MPS is applicable in EPS and 5GS systems.
MPS provides priority treatment to increase the probability of an authorized Service User's Voice, Video, and Data communication session being successful. Some form of priority treatment is applied to the MPS invocation and session establishment, and continues to be applied until the MPS session is released. The priority treatment may be applied before the invocation if a greater probability of success in receiving, recognizing, and processing the invocation is needed.
MPS allows qualified and authorized users to obtain priority access to the next available radio channel on a priority basis before other PLMN users, during situations when PLMN congestion is blocking session establishment attempts. In addition, MPS supports priority sessions on an "end-to-end" priority basis.
MPS is intended to be utilised for Voice, Video, and Data bearer services, including the Data Transport Service, in the Packet-switched (PS) domain and the IP Multimedia Subsystem (IMS). It also involves priority transitioning of MPS service (e.g., Voice) to the CS domain when the network does not support the requested service in the PS domain. MPS Voice, Video and Data sessions are based on providing priority treatment to the corresponding commercial services offered to the public.
MPS is also intended to be utilized for IoT communications through machine interactions that may not directly involve a human Service User.