Wireless Access Method With Mini-Slot Control Transmission
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Solution Overview
Problem
The 5G communication system faces challenges in achieving low latency while maintaining system complexity and avoiding multi-path fading, particularly in applications requiring latency less than 100 μs, due to increased hardware complexity and susceptibility to interference with larger sub-carrier spacing.
Innovation Solution
A wireless access method that transmits first and second control information through different frequency bands with a time difference less than a slot time, allowing for reduced waiting time and latency, while using carrier aggregation technology to select suitable bandwidth parts or component carriers for reduced waiting time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If larger sub-carrier spacing is adopted to shorten slot duration, then latency is reduced, but multi-path fading worsens and interference between symbols occurs
Solution Approach 1:
The patent segments the transmission time by introducing a mini-slot structure within the slot, allowing control information to be transmitted in shorter time intervals (e.g., 2-3 OFDM symbols) rather than waiting for the complete slot. This segmentation enables low-latency transmission while maintaining the original slot structure and its associated frequency spacing, thus avoiding multi-path fading issues.
Solution Approach 2:
The patent introduces a new time dimension by allowing control information transmission at flexible positions within the slot (different start symbols and lengths), creating multiple transmission opportunities within a single slot. This dimensional flexibility enables the system to achieve low latency without changing the fundamental slot structure or sub-carrier spacing.
2Loss of time
If larger sub-carrier spacing is adopted to reduce latency, then slot interval is reduced, but hardware complexity of transceiver increases
Solution Approach 1:
The patent makes the control information transmission dynamic by allowing flexible configuration of mini-slot positions, durations, and frequencies within each slot. This dynamic approach allows the system to adapt transmission parameters based on traffic conditions without requiring fixed high-rate transmission hardware, thus reducing transceiver complexity while maintaining low latency.
3Device complexity
If control information is transmitted only in specific slot positions, then system complexity is maintained, but waiting time increases
Solution Approach 1:
The patent prepares multiple pre-configured mini-slot options within each slot (different start positions and durations) that can be quickly selected based on traffic conditions. This preliminary preparation allows the system to immediately transmit control information when needed without complex real-time scheduling decisions, reducing waiting time while keeping system complexity manageable.
Data Source
AI summary
A wireless access method for a communication system is provided. The wireless access method is adapted to a base station, and includes the following steps. A first control information is transmitted through a first frequency band. A second control information is transmitted through a second frequency band. The time difference between the transmission time points of the first control information and the second control information is less than a slot time, and the first frequency band is different from the second frequency band.