MIMO Physical Layer Parsing for Punctured Transmission
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Solution Overview
Problem
In wireless communication systems, especially those operating under IEEE standards like 802.11ax and 802.11be, interference from non-WiFi licensed devices or overlapping basic service sets (OBSS) can puncture subchannels, rendering them unavailable for data transmission, leading to reduced effective bandwidth and throughput.
Innovation Solution
The implementation of a physical layer parsing mechanism in MIMO wireless systems that allocates bits proportionally to available frequency segments using a round robin scheme, dividing the frequency range into resource units (RUs) that avoid punctured subchannels, and encoding data units with LDPC codes to improve transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional OFDMA transmission is used, then system simplicity is maintained, but per-device throughput is reduced due to punctured subchannels
Solution Approach 1:
The patent segments the frequency spectrum into multiple frequency segments, where each segment can be independently allocated to different users. This segmentation allows the system to avoid punctured subchannels by allocating only non-punctured frequency segments to users, thereby maintaining high throughput while managing complexity through modular frequency resource management.
Solution Approach 2:
The patent implements dynamic frequency segment allocation where the physical layer parser dynamically determines which frequency segments are available (non-punctured) and allocates them to users in real-time. This dynamic approach allows the system to adapt to varying puncturing patterns and maximize per-device throughput by continuously optimizing resource allocation based on current channel conditions.
2Productivity
If frequency segments are allocated to avoid punctured subchannels, then effective bandwidth utilization is improved, but resource allocation complexity increases
Solution Approach 1:
The patent performs preliminary identification of punctured subchannels before resource allocation. The system first determines which subchannels are affected by interference, then pre-calculates available frequency segments that avoid these punctured subchannels. This preliminary action simplifies subsequent resource allocation by providing a pre-filtered set of valid frequency segments for allocation to users.
Solution Approach 2:
The patent applies local quality by treating different frequency segments with different allocation strategies based on their puncturing status. Non-punctured frequency segments are allocated to users with full resource allocation, while punctured segments are either excluded or allocated with reduced resources. This localized approach optimizes bandwidth utilization by maximizing use of good frequency segments while minimizing the impact of bad ones.
3Productivity
If MIMO punctured transmission is implemented, then per-device throughput is enhanced, but parsing mechanism complexity increases
Solution Approach 1:
The patent segments both frequency resources and spatial streams independently. The physical layer parser processes each frequency segment and spatial stream separately, allowing MIMO punctured transmission to be implemented through modular processing. This segmentation enables enhanced throughput by utilizing multiple spatial streams across multiple frequency segments while managing parsing complexity through divide-and-conquer processing.
Solution Approach 2:
The patent changes the parsing approach from traditional OFDMA parameter sets to MIMO-specific parameter sets that account for punctured subchannels. The physical layer parser is configured with modified parameters including puncturing patterns, frequency segment allocations, and spatial stream mappings. These parameter changes enable the system to achieve enhanced per-device throughput through MIMO while the parser adapts to the new parameter structure.
Data Source
AI summary
A data unit comprising bits to transmit over one or more frequency segments in a frequency range is obtained. An effective bandwidth in each frequency segment of the frequency range is determined, where the effective bandwidth excludes bandwidth of one or more punctured subchannels in a respective frequency segment. Bits are encoded based on the effective bandwidth of each frequency segment followed by parsing the encoded bits to one or more streams and parsing the encoded bits of a stream to the one or more frequency segments. The parsing of the encoded bits of the stream comprises allocating a first number of consecutive encoded bits to a first frequency segment and allocating a second number of consecutive encoded bits to a second frequency segment, wherein the first number and the second number are based on the effective bandwidth of the first frequency segment and the second frequency segment. The encoded bits are modulated and mapped to subcarriers for transmission.