name: SACCH
full_form: Slow Associated Control CHannel
context: The logical control channels are defined in 3GPP TS 45.002[ None ]  [32]. In the following those control channels are considered which carry signalling information or specific types of user packet information: i) Broadcast Control CHannel (BCCH): downlink only, used to broadcast Cell specific information; ii) Synchronization CHannel (SCH): downlink only, used to broadcast synchronization and BSS identification information; iii) Paging CHannel (PCH): downlink only, used to send page requests to Mobile Stations (MSs); iv) Random Access CHannel (RACH): uplink only, used to request a Dedicated Control CHannel; v) Access Grant CHannel (AGCH): downlink only, used to allocate a Dedicated Control CHannel; vi) Standalone Dedicated Control CHannel (SDCCH): bi-directional; vii) Fast Associated Control CHannel (FACCH): bi-directional, associated with a Traffic CHannel; viii) Slow Associated Control CHannel (SACCH): bi-directional, associated with a SDCCH or a Traffic CHannel; ix) Cell Broadcast CHannel (CBCH): downlink only used for general (not point to point) short message information; x) Notification CHannel (NCH): downlink only, used to notify mobile stations of VBS (Voice Broadcast Service) calls or VGCS (Voice Group Call Service) calls. Two service access points are defined on signalling layer 2 which are discriminated by their Service Access Point Identifiers (SAPI) (see 3GPP TS 44.006[ None ]  [19]): i) SAPI 0: supports the transfer of signalling information including user-user information; ii) SAPI 3: supports the transfer of user short messages. Layer 3 selects the service access point, the logical control channel and the mode of operation of layer 2 (acknowledged, unacknowledged or random access, see 3GPP TS 44.005[ None ]  [18] and 3GPP TS 44.006[ None ]  [19]) as required for each individual message.
description: The Slow Associated Control Channel (SACCH) is a bi-directional logical control channel in the GSM network, associated with either a Standalone Dedicated Control Channel (SDCCH) or a Traffic Channel. It is used for the transfer of signalling information and specific types of user packet data between the Mobile Station (MS) and the Base Station Subsystem (BSS). The SACCH plays a crucial role in managing communication sessions by providing a dedicated path for control messages, thereby ensuring efficient use of network resources.
explanation: SACCH is classified as a Channel because it serves as a specific pathway within the GSM network architecture for transmitting control and signalling information between network elements. This classification aligns with the context provided in 3GPP TS 24.008, which outlines the logical channels used in A/Gb mode.
section_title: 1.5 Use of logical channels in A/Gb mode
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