Narrowband PBCH Allocation for 5 MHz NR Terminals
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Solution Overview
Problem
Existing 5G NR systems do not support bandwidths of 5 MHz or less, leading to issues in transmitting and receiving channels or signals between radio base stations and UEs.
Innovation Solution
The proposed solution involves a terminal and radio base station that allocate and receive resource blocks differently when a bandwidth of 5 MHz or less is applied, using a second channel bandwidth that is narrower than the first, and adjusting the position and spacing of synchronization and control channels to accommodate the reduced bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a bandwidth of 5 MHz or less is used, then low latency use cases (smart grids, railway mobile communication) are supported, but conventional channel and signal formats cannot be transmitted or received between radio base stations and UEs
Solution Approach 1:
The patent changes the bandwidth parameter from the conventional 5 MHz or wider to 5 MHz or less, enabling support for low latency use cases. Simultaneously, it adjusts the resource block allocation parameters and synchronization signal block configurations to accommodate the narrower bandwidth, ensuring that channel and signal transmission remains reliable despite the parameter change.
2Adaptability or versatility
If a second channel bandwidth narrower than the first channel bandwidth is applied, then narrow bandwidth scenarios are supported, but resource block allocation and channel positioning become complex
Solution Approach 1:
The patent implements dynamic resource block allocation where the number and positioning of resource blocks are adjusted based on the applied bandwidth. The system dynamically configures the resource block structure to match the second channel bandwidth, simplifying the allocation process while maintaining bandwidth adaptability. The synchronization signal block positions are also dynamically determined based on the bandwidth configuration.
3Reliability
If resource blocks are excluded from the first channel bandwidth to form remaining resource blocks, then proper signal transmission is enabled, but the occupied bandwidth creates transmission issues
Solution Approach 1:
The patent segments the resource blocks into different groups based on their allocation patterns. By excluding certain resource blocks from the first channel bandwidth configuration, it creates remaining resource blocks that are specifically allocated for the second channel bandwidth. This segmentation enables proper signal transmission within the narrower bandwidth while managing the occupied bandwidth effectively.
Data Source
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AI summary
A terminal includes a reception unit that receives a physical broadcast channel to which one or more resource blocks are allocated, and a control unit that assumes, when a second channel bandwidth narrower than a first channel bandwidth is applied, the physical broadcast channel, to which a remaining resource block is allocated which is obtained by excluding a part of the resource blocks corresponding to the first channel bandwidth.