Downlink Channel Access Switching for Low-Latency Terminal Points

Solution Overview

Problem

Existing wireless communication systems face challenges in achieving low latency in both uplink and downlink transmissions, particularly for battery-operated nodes that require reduced energy consumption and extended battery life, while maintaining high interference immunity.

Innovation Solution

Implementing a wireless communication system with a terminal point and base station that operate in two modes: a first mode with normal latency and a second mode with low latency, using channel access patterns to adjust transmission and reception based on a first channel access pattern, allowing for data transmission with reduced latency in the second mode by optimizing frequency and time hopping-based occupancy of resource elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the system uses a first channel access pattern for normal latency operation, then energy consumption is reduced and battery life is extended, but downlink latency increases to ten minutes or more

Engineering Contradiction:

Improveenergy consumptionVSAvoiddownlink latency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The system dynamically switches between two operational modes: a first mode using a first channel access pattern for energy-efficient normal latency operation, and a second mode using a second channel access pattern for low latency operation. This dynamic adaptation allows the system to optimize between energy consumption and latency based on application requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes key parameters including the channel access pattern, latency characteristics, and data rate when transitioning between the first and second modes. These parameter changes enable the system to achieve low latency with reduced energy consumption by utilizing a higher data rate in the second mode that reduces the number of resource elements needed.

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If the system uses a second channel access pattern for low latency operation, then downlink latency is reduced to less than one second, but energy consumption increases

Engineering Contradiction:

Improvedownlink latencyVSAvoidenergy consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The system dynamically switches between two operational modes: a first mode using a first channel access pattern for energy-efficient normal latency operation, and a second mode using a second channel access pattern for low latency operation. This dynamic adaptation allows the system to optimize between energy consumption and latency based on application requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes key parameters including the channel access pattern, latency characteristics, and data rate when transitioning between the first and second modes. These parameter changes enable the system to achieve low latency with reduced energy consumption by utilizing a higher data rate in the second mode that reduces the number of resource elements needed.

Inventive Principle:

Principle #35Parameter changes

3Loss of time

If the system uses synchronous downlink beacons in regular intervals, then downlink latency is reduced to 30 seconds to 5 minutes, but energy consumption increases due to continuous beacon reception

Engineering Contradiction:

Improvedownlink latencyVSAvoidenergy consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The system dynamically switches between two operational modes: a first mode using a first channel access pattern for energy-efficient normal latency operation, and a second mode using a second channel access pattern for low latency operation. This dynamic adaptation allows the system to optimize between energy consumption and latency based on application requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes key parameters including the channel access pattern, latency characteristics, and data rate when transitioning between the first and second modes. These parameter changes enable the system to achieve low latency with reduced energy consumption by utilizing a higher data rate in the second mode that reduces the number of resource elements needed.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260031852A1Terminal point and base station of a telegram splitting-based communication system with low latency in the downlink

Publication Date: 2026.01.29 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV

AI summary

Embodiments provide a terminal point of the wireless communication system, wherein the terminal point is configured to operate in a first mode and in a second mode, wherein the terminal point is configured to receive a signal, wherein the signal comprises information on a first channel access pattern for the first mode, wherein the terminal point is configured to determine the first channel access pattern for the first mode based on the information on the first channel access pattern, wherein the terminal point is configured to determine a second channel access pattern for the second mode based on the information on the first channel access pattern, wherein the terminal point is configured to transmit and/or receive data in the second mode by using the second channel access pattern, wherein the first channel access pattern for the first mode allows data transmission with a first latency, wherein the second channel access pattern for the second mode allows data transmission with a second latency, wherein the second latency is lower than the first latency.