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Area of Science:

  • Computer Science
  • Electrical Engineering
  • Telecommunications

Background:

  • The proliferation of Internet of Things (IoT) services necessitates massive connectivity solutions.
  • IoT devices, often battery-powered, require reduced power consumption during random access to extend operational lifetime.
  • Devices with poor channel conditions face increased collisions due to low transmission rates and long packet repetitions, impacting system longevity.

Purpose of the Study:

  • To propose novel schemes for reducing collision probability in IoT systems, particularly for devices with poor channel conditions.
  • To enable IoT devices to share resources efficiently without group-based resource division.
  • To enhance the overall lifetime and performance of IoT systems.

Main Methods:

  • Two schemes are proposed: one delays responses from bad-channel devices to mitigate interference.
  • The second scheme reverses the order of response checking and random backoff for retransmission decisions.
  • Both methods aim to reduce collisions without segmenting resources by device groups.

Main Results:

  • The proposed schemes effectively reduce collision probability for devices with poor channels.
  • Interference is minimized, particularly in the first proposed method by delaying responses.
  • The second method optimizes retransmission strategies by performing random backoff before response checking.

Conclusions:

  • The developed schemes enhance the lifetime of IoT systems by lowering collision risks for bad-channel devices.
  • Performance degradation for other IoT devices is avoided.
  • Efficient resource utilization is achieved, supporting massive IoT connectivity.