Uplink Control Information Frequency Hopping for Short TTI Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency, particularly in uplink transmission operations, as they struggle to support multiple transmission time intervals, subcarrier spacings, and processing times, which hinders faster internet access and improved performance in next-generation mobile communication systems.
Innovation Solution
The implementation of a method that enables frequency hopping for uplink control information in a wireless communication system, allowing for the mapping of control information onto a short physical uplink control channel resource region with different patterns in each slot of a subframe, and configuring power transient periods to optimize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If frequency hopping is enabled for uplink control information with different patterns in first and second slots, then the system can support multiple transmission time intervals and reduce latency, but the complexity of the transmission operation increases
Solution Approach 1:
The subframe is divided into first and second slots with different frequency hopping patterns. The first slot uses one hopping pattern while the second slot uses another pattern, allowing the system to support multiple transmission time intervals (sTTI) within a single subframe. This segmentation enables flexible TTI configuration without requiring complete system redesign, thus reducing latency while managing complexity through structured division.
Solution Approach 2:
The frequency hopping pattern is made dynamic by allowing different patterns in different slots. The system can adapt the hopping pattern based on the specific TTI requirements of each slot, enabling support for various sTTI lengths (e.g., 2-symbol, 3-symbol, 4-symbol TTIs) within the same subframe. This dynamic approach allows the system to optimize latency for different transmission scenarios without fixing a single rigid pattern.
2Adaptability or versatility
If frequency hopping patterns are configured for multiple TTI lengths in one subframe, then the system supports plurality of transmission time intervals, but the configuration and control complexity increases
Solution Approach 1:
The frequency hopping mechanism is designed to serve multiple functions simultaneously. By configuring different hopping patterns for first and second slots, the system can support various sTTI lengths (2-symbol, 3-symbol, 4-symbol) within a single subframe. This multi-functional design allows one hopping mechanism to handle multiple TTI requirements without needing separate mechanisms for each TTI type, thereby achieving versatility while managing configuration complexity through unified control.
3Productivity
If power transient period is configured in a slot with larger number of symbols, then transmission efficiency is optimized, but the flexibility in TTI configuration is reduced
Solution Approach 1:
The power transient period is locally configured in specific slots based on their characteristics. When a slot has a larger number of symbols, the power transient period is positioned in that slot to optimize transmission efficiency for longer TTIs. This local quality approach allows the system to adapt the power transient timing to the specific TTI requirements of each slot, achieving efficient transmission while maintaining flexibility through slot-specific configuration rather than uniform rules.
Data Source
AI summary
An uplink transmitting method for a user equipment (UE) for supporting a short transmission time interval (TTI) length in a wireless communication system is performed by the UE and includes receiving an enable or disable configuration of frequency hopping for uplink control information, when the frequency hopping is enabled, mapping the uplink control information to a short physical uplink control channel (SPUCCH) resource region using the frequency hopping, and transmitting the uplink control information in the SPUCCH resource region, wherein the frequency hopping has different patterns in first and second slots.