Thực hiện chất lượng dịch vụ trong các mạng IP (P1)

... Internet Protocol (IP) emerged from the period of rapid technological development during the late 1990s as the win- ning candidate. Converged IP- based delivery of content service allows IP to be used ... 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....

Ngày tải lên: 24/10/2013, 16:15

... 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

... 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 ... 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,...

Ngày tải lên: 24/10/2013, 16:15

... domains can be joined into a logical IPv6 backbone by tunnelling traffic between IPv6 domains through IPv4 networks. The tunnelling approach allows one to use non-modified IP routing protocols, but requires ... Point (DSCP) into a six-bit field in IP packet header called the DS field. DS field is present in both IPv4 and in IPv6 headers, superseding the pre- viously reserved IP header field o...

Ngày tải lên: 28/10/2013, 23:15

... 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 defined measurement ... 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- wo...

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 ... multi-service IP network. ETSI EP TIPHON, Internet2/QBone, and ETSI 3GPP service quality support models were reviewed, as well as the concept of utility- based allocation of resources. TI...

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 ... cause unpleasant surprises with respect to audio quality on normal PC hardware. The ETSI EP TIPHON VoIP terminal classification, taking into account the effects of terminal hardware, is one...

Ngày tải lên: 07/11/2013, 20:15

... packets. Defined by IPPM working group. Periodic streams Defined by IPPM working group. ICMP ping Results may differ from application performance. Service emulation HTTP query Emulation of VoIP media stream 226 ... function efDV 5minutes milliseconds of IPDV at the 50 th percentile 5minutes 5minutes milliseconds of IPDV at the 90 th percentile 5minutes 5minutes milliseconds of IPDV at the 99.5...

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 8.1 ... bandwidth broker signalling is needed is the ETSI EP TIPHON model in which end-to-end service quality allocation is performed on the service level [TIPHON-3]. In this case...

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 ... motivation for using IP- based transport in cellular radio access network. Next, IP RAN transport architecture is explained. After that, an implementation of serv...

Ngày tải lên: 15/12/2013, 05:15