Unlicensed-Band Sidelink Feedback Allocation by Traffic and Cast Type
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Solution Overview
Problem
Current 5G and NR networks lack a specified sidelink feedback resource allocation mechanism on unlicensed bands, which is essential for efficient data transmission and reception in V2X communication.
Innovation Solution
The proposed solution involves defining multiple feedback resource patterns for sidelink transmissions on unlicensed bands, which are configured by a network node and determined by user equipment (UE) based on traffic type and cast type of the transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple feedback resource patterns are defined for different traffic types and cast types, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The feedback resource allocation mechanism is segmented into multiple distinct patterns (Pattern 1, Pattern 2, Pattern 3), each optimized for specific traffic types and cast types. The network configures these patterns separately, and the UE selects the appropriate pattern based on the transmission characteristics, thereby achieving adaptability without requiring a single complex allocation mechanism to handle all scenarios.
Solution Approach 2:
The feedback resource pattern is made dynamic through configuration by the network node, which can enable or disable specific patterns based on traffic conditions. The UE dynamically selects and switches between different feedback resource patterns according to the current transmission type (broadcast, unicast, groupcast) and traffic characteristics, allowing the system to adapt to changing conditions while maintaining manageable complexity through standardized selection rules.
2Reliability
If feedback resource patterns are configured by network node, then reliability is improved, but device complexity increases
Solution Approach 1:
The network node performs preliminary configuration of feedback resource patterns before actual data transmission occurs. By pre-defining multiple patterns with specific characteristics and enabling/disabling them based on expected traffic types, the network ensures reliable feedback allocation is in place beforehand, eliminating the need for complex real-time negotiations and reducing runtime complexity for the UE.
Data Source
AI summary
Embodiments of the present application relate to methods and apparatuses for a sidelink feedback resource allocation mechanism on an unlicensed band. According to an embodiment of the present application, a user equipment (UE) includes a transceiver; and a processor coupled to the transceiver, wherein the processor is configured: to receive configuration information for a sidelink transmission on an unlicensed band via the transceiver from a network; to determine a feedback resource pattern on a feedback slot in response to a data transmission based on the configuration information; and to determine a set of feedback resources on the feedback slot based on the feedback resource pattern.