Tone Block Allocation for MU-MIMO OFDMA Signaling
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Solution Overview
Problem
Current wireless local area networks (WLANs) face inefficiencies in resource allocation for multi-user, multiple input multiple output (MU-MIMO) orthogonal frequency division multiple access (OFDMA) data units, particularly in signaling overhead and spatial stream allocation, which affects data throughput and compatibility with diverse device sets.
Innovation Solution
The method involves selecting contiguous tone blocks and corresponding spatial stream allocations for MU-MIMO OFDMA data units, encoding these allocations, and transmitting them to device sets, allowing for efficient data transmission and decoding across multiple devices using hierarchical codebooks and device identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional resource allocation signaling is used for MU-MIMO OFDMA data units, then device compatibility is maintained, but signaling overhead increases and data throughput decreases
Solution Approach 1:
The resource allocation signaling is segmented into multiple fields: a first field containing a resource allocation indicator that points to predetermined allocations stored in hierarchical codebooks, and second fields containing device identifier information. This segmentation allows efficient representation of tone block allocations and spatial stream assignments without transmitting complete allocation details, thereby reducing signaling overhead while maintaining high data throughput for MU-MIMO OFDMA operations
Solution Approach 2:
Predetermined resource allocations are pre-stored in hierarchical codebooks at the access point. The resource allocation indicator in the first field points to these pre-defined allocations, allowing receivers to retrieve complete allocation information without receiving all details in the signaling. This preliminary preparation of allocation patterns enables efficient resource assignment while minimizing the amount of signaling data that must be transmitted
2Manufacturing precision
If detailed spatial stream allocation signaling is transmitted for each tone block, then allocation precision is improved, but signaling overhead increases
Solution Approach 1:
The patent applies different levels of allocation detail to different resource blocks based on their characteristics. The resource allocation indicator provides coarse-grained allocation information pointing to predetermined patterns in hierarchical codebooks, while more detailed spatial stream allocations are provided only where needed through selective signaling in second fields. This local differentiation of allocation precision maintains accuracy for specific tone blocks while reducing overall signaling overhead
Solution Approach 2:
Detailed spatial stream allocation patterns are pre-computed and stored in hierarchical codebooks. The signaling only transmits indicators pointing to these pre-defined patterns rather than complete allocation details. This preliminary preparation of allocation patterns enables precise resource assignment to be achieved with minimal signaling overhead, as the detailed allocation information is already available in the codebooks
3Productivity
If contiguous tone blocks are allocated to device sets, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The resource allocation is segmented into device sets, where each device set receives allocations from the hierarchical codebooks. The resource allocation indicator and device identifier fields enable efficient mapping of contiguous tone blocks to specific device sets without requiring complex processing at each device. This segmentation approach maintains resource allocation efficiency while managing device complexity through structured information organization
Data Source
AI summary
A method is described. A block allocation that indicates a plurality of contiguous tone blocks of a wireless local area network communication channel is selected for a multi-user, multiple input multiple output (MU-MIMO) orthogonal frequency division multiple access (OFDMA) data unit. A contiguous tone block corresponds to a respective device set having at least one communication device. Respective spatial stream allocations are selected, for at least some of the blocks, that indicate a number of spatial streams for the corresponding block of the data unit. The number of streams of a block is equal to a number of communication devices of the device set that corresponds to the block. A first field is encoded and transmitted to indicate the selected block allocation and the selected spatial stream allocations. A second field is encoded and transmitted to indicate a respective device identifier for each communication device of the respective device sets.