Telefonaktiebolaget Lm Ericsson (publ)

Tobias Ljungström

Rasmus Axén

Ibtissam El Khayat

Jie Ling

Tobias Ahlström

Peter Werner

Qi Xia

Thomas L Lindquist

Björn Knuthammar

Tingyu Zhang

Anders Milén

Tobias AHLSTRÖM

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

A method in a radio network node for selecting a second SCell of a wireless device. The radio network node sends () data to a network node, upon a request to release the wireless device from a first connected state, in which the wireless device is connected to a first PCell and configured with a first SCell. The data indicates the first PCell and the first SCell. The radio network node retrieves () the sent data when the wireless device enters a second connected state. Then, the wireless device is connected to a second PCell. The radio network node compares () the second PCell with the first PCell and the first SCell. When the second PCell is the same as one of the first PCell and the first SCell, the radio network node selects () as the second SCell the other of the first SCell and the first PCell.

Network node, radio network node, and methods for sending a second secondary cell of a wireless device

The present invention is related to cellular radio communication network and is a method for determining a Monitored set (MS) of cells associated with an Active set (AS) of cells by a particular ranking of the neighbouring cells associated with each of the cells in the Active set. A neighbouring cell list is created which contains for each active cell its neighbouring cells. These cells can be in a random order and can include other active cells. A scanning operation is done starting with the neighbouring cell (Cor C) on top of the list which belongs to the strongest active cell (C), whereby this cell will be included in the Monitoring set if certain conditions (3,4; respectively, FIG.). Next, the list associated with the next strongest active cell (C) is considered. This scanning is repeated until the maximum size of the Monitoring set has been reached.

Method for determining a monitored set of cells associated with an active set of cells

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Järfälla, Sweden

Tobias Ljungström