Joint Downlink-Uplink Scheduling for Low-Latency Data Transmission
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Solution Overview
Problem
Existing communication systems face high signaling overheads and latency issues in closed-loop data transmission, particularly in ultra-reliable low-latency communication (URLLC) scenarios, leading to compromised service quality.
Innovation Solution
Implement joint scheduling of downlink and uplink data channels using a single instruction on a downlink control channel, reducing the need for additional scheduling signaling by establishing a correspondence between downlink and uplink data channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PDCCH indication and scheduling is used for downlink and uplink data channels, then the terminal device can receive/send data correctly, but signaling overheads increase and communication latency increases
Solution Approach 1:
The patent combines separate PDCCH indication and scheduling operations into a unified joint scheduling mechanism. A single PDCCH carries both indication information (downlink data channel resource) and scheduling information (uplink data channel resource), merging two separate control functions into one integrated operation, thereby reducing signaling overhead while maintaining transmission reliability
Solution Approach 2:
The PDCCH is designed to perform multiple functions simultaneously: it serves as both an indication channel for downlink data resources and a scheduling channel for uplink data resources. This multi-functionality allows the system to reduce the number of separate control messages needed, lowering overall signaling overhead while ensuring correct data transmission
2Reliability
If separate PDCCH indication and scheduling is used for downlink and uplink data channels, then the terminal device can receive/send data correctly, but communication latency increases
Solution Approach 1:
By merging indication and scheduling into a single PDCCH operation, the patent eliminates the sequential processing delay that would occur with separate operations. The terminal device receives one unified control message instead of two separate messages, reducing the time required for control signal processing and thereby lowering communication latency while maintaining reliable data transmission
3Quantity of substance
If joint scheduling is implemented using single instruction, then signaling overheads are reduced and latency is lowered, but the complexity of resource correspondence management increases
Solution Approach 1:
The patent establishes predetermined correspondence relationships between downlink and uplink data channel resources before actual data transmission occurs. These resource associations are pre-configured and stored in the terminal device, allowing the joint scheduling operation to simply reference existing mappings rather than managing complex real-time resource allocations, thereby reducing operational complexity despite the integrated approach
Data Source
AI summary
A data transmission method includes obtaining indication information included on a downlink control channel. The indication information is useable to indicate a downlink data channel resource and an uplink data channel resource. The method further includes at least one of receiving data by the downlink data channel resource, or sending data by the uplink data channel resource.