20.7 Priority of cells
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
20.7.1 Definition
In general, cell prioritization is a means of encouraging MSs to select some suitable cells in preference to others.
20.7.2 Conformance requirement
1. During cell selection a cell with low priority indication will only be selected if a suitable cell of normal priority cannot be found; 3GPP TS 03.22, subclause 3.5.2.1.
2.
Table 1a: Parameters affecting cell priority for cell selection
CELL_BAR_QUALIFY |
CELL_BAR_ACCESS |
Cell selection priority |
Status for cell reselection |
0 |
0 |
normal |
normal |
0 |
1 |
barred |
barred |
1 |
0 |
low |
normal (see note 2) |
1 |
1 |
low |
normal (see note 2) |
3GPP TS 05.08, table 1.a.
3. If all the following conditions are met then the "Cell selection priority" and the "Status for cell reselection" shall be set to normal:
– the cell belongs to the MS HPLMN;
– the MS is in cell test operation mode;
– the CELL_BAR_ACCESS is set to "1";
– the CELL_BAR_QUALIFY is set to "0";
– the Access Control class 15 is barred.
3GPP TS 05.08, table 1.a.
20.7.3 Test purpose
1. To verify that the MS does not select a cell of low priority when a suitable cell of normal priority exists with a lower received signal strength.
2. To verify that the MS takes into account CELL_BAR_ACCESS and CELL BAR _QUALIFY when performing cell selection and reselection.
3. To verify that the MS meets conformance requirement 3.
20.7.4 Method of test
20.7.4.1 Initial conditions
Parameters changed from Default values table 20.1
Parameter |
Carrier 1 |
Carrier 2 |
Carrier 3 |
Carrier 4 |
Carrier 5 |
Carrier 6 |
RF Signal Level |
||||||
(dBV emf() / dBm) |
33 / -80 |
43 / -70 |
33 / -80 |
23 / -90 |
OFF |
OFF |
RXLEV_ACCESS_MIN |
||||||
(dBV emf() / dBm) |
3 / -110 |
23 / -90 |
13 / -100 |
13 / -100 |
||
CBA |
0 |
1 |
1 |
0 |
||
CBQ |
1 |
1 |
0 |
0 |
||
Access class 15 |
barred |
barred |
barred |
barred |
||
C1 |
30 |
20 |
20 |
10 |
20.7.4.2 Procedure
a) The SS activates the carriers and monitors for RA requests from the MS on carriers 1, 2, and 4.
b) The MS is switched on.
c) The MS is switched off. The SS deactivates the carriers.
d) The MS is placed in cell test operation mode.
NOTE: Cell test mode is a mode of operation defined in SIM administrative data field.
e) The SS activates the carriers and monitors for RA requests from the MS on carriers 1, 2, and 3.
f) The MS is switched on.
20.7.5 Test requirements
1) After step b), the first response from the MS shall be on carrier 4 within 33 s, followed by a response on carrier 1 before a response (if any) on carrier 2 within 50 s.
2) After step f), the first response from the MS shall be on carrier 3 within 33 s, followed by a response on carrier 1 before a response (if any) on carrier 2 within 50 s.