Patent ID: 11889373
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A wireless device for re-establishing a radio connection in a wireless communications network comprising a first Radio Access Technology, RAT, and a second RAT being different from the first RAT, wherein the wireless device is configured to operate in a first cell served by a first radio network node configured to operate in the first RAT, and wherein the wireless device is configured to:
when a connection failure with the first cell served by the first radio network node is detected:
perform a cell selection;
select a second cell served by a second radio network node operating in the second RAT, wherein the second cell is known by the wireless device to be a candidate for re-establishment;
determine a first set of parameters associated with the first cell, wherein the first set of parameters comprises at least one parameter identifying the wireless device or the first cell;
receive a second set of parameters associated with the second cell, wherein the second set of parameters comprises at least one parameter identifying the wireless device or the second cell;
determine an updated version of one or more parameters of the first set of parameters or an updated version of one or more parameters of the second set of parameters;
determine a security token based on at least one out of: the first set of parameters and the updated version of the one or more parameters of the first set of parameters, and based on at least one out of: the second set of parameters and the updated version of the one or more parameters of the second set of parameters; and
transmit to the second cell, a re-establishment request message comprising the determined security token.