non-GBR Bearer refers to "non-Guaranteed Bit Rate" Bearer. It is a type of data bearer in 4G mobile network that does not have a guaranteed minimum bit rate. So that the actual bit rate of the user can vary based on network conditions and availability of resources.

non-GBR bearer provides a best-effort delivery of data packets. So that network may drop or delay non-GBR data packets if the network is congested or if resources are limited.

This type of bearers is suitable for non-real-time data applications, such as web browsing and file downloads. This is because these applications can have delay and variation in data rates without significantly impacting the user experience.