Sidelink Assistance Signaling for Half-Duplex Resource Conflicts
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Solution Overview
Problem
The reliability of sidelink transmission in LTE systems is compromised due to half-duplex limitations and UE capability constraints, leading to simultaneous transmitting and receiving challenges and resource conflicts among UEs.
Innovation Solution
A terminal device transmits assistance information to other devices under periodic or trigger conditions to facilitate resource selection and parameter adjustments for improved sidelink transmission reliability, including resource set indications, DMRS patterns, and HARQ feedback types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If half-duplex mode is used for sidelink communication, then power consumption is reduced and hardware complexity is lowered, but simultaneous transmitting and receiving cannot be performed leading to degraded transmission reliability
Solution Approach 1:
The patent applies preliminary action by having the first terminal device send assistance information to the second terminal device before the actual sidelink transmission occurs. This assistance information includes resource set indications and other parameters that the second terminal device needs to properly receive and process the upcoming transmission, thereby ensuring reliable communication even in half-duplex mode where simultaneous transmit and receive are not possible.
2Reliability
If multiple PSFCHs are transmitted simultaneously by RX UE, then feedback for multiple PSSCH transmissions is provided, but UE capability limitations and power control constraints prevent simultaneous transmission leading to resource conflicts
Solution Approach 1:
The patent resolves resource conflicts by applying preliminary action - the first terminal device determines and indicates appropriate resource sets to the second terminal device before the sidelink transmission takes place. This includes indicating time domain resources, frequency domain resources, and other parameters that prevent resource conflicts between multiple transmissions and their corresponding feedback channels, eliminating the need for complex runtime resource conflict management.
3Reliability
If assistance information is transmitted frequently to ensure up-to-date resource allocation, then sidelink transmission reliability is improved, but signaling overhead and network resource consumption increase
Solution Approach 1:
The patent applies periodic action by configuring the first terminal device to send assistance information periodically or based on trigger events rather than continuously. The network device can configure periodic reporting intervals or event-triggered reporting conditions, allowing the assistance information to be updated at appropriate intervals to maintain reliability while minimizing unnecessary signaling overhead during stable communication conditions.
Solution Approach 2:
The patent utilizes parameter changes by allowing the assistance information to include dynamic parameters such as resource set indications, time domain resource configurations, frequency domain resource configurations, and other transmission parameters that can be adjusted based on current channel conditions and traffic requirements, enabling efficient adaptation without frequent complete re-transmissions.
Data Source
AI summary
The present disclosure discloses an information transmission method and a terminal device. The information transmission method includes: transmitting assistance information to at least one second terminal device if a periodic reporting condition or a preset trigger condition is met, where the assistance information is used for the at least one second terminal device to perform sidelink transmission.