Systems and methodologies are described that facilitate unbundling and processing partial packet data units (PDU). PDUs can be transmitted at a communication layer and can include partial PDUs of a disparate communication layer. Complete SDUs can be determined in the partial PDU and provided to an upper communication layer. In addition, however, the partial PDU can comprise a partial SDU. Upon receiving a remaining or additional portion of the partial PDU, a remaining or additional portion of the partial SDU can be combined with the partial SDU to create a complete SDU (or a larger portion thereof). Where a complete SDU is created, it can be provided to an upper communication layer. Alternatively, the partial PDU can be combined with the remaining portion of the partial PDU to generate a complete or larger PDU, from which the previously incomplete SDU can be retrieved and provided to an upper communication layer.