Since various types of indoor 5G services will be carried by the same network using the “slicing method”, many factors need to be considered in the network construction process, and the challenges faced are great. Under a certain wireless spectrum efficiency, the edge rate of 100Mbps requires a large spectrum bandwidth, and only high frequency bands with more available spectrum resources (such as C-Band and millimeter wave frequency bands) can be used for networking; 1ms latency and 99.999% reliability The performance requirements require network architecture redundancy and coverage redundancy; one connection per square In an area with a large number of connections, capacity requirements change over time, and the network needs to have flexible capacity expansion capabilities. In indoor scenarios where service volume changes drastically and new services are activated locally, the network needs to support capacity flexibility and intelligent operations. It can be seen that building an indoor 5G network that meets the requirements of the above table will face challenges in high-frequency networking, network capacity elasticity, network reliability, and network operation and maintenance. fibconet.com fiber optic cable splitter best buy fiber optic cable splitter best buy fiber optic cable splitter best buy
- High-frequency networking has large propagation loss and penetration loss, and it is difficult to cover indoors outdoors.
ITU-R recommends using Sub 6G and microwave frequency bands to deploy 5G networks. Spectrum resources in high frequency bands can provide wider bandwidth. Sub 6G (such as 3.5GHz, 4.9GHz) and different frequency bands such as millimeter wave have different coverage capabilities. According to the law of radio wave propagation, the higher the frequency, the greater the air propagation loss, the greater the penetration loss of the wall or glass, and the more difficult it will be to cover indoors outdoors. fibconet.com fiber optic cable splitter best buy fiber optic cable splitter best buy fiber optic cable splitter best buy
- The passive distributed antenna system is difficult to evolve, with large comprehensive loss and large intermodulation interference
Passive distributed antenna system consists of power divider, coupler, feeder, ceiling antenna, etc. The currently built passive distributed antenna system does not support the 5G frequency band, and the system transformation faces huge challenges of technical infeasibility, difficult implementation, and high cost. First, the single component (power splitter, coupler, ceiling antenna) of the passive distributed antenna system only supports the Sub3G (698~2700MHz) frequency band. The results of multiple sets of sampling tests show that the Sub3G devices in the 3.5GHz frequency band are not suitable for Key performance indicators (such as insertion loss, coupling degree, standing wave ratio) cannot meet the requirements. Therefore, the single component of the existing passive distributed antenna system cannot support the 3.5GHz frequency band; it cannot support the 4.9GHz and millimeter wave frequency bands. Although the feeder can transmit 3.5GHz signals, the loss will be higher than that of Sub3G. Secondly, 5G adopts high-frequency networking, and the comprehensive loss (including passive distributed antenna system transmission loss, air loss, and partition wall penetration loss) of 3.5GHz is larger than that of Sub3G. fibconet.com fiber optic cable splitter best buy fiber optic cable splitter best buy fiber optic cable splitter best buy