Superposition Coded Modulation for Sidelink Control and Data
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in sidelink communications, particularly in spectral efficiency and latency, due to limitations in resource allocation and signaling overhead when using mini-slots for sidelink control and data transmission.
Innovation Solution
The implementation of superposition coded modulation (SCM) for sidelink communications, where a first layer is used for sidelink control information and a second layer for sidelink data, both transmitted using the same resource elements, allowing for concurrent transmission and improved spectral efficiency and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate resource allocation is used for sidelink control information and sidelink data, then resource allocation is simple and reliable, but spectral efficiency is low and latency is high
Solution Approach 1:
The patent merges sidelink control information and sidelink data into a single physical uplink shared channel transmission, allowing both control and data to be transmitted simultaneously over the same resources. This combining approach eliminates the need for separate resource allocation, thereby improving spectral efficiency while maintaining reliable delivery through unified transmission.
Solution Approach 2:
The physical uplink shared channel is designed to serve multiple functions simultaneously - carrying both sidelink control information and sidelink data. This multi-functionality allows the same transmission resources to be utilized for different types of information, resolving the contradiction between simple allocation and efficient resource utilization.
2Reliability
If separate resource allocation is used for sidelink control information and sidelink data, then transmission is reliable, but latency increases
Solution Approach 1:
By combining control information and data into a single transmission, the patent eliminates the sequential transmission requirement. Both types of information are sent simultaneously in one go, which reduces the total transmission time and latency while maintaining reliability through the unified channel protection and acknowledgment mechanisms.
3Device complexity
If separate resource allocation is used for sidelink control information and sidelink data, then resource management is simple, but signaling overhead increases
Solution Approach 1:
The unified physical uplink shared channel serves as a universal transmission medium for both control information and data. This eliminates the need for separate signaling channels and resource allocation messages, reducing signaling overhead while keeping resource management straightforward through a single channel configuration approach.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may encode, for a first set of resource elements (REs), a first layer for sidelink control information. The UE may encode, for a second set of REs, a second layer for sidelink data, wherein the first set of REs and the second set of REs are associated with a same one or more symbols. The UE may transmit, to another UE and based at least in part on applying superposition coded modulation (SCM) to the first layer and the second layer, the sidelink control information using the first set of REs and the sidelink data using the second set of REs. Numerous other aspects are described.