PDSCH DM-RS Collision Handling with PDCCH CORESET
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively handling collisions between physical downlink shared channel (PDSCH) demodulation reference signals (DM-RS) and physical downlink control channel (PDCCH) control resource sets (CORESETS) or resource sets for rate-matching, which can lead to signal interference and reduced performance.
Innovation Solution
The proposed solution involves techniques for shifting, puncturing, or assuming the position of the PDSCH DM-RS in cases of overlap with PDCCH CORESETS or rate-matching resource sets, ensuring minimal interference and maintaining efficient signal processing timelines for user equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDSCH DM-RS and PDCCH CORESETS are transmitted simultaneously in overlapping time-frequency resources, then resource utilization is maximized, but signal interference increases and signal integrity deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the collision between PDSCH DM-RS and PDCCH CORESETS before transmission occurs. The UE identifies overlapping time-frequency resources in advance and applies rate-matching techniques to avoid the collision, thereby preventing signal interference while maintaining resource utilization efficiency.
Solution Approach 2:
The patent introduces rate-matching as an intermediary mechanism between PDSCH DM-RS and PDCCH CORESETS. When collisions are detected, rate-matching adjusts the resource allocation by matching the PDSCH resources around the PDCCH CORESET resources, effectively mediating the conflict and allowing both signals to be transmitted without severe interference.
2Reliability
If PDSCH DM-RS position is shifted or punctured to avoid collision with PDCCH CORESETS, then signal interference is reduced, but processing complexity increases
Solution Approach 1:
The patent applies dynamics by making the PDSCH DM-RS position flexible rather than fixed. The UE can dynamically shift or puncture the DM-RS position based on the detected PDCCH CORESET locations. This dynamic adjustment allows the system to adapt to different collision scenarios while maintaining signal integrity through standardized processing procedures.
3Reliability
If collision handling techniques are implemented for PDSCH DM-RS and PDCCH CORESETS, then signal integrity is improved, but processing time increases
Solution Approach 1:
The patent minimizes processing time loss by performing collision detection and rate-matching configuration in advance, during the scheduling phase. The UE determines the PDCCH CORESET positions and configures the appropriate rate-matching patterns before actual data transmission begins, allowing collision handling to occur with minimal impact on real-time processing deadlines.
Data Source
AI summary
A user equipment (UE) can include processing circuitry configured to decode control information of a physical downlink control channel (PDCCH) received via a resource within a control resource set (CORESET) occupying a subset of a plurality of OFDM symbols within a slot. At least one of the symbols in the subset coincides with a pre-defined symbol location associated with a demodulation reference signal (DM-RS) of a PDSCII. The DM-RS can be detected within the slot, the DM-RS starting at a symbol location that is shifted from the pre-defined symbol location and following the subset of symbols. Downlink data scheduled by the PDCCH and received via the PDSCH can be decoded, where the decoding is based on the detected DM-RS.