Duplex Medium Access Control for Simultaneous WLAN Data Throughput
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Solution Overview
Problem
Existing 802.11 standards for WLANs limit data throughput due to half-duplex transmission schemes, where downlink and uplink transmissions cannot occur simultaneously, leading to inefficiencies in serving multiple client stations.
Innovation Solution
Implementing a method for duplex medium access control in WLANs, where a trigger frame initiates simultaneous uplink and downlink data packet transmissions, with acknowledgement messages exchanged bidirectionally, and subchannels allocated for each client station to support duplex operation, allowing for concurrent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If half-duplex transmission scheme is used in existing 802.11 standards, then noise cancellation difficulty is avoided, but data throughput is limited due to sequential downlink and uplink transmissions
Solution Approach 1:
The patent segments the transmission medium into multiple independent subchannels (frequency resources) that can operate simultaneously in different directions. Downlink and uplink transmissions are separated onto different subchannels, allowing parallel operations without interference, thus resolving the contradiction between throughput improvement and noise cancellation complexity.
Solution Approach 2:
The patent transitions from a single-channel sequential transmission model to a multi-subchannel parallel transmission model by adding the frequency dimension. This dimensional expansion allows simultaneous downlink and uplink transmissions to occur without conflicting in the time domain, thereby increasing throughput while avoiding noise cancellation issues.
2Productivity
If simultaneous downlink and uplink transmissions are enabled, then network efficiency is improved, but collision between transmissions may occur
Solution Approach 1:
The transmission medium is segmented into multiple orthogonal subchannels, each capable of independent simultaneous transmission. By allocating different subchannels to downlink and uplink transmissions, the patent eliminates collision risk while maintaining high network efficiency through parallel operations.
Solution Approach 2:
Different subchannels are assigned with specific transmission directions (downlink or uplink) based on local quality requirements. Each subchannel is optimized for its designated direction, allowing simultaneous transmissions without interference while maintaining high overall network efficiency.
3Productivity
If multi-user operation is implemented with duplex MAC, then data throughput is enhanced, but transmission coordination complexity increases
Solution Approach 1:
The patent segments both the transmission medium into subchannels and the user access into triggered uplink transmissions. This segmentation allows straightforward coordination where the access point triggers specific users to transmit on specific subchannels, simplifying multi-user duplex coordination while enhancing throughput.
Solution Approach 2:
The patent implements feedback mechanisms where the access point sends trigger frames to initiate uplink transmissions from specific client stations. This feedback-based coordination simplifies multi-user duplex operation by allowing the access point to control and schedule simultaneous transmissions, reducing coordination complexity while maintaining high throughput.
Data Source
AI summary
Embodiments described herein provide a method for establishing multi-user operation with duplex medium access control in a wireless local area network. Specifically, a trigger frame is transmitted to one or more client stations in a wireless local area network. In response to transmitting the trigger frame, one or more uplink data packets are received from the one or more client stations. It is then determined whether the one or more client stations support duplex operation. A downlink data packet configured in a multi-user data format is transmitted to at least one destined client station that supports duplex operation while simultaneously receiving the one or more uplink data packets from the one or more client stations.