4 Non-transparent cases

09.103GPPTS

4.1 General

For interworking other than the mapping of information fields, see GSM 09.08.

4.2 Outgoing call set-up (MS originating call)

Figure 3 shows those elements of a call set-up sequence which require interworking between BSSAP and MAP. BSSAP messages which do not require interworking with MAP are not shown.

MS MSC VLR

CM SERVICE REQUEST

———————–> MAP_PROCESS_ACCESS_REQUEST request

———————————->

+————————–+

| Possibly |

| identification procedure/|

| authentication procedure |

+————————–+

MAP_SET_CIPHERING_MODE request

<———————————-

(Note 1)

MAP_PROCESS_ACCESS_REQUEST response

CM SERVICE ACCEPT <———————————

<———————– positive result (Note 1)

(Note 2)

CIPHER MODE COMMAND

<———————–

(Note 2)

CIPHER MODE COMPLETE

———————–>

MAP_FORWARD_NEW_TMSI request

TMSI REALLOCATION COMMAND <———————————-

<———————– (Note 3)

TMSI REALLOCATION COMPLETE

———————–> MAP_FORWARD_NEW_TMSI response

———————————->

MAP_PROCESS_ACCESS_REQUEST response

CM SERVICE REJECT <———————————

<———————– negative result, MAP_U/P_ABORT,

(Note 4) MAP_NOTICE, MAP_CLOSE

SETUP (Note 5)

———————–> MAP_SEND_INFO_FOR_OUTGOING_CALL

———————————->

request

MAP_COMPLETE_CALL request

CALL PROCEEDING <———————————-

<———————–

MAP_SEND_INFO_FOR_OUTGOING_CALL

RELEASE COMPLETE <———————————-

<———————– response, MAP_U/P_ABORT,

(Note 6) MAP_NOTICE, MAP_CLOSE

Figure 3: Part of outgoing call set-up sequence

NOTE 1: If the MSC received a MAP_SET_CIPHERING_MODE request, it stores it until it receives the MAP_PROCESS_ACCESS_ REQUEST response.

NOTE 2: CM SERVICE ACCEPT is sent only if the ciphering procedure is not invoked.

NOTE 3: TMSI reallocation need not be sequenced with other messages, but should be sent after ciphering.

NOTE 4: CM SERVICE REJECT is sent as a result of a user error parameter in the MAP_PROCESS_ACCESS_REQUEST response, or termination of the MAP dialogue.

NOTE 5: The SETUP message is sent after the MS has either received a CM SERVICE ACCEPT or sent a CIPHER MODE COMPLETE.

NOTE 6: RELEASE COMPLETE is sent as a result of a user error parameter in the MAP_SEND_INFO_FOR_OUTGOING_CALL response, or termination of the MAP dialogue.

The procedure can be considered in two parts: the handling of the CM SERVICE REQUEST and the handling of the SETUP request.

The procedure is initiated by the MS sending a CM SERVICE REQUEST message. The MSC will forward the service request to the VLR in the MAP_PROCESS_ACCESS_REQUEST request. The VLR may then invoke other operations, e.g. authentication and identification. These operations are defined in subclauses 3.4 and 3.5.

If there is a positive outcome for the CM SERVICE REQUEST procedure, the VLR always sends a MAP_PROCESS_ACCESS_REQUEST response. If the request is for a first MM-connection and ciphering is required, the MAP_PROCESS_ACCESS_REQUEST response is preceded by a MAP_SET_CIPHERING_MODE request. In this case the MSC sends a CIPHER MODE COMMAND towards the MS. The interworking for cipher mode setting is described in subclause 4.4. If the request is for an additional MM-connection or for a first MM-connection where ciphering is not required, then the positive MAP_PROCESS_ACCESS_ REQUEST response causes the MSC to send a CM SERVICE ACCEPT message to the MS. After cipher mode setting has been completed or the CM SERVICE ACCEPT message has been returned, the MS will send the SETUP (or EMERGENCY SETUP) message and information retrieval takes place as shown.

A negative outcome for the MAP_PROCESS_ACCESS_REQUEST procedure can be signalled by a MAP_PROCESS_ACCESS_REQUEST response containing a user error parameter, or by terminating the MAP dialogue between the MSC and the VLR.

A positive outcome for the call setup procedure is indicated by a MAP_COMPLETE_CALL request from the VLR to the MSC, which causes the MSC to send a CALL PROCEEDING message towards the MS.

A negative outcome for the call setup procedure can be signalled by a MAP_SEND_INFO_FOR_INCOMING_CALL response or by terminating the dialogue between the MSC and the VLR.

Information element mapping is required between the messages:

– CM SERVICE REQUEST to MAP_PROCESS_ACCESS_REQUEST request;

– SETUP to MAP_SEND_INFO_FOR_OUTGOING CALL request;

– MAP_SEND_INFO_FOR_OUTGOING_CALL response, MAP_U/P_ABORT, MAP_NOTICE or premature MAP_CLOSE to RELEASE COMPLETE or CM SERVICE REJECT.

The information contained in the MAP_COMPLETE_CALL request is not transmitted on the radio interface but is used in the MSC for connecting the call.

The conversion of information elements is as follows:

—————————————————————

| 08.08/04.08 09.02 |Notes

——–┼————————————————┼—–

Forward | COMPLETE LAYER 3 INFO MAP_PROCESS_ACCESS_ |

| (CM SERVICE REQUEST) REQUEST request |

| |

| CM Service type CM Service type | 1

| Ciphering key CKSN |

| sequence number |

| Mobile identity TMSI or IMSI or IMEI |

| Mobile station |

| Classmark 2 – |

| |

| Cell identifier Current LA Id | 4

| Chosen channel – |

| – Access Connection |

| Status | 3

——–┼————————————————┼—–

Positive| DTAP(CM SERVICE ACCEPT) MAP_PROCESS_ACCESS_ |

result | REQUEST response | 2

——–┼————————————————┼—–

Negative| DTAP(CM SERVICE REJECT) MAP_PROCESS_ACCESS_ |

result | REQUEST response |

| |

| IMSI unknown in VLR Unidentified |

| Subscriber |

[ | Requested service ??????? |

| option not |

| subscribed |]

| Illegal ME Illegal equipment |

| Network failure System failure |

| Network failure MAP_U/P_ABORT |

| Network failure MAP_NOTICE |

| Network failure MAP_CLOSE |

——–┼————————————————┼—–

| DTAP(AUTHENTICATION MAP_PROCESS_ACCESS_ |

| REJECT) REQUEST response |

| |

| Illegal subscriber |

——–┴————————————————┴—–

NOTE 1: Indicates, in this case, a mobile originating call establishment or an emergency call establishment.

NOTE 2: The CM SERVICE ACCEPT is sent when the ciphering procedure is not invoked.

NOTE 3: Indicates whether or not an RR-connection exists and whether or not ciphering has been started.

NOTE 4: The Current LA Id parameter is derived by the MSC from the Cell identifier information element.

—————————————————————

| 04.08 09.02 |Notes

——–┼————————————————┼—–

Forward | SETUP MAP_SEND_INFO_FOR_ |

message | OUTGOING_CALL request |

| |

| BC repeat indicator – |

| Bearer capability 1 – | 3

| Bearer capability 2 – | 3

| Calling party subaddress – |

| Called party BCD number Called Number |

| Called party subaddress – |

| LLC repeat indicator – |

| Low layer compatibility I – |

| Low layer compatibility II – |

| HLC repeat indicator – |

| High layer compatibility i – |

| High layer compatibility ii – |

| – Bearer service | 3

| – Teleservice | 3

| Facility – | 1

| – CUG index | 4

| – Suppress pref CUG | 4

| – Suppress CUG OA | 4

| User-user – |

| SS version – |

| CLIRO flag – |

——–┼————————————————┼—–

Positive| |

result | | 2

——–┼————————————————┼—–

Negative| RELEASE COMPLETE MAP_SEND_INFO_FOR_ |

result | OUTGOING_CALL response|

| |

| TS GSM 04.10 Call Barred |

| Barring Service |

| Active |

| Operator determined Call Barred |

| barring Operator Determined|

| Barring |

| Network out of order Data Missing |

| Network out of order Unexpected Data Value |

| Network out of order System Failure |

| Bearer capability Bearer service not |

| not authorized provisioned |

| Bearer capability Teleservice not |

| not authorized provisioned |

| [User not member of CUG] CUG reject |

| |

| Network out of order MAP_U/P_ABORT |

| Network out of order MAP_NOTICE |

| Network out of order MAP_CLOSE |

——–┴————————————————┴—–

NOTE 1: If the Facility IE contains CUG information, the CUG information is transferred to the VLR in the MAP_SEND_INFO_FOR_OUTGOING_CALL service; any other information contained in a Facility IE is transferred to the VLR in a MAP Supplementary Services related service.

NOTE 2: The call setup parameters retrieved from the VLR are not sent to the MS. The parameters are carried in the MAP_COMPLETE_CALL service.

NOTE 3: The bearer capabilities can be used to derive the bearer/tele service.

NOTE 4: CUG information is derived from the contents of the Facility IE.

4.3 Incoming call set-up (MS terminating call)

Figure 4 shows those elements of the procedure which require interworking between MAP and GSM 04.08 procedures.

MS MSC VLR

+————————–+

| Info retrieval |

+————————–+

MAP_PAGE request or

PAGE REQUEST <———————————-

<———————– MAP_SEARCH_FOR_MS request

(Note 1)

PAGING RESPONSE

———————–> MAP_SEARCH_FOR_MS response (Note 2)

———————————->

MAP_PROCESS_ACCESS_REQUEST request

———————————->

+————————–+

| Possibly |

| authentication procedure |

+————————–+

MAP_SET_CIPHERING_MODE request

<———————————-

(Note 3)

MAP_PROCESS_ACCESS_REQUEST response

CIPHER MODE COMMAND <———————————

<———————– positive result (Note 4)

(Note 3)

CIPHER MODE COMPLETE

———————–>

MAP_FORWARD_NEW_TMSI request

TMSI REALLOCATION COMMAND <———————————-

<———————– (Note 5)

TMSI REALLOCATION COMPLETE

———————–> MAP_FORWARD_NEW_TMSI response

———————————->

MAP_COMPLETE_CALL request

SETUP <———————————-

<———————–

MAP_SEND_INFO_FOR_INCOMING_CALL

RELEASE COMPLETE <———————————

<———————– response negative result,

(Note 6) MAP_U/P_ABORT,MAP_NOTICE, MAP_CLOSE

Figure 4: Incoming call set-up

NOTE 1: If an MM connection already exists, the PAGE REQUEST is not sent. If the call can be accepted, the MSC sends a MAP_PROCESS_ACCESS_REQUEST request in response to the MAP_PAGE request. If the call cannot be accepted the MSC sends a MAP_PAGE response containing the error ‘busy subscriber’.

NOTE 2: Sent only if MAP_SEARCH_FOR_MS was used.

NOTE 3: Needed only if a ciphered MM-connection does not exist already.

NOTE 4: If the MSC received a MAP_SET_CIPHERING_MODE request, it stores it until it receives the MAP_PROCESS_ACCESS_ REQUEST response.

NOTE 5: TMSI reallocation need not be sequenced with other messages, but should be sent after ciphering.

NOTE 6: RELEASE COMPLETE is sent as a result of a user error parameter in the MAP_SEND_INFO_FOR_OUTGOING_CALL response, or termination of the MAP dialogue.

The paging procedure is controlled by the VLR. It may be followed by authentication (subclause 3.4), ciphering (subclause 4.4) and reallocation of TMSI(subclause 3.6). The SETUP message is sent when the MAP_COMPLETE_CALL request is received.

Normally there is no interworking between the MAP_COMPLETE_CALL request and the SETUP message. However, the MAP_COMPLETE_CALL request may contain a bearer service indication which will be used to establish the bearer capabilities at the MSC. The interworking between the MAP_PAGE request or MAP_SEARCH_FOR_MS request and the BSSMAP PAGING REQUEST message is as follows:

—————————————————————

| 08.08/04.08 09.02 |Notes

——–┼————————————————┼—–

Forward | PAGING REQUEST MAP_PAGE request or |

message | MAP_SEARCH_FOR_MS request |

| |

| IMSI IMSI |

| TMSI TMSI | 1

| Cell identifier Stored LA Id |

| list |

——–┼————————————————┼—–

Backward| COMPLETE LAYER 3 INFO MAP_PROCESS_ACCESS_ |

message | (PAGING RESPONSE) REQUEST request |

| |

| – CM service type | 2

| Ciphering key CKSN |

| sequence number |

| Mobile identity TMSI or IMSI |

| Mobile station |

| classmark 2 – |

| Cell Identifier Current LA Id | 3

| – Access connection |

| status |

| Chosen channel – |

——–┴————————————————┴—–

NOTE 1: If TMSI is included, the TMSI is used as the mobile identity in the GSM 04.08 PAGE REQUEST message, otherwise the IMSI is used as the mobile identity.

NOTE 2: In this case the MAP CM service type is set to ‘mobile terminating call’.

NOTE 3: The Target LA Id parameter is derived by the MSC from the Cell identifier information element.

4.4 Cipher mode setting

The interworking is as follows:

—————————————————————

| 08.08 09.02 |Notes

——–┼————————————————┼—–

Forward | CIPHER MODE COMMAND MAP_SET_CIPHERING_MODE |

| request |

| |

| Cipher mode setting Ciphering mode |

| Encryption information Kc | 1

——–┼————————————————┼—–

Positive| CIPHER MODE COMPLETE None |

result | |

——–┼————————————————┼—–

Negative| CIPHER MODE REJECT None |

result | |

——–┴————————————————┴—–

NOTE 1: The key Kc is passed through the BSS to the BTS, but is not passed to the MS.

4.5 Inter-MSC Handover

The general principles of the handover procedures are given in Technical Specification GSM 03.09. GSM 09.10 gives the necessary information for interworking between the GSM 08.08 handover protocol and the GSM 09.02 MAP protocol.

4.5.1 Basic Inter-MSC Handover

When a Mobile Station is handed over between two MSCs, the establishment of a connection between them (described in GSM 03.09) requires interworking between A-Interface and E-Interface.

The signalling at initiation, execution, completion of the Basic Inter-MSC handover procedure is shown in figures 5 to 10 with both possible positive or negative outcomes.

Additionally figures 5b and 5c show the possible interworking when trace related messages are transparently transferred on the E-Interface at Basic Inter-MSC Handover initiation.

BSS-A MSC-A MSC-B

| | |

|HANDOVER | |

|————–>|MAP PREPARE HANDOVER |

|REQUIRED |————————>| +—————-+

| |request | |Possible Alloc. |

| | | |of a handover |

| | | |no. in the VLR-B|

| | | +—————-+

| | |

| | | BSS-B

| | | |

| | |HANDOVER REQUEST |

| | |——————>|

Figure 5a: Signalling for Basic Inter-MSC Handover initiation (no trace related messages transferred)

BSS-A MSC-A MSC-B

|BSC INVOKE TRACE |

|————–>| |

| | |

|HANDOVER | |

|————–>|MAP PREPARE HANDOVER |

|REQUIRED |————————>| +—————-+

| |request (*) | |Possible Alloc. |

| | | |of a handover |

| | | |no. in the VLR-B|

| | | +—————-+

| | |

| | | BSS-B

| | | |

| | |HANDOVER REQUEST |

| | |——————>|

| | | |

| | |BSC INVOKE TRACE |

| | |—————->(**)

Figure 5b: Signalling for Basic Inter-MSC Handover initiation (BSC invoke trace message transferred)

(*): In that case, HANDOVER REQUEST and BSC INVOKE TRACE messages are included within the BSS-apdu parameter.

(**): BSC INVOKE TRACE is forwarded to BSS-B if supported by MSC-B.

BSS-A MSC-A MSC-B

| (*) |

|HANDOVER | |

|————–>|MAP PREPARE HANDOVER |

|REQUIRED |————————>| +—————-+

| |request (**) | |Possible Alloc. |

| | | |of a handover |

| | | |no. in the VLR-B|

| | | +—————-+

| | |

| | | BSS-B

| | | |

| | |HANDOVER REQUEST |

| | |——————>|

| | | |

| | |MSC INVOKE TRACE |

| | |—————>(***)

Figure 5c: Signalling for Basic Inter-MSC Handover initiation (MSC invoke trace message transferred)

(*): Tracing invocation has been received from VLR.

(**): In that case, HANDOVER REQUEST and MSC INVOKE TRACE messages are included within the BSS-apdu parameter.

(***): MSC INVOKE TRACE is forwarded to BSS-B if supported by MSC-B.

Possible Positive outcomes

a) successful radio resources allocation and handover number allocation (if performed):

BSS-A MSC-A MSC-B BSS-B

| | | |

| | |HANDOVER REQUEST |

| | |<——————|

| | |ACKNOWLEDGE |

| | MAP PREPARE HANDOVER | |

| |<————————| |

| | response | |

| | | |

|HANDOVER COMMAND | |

|<————–| | |

b) radio resources allocation queued and successful handover number allocation (if performed). Later successful radio resources allocation indication:

BSS-A MSC-A MSC-B BSS-B

| | | |

| | |QUEUING INDICATION |

| | |<——————|

| |MAP PREPARE HANDOVER | |

| |<————————| |

| | response | |

| | |HANDOVER REQUEST |

| | |<——————|

| | |ACKNOWLEDGE |

| |MAP PROCESS ACCESS | |

| |<————————| |

HANDOVER COMMAND| SIGNALLING request | |

|<————–| | |

| | | |

Figure 6: Signalling for Basic Inter-MSC Handover execution (Positive outcomes)

Possible Negative outcomes

c) user error detected, or handover number allocation unsuccessful (if performed), or component rejection or dialogue abortion performed by MSC-B:

BSS-A MSC-A MSC-B BSS-B

| | | |

| |MAP PREPARE HANDOVER response |

| |negative result, MAP CLOSE |

| |<————————| |

| |MAP U/P-ABORT | |

|HANDOVER REQUIRED | |

|<————–| | |

|REJECT (Note 1)| | |

| | | |

d) radio resources allocation failure:

BSS-A MSC-A MSC-B BSS-B

| | | |

| | |HANDOVER FAILURE |

| | |<——————|

| |MAP PREPARE HANDOVER | |

| |<————————| |

| | response | |

|HANDOVER REQUIRED | |

|<————–| | |

|REJECT (Note 1)| | |

| | | |

e) radio resources allocation queued and successful handover number allocation (if performed). Later unsuccessful radio resources allocation:

BSS-A MSC-A MSC-B BSS-B

| | | |

| | |QUEUING INDICATION |

| | |<——————|

| |MAP PREPARE HANDOVER | |

| |<————————| |

| | response | |

| | | |

| | |HANDOVER FAILURE |

| | |<——————|

| |MAP PROCESS ACCESS | |

| |<————————| |

| | SIGNALLING request | |

|HANDOVER REQUIRED | |

|<————–| | |

|REJECT (Note 1)| | |

f) unsuccessful handover execution (Reversion to the old channel):

BSS-A MSC-A MSC-B BSS-B

| | | |

|HANDOVER | | |

|————–>| | |

|FAILURE | | |

| |MAP U -ABORT | |

| |————————>| |

| | |CLEAR COMMAND |

| | |——————>|

| | | |

Figure 7: Signalling for Basic Inter-MSC Handover execution (Negative outcomes)

NOTE: Possible rejection of the handover because of the negative outcome of MAP or BSSMAP procedure.

BSS-A MSC-A MSC-B BSS-B

| | | |

| | |HANDOVER COMPLETE |

| | |<——————|

| |MAP SEND END SIGNAL request |

| |<————————| |

|CLEAR COMMAND | | |

|<————–| | |

| | | |

Figure 8: Signalling for Basic Inter-MSC Handover completion

Positive outcome

BSS-A MSC-A MSC-B BSS-B

| | | |

| |MAP SEND END SIGNAL | |

| |————————>| |

| | response |CLEAR COMMAND |

| | |——————>|

| | | (Note 1) |

Figure 9: Signalling for Basic Inter-MSC Handover completion (Positive outcome)

Negative outcome

BSS-A MSC-A MSC-B BSS-B

| | | |

| | MAP U/P -ABORT | |

| |————————>| |

| | |CLEAR COMMAND |

| | |——————>|

| | | |

Figure 10: Signalling for Basic Inter-MSC Handover completion (Negative outcome)

NOTE: From interworking between MAP and BSSMAP point of view.

The handover procedure is normally triggered by BSS-A by sending a HANDOVER REQUIRED message on A-Interface to MSC-A. The invocation of the Basic Inter-MSC handover procedure is performed and controlled by MSC-A. The sending of the MAP Prepare-Handover request to MSC-B is triggered in MSC-A upon receipt of the HANDOVER REQUIRED message. For compatibility reason, the cell identity of the cell where the call is to be handed over in MSC-B area, provided in the HANDOVER REQUIRED message, is mapped into targetCellId MAP parameter and the HANDOVER REQUEST message is encapsulated in the bss-APDU MAP parameter of the Prepare-Handover MAP request. MSC-B can invoke another operation towards the VLR-B (allocation of the handover number described in GSM 09.02).

Additionally, if tracing activity has been invoked, the trace related messages can be transferred on the E-Interface encapsulated in the bss-APDU MAP parameter of the Prepare-Handover Request. If transferred, one complete trace related message at a time shall be included in the bss-APDU MAP parameter after the HANDOVER REQUEST message.

The interworking between Prepare Handover and HANDOVER REQUIRED is as follows:

—————————————————————-

| 08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward | HANDOVER REQUIRED MAP PREPARE HANDOVER request|

message | |

| -ho-NumberNotRequired| 1

| BSSMAP information -targetCellId |

| elements -bss-APDU( | 2

| HANDOVER REQUEST, |

| BSC INVOKE TRACE | 3

| or MSC INVOKE TRACE) |

——–┼————————————————-┼—–

Positive| MAP PREPARE HANDOVER response|

result | | 4

| -handover number |

| -bss-APDU( |

| QUEUING INDICATION |

| or HANDOVER REQUEST|

| ACKNOWLEDGE or |

| HANDOVER FAILURE) |

——–┼————————————————-┼—–

Negative| HANDOVER REQUIRED REJECT MAP PREPARE HANDOVER| 5

result | |

| equipment failure System Failure |

| equipment failure No Handover Number |

| available |

| equipment failure UnexpectedDataValue|

| equipment failure Data Missing |

| |

| equipment failure MAP CLOSE |

| equipment failure MAP U/P -ABORT |

| |

NOTE 1: The ho-NumberNotRequired parameter is included by MSC-A, when MSC-A decides not to use any circuit connection with MSC-B. No handover number shall be present in the positive result. Any negative response from MSC-B shall not be due to handover number allocation problem.

NOTE 2: The process performed on the BSSMAP information elements received in the HANDOVER REQUIRED message is described in the GSM Recommendation 08.08.

NOTE 3: The process performed on the BSSMAP information elements received in the MSC or BSC INVOKE TRACE message is described in subclause 4.5.6.6.

NOTE 4: The response to the Prepare-Handover request can include in its bss-APDU parameter, identifying the GSM-0806 protocol, either a BSSMAP QUEUING INDICATION, or a BSSMAP HANDOVER REQUEST ACKNOWLEDGE or a BSSMAP HANDOVER FAILURE.

In the first case, MSC-A shall wait for the radio resources allocation response from MSC-B, transmitted to MSC-A as described in subclause 4.5.4.

In the second case, the positive result triggers in MSC-A the sending on A-Interface of the HANDOVER COMMAND.

In the third case, the positive result triggers in MSC-A one of the following:

– another handover attempt is initiated by MSC-A

– optionally the sending of the HANDOVER REQUIRED REJECT.

(The possible sending of the HANDOVER REQUIRED REJECT message upon receipt of the HANDOVER FAILURE is out of the scope of the GSM 09.10 and lies in the GSM 08.08).

NOTE 5: The possible sending of the HANDOVER REQUIRED REJECT message is described in the GSM 08.08.

The interworking between Send End Signal and HANDOVER COMPLETE in MSC-B is as follows:

—————————————————————-

| 08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward | HANDOVER COMPLETE MAP SEND END SIGNAL request |

message | |

| -bss-APDU( |

| HANDOVER COMPLETE)|

| |

——–┼————————————————-┼—–

Positive| CLEAR COMMAND MAP SEND END SIGNAL response|

result | -Call Control release | 1

——–┼————————————————-┼—–

Negative| CLEAR COMMAND |

result | -Call Control release MAP CLOSE | 2

| -Call Control release MAP U/P -ABORT |

| |

NOTE 1: The positive empty result triggers the clearing of the Radio Resources on the A-Interface and the release of the SCCP connection between MSC-B and BSS-B. If a circuit connection is used between MSC-A and MSC-B, the ‘Call Control release’ clearing cause shall only be given to BSS-B when MSC-B has received a clearing indication on its circuit connection with MSC-A.

NOTE 2: The abortion of the dialogue or the rejection of the component triggers in MSC-B the clearing of its circuit connection with MSC-A, if any, of the Radio Resources on the A-Interface and the release of the SCCP connection between MSC-B and BSS-B.

The interworking between Send End Signal and CLEAR COMMAND in MSC-A is as follows:

—————————————————————-

| 09.02 08.08 |Notes

——–┼————————————————-┼—–

Forward | MAP SEND END SIGNAL CLEAR COMMAND |

message | response |

| -bss-APDU( – Handover |

| HANDOVER COMPLETE) Successful |

——–┼————————————————-┼—–

Positive| |

result | |

——–┼————————————————-┼—–

Negative| |

result | |

The interworking between HANDOVER FAILURE in case of reversion to old channel of the MS and User Abort in MSC-A is as follows:

—————————————————————-

| 08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward | HANDOVER FAILURE MAP U -ABORT |

message | |

| – Reversion to old |

| channel |

——–┼————————————————-┼—–

Positive| |

result | |

——–┼————————————————-┼—–

Negative| |

result | |

4.5.2 Subsequent Inter-MSC Handover back to MSC-A

When a Mobile Station is being handed over back to MSC-A, the procedure (described in GSM 03.09) requires interworking between A-Interface and E-Interface.

The signalling at initiation, execution and completion of the Subsequent Inter-MSC handover procedure is shown in figures 11 to 15.

BSS-A MSC-B MSC-A

| | |

|HANDOVER | |

|————–>|MAP PREPARE SUBSEQUENT |

|REQUIRED |————————>|

| |HANDOVER request |

| | | BSS-B

| | | |

| | |HANDOVER REQUEST |

| | |——————>|

Figure 11: Signalling for Subsequent Inter-MSC Handover back to MSC-A initiation

Possible Positive outcomes

a) successful radio resources allocation:

BSS-A MSC-B MSC-A BSS-B

| | | |

| | |HANDOVER REQUEST |

| | |<——————|

| | |ACKNOWLEDGE |

| | MAP PREPARE SUBSEQUENT | |

| |<————————| |

| | HANDOVER response | |

|HANDOVER COMMAND | |

|<————–| | |

b) radio resources allocation queued. Later successful radio resources allocation indication:

BSS-A MSC-B MSC-A BSS-B

| | |QUEUING INDICATION |

| | |<——————|

| | MAP PREPARE SUBSEQUENT | |

| |<————————| |

| | HANDOVER response | |

| | |HANDOVER REQUEST |

| | |<——————|

| | |ACKNOWLEDGE |

| | MAP FORWARD ACCESS | |

| |<————————| |

| | SIGNALLING request | |

|HANDOVER COMMAND | |

|<————–| | |

Figure 12: Signalling for Subsequent Inter-MSC Handover back to MSC-A execution (Positive outcome)

Possible Negative outcomes

c) user error detected, or component rejection or dialogue abortion performed by MSC-A:

BSS-A MSC-B MSC-A BSS-B

| |MAP PREPARE SUBSEQUENT HANDOVER |

| |<————————| |

|HANDOVER REQUIRED response negative result |

|<————–| | |

|REJECT (Note 1)| | |

| | | |

d) component rejection or dialogue abortion performed by MSC-A:

BSS-A MSC-B MSC-A BSS-B

| |MAP CLOSE, MAP U/P ABORT | |

| |<————————| |

|CLEAR COMMAND | | |

|<————–| | |

| | | |

e) radio resources allocation failure:

BSS-A MSC-B MSC-A BSS-B

| | | HANDOVER FAILURE |

| | |<——————|

| |MAP PREPARE SUBSEQUENT | |

| |<————————| |

|HANDOVER REQUIRED HANDOVER response | |

|<————–| | |

|REJECT (Note 1)| | |

f) radio resources allocation queued. Later unsuccessful radio resources allocation:

BSS-A MSC-B MSC-A BSS-B

| | |QUEUING INDICATION |

| | |<——————|

| | MAP PREPARE SUBSEQUENT | |

| |<————————| |

| | HANDOVER response | |

| | |HANDOVER FAILURE |

| | |<——————|

| | MAP FORWARD ACCESS | |

| |<————————| |

|HANDOVER REQUIRED SIGNALLING request | |

|<————–| | |

|REJECT (Note 1)| | |

Figure 13: Signalling for Subsequent Inter-MSC Handover back to MSC-A execution
(Negative outcome)

NOTE 1: Possible rejection of the handover because of the negative outcome of MAP or BSSMAP procedure.

BSS-B MSC-A MSC-B BSS-A

| | | |

|HANDOVER | | |

|————–>|MAP SEND END SIGNAL | |

|COMPLETE |————————>| |

| | response | |

| | |CLEAR COMMAND |

| | |——————>|

Figure 14: Signalling for Subsequent Inter-MSC Handover back to MSC-A completion
(Successful completion of the procedure)

NOTE: Positive outcome case shown in figure 9.

BSS-B MSC-A MSC-B BSS-A

| | | |

|HANDOVER | | |

|————–>|MAP SEND END SIGNAL | |

|COMPLETE |————————>| |

| | response | |

| | | |

| |MAP U/P -ABORT | |

| |<————————| |

| | |CLEAR COMMAND |

| | |——————>|

| | |(Note 1) |

Figure 15: Signalling for Subsequent Inter-MSC Handover back to MSC-A completion (Unsuccessful completion of the procedure)

NOTE 1: Abnormal end of the procedure which triggers the clearing of all resources in MSC-B.

The interworking between Prepare Subsequent Handover and HANDOVER REQUIRED is as follows:

—————————————————————-

| 08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward |HANDOVER REQUIRED MAP PREPARE SUBSEQUENT HANDOVER|

message | request | 1

| |

| -target MSC number |

| BSSMAP information -targetCellId |

| elements -bss-APDU( |

| HANDOVER REQUEST) |

——–┼————————————————-┼—–

Positive|HANDOVER REQUIRED MAP PREPARE SUBSEQUENT HANDOVER|

result | response | 2

| -bss-APDU( |

| QUEUING INDICATION |

| or HANDOVER REQUEST|

| ACKNOWLEDGE or |

| HANDOVER FAILURE) |

——–┼————————————————-┼—–

Negative| HANDOVER REQUIRED REJECT MAP PREPARE SUBSEQUENT| 3

result | HANDOVER response |

| equipment failure Unknown MSC |

| equipment failure Subsequent Handover|

| Failure |

| equipment failure UnexpectedDataValue|

| equipment failure Data Missing |

| |

| CLEAR COMMAND |

| |

| equipment failure MAP CLOSE |

| equipment failure MAP U/P -ABORT |

| |

NOTE 1: The processing performed on the BSSMAP information elements received in the HANDOVER REQUIRED message is out of the scope of this TS. The target MSC number is provided to MSC-A by MSC-B based on the information received from BSS-B.

NOTE 2: The response to the Prepare-Subsequent-Handover request can include in its bss-APDU parameter, identifying the GSM-0806 protocol, either a BSSMAP QUEUING INDICATION, or a BSSMAP HANDOVER REQUEST ACKNOWLEDGE or a BSSMAP HANDOVER FAILURE.

In the first case, MSC-B shall wait for the radio resources allocation response from MSC-A, transmitted to MSC-B as described in subclause 4.5.4.

In the second case, the positive result triggers in MSC-B the sending on A‑Interface of the HANDOVER COMMAND.

In the third case, the positive result triggers in MSC-B one of the following:

– another handover attempt is initiated by MSC-B;

– optionally the sending of the HANDOVER REQUIRED REJECT.

(The possible sending of the HANDOVER REQUIRED REJECT message upon receipt of the HANDOVER FAILURE is out of the scope of the GSM 09.10 and lies in the GSM 08.08).

NOTE 3: The possible sending of the HANDOVER REQUIRED REJECT message is described in the GSM 08.08.

The interworking between Send End Signal Result and HANDOVER COMPLETE in MSC-A is as follows:

—————————————————————-

| 08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward | HANDOVER COMPLETE MAP SEND END SIGNAL |

message | response |

| |

——–┼————————————————-┼—–

Positive| |

result | |

——–┼————————————————-┼—–

Negative| |

result | MAP U/P -ABORT | 1

| |

NOTE 1: The abortion of the dialogue ends the handover procedure with MSC-B.

4.5.3 Subsequent Inter-MSC Handover to third MSC

When a Mobile Station is being handed over to a third MSC, the procedure (described in GSM 03.09) does require one specific interworking case in MSC-A (figure 20) between E-Interface from MSC-B and E-Interface from MSC-B’ other than the combination of the ones described in the subclause 4.5.1 and 4.5.2.

BSS-A MSC-B MSC-A MSC-B’

| | | |

|HANDOVER | | |

|———–>|MAP PREPARE SUSEQUENT | |

|REQUIRED |———————>| |

| |HANDOVER request |MAP PREPARE |

| | |—————>|

| | |HANDOVER request|

| | | |+——-+

| | | ||Possib.|

| | | ||Alloc. |

| | | ||of ho. |

| | | ||number |

| | | || VLR-B |

| | | |+——-+

| | | | BSS-B’

| | | | |

| | | |HANDOVER |

| | | |——–>|

| | | |REQUEST |

| | | |

Figure 16: Signalling for Subsequent Inter-MSC Handover to third MSC (MSC-B’) initiation

Possible Positive outcomes

a) successful radio resources allocation:

BSS-A MSC-B MSC-A MSC-B’

| | | |

| | | | BSS-B’

| | | | |

| | | |HANDOVER |

| | | |<——–|

| | | |REQUEST |

| | | ACKNOWLEDGE

| | | | |

| | |MAP PREPARE HANDOVER |

| | |<—————| |

| |MAP PREPARE SUBSEQUENT| response | |

| |<———————| | |

| |HANDOVER response | | |

| HANDOVER | | | |

|<———–| | | |

| COMMAND | | | |

| | | | |

b) radio resources allocation queued and successful handover number allocation, if performed. Later successful radio resources allocation indication:

BSS-A MSC-B MSC-A MSC-B’

| | | |

| | | | BSS-B’

| | | | |

| | | | QUEUING |

| | | |<——–|

| | | |INDICAT. |

| | | | |

| | |MAP PREPARE HANDOVER |

| | |<—————| |

| |MAP PREPARE SUBSEQUENT| response | |

| |<———————| | |

| |HANDOVER response | | |

| | | |HANDOVER |

| | | |<——–|

| | | |REQUEST |

| | | ACKNOWLEDGE

| | | | |

| | |MAP PROCESS ACCESS |

| | |<—————| |

| |MAP FORWARD ACCESS |SIGNALLING request |

| |<———————| | |

| |SIGNALLING request | | |

| HANDOVER | | | |

|<———–| | | |

| COMMAND | | | |

Figure 17: Signalling for Subsequent Inter-MSC Handover to third MSC (MSC-B’) execution
(Positive outcome)

Possible Negative outcomes

c) user error detected, or component rejection or dialogue abortion performed by MSC-B’:

BSS-A MSC-B MSC-A MSC-B’

| | | |

| | | | BSS-B’

| | |MAP PREPARE HANDOVER |

| | |response negative result |

| | |MAP CLOSE | |

| | |<—————| |

| | |MAP U/P -ABORT | |

| |MAP PREPARE SUBSEQUENT| | |

| |<———————| | |

| |HANDOVER response negative | |

| HANDOVER |result | | |

|<———–| | | |

| REQUIRED | | | |

| REJECT | | | |

| (Note 1) | | | |

d) radio resources allocation failure:

BSS-A MSC-B MSC-A MSC-B’

| | | |

| | | | BSS-B’

| | | | |

| | | |HANDOVER |

| | | |<——–|

| | | |FAILURE |

| | | | |

| | |MAP PREPARE HANDOVER |

| | |<—————| |

| |MAP PREPARE SUBSEQUENT| response | |

| |<———————| | |

| |HANDOVER response | | |

| HANDOVER | | | |

|<———–| | | |

| REQUIRED | | | |

| REJECT | | | |

| (Note 1) | | | |

e) radio resources allocation queued and successful handover number allocation (if performed). Later unsuccessful radio resources allocation:

BSS-A MSC-B MSC-A MSC-B’

| | | |

| | | | BSS-B’

| | | | |

| | | | QUEUING |

| | | |<——–|

| | | |INDICAT. |

| | | | |

| | |MAP PREPARE HANDOVER |

| | |<—————| |

| |MAP PREPARE SUBSEQUENT| response | |

| |<———————| | |

| |HANDOVER response | | |

| | | |HANDOVER |

| | | |<——–|

| | | |FAILURE |

| | | | |

| | |MAP PROCESS ACCESS |

| | |<—————| |

| | |SIGNALLING request |

| |MAP FORWARD ACCESS | | |

| |<———————| | |

| |SIGNALLING request | | |

| HANDOVER | | | |

|<———–| | | |

| REQUIRED | | | |

| REJECT | | | |

| (Note 1) | | | |

Figure 18: Signalling for Subsequent Inter-MSC Handover to third MSC (MSC-B’) execution (Negative outcome)

NOTE 1: Possible rejection of the handover because of the negative outcome of MAP or BSSMAP procedure.

Positive outcome

BSS-A MSC-B MSC-A MSC-B’

| | | |

| | | | BSS-B’

| | | | |

| | | |HANDOVER |

| | | |<——–|

| | | |COMPLETE |

| | | | |

| | |MAP SEND END SIGNAL |

| | |<—————| |

| | MAP SEND END SIGNAL | | |

| |<———————| | |

| | response | | |

| CLEAR | | | |

|<———–| | | |

| COMMAND | | | |

Figure 19: Signalling for Subsequent Inter-MSC Handover to third MSC (MSC-B’) completion (Successful completion of the procedure)

Negative outcome

BSS-A MSC-B MSC-A MSC-B’

| | | |

|HANDOVER | | | BSS-B’

|———–>| | | |

|FAILURE |MAP PROCESS ACCESS | | |

| |———————>| | |

| |SIGNALLING request (Note 1) | |

| | | | |

| | |MAP U -ABORT | |

| | |—————>| |

| | | |CLEAR |

| | | |——–>|

| | | |COMMAND |

| | | | |

Figure 20: Signalling for Subsequent Inter-MSC Handover to third MSC (MSC-B’) completion (Unsuccessful completion of the procedure)

NOTE 1: Specific interworking case detailed below.

The specific interworking case in MSC-A compared to the subclauses 4.5.1 and 4.5.2 occurs between HANDOVER FAILURE encapsulated in a Process Access Signalling from MSC-B and the abortion of the dialogue with MSC-B’ in the case of a reversion to old channel of the MS:

—————————————————————-

| 09.02 09.02 |Notes

——–┼————————————————-┼—–

Forward | MAP PROCESS-SIGNALLING |

message | request |

| |

| -bss-APDU( MAP U -ABORT | 1

| HANDOVER FAILURE) |

| |

——–┼————————————————-┼—–

Positive| |

result | |

——–┼————————————————-┼—–

Negative| |

result | MAP U/P -ABORT | 2

| |

NOTE 1: The abortion of the dialogue triggers in MSC-B’ the clearing of the circuit connection with MSC-A, if any, and of the Resources between MSC-B’ and BSS-B’.The abortion of the dialogue ends the handover procedure with MSC-B’.

NOTE 2: The abortion of the dialogue ends the handover procedure with MSC-B.

4.5.4 BSSAP Messages transfer on E-Interface

The following mapping applies to the encapsulation performed in MSC-A.

—————————————————————-

| 04.08/08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward | BSSAP messages MAP FORWARD ACCESS SIGNALLING|

message | request | 1

| |

| -bss-APDU (BSSAP messages)|

——–┼————————————————-┼—–

Positive| |

result | | 2

——–┼————————————————-┼—–

Negative| |

result | MAP CLOSE |

| MAP U/P -ABORT |

| |

NOTE 1: Complete BSSAP messages to be sent on MSC-B – BSS-B interface (BSSMAP or DTAP messages) are embedded into the bss-APDU parameter (see Annex A of GSM 08.08 for the description of the set of BSSMAP messages).

NOTE 2: The Return Result does not apply. If MSC-B returns a message, this message will arrive in an Invoke: Process Access Signalling.

The following mapping applies to the encapsulation performed in MSC-B.

—————————————————————-

| 04.08/08.08 09.02 |Notes

——–┼————————————————-┼—–

Forward | BSSAP messages MAP PROCESS ACCESS SIGNALLING|

message | request | 1

| |

| -bss-APDU (BSSAP messages)|

——–┼————————————————-┼—–

Positive| |

result | | 2

——–┼————————————————-┼—–

Negative| |

result | MAP CLOSE |

| CLEAR COMMAND |

| |

| equipment failure MAP U/P -ABORT | 3

| |

NOTE 1: Complete BSSAP messages to be sent to MSC-A (BSSMAP or DTAP messages) are embedded into the bss-APDU parameter (see GSM 09.08 for the description of the set of BSSMAP messages).

NOTE 2: The Return Result does not apply. If MSC-A returns a message, this message will arrive in an Invoke: Forward Access Signalling.

NOTE 3: The abortion of the dialogue triggers the clearing of the circuit connection with MSC-A, if any, of the Radio Resources on the A-Interface and the release of the SCCP connection between MSC-B and BSS-B. The clearing of the Radio Resources (the clearing indication received from BSS-B is transmitted to MSC-A) or the loss of the SCCP connection between MSC-B and BSS-B, triggers in MSC-B the abortion of the dialogue on the E-Interface and the clearing of the circuit connection with MSC-A, if any.

4.5.5 Processing in MSC-B, and information transfer on E-interface

The following parameters require processing (e.g. to store the parameter, to internally generate the parameter) in MSC-B. The relevant BSSMAP procedures are mentioned to ease the comprehension, their detailed description is the scope of the GSM 08.08. Each BSSMAP message listed in GSM 09.08 being transferred on E-interface shall use the mechanisms given in subclause 4.5.4 and is described in GSM 08.08.

4.5.5.1 Encryption Information

A sequence of possible encryption algorithms can be sent to a BSS in Cipher Mode Command or Handover Request. The BSS chooses one of the listed algorithms and reports this back to the MSC in Cipher Mode Complete or Handover Request Acknowledge respectively.

The list of algorithms, the ciphering key and the chosen algorithm shall be stored by MSC-B, and the chosen value sent to MSC-A.

Transfer of Information

If ciphering has not been performed before Inter-MSC Handover, this will be controlled by MSC-A after the completion of Inter-MSC Handover.

Ciphering control towards MSC-B:

If Ciphering has been performed before Inter-MSC Handover:

– in the Handover Request BSSMAP message (information included)

The Handover Request Acknowledge should in this case contain the indication of the chosen algorithm.

If Ciphering has NOT been performed before Inter-MSC Handover:

– in the Cipher Mode Command procedure between MSC-A and MSC-B.

If the encryption algorithm is changed at an intra-BSS handover in BSS-B this must be reported to MSC-A in:

– the BSSMAP Handover Performed procedure.

If the encryption algorithm is changed at an intra-MSC handover in MSC-B this must be reported to MSC-A in:

– the BSSMAP Handover Performed procedure which shall be initiated by MSC-B on reception from BSS-B of the Handover Complete message (the information being previously received in the Handover Request Acknowledge message).

Note also that the chosen encryption value may be contained in the BSSMAP Assignment Complete message. This may happen if the encryption value changes e.g. at a second assignment during a call (e.g. from TCH to SDCCH).

4.5.5.2 Channel Type

Assignment Request and Handover Request (BSSMAP) may give the BSS a choice, in the same way as the Encryption Algorithm above. Depending on the Channel Type Info, the chosen channel may have impact on subsequent handovers, internal in MSC-B and inter-MSC controlled by MSC-A. Some values in channel Type Info indicate that if a particular channel once has been chosen, the same type must be used for the rest of the call.

The Channel Type, and the characteristics of the chosen channel shall be stored by MSC-B, and the Chosen Channel and/or Speech Version information elements transferred to MSC-A.

Transfer of Information

Independently of the type of resource (Signalling only (e.g. SDCCH) or TCH) assigned to the MS, the Channel Type Information is transferred to MSC-B in:

– the Handover Request BSSMAP message, and the Chosen Channel and/or Speech Version should be reported back to MSC-A in the Handover Request Acknowledge.

If a new type of resource is to be assigned after Inter-MSC Handover, this can be made with:

– the BSSMAP Assignment procedure between MSC-A and MSC-B (Chosen Channel and/or Speech Version in Assignment Complete).

If the Channel Type (the chosen channel and/or chosen speech version) is changed at an intra-BSS handover in BSS-B this must be reported to MSC-A in:

– the BSSMAP Handover Performed procedure.

If the Channel Type (the chosen channel or chosen speech version) is changed at an intra-MSC handover in MSC-B this must be reported to MSC-A in:

– the BSSMAP Handover Performed procedure which shall be initiated by MSC-B on reception from BSS-B of the Handover Complete message (the information being previously received in the Handover Request Acknowledge message).

4.5.5.3 Classmark

This information shall be stored by MSC-B and might be received either from MSC-A, or from the MS when the MS initiates a Classmark Update.

Transfer of Information due to Classmark received from MSC-A:

This information shall be stored by MSC-B and is received:

– in the Handover Request BSSMAP message

If a new type of resource is to be assigned after Inter-MSC Handover, Classmark Information MAY be included:

– in the BSSMAP Assignment procedure

Transfer of Information, due to "Classmark Signalling Procedures"

This information shall be stored by MSC-B and can be received:

– Due to a classmark update, either requested from MSC-A (Classmark Request, Classmark Update), or an MS-Initiated Classmark Update.

This can be carried out either with:

– the BSSMAP Classmark procedure(s).

Apart from these cases there is the "odd" case where a Classmark Update can be received during an Inter-MSC Handover by MSC-B, i.e. before the MS has moved to the new channel controlled by MSC-B. This can be made with transparent transfer of BSSMAP Classmark Update.

4.5.5.4 Downlink DTX-Flag

The parameter shall be stored by MSC-B to be used at internal Handover in MSC-B.

Transfer of Information

Received by MSC-B from MSC-A in either:

If the MS has already been assigned to a TCH for speech before the Inter-MSC Handover, the DTX-flag should be sent in:

– the Handover Request BSSMAP message

(If the type of resource is not TCH for speech, the DTX-flag shall not be included).

If a new assignment to a TCH for speech after an Inter-MSC Handover is to be performed, this can be made with:

– the BSSMAP Assignment procedure.

4.5.5.5 Priority

The parameter shall be stored by MSC-B and is received according to below:

Transfer of Information

Received by MSC-B from MSC-A in:

– the Handover Request BSSMAP message

If a change is needed after an Inter-MSC Handover with:

– the BSSMAP Assignment procedure.

4.5.5.6 MSC/BSC-Invoke Trace Information Elements

The process to be performed by MSC-B on the information elements of the MSC or BSC Invoke Trace BSSMAP messages is left for further study.

4.5.6 Overview of the Technical Specifications GSM interworking for the Inter-MSC Handover

╔══════════════════════════════════════════════════════════════════════════════════════════════════╗

PSTN/ISDN

║ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ║

║ ▒ +—————+ ▒ ║

║ ==============▒====== | ============= | =============== ▒ ║

PLMN ▒ | | ▒ ║

║ ▒ v v ▒ ║

║ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ▒ ║

║ ▒ BSS-A MSC-A MSC-B BSS-BMS

║ ▒ ▒ ║

║ ▒ +——-+ ▒ +——-+ ║

║ ▒ | C M | 04.08 (Note) ▒ | C M | ║

║ ▒ +——-|<————————————>+——-| ║

║ ▒ ░░░░░░░░░░░░░░░ | M M | ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░▒ | M M | ║

║ ▒ ░+——+ 08.08 +——-| 08.08’+——-+ 08.08 +——-+ ░▒ +——-| ║

║ ▒ ░| R R |<—–>| R R |<=====>| R R |<—–>| R R | ░▒ | R R | ║

║ ▒ ░+——+ +——-+ (Note)+——-+ +——-+ ░▒ +——-+ ║

║ ▒ ░ ^ ^ ^ ^ ░▒ ║

║ ▒ ░ | | 09.10 | | ░▒ Note: Subset of 08.08 ║

║ ▒ ░ | v v | ░▒ procedures as described ║

║ ▒ ░ |+—–+ 09.02 +—–+| ░▒ in the TS GSM 08.08. ║

║ ▒ ░ ||MAP/E|<—–>|MAP/E|| ░▒ ║

║ ▒ ░ |+—–+ +—–+| 03.09░▒ ║

║ ▒ ░░░░░░░░░░░░░░░░ | ░░░░░░░░░░░░░░░░░░░ | ░░░░░░░░░░░░░░░░░░░▒ Remark: The A-bis interface and ║

║ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ v ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ v ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ the link layer ║

║ +———————–+ protocols being out of ║

║ | T C A P | the scope of this ║

║ +———————–+ Specification are not ║

║ +——————————————————+ shown here. ║

║ | S C C P | ║

║ +——————————————————+ ║

║ +——————————————————+ ║

║ | M T P | ║

║ +——————————————————+ ║

╚══════════════════════════════════════════════════════════════════════════════════════════════════╝

Annex A (informative):
Document change history

SMG#

CR

PHASE

VERS

NEW_VERS

SUBJECT

s25

A008

R97

5.2.0

6.0.0

Addition of the mapping of the Routeing area update procedure in GPRS

s26

6.0.0

6.0.1

Publication as part of R97

S29

A009

R97

6.0.1

6.1.0

GPRS ATTACH Reject cause when ‘IMSI unknown’

CN#11

A011

R97

6.1.0

6.2.0

Mapping of unknown HLR error to access interface cause code

CN#11

A013

R97

6.1.0

6.2.0

Roaming restrictions for GPRS service