Patent ID: 9743318
Date: 2017-08-22
CPC Classifications: H04W

Claim:
1. A method, performed by a first radio network node, for supporting a handover of a wireless device from a first Radio Access Network (RAN) of a first Radio Access Technology (RAT), to a second RAN of a second RAT that is different from the first RAT, wherein the first and second RATs are supported by the wireless device, said first radio network node is comprised in the first RAN and said first and second RANs are comprised in a cellular radio system, and wherein the method comprises: in response to the handover of the wireless device from the first RAT to the second RAT having been triggered, sending, to the wireless device, a request to return a compressed version of RAT capability information, where said RAT capability information is associated with the wireless device and at least one of the first RAT and the second RAT; receiving, from the wireless device in response to the request, the compressed version of the RAT capability information; and sending the compressed version of the RAT capability information to a second radio network node comprised in the second RAN.