HARQ Feedback Timing Negotiation in mmWave Sidelink
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Solution Overview
Problem
In wireless communication systems, particularly in mmWave beam-based sidelink communication, HARQ feedback transmission times often collide, leading to unreliable data transfer and increased latency, as existing methods fail to efficiently manage beam alignment and resource allocation for terminal-to-terminal communication.
Innovation Solution
A method is introduced to determine and modify HARQ feedback transmission times based on resource pool information and physical sidelink feedback channel configuration, using negotiation messages to align beam directions between transmission and reception terminals, ensuring non-colliding feedback times and optimizing channel environment considerations for retransmission resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback transmission times are determined based on existing methods in mmWave beam-based sidelink communication, then communication capacity is increased, but HARQ feedback transmission times collide leading to unreliable data transfer and increased latency
Solution Approach 1:
The patent introduces a negotiation mechanism where terminals exchange feedback messages to determine HARQ feedback transmission times. The receiving terminal sends a first feedback message to the transmitting terminal, and the transmitting terminal responds with a second feedback message containing the determined HARQ feedback transmission time, ensuring collision-free transmission while maintaining high communication capacity
Solution Approach 2:
The patent dynamically adjusts the HARQ feedback transmission time parameter based on beam alignment status and resource pool configuration. By changing this timing parameter through negotiation between terminals, the system avoids feedback collisions while preserving high data transfer reliability in mmWave beam-based communication
2Device complexity
If HARQ feedback transmission times are determined based on existing methods, then resource allocation is simplified, but latency increases due to feedback collisions
Solution Approach 1:
The patent performs preliminary negotiation to determine HARQ feedback transmission times before actual data transmission. By pre-coordinating feedback timing through exchange of feedback messages, the system eliminates latency caused by feedback collisions while maintaining manageable resource allocation complexity
3Reliability
If beam alignment is performed between transmission and reception terminals, then communication reliability is improved, but feedback transmission time collision occurs
Solution Approach 1:
The patent uses feedback messages as an intermediary mechanism to coordinate HARQ feedback transmission times. The receiving terminal sends a first feedback message and the transmitting terminal sends a second feedback message with the agreed transmission time, acting as a mediator to resolve timing conflicts while maintaining beam alignment reliability
Data Source
AI summary
Provided is a method for receiving a signal by a terminal in a wireless communication system, the method comprising: receiving first data from a first transmission terminal and determining a HARQ feedback transmission time for the first data; receiving second data from a second transmission terminal and determining a HARQ feedback transmission time for the second data, wherein the first transmission terminal is aligned with the reception terminal by a first beam and the second transmission terminal is aligned with the reception terminal by a second beam; and based on the HARQ feedback transmission time for the first data and the HARQ feedback transmission time for the second data being identical with each other, modifying the HARQ feedback transmission time for the first data and transmitting, to the first transmission terminal, a negotiation message for indicating the HARQ feedback transmission time modification.