Abstract:
Method and apparatus for controlling the routing of data packets in an IP network (200). A DNS system (202) stores a packet admission policy configured for a first end-host (B) that dictates conditions for allowing other end-hosts to get across data packets to the first end-host or not. A routing voucher is defined which is required for routing data packets to the first end-host. The routing voucher is distributed to routers (R) in the IP network. When an address query is received at the DNS system (202) from a second end-host, the voucher is supplied to the second end-host if the configured policy allows the second end-host to convey data packets. Otherwise, the voucher is not supplied. If allowed, the second end-host will add the routing voucher to any data packets directed to the first end-host. When a valid routing voucher is present in a packet at a router (204) in the network, the packet will be forwarded to the next router in the IP network. The router will otherwise discard the packet.
Abstract:
Disclosed herein is a method, a serving node and a mobility node for relocating the mobility anchor for a mobile terminal 215a in a wireless communication system 200. The relocation comprises a request for redirecting a first bearer B-old for the mobile terminal 215a between the serving node 212b and a first mobility anchor 214a so as to create a new substantially identical second bearer B-new between the serving node 212b and a second mobility anchor 214b. In addition, the relocation comprises a transmission of a request to the first mobility anchor 214a for deleting the first bearer B-old and a transmission of a request to the second mobility anchor 214b for establishing the second bearer B-new.
Abstract:
Mobility between access domains in an Internet Protocol (IP) network can be supported by introducing a so-called Mobility Manager (MM) that maintains (Sl) a database of currently attached devices and their current access domain location. The mobility manager may then detect (S2), for a device registered in the database, a change of access domain from a first access domain to a second access domain by monitoring connection maintenance signaling related to the considered device. The mobility manager should at least obtain an indication of such a change of access domain. In response to a detected change of access domain, the mobility manager arranges (S3) for a reconfiguration of the network to forward traffic destined to an IP address of the device in the first access domain to a new location in the second access domain. In this way, the mobility manager allows the device to keep its IP address when moving between access domains.
Abstract:
A technique of operating a network node of a multicast communication network comprising a plurality of network nodes which are interconnected with each other by communication links is provided, wherein the network node is associate with a common source network node. A method implementation of the technique comprises: determining a first path which connects the network node to the common source network node along a primary network tree, and determining a second path which connects the network node to the common source network node along a secondary network tree, wherein the first path and the second path show redundancy with respect to each other; receiving, at the network node, multicast data from the common source network node via the first path; triggering, by the network node, reception of multicast data from the common source network node via the second path if the network node detects a failure of the first path (e.g., determines that no multicast data is received via the first path).
Abstract:
Un método para su uso en un Cliente de Cálculo de Ruta (24) de un nodo en una red, comprendiendo el método:enviar un mensaje de solicitud (52) a un Elemento de Cálculo de Ruta (28) de la red para el cálculo de unaruta; Recibir un mensaje de respuesta (54) desde el Elemento de Cálculo de Ruta que comprende informaciónidentificativa de una ruta calculada; e Intentar (58) el establecimiento de una conexión basándose en la ruta calculada; caracterizado porque el método comprende también: recibir desde el Elemento de Cálculo de Ruta una solicitud de información de retorno acerca de un resultadodel intento de establecimiento de la conexión; y reportar (64) al Elemento de Cálculo de Ruta el resultado del intento de establecimiento de la conexión.
Abstract:
A method of managing quality of service in an IP network is provided. The method comprises identifying, at an egress edge node of the network, that congestion is present in one or more routers within the network. Data flows for termination to remove the congestion are selected. At least one flow termination notification is sent from the egress edge node to an ingress edge node of the network, the at least one flow termination notification identifying the selected data flows. Low priority flows from the selected data flows are terminated at the ingress edge node immediately. High priority flows are terminated only if congestion is still present after a predetermined delay period. The delay may be applied in the ingress edge node or the egress edge node. The invention also provides a method for admitting low priority flows into the network only if the network has resources available for a number of high priority flows above a dynamically determined threshold.
Abstract:
An egress node is proposed for a network domain that comprises at least o ne ingress node for receiving and routing data units belonging to a pluralit y of flows into said network domain, a plurality of interior routers for rou ting said data units through said network domain, and said egress node(s). O ne or more of the interior routers is arranged to detect whether it is subje ct to a congestion condition and to congestion mark routed data units if it is subject to said congestion condition. The egress node comprises a control element arranged for performing a congestion handling function that compris es a part for detecting the presence of congestion marked data units arrivin g at said edge node, and a part for reacting to the detection of the presenc e of congestion marked data units by invoking a congestion control process. The congestion control comprises sending to said ingress node an instruction for terminating one or more flows to thereby reduce a traffic load, waiting a predetermined period of time and then determining whether congestion mark ed data units are still arriving at said edge node, and if congestion marked data units are still arriving, repeating the sending and waiting steps.