CSI-RS Multiplexing with SSB for 5G Beam Sweeping Overhead Reduction
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Solution Overview
Problem
The existing 5G communication systems face significant resource overhead due to the need for multiple beams in high-frequency bands, particularly for synchronization signals and channel state information reference signals (CSI-RS), which leads to increased resource consumption and system performance degradation.
Innovation Solution
The method involves multiplexing the synchronization signal block (SSB), physical downlink control channel (PDCCH), and CSI-RS to reduce transmission overhead, achieved by puncturing CSI-RS in the SSB or PDCCH band, allowing for shared OFDM symbols for beam sweeping, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple beams are used for beam sweeping in high-frequency bands, then coverage and reliability are improved, but resource overhead increases significantly
Solution Approach 1:
The patent combines beam sweeping for SSB, PDCCH, and CSI-RS into a unified process. Specifically, the CSI-RS for beam sweeping is multiplexed with SSB or PDCCH in the time-frequency domain, allowing all three signals to share the same beam sweeping resources. This merging reduces the total number of separate beam sweeping operations from three independent processes to one unified process, thereby reducing resource overhead while maintaining coverage and reliability.
Solution Approach 2:
The patent makes the OFDM symbols universal by allowing them to serve multiple functions simultaneously. The same OFDM symbols are used for transmitting SSB, PDCCH, and CSI-RS, as well as for beam sweeping operations. This multi-functionality eliminates the need for separate dedicated resources for each signal type, reducing overall resource consumption while ensuring that coverage and reliability requirements are met through the unified beam sweeping approach.
2Reliability
If beam sweeping is performed separately for SSB, PDCCH, and CSI-RS, then each signal achieves optimal performance, but total resource consumption reaches 30%
Solution Approach 1:
The patent merges the separate beam sweeping operations for SSB, PDCCH, and CSI-RS into a single unified beam sweeping process. By multiplexing CSI-RS with SSB or PDCCH in the time-frequency domain, the patent ensures that all three signals benefit from the same beam sweeping resources rather than requiring separate dedicated resources. This merging maintains optimal performance for each signal while reducing total resource consumption from 30% to approximately 10%.
Solution Approach 2:
The patent resolves the resource conflict by utilizing different dimensions in the time-frequency domain. Instead of allocating separate time-frequency resources for each signal in the same dimension, the patent multiplexes CSI-RS with SSB or PDCCH by assigning them to different resource elements within the same OFDM symbols. This dimensional differentiation allows all three signals to coexist and perform beam sweeping simultaneously without interfering with each other, thereby improving resource efficiency while maintaining signal performance.
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A terminal in a wireless communication system and method thereof are provided for receiving a channel state information reference signal (CSI-RS). The method includes receiving configuration information on a CSI-RS, the configuration information including information on a transmission bandwidth of the CSI-RS; identifying a transmission bandwidth of a synchronization signal block (SSB); and receiving the SSB and the CSI-RS. When the SSB and the CSI-RS are configured to be allocated in an orthogonal frequency division multiplexing (OFDM symbol), the transmission bandwidth of the SSB and the transmission bandwidth of the CSI-RS are not overlapped.