MMW Multi-Channel Access and Waveform Design for OBSS Interference
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Solution Overview
Problem
Existing millimeter wave (mmW) systems lack mechanisms for efficient multi-channel setup and waveform designs, leading to interference and inefficiencies in channel allocation, particularly in overlapping basic service sets (OBSS), which affects throughput and compatibility with legacy standards.
Innovation Solution
Implement mechanisms for multi-channel access and waveform designs in millimeter wave systems, including simultaneous transmission of non-overlapping single carrier waveforms to multiple stations, with an access point monitoring OBSS beacon frames for scheduling information and allocating service periods and contention-based access periods, and using channel bonding and aggregation to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-channel access mechanisms are implemented in mmW systems, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the available spectrum into multiple channels and implements separate access mechanisms for each channel. The access point divides service periods and contention-based access periods across different channels, allowing independent management and optimization of each channel while improving overall spectral efficiency.
Solution Approach 2:
The patent implements dynamic channel allocation where the access point can adjust channel assignments, service period durations, and contention-based access period configurations based on real-time network conditions, traffic demands, and interference levels, enabling adaptive optimization without fixed rigid structures.
2Object-affected harmful factors
If channel allocation optimization is performed in OBSS, then interference is reduced, but measurement precision requirements increase
Solution Approach 1:
The patent uses beacon frames as intermediary carriers to transmit scheduling information between access points in overlapping basic service sets. These beacon frames contain encoded service period and contention-based access period allocations that allow indirect coordination and interference mitigation without requiring direct high-precision measurements between competing access points.
Solution Approach 2:
The patent implements feedback mechanisms where access points monitor beacon frames from other access points in OBSS and adjust their own channel allocations, service periods, and contention-based access periods accordingly. This feedback loop enables adaptive interference reduction through iterative optimization based on observed network conditions.
3Productivity
If simultaneous multi-user transmissions are allowed, then throughput is improved, but loss of information increases due to interference
Solution Approach 1:
The patent segments simultaneous transmissions into different time-frequency resources by creating separate service periods and contention-based access periods on different channels. This segmentation allows multiple users to transmit simultaneously without interference by assigning them to distinct resource blocks, maintaining signal integrity while improving throughput.
Solution Approach 2:
The patent extends the resource allocation from single-channel time-division to multi-channel frequency-division with associated time periods. By adding the channel dimension to resource allocation, the system can support more simultaneous transmissions across multiple dimensions (frequency, time, and channel), increasing throughput while managing interference through spatial and spectral separation.
Data Source
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AI summary
Mechanisms may be used for multi-channel (MC) setup and access and waveform designs for millimeter wave (mmW) systems. An access point (AP) that is part of a basic service set (BSS) may provide multi-channel (MC) access to one or more stations (STAs) in the BSS. The AP may monitor for beacon frames transmitted by other access point/personal basic service set (PBSS) control point (AP/PCP) associated with overlapping basic service sets (OBSSs). The monitored beacon frames may include service period (SP) scheduling information for the OBSS. The AP may generate an allocations at least one SPs and/or contention based access periods (CBAPs) channels to be used in a beacon interval in consideration of the SP scheduling information for the OBSS. The AP may transmit a beacon frame STA(s) indicating the SP/CBAP allocations. Other mechanisms may include simultaneous transmission of multiple single carrier (SC) waveforms with non-overlapping waveforms to multiple STAs.