ion mode, the UE determines its codebook subsets based on New Radio Access Physical Layer Aspects (Part 2) 641 TPMI and following reception of RRC parameter codebookSubset in pusch-Config, which may be configured with "fullyAndPartialAndNonCoherent" or "partialAndNonCoherent", or "nonCoherent" depending on the UE capability. The maximum transmission rank may be configured by the higher parameter maxRank in pusch-Config. Furthermore, for codebook- based transmissions, the UE may be configured with a single SRS-ResourceSet, and only one SRS resource can be indicated based on the SRI in the SRS resource set. The maximum number of configured SRS resources for codebook-based transmission is 2. If aperiodic SRS is configured for a UE, the SRS request field in DCI triggers the transmission of aperi- odic SRS resources [9]. The codebook subset restriction concept was introduced in LTE [15]. It helps avoid CSI reporting for the undesired (spatial) directions. The LTE codebook subset restriction includes RI and PMI restriction, which provides sufficient flexibility to control PMI calcula- tion and transmission from the UE. The content of CSI in NR is very similar to LTE, in the sense that NR supports CSI components such as RI and PMI. Since the number of possible RI values is small, bitmap with one-to-one correspondence between each bit in bitmap, and RI value can be specified for the purpose of RI restriction. At the same time, the number of possible PMI values especially for larger number of antenna ports is very large to support one-to-one correspondence between PMIs and bits in the bitmap. Therefore, a solution with reduced signaling overhead should be considered. More specifically, similar to LTE, a DFT beam restriction is introduced, SO that the PMI can be considered as restricted, if at least one beam is restricted by the corresponding DFT beam restriction bitmap. For co-phasing of the polarization, the bitmap should not be used as it does not affect the beamforming direction. The NR Type-I single-panel codebook str