PPDU Duplicate Transmission for Wireless LAN Range Extension
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Solution Overview
Problem
Current wireless LAN systems face limitations in extending signal transmission range, particularly in bands with limited transmission power, such as the 6 GHz band, where maintaining stable and efficient signal transmission is challenging.
Innovation Solution
The proposed solution involves configuring a transmission physical protocol data unit (PPDU) with a duplicate transmission mode, including a first control signal field, a short training field, a long training field, and a data field, where the data field is duplicated in frequency to cover half of the total bandwidth, and the training fields are configured based on predefined sequences, enhancing signal stability and range in bands with limited power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If transmission power is increased to extend signal range, then transmission range is improved, but energy consumption increases and device complexity increases
Solution Approach 1:
The patent applies copying by duplicating the data field across multiple frequency subbands within the transmission PPDU. This creates redundant copies of the data that can be received and decoded even if some frequency portions experience fading or interference, effectively extending reliable transmission range without increasing transmit power
Solution Approach 2:
The patent segments the total bandwidth into multiple subbands and distributes data across these segments. The data field is divided and transmitted in duplicate across different frequency portions, allowing the receiver to combine or select segments to achieve reliable reception over extended ranges with limited power
2Reliability
If transmission power is increased to maintain stable signal transmission, then signal stability is improved, but energy consumption increases
Solution Approach 1:
The patent creates redundant copies of the data field in the frequency domain, ensuring that stable signal transmission can be achieved through diversity combining at the receiver rather than through high transmit power. The duplicate data portions provide reliability without increasing energy consumption
Solution Approach 2:
The patent changes the frequency domain parameters by distributing data across multiple subbands with duplicate transmission. This parameter change in the frequency domain provides signal stability through frequency diversity rather than through power increase
3Productivity
If bandwidth is increased to improve throughput, then data rate is improved, but device complexity increases
Solution Approach 1:
The patent segments the wide bandwidth into multiple subbands and allocates resource units within these subbands. This segmentation approach allows efficient utilization of wide bandwidth for high data rates while managing device complexity through structured resource allocation and duplicate transmission patterns
Data Source
AI summary
The present specification proposes a technical feature for increasing a transmission range of a wireless LAN signal. The wireless LAN signal of the present specification, e.g. a transmission physical protocol data unit (PPDU), may be configured on the basis of a duplicate transmission mode. The transmission PPDU of the present specification may comprise a data unit duplicated in frequency. The data unit duplicated in frequency may be configured on the basis of a total bandwidth of the transmission PPDU. The transmission PPDU of the present specification proposes various training fields for the duplicated data unit.