26.6.1 Immediate assignment

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

The immediate assignment procedure is used by the network to establish a dedicated control channel for the MS and network to communicate the detail of the service requested. If the Mobile Station does not implement the procedure correctly, radio resources can be wasted as the Mobile Station might use the wrong channels.

26.6.1.1 Immediate assignment / SDCCH or TCH assignment

26.6.1.1.1 Conformance requirement

1. Following a PAGING REQUEST message, the MS shall correctly set up an RR connection on the SDCCH/8 described in the IMMEDIATE ASSIGNMENT message.

2. Following a PAGING REQUEST message, the MS shall correctly set up an RR connection on the TCH/FACCH described in the IMMEDIATE ASSIGNMENT message.

Reference(s)

3GPP TS 04.08 / 3GPP TS 44.018, subclause 3.3.1.1.2.

26.6.1.1.2 Test purpose

To verify that the MS can correctly set up a dedicated SDCCH control channel and that the MS can correctly set up a dedicated TCH/FACCH control channel.

26.6.1.1.3 Method of test

Initial Conditions

System Simulator:

1 cell, except that CCCH_CONF is set to "1 basic physical channel used for CCCH not combined with SDCCHs".

Mobile Station:

The MS is in the "idle, updated" state, with a TMSI allocated.

Specific PICS statements

– MS supports SDCCH only (TSPC_AddInfo_SDCCHOnly)

– MS supports GSM HR (TSPC_AddInfo_HalfRate)

PIXIT statements

Foreseen Final State of the MS

"Idle, updated", with TMSI allocated.

Test Procedure

The System Simulator pages the MS and after the MS has responded with a CHANNEL REQUEST message the SS assigns an SDCCH. The MS shall go to the correct channel and send a PAGING RESPONSE message. Then the SS initiates RR-release by sending a CHANNEL RELEASE message.

If TCH/F is supported by the MS, the test is repeated with the SS assigning a TCH/F (Signalling).

If TCH/H is supported by the MS, the test is repeated with the SS assigning a TCH/H (Signalling).

Maximum Duration of Test

6 s per value of the execution timer.

Expected Sequence

This sequence is performed for execution counter, K = 1, 2, 3 (unless the TCH is not supported).

Step

Direction

Message

Comments

1

SS -> MS

PAGING REQUEST TYPE 1

2

MS -> SS

CHANNEL REQUEST

3

SS -> MS

IMMEDIATE ASSIGNMENT

Channel Type: see below

4

MS -> SS

PAGING RESPONSE

Shall be sent on the correct channel

5

SS -> MS

CHANNEL RELEASE

Specific Message Contents

IMMEDIATE ASSIGNMENT

K=1, SDCCH test: Channel Type = SDCCH/8.

K=2, TCH/F (Signalling) test: Channel Type = Bm + ACCHs.

K=3, TCH/H (Signalling) test: Channel Type = Lm + ACCHs, subchannel arbitrarily chosen.

26.6.1.2 Immediate assignment / extended assignment

NOTE 2: In these tests the SS must send the immediate assignment messages in due time to allow for the MS to receive them and send a PAGING RESPONSE rather than another random access. This applies to the whole of clause 26.

26.6.1.2.1 Conformance requirements

1. The MS shall go to the allocated SDCCH/4 and send a PAGING RESPONSE message containing its identity and its classmark.

2. The MS shall go to the allocated SDCCH/8 and send a PAGING RESPONSE message containing its identity and its classmark.

3. The MS shall correctly identify its own assignment in either the Request Reference 1 or the Request Reference 2 information element in an extended assignment message.

4. The MS shall only react to an Immediate Assignment which references one of the last 3 CHANNEL REQUEST messages from the MS.

References

3GPP TS 04.08 / 3GPP TS 44.018, subclause 3.3.

26.6.1.2.2 Test purpose

To verify that the MS goes to the allocated SDCCH/4 and sends a PAGING RESPONSE message containing its identity and its classmark.

To verify that the MS goes to the allocated SDCCH/8 and sends a PAGING RESPONSE message containing its identity and its classmark.

To verify that the MS can correctly identify its own assignment in either the Request Reference 1 or the Request Reference 2 information element in an extended assignment message.

To verify that the MS only reacts to an Immediate Assignment which references one of the last 3 CHANNEL REQUEST messages from the MS.

26.6.1.2.3 Method of test

Initial Conditions

System Simulator:

1 cell, Max-retrans is set to 7.

Mobile Station:

The MS is in the "idle, updated" state. with a TMSI allocated.

Specific PICS statements

PIXIT statements

Foreseen Final State of the MS

"Idle, updated", with a TMSI allocated.

Test Procedure

In the first part of the test, the SS pages the MS, which shall react by sending CHANNEL REQUEST messages. Immediately after reception of the n-th CHANNEL REQUEST message (n being arbitrarily chosen by the SS from the set {1, 2 … 8}) the SS sends an IMMEDIATE ASSIGNMENT EXTENDED message, which references one of the last 3 CHANNEL REQUEST messages from the MS. The MS shall then go to the correct channel and send a PAGING RESPONSE message. The SS will then release the channel.

In the second part of the test, the SS again pages the MS, which shall react by sending CHANNEL REQUEST messages. Immediately after reception of the k-th CHANNEL REQUEST message (k being arbitrarily chosen by the SS from the set {4, 5 … 8}) the SS sends an IMMEDIATE ASSIGNMENT EXTENDED message which, instead of referencing one of the last 3 CHANNEL REQUEST messages from the MS, references an earlier CHANNEL REQUEST message. The MS shall then ignore the IMMEDIATE ASSIGNMENT EXTENDED message and continue to send CHANNEL REQUEST messages until the Max-Retrans value has been reached. Then a period of 7 seconds shall elapse in order to allow the MS to perform cell reselection (this allows for the time between the last CHANNEL REQUEST message and the beginning of cell reselection).

In the third part of the test, the CCCH_CONF of the SS is set to non-combined and the SS pages the MS, which shall react by sending CHANNEL REQUEST messages. Immediately after reception of the r-th CHANNEL REQUEST message (r being arbitrarily chosen by the SS from the set {4, 5 … 8}) the SS sends an IMMEDIATE ASSIGNMENT EXTENDED message which, in the second request reference, references one of the last 3 CHANNEL REQUEST messages from the MS. The associated Channel Description allocates SDCCH(S) (S being arbitrarily chosen by the SS from the set {0,1 … 7}). The MS shall then go to the correct channel and send a PAGING RESPONSE message. The SS will then release the channel.

Maximum Duration of Test

90 s.

Expected Sequence

Step

Direction

Message

Comments

1

SS -> MS

PAGING REQUEST TYPE 1

2

MS -> SS

CHANNEL REQUEST

n CHANNEL REQUESTs (n being arbitrarily chosen from {1…. 8} are sent, all with Establ. Cause = "Answer to paging".

3

MS -> SS

CHANNEL REQUEST

4

SS -> MS

IMMEDIATE ASSIGNMENT EXTENDED

see note 1.

5

MS -> SS

PAGING RESPONSE

6

SS -> MS

CHANNEL RELEASE

7

——–

——–

The SS waits 12 s to allow the MS to perform cell reselection.

8

SS -> MS

PAGING REQUEST TYPE 1

9

MS -> SS

CHANNEL REQUEST

k CHANNEL REQUESTs (k being arbitrarily chosen from the set {4, 5, 8}) are sent all with Establ. Cause = "Answer to paging".

10

MS -> SS

CHANNEL REQUEST

11

SS -> MS

IMMEDIATE ASSIGNMENT EXTENDED

see note 2.

12

MS -> SS

CHANNEL REQUEST

8-k CHANNEL REQUESTs are sent, all with Establ. Cause = "Answer to paging".

13

MS -> SS

CHANNEL REQUEST

14

SS

The SS verifies that the MS does not transmit any Layer 2 frames for at least 3 s.

15

SS

The SS sets CCCH_CONF to non-combined.

16

SS

The SS waits 40 s to allow the MS to perform cell reselection and to read the BCCH information.

17

SS -> MS

PAGING REQUEST TYPE 1

18

MS -> SS

CHANNEL REQUEST

r CHANNEL REQUESTs (r being arbitrarily chosenfrom {4, 5… 8} are sent, all with Establ. Cause = "Answer to paging".

19

MS -> SS

CHANNEL REQUEST

20

SS -> MS

IMMEDIATE ASSIGNMENT EXTENDED

see note 3.

21

MS -> SS

PAGING RESPONSE

22

SS -> MS

CHANNEL RELEASE

Specific Message Contents

NOTE 1: The first Request Reference is the one which pertains to the i-th CHANNEL REQUEST sent by the MS, where i is an integer in the set {max (1,n‑2) … n}, its value being arbitrarily chosen by the SS. The second Request Reference shall be different from any Request Reference the MS has generated in this test.

NOTE 2: The first Request Reference is the one which pertains to the i-th CHANNEL REQUEST sent by the MS, where i is an integer in the set {1 … k‑3}, its value being arbitrarily chosen by the SS. The second Request Reference shall be different from any Request Reference the MS has generated in this test.

NOTE 3: The second Request Reference is the one which pertains to the i-th CHANNEL REQUEST sent by the MS, where i is an integer in the set {r‑2, r‑1, r}, its value being arbitrarily chosen by the SS. The first Request Reference shall be different from any Request Reference the MS has generated in this test.

26.6.1.3 Immediate assignment / assignment rejection

26.6.1.3.1 Conformance requirements

1. The MS shall respond to the Paging Request message by sending a Channel Request message with establishment cause set to "Answer to Paging". After the reception of IMMEDIATE ASSIGNMENT REJECT, the MS shall not transmit during the time indicated in the "Wait Indication" field of the IMMEDIATE ASSIGNMENT REJECT message, and then it shall answer to the new paging requests.

2. After an assignment rejection, the MS shall perform a cell reselection (idle mode operation) and the MS shall not transmit unless a different cell is selected.

References

3GPP TS 04.08 / 3GPP TS 44.018, subclause 3.3.1.1.3 and 3GPP TS 04.13 subclause 5.2.2.

26.6.1.3.2 Test purpose

To verify that the MS can accept an IMMEDIATE ASSIGNMENT REJECT.

To verify that the MS can respond to paging after an IMMEDIATE ASSIGNMENT REJECT is received on a different cell.

26.6.1.3.3 Method of test

Initial Conditions

System Simulator:

2 cells with the same LAI, Max-Retrans is 7.

Mobile Station:

The MS is camped on cell A and is in the "idle, updated" state, with a TMSI allocated.

Specific PICS statements

PIXIT statements

Foreseen Final State of the MS

The MS is camped on cell B and is in the "idle, updated" state, with a TMSI allocated.

Test Procedure

The SS pages the MS, which shall react by sending CHANNEL REQUESTs. Immediately after reception of the n-th CHANNEL REQUEST (n being an integer from the set {1, 2 … 8}, arbitrarily chosen by the SS) the SS sends an IMMEDIATE ASSIGNMENT REJECT message, which references one of the last 3 CHANNEL REQUESTs from the MS, and with the Wait Indication set to x seconds (x being an integer from the set {5, 6 … 255}, arbitrarily chosen by the SS). The SS continues to send paging messages for that mobile station in every block of the mobile station’s paging subgroup for x+2 s. The MS shall not answer to the PAGING REQUEST TYPE 1 messages sent before x seconds have elapsed. The MS may respond to any one of the PAGING REQUEST TYPE 1 messages sent after x seconds have elapsed, but at the latest it shall respond to the first PAGING REQUEST TYPE 1 sent after x+1 seconds have elapsed.

The SS responds to this CHANNEL REQUEST with an IMMEDIATE ASSIGNMENT REJECT message with the Wait Indication set to 255 s.

Immediately afterwards the SS changes the power levels so the MS selects cell B. After 20 s have elapsed the SS pages the MS in cell B and the MS shall answer to this page. In order to avoid another cell reselection the SS then sends another IMMEDIATE ASSIGNMENT REJECT.

Maximum Duration of Test

5 minutes.

Expected Sequence

Step

Direction

Message

Comments

1

SS -> MS

PAGING REQUEST TYPE 1

2

MS -> SS

CHANNEL REQUEST

n CHANNEL REQUESTs (n being

.

.

.

arbitrarily chosen from the set {1, 2

.

.

.

… 8}) are sent, all with

1+n

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging"

2+n

SS -> MS

IMMEDIATE ASSIGNMENT REJECT

1st, 3rd and 4th Request References are different to all n Request References received from the MS under test. 2nd Request Reference: see note 1. 2nd Wait Indication = x seconds (x being arbitrarily chosen from the set {5 ,6 … 255}.

3+n

SS -> MS

PAGING REQUEST TYPE 1

The SS repeatedly pages the MS (on its paging subchannel) until a CHANNEL REQUEST message is received from the MS.

.

.

.

.

.

.

k

SS -> MS

PAGING REQUEST TYPE 1

(note 2).

k+1

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging".

The MS may respond to any one of the PAGING REQUEST TYPE 1 messages sent after x seconds expire, but at the latest the MS shall respond to the first PAGING REQUEST TYPE 1 message sent after x+1 seconds expire.

k+2

SS -> MS

IMMEDIATE ASSIGNMENT REJECT

1st, 2nd and 4th Request References are different to all n Request References received from the MS. The 3rd Request Reference pertains to the last CHANNEL REQUEST sent by the MS. The 3rd Wait Indication is 255 s.

k+3

——–

———-

Raise power level of cell B, lower power level of cell A until the MS selects cell B.

k+4

SS -> MS

PAGING REQUEST TYPE 1

Sent once, 20 s after the change of levels.

k+5

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging".

k+6

SS -> MS

IMMEDIATE ASSIGNMENT REJECT

NOTE 1: The Request Reference is the one which pertains to the i-th CHANNEL REQUEST sent by the MS, where i is an integer from the set {max(1,n‑2) … n}, its value being arbitrarily chosen by the SS.

NOTE 2: the value of k is not important in this test.

Specific Message Contents

None.

26.6.1.4 Immediate assignment / ignore assignment

26.6.1.4.1 Conformance requirements

1. An MS waiting for a response from the network, following the sending of a CHANNEL REQUEST, shall ignore an IMMEDIATE ASSIGNMENT message with a request reference containing a wrong frame number.

2. An MS is waiting for an assignment of its own, shall ignore an IMMEDIATE ASSIGNMENT message with a request reference containing a wrong random access information.

References

3GPP TS 04.08 / 3GPP TS 44.018, subclause 3.3.1.1.2

26.6.1.4.2 Test purpose

To verify that the MS ignores an assignment for another MS while it is waiting for an assignment of its own.

26.6.1.4.3 Method of test

Initial Conditions

System Simulator:

1 cell.

Mobile Station:

The MS is in the "idle, updated" state, with a TMSI allocated.

Specific PICS statements

PIXIT statements

Foreseen Final State of the MS

"Idle, updated", with TMSI allocated.

Test Procedure

The SS pages the MS, which reacts with CHANNEL REQUESTs. The SS responds to the first CHANNEL REQUEST with an IMMEDIATE ASSIGNMENT containing a wrong Request Reference (in the first run of the test the frame number is wrong, in the repetition it is the random access info that is wrong). It is verified for 2 s that the MS does not start signalling on the SDCCH. The MS shall ignore the assignment and send another CHANNEL REQUEST message. In order to avoid cell reselection the SS now answers with a correct IMMEDIATE ASSIGNMENT REJECT and repeats the test once.

Maximum Duration of Test

12 s.

Expected Sequence

Step

Direction

Message

Comments

1

SS -> MS

PAGING REQUEST TYPE 1

2

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging".

3

SS -> MS

IMMEDIATE ASSIGNMENT

Frame number in Request Reference is 2 too high. The MS shall not start signalling on the assigned SDCCH. This is verified for a period of 2 s.

4

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging".

5

SS -> MS

IMMEDIATE ASSIGNMENT REJECT

6

SS

SS waits for 6 s.

7

SS -> MS

PAGING REQUEST TYPE 1

8

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging".

9

SS -> MS

IMMEDIATE ASSIGNMENT

Random access info in Request Reference is wrong. The MS shall not start signalling on the assigned SDCCH. This is verified for a period of 2 s.

10

MS -> SS

CHANNEL REQUEST

Establ. Cause = "Answer to paging".

11

SS -> MS

IMMEDIATE ASSIGNMENT REJECT

Specific Message Contents

None.

26.6.1.5 Immediate assignment after immediate assignment reject

26.6.1.5.1 Conformance requirement

Following an IMMEDIATE ASSIGNMENT REJECT message, the MS shall listen for IMMEDIATE ASSIGNMENTS until T3126 expires.

Reference

3GPP TS 04.08 / 3GPP TS 44.018, subclause 3.3.1.1.3

26.6.1.5.2 Test purpose

To verify that the MS correctly responds to an IMMEDIATE ASSIGNMENT message sent after an IMMEDIATE ASSIGNMENT REJECT message.

26.6.1.5.3 Method of test

Initial conditions

System Simulator:

1 cell;

CCCH_CONF is set to "1 basic physical channel used for CCCH not combined with SDCCHs";

Max retrans is set to 7;

TX-integer is set to 7;

Mobile Station:

The MS is in "idle, updated" state, with a TMSI allocated.

Specific PICS statements

PIXIT statements

Foreseen final state of the MS

"idle, updated", with TMSI allocated.

Test Procedure

The SS pages the MS, which shall react by sending CHANNEL REQUESTs. Immediately after reception of the third CHANNEL REQUEST the SS sends an IMMEDIATE ASSIGNMENT REJECT message which references the first CHANNEL REQUEST from the MS and has the Wait Indication IE set to 6 s.

Between 0,75 s and 1,25 s after sending the IMMEDIATE ASSIGNMENT REJECT message the SS sends an IMMEDIATE ASSIGNMENT message referencing the second CHANNEL REQUEST message, and assigning an SDCCH. The MS shall go to the correct channel and send a PAGING RESPONSE message. Then the SS initiates RR-release by sending a CHANNEL RELEASE message.

Maximum duration of test

10 s.

Expected Sequence

Step

Direction

Message

Comments

1

SS -> MS

PAGING REQUEST TYPE 1

2

MS -> SS

CHANNEL REQUEST

first request.

3

MS -> SS

CHANNEL REQUEST

second request.

4

MS -> SS

CHANNEL REQUEST

third request.

5

SS -> MS

IMMEDIATE ASSIGNMENT REJ

references the first request from MS, Wait Indication IE set to 6 s.

6

SS -> MS

IMMEDIATE ASSIGNMENT

references the second request from the MS Channel type set to SDCCH/8 message sent between 0,75 s and 1,25 s after the completion of step 5.

7

MS -> SS

PAGING RESPONSE

shall be sent on the correct channel.

8

SS -> MS

CHANNEL RELEASE

Specific message contents

None.

26.6.1.6 Immediate assignment / implicit rejection

26.6.1.6.1 Conformance requirement

The network may at any time include an implicit reject indication for the PS domain or the CS domain within an IMMEDIATE ASSIGNMENT message using the IA Rest Octets IE (see sub-clause 10.5.2.16) or within an IMMEDIATE ASSIGNMENT REJECT or an IMMEDIATE ASSIGNMENT EXTENDED message using the Feature Indicator IE (see sub-clause 10.5.2.76) or within a PAGING REQUEST TYPE 1 message using the P1 Rest Octets IE (see sub-clause 10.5.2.23) or within a PAGING REQUEST TYPE 2 message using the P2 Rest Octets IE (see sub-clause 10.5.2.24) or within a PAGING REQUEST TYPE 3 message using the P3 Rest Octets IE (see sub-clause 10.5.2.25).

The RR entity of a mobile station configured for “low access priority” (see 3GPP TS 23.060), when attempting to establish a CS connection other than in case of an emergency call or when the mobile station is a member of an authorized special access class or sending a paging response shall, while ignoring MS identities included within PAGING REQUEST messages, start listening to the downlink CCCH until successfully decoding one of the RR messages listed in sub-clause 3.3.1.1.1a. If the RR message indicates an implicit reject for the CS domain (see sub-clause 3.3.1.1.1a) the mobile station shall abort the immediate assignment procedure and initiate the Implicit Reject procedure (see sub-clause 3.3.1.1.3.2a).

If the mobile station initiates this procedure due to implicit reject indication received for the CS domain (respectively PS domain) it starts timer T3234 (respectively timer T3236) and returns to idle mode. The mobile station is not allowed to make a mobile originated access attempt for the CS domain (respectively PS domain) in the same cell until T3234 (respectively T3236) expires or is stopped. If the mobile station receives a PAGING REQUEST message while T3234/T3236 is running it shall stop T3234/T3236 and respond to the PAGING REQUEST message.

Reference

3GPP TS 44.018 subclauses 3.3.1.1.1a, 3.3.1.1.2 and 3.3.1.1.3.2a.

26.6.1.6.2 Test purpose

To verify that the MS, if configured for LAP, activates the implicit reject timer when it reads a CCCH block that indicates that implicit reject condition is indicated.

To verify that the MS does not make any access attempt when the implicit reject timer is active

To verify that the MS, if configured for LAP, when waiting for a response to its initial or subsequent access attempt, detects an implicit reject condition but does not detect an access response within the allowed access response time window, will abort its access attempt and start the implicit reject timer.

26.6.1.6.3 Method of test

Initial conditions

System Simulator:

1 cell;

Mobile Station:

The MS is switched off.

The MS is configured for “low access priority” and “Extended Access Barring”

Max retrans is set to 7

Specific PICS statements

PIXIT statements

Foreseen final state of the MS

"idle, updated", with TMSI allocated.

Test Procedure

The MS is switched on and initiates the location updating procedure. When receiving the first CHANNEL REQUEST the SS issues a paging message that is not addressed to the MS but contains an indication that implicit reject is active. The MS reads the implicit rejection flag and starts timer T3234. SS checks that MS does not send further CHANNEL REQUESTs until minimum value of T3234 and re-attempts location updating procedure after maximum value of T3234.The SS sends an IMMEDIATE ASSIGNMENT message which includes the implicit reject flag. The MS abort the immediate assignments procedure and starts timer T3234. SS checks that MS does not send another CHANNEL REQUEST until minimum value of T3234 and re-attempts location updating procedure after maximum value of T3234.MS performs a successful location updating procedure.

Maximum duration of test

7 minutes.

Expected Sequence

Step

Direction

Message

Comments

1

MS

Make the MS perform the location updating procedure

MS

CHANNEL REQUEST

Mobile may send up to MaxRetrans+1 CHANNEL REQUEST until PAGING REQUEST TYPE 1 in step 2 is received.

2

SS -> MS

PAGING REQUEST TYPE 1

1st Mobile Identity does not contain TMSI of MS but with the Implicit Reject CS bit set to “1”.

3

MS

Timer T3234 (random value drawn from the following set: {10.0, 10.1, 10.2, …200.0} seconds) is active.

MS

MS discards all further CHANNEL REQUESTS from access attempt

4

MS -> SS

CHANNEL REQUEST

Not received within 10 seconds after step 2. May be sent within 10 and 200 seconds. Shall be sent after 200 seconds.

"Establishment cause": Location updating.

5

SS -> MS

IMMEDIATE ASSIGNMENT

The Implicit Reject CS bit set to “1”.

6

MS

Timer T3234 (random value drawn from the following set: {10.0, 10.1, 10.2, …200.0} seconds) is active.

7

MS -> SS

CHANNEL REQUEST

Not received within 10 seconds after step 5. May be sent within 10 and 200 seconds. Shall be sent after 200 seconds.

"Establishment cause": Location updating.

8

SS -> MS

IMMEDIATE ASSIGNMENT

9

MS -> SS

LOCATION UPDATING REQUEST

"location updating type" = normal

10

SS -> MS

LOCATION UPDATING ACCEPT

11

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.

26.6.1.7 Void