Type I Codebook Structure for High-Rank CSI-RS Transmission
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Solution Overview
Problem
Existing Type I codebooks in wireless communication networks are limited in supporting a large number of CSI-RS ports and do not effectively handle transmission scenarios with ranks higher than 4, leading to inefficiencies in signal transmission and reception.
Innovation Solution
Enhanced Type I codebooks are introduced to support up to 128 CSI-RS ports through multiple panels, enabling transmission scenarios with ranks 5, 6, 7, or 8, and incorporating Codebook Subset Restriction (CBSR) configurations to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing Type I codebooks are used, then device complexity is reduced, but the system cannot support a large number of CSI-RS ports and transmission ranks higher than 4
Solution Approach 1:
The codebook is divided into multiple codebook groups, where each group corresponds to a specific transmission rank range (e.g., ranks 1-4, ranks 5-8). This segmentation allows the system to select appropriate codebook groups based on the current transmission scenario, enabling support for both lower and higher ranks without requiring a single overly complex codebook structure.
Solution Approach 2:
The patent introduces a new dimension to the codebook structure by organizing codebooks across multiple groups and ranks. Instead of a single flat codebook, the structure is extended into a multi-dimensional space with codebook groups, ranks, and codebook indices, allowing systematic expansion to support up to 128 CSI-RS ports while maintaining manageable complexity through structured organization.
2Productivity
If existing Type I codebooks are used, then codebook management is simplified, but signal transmission efficiency deteriorates in high-rank scenarios
Solution Approach 1:
The system dynamically selects appropriate codebook groups based on the transmission rank and scenario requirements. For lower ranks (1-4), existing codebook structures are used, while for higher ranks (5-8), enhanced codebook groups are activated. This dynamic adaptation optimizes transmission efficiency for each scenario without permanently increasing complexity for all cases.
Solution Approach 2:
The patent changes key parameters of the codebook structure including the number of codebook groups, the range of supported ranks per group, and the codebook index allocation. These parameter changes enable the system to adapt to different transmission scenarios, improving efficiency for high-rank transmissions while maintaining compatibility with existing lower-rank operations.
3Adaptability or versatility
If codebook structure is expanded to support more CSI-RS ports, then adaptability improves, but processing complexity increases
Solution Approach 1:
The codebook processing is segmented into multiple stages corresponding to different codebook groups and rank ranges. The UE first determines the appropriate codebook group based on the number of CSI-RS ports and transmission rank, then processes only the relevant codebooks within that group. This segmentation reduces the effective processing complexity compared to handling all possible codebooks simultaneously, while still supporting up to 128 CSI-RS ports.
Solution Approach 2:
The system performs preliminary classification of the transmission scenario to determine the appropriate codebook group before actual codebook processing. By pre-determining which codebook group to use based on the number of CSI-RS ports and expected rank, the system avoids unnecessary processing of irrelevant codebooks, reducing overall processing complexity while maintaining full adaptability.
Data Source
AI summary
Disclosed are methods, systems, and computer-readable medium to perform operations that include receiving a channel state information reference signal (CSI-RS), and in response to receiving the CSI-RS, estimating CSI using a type I codebook. The type I codebook corresponds to a plurality of panels, and each panel of the plurality of panels corresponds to one CSI-RS resource.