ACK/NAK Signal Repetition for Wireless Reliability
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Solution Overview
Problem
In wireless communication systems, particularly SC-FDMA, the transmission of ACK/NAK signals over multiple sub-frames faces challenges in ensuring reliable reception and avoiding interference with other signals, especially for UEs operating under low SINR conditions or in coverage-limited areas, where nominal transmission periods may not provide adequate reception reliability.
Innovation Solution
The method involves enabling repetitions of dynamic or periodic ACK/NAK signals over multiple sub-frames, with specific mechanisms for dynamic and periodic transmissions, and determining PUCCH resources to avoid interference, allowing ACK/NAK transmissions to complete while maintaining stable system operation. This includes configuring UEs to use the same RB for ACK/NAK repetitions and suspending other data or control signal transmissions during repeated sub-frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK/NAK signals are transmitted over multiple sub-frames to improve reception reliability, then the total received SINR increases, but the system complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the ACK/NAK transmission into multiple sub-frames, allowing the signal to be transmitted repeatedly over time. Each sub-frame carries the same ACK/NAK signal, and the receiver combines these repetitions to improve reception reliability. This segmentation approach directly addresses the contradiction by dividing a single complex transmission into multiple simpler, manageable transmissions across different time intervals.
Solution Approach 2:
The patent implements periodic transmission of ACK/NAK signals across multiple sub-frames. The same acknowledgment signal is transmitted at regular intervals (periodically) over multiple sub-frames, allowing the receiver to accumulate signal energy and improve SINR. This periodic action resolves the contradiction by using time-repeated transmissions rather than a single complex transmission.
2Reliability
If ACK/NAK transmissions are repeated over multiple sub-frames, then reception reliability improves, but interference with other signals increases
Solution Approach 1:
The patent extracts and suspends other data or control signal transmissions during the sub-frames allocated for ACK/NAK repetitions. By removing (taking out) potential interfering signals from the time resources used for ACK/NAK transmission, the system ensures that the repeated ACK/NAK signals experience minimal interference. This extraction approach directly resolves the contradiction between reliability improvement and interference reduction.
Solution Approach 2:
The patent applies preliminary anti-action by suspending other signal transmissions before they can interfere with the ACK/NAK repetitions. The system proactively prevents interference by not allowing other data or control signals to be transmitted during the sub-frames dedicated to ACK/NAK signal repetitions. This preliminary prevention resolves the contradiction by eliminating the source of interference before it can affect the ACK/NAK reception.
3Object-affected harmful factors
If other data or control signals are suspended during ACK/NAK repetition sub-frames, then interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the resource allocation flexible and adaptive. Instead of permanently dedicating resources to ACK/NAK repetitions, the system dynamically suspends other signal transmissions only during the specific sub-frames where ACK/NAK repetitions occur. This dynamic time-sharing approach allows the system to maintain high resource utilization efficiency while reducing interference, resolving the contradiction between interference reduction and productivity.
Data Source
AI summary
A method for transmitting an acknowledgement signal by a user equipment (UE) in a communication system is provided. The method includes transmitting a first acknowledgement signal corresponding to a first data packet in first transmission time intervals (TTIs), wherein transmission of another signal excluding the first acknowledgement signal in the first TTIs is prohibited.