Sidelink Message Retransmission to Improve UE Reception Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in reliably transmitting common and private messages using rate splitting MIMO, leading to decoding failures and increased resource consumption due to retransmissions, which can increase access link overhead and energy consumption.
Innovation Solution
Implementing sidelink retransmission of messages, where a second UE receives a retransmission indication from a network node and transmits the message to a first UE, enhancing message reception reliability without increasing access link overhead or energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node performs retransmissions of messages to the first UE, then message reliability is improved, but access link time and energy resources are consumed
Solution Approach 1:
The patent introduces a second UE as an intermediary to perform sidelink retransmissions of messages to the first UE. This mediator approach allows the network node to offload retransmission tasks, improving message reliability through additional transmission opportunities while avoiding the consumption of access link time and energy resources by the network node itself.
2Reliability
If the network node performs retransmissions of messages to the first UE, then message reliability is improved, but energy consumption at the network node increases
Solution Approach 1:
The second UE acts as a mediator that assumes the retransmission burden from the network node. The network node sends messages to the second UE, which then performs sidelink retransmissions to the first UE. This distributes the energy consumption from the network node to the second UE, maintaining message reliability while reducing the network node's energy usage.
Solution Approach 2:
The second UE autonomously performs the retransmission function without requiring network node intervention. Upon receiving a message from the network node, the second UE independently decides and executes the retransmission to the first UE, making the system self-sufficient and reducing the network node's operational burden.
3Reliability
If the network node performs retransmissions of messages to the first UE, then message reliability is improved, but access link overhead increases
Solution Approach 1:
The second UE serves as an intermediary that handles retransmissions over the sidelink, separating the initial access link transmission from subsequent retransmission operations. The network node sends the message once to the second UE via the access link, and all subsequent retransmissions occur over the sidelink, preventing access link overhead from increasing while maintaining message reliability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a second user equipment (UE) may receive, from a network node, at least one message, the at least one message comprising at least one of a first common message directed to a first UE or a first private message directed to the first UE. The second UE may decode the at least one message. The second UE may receive, from the network node, a retransmission indication instructing the second UE to transmit, to the first UE, at least one retransmission of the at least one message. The second UE may transmit, to the first UE, the retransmission of the at least one message. Numerous other aspects are described.