Patent ID: 8098771

Claim:
A receiver apparatus for receiving data units over at least a channel, wherein said receiver apparatus comprises a lower layer and a higher layer with at least a higher layer protocol entity, said higher layer protocol entity is assigned to said lower layer, said lower layer comprises a reordering buffer to buffer at least a data unit input to said lower layer as a protocol data unit, and said lower layer is adapted to output at least a part of said data unit at least indirectly to said higher layer as a service data unit, when said lower layer detects said data unit as a next expected protocol data unit, said lower layer is adapted to detect a sequence number for said higher layer protocol entity, which sequence number is included in said data unit buffered in the reordering buffer, and said lower layer is adapted to output at least a part of said data unit buffered in said reordering buffer at least indirectly to said higher layer protocol entity as a service data unit, when said lower layer detects that said sequence number for said higher layer protocol entity is regarded as a next expected sequence number for said higher layer protocol entity.