Section: 6.8.1 PDCCH formats
Content: The physical downlink control channel carries scheduling assignments and other control information. A physical control channel is transmitted on an aggregation of one or several consecutive control channel elements (CCEs), where a control channel element corresponds to 9 resource element groups. The number of resource-element groups not assigned to PCFICH or PHICH is . The CCEs available in the system are numbered from 0 to, where . The PDCCH supports multiple formats as listed in Table 6.8.1-1 where PDCCH format 4 is supported only for non-MBSFN subframes in an MBMS-dedicated cell. A PDCCH consisting of consecutive CCEs may only start on a CCE fulfilling, where is the CCE number. Multiple PDCCHs can be transmitted in a subframe. Table 6.8.1-1: Supported PDCCH formats