Session Management states in GPRS (2G and 3G)

For an MS to be able to send and receive data to and from the PDN, it must have an active PDP context. The 'PDP context' exist on the MS, the SGSN, and the GGSN. This PDP context can be in one of two states. Those two states are the Session Management 'SM' states.

Session Management 'SM' states

The SM sates are 'INACTIVE' and 'ACTIVE'.

INACTIVE state

In this state, the MS can’t send or receive data to and from the PDN.

ACTIVE state

In this state, the MS can send and receive data to and from the PDN.

Session Management states
Session Management states

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Transition between ACTIVE and INACTIVE states

Moving from ACTIVE to INACTIVE,

An ACTIVE PDP context moves to INACTIVE state when,

  • 'PDP deactivation' procedure is initiated.
  • The MM state of the MS moves to IDLE in 2G, or PMM-DETACHED in 3G.

Information

Later, we will dicuss the process of 'PDP deactivation'.

Moving from INACTIVE to ACTIVE,

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