Uplink FDD Subframe Control Information Timing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control information, such as Channel Quality Indicator (CQI) and Acknowledgement (ACK) information, in uplink frequency-division duplex (FDD) subframes, particularly in terms of latency and resource allocation, which affects communication efficiency and user experience.
Innovation Solution
The proposed solution involves a wireless communication apparatus and method that utilize a transceiver, processor, and memory to transmit and receive control information in specific frequency ranges, where CQI information is sent prior to a first demodulation reference signal (DMRS) and ACK information is sent subsequent to a second DMRS, optimizing the timing and resource allocation within the UL FDD subframe structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control information is transmitted in traditional uplink FDD subframe structures, then resource allocation is maintained, but latency is increased and communication efficiency is reduced
Solution Approach 1:
The patent segments control information into different types (CQI, ACK, SR) and assigns them to different time positions within the uplink subframe relative to DMRS symbols. This segmentation allows optimized positioning for each control information type, reducing overall latency while maintaining proper resource allocation and communication efficiency.
2Productivity
If control information timing is optimized for lower latency, then turnaround time improves, but resource allocation complexity increases
Solution Approach 1:
The patent establishes predetermined rules for positioning control information relative to DMRS symbols. By defining these positioning rules in advance (CQI before first DMRS, ACK after second DMRS), the system achieves fast turnaround time without requiring complex real-time resource allocation decisions, thus reducing operational complexity.
3Measurement precision
If control information is positioned closer to reference signals, then channel estimation accuracy improves, but interference between control signals increases
Solution Approach 1:
The patent applies different positioning strategies for different control information types based on their specific requirements. CQI information is positioned before the first DMRS for accurate channel estimation, while ACK information is positioned after the second DMRS to minimize interference. This localized optimization for each control signal type achieves both accurate channel estimation and reduced interference.
Data Source
AI summary
Various aspects provide a subframe for uplink (UL) communication in a frequency-division duplex (FDD) configuration. Control information in the frequency range of the UL communication may include channel quality indicator (CQI) and acknowledgement (ACK) information. The CQI information may be provided prior to a demodulation reference signal (DMRS). The ACK information may be provided subsequent to another DMRS. The CQI information may be time-division multiplexed in a common frequency range as the ACK information. A sounding reference signal (SRS) may be provided as an initial symbol of the subframe. Some CQI information may be provided in two or more separate portions that are each prior to a separate DMRS. Some ACK information may be provided in two or more separate portions that are each subsequent to another separate DMRS.