TD-LTE, or long-term? Time-sharing Long-term Evolution (Time-sharing long-term evolution) is jointly formulated by the major global enterprises and operators covered by the 3GPP organization. The FDD and TDD modes in LTE standard are essentially the same, with only a small difference, and the similarity is 90%.
LTE is based on the old GSM/EDGE and UMTS/HSPA network technologies, and is an upgrade of the GSM/UMTS standard. The current goal of LTE is to improve the data transmission capacity and speed of wireless networks with the help of new technologies and modulation methods, such as new digital signal processing (DSP) technologies, which were mostly proposed around 2000.
Second, focus on different goals.
As an advanced technology, TD-LTE needs the system to further improve the peak data rate, cell edge rate and spectrum utilization, and reduce the operation and network construction costs. In order to make users get the "always-on" experience, it is necessary to reduce the delay of control and user plane.
The long-term goal of LTE is to simplify and redesign the network architecture to make it an IP network, so that there will be no unfavorable factors in the transformation of 3G networks. Because the interface of LTE is not compatible with 2G and 3G networks, LTE needs to work in different frequency bands from the original network.
Third, they have different characteristics.
(1) TD-LTE, as an important opportunity in the transition period of the communication industry, mainly includes three characteristics:
1. It contains a large number of patents from China, led by China, and has gained extensive international support and become an international standard;
2. Fast Internet access, which can reach dozens of times that of TD-SCDMA technology, making it possible to access the Internet at high speed everywhere;
3. The rapid development of the industry has basically achieved the synchronous development with other international mobile broadband technologies, representing the most advanced level of the mobile communication industry in the world today.
(Many standards in LTE are inherited from 3G UMTS updates and eventually become 4G mobile communication technologies. Among them, simplifying the network structure has become the focus of work. It is necessary to simplify the original circuit-switched and packet-switched network under UMTS into an all-IP flat basic network architecture.