Uplink Control Information Orthogonal Sequences for Wireless Multiplexing
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Solution Overview
Problem
In SC-FDMA-based wireless communication systems, existing technologies face challenges in efficiently multiplexing Channel Sounding Reference Signals (CS RS) with other uplink control channels while maintaining constant resource allocation bandwidth, leading to interference and complexity in generating additional RS signals.
Innovation Solution
The method involves applying length-3 or length-4 orthogonal sequences to uplink control information in specific slots, allowing for separate transmission of CS RS and ACK/NACK channels with consistent transmission capacity, and using cyclic shifting of ZC sequences for multiplexing, ensuring constant bandwidth allocation and orthogonality between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Channel Sounding Reference Signals (CS RS) are multiplexed with other uplink control channels in SC-FDMA-based wireless communication systems, then resource allocation efficiency is improved, but interference between channels occurs and generation of additional RS signals becomes complex
Solution Approach 1:
The patent segments the uplink transmission by separating control channel transmissions into different slots. Specifically, ACK/NACK channels are transmitted in even-numbered slots while CS RS are transmitted in odd-numbered slots, eliminating the need for complex signal generation and multiplexing while improving resource allocation efficiency
Solution Approach 2:
The patent implements periodic transmission patterns where ACK/NACK channels are transmitted in even slots and CS RS are transmitted in odd slots. This periodic alternation simplifies the system by avoiding simultaneous multiplexing operations, thereby reducing the complexity of generating additional RS signals while maintaining efficient resource utilization
2Productivity
If CS RS and ACK/NACK channels are transmitted in the same slot, then resource utilization is improved, but channel capacity consistency deteriorates
Solution Approach 1:
The patent divides time resources into alternating slot types: even slots are dedicated to ACK/NACK channel transmissions and odd slots are dedicated to CS RS transmissions. This segmentation ensures that each channel type maintains consistent transmission capacity in its designated slots while achieving overall efficient resource utilization through systematic time-division multiplexing
3Productivity
If multiple uplink control channels are multiplexed together, then transmission capacity is improved, but interference between channels increases
Solution Approach 1:
The patent extracts and separates the CS RS transmission from the ACK/NACK channel transmission by allocating them to different time slots. This extraction eliminates mutual interference between the channels while maintaining high transmission capacity through systematic time-division multiplexing, where even slots handle ACK/NACK and odd slots handle CS RS
Data Source
AI summary
Methods and apparatuses are provided for transmitting uplink control information by a terminal in a wireless communication system. System information associated with an uplink transmission of a reference signal is received from a base station. Uplink control information to which a length-3 orthogonal sequence or a length-4 orthogonal sequence is applied is transmitted in a slot of a sub-frame. The reference signal is transmitted based on the received system information.