PDSCH Bandwidth Switching with Shared DMRS
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently updating the bandwidth of physical downlink shared channels (PDSCH) transmissions associated with shared configured demodulation reference signals (DMRS), particularly in high-frequency bands like 5G NR FR2, where PDCCH/PDSCH multiplexing is optimized for lower frequency ranges.
Innovation Solution
The system determines an updated bandwidth for a scheduled PDSCH transmission associated with a physical downlink control channel (PDCCH) transmission and a shared configured DMRS. This updated bandwidth can be dynamically adjusted based on path loss between the network entity and the user equipment (UE), and configuration information indicative of the updated bandwidth is transmitted to the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bandwidth of PDSCH transmission is updated dynamically based on path loss, then resource utilization and adaptability to channel conditions improve, but the complexity of bandwidth management and configuration increases
Solution Approach 1:
The network entity pre-configures multiple bandwidth parts (BWPs) with different bandwidth characteristics before actual transmission. The UE is provided with a set of candidate BWPs in advance, and the network entity selects and indicates the appropriate BWP based on current channel conditions, avoiding real-time complex calculations at the UE side.
Solution Approach 2:
The patent changes the bandwidth parameter of PDSCH transmission by switching between pre-configured bandwidth parts. The network entity dynamically adjusts the active BWP index based on path loss measurements, thereby changing the transmission bandwidth without requiring complex real-time reconfiguration of the entire system.
2Loss of substance
If shared configured DMRS is used for both PDCCH and PDSCH, then reference signal overhead is reduced, but bandwidth update flexibility for PDSCH is limited
Solution Approach 1:
The patent segments the bandwidth configuration into multiple bandwidth parts (BWPs), where each BWP represents a distinct frequency range with specific bandwidth characteristics. This segmentation allows independent configuration and switching of BWPs for PDSCH while maintaining the shared DMRS structure for both PDCCH and PDSCH.
Solution Approach 2:
The system introduces dynamic BWP switching capability that allows the network entity to change the active bandwidth part for PDSCH transmissions based on channel conditions. The shared DMRS configuration remains static, but the active BWP index can be dynamically updated through DCI or MAC CE signaling, providing flexibility without increasing reference signal overhead.
Data Source
AI summary
Systems and techniques are provided for wireless communication. A process can include determining an updated bandwidth corresponding to a scheduled physical downlink shared channel (PDSCH) transmission, wherein the scheduled PDSCH transmission is associated with a physical downlink control channel (PDCCH) transmission. The PDSCH transmission and the PDCCH transmission can be associated with a shared configured DMRS. The process can include receiving, based on the shared configured DMRS, the scheduled PDSCH transmission using the updated bandwidth.