TD-OCC Frequency Hopping for Non-Consecutive DMRS Symbols
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies face challenges in supporting a larger number of Demodulation Reference Signal (DMRS) ports and improving channel demodulation performance, especially in scenarios with varying channel conditions due to frequency impairments.
Innovation Solution
Implementing Time Domain Orthogonal Cover Coding (TD-OCC) on non-consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols with frequency hopping, allowing for additional DMRS ports and enhancing demodulation by applying TD-OCC selectively based on DMRS characteristics across multiple frequency-domain hops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TD-OCC is applied on non-consecutive OFDM symbols with frequency hopping, then the number of supported DMRS ports increases and channel demodulation performance improves, but the system complexity and configuration difficulty increase
Solution Approach 1:
The patent segments the frequency domain into multiple hops and applies TD-OCC selectively within each hop based on channel conditions. This allows the system to support more DMRS ports by dividing the frequency resource into manageable segments, where each segment can independently apply orthogonal cover coding on non-consecutive symbols without overwhelming system complexity.
Solution Approach 2:
The patent introduces dynamic configuration of TD-OCC parameters including hop-specific enabling/disabling, variable OCC lengths (1 or 2 symbols), and flexible symbol selection. This dynamic approach allows the system to adapt the complexity level to current channel conditions, supporting more DMRS ports when needed while reducing complexity when channel conditions are stable.
2Reliability
If TD-OCC is selectively applied based on DMRS characteristics across multiple frequency-domain hops, then channel demodulation performance improves under varying channel conditions, but the configuration and control complexity increases
Solution Approach 1:
The patent applies different TD-OCC configurations to different frequency hops based on local channel characteristics. Each hop can have independent TD-OCC enabling/disabling, OCC length selection, and symbol position configuration. This local optimization allows improved demodulation performance in challenging frequency regions while maintaining simpler configurations in stable regions.
Solution Approach 2:
The patent changes multiple parameters to achieve selective TD-OCC application: hop-specific enabling/disabling flags, variable OCC lengths (1 or 2 symbols), different symbol position offsets, and port-specific configurations. These parameter changes enable adaptive optimization of demodulation performance across varying channel conditions while providing flexible control mechanisms.
3Productivity
If additional DMRS ports are supported through TD-OCC on non-continuous symbols, then spectral efficiency and communication capacity improve, but the processing complexity and computational load increase
Solution Approach 1:
The patent applies TD-OCC partially rather than universally across all frequency hops and all DMRS ports. By selectively enabling TD-OCC only where needed (certain hops, certain ports, specific symbol positions), the system achieves improved communication capacity through additional ports while avoiding the full processing complexity of universal TD-OCC application.
Data Source
AI summary
Methods, apparatus, and systems that enable Time Domain (TD) Orthogonal Cover Coding (OCC) on non-consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols with frequency hopping are disclosed. In one example aspect, a method for wireless communication includes configuring, by a base station, multiple frequency-domain hops for a communication from a terminal device and receiving, by the base station, the communication from the terminal device. TD-OCC is selectively applied, based on a characteristic of a Demodulation Reference Signal (DMRS), to one or more non-continuous symbols that carry the DMRS in at least one of the multiple frequency-domain hops.