Configured Grant Preamble Selection for Low-Latency Uplink Traffic

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Solution Overview

Problem

Existing wireless communications systems face inefficiencies in resource allocation for sporadic and low-latency uplink data transmissions due to bursty data traffic, leading to spectral inefficiencies and potential collisions.

Innovation Solution

A UE dynamically selects a configured grant configuration based on uplink data traffic and indicates the selection using a preamble, allowing for time-division or frequency-division multiplexed transmissions, enhancing spectral efficiency and reducing collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional grant-based resource allocation is used for uplink transmissions, then resource allocation can be controlled by the network, but spectral efficiency deteriorates for sporadic low-latency traffic due to bursty data patterns and potential collisions

Engineering Contradiction:

Improvespectral efficiencyVSAvoidcollision probability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The preamble pool is segmented into multiple subsets, where each subset is associated with a specific configured grant configuration. UEs select preambles from appropriate subsets based on their traffic characteristics, thereby segmenting the random access process to reduce collisions and improve spectral efficiency for sporadic low-latency traffic.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the parameter of preamble selection by introducing configured grant-specific preamble subsets. Instead of using a single unified preamble pool, the system modifies the preamble selection parameters to match specific grant configurations, enabling UEs to select from targeted subsets that reduce collision probability while maintaining spectral efficiency.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If dynamic resource allocation is implemented for sporadic traffic, then spectral efficiency improves, but system complexity increases due to multiple configured grant configurations

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidconfiguration management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Multiple configured grant configurations share a common preamble pool structure with organized subsets. Each configuration can utilize its designated preamble subset, creating a universal framework where the same preamble pool design serves multiple grant configurations simultaneously, reducing overall system complexity while enabling dynamic resource allocation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Preamble subsets are pre-configured and associated with specific configured grant configurations before actual data transmission occurs. This preliminary organization of preambles into subsets eliminates the need for dynamic preamble pool reconfiguration during operation, reducing system complexity while enabling efficient dynamic resource allocation for sporadic traffic.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If preambles are transmitted in dedicated random access channels, then collision probability reduces, but resource flexibility deteriorates for grant-free uplink transmissions

Engineering Contradiction:

Improvecollision reductionVSAvoidresource allocation flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system merges the benefits of dedicated random access channels with grant-free uplink transmissions by organizing preambles into configured grant-specific subsets within the random access channel structure. This combination maintains the collision-reducing advantage of dedicated resources while preserving the flexibility of grant-free transmissions through proper preamble selection from appropriate subsets.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20260020028A1Enhancing grant-free uplink transmission for low latency traffic

Publication Date: 2026.01.15 LENOVO UNITED STATES INC

AI summary

Various aspects of the present disclosure relate to enhancements for Type 1 configured grant transmissions. For example, a user equipment (UE) may select or choose a configured grant configuration (CG-config) that dynamically accommodates its uplink data traffic. The UE may indicate the selected CG-config to a network entity using a preamble, such as by transmitting the preamble in advance of or preceding uplink transmissions over selected resources associated with the CG-config (e.g., within a preamble occasion occupying a slot before the uplink transmission). In some cases, the UE may transmit the preamble in a frequency division multiplexing (FDM) manner and/or time division multiplexing (TDM) manner.