Dynamic Padding Duration for Wireless Half Subframes
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Solution Overview
Problem
In wireless communication networks, the fixed padding duration at the start of every half subframe leads to significant wasted overhead, especially at higher carrier frequencies, as it exceeds the length of a normal cyclic prefix and can approach or equal a full symbol length, resulting in inefficient resource utilization.
Innovation Solution
A wireless node determines a symbol length based on subcarrier spacing and transmits a single carrier symbol with a shorter duration than the full symbol length in the padding duration, allowing for increased time domain resource utilization and dynamic waveform switching between OFDM and single carrier waveforms, while also adapting transmit power or receive gain to handle power transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed padding duration is used at the start of every half subframe to ensure integer number of symbols fit, then symbol alignment is maintained, but resource utilization efficiency deteriorates due to significant wasted overhead
Solution Approach 1:
The patent makes the padding duration dynamic by adjusting it based on the actual number of symbols that fit within the half subframe duration. Instead of using a fixed padding duration, the system calculates the required padding to make the total symbol duration equal to the half subframe duration, thereby eliminating wasted overhead while maintaining proper symbol alignment.
Solution Approach 2:
The patent changes the padding duration parameter adaptively based on subcarrier spacing and the number of symbols per half subframe. By modifying this parameter dynamically rather than keeping it fixed, the system optimizes resource utilization while ensuring that symbols align properly within the half subframe boundaries.
2Stability of the object's composition
If padding duration exceeds cyclic prefix length at high subcarrier spacings, then symbol fitting is ensured, but overhead waste increases significantly
Solution Approach 1:
The patent implements dynamic adjustment of padding duration that adapts to different subcarrier spacings. At higher subcarrier spacings where the fixed padding would exceed cyclic prefix length, the system calculates the minimal required padding to achieve integer symbol fitting, thereby reducing overhead waste while maintaining symbol structure integrity.
Solution Approach 2:
The patent applies different padding strategies based on local conditions (subcarrier spacing values). For lower subcarrier spacings, the full fixed padding is used, while for higher subcarrier spacings, the padding is reduced to match the actual requirement, optimizing the balance between symbol integrity and overhead efficiency for each specific case.
3Stability of the object's composition
If padding duration approaches full symbol length at very high subcarrier spacings, then symbol alignment is maintained, but effective transmission time is reduced
Solution Approach 1:
The patent dynamically adjusts padding duration to prevent it from approaching full symbol length at very high subcarrier spacings. By calculating the actual number of symbols that fit within the half subframe and adjusting padding accordingly, the system ensures that padding remains a small fraction of the total half subframe duration, thereby maximizing effective transmission time while maintaining half subframe structure integrity.
Solution Approach 2:
The patent changes the padding duration parameter as a function of subcarrier spacing to prevent excessive overhead. At very high subcarrier spacings, the padding is reduced proportionally, ensuring that it does not approach the length of a full symbol, thus preserving productive transmission time while maintaining proper half subframe structure.
Data Source
AI summary
In a wireless network, a frame structure may include a padding duration at the start of every half subframe to ensure that an integer number of symbols fit within a duration of the half subframe. In some aspects, to avoid wasting time domain resources, the padding duration may be utilized for other purposes. For example, because a single carrier waveform is not bound to a fixed Fast Fourier Transform size, a wireless node may use the padding duration to transmit a single carrier symbol that has a shorter length than a full symbol associated with a subcarrier spacing. Additionally, or alternatively, in cases where a wireless node is configured to transmit or receive a signal in a first symbol of a half subframe that is associated with a different power level than a preceding symbol, the padding duration may be used to adapt a transmit power or a receive gain.