HEW Preamble Signaling via L-SIG Modulo and Polarity
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Solution Overview
Problem
Existing wireless local area networks (WLANs) face challenges in transmitting and receiving packets with legacy preambles, particularly when multiple standards like IEEE 802.11ax need to coexist with legacy versions, leading to inefficiencies in signaling high-efficiency packet formats.
Innovation Solution
The implementation of a modulation and coding scheme (MCS) field in the HEW signal field to jointly signal MCS and low-density parity check (LDPC) or MCS and space-time block coding (STBC), using repeated legacy signal fields (L-SIG) to indicate packet formats, allowing HEW devices to quickly decode and adapt to different standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy preambles are used in WLAN packets, then compatibility with legacy IEEE 802.11 standards is maintained, but signaling efficiency for high-efficiency packet formats deteriorates
Solution Approach 1:
The patent combines legacy L-SIG field structure with new HEW format signaling capabilities by merging the repeated L-SIG approach (legacy technique) with enhanced MCS field encoding (new technique) to simultaneously maintain legacy compatibility and improve HEW signaling efficiency
Solution Approach 2:
The L-SIG field is designed to serve dual purposes: maintaining backward compatibility with legacy 802.11 devices while simultaneously carrying enhanced signaling information for HEW devices through the repeated L-SIG mechanism and extended MCS field interpretations
2Adaptability or versatility
If multiple IEEE 802.11 standards operate simultaneously in a WLAN, then network versatility is improved, but packet format identification complexity increases
Solution Approach 1:
The repeated L-SIG field provides preliminary format identification information before the main packet data, allowing HEW devices to quickly determine the packet format and coding scheme in advance, reducing the complexity of real-time packet format identification
Solution Approach 2:
The enhanced MCS field acts as an intermediary that carries dual-purpose information: traditional MCS data for legacy devices and additional format indication bits for HEW devices, simplifying the multi-standard identification process
3Productivity
If the MCS field is used to jointly signal MCS and LDPC or STBC, then signaling compactness is improved, but decoding complexity increases
Solution Approach 1:
The patent merges multiple signaling functions (MCS indication, LDPC indication, STBC indication) into the single MCS field by combining them with the repeated L-SIG approach, achieving compact signaling while distributing the decoding complexity across multiple field interpretations
Data Source
AI summary
Methods, apparatuses, and computer readable media for signaling high-efficiency packet formats using a legacy portion of the preamble in wireless local-area networks are disclosed. A high-efficiency (HE) wireless local area network (HEW) device including circuitry is disclosed. The circuitry may be configured to generate a HE packet comprising a legacy signal field (L-SIG) followed by one or more HE signal fields, and configure the L-SIG to signal to a second HEW device either a first packet format of the HE packet or a second packet format of the HE packet, where a length of the L-SIG modulo 3 is used to signal the first packet format or the second packet format. The circuitry may be configured to generate a duplicated L-SIG field with a polarity difference to indicate a third packet configuration of the HE packet or a fourth packet configuration of the HE packet.