Downlink and Uplink Physical Channels in Long Term Evolution

Long Term Evolution (LTE) defines a number of physical channels to carry information blocks received fro m the MAC and h igher layers.This paper presents two types of Physical channels: the first type is downlin k physical channels which consist of Physical Broadcast Channel (PBCH), Physical Downlink Shared Channel (PDSCH), Physical Multicast Channel (PMCH), Physical Do wnlink Control Channel (PDCCH), Physical Control Format Indicator Channel (PCFICH) and Physical Hybrid A RQ Indicator Channel (PHICH).The second type of Physical channels is uplink physical channels which consist of Physical Up lin k Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) and Physical Random Access Channel (PRA CH).This paper also highlights the structure of PDSCH and PUSCH, discuss the algorithms of the two types of physical channel and each of its features.The aim of this paper is to discuss the well-designed PHY Channels which provide high cell-edge performance with specific features, such as dynamic bandwidth allocation to users, the design of reference signals and control channels.These channels take into account a more challenging path loss and interference environment at the cell edge.