name: PCH
full_form: Paging 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 Paging Channel (PCH) is a downlink-only logical control channel used to send page requests to Mobile Stations (MSs). It plays a crucial role in the process of locating and connecting with mobile devices, enabling the network to efficiently manage communication sessions.
explanation: PCH is classified as a Channel because it serves as a specific path for data transmission, in this case, for sending page requests from the network to mobile stations. This aligns with the context provided from 3GPP TS 24.008, which outlines the use of logical channels in A/Gb mode.
section_title: 1.5 Use of logical channels in A/Gb mode
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biotag_Description: O,B-Connection,I-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O