HARQ Feedback Retransmission with RRC-Configured Reduced DCI Payloads
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Solution Overview
Problem
Existing wireless communication systems inefficiently utilize resources and consume high power due to redundant control parameters in HARQ feedback retransmissions, particularly in DCI messages, which include multiple control parameters that often remain the same or similar between transmissions.
Innovation Solution
Configuring retransmission parameters via a control message (e.g., RRC message) during connection establishment, allowing UEs to receive or ignore DCI messages with reduced payloads, and using control parameters that include indications of resources, sampling rates, and other settings to optimize power consumption and resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI messages include multiple control parameters for HARQ feedback retransmissions, then the retransmission can be properly configured, but power consumption increases and resource utilization becomes inefficient
Solution Approach 1:
The patent extracts only the essential control parameters needed for HARQ feedback retransmission from the full DCI message. Specifically, it removes redundant parameters such as frequency allocation, modulation and coding scheme, and other non-critical parameters, keeping only the minimum necessary information (such as resource indication and redundancy version) to enable successful retransmission. This extraction reduces the DCI payload size and consequently reduces UE power consumption while maintaining retransmission reliability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring certain control parameters through RRC signaling before the actual DCI transmission. This allows the DCI message to reference pre-agreed parameters rather than transmitting them fully, reducing the immediate power consumption during retransmission while ensuring the parameters are already optimized and configured for the specific retransmission scenario.
2Reliability
If DCI messages include multiple control parameters for HARQ feedback retransmissions, then the retransmission can be properly configured, but resource utilization becomes inefficient
Solution Approach 1:
The patent extracts and removes redundant control parameters from the DCI message payload. By identifying and eliminating parameters that are either already known to the UE or not critical for the specific retransmission operation, the patent reduces the quantity of control parameter data transmitted. This extraction maintains the essential information needed for reliable retransmission while minimizing unnecessary data volume.
Solution Approach 2:
The patent employs a universal parameter structure where certain control parameters are defined to serve multiple functions. For example, a compact resource indication parameter can simultaneously indicate frequency, time, and spatial resources, replacing what would traditionally require multiple separate parameters. This multi-functionality reduces the overall quantity of control parameters needed while ensuring complete retransmission configuration.
3Reliability
If control parameters are transmitted in every DCI message, then the retransmission can be properly configured, but redundant transmissions increase power consumption
Solution Approach 1:
The patent extracts and eliminates redundant parameter transmissions by identifying which parameters remain unchanged across transmissions. These extracted parameters are then omitted from subsequent DCI messages, requiring the UE to rely on previously received parameter values. This approach maintains configuration accuracy for parameters that do change while avoiding the energy waste of retransmitting identical parameter values.
Solution Approach 2:
The patent applies preliminary action by establishing a parameter configuration framework through RRC signaling before DCI transmission. This preliminary configuration includes default values and parameter relationships that eliminate the need to transmit certain parameters in every DCI message. The preliminary setup ensures that when parameters are not explicitly transmitted in DCI, the UE can correctly infer their values, maintaining configuration accuracy without redundant transmissions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control message that includes one or more control parameters associated with retransmissions for feedback messages during a connection establishment procedure, the control parameters including an indication of a resource used for the retransmissions. The UE may transmit a feedback message associated with a first transmission. The UE may receive a retransmission associated with the transmission based on the control parameters from the control message. In some implementations, the UE may also receive a DCI message with a reduced payload (e.g., a payload that excludes the control parameters).