HARQ-ACK Bundling Control with PDSCH Bundle Status Indicators
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Solution Overview
Problem
Current wireless telecommunications systems face inefficiencies in supporting a wide range of devices, including IoT and MTC devices, due to limitations in half-duplex frequency division duplexing (HD-FDD) mechanisms, such as HARQ-ACK bundling, which leads to unnecessary retransmissions and unclear detection of missing data channels.
Innovation Solution
The introduction of a PDSCH bundle status indicator (PBS) in the DCI, which includes End of Bundle (EOB), Start of Bundle (SOB), and Middle of Bundle (MOB) indicators, allows the UE to accurately track bundle status, reducing retransmissions and improving throughput by enabling precise feedback timing and bundle division without additional delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If HARQ-ACK bundling is used in HD-FDD systems, then device complexity is reduced and power consumption decreases, but throughput is limited and unnecessary retransmissions occur
Solution Approach 1:
The patent segments data channel bundles into multiple groups and introduces bundle status indicators (BSI) to track each group separately. This segmentation allows the system to maintain the power efficiency of bundling while improving throughput by identifying and retransmitting only specific failed groups rather than retransmitting entire bundles, thus resolving the contradiction between reduced power consumption and maintained throughput.
2Measurement precision
If data channels are formed in bundles, then detection accuracy improves, but clarity in detecting missing data channels deteriorates
Solution Approach 1:
The patent implements feedback mechanisms through bundle status indicators (BSI) that provide explicit information about the status of each data channel bundle group. The BSI feedback allows the receiving device to clearly identify which specific groups were successfully received and which require retransmission, thereby maintaining detection accuracy while preventing information loss about missing channels.
3Productivity
If bundle status indicators are transmitted, then retransmission efficiency improves, but control channel overhead increases
Solution Approach 1:
The patent applies partial action by transmitting bundle status indicators selectively - only for data channel bundles that require acknowledgment or retransmission. Rather than transmitting BSI for every possible bundle, the system transmits BSI only when necessary, thereby improving retransmission efficiency while minimizing control channel overhead through targeted rather than universal indicator transmission.
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.