5G • RAN
USS
UE-Specific Search Space
PDCCH search space dedicated to an individual UE for unicast uplink and downlink scheduling grants.
Technical Explanation
Configured via RRC in SearchSpace IE, USS candidate CCEs are derived using a hashing function seeded with the UE's C-RNTI. The UE monitors USS candidates across aggregation levels 1, 2, 4, 8, and 16 for DCI Formats 0_1, 0_2, 1_1, and 1_2 to receive dynamic resource allocations.
Key Functions
- Provides dedicated scheduling candidates hashed by C-RNTI
- Carries unicast PDSCH assignments and PUSCH uplink grants
- Supports beam-formed control channel transmission tailored to UE position
Specifications
3GPP TS 38.213
Interfaces
Uu
Related 5G Concepts
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