Integrated antenna upgrading TD-SCDMA Construction Method

1 Introduction

When engineers in city A use common RRU to work on the antenna tower, engineers in City B are using more advanced integrated RRU, make the overall deployment site fast and beautiful-This brings about a cost reduction of nearly 3000 yuan for a single site.

In the construction of TD-SCDMA (hereinafter referred to as "TD") project, the antenna and the RF unit of the base station must be connected through multiple cable feeds, complicated installation, reduced sensitivity, and inconvenient maintenance and replacement. In this regard, the design of an integrated TD antenna combining the antenna and the base station RF Unit has received much attention. The integrated antenna has good reliability and stability, and has some advantages over ordinary antennas in reducing the damage of the cable feed connector, beautifying the appearance of the antenna, and facilitating installation and maintenance.

2. The traditional website construction method is in urgent need of change

The current antenna area construction method determines that a lot of work should be carried out on the Tower Site. Engineers must pay special attention to engineering details, such as waterproofing and bending of feeder. The Installation Level of on-site engineers is uneven, which makes the actual installation effect unable to be guaranteed. The installation process and quality of different sites are even more difficult to meet Unified Specifications, this poses a hidden danger to the operator's network maintenance in the future.

When a carrier builds a brand new site, the construction process is complicated. It takes about 2 hours for the feeder connection and waterproofing, and the network replacement and maintenance may take a longer time. Although the LNA (Low Noise Amplifier, Low Noise Amplifier) and radio frequency Separation Tower drop-down solution reduces the size of the antenna feed a lot, the problems that operators need to consider during construction have not been reduced, in the face of ever-changing customer needs, the disadvantages of traditional website construction methods are exposed, and changes are urgently needed.

Traditional rru rf cables) and antenna installation face many problems, mainly reflected in the following aspects:

1) reliability issues. Each time a base station is installed, engineers need to prepare 54 1/2 feeder connectors for waterproofing at the site, which are used for connecting the antenna and RRU. There is a high risk of installation quality. Replacing an RRU requires at least 4 ~ 5 h, reducing network reliability.

2) power waste and reduced sensitivity. Because the connection jumper between the RRU and the antenna and the jumper inside the antenna increase the RF power loss of 1.2dB, the receiver sensitivity of 1.2dB is reduced.

3) Cost issues. Traditional jumper, waterproof tape, mortar, and shrink pipe costs, installation and maintenance labor costs, and network failure costs are high.

4) The installation environment is limited. Many feeders, bending, and other requirements have high requirements on the installation environment.

5) Appearance problems. "Beard" (27 RRU-to-antenna feeders per station) and "tumor" (RRU profile highlighted ).

In the face of so many problems, dingqiao Application Integration RRU simplifies the construction of base stations.

3. Integrated antennas sound the horn of Reform

The launch of Nokia Siemens communication integration RRU solution comes from the active cooperation with China Mobile, which is the result of the concerted efforts of both parties in the TD industrialization process. The integrated RRU research project, under the impetus of China Mobile, jointly established a Joint Research Group, launched a commercial version of RRU 268i (Integrated RRU), and completed a series of tests and verifications.

The Nokia Siemens communication integration RRU 268i consists of antennas, positioning connectors, and RRU. It provides two methods: Direct lifting and RRU installation on the tower.

RRU 268i supports fast and easy installation at high altitude to meet the installation requirements of various scenarios. By reasonably arranging the Antenna Coupling disk and the filter location, removing all cable feeders between the RRU and the antenna, the product "three in one" for connection, waterproofing, and fixation, and setting the on-site assembly time from 2 ~ 3 h can be shortened to about 10 min, while greatly reducing the cost of installation materials, installation labor, and maintenance labor.

It is worth noting that the RRU 268i does not need to change the software and hardware design. It inherits the mature and stable commercial platform and reduces 18 waterproof connectors (which reduces 18 fault points ), improved by 1.2 ~ Actual coverage gain of 1.5dB. The engineer can adjust the suspension position of the antenna to ensure free adjustment of the antenna inclination. The integrated design facilitates product disassembly and assembly, and ensures that the carrier does not change the antenna inclination and no additional network optimization work during RRU maintenance.

In addition, the appearance of RRU 268i simplifies and beautifies the sky, reduces the site selection requirements, and does not add additional installation space. RRU 268i solves many problems of the traditional TD antenna and RRU, this includes low project security, low environmental adaptability, difficult installation and maintenance, special waterproof reinforcement, and strong visual impact.

4. Continuous innovation focuses on openness and integration

Product installation is faster, maintenance is simpler, product appearance is more beautifying, and more stable functions are the constant pursuit of Nokia Siemens communication R & D products, truly adding value to operators. The integrated RRU solution is a major innovation that focuses on customers' key needs and will bring considerable benefits to mobile operators.

After Long-term R & D, testing and verification, the integrated RRU product, dinqiao, a subsidiary of Nokia Siemens Communications, also analyzed the front and side Windward load of the integrated antenna, the wind pressure, construction and installation plan, and Rod specifications in various regions were analyzed. The experimental results show that the integrated mode is superior in terms of wind resistance.

Integration RRU has been launched for more than half a year, but is affecting the construction of the TD network. Nokia Siemens communication has deployed a certain number of integrated RRU In the Haikou Region of TD Phase II, its ease of installation, maintenance, and high reliability have been preliminarily verified. It is expected that the operator will deploy more integrated RRU in the next phase.

"Openness and Integration" will be the main theme for the TD industry to strengthen independent innovation. New challenges from integrated RRU electronic adjustment and integrated RRU camouflage require not only mobile operators to take the lead in organizing equipment specifications and test specifications, but also promote the development of integrated RRU, in addition, we must fully explore the concept of "integration" and apply it on a large scale. In addition, how can the integration product form be further evolved to improve the compatibility of different products; how can the integration connector interface be further standardized to improve the interconnection capability of different products. All these problems require extensive cooperation from all parties in the industry, integrating advantageous resources, and jointly exploring the path to large-scale deployment of TD.

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