Sidelink Assistance Signaling for PSFCH and HARQ Reliability
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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 issues such as simultaneous transmission and reception conflicts and power control limitations.
Innovation Solution
A terminal device transmits assistance information to other devices under specific conditions to facilitate resource selection and parameter adjustments for improved sidelink transmission, including resource set indications, DMRS patterns, and HARQ feedback types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If half-duplex mode is used for sidelink communication, then power consumption is reduced and hardware complexity is lowered, but transmission reliability deteriorates due to inability to simultaneously transmit and receive
Solution Approach 1:
The system dynamically switches between half-duplex and full-duplex modes based on communication requirements. The terminal device can adaptively adjust its operational mode to balance between power consumption/hardware complexity and transmission reliability, allowing simultaneous transmission and reception when needed while maintaining simpler operation during normal conditions.
2Reliability
If multiple PSFCHs are transmitted simultaneously by RX UE, then feedback reliability is improved, but power control limitations and UE capability constraints cause transmission failures
Solution Approach 1:
The system performs preliminary power control adjustments and resource allocation before simultaneous PSFCH transmissions. The network device or terminal devices pre-calculate power levels and select appropriate time-frequency resources to ensure that multiple feedback transmissions can occur without exceeding UE capability limits, thereby maintaining feedback reliability while respecting hardware constraints.
Solution Approach 2:
The system dynamically adjusts power control parameters and transmission timing based on channel conditions and UE capabilities. When simultaneous PSFCH transmissions are required, the system adaptively modifies power levels and resource allocation to match actual UE capabilities, ensuring reliable feedback transmission without causing interference or exceeding hardware limits.
3Ease of operation
If PSFCH resources are allocated without coordination, then resource allocation simplicity is maintained, but resource conflicts occur when multiple PSSCH transmissions map to the same PSFCH occasion
Solution Approach 1:
The system implements feedback mechanisms where terminal devices report channel conditions, interference levels, and resource usage status to the network device. Based on this feedback, the network device dynamically adjusts PSFCH resource allocation to prevent conflicts while maintaining reasonable allocation simplicity. The feedback loop enables coordinated resource management without requiring complex centralized control.
Solution Approach 2:
The system performs preliminary resource coordination and conflict detection before allocating PSFCH resources. The network device or terminal devices pre-identify potential resource conflicts and adjust allocations in advance, ensuring that multiple PSSCH transmissions do not map to the same PSFCH occasion. This preliminary action prevents resource conflicts while maintaining relatively simple allocation procedures.
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.