PDCCH Blind Detection Reduction via Control Information Association
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Solution Overview
Problem
In full-duplex wireless communication systems, the accurate reporting of uplink control information (UCI) is crucial to stabilize system performance, but it is often interfered by downlink data, leading to incorrect interpretation, resource wastage, and scheduling errors, which reduce throughput.
Innovation Solution
A detecting method for the physical downlink control channel (PDCCH) that reduces the maximum number of blind detections required for acquiring downlink control information, by associating the location of the PDCCH carrying the second downlink control information with related information of the first downlink control information, or by carrying both on the same PDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink control information is transmitted on the same time-frequency resource as downlink data, then resource utilization is improved, but the uplink control information is interfered by downlink data leading to incorrect interpretation and scheduling errors
Solution Approach 1:
The patent segments the time-frequency resources by dividing them into separate first time-frequency resources for uplink control information and second time-frequency resources for downlink data. This segmentation prevents interference between the two types of transmissions while maintaining high resource utilization through coordinated scheduling.
Solution Approach 2:
The patent introduces a coordination mechanism as an intermediary between uplink control information transmission and downlink data transmission. The base station coordinates the scheduling of these two transmissions to avoid simultaneous occupation of the same resources, thereby preventing interference while maintaining efficient resource utilization.
2Reliability
If the user equipment performs blind detection on multiple PDCCH candidates to acquire downlink control information, then the reliability of acquiring control information is improved, but the processing complexity and time consumption increase
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure downlink control information for both uplink scheduling grant and downlink scheduling on the same PDCCH before transmission. This allows the user equipment to acquire both control information in a single detection operation, eliminating the need for multiple blind detections and reducing processing complexity.
Solution Approach 2:
The patent merges two separate downlink control information transmissions into a single PDCCH structure. Instead of requiring the user equipment to detect separate PDCCH candidates for uplink and downlink scheduling, the base station combines both control information into one transmission, significantly reducing the number of blind detections required.
Data Source
AI summary
A method includes performing blind detection on a PDCCH in at least one subframe or slot to acquire first downlink control information and second downlink control information; and performing uplink data transmission and downlink data transmission with a base station according to the acquired first downlink control information and second downlink control information, wherein the first downlink control information is one of downlink control information for uplink scheduling grant and downlink control information for downlink scheduling, and the second downlink control information is the other one of the downlink control information for uplink scheduling grant and the downlink control information for downlink scheduling, and wherein a location where a PDCCH carrying the second downlink control information is detected is associated with related information of the first downlink control information, or the first downlink control information and the second downlink control information are carried on the same PDCCH.