Sidelink HARQ Channel Selection for Efficient UE Retransmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing sidelink retransmissions effectively, particularly in scenarios where data is improperly received, leading to inefficiencies in direct UE-to-UE communication.
Innovation Solution
A method and apparatus for sidelink retransmission in wireless communication systems, involving the use of hybrid automatic repeat request (HARQ) feedback to select and transmit data units over configured logical channels, optimizing sidelink transmission with similar quality of service characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink retransmission is performed without selective logical channel configuration, then transmission coverage is maintained, but transmission efficiency deteriorates due to improper retransmission of data units
Solution Approach 1:
The patent segments the logical channel configuration by introducing a specific field in the RRCReconfiguration message that separately configures HARQ feedback for different logical channels. This allows the network to selectively enable HARQ feedback only for specific logical channels (e.g., high-priority control channels) while leaving other channels without HARQ feedback, thereby improving transmission efficiency for retransmissions without compromising reliability for critical channels.
Solution Approach 2:
The patent applies local quality by differentiating HARQ feedback configuration across different logical channels based on their specific requirements. Each logical channel can have its own HARQ feedback configuration (enabled or disabled), allowing the system to optimize for reliability where needed and for efficiency where appropriate, rather than applying a uniform configuration across all channels.
2Reliability
If HARQ feedback is configured for all logical channels, then transmission reliability is improved, but system complexity increases due to additional configuration and management overhead
Solution Approach 1:
The patent extracts the HARQ feedback configuration from a global setting and makes it channel-specific by introducing dedicated fields in the RRCReconfiguration message. This allows the network to selectively apply HARQ feedback only where necessary, reducing the overall configuration complexity and management overhead while maintaining reliability for critical channels.
Solution Approach 2:
The patent introduces dynamic configurability where the HARQ feedback setting for each logical channel can be independently adjusted by the network based on current service requirements. This dynamic approach allows the system to adapt to changing conditions, enabling HARQ feedback when reliability is critical and disabling it when efficiency is prioritized, thereby reducing unnecessary complexity.
3Productivity
If retransmission resources are allocated without logical channel selection, then resource availability is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring which logical channels should have HARQ feedback enabled before retransmission occurs. This allows the network to prepare and allocate retransmission resources more efficiently, knowing in advance which channels require retransmission support, thereby improving resource utilization without reducing the quantity of available resources.
Data Source
AI summary
The present disclosure relates to sidelink retransmission in wireless communications. According to an embodiment of the present disclosure, a method performed by a first wireless device in a wireless communication system comprises: receiving, from a network, sidelink (SL) resources configured with a hybrid automatic repeat request (HARQ) feedback; selecting one or more logical channels only configured with the HARQ feedback; generating a data unit based on the one or more logical channels only configured with the HARQ feedback; and transmitting, to a second wireless device, the data unit based on the SL resources.