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Départ. Technical support- CM640
PHILIPS Consumer
Communications
Centre du Mans
7.9.5
GPRS Attach and GPRS Detach procedures
The procedure for a GPRS attach is made by the MS to the SGSN. After Having executed a successful GPRS
attach, mobility management contexts are established in the MS and the SGSN, setting the MS in the READY
state. The MS is then able to activate PDP-contexts. The procedure of GPRS attach is illustrated below.
1. The MS sends a GPRS attach request which includes the GPRS mobile class and the multislot class.
2. Authentication is carried out in the same manner as with GSM, but instead of the MSC, it's the SGSN that
sends the IMSI of the MS to the HLR, initiating the encryption algorithm.
3. A location update procedure stores the current SGSN of the MS in the HLR.
4. The attach accept response assigns a Temporary Logical Link Identity (TLLI) to the MS.
5. A GPRS attach complete response from the MS to the SGSN confirms the attach.
After the authentication within the GPRS attach procedure, no additional authentication is required during the entire
GPRS-session. A GPRS detach will terminate the ongoing GPRS-session. This detach could be initiated explicitly
by the MS or the SGSN, or implicitly when the STANDBY-timer runs out.
PHILIPS ELECTRONICS N.V. 1999
All rights reserved. Reproduction in whole
or in part is prohibited without the written
consent of the copyright owner.
PROCEDURE
MS
1. Attach Request
2. Authentication
4. Attach Accept
Response
5. Attach Complete
GPRS attach procedure
Service Repair Support
SGSN
3. Location Update
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VY-V-640-82x
Page : 21 of 71
Langue : EN
Date : 25/02/03
HLR
VY-V-640-82x
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