What is search space in LTE?
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 channel in LTE?
PDCCH (Physical Downlink Control Channel) 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. Number of the symbols (L) for PDCCH can be 1,2, or 3. (
What is Pdsch and Pdcch?
PDCCH is made up of CCEs (Control Channel Elements) and each CCE is made up of 36 REs (Resource Elements). PDCCH further uses a concept of aggregation layers which is a group of CCEs. There are 4 aggregation layers in the normal PDCCH.
What is Pdcch blind detection?
If a PDCCH candidate passes the CRC after RNTI unmasking, the UE shall claim the PDCCH candidate as its own correctly decoded DCI. This necessary UE process in cellular communications is called blind detection or blind decoding in the 3GPP standards of 4G-LTE and 5G-NR.
What is a search space?
If we are solving a problem, we are usually looking for some solution which will be the best among others. The space of all feasible solutions (the set of solutions among which the desired solution resides) is called search space (also state space). Each point in the search space represents one possible solution.
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.
How do you decode Pdcch?
The UE finds the PDCCH specific to it by monitoring a set of PDCCH candidates (a set of consecutive CCEs on which a PDCCH could be mapped) in every subframe. The UE uses its Radio Network Temporary Identifier (RNTI) to try and decode candidates. The RNTI is used to demask a PDCCH candidate’s CRC.
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 is solution space search?
The solution space is the set of all possible solutions for the combinatorial optimization problem. The solution space of the Vertex Separation Problem contains all the linear orderings of the vertices. Thus, the cardinality of the solution space of VSP is .
How can one define problem as a search space problem?
Problems are often modelled as a state space, a set of states that a problem can be in. The set of states forms a graph where two states are connected if there is an operation that can be performed to transform the first state into the second.