Modified SIG Field Subcarrier Modulation for Wireless Packet Classification
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Solution Overview
Problem
Current communication systems lack effective means to distinguish and process communications among various standards, protocols, and recommended practices in wireless communication systems, particularly in dense deployments where multiple devices operate within a given area, leading to performance issues.
Innovation Solution
The implementation of novel architectures and methods that utilize orthogonal frequency division multiplexing (OFDM) and orthogonal frequency division multiple access (OFDMA) packets with specific preamble designs, including variable length signal fields and modulation coding sets, to classify and process packets based on IEEE 802.11 standards, enabling improved spatial reuse and performance in dense wireless networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple wireless communication devices operate within a given area in dense deployments, then network coverage and connectivity are improved, but performance deteriorates due to interference and difficulty in distinguishing communications among various standards
Solution Approach 1:
The patent segments the frequency spectrum into multiple orthogonal subcarriers and divides communication resources among different devices and standards. By using OFDM to split the broadband channel into numerous narrowband subchannels, each device can be assigned specific subcarriers, reducing interference in dense deployments while maintaining overall network capacity.
Solution Approach 2:
The patent introduces a standardized preamble structure with signal fields as an intermediary mechanism that enables receiving devices to identify and classify incoming packets according to their communication standard before full processing. This intermediary classification layer allows multiple standards to coexist in the same physical medium without conflict.
2Adaptability or versatility
If various communication standards and protocols are supported, then system versatility is improved, but the ability to distinguish and process communications effectively deteriorates
Solution Approach 1:
The patent implements preliminary classification of communication packets by embedding standard-specific identification information in the preamble and signal fields before the main data payload. This preliminary action allows receiving devices to quickly identify the communication standard and configure appropriate processing parameters before attempting to decode the actual data, significantly reducing the difficulty of handling multiple standards.
Solution Approach 2:
The patent uses modulation coding sets (MCS) and signal field configurations as distinctive markers or 'colors' that differentiate various communication standards and packet types. By assigning specific modulation schemes, coding rates, and signal field structures to different standards, the system enables easy identification and classification of incoming packets based on these distinctive characteristics.
3Productivity
If spatial reuse is improved in dense networks, then network capacity is enhanced, but packet classification and processing accuracy deteriorates
Solution Approach 1:
The patent resolves the conflict between spatial reuse and classification accuracy by adding frequency and time dimensions to the classification process. Instead of relying solely on spatial separation, the system uses orthogonal frequency division multiple access (OFDMA) to assign different subcarrier sets to different devices and uses time-division aspects within the packet structure (preamble, signal fields, data fields) to enable accurate classification even when multiple devices transmit simultaneously in different frequency resources.
Data Source
AI summary
A wireless communication device (‘device’) is configured to generate an OFDM/A packet that includes at least one OFDM/A symbol that includes at least one SIG having SIG information modulated on only even (or odd) sub-carriers and does not include any information modulated on odd (or even) sub-carriers of a set of OFDM/A sub-carriers. The set of OFDM/A sub-carriers may be all or less than all of available sub-carriers. The device may generate the packet to include a preamble and a payload such that the payload, which may be composed of at least one additional OFDM/A symbol, includes data modulated on some or all of the sub-carriers of the set of OFDM/A sub-carriers. The device can modulate and transmit SIG information and data differently within the preamble and the payload (e.g., with higher ordered modulation or MCS for the data and less power per sub-carrier than for the preamble).