Cooperative Sounding via Coherent Subcarrier Allocation
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Solution Overview
Problem
Existing wireless network systems face inefficiencies in collaborative AP sounding due to the need for extensive channel information collection, leading to significant overhead and potential performance degradation, especially in deployments with narrow coherence bandwidth.
Innovation Solution
The method involves determining subcarrier coherence bandwidth among multiple APs, generating a mapping to identify interchangeable subcarriers, and dynamically grouping APs for efficient collaborative sounding, minimizing overhead by allocating subcarriers based on coherence data and ensuring adequate information for joint transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive channel information collection is performed for collaborative AP sounding, then accurate channel knowledge is obtained, but overhead increases significantly
Solution Approach 1:
The patent segments the frequency spectrum into multiple subcarriers and divides the channel sounding process across these subcarriers. Different APs are assigned to sound different subcarriers based on coherence bandwidth, allowing parallel collection of channel information without requiring every AP to sound every frequency, thus reducing overhead while maintaining accuracy.
Solution Approach 2:
The patent applies partial action by having APs sound only a subset of subcarriers rather than the complete spectrum. Based on coherence bandwidth analysis, each AP sounds only the necessary portion of the spectrum required for accurate channel knowledge, avoiding redundant measurements and reducing overall overhead.
2Reliability
If all APs sound all subcarriers, then complete channel coverage is achieved, but sounding time increases
Solution Approach 1:
The patent segments both the AP set and subcarrier set into groups based on coherence bandwidth characteristics. Multiple AP groups simultaneously sound different subcarrier groups in parallel, achieving complete channel coverage across all frequency bands while reducing total sounding time through concurrent operations.
Solution Approach 2:
The patent introduces a new dimension of parallelism by organizing APs and subcarriers into multiple independent sounding groups that operate simultaneously. This transforms the sequential sounding process into a parallel multi-dimensional operation, covering the entire frequency spectrum faster without sacrificing reliability.
3Productivity
If coherent subcarrier assignment is used for collaborative sounding, then sounding efficiency improves, but system complexity increases
Solution Approach 1:
The patent performs preliminary coherence bandwidth analysis and subcarrier coherence determination before the actual collaborative sounding. By pre-establishing which subcarriers are coherent across different APs and creating the mapping in advance, the system enables efficient parallel sounding execution without requiring complex real-time coordination during the sounding process itself.
Solution Approach 2:
The patent introduces a coherence mapping as an intermediary data structure that connects APs to their assigned coherent subcarriers. This mapping serves as a pre-computed lookup table that simplifies the coordination between multiple APs during collaborative sounding, reducing the complexity of real-time resource allocation while maintaining high sounding efficiency.
Data Source
AI summary
Techniques for efficient network probing are provided. Coherence data is received from a plurality of access points (APs), where the coherence data indicates, for each respective AP of the plurality of APs, coherence bandwidth for a plurality of subcarriers. A mapping is generated indicating, for each of the plurality of APs, sets of subcarriers that can be interchangeably sounded. Two or more APs of the plurality of APs that can jointly sound a first subcarrier of the plurality of subcarriers are then identified based on the mapping, and the first subcarrier is allocated to the identified two or more APs for future sounding.