: compact downlink allocation for one PDSCH codeword with precoding and power offset information; 7. Format 2: downlink allocation for UEs configured in closed-loop spatial multiplexing mode; 8. Format 2A: downlink allocation for UEs configured in open-loop spatial multiplexing mode; 9. Format 2B: downlink allocation with dual-layer transmission (corresponding to antenna ports 7 and 8) with spatial multiplexing; 10. Format 3: transmission of Transmit Power Control (TPC) commands for PUCCH and PUSCH with 2-bit power adjustments; 11. Format 3A: transmission of TPC commands for PUCCH and PUSCH with 1-bit power adjustments. The CRC of the DCI is scrambled with the UE identity that is used to find the allocation by the UE. In order to efficiently use the resources in PDCCH, other DCI formats are defined which are optimized for specific use cases and transmission modes, including scheduling of paging channel, random access response, and system information blocks. DCI formats 2 and 2A provide downlink shared channel assignments in case of closed-loop or open-loop spatial multiplexing, respectively. In these cases, scheduling information is provided for two codewords within one control message. In addition, DCI format 0 conveys uplink scheduling grants, and DCI formats 3 and 3A carry transmit power control commands for the uplink. There are different ways to signal the resource allocation within the DCI, in order to trade-off between signaling overhead and flexibility. For example, DCI format 1 may use resource allocation types 0 or 1 as described in the following. An additional resource allocation type 2 is specified for other DCI formats. In resource allocation type 0, a bitmap indicates the resource block groups that are allocated to a UE. A Resource Block Group (RGB) is defined which consists of a set of consecutive physical resource blocks (1 to 4 depending on system bandwidth). The allocated resource block groups do not have to be adjacent in frequency-domain. Figure 9-74 illustrates example resource block groups f