Sidelink Feedback Resource Allocation for HARQ-ACK and CSI
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Solution Overview
Problem
Current sidelink communication technologies, particularly V2X, lack an effective method for implementing feedback of HARQ-ACK and channel state information, which affects spectral efficiency and the ability to support high data rate services.
Innovation Solution
A method for determining feedback resources based on received indication information, allowing UEs to transmit HARQ-ACK and channel state information on uplink or sidelink channels, optimizing the mode of sidelink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If broadcast transmission mode is used in sidelink communication to reduce system complexity, then device complexity is reduced, but spectral efficiency deteriorates due to lack of feedback mechanism
Solution Approach 1:
The patent introduces dynamic feedback mechanisms that allow the system to adapt between broadcast and unicast modes based on service requirements. The feedback resource allocation is dynamically configured through RRC signaling, enabling the system to switch between feedback modes (ACK/NACK, CSI, etc.) depending on the communication scenario, thus resolving the contradiction between simplicity and efficiency
Solution Approach 2:
The patent changes the parameter of feedback resource allocation by introducing configurable feedback resource indicators through RRC signaling. This allows the system to adjust feedback-related parameters (such as feedback resource position, feedback type, and resource allocation) to optimize spectral efficiency while maintaining manageable system complexity through standardized configuration procedures
2Loss of information
If feedback mechanism is introduced in sidelink communication to improve spectral efficiency, then spectral efficiency is improved, but device complexity increases due to additional feedback processing
Solution Approach 1:
The patent uses RRC signaling as an intermediary to configure feedback resources between the network and UEs. This intermediary mechanism allows the complex feedback resource allocation to be managed centrally through standardized signaling procedures, reducing the burden on individual UEs and making the overall system complexity manageable while enabling sophisticated feedback mechanisms
Solution Approach 2:
The patent creates a universal feedback resource allocation mechanism that can serve multiple functions: supporting both broadcast and unicast modes, accommodating different feedback types (HARQ-ACK, CSI, SR), and working with various service requirements. This multi-functional approach consolidates complexity into a unified framework rather than requiring separate mechanisms for each scenario
3Productivity
If unicast mode is used to support high data rate services, then data rate capability is improved, but the ability to implement feedback mechanisms deteriorates due to lack of standardized feedback resources
Solution Approach 1:
The patent applies preliminary action by pre-configuring feedback resources through RRC signaling before actual data transmission occurs. The feedback resource indicators are established in advance, allowing UEs to immediately use unicast mode with full feedback capability when high data rate services are initiated, without needing to negotiate feedback resources in real-time
Data Source
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AI summary
The present application relates to the field of communication technologies, and relates to a method for processing information and a terminal device, the method for processing information includes: determining a corresponding feedback resource based on received indication information; receiving sidelink data transmitted by a second UE; and, transmitting feedback information of the sidelink data on the sidelink data. In the present application, the problem of implementing feedback of HARQ-ACK information and channel state information in the sidelink communication is addressed, and the mode of transmitting the sidelink data is further optimized, thereby improving spectral efficiency on the sidelink channel.