Coexistence between radio access networks (military radars) and radio military radars has proved difficult despite the fact that they are two different radio services. Radio access networks require a lot of spectrum, and military radars have a relatively small frequency allocation. In order to avoid interference, both systems have to work together. There are many questions about their coexistence. Documentary research was done to determine if coexistence solutions were possible.
Three main components were required for the research process. The first part of the research was to analyze the current situation with radio access networks (military radars) and military radars. To assess the feasibility and viability of coexistence, experts were interviewed. Third, they looked at the technologies that could allow for coexistence of radio access networks and military radars.
Military radars have limited operation transparency, making coexistence difficult for them. They also use frequency hopping to avoid detection and interference. They may also need state-ofthe-art filtering methods. Their equipment may also need to be sent only when it is needed. Additionally, they might need to give the necessary data to a shared base.
However, experts emphasized the importance of cross-industry coordination and the need for higher involvement from the economy and policy. Experts also suggested the adoption of agreements that use shared data bases and radar imaging results to increase individual radar image accuracy. Experts mentioned the US's CBRS in the 3 - 3.7GHz band as an example for coexistence of radio access networks and radars.
The experts evaluated the most practical coexistence methods and ranked them on a scale of 1-10. The highest rankings were given to the resource allocation coexistence, the location-based coexistence, and the cognitive radio coexistence methods. Researchers also discovered that there were two types of methods: coordinated and uncoordinated, depending on how information was shared between them.
Researchers also examined the conditions for frequency coexistence of military radars with radio access networks. They discovered that the primary prerequisite is the secondary users' ability detect and avoid the presence primary users. Secondary WAS, including RLAN users, must change to another channel within ten seconds of radar activity detection. Additionally, users must conduct a regular check of channel availability.
These studies demonstrate that military radars can coexist with radio access devices. The technology is still in early stages of development and some methods may not be efficient enough to avoid interference. Therefore, more research is needed to find effective methods for spectrum sharing.
Researchers found that the most viable coexistence options between military radars, radioaccess networks, and radioaccess systems are resource allocation coexistence. They also recommend location-based techniques, cognitive radio coexistence, and location-based method. But there were safety concerns.