What is Pdcch blind decoding?
Blind Decoding Using DCI Search The UE is only informed of the number of OFDM symbols within the control region of a subframe and is not provided with the location of its corresponding PDCCH. The UE finds its PDCCH by monitoring a set of PDCCH candidates in every subframe. This is referred to as blind decoding.
What is blind decoding in LTE?
Blind decoding, or blind detection, is an operation foreseen by the 3GPP LTE/LTE-Advanced standards to allow the user equipment (UE) to gather control information related to the downlink shared channel.
What is Pdcch format in LTE?
PDCCH is a physical channel that carries downlink control information (DCI) and it has characteristics as described below. Mapped to the first L OFDM symbols in every downlink subframe. Multiple PDCCH are supported and a UE monitors a set of control channels. Modulation Scheme is QPSK.
What is Pdsch and Pdcch?
The PDCCH is used for control information while the PDSCH carries the actual data. For example, if the UE has data in the PDSCH, it needs to know where the data is located. The PDCCH will tell the UE that the data it is looking for is located at this location on PDSCH.
What is Pdcch order?
PDCCH Order is a mechanism by which eNB force UE to initiate PRACH. But there is some case where Network (eNB) need to force UE to initiate the RACH. PDCCH Order is the mechanism. The role of PDCCH Order in normal LTE operation can be illustrated as shown below.
What is Pdcch aggregation level?
The number of consecutive CCEs required to carry one PDCCH is called “Aggregation Level’. It means that even the same DCI with exactly same bit length, the number of physical channel bits gets different depending on which PDCCH format it is carried by.
What is Pdcch candidate?
All the possible location for PDCCH is called ‘Search Space and each of the possible location is called ‘PDCCH Candidates’. The search space indicates the set of CCE locations where the UE may find its PDCCHs. Each PDCCH carries one DCI and is identified by RNTI.
What is Pdcch used for?
The Physical Downlink Control Channel (PDCCH) is primarily used to carry scheduling information to individual UEs, i.e., resource assignments for uplink and downlink data and control information. The PDCCH is located in the first few OFDM symbols of a subframe.
What is Rach preamble in LTE?
How the information is encoded into PRACH (RACH Preamble)? In LTE, all the information (data) after PRACH Preamble has its own binary structure meaning that they are translated into a certain data structure. However, the information in PRACH Preamble is represented by purely physical properties.
What is prach mask index in LTE?
The PRACH mask index identifies which PRACH resources the UE is allowed to use for its access attempt (see 36.32, section 7.3). More specifically, the mask defines in whichPRACH (or PRACHs) within a frame a UE can transmit a Random Access Preamble.
What are Pdcch candidates?
What is Pdcch 5G?
Similar to the previous radio access systems, e.g., LTE, 5G new radio(NR) uses the Physical Downlink Control Channel(PDCCH) to perform physical layer control functions such as Scheduling the Downlink(DL) broadcast and DL/uplink(UL) unicast data transmission and signaling triggers for periodic and aperiodic transmission …
Do you need UE for blind decoding of pdcch?
After performing deinterleaving, deprecoding, symbol combining, symbol demodulation and descrambling at the receiver, the UE is required to perform blind decoding of the PDCCH payload as it is not aware of the detailed control channel structure, including the number of control channels and the number of CCEs to which each control channel is mapped.
How is DCI search used in blind decoding?
Blind Decoding Using DCI Search The UE is only informed of the number of OFDM symbols within the control region of a subframe and is not provided with the location of its corresponding PDCCH. The UE finds its PDCCH by monitoring a set of PDCCH candidates in every subframe. This is referred to as blind decoding.
Which is the physical downlink control channel pdcch?
PDCCH ( Physical downlink Control Channel ) :- This channel carries the control information about the data being transmitted on the current subframe and the information about the resources which UE need to use for the uplink data. That means it is mandatory for the UE to decode it successfully if it wants to send some data or receive something.
How are the pdcch bits created in DCI?
The PDCCH bits are created from a DCI message after performing CRC attachment, channel coding and rate matching. Multiple PDCCHs can be transmitted in a subframe thus the UE must monitor all PDCCH in given subframe control region.