Sidelink Control Information for No-Data Channel Feedback
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing sidelink control information transmission without accompanying sidelink data, leading to suboptimal resource utilization and potential interference.
Innovation Solution
Implementing a method and apparatus for transmitting sidelink control information indicating no sidelink data, which includes triggering channel state information feedback and monitoring for responses, using hybrid automatic repeat request feedback mechanisms, and optimizing logical channel prioritization to manage radio link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink control information is transmitted without accompanying sidelink data, then channel state information feedback can be triggered and resource management can be optimized, but unnecessary transmissions occur and interference increases
Solution Approach 1:
The patent applies feedback by transmitting sidelink control information that explicitly triggers channel state information feedback responses from receiving devices. This allows the transmitting device to obtain channel quality information without sending actual data, enabling optimized resource allocation and power control decisions based on the feedback received, thereby improving resource utilization efficiency without causing unnecessary data transmissions
Solution Approach 2:
The patent extracts the channel state information feedback triggering function from the sidelink data transmission protocol, allowing control information to be sent independently without accompanying data. This separation enables the system to obtain channel feedback when needed without performing full data transmissions, thus reducing unnecessary transmissions and associated interference while maintaining the ability to manage resources effectively
2Reliability
If hybrid automatic repeat request feedback mechanisms are implemented, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal feedback mechanism where the same sidelink control information structure serves multiple purposes: it can trigger channel state information feedback, carry hybrid automatic repeat request acknowledgments, and support both acknowledged and unacknowledged transmission modes. This multi-functionality allows the system to achieve reliable transmission through hybrid ARQ while avoiding the need for separate dedicated feedback channels or protocols, thereby limiting the increase in system complexity
3Loss of information
If sidelink control information triggers channel state information feedback responses, then channel quality information is obtained for better resource allocation, but additional signaling overhead is introduced
Solution Approach 1:
The patent merges the channel state information feedback trigger function with the existing sidelink control information structure. By combining multiple functions (resource allocation requests, channel state triggering, and hybrid ARQ feedback) into a single control message format, the system obtains necessary channel quality information without requiring separate dedicated feedback signaling, thereby reducing the additional signaling overhead that would result from separate feedback mechanisms
Data Source
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AI summary
Apparatuses, methods, and systems are disclosed for transmitting sidelink control information indicating no sidelink data. One method (400) includes determining (402), at a user equipment, that there is no sidelink data available for a destination. The method (400) includes transmitting (404) sidelink control information to the destination that indicates that there is no sidelink data available for the destination and triggers a channel state information feedback response from the destination. The method (400) includes monitoring (406) for reception of the channel state information feedback response from the destination.