What is Mobility Management states in GPRS

The GPRS Mobility Management determines if the user equipment is registered to the network or not. In another words, it defines if the network knows about the presence of the user equipment or not.  

In addition, if the user equipment is registered to the network, to which extent the network can determine the location of the user equipment. If it is to the cell level, or only to the routing area level.

Mobility Management states
Mobility Management states in GPRS

GPRS Mobility Management states in 2G network 'MM states'

The GPRS Mobility Management states in 2G network are named the 'MM states'.

There are three MM states of a user equipment accessing the network through 2G network. Those states are,

  • IDLE
  • STANDBY
  • READY

IDLE state

  • In GPRS Mobility Management (MM) IDLE state, the network didn't register the user equipment.
  • Therefore, the network doesn’t know about the presence of the user equipment.

STANDBY state

  • In GPRS Mobility Management (MM) STANDBY state, the network registered the user equipment.
  • Therefore, the network knows the location of the user equipment.
  • However, the network knows the user equipment location only to the routing area level, it doesn't know which cell under this routing area the user equipment is currently using.

READY state

  • In GPRS Mobility Management (MM) READY state, the network registered the user equipment. Therefore, the network knows the location of the user equipment.
  • In addition, the network knows this location to the most accurate level, which is the cell level.

GPRS Mobility Management states in 3G network 'PMM states'

The GPRS Mobility Management states in 3G network are named the 'PMM states'.

There are three PMM states of a user equipment accessing the network through 3G network. Those states are,

  • PMM-DETACHED
  • PMM-IDLE
  • PMM-CONNECTED

PMM-DETACHED state

  • In PMM-DETACHED state, the network didn't register the user equipment.
  • Therefore, the network doesn’t know about the presence of the user equipment.

PMM-IDLE state

  • In PMM-IDLE state, the network registered the user equipment.
  • Therefore, the network knows the location of the user equipment.
  • However, the network knows the location only to the routing area level, it doesn't know which cell under this routing area the user equipment is currently using.

PMM-CONNECTED state

  • In PMM-CONNECTED state, the network registered the user equipment.
  • Therefore, the network knows the location of the user equipment. In addition, the network knows this location to the most accurate level, which is the cell level.

Information

Later, we will go deeper into the transition between MM states and PMM states.