Multi-Cell DCI Scheduling with CRC Scrambling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing control signaling overhead and HARQ-ACK feedback delay, particularly in scheduling uplink and downlink data for multiple serving cells, which affects system performance and user experience.
Innovation Solution
A method involving a terminal and a base station that receives and transmits downlink control information (DCI) and physical downlink shared channels (PDSCHs) across multiple cells, with cyclic redundancy check (CRC) scrambling using cell radio network temporary identifiers (C-RNTI) or modulation coding scheme (MCS)-C-RNTI, to optimize time domain resource allocation and HARQ-ACK feedback timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate DCI messages are transmitted for scheduling PDSCHs on multiple cells, then each cell can be scheduled independently, but control signaling overhead increases
Solution Approach 1:
The patent combines multiple separate DCI messages into a single unified DCI message that schedules PDSCHs across multiple cells simultaneously. This single DCI contains resource allocation information for multiple cells, reducing the number of control messages transmitted while maintaining the ability to independently schedule each cell's resources.
Solution Approach 2:
The unified DCI message structure is designed to serve multiple cells with different configurations through flexible field interpretations. The same DCI message can accommodate different numerologies, resource allocations, and scheduling parameters for each scheduled cell, making it a universal scheduling mechanism that replaces multiple cell-specific DCI messages.
2Ease of operation
If HARQ-ACK feedback timing is fixed, then system operation is simplified, but feedback delay cannot be dynamically optimized
Solution Approach 1:
The patent introduces dynamic HARQ-ACK feedback timing where the feedback delay can be adjusted based on system conditions, traffic requirements, and cell-specific parameters. The DCI message includes timing indication fields that allow the base station to flexibly configure the timing between PDSCH reception and HARQ-ACK transmission, optimizing feedback delay for different service types and channel conditions while maintaining manageable complexity through standardized procedures.
3Adaptability or versatility
If separate DCI messages are used for each cell, then scheduling flexibility is maintained, but resource allocation efficiency decreases
Solution Approach 1:
The patent merges resource allocation information for multiple cells into a single DCI message, enabling the base station to allocate resources across cells in a coordinated manner. This allows for more efficient utilization of available resources by considering inter-cell dependencies and avoiding redundant allocations, while the flexible DCI structure maintains the ability to adapt to different scheduling requirements for each cell.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system is provided. The method includes receiving, from a base station on a first cell, first downlink control information (DCI) for scheduling multiple physical downlink shared channels (PDSCHs) on first multiple cells and receiving, from the base station, the multiple PDSCHs on the first multiple cells based on the first DCI. at least one CRC of the first DCI is scrambled with at least one of a cell radio network temporary identifier (C-RNTI) or a modulation coding scheme (MCS)-C-RNTI