Base Station Channel Quality Reporting Mode Control

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Solution Overview

Problem

Current wireless communication networks face challenges in efficiently determining the optimal channel quality reporting modes for users competing for resources within a defined system bandwidth, as existing methods do not adequately account for varying channel conditions and scheduling freedoms, leading to suboptimal resource allocation and throughput.

Innovation Solution

A method where a base station dynamically determines the channel state information reporting mode for individual users by estimating coherence bandwidth and predicting transmission bandwidth, deciding whether to use frequency-selective channel quality reporting, frequency-selective precoder reporting, or wideband reporting based on these evaluations, to optimize resource allocation and adapt to changing channel conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If frequency-selective channel quality reporting is used, then scheduling flexibility is improved, but signaling overhead increases

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent applies local quality by differentiating reporting strategies across different frequency subbands. Instead of uniform wideband reporting, the system enables frequency-selective reporting only where channel conditions and scheduling requirements demand it, optimizing the balance between scheduling flexibility and signaling overhead on a per-subband basis

Inventive Principle:

Principle #3Local quality

2Productivity

If dynamic reporting mode determination is implemented, then resource allocation efficiency is improved, but system complexity increases

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements preliminary action by pre-determining optimal reporting modes based on channel conditions and scheduling requirements. The base station proactively configures appropriate reporting modes (wideband or frequency-selective) before resource allocation decisions, avoiding complex real-time calculations and reducing system complexity while maintaining high resource allocation efficiency

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If coherence bandwidth estimation is performed, then beamforming accuracy is improved, but processing time increases

Engineering Contradiction:

Improvebeamforming accuracyVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies periodic action by performing coherence bandwidth estimation at appropriate intervals rather than continuously. The system updates beamforming parameters and reporting mode configurations periodically based on channel condition changes, maintaining accurate beamforming while reducing processing time and computational overhead

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8965430B2Method and apparatus for controlling channel quality reporting modes used by wireless communication network users

Publication Date: 2015.02.24 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to this disclosure, a base station or other controlling node within a wireless communication network determines which channel state information reporting mode should be used by individual users among a plurality of active users being supported by the network. In particular, the determination is made as to whether or not an individual user should use frequency-selective reporting and, if so, whether the user should report a frequency-selective channel quality indicator or a frequency-selective precoder matrix indicator.