GPRS Access Modes - General Packet Radio Service (GPRS)

What is GPRS Access Modes?

User authentication is needed or not at the access point to a Public Data Network (PDN) is defined by GPRS access modes. Below are the options for the access modes-

  • Transparent - No security authorization/authentication is requested by the GGSN.
  • Non-transparent - GGSN acts as a proxy for authenticating user.

Only PDP type IPv4 follow the GPRS transparent and non-transparent modes.

Transparent Mode

This mode do not access authorization and authentication of the user. Operator address or any addressing space of domain is given to the Mobile User. This address is given while subscribing to the network as a static address or at PDP activation as a dynamic address. Dynamic Host Configuration Protocol (DHCP) server in the GPRS network allocates the dynamic address. User authentication is done in the GPRS network, no RADIUS authentication is performed apart from IMSI-based authentication.

Non Transparent Mode

GPRS PLMN is responsible for intranet/ISP authentication of the MS which means Non-transparent access. Password Authentication Protocol (PAP) or Challenge Handshake Authentication Protocol (CHAP) are used in Non-transparent access. They are issued by the mobile terminal and piggybacked in the GTP PDP context activation message which is used in building a RADIUS request to the RADIUS server in conjunction with the access point name (APN).

GPRS Access Point Name

Access Point Name (APN) is a network identity which identifies a PDN that can be accessed from a GGSN node in GPRS network. The APN is configured on the GSN node by the operator to access the targeted network.

  • Access point – It defines the APN and the characteristics that includes DHCP, security (RADIUS) and DNS services.
  • Access point list – a logical interface with the virtual template.
  • Access group - Defines whether access is permitted between the PDN and the MS.

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General Packet Radio Service (GPRS) Topics