7 Split/Combine and Padding Functions

3GPP48.020Rate adaption on the Base Station System - Mobile-services Switching Centre (BSS - MSC) interfaceRelease 17TS

The Split/Combine-function in the IWF shall be used in cases when up to and including 4 substreams are used in A/Gb mode.

The Split/Combine-function in the BSS shall be used only when more than four substreams are used in A/Gb mode.

The Split/Combine-function is always used in the BSS if the BSS uses more than 1 substream in GERAN Iu mode.

7.1 Data Frame distribution into the channels by the Split/Combine function

Described in 3GPP TS 44.021.

7.2 Substream numbering

Described in 3GPP TS 44.021.

7.3 Initial Substream Synchronisation for Transparent Services

Described in 3GPP TS 44.021.

7.4 Frame Synchronisation and Action on loss of Synchronisation

When in the IWF, the Split/Combine function is responsible for controlling the initial frame synchronisation procedure and re-synchronisation procedure as described in 3GPP TS 29.007.

7.5 Network Independent Clocking

NIC is specified in 3GPP TS 44.021.

7.6 Padding

Padding is specified in 3GPP TS 44.021.