On November 15, the LTE Global Ecosystem Development Seminar was held in Beijing. Competent departments, international organizations, operators, telecommunications equipment vendors, chip manufacturers, etc. carried out in-depth discussions around "global vision, win-win cooperation". The important consensus reached by the conference is "the same world, the same 4G". Ms. Huang Yuhong, Vice President of China Mobile Research Institute, said, "LTE TDD and FDD are actually unified standards." Mr. Alan Hadden, Chairman of the Global Mobile Equipment Suppliers Association (GSA), said, "Because LTE is a globally unified and common standard, LTE Both FDD and TDD network deployment and user terminal manufacturing can greatly benefit from LTE's global economies of scale. "
The same world, the same 4G
Mr. Qian Jinqun, president and deputy secretary general of China Communications Enterprise Association, said at the meeting that LTE, as a global standard, can be more flexible and make full use of spectrum resources. The similarity shared by the FDD and TDD models exceeds 90%. He also said, "At present, some leading operators are already working on FDD and TDD convergence networking, which will also become the mainstream trend in the development of 4G industry." The Director of Science and Technology Department of the Ministry of Industry and Information Technology, Xiaohui Hui, said In the future development of LTE, FDD and TDD will be a system, but only use different technical methods to achieve business. "
As one of the earliest companies involved in the formulation of LTE technical specifications, Qualcomm of the United States was invited to attend the meeting. Qualcomm ’s Global Senior Vice President and President of Greater China Wang Xiang said, "3GPP first released the LTE specification 3GPP Release 8 at the end of 2008. Qualcomm has been studying in the OFDMA field for 8 years. "Wang Xiang said that in the earliest and most basic patents of the OFDMA system, Qualcomm has a lot of accumulation, and most of them are applicable to both FDD and TDD two modes.
Regarding "the same 4G", Wang Xiang said that the standards in the 3G era are not compatible with each other. "And the LTE era is very different. LTE is a global standard that supports two duplex modes, respectively LTE FDD for paired spectrum. And LTE TDD for unpaired spectrum. There is only a very small necessary difference between the two duplex modes. FDD uses frequency division duplexing and TDD uses time division duplexing, both of which are well-known duplexing technologies. "
LTE is a global standard based on the technical specifications published by 3GPP. Single carrier FDMA is used for uplink and OFDMA is used for downlink. Both paired and unpaired spectrum deployments are applicable. The LTE standard supports two duplex modes, FDD for paired spectrum, and TDD for unpaired spectrum. Based on the experience of managing 3G networks, in order to avoid market fragmentation, leading global operators have promoted LTE as a universal standard from the beginning to support FDD and TDD modes. There are only very small necessary differences between the two modes. Looking back on history, Mike Thelander, CEO of Signals Research Group, said, "At the earliest, operators said that the 4G era should minimize the differences in physical layers. TDD and FDD have very high commonality. Operators said at the time, our current assumption is that To develop a unified and single technology to ensure that in the next generation of wireless communication networks, both paired and unpaired spectrum can be used at the same time. "
Ms. Huang Yuhong, Vice President of China Mobile Research Institute, said, "Every manufacturer does not want to develop a separate industrial line, only doing TDD or only FDD, because only by making it a unified platform and unified product can the economy be maximized. Benefits. "Regarding benefits, GSA Chairman Alan Hadden also believes that under the same standard, FDD and TDD network deployment and user terminals can benefit from the overall LTE ecosystem. Regarding the experience of mixed operations, Alan Hadden pointed out that according to the current state of the global spectrum, networking using the two modes of LTE TDD and FDD is becoming more and more common. The data shows that there are currently 23 LTE TDD networks commercially available in the world, and another 60 LTE TDD networks are under construction or deployment. It is worth noting that 11 of the 23 LTE TDD networks were launched by operators who have deployed LTE FDD. This includes China Mobile (Hong Kong), Softbank (Japan) and Russian MTS.
3G / LTE long-term coexistence
The conference data also shows that 1240 LTE terminals have been released globally. It is worth noting that more than 99% of LTE smartphones support LTE / 3G multi-mode at the same time. The long-term coexistence of 3G / LTE networks and the support of multi-mode and multi-frequency by intelligent terminals have long been recognized by operators.
At the network level, LTE can take advantage of new and wider spectrum resources and is designed to achieve seamless interoperability with 3G networks and their evolution technologies, which can guarantee operators to make full use of existing 3G network investments. Therefore, in the future, LTE and 3G and their evolution technologies will coexist for a long time, providing consumers with ubiquitous broadband coverage and the best experience.
At the terminal level, Beijing Mobile started selling 4G LTE mobile phones earlier. The first two models used Snapdragon processors to support LTE / 3G multimode; and the recently launched Nubia Z5s is based on 4G LTE / 3G. "Netcom" is the main buying point, using Snapdragon 800 processor and Qualcomm RF360 front-end technology. Internationally, observe the newly launched LTE machines, multi-mode multi-frequency is a must. Nexus 5 supports LTE / CDMA / WCDMA / GSM, HTC One Max supports LTE TDD / LTE FDD / TD-SCDMA / WCDMA / GSM, etc. . Ms. Huang Yuhong, vice president of China Mobile Research Institute, said, "In the LTE stage, multiple frequency bands and multiple modes will become the standard configuration for 4G mobile phones."
Regarding "multi-mode multi-frequency", Wang Xiang, senior global vice president and president of Greater China, said that "Qualcomm has launched the industry's first LTE / 3G multi-mode chipset. At present, Qualcomm's LTE chipset supports the world 7-mode, more than 40 frequency bands plus 17 LTE voice modes, which can be seamlessly switched between modes. "He also introduced the RF360 front-end solution that has attracted much industry attention. It supports 7-mode and more than 40 frequency bands. A single mobile terminal supports the design of all 4G LTE standards and frequency bands worldwide.
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