Dynamic Scheduling via Independent Channel Coding on RE Subsets
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Solution Overview
Problem
In wireless communication systems, particularly in New Radio (NR) scenarios with high-frequency and massive-antenna deployments, the existing methods for transmitting Physical Downlink Control Channel (PDCCH) increase the complexity of blind detections for User Equipment (UE) due to the need to perform multiple blind detections across multiple Beam Pair Links (BPLs, which can degrade transmission robustness.
Innovation Solution
The proposed solution involves using independent channel coding on distinct Resource Element (RE) subsets within candidate resources, allowing for the transmission of Downlink Control Information (DCI) across multiple BPLs without increasing the number of blind decodings, by employing polar coding and specific RE subset configurations that enable soft combination before channel decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple blind detections are performed on multiple BPLs to improve transmission robustness, then the detection rate and robustness of DCI transmission are improved, but the complexity of blind detections and the number of blind detections required are increased
Solution Approach 1:
The candidate resources are segmented into first RE subsets and second RE subsets, where each subset carries independently channel-coded DCI. This segmentation allows the UE to perform blind detection on one subset without needing to decode the entire resource, reducing the complexity of each individual detection attempt while maintaining robustness through multiple candidates.
Solution Approach 2:
The patent changes the parameter of code length by using different code lengths for the first and second RE subsets. This allows flexible adaptation of the coding rate and redundancy level for each subset, enabling the system to optimize between robustness and detection complexity by adjusting the coding parameters rather than simply increasing the number of blind detections.
2Reliability
If repeated transmission of DCI on multiple BPLs is performed to improve transmission reliability, then the robustness of DCI transmission is improved, but the number of blind detections performed by the UE is increased
Solution Approach 1:
By segmenting the DCI transmission into multiple RE subsets that can be independently decoded, the patent reduces the number of full blind detections required. The UE can successfully decode DCI from one subset without needing to attempt decoding of all repeated transmissions, thereby reducing the effective number of blind detections while maintaining transmission reliability through the segmented structure.
Solution Approach 2:
The patent applies preliminary channel coding to each RE subset before transmission. This preliminary action ensures that each subset is self-contained and can be independently decoded, allowing the UE to stop blind detections once one subset is successfully decoded, rather than needing to attempt all repeated transmissions.
3Device complexity
If independent channel coding on distinct RE subsets is used to reduce blind detection complexity, then the number of blind detections is reduced, but the coding overhead and resource utilization may increase
Solution Approach 1:
The patent uses different code lengths for the first and second RE subsets, allowing flexible adjustment of the coding overhead. By optimizing the code length parameters, the system can reduce the coding overhead while still providing sufficient redundancy for reliable decoding, thereby balancing blind detection complexity reduction with resource efficiency.
Solution Approach 2:
The patent combines multiple coded DCI transmissions into a single transport block structure where first and second RE subsets carry different channel-coded versions of the same DCI. This merging approach allows the UE to benefit from multiple coding attempts without the full overhead of completely separate transmissions, as the subsets share the same underlying information structure.
Data Source
AI summary
The disclosure provides a method in a User Equipment (UE) and a base station for dynamic scheduling. The UE receives first information for determining X1 candidate resources and monitors second information that may occupy one of the X1 candidate resources. A first candidate resource is one of the X1 candidate resources. The first candidate resource includes a first Resource Element (RE) subset and a corresponding second RE subset. A time-frequency resource occupied by the second RE subset is related to a time-frequency resource occupied by the first RE subset. If the first candidate resource is occupied by the second information, the first RE subset and the corresponding second RE subset carry the outputs of two times of independent channel coding of the second information respectively. The number of REs included in the first RE subset is different from the number of REs included in the corresponding second RE subset.