44.2.11 Cell Notification

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

44.2.11.1 Conformance Requirement

When the READY timer is running or has been deactivated the MS shall perform cell update each time a new cell is selected.

When the READY timer has expired the MS shall:

– perform the routing area updating procedure when a routing area border is crossed;

– not perform a cell update when a new cell is selected.

The READY timer is started:

– in the MS when the GMM entity receives an indication from lower layers that an LLC frame other than LLC NULL frame has been transmitted on the radio interface; and

– in the network when the GMM entity receives an indication from lower layers that an LLC frame other than LLC NULL frame has been successfully received by the network.

If a new READY timer value is negotiated, the MS shall upon the reception of the ATTACH ACCEPT or ROUTING AREA UPDATE ACCEPT message perform a initial cell update (either by transmitting a LLC frame or, if required, a ATTACH COMPLETE or ROUTING AREA UPDATE COMPLETE message), in order to apply the new READY timer value immediately. If both the network and the MS supports the Cell Notification, the initial cell update shall use any LLC frame except the LLC NULL frame.

In A/Gb mode, if the ATTACH ACCEPT message contains the Cell Notification information element, then the MS shall start to use the LLC NULL frame to perform cell updates.

In A/Gb mode, if the ROUTING AREA UPDATE ACCEPT message contains the Cell Notification information element, then the MS shall start to use the LLC NULL frame to perform cell updates.

44.2.11.2 Test Purpose

Test purpose 1

The MS shall start to use the LLC NULL frame to perform cell updates following receipt of an ATTACH ACCEPT message containing the Cell Notification information element.

Test purpose 2

The MS shall start to use the LLC NULL frame to perform cell updates following receipt of a ROUTING AREA UPDATE ACCEPT message containing the Cell Notification information element.

Reference(s):

3GPP TS 04.08 / 3GPP TS 24.008 subclauses 4.7.2.1.1, 4.7.3.1.3, 4.7.5.1.3

44.2.11.3 Method of Test

44.2.11.3.1 Test Procedure 1 – Ready Timer Behaviour

Initial Conditions

System Simulator:

Two cells (not simultaneously activated), Cell A in MCC1/MNC1/LAC1/RAC1, Cell B in MCC1/MNC1/LAC1/RAC1.

Both cells are operating in network operation mode II.

Mobile Station:

The MS has a valid IMSI. MS is switched off.

Specific PICS statements:

– MS operation mode B (TSPC_operation_mode_B).

– MS operation mode C (TSPC_operation_mode_C) (only if mode B not supported).

– Switch off on button (TSPC_Feat_OnOff).

– Automatic GPRS attach procedure at switch on or power on (TSPC_AddInfo_on_auto_GPRS_AP).

PIXIT statements:

Test Procedure

The MS switches on and performs GPRS ATTACH on Cell A. Cell Notification is indicated in the ATTACH ACCEPT message. The MS is made to re-select to Cell B whilst the READY timer is still running. The MS performs Cell Update / Cell Notification on Cell B by sending an LLC NULL frame. The SS then waits for the READY TIMER to expire. The MS is made to re-select to Cell A. It is checked that the MS does not perform Cell Update / Cell Notification. The MS is paged to confirm the cell-reselection to Cell A.

NOTE: the READY timer is not reset following the cell update from Cell A to Cell B but is runs uninterrupted since being started following transmission of the ATTACH COMPLETE message in the initial Cell Update – during the GPRS ATTACH Procedure on Cell A. The value of the ready timer is chosen such that if the MS were to have erroneously re-set the READY timer following the Cell Update from Cell A to Cell B it would perform a Cell Update when returning to Cell B from Cell A.

Maximum Duration of Test

10 minutes.

Expected Sequence

Step

Direction

Message

Comments

The following messages are sent and shall be received on Cell A.

1

SS

The SS activates Cell A.

2

MS

The MS is set in MS operation mode B (see PICS). If MS operation mode B not supported set the MS in operation mode C.

The MS is powered up or switched on and initiates an attach (see PICS).

3

MS -> SS

ATTACH REQUEST

Attach type = ‘GPRS attach’

4

SS -> MS

ATTACH ACCEPT

Attach result = ‘GPRS only attached’

Mobile identity = P-TMSI-2

P-TMSI-2 signature

Routing area identity = RAI-1

T3314 = 3 mins

Cell Notification IE = Present

5

MS -> SS

ATTACH COMPLETE

6

SS

The SS waits for 1.5 mins.

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

7

SS

Activate Cell B with a lower signal strength than Cell A The RF level of Cell A is lowered until Cell B is preferred by the MS.

8

MS -> SS

UPLINK RLC DATA BLOCK

Contains the LLC NULL frame. Received within T3314 of Step 5.

9

SS

The SS waits for 1.5 minutes for the READY timer to expire.

The following messages are sent and shall be received on Cell A.

10

SS

The RF level of cell A is increased until cell A is preferred by the MS.

11

SS

The SS checks that no LLC frame is received on Cell A for a period equivalent to T3314 following Step 8.

12

SS -> MS

PAGING REQUEST TYPE 1

Mobile identity = P-TMSI-2

Paging order is for TBF establishment.

13

MS -> SS

UPLINK RLC DATA BLOCK

LLC PDU implicitly indicating paging response.

Specific Message Contents

None.

44.2.11.3.2 Test Procedure 2 – Use of LLC NULL Frame

Initial Conditions

System Simulator:

Three cells (not simultaneously activated), Cell A in MCC1/MNC1/LAC1/RAC1, Cell B in MCC1/MNC1/LAC1/RAC2 and Cell C in MCC1/MNC1/LAC1/RAC2.

All cells are operating in network operation mode II.

Mobile Station:

The MS has a valid IMSI and P-TMSI-1 stored. MS is switched off.

Specific PICS statements:

– MS operation mode C (TSPC_operation_mode_C).

– MS operation mode B (TSPC_operation_mode_B) (only if mode C not supported).

– Switch off on button (TSPC_Feat_OnOff).

– Automatic GPRS attach procedure at switch on or power on (TSPC_AddInfo_on_auto_GPRS_AP).

PIXIT statements:

Test Procedure

The MS switches on and performs GPRS ATTACH on Cell A. In the ATTACH ACCEPT message the SS assigns a new (non-default) value for the READY timer but does not assign a new P-TMSI. Cell Notification is indicated in the ATTACH ACCEPT message. The MS performs an initial Cell Update by sending an LLC frame. It is checked that the MS does not send the LLC NULL frame. The MS is made to re-select to Cell B. The MS sends a ROUTING AREA UPDATE REQUEST. The SS sends a ROUTING AREA UPDATE ACCEPT message assigning a new value for the Ready timer but does not assign a new P-TMSI. Cell Notification is indicated in the ROUTING AREA UPDATE ACCEPT message. The MS performs an initial Cell Update by sending an LLC frame. It is checked that the MS does not send the LLC NULL frame. Before the Ready timer expires, the MS is made to re-select to Cell C. The MS performs Cell Update / Cell Notification by sending an LLC NULL frame.

NOTE: The SS does not assign a new value of P-TMSI in either the ATTACH ACCEPT or ROUTING AREA UPDATE ACCEPT messages to prevent the sending of ATTACH COMPLETE and ROUTING AREA UPDATE COMPLETE messages by the MS which would obscure possible erroneous use of the LLC NULL frame for the initial cell update by the MS.

Maximum Duration of Test

5 minutes.

Expected Sequence

Step

Direction

Message

Comments

The following messages are sent and shall be received on Cell A.

1

SS

The SS activates Cell A.

2

MS

The MS is set in MS operation mode C (see PICS). If MS operation mode C not supported set the MS in operation mode B.

The MS is powered up or switched on and initiates an attach (see PICS).

3

MS -> SS

ATTACH REQUEST

Attach type = ‘GPRS attach’

Mobile identity = P-TMSI-1

4

SS -> MS

ATTACH ACCEPT

Attach result = ‘GPRS only attached’

Routing area identity = RAI-1

T3314 = 3 mins

Allocated P-TMSI = Not Included

Cell Notification IE = Present

5

MS -> SS

UPLINK RLC DATA BLOCK

LLC PDU for initial cell update. Must not contain the LLC NULL frame.

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

6

SS

Activate Cell B with a lower signal strength than Cell A The RF level of Cell A is lowered until Cell B is preferred by the MS.

7

MS -> SS

ROUTING AREA UPDATING REQUEST

Update type = ‘RA updating’

Routing area identity = RAI-1

8

SS -> MS

ROUTING AREA UPDATING ACCEPT

Update result = ‘RA updated’

Routing area identity = RAI-4

T3314 = 4 mins

Allocated P-TMSI = Not Included

Cell Notification IE = Present

9

MS -> SS

UPLINK RLC DATA BLOCK

LLC PDU for initial cell update. Must not contain the LLC NULL frame.

The following messages are sent and shall be received on Cell C.

10

SS

Activate Cell C with a lower signal strength than Cell B. The RF level of Cell B is lowered until Cell C is preferred by the MS.

11

MS -> SS

UPLINK RLC DATA BLOCK

Contains the LLC NULL frame. Received within T3314 of Step 9.

Specific Message Contents

None.