Multi-TTI DCI Scheduling for Overlapping PDSCH Timing
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Solution Overview
Problem
The issue with 5G NR wireless systems is that Downlink Control Information (DCI) formats can schedule multiple Physical Downlink Shared Channels (PDSCHs) or Physical Uplink Shared Channels (PUSCHs) with separate transport blocks, but existing solutions fail to address the issue of overlapping time spans when multiple DCIs end at the same symbol, leading to inefficiencies and undefined behaviors, which can cause overlapping time spans, resulting in invalid scheduling.
Innovation Solution
The proposed solution involves the UE checking the timing relations of PDSCHs scheduled by multiple DCIs ending at the same symbol, identifying valid or invalid combinations, and adjusting decoding attempts accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCI formats are used to schedule multiple PDSCHs or PUSCHs with separate transport blocks, then scheduling flexibility and resource utilization are improved, but overlapping time spans occur when multiple DCIs end at the same symbol, leading to undefined behaviors and scheduling invalidity
Solution Approach 1:
The patent applies preliminary action by establishing scheduling restrictions and timing relation checks before executing the scheduling. The UE checks whether multiple DCIs ending at the same symbol schedule PDSCHs with overlapping time spans, and identifies valid or invalid combinations in advance. This prevents scheduling conflicts before they occur, ensuring that only non-overlapping PDSCHs are decoded, thus maintaining scheduling validity while preserving flexibility.
2Productivity
If multiple DCI formats schedule multiple PDSCHs or PUSCHs simultaneously, then throughput and resource utilization are improved, but undefined behaviors and errors occur due to overlapping time spans
Solution Approach 1:
The patent converts the potentially harmful overlapping time spans into a beneficial scheduling mechanism. By defining specific timing relations and identifying valid combinations of DCIs, the system transforms what would be error-prone overlapping schedules into a structured approach where overlaps are detected and managed. This allows the system to maintain high throughput by scheduling multiple channels while converting the harmful overlapping effect into a controlled scheduling decision process.
3Productivity
If DCI formats schedule multiple PDSCHs or PUSCHs with separate transport blocks, then resource utilization is improved, but complexity increases in managing timing relations and decoding attempts
Solution Approach 1:
The patent applies segmentation by dividing the scheduling management into distinct segments: DCI reception, timing relation checking, overlapping detection, and decoding attempt identification. Each segment handles a specific aspect of the scheduling process, making the overall complex task manageable. The UE checks timing relations for each DCI separately, identifies overlapping time spans segment by segment, and determines valid combinations through systematic analysis, thereby reducing the perceived complexity while maintaining high resource utilization.
Data Source
AI summary
A user equipment (UE) configured for operation in a fifth-generation new radio (5G NR) system may be configured for multi physical downlink shared channel (PDSCH) scheduling and may decode a first downlink control information (DCI) and a second DCI received from a gNodeB (gNB). The first DCI may schedule multiple PDSCHs and the second DCI may schedule one or more PDSCHs. The UE may check the timing relations of the scheduled PDSCHs for validity when the first DCI and the second DCI end at a same symbol. When the multiple PDSCHs scheduled by the first DCI and the one or more PDSCHs scheduled by the second DCI are determined to have overlapping time spans, the UE may identify all the PDSCHs scheduled by the first DCI the second DCI as invalid.


