Multi-band OFDMA Random Access Resource Allocation
Solution Overview
Problem
Current communication methods for next-generation Wireless Local Area Networks (WLAN) lack support for multi-band Uplink Orthogonal Frequency Division Multiple Access (OFDMA) based Random Access (UORA), which is essential for increasing peak throughput and capacity over multiple frequency bands like 2.4 GHz, 5 GHz, and 6 GHz bands.
Innovation Solution
A communication apparatus and method that operates in multiple bands by receiving a Trigger frame allocating Random Access Resource Units (RA-RUs), setting an OFDMA random access backoff counter, and randomly selecting eligible RA-RUs for transmission when the counter reaches zero, utilizing inter-band channel aggregation and specific contention windows for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-band operation is implemented to increase peak throughput and capacity, then data transmission rate and network capacity are improved, but device complexity and protocol implementation difficulty increase
Solution Approach 1:
The patent segments the multi-band operation into independent band-specific OCW parameters (OCW1 for 2.4GHz, OCW2 for 5GHz, OCW3 for 6GHz) and separate OBO counter mechanisms for each band. This allows each frequency band to be managed independently with its own contention window settings, reducing the complexity of coordinating multi-band operations while maintaining high throughput capabilities.
Solution Approach 2:
The patent introduces a new dimension to random access by implementing band-specific OCW parameters and OBO counter initialization for each frequency band (2.4GHz, 5GHz, 6GHz). This dimensional separation allows devices to perform random access independently in each band based on local OCW settings, simplifying multi-band coordination while maximizing overall network capacity and throughput.
2Productivity
If band-specific OCW parameters are used for random access, then contention management efficiency is improved, but protocol complexity increases
Solution Approach 1:
The patent applies local quality by configuring different OCW parameters (OCW1, OCW2, OCW3) specific to each frequency band's local conditions. Each band can have optimized contention window settings tailored to its traffic characteristics and interference environment, improving contention management efficiency while the modular structure keeps protocol complexity manageable through clear separation of band-specific parameters.
Data Source
AI summary
A station apparatus includes a receiver and a controller. The receiver, in operation, receives a Trigger frame allocating Random Access Resource Units (RA-RUs) over multiple bands. The Trigger frame includes a User Info field that comprises a Band Indication subfield for specifying a first band among the multiple bands, an RU Allocation subfield for indicating a first RA-RU of one or more contiguous RA-RUs in the first band, and a Number of RA-RU subfield for indicating a number of the contiguous RA-RUs minus one in the first band. The controller, in operation: sets a first Orthogonal Frequency Division Multiple Access (OFDMA) random access backoff (OBO) counter to 0 if an initial value of the first OBO counter is not larger than a number of eligible RA-RUs in the first band, which is a subset of contiguous RA-RUs in the Trigger frame; and randomly selects one of the eligible RA-RUs.