Traditional deep coverage construction scheme: BBU+RRU or digital optical fiber repeater.
Deep coverage is difficult
Due to the difference in transmission loss in different frequency bands, it is difficult for traditional coverage to achieve dual-network balance on the one hand, and it is difficult to better coordinate the relationship between FDD LTE network capacity and coverage radius on the other hand.
A large number of passive components are used in traditional room divisions, which are prone to aging, which can easily cause degradation of network coverage and blind spots.
Project construction is difficult:
High dependence on information sources. However, the main equipment purchase cycle is long and the flexibility is low.
The traditional room division has a long period from design to construction/renovation and delivery, and does not have the capacity for subsequent expansion and evolution.
Many management problems:
The traditional indoor distribution network uses a large number of passive components, and there is no centralized network management, and network problems cannot be found in time.
Indoor coverage and outdoor deep coverage are separated, and it is difficult to coordinate management of problems.
Traditional coverage construction solutions are difficult to sustain in the LTE era. The digital optical fiber distribution system RAS came into being.
The DAS system is composed of the main unit (source access), expansion unit, and remote unit. The specific parameters are as follows: