Uplink OFDMA Resource Allocation for Channel Utilization
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Solution Overview
Problem
Existing point-to-point transmission methods in Wi-Fi systems, such as IEEE 802.11a/b/n/ac, are inadequate for meeting the high-speed service transmission requirements of next-generation Wi-Fi due to limitations in channel utilization and power matching issues during uplink and downlink data transmission.
Innovation Solution
Implementing an OFDMA technology based on the IEEE 802.11ax standard, where data in an uplink OFDMA PPDU is transmitted on a frequency resource unit, with specific fields of the common signaling portion transmitted on determinate fundamental channels, allowing multiple users to share resources and improve channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point-to-point transmission is used in existing Wi-Fi systems, then the system is simple to implement, but the service transmission rate cannot meet high-speed requirements due to channel limitations
Solution Approach 1:
The patent segments the frequency spectrum into multiple resource units (RUs) that can be independently allocated to different stations. This segmentation enables multiple users to transmit simultaneously on different frequency resources, thereby increasing the overall service transmission rate while maintaining manageable system complexity through structured resource allocation
Solution Approach 2:
The patent transitions from single-channel point-to-point transmission to multi-channel orthogonal frequency-division multiple access (OFDMA) transmission. By adding the frequency dimension with multiple resource units, the system achieves higher throughput while managing complexity through standardized OFDMA protocols and resource allocation mechanisms
2Productivity
If OFDMA technology is implemented with multiple resource units, then channel utilization improves, but the complexity of resource allocation and signaling increases
Solution Approach 1:
The patent implements preliminary resource allocation where the access point pre-assigns specific resource units to stations before data transmission. This preliminary action simplifies the transmission process by establishing clear frequency resource mappings in advance, improving channel utilization while managing complexity through proactive rather than reactive resource management
Solution Approach 2:
The patent incorporates feedback mechanisms where the access point monitors channel conditions and station requirements, then adjusts resource unit allocations accordingly. This feedback loop optimizes channel utilization dynamically while managing complexity through adaptive resource allocation based on actual network conditions
3Reliability
If common signaling portion is transmitted on all fundamental channels, then signaling completeness is ensured, but channel detection efficiency decreases causing users to miss idle channels
Solution Approach 1:
The patent extracts the common signaling portion from all fundamental channels and transmits it only on the resource unit where data transmission occurs. This extraction ensures signaling completeness for active transmissions while improving channel detection efficiency by reducing false busy signals on idle fundamental channels, allowing users to efficiently identify and utilize available spectrum resources
Data Source
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AI summary
The present invention discloses a data transmission method, apparatus, and system, and an access point. The method includes: transceiving data of a data portion in an uplink OFDMA PPDU scheduled by an access point AP on a corresponding allocated frequency resource unit RU, determining one or more fundamental channel units on which the allocated frequency resource unit RU is located, and transceiving at least some fields in a common signaling portion in the uplink OFDMA PPDU on the determined one or more fundamental channels. In this way, one or more fundamental channels for transceiving at least some fields in a common signaling portion in an uplink OFDMA PPDU are determinate, and another user can transceive data on another idle fundamental channel, thereby improving channel utilization. In addition, multiple users can simultaneously transceive data on multiple fundamental channels, thereby improving a service transmission rate.