Techniques are described herein for using unlicensed assisted access aggregated band to improve direct communication channel bandwidth reliability in a vehicle-to-everything (V2X) communication. The techniques include a (wireless communication) device that uses a first licensed band to perform a cellular network communication through a first interface (e.g., Uu), and further uses a shared spectrum to perform the V2X communication through a direct communication channel interface. The device then monitors and compares a bandwidth requirement of the V2X communication with a bandwidth of the shared spectrum. In response to the bandwidth that is less than the bandwidth requirement, the device selects at least one second licensed band to be aggregated with the shared spectrum to generate the unlicensed assisted access aggregated band. In some embodiment, the device adjusts the first licensed based on the selected least one second licensed band to avoid channel interference.