Wireless LAN PPDU RU Allocation for Discontiguous Subcarriers
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Solution Overview
Problem
Existing wireless LAN technologies face challenges in improving transmission rates, reliability, and reducing latency, particularly in supporting low latency and ultra-high reliability (UHR) with efficient utilization of multiple bands and spatial streams.
Innovation Solution
The method involves generating and transmitting a PPDU within an 80MHz frequency bandwidth using resource units (RUs) that include discontiguous subcarriers, with their locations indicated in an ascending order based on the lowest subcarrier, and processing such PDUs to improve transmission power and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RUs comprising discontiguous subcarriers are used, then transmission power is improved and throughput increases, but signaling overhead for RU allocation increases
Solution Approach 1:
The 80MHz frequency bandwidth is segmented into multiple RUs with discontiguous subcarriers, allowing flexible resource allocation. Each RU is defined by a starting subcarrier index and a size, enabling efficient segmentation of the frequency spectrum to improve throughput while managing signaling overhead through structured allocation patterns.
Solution Approach 2:
The patent changes the parameter representation of RU allocation by introducing a specific encoding scheme where the RU allocation subfield indicates the starting subcarrier index and size. This parameter change allows discontiguous subcarrier allocation to be efficiently represented, reducing the signaling overhead compared to traditional contiguous allocation methods.
2Reliability
If discontiguous subcarriers are allocated in RUs, then transmission power and coverage are improved, but the complexity of RU allocation signaling increases
Solution Approach 1:
The patent simplifies the RU allocation signaling by changing how parameters are represented. Instead of complex descriptors for discontiguous subcarriers, the system uses a streamlined encoding where the RU allocation subfield directly indicates the starting subcarrier index and RU size, reducing the computational complexity for both transmission and reception of allocation information.
Solution Approach 2:
The patent inverts the traditional approach by defining RUs based on discontiguous subcarrier patterns rather than contiguous blocks. This inversion allows the system to achieve better power distribution and coverage by strategically placing subcarriers across the frequency spectrum, while the standardized pattern recognition simplifies the allocation signaling complexity.
3Power
If RUs with discontiguous subcarriers are used, then transmission power is improved, but the device complexity for processing such PPDUs increases
Solution Approach 1:
The PPDU processing is segmented into distinct stages: preamble decoding, RU allocation interpretation, and data demodulation. By segmenting the processing flow and providing clear rules for interpreting discontiguous subcarrier allocations, the patent reduces the overall device complexity while maintaining improved transmission power through flexible RU structures.
Solution Approach 2:
The patent changes the parameter representation in the RU allocation subfield to enable more efficient processing. The standardized encoding of starting subcarrier indices and RU sizes allows receiving devices to quickly parse and process discontiguous subcarrier allocations without excessive computational complexity, while still achieving improved transmission power distribution.
Data Source
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AI summary
A method and a device for transmitting and receiving a PPDU in a wireless LAN system are disclosed. The method performed by means of a first STA, according to one embodiment of the disclosure, may comprise the steps of: generating a physical protocol data unit (PPDU) to be transmitted within a 80MHz frequency bandwidth; and transmitting the PPDU to a second STA.