Uplink Carrier Feedback Transmission for Multi-Carrier Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting feedback information across multiple carriers, particularly in uplink channels, which can lead to suboptimal data transmission reliability and resource allocation.
Innovation Solution
The techniques described involve using Single-Carrier Frequency Division Multiple Access (SC-FDMA) to transmit feedback information on uplink carriers, allowing for flexible mapping of acknowledgement (ACK) and channel quality indicator (CQI) information across multiple downlink carriers, enabling efficient and reliable feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is transmitted using traditional multi-carrier methods, then coverage is provided, but transmission efficiency and reliability are suboptimal
Solution Approach 1:
The patent segments feedback information transmission by dedicating specific uplink carriers to feedback transmission while other carriers handle data traffic. This segmentation allows feedback to be transmitted reliably on designated carriers while maintaining overall system productivity through parallel data transmission on other carriers.
Solution Approach 2:
The patent introduces SC-FDMA as an intermediary modulation scheme specifically for feedback information transmission on designated uplink carriers. This intermediary approach provides the frequency diversity and robustness needed for reliable feedback transmission while maintaining compatibility with the overall OFDMA-based system architecture.
2Reliability
If multiple uplink carriers are used for feedback transmission, then reliability improves through diversity, but system complexity increases
Solution Approach 1:
The patent establishes universal rules and criteria for selecting uplink carriers for feedback transmission that can be applied across different scenarios and carrier configurations. These universal selection criteria simplify the complexity by providing a standardized approach rather than requiring complex scenario-specific decision logic.
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors the performance of designated feedback carriers and can dynamically adjust carrier selections based on observed transmission conditions. This feedback-driven approach simplifies complexity by using empirical performance data rather than complex predictive models.
Data Source
AI summary
Techniques for sending feedback information for multi-carrier operation are described. In an aspect, feedback information may be sent on an uplink carrier that may or may not be paired with a downlink carrier on which data transmission is sent. A user equipment (UE) may receive data transmission on a downlink carrier among a plurality of downlink carriers. The UE may determine feedback information for the data transmission, determine an uplink carrier to use to send the feedback information from among a plurality of uplink carriers, and send the feedback information on the uplink carrier. In another aspect, feedback information for multiple downlink carriers may be sent on at least one uplink carrier using Single-Carrier Frequency Division Multiple Access (SC-FDMA). A UE may receive data transmissions on a plurality of downlink carriers, determine feedback information for the data transmissions, and send the feedback information on at least one uplink carrier using SC-FDMA.