LTE - Default Bearer vs. Dedicated Bearer
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The first EPS bearer created between the UE and the PGW, to connect the UE, to a certain PDN, is called the default EPS bearer. while the network can create one or more dedicated EPS bearers , that are linked to the default EPS bearer. and every dedicated EPS bearer is having its own quality of service, to serve a certain application or service that requires a special quality of service characteristics.
and the UE and the PGW will use the TFTs ,in order to determine the service data flow, that will be handled by each dedicated EPS bearer.
and the dedicated EPS bearer connects the UE to the same PDN, and it is having the same PDN address as the default EPS bearer, but it has different quality of service profile, than the default EPS bearer.