An apparatus comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: identify (702, 704, 706, 708, 710) a stream gate instance associated with a quality of service flow; and determine (712) time sensitive communication assistance information for the quality of service flow based on one or more parameters defining operation of the stream gate instance.