Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 More
Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 !mso]> st1:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal" mso-tstyle-rowband-size:0 mso-tstyle-colband-size:0 mso-style-noshow:yes mso-style-priority:99 mso-style-qformat:yes mso-style-parent:"" mso-padding-alt:0cm 5.4pt 0cm 5.4pt mso-para-margin:0cm mso-para-margin-bottom:.0001pt mso-pagination:widow-orphan font-size:11.0pt font-family:"Calibri","sans-serif" mso-ascii-font-family:Calibri mso-ascii-theme-font:minor-latin mso-fareast-font-family:"Times New Roman" mso-fareast-theme-font:minor-fareast mso-hansi-font-family:Calibri mso-hansi-theme-font:minor-latin mso-bidi-font-family:Arial mso-bidi-theme-font:minor-bidi} Abstract The variety of services on IP networks and the need for network technology convergence have resulted in many access networks to adopt the IP technology. The Session Initiation Protocol (SIP) is an end to end application level protocol for establishing, terminating and modifying sessions and has experienced widespread use in IP networks due to its distinguished features such as being text based, independence from the underlying network, and more importantly supporting various types of mobility. In fact these features have lead SIP to be used as the core signaling protocol in the IP Multimedia Subsystem, which is the control plane proposed for next generation networks by the 3GPP community. Nevertheless, the performance of SIP servers when used by the millions of users of the next generation networks is not well established. In this paper we evaluate the performance of SIP servers using a test bed developed at the Iran University of Science & Technology. We consider eight different configurations for SIP server and also study the effect of using TCP and UDP as the transport protocol for SIP packets. We measure several parameters including call setup delay, call failure rate and SIP server throughput. Our results suggest that using SIP in large networks require using special techniques for balancing the load of SIP servers as well as mitigating temporary overloads.
Manuscript profile
Large number of processing cores integrated into a single chip have high growth rates. Networks on an optical chip are one of the simplest ways to solve the addressing problem between bulk interconnected networks. That's why high-performance, high-bandwidth multi-proces More
Large number of processing cores integrated into a single chip have high growth rates. Networks on an optical chip are one of the simplest ways to solve the addressing problem between bulk interconnected networks. That's why high-performance, high-bandwidth multi-processor chips will be needed in the future. Optical chip networks were introduced as a new generation of on-chip networks that overcome all the limitations of this type of network and have many advantages such as high communication bandwidth, low transmission delay. And power consumption is low. On the other hand, networks on optical chips have challenges, one of the most important of which is the routing of optical data in the optical layer, because how the path is selected affects the optical loss factor. In this paper, routing algorithms free from the impasse of adaptive rotational models, circuit switching and various traffic patterns to reduce light loss in the optical layer by considering a 5-port unobstructed router and two-dimensional grid or Mesh will be provided. Finally, we compare the simulation results with similar methods such as the XY-based algorithm and examine the improvements obtained.
Manuscript profile
