvement of LTE-Advanced is not all about speed. It can reduce the cost of reaching consumers.

Because LTE-Advanced improves the load capacity by greatly increasing the number of bits transmitted per Hz in the spectrum, it realizes the communication that needs to transmit a lot of data (such as photos and videos) in a cheaper way. ? The technical parameters of LTE-Advanced are as follows: * Bandwidth: 100MHz * Peak rate: downlink 1Gbps, uplink 500Mbps * Peak spectrum efficiency: downlink 30bps/Hz, uplink 15bps/Hz * Optimized for indoor environment * Effectively supporting new frequency bands and large bandwidth applications * Peak rate is greatly improved.