DETERMINING TIMING OF FEEDBACK INFORMATION IN WIRELESS NETWORKS REALISED IN DIFFERENT TECHNOLOGIES

摘要

The invention relates to a method in a user equipment 4 for determination of timing of a Hybrid Automatic Repeat re-Request, HARQ, response. The user equipment 4 operates in a communication network 1 comprising a primary radio access technology system 2 and a secondary radio access technology system 3. The user equipment 4 receives on at least one downlink carrier on the first radio access technology system 2 and on at least one downlink carrier on the second radio access technology system 3. The method comprises determining a downlink timing related to the secondary radio access technology system 3; determining an uplink timing related to the primary radio access technology system 2; and determining an uplink time instance for transmission of the HARQ response on an uplink carrier of the primary radio access technology system 2, wherein the HARQ response relates to data received on the downlink carrier on the secondary radio access technology system 3 and wherein the uplink time instance for transmission of the HARQ response is based on an uplink timing for a HARQ response on the secondary radio access technology system 3 and the downlink timing related to the secondary radio access technology system 3. The invention also relates to user equipment, radio base stations and methods therein.