SSB PBCH Segmentation for Multi-Bandwidth Synchronization
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Solution Overview
Problem
Current communication systems in 5G NR require separate synchronization signal blocks for terminal devices with different bandwidth types, leading to inefficient use of transmission resources due to repeated transmission of common information like cell ID and SFN.
Innovation Solution
The system generates a single synchronization signal block (SSB) with multiple physical broadcast channels (PBCHs), each carrying time-frequency resource position information for different synchronization information types, allowing terminal devices of various bandwidth types to share common synchronization information, reducing the need for separate SSBs and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate SSBs are transmitted for terminal devices of different bandwidth types, then synchronization support for various bandwidth types is ensured, but transmission resources are wasted due to repeated transmission of common information
Solution Approach 1:
The PBCH is segmented into multiple independent PBCHs within a single SSB, where each PBCH is configured for a specific bandwidth type (e.g., 12-RB, 6-RB, 1-RB terminal devices). This segmentation allows each PBCH to carry synchronization information tailored to specific terminal devices while sharing common resources, thereby reducing redundant transmissions of cell ID and SFN.
Solution Approach 2:
The SSB structure is designed to serve multiple bandwidth types universally through a single transmission. By incorporating multiple PBCHs with different bandwidth configurations within one SSB, the system achieves multi-functionality where a single SSB can support both 12-RB and narrowband terminal devices simultaneously, eliminating the need for separate SSB transmissions.
2Reliability
If separate SSBs are transmitted for terminal devices of different bandwidth types, then synchronization information is accurately delivered to each device type, but system complexity increases due to multiple SSB designs
Solution Approach 1:
The PBCH is divided into multiple specialized PBCHs, each optimized for specific bandwidth types. This segmentation allows reliable delivery of synchronization information to different terminal devices while maintaining a unified SSB structure, avoiding the complexity of designing and managing entirely separate SSBs for each bandwidth type.
Solution Approach 2:
Multiple PBCHs serving different bandwidth types are merged into a single SSB transmission structure. This combining approach maintains reliability by including all necessary PBCH variants in one transmission, while simplifying system complexity by using a single unified SSB design rather than multiple separate SSB designs.
3Loss of energy
If multiple PBCHs are included in a single SSB, then transmission resources are reduced, but the structure of the SSB becomes more complex
Solution Approach 1:
The PBCH content is segmented into multiple specialized channels within the SSB, each targeting specific bandwidth types. This internal segmentation reduces the need for multiple separate SSB transmissions, thereby saving transmission resources while the segmented structure is managed within a standardized SSB framework.
Solution Approach 2:
Multiple PBCHs are nested within the single SSB structure, similar to nested dolls. Each PBCH is contained within the overall SSB transmission, allowing efficient resource utilization by packing multiple information channels into one transmission unit, while the nested organization manages structural complexity through hierarchical arrangement.
Data Source
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AI summary
A communication method and a device are provided. The communication method includes: An access network device generates a synchronization signal block SSB, where the SSB includes a first physical broadcast channel PBCH and a second PBCH, the first PBCH carries time-frequency resource position information of first synchronization information, the second PBCH carries time-frequency resource position information of second synchronization information, and a time-frequency resource position of the first synchronization information is different from a time-frequency resource position of the second synchronization information; and the access network device broadcasts the SSB. In embodiments of this application, the SSB may carry PBCHs corresponding to terminal devices of different bandwidth types and/or synchronization information of the terminal devices of different bandwidth types, to satisfy processing requirements of the terminal devices of a plurality of bandwidth types. The access network device may send, only once, information applicable to all the terminal devices of different bandwidth types, thereby further improving resource utilization.