Multi-DCI PDSCH Scheduling With TCI State Mapping for Multi-TRP
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently scheduling Physical Downlink Shared Channel (PDSCH) transmissions using single and multi-DCI methods, particularly in scenarios involving multiple Transmission/Reception Points (TRPs), leading to suboptimal data reception and beam management due to varying propagation channels and lack of efficient TCI state management.
Innovation Solution
A method for mixed signal Downlink Control Information (DCI) and multi-DCI PDSCH scheduling, involving the configuration of multiple CORESETs and TCI states, with activation commands mapping TCI states to codepoints, allowing for simultaneous reception of PDSCHs from multiple TRPs, and utilizing default TCI states for timely data decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single DCI method is used for PDSCH scheduling, then device complexity is reduced, but reliability deteriorates due to lack of diversity transmission
Solution Approach 1:
The patent segments the scheduling function into two independent parts: a first DCI for scheduling a first PDSCH from a first TRP, and a second DCI for scheduling a second PDSCH from a second TRP. This segmentation allows each DCI to be processed independently while achieving diversity transmission, thus maintaining low device complexity while improving reliability through multi-TRP scheduling.
2Reliability
If multi-DCI method is used for PDSCH scheduling, then reliability is improved through diversity transmission, but device complexity increases
Solution Approach 1:
The patent extracts the scheduling function into separate, independent DCI messages for each TRP. Instead of using a complex multi-DCI system, it takes out only the necessary scheduling information for each PDSCH into individual DCI formats, reducing the overall complexity while maintaining the reliability benefits of multi-TRP diversity transmission.
3Device complexity
If TCI states are not properly managed, then device complexity is reduced, but beam management precision deteriorates leading to data loss
Solution Approach 1:
The patent applies preliminary action by configuring and activating TCI states before they are needed for PDSCH reception. The network configures a list of TCI states and activates them with activation commands that map TCI states to codepoints in advance. This allows the UE to have ready-to-use beam configurations, ensuring precise beam management without adding complex runtime processing.
Solution Approach 2:
The patent implements dynamic TCI state management where the network can activate different TCI states based on current channel conditions and scheduling requirements. The activation commands dynamically map TCI states to codepoints, allowing the system to adapt beam configurations in real-time while maintaining manageable complexity through standardized procedures.
Data Source
AI summary
Systems and methods for mixed signal Downlink Control Information (DCI) and multi-DCI for Physical Downlink Shared Channel (PDSCH) scheduling are disclosed. In one embodiment, a method performed by a User Equipment (UE) comprises receiving a configuration of first and second sets of Control Resource Sets (CORESETs), and a list of Transmission Configuration Indication (TCI) states for PDSCH. The method further comprises receiving first and second TCI activation commands associated to the respective sets of CORESETs. The method further comprises receiving first and second Physical Downlink Control Channels (PDCCHs) carrying first and second DCIs in first and second CORESETs from among the first and second sets of CORESETs, respectively, and receiving a first PDSCH(s) scheduled by the first DCI and a second PDSCH(s) scheduled by the second DCI, wherein the first and/or second DCI comprises a TCI codepoint that is mapped to two of the respective activated TCI states.