Uplink Pre-Emption Signaling to Prevent Transmission Misalignment

Solution Overview

Problem

Existing wireless communication systems face misalignment issues due to cancelled transmissions, leading to inefficiencies in uplink throughput, energy consumption, and increased latency, particularly when higher priority communications need to preempt lower priority ones.

Innovation Solution

Implementing a pre-emption indication mechanism at the wireless device to cancel or delay scheduled transmissions, allowing for the storage of pre-empted transmission information and reducing the likelihood of misalignment by ensuring timely retransmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the wireless device cancels a scheduled transmission to send more urgent communications, then the transmission latency is reduced and energy efficiency is improved, but misalignment occurs between the wireless device and the base station

Engineering Contradiction:

Improvetransmission latencyVSAvoidalignment between wireless device and base station

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The base station sends a pre-emption indication to the wireless device before the scheduled transmission occurs, allowing the wireless device to proactively cancel or delay the transmission. This preliminary action prevents misalignment by ensuring both parties are aware of the cancellation before it happens, resolving the contradiction between reducing latency and maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pre-emption indication mechanism establishes a feedback loop where the base station informs the wireless device of upcoming pre-emption events. This feedback ensures the wireless device can adjust its transmission schedule accordingly, maintaining alignment between the device and base station while enabling timely cancellation of lower-priority transmissions

Inventive Principle:

Principle #23Feedback

2Productivity

If the wireless device cancels scheduled transmissions for higher priority communications, then uplink throughput is enhanced, but misalignment between wireless device and base station increases

Engineering Contradiction:

Improveuplink throughputVSAvoidalignment between wireless device and base station

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station sends a pre-emption indication to the wireless device before the scheduled transmission occurs, allowing the wireless device to proactively cancel or delay the transmission. This preliminary action prevents misalignment by ensuring both parties are aware of the cancellation before it happens, resolving the contradiction between reducing latency and maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pre-emption indication mechanism establishes a feedback loop where the base station informs the wireless device of upcoming pre-emption events. This feedback ensures the wireless device can adjust its transmission schedule accordingly, maintaining alignment between the device and base station while enabling timely cancellation of lower-priority transmissions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12556314B2Uplink signal control

Publication Date: 2026.02.17 COMCAST CABLE COMM LLC

AI summary

A base station may cancel or delay (e.g., pre-empt) a transmission from a wireless device by sending a pre-emption indication to the wireless device. Based on receiving the pre-emption indication, the wireless device may cancel the transmission, store an indication associated with the cancelled transmission, and/or store the cancelled transmission in a data buffer. The base station may request transmission of the data unit (e.g., at a later time) by transmitting another indication.