Due to the limited number of RRUs connected by BBUs and limited remote signal distance of optical fibers between BBUs and RRUs in the 5G-R system,and in view of the difficulties in the construction and maintenance of long tunnels,the 5G-R system coverage scheme for long tunnels deserves special attention under the condition of no BBU in the tunnel.On the basis of a survey of the equipment manufacturers and an analysis of the published technical conditions of the 5G-R system,this paper firstly analyzes the characteristics and networking method of 5G-R base stations.It then studies the link budget of and proposes a RRU setting interval for the 5G-R system in tunnels.In view of the scenarios of long tunnels of different lengths,it finally provides suggestions on the coverage scheme for the 5G-R system in tunnels of different lengths under the condition of no BBU in the tunnel.
维普
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