26.7.1 TMSI reallocation

3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS

The intention of the TMSI Reallocation procedure is to assign a new temporary identity for the MS. If the message is not understood by the MS, the network could not establish a link to the MS. As this is a common MM procedure, it can be initiated at any time.

26.7.1.1 Conformance requirement

1) A Mobile Station shall acknowledge a new TMSI when explicitly allocated during a location updating procedure or an incoming call.

2) The TMSI shall be updated on the SIM when the Mobile Station is correctly deactivated in accordance with the manufacturer’s instructions.

3) A Mobile Station shall answer paging with this TMSI and includes it in the Paging Response message.

Reference(s):

3GPP TS 04.08 / 3GPP TS 24.008 subclause 4.3.1, 3GPP TS 03.03 clause 2, 3GPP TS 02.17 subclause 6.1.

26.7.1.2 Test purpose

To verify that the MS is able to receive and acknowledge a new TMSI by means of an explicit TMSI reallocation procedure.

To verify that the MS has stored the TMSI in a non-volatile memory.

The implicit reallocation procedure is tested in subclause 26.7.4.1.

26.7.1.3 Method of test

Initial conditions

System Simulator:

Two cells A and B, belonging to different location areas a and b, default parameters.

Mobile Station:

The MS has valid TMSI (= TMSI1), CKSN, Kc. It is "idle updated" on cell B.

Specific PICS statements:

– On/Off switch (TSPC_Feat_OnOff)

PIXIT statements:

Foreseen final state of the MS

The MS has a valid TMSI (= TMSI1), CKSN, Kc. It is "idle updated" on cell A.

Test Procedure

The MS is paged in cell B and the ciphering mode is established. An explicit TMSI reallocation procedure is performed. The channel is released. The MS is switched off and then its power supply is interrupted for 10 s. The power supply is resumed and then the MS is switched on and allowed sufficient time to guarantee that the MS is in service (listening to its paging subchannel). The system simulator then checks, by paging, whether the MS has stored the received TMSI.

The MS is made to select cell A. A normal location updating procedure is performed in cell A. An explicit TMSI reallocation procedure is performed and then the location updating procedure is accepted by the SS. The system simulator checks, by paging, whether the MS has stored the allocated TMSI.

Maximum duration of test

2 minutes.

Expected sequence

Step

Direction

Message

Comments

The following messages are sent and shall be received on cell B.

1

SS -> MS

PAGING REQUEST TYPE 1

"Mobile identity" = TMSI1.

2

MS -> SS

CHANNEL REQUEST

Establishment Cause: Answer to paging.

3

SS -> MS

IMMEDIATE ASSIGNMENT

4

MS -> SS

PAGING RESPONSE

5

SS -> MS

CIPHERING MODE COMMAND

The SS starts deciphering.

6

MS -> SS

CIPHERING MODE COMPLETE

The SS starts enciphering.

7

SS -> MS

TMSI REALLOCATION COMMAND

"Mobile identity" = new TMSI (TMSI2) different from TMSI 1.

8

MS -> SS

TMSI REALLOCATION COMPLETE

9

SS -> MS

CHANNEL RELEASE

After the sending of this message, the SS waits for the disconnection of the main signalling link.

10

MS

If possible (see PICS), the MS is switched off.

10a

MS

The power supply is interrupted for 10 s.

11

MS

The MS is switched on.

12

SS

The SS waits an amount of time which is enough to guarantee that the MS is in service (listening to its paging subchannel).

13

SS -> MS

PAGING REQUEST TYPE 1

"Mobile identity" = TMSI2.

14

MS -> SS

CHANNEL REQUEST

Establishment Cause: Answer to paging.

15

SS -> MS

IMMEDIATE ASSIGNMENT

16

MS -> SS

PAGING RESPONSE

"Mobile identity" =TMSI2.

17

SS -> MS

CHANNEL RELEASE

After the sending of this message, the SS waits for the disconnection of the main signalling link. The following messages are sent and shall be received on cell A

18

SS

The RF level of cell B is lowered until the MS selects cell A. The RF level of cell B is set sufficiently low to ensure that cell B is not suitable as defined in 3GPP TS 05.08 subclause 6.6.2.

19

MS -> SS

CHANNEL REQUEST

Establishment cause: Location updating.

20

SS -> MS

IMMEDIATE ASSIGNMENT

21

MS -> SS

LOCATION UPDATING REQUEST

location updating type = normal, "ciphering key sequence number" = CKSN, LAI = b, "mobile identity" = TMSI2.

22

SS -> MS

TMSI REALLOCATION COMMAND

TMSI = TMSI1.

23

MS -> SS

TMSI REALLOCATION COMPLETE

24

SS -> MS

LOCATION UPDATING ACCEPT

This message does not contain the optional Mobile Identity field.

25

SS -> MS

CHANNEL RELEASE

After the sending of this message, the SS waits for the disconnection of the main signalling link. The SS waits an amount of time which is enough to guarantee that the MS is "idle updated" on cell A.

26

SS -> MS

PAGING REQUEST TYPE 1

"Mobile identity" IE contains the new TMSI (= TMSI1).

27

MS -> SS

CHANNEL REQUEST

"Establishment cause": Answer to paging.

28

SS -> MS

IMMEDIATE ASSIGNMENT

29

MS -> SS

PAGING RESPONSE

"Mobile identity" IE contains the new TMSI (= TMSI1).

30

SS -> MS

CHANNEL RELEASE

After the sending of this message, the SS waits for the disconnection of the main signalling link.

Specific message contents:

None.