annels Broadcast Control Paging Control Common Control Multicast Control Dedicated Control Dedicated Traffic Multicast Traffic Channel (BCCH) Channel (PCCH) Channel (CCCH) Channel (MCCH) Channel (DCCH) Channel (DTCH) Channel (MTCH) FIGURE 7-19 Classification of 3GPP LTE logical channels The physical layer provides information transfer services to MAC and higher layers. The physical layer transport services are described by how and with what characteristics data are transferred over the radio interface. This should be clearly separated from the classification of what is transported, which relates to the concept of logical channels at the MAC sub-layer. As shown in Figure 7-20, downlink transport channels can be classified as follows: Broadcast Channel (BCH) characterized by fixed, pre-defined transport format and required to be broadcast in the entire coverage area of the cell; CHAPTER 7 The IEEE 802. 16m MAC CPS (Part II) Transport Channels Downlink Uplink Broadcast Channel Downlink Shared Paging Channel Multicast Channel Uplink Shared Random Access (BCH) Channel (DL-SCH) (PCH) (MCH) Channel (UL-SCH) Channel (RACH) FIGURE 7-20 Classification of 3GPP LTE transport channels Downlink Shared Channel (DL-SCH) characterized by support for HARQ, support for dynamic link adaptation by varying the modulation, coding and transmit power, possibility for broadcast in the entire cell, possibility to use beamforming, support for both dynamic and semi-static resource allocation, support for UE discontinuous reception to enable power saving, support for MBMS transmission; Paging Channel (PCH) characterized by support for UE discontinuous reception in order to enable power saving, requirement for broadcast in the entire coverage area of the cell, mapped to physical resources which can be used dynamically also for traffic or other control channels; Multicast Channel (MCH) characterized by a requirement to be broadcast in the entire coverage area of the cell, support for macro-diversity combining of MBMS transmission on multiple ce