Distributed Wireless Cell for High-Speed Railway Coverage

The patent divides the cell network into multiple distributed RRUs (Remote Radio Units) connected in a cascading manner, where each RRU covers a specific segment of the railway line. This segmentation allows the network to achieve extended coverage area through multiple units while each unit maintains strong signal strength in its local coverage zone, avoiding the signal attenuation problem of a single large-cell approach.

The patent directs the coverage of each RRU specifically towards the railway line where high-speed trains operate, creating a focused coverage pattern rather than omnidirectional coverage. This local quality approach ensures that the network resources are primarily utilized by train users while minimizing coverage in directions where non-train users might access the network.

By segmenting the network into multiple RRUs positioned along the railway, the patent ensures that each RRU is close to the trains in its coverage zone. This reduces the distance between the transmitting antenna and the mobile terminal, thereby minimizing signal attenuation loss despite the overall extended coverage area achieved through the cascading RRU configuration.

The patent makes each RRU multi-functional by enabling it to provide both coverage for high-speed trains and coverage for ground users simultaneously. The RRUs operate in a cascading manner to create continuous coverage along the railway while maintaining standard cell structure, thus achieving extended cell stay time without requiring a completely separate dedicated network infrastructure.