WD5M18590900 Huawei Huawei SingleRAN BTS3900/DBS3900 Radio Remote Unit

The Huawei WD5M18590900 is an RRU5909 Remote Radio Unit designed for multi-mode operation on the 1800MHz frequency band. This radio unit supports concurrent GSM and LTE transmission, enabling mobile network operators to deploy both 2G and 4G services from a single hardware platform through software-defined radio technology.

The RRU5909 is part of Huawei’s distributed base station architecture, connecting via CPRI fibre to a centralised Baseband Unit (BBU). This configuration is deployed across macro cell sites, rooftop installations, and tower-mounted scenarios where the radio head is positioned close to the antenna to minimise feeder loss and improve signal quality.

As a multi-mode unit, the RRU5909 series was developed to support network modernisation and spectrum refarming projects, allowing operators to transition legacy GSM spectrum to LTE whilst maintaining 2G coverage. This model is now considered legacy equipment as operators have progressed to more recent RRU generations and 5G deployments.

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