LTE PDSCH channel-Physical Downlink Shared Channel
This page describes LTE PDSCH channel or Physical Downlink Shared Channel with respect to LTE system.
The PDSCH channel is the main data bearing channel which is allocated to users on a dynamic and opportunistic basis. The PDCH is also used to transmit broadcast information not transmitted on the PBCH which include System Information Blocks (SIB) and paging & RRC signalling messages. PDSCH is also used to transfer application data. Refer LTE MIB and SIB page for MIB and SIB description.
• Paging messages-These are broadcast using PDSCH channel. LTE UE in RRC IDLE mode monitor PDCCH for paging indications.
Based on trigeer it will decode the paging message carried in PDSCH RBs.
• Downlink RRC Signalling messages-These are carried by PDSCH. Signalling Radio Bearers(SRB) will use PDSCH. Every connection usually will have its own set of SRB.
For LTE PDSCH channel uses QPSK, 16QAM, 64QAM modulation types. LTE eNodeB selects suitable modulation type based on adaptation algorithm. This further depends on radio channel condition and buffer capacity. QPSK is most robust scheme and hence it is used for transmission of SIB and Paging. As the name suggests PDSCH is a shared channel and hence its RBs are shared among all the active connections.
LTE PDSCH channel Reference: 3GPP TS 36.211
LTE RELATED LINKS
Difference between SC-FDMA and OFDMA
LTE Cyclic Delay Diversity
LTE eNodeB Physical Layer Measurements
LTE EPC Network Inerfaces
LTE UE Physical Layer Measurements
LTE Bearer types
LTE UE Event Measurement Reporting
LTE RSRP vs RSRQ
LTE Signalling radio bearers
LTE EPS mobility management states
LTE EPS connection management states
LTE UE cell selection
LTE UE PLMN selection
LTE UE Paging Procedure