44.2.8 DTM mobility management

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

44.2.8.1 Change of cell between two LAs in idle mode

44.2.8.1.1 Change of cell between two LAs in idle mode / RAU completes first

44.2.8.1.1.1 Conformance requirements

RA update and LA update procedures shall be supported in parallel in the main DCCH with SAPI 0. This helps reduce the congestion caused by GPRS signalling on GPRS TCHs that naturally exists in cells on the border of a RA or RA/LA without noticeably affecting the QoS of the CS connection.

In network mode of operation II and III, whenever a Class-A MS determines that it shall perform both a LA update and an RA update it shall initiate the LA update and then initiate the RA update.

A MS supporting the «GPRS» option whose CHANNEL REQUEST message contained a packet access establishment cause shall obey an IMMEDIATE ASSIGNMENT message to a channel which is to be used in dedicated mode.

References

3GPP TS 03.55/43.055, sub-clause 6.4.1

3GPP TS 23.060, sub-clause 6.9.1

3GPP TS 04.18/44.018, sub-clause 3.3.1.3

44.2.8.1.1.2 Test purpose

To verify that both Location Updating and Routeing Area Updating procedures are completed in parallel and also to guarantee that the GPRS mobile obeys a command to use the SDCCH for signalling.

44.2.8.1.1.3 Method of test

Initial Conditions

System Simulator:

2 cells, A and B with different LAIs, both operating in network operation mode II and both support DTM.

Mobile Station:

The MS is in packet idle mode with a TMSI and P-TMSI allocated.

Specific PICS statements:

PIXIT statements:

Test Procedure

Once the MS is camped on cell A in the first LA, the SS commences the test by lowering the RF level of cell A below that of cell B prompting the MS to complete cell reselection. Once cell B has been selected by the MS, the MS initiates the Location Updating and Routing Area Updating procedures. The SS responds to the ROUTING AREA UPDATE REQUEST message with a ROUTING AREA UPDATE ACCEPT message and then completes the Location Updating procedure by replying with a LOCATION UPDATING ACCEPT message to the LOCATION UPDATING REQUEST sent by the MS. The SS then releases the RR connection.

Maximum Duration of Test

5 minutes

Expected Sequence

Step

Direction

Message

Comments

1

SS

The RF level of cell A is lowered until the MS selects cell B.

2

MS->SS

CHANNEL REQUEST

"Establishment cause": Location updating.

3

SS->MS

IMMEDIATE ASSIGNMENT

Allocates an SDCCH to the MS.

4

MS->SS

LOCATION UPDATING REQUEST

SS verifies that all signalling sent on the main DCCH is transmitted on the allocated SDCCH.

5

MS->SS

GPRS INFORMATION

Contains the ROUTING AREA UPDATE REQUEST message. SS verifies that all signalling sent on the main DCCH is transmitted on the allocated SDCCH

6

SS->MS

GPRS INFORMATION

Contains the ROUTING AREA UPDATE ACCEPT message

7

SS->MS

LOCATION UPDATING ACCEPT

8

SS->MS

CHANNEL RELEASE

44.2.8.1.2 Change of cell between two LAs in idle mode / LAU completes first / SS releases channel

Conformance requirements

RA update and LA update procedures shall be supported in parallel in the main DCCH with SAPI 0. This helps reduce the congestion caused by GPRS signalling on GPRS TCHs that naturally exists in cells on the border of a RA or RA/LA without noticeably affecting the QoS of the CS connection.

In network mode of operation II and III, whenever a Class-A MS determines that it shall perform both a LA update and an RA update it shall initiate the LA update and then initiate the RA update.

References

3GPP TS 03.55/43.055, sub-clause 6.4.1

3GPP TS 23.060 sub-clause 6.9.1

44.2.8.1.2.2 Test purpose

To verify that:

  • both Location Updating and Routing Area Updating procedures are completed in parallel.
  • the MS can complete the Routing Area Updating procedure on TBFs when the channel is removed.
  • the GPRS mobile obeys a command to use a TCH/F for signalling.

44.2.8.1.2.3 Method of test

Initial Conditions

System Simulator:

2 cells, A and B with different LAIs, both operating in network operation mode II and both support DTM.

Mobile Station:

The MS is in "idle" state with a TMSI and P-TMSI allocated.

Specific PICS statements:

PIXIT statements:

Test Procedure

Once the MS is camped on cell A in the first LA, the SS commences the test by lowering the RF level of cell A below that of cell B prompting the MS to complete cell reselection. Cell B is selected by the MS and then initiates Location Updating and Routing Area Updating procedures. The SS completes the Location Updating Procedure by responding to the LOCATION UPDATING REQUEST message with a LOCATION UPDATING ACCEPT message. The SS then releases the RR connection. After the RR connection has been released, the SS establishes a downlink TBF, and transmits a ROUTING AREA UPDATE ACCEPT message reallocating the P-TMSI of the MS. The MS initiates the establishment of an uplink TBF, to complete the Routing Area Updating procedure by sending a ROUTING AREA UPDATE COMPLETE message and accepts the new P-TMSI.

Maximum Duration of Test

5 minutes

Expected Sequence

Step

Direction

Message

Comments

1

SS

The RF level of cell A is lowered until the MS selects cell B.

2

MS->SS

CHANNEL REQUEST

"Establishment cause": Location updating.

3

SS->MS

IMMEDIATE ASSIGNMENT

Allocates a TCH/F to the MS.

4

MS->SS

LOCATION UPDATING REQUEST

SS verifies that all signalling sent on the main DCCH is transmitted on the allocated TCH.

5

MS->SS

GPRS INFORMATION

Contains the ROUTING AREA UPDATE REQUEST message. SS verifies that all signalling sent on the main DCCH is transmitted on the allocated TCH.

6

SS->MS

LOCATION UPDATING ACCEPT

7

SS->MS

CHANNEL RELEASE

8

A downlink TBF is then established to allow the RAU ACCEPT message to be returned to the MS.

9

SS->MS

ROUTING AREA UPDATE ACCEPT

Allocates a new P-TMSI.

See specific message contents.

10

An uplink TBF is then established to allow the RAU COMPLETE message to be returned by the MS.

11

MS->SS

ROUTING AREA UPDATE COMPLETE

Specific message contents

ROUTING AREA UPDATE ACCEPT (Step 9):

Information Element

Value/remark

As default message contents except:

– Allocated P-TMSI

– Type of Identity

P-TMSI

– P-TMSI value

12345678 (Hex)

44.2.8.1.3 Change of cell between two LAs in idle mode / LAU completes first / SS maintains channel

44.2.8.1.3.1 Conformance requirements

RA update and LA update procedures shall be supported in parallel in the main DCCH with SAPI 0. This helps reduce the congestion caused by GPRS signalling on GPRS TCHs that naturally exists in cells on the border of a RA or RA/LA without noticeably affecting the QoS of the CS connection.

In network mode of operation II and III, whenever a Class-A MS determines that it shall perform both a LA update and an RA update it shall initiate the LA update and then initiate the RA update.

References

3GPP TS 03.55/43.055, sub-clause 6.4.1

3GPP TS 23.060, sub-clause 6.5.1

44.2.8.1.3.2 Test purpose

To guarantee that the MS can complete the Routing Area Updating procedure on the main DCCH, if the network maintains the CS connection after the Location Updating procedure is completed.

44.2.8.1.3.3 Method of test

Initial Conditions

System Simulator:

2 cells, A and B with different LAIs, both operating in network operation mode II and both support DTM.

Mobile Station:

The MS is in "idle" state with a TMSI and P-TMSI allocated.

Specific PICS statements:

PIXIT statements:

Test Procedure

Once the MS is camped on cell A in the first LA, the SS commences the test by lowering the RF level of cell A below that of cell B prompting the MS to complete cell reselection. Cell B is selected by the MS and then initiates Location Updating and Routing Area Updating procedures. The SS completes the Location Updating Procedure by responding to the LOCATION UPDATING REQUEST message with a LOCATION UPDATING ACCEPT message. The SS then waits 5 seconds before continuing the test. The SS then transmits a ROUTING AREA UPDATE ACCEPT message reallocating the P-TMSI of the MS. The MS completes the Routing Area Updating procedure by transmitting a ROUTING AREA UPDATE COMPLETE message on the main DCCH, accepting the new P-TMSI.

Maximum Duration of Test

5 minutes

Expected Sequence

Step

Direction

Message

Comments

1

SS

The RF level of cell A is lowered until the MS selects cell B.

2

MS->SS

CHANNEL REQUEST

"Establishment cause": Location updating.

3

SS->MS

IMMEDIATE ASSIGNMENT

4

MS->SS

LOCATION UPDATING REQUEST

5

MS->SS

GPRS INFORMATION

Contains the ROUTING AREA UPDATE REQUEST message.

6

SS->MS

LOCATION UPDATING ACCEPT

7

The SS waits 5 seconds, maintaining the main DCCH.

8

SS->MS

GPRS INFORMATION

Contains the ROUTING AREA UPDATE ACCEPT message, reallocating the MSs P-TMSI.

See specific message contents.

9

MS->SS

GPRS INFORMATION

Contains the ROUTING AREA UPDATE COMPLETE message.

10

SS->MS

CHANNEL RELEASE

Specific message contents

ROUTING AREA UPDATE ACCEPT (Step 8):

Information Element

Value/remark

As default message contents except:

– Allocated P-TMSI

– Type of Identity

P-TMSI

– P-TMSI value

C2345678 (Hex)

44.2.8.2 Void