The so-called cross-licensing is more common between the patentees of improved patents and basic patents. On the premise of having two valid patents, the patentee of the improved patent must use the basic patent when using its patented technology, and the patentee of the basic patent also needs to use the improved patent when using its patent. Both parties cross-license for their own convenience and interests. As a result, both parties have implemented each other's patented technology.