HEW Transmission Signaling Structure for OFDMA Bandwidth Allocation
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Solution Overview
Problem
High Efficiency WLAN (HEW) devices face challenges in coexisting with legacy devices and efficiently allocating bandwidth, particularly in high-density scenarios where many devices compete for the wireless medium with low to moderate data rate requirements.
Innovation Solution
The implementation of a transmission signaling structure that uses OFDMA techniques, allowing HEW devices to communicate through scheduled orthogonal frequency division multiple access (OFDMA) subchannels, enabling efficient configuration and utilization of bandwidth, and allowing coexistence with legacy devices by using a separate HEW signal field for each 20 MHz channel, configuring devices for specific OFDMA and MU-MIMO resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HEW devices use traditional Wi-Fi communication methods to coexist with legacy devices, then compatibility is maintained, but bandwidth allocation efficiency deteriorates in high-density scenarios
Solution Approach 1:
The patent segments the 20 MHz channel into multiple OFDMA subchannels, each capable of being independently allocated to different HEW stations. This segmentation allows efficient bandwidth utilization in high-density scenarios while maintaining compatibility with legacy devices that operate on the full 20 MHz channel, as the OFDMA structure is transparent to legacy devices.
2Productivity
If HEW devices allocate bandwidth efficiently for high-density scenarios, then throughput increases, but coexistence with legacy devices becomes difficult
Solution Approach 1:
The OFDMA signal structure serves multiple functions: it provides efficient bandwidth allocation for HEW devices while remaining transparent to legacy devices. The same physical layer structure supports both HEW-specific resource allocation and legacy Wi-Fi operation, enabling universal compatibility across device types.
3Device complexity
If a single signal field is used for all 20 MHz channels, then signal structure simplicity is maintained, but bandwidth configuration flexibility deteriorates
Solution Approach 1:
The patent introduces a new dimension to the signal structure by adding a Heew-Sig-A2 field that operates alongside the existing Heew-Sig-A1 field. This additional dimension enables independent configuration of OFDMA subchannel allocations without complicating the basic signal structure, allowing flexible bandwidth configuration while maintaining signal simplicity.
Data Source
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AI summary
Embodiments of a transmission signaling structure for HEW are defined to carry packet information to configure OFDMA receivers for demodulation of a specific portion of the packet and/or to configure receivers for transmission using specific OFDMA and MU-MIMO resources. In some embodiments, the specific portion of the packet comprises one or more minimum bandwidth units of one or more 20 MHz channels. Each 20 MHz bandwidth structure may comprise several minimum bandwidth units to allow each 20 MHz channel to have a have smaller granularity than 20 MHz.