This document discusses key aspects of providing Quality of Service (QoS) and priority access for public safety in LTE networks. It covers:
1. Controlling access to the air interface through mechanisms like access class barring which allow reserving access for priority users.
2. Controlling the use of network resources by mapping applications to EPS bearers that have QoS Class Identifiers and Allocation Retention Priority levels assigned.
3. Ensuring roaming and handover do not impact the QoS and priority access provided to public safety users.