Research Article
[Retracted] An XGB-Based Reliable Transmission Method in the mMTC Scenarios
Table 1
Summary of algorithm variables.
| Symbol | Description |
| | The time between the message being sent and the corresponding ACK being received. | | The approximate mean value of historical statistics RTT. | | The smooth factor to SRTT. It is 1/8 on this study. | | The time interval at which data are sent again. | | The smooth factor to . It is 1/4 on this study. | | First RTT measurement value. | | The error between the calculated SRTT of the last data transmission and the real measured RTT. | | The deviation correction between SRTT and real RTT. | | A fixed coefficient in standard TCP is 4. | | The minimum time interval of the timer. It is 100 ms on this study. | | The rate of change in SRTT is 1/3. | | The basic time-out value is 2000 ms in general. | | The random value is between 1.0 and 1.5 in general. | | The max number of retransmission is 4 in general. | | The max time of RTO. | | The rate of change in . |
|
|