Variable Processing Time for Wireless HARQ Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing transmission and reception timing for data using Hybrid Automatic Repeat Request (HARQ) procedures, especially when dealing with different lengths of transmission time intervals (TTIs) for uplink and downlink channels, leading to unnecessary latency.
Innovation Solution
A method is proposed to configure the processing times for downlink and uplink channels based on their respective TTIs, allowing for flexible timing adjustments to optimize transmission and reception timing in HARQ procedures, thereby reducing latency by considering additional processing time for feedback and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fixed processing time is used for HARQ procedures, then system simplicity is maintained, but latency increases due to inability to adapt to different TTI lengths
Solution Approach 1:
The patent applies dynamics by making the processing time variable rather than fixed. The processing time is dynamically adjusted based on the TTI length and channel type (downlink or uplink), allowing the system to adapt timing configurations to different transmission scenarios and reduce latency without excessive complexity
Solution Approach 2:
The patent changes the parameter of processing time from a fixed value to a variable that depends on TTI length and channel direction. By defining processing time as a function of these parameters, the system achieves flexible timing adaptation while maintaining manageable complexity through standardized configuration rules
2Productivity
If different TTI lengths are configured for uplink and downlink, then transmission efficiency is improved, but timing synchronization becomes more difficult
Solution Approach 1:
The patent applies local quality by defining separate processing time configurations for downlink and uplink channels. Each channel type has its own optimized processing time based on its specific TTI length and characteristics, allowing efficient local adaptation without requiring complex global synchronization mechanisms
Solution Approach 2:
The patent segments the timing configuration into distinct components for downlink and uplink. By separating the processing time definitions for each direction and configuring them independently based on respective TTI lengths, the system manages timing synchronization complexity through modular configuration
Data Source
AI summary
Disclosed are a method for transmitting and receiving data in a wireless communication system supporting a short transmission time interval (TTI) and an apparatus therefor. Specifically, the method may comprise the steps of: receiving a downlink control channel for which a first TTI is configured; and transmitting a specific uplink channel for which a second TTI is configured, on the basis of the received downlink control channel, wherein the first TTI and the second TTI are configured to have different lengths, the specific uplink channel is transmitted through a subframe after a specific processing time from the end point of a resource region allocated to the downlink control channel, and the specific processing time is set according to at least one of a first processing time for the downlink control channel and a second processing time for the specific uplink control channel.