Reference Manual

Frequency Hopping

Supported channel numbers are:

•

Bm + ACCH

•

Lm + ACCH

•

SDCCH/8 + ACCH

This function is initiated when a CHANNEL_ACTIVATION message /

GSM:08.58:8.4.1/ is received from the BSC.

The information element Channel Identiﬁcation as deﬁned in /

GSM:08.58:9.3.5/ is ignored.

The BPC must have already been conﬁgured for frequency hopping by

the BSC (OML link). All frequency hopping parameters are deﬁned for

each BPC at conﬁguration, and cannot be changed at channel activation.

Frequency hopping is performed according to /GSM: 05.02:6.2.3/.

Frequency hopping is not supported for the BPC carrying BCCH.

Other BPCs on the BCCH frequency can be frequency hopping when

baseband hopping is used. The following conﬁguration parameters are

used for administration of frequency hopping, the parameters are used

in the frequency hopping algorithms as described in /GSM: 05.02:6.2.3/.

Table 152 Conﬁguration parameters

Parameter Supported values Description

HSN /GSM: 05.02 6.2.2/ Hopping Sequence Number

0 = cyclic hopping 1-63 = random hopping

MAIO /GSM: 05.02:6.2.2/ Mobile Allocation Index Offset

Frequency list 1-64 ﬁelds Information element to provide a list of the

ARFCNs used in a frequency hopping sequence

31.4 Operational Conditions

Both baseband and synthesizer frequency hopping are supported. A

maximum of 64 frequencies can be used in the hopping sequence.

290 (485)

EN/LZT 720 0008 P2A

2001-11-28

Preliminary