On June 26, 2013, at ZTE ’s MAE (Asian Mobile Communications Expo) held in Shanghai, the industry ’s first live demonstration of F + D cross-band 4 carrier carrier aggregation (CA) demonstrated a rate of 1Gbps. This demonstration uses 4 carriers to implement cross-band carrier aggregation, of which 3 carriers work in the 2.6G band and 1 carrier works in the 1.9G band. This is another technological leap after ZTE successfully demonstrated F + D cross-band carrier aggregation to reach a peak rate of 430Mbps in Beijing in February.
Carrier aggregation is the core technology of LTE-A. It can combine two or more carriers in the same or different frequency bands into a single channel to increase the peak rate of TD-LTE cells by a factor of two. At the same time, the technology can also effectively avoid co-channel interference in neighboring cells, improve TD-LTE network performance, more flexibly achieve load balancing between primary and secondary cells, and increase network capacity. The application of carrier aggregation technology can enable operators to provide mobile users with a higher speed and richer service experience, better cope with the explosive growth of data service traffic, and improve the competitiveness of TD-LTE networks.
Cross-band carrier aggregation is part of the 3GPP R11 version. Compared with the same-band carrier aggregation technology, it is more difficult to implement. In January of this year, ZTE and China Mobile achieved the first D-band carrier aggregation test under the environment of the Guangzhou expanded test network, and the outdoor environment test rate reached 223Mbps. Then a new breakthrough was achieved. In February, the Shangri-La Hotel in Beijing focused on the industry ’s first F + D cross-band carrier aggregation function, with a test rate of 430Mbps.
2013 is the first year of TD-LTE large-scale network construction. The TD-SCDMA network resources can be used to quickly upgrade the TD-LTE network in the F-band, but the F-band has only one 20MHz frequency point. To achieve capacity expansion to meet mid- to long-term business development needs, it can also double the TD-LTE network carrying capacity, enhance load balancing between different frequency points, and improve network performance. Realizing F + D cross-band 80MHz carrier aggregation is a strategic technological breakthrough. This demonstration of the 4-carrier F + D cross-band carrier aggregation function further embodies ZTE ’s leading strength in TD-LTE, and more importantly, for China Mobile ’s subsequent large-scale F + D joint networking and frequency resource integration And effective use provides strong technical support and basis.
ZTE continues to invest in the research and innovation of LTE ultra-broadband solutions. In addition to cross-carrier CA, it recently released a RRU with a 100M bandwidth. The RRU can support up to 5 20MHz carriers, which is the world ’s first truly RRU that complies with the LTE-A standard.
ZTE takes the lead in TDD technology and has always been in the leading position in the commercialization of technology and systems in the field of TD-LTE. As of June 2013, ZTE has built TD-LTE experimental bureaus and commercial networks with 48 leading operators in 33 countries, covering Europe, India, CIS, Asia-Pacific, Southeast Asia and other regions, 15 of which are commercial contract.
The RGB Color Controller is in a predetermined order to change the main circuit or control circuit wiring and circuit changes the resistance value to control the motor start, speed, braking and reverse master device to control RGB color.
Cumbersome, complex structure, once the design is complete, you can not modify or expand, but it's fast. Micro-controller design program easy, simple structure, convenient to modify or expand, modify a machine instruction function, simply restated the corresponding micro-program;
To add a machine instruction, just add some micro-control program in memory, however, RGB Color Controller is through the implementation of a micro program.
Specific comparison is as follows: a combination of hardwired logic controller, also known as the controller, by the logic circuit, relies entirely on hardware to achieve the function of the instruction.
Basic components to RGB Color Controller:
(1) the instruction register is used to store instruction being executed.
(2) Operation code decoder: instruction opcodes for decoding to produce the corresponding control level, to complete the analysis function of the instruction.
(3) Sequential Circuits: used to generate a time stamp signal.
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