Link Adaptation in 60 GHz Wireless Systems

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Solution Overview

Problem

60 GHz wireless communication systems lack channel reciprocity due to differing numbers of antennas at each station, leading to inefficient data throughput and the need for explicit feedback for link adaptation, which results in slow adaptation processes and decreased throughput.

Innovation Solution

Implementing a method where a first wireless device transmits a request for channel parameters, including estimated quality and modulation and coding schemes, to a second wireless device, allowing for faster adaptation of RF links by selecting optimal MCS and power levels based on received feedback, thereby reducing complexity and improving data throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If explicit feedback is implemented for link adaptation in 60 GHz wireless communication systems, then channel quality can be accurately determined, but the adaptation process becomes slow and data throughput decreases

Engineering Contradiction:

Improvechannel quality estimation accuracyVSAvoiddata throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system performs preliminary channel quality estimation and MCS selection based on uplink channel conditions before downlink transmission. The base station estimates downlink channel quality using uplink channel measurements and channel reciprocity, then pre-selects optimal MCS and notifies the terminal in advance through RRC signaling or MAC CE, eliminating the need for slow explicit feedback loops while maintaining accurate adaptation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a simplified feedback mechanism where the terminal provides periodic channel quality indicators (CQI) or precoding matrix indicators (PMI) based on uplink measurements, rather than explicit downlink channel feedback. This reduced feedback overhead enables faster adaptation while maintaining sufficient accuracy for MCS selection

Inventive Principle:

Principle #23Feedback

2Reliability

If multiple antennas with different numbers at each station are used in 60 GHz wireless communication systems, then transmission security and anti-interference capability are improved, but channel reciprocity is lost and system complexity increases

Engineering Contradiction:

Improvetransmission securityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system segments the channel estimation process into independent uplink and downlink measurements at each station. Each station independently estimates channel conditions using its own receive antennas, then exchanges only essential channel quality indicators rather than full channel state information. This segmentation reduces the complexity of managing asymmetric antenna configurations while maintaining transmission security through multiple antennas

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements a universal channel quality estimation approach that works regardless of the number or configuration of antennas at each station. By focusing on extracting channel quality metrics (such as SINR) rather than full channel matrices, the system achieves channel adaptation functionality that is universal to different antenna configurations, reducing system complexity while maintaining reliability

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If continuous feedback of channel estimates is implemented, then optimal MCS selection can be achieved, but the necessity for continuous feedback removes the benefit of channel reciprocity and increases overhead

Engineering Contradiction:

ImproveMCS selection accuracyVSAvoidfeedback overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The system extracts only the essential channel quality information (such as SINR or CQI) needed for MCS selection from the full channel state, rather than transmitting complete channel estimates. This extraction of critical parameters enables accurate MCS adaptation while dramatically reducing feedback overhead and eliminating the need for continuous full channel state feedback, preserving the benefits of channel reciprocity

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8982803B1Systems and methods for link adaption in wireless communication systems

Publication Date: 2015.03.17 MARVELL ASIA PTE LTD

AI summary

A first wireless device includes a transmitter and a receiver. The transmitter is configured to transmit a request for parameters to a second wireless device via a communication channel, wherein the parameters include at least one of (i) an estimated quality of the communication channel and (ii) a modulation and coding scheme (MCS) for transmission via the communication channel. The transmitter is further configured to, based on at least one of the parameters, select a MCS for transmission to the second wireless device via the communication channel. The receiver is configured to receive a response from the second wireless device via the communication channel, wherein the response includes the parameters.