Sidelink Cyclic Prefix Extension Positioning for Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring cyclic prefix extension (CPE) starting positions for sidelink transmissions, which can impact communication efficiency and interference management.
Innovation Solution
A configuration mechanism is introduced where network nodes and user equipment (UE) can exchange configurations for CPE starting positions, allowing UEs to transmit sidelink transmissions using selected CPE starting positions based on received configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed CPE starting position is used for all sidelink transmissions, then device complexity is reduced and ease of operation is improved, but communication efficiency deteriorates and interference management becomes suboptimal
Solution Approach 1:
The patent implements dynamic CPE starting position selection where the CPE starting position is no longer fixed but varies based on transmission conditions. The network node configures multiple CPE starting positions and the UE selects appropriate positions based on sidelink transmission requirements, channel conditions, and interference scenarios. This dynamic adaptation resolves the contradiction by allowing the system to optimize communication efficiency when needed while maintaining manageable complexity through pre-configured options and automated selection.
Solution Approach 2:
The patent changes the parameter of CPE starting position from a fixed value to a configurable set of values. The network node provides configuration information indicating multiple possible CPE starting positions, and the UE adjusts the selected position based on transmission parameters such as subcarrier spacing, cyclic prefix length, and resource allocation. This parameter flexibility enables optimization of communication efficiency without requiring complex real-time calculations, as the selection is based on pre-defined configurations and straightforward selection criteria.
2Adaptability or versatility
If multiple CPE starting positions are configured for different transmission scenarios, then adaptability and interference management are improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent applies preliminary action by having the network node pre-configure multiple CPE starting positions and associated parameters before sidelink transmissions occur. The configuration information includes multiple possible CPE starting positions, subcarrier spacing values, and cyclic prefix lengths that are prepared in advance. When a sidelink transmission is needed, the UE simply selects from these pre-configured options based on current conditions, rather than calculating optimal parameters in real-time. This resolves the contradiction by providing high adaptability through multiple pre-prepared configurations while keeping device complexity low through automated selection from predefined sets.
Solution Approach 2:
The patent implements self-service by enabling the UE to autonomously select appropriate CPE starting positions from the configured set based on transmission requirements and channel conditions. The UE performs self-adjustment of CPE parameters without requiring continuous network control or complex coordination. This self-service capability provides adaptability to different transmission scenarios while reducing configuration management complexity, as the UE independently makes selection decisions based on pre-configured options and local conditions.
3Productivity
If CPE starting positions are optimized for specific transmission conditions, then communication efficiency and interference reduction are improved, but ease of operation and implementation simplicity deteriorate
Solution Approach 1:
The patent optimizes CPE starting positions by introducing configurable parameters including multiple CPE starting position values, subcarrier spacing variations, and cyclic prefix length adjustments. The network node configures these parameters and the UE selects appropriate combinations based on transmission conditions such as Doppler spread, delay spread, and interference levels. This parameter flexibility achieves optimized transmission efficiency for different conditions while maintaining ease of operation through automated selection and pre-configured parameter sets that eliminate manual optimization requirements.
Solution Approach 2:
The patent incorporates feedback mechanisms where the UE monitors transmission conditions and selects CPE starting positions accordingly. The system uses implicit feedback through successful transmissions and explicit feedback through channel quality indicators to adjust CPE parameter selections. This feedback-driven approach optimizes transmission efficiency by adapting to actual channel conditions while maintaining ease of operation, as the automated feedback loop handles the complexity of condition-based optimization without requiring manual intervention or complex user operations.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, a configuration that indicates one or more cyclic prefix extension (CPE) starting positions. The UE may transmit a sidelink transmission using a selected CPE starting position, of the one or more CPE starting positions, based at least in part on the configuration received from the network node. Numerous other aspects are described.