DCI Blind Detection Complexity Reduction via Amount Indication
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Solution Overview
Problem
In 5G communications systems, the complexity of blind detection performed by user equipment (UE) is high due to the need to detect multiple downlink control information (DCI) from multiple base stations within a single scheduling period, leading to increased transmission latency and potential neglect of some DCI.
Innovation Solution
The base station sends amount indication information to the UE, indicating the maximum number of downlink control information, allowing the UE to optimize its blind detection process and stop once the indicated amount is detected, reducing the complexity of blind detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs blind detection on all CCEs in the common search space and UE-specific search space to receive DCI from multiple base stations, then the UE can receive all scheduling information, but the complexity of blind detection becomes relatively high
Solution Approach 1:
The base station performs preliminary action by determining the maximum number of DCIs in advance and notifying the UE of this information before the UE performs blind detection. This allows the UE to optimize its detection process by stopping once the indicated number of DCIs are detected, rather than exhaustively searching all CCEs, thus reducing detection complexity while ensuring complete DCI reception.
2Reliability
If the UE performs exhaustive blind detection on all CCEs to ensure all DCI is received, then all scheduling information is captured, but transmission latency increases due to the extensive detection process
Solution Approach 1:
The base station provides preliminary information about the maximum number of DCIs before the UE starts detection. This enables the UE to perform targeted blind detection with a predetermined stopping criterion, significantly reducing the time required for detection while maintaining complete DCI reception by ensuring all scheduled DCIs are captured within the indicated limit.
3Reliability
If the UE performs extensive blind detection to receive all DCI from multiple base stations, then complete scheduling information is obtained, but some DCI may become invalid due to transmission latency
Solution Approach 1:
The base station performs preliminary action by notifying the UE of the maximum number of DCIs before detection begins. This time-critical notification enables the UE to complete blind detection faster, ensuring that all received DCI remains within its validity period and does not become outdated due to prolonged detection latency, thus maintaining scheduling information accuracy.
Data Source
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AI summary
This application discloses an information transmission method, apparatus, and system, and belongs to the field of communications technologies. The method includes: generating, by a base station, amount indication information, where the amount indication information is used to indicate a maximum amount of downlink control information; sending, by the base station, the amount indication information to user equipment; receiving, by the user equipment, the amount indication information; and receiving, by the user equipment, downlink control information based on the amount indication information. In this application, the amount indication information is sent to the user equipment, so that the user equipment receives the downlink control information based on the amount indication information. This can resolve a problem that complexity of blind detection performed by the user equipment is relatively high, thereby reducing the complexity of the blind detection performed by the user equipment.