Sidelink Superposition Transmission for Concurrent Broadcast and Unicast
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Solution Overview
Problem
Existing sidelink communication technologies in wireless networks do not efficiently utilize resources for concurrent transmissions to multiple user equipment (UEs), leading to inefficiencies in spectral efficiency, reliability, and latency.
Innovation Solution
Implementing multiuser superposition transmission (MUST) techniques that allow a transmitting UE to concurrently transmit a base layer and an enhancement layer using the same set of sidelink resources, with the base layer supporting broadcast or groupcast to multiple UEs and the enhancement layer supporting unicast to a single UE, indicated through sidelink control information (SCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sidelink communication methods are used for concurrent transmissions, then device compatibility is maintained, but spectral efficiency is insufficient
Solution Approach 1:
The transmission is segmented into base layer and enhancement layer, where base layer provides universal compatibility for all UEs while enhancement layer provides additional efficiency for capable UEs. This segmentation allows incremental adoption without requiring all devices to support the full MUST complexity.
Solution Approach 2:
The patent adds a new dimension to sidelink communication by introducing enhancement layer transmissions that operate alongside traditional base layer transmissions. This dimensional expansion allows concurrent transmissions to coexist, improving spectral efficiency while maintaining backward compatibility with legacy devices.
2Productivity
If multiple transmissions are sent concurrently using same resources, then resource utilization improves, but interference between transmissions increases
Solution Approach 1:
The enhancement layer transmission uses partial resources (specific resource elements) within the same time-frequency allocation as the base layer. This partial action approach allows concurrent transmissions to share resources without completely overlapping, reducing interference while improving resource utilization.
Solution Approach 2:
Different transmission layers are assigned different local qualities in terms of modulation and coding schemes. The base layer uses more robust parameters for universal coverage, while the enhancement layer uses higher-order modulation for efficient data transmission to capable UEs, thereby managing interference through localized parameter optimization.
3Reliability
If superposition coding is implemented for concurrent transmissions, then transmission reliability improves, but decoding complexity increases
Solution Approach 1:
The base layer transmission is decoded first as a preliminary step before attempting enhancement layer decoding. This preliminary action reduces the complexity burden by separating the decoding process into stages, where successful base layer decoding provides a foundation for optional enhancement layer processing.
Solution Approach 2:
The decoding mechanism is designed to be universal, supporting both traditional single-layer decoding and multi-layer MUST decoding. Devices can function in multiple modes depending on their capabilities and channel conditions, making the decoding complexity adaptive rather than fixed, thereby improving reliability without universally increasing device complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which multiuser superposition transmission (MUST) is used to provide multiple concurrent sidelink transmissions using a same set of time and frequency resources. A transmitting user equipment (UE) may provide an indication of concurrent MUST transmissions in sidelink control information (SCI), and a receiving UE may decode one or both of a MUST base layer communication and a MUST enhancement layer communication. The base layer communication may include broadcast or groupcast transmissions to multiple UEs, and the enhancement layer communication may include a unicast transmission between the transmitting UE and a single receiving UE. The indication of concurrent transmissions may be provided in a first stage SCI, and parameters for decoding the base layer and enhancement layer transmissions may be provided in one or multiple second stage SCI transmissions.