Aperiodic CSI-RS Trigger for Massive MIMO Overhead
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Solution Overview
Problem
Current CSI-RS transmission methods are inadequate for massive MIMO systems due to increased control signaling overhead, as they are designed for conventional MIMO systems and cannot efficiently support the growing number of antennas.
Innovation Solution
Implementing an aperiodic CSI-RS transmission method where the base station determines the necessity of aperiodic CSI-RS based on the number of mobile stations, generates an aperiodic CSI-RS trigger signal, and communicates it to the mobile station, allowing flexible adjustment of CSI-RS transmission according to system needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to improve system throughput in massive MIMO systems, then the throughput is improved, but the control signaling overhead for CSI-RS increases
Solution Approach 1:
The patent applies dynamics by transitioning from static periodic CSI-RS transmission to dynamic aperiodic CSI-RS transmission. The base station determines whether to transmit CSI-RS based on current system conditions (number of mobile stations, channel variability), and mobile stations can request CSI-RS when needed. This dynamic approach allows the system to adapt CSI-RS transmission to actual needs, reducing unnecessary overhead while maintaining throughput performance in massive MIMO systems.
2Measurement precision
If periodic CSI-RS transmission is used to provide comprehensive channel state information, then measurement accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent applies periodic action by allowing the system to switch between periodic CSI-RS transmission (for comprehensive channel state information) and aperiodic CSI-RS transmission (for on-demand measurements). The base station can configure periodic CSI-RS with appropriate periodicity based on channel conditions, while also enabling mobile stations to trigger aperiodic CSI-RS transmissions when immediate channel state information is needed, thereby balancing measurement accuracy with resource efficiency.
Solution Approach 2:
The patent applies parameter changes by allowing flexible adjustment of CSI-RS transmission parameters including periodicity, bandwidth, and number of ports based on system conditions. The base station can modify these parameters dynamically to match the number of active mobile stations and channel characteristics, reducing resource overhead when fewer measurements are needed while maintaining measurement precision when required.
3Quantity of substance
If aperiodic CSI-RS transmission is implemented to reduce control signaling overhead, then resource efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies feedback by implementing a mechanism where mobile stations can request CSI-RS transmissions based on their channel measurement needs, and the base station responds by determining whether to transmit aperiodic CSI-RS. This feedback loop allows the system to reduce control signaling overhead by only transmitting CSI-RS when actually needed, while the added complexity is managed through standardized feedback procedures that integrate with existing LTE control mechanisms.
Data Source
AI summary
An embodiment of present disclosure provides a method of transmitting channel state information reference signals, and a base station. An embodiment of the present disclosure provides a method of transmitting channel state information reference signals (CSI-RSs), which is executed by a base station, and this method includes the steps of determining whether or not it is necessary to use aperiodic CSI-RSs in a communication system in which a base station to use periodic CSI-RSs is provided, generating an aperiodic CSI-RS trigger signal and communicating the aperiodic CSI-RS trigger signal to a mobile station when aperiodic CSI-RSs need to be used, and communicating aperiodic CSI-RSs to the mobile station in accordance with the aperiodic CSI-RS trigger signal.