CSI-RS Resource Pattern Configuration for 5G Port Scalability
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Solution Overview
Problem
The existing design of channel state information-reference signal (CSI-RS) patterns in LTE systems is not applicable to 5G systems, which require support for more than eight ports, leading to a need for a new reference signal pattern transmission method.
Innovation Solution
A method for determining and configuring the pattern of a CSI-RS resource by a network device, where the pattern occupies specific resource elements in both time and frequency domains, using different values of N (1, 2, or 4) to support various port quantities, thereby allowing flexible implementation of CSI-RS patterns in 5G systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LTE system uses CSI-RS pattern design supporting maximum eight ports, then the device complexity is reduced and ease of operation is improved, but the adaptability to 5G systems requiring no fewer than eight ports deteriorates
Solution Approach 1:
The patent segments the CSI-RS resource configuration into multiple parameters including port quantity (1, 2, or 4), cyclic shift values (0-7), and orthogonal cover code indices (0-3). This segmentation allows the system to support up to 32 ports by combining these segmented parameters, resolving the contradiction between supporting more ports and maintaining manageable complexity.
Solution Approach 2:
The patent introduces dynamic parameters including variable cyclic shift values and orthogonal cover code indices that can be flexibly configured. This dynamic configuration enables the system to adapt to different port quantities (1-32 ports) while maintaining a unified pattern design framework, thus improving adaptability without proportionally increasing complexity.
2Adaptability or versatility
If the 5G system supports no fewer than eight ports with new CSI-RS pattern design, then the adaptability is improved, but the device complexity increases compared to LTE system
Solution Approach 1:
The patent creates a universal CSI-RS pattern design that can support both LTE (up to 8 ports) and 5G (up to 32 ports) systems through the same configuration framework. By using universal parameters like cyclic shift and orthogonal cover codes that work across different port quantities, the system achieves multi-functionality without requiring separate design sets for different scenarios.
Solution Approach 2:
The patent changes key parameters from the LTE fixed 8-port design to a 5G-compatible variable parameter system where port quantity can be 1, 2, or 4 with corresponding cyclic shift and orthogonal cover code configurations. This parameter change enables support for 1-32 ports while maintaining a consistent design approach, resolving the complexity issue.
3Adaptability or versatility
If multiple CSI-RS patterns are configured to support different port quantities, then the adaptability is improved, but the signaling overhead increases
Solution Approach 1:
The patent uses partial configuration by specifying only the necessary parameters (port quantity, cyclic shift, orthogonal cover code index) rather than fully defining each possible pattern. This partial action approach reduces signaling overhead while still enabling support for multiple port quantities through selective parameter configuration.
Solution Approach 2:
The patent reuses the same cyclic shift and orthogonal cover code parameters across different port configurations. By copying and reusing these parameter definitions rather than creating separate unique patterns for each port quantity, the system reduces signaling overhead while maintaining adaptability to support 1-32 ports.
Data Source
AI summary
Embodiments of the present disclosure disclose a reference signal pattern transmission method and an apparatus therefor. The method includes: determining, a quantity N of symbols occupied by a CSI-RS resource, and N={1, 2, 4}; obtaining, a pattern of the CSI-RS resource; and sending, configuration information to a terminal device, N=1, the pattern of the CSI-RS resource occupies one RE in time domain, and occupies at least four consecutive REs in frequency domain; or N=2, the pattern of the CSI-RS resource occupies two consecutive REs in time domain, and occupies at least two consecutive REs in frequency domain; or N=4, the pattern of the CSI-RS resource occupies four consecutive REs in time domain, and occupies at least two consecutive REs in frequency domain. According to the embodiments of the present disclosure, a design of a pattern of a channel state information-reference signal resource in a 5G system can be implemented.