OFDMA Subcarrier Allocation for HEW Networks
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Solution Overview
Problem
Existing wireless local-area networks face inefficiencies in communication due to limited resources and the need to coexist with multiple standards, particularly in high-efficiency wireless networks like IEEE 802.11ax, which struggles with power usage and synchronization in OFDMA systems.
Innovation Solution
The implementation of an OFDMA tone allocation for distributed sub-channels with extended symbol duration and guard subcarriers, allowing for increased transmission power within FCC regulations, and the use of a configuration table for subcarrier allocation, enabling greater bandwidth reuse and compatibility with legacy devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission power is increased to improve communication efficiency and operating range, then throughput and coverage are improved, but regulatory power limitations are exceeded
Solution Approach 1:
The patent divides the frequency spectrum into multiple noncontiguous sub-channels, each with its own power spectral density limits. This segmentation allows the system to transmit at higher total power across distributed subcarriers while maintaining compliance with per-subchannel power spectral density regulations, thereby improving communication efficiency without violating regulatory constraints.
Solution Approach 2:
The patent transitions from contiguous to noncontiguous sub-channel allocation in the frequency domain, distributing subcarriers across multiple separated frequency bands. This dimensional change in resource allocation enables the system to achieve higher effective transmission power and improved throughput while adhering to power spectral density limitations on each individual sub-channel.
2Device complexity
If sub-channels are allocated contiguously to simplify resource management, then device complexity is reduced, but bandwidth reuse and coexistence with legacy systems are limited
Solution Approach 1:
The patent segments the available spectrum into multiple noncontiguous sub-channels that can be independently allocated to different users and standards. This segmentation enables finer-grained resource management, improved bandwidth reuse, and better coexistence with legacy systems while maintaining manageable complexity through standardized allocation patterns defined in configuration tables.
Solution Approach 2:
The patent creates a universal resource allocation framework using configuration tables that can accommodate both legacy and high-efficiency wireless standards within the same OFDMA system. This multi-functional approach allows the system to serve multiple purposes and support diverse devices while maintaining a unified resource management structure.
3Measurement precision
If symbol duration is extended to improve synchronization accuracy, then measurement precision is improved, but transmission speed is reduced
Solution Approach 1:
The patent employs periodic synchronization signals embedded within the extended symbol structure, allowing the receiver to achieve accurate synchronization through repeated measurements over multiple periods. This periodic approach maintains synchronization precision while enabling faster effective data transmission by utilizing the full extended symbol duration for both synchronization and data carrying.
Data Source
AI summary
Methods, devices and a computer-readable medium are disclosed for subcarrier allocation to multiple users in wireless local-area networks in accordance with orthogonal frequency division multiple access (OFDMA). A high-efficiency wireless local-area network (HEW) master device is disclosed. The HEW master device includes circuitry configured to transmit data to a plurality of HEW devices, in accordance with OFDMA, on a plurality of noncontiguous sub-channels. Each noncontiguous sub-channel may be a plurality of subcarriers across a bandwidth. A HEW device is disclosed. The HEW device may include circuitry configured to transmit data to a HEW master device, in accordance with OFDMA and a resource map, on a noncontiguous sub-channel over a bandwidth. The circuitry may be further configured to transmit the noncontiguous subcarriers at a greater power level than a regulatory power level for the plurality of interlaced subcarriers if the plurality of interlaced subcarriers were contiguous.