ling frequency (MHz) Number of occupied sub-carriers 14/12 (Normal/Extended CP) Number of OFDM symbols per sub frame 4.69 X 6, 5.21 X 1 Normal Cp length (us) Extended 16.67 Sources: C 2009 3G Americas [11], C 2009 3GPP [13] and [14] 3GPP Evolved Packet System (EPS) 3.5.3.2 Channels A downlink physical channel corresponds to a set of resource elements carrying information originating from higher layers. Six physical channels are defined for EPS downlink namely [13]: (Physical Downlink Shared Channel) (PDSCH): The physical downlink shared channel is used to send common user data and control information (such as paging messages) to all mobile devices operating within its coverage area. (Physical Broadcast Channel) (PBCH): The coded BCH transport block is mapped to four subframes within a 40 ms interval. The 40 ms timing is blindly detected, that is, there is no explicit signaling indicating 40 ms timing. Each subframe is assumed to be self-decodable, that is, the BCH can be decoded from a single reception, assuming sufficiently good channel conditions. (Physical Multicast Channel) (PMCH): It carries the multicast channel (MCH). MBSFN is supported for MCH. (Physical Control Format Indicator Channel) (PCFICH): It informs the UE about the number of OFDM symbols used for the PDCCHs and it is transmitted in every downlink or special subframe. (Physical Downlink Control Channel) (PDCCH): It informs the UE about the resource allocation of transport PCH (paging channel) and DL-SCH (shared channel) channels, and Hybrid ARQ information related to DL-SCH and it carries the uplink scheduling grant. Multiple physical downlink control channels are supported and a UE monitors a set of control channels. Control channels are formed by aggregation of control channel elements, each control channel element consisting of a set of resource elements. Different code rates for the control channels are realized by aggregating different numbers of control channel elements. QPSK modulation is used for all control channels. (Physical Hybrid ARQ