RedCap Random Access Signaling for Balanced 5G NR Capability

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently supporting reduced capability (redcap) devices, such as industrial wireless sensors and wearables, due to their lower bandwidth, half-duplex operation, and other complexity reduction features, which can lead to imbalances in power consumption, cost, and network performance.

Innovation Solution

Implementing techniques for redcap devices to explicitly identify themselves during a random access procedure, using dedicated resources and early indications, such as repurposed system information blocks and PRACH resource sets, to balance power consumption, cost reduction, and network performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If redcap devices use lower bandwidth and half-duplex operation to reduce cost and complexity, then device cost and complexity are reduced, but network performance and power efficiency deteriorate

Engineering Contradiction:

Improvedevice complexityVSAvoidnetwork performance

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent segments the random access procedure into distinct phases with dedicated resources for redcap devices. Separate PRACH resource sets are allocated specifically for redcap devices, allowing them to access the network without competing with full-capability devices. This segmentation enables optimized performance for redcap devices while maintaining overall network efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements early indication mechanisms where redcap devices identify their device type during the initial random access procedure, before full connection establishment. System Information Blocks (SIBs) are configured in advance with parameters optimized for redcap devices, allowing the network to prepare appropriate resource allocation and configuration before the device fully connects.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If redcap devices transmit during random access procedure to indicate device type, then network can optimize resource allocation, but power consumption increases

Engineering Contradiction:

Improvenetwork resource optimizationVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent enables redcap devices to indicate their device type during the early random access phase, allowing the network to optimize resource allocation before full data transmission begins. This preliminary indication mechanism allows the network to configure appropriate parameters and resources specifically for redcap devices, improving overall resource efficiency while minimizing the duration and power cost of indication transmissions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Redcap devices autonomously identify and indicate their device type during the random access procedure without requiring additional network signaling or configuration. The devices use dedicated PRACH resources and uplink messages to self-identify, enabling the network to automatically apply appropriate configurations without manual intervention or additional overhead.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12526726B2Enhancements for reduced capability new radio devices

Publication Date: 2026.01.13 APPLE INC

AI summary

A user equipment (UE) is configured to receive a system information block (SIB) from a base station and transmit an indication of a reduced capability (redcap) device type to the base station during a random access procedure, wherein the indication is associated with a UE configuration comprising one or more UE complexity reduction features.