CSI Feedback Triggering for Reduced Capability Wireless Devices

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Solution Overview

Problem

Wireless communication systems face challenges in providing effective Channel State Information (CSI) feedback, particularly for devices with reduced capabilities, such as those with fewer antennas or reduced bandwidth, which affects coverage and cell planning, especially during initial access procedures like RACH.

Innovation Solution

The implementation of modified messages, such as DCI Format 1_0 and MAC RAR messages, to trigger earlier CSI feedback using aperiodic CSI-RS resources, allowing devices to report CSI during Msg3 messages, thereby improving coverage and connection establishment for reduced capability devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If devices with reduced capabilities (fewer antennas, reduced bandwidth) are used, then device complexity is reduced, but coverage performance deteriorates

Engineering Contradiction:

Improvedevice capabilityVSAvoidcoverage performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system performs preliminary CSI feedback before the random access procedure is complete. The wireless device transmits CSI feedback in Msg3 of the RACH procedure, allowing the network to have advance knowledge of channel conditions for better resource allocation and coverage management, thus compensating for the reduced capabilities of simplified devices

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the wireless device provides CSI feedback to the network during the initial access procedure. This feedback loop enables the network to adapt to the reduced capability devices by making informed decisions about resource allocation, modulation and coding schemes, and beamforming, thereby maintaining coverage performance despite device simplification

Inventive Principle:

Principle #23Feedback

2Quantity of substance

If CSI feedback is provided later in the connection process, then initial access message overhead is reduced, but connection establishment time increases

Engineering Contradiction:

Improvemessage overheadVSAvoidconnection establishment time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent merges the CSI feedback transmission with the existing RACH procedure messages. Specifically, the CSI feedback is transmitted within Msg3 of the random access procedure, combining multiple functions (random access continuation and channel state reporting) into a single message exchange, thus avoiding additional overhead while reducing connection establishment time

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If standard RACH procedure is used without earlier CSI feedback, then protocol complexity is reduced, but coverage performance for reduced capability devices deteriorates

Engineering Contradiction:

Improveprotocol complexityVSAvoidcoverage performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent makes the system universal by ensuring it works for both standard and reduced capability devices. The enhanced RACH procedure with CSI feedback in Msg3 can be selectively used based on device capability indications, allowing the network to optimize for coverage when needed while maintaining compatibility with standard devices, thus improving coverage performance without significantly increasing protocol complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12160296B2Methods and apparatus for device type and channel state information feedback over initial access message in wireless communication

Publication Date: 2024.12.03 APPLE INC

AI summary

Aspects herein relate to wireless devices, circuits, and methods for triggering earlier Channel State Information (CSI) feedback, comprising: transmitting, by a wireless device to a wireless station, an indication to provide earlier CSI feedback (e.g., wherein the indication comprises an indication that the wireless device has a reduced capability to receive messages); receiving from the wireless station, in response to the indication, a modified message (e.g., a Downlink Control Information or modified Medium Access Control Random Access Response), wherein the modified message triggers an earlier CSI feedback from the wireless device; transmitting to the wireless station, in response to receiving the modified message, the earlier CSI feedback using a message related to a RACH procedure (e.g., a Msg3); and completing a connection to the wireless station, e.g., in response to a repeated number of initial access messages broadcast from the wireless station and based on the transmitted CSI feedback.