Enhanced Multi-Level Precedence And Pre-emption Service
The enhanced Multi-Level Precedence and Preemption service ( eMLPP ) is a service in GSM - UMTS - and LTE - mobile networks that implements beside different connection priorities and fast connection the possibility of preemption of users and applications.
description
The service implements the following additional services in a cellular network:
- Precedence (German ranking ) includes the assignment of a connection priority to each voice and data connection and a fast connection establishment
- Preemption (German preemption ) comprises the displacement of low priority connections by higher-priority connections
- Connection of the MLPP performance feature of the ISDN network in accordance with ITU -T I.255-3
function
Each voice or data connection can be assigned one of 7 priority levels by the user ; alternatively, a priority level is assigned by the network. Each priority level can also be granted preemption authorization , which in this case means the suppression or termination of lower priority calls.
In addition, each connection request can be classified in one of three speed classes, which influence the speed at which the connection is established:
- class 1 for quick connection establishment (1-2 seconds)
- class 2 for normal connection establishment (less than 5 seconds)
- class 3 for slow connection establishment (less than 10 seconds)
Using this information, the cellular network can react accordingly:
- If no more channels are free when a connection is being established in a radio cell , a call with a lower priority can be ended to make a channel free. The connections with the lowest priority are terminated first. This can also happen if a connection with a higher priority is to be transferred to the radio cell by handover .
- Depending on the settings in the end device, an appropriately prioritized connection can be automatically accepted. If the user is already conducting a call and the incoming connection is a voice call with a higher priority, the call that has already been made can either be ended or put on hold .
- In the interest of quick call setup, the network can dispense with user authentication and the use of encrypted transmission or only use them later in the connection.
These procedures are used not only for direct voice and data connections , but also for VBS and VGCS calls.
The default values set by the user on the end device for connection priority, speed class and automatic call acceptance are checked by the end device each time a connection is established and stored in the SIM card .
Individual evidence
- ↑ 3GPP TS 22.067: enhanced multi-level precedence and preemption service (eMLPP); Stage 1 ( English , ZIP / DOC; 45 kB) December 20, 2009. Accessed December 31, 2009.
- ↑ ITU I.255-3: ISDN General structure and service capabilities; The multi-level precedence and preemption (MLPP) ; As of July 2, 1990 (accessed: January 1, 2010)
- ↑ 3GPP TS 23.067: enhanced multi-level precedence and preemption service (eMLPP); Stage 2 ( English , ZIP / DOC; 186 kB) December 18, 2009. Accessed December 31, 2009.
- ↑ 3GPP TS 24.067: enhanced multi-level precedence and preemption service (eMLPP); Stage 3 ( English , ZIP / DOC; 55 kB) December 18, 2009. Accessed December 31, 2009.