At the Barcelona show in 2011, major communication manufacturers including ZTE, Huawei, HTC, and MOTO have launched their own LTE terminal products. In terms of the 3GPP system, LTE (FDD and TDD) has become the most mainstream 4G evolution technology. The European and American markets currently mainly develop FDD technology, while the Chinese market will vigorously promote TDD technology.
According to reports, in order to improve the development strength of TD-LTE, China Mobile has already smashed more than RMB 140 billion in the construction of TD-LTE networks. Industry insiders predict that the official commercial time of TD-LTE will fall in 2013. 39% population coverage, successfully pushed TD-LTE to the mainstream of 4G standards.
Liu Guangjun, general manager of Lianxin Technology Marketing Department, said at the "2011 Mobile Terminal Technology Evolution Summit Forum" that the development of the LTE industry now faces several major bottlenecks and difficulties to be resolved:
At present, TD LTE still lacks low-band frequencies, which has a great impact on TD LTE full network coverage. At the same time, LTE multi-mode terminals have become the mainstream trend of industrial development, but the standards have not yet been unified, and the industry still needs time to form consensus.
At present, the main LTE frequency bands in the world are 2.6GHz and 790-862MHz in FDD-LTE in Europe, 700MHz in the United States and 1.5, 1.7 and 2.1GHz in Japan. In terms of TDD-LTE frequency band, China adopts 2.3GHz and 2.6GHz, and Europe adopts 2.6GHz.
Changes in the frequency band will have a greater impact on the design issues of TD LTE RF chips. Due to the relatively long development cycle of RF chips, if a new low frequency band is added to the existing high-band RF chips, it is estimated that it will take two years to reach commercial stability .
At present, there are three types of manufacturers entering the LTE chip field. The first type is traditional communication chip manufacturers. Most of them tend to support 2G / 3G / LTE multimode products. The second type is WIMAX chip manufacturers. They generally prefer single mode Chips, the third category is emerging chip manufacturers, there is no history of communication chips, just want to seize the LTE market opportunities, generally choose LTE single-mode direction but from the perspective of industry development trends, more and more manufacturers will tend to Die chip orientation.
Because there is no unified standard for multi-mode technology, each multi-mode technology is different now, "Whether to do multi-mode dual standby or multi-mode single standby, and multi-mode multi-card or multi-mode single-card are needed. The industry spends time discussing and forming a unified consensus. "Liu Guangjun believes that the 2G / 3G / LTE single RF chip needs to be optimized for at least two years or more, and it may also need to adopt some new software radio technology through software parameters. Configure to meet the needs of multi-mode and multi-mode terminals, and realize the user to customize the working mode of the terminal and select the network service operator through parameter configuration selection.
"TD-LTE single-mode technology is a key issue in the industry this year. LTE multi-mode terminals may become the focus of the industry next year, including multi-mode between LTE and 3G and 2G, as well as between other LTE standards. Multimode should be realized next year. "Liu Guangjun said.
4G applications need to accumulate user groups through the cultivation of user data business consumption habits in the 3G era. "At present, 3G needs to cultivate user habits for 4G. Without the accumulation of 3G data service users, 4G cannot be achieved overnight." Liu Guangjun believes that from 3G to 4G, operators' data service operating income should gradually replace voice services. However, at present, the business needs of mobile communication users in China are still mainly focused on voice services. It is reported that there are currently three LTE voice solutions in development, one is the CS Fallback technology similar to VoIP, the second is the Voice Call Continuity technology, which has its technical difficulties, the third VoLGA forum Leading voice service. Regardless of the development of the above technologies, GSM, which is already very mature and has excellent coverage, will continue to play an important role for a long time.
At present, 4G has not changed much in content services. The most important of the 3G data services are Internet access and video services, but now the largest data traffic in China is not video services. Internet access and chat have become the main data applications. Video streaming services have evolved into online games, but online games should only be data applications. In one direction, this crowd is relatively small after all. Ultimately, the development of data services still needs to rely on the vigorous development of video streaming services.
4G chip cost will be reduced year by year
There are many reasons for the slow development of 3G data services. The current competition between broadcasting and telecommunications for the dominance of video broadcast control services indicates that the industry is severely divided and unable to effectively integrate operations. Providing multimedia streaming and broadcasting services to 3G mobile users is another major reason. It is because the data service tariff is too high. Today's 3G online watching a movie, if calculated according to traffic, it may cost a hundred dollars, users basically can't afford it and dare not use it. Liu Guangjun said that in the future, the pricing of 4G services will mainly refer to the cost of 2G networks. The operating cost of 4G network data services is about one-tenth of 2G. If 4G is developed, it is estimated that all 2G voice services must be free .
Various applications such as video surveillance and wireless cities may be the main direction of the initial application of LTE, but this large-scale data service may first target the government and group users.
In addition to network tariffs, the cost of LTE chips is currently high. Since there is currently no mass production, the general cost is more than 100 US dollars. After achieving mass production, it is estimated that it will be close to 30 US dollars by 2012, and it may fall below 30 US dollars by 2013.
International brand manufacturers are still watching
"At present, only some large companies are involved in LTE terminal design, and some small and medium-sized companies will not intervene without mass production. Each company's LTE is mainly at the stage of strategic investment and technology preview." Liu Guangjun believes that at present, major brand manufacturers' LTE terminals are mainly some benchmark products. It is expected that this year will be mainly based on data cards, and next year there will be some high-end terminal products.
With the upgrade of the network, the performance of the terminal also mentioned high requirements. Liu Guangjun predicts that in the future, the main frequency of the CPU of 4G terminals may be 4Ghz. In addition, under the application of large amounts of data, the power consumption needs to be further reduced. The manufacturing process of the chip also needs to enter the 20nm era quickly. The system architecture of the chip is likely to need it. advanced optimization.
TDD LTE operators generally recognize that patents are no longer the bottleneck for LTE development
"Each of the above problems is difficult to solve, like several mountains." But Liu Guangjun also said that in addition to industrial bottlenecks, industrial development opportunities are also obvious:
Liu Guangjun believes that because the global distribution of LTE patents is very scattered, there will be no one-size-fits-all phenomenon. It is not realistic to rely on a chip company to solve all IPR problems. Obviously, it needs to be achieved through the problem of patent cross-exchange. At present, Chinese manufacturers Datang, ZTE, and Huawei have many related patents and all have their own voices.
Operators have generally recognized TD-LTE, TDD is already a recognized international standard, and now more than a dozen foreign operators have promised to build TDD networks.
Because the frequency band and operating cost of TDD are relatively lower, and because the patents are more scattered, IPR has relatively no high threshold, which can attract more operators and developers to join.
The promotion of TDD is mainly China Mobile, which is backward compatible with TD-SCDMA. In addition, China is also developing the 3G enhancement technology HSPA +, and currently in Europe is mainly developing WCDMA dual-carrier, this 3G enhancement technology will become the mainstream technology for a long time.
At present, it should be a smooth transition from 3G to 3.75G to 4G. 3G cultivates user habits for 4G. Without this gradual process, LTE cannot succeed out of thin air. Liu Guangjun said that Lianxin is currently fully committed to the research and development of TD LTE and TDD enhanced technologies, and it is expected that TDD / FDD compatible LTE products will be launched next year.
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