Telefonaktiebolaget Lm Ericsson (publ)

Qi Xia

Di Liu

Yong Yang

Lei Guo

Dongmei Zhu

Xiao Li

Wei Gu

Ibtissam El Khayat

Jie Ling

Tingyu Zhang

Lasse Olsson

Zhiwei Qu

Peter Werner

Erik De Wit

Lirong Sun

Ping Sha

Tobias Ljungström

Björn Knuthammar

Huiping Ding

Mikael Östborn

Lennart Sörenson

Håkan Svensson

Zongshuai Zhang

Zhao Yu

Restoration procedures in a Multimedia Broadcast Multicast Service (MBMS) network (also referred to as evolved MBMS (eMBMS) network) in case of a path failure.

MBMS session restoration in EPS for path failure

For managing multicast transmissions in a cellular network, a control plane module () of a gateway node () of the cellular network establishes one or more control plane sessions associated with the multicast transmissions. Further, a user plane module () of the gateway node () establishes one or more user plane sessions associated with the multicast transmissions. The control plane module () of the gateway node () indicates context information of the control plane session(s) to an external storage (). During a failure of the control plane module () of the gateway node (), the user plane module () of the gateway node () maintains the user plane session(s). After recovery from the failure of the control plane module () of the gateway node (), the control plane module () of the gateway node receives the context information from the external storage () and re-establishes at least one of the more control plane session(s) on the basis of the received context information.

Maintaining user plane session and restoring control plane session in case of control plane module failure of gateway for multicast transmissions

A smart 3GDT schema has been disclosed, in detail, a method for controlling the communication of a network system has been disclosed. The network system comprises a UE, a NodeB, a RNC, a SGSN, and a GW. The UE is arranged to be in communication with the RNC via the NodeB, and the RNC is arranged to be in communication with the SGSN which in turn being arranged to be in communication with the GW for non-3GDT communication of the network system, or the RNC is arranged to be in communication with the GW for 3GDT communication of the network system. In this method, statistics of payload transferred between the UE and the GW has been monitored, and if the statistics of payload within a predetermined time period exceeds a first threshold, and the UE is in the non-3GDT communication, then switching the non-3GDT communication to the 3GDT communication. The present application has also disclosed the SGSN, GW, and the network system adaptive to perform the method.

Smart 3GDT

The present invention relates generally to restoration procedures in a Multimedia Broadcast Multicast Service (MBMS) network (also referred to as evolved MBMS (eMBMS) network) in case of a path failure.

Multimedia broadcast multicast service (MBMS) gateway for restoring an MBMS session after path failure

A control node () of a cellular network establishes one or more control plane sessions with a gateway node (). On the basis of these one or more control plane sessions with the gateway node (), the control node () also establishes one or more control plane sessions with one or more radio access network nodes () to control multicast transmissions by the one or more radio access network nodes (). Further, the control node () detects a connection failure to the gateway node (). When detecting the connection failure, the control node () starts a first timer. Further, also the gateway node () detects the connection failure. When detecting the connection failure, the gateway node () starts a second timer. The second timer is configured with a longer duration than the first timer. In response to expiry of the first timer, the control node () locally deletes the one or more control plane sessions with the gateway node () and with the one or more control plane sessions with the one or more radio access network nodes (). In response to expiry of the second timer, the gateway node () triggers a reaction to the connection failure by the gateway node (), e.g., selection of an alternative control node.

Handling of control interface failure in multicast transmissions via a cellular network

Methods and elements are disclosed for controlling services in a specific location in a wireless communication network, by configuring a policy comprising service control information and location based information corresponding to the specific location for controlling services for user equipments, UEs in the location from a second core network element.

Telecommunications system and method

A method for paging a user equipment, UE, in a radio access network, RAN, served by a core network node. When a UE attaches to the radio access network, a service area identity included in the respective a respective registration message from each UE, is received and registered in the core network node. The method further includes a step of receiving one or more data packets to be sent to a receiving UE attached to the network and determining a permitted latency for delivery of the one or more data packets to the UE. When permitted latency exceeds a predetermined latency threshold, a step of retrieving the registered SAI for the receiving UE is performed. In a concluding step in the method of paging, a first page is performed of the UE, directing the first page to cells belonging to a first paging area determined by the retrieved SAI.

Method and nodes for paging in a radio access network

The embodiments herein relate to a method in a second CN node () for handling a failure in a communications network (). The failure has caused communication between the second CN node () and an old first CN node () to become unavailable. The communication is associated with a session. When the failure has been detected, the second CN node transmits a session start request message to a new first CN node (). The session start request is a request to restore the session. The session start request message comprises a restoration flag indicating restoration of the session for a same service established before the failure and allowing a RAN node () in the communications network () to accept the session start request message.

Method and nodes for handling a failure in a communications network

Multicasting in Multimedia Broadcast Multicast Service (MBMS) nodes and the respective nodes. The method in a node configured as an MBMS gateway includes, in response to receipt of a session start request message for a multicast session, allocating a transport network IPv4 multicast address and a transport network IPv6 multicast address for the session, and generating another session start request message and transmitting it to a node configured as a Mobility Management Element (MME). The session start request message includes a first pair of the allocated transport network IPv4 multicast address and an IPv4 multicast source address, and a second pair of the allocated transport network IPv6 multicast address and an IPv6 multicast source address. In response to receipt of MBMS data from a node configured as a Broadcast-Multicast Service Center (BM-SC), the MBMS data is sent using at least one of the first and second pair of addresses.

IPV4 and IPV6 support in an MBMS network

The present invention relates to a method for improving IP fragmentation and transmission of user payload between a User Equipment, UE (), and a Peer Node, PN (). The payload is transmitted through a transmission path enabled by at least a first () and a second () established tunnel, said tunnels connecting a first (), () and a second () node in a Packet Core Network, PCN. The method comprises the steps of: The first node () fragments () at least one received payload packet () into fragments () on the basis of a minimum Maximum Transmission Unit, MTU, for an upper IP layer of the transmission path. The first node () encapsulates () said fragments at the entry of the first tunnel (). What particularly characterizes the method is that it further comprises a step where the first node () determines () the MTU for the upper IP layer of the transmission path on the basis of an MTU of a lower IP layer of the transmission path and on the basis of the size of at least one additional tunnel header for the encapsulated fragments ().

IP fragmentation in GTP tunnel

For improved IP fragmentation and transmission, user payload is transmitted through a transmission path enabled by at least a first established tunnel () and a second () established tunnel. The tunnels connect a first node () and a second () node in a Packet Core Network (PCN). A method comprises the first node fragmenting () at least one received payload packet () into fragments () on the basis of a minimum Maximum Transmission Unit (MTU) for an upper IP layer of the transmission path; encapsulating () the fragments at the entry of the first tunnel, and, determining () the MTU for the upper IP layer of the transmission path on the basis of an MTU of a lower IP layer of the transmission path and on the basis of the size of at least one additional tunnel header for the encapsulated fragments ().

Growing community of inventors

Shanghai, China

Qi Xia