Downlink Control Information Transmission in PDSCH

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Solution Overview

Problem

In 5G NR communication systems, user equipment (UE) consumes more power due to frequent monitoring for physical downlink control channels (PDCCHs) at higher frequencies, especially in the millimeter wave band, as a result of reduced slot duration, leading to increased power consumption for blind decoding of downlink control information (DCI) messages.

Innovation Solution

Transmitting DCI messages within a physical downlink shared channel (PDSCH) instead of PDCCH, where a scheduling DCI message indicates resource allocation for a subsequent PDSCH, allowing for reduced blind decoding and power consumption by including multiple individual DCI messages without padding bits or truncation, and supporting new types of DCI messages not configured for PDCCH transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If UEs monitor for PDCCHs and DCI messages more frequently at higher frequencies due to reduced slot duration, then downlink control information can be received timely, but power consumption increases due to blind decoding

Engineering Contradiction:

Improveslot durationVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent extracts DCI messages from the PDCCH channel and places them within the PDSCH data channel. By moving control information transmission to a different channel (PDSCH), the system reduces the need for frequent blind decoding operations on PDCCH, thereby lowering UE power consumption while maintaining timely control information delivery

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The PDSCH channel is given dual functionality: it continues to carry data transmissions while also carrying DCI messages. This multi-functionality allows control information to be transmitted through an existing channel infrastructure, reducing the need for separate control channel monitoring and associated power consumption

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If multiple individual DCI messages are transmitted within PDSCH, then information transmission efficiency improves, but message size requirements increase

Engineering Contradiction:

Improveinformation transmission efficiencyVSAvoidmessage size

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent combines multiple individual DCI messages into a single aggregated DCI message transmitted within the PDSCH. This merging approach improves transmission efficiency by reducing the number of separate transmissions and associated overhead, while the combined message size is managed through efficient packing and formatting of the aggregated control information

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11653358B2Downlink control information transmission within a physical downlink shared channel

Publication Date: 2023.05.16 QUALCOMM INC

AI summary

This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, for wireless communication. In one aspect of the disclosure, a method of wireless communication performed by a user equipment (UE) includes receiving, from a base station, a scheduling downlink control information (DCI) message in a physical downlink control channel (PDCCH). The scheduling DCI message indicates a resource allocation for a scheduled DCI message in a subsequent physical downlink shared channel (PDSCH). The method further includes receiving, from the base station, the scheduled DCI message within the subsequent PDSCH. Other aspects and features are also claimed and described.