Channel Scrambling Initialization for Common and UE-Specific Signals

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Solution Overview

Problem

In wireless communication networks, common RNTIs used for messages targeting multiple devices cannot be delivered effectively due to differing configured identifiers, leading to inefficiencies in scrambling and reference signal generation.

Innovation Solution

A method and apparatus that utilize configurable identifiers for pseudo-random sequence initialization, allowing for wireless-device-specific identifiers when configured, and default cell identifiers otherwise, to enhance scrambling and reference signal generation in downlink messages and signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If configurable identifiers (nID, nSCID) are used for scrambling initialization in downlink messages, then device-specific customization is improved, but common messages targeting multiple devices cannot be delivered effectively

Engineering Contradiction:

Improvedevice-specific identifier configurationVSAvoidcommon message delivery

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system dynamically selects between device-specific identifiers and common identifiers based on the message type and device configuration state. When a device has configured nID/nSCID values, those are used for dedicated messages; otherwise, common identifiers are used for broadcast messages, enabling flexible adaptation to different communication scenarios

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The identifier parameter used for scrambling initialization changes based on configuration conditions. The system transitions between using device-specific parameters (nID, nSCID) and common parameters (cell ID, RNTI) depending on whether the device has been configured with specific identifiers, allowing the same scrambling mechanism to serve both dedicated and common messaging needs

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If device-specific identifiers are configured for each UE, then scrambling customization is improved, but complexity increases due to multiple identifier management

Engineering Contradiction:

Improvescrambling customizationVSAvoididentifier management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The identifier management system serves multiple functions: it handles both device-specific identifier configuration and common identifier fallback, manages both dedicated and common messaging scenarios, and provides a unified interface for scrambling initialization. This multi-functionality reduces the need for separate management mechanisms for different message types

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system automatically determines whether to use device-specific or common identifiers based on the device's configuration state without requiring explicit external control. The UE autonomously selects the appropriate identifier type based on whether nID/nSCID are configured, reducing signaling overhead and management complexity

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250358156A1Scrambling of physical channels and reference signals in wireless communication networks

Publication Date: 2025.11.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Radio network nodes, wireless devices, and related methods are provided in which a pseudo-random sequence initialization value, which is used during the generation of pseudo-random and/or scrambling sequences, is based, at least in part, on a first identifier, wherein the first identifier is equal to a first parameter if the first parameter has been configured and if a second identifier corresponds to a wireless-device-specific identifier.