Posts Tagged sgsn

What is PDP contexts?

PDP context

is

for PS service.

It consists of

1. RAB

2. CN bearer (bearer between SGSN and GGSN)

The PDP context is created with a defined QoS that is requested by the UE and granted by the network.

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What is RAB?

RAB (Radio Access Bearer)

is

created to provide user plane data transfer.

RAB comprises

1. RB and

2. connection from the SRNC to the SGSN (Iu bearer).

The RAB is created on reequest from the SGSN with a specific QoS request.

For a given UE, there can be multiple RABs per NAS service (speech or PS data service).

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