Research On Key Technologies Of Spectrum Sharing In Wireless Private Network Based On Carrier Aggregation

230MHz frequency band is the private network frequency band to meet the electricity and related industry users' demand. The frequency band is mainly for the relevant data transmission radio devices under electricity dedicated network to acquire and upload data. These devices not only with low data transmission rate, but also leads the relatively low spectrum utilization efficiency in the actual scene in terms of time and space. With the rapid development of intelligent electricity network, more and more devices will access this spectrum to achieve mass data operations, such as remote control, video surveillance and so on. So LTE230 technology came into being, to a large extent to solve the problem of low data speeds and improve the 230MHz band spectrum efficiency. But the mutual interference problem caused by the multi-system have become increasingly apparent, which need to be solved quickly.In this paper, the coexistence of multi-systems in wireless private network is studied by combining carrier aggregation technology in LTE-A and opportunistic spectrum access technology in cognitive radio. The main contents are as follows: Firstly, the background of the smart electricity network in 230MHz frequency band and the research status of the private network and related technologies are introduced. Then, the carrier aggregation technology in LTE-A is introduced briefly. Next, the opportunistic spectrum access technology and its time domain model are introduced. And the collision probability and the total channel capacity of the coexistence of the master system and the cognitive system under the special network frequency band are analyzed theoretically. Finally, based on the link-level simulation software and related instruments, a semi-physical spectrum sharing simulation platform is built, simulating the coexistence scenario of multi-system in the private network frequency band and spectrum sharing problem. Experimental results The spectrum sharing performance of the main system and the cognitive system is analyzed. The research of this paper is of value in the research of spectrum sharing of narrowband system and broadband system in 230MHz private network.