This is because the dynamic time allocation scheme in DTSMS will cost some time to allocate time slots for all the nodes when the network topology or the sequence of transmission factors change.
Moreover, the throughput of DTSMS is 14.3% higher than that of TTS-MIMO [31] because the dynamic time allocation scheme increases the transmission chances of the packets with high link quality which decrease the retransmission times and improve the throughput of DTSMS.
It is a run-time allocation scheme that functions at the network nodes.
On the basis of the fundamental access scheme, an intuitive time allocation strategy of the idle period is periodic sensing and accessing strategy.
On the basis of fundamental access scheme, we will study optimal time allocation strategy of the idle period and compare the performance of optimal strategy and other strategies.
However, most of the existing time slot allocation schemes in ad hoc networks do not take the cross-layer information and the changes of network topologies [25, 26], which have the poor adaptability to network topology changes and cannot guarantee the QoS of the packets with high cross-layer transmission parameters.
In other words, the normalized slot level of nodes with high transmission parameters in DTSMS are lower than that in TTS-MIMO, because the dynamic time slot allocation scheme will allocate low slots for the nodes with high transmission parameters, which will efficiently decrease the delay of the nodes with high transmission parameters and is useful for improving the quality of service.
However, the constrains assumed by existing works in [18] that the transmission rate of each channel is identical and the time slot allocation scheme is fixed with half time to receive and the other half to transmit are not always applicable in terms of the time-varying channel condition in practical wireless network environment.
We implement dynamic time slot allocation scheme in DTSMS protocol to adjust the transmission time slots for all nodes according to the changes of network topologies and cross-layer information.
Moreover, we implement the dynamic time slot allocation scheme in DTSMS to guarantee the transmission efficiency of packets with high cross-layer transmission parameters, such as the packet priority, neighbor node density, or link quality.
As we can see in Fig. 14, the overhead of DTSMS is higher than that of TTS-MIMO because of the dynamic nature in dynamic time slot allocation scheme.
