3gpp tsg geran wg4 #4 G4-010330 Sophia Antipolis, France




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3GPP TSG GERAN WG4 #4 G4-010330

Sophia Antipolis, France

22 April – 26 April 2001
Source: 3GPP TSG-GERAN WG4 GPRS

To: 3GPP TSG-CN1

Title: GPRS attach type in NMO I
The GERAN WG4 GPRS group have been discussing this subject in relation to a number of the GMM test cases and wish to understand the use of the different types of attach when the MS under test does not perform an automatic attach and also the use of the type “GPRS attach while IMSI attached”. The questions are mainly related to R97. Below are what the group considers the only references from 04.08 version X, (rel ‘97), on the subject: -

Extract 1

4.1.1.2.1 GPRS MS operating in mode A or B in a network that operates in mode I

If the network operates in mode I, GPRS MSs that operate in mode A or B and wish to be or are simultaneously IMSI attached for GPRS and non-GPRS services, shall use the combined GPRS attach and the combined and periodic routing area updating procedures instead of the corresponding MM specific procedures IMSI attach and normal and periodic location area updating.

NOTE: A GPRS MS operating in mode A or B in a network that operates in mode I, shall perform the combined GPRS attach or routing area update procedure regardless the value of the ATT flag.

If a GPRS MS is operating in mode A or B in a network that operates in mode I the IMSI detach shall be performed by the GMM using the combined GPRS detach procedure

NOTE: A GPRS MS operating in mode A or B in a network that operates in mode I, shall perform the combined GPRS detach procedure regardless the value of the ATT flag.

A GPRS MS operating in mode A or B in network that operates in mode I, uses the combined GMM specific procedures in place of the MM specific procedures, so all conditions describing when to trigger a MM specific procedure listed in subsections 4.3 and 4.4 shall not apply.

A GPRS MS operating in mode A or B in a network that operates in mode I should not use any MM timers relating to MM specific procedures, (e.g T3210, T3211, T3212, T3213) except in some error and abnormal cases. If the MM timers are already running, the MS should not react on the expiration of the timers.

NOTE: Whenever GMM performs a combined GMM procedure, a GPRS MS enters the MM state MM LOCATION UPDATING PENDING in order to prevent the MM to perform a location update procedure.

If the authentication procedure is performed by MM and the authentication is rejected by the network (i.e upon receive of AUTHENTICATION REJECT), the MS shall in addition set the GPRS update status to GU3 ROAMING NOT ALLOWED and shall, if available, delete the P-TMSI, P-TMSI signature, RAI and GPRS ciphering key sequence number stored. The SIM shall be considered as invalid for GPRS and non-GPRS services until switching off or the SIM is removed. The MS shall abort any GMM procedure and shall enter state GMM-DEREGISTERED.


4.1.1.2.2 GPRS MS operating in mode A or B in a network that operates in mode II or III

If the network operates in mode II or III, a GPRS MSs that operate in mode A or B and wish to be or are simultaneously IMSI attached for GPRS and non-GPRS services, shall use the MM specific procedures listed in subsections 4.3 and 4.4 and the GMM specific procedures listed in subsections 4.7.3, 4.7.4 and 4.7.5. The applicability of periodic location updating is further specified in section 4.4.2 and the periodic routing area updating is specified in section 4.7.2.2.

If the authentication procedure is performed by MM and the authentication is rejected by the network (i.e upon receive of AUTHENTICATION REJECT), the MS shall in addition set the GPRS update status to GU3 ROAMING NOT ALLOWED and shall, if available, delete the P-TMSI, P-TMSI signature, RAI and GPRS ciphering key sequence number stored. The SIM shall be considered as invalid for GPRS and non-GPRS services until switching off or the SIM is removed. The MS shall abort any GMM procedure and shall enter state GMM-DEREGISTERED.



Extract 2

4.7.3.1 GPRS attach procedure for GPRS services


The GPRS attach procedure is a GMM procedure used by GPRS MSs to IMSI attach for GPRS services.

The attach type information element shall indicate “GPRS attach”.



4.7.3.2 Combined GPRS attach procedure for GPRS and non-GPRS services


The combined GPRS attach procedure is a GMM procedure used by a GPRS MS operating in MS operation modes A or B for IMSI attach for GPRS and non-GPRS services if the network operates in network operation mode I:.

If a GPRS MS operating in MS operation modes A or B is already attached for non-GPRS services by use of the MM specific IMSI attach procedure, but additionally wishes to perform an IMSI attach for GPRS services, the combined GPRS attach procedure shall also be used.

The attach type information element shall indicate “combined GPRS attach”. In this case, the messages ATTACH ACCEPT, ATTACH COMPLETE, and ATTACH REJECT used by the combined GPRS attach procedure carry information for both the GPRS and the non-GPRS services.

Extract 3

10.5.5.2 Attach type


The purpose of the attach type information element is to indicate the type of the requested attach, i.e. whether the MS wants to perform a GPRS or combined GPRS attach.

The attach type is a type 1 information element.

The attach type information element is coded as shown in figure 10.5.118/3GPP TS 04.08 and table 10.5.135/3GPP TS 04.08.





8 7 6 5 4 3 2 1







Attach type
IEI

0
spare

Type of attach

octet 1


Figure 10.5.118/3GPP TS 04.08: Attach type information element

Table 10.5.135/3GPP TS 04.08: Attach type information element

Type of attach (octet 1)

Bits

3 2 1


0 0 1 GPRS attach

0 1 0 GPRS attach while IMSI attached

0 1 1 Combined GPRS/IMSI attach
All other values are interpreted as GPRS attach in this version of the protocol.




Questions

From these extracts, the GPRS group has different interpretation of what attach type that shall be used in network mode I. We therefore kindly ask for the correct interpretation. In the case that the R97 specification allows different interpretations we also ask for guidance which Attach types that must be allowed in the conformance tests.


An example of an interpretation is in the following table :



Network conditions

Mobile State

(having just powered on)


Attach type

ATT=0

MS class A or B

MS that does not auto attach

MS in same LAI

(No IMSI attach performed and no Normal location update as ATT = 0)

GPRS attach requested by user

GPRS attach while IMSI attached



ATT=0

MS class A or B

MS that does not auto attach

MS in new LAI

(Normal location update already performed due to new LAI)

GPRS attach requested by user

GPRS attach while IMSI attached



ATT=1

MS class A or B

MS that does not auto attach

(LAI not relevant due to ATT flag)

(Normal location update already performed as ATT=1)

GPRS attach requested by user

GPRS attach while IMSI attached



ATT=0

MS class A or B

MS auto attaches to GPRS

MS in same LAI

(Normal location update not necessary)


Combined GPRS / IMSI attach



ATT=0

MS class A or B

MS auto attaches to GPRS

MS in new LAI

(Normal location update not possible due to combined GPRS procedures)


Combined GPRS / IMSI attach



ATT=1

MS class A or B

MS auto attaches to GPRS

MS in same or new LAI

(No IMSI attach performed and no Normal location update due to combined GPRS procedures)


Combined GPRS / IMSI attach



ATT=0 and 1

MS class C in GPRS mode

(IMSI attach not required)


GPRS attach




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