CSI-RS Virtual Identifier Beam Mapping for AMM
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Solution Overview
Problem
Current CSI-RS designs in LTE-like systems are inadequate for supporting active mode mobility measurements in deployments with a large number of unique beams per cell, as they rely on static reference signals leading to high resource usage and measurement latency, and fail to efficiently handle scenarios where the CSI-RS is not centered within the bandwidth.
Innovation Solution
The proposed solution involves embedding beam identifiers in the frequency and time resource allocation of CSI-RS sequences, allowing for flexible configuration and dynamic transmission of CSI-RS, enabling efficient active mode mobility measurements by using virtual identifiers for sequence generation and transmission, and configuring UE to handle non-central SS locations and partial bandwidth CSI-RS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static CRS signaling is used for mobility measurements, then measurement consistency is improved, but resource usage and power consumption increase
Solution Approach 1:
The patent applies periodic action by replacing static always-on CRS signaling with periodic CSI-RS transmissions. The network node transmits CSI-RS at configured periodic intervals rather than continuously, reducing resource consumption while maintaining measurement capability. This resolves the contradiction by showing that periodic signaling suffices for mobility measurements without requiring persistent static signaling.
Solution Approach 2:
The patent applies dynamics by enabling flexible configuration of CSI-RS parameters including periodicity, bandwidth, and timing offsets. The system adapts CRS transmission characteristics based on deployment conditions and measurement needs, transforming static signaling into a dynamic, configurable mechanism that optimizes resource usage while maintaining measurement accuracy.
2Measurement precision
If static CRS signaling is used for mobility measurements, then measurement consistency is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by replacing static always-on CRS signaling with periodic CSI-RS transmissions. The network node transmits CSI-RS at configured periodic intervals rather than continuously, reducing resource consumption while maintaining measurement capability. This resolves the contradiction by showing that periodic signaling suffices for mobility measurements without requiring persistent static signaling.
3Measurement precision
If static CRS signaling is used for mobility measurements, then measurement consistency is improved, but inter-cell interference increases
Solution Approach 1:
The patent applies periodic action by replacing static always-on CRS signaling with periodic CSI-RS transmissions. The network node transmits CSI-RS at configured periodic intervals rather than continuously, reducing resource consumption while maintaining measurement capability. This resolves the contradiction by showing that periodic signaling suffices for mobility measurements without requiring persistent static signaling.
4Measurement precision
If CSI-RS is transmitted over full system bandwidth, then measurement coverage is improved, but configuration flexibility decreases
Solution Approach 1:
The patent applies dynamics by enabling flexible configuration of CSI-RS parameters including periodicity, bandwidth, and timing offsets. The system adapts CRS transmission characteristics based on deployment conditions and measurement needs, transforming static signaling into a dynamic, configurable mechanism that optimizes resource usage while maintaining measurement accuracy.
Solution Approach 2:
The patent applies local quality by allowing CSI-RS to be transmitted over partial bandwidth rather than requiring full system bandwidth. The network can configure CSI-RS to occupy specific bandwidth portions tailored to local deployment conditions, enabling flexible adaptation to different measurement scenarios while maintaining sufficient measurement coverage.
5Productivity
If beam identifiers are embedded in frequency and time resource allocation, then measurement efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by making CSI-RS serve multiple functions: it provides channel state information, enables mobility measurements, carries beam identifiers, and supports beam sweeping. By embedding beam IDs in frequency/time allocation and using virtual identifiers, the system achieves multi-functionality that improves measurement efficiency without requiring separate dedicated signaling mechanisms.
Data Source
AI summary
According to some embodiments, a method for use in a network node of transmitting a measurement signal for evaluating a quality of a link from a cell comprises: determining (412) a first virtual identifier for a first link; determining (414) a group of one or more channel state information reference signal (CSI-RS) sequences that are available to be transmitted from the cell; associating (420) one or more of a frequency resource allocation, a time resource allocation, a CSI- RS sequence from the group of one or more CSI-RS sequences, and a layer allocation with the first virtual identifier; and transmitting (422) a first CSI-RS for measurement using one or more of the frequency resource allocation, time resource allocation, CSI-RS sequence, and layer allocation associated with the first virtual identifier.