Aperiodic CSI-RS Triggering for Channel State Measurement
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Solution Overview
Problem
In 5G wireless communication systems, the fixed transmission of channel state information reference signals (CSI-RS) poses challenges in supporting various services, especially when CSI-RS transmission is not guaranteed, making it difficult to obtain minimum channel state information between base stations and terminals.
Innovation Solution
A method and device for efficiently reporting channel state information by transmitting CSI-RS configuration information, feedback configuration, and trigger information, allowing aperiodic transmission of CSI-RS, and using synchronization signals for channel state information measurement and reporting, even when CSI-RS is not guaranteed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS is transmitted periodically to ensure channel state information availability, then measurement precision is improved, but device complexity and resource overhead increase
Solution Approach 1:
The patent implements dynamic switching between periodic and aperiodic CSI-RS transmission modes based on service requirements. The base station can configure terminals to use periodic CSI-RS for services requiring continuous channel state information, while using aperiodic CSI-RS triggered by downlink control information for services where channel state information is needed only at specific moments, thereby reducing complexity and resource overhead while maintaining measurement precision when needed.
2Adaptability or versatility
If CSI-RS transmission is made flexible to support diverse services, then adaptability is improved, but reliability of channel state information delivery deteriorates
Solution Approach 1:
The patent introduces downlink control information as an intermediary trigger mechanism that enables reliable aperiodic CSI-RS transmission. When the base station needs to provide channel state information for a specific service, it sends downlink control information to the terminal, which then triggers the terminal to measure and report channel state information based on the aperiodic CSI-RS. This intermediary trigger ensures reliable delivery of channel state information while maintaining flexible service support.
3Loss of energy
If aperiodic CSI-RS transmission is used to reduce overhead, then loss of energy is reduced, but measurement precision may deteriorate when CSI-RS is not transmitted
Solution Approach 1:
The patent implements a feedback mechanism where the terminal reports channel state information based on measured CSI-RS to the base station. The base station uses this feedback information to determine whether to transmit aperiodic CSI-RS in subsequent transmissions. This feedback loop ensures that energy is not wasted transmitting CSI-RS when channel state information is already available from previous measurements, while still maintaining measurement precision when needed by triggering aperiodic transmission only when the feedback indicates a need for updated channel state information.
Data Source
AI summary
Disclosed are a communication technique for merging, with an IoT technology, a communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. A method performed by a UE includes receiving, from a base station, first configuration information configuring a first CSI report, wherein the first configuration information indicates to use a first synchronization signal for channel measurement for the first CSI report; obtaining the first CSI report based on the first configuration information; and transmitting the first CSI report to the base station. The first CSI report includes first CSI associated with the first synchronization signal based on the first configuration information, the first CSI associated with the first synchronization signal includes an SINR associated with the first synchronization signal, and the SINR associated with the first synchronization signal corresponds to a wideband