Wireless Channel Bandwidth Negotiation for Collision Avoidance
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Solution Overview
Problem
In wireless network communication, especially in WLAN systems with large bandwidth channels, the efficiency of data transmission is hindered by collisions between hidden stations and overlapping Basic Service Sets (BSSs), leading to reduced effective bandwidth utilization.
Innovation Solution
A method for channel data transmission where transmitting and receiving stations negotiate and determine the channel bandwidth through radio frame exchanges, acquiring information about available channels to select the optimal bandwidth for data transmission, using modes such as selecting basic or channelization bandwidths, and employing backoff contention to avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple wireless STAs share a wireless channel using traditional channel access mechanisms, then channel utilization is achieved, but hidden STAs cause collisions and reduce transmission reliability
Solution Approach 1:
The patent segments the wireless channel into multiple 20MHz sub-channels within a 160MHz bandwidth. Each sub-channel can be independently accessed and negotiated, allowing stations to transmit on available sub-channels while avoiding collisions on occupied ones. This segmentation enables parallel transmissions and improves overall channel utilization while maintaining reliability through selective channel access.
Solution Approach 2:
The patent implements dynamic channel bandwidth negotiation where the channel width is not fixed but adaptively determined through RTS/CTS exchange. Stations can negotiate to use 20MHz, 40MHz, 80MHz, or 160MHz channels based on current channel conditions and availability. This dynamic adjustment allows the system to optimize between reliability (using narrower, less contested channels) and productivity (using wider channels when available).
2Adaptability or versatility
If traditional 20MHz channel bandwidth is used, then compatibility with existing systems is maintained, but effective bandwidth utilization is limited
Solution Approach 1:
The patent makes the channel access mechanism universal by supporting multiple channel bandwidths (20MHz, 40MHz, 80MHz, 160MHz) within a single system. The RTS/CTS negotiation protocol can accommodate different bandwidth requirements, allowing the system to function effectively whether stations support only traditional 20MHz channels or can utilize wider 160MHz channels. This multi-functionality enables both legacy compatibility and high-performance operation.
Solution Approach 2:
The patent changes the channel bandwidth parameter dynamically based on negotiation outcomes. Instead of being fixed at 20MHz, the channel width can be adjusted to 40MHz, 80MHz, or 160MHz when conditions permit and both stations support the wider bandwidth. This parameter change allows the system to achieve higher bandwidth utilization while maintaining compatibility through fallback to narrower channels.
3Speed
If large bandwidth channels of 160MHz are used, then data transmission rate is improved, but collisions between overlapping BSSs increase
Solution Approach 1:
The patent segments the 160MHz channel into multiple 20MHz sub-channels that can be independently negotiated and accessed. When a 160MHz channel is detected to be occupied or contested, stations can fall back to using only the available 20MHz sub-channels. This segmentation allows the system to maintain high data rates on 160MHz when possible while avoiding collisions by using narrower channels when necessary.
Solution Approach 2:
The patent implements dynamic adjustment of channel bandwidth based on real-time channel conditions and negotiation outcomes. The channel width is not statically assigned but adaptively determined through RTS/CTS exchange, allowing stations to switch between 20MHz, 40MHz, 80MHz, and 160MHz operations. This dynamics enables the system to optimize data transmission rate when 160MHz is available while maintaining reliability by using narrower channels when collision risk is high.
Data Source
AI summary
The present invention discloses a method and system for channel data transmission in a wireless network. The method includes: after a transmitting station and a receiving station determine a channel bandwidth to use for data transmission by interaction and negotiation, the transmitting station transmitting data to the receiving station with the determined channel bandwidth. The present invention further discloses a transmitting station. The present invention can solve the existing collision problem caused by contention for channels between the hidden stations and the current transmission stations, and thus can take full advantage of the effective transmission bandwidth in the large bandwidth system of a wireless network and increase the frequency spectrum utilization of large bandwidth, and at the same time ensure the backward compatibility with the large bandwidth system and its co-existence with conventional systems.