Patent ID: 9717070
Date: 2017-07-25
CPC Classifications: H04L,H04W

Claim:
1. A method, in a user equipment, for determination of timing of a Hybrid Automatic Repeat re-Request (HARQ) response, the user equipment operating in a communication network comprising a primary radio access technology system and a secondary radio access technology system, the user equipment receiving data on at least one downlink carrier on the first radio access technology system and on at least one downlink carrier on the second radio access technology system, the user equipment transmitting the HARQ response on an uplink carrier of the first radio access technology system, the method comprising: determining a downlink timing related to the secondary radio access technology system; determining an uplink timing related to the primary radio access technology system; and determining an uplink time instance for transmission of the HARQ response on the uplink carrier of the primary radio access technology system; and wherein the HARQ response relates to data received on the downlink carrier on the secondary radio access technology system; and wherein determining the uplink time instance for transmission of the HARQ response comprises determining the uplink time instance for transmission of the HARQ response based on an uplink timing for an HARQ response on the secondary radio access technology system and the downlink timing related to the secondary radio access technology system and setting the uplink time instance to the next uplink timing related to the primary radio access technology system.