PBCH Resource Mapping via SSB Frequency Position in Narrowband Networks
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Solution Overview
Problem
In dedicated narrowband networks with limited bandwidth, network devices struggle to completely send synchronization signal broadcast blocks, leading to incomplete physical broadcast channels, necessitating additional resource consumption for indicating frequency domain resource mapping positions to terminal devices.
Innovation Solution
A method to determine and indicate the frequency domain resource mapping position of the physical broadcast channel based on an association relationship, reducing the need for additional signaling exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional signaling is used to indicate the frequency domain resource mapping position of the incomplete PBCH, then the terminal device can correctly receive the PBCH, but the transmission resource consumption increases
Solution Approach 1:
The patent combines the frequency domain resource mapping position indication with the existing SSB structure by using the first frequency position (center frequency of the first SSB) as an implicit indicator. This merging approach eliminates the need for separate additional signaling while maintaining the ability to correctly identify and receive the incomplete PBCH in dedicated narrowband networks.
Solution Approach 2:
The first frequency position itself serves the dual purpose of indicating both the location of the first SSB and the frequency domain resource mapping position of the incomplete PBCH. This self-service mechanism allows the system to convey necessary information without requiring external additional signaling, thereby reducing transmission resource consumption while ensuring reliable PBCH reception.
2Reliability
If the network device transmits a complete SSB in dedicated narrowband networks, then the terminal device can receive synchronization signals, but the limited bandwidth prevents complete transmission of the PBCH
Solution Approach 1:
The patent segments the SSB transmission by transmitting only the essential components (synchronization signals and part of the PBCH) that fit within the limited dedicated narrowband bandwidth. The incomplete PBCH is transmitted with reduced frequency domain bandwidth, and the remaining information can be obtained through the association relationship between the first frequency position and the resource mapping position, ensuring reliable synchronization while adapting to bandwidth constraints.
Solution Approach 2:
The patent changes the frequency domain bandwidth parameter of the PBCH transmission to match the available dedicated narrowband bandwidth. By adjusting the frequency domain resource mapping position based on the first frequency position, the system optimizes the transmission to fit within the limited bandwidth while maintaining the necessary information for reliable terminal device reception and decoding.
Data Source
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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. In this manner, the first frequency domain resource mapping position of the first PBCH can be indicated without additional signaling exchange, so that transmission resource consumption can be reduced.