8.2 Packet PDCH Release

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

The network may broadcast the PACKET PDCH RELEASE message on PACCH to indicate one or more timeslots is no longer available for packet data service. In the case where any of these timeslots belong to an assigned PDCH pair for a TBF in RTTI configuration, the mobile stations that use any of these time slots within their assigned TBF(s) in RTTI configuration shall consider both timeslots that constitute such a PDCH pair as being released. When a mobile station receives a PACKET PDCH RELEASE message, it shall immediately stop transmitting and receiving on all assigned PDCHs, which are indicated as not present in the TIMESLOTS_AVAILABLE field, remove those PDCHs from its list of assigned PDCHs.

If all of the mobile station’s assigned PDCHs are removed from its list of assigned PDCHs, and, if at least one uplink TBF was in progress, the mobile station shall perform an abnormal release with access retry (see sub-clause 8.7.2). If no uplink TBFs were in progress, the mobile station shall perform an abnormal release without retry (see sub-clause 8.7.1).

If the mobile station has been assigned an uplink control timeslot(s) and the PACKET PDCH RELEASE message releases this PDCH/PDCH pair, and if at least one uplink TBF was in progress, the mobile station shall perform an abnormal release with access retry (see sub-clause 8.7.2). If no uplink TBFs were in progress, the mobile station shall perform an abnormal release without retry (see sub-clause 8.7.1).

If the current timeslot configuration requires Shifted USF operation (see sub-clause 8.1.1.2.4) and the PACKET PDCH RELEASE message modifies the configuration in such a way that Shifted USF operation is no longer required then normal USF operation shall apply after a suitable reaction time as defined in 3GPP TS 45.010.