GGSN Behavior with PDP Activation Failures and No GTP Echo Responses. Available Languages. Download Options. PDF (76.8 KB). A create PDP context request with GTPv1 is established. The GTPv1-to-GTPv0 handoff occurs. The call on the GGSN is now at GTPv0.
Here in this chapter I have tried to depict how a MS establishes PDP connection with CoreNetwork in order to use PacketServices of the 3G network.
- GPRS Attach and PDP Context Activation (GPRS Attach and PDP Context Activation for a Class B Terminal) GSM Coverage. The PDP context activation procedure to obtain the IP address for the device. The Access Point Name (APN) specified by the service provider is passed as a parameter.
- The packet data protocol (PDP; e.g., IP, X.25, FrameRelay) context is a data structure present on both the serving GPRS support node (SGSN) and the gateway GPRS support node (GGSN) which contains the subscriber's session information when the subscriber has an active session. When a mobile wants to use GPRS, it must first attach.
Pdp Context Activation Gprs
Courtesy :- 3G specifications and past experience.
For PDP connection to be established a MS has to first get attached to the network. Refer Attach Proceure for more details.
![Pdp Pdp](/uploads/1/2/4/7/124796045/400204997.jpg)
MS sends Activate PDP context request to the SGSN. On receiving this request SGSN checks subscriber information (via ISD from HLR) stored in MM context( created during attachProcedure). After passing subscription checking SGSN initiates DNS query to resolves the APN ( Access point name ) received in APCR. This resolved IP is nothing but address of GGSN or PGW(LTE).
Every APCR has QOS parameter which indicates BitRate for uplink and downlink connections. SGSN checks these parameters with the SusbcriberInfo QOS and comes to negotiable value for QOS.
After these checks and getting the address of GGSN, SGSN constructs a GTP-C messages of createPDPcotextRequest and sends it to the GGSN.
Some main parameters in this request are
- TEID:
- QOS Negotiated
- APN:
- MSISDN:
- NSAPI:
- And other charging information
In response to this, GGSN sends createPDPContextAccept to SGSN with TEIDs, PDPAddress.
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Refer 23.060 page 187-189
SGSN now initiates RABAssigment procedure and instructs RNS to allocate a radioresource for this UE. This response contains UTEID, DTEID, RAB ID etc.
Remington 7400 serial number search. After successful allocation of RAB, SGSN sends ActivatePDPContextAccept message with NSAPI, PDPAddress, GGSN address, QOS Negotiated to the MS over RANAP DirectTransfer Message
Following diagram depicts the APCR ( acticatePdpContextRequest) procedure.
- NAS : Non-Access-Stratum
- DT1 : SCCP’s DataForm1 message
- DT : RANAP’s Direct Transfer message
- NSAPI : Network service Access Point Identifier
- APCA : Acitvate PdpContextAccept
Pdp Context Activation Wikipedia Free
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