NGV Frame Configuration for Wideband WLAN Interoperability
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and require interoperability with legacy systems like 802.11p to enhance performance in both indoor and outdoor settings.
Innovation Solution
A method and device for configuring a New Generation Vehicular (NGV) frame that transmits signals over a wide band (20 MHz or wider) by duplicating specific fields of the legacy frame in a 10 MHz band, ensuring interoperability and backward compatibility between NGV and 802.11p systems, using a structure that includes Legacy-Short Training Field (L-STF), Legacy-Long Training Field (L-LTF), Legacy-Signal (L-SIG), Repeated Legacy (RL)-SIG, NGV-SIG, NGV-STF, NGV-LTF, and NGV-Data fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NGV frame is transmitted through wide band (20 MHz or wider), then throughput and communication speed are improved, but interference with legacy 802.11p systems occurs
Solution Approach 1:
The NGV frame is segmented into multiple 10 MHz subbands, with specific fields (L-STF, L-LTF, L-SIG, RL-SIG, NGV-SIG) duplicated in each subband while other fields are transmitted in the full wide band. This segmentation allows legacy 802.11p systems operating in 10 MHz bands to receive valid signals without interference, while NGV systems utilize the full 20 MHz or wider bandwidth for high throughput communication.
Solution Approach 2:
Different portions of the NGV frame are assigned different transmission characteristics: the legacy-compatible fields (L-STF, L-LTF, L-SIG, RL-SIG, NGV-SIG) are transmitted with quality optimized for legacy 802.11p reception in each 10 MHz subband, while the NGV-specific fields (NGV-STF, NGV-LTF, NGV-Data) utilize the full wide band for high-speed data transmission. This local quality differentiation resolves the contradiction between legacy compatibility and high throughput.
2Productivity
If NGV system operates in wide band, then spectrum efficiency is improved, but interoperability with legacy 802.11p system deteriorates
Solution Approach 1:
The NGV frame structure is designed with multi-functionality to serve both legacy 802.11p systems and next-generation NGV systems simultaneously. By duplicating legacy-compatible fields (L-STF, L-LTF, L-SIG, RL-SIG, NGV-SIG) in each 10 MHz subband, the frame structure becomes universally compatible: legacy systems can interpret the duplicated fields in their operating band, while NGV systems can process the full wide-band frame for high-speed communication, thus achieving both spectrum efficiency and interoperability.
Solution Approach 2:
The legacy frame fields (L-STF, L-LTF, L-SIG, RL-SIG) and NGV-SIG are copied and duplicated in each 10 MHz subband within the wide-band NGV frame. This copying mechanism ensures that legacy 802.11p systems can find and decode valid signal fields in their operating subband, maintaining interoperability while the overall wide-band structure enables high spectrum efficiency for NGV systems.
3Adaptability or versatility
If legacy fields are duplicated in 10 MHz bands, then backward compatibility is improved, but device complexity increases
Solution Approach 1:
The frame structure is segmented into distinct functional portions: duplicated legacy fields (L-STF, L-LTF, L-SIG, RL-SIG, NGV-SIG) in each 10 MHz subband and NGV-specific fields (NGV-STF, NGV-LTF, NGV-Data) in the full wide band. This segmentation provides a systematic approach to managing complexity by clearly defining which fields require duplication for compatibility and which fields utilize the full bandwidth for NGV functionality, making the increased complexity manageable and structured.
Data Source
AI summary
A method and device for transmitting an NGV frame in a wireless LAN system is proposed. Specifically, a transmission device generates an NGV frame and transmits the NGV frame through a first band. The NGV frame includes an L-STF, an L-LTF, an L-SIG, an NGV-SIG, an NGV-STF, an NGV-LTF, and NGV-Data. The L-STF, the L-LTF, the L-SIG, and the NGV-SIG are duplicated in units of second bands and transmitted through the first band. The NGV-STF, the NGV-LTF, and the NGV-Data are transmitted through a full band of the first band. The first band is a 20 MHz band, and a second band is a 10 MHz band.