This paper proposes a paradigm-shifting solution for green telecom infrastructure, addressing 5G deployment challenges through China Mobile's Green Minimalist Digital Machine Room. By integrating digital twin-based cross-vendor orchestration, adaptive AI energy optimization, and modular outdoor hardware, we achieve a 40% reduction in energy consumption and 30% decrease in OPEX-surpassing prior industry efforts in scalability and interoperability. Rigorous case studies across 30 Chinese provinces validate the model's technical feasibility, with ROI$>2.5$within 3 years. This work establishes a replicable framework for carbon-neutral telecom infrastructure under China's “Dual Carbon” policy.

Traditional indoor distribution systems in 2G, 3G, and 4G networks are mostly single-path, but the indoor distribution systems in 5G networks require dual paths to get greater capacity by space division multiplex. This document describes the reconstruction from a traditional single-path indoor distribution system to a dual-path indoor distribution system on a 5G network. Suitable scenarios need to be found in which the engineering workload is small and the cost is low, and in the scenario, a key point is that one path in the dual-path indoor distribution system would be leaked signals from nearby floors. If the level of the leaked signal is too low and the signal quality is poor, only low-order modulation modes can be used. Even if dual-stream access is provided, the download rate cannot be improved. The download rate is even lower than that of a single-path indoor distributed system. The suitable sicario in which leaked signal can support RANK 2 is discussed in the paper that 5G users can get higher throughput in the dual path upgrade indoor distribution system.

With the evolution and development of diversified businesses in the Internet of Things, the NB-IoT network is hard to support the 5G loTs. In order to speed up the recovery of industrial weaknesses, the Ministry of Industry and Information Technology pointed out in the "5G Application action Plan (2021-2023) " [1] that according to the characteristics of different versions of 5G international standards, 3GPP R17 version focuses on medium and high-speed, large-connection applications, and carries out technology, industrialization and application introduction in stages. As a "lightweight" 5G technology, RedCap with multiple characteristics such as low-cost terminal, low-power consumption, easy network evolution, and support for medium and high-speed business needs, it comes into being at the right time to promote the scale application of 5G terminals, expand the ecosystem of 5G equipment, and expand 5G application scenarios.This article focuses on the global Internet of Things evolution and market development, RedCap outlook, basic theory, practical use cases, and subsequent market outlook and other dimensions, a comprehensive and in-depth analysis of RedCap follow-up research direction, to support better market development in the future.