Sidelink HARQ Feedback Inversion for Millimeter Wave ProSe Efficiency

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Solution Overview

Problem

In certain wireless communication networks, particularly those using high carrier frequencies like millimeter wave, ProSe communication for direct UE-to-UE communication operates inefficiently, leading to issues with data transmission and reception, especially in asynchronous and synchronized HARQ modes.

Innovation Solution

The system includes apparatuses and methods for transmitting messages between remote units and base units, where a receiver processes messages to determine transmission criteria, and transmitters send corresponding messages to schedule sidelink communication, using scheduling requests, measurement information, and control signaling to optimize data transmission and feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional DL transmission and UL transmission methods are used in ProSe communication, then standard HARQ procedures can be implemented, but the communication operates inefficiently in high carrier frequency networks

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidcommunication reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent inverts the conventional HARQ feedback mechanism by having the receiving UE (second UE) send the HARQ acknowledgment directly to the transmitting UE (first UE) via sidelink, rather than routing it through the eNB. This inversion resolves the inefficiency of conventional methods in ProSe communication while maintaining reliability through direct feedback.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts the HARQ feedback function from the eNB and relocates it to the second UE. By taking out the feedback routing through the network infrastructure and implementing it directly at the UE level, the system achieves efficient sidelink communication suitable for high carrier frequency networks.

Inventive Principle:

Principle #2Taking out (Extraction)

2Productivity

If HARQ feedback is routed through eNB in ProSe communication, then centralized control is maintained, but transmission delay increases and efficiency decreases

Engineering Contradiction:

Improvefeedback transmission speedVSAvoidround trip time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The second UE acts as an intermediary that directly receives and processes the downlink data and generates HARQ feedback without requiring eNB intervention for the feedback transmission. This intermediary role eliminates the additional routing delay through the eNB while maintaining the centralized scheduling control.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system establishes predetermined rules and configurations for sidelink HARQ operations before communication begins. The UEs are pre-configured with resource allocations and feedback mechanisms, allowing immediate feedback transmission without waiting for eNB scheduling decisions, thus reducing latency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11146346B2Transmitting a message in response to receiving a message

Publication Date: 2021.10.12 MOTOROLA MOBILITY LLC

AI summary

Apparatuses, methods, and systems are disclosed for transmitting a message in response to receiving a message. One apparatus (300) includes a receiver (312) that receives (602) a second message from a second remote unit (200). The second message is transmitted from the second remote unit in response to the second remote unit receiving a first message from a first remote unit. The apparatus (300) includes a transmitter (310) that transmits (604) a third message corresponding to the first message in response to receiving the second message.