High-Frequency Control Channel Scheduling With Adaptive SCS and CP
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Solution Overview
Problem
Existing wireless communication technologies face challenges in addressing increased phase noise at higher frequencies, which affects signal quality and efficiency.
Innovation Solution
Implementing enhanced control channel and shared channel transmissions using dynamic subcarrier spacing (SCS) and cyclic prefix (CP) adjustments, along with multi-level control-information monitoring and acknowledgement mechanisms, to optimize signal processing at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher frequencies are used for wireless communication, then bandwidth and data rate are improved, but phase noise increases causing transmission reliability degradation
Solution Approach 1:
The patent implements dynamic selection of subcarrier spacing and cyclic prefix lengths based on channel conditions and frequency bands. At higher frequencies, the system dynamically adjusts to larger subcarrier spacing to mitigate phase noise effects, while maintaining appropriate CP lengths to handle inter-symbol interference, thus preserving transmission reliability while utilizing high-frequency bandwidth
Solution Approach 2:
The patent changes key OFDM parameters (subcarrier spacing and cyclic prefix length) based on operating frequency. At higher frequencies, larger subcarrier spacing is applied to reduce phase noise impact on orthogonality, and CP lengths are adjusted to account for reduced delay spread, thereby maintaining reliable communication while enabling high data rates
2Reliability
If larger subcarrier spacing is used to mitigate phase noise, then transmission reliability is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent applies different subcarrier spacing values to different frequency bands and channel conditions rather than using a uniform spacing. In high-frequency bands where phase noise is severe, larger spacing is used to ensure reliability, while in lower bands with better phase noise characteristics, smaller spacing is used to maximize spectral efficiency, thus optimizing the trade-off locally for each operating condition
3Productivity
If shorter cyclic prefix is used to increase data rate, then spectral efficiency is improved, but inter-symbol interference increases at high frequencies
Solution Approach 1:
The patent dynamically adjusts cyclic prefix length based on the operating frequency and channel characteristics. At higher frequencies where delay spread is reduced, the system can use shorter CP lengths to improve spectral efficiency while still preventing inter-symbol interference, as the naturally reduced multipath effects at high frequencies provide inherent protection against ISI
Data Source
AI summary
Methods, apparatuses and systems directed to enhanced control channel and shared channel transmissions at high frequencies are provided. Among the methods is a method that may include any of receiving downlink control information indicating a modulation and coding scheme (MCS), a time domain resource assignment, and a frequency domain resource assignment; obtaining a subcarrier spacing (SCS) and a cyclic prefix (CP) length based on the MCS; determining the time and frequency domain resource assignments based on the SCS and the CP length; and receiving a downlink transmission at time and frequency resources associated with the time and frequency domain resource assignments.