Sequence-Based Uplink Cancellation Signaling in New Radio
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Solution Overview
Problem
New radio (NR) systems face challenges in efficiently managing uplink transmissions with diverse reliability and latency requirements, necessitating effective multiplexing techniques to avoid adverse impacts on shared resources and prioritize urgent transmissions.
Innovation Solution
The implementation of sequence-based control signaling for uplink transmission cancellation or postponement, using UE-specific sequences multiplexed over common time-frequency resources, allows for efficient resource management by conveying cancellation indications without the need for cyclical redundancy check (CRC) in downlink control information, enabling simpler detection and reduced complexity in receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequence-based control signaling is used for uplink transmission cancellation, then receiver complexity is reduced and detection is simplified, but the ability to provide reliable cancellation indications across diverse transmission types is compromised
Solution Approach 1:
The patent segments the cancellation indication mechanism into two parts: (1) a simplified sequence-based detection mechanism that reduces receiver complexity, and (2) a configuration-based reliability enhancement that ensures accurate interpretation of cancellation indications across different transmission types. The sequence detection is separated from the interpretation logic, allowing each to be optimized independently.
Solution Approach 2:
The patent introduces configuration information as an intermediary between the sequence detection and the cancellation execution. This configuration information acts as a mediator that provides the necessary context (transmission type, time-frequency resources) to interpret the simplified sequence-based indication reliably, without adding complexity to the detection mechanism itself.
2Productivity
If UE-specific sequences are multiplexed over common time-frequency resources, then resource allocation efficiency is improved, but interference management becomes more challenging
Solution Approach 1:
The patent applies local quality by assigning different sequence characteristics (cyclic shifts, orthogonal covers) to different UEs or different cancellation indication types within the same common time-frequency resources. This allows each UE or indication type to have locally optimized sequence properties that minimize interference while maintaining efficient resource utilization.
Solution Approach 2:
The patent changes sequence parameters (cyclic shift values, orthogonal cover indices) dynamically based on UE identity, transmission type, and resource allocation. By adjusting these parameters, the system maintains orthogonal or near-orthogonal sequences across different UEs sharing common resources, thereby reducing interference while preserving resource allocation efficiency.
Data Source
AI summary
Methods, systems, and storage media are described for the cancellation of uplink (UL) transmissions for new radio (NR). Other embodiments may be described and/or claimed.