number of streams. This parameter signals the precoding matrix index where 4-bit PMI is used for 2 MS transmit antennas and 6-bit PMI is used for 4 MS transmit antennas. Resource Index The Resource Index field in the UL Basic Assignment A-MAP IE is interpreted the same as in the DL Basic Assignment A- MAP IE. The resource index specifies the resource location and the allocation size. If all bits are set to 1, the MS will not transmit the corresponding HARQ sub-packet for the ACID in this IE. Long III Indicator Indicates number of uplink subframes occupied by the allocated resource where transmission time interval can be one uplink subframe or 4 uplink subframes in FDD mode or all uplink subframes in TDD mode. If in a particular frame configuration, the number of DL subframes is less than the number of UL subframes, the Long TTI Indicator will be set to HARQ Feedback Allocation HARQ Identifier Sequence Number HARQ Channel Identifier MIMO Signaling in the UL Basic Assignment A-MAP IE PMI Indicator (1 bit) 0b0: PMI not signaled explicitly 0b1: PMI signaled explicitly CSM (1 bit) 0b0: CSM disabled 0b1: CSM enabled PMI Indicator CSM 0b0? CSM 0b0? CSM with Precoding SU-MIMO with Precoding (Adaptive w/o PMI (Adaptive w/o PMI Vertical Encoding Vertical Encoding /Non-adaptive) /Non-adaptive) CSM with PMI SU-MIMO with PMI Number of Streams Transmission Format Number of Streams Precoding Flag (1 bit) (2 bits) 0b0: Non-adaptive (4 bits) (2 bits) 0b00: 1 stream CSM format includes all 0b00: 1 stream 0b1: Adaptve 0b01: 2 streams 16 combinations of TNS, 0b01: 2 streams 0b10: 3 streams SI and number of streams 0b10: 3 streams 0b11: 4 streams 0b11: 4 streams Transmission Format (4 bits) CSM format includes all MEF (1 bit) PMI (4 bits) Downline 16 combinations of TNS, SI and number of streams 0b0: SFBC PMI (6 bits) 0b1: Vertical Encoding 4 bits PMI for Nt =2 6 bits PMI for Nt = 4 MEF 0b0? Precoding Flag SU-MIMO (1 bit) 0b0: Non-adaptive 0b1:Adaptve FIGURE 10-8 MIMO signaling in the UL basic assignment A-MAP IE [119] 514 CHAPTER 10