Dynamic Channel Bonding in Wireless LANs
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Solution Overview
Problem
In wireless local area networks, especially in dense environments with legacy devices, channel bonding for bandwidth aggregation is inefficient due to challenges in finding contiguous free bandwidth, and dynamic changes in bandwidth availability complicate operations.
Innovation Solution
The solution involves a method and apparatus for dynamic channel bonding and access procedures that allow for the allocation of multiple contiguous or non-contiguous channels, sensed as free, irrespective of continuity, using modified RTS and CTS mechanisms with embedded channel bandwidth indicators, enabling efficient bandwidth utilization across IEEE 802.11 systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If contiguous channel bonding is used to aggregate bandwidth, then transmission bandwidth is improved, but availability of free contiguous channels deteriorates in dense environments with legacy devices
Solution Approach 1:
The patent segments the channel aggregation process into two independent phases: (1) primary channel access through CSMA/RTS-CTS, and (2) secondary channel bonding through additional RTS-CTS exchanges. This segmentation allows the system to aggregate non-contiguous channels from different frequency ranges, transforming the problem from finding one large contiguous block to assembling multiple smaller segments, thereby improving channel availability in dense environments.
Solution Approach 2:
The patent implements dynamic channel bonding where the final aggregated bandwidth is determined through iterative RTS-CTS exchanges rather than being fixed in advance. The transmitter requests additional secondary channels dynamically based on current channel conditions, and the receiver confirms availability through CTS responses. This dynamic approach adapts to changing bandwidth availability in real-time, improving versatility in dense environments.
2Device complexity
If fixed channel bonding procedures are used, then protocol simplicity is improved, but adaptability to dynamic bandwidth availability deteriorates
Solution Approach 1:
The patent transforms the static channel bonding procedure into a dynamic one by introducing iterative RTS-CTS exchanges. The initial RTS specifies a requested bandwidth, and the CTS response confirms the actually available bandwidth. If secondary channels become available during transmission, additional RTS-CTS exchanges can negotiate and activate them. This maintains protocol simplicity through standardized frame formats while achieving adaptability through multiple negotiation rounds.
Solution Approach 2:
The patent incorporates feedback mechanisms where the receiver's CTS frame provides information about actual channel availability and bandwidth conditions. This feedback allows the transmitter to adjust its transmission strategy, negotiate for additional secondary channels, and adapt to dynamic bandwidth conditions. The feedback loop maintains protocol simplicity by using existing CTS frame structures while enabling adaptive behavior.
3Adaptability or versatility
If channel bonding negotiates only predefined bandwidths (40MHz, 80MHz, 160MHz), then compatibility with legacy systems is improved, but bandwidth utilization efficiency deteriorates when exact contiguous blocks are unavailable
Solution Approach 1:
The patent segments the bandwidth negotiation into primary channel allocation (maintaining legacy compatibility) and secondary channel aggregation (improving efficiency). The primary channel uses traditional CSMA/RTS-CTS for legacy compatibility, while secondary channels are added through additional RTS-CTS exchanges that can combine non-contiguous frequency blocks. This segmentation enables utilization of scattered spectrum resources that don't fit traditional contiguous bonding patterns.
Solution Approach 2:
The patent changes the bandwidth parameter representation from fixed predefined values (40, 80, 160 MHz) to flexible combinations of primary and secondary channels with arbitrary frequency allocations. The RTS and CTS frames carry bandwidth information that can specify any combination of channels, allowing the system to negotiate exact available bandwidth rather than being constrained to standard sizes, thereby improving utilization efficiency while maintaining legacy compatibility through the primary channel interface.
Data Source
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AI summary
A method of establishing a data transmission bandwidth between a transmitting node and a receiving node is provided. The method includes sending a request to send (RTS) message from a transmitting node to a receiving node, the RTS message indicating a data transmission bandwidth to be considered for use in subsequent data transmission and establishing a negotiated data transmission bandwidth comprising multiple channels, wherein each channel comprises a 20MHz bandwidth, and wherein the multiple channels are at least one of contiguous and non-contiguous in frequency.