Narrowband IoT Range Extension via rTWT Service Periods
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Solution Overview
Problem
Existing wireless communication systems face challenges in extending the range and reducing interference for low-power narrowband IoT devices communicating with wideband access points, particularly in coordinating communication between different types of wireless devices.
Innovation Solution
The technical solutions utilize features of the IEEE 802.11 wireless standard, such as restricted target wake time service periods (rTWT SPs), clear-to-send-to-self (CTS2SELF) frames, and trigger frames, to schedule communication intervals and reduce collisions. Additionally, edge bandwidths outside standard 802.11 channels are used for reliable narrowband IoT communications, and mesh/repeater or client relay techniques are employed to extend the range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrowband IoT devices communicate with wideband access points using standard wideband channels, then compatibility with legacy devices is maintained, but communication range is limited and interference increases
Solution Approach 1:
The patent segments the communication process into distinct service periods: wideband service periods for legacy device communication and narrowband service periods for IoT device communication. This segmentation allows each type of device to operate in dedicated time slots, extending IoT range while maintaining wideband compatibility without interference
Solution Approach 2:
The patent implements periodic service periods alternating between wideband and narrowband communication modes. During narrowband service periods, the access point dedicates specific time intervals for IoT device communication, enabling extended range operations while periodically returning to wideband mode for legacy device compatibility
2Reliability
If service periods are established to pause wideband communications for narrowband IoT devices, then interference is reduced, but communication productivity decreases
Solution Approach 1:
The patent dynamically adjusts the duration and frequency of narrowband service periods based on network conditions and IoT device requirements. The access point can extend or shorten service periods and modify their occurrence rate, optimizing the balance between reducing interference for reliable IoT communication and maintaining overall network productivity
Solution Approach 2:
The patent changes communication parameters including service period duration, bandwidth allocation, and power levels dynamically. By adjusting these parameters based on traffic demands and device priorities, the system reduces interference during critical IoT transmissions while minimizing impact on overall communication throughput
3Reliability
If clear-to-send-to-self frames are transmitted to prevent collisions during service periods, then communication reliability improves, but device complexity increases
Solution Approach 1:
The patent employs clear-to-send-to-self (CTS2SELF) frames where the access point itself transmits the reservation signal to its own network. This self-service approach simplifies the mechanism by eliminating the need for complex coordination with individual stations, as the CTS2SELF frame inherently reserves the medium for the upcoming service period without requiring additional handshaking protocols
Data Source
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AI summary
The solutions can include devices, systems and methods for facilitating wireless communication of narrowband devices within a communication range of wideband access points. An access point (AP) can be configured to communicate with one or more stations using a wideband preamble and to communicate with a first one or more devices via narrowband channels. The AP can establish a service period (SP) with the one or more stations for which the one or more stations and the AP pause communications over the wideband channels. The AP can receive, during the SP, one or more protocol data units from the first one or more devices over the one or more narrowband channels without the wideband preamble. The AP can forward, during the SP, data from the one or more protocol data units to a second one or more devices over the one or more narrowband channels.