ort the positions of these M sub-bands using bits. The UE should also report one CQI value reflecting transmission only over the selected M best sub-bands determined in the previous step. Additionally, the UE should report one wideband CQI value. The best-M CQI value is encoded differentially using 3 b relative to the wideband CQI. Supported sub-band size k and M values include those shown in Table 5.9. The k and M values are a function of system bandwidth. 5.4.3 Periodic CQI Reporting Using PUCCH A UE is semistatically configured by higher layers to feed back different CQI types on the PUCCH periodically, using the following periodicity parameters: © 2009 by Taylor & Francis Group, LLC Long Term Evolution: 3 GPP LTE Radio and Cellular Technology Table 5.9 Sub-Band Size (k) and M Values versus DL System Bandwidth System Bandwidth Sub-Band Size k [RBs] (Wideband CQI only) (Wideband CQI only) 11-26 27-64 64-110 Np is the periodicity of the subframe pattern allocated for the CQI reports in terms of subframes where the minimum reporting interval is NPMIN. NOFFSET is the subframe offset. Support for different CQI report types includes wideband CQI on set S and frequency-selective CQI. The supported sub-band size (k) values include those given in Table 5.8, which are a function of system bandwidth. For the frequency-selective CQI, a CQI report in a certain subframe describes the channel quality in a particular part or in particular parts of the bandwidth (a part is frequency consecutive and an integer multiple of the sub-band size). Which bandwidth parts to use varies deterministically from one CQI report subframe to another, covering the entire set of sub-bands (S) after a finite period. A UE with a scheduled PUSCH transmission in the same subframe as its CQI report uses the same PUCCH-based reporting format when reporting CQI on the PUSCH unless an associated PDCCH with scheduling grant format indicates an aperiodic report is required. 5.5 Summary 3GPP LTE has considered MIMO OFDM as one of the key techniques to achi