Physical channels correspond to sets of time-frequency resources used for transmission of particular transport channel data, control information, or indicator information. Each transport channel is mapped to a corresponding physical channel. The red outline contains LTE Toolbox™ downlink functionality for physical channels, transport channels, and control information.
PBCH — physical broadcast channel
The PBCH carries part of the system information required for terminals to access the network.
PDSCH — physical downlink shared channel
The PDSCH carries user data and paging information to the terminal.
PDCCH — physical downlink control channel
The PDCCH conveys control information, scheduling decisions for PDSCH reception, and for scheduling grants enabling transmission on the PUSCH.
PCFICH — physical control format indicator channel
The PCFICH provides terminals with information to decode the set of PDCCHs. There is only one PCFICH per component carrier.
PHICH — physical hybrid-ARQ indicator channel
The PHICH conveys the hybrid-ARQ acknowledgment indicating to the terminal whether the retransmission of a transport block is required.
EPDCCH — enhanced physical downlink control channel
The EPDCCH is intended to be used to improve spectral reuse of control channel resources. It supports CoMP, downlink MIMO, beamforming, and frequency domain inter-cell interference coordination (ICIC).
Physical Broadcast Channel
|Physical broadcast channel|
|PBCH resource element indices|
|PBCH pseudorandom scrambling sequence|
|Physical broadcast channel decoding|
Physical Downlink Shared Channel
|Physical downlink shared channel|
|Generate NPDSCH symbols|
|Physical downlink shared channel (PDSCH) resource element indices|
|Generate NPDSCH RE indices|
|UE-specific demodulation reference signals|
|UE-specific DM-RS resource element indices|
|PDSCH pseudorandom scrambling sequence|
|Physical downlink shared channel decoding|
|Decode NPDSCH symbols|
Physical Downlink Control Channel
|Physical downlink control channel|
|PDCCH resource element indices|
|PDCCH pseudorandom scrambling sequence|
|PDCCH interleaving and cyclic shift|
|PDCCH deinterleaving and cyclic shifting|
|PDCCH downlink control information search|
|PDCCH search space candidates|
|PDCCH resource information|
|Physical downlink control channel decoding|
Physical Control Format Indicator Channel
|Physical control format indicator channel|
|PCFICH resource element indices|
|PCFICH pseudorandom scrambling sequence|
|PCFICH resource information|
|Physical control format indicator channel decoding|
Physical Hybrid-ARQ Indicator Channel
|Physical hybrid ARQ indicator channel|
|PHICH resource element indices|
|PHICH resource information|
|PHICH pseudorandom scrambling sequence|
|PHICH OSFBC decoding|
|Physical hybrid ARQ indicator channel decoding|
Enhanced Physical Downlink Control Channel
|Enhanced physical downlink control channel|
|Enhanced physical downlink control channel (EPDCCH) resource element indices|
|EPDCCH demodulation reference signals|
|EPDCCH DM-RS resource element indices|
|EPDCCH pseudorandom scrambling sequence|
|Enhanced downlink control information search|
|Enhanced physical downlink control channel (EPDCCH) decoding|
Resource Element Group
- Resource Element Groups (REGs)
Introduces resource element groups (REGs) used for defining the mapping of control channels.
- PBCH Processing Functions
Block diagram view of the physical broadcast channel (PBCH) processing and associated functions in the LTE Toolbox.
- Downlink Shared Channel
Describes the processing of transport blocks (data) to create the downlink shared channel and the physical channel processing to create the physical downlink shared channel.
- PDSCH Processing Functions
Block diagram view of the physical downlink shared channel (PDSCH) processing and associated functions in the LTE Toolbox.
- Model DL-SCH and PDSCH
This example shows how to construct the physical downlink shared channel (PDSCH).
- Downlink Control Channel
Describes downlink control information (DCI) messages, DCI channel coding, and the physical channel processing to create the physical downlink control channel.
- PDCCH Processing Functions
Block diagram view of the physical downlink control channel (PDCCH) processing and associated functions in the LTE Toolbox.
- Model DCI and PDCCH
This example shows how to model the control region used in an LTE downlink subframe and its channel structure.
- PDCCH Blind Search and DCI Decoding
The example aids understanding of the control region used in an LTE downlink subframe and its channel structure by showing how a downlink control information (DCI) message is generated and transmitted over a physical downlink control channel (PDCCH) and recovered by performing blind decoding using the LTE Toolbox™.
- Control Format Indicator (CFI) Channel
Describes the control format indicator (CFI) .
- PCFICH Processing Functions
Block diagram view of the physical control format indicator channel (PCFICH) processing and associated functions in the LTE Toolbox.
- Model CFI and PCFICH
This example shows how to generate a PCFICH with LTE Toolbox™.
- HARQ Indicator (HI) Channel
Describes the hybrid automatic repeat request (HARQ) scheme for error correction, the HARQ Indicator (HI), and the physical channel processing to create the physical HARQ indicator channel.
- PHICH Processing Functions
Block diagram view of the physical HARQ indicator channel (PHICH) processing and associated functions in the LTE Toolbox.
- Model HARQ Indicator and PHICH
This example shows how to implement the HARQ Indicator (HI) and physical HI channel (PHICH).