Furthermore, without a proper queueing and scheduling scheme, the adoption of Semi-TCP in the joint scheme will intensify contention in the wireless channel, since it sends the TCP data greedily as long as the buffer queue in the link layer is available.
In Figures 5, 6 and 7, the curves show the deterministic worst-case length/delay/effective bandwidth in the buffer queue of a sensor node, respectively.
There exists a linear relationship between the upper bound on Q and the evolution time t and the same slopes of the all lines are -9.642 × 104. Figure 6 shows the impact of the service rate R and the latency T on the upper bounds on buffer queue delay D in a sensor node.
The proposed scheme can make the buffer queue level in bottleneck node stabilized on a setpoint quickly and the link bandwidth shared weighted-fairly.
Common priority FIFO buffer, high-priority FIFO buffer queue, and semi-global FIFO buffer queue are a reasonable distribution.
In queue-based protocols, the controller objective is to drive the buffer queue length to a certain target queue length; in the proposed scheme, model references (MRs) are used to address the problem of adapting the target queue length to the statistical characteristics of the traffic.
We see a straightforward dependency: the upper bound on D is smaller for larger service rate R; it is smaller for smaller latency T. Figure 6 The upper bounds on buffer queue delay (UBBQD) D (in s) of a sensor node: (a) D as a function of the service rate R (in Kbps) for T = 1; (b) D as a function of the latency T (in s) for R = 100.
In the latter stage (flow is low), packets that accumulated in buffer queue start to be transmitted, so the energy consumption continues to increase.
The buffer size of each vehicle is set to be infinite, and the packets in the buffer queue are sorted by decreasing residual time to expire.
The M-LWDF is used to improve QoS of different flows by defining a probability function that represents the urgency for data transmission corresponding to the time spent in the buffer queue.
