PDCCH/PDSCH Spatial Division Multiplexing for Reduced-Capability Coverage
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently supporting reduced capability devices due to reduced downlink coverage and resource inefficiencies, which are exacerbated by bandwidth limitations and fewer antennas in these devices.
Innovation Solution
Implement spatial division multiplexing (SDM) techniques for PDCCH and PDSCH transmissions, including enhanced search space set configurations, DM-RS enhancements, and scrambling identifiers to improve coverage and resource efficiency for reduced capability devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spatial division multiplexing is implemented for PDCCH and PDSCH transmissions, then downlink coverage is enhanced, but device complexity increases
Solution Approach 1:
The patent segments the downlink transmission into multiple spatial streams that can be independently processed and received by reduced capability devices. By dividing the transmission into separate spatial components with distinct QCL relationships, the system enables devices with fewer antennas to receive signals effectively without requiring full MIMO capabilities, thus improving coverage while managing device complexity.
Solution Approach 2:
The patent introduces spatial dimension as an additional resource for multiplexing PDCCH and PDSCH transmissions. By utilizing different spatial domains with quasi co-location relationships, the system achieves higher coverage area and capacity without proportionally increasing the antenna count or processing complexity at the device level.
2Reliability
If spatial division multiplexing is used to improve coverage, then resource utilization increases, but throughput may be affected
Solution Approach 1:
The patent applies different QCL configurations and spatial parameters to different transmission components based on their specific requirements. By tailoring the spatial division multiplexing parameters locally for each PDCCH and PDSCH transmission, the system optimizes coverage for each component without unnecessarily sacrificing throughput, achieving a balanced performance profile.
Solution Approach 2:
The system dynamically configures spatial division multiplexing parameters based on device capability and channel conditions. Reduced capability devices can be dynamically assigned appropriate spatial streams and QCL relationships, allowing the system to adaptively balance between coverage enhancement and throughput maintenance based on real-time conditions.
Data Source
AI summary
A user equipment (UE) receives information for a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH), where the PDCCH/PDSCH are broadcast or group-cast from a base station and have a quasi co-location relationship with a synchronization signal/PBCH (SSB) block or a channel state information reference signal (CSI-RS) beam. The UE monitors for or receives the PDCCH/PDSCH based on at least one of a search space (SS) set configuration enhancement for the PDCCH, a demodulation reference signal (DM-RS) resource configuration enhancement for the PDCCH or the PDSCH, or a scrambling identifier set enhancement for payload bits of the PDCCH or the PDSCH, which support the spatial division multiplexing (SDM) with another PDCCH/PDSCH that are broadcast or group-cast from the same base station and have the quasi co-location relationship with a different SSB block or a different CSI-RS beam.