Wireless Device Acknowledgment Transmission via Subframe Segmentation
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Solution Overview
Problem
In wireless communications networks, particularly under poor signal conditions, the repetition of acknowledgment (ACK) or negative acknowledgment (NAK) information can lead to collisions when sent in response to consecutively received pieces of downlink data, reducing reliability in receiving acknowledgment information.
Innovation Solution
The method involves configuring mobile stations to send repeated instances of ACK/NAK information in specific frame structures, using formats that allow multiple ACK/NAKs to be transmitted together, such as format 1b with QPSK modulation, to avoid collisions and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile station sends repeated instances of ACK/NAK information in response to downlink data, then the reliability of acknowledgment transmission is improved, but collisions may occur between acknowledgment information for consecutively received pieces of data
Solution Approach 1:
The patent segments the transmission of acknowledgment information by assigning different time resources (subframes) to different downlink data pieces. Instead of sending all repetitions simultaneously, the mobile station divides the acknowledgment transmissions across multiple subframes, thereby avoiding collisions while maintaining repetition for reliability.
Solution Approach 2:
The patent introduces a time dimension to the acknowledgment transmission by using multiple subframes with different timing offsets. By spreading repetitions across different time slots rather than concentrating them in a single collision-prone moment, the system resolves the contradiction between needing repetitions for reliability and avoiding collisions.
2Reliability
If ACK/NAK repetition is used to improve reliability in poor wireless conditions, then the likelihood of successful reception is improved, but the complexity of managing multiple frame structures increases
Solution Approach 1:
The patent changes the timing parameter (subframe offset) based on the downlink data reception pattern. By dynamically adjusting which subframes carry repetitions versus new acknowledgments, the system maintains reliability without requiring complex manual configuration of frame structures.
Solution Approach 2:
The patent implements dynamic acknowledgment transmission where the mobile station adapts its repetition strategy based on real-time conditions. Instead of static frame structure assignments, the system dynamically selects which subframes to use for repetitions, reducing complexity while maintaining reliability.
Data Source
AI summary
In general, to provide acknowledgment information by a first wireless device, the first wireless device sends repeated instances of acknowledgment information in respective first and second frame structures, in response to receipt of first information from a second wireless device. In addition, the first wireless device also sends further acknowledgment information in the second frame structure that is responsive to second information received from the second wireless device.