Adaptive Status Report with Congestion Control in NB-IoT

The Narrowband-Internet of Things (NB-IoT) is a new form of the internet of things, characterized by low energy consumption, low bandwidth consumption, wide coverage, and multiple-connectivity. Access to 50,000 terminals can be supported by a single NB-IoT base station. However, when network resources cannot meet the demands of a large number of devices at the same time, network congestion may be induced, reducing data transmission efficiency and throughput and increasing delay. The radio link control layer of the NB-IoT uses sliding windows, timers, and status reports to control data transmission and realize automatic repeat-request retransmission. This paper studies and improves the TCP Westwood (TCPW) congestion algorithm in a communication protocol and proposes an adaptive sliding window algorithm, Polling-TCPW, to optimize the status report mechanism in the RLC protocol stack. Simulation results indicate that the proposed algorithm can effectively increase the throughput and reduce the transmission delay of RLC and guarantee system stability.

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