Distributed Short Training Field Transmission for dRU Power Control
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Solution Overview
Problem
Existing wireless communication systems inefficiently utilize transmit power in resource units due to suboptimal allocation of data and pilot tones, leading to reduced power in RU communications and potential interference.
Innovation Solution
Implementing distributed resource unit (dRU) transmission mode with a spatial stream global cyclic shift delay (CSD) index and tone plan to transmit the short training field (STF) across a dRU spreading bandwidth, ensuring increased transmission power and avoiding collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If distributed resource unit (dRU) transmission mode is implemented with spatial stream global CSD index and tone plan, then STF transmission power is increased and collisions are avoided, but device complexity increases due to additional configuration parameters
Solution Approach 1:
The patent applies parameter changes by introducing a spatial stream global CSD index parameter and configuring tone plans with specific spacing patterns. These parameter changes enable the STF to be transmitted with increased power across distributed subcarriers while maintaining orthogonality through cyclic shift delay, resolving the contradiction between power enhancement and complexity by optimizing the configuration parameters rather than fundamentally changing the transmission architecture
Solution Approach 2:
The patent segments the STF transmission across multiple distributed subcarriers within the dRU bandwidth rather than concentrating power on a single resource unit. By distributing the training field across segmented frequency resources with appropriate spacing, the system achieves higher overall transmission power while avoiding collisions through the segmented structure, balancing power improvement with manageable complexity
2Device complexity
If regular resource unit (rRU) configuration is used for STF transmission, then device complexity is reduced, but transmission power is insufficient and collisions may occur
Solution Approach 1:
The patent transitions from the traditional single-resource-unit dimension to a distributed multi-subcarrier dimension for STF transmission. By spreading the STF across multiple subcarriers in the frequency domain with specific spacing patterns defined by the tone plan, the system achieves higher effective transmission power while maintaining manageable complexity through the structured dimensional expansion
Data Source
AI summary
This disclosure provides methods, devices and systems for distributed transmission of short training fields in a power spectral density limited frequency band. In one aspect, a device receives a distributed resource unit (dRU) assignment for transmission of a dRU portion of a physical layer protocol data unit (PPDU); determines a spatial stream global cyclic shift delay (CSD) index for an short training field (STF) of the dRU portion of the PPDU; and transmits, based on the spatial stream global CSD index, the EHT of the dRU portion of the PPDU across a dRU spreading bandwidth associated with the dRU assignment using a tone plan and sequence corresponding to a regular resource unit (rRU) transmission mode.