name: CSS
full_form: Client Security Service
context: all RBs of the MBS frequency resource, and if the UE is provided searchSpaceMCCH or searchSpaceMTCH for Type0B-PDCCH CSS set on the primary cell or for Type3-PDCCH CSS set on a secondary cell, the UE monitors PDCCH for detection of broadcast DCI formats, as described in clause 18, on the active DL BWP. For a DL BWP, if a UE is not provided searchSpaceOtherSystemInformation for Type0A-PDCCH CSS set, the UE does not monitor PDCCH for Type0A-PDCCH CSS set on the DL BWP. The CCE aggregation levels and the number of PDCCH candidates per CCE aggregation level for Type0A-PDCCH CSS set are given in Table 10.1-1. For a DL BWP, if a UE is not provided ra-SearchSpace for Type1-PDCCH CSS set, the UE does not monitor PDCCH for Type1-PDCCH CSS set on the DL BWP. If the UE has not been provided a Type3-PDCCH CSS set, or a Type1A-PDCCH CSS set, or a USS set and the UE has received a C-RNTI and has been provided a Type1-PDCCH CSS set, the UE monitors PDCCH candidates for DCI format 0_0 and DCI format
description: CSS (Client Security Service) is a parameter related to the configuration of physical downlink control channel assignment in the context of 5G networks. It is used to determine the search space for PDCCH (Physical Downlink Control Channel) monitoring by the UE (User Equipment). The CSS set is provided to the UE through higher layer signaling and affects how the UE monitors PDCCH candidates on the downlink bandwidth part (DL BWP).
explanation: The context explicitly mentions 'CSS set' in relation to the configuration of PDCCH monitoring by the UE, indicating that it is a parameter used for network operation. The detailed description of its role in determining search spaces and monitoring PDCCH candidates further supports this classification.
section_title: 10.1UE procedure for determining physical downlink control channel assignment
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