Reference Signal Transmission Prior to RMSI PDCCH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting reference signals prior to Remaining Minimum System Information (RMSI) Physical Downlink Control Channel (PDCCH) communications, particularly in millimeter wave (mmWave) communications, which limits beam gain and throughput due to the use of wide transmit beams.
Innovation Solution
The method involves a base station transmitting a reference signal, such as a demodulation reference signal (DMRS) or channel state information reference signal (CSI-RS), prior to RMSI PDCCH transmission, indicated by a physical broadcast channel (PBCH) communication, allowing user equipment (UE) to refine its receive beam and increase beam gain and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wide transmit beams are used for RMSI PDCCH transmission, then coverage area is improved, but beam gain and throughput deteriorate
Solution Approach 1:
The base station transmits reference signals (DMRS or CSI-RS) before the RMSI PDCCH transmission. The UE uses these reference signals to perform receive beam refinement and determine optimal receive beams in advance, so that when the wide transmit beam is used for coverage, the UE can still achieve high beam gain through refined receive beam selection
Solution Approach 2:
The UE measures the reference signals transmitted by the base station and provides feedback by selecting and indicating the best receive beams based on measured signal quality. This feedback mechanism enables the UE to adapt its receive beam to match the transmitted signal, achieving high beam gain even with wide transmit beams
2Area of stationary object
If wide transmit beams are used for RMSI PDCCH transmission, then coverage area is improved, but beam gain deteriorates
Solution Approach 1:
The base station transmits reference signals (DMRS or CSI-RS) before the RMSI PDCCH transmission. The UE uses these reference signals to perform receive beam refinement and determine optimal receive beams in advance, so that when the wide transmit beam is used for coverage, the UE can still achieve high beam gain through refined receive beam selection
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a physical broadcast channel (PBCH) communication from a base station (BS). The UE may identify, based at least in part on a determination that the PBCH communication indicates a reference signal that is to be transmitted prior to transmission of a remaining minimum system information (RMSI) physical downlink control channel (PDCCH) communication, one or more radio resources in which the reference signal is to be transmitted. The UE may monitor for the reference signal, from the BS, in the one or more radio resources prior to reception of the RMSI PDCCH communication. Numerous other aspects are provided.