Nested Reference Signal Structure for Multi-Beam Detection
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Solution Overview
Problem
The existing methods for CSI-RS transmission in multi-antenna systems require significant overhead and latency due to the need for multiple repetitions to find the best Tx-Rx beam pair, especially with increasing numbers of antennas at network devices and terminal devices.
Innovation Solution
A nested structure of RS resources based on Interleaved Frequency Division Multiple Access (IFDMA) techniques is implemented, allowing multiple repeated signals within one symbol and enabling the detection of multiple beams within one symbol, while also allowing multiple RS sequences to be mapped to the same or different RS resources for simultaneous detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple repetitions of CSI-RS are transmitted to find the best Tx-Rx beam pair, then beam management accuracy is improved, but transmission overhead and latency increase significantly
Solution Approach 1:
The patent applies nesting by mapping multiple RS sequences to the same or different RS resources in a nested structure, allowing multiple beam signals to be transmitted within a single symbol period. This nested arrangement enables the terminal to detect multiple beams simultaneously without requiring separate time slots for each beam, thereby reducing overall transmission latency while maintaining beam management accuracy.
Solution Approach 2:
The patent introduces a new dimension by using frequency domain interpolation and mapping multiple RS sequences to the same RS resources. Instead of transmitting beams sequentially in time, the system multiplexes multiple beams in the frequency domain within a single symbol, effectively adding a frequency dimension to the beam transmission process and reducing time-related overhead.
2Reliability
If the number of antennas at network device and terminal device increases, then system capacity and signal quality are improved, but the number of beams to be swept increases exponentially
Solution Approach 1:
The patent applies universality by enabling multiple RS sequences to be mapped to the same RS resources, allowing a single RS resource to serve multiple beam functions simultaneously. This multi-functional use of RS resources reduces the total number of unique beam signals that need to be transmitted and detected, thereby reducing the complexity of beam sweeping even as the number of antennas increases.
Solution Approach 2:
The patent merges multiple beam transmissions by mapping multiple RS sequences to the same or different RS resources within a single symbol. This combining approach consolidates what would traditionally be separate beam transmission operations into a unified process, reducing the exponential growth of beam management complexity while maintaining the signal quality benefits of multiple antennas.
3Ease of manufacture
If CSI-RS transmission uses traditional one-symbol-per-repetition method, then implementation simplicity is maintained, but overhead reduction is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the RS resource allocation into a nested structure where multiple RS sequences can be mapped to the same or different RS resources. This segmented approach allows flexible configuration of RS transmissions, enabling the system to reduce overhead by mapping multiple sequences to the same resources when appropriate, while maintaining implementation simplicity through standardized mapping rules.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and devices for reference signal (RS) transmission. In example embodiments, a method implemented in a network device is provided. According to the method, a first set of RS resources are determined for RS transmission by the network device. The first set of RS resources are associated with a first number of RS ports to be used for RS transmission and correspond to a first set of resource elements (REs) interpolated with unused REs in frequency domain. A first RS configuration for RS transmission is generated based on the first set of RS resources. Information on the first RS configuration is transmitted to a terminal device served by the network device.