HD-FDD Control Channel Bundle Status Indicators
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Solution Overview
Problem
Current wireless telecommunications systems face inefficiencies in supporting a wide range of devices, including low complexity IoT devices, due to limitations in half-duplex frequency division duplexing (HD-FDD) mechanisms, such as HARQ-ACK bundling, which leads to unnecessary retransmissions and uncertainty about received data channels.
Innovation Solution
The introduction of a PDSCH bundle status indicator (PBS) in control channels to provide End of Bundle (EOB), Start of Bundle (SOB), and Switch indicators, allowing devices to accurately track bundle status and reduce retransmissions by indicating the start, end, and middle of data channel bundles, thereby optimizing data transmission and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HARQ-ACK bundling is used in HD-FDD systems, then device complexity is reduced, but throughput decreases due to unnecessary retransmissions
Solution Approach 1:
The patent segments the bundled HARQ-ACK feedback into individual ACK/NACK responses for each data channel within the bundle. Instead of sending a single bundled acknowledgment, the system now provides granular feedback that allows the transmitter to identify exactly which data channels were successfully received and which require retransmission, thereby eliminating unnecessary retransmissions while maintaining device complexity at acceptable levels.
Solution Approach 2:
The patent introduces enhanced feedback mechanisms that provide detailed information about the reception status of each data channel in the bundle. This includes sending individual ACK/NACK signals for each channel and implementing feedback timing adjustments that allow receivers to process and report on multiple channels separately, enabling more efficient retransmission decisions.
2Productivity
If larger data bundles are transmitted in HD-FDD systems, then throughput increases, but delay increases due to uncertainty about received channels
Solution Approach 1:
The patent implements enhanced feedback timing mechanisms that allow receivers to process larger data bundles and provide timely, granular acknowledgment information. By sending individual ACK/NACK signals for each channel within the bundle and adjusting feedback timing, the system enables transmitters to quickly identify and retransmit only the necessary channels, reducing overall delay despite handling larger bundles.
Solution Approach 2:
The patent applies preliminary actions by pre-configuring feedback timing and acknowledgment structures that prepare the system for efficient handling of large data bundles. The enhanced feedback mechanism is established in advance, allowing the system to process and acknowledge multiple channels systematically without introducing additional delay during actual data transmission.
3Device complexity
If HD-FDD mechanisms are used to support low complexity IoT devices, then device complexity is reduced, but power consumption increases due to retransmissions
Solution Approach 1:
The patent segments the acknowledgment feedback to provide precise information about which data channels require retransmission. This granular feedback approach allows transmitters to avoid unnecessary retransmissions of successfully received channels, thereby reducing the number of retransmission cycles and associated power consumption while keeping device complexity manageable through structured feedback protocols.
Solution Approach 2:
The enhanced feedback mechanism provides detailed reception status information that enables more efficient retransmission decisions. By sending individual ACK/NACK signals for each data channel, the system minimizes redundant transmissions and optimizes power usage, particularly benefiting battery-constrained IoT devices that rely on HD-FDD mechanisms.
Data Source
AI summary
An infrastructure equipment that transmits signals representing data via a wireless access interface to a communications device and receives signals representing data via the wireless access interface from the communications device in accordance with a time divided structure in which the wireless access interface is divided into a plurality of repeating time units. The infrastructure equipment provides, in each of a first plurality of the time units, one of a plurality of control channels each configured to schedule one of a plurality of data channels, and provides, in each of a second plurality of time units of the signal transmitted to the communications device, one of the plurality of data channels, the plurality of data channels being formed of one or more bundles of data channels, wherein the infrastructure equipment transmits a bundle status indicator in one or more of the plurality of control channels.