ACK/NACK Signal Transmission Timing in Wireless Communication
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Solution Overview
Problem
In advanced wireless communication systems like LTE-A, low-capacity user equipment faces challenges in transmitting ACK/NACK signals due to limited data processing capabilities and asynchronous data reception across different cells, leading to insufficient decoding times and impaired HARQ performance.
Innovation Solution
A method for transmitting ACK/NACK signals in wireless communication systems, where the user equipment receives a transport block and transmits the ACK/NACK signal in either the first or second subframe based on its size, with the second subframe occurring after the first in the time domain when the transport block exceeds a predetermined value, allowing for efficient HARQ performance even under limited data decoding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACK/NACK timing follows the existing HARQ scheme, then the system maintains standard HARQ performance, but low-capacity user equipment cannot decode large transport blocks within the predetermined time interval
Solution Approach 1:
The patent dynamically adjusts the ACK/NACK transmission timing based on the size of the transport block. When the transport block size exceeds a reference value, the system switches from the standard timing (first subframe) to an extended timing (second subframe), allowing low-capacity user equipment sufficient time to decode large data blocks while maintaining standard timing for smaller blocks
Solution Approach 2:
The system changes the time parameter (ACK/NACK transmission timing) based on the transport block size parameter. By comparing the transport block size with a reference value, the system selects appropriate timing parameters (first subframe for small blocks, second subframe for large blocks), enabling adaptive timing adjustment to match user equipment capabilities
2Adaptability or versatility
If data is received in different cells with asynchronous timing, then carrier aggregation and cross carrier scheduling are supported, but decoding time becomes insufficient due to misaligned reception times
Solution Approach 1:
The system performs preliminary assessment of the transport block size before determining ACK/NACK timing. By evaluating whether the block size exceeds the reference value, the system proactively selects the appropriate timing (extended second subframe for large blocks), ensuring sufficient decoding time is allocated before the actual decoding process begins
Solution Approach 2:
The patent implements dynamic timing adjustment that adapts to the specific requirements of each transport block. The system flexibly switches between standard and extended timing based on real-time conditions (block size), enabling support for asynchronous data reception in carrier aggregation while maintaining adequate decoding time
Data Source
AI summary
The present invention relates to a method and apparatus for transmitting an acknowledgement/not-acknowledgement (ACK/NACK) signal in a wireless communication system. The method includes the steps of: receiving a transmission block; and transmitting an ACK/NACK signal for the transmission block in a first subframe or a second subframe according to the size of the transmission block, wherein, when the size of the transmission block is smaller than or equal to a reference value, the ACK/NACK signal is transmitted in the first frame, when the size of the transmission block is greater than the reference value, the ACK/NACK signal is transmitted in the second subframe, and the second subframe is behind the first subframe in a time domain.