8.1 Base station system network functions
8.1.3 Testing of the BSSMAP and RR functions
8.1.3.18 Blocking
8.1.3.18.1 Single circuit blocking
The assignment procedure depends upon the MSC choosing the terrestrial resource to be used. The MSC therefore needs to be informed of any terrestrial circuits that are out of service in the Base Station System. This is obtained by a simple block/unblock procedure. A block/unblock message is sent from the BSS to the MSC and concerns a single terrestrial circuit.
8.1.3.18.1.1 Normal Case Test Purpose
To verify the Blocking procedure in the normal case.
Test Case Initial Setup
With an O&M-message as defined by the operator or the manufacturer on the OMC-interface the BSS shall be instructed to set the timer T1 to an appropriate value B.
Description
1. With an O&M-message as defined by the operator or the manufacturer on the OMC-interface the BSS shall be commanded to block the terrestrial circuit A.
When a BLOCK message occurs on the MSC-interface, a BLOCK ACKNOWLEDGE message shall be input within a period T1=B on the MSC-interface. The response on any interface shall be recorded.
2. A dedicated resource shall be established between the radio interface and the MSC-interface.
An ASSIGNMENT REQUEST message, shall be input on the MSC-interface allocating the terrestrial circuit A. The response on any interface shall be recorded.
Message flow
MS BSS MSC BLOCK (CIC A)
- --->
T1 BLOCKING ACK (CIC A) - ASS REQ (CIC A) ASS FAIL
(Cause = Terrestrial Resource unavailable) --->
BLOCK (CIC A)
--->
The messages from the BSSTE will be:
1. O&M MESSAGES1. BLOCKING ACKNOWLEDGE, coded as specified in GSM 08.08 [10], 3.2.1.5, with:
CIC = terrestrial circuit A.
2. ASSIGNMENT REQUEST, coded as specified in GSM 08.08 [10], 3.2.1.1., with:
CIC = terrestrial circuit A.
Conformance Requirements
In step 1, a single BLOCK message shall occur for terrestrial circuit A on the MSC-interface. After the BLOCKING ACKNOWLEDGE no further BLOCK messages shall occur.
In step 2, an ASSIGNMENT FAILURE message followed by a single BLOCK message with the cause value "O&M intervention" for terrestrial circuit A shall occur on the MSC-interface.
The messages from the BSS shall be:
1. BLOCK, coded as specified in GSM 08.08 [10], 3.2.1.4, with:
CIC = terrestrial circuit A.
Cause = "O&M intervention".
2. ASSIGNMENT FAILURE, coded as specified in GSM 08.08 [10], 3.2.1.3, with:
Cause = "requested terrestrial resource unavailable"
BLOCK, coded as specified in GSM 08.08 [10], 3.2.1.4, with:
CIC = terrestrial circuit A.
Cause = "O&M intervention".
Requirement reference
GSM 08.08 [10], 3.1.2, 3.1.1.3
8.1.3.18.1.2 Blocking a terrestrial circuit already used on a call Test Purpose
To verify that the BSS does not release a call when the allocated terrestrial circuit is blocked on the OMC.
Test Case Initial Setup
With an O&M-message as defined by the operator or the manufacturer on the OMC-interface the BSS shall be instructed to set the timer T1 to an appropriate value B.
A call shall be set up between the radio interface and the MSC-interface using an appropriate terrestrial circuit A.
Description
1. With an O&M-message as defined by the operator or the manufacturer on the OMC-interface the BSS shall be commanded to block the terrestrial circuit A. The response on any interface shall be recorded.
2. The call on the terrestrial circuit A shall be cleared. The response on any interface shall be recorded. No further messages shall be input on the MSC-interface.
3. A dedicated resource shall be established between the radio interface and the MSC-interface.
An ASSIGNMENT REQUEST message, shall be input on the MSC-interface allocating the terrestrial circuit A. The response on any interface shall be recorded.
Message flow
MS BSS MSC BLOCK (CIC A)
- --->
T1 BLOCK (CIC A)
- --->
ASS REQ (CIC A) ASS FAIL
(Cause = Terrestrial Resource unavailable) --->
BLOCK (CIC A)
- --->
The messages from the BSSTE will be:
1. O&M MESSAGES
3. ASSIGNMENT REQUEST, coded as specified in GSM 08.08 [10], 3.2.1.1., with:
CIC = terrestrial circuit A.
Conformance Requirements
In step 1, 2 BLOCK messages with an interval of T1=B between them for terrestrial circuit A shall occur on the MSC-interface. The call shall continue.
In step 2, no BLOCK message shall occur at the MSC-interface, after the call has been cleared.
In step 3, an ASSIGNMENT FAILURE message followed by a BLOCK message for terrestrial circuit A shall occur on the MSC-interface.
The messages from the BSS shall be:
1. BLOCK, coded as specified in GSM 08.08 [10], 3.2.1.4, with:
CIC = terrestrial circuit A.
Cause = "O&M intervention"
3. ASSIGNMENT FAILURE, coded as specified in GSM 08.08 [10], 3.2.1.3, with:
Cause = "requested terrestrial resource unavailable"
BLOCK, coded as specified in GSM 08.08 [10], 3.2.1.4, with:
CIC = terrestrial circuit A.
Cause = "O&M intervention"
Requirement reference
GSM 08.08 [10], 3.1.2, 3.1.1.3.
8.1.3.18.1.3 No response to the Unblocking message Test Purpose
To verify that the BSS will repeat a second time the UNBLOCK message in case an UNBLOCK ACKNOWLEDGE message is not received before T1 expiry.
The test shall also check that, whatever the outcome of possible repetitions, the concerned terrestrial circuit remain "unblocked".
NOTE: The situation may be reflected to the OMC which shall resolve the possible conflict.
Test Case Initial Setup
With O&M-messages as defined by the operator or the manufacturer on the OMC-interface the BSS shall be instructed to set the timer T1 to an appropriate value B and the BSS shall be commanded to block the terrestrial circuit A.
Description
1. With an O&M-message as defined by the operator or the manufacturer from the BSSTE over the OMC-interface the BSS shall be commanded to unblock the terrestrial circuit A. The response on any interface shall be recorded.
2. A dedicated resource shall be established between the radio interface and the MSC-interface.
An ASSIGNMENT REQUEST message, shall be input on the MSC-interface allocating the terrestrial circuit A. The response on any interface shall be recorded.
Message flow
MS BSS MSC UNBLOCK (CIC A)
- --->
T1 UNBLOCK (CIC A)
- --->
ASS REQ (CIC A) ASS CMD
<---The messages from the BSSTE will be:
1. O&M MESSAGES
2. ASSIGNMENT REQUEST, coded as specified in GSM 08.08 [10], 3.2.1.1., with:
CIC = terrestrial circuit A.
Conformance Requirements
In step 1, 2 UNBLOCK messages, with an interval of T1=B between them for terrestrial circuit A shall occur on the MSC-interface.
In step 2, an ASSIGNMENT COMMAND message shall occur on the radio interface on the main signalling link.
The messages from the BSS shall be:
1. UNBLOCK, coded as specified in GSM 08.08 [10], 3.2.1.6 with:
CIC = terrestrial circuit A.
2. ASSIGNMENT COMMAND, coded as specified in GSM 04.08 [4], 9.1.2.
Requirement reference GSM 08.08 [10], 3.1.2.2
8.1.3.18.1.4 Unblocking, Normal case Test Purpose
To verify that the BSS can allocate a terrestrial circuit after having received the Unblocking Acknowledge message from the MSC.
Test Case Initial Setup
With O&M-messages as defined by the operator or the manufacturer on the OMC-interface the BSS shall be instructed to set the timer T1 to an appropriate value B and the BSS shall be commanded to block the terrestrial circuit A.
Description
1. With an O&M-message as defined by the operator or the manufacturer from the BSSTE over the OMC-interface the BSS shall be commanded to unblock the terrestrial circuit A. Then an UNBLOCKING ACKNOWLEDGE message input on the MSC-interface within a time T1=B for the terrestrial circuit A. The response on any interface shall be recorded.
2. A dedicated resource shall be established between the radio interface and the MSC-interface.
An ASSIGNMENT REQUEST message, shall be input on the MSC-interface allocating the terrestrial circuit A. The response on any interface shall be recorded.
Message flow
MS BSS MSC UNBLOCK (CIC A)
- --->
T1 UNBLOCKING ACK (CIC A) - ASS REQ (CIC A) ASS CMD
<---The messages from the BSSTE will be:
1. O&M MESSAGES
UNBLOCKING ACKNOWLEDGE, coded as specified in GSM 08.08 [10], 3.2.1.7, with:
CIC = terrestrial circuit A.
2. ASSIGNMENT REQUEST, coded as specified in GSM 08.08 [10], 3.2.1.1., with:
CIC = terrestrial circuit A.
Conformance Requirements
In step 1, a single UNBLOCK message shall occur for terrestrial circuit A on the MSC-interface. After the UNBLOCKING ACKNOWLEDGE no further UNBLOCK messages shall occur.
In step 2, an ASSIGNMENT COMMAND message shall occur on the radio interface on the main signalling link.
The messages from the BSS shall be:
1. UNBLOCK, coded as specified in GSM 08.08 [10], 3.2.1.6, with:
CIC = terrestrial circuit A.
2. ASSIGNMENT COMMAND, coded as specified in GSM 04.08 [4], 9.1.2.
Requirement reference GSM 04.08 [4], 3.4.3 GSM 08.08 [10], 3.1.2
8.1.3.18.1.5 MSC Reset during Blocking procedure Test Purpose
To verify the BSS behaviour when the MSC answers by a Reset message to the Blocking message.
Test Case Initial Setup
With an O&M-message as defined by the operator or the manufacturer on the OMC-interface the BSS shall be instructed to set the timer T1 to an appropriate value B.
Description
1. With an O&M-message as defined by the operator or the manufacturer on the OMC-interface the BSS shall be commanded to block the terrestrial circuit A.
When a BLOCK message occurs on the MSC-interface, a RESET message shall be input within a period T1=B on the MSC-interface. The response on any interface shall be recorded.
Message flow
MS BSS MSC BLOCK (CIC A)
- --->
| RESET
- | | T1 BLOCK (CIC A)
| - --->
T2
| RESET ACK
- --->
The messages from the BSSTE will be:
1. O&M MESSAGES
RESET, coded as specified in GSM 08.08 [10], 3.2.1.23 Conformance Requirements
In step 1, 2 BLOCK messages shall occur on the MSC-interface concerning the terrestrial circuit A. After some seconds, given by the timer T2, after the input RESET message a RESET ACKNOWLEDGE message shall occur on the MSC-interface. Then no further BLOCK messages shall occur. See also subclause 8.1.3.20 in this specification (reset).
The messages from the BSS shall be:
1. BLOCK, coded as specified in GSM 08.08 [10], 3.2.1.4, with:
CIC = terrestrial circuit A.
Cause: "O&M intervention".
RESET ACKNOWLEDGE, coded as specified in GSM 08.08 [10], 3.2.1.24.
Requirement reference
GSM 08.08 [10], 3.1.2 & 3.1.4.1.2 8.1.3.18.2 Circuit group blocking
8.1.3.18.2.1 Circuit group block - Normal case Test Purpose
Test the BSS capability to proceed the CIRCUIT GROUP BLOCK procedure.
Test Case Initial Setup
With O&M-messages as defined by the operator or the manufacturer on the OMC-interface the BSS shall be instructed to set the timer T20 to an appropriate value B.
Description
1. With an O&M message, the BSS shall be commanded to block a group of terrestrial circuits. The response on any interface shall be recorded.
2. The BSSTE sends a CIRCUIT GROUP BLOCKING ACKNOWLEDGE message within a period T2=B. The response on any interface shall be recorded.
Message Flow
MS BSS MSC O&M block a group of terrestrial circuits
CIRCUIT GROUP BLOCK --->
CIRCUIT GROUP BLOCK ACK
<---The messages from the BSSTE will be:
2. CIRCUIT GROUP BLOCKING ACKNOWLEDGE - GSM 08.08 [10], 3.2.1.42 Circuit Identity Code
Circuit Identity Code List Conformance Requirements
In case of step 1 the BSS sends a CIRCUIT GROUP BLOCKING message with cause: "O&M intervention".
In case of step 2 no further messages are expected.
The messages from the BSS will be:
1. CIRCUIT GROUP BLOCKING - GSM 08.08 [10], 3.2.1.41 Cause = "O&M intervention"
Circuit Identity Code Circuit Identity Code List Requirement reference
GSM 08.08 [10], 3.1.2
8.1.3.18.2.2 Circuit group unblock - Normal case Test Purpose
Test the BSS capability to proceed the CIRCUIT GROUP UNBLOCK Procedure.
Test Case Initial Setup
With an O&M message, the BSS shall be commanded to block a group of terrestrial circuits.
Description
1. The blocked group of terrestrial circuits shall be unblocked with an O&M message. The response on any interface shall be recorded.
2. The BSSTE sends a CIRCUIT GROUP UNBLOCKING ACKNOWLEDGE message. The response on any interface shall be recorded.
Message Flow
MS BSS MSC
O&M block and then unblock the same group of terrestrial circuits
CIRCUIT GROUP UNBLOCK
--->
CIRCUIT GROUP UNBLOCK ACK
<---The messages from the BSSTE will be:
2. CIRCUIT GROUP UNBLOCKING ACKNOWLEDGE - GSM 08.08 [10], 3.2.1.44 Circuit Identity Code
Circuit Identity Code List Conformance Requirements
In case of step 1 the BSS sends a CIRCUIT GROUP UNBLOCKING message relating to the concerned group of terrestrial circuits.
In case of step 2 no further messages are expected.
The messages from the BSS will be:
1. CIRCUIT GROUP UNBLOCKING - GSM 08.08 [10], 3.2.1.43 Circuit Identity Code
Circuit Identity Code List Requirement reference
GSM 08.08 [10], 3.1.2
8.1.3.19 Resource indication