Dongguan Pinji Electronic Technology Limited , https://www.iquaxusb4cable.com
Under the unified deployment of China Mobile Communications Group, the third phase of TD-SCDMA (referred to as TD) is nearing completion. With the joint efforts of all teams and personnel, the construction of the TD network is progressing at a speed that was unimaginable during the GSM era. However, due to various objective challenges such as the massive scale of the project, the maturity of equipment, and the increasing difficulty in site negotiations, the engineering construction of the TD network has faced numerous obstacles. In response, Hunan Mobile has shown great determination and initiative. By adopting new technologies and products, they have developed innovative strategies, reduced construction difficulties, accelerated progress, and lowered overall costs.
In macro base station construction, most TD devices now use a compact BBU+RRU configuration. The main innovation lies in the outdoor antenna feeder unit. The TD base station employs a smart antenna with a wide panel, which not only occupies significant rooftop space but also raises concerns among property owners about radiation. As a result, finding suitable locations for TD base stations has become challenging. To address this, Hunan Mobile actively collaborated with urban management and garden departments, using streetlight pole base stations and beautified tree base stations to improve coverage and accelerate construction. Testing confirmed that the coverage performance was excellent.
The new feeder connector box plays a vital role in TD construction. Since the TD base station uses an eight-element smart antenna, each feeder connects nine feeders to the RRU, resulting in 18 connectors per sector. Traditionally, waterproofing these connections using tape was time-consuming and visually unappealing, taking approximately two hours per sector. Hunan Mobile introduced the feeder connector box, which allows for quick installation—about 20 minutes per sector. The box uses a "super gel" technique to ensure effective waterproofing. This method significantly improves efficiency, speeds up the project, ensures reliable waterproofing, and simplifies future maintenance.
In indoor coverage base station construction, traditional fiber optic cables connecting the BBU to the RRU still have limitations, such as poor mechanical properties like tensile strength and resistance to wear. Deploying these cables in complex environments like towers and underground pipelines is time-consuming and inefficient. For tower-based scenarios, multiple field cables are typically needed, increasing construction complexity and delaying progress. Moreover, harsh conditions can lead to issues like fiber breakage or excessive optical loss, causing delays in station activation.
Hunan Mobile implemented a node-distributed optical cable solution, which is suitable for both visible and invisible environments, such as inner tube towers, indoor pipelines, and buried installations. This solution includes a fiber connector box, multi-core dry optical cable (12-core), and pigtail. Each connector box can support up to six dual-core optical cables, making it ideal for three-sector macro stations. It also allows for easy replacement of faulty cables without re-laying, reducing downtime and improving efficiency.
Due to the BBU+RRU distributed deployment, signals are transmitted via fiber, extending the radio distance. This reduces network construction costs and allows the RRU to be placed closer to the antenna, minimizing feeder loss and increasing signal output power. However, in indoor coverage scenarios, the RRU is often far from the equipment room. Long-distance power supply leads to voltage drop and high energy loss. To solve this, Hunan Mobile used the integrated small switching power supply ZXDU58, effectively addressing the RRU power supply issue. This system is robust, adaptable to harsh environments, and features centralized monitoring and battery management, ensuring reliable operation in unattended settings.
In microwave remote station construction, transmission has always been a key factor in network development. Traditionally, optical fiber was the primary method, but with the rapid growth of mobile communication, especially after the release of 3G licenses, the speed of transmission systems could not keep up with network expansion. The microwave remote system offers a solution by enabling faster site selection and construction, improving network quality and user experience. It works by converting RF signals into intermediate frequency signals, transmitting them via microwave, and then converting them back at the remote end. Hunan Mobile's adoption of this technology has helped streamline the process and enhance the TD network's performance.