Thực hiện chất lượng dịch vụ trong các mạng IP (P2)

... is provided by ETSI’s IP telephony project TIPHON. Currently they cover only telephony. The end-to-end service quality characteri- zations used by TIPHON are as follow [TIPHON-2]: • overall transmission ... a VoIP call with application sharing, for example, the following distinct service event types can be enumerated: • connection set-up signalling (e.g., H.323 or SIP); • transmission of Vo...

Ngày tải lên: 24/10/2013, 16:15

... computer (PC), and xDSL Customer Premise Equipment (CPE). The mere existence of different kinds of equip- ment is no bad thing as such; it is often good to use equipment specifically designed for one ... network, allowing for cost-efficient design of networking equipment. IP is a good convergence layer in the sense that it can be run over multiple link layer technologies, including ATM. On th...

Ngày tải lên: 24/10/2013, 16:15

... version of IPv4, IPv6 has a larger address space, but is not yet widely deployed. IPv6-based research network 6Bone has been operating for many years now, and IPv6 has also been 3.7 ROUTING IN IP NETWORKS ... delivery IPv6 packets require IPv6-capable routers using routing protocols, which can handle IPv6. It is obvious that the whole Internet will not be upgraded into IPv6 overnight. Sub-...

Ngày tải lên: 28/10/2013, 23:15

... Service Quality in IP Networks Vilho R ¨ ais ¨ anen  2003 John Wiley & Sons, Ltd ISBN: 0-470-84793-X 106 TRAFFIC ENGINEERING FOR MULTI-SERVICE IP NETWORKS the effect of multiple network elements ... subject to standardization at least in IETF [RFC1757, RFC2021, RFC3432] and ETSI’s IP telephony project TIPHON [TIPHON-5]. Passive measurements do not add further traffic into the net- w...

Ngày tải lên: 28/10/2013, 23:15

... the IP telephony project TIPHON, which has devised a reference models for IP telephony, in which service providers can be separated from trans- port operators [TIPHON-3]. The model pertains to IP ... service quality descriptors, or with predefined service quality support classes as in the TIPHON model. Additionally, the TCP /IP implementation of the operating system of the end user IP...

Ngày tải lên: 07/11/2013, 20:15

... briefly. For concreteness, IP telephony spanning multiple transport domains is used as an example. SLA-based interworking means that the transport operators have mutual SLAs for IP transport support ... system and net- work drivers is paramount for VoIP, covering the areas of Operat- ing System (OS) process scheduling, interrupt handling, TCP /IP stack implementation, and device driver su...

Ngày tải lên: 07/11/2013, 20:15

... signalling per- formance of a SIP proxy by using a SIP client, which is able to time the individual signalling events. In this case, provided that the endpoints (client and SIP proxy) are operating ... measurements, but may be expressly 7.3 TRAFFIC CONTROL 219 IP domain ER ER Traffic engineering measurements IP domain ER ER Testing of aggregate performance SIP proxy Terminal Testing of si...

Ngày tải lên: 07/11/2013, 20:15

... access domain, and egress policing, when used, can be based on network destination. IP domain IP domain IP domain IP domain IP domain Endpoint Endpoint QA QA QA QA Figure 8.5 Funnels in Schel ´ en’s scheme 8.2 ... dynamically controlling service quality in IP net- works is our next topic. There are two primary uses for such methods: dynamic control of resources within an IP doma...

Ngày tải lên: 15/12/2013, 05:15

... quality support User IP layer Application Radio tunneling RAB Link Radio tunneling RAB Link GTP IP Link GTP IP Link GTP IP Link GTP IP Link Link User IP layer User IP layer Terminal IP base transceiver station ... QUALITY SUPPORT IN AN IP- BASED CELLULAR RAN Application PDP context Managed mapping IP transport bearer Radio access bearer Figure 9.6 Service mapping for user...

Ngày tải lên: 15/12/2013, 05:15

... Protocol (IP) . IP- based applications have been in wide-scale use since the development of Transfer Control Protocol (TCP) in the 1980s. The application programming interface (API) of TCP /IP has ... real-time services requires that new technologies be added to basic IP. The most demanding ser- vices such as Voice over IP (VoIP)and streamed multimedia typically 10.2 DIFFSERV 301 consis...

Ngày tải lên: 15/12/2013, 05:15