OFDMA Resource Unit Multiplexing for WLAN Efficiency
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Solution Overview
Problem
In OFDMA transmission in WLAN networks, especially in scenarios with small data packet transmissions like interactive media and online gaming, there is a low resource utilization due to the need for padding with useless bits in resource units (RUs), leading to inefficient use of available resources.
Innovation Solution
An OFDMA transmission method where an access point allocates the same resource unit to multiple stations, sending downlink data and pilot symbols in a time or code division multiplexing manner, allowing multiple stations to multiplex a single RU, thereby improving resource utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single resource unit (RU) is allocated to one station for small data packet transmission, then the station can transmit data timely, but the RU cannot be fully utilized within the limited time period, causing low resource utilization
Solution Approach 1:
The patent merges multiple stations into a single resource unit (RU) structure, allowing multiple stations to share the same RU through multiplexing techniques. This combines previously separate transmission resources into a unified structure that serves multiple users simultaneously, thereby improving overall resource utilization while maintaining timely data transmission for each station.
Solution Approach 2:
The patent makes the resource unit (RU) universal by enabling it to serve multiple stations simultaneously through the introduction of a station indication field. The RU structure is enhanced to perform multiple functions - serving as a shared resource for multiple stations rather than being dedicated to a single station, thus improving resource utilization efficiency.
2Device complexity
If all data in one station is transmitted by using one RU, then transmission is simplified, but the station cannot fully use the RU occupied by the station in a limited time period, requiring padding with useless bits
Solution Approach 1:
The patent combines multiple stations into a single RU structure with multiplexing, allowing the RU to be fully utilized by serving multiple users. This eliminates the need for padding while maintaining transmission simplicity through the unified RU structure that handles multiple stations efficiently.
Solution Approach 2:
The patent introduces dynamic station indication fields that enable the RU structure to adaptively indicate which stations are using the resource. This dynamic element allows the system to flexibly allocate the RU to different combinations of stations based on actual data transmission needs, maximizing resource utilization without requiring padding.
Data Source
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Figure 3A
AI summary
Embodiments of the present invention provide an OFDMA transmission method, an access point AP, and a station. The method includes: allocating, by an access point AP, a same resource unit RU to multiple stations, where the RU is one or more subcarriers in a frequency domain; and sending, by the AP and on the same resource unit RU, downlink data to the multiple stations in a time division multiplexing manner or a code division multiplexing manner, and sending, by the AP and on the same resource unit RU, pilot symbols to the multiple stations. In this way, the AP may send, on the same resource unit RU, the downlink data and the pilot symbols to the multiple stations within a limited time, thereby improving resource utilization efficiency.