Feedback Timing Indicator for Wireless Channel Capacity

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Solution Overview

Problem

Current wireless communication systems face inefficiencies in utilizing channel capacity and increasing power consumption due to the need for prompt feedback transmissions in retransmission schemes like ARQ and HARQ, leading to underutilization of resources and higher battery consumption.

Innovation Solution

Implementing a method to control the timing of feedback transmissions using a Feedback Timing Indicator (FTI) that allows for flexible scheduling, enabling trade-offs between latency and capacity, and reducing the frequency of feedback transmissions to avoid inter-dependency between subframes and optimize battery usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If prompt feedback transmissions are used in ARQ/HARQ retransmission schemes, then reliability of data transmission is improved, but channel capacity utilization deteriorates and power consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidchannel capacity utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies dynamics by making the feedback timing flexible rather than fixed. The base station can dynamically adjust the feedback timing indicator (FTI) to select different feedback timing options from a set of predefined options, allowing the system to adapt feedback transmission timing to current channel conditions and traffic patterns, thereby resolving the contradiction between reliable feedback and efficient resource utilization

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of feedback timing by introducing multiple feedback timing options (different K values) instead of a single fixed timing. The base station can select different timing parameters based on system conditions, transforming the rigid feedback timing mechanism into a flexible one that can optimize both reliability and channel capacity utilization under different operating scenarios

Inventive Principle:

Principle #35Parameter changes

2Reliability

If feedback transmissions are sent frequently to ensure reliable data transmission, then reliability is improved, but power consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent enables dynamic adjustment of feedback transmission frequency through the feedback timing indicator. Instead of continuous or fixed-frequency feedback, the system can adaptively select feedback timing that matches actual needs, reducing unnecessary feedback transmissions and thereby lowering power consumption while maintaining required reliability levels

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements periodic feedback transmission with variable periods. By selecting from multiple feedback timing options, the system creates adaptive periodic feedback patterns rather than continuous feedback, allowing sufficient time for data transmission between feedback events and reducing overall power consumption while maintaining transmission reliability

Inventive Principle:

Principle #19Periodic action

3Speed

If feedback is transmitted in the same subframe as data to reduce latency, then speed is improved, but channel capacity utilization deteriorates due to guard period requirements

Engineering Contradiction:

Improvefeedback transmission speedVSAvoidchannel capacity utilization

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent segments the feedback transmission timing into multiple discrete options (different K values representing different time offsets). This segmentation allows the system to choose appropriate feedback timing that avoids guard period conflicts while maintaining low latency, separating the feedback transmission from the data transmission in time without requiring early termination of data subframes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent resolves the time-conflict between feedback and data transmission by introducing an additional time dimension offset (K value). Instead of forcing feedback into the same subframe as data (zero offset), the system can select positive K values to place feedback in subsequent subframes, adding temporal separation that eliminates guard period requirements while maintaining efficient channel utilization

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11711175B2Methods and apparatuses for controlling timing of feedback transmissions

Publication Date: 2023.07.25 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is disclosed a method for controlling the timing of feedback transmissions by a communication device communicating over a communication link, wherein the communication link supports a retransmission scheme. The method comprises transmitting a feedback timing indicator, FTI, wherein the indicator is selected from a set of indicators.