PDSCH Resource Mapping via PDCCH Detection in Multi-TRP Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-antenna wireless communication systems, particularly in multi-Transmission Reception Point (TRP) systems, there is a challenge in effectively transmitting and mapping control channels without collisions between the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH), especially due to inconsistencies in understanding PDCCH candidates between base stations and User Equipment (UE).
Innovation Solution
A method is introduced where a first node determines search space sets for PDCCH candidates and uses target control signaling to identify available resources for PDSCH transmission, considering the aggregation level, Quasi Co-Location, and pre-coder granularity of CORESETs to avoid collisions and optimize resource mapping, ensuring efficient transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP transmission is used to enhance transmission robustness, then transmission reliability is improved, but resource collision between PDCCH and PDSCH occurs
Solution Approach 1:
The patent applies preliminary action by determining the resource occupancy status of PDCCH candidates before mapping PDSCH resources. The network device performs blind detection or obtains indication information in advance to identify which PDCCH candidates are actually occupied, then uses this information to guide PDSCH resource mapping decisions, preventing resource collisions before they occur.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device feeds back detection results or indication information about PDCCH candidates to the network device. This feedback loop allows the network device to adjust PDSCH resource mapping based on actual PDCCH occupancy status, resolving the contradiction between maintaining multi-TRP transmission robustness and avoiding resource collisions.
2Reliability
If PDCCH candidates are monitored in multiple search space sets, then control channel coverage is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by treating different PDCCH candidates differently based on their actual occupancy status. Instead of uniformly avoiding all potential PDCCH resources, the system identifies specifically which candidates are occupied through blind detection or indication information, and only adjusts PDSCH mapping for those specific occupied resources, leaving other resources available for efficient utilization.
Solution Approach 2:
The patent changes the parameter of PDSCH resource mapping dynamically based on PDCCH occupancy status. When PDCCH candidates are detected or indicated as occupied, the PDSCH mapping parameters are adjusted to avoid those specific resources. When no PDCCH is occupied, the original mapping parameters are maintained, optimizing resource utilization efficiency while still providing control channel coverage.
3Reliability
If resource mapping avoids all potential PDCCH resources, then collision avoidance is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent uses preliminary action by performing blind detection or obtaining indication information about PDCCH occupancy before finalizing PDSCH resource mapping. This advance knowledge allows the system to avoid only the specific PDCCH resources that are actually occupied, rather than conservatively avoiding all potential PDCCH resources, thereby maintaining data transmission efficiency while ensuring collision avoidance.
Data Source
AI summary
A node receives a first information block, the first information block is used to determine a first search space set and a second search space set, and a PDCCH candidate comprised in the first search space set and a PDCCH candidate comprised in the second search space set are correspondingly linked; a node receives a target control signaling and receives a first PDSCH, the target control signaling is used to determine a target time-frequency resource set; the first PDSCH belong to the target time-frequency resource set; a first PDCCH is used to carry the target control signaling, an AL of the first PDCCH is not equal to an AL of a second PDCCH; whether the first PDCCH is detected is used to determine whether resources occupied by the second PDCCH are available for the first PDSCH. The present application guarantees the performance of the PDSCH.