Patent ID: 8712336

Claim:
A method of controlling a data unit receiver arranged to receive data units from a sender over a network, said sender being arranged to send said data units in an ordered sequence, each data unit comprising a sequence position identifier, the method comprising: a gap detection and response procedure in said data unit receiver for monitoring said sequence position identifier in said data units and detecting and responding to a gap among said data units with respect to said ordered sequence, a reordering detection procedure in said data unit receiver for detecting a reordering indication that is indicative of a potential reordering of data units in a course of a transmission from said sender to said data unit receiver, and adapting said gap detection and response procedure in response to detecting said reordering indication so as to make a response to said gap suitable for said re-ordering indication instead of for a data unit loss being a cause of said gap, wherein adapting said gap detection and response procedure comprises: dividing said data units into at least two groups in dependence on said reordering indication, and applying said gap detection and response procedure separately to said groups.