CSI-RS Tree Structure Signaling for 5G Overhead Reduction
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Solution Overview
Problem
In 5G wireless communication networks, the signaling overhead for configuring CSI-RS measurements is high due to the need to dynamically select from a large pool of CSI-RS resources, especially when only a subset of resources is required, leading to inefficient use of bits for signaling.
Innovation Solution
A tree structure for CSI-RS element aggregation is introduced, allowing for variable aggregation sizes, where the tree structure overlaps larger aggregations with smaller ones, and index mapping is used for signaling from gNB to UE, enabling a reduction in signaling overhead by using a K-bit indicator to select and report measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large pool of CSI-RS resources is configured for dynamic selection, then measurement flexibility and adaptability are improved, but signaling overhead increases due to the need to indicate specific resource selections
Solution Approach 1:
The patent segments the CSI-RS resource pool into multiple groups, where each group contains a subset of resources. Instead of selecting individual resources from the entire pool, the system selects entire groups using compact group-level indicators. This segmentation reduces the number of bits required for signaling while maintaining the ability to flexibly configure measurements across different resource subsets.
Solution Approach 2:
The patent introduces a hierarchical dimension to the resource selection process by organizing resources into groups and applying group-level indicators. This dimensional organization transforms the flat resource selection problem into a multi-level structure, enabling more efficient signaling through group-based indication rather than individual resource specification.
2Measurement precision
If individual CSI-RS resources are selected from a large pool, then measurement precision is improved, but the number of bits required for signaling increases
Solution Approach 1:
The patent segments the large pool of CSI-RS resources into multiple groups, allowing the system to maintain access to individual resource-level precision for channel estimation while using group-level indicators for signaling. This segmentation enables the system to signal compactly at the group level while preserving the ability to perform precise measurements on individual resources within selected groups.
Solution Approach 2:
The patent introduces group-level indicators as an intermediary between the large resource pool and the actual resource selection process. These intermediaries represent subsets of resources, allowing the system to convey selection information using fewer bits while still enabling precise channel estimation on the underlying individual resources through the group structure.
3Area of stationary object
If all CSI-RS resources are configured for measurement, then measurement coverage is improved, but resource overhead and processing complexity increase
Solution Approach 1:
The patent segments the complete set of CSI-RS resources into multiple groups that can be selectively activated. This segmentation allows the system to maintain comprehensive measurement coverage capability by having all resources available in the pool, while reducing actual processing complexity by activating only specific groups through group-level indicators, thereby avoiding the need to process all resources simultaneously.
Solution Approach 2:
The patent applies partial action by configuring a complete resource pool for potential measurement coverage but activating only subsets of resources through group-based selection. This approach ensures full measurement coverage is available when needed while reducing processing complexity by engaging only the necessary portions of the resource pool for each specific measurement scenario.
Data Source
AI summary
One or more nodes transmit CSI-RS symbols in a set of N CSI-RS elements, each CSI-RS element in the set corresponding to at least one resource element in a time-frequency grid of resource elements. The nodes select, from the N CSI-RS elements, a first set of CSI-RS elements to be measured by a first wireless device, the first set comprising one or several of the N CSI-RS elements. The nodes also transmit, to the first wireless device, a message comprising a first K-bit indicator identifying the first set of CSI-RS elements, wherein K<N. The nodes then receive a measurement report. The first K-bit indicator is one of a predetermined set of K-bit indicators, where each member of the predetermined set of K-bit indicators uniquely corresponds to a CSI-RS element or group of CSI-RS elements from among the N CSI-RS, according to a predetermined mapping.