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. Each system must be compatible in order to avoid interference. There are many questions about their coexistence. Documentary research was therefore conducted to see if any coexistence solutions might be possible.
There were three parts to the research method. The researchers first examined the current situation in military radars, radio access networks and other related technologies. Second, they interviewed experts to assess the feasibility of possible coexistence methods. Third, they examined possible technologies to allow coexistence between military radars or radio access network.
Because they are not transparent in their operation, coexistence can be a problem for military radars. They also use frequency-hopping to avoid interference. They might also require state-of the-art filtering techniques. It may be necessary for their equipment to send only when they're 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 suggested that agreements be made to share data bases and use radar imaging results. This would improve individual radar imaging accuracy. As an example of possible coexistence between radio access networks (radars and radio), the experts mentioned the US CBRS operating in the 3.55 to 3.7 GHz band.
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. The researchers also found that the methods were categorized into uncoordinated and coordinated methods, depending on how information was exchanged between the systems.
Researchers also investigated the preconditions of frequency coexistence among military radars and radio access networks. They identified that the primary precondition is the ability of the secondary users to detect and avoid the presence of the 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 show that there is a lot of potential for coexistence between radio access systems and military radars. This technology is still very early in development. The methods currently being studied may not be sufficient to prevent interference between the systems. To find effective spectrum sharing methods, further research is necessary.
The researchers found that the most feasible methods for coexistence between military radars and radioaccess networks are the resource allocation coexistence, the location-based methods, and the cognitive radio coexistence methods. However, there were also some safety concerns.