SIB1 Transmission Optimization in MTC Systems

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Solution Overview

Problem

In Machine Type Communication (MTC) systems, there is a challenge in reducing interference caused by System Information Block (SIB) transmission between adjacent cells, particularly due to limited extra bits in Master Information Block (MIB) signaling and potential conflicts with Physical Broadcast Channel (PBCH) transmission.

Innovation Solution

A method and device for determining a subframe set and narrowband for SIB1 transmission based on Physical Cell Identity (PCID), which includes acquiring candidate subframes and narrowbands, and using independent configuration signaling to optimize SIB1 transmission, thereby minimizing interference with adjacent cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If SIB1 transmission scheduling is indicated through MIB signaling, then transmission flexibility is improved, but signaling overhead increases beyond the limited MIB bit capacity

Engineering Contradiction:

Improvetransmission flexibilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The scheduling information for SIB1 transmission is segmented into two parts: fixed predefined parameters (subframe position, narrowband position) and variable parameters (Transmission Block Size) indicated through MIB signaling. This segmentation allows the majority of scheduling information to be predetermined while only essential variable parameters consume MIB bits, resolving the contradiction between transmission flexibility and signaling overhead.

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If SIB1 transmission resources are predefined, then MIB signaling overhead is reduced, but interference between adjacent cells increases

Engineering Contradiction:

Improvesignaling overheadVSAvoidinterference between adjacent cells

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by allowing different cells to use different predefined scheduling configurations for SIB1 transmission. Each cell can be configured with specific subframe positions, narrowband positions, and transmission parameters tailored to its local interference environment, thereby reducing signaling overhead while mitigating interference through localized optimization.

Inventive Principle:

Principle #3Local quality

3Device complexity

If SIB1 transmission uses fixed subframe and narrowband positions, then UE blind detection complexity is reduced, but transmission reliability decreases due to persistent interference

Engineering Contradiction:

ImproveUE blind detection complexityVSAvoidtransmission reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces dynamics by enabling SIB1 transmission to switch between fixed predefined resources and dynamically indicated resources through MIB signaling. This allows the system to adapt resource allocation based on interference conditions while maintaining predefined fallback options, thereby improving transmission reliability without significantly increasing UE blind detection complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10700843B2Method and device for information transmission in machine-type communication system

Publication Date: 2020.06.30 ZTE CORP

AI summary

Provided are a method and device for information transmission in a Machine Type Communication (MTC) system. The method includes that: a subframe set and a narrowband for transmitting first information are determined according to a Physical Cell Identity (PCID); and the first information is sent or received on the subframe set and the narrowband.