Thực hiện chất lượng dịch vụ trong các mạng IP (P4)

... behavioural aggregate of DiffServ, over multiple IP hops. Thus, they include 106 TRAFFIC ENGINEERING FOR MULTI-SERVICE IP NETWORKS the effect of multiple network elements as a part of the measurement ... subject to standardization in IETF’s IP Per- formance Metrics working group (IPPM WG), ITU-T [I380], and ETSI [TIPHON-5]. To give an example of IETF work, the IPPM working group has defi...

Ngày tải lên: 28/10/2013, 23:15

... 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

... Draft IP QoS classes  International Telecommunication Union QoS Class Applications 0 Real-time, jitter-sensitive, high interaction (VoIP, VTC) 1 Real-time, jitter-sensitive, interactive (VoIP, ... 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 VoIP media...

Ngày tải lên: 24/10/2013, 16:15

... OSI model, IP operates on layer 3, providing per-packet routing for PDUs – IP packets – based on IP destina- tion address. Two versions of IP exist, IPv4 having 32-bit address fields and IPv6 having ... example. IPv6 brings with it the possibility of identifying a flow using the flow label field in the IPv6 header [RFC2460]. According to the latest proposal, an IPv6 flow is uniquely identi...

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