Pre-generating Waveform Components for Per Subband LBT
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Solution Overview
Problem
Conventional techniques for wireless communications in unlicensed or shared radio frequency spectrum bands are inadequate due to the requirement for a listen before talk (LBT) procedure, leading to inefficiencies in channel access and resource allocation, especially when devices lack the capability to prepare and combine multiple waveform components within the constraints of memory and signal processing hardware.
Innovation Solution
A transmitting device pre-generates waveform components based on its capability, prioritizing subbands over guard bands, and combines them post-LBT procedure, allowing for efficient transmission in a first time interval, with guard bands included in subsequent intervals, and employs resource block group configurations to account for guard bands in resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If waveform components are pre-generated for all subbands before LBT procedure, then channel access latency is reduced, but device memory and signal processing hardware requirements increase
Solution Approach 1:
The patent divides the frequency spectrum into multiple subbands and generates waveform components for each subband separately. This segmentation allows the device to pre-generate waveform components for multiple subbands independently, reducing channel access latency while managing memory and processing requirements through structured organization of waveform components across different frequency segments.
Solution Approach 2:
The patent performs waveform component generation in advance before the LBT procedure completes. By pre-generating waveform components for multiple subbands prior to channel access determination, the system eliminates the need to generate waveforms after LBT succeeds, thereby reducing channel access latency. The device stores these pre-generated components and combines them based on LBT results.
2Productivity
If multiple waveform components are pre-generated and combined after LBT, then system throughput is improved, but device complexity increases
Solution Approach 1:
The patent segments the overall waveform into multiple waveform components corresponding to different subbands. Each component can be generated, stored, and combined independently. This segmentation enables efficient throughput by allowing parallel processing and combination of components based on which subbands successfully passed LBT, while managing device complexity through modular component structure.
Solution Approach 2:
The patent implements dynamic waveform combination where the final transmitted waveform is constructed by selectively combining pre-generated waveform components based on LBT results. The combination process adapts to channel conditions by including only those subband components that successfully passed LBT, optimizing system throughput while managing processing complexity through conditional combination logic.
3Reliability
If waveform components for guard bands are included, then transmission reliability is improved, but waveform generation time increases
Solution Approach 1:
The patent applies different quality requirements to different parts of the spectrum. Subbands receive full waveform component generation with all processing steps to ensure reliable transmission, while guard bands receive simplified or omitted waveform generation. This local quality differentiation maintains transmission reliability for data-carrying subbands while reducing overall waveform generation time by minimizing processing in guard band regions.
Solution Approach 2:
The patent implements partial waveform generation where waveform components are generated for subbands that are likely to be transmitted, while guard band components are either partially generated or omitted entirely. This partial action approach maintains sufficient transmission reliability for the essential data-carrying subbands while reducing total waveform generation time by applying less processing to guard band regions.
Data Source
AI summary
A transmitting device (e.g., a base station, a user equipment (UE)) may pre-generate waveform components, for a transmission to be sent subsequent to a listen before talk (LBT) procedure, based on a waveform generation capability of the transmitting device (e.g., based on their memory storage capability, their ability to combine waveform components in the time domain following a per subband LBT procedure, etc.). Further, certain behavior or rules (e.g., which waveform components are generated, how many subbands are included in a waveform component, etc.) may be expected by both a base station and a UE depending on the waveform generation capability of the transmitting device and the resource allocation. Additionally, resource block group (RBG) configurations (e.g., RBG definitions) for improved resource allocation are also described. A bases station may indicate one or more guard band boundaries to a UE to indicate such RBG configurations that account for guard bands.