Adaptive CSI Measurement for BWP Layer Transitions

Solution Overview

Problem

In wireless communications, network nodes lack reliable channel state information (CSI) measurements for non-active Bandwidth Parts (BWP), leading to unsuccessful receptions and resource wastage during BWP switching, especially when transitioning to BWPs with a higher number of layers.

Innovation Solution

The network node and wireless device employ CSI measurements using more antennas than the maximum configured for the current active BWP, particularly during anticipated transitions, and adapt based on Hybrid Automatic Repeat Request (HARQ) acknowledgments to ensure accurate CSI reporting and power savings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CSI measurements are performed using only the maximum number of layers configured for the current active BWP, then device complexity and power consumption are reduced, but CSI reliability is insufficient for BWP transitions to higher layer configurations

Engineering Contradiction:

ImproveCSI reliabilityVSAvoidantenna usage complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the antenna configuration adaptive rather than static. The wireless device dynamically adjusts the number of antennas used for CSI measurement based on the target BWP's layer configuration. When transitioning to a BWP with higher layers, the device activates additional antennas beyond the current active BWP's maximum layers to perform measurements, ensuring reliable CSI acquisition for the target configuration while returning to the configured maximum for the current active BWP during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies preliminary action by performing CSI measurements using additional antennas in advance of the BWP transition. The wireless device proactively measures channel state information for the target BWP configuration before actually switching occurs, allowing the network to have accurate CSI available when the transition happens, thereby avoiding unsuccessful receptions and resource wastage.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If CSI measurements are performed using more antennas than the maximum configured layers for the current active BWP, then CSI reliability for BWP transitions is improved, but power consumption increases

Engineering Contradiction:

ImproveCSI measurement reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the antenna configuration adaptive rather than static. The wireless device dynamically adjusts the number of antennas used for CSI measurement based on the target BWP's layer configuration. When transitioning to a BWP with higher layers, the device activates additional antennas beyond the current active BWP's maximum layers to perform measurements, ensuring reliable CSI acquisition for the target configuration while returning to the configured maximum for the current active BWP during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies preliminary action by performing CSI measurements using additional antennas in advance of the BWP transition. The wireless device proactively measures channel state information for the target BWP configuration before actually switching occurs, allowing the network to have accurate CSI available when the transition happens, thereby avoiding unsuccessful receptions and resource wastage.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the network node schedules BWP switching without reliable CSI for the target BWP, then network flexibility and switching speed are improved, but reception success rate deteriorates

Engineering Contradiction:

ImproveBWP switching speedVSAvoidreception success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by performing CSI measurements using additional antennas in advance of the BWP transition. The wireless device proactively measures channel state information for the target BWP configuration before actually switching occurs, allowing the network to have accurate CSI available when the transition happens, thereby avoiding unsuccessful receptions and resource wastage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies feedback by implementing a mechanism where the wireless device reports CSI for target BWPs to the network node before switching occurs. The network node receives this feedback information and uses it to make informed scheduling decisions during BWP transitions, ensuring that transmissions are properly configured based on accurate channel state information, thereby improving reception success rate while maintaining switching flexibility.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20220255711A1Adaptive CSI measurement and reporting for bwps with different number of layers

Publication Date: 2022.08.11 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method, system, network node and wireless device are disclosed. In one or more embodiments, a network node configured to communicate with a wireless device (WD) is provided. The network node is configured to, and/or has a radio interface and/or has processing circuitry configured to receive at least one channel state information, CSI, report associated with at least one CSI measurement using more antennas than a maximum number of layers configured for a current active bandwidth part, BWP.