Bearer release

A user equipment method, user equipment, a base station method, a base station and computer program products. The user equipment method, comprises: on reception of a trigger instructing modification of an access stratum radio bearer, preventing release of an associated non-access stratum bearer. In this way, when an access stratum or data radio bearer is instructed to be modified (as may occur when security credentials for that bearer need to be updated), the associated non-access stratum bearer may be retained in order to allow a update in security credentials to occur without disrupting communication or losing data.