Cyclic Multi-RU Bit Allocation for IEEE 802.11ax Reliability
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Solution Overview
Problem
Existing communication systems, such as IEEE 802.11ax, are limited in allocating resource units (RUs) to a single user, leading to increased error rates due to interference or noise in certain RUs, which can be mitigated by assigning multiple RUs to a single user.
Innovation Solution
A communication device and method that allocates bits of an encoded bit stream alternately to multiple resource units of varying sizes, ensuring the number of bits is proportional to the number of tones covered by each unit, and adjusts ratios based on tone number and modulation order to enhance diversity and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single resource unit is allocated to a user, then the device complexity is reduced, but the reliability deteriorates due to interference or noise in certain RUs
Solution Approach 1:
The patent divides the resource allocation into multiple resource units (RUs) of different sizes (26-tone, 52-tone, 106-tone, 242-tone RUs). Instead of allocating a single RU to a user, the system segments the available spectrum into multiple RUs and allocates multiple RUs to a single user, thereby diversifying the transmission paths and reducing the impact of interference or noise in any single RU.
Solution Approach 2:
The patent introduces a cyclic bit allocation pattern with varying ratios (e.g., 1:2, 2:1, 1:3, 3:1) for distributing encoded bits across multiple RUs. This parameter change in allocation ratios allows flexible adaptation to different RU configurations and channel conditions, optimizing reliability while managing complexity through standardized allocation patterns.
2Reliability
If multiple resource units are allocated to a single user, then the reliability improves through diversity, but the device complexity increases
Solution Approach 1:
The patent implements a cyclic bit allocation pattern where bits are distributed across multiple RUs in a repeating sequence. The cyclic pattern with defined ratios (1:2, 2:1, 1:3, 3:1) provides periodic action that ensures diverse bit distribution across RUs of different sizes, improving error correction capability while maintaining manageable complexity through the regular, predictable allocation structure.
Solution Approach 2:
The system changes the allocation parameters by using different ratios of consecutive bits assigned to different RUs within the same cyclic pattern. This parameter variation allows the system to adapt to different RU size combinations and modulation orders, optimizing reliability without requiring completely different allocation algorithms for each scenario.
3Manufacturing precision
If bits are allocated proportionally to the number of tones, then the manufacturing precision is improved, but the loss of information increases due to interference in specific RUs
Solution Approach 1:
The patent segments the encoded bit stream into multiple groups that are allocated to different RUs based on their tone capacities. By dividing the bit stream and distributing it across multiple segmented RUs rather than allocating all bits to a single RU, the system reduces the impact of interference in any specific RU, thereby reducing information loss while maintaining precise proportional allocation.
Solution Approach 2:
The patent adjusts the allocation parameters by using cyclic patterns with varying ratios of bits assigned to different RUs. This parameter change allows the system to optimize the distribution of bits across RUs with different numbers of tones, ensuring that proportional allocation is maintained while diversifying the transmission to reduce information loss due to interference.
4Reliability
If alternating bit allocation is used across multiple RUs, then the reliability improves through diversity, but the ease of operation deteriorates
Solution Approach 1:
The patent employs a cyclic bit allocation pattern that repeats periodically across multiple RUs. This periodic action with defined ratios (1:2, 2:1, 1:3, 3:1) provides a systematic and repeatable method for distributing bits, improving transmission reliability through diversity while maintaining ease of operation through the regular, predictable structure that can be implemented using standardized algorithms.
Solution Approach 2:
The system uses parameter changes in the form of different allocation ratios within the cyclic pattern to adapt to different RU configurations. This approach maintains ease of operation by using a unified cyclic framework that can accommodate various RU size combinations through simple parameter adjustments rather than requiring completely different allocation logic.
Data Source
AI summary
In communication devices and methods configured to communicate with each other, bits of a continuous bit stream are allocated to resource units of different sizes. Various options are disclosed that differ in both implementation complexity and diversity achieved. Furthermore, exemplary implementations are provided that consider the definition of resource units of IEEE802.11ax as a baseline and outline the operation of the bit allocation for combination of resource units of various sizes.