Feedback Signaling Scheme for Collision-Free Mobile Data Transmission

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Solution Overview

Problem

Current mobile communication systems face challenges in efficiently transmitting feedback information for data packets, particularly in avoiding collisions and reducing the need for explicit identifiers in feedback signaling, which can lead to signaling errors and increased latency.

Innovation Solution

A new feedback signaling scheme is proposed that determines radio resources for feedback information based on the current transmission number of data packets, eliminating the need for individual or group identifiers and avoiding collisions by associating resources used for scheduling information with those used for feedback signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If feedback information is transmitted using traditional acknowledgment signals (ACK/NAK), then error detection and retransmission can be implemented, but feedback collision occurs and signaling errors increase

Engineering Contradiction:

Improvefeedback transmission reliabilityVSAvoidfeedback collision

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The feedback channel is segmented into multiple sub-channels, each dedicated to carrying feedback information for a specific data packet. This segmentation prevents feedback collision by ensuring that feedback for different packets is transmitted on separate, non-overlapping channels, thereby resolving the contradiction between reliable feedback transmission and avoiding feedback collision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A feedback indicator signal is introduced as an intermediary element that multiplexes feedback information from multiple data packets onto a single feedback channel. This intermediary mechanism allows multiple feedback signals to be combined without causing collision, as the indicator signal enables the receiver to distinguish between different feedback packets, thus improving reliability while avoiding collision.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If explicit identifiers are used in feedback signaling to avoid collisions, then feedback accuracy improves, but signaling overhead increases and latency increases

Engineering Contradiction:

Improvefeedback accuracyVSAvoidsignaling latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The need for explicit identifiers in feedback signaling is extracted and eliminated by using the packet counter values from the data packets themselves to determine feedback timing and channel assignment. This removes the redundant identifier requirement, reducing signaling overhead and latency while maintaining feedback accuracy through the inherent packet counter information.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The feedback transmission timing and channel assignment are predetermined based on the packet counter values and feedback indicator signal before actual transmission occurs. This preliminary determination eliminates the need for post-transmission identifier resolution, reducing latency while ensuring accurate feedback delivery through pre-established mapping rules.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If multiple feedback signals are transmitted simultaneously, then spectral efficiency improves, but feedback collision occurs

Engineering Contradiction:

Improvespectral efficiencyVSAvoidfeedback collision

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

Multiple feedback signals are merged onto a single feedback channel using the feedback indicator signal as a multiplexing mechanism. This merging approach allows simultaneous transmission of multiple feedback signals without collision, as the indicator signal enables the receiver to distinguish between different feedback packets, thereby improving spectral efficiency while avoiding collision.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The feedback channel is designed with universal capacity to carry feedback information from multiple data packets simultaneously, enabled by the feedback indicator signal. This multi-functional design allows the channel to serve multiple purposes (carrying different feedback signals) without causing collision, thus improving spectral efficiency while maintaining collision-free transmission.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8964654B2Avoidance of feedback collision in mobile communications

Publication Date: 2015.02.24 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

The invention relates to feedback transmission for data packets in a mobile communication system. In particular the invention provides a communication system wherein feedback information of a retransmission protocol for transmitted data packets is transmitted. Further, the invention relates to a method for determining radio resources for the transmission of feedback information of a retransmission protocol for transmitted data packets as well as to a base station and a mobile station performing the method. In order to prevent potential collisions of feedback information while omitting a destination identifier for identifying the receiver of the feedback, the feedback resources for sending the feedback are determined at least based on a current transmission counter for a packet.