answer from the gNB, it retransmits the recovery request. 6 5G Physical Layer 6.12.3 CSI Framework The CSI framework consists of flexible configurability such that the network can obtain the various forms of CSI information in a straightforward manner. A set of key compo- nents are defined for this scope: Reporting settings refer to what CSI to report and when to report it. Resource settings configure what signals to use to compute the CSI. The two types of settings are employed on the basis of reporting configurations, which associate what CSI to report and when to report it in conjunction with the signals used to compute the CSI. In the following, we detail the three CSI framework components. 6.12.3.1 Reporting Settings The reporting settings consist of an indication of what quantities are to be reported, these being CSI or L1-RSRP related, and configuration information on the quantities to be reported. For example, in terms of codebooks, the parameterization of these codebooks covers both the time and frequency domain behavior. For the time behavior, the UE parameterization consists of information about the periodic, aperiodic, or semi-persistent transmission, while in the frequency domain, it consists of the report- ing bandwidth information and frequency granularity for PMI and CQI. In addition, time-domain restrictions for channel and interference measurements, or codebook subset restrictions, may be configured, similar to LTE. In terms of the applicability of such information, each reporting setting is associated with a single downlink BWP. 6.12.3.2 Resource Settings A resource setting configures a number of CSI resource sets, each CSI resource set con- sisting of CSI-RS resources, which can be either non-zero power (NZP) CSI-RS resource set(s) or CSI-IM or SS/PBCH block resources which are used for L1-RSRP computation. CSI-RS resource sets also exhibit a time-domain behavior which can be periodic, ape- riodic, or semi-persistent. If such time-domain behavior is periodic or semi-persistent, the number of C