CSI-RS Port Deactivation for 5G Base Station Energy Saving

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Solution Overview

Problem

Existing 5G base stations face high power consumption due to fixed transmission power settings of downlink common signals, which can be reduced by dynamically adjusting transmission parameters at short intervals to balance energy savings with cell throughput and coverage.

Innovation Solution

Implementing a method where a base station adjusts CSI-related parameters at short intervals, including CSI-RS resource configuration, number of ports, and frequency domain transmission, to measure and report suitable UE CSI, thereby reducing energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If fixed transmission power settings are used for downlink common signals, then cell coverage and throughput are maintained, but base station power consumption increases

Engineering Contradiction:

Improvebase station power consumptionVSAvoidcell coverage and throughput

Core Design Contradiction:

Use of energy by stationary objectVSReliability

Solution Approach 1:

The patent applies dynamics by transitioning from fixed transmission power settings to dynamic adjustment mechanisms. The base station continuously monitors CSI feedback from UEs and adjusts downlink common signal transmission parameters (such as power, bandwidth, or resource allocation) in real-time based on current channel conditions, thereby reducing power consumption while maintaining adequate coverage and throughput.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying transmission parameters of downlink common signals based on CSI measurements. Specifically, the base station adjusts parameters such as transmission power, resource block allocation, or signal configuration according to the measured channel quality, enabling energy-saving operation during good channel conditions while maintaining service quality during poor conditions.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by stationary object

If transmission parameters are adjusted frequently, then energy saving is improved, but system complexity and measurement requirements increase

Engineering Contradiction:

Improvebase station power consumptionVSAvoidsystem complexity

Core Design Contradiction:

Use of energy by stationary objectVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by having the base station configure CSI measurement resources and parameters in advance through RRC signaling. The UE is pre-configured with CSI-RS resource configurations, reporting formats, and triggering conditions, so that when dynamic adjustment is needed, the base station can quickly trigger CSI reports without complex real-time negotiations, thereby reducing system complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where the UE measures downlink channel quality using pre-configured CSI-RS resources and reports CSI feedback to the base station. This automated feedback loop enables the base station to make informed transmission parameter adjustments without complex manual intervention or extensive signaling, balancing energy saving with system complexity.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If CSI measurements are performed continuously, then transmission parameter accuracy is improved, but base station power consumption increases

Engineering Contradiction:

ImproveCSI measurement accuracyVSAvoidbase station power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by stationary object

Solution Approach 1:

The patent applies periodic action by implementing discontinuous CSI measurements and reporting. Instead of continuous monitoring, the base station triggers CSI reports periodically or event-driven based on channel condition changes. The UE performs CSI measurements only when triggered, and the base station adjusts transmission parameters based on these periodic updates, thereby maintaining measurement accuracy while reducing overall power consumption.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements partial action by performing CSI measurements and transmissions only when necessary rather than continuously. The base station uses threshold-based triggering or event-driven mechanisms to initiate CSI reporting only when channel conditions warrant parameter adjustments, avoiding unnecessary measurements and transmissions that would consume additional power.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20260031873A1Method and device for energy saving in wireless communication system

Publication Date: 2026.01.29 SAMSUNG ELECTRONICS CO LTD

AI summary

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. Specifically, a method performed by a terminal in a wireless communication system comprises the steps of: receiving, from a base station, an RRC message including information indicating the number of ports; receiving, from the base station, a message for deactivating at least one port among ports corresponding in number to the number of ports, wherein the message includes resource allocation information in a frequency domain associated with the at least one port; receiving an CSI-RS from the base station via ports that are among the ports corresponding in number to the number of ports but exclude the at least one antenna port deactivated on the basis of the message; and reporting, to the base station, CSI acquired on the basis of the CSI-RS.