MIB Message Configuration for SIB1 Interference Isolation
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Solution Overview
Problem
In NB-IoT systems, mutual interference between System Information Block 1 (SIB1) transmissions from different cells occurs due to shared resource locations, particularly in TDD NB-IoT, which affects transmission reliability.
Innovation Solution
A method involving the configuration of a Master Information Block (MIB) message that includes scheduling information and additional parameters such as status, time domain, frequency domain, and transmission mode information to flexibly manage SIB1 transmission on anchor and non-anchor carriers, ensuring distinct resource locations for each cell to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SIB1 is transmitted on subframe 0 of odd-numbered frames with repetition number 16 in TDD NB-IoT, then the transmission coverage is improved, but mutual interference between different cells occurs because all cells must use the same resource location
Solution Approach 1:
The patent applies dynamics by making the SIB1 transmission configuration flexible and adjustable. Different cells can dynamically select from multiple transmission options including different subframes (subframe 4 or subframe 0), different repetition numbers (4, 8, or 16), and different carriers (anchor or non-anchor). This dynamic configuration capability allows the system to adapt to different deployment scenarios and avoid interference while maintaining coverage.
Solution Approach 2:
The patent segments the SIB1 transmission resources across multiple dimensions: different subframes (subframe 4 and subframe 0), different repetition numbers (4, 8, 16), and different carriers (anchor and non-anchor). By dividing the transmission opportunities into distinct segments, the system can assign different segments to different cells, thereby avoiding resource conflicts and mutual interference while ensuring each cell achieves adequate transmission reliability.
2Device complexity
If SIB1 transmission uses fixed resource locations in TDD NB-IoT, then the system complexity is reduced, but the transmission reliability deteriorates due to unavoidable interference
Solution Approach 1:
The patent changes multiple transmission parameters to achieve both low complexity and high reliability. It introduces configurable parameters including subframe selection (subframe 4 or subframe 0), repetition numbers (4, 8, or 16), and carrier selection (anchor or non-anchor). These parameter changes provide flexibility for interference avoidance while maintaining relatively simple transmission structures. The network can configure appropriate parameters based on deployment scenarios without requiring complex transmission mechanisms.
3Ease of operation
If SIB1 transmission uses the same resource location for all cells in TDD NB-IoT, then the ease of operation is improved, but the transmission reliability is reduced due to interference
Solution Approach 1:
The patent applies local quality by allowing different cells to have different SIB1 transmission configurations tailored to their local deployment conditions. Each cell can independently select from available options (different subframes, repetition numbers, and carriers) based on local interference conditions and coverage requirements. This localized configuration approach maintains operational simplicity through standardized options while achieving high transmission reliability by avoiding interference at each specific location.
Data Source
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AI summary
This application provides a system message transmission method, an apparatus, and a system. A first communications device configures a MIB message, and the MIB message may carry various different information used to transmit a SIB1, for example, any one or more of scheduling information, first information, and an operation mode of a carrier, so that a second communications device receives the SIB1 based on the MIB message. The first communications device may flexibly configure information used to transmit the SIB1.In addition, when configuring the MIB message, the first communications device may consider ensuring, through configuration or implicit indication, that resource locations for transmitting SIB1s of different cells in one period are different. This type of interference isolation mechanism can avoid mutual interference between SIB1s of different cells, so that transmission reliability of the SIB1s can be improved.