Autonomous Uplink Cancellation for Full-Duplex Interference

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Solution Overview

Problem

Current wireless communication systems, particularly in full-duplex or flexible-duplex modes, face challenges in protecting downlink reception due to overlapping uplink and downlink transmissions, leading to interference and reduced reliability.

Innovation Solution

Implementing autonomous uplink cancellation techniques in user equipment (UE) that determine, based on conditions such as transmission priority and configuration parameters, whether to cancel overlapping uplink transmissions to ensure proper downlink reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If full-duplex or flexible-duplex modes are used to enable simultaneous uplink and downlink transmissions, then spectral efficiency and communication capacity are improved, but interference between overlapping transmissions increases and downlink reception reliability deteriorates

Engineering Contradiction:

Improvespectral efficiencyVSAvoiddownlink reception reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent extracts and removes the harmful uplink transmission signal during periods when downlink reception is scheduled, by autonomously canceling the uplink transmission in the user equipment. This separation eliminates the interference between simultaneous uplink and downlink transmissions, allowing the system to maintain full-duplex operational capacity while protecting downlink reception reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements dynamic transmission mode switching where the user equipment can transition between full-duplex operation and autonomous uplink cancellation based on scheduling conditions. The system dynamically adjusts the transmission strategy by evaluating overlap conditions between uplink and downlink transmissions, enabling flexible adaptation to maintain both spectral efficiency and reception reliability.

Inventive Principle:

Principle #15Dynamics

2Reliability

If uplink transmission power is increased to improve uplink communication quality, then uplink signal strength is improved, but interference to downlink reception increases

Engineering Contradiction:

Improveuplink communication qualityVSAvoidinterference to downlink reception

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful interference effect of uplink transmission into a beneficial outcome by strategically canceling uplink transmissions during downlink reception periods. The system uses the knowledge of scheduled downlink receptions to proactively eliminate uplink transmissions that would cause interference, thereby protecting downlink reception quality while maintaining overall system performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies preliminary anti-action by preemptively canceling uplink transmissions before they can interfere with scheduled downlink receptions. The user equipment evaluates the schedule in advance and autonomously determines when to cancel uplink transmissions to prevent interference from occurring in the first place, rather than attempting to mitigate interference after it occurs.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If autonomous uplink cancellation is implemented to protect downlink reception, then downlink reception reliability is improved, but uplink transmission productivity decreases

Engineering Contradiction:

Improvedownlink reception reliabilityVSAvoiduplink transmission throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies partial action by selectively canceling only those portions of uplink transmissions that overlap with downlink reception periods, rather than canceling all uplink transmissions continuously. This approach protects downlink reception reliability while minimizing the impact on uplink transmission productivity by maintaining uplink transmissions during non-overlapping periods.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system uses scheduling information and transmission status feedback to make intelligent decisions about when to cancel uplink transmissions. The user equipment receives scheduling assignments and autonomously determines cancellation decisions based on the overlap between uplink and downlink transmissions, optimizing the balance between downlink protection and uplink productivity.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11805514B2Autonomous uplink cancellation

Publication Date: 2023.10.31 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for autonomous uplink (UL) cancellation. A method that may be performed by a user equipment (UE) includes receiving one or more configurations scheduling a communication with at least one base station (BS), wherein the one or more configurations schedule a UL transmission and a DL transmission such that the UL transmission and the DL transmission overlap in a time domain, determining whether to cancel at least a portion of the UL transmission based on one or more conditions associated with the UL transmission or the DL transmission, wherein the determination of whether to cancel at least the portion of the UL transmission is in response to the UL transmission and the DL transmission overlapping in the time domain, and performing the communication based on the determination, in accordance with aspects of the present disclosure.