This project is the construction of the national 4G network by Shanghai Branch of China Telecom Co., Ltd., giving full play to the advantages of LTE advanced technology in 4G networks, combining the telecommunications optical network structure and integrating BBU pool into the LTE wireless network architecture, realizing "intensive" full-service operations that combine fixed communications based on optical networks and mobile communications in the new 4G era, reducing network operating costs and accelerating network construction. An LTE network construction model with Shanghai Telecom's characteristics has been formed, and the project has created huge benefits for China Telecom:

1. Combined with existing "optical network" resources, a strategy of centralized deployment of BBUs (baseband units) in existing optical network office rooms has been formulated and implemented to give full play to telecommunications's unique optical network advantages.
2. Innovatively proposed Cloud BBU networking architecture and multi-layer networking solution based on centralized deployment of urban optical networks and BBU.
3. As of the end of 2014, a total of 3500 LTE outdoor macro base stations centrally deployed by BBUs had been opened. From the analysis of economic benefits, compared with the traditional macro base station construction model, the centralized deployment method of BBU office can reduce the supporting construction investment of 184,600 yuan per outdoor macro base station on average, saving investment of 646 million yuan as of the end of 2014. Centralized deployment of BBU offices can reduce maintenance costs. Based on the large-scale use of 400 offices by these base stations, the maintenance costs are at the level of one million yuan. If not centralized deployment, only the computer room rental fee is included. Each macro base station can save cost expenditures of 30,000 yuan/year, and it is estimated that annual maintenance costs can be saved by 74 million yuan.
4. Changing the traditional base station construction model has reduced the need for computer rooms when selecting sites, avoided some base station addressing difficulties, greatly reduced construction costs and accelerated construction speed.
5. Achieve "intensive" full-service operations that combine fixed communications based on optical networks and mobile communications in the new 4G era, reducing network operating costs.
6. The optical network's central office computer room has a high level of security and a safer bearer network, which enhances the robustness of the LTE network.
7. The evolution process of Cloud BBU's networking solution consists of three steps: centralized deployment, network collaboration, and network pooling. It adapts to the development trend of LTE advanced technology and meets the application requirements of multiple functions, such as CoMP, eICIC functions, CA, and SFN functions., laying a good foundation for subsequent network optimization and quality improvement.
8. LTE network Cloud BBU deployment supports multi-layer networking and increases flexible deployment of network construction. In terms of base station site selection, the Cloud BBU networking solution can achieve flexible site selection, flexibly configure cells to cover needs, and can conduct refined site planning and selection through simulation methods to improve network investment efficiency.
9. The LTE Cloud BBU networking solution is in line with the development trend of 5G networks and creates conditions for the smooth transition of LTE networks to 5G networks.
   application and promotion
   In accordance with the evolution route of the Cloud BBU networking architecture, Shanghai Telecom has implemented centralized deployment of BBUs across its entire network and realized collaborative deployment of commercial networks in two regions. It is implementing collaborative network deployment in 53 high-value and high-quality areas. By the end of 2015, important business districts and venues in Shanghai will achieve network collaboration and greatly enhance the user experience in high-quality areas. The deployment model of Cloud BBU provides a model for the deployment and construction of BBU by China Telecom and even other operators. has good social benefits.