If Japan is 3G the first to develop a person to eat crab, then Korea 4G on the road can be said to be the most active market, the three operators in SKT, LGU + , KT has in July 2011 and in January 2012 began offering LTE services, and this year launched LTE-A service. So, Signals Research Group (SRG) CEO and founder Mike Thelander became a Korean regulars.
SRG is a US-based research organization dedicated to offer the wireless communications industry frontier research and exclusive consulting services to its most famous research entitled “Signals Ahead” research report, and it causes the entire wireless ecosystem global business user’s attention.
LTE is naturally Mike Thelander long a subject of concern, he believes that the basic requirements of 4G is significantly improved, enhanced base spectral efficiency margin bit rate significantly increased, the radio access network network test is less than 10 milliseconds, scalable bandwidth. Turning to the TDD , Mike Thelander, noted, TDD has been used for the Wi-Fi , Bluetooth and many other wireless technologies. “Select FDD or TDD, always depending on the target application available frequencies and TDD .FDD happens can be used for LTE, and thus supports two duplex mode in a standard medium.”
Therefore, the two have a lot in common. The same core network, the same high-level design, but there are slight differences in the “when” processing tasks, but there is no difference in the content of the work, manner or cause. “LTE-A also includes the use of the concept of LTE-TDD development.” Mike Thelander said, “image descriptor, TDD is a bridge with lights to support two-way traffic, and FDD with two bridges to carry two-way traffic . ”
However, the introduction of the service is based on FDD LTE-A service launched three South Korean operators, so as “Signals Ahead” chief analyst Mike Thelander in August this year to deploy the LTE TDD and LTE FDD’s Softbank network conducted a field experience.
“Softbank LTE TDD uplink and downlink use the same 20MHz frequency spectrum, LTE TDD network higher than the LTE FDD network of about 600MHz.” Mike Thelander said: “The four days spent 124GB of traffic, quite a five-year customer traffic measured showed higher LTE TDD downlink data rate, but a lower upstream data rate. it is also more dependent on the configuration of the operator’s band, which is flexibility TDD deployment, and allocate more time for carrying more multiple downstream data flow. ”
Highly versatile two kinds of duplex modes help ensure a successful deployment of the two models and the widespread use of the data, to the end of 2013, 93 countries worldwide will deploy 260 LTE networks, which, the TD-LTE network has 18 one, to build a network in more than 50.
“Most operators deploy LTE FDD, some operators deploy LTE TDD, a small number of carriers deploy two kinds of duplex modes, but in the end all the major carriers will support both duplex mode in its network with .LTE FDD in a wide range of coverage, 2G and 3G spectrum frequency spectrum available for reallocation;. out of network capacity considerations, LTE TDD unpaired spectrum can be applied to the situation in the high-frequency band used ”
As we all know, the Chinese government will soon issue 4G licenses, Secretary Xie Feibo Radio Authority in the recent ITU Telecom World ‘s keynote used a detailed description of the introduction of China TDD spectrum planning, allocation of TD-LTE scale test frequencies to individual operators Suppliers are as follows: China mobile 1880 -1900 MHz, 2320-2370 MHz, 2575-2635 MHz, China Unicom, 2300-2320 MHz, 2555-2575 MHz, China Telecom 2370-2390 MHz, 2635-2655 MHz; at the same time, the Chinese government is actively consider 1.4GHz, 3.5 GHz TDD for subsequent development, research and explore the 50GHz band for more than meet future broadband mobile communication development needs.
First awarded three TDD license has become the consensus of the industry, while China Mobile basically hopeless to get LTE FDD licenses, the number of users has more than 700 million of China Mobile in solving a wide range of LTE coverage is bound to encounter challenges. In this regard, Mike Thelander expressed: “TDD questions on network coverage is not due to the technology itself, for China Mobile is concerned, as well as 2G and 3G spectrum resources, you can slowly migrate, but must deploy LTE-FDD another. aspect, network deployment in China needs more base stations, high-band spectrum covering a wide range of non-inferiority, however, the deployment of more base stations does not affect network performance. ”
Language South Korea South Korea’s Mike Thelander carriers have launched LTE-A service praised Canada. “Data can be sent simultaneously on two different radio channels, with wider channels and higher data rates, of course, require a higher level of modem to take advantage of network performance.”
LTE chip manufacturers in promoting the development of the vital Qualcomm Inc. has announced the first 20-nanometer process-based cellular modem MDM9X35, network support 6 highest 40MHz LTE TDD and FDD Category global carrier aggregation deployments, download speeds of up to 300Mbps. Meanwhile, Qualcomm also announced the industry’s first to support LTE carrier aggregation LTE Category 4 embedded mobile computing solution.
According to Dr. Te-Won Lee, vice president of Qualcomm Korea introduced Korea’s famous southern regions, the demand for data services is very large, every 6-10 months, data traffic will double. “Future 5–8 years, due to strong demand for data traffic, 1000 times the data growth will become a reality next year, South Korea’s LTE-A will deploy more features, such as Eicic, small base stations will see in the Korean market. South Korea’s experience will give hope to other global markets demonstration effect. “