Multiple Primary Channel Access with NAV-Aware Channel Coordination
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Solution Overview
Problem
Existing multiple primary channel access (MPC) STA operations in wireless communication networks face inefficiencies due to inadequate channel access mechanisms, leading to suboptimal resource utilization and interference among stations.
Innovation Solution
Implement enhanced channel access protocols that utilize multi-user request to send (MU-RTS) trigger frames and bandwidth signaling to manage simultaneous access across multiple channels, ensuring coordinated and efficient use of primary and secondary channels by stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple primary channel access is implemented without enhanced protocols, then stations can access multiple channels simultaneously, but interference increases and resource utilization becomes suboptimal
Solution Approach 1:
The patent applies preliminary action by implementing channel assessment and coordination procedures before stations access multiple primary channels. The AP performs bandwidth signaling and channel availability assessment in advance, and stations conduct clear channel assessment (CCA) and check network allocation vector (NAV) values before initiating transmissions. This preliminary coordination prevents interference by ensuring stations only access channels that are currently idle and appropriate for their use.
Solution Approach 2:
The patent implements feedback mechanisms where the AP continuously monitors channel conditions and provides bandwidth signaling to stations about which primary channels are available for access. Stations provide feedback through clear channel assessment results and NAV updates. This closed-loop feedback system enables dynamic adjustment of channel access decisions, optimizing resource utilization while preventing interference by informing stations about current channel states.
2Productivity
If traditional channel access mechanisms are used, then implementation is simpler, but resource utilization across multiple channels is suboptimal
Solution Approach 1:
The patent applies universality by designing a channel access mechanism that works across multiple primary channels with a unified coordination approach. The same CCA procedure, NAV checking mechanism, and bandwidth signaling protocol are applied universally across all primary channels, allowing stations to access any available channel using consistent rules. This multi-functional approach optimizes resource utilization across the entire channel set while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The patent applies segmentation by dividing the channel management function into distinct components: the AP performs bandwidth signaling and overall coordination, while individual stations perform local CCA and NAV checking. This segmentation allows the complex multi-channel access problem to be broken down into manageable independent tasks that can be executed by distributed entities, improving resource utilization without overwhelming system complexity.
3Speed
If stations access channels without coordinated protocols, then access is faster and more direct, but network performance and throughput decrease
Solution Approach 1:
The patent applies preliminary action by having stations perform quick CCA checks and NAV validations before channel access, and by having the AP pre-signal bandwidth availability. These preliminary actions are designed to be fast operations that do not significantly delay access while ensuring that stations only attempt to access channels that are currently appropriate, thereby maintaining both speed and network throughput.
Solution Approach 2:
The patent implements periodic action through continuous bandwidth signaling by the AP and periodic CCA checks by stations. The AP periodically updates stations about channel availability, and stations periodically reassess channel conditions before and during access. This periodic coordination maintains network performance by ensuring channel states are regularly verified without requiring constant communication that would slow down access.
Data Source
AI summary
A station (STA) receives a first frame via a first channel and sets a first network allocation vector (NAV) associated with the first channel to a non-zero value based on the first frame. The STA transmits a second frame on a channel comprising the first channel and a second channel, wherein at transmission of the second frame the STA ignores the non-zero value of the first NAV on condition that a second NAV associated with the second channel is zero.