9.1 TMSI reallocation
34.123-13GPPPart 1: Protocol conformance specificationRelease 15TSUser Equipment (UE) conformance specification
The intention of the TMSI Reallocation procedure is to assign a new temporary identity for the UE. If the message is not understood by the UE, the network could not establish a link to the UE. As this is a common MM procedure, it can be initiated at any time.
9.1.1 Definition
9.1.2 Conformance requirement
1) A UE 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 USIM when the UE is correctly deactivated in accordance with the manufacturer’s instructions.
3) A UE shall answer paging with this TMSI and includes it in the PAGING RESPONSE message.
Reference(s)
TS 24.008 clause 4.3.1.
9.1.3 Test purpose
To verify that the UE is able to receive and acknowledge a new TMSI by means of an explicit TMSI reallocation procedure.
To verify that the UE has stored the TMSI in a non-volatile memory.
The implicit reallocation procedure is tested in clause 9.4.1.
9.1.4 Method of test
Initial conditions
– System Simulator:
– two cells A and B, belonging to different location areas a and b, default parameters.
- The SIB1 IE "CN domain specific NAS system information", for the CS Domain, is set to not allowing IMSI Attach/Detach in both the cells.
– User Equipment:
– the UE has valid TMSI (= TMSI1), CKSN, CK, IK. It is "idle updated" on cell B.
Related ICS/IXIT statement(s)
Switch off button Yes/No.
Way to bring the UE into service.
Test Procedure
The UE is paged in cell B and the security mode is established. An explicit TMSI reallocation procedure is performed. The RRC CONNECTION is released. The UE is switched off and then its power supply is interrupted for 10 s. The power supply is resumed and then the UE is switched on and allowed sufficient time to guarantee that the UE is in service (listening to its paging subchannel). The system simulator then checks, by paging, whether the UE has stored the received TMSI.
The UE 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 UE has stored the allocated TMSI.
Expected sequence
|
Step |
Direction |
Message |
Comments |
|
|---|---|---|---|---|
|
UE |
SS |
|||
|
The following messages are sent and shall be received on cell B. |
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|
1 |
|
Mobile terminated establishment of Radio Resource Connection |
See TS 34.108 clause 7.1.2 "Initial UE identity" = TMSI1. Establishment Cause: Terminating Conversation Call. |
|
|
2 |
|
PAGING RESPONSE |
"Mobile identity" =TMSI1 |
|
|
2a |
|
AUTHENTICATION REQUEST |
||
|
2b |
|
AUTHENTICATION RESPONSE |
||
|
3 |
SS |
The SS starts integrity protection. |
||
|
4 |
Void |
|||
|
5 |
|
TMSI REALLOCATION COMMAND |
"Mobile identity" = new TMSI (TMSI2) different from TMSI 1. |
|
|
6 |
|
TMSI REALLOCATION COMPLETE |
||
|
7 |
SS |
The SS releases the RRC connection. |
||
|
8 |
Void |
|||
|
9 |
UE |
If possible (see ICS), the UE is switched off. A Detach Request can be received in PS mode. |
||
|
9a |
UE |
The power supply is interrupted for 10 s. |
||
|
10 |
UE |
The UE is switched on. The subsequent GMM attach should be rejected if received in the PS mode. |
||
|
11 |
SS |
The SS waits for 5 seconds to guarantee that the UE is in service (listening to its paging subchannel). |
||
|
12 |
|
Mobile terminated establishment of Radio Resource Connection |
See TS 34.108 clause 7.1.2 "Initial UE identity" = TMSI2. Establishment Cause: Terminating Conversation Call. |
|
|
13 |
|
PAGING RESPONSE |
"Mobile identity" =TMSI2. |
|
|
14 |
SS |
The SS releases the RRC connection. The following messages are sent and shall be received on cell A |
||
|
15 |
Void |
|||
|
16 |
SS |
Set the cell type of cell A to the "Serving cell". Set the cell type of cell B to the "non-suitable cell" (see note) |
||
|
17 |
SS |
RRC CONNECTION REQUEST |
The SS verifies that the IE "Establishment cause" in the received RRC CONNECTION REQUEST message is set to "Registration". |
|
|
18 |
Void |
|||
|
19 |
Void |
|||
|
20 |
|
LOCATION UPDATING REQUEST |
location updating type = normal, "ciphering key sequence number" = CKSN, LAI = b, "mobile identity" = TMSI2. |
|
|
20a |
|
AUTHENTICATION REQUEST |
||
|
20b |
|
AUTHENTICATION RESPONSE |
||
|
20c |
SS |
The SS starts integrity protection. |
||
|
20d |
Void |
|||
|
21 |
|
TMSI REALLOCATION COMMAND |
TMSI = TMSI1. |
|
|
22 |
|
TMSI REALLOCATION COMPLETE |
||
|
23 |
|
LOCATION UPDATING ACCEPT |
This message does not contain the optional Mobile Identity field. |
|
|
24 |
SS |
The SS releases the RRC connection. |
||
|
25 |
Void |
|||
|
25a |
The SS waits for 5 seconds to allow the UE to become "idle updated" on cell A. |
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|
26 |
|
Mobile terminated establishment of Radio Resource Connection |
See TS 34.108 clause 7.1.2 "Initial UE identity" IE contains the new TMSI (= TMSI1). "Establishment cause": Terminating Conversational Call. |
|
|
27 |
|
PAGING RESPONSE |
"Mobile identity" IE contains the new TMSI (= TMSI1). |
|
|
28 |
SS |
The SS releases the RRC connection. |
||
|
29 |
Void |
|||
|
NOTE: The definitions for "Serving cell" and "non-suitable cell" are specified in TS 34.108 clause 6.1 "Reference Radio Conditions for signalling test cases only". |
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Specific message contents
None.
9.1.5 Test requirement
At step 5 the UE shall receive and acknowledge a new TMSI (TMSI2) and has stored that in the USIM, and the UE is switched off and on after step 9 and 10.
At step 13 the UE shall transmit a new TMSI2 and includes it in the PAGING RESPONSE message.
At step 27 the UE shall answer paging with this TMSI1 and includes it in the PAGING RESPONSE message.