NGV Ranging NDP Frame Encoding for IEEE 802.11bd Distance Estimation
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Solution Overview
Problem
The next generation vehicle-to-everything (NGV) communication system lacks defined procedures for ranging and associated control signaling, particularly in accordance with the IEEE 802.11bd standard, which is essential for wireless local area networks (WLANs) and vehicle-to-everything (V2X) communications.
Innovation Solution
The implementation of a non-trigger-based NGV ranging process using NGV ranging null-data packet (NDP) announcement (NDPA) frames and initiator-to-responder (I2R) NGV ranging NDP frames, encoded with specific fields such as NGV signal field (NGV-SIG), repeated NGV-SIG, NGV Short Training field (NGV-STF), and NGV Long Training Field (NGV-LTF), which includes symbol formats like NGV-LTF-2x for enhanced signal energy and repetition, to facilitate accurate ranging within the 802.11bd band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ranging procedures and control signaling are defined for NGV communication in accordance with IEEE 802.11bd, then measurement precision and reliability of distance estimation are improved, but device complexity and protocol overhead increase
Solution Approach 1:
The ranging process is segmented into distinct phases with specific frame types: NDPA frames for announcement and configuration, NDP frames for actual ranging measurements, and LMR frames for measurement reports. Each frame type has a specific function, allowing the system to achieve precise ranging while managing complexity through structured segmentation of the ranging procedure.
Solution Approach 2:
The NDPA (Null Data Packet Announcement) frame is transmitted beforehand to configure the ranging process, specifying parameters such as LTF repetition counts and spatial stream configurations. This preliminary action allows the receiving station to prepare appropriate measurement procedures in advance, improving measurement precision while maintaining organized protocol flow.
2Measurement precision
If NGV-LTF with symbol repetition is used to enhance signal energy for accurate ranging, then measurement precision is improved, but duration of action and transmission time increase
Solution Approach 1:
The system dynamically configures the NGV-LTF symbol repetition count based on channel conditions and ranging requirements. The NDPA frame specifies the LTF repetition count, allowing the system to adapt the transmission duration: using higher repetition counts (e.g., 2x, 4x) in challenging channel conditions to improve measurement accuracy, and lower counts in good conditions to minimize transmission time.
Solution Approach 2:
The patent changes the parameter of LTF symbol repetition count to control signal energy. By varying this parameter (1 repetition, 2 repetitions, 4 repetitions), the system can adjust the effective signal energy and duration to achieve the required measurement precision while balancing transmission time constraints.
3Reliability
If multiple spatial streams and LTF repetitions are configured for robust ranging, then reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The NDPA frame structure is designed to be universal, accommodating multiple spatial streams and varying LTF repetition counts through a single standardized framework. The frame includes fields that can specify different configurations (number of spatial streams, LTF repetition count) without requiring separate protocol definitions, thus improving reliability through multi-stream support while managing complexity through universal frame design.
4Productivity
If non-trigger-based ranging is implemented with immediate feedback, then productivity and response time are improved, but device complexity increases
Solution Approach 1:
The patent implements immediate feedback through the LMR (Location Measurement Report) frame, which is transmitted right after the NDP reception. The feedback mechanism provides real ranging measurements (time of arrival, distance estimates) without requiring trigger frames or extended negotiation, thus improving productivity and response time while the standardized LMR frame structure keeps the feedback mechanism relatively simple.
Data Source
AI summary
A next generation vehicle-to-everything (NGV) station (STA) operating as an initiating station (ISTA) for performing non-trigger-based NGV ranging may encode an NGV ranging null-data packet (NDP) announcement (NGV NDPA) frame for transmission to a responding station (RSTA) to initiate the non-trigger-based NGV ranging. The NGV STA may also encode an initiator-to-responder (I2R) NGV ranging null-data packet (NDP) (I2R NGV ranging NDP) for transmission following the NGV NDPA frame. The I2R NGV ranging NDP may be encoded in accordance with a NGV Ranging NDP format that may include an NGV signal field (NGV-SIG), a repeated NGV-SIG (RNGV-SIG), an NGV Short Training field (NGV-STF) and an NGV long training field (NGV-LTF). The NGV-LTF may include one or two sets of LTF symbols depending on a number of LTF symbol repetitions (LTF_REP). Each set of LTF symbols may have one or two LTF symbols depending on a number of spatial streams (NUM_SS) and the NGV-LTF may be encoded without a packet extension (PE).