Fixed-Size Index Field for Resource Unit Allocation in Wireless LAN
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and outdoor settings, where existing technologies struggle to efficiently manage resource unit allocation for multiple users across different bands.
Innovation Solution
A method is introduced where an access point transmits a downlink physical protocol data unit (PPDU) with a trigger frame that allocates resource units to multiple receiving stations, using a fixed-size index field to efficiently indicate resource units across multiple bands without relying on bitmaps or start/offset signaling, enabling efficient uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a bitmap or start/offset signaling method is used to indicate resource units, then resource unit allocation can be achieved, but the signaling overhead increases and spectrum efficiency deteriorates
Solution Approach 1:
The patent changes the parameter representation method from bitmap (binary sequence) or start/offset (two separate values) to a unified index value. This parameter transformation reduces the number of bits required for signaling while maintaining the ability to uniquely identify resource units across multiple bands, thereby improving spectrum efficiency without sacrificing allocation capability.
Solution Approach 2:
The patent creates a universal indexing system that works across multiple frequency bands (2.4 GHz, 5 GHz, 6 GHz) and multiple resource unit configurations. The same index field structure and encoding method can indicate resource units in different bands and different sizes, eliminating the need for separate signaling mechanisms for each band or configuration scenario.
2Measurement precision
If multiple index groups are used to indicate different resource units in different bands, then resource unit indication accuracy improves, but the device complexity increases
Solution Approach 1:
The patent segments the resource unit indication space into multiple index groups, where each group corresponds to a specific frequency band or resource unit size category. This segmentation allows precise indication within each group while maintaining a systematic overall structure. The index field is divided into logical groups that can be independently interpreted based on the band configuration.
Solution Approach 2:
The patent adds a dimensional organization to the index structure by creating index groups that correspond to different frequency bands or resource unit types. This dimensional approach allows the system to handle multiple bands and configurations systematically, improving indication accuracy while the structured grouping prevents exponential growth in complexity.
Data Source
AI summary
Provided is a method for receiving an uplink PPDU by using a plurality of RUs through a specific band in a wireless LAN system in which a plurality of bands is supported. Transmission of the uplink PPDU is disclosed by a trigger frame and the trigger frame indicates information on an identifier and a frequency resource of each station. In the trigger frame, an index field indicating the RU may be configured with the same size regardless of a bandwidth. To this end, a plurality of index groups is used instead of a method indicating a bitmap field or a start point/offset. A first index group of the index field may be used to indicate a first RU and a second index group of the index field may be used to indicate a second RU.