SDMA Wireless Access Point Spatial Steering and Acknowledgement Scheduling
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Solution Overview
Problem
Wireless communication systems, particularly in WLANs, face challenges in managing acknowledgments from multiple devices efficiently, leading to potential interference and reduced throughput due to the lack of effective mechanisms for coordinating acknowledgement responses across spatially separated channels.
Innovation Solution
The system employs spatially steered signals and response scheduling mechanisms to concurrently transmit data and control acknowledgments, including selective transmission of third signals to reschedule responses based on missed acknowledgments, ensuring efficient use of wireless channels and preventing interference from non-participating devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatially steered signals are used to concurrently transmit data to multiple wireless communication devices, then network throughput is improved, but coordination of acknowledgement responses becomes complex and may cause interference
Solution Approach 1:
The acknowledgement period is divided into multiple slots, with each slot assigned to a specific wireless communication device. This segmentation allows devices to transmit acknowledgements sequentially without interfering with each other, while still enabling concurrent data transmission to multiple devices during the same time period.
Solution Approach 2:
The system transmits signalling information to wireless communication devices before the acknowledgement period, assigning specific slots for each device's acknowledgement transmission. This preliminary scheduling prevents coordination complexity during actual data transmission by establishing the acknowledgement protocol in advance.
2Loss of time
If acknowledgement responses are transmitted concurrently to multiple devices, then response time is reduced, but transmission collisions occur and reliability decreases
Solution Approach 1:
The acknowledgement transmission opportunity is segmented into time slots assigned to individual devices. This ensures that each device transmits its acknowledgement without collision, maintaining reliability while minimizing total response time through parallel processing of multiple acknowledgements across different slots.
Solution Approach 2:
The access point acts as an intermediary that coordinates and schedules acknowledgement transmissions from multiple devices. It manages the timing and sequencing of acknowledgements to prevent collisions while maintaining efficient response times, mediating between the concurrent data transmission and the sequential acknowledgement requirements.
3Reliability
If the access point monitors for acknowledgements from all devices, then reliability is improved, but processing complexity and overhead increase
Solution Approach 1:
The monitoring process is segmented by device, with the access point tracking acknowledgements for each wireless communication device in separate time slots. This segmentation allows reliable monitoring of all devices while reducing processing complexity through structured, sequential monitoring rather than simultaneous processing of all devices.
Solution Approach 2:
The access point uses periodic monitoring during designated time slots for each device's acknowledgement transmission. This periodic action pattern allows reliable detection of missing acknowledgements while managing processing complexity through regular, predictable monitoring cycles rather than continuous complex analysis.
4Reliability
If third signals are transmitted to reschedule responses based on missed acknowledgments, then reliability is improved, but transmission overhead increases
Solution Approach 1:
The access point transmits third signals containing feedback information to reschedule acknowledgements from devices that did not transmit expected acknowledgements. This feedback mechanism improves reliability by ensuring all devices are accounted for, while limiting overhead by only activating rescheduling when necessary rather than continuously monitoring and transmitting.
Data Source
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AI summary
The present disclosure includes systems and techniques relating to wireless communications. A described system, for example, includes a device configured to transmit signals, in a frequency band, to the wireless communication devices. The signals can include spatially steered first signals that concurrently provide data to the wireless communication devices. The signals can include one or more second signals to the wireless communication devices to control transmission of responses from the wireless communication devices in the frequency band. The device can monitor for the responses in the frequency band. The device can control, based on a lack of reception of an expected response, a transmission of a third signal in the frequency band to prevent a transmission from another wireless communication device different than the wireless communication devices. The third signal can include information to reschedule a transmission of a response from a wireless communication device.