5G SSB Frequency Multiplexing for Faster Cell Search
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Solution Overview
Problem
The existing methods for sending and detecting synchronization signal blocks (SSBs) in 5G mobile communications systems are inefficient, particularly in terms of frequency domain utilization, which affects the performance of cell search, synchronization, and channel quality measurement.
Innovation Solution
The method involves sending and receiving synchronization signal blocks in a frequency division multiplexing manner across multiple frequencies within a single serving cell or bandwidth part, utilizing frequency division multiplexing (FDM) to improve the efficiency of SSB transmission and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SSBs are sent in time division multiplexing manner, then the existing 5G system can maintain backward compatibility and simple implementation, but the frequency domain utilization is inefficient and detection speed is slow
Solution Approach 1:
The patent transitions from time-domain multiplexing to frequency-domain multiplexing for SSB transmission. By introducing frequency as an additional dimension for resource allocation, multiple SSBs can be transmitted simultaneously at different frequencies rather than sequentially in time, thereby improving detection speed and frequency domain utilization efficiency
Solution Approach 2:
The patent segments the frequency spectrum into multiple candidate frequencies for SSB transmission. Each frequency carries SSB information independently, allowing terminal devices to detect SSBs in parallel across different frequencies, which enhances detection efficiency and system productivity
2Productivity
If frequency division multiplexing is introduced for SSB transmission, then frequency domain utilization and detection efficiency are improved, but the system complexity increases and compatibility with existing terminals is challenged
Solution Approach 1:
The patent designs the FDM SSB transmission system to be universal by supporting both FDM-capable and non-FDM-capable terminal devices. The network can flexibly configure SSB transmission modes, allowing the system to adapt to different terminal capabilities while maintaining the benefits of frequency domain multiplexing for advanced devices
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where the network can adaptively select between TDM and FDM modes based on terminal capabilities and system conditions. This dynamic flexibility allows the system to optimize performance while managing complexity by deploying FDM only where beneficial and compatible
3Loss of time
If multiple candidate SSBs are transmitted at different frequencies, then the terminal device can perform faster cell search and synchronization, but the resource configuration and indication become more complex
Solution Approach 1:
The patent incorporates feedback mechanisms where the network provides indication information to terminal devices about the frequency-domain locations of candidate SSBs. This feedback enables terminals to efficiently configure their search parameters and reduces the complexity of blind search, thereby decreasing cell search time while managing configuration complexity
Solution Approach 2:
The patent implements preliminary configuration of frequency resources for candidate SSBs before actual detection. By pre-allocating and indicating frequency positions in advance, the terminal device can prepare its detection parameters ahead of time, reducing the complexity of real-time resource configuration and accelerating the cell search process
Data Source
AI summary
A method includes: a network device sends a first synchronization signal/physical broadcast channel block on a first resource in resources corresponding to at least two candidate synchronization signal/physical broadcast channel blocks (SSBs), where the at least two candidate SSBs are respectively located at least two frequencies in a single serving cell or a single bandwidth part in a frequency division multiplexing manner; and the network device sends resource information of the first SSB.