Network Coding Resource Grant for Sidelink Retransmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resources for network coding procedures, particularly in sidelink communications, where multiple UEs need to retransmit data efficiently.
Innovation Solution
The described techniques involve a wireless communications device requesting resources from a base station to transmit a network coding message that includes a network coding packet, which is generated based on a set of transport blocks. This allows for efficient retransmission of multiple packets in a single network coding message, reducing the need for individual retransmissions from each UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UEs perform separate retransmissions to retransmit a set of transport blocks, then each UE can reliably receive the data, but the resource utilization efficiency deteriorates and retransmission overhead increases
Solution Approach 1:
The patent combines multiple separate retransmission operations into a single network coding retransmission. Instead of having each UE transmit separate retransmission packets, the network coding device aggregates multiple transport blocks and encodes them into a single network coding packet that can be transmitted once and decoded by multiple UEs, thereby improving resource utilization while maintaining reliability
Solution Approach 2:
The network coding packet serves multiple functions simultaneously - it acts as a retransmission packet for multiple different UEs at the same time. The single network coding packet can be received and decoded by multiple UEs to recover their respective lost data, making the retransmission mechanism universal rather than individual-specific
2Reliability
If multiple UEs perform separate retransmissions, then each UE receives appropriate data, but the retransmission overhead and time consumption increase
Solution Approach 1:
The patent merges multiple retransmission time slots into a single time slot by using network coding. Multiple transport blocks are encoded together into one network coding packet that is transmitted once, eliminating the need for multiple separate retransmission cycles and significantly reducing time consumption while maintaining data delivery assurance for all UEs
3Adaptability or versatility
If the base station grants resources for traditional retransmissions, then individual UE retransmissions are supported, but the system cannot efficiently handle network coding-based retransmissions
Solution Approach 1:
The patent applies preliminary action by having the network coding device prepare and encode multiple transport blocks into a network coding packet before transmission. The device performs the encoding operation in advance, combining multiple data units into a single structured packet that can then be efficiently transmitted and decoded by multiple UEs, simplifying the overall system complexity
Solution Approach 2:
The network coding device acts as an intermediary between the source UEs and the destination UEs. It receives transport blocks from source UEs, performs network coding operations, and generates network coding packets that are then transmitted to multiple destination UEs, thereby simplifying the resource grant mechanism while maintaining system adaptability
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless communications device, such as a roadside unit (RSU) or a user equipment (UE), may transmit a network coding packet on a sidelink to perform an efficient retransmission for multiple packets. In some systems, a base station may coordinate sidelink communications between devices, such as by granting resources for the devices to communicate on the sidelink. The device which transmits the network coding packet may request resources from the base station, and the base station may grant resources for the device to transmit the network coding packet. These techniques may be implemented to prevent the base station from granting resources to the original source UEs for retransmission.