Section: 6.5.1.4A Handling the maximum number of active EPS bearer contexts
Content: If the maximum number of active EPS bearer contexts is reached at the UE (see clause 6.5.0) and the upper layers of the UE request connectivity to a PDN the UE shall not send a PDN CONNECTIVITY REQUEST message unless an active EPS bearer is deactivated. If the UE needs to de-activate an active EPS bearer context, choosing which EPS bearer context to de-activate is implementation specific, however the UE shall not deactivate an EPS bearer context for emergency. NOTE: Clause 6.5.1.6 specifies that a PDN CONNECTIVITY REQUEST message with the same combination of APN and PDN type as an already existing, non-emergency PDN connection can be acceptable, in some cases. In these cases the UE does not need to de-activate an active EPS bearer context if the maximum number of active EPS bearer contexts is reached at the UE. If the UE needs to de-activate an EPS bearer context in order to request an emergency EPS bearer context, it shall either de-activate an EPS bearer context locally or via explicit signalling. If the UE performs local de-activation, the UE shall perform tracking area updating procedure to indicate EPS bearer context status to the network.