CSI-RS and SSB Bandwidth Non-Overlap for 5G Beam Sweeping Overhead Reduction
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Solution Overview
Problem
In 5G communication systems, the high overhead of beam sweeping for synchronization signals and channel state information reference signals (CSI-RS) in high-frequency bands leads to significant resource consumption, deteriorating system performance.
Innovation Solution
The method involves allocating CSI-RS and synchronization signal blocks (SSB) in orthogonal frequency division multiplexing (OFDM) symbols such that their transmission bandwidths do not overlap, allowing for efficient multiplexing and reduced beam sweeping overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam sweeping is performed for CSI-RS and SSB separately in high-frequency bands, then coverage and synchronization are improved, but resource overhead increases significantly
Solution Approach 1:
The patent combines CSI-RS and SSB transmissions into a single beam sweeping process. The base station transmits both CSI-RS and SSB using the same beam directions and time resources, allowing the UE to perform both synchronization and channel state measurement simultaneously. This merging eliminates the need for separate beam sweeping procedures, reducing resource overhead while maintaining coverage reliability.
Solution Approach 2:
The patent makes the beam sweeping process universal by serving multiple functions simultaneously. The same beam sweeping transmission provides both synchronization signal functionality (SSB) and channel state information reference signal functionality (CSI-RS). This multi-functionality approach allows a single beam sweeping operation to fulfill multiple communication requirements, thereby reducing the total resource consumption.
2Loss of energy
If multiple beams are used for high-frequency band transmission, then path loss mitigation is improved, but the number of required beams and resources increases
Solution Approach 1:
The patent merges CSI-RS and SSB beam sweeping into a unified process where the same set of beams is used for both purposes. Instead of requiring separate beam sets for synchronization and channel measurement, the system uses a single beam configuration that serves both functions, thereby reducing the total number of beams needed while still mitigating path loss effectively.
3Reliability
If beam sweeping is performed for PDCCH, SSB, and CSI-RS separately, then control channel reliability is improved, but overall resource consumption increases to 30%
Solution Approach 1:
The patent merges the beam sweeping operations for PDCCH, SSB, and CSI-RS into a coordinated transmission scheme. By aligning the beam directions and time resources across these different signal types, the system maintains control channel reliability while eliminating redundant transmissions. This integration reduces the total resource consumption from 30% to a significantly lower level.
Solution Approach 2:
The patent introduces a new dimension of resource sharing by allowing multiple signal types (PDCCH, SSB, CSI-RS) to share the same beam sweeping resources in the time-frequency domain. This dimensional approach to resource allocation enables efficient multiplexing where different signals are transmitted using the same physical resources, thereby improving overall productivity without compromising reliability.
Data Source
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.