Uplink Control Signal Transmission Using Predefined Sequences
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Solution Overview
Problem
The existing LTE/LTE-A systems face challenges in reducing air interface time delay, which is critical for supporting advanced services like Internet of Vehicles and industrial automation, due to the limitations of the current Physical Uplink Control Channel (PUCCH) structure and the overhead of Reference Symbols, especially when attempting to shorten the Transmission Time Interval (TTI).
Innovation Solution
A method and device for uplink control signal transmission that involves sending predefined sequences on reduced TTI symbols, where K predefined sequences are mapped to M transmission symbols, allowing for efficient transmission of B-bit uplink control information, thereby reducing data transmission time delay and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the TTI length is reduced to achieve ultra-low time delay, then the air interface time delay is reduced, but the overhead of Reference Symbols becomes too large and the existing PUCCH transmission structure cannot be directly used
Solution Approach 1:
The patent changes the fundamental parameters of the PUCCH transmission structure by using predefined sequences with lengths that are powers of 2 (N=2^n) mapped to reduced TTI symbols. This parameter change enables the system to accommodate shorter TTI lengths while maintaining efficient reference symbol overhead and simplifying the transmission structure for ultra-low latency operation.
Solution Approach 2:
The patent segments the uplink control information transmission by dividing it into multiple predefined sequences that are separately mapped to different transmission symbols within the reduced TTI. This segmentation allows flexible allocation of reference symbols and data symbols, reducing overhead while maintaining reliability in the shortened TTI structure.
2Speed
If the number of symbols in TTI is reduced to achieve faster transmission, then the time delay is reduced, but the overhead of Reference Symbols becomes excessive
Solution Approach 1:
The patent applies partial action by using a minimal sufficient number of reference symbols within the reduced TTI structure. Instead of maintaining the same reference symbol density as longer TTIs, the system uses just enough reference symbols (embedded within the predefined sequence structure) to maintain acceptable demodulation performance while minimizing overhead in the compressed time frame.
3Device complexity
If predefined sequences are mapped to reduced TTI symbols for efficient control information transmission, then demodulation complexity is simplified, but the mapping structure becomes more constrained
Solution Approach 1:
The patent creates a universal mapping structure where predefined sequences of length N=2^n can be mapped to various reduced TTI configurations (different numbers of symbols and subcarriers). This universal approach simplifies demodulation through non-coherent detection while maintaining adaptability to different TTI lengths and control information types through the flexible sequence selection and mapping parameters.
Data Source
AI summary
Disclosed are a method and device for uplink control signal transmission, a user terminal and a storage medium. The method includes: sending, by the user terminal, K predefined sequences on M transmission symbols in a Transmission Time Interval (TTI) to transmit B-bit uplink control information, wherein M is a positive integer, K is an integer, 1≤K≤2B, the B is an integer greater than or equal to 1, one of the K predefined sequences is sent on each of the M transmission symbols, the predefined sequences have a length of N and are mapped to N subcarriers of corresponding transmission symbols, N=2n with n being a positive integer.