With the rapid development of mobile broadband, antennas have a greater and greater impact on network performance and user experience. How to choose the most suitable antenna when deploying a TD-LTE network to ensure the best network performance and thus to ensure the user experience is a growing concern of the majority of TD-LTE operators.
Traditional antennas are in a dilemma in the TD-LTE era
Since 2013, the global TD-LTE network has entered a period of vigorous development. In the deployment of TD-LTE networks, operators using traditional antennas often encounter the following challenges.
Dual-band network performance is difficult to achieve optimal simultaneously. Since the coverage of the original FA band is different from that of the newly added D band, under the same downtilt angle, the coverage of the D band shrinks by about 18% relative to the FA band, and the mechanical downtilt adjustment is used to easily affect the neighboring area Coverage and interference can not guarantee the user experience of TD-LTE cell edge. According to the survey data of a city in the first phase of TD-LTE, 68% of the antennas in the FA and D bands in the project optimization need to be adjusted for the antenna directional angle and downtilt angle, otherwise the performance will be reduced by 35%.
Sky space is tight. In today's coexistence of multiple frequency bands, the tight space has become a prominent problem encountered by operators when deploying TD-LTE networks. The survey data shows that in central cities such as Shanghai and Beijing, due to limited space in the sky and disagreement by the owners, about 50% of the sites will not be able to build new TD-LTE independent antennas.
Management efficiency is low. Traditional antennas are bulky. Operators not only have difficulty in site selection and cable installation in the early stages of construction, but mechanical adjustment of the antenna downtilt also requires the site to be specifically closed and manual adjustment, which is time-consuming and labor-intensive. It is also difficult to adjust the network for beautified sites.
Antenna weights are difficult to manage, which can easily cause cell coverage to be inconsistent with expectations. The traditional antenna weight setting method is set manually by site installers during site construction. However, the weights designed by different antenna manufacturers are different. Once the weights are set incorrectly, the broadcast beam of the smart antenna will be distorted and the coverage will be deformed, which will seriously affect the network performance.
FA / D dual-band independent ESC antenna came into being
With its unique advantages in network performance, installation and deployment, and remote management, FA / D dual-band independent ESC antennas have become the best antenna solution for operators to build high-quality TD-LTE networks.
Dual-network independent ESC to ensure optimal performance of dual-band network
The FA / D dual-band independent electrically adjustable antenna can independently adjust the antenna downtilt angle for the FA frequency band and the D frequency band, so that different frequency bands achieve the same coverage effect, and ensure optimal performance of the TD-LTE network in different scenarios. The actual live network test shows that compared with the FA / D built-in combined non-electrically adjustable antenna, when the D-band coverage is increased, the networking performance of the FA / D dual-band independent ESC antenna is greatly improved by 16%, which is equivalent to the performance of the independent antenna; In the case of downtilt, the lateral interference control capability is far superior to the traditional mechanical downtilt antenna, and the average throughput rate at the cell edge is increased by 28%.
Small size and easy deployment, solving the difficulty of site selection and property coordination
The FA / D dual-band independent electrically adjustable antenna adopts the most advanced array multiplexing technology in the industry, multiplexing the FA and D frequency bands on one array, which reduces the number of arrays by half compared with traditional multi-band antennas, and optimizes the design of internal modules The antenna size and weight are reduced to a greater extent, which is comparable to the size of traditional single-frequency antennas.
In general, as the frequency band increases, the corresponding matching ports need to be added, but there is not enough space at the bottom of the antenna. Too many ports will also make the installation of the antenna extremely inconvenient. In order to solve this problem, the FA / D dual-band independent ESC antenna uses cluster cable technology at the connection port between the antenna port and the RRU. The 18 ports at the antenna end are integrated into four, which simplifies installation and reduces visual pollution on the tower.
Remote ESC to improve management and maintenance efficiency
The FA / D dual-frequency independent ESC antenna can realize remote downtilt adjustment on the network management platform through the remote ESC module, which solves the difficulty of maintenance personnel needing to go to the site for maintenance and improves the efficiency of management and maintenance. In addition, the FA / D dual-band independent ESC antenna also has the remote automatic identification function of the ESC module, avoiding the cumbersome operation steps such as configuration data loading and recording module-related information, thereby greatly reducing the operator's OPEX.
One deployment, the most cost-effective
Compared with two separate deployments of single-frequency antennas, the “once deployment†FA / D dual-band independent ESC antenna can reduce antenna deployment costs by 30%, including antenna cost, antenna installation, property coordination, and pole, Civil construction, floor rent, etc.
Innovative weight storage scheme to maximize the value of ESC antennas
The weight is a quantitative representation method of the specific excitation signal applied to each port of the antenna. The purpose is to obtain a pattern with a specific coverage effect. The weight can be expressed as an amplitude or a phase. In order to solve the problem of network coverage deterioration caused by chaotic weight configuration on the current network, the innovative weight storage scheme stores the weight information of the antenna in the antenna in advance, and automatically reads the weight of the corresponding antenna through the base station equipment during site configuration to realize the antenna The automatic configuration of weights greatly reduces the complexity of site configuration, avoids possible errors in manual settings, and improves network performance.
At present, the weight storage technology has been written into the AISG standard. With the global application of TD-LTE, the weight storage solution will play an important role in improving network performance, improving efficiency, and reducing maintenance costs.
At present, FA / D dual-band independent ESC antennas have been fully tested and verified in many cities across the country. The verification results show that, compared with traditional multi-band antennas, FA / D dual-band independent ESC antennas have been used in network performance, installation and deployment , Remote ESC management and other aspects have obvious advantages. With the widespread application of FA / D dual-band independent ESC antenna solutions, industry-leading antenna manufacturers have also launched such solutions, which will surely accelerate the new wave of TD-LTE network deployment.
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