Adaptive Subcarrier Spacing Selection From Channel Conditions
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Solution Overview
Problem
In certain wireless communications networks, the subcarrier spacing may not be optimal due to a lack of necessary information for selecting the best spacing, leading to suboptimal communication performance.
Innovation Solution
Devices and methods for estimating and indicating a subcarrier spacing value by calculating parameters such as Doppler spread, average delay, delay spread, phase noise power, and inter-carrier interference level, allowing for dynamic adjustment of subcarrier spacing based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed subcarrier spacing is used in wireless communications, then the system configuration is simple, but the communication performance is suboptimal under varying channel conditions
Solution Approach 1:
The patent implements dynamic subcarrier spacing selection where the UE estimates channel parameters (Doppler spread, delay spread, phase noise power, ICI level) and determines an optimal subcarrier spacing value based on these estimates. The network device receives this indication and configures the subcarrier spacing accordingly, allowing the system to adapt to varying channel conditions rather than using a fixed spacing.
Solution Approach 2:
The patent changes the subcarrier spacing parameter based on estimated channel conditions. The UE calculates multiple channel parameters and uses them to determine the most appropriate subcarrier spacing value, then indicates this value to the network device which applies it for transmission and reception, thereby optimizing communication performance for the current channel state.
2Ease of operation
If the network device selects subcarrier spacing without channel information, then the system operation is simple, but the subcarrier spacing selection is not optimal
Solution Approach 1:
The patent introduces a feedback mechanism where the UE estimates channel parameters and determines an optimal subcarrier spacing value, then sends an indication of this value to the network device. The network device uses this feedback to configure the appropriate subcarrier spacing for transmission and reception, ensuring optimal selection based on actual channel conditions rather than arbitrary or fixed choices.
3Reliability
If adaptive subcarrier spacing is implemented, then communication performance is enhanced, but the device complexity increases due to additional calculations
Solution Approach 1:
The patent implements self-service at the UE side where the device autonomously estimates channel parameters (Doppler spread, delay spread, phase noise power, inter-carrier interference level) and determines the optimal subcarrier spacing value without requiring complex network-side calculations. The UE then indicates this determined value to the network device, which simply configures and uses it, thereby distributing the computational burden to the UE and keeping the overall system complexity manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances communication performance by enabling adaptive subcarrier spacing selection, improving signal quality and efficiency in varying channel conditions.
Implementation Method 1
estimating the at least one subcarrier spacing value by calculating a Doppler spread, an average delay, a delay spread, a phase noise power, an inter carrier interference level
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for indicating a subcarrier spacing value. One method includes receiving a configuration from a network device for a report including an indication of at least one subcarrier spacing value for transmitting a physical channel, receiving the physical channel, or a combination thereof. The method includes, in response to receiving the configuration, estimating the at least one subcarrier spacing value by calculating a Doppler spread, an average delay, a delay spread, a phase noise power, an inter carrier interference level, or some combination thereof. The method includes transmitting the report including the indication of the at least one subcarrier spacing value.