Low-Power Radio Uplink Scheduling for Reduced Main Radio Wake-Ups

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Solution Overview

Problem

Conventional UEs with low power radios (LRs) are incapable of UL transmissions, leading to frequent wake-ups of the main radio (MR) for UL data, resulting in significant latency and reduced power saving gains, especially for delay-sensitive services.

Innovation Solution

The LR is enabled to transmit UL data based on urgency and priority, allowing the MR to remain in a sleep mode, with LCH configuration and new BSR triggers to optimize power conservation and minimize latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the low power radio is used for uplink transmissions, then power saving gains are improved, but the main radio wake-up frequency increases causing latency

Engineering Contradiction:

Improvepower saving gainsVSAvoidlatency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent segments the uplink transmission functionality by introducing a wake-up radio (WUR) that handles specific control functions (scheduling requests, buffer status reports) separately from the main radio. This segmentation allows the main radio to remain in sleep mode longer, reducing wake-up frequency and latency while still enabling the low power radio to perform limited uplink transmissions for urgent data

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic radio mode selection where the system can switch between different operational states: WUR-only mode for non-urgent data, main radio wake-up for urgent data, and hybrid mode where both radios are active. This dynamic approach optimizes the balance between power saving and latency based on real-time traffic conditions

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If the main radio remains in sleep mode, then power consumption is reduced, but uplink transmission capabilities are limited

Engineering Contradiction:

Improvepower consumptionVSAvoiduplink transmission capabilities

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The wake-up radio is designed with multi-functionality to handle multiple uplink transmission types including scheduling requests, buffer status reports, and data transmissions. This universal capability within the low power radio reduces the need for main radio wake-ups while maintaining adequate uplink functionality for various scenarios

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes operational parameters by configuring specific logical channels and resource allocations for WUR operation. By adjusting parameters such as uplink grant configurations, logical channel priorities, and radio resource control settings, the system enables the low power radio to operate effectively within its capabilities while the main radio remains dormant

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250351078A1Uplink transmission using low power radio

Publication Date: 2025.11.13 LENOVO (SINGAPORE) PTE LTD

AI summary

Various aspects of the present disclosure relate to uplink transmission using a low power radio. An apparatus, such as a UE, receives uplink (UL) data into a medium access control (MAC) hybrid automatic repeat request (HARQ) buffer. The UE wakes up a low power radio of the UE based on the uplink data received in the MAC HARQ buffer. The UE initiates a buffer status report and/or a scheduling request, and the UE transmits, to a network equipment (NE), the buffer status report, the scheduling request, or both the buffer status report and the scheduling request.