Telefonaktiebolaget Lm Ericsson (Publ)

Nortel Networks Corporation

Kapsch Carriercom France S.a.s.

Terry Bush

Todd Erick Swierk

Weihua Pan

Laurence Lautier

Djamel Ould-Brahim

A virtual tunnel method is described herein which implemented by a host and next hop routers to address a problem that is related to synchronizing active tunnel(s) and active link(s) between the host and next hop routers. Furthermore, a multiple tunnel management method is described herein which implemented by a host to address the problem that is related to synchronizing active tunnel(s) and active link(s) between the host and multiple next hop routers.

Host-router virtual tunnelling and multiple tunnel management

In one aspect, the present invention addresses Layer-3 (L3) connection monitoring between two 'multi-attached' host nodes that are interconnected via an intervening communication network having a known network topology. The present invention provides the two-fold benefit of rapid connection failure detection and failure location determination. In one or more embodiments, the present invention 'pinpoints' the failure location, improving the intelligence of any triggered failure recovery mechanism and/or providing better, more meaningful failure reporting. A BFD session is established between the local and remote host nodes for each L3 communication path between them, e.g., for each unique pairing of local and remote network attachment points. Upon the occurrence of an L3 connection failure, the pattern of up/down states for these BFD sessions is analyzed, along with knowledge of the involved network topology, to determine the apparent location of the L3 connection failure.

Method and apparatus for detecting and locating network connection failures

A first group of core network (CN) nodes are arranged for transmitting a change request from a source to a target radio network controller (RNC), to a CN node selected from the set of CN nodes to which the target RNC is connected. Relating to a communication in progress with a first RNC () and a first CN node (), for which a change from the first to a second RNC () is requested: the change request is transmitted from the first CN node to a second CN node () of the first group, and is forwarded from the second to a third CN node () selected, according to predetermined criteria, from the set of CN nodes to which the second RNC is connected.

Method for managing communications and related core network node

The present invention is a redundancy system in the interface between a wireless and packet-based telecommunications network. The redundancy system includes back-up support components coupled to hub broadcast routers. Because the back-up support component monitors all communications to the primary support component through the communications from the hub broadcast routers, the back-up support component can assume responsibility for the primary interface support component without excessive overhead in sending back-up file information to a redundant component.

Growing community of inventors

Parker, TX, United States of America

Terry Bush