With the rapid development of mobile broadband, antennas have an increasingly greater impact on network performance and user experience. How to choose the most suitable antenna when deploying TD-LTE network to ensure the best network performance and thus ensure the user experience is a growing concern of TD-LTE operators.
Traditional antennas encounter 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 often encounter the following challenges if they use traditional antennas.
Dual-band network performance is difficult to achieve optimally at the same time. Since the original FA frequency band is different from the newly added D frequency band coverage, the coverage of the D frequency band is about 18% relative to the FA frequency band under the same downtilt angle, and the mechanical downtilt mode is used to adjust, which easily affects the neighboring area. Coverage, interference, and TD-LTE cell edge user experience cannot be guaranteed. The survey data of a city in the first phase of TD-LTE shows that the antenna direction angle and downtilt angle of 68% FA and D-band co-site construction need to be adjusted in the engineering optimization, otherwise the performance will drop by 35%.
The space in the sky is tense. In today's multi-band coexistence, the tight space in the sky has become a prominent problem encountered by operators when deploying TD-LTE networks. According to the survey data, in central cities such as Shanghai and Beijing, about 50% of the sites will not be able to build TD-LTE independent antennas due to limited space and different owners.
Management is inefficient. Traditional antennas are large in size. Operators not only have difficulty in site selection and cable installation at the beginning of construction, but also need to manually shut down the site to adjust the antenna downtilt. It is time-consuming and labor-intensive, and it is difficult to make network adjustments for beautification sites.
It is difficult to manage the antenna weight, which may cause the cell coverage to be inconsistent with expectations. The traditional antenna weight setting method is manually set by the site installer during site construction. However, the weights of different antenna manufacturers are different. Once the weight is set incorrectly, the broadcast beam distortion of the smart antenna will cause deformation of the cover, which will seriously affect the network performance.
FA/D dual-frequency independent electric adjustable antenna came into being
The FA/D dual-band independent ESC antenna has become the best antenna solution for operators to build high-quality TD-LTE networks by virtue of their unique advantages in network performance, installation and deployment, and remote management.
Dual network independent ESC to ensure optimal performance of dual-band network
The FA/D dual-frequency independent electrical tune antenna can independently adjust the antenna downtilt angle for the FA band and the D band, so that different frequency bands can achieve the same coverage effect, and the TD-LTE network performance in different scenarios is optimized. The actual live network test shows that compared with the FA/D built-in non-electrical adjustment antenna, when the D-band coverage is increased, the performance of the FA/D dual-frequency independent electrical adjustment antenna is greatly improved by 16%, which is equivalent to the performance of the independent antenna; In the case of downdip, the lateral interference control capability is much better than the traditional mechanical downtilt antenna, and the average edge throughput rate of the cell edge is increased by 28%.
Small size, easy to deploy, solve the problem of site selection and property coordination
The FA/D dual-frequency independent electronically tuned antenna adopts the most advanced array multiplexing technology in the industry, and the FA and D frequency bands are multiplexed in one array. Compared with the traditional multi-frequency antenna, the number of arrays is reduced by half, and the internal modules are optimized. The antenna size and weight are reduced to a greater extent, which is comparable to the size of a conventional single-frequency antenna.
In general, as the frequency band increases, the corresponding matching port needs to be added, but there is not enough space at the bottom of the antenna, and too many ports may make the installation of the antenna extremely inconvenient. In order to solve this problem, the FA/D dual-frequency independent electrical tune antenna uses cluster cable technology in the antenna port and RRU connection section, and integrates 18 ports on the antenna end 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 electronically-tuned antenna can realize remote down-tilt adjustment on the network management platform through the remote ESC module, which solves the difficulty for maintenance personnel to perform on-site maintenance and improves management and maintenance efficiency. In addition, the FA/D dual-frequency independent electronically adjustable antenna also has a remote automatic identification function of the ESC module, which avoids complicated operation steps such as configuration data loading and recording module related information, thereby greatly reducing the operator's OPEX.
One deployment, the most money-saving
Compared to two separate deployments of single-frequency antennas, the “one-time deployment†FA/D dual-band independent electrical tune antenna can reduce the cost of antenna deployment by 30%, including antenna cost, antenna installation, property coordination, and pole-holding. Civil construction, floor rent, etc.
Innovative weight storage solution to maximize the value of ESC antennas
The weight is a quantitative representation of the specific excitation signal applied by each port of the antenna. The purpose is to obtain a pattern with a specific coverage effect, and the weight can be expressed in amplitude or phase mode. In the case that the network coverage is deteriorating due to the chaos of the existing network weights, 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 device during the site configuration to implement the antenna. The automatic configuration of weights greatly reduces the complexity of site configuration, avoids the possibility of manual setting errors, and improves network performance.
At present, the weight storage technology has been written into the AISG standard. With the global scale 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-frequency independent electronically modulated antennas have been fully tested and verified in many cities across the country. The verification results show that compared with traditional multi-frequency antennas, FA/D dual-frequency independent electrical tune antennas are used in network performance, installation and deployment. And remote ESC management has obvious advantages. With the wide application of FA/D dual-frequency independent electrical tune antenna solutions, industry-leading antenna manufacturers have also introduced such solutions, which will accelerate a new wave of TD-LTE network deployment.
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Yetnorson Antenna Co., Ltd. , https://www.yetnorson.com