QoS Aware Multi-Path Routing using Link Scheduling Algorithm
Authors: Palle Satyasrikanth , Shankar Shiva 
Published: December 2019

Objective:
The demand for Cellular based multimedia services is growing day by day,
in order to fulfill such demand the present day cellular networks needs to be upgraded to support
excessive capacity calls along with high data accessibility. Analysis of traffic and huge network
size could become very challenging issue for the network operators for scheduling the available
bandwidth between different users. In the proposed work a novel QoS Aware Multi Path scheduling
algorithm for smooth CAC in wireless mobile networks. The performance of the proposed algorithm
is assessed and compared with existing scheduling algorithms. The simulation results
show that the proposed algorithm outperforms existing CAC algorithms in terms of throughput
and delay. The CAC algorithm with scheduling increases end-to-end throughput and decreases
end-to-end delay.

Methods:
The key idea to implement the proposed research work is to adopt spatial reuse concept
of wireless sensor networks to mobile cellular networks. Spatial reusability enhances channel reuse
when the node pairs are far away and distant. When Src and node b are communicating with
each other, the other nodes in the discovered path should be idle without utilizing the channel. Instead
the other nodes are able to communicate parallelly the end-to-end throughput can be improved
with acceptable delay. Incorporating link scheduling algorithms to this key concept further
enhances the end-to-end throughput with in the turnaround time. So, in this research work we
have applied spatial reuse concept along with link scheduling algorithm to enhance end-to-end
throughput with in turnaround time. The proposed algorithm not only ensures that a connection
gets the required bandwidth at each mobile node on its way by scheduling required slots to meet
the QoS requirements. By considering the bandwidth requirement of the mobile connections, the
CAC module at the BS not only considers the bandwidth requirement but also conforming the
constrains of system dealy and jitter are met.

Result:
To verify the feasibility and effectiveness of our proposed work, with respect to scheduling
the simulation results clearly shows the throughput improvement with Call Admission Control.
The number of dropped calls is significantly less and successful calls are more with CAC.
The percentage of dropped calls is reduced by 9 % and successful calls are improved by 91%. The
simulation is also conducted on time constraint and ratio of dropped calls are shown. The total
time taken to forward the packets and the ration of dropped calls is less when compared to non
CAC. On a whole the CAC with scheduling algorithms out performs existing scheduling algorithms.

Conclusion:
In this research work we have proposed a novel QoS aware scheduling algorithm that
provides QoS in Wireless Cellular Networks using Call Admission Control (CAC). The simulation
results show that the end-to-end throughput has been increased by 91% when CAC is used.
The proposed algorithm is also compared with existing link scheduling algorithms. The results reveal
that CAC with scheduling algorithm can be used in Mobile Cellular Networks in order to reduce
packet drop ratio. The algorithm is also used to send the packets within acceptable delay.