Group Acknowledgement Buffering for Wireless HARQ Feedback
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Solution Overview
Problem
In advanced wireless communication systems, transmitting hybrid automatic repeat request (HARQ) feedback and channel state information (CSI) from user equipment (UE) to a base station using conventional methods can be unreliable, especially when clear channel assessment is not clear or no uplink subframes are available, and aperiodic CSI reports may have a large payload.
Innovation Solution
The method involves buffering CSI and/or acknowledgements/negative acknowledgements (ACK/NACKs) as a group acknowledgement/negative acknowledgement (GACK) at the UE until a downlink control information (DCI) trigger is received from the base station, allowing reliable communication of HARQ feedback and CSI while reducing payload by transmitting the GACK when a threshold is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback and CSI are transmitted using conventional methods in predetermined uplink subframes, then the transmission follows standard protocol, but the transmission becomes unreliable when clear channel assessment does not clear or no uplink subframes are available
Solution Approach 1:
The patent implements dynamic transmission timing by allowing HARQ feedback and CSI to be transmitted in flexible uplink subframes rather than fixed predetermined subframes. The transmission timing adapts based on clear channel assessment results and availability of uplink subframes, resolving the contradiction between following standard protocol and adapting to channel conditions.
Solution Approach 2:
The patent changes the transmission parameters by introducing a threshold-based mechanism where the decision to transmit HARQ feedback and CSI depends on comparing channel quality metrics against a threshold. This parameter-based adaptation enables reliable transmission by adjusting transmission behavior based on real-time channel conditions.
2Loss of information
If aperiodic CSI reports are transmitted to provide comprehensive channel state information, then the reporting is thorough, but the payload size becomes large making transmission unreliable
Solution Approach 1:
The patent extracts and transmits only the essential HARQ feedback and CSI information rather than complete aperiodic CSI reports. By selecting and transmitting only the most critical channel state information and acknowledgment data, the patent reduces payload size while maintaining the essential information needed for reliable communication.
Solution Approach 2:
The patent applies partial action by transmitting a subset of the full CSI report content - specifically focusing on HARQ feedback and key channel state indicators - rather than transmitting the complete aperiodic CSI report. This partial transmission approach reduces payload size and improves reliability while still providing sufficient information for effective communication.
Data Source
AI summary
According to the present disclosure, CSI and/or a plurality of ACKs related to a group of DL data transmissions may be buffered at the UE as a GACK until a DCI trigger is received from the eNB. Once the trigger is received, the UE may transmit the CSI and/or GACK to the eNB. In this way HARQ feedback and/or CSI may be reliably communicated while reducing payload. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus send, to a UE, data transmissions associated with a first plurality of downlink subframes. In an aspect, the apparatus increments a counter for each data transmission sent to the UE. In a further aspect, the apparatus transmits, to the UE, a first trigger for a first GACK when a counter is greater than or equal to a threshold.