Downlink Transmission Resources for Low-Latency URLLC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current downlink transmission methods in communications systems fail to meet the latency requirements for ultra-reliable and low-latency communications, particularly in scenarios like vehicle-to-vehicle services, due to high transmission latency and unreliability.
Innovation Solution
The method involves specifying multiple downlink transmission resources for simultaneous data block transmission, using time division, frequency division, or space division, and indicating these resources to the terminal device through signaling, allowing the device to combine signal gains and improve bit error performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink data is transmitted using conventional scheduling methods, then transmission reliability can be maintained through retransmission, but transmission latency increases due to sequential scheduling and retransmission processes
Solution Approach 1:
The network device pre-allocates multiple downlink transmission resources (time, frequency, or space domains) to the terminal device before data transmission. When downlink data arrives, the network device directly transmits data blocks on these pre-configured resources without requiring scheduling requests or sequential allocation, thereby reducing transmission latency while maintaining reliability through redundant resource paths
Solution Approach 2:
The downlink transmission resources are segmented into multiple independent channels across time, frequency, and space domains. Each segment can independently carry data blocks, allowing parallel transmission and reducing overall latency. If one segment fails, other segments provide redundant transmission paths for retransmission without affecting the entire system
2Loss of time
If multiple transmission resources are allocated for simultaneous data transmission, then transmission latency is reduced, but resource consumption and system complexity increase
Solution Approach 1:
Multiple downlink transmission resources are pre-configured and allocated to the terminal device in advance through signaling. This preliminary allocation simplifies the real-time transmission process by eliminating the need for dynamic scheduling decisions during data transmission, reducing both latency and real-time system complexity
Solution Approach 2:
The pre-allocated transmission resources serve multiple functions: they provide parallel transmission paths for reduced latency, redundant paths for reliability, and can be dynamically selected based on channel conditions. This multi-functionality justifies the resource allocation while achieving multiple performance goals simultaneously
3Quantity of substance
If conventional downlink scheduling is used with single resource allocation, then resource efficiency is maintained, but transmission reliability and latency requirements for URLLC cannot be met
Solution Approach 1:
Downlink transmission resources are segmented into multiple independent channels across time, frequency, and space domains. Each segment can independently transmit data blocks, providing diverse transmission paths that improve reliability for URLLC services while maintaining overall resource efficiency through structured allocation
Solution Approach 2:
The system changes the allocation parameters from single-resource sequential scheduling to multi-resource parallel allocation. By adjusting the number and distribution of allocated resources across different domains, the system optimizes both reliability for critical services and efficiency for overall resource utilization
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(e)
AI summary
The present invention discloses a downlink transmission method and an apparatus. The method includes: sending, by a network side device, a signaling indication to a terminal device UE, where the signaling indication carries allocation information, and the allocation information is used to indicate a plurality of downlink transmission resources used to transmit data blocks. The method and apparatus disclosed in the present invention resolve a problem that a downlink transmission manner in the prior art cannot meet a latency requirement of ultra-reliable and low-latency communications.