SEOUL -- LG Uplus, a leading mobile service provider in South Korea, and Huawei, a leading global information and communications technology (ICT) solutions provider, today announced that they will take the lead in using WDM/OTN technology for common public radio interface (CPRI) backhaul on LG UpLus’s LTE-A network, marking a breakthrough in the field of LTE-A backhaul technology. The CPRI-over-WDM/OTN solution enables pooled baseband processing for distributed base stations, saving fiber resources and improving network reliability.
The solution is a typical application of the “WDM/OTN-to-the-edge” idea in LTE backhaul scenarios.
As a mobile broadband pioneer committed to “100% LTE”, LG UpLus was among the first to commercialize LTE-A in the industry and promises to provide first-class LTE services to customers. LG UpLus extensively adopts pooled baseband processing for distributed base stations on its LTE-A network, to maximize bandwidth and spectrum efficiency, minimize interference caused by coverage overlap, and occupy less footprint. It is estimated that a centralized baseband processing pool in dense metropolitan areas should connect to over 100 remote radio units (RRUs).
Traditionally, the RRUs are directly connected to the pool using fibers. This requires considerable fiber resources and does not allow service protection configurations.
Thanks to continuous research in the WDM/OTN field, Huawei broke new ground by innovatively using WDM/OTN technology for LTE backhaul. Only a single fiber pair is required to backhaul multiple CPRIs from RRUs to the baseband processing pool, greatly saving fiber resources. OTN ring protection for the CPRIs, which is based on unique delay compensation technology, greatly enhances network reliability.
Additionally, OTN allows for accurate line performance monitoring and fault diagnosis.