According to one configuration, a wireless network is shared amongst a hierarchal tier of users. The wireless network environment includes one or more allocation management resources (such as so-called spectrum access systems). Each of one or more wireless network service providers operating respective wireless equipment such as one or more wireless base stations relies on a respective allocation management resource to allocate wireless channels for use. If desired, a respective wireless network service provider operating respective equipment can select an appropriate channel notification mode suitable to provide notification of incumbent use and/or reassignment of wireless bandwidth to the wireless base stations. In such an instance, in the event of re-assignment due to incumbent use, the allocation management resources communicate amongst each other regarding the incumbent use/reassignment and provide protected use of newly assigned wireless bandwidth to the first wireless network service provider.