Cross-Subframe Control Channel Design for Wireless Interference Reduction

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Solution Overview

Problem

In wireless communication systems, decoding of downlink control channels is challenging due to strong interference from neighboring cells, especially when control and data channels occupy the same subframe, leading to difficulties in resource allocation and data transmission.

Innovation Solution

Implementing a cross-subframe control channel design where control information is transmitted in a first subframe to allocate resources for a downlink data channel in a second subframe, reducing interference by coordinating timing between cells and allowing for separate subframe usage, thereby improving decoding accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If control channels and data channels occupy the same subframe, then system resources are utilized efficiently, but interference from neighboring cells increases making control channel decoding difficult

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidcontrol channel decoding reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the time domain by separating control channel transmission from data channel transmission across different subframes. The control channel is transmitted in a first subframe to allocate resources for a downlink data channel in a second subframe, effectively dividing the simultaneous transmission problem into sequential transmissions that avoid interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control channel transmits resource allocation information in advance (in the first subframe) before the actual data transmission occurs (in the second subframe). This preliminary action allows the receiver to prepare for data decoding while avoiding the interference problem of simultaneous control and data channel transmission.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If control information is transmitted in the same subframe as data channel, then timing coordination is simplified, but interference from neighboring cells degrades decoding accuracy

Engineering Contradiction:

Improvetiming coordination simplicityVSAvoidcontrol channel decoding accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent segments the transmission timeline into distinct subframes for control information and data channel, eliminating the interference that occurs when both are transmitted simultaneously in the same subframe while maintaining straightforward timing coordination through the standardized subframe structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary time separation mechanism where the control channel is transmitted in a first subframe and the data channel in a second subframe. This time-based intermediary structure allows the system to maintain coordination simplicity while protecting decoding accuracy by preventing direct interference between control and data signals.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11357035B2Cross-subframe control channel design

Publication Date: 2022.06.07 QUALCOMM INC

AI summary

Certain aspects of the disclosure relate to performing cross-subframe control channel signaling for wireless communications. A method may be provided for signaling downlink control channel resource allocations and/or physical control format indications in a subframe different from the subframe in which a downlink data transmission may be performed. In one aspect, the method may include transmitting PDCCH and/or PCFICH during a first subframe to allocate resources for a PDSCH during a second subframe and transmitting the PDSCH during the second subframe.