C-RAN WDM Bearer Solution

In the LTE/LTE-A era, significantly increasing base station density leads to a sharp increase in network construction costs. In addition, carrier aggregation used to improve mobile bandwidth rates causes co-channel interference and therefore user experience at cell edges greatly deteriorates, a centralized radio access network (C-RAN) architecture has been developed to address these issues. Its centralized BBU deployment effectively reduces network construction costs, and centralized BBU collaboration significantly improves performance at cell edges. These features make C-RAN the mainstream wireless network construction mode for the future.

However, the C-RAN deployment mode requires a large number of optical fibers, large-bandwidth CPRI connections, and low latency.

Huawei's CPRI over WDM/OTN E2E solution significantly increases optical fiber resource utilization, improves network reliability, and provides highly efficient O&M management, making it the optimal C-RAN bearer solution in the LTE/LTE-A era.

As global infrastructure construction matures, laying optical cables becomes more expensive, especially in the large numbers required for the high-density terminal devices deployed on LTE/LTE-A C-RAN networks. These factors make optical fiber resources inadequate, creating a bottleneck to network deployment.

The OptiX OSN 1800 solution based on CPRI over WDM/OTN maximizes optical fiber resources. WDM can increase the capacity of one pair of optical fibers by 10 or even 40 times, increasing capacity to beyond 10G or even 100G and satisfying current and future bandwidth requirements. In addition, WDM technologies transmit CPRI services transparently, which guarantees their requirements on clock jitter and synchronization and therefore satisfies high-quality cross-station synergy requirements on wireless devices.

The evolution of 3G to LTE shortens the distance between base stations from 1.5 km to 0.5 km while increasing the number of base stations at an exponential rate. The network construction objective is also transformed from mere coverage into providing high-quality networks. Wireless devices are densely deployed in areas with expensive rents where equipment rooms are rarely constructed, such as shopping centers and indoor offices. In this situation, Huawei is taking the lead in providing a full outdoor CPRI WDM transport solution. In this solution, CPRI Xpress-OptiX OSN 810 supports hybrid transmission of CPRI 2 to CPRI 7, Ethernet, and OBSAI services. The product is highly integrated and light, consumes low power, and meets IP65 protection requirements. It supports outdoor installation on pole or wall or with RRUs. The solution provides ideal LTE/LTE-A C-RAN bearer by its features of no extra site location and high capacity.

Larger Bandwidth

Upstream bandwidth of a single site reaches 50G–400G and satisfies long-term LTE service requirements

Fast Network Deployment

Outdoor CPRI Xpress deployment shortens the site deployment period by 50% and helps customers quickly provision LTE services

Higher Reliability

E2E SNCP ring protection and compensation for the latency difference of working and protection trails ensure hitless switching and normal running of services when optical fibers are broken

Lower TCO

CAPEX is reduced by greatly reducing the number of optical fiber resources. Various OAM overheads implement simplified O&M and reduce OPEX

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