The significant increase in base station density required by the evolution from 4G to 5G raises site acquisition difficulty and network construction costs. In addition, the dense deployment of base stations causes severe co-channel interference, and user experience significantly deteriorates at cell edges. The cloud radio access network (C-RAN) architecture was developed to address these challenges. Its centralized BBU deployment simplifies site acquisition and reduces the number of required devices and power supplies at sites, lowering costs for rentals, energy, and equipment rooms. Centralized BBU collaboration significantly improves performance at cell edges. These features make C-RAN the important wireless network construction mode for the future.
C-RAN fronthaul requires CPRI/eCPRI bearer with high bandwidth and ultra-low latency. Large numbers of optical fibers are consumed if direct fiber is used to meet these requirements.
Huawei's E2E CPRI/eCPRI over OTN solution increases fiber resource utilization several times over, improves network reliability by using hitless protection schemes, and provides efficient O&M management. These characteristics make it the optimal C-RAN bearer solution for the evolution from 4G to 5G.
It is well known that optical fibers are valuable and have limited availability with long construction periods and high investment costs. As global infrastructure construction matures, the construction of new pipes and installation of fiber distribution terminals (FDTs) becomes increasingly complex, raising the optical fiber deployment costs, especially in the large numbers required for the high-density terminal devices deployed on 5G-oriented C-RAN networks. These factors make optical fiber resources inadequate on the access side, causing a bottleneck to network deployment.
Huawei is taking the lead in providing a full-outdoor 5G WDM transport solution. In this solution, OptiX OSN 810 supports the hybrid transmission of CPRI 2 to CPRI 7, eCPRI, Ethernet, OBSAI, and SDH services. The product is compact and light, consumes low power, and meets IP65 protection requirements. It supports outdoor installation on poles or walls, or with RRUs. This solution provides integrated end access devices and implements high-bandwidth C-RAN bearer with features including no extra site location and easy deployment. Based on CPRI/eCPRI over OTN, Huawei's solution maximizes optical fiber resources, increasing the capacity of one pair of optical fibers by tens of times by using WDM. It also extends the transmission capacity from tens to hundreds of gigabits per second. This solution uses Huawei-proprietary chips and industry-leading algorithms to achieve ns-level high-precision clocks, fully satisfying the requirements of evolution from 4G to 5G.
100G bandwidth, CPRI/eCPRI interface, ultra-low latency, and high-precision clocks to meet fronthaul bearer requirements for 5G
Fewer fiber resources consumed to reduce CAPEX; configuration-free fronthaul services and various OAM overheads to simplify O&M and reduce OPEX
Full-outdoor design, zero site installation, and configuration-free service after power-on shorten the network construction period
Support hybrid transmission of CPRI, eCPRI, Ethernet, OBSAI, and SDH services
The OptiX OSN 810 is a WDM-based full-outdoor active transport device. It can be used for service transmission on metro C-RAN networks and supports hybrid transmission of CPRI 2–CPRI 8, GE/10GE LAN, OBSAI, and SDH services.