PBCH Resource Mapping for Incomplete Narrowband SSB Reception

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Solution Overview

Problem

In dedicated narrowband networks with limited bandwidth, network devices struggle to completely send synchronization signal broadcast blocks (SSBs), leading to incomplete PBCH transmission, which requires additional resource indication, increasing transmission overhead.

Innovation Solution

A method to determine and indicate the frequency domain resource mapping position of the PBCH without additional signaling by associating it with channel, transmission, or maximum transmission bandwidth, using synchronization signals and DMRS signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the network device sends an incomplete SSB in a dedicated narrowband network, then the terminal device can receive the SSB in limited bandwidth, but additional transmission resources are occupied to indicate the frequency domain resource mapping position

Engineering Contradiction:

Improveadaptability to narrowband networksVSAvoidtransmission resource consumption

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent applies universality by making the frequency domain resource mapping position of the PBCH follow the same determination rule as the SSB frequency position. This allows the system to universally apply the same resource allocation principle across different bandwidth scenarios, eliminating the need for separate indication mechanisms for narrowband networks while maintaining adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent implements self-service by enabling the terminal device to autonomously determine the PBCH frequency domain resource mapping position based on the detected SSB frequency position and predefined association rules. This eliminates the need for the network device to explicitly indicate the resource position, allowing the terminal to self-configure the reception parameters without additional signaling overhead.

Inventive Principle:

Principle #25Self-service

2Reliability

If the network device indicates the frequency domain resource mapping position of the incomplete SSB, then the terminal device can correctly receive the PBCH, but additional signaling exchange occupies transmission resources

Engineering Contradiction:

Improvecorrect reception of PBCHVSAvoidtransmission resource consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The terminal device self-determines the PBCH frequency domain resource mapping position by detecting the SSB frequency position and applying predefined association rules. This self-service mechanism ensures reliable PBCH reception while eliminating the need for additional network signaling, thereby reducing transmission resource consumption.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent establishes preliminary association rules between SSB frequency position and PBCH resource mapping position before transmission. These pre-defined rules enable the terminal to predict the PBCH location based on SSB detection, ensuring correct reception without requiring real-time indication signaling from the network device.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the PBCH occupies fewer than 20 RBs in frequency domain, then the SSB can be transmitted in dedicated narrowband networks, but the frequency domain resource mapping position must be indicated to the terminal device

Engineering Contradiction:

Improvesupport for narrowband networksVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by establishing a unified determination rule that works for both complete (20 RBs) and incomplete (fewer than 20 RBs) SSB scenarios. The PBCH frequency domain resource mapping position is universally determined by the SSB frequency position regardless of bandwidth size, eliminating the need for separate indication mechanisms and reducing signaling overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent utilizes parameter changes by linking the PBCH resource allocation parameters directly to the SSB frequency position parameter. When the SSB frequency position changes, the PBCH resource mapping position automatically adjusts according to the association rule, enabling adaptive support for different bandwidth configurations without complex signaling.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260067989A1Resource indication method and communication apparatus

Publication Date: 2026.03.05 HUAWEI TECH CO LTD

AI summary

This application provides a resource indication method and a communication apparatus. The method includes: determining a first frequency position of a first synchronization signal and physical broadcast channel block SSB, where the first SSB includes a first physical broadcast channel PBCH, and the first frequency position is associated with a first frequency domain resource mapping position of the first PBCH. A terminal device may determine the first frequency domain resource mapping position of the first PBCH based on an association relationship between the first frequency position and the first frequency domain resource mapping position, to correctly receive the first PBCH.