DCI-Only PDSCH Payload Size Indication for Lower Decoding Latency

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in resource allocation and increased latency due to the use of blind decoding for downlink control information (DCI) on physical downlink shared channels (PDSCH), particularly in DCI-only PDSCH communications, leading to unnecessary padding and reduced throughput.

Innovation Solution

The system determines and indicates a payload size for aggregated DCI in DCI-only PDSCH communications, allowing for efficient resource allocation by aligning DCI components and reducing blind decoding complexity, thereby optimizing resource use and minimizing latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If blind decoding is used for DCI on PDSCH, then device compatibility is maintained, but resource allocation efficiency deteriorates due to unnecessary padding

Engineering Contradiction:

Improvedevice compatibilityVSAvoidresource allocation efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent segments DCI transmission into two paths: traditional PDCCH blind decoding for compatibility, and a new indicated payload size method for efficiency. The network device indicates specific payload sizes to UEs, allowing precise resource allocation without padding when the indication method is used, while maintaining blind decoding capability for legacy devices.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic payload size indication where the network device can flexibly indicate different payload sizes (e.g., 32, 64, 128 bits) based on actual DCI content requirements. This dynamic adaptation eliminates the need for fixed-size padding while maintaining compatibility through multiple size options.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If blind decoding is used for DCI on PDSCH, then legacy device support is ensured, but latency increases due to decoding complexity

Engineering Contradiction:

Improvelegacy device supportVSAvoiddecoding latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by having the network device indicate the payload size before the UE performs decoding. This advance information allows the UE to directly allocate buffer and processing resources matching the actual DCI size, eliminating the need for exhaustive blind decoding attempts and reducing decoding latency significantly.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If padding is added to DCI payload, then transmission reliability is improved, but throughput decreases due to wasted resources

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidthroughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the payload size parameter from fixed with padding to dynamically indicated sizes. By indicating actual DCI payload sizes (32, 64, 128 bits) matching the content requirements, the system eliminates unnecessary padding while maintaining reliable transmission through precise size matching, thereby increasing effective throughput.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260052540A1Indication of payload size for downlink control information only physical downlink shared channel communication

Publication Date: 2026.02.19 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a physical downlink control channel (PDCCH) communication including first downlink control information (DCI) indicating a payload size of aggregated second DCI included in a DCI-only physical downlink shared channel (PDSCH) communication. The UE may receive the DCI-only PDSCH communication including the aggregated second DCI. Numerous other aspects are described.