The ultimate goal of mobile network construction is to provide an optimal user experience with optimal network cost performance. It not only utilizes spectrum resources to deploy and build networks, but also better meets network coverage requirements and user capacity requirements at different development stages of the network. Therefore, in terms of innovative technologies in the TDD industry, China Mobile and equipment vendors have been working to improve network capacity and user perception, and to build an LTE boutique network that can serve as a global model.
Improve TD-LTE capacity
In terms of TD-LTE capacity enhancement, in recent years, many manufacturers have actively promoted the technology evolution of carrier aggregation, and participated in the test of the operator organization and the demonstration of the external field, thereby stimulating carrier aggregation to be commercialized in the LTE network as soon as possible, and improving the network. Capacity performance.
In Guangzhou in 2012, ZTE and Guangdong Mobile cooperated to realize the field verification of the first D-band in-band carrier aggregation in the industry. At the Asia Communication Exhibition in Shanghai in June 2013, ZTE demonstrated 4 of F+3D at 80MHz. *4 MIMO carrier aggregation technology, the maximum download rate is 1Gbps; in March 2014, under the organization of China Mobile, ZTE successfully completed the downlink CA IOT test in the band with commercial terminals such as Qualcomm and Marvel, and teamed up with Marvel in June. At the GTI show, an uplink CA peak demonstration was conducted with an uplink peak of 90M. The commercialization of carrier aggregation will enable operators to provide mobile users with a higher speed and richer broadband service experience, better cope with the explosive growth of data traffic and improve the competitiveness of TD-LTE networks.
Carrier aggregation technology is the core technology of LTE-A. It can combine two or more carriers in the same frequency band or different frequency bands into one channel, which can double the peak rate of TD-LTE cells: carrier aggregation makes full use of continuous and non-contiguous Continuous frequency, with frequency selective gain and joint scheduling gain, can increase the downlink rate of single users and improve system throughput. Compared with the two-carrier scheme, the primary and secondary cells using carrier aggregation technology can load more flexibly. Balance, increase user peak rate, and significantly improve user experience.
Improve TD-LTE awareness
In terms of improving TD-LTE sensing, through the accumulation and analysis of previous construction experience, more than 50% of the performance problems in LTE networks are not insufficient coverage, but the interference is too large. Therefore, for high-speed data access networks, the inter-cell interference suppression level is The key to the full performance of LTE network performance. Therefore, in order to effectively eliminate the inter-cell interference problem in the LTE network and make full use of the existing bearer network idle bandwidth resources, the industry has carried out various technical research and program verification. Among them, the Cloud Radio solution proposed by ZTE is a series of technologies that can effectively reduce LTE network interference and improve LTE network performance according to network topology (homogeneous/heterogeneous, centralized/distributed) and mobile bearer conditions.
In 2013, ZTE and China Mobile successfully deployed the Cloud Radio innovation solution on the 4G existing network in Guangzhou, and achieved significant breakthroughs in TD-LTE network performance. The field test results prove that Cloud Radio can greatly improve the performance of 4G network, and the most critical cell edge rate is more than doubled and up to 8 times, which means that Cloud Radio can help operators greatly improve edge user perception.
The deployment solution in Guangzhou for the first time implemented and validated three key technologies of Cloud Radio: downlink 8-antenna Comp (cooperative multipoint transmission), cloud scheduling (Cloud Scheduling) and P-Brige solution.
-- For the first time in the industry, the field 8 antenna Comp (cooperative multipoint transmission) is implemented.
8 antenna Comp, that is, transmitting data to the terminal through multiple cell antennas at the same time, and the terminal combines the multiple signals to achieve the purpose of enhancing the signal to noise ratio and improving the wireless transmission performance without adding hardware. After the function is activated, the cell edge throughput rate measured by the Guangzhou network can be increased by more than 1 time, up to 8 times, and the average cell throughput rate is increased by more than 20%. As the most critical performance indicator (KPI), the edge throughput has the most direct impact on user perception. The increase in average throughput, that is, the increase in network capacity, means that the operator network efficiency can be increased by 20% without increasing hardware investment. the above.
——The first cloud Scheduling application in China.
Cloud scheduling, that is, unified scheduling of multiple radio cells in a network, including time, space, frequency, and power. The resource scheduling of each cell in the traditional 4G network autonomously inevitably leads to serious inter-cell interference caused by mutual competition and conflict. The cloud scheduling scheme ensures that the probability of resource conflicts between global cells is minimized, and the significant reduction in interference levels can effectively improve network performance, especially improving the performance of the most severe cell edge regions. In the field test, the cloud edge function is improved by 40% after the cloud scheduling function is started, and the edge user perception is significantly improved.
- Innovative, leading P-Brige solution.
The application scenario of the P-Brige solution is mainly indoor coverage, and supports Ethernet transmission between the BBU and the RRU instead of the optical fiber transmission commonly used by the distributed base station. The test results prove that the P-Brige scheme can ensure that the network performance remains consistent with the original fiber transmission scheme. Because Ethernet has lower cost, and indoor scenes as a hot spot for future 4G services, there will be huge deployment requirements, so this solution can help operators significantly reduce the cost of 4G network deployment. The P-Brige solution deployed in Guangzhou not only supports Ethernet transmission optical port resources, but also supports an optical port to connect 8 Ethernet interfaces, reaching the highest level in the industry.
Cloud Radio solution deployment can achieve better user-aware value for 4G networks: First, it can bring a consistent user experience, smooth and guaranteed static or mobile experience increases user loyalty and reduces off-network and network-switching probability; It is possible to comprehensively improve network performance, convert harmful interference into useful signals, double the cell edge performance, and increase the overall throughput of the cell by 10%~30%. Third, it can reduce the network TCO, access network and bearer network. Building decoupling, the operator network investment plan is more flexible, less than one-tenth of the bearer bandwidth can get close to the fiber-to-station synergy performance gain.
China Mobile will complete the construction of more than 500,000 LTE base stations by the end of 2014, and 4G users will also increase rapidly in China. Therefore, TDD manufacturers under the leadership of China Mobile to research and promote TD-LTE innovation technology, and make full use of these key innovative technologies to build a "Ultra-Broadband + Seamless Coverage Experience" 4G network, for the commercial speed of LTE The user experience is significant.
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