name: SCCH
full_form: Synchronisation Control Channel
context: To manage and synchronise the SCI values between UTRAN and UE, the broadcast system information should contain the list of currently used SCIs. The UTRAN should continuously transmit used SCIs in one of the System Information Blocks. The UTRAN would "activate" an SCI by adding its value to the broadcast list, and "deactivate" it by deleting it. When the UE determines from the SIB contents that an SCI has been deactivated, the UE shall delete the corresponding configuration from its stored configurations. To avoid situation that, an UE has gone out of service when the SCI value was not yet invalidated, and return after the UTRAN has used same SCI again, giving no means to the UE to determine that the configuration associated with that SCI had changed. The UTRAN should wait long enough between invalidation and reuse of a given SCI that any problematic "lost" UEs will have discarded their system information (including the SCI validity information) due to the existing 6-hour timer. To
description: The Synchronisation Control Channel (SCCH) is a control channel in the 5G New Radio (NR) sidelink communication, responsible for transmitting control information related to synchronization. It is part of the control plane protocol stack in the PC5 interface and consists of RRC, PDCP, RLC, MAC, and the physical layer.
explanation: SCCH is classified as a Channel because it is a dedicated pathway for transmitting specific types of data (control information related to synchronization) within the 5G NR sidelink communication system.
section_title: 6.5.1	General
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