Millimeter-Wave Beamforming Initial Access via SS Block Segmentation
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Solution Overview
Problem
Current 5G communication systems face challenges in transmitting synchronization information and system information for analog beamforming in mmWave systems, particularly in achieving subframe synchronization and managing channel resources efficiently.
Innovation Solution
The method involves designing a PSS/SSS/PBCH transmission format and beam reporting-based beam management to facilitate initial access, using a terminal to detect synchronization signals, acquire a cell ID, and receive system information on a physical broadcast channel (PBCH) without unnecessary channel estimation, and a base station to transmit synchronization signals and system information using distinct beams for each synchronization signal block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog beamforming is used to transmit synchronization signals in all directions, then all users within cell coverage can receive the signals, but the complexity of beam management increases and resource overhead increases
Solution Approach 1:
The patent segments the synchronization signal transmission into multiple SS blocks, each transmitted on a different beam direction. Instead of transmitting continuously in all directions, the system divides the coverage area into multiple beam segments and transmits PSS/SSS/PBCH in each segment separately, reducing overall beam management complexity while maintaining full coverage
Solution Approach 2:
The patent implements periodic beam sweeping where synchronization signal blocks are transmitted in a periodic manner across different beam directions. This periodic action allows the system to cover all directions over time without requiring simultaneous transmission in all directions, reducing instantaneous resource overhead and beam management complexity
2Measurement precision
If channel estimation is performed for each synchronization signal block, then accurate channel information is obtained, but resource overhead increases
Solution Approach 1:
The patent makes the synchronization signal blocks themselves serve dual purposes: both for synchronization acquisition and for channel estimation. By designing the SS blocks to contain sufficient channel information, the system eliminates the need for separate dedicated pilot signals, thereby reducing resource overhead while maintaining estimation accuracy
Solution Approach 2:
The synchronization signal blocks perform self-service by providing both synchronization and channel estimation functions. The SS blocks contain embedded channel information that allows terminals to perform channel estimation directly from the synchronization signals themselves, without requiring additional external pilot resources
3Measurement precision
If subframe synchronization is achieved using PSS and SSS transmitted repeatedly, then symbol synchronization is possible, but subframe synchronization cannot be achieved
Solution Approach 1:
The patent adds a new dimension to the synchronization approach by introducing timing indicators within the PBCH that convey subframe synchronization information. Instead of relying solely on the temporal repetition of PSS/SSS, the system embeds additional synchronization dimension in the broadcast channel, allowing terminals to acquire both symbol and subframe synchronization
4Reliability
If CRS is continuously transmitted in all beam directions for channel estimation, then channel information is available for PBCH decoding, but resource overhead increases significantly
Solution Approach 1:
The patent extracts the channel estimation function from the continuous CRS transmission and relocates it to the synchronization signal blocks. By taking out the channel estimation requirement from the PBCH decoding process and fulfilling it through SS blocks, the system eliminates the need for continuous CRS transmission in all beam directions, significantly reducing resource overhead while maintaining decoding reliability
Data Source
AI summary
Disclosed are a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety related services, and the like) on the basis of 5G communication technology and IoT related technology. Disclosed are a signal, a channel structure, and an operation method and device for supporting initial access for a system expected to remarkably increase M communication capacity, by using beamforming on a wide frequency band in next-generation communication for supporting a millimeter-wave (mmWave) band.