20.6 Cell reselection timings

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

20.6.1 Definition

void

20.6.2 Conformance requirement

1. At least every 5 s the MS shall calculate the value of C1 and C2 for the serving cell and recalculate C1 and C2 values for non serving cells (if necessary). The MS shall then check whether:

1.1 ii) The calculated value of C2 for a non‑serving suitable cell exceeds the value of C2 for the serving cell for a period of 5 s.

1.2 Cell reselection for any other reason (see 3GPP TS 03.22) shall take place immediately, but the cell that the MS was camped on shall not be returned to within 5 s if another suitable cell can be found.

3GPP TS 05.08, subclause 6.6.2.

20.6.3 Test purpose

1. To verify that:

1.1 The MS does not perform a cell reselection when the C2 value for a non serving cell does not exceed the C2 value of the serving cell for a period of at least 5 s.

1.2 When the MS performs an immediate cell reselection due to an unsuccessful random access attempt, the cell that the MS was camped onto is not returned to within 5 s when another suitable cell exists.

20.6.4 Method of test

20.6.4.1 Initial conditions

Parameters changed from the default values in table 20.1.

Parameter

Carrier 1

Carrier 2

Carrier 3

Carrier 4

Carrier 5

Carrier

RF Signal Level

(dBV emf() / dBm)

56 / -57

46 / -67

OFF

OFF

OFF

OFF

RXLEV_ACCESS_MIN (dBV emf() / dBm)

29 / -84

33 / -80

Max. Retrans

00

00

C1

27

13

C2

27

13

Below is an alternative table of parameters for use with test equipment that cannot reach the upper RF levels as specified in the table above. These carrier levels are reduced by 5 dB and will not effect the purpose of the test case.

Parameter

Carrier 1

Carrier 2

Carrier 3

Carrier 4

Carrier 5

Carrier

RF Signal Level

(dBV emf() / dBm)

51 / -62

41 / -72

OFF

OFF

OFF

OFF

RXLEV_ACCESS_MIN (dBV emf() / dBm)

24 / -89

28 / -85

Max. Retrans

00

00

C1

27

13

C2

27

13

The BA(BCCH) list only contains 5 ARFCNs including the ARFCNs of the carriers used during the test.

NOTE: With 5 ARFCNs in the BA(BCCH) list and BS_PA_MFRMS=5 (default value) the MS will maintain a running average on surrounding cells over a period of 5 s.

20.6.4.2 Procedure

a) The SS activates the channels. The MS is not paged on any of the carriers.

b) The MS is switched on.

c) After 50 s, the SS starts paging continuously on carriers 1 and 2 for 20 s. The SS monitors carriers 1 and 2 for RA requests from the MS.

d) The SS stops paging on carriers 1 and 2 and waits for 20 s. (The MS should revert to carrier 1 due to cell reselection.)

e) The SS starts paging continuously on carrier 2.

f) The SS increases the transmit level of carrier 2 by 20 dB for a period of 4 s and then reduces the level back to the original value.

g) The SS increases the transmit level of carrier 2 by 20 dB and waits for the MS to access on carrier 2.

20.6.5 Test requirements

1) In step c), the MS shall transmit 2 RA requests on carrier 1 followed by 2 RA requests on carrier 2. Subsequent RA requests on either carrier shall not occur within 4,5 s of the second RA request on that carrier.

2) In step f), there shall be no access on carrier 2 within 34 seconds of increasing the level of carrier 2.

3) After step g), the MS shall respond on carrier 2.