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UE 5G NR Search Space Types | Type0, Type0A, Type1, Type2, Type3

This page mentions UE 5G NR Search Space Types. It describes search space types viz. Type0, Type0A, Type1, Type2, Type3 and UE specific search space sets as defined in 5G NR standards. It mentions fields used in Search Space information element (IE) used by RRC layer.

Introduction:
• It is similar to LTE search space.
• It is the area in the downlink frame where PDCCH might be transmitted.
• This area has been monitored by the UE to search for the PDCCH carrying data (i.e. DCI).
• There are two types of search spaces viz. common and UE-specific. These are mentioned in the following table.

5G NR Search Space Types Description
Type0 • PDCCH common search space set configured by searchSpaceZero in MasterInformationBlock or by searchSpaceSIB1 in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a SI-RNTI on a primary cell
Type0A • PDCCH common search space set configured by searchSpace-OSI in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a SI-RNTI on a primary cell
Type1 • PDCCH common search space set configured by ra-SearchSpace in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a RA-RNTI, or a TC-RNTI on a primary cell
Type2 • PDCCH common search space set configured by pagingSearchSpace in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a P-RNTI on a primary cell
Type3 • PDCCH common search space set configured by SearchSpace in PDCCH-Config with searchSpaceType = common for DCI formats with CRC scrambled by INT-RNTI, or SFI-RNTI, or TPC-PUSCH-RNTI, or TPC-PUCCH-RNTI, or TPC-SRS-RNTI and, only for the primary cell, C-RNTI, or CS-RNTI(s)
UE specific search space • This set configured by SearchSpace in PDCCH-Config with searchSpaceType = ue-Specific for DCI formats with CRC scrambled by C-RNTI, or CS-RNTI(s).

Search Space Information Element (IE)

• Following structure mentions various fields used by RRC Search Space Information Element (IE).
• This IE defines how and where to search for PDCCH candidates.
• Each search space is associated with one ControlResourceSet.

search space IE1 search space IE2

REFERENCES

• 3GPP TS 38.213
• 3GPP TS 38.331



5G NR Numerology | 5G NR Terminology


5G NR Control channels | 5G NR Traffic Channels | 5G NR Reference Signals and sequences


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