name: TSS
full_form: Target Security Service
context: The signaling flow for RAN TSS reporting towards the CN is shown in Figure 8.24.1-1. This procedure is used when the TSCTSF subscribes to RAN TSS reporting at the AMF as described in TS 23.502 [32]. Figure 8.24.1-1: RAN TSS reporting towards the CN 0. The gNB-DU is pre-configured with a threshold for each RAN TSS attribute it supports. The gNB-DU does not report RAN TSS attribute values better than the pre-configured thresholds, i.e. if a RAN TSS attribute has a value better than the pre-configured threshold, the gNB-DU reports the threshold value to the gNB-CU instead. NOTE 1: It is assumed the pre-configured thresholds in the gNB-DU are sufficient to meet UE time sync performance requirement which are configured by the operator. 1. The AMF requests RAN TSS reporting by sending the TIMING SYNCHRONISATION STATUS REQUEST message to the gNB-CU. 2. The gNB-CU requests RAN TSS reporting from at least one gNB-DU by sending the TIMING SYNCHRONISATION STATUS REQUEST message to the gNB-DU.
description: Target Security Service (TSS) is a service that provides security features for the 5G network, specifically related to timing synchronization. It involves reporting of RAN TSS attributes from the gNB-DU to the gNB-CU and then to the AMF, which is responsible for managing access and mobility of user equipment in the 5G core network.
explanation: TSS is classified as a Service based on its role in providing security features related to timing synchronization in the 5G network. The context highlights the signaling flow for RAN TSS reporting towards the CN, which involves the AMF requesting RAN TSS reporting and the gNB-CU requesting RAN TSS reporting from at least one gNB-DU.
section_title: 8.24.1RAN TSS reporting towards the CN
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