US Patent 11844131 Wireless backhaul link information via adaptation layer

A base station distributed unit (BS-DU) receives, from a base station central unit (BS-CU), at least one configuration message comprising bearer configuration parameters of at least one bearer for a wireless device, wherein the at least one bearer is configured between the wireless device and the BS-CU through the BS-DU. The BS-DU communicates, with the wireless device and via the at least one bearer, a first adaptation layer packet, wherein a first header of the first adaptation layer packet comprises a route identifier indicating a route. The BS-DU determines a failure of a link between the BS-DU and the BS-CU and transmits, to the wireless device, backhaul link information indicating the failure of the link, wherein a second header of a second adaptation layer packet comprises the backhaul link information indicating the failure of the link.