Trigger Frame Recovery in WLANs
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently managing bandwidth and response times due to the coexistence of newer and legacy devices, which can lead to resource contention and suboptimal communication protocols, affecting overall network performance.
Innovation Solution
Implementing a method for trigger frame recovery in WLANs that includes a master station transmitting a trigger frame with a network allocation vector (NAV) duration and schedule, allowing HE stations to operate in a non-contention based multiple access technique during a designated control period, while legacy devices are excluded, and employing techniques like OFDMA and MU-MIMO for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If newer protocols (IEEE 802.11ax) are implemented for improved efficiency, then bandwidth utilization and response times are enhanced, but compatibility with legacy devices is compromised
Solution Approach 1:
The patent segments the wireless network into two distinct operational modes: a first set of stations operating under legacy IEEE 802.11 protocols and a second set of high-efficiency stations operating under IEEE 802.11ax protocols. This segmentation allows each group to utilize optimized protocols for their specific requirements while maintaining overall network compatibility through the access point's ability to handle both modes simultaneously.
Solution Approach 2:
The access point serves as an intermediary that translates and coordinates between legacy protocol stations and high-efficiency protocol stations. It manages the trigger frame exchanges and resource allocation, enabling newer devices to benefit from advanced features like OFDMA while legacy devices continue to operate using traditional contention-based methods, thus bridging the compatibility gap.
2Reliability
If trigger frame retransmission is performed after timeout, then reliable communication is ensured, but network latency increases
Solution Approach 1:
The access point performs preliminary actions by setting a network allocation vector (NAV) duration in the trigger frame that accurately reflects the expected response time. This preliminary timing configuration allows receiving stations to know in advance when to expect responses, reducing the need for timeout-based retransmissions and thereby minimizing latency while maintaining reliability.
Solution Approach 2:
The system implements feedback mechanisms where the access point monitors whether response frames are received within the expected time window. If responses are not received, the access point initiates retransmission of the trigger frame. This feedback loop ensures reliable communication while the initial timing settings strive to minimize the frequency of retransmissions and associated latency.
Data Source
AI summary
Methods, computer readable media, and wireless apparatuses are disclosed for trigger frame recovery. An apparatus of a wireless device is disclosed. The apparatus comprising processing circuitry configured to: encode a trigger frame comprising a resource allocation for one or more stations, where the trigger frame comprises a network allocation vector (NAV) duration. The processing circuitry may be further configured to configure the wireless device to transmit the trigger frame to the one or more stations. The processing circuitry may be further configured to configure the wireless device to contend for the wireless medium a first time, encode a retransmission of the trigger frame, and configure the wireless device to transmit the retransmission of the trigger frame to the one or more stations, if a frame is not received from the one or more stations in response to the trigger frame before a trigger frame timeout duration.