26.14 VGCS and VBS Tests
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
This clause applies to mobile station supporting Voice Group Call Service (TS 91) and/or Voice Broadcast Service (TS 92). The objective of this clause is to test VGCS/VBS concerned procedures. A specific VGCS/VBS SIM card is needed for testing. If a mobile supports both VGCS and VBS, the VGCS is selected for tests except when otherwise stated.
For VGCS and VBS, the following possible mobile station implementations exist:
– support of VBS listening;
– support of VBS originating;
– support of VGCS listening;
– support of VGCS talking. This always includes the implementation for VGCS listening;
– support of VGCS originating. This always includes the implementation for VGCS talking.
Apart from the explicitly mentioned combinations, all possible combinations are optional.
In this clause some L3 messages are sent in UI format to which no L2 acknowledgement/re-transmission mechanism is applied. It is important for overall tests in this clause to ensure that the radio conditions are ideal.
Tables 26.14.1 to 26.14.3 define generic procedures to bring the MS into an initial state. For establishment of group transmit mode table 26.14.1 is used if the MS supports VGCS talking. If an MS supporting VBS originating rather than VGCS, table 26.14.2 is used for establishment of a VBS call and to bring the MS into group transmit mode. For establishment of group receive mode table 26.14.3 is applied.
Unless indicated in individual sub-clauses, the default message contents in subclause 26.14.10 are applied.
Table 26.14.1: Establishment of group transmit mode for VGCS
Step |
Direction |
Message |
Comments |
0 |
MS |
the MS is in idle mode |
|
1 |
SS -> MS |
NOTIFICATION/NCH |
with a description of VGCS channel and a VGCS call reference active in the MS |
2 |
MS |
After the indication of the notification, MMI action to join the VGCS call |
|
3 |
SS -> MS |
UPLINK FREE |
|
4 |
MS |
MMI action to request uplink access |
|
5 |
MS -> SS |
UPLINK ACCESS |
|
6 |
MS -> SS |
UPLINK ACCESS |
|
7 |
SS -> MS |
UPLINK BUSY |
|
8 |
SS -> MS |
VGCS UPLINK GRANT |
|
9 |
MS -> SS |
TALKER INDICATION |
L2: SABM / UA |
Table 26.14.2: Establishment of a VBS call
Step |
Direction |
Message |
Comments |
0 |
MS |
the MS is in idle mode |
|
1 |
MS |
MMI action to initiate a VBS call with setup procedure. |
|
2 |
MS -> SS |
CHANNEL REQUEST |
|
3 |
SS -> MS |
IMMEDIATE ASSIGNMENT |
TCH/F, single RF channel GSM 450: 275, GSM 480: 322 GSM 900: 50, DCS 1 800: 750 PCS 1 900: 650 GSM710: 470 GSM 750: 470 T-GSM 810: 470 GSM 850: 177 |
4 |
MS -> SS |
CM SERVICE REQUEST |
VBS establishment, L2: SABM / UA |
5 |
SS -> MS |
CM SERVICE ACCEPT |
|
6 |
MS -> SS |
SETUP |
|
7 |
SS -> MS |
CHANNEL MODE MODIFY |
|
8 |
MS -> SS |
CHANNEL MODE MODIFY ACKNOWLEDGE |
|
9 |
SS -> MS |
CONNECT |
Table 26.14.3: Establishment of group receive mode for VGCS or VBS
Step |
Direction |
Message |
Comments |
0 |
MS |
the MS is in idle mode |
|
1 |
SS -> MS |
NOTIFICATION/NCH |
with a description of VGCS/VBS channel and a VGCS/VBS call reference active in the MS, for VGCS call the SF set to ‘1’, for VBS call the SF set to ‘0’ |
2 |
MS |
After the indication of the notification, MMI action to join the VGCS/VBS call |