Turbo HARQ Feedback Reporting Mode Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing complexity and power consumption at user equipment (UE) when transmitting both sounding reference signals (SRS) and hybrid automatic repeat request (HARQ) feedback with channel state information (CSI) in the same slot.
Innovation Solution
The system configures the UE to send different information based on its capability, indicating the UE's capability for reference signal reporting, including power and processing capabilities, to the base station. The base station then selects a mode for the UE to use for feedback reporting, such as sending SRS and HARQ feedback with CSI, or reporting CSI without SRS, to optimize resource usage and reduce complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits both SRS and HARQ feedback with CSI in the same slot, then the system achieves comprehensive channel information and reference signal reporting, but the complexity and power consumption at the UE increases significantly
Solution Approach 1:
The patent implements dynamic mode selection where the UE can switch between different feedback reporting modes (full feedback, partial feedback, or SRS-only) based on its current capability state, channel conditions, and scheduling requirements. This dynamic adaptation allows the system to optimize between comprehensive feedback and reduced complexity in real-time
Solution Approach 2:
The system changes the feedback reporting parameters by introducing multiple configurable modes that alter what information is reported (full CSI vs. partial CSI vs. SRS only). The base station can dynamically adjust these parameters through RRC signaling or MAC CE to match current system requirements and UE capabilities
2Reliability
If the UE transmits both SRS and HARQ feedback with CSI in the same slot, then the system achieves comprehensive feedback reporting, but the power consumption at the UE increases significantly
Solution Approach 1:
The patent applies partial action by allowing the UE to report only essential feedback information in certain modes (e.g., SRS only or HARQ without CSI) when full feedback is not required. This partial reporting reduces power consumption while maintaining sufficient system performance for many scenarios
Solution Approach 2:
The dynamic mode selection mechanism enables the UE to adapt its power consumption level by switching between different feedback modes based on battery status, channel conditions, and scheduling requirements, optimizing the trade-off between feedback completeness and energy usage
3Device complexity
If the UE is configured to send different information based on capability indication, then the system optimizes resource usage and reduces UE complexity, but the signaling overhead between UE and base station increases
Solution Approach 1:
The patent implements preliminary action by having the UE indicate its capability preferences in advance through RRC signaling. The base station then uses this pre-indicated capability information to configure appropriate feedback modes, reducing the need for continuous capability negotiation and minimizing signaling overhead during operation
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a UE capability associated with reference signal reporting by the UE. The UE may receive, from the base station, a data packet and an indication of a mode for hybrid automatic repeat request (HARQ) feedback reporting based on the UE capability. The UE may determine that a slot includes first resources for transmitting a sounding reference signal (SRS) and second resources for transmitting HARQ feedback for the data packet. The UE may transmit, to the base station during the slot and based on the indication of the mode for HARQ feedback reporting, the HARQ feedback and one or more of the SRS or CSI associated with the HARQ feedback.