C.2 MAC states

3GPP43.051GSM/EDGE Overall descriptionRelease 16Stage 2TS

This clause describes the MAC state model for GERAN in Iu mode. The model shows the MAC state for the MAC control entity of an MS and not for individual radio bearers. What characterizes the different MAC states is how new radio resource allocation is performed i.e. by MAC or RRC, using PCCCH/PACCH/PDTCH or FACCH/SDCCH.

Figure C-2. States of the MAC Control Entity

C.2.1 MAC-Dedicated state

The MAC Control entity will be in MAC-Dedicated state when RRC is in RRC-Cell_Dedicated state and a dedicated basic physical subchannel is used and no shared basic physical subchannel is established. In MAC-Dedicated state MAC has no control functionality.

C.2.1.1 Transition from MAC-Dedicated state to MAC-Idle state

The transition occurs when the last dedicated basic physical subchannel is released.

C.2.1.2 Transition from MAC-Dedicated state to MAC-Shared state

This transition is FFS.

C.2.1.3 Transition from MAC-Dedicated state to MAC-DTM state

The transition occurs when a first TBF on shared basic physical subchannel(s) is established. The establishment of the TBF is handled by RRC.

C.2.2 MAC-Shared state

The MAC control entity is in MAC-Shared state when at least one TBF is ongoing but no dedicated basic physical subchannels have been allocated. The corresponding RRC state is RRC-Cell_Shared state.

C.2.2.1 Transition from MAC-Shared state to MAC-DTM state

The transition occurs when the first dedicated basic physical subchannel is set up while maintaining at least one of the ongoing TBFs on shared basic physical subchannel(s).

C.2.2.2 Transition from MAC-Shared state to MAC-Idle state

The transition occurs when all TBFs are released.

C.2.2.3 Transition from MAC-Shared state to MAC-Dedicated state

The transition occurs when the first dedicated channel is set up (on the same cell or a different cell) for the MS. TBFs from the shared mode are released at transition to dedicated mode. This transition is FFS.

C.2.3 MAC-Idle state

The MAC control entity of an MS is in MAC-Idle state when there are no dedicated or shared basic physical subchannels. RRC can be in RRC-Cell_Shared state, RRC-GRA_PCH state or RRC-Idle mode. In this state, the MS camps on the PCCCH.

C.2.3.1 Transition from MAC-Idle state to MAC-Dedicated state

The transition occurs when the first dedicated basic physical subchannel is established. This transition is FFS.

C.2.3.2 Transition from MAC-IDLE state to MAC-SHARED state

The transition occurs when the first TBF on shared basic physical subchannel(s) is established.

C.2.4 MAC-DTM state

The MAC control entity of an MS is in this state when it has one or more dedicated basic physical subchannel(s) and one or more shared basic physical subchannel(s) allocated. The corresponding RRC state is RRC-Cell_Dedicated state.

C.2.4.1 Transition from MAC-DTM state to MAC‑Dedicated state

This transition occurs when the last shared basic physical subchannel is released.

C.2.4.2 Transition from MAC-DTM state to MAC-Shared state

This transition occurs when the last dedicated basic physical subchannel is released.