Extended Range PPDU Repetition for 5 GHz Propagation Loss
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Solution Overview
Problem
Current wireless communication technologies, such as IEEE 802.11ax and IEEE 802.11be, face limitations in range extension due to higher propagation losses in 5 GHz and 6 GHz bands, and are not compatible with practical usage, especially for high-data rate communications, while legacy standards like IEEE 802.11b are limited to low-data rate direct sequence spread spectrum communication.
Innovation Solution
The implementation of an extended range (ER) physical layer protocol data unit (PPDU) that includes both a legacy portion and an ER portion, with the ER portion being repeated in time and frequency domains to increase signal-to-noise ratio (SNR), allowing next-generation devices to decode and transmit data at extended ranges while maintaining compatibility with legacy devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If extended range PPDU is used in 5 GHz and 6 GHz bands, then communication range is improved, but propagation losses increase
Solution Approach 1:
The patent applies periodic action by repeating the ER portion of the PPDU multiple times in the time domain. Each repetition allows the receiver to accumulate signal energy, effectively combating propagation losses in 5 GHz and 6 GHz bands while extending communication range. The repeated transmissions occur at regular intervals, enabling the receiver to combine multiple copies of the signal to improve SNR.
Solution Approach 2:
The patent merges multiple signal copies by combining repeated ER portions at the receiver side. The receiver collects multiple repetitions of the ER portion and combines them through coherent or non-coherent integration, merging the signal energy from multiple transmissions to overcome propagation losses and extend effective communication range.
2Reliability
If repetition in time and frequency domains is applied, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent segments the PPDU into distinct portions: a legacy portion compatible with existing devices and an ER portion with repeated fields for enhanced reliability. This segmentation allows next-generation devices to utilize the repeated ER portion for improved SNR while legacy devices continue to operate with the standard legacy portion, avoiding the need for complete system redesign.
Solution Approach 2:
The ER portion of the PPDU serves multiple functions: it provides extended range capability, enables improved SNR through repetition, and maintains backward compatibility with legacy devices. The same ER portion structure with repeated fields can be used across different wireless communication scenarios and device types, making the solution universally applicable.
3Productivity
If extended range PPDU is implemented, then ultra-high rate communication is supported, but compatibility with legacy devices is challenged
Solution Approach 1:
The PPDU is segmented into a legacy portion that ensures compatibility with existing devices and an ER portion that enables ultra-high rate communication. Legacy devices can process the legacy portion without issue, while next-generation devices can utilize the ER portion with repeated fields to achieve extended range and higher data rates.
Solution Approach 2:
The ER portion acts as an intermediary layer between legacy and next-generation systems. It contains repeated fields that provide the necessary signal reinforcement for extended range communication while maintaining a structure that doesn't interfere with legacy device operation, serving as a bridge between different generations of wireless technology.
Data Source
AI summary
A method and system for generating an extended range (ER) physical layer protocol data unit (PPDU) is disclosed. The PPDU has a legacy portion of the ER PPDU which comprises one or more of a legacy short training field (L-STF), a legacy long training field (L-LTF), and a universal signaling (U-SIG) field and an ER portion of the ER PPDU which is appended to the legacy portion. The ER portion comprises one or more repetitions of a ER short training field (ER-STF), a ER long training field (ER-LTF), a ER-signal (ER-SIG) field, and a ER data field. In an example, signals indicative of the one or more repetitions for a same field are combined by a receiver to increase a signal to noise ratio of a field.