26.8.2 Call Re-establishment

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

26.8.2.1 Call Re-establishment/call present, re-establishment allowed

26.8.2.1.1 Definition

This is to test a successful case of a call re-establishment procedure. This test is applicable for any equipment supporting at least one bearer capability. If the MS does not perform call re-establishment procedure correctly, the network will waste resources.

26.8.2.1.2 Conformance requirement

1) If the call is in the "active" state or "mobile originating modify" state, the indication from MM that re-establishment is possible shall cause call control to request re-establishment from the MM-connection, suspend any further message to be sent and await the completion of the re-establishment procedure.

2) When the call control entity is notified that the MM-connection is re-established, it shall then resume the transmission of possibly suspended messages and resume user data exchange when an appropriate channel is available.

References

1) 3GPP TS 04.08 / 3GPP TS 24.008, subclauses 4.5.1.6 and 5.5.4.2.

2) 3GPP TS 04.08 / 3GPP TS 24.008, subclauses 4.5.1.6 and 5.5.4.3.

26.8.2.1.3 Test purpose

The purpose of this test is to verify that the MS can correctly perform a call re-establishment procedure.

26.8.2.1.4 Method of test

Specific PICS statements

PIXIT statements

Initial conditions

System Simulator:

The SS simulates cells A and B. The LAC of cell A is different from the LAC of cell B. The PLMN identities of cell A and B are equal.

The call re-establishment parameter concerning cell A is set to an arbitrary value.

Cell B is not barred, the RACH control parameters information element sent in SYSTEM INFORMATION TYPE 1 to 4 messages of cell A and B specifies "call reestablishment allowed in the cell", the NCC of cell B is indicated as permitted in the PLMN permitted information element of SYSTEM INFORMATION TYPE 2 and 6 messages of cell A. Cell B is indicated as a neighbour cell of cell A in SYSTEM INFORMATION TYPE 2 and 5 messages of cell A. Cell reselect hysteresis parameter of cell A is set to zero.

Mobile Station:

The MS is in MM-state "idle, updated" with valid TMSI and CKSN on cell A.

Foreseen final state of the MS

The MS is in MM-state "idle, updated" with valid TMSI and CKSN.

Maximum duration of test

1 minute.

Test procedure

The MS is brought to active state by using procedure 26.9.2, "structured procedures, MS originated call, early assignment". The RF level of cell A is lowered so that cell B is to be selected (when the MS performs re-establishment after radio link failure), while keeping the C1 and C2 of cell A greater than zero. SS waits for at least 5 s. Then the SS stops transmission on the TCH/SACCH. The MS shall re-establish the call on cell B using a CM RE-ESTABLISHMENT message. The SS performs ciphering mode setting and assignment procedures. The MS shall through-connect the appropriate bearer channel. Then, the call is cleared by the SS.

Expected sequence

Step

Direction

Message

Comments

1

Steps 1‑19 of test case 26.9.2 are performed (the appropriate bearer channel is through connected in both directions in TCH)

2

SS

The RF level of cell A is lowered. The SS waits at least 5 s. The SS stops transmission on the TCH/SACCH.

3

MS -> SS

CHANNEL REQUEST

this is sent on cell B. Establ. cause shall be "call re-establishment; TCH/F was in use,…"

4

SS -> MS

IMMEDIATE ASSIGNMENT

5

MS -> SS

CM REESTABLISHMENT REQUEST

note specific message contents

6

SS -> MS

CIPHERING MODE COMMAND

SS starts deciphering after sending the message.

7

MS -> SS

CIPHERING MODE COMPLETE

Shall be sent enciphered. All following messages shall be sent enciphered.

8

SS

SS starts ciphering.

9

SS -> MS

ASSIGNMENT COMMAND

10

MS -> SS

ASSIGNMENT COMPLETE

11

MS

The appropriate bearer channel is through connected in both directions.

12

SS -> MS

DISCONNECT

with cause value "Normal"

13

MS -> SS

RELEASE

14

SS -> MS

RELEASE COMPLETE

15

SS -> MS

CHANNEL RELEASE

The main signalling link is released.

Specific message contents:

CM RE-ESTABLISHMENT REQUEST

Information element

Value/remark

Protocol discriminator

Mobility Management

Skip indicator

Encoded as zeroes

Message type

CM RE-ESTABLISHMENT REQUEST

Ciphering key sequence number

The CKSN which the MS was allocated in step 6 of the procedure of subclause 26.9.2.

Spare half octet

zero

Mobile station classmark 2

– ES_IND

as declared in the PICS/PIXIT

– RF Power capability

as declared in the PICS/PIXIT for band of operation

– Ciphering A5/1

as declared in the PICS/PIXIT

Mobile identity

The TMSI that the MS is having initially

Location area identification

Corresponding the LAI of cell A

26.8.2.2 Call Re-establishment/call present, re-establishment not allowed

26.8.2.2.1 Definition

This is to test a special case of a call re-establishment, in which it is not allowed for a MS to attempt re-establishment of a call. This test is applicable for any equipment supporting at least one mobile originated circuit switched basic service.

26.8.2.2.2 Conformance requirement

When a lower layer failure occurs while an MM-connection is active, if a cell allowing call re-establishment is not available, the MS shall release the MM-connection and shall not attempt call re-establishment.

References

3GPP TS 04.08 / 3GPP TS 24.008, subclauses 4.5.1.6 and 5.5.4.

26.8.2.2.3 Test purpose

The purpose of this test is to verify that the MS does not attempt call re-establishment when it is not allowed to take place because of the unavailability of a cell allowing call re-establishment.

26.8.2.2.4 Method of test

Specific PICS statements

PIXIT statements

Initial conditions

System Simulator:

The SS simulates cell A.

Cell A is not barred, the NCC of cell A is indicated as permitted in the PLMN permitted information element of SYSTEM INFORMATION TYPE 2 and 6 messages. The RE field of the RACH control parameters information element broadcast in messages SYSTEM INFORMATION TYPE 1, 2, 3 and 4 of cell A are set to "call reestablishment not allowed in the cell".

Mobile Station:

The MS is in MM-state "idle, updated" with valid TMSI and CKSN.

Foreseen final state of the MS

The MS is in MM-state "idle, updated" with valid TMSI and CKSN.

Maximum duration of test

1 minute.

Test procedure

The MS is brought to active state by using procedure 26.9.2, "structured procedures, MS originated call, early assignment". The SS stops transmission on the TCH/SACCH. The MS shall not require re-establishment of the call.

Expected sequence

Step

Direction

Message

Comments

1

Steps 1‑19 of test case 26.9.2 are performed (the appropriate bearer channel is through connected in both directions in TCH)

2

SS

the SS stops transmission on the TCH/SACCH

3

MS

the MS shall not attempt re-establishment on cell A. This is checked for 30 s after the radio link failure.

Specific message contents:

None.

26.8.2.3 Call Re-establishment/call under establishment, transmission stopped

26.8.2.3.1 Definition

This is to test a special case of a call re-establishment, in which it is not allowed for a MS to attempt re-establishment of a call, since the call has not been established yet. This test is applicable for any equipment supporting at least one mobile originated circuit switched basic service.

26.8.2.3.2 Conformance requirement

When a lower layer failure occurs while an MM-connection is active, if the state of the call control entity is not "active", the MS shall release the MM-connection and shall not attempt call re-establishment.

References

3GPP TS 04.08 / 3GPP TS 24.008, subclauses 4.5.1.6 and 5.5.4.2.

26.8.2.3.3 Test purpose

The purpose of this test is to verify that the MS does not attempt call re-establishment when it is not allowed to take place because of the call control state.

26.8.2.3.4 Method of test

Specific PICS statements

PIXIT statements

Initial conditions

System Simulator:

The SS simulates cell A.

Cell A is not barred, the RACH control parameters information element sent in SYSTEM INFORMATION TYPE 1 to 4 messages of cell A specifies "call reestablishment allowed in the cell", the NCC of cell A is indicated as permitted in the PLMN permitted information element of SYSTEM INFORMATION TYPE 2 and 6 messages.

Mobile Station:

The MS is in MM-state "idle, updated" with valid TMSI and CKSN.

Foreseen final state of the MS

The MS is in MM-state "idle, updated" with valid TMSI and CKSN.

Maximum duration of test

1 minute.

Test procedure

The call control entity of the MS is brought to state U4, "call delivered" by using initial part of procedure 26.9.2, "structured procedures, MS originated call, early assignment". The SS stops transmission on the TCH/SACCH. The MS shall not require re-establishment of the call on cell A.

Expected sequence

Step

Direction

Message

Comments

1

the MS is made to initiate a call

2

MS -> SS

CHANNEL REQUEST

3

SS -> MS

IMMEDIATE ASSIGNMENT

4

MS -> SS

CM SERVICE REQUEST

5

SS -> MS

AUTHENTICATION REQUEST

6

MS -> SS

AUTHENTICATION RESPONSE

7

SS -> MS

CIPHERING MODE COMMAND

SS starts deciphering after sending the message.

8

MS -> SS

CIPHERING MODE COMPLETE

All following messages shall be sent enciphered.

9

SS

SS starts ciphering.

10

MS -> SS

SETUP

11

SS -> MS

CALL PROCEEDING

12

SS -> MS

ASSIGNMENT COMMAND

13

MS -> SS

ASSIGNMENT COMPLETE

14

SS -> MS

ALERTING

15

SS

the SS stops transmission on the TCH/SACCH

16

MS

the MS shall not attempt re-establishment on cell A. This is checked for 30 s after the radio link failure.

Specific message contents:

None.