Patent ID: 7936723
Filing Date: 2011-05-03
Classification: H04L,H04W

Abstract:
1. A method for transmitting a status report of a Packet Data Convergence Protocol (PDCP) layer in a mobile communications system, in a method for transmitting, by a receiving side PDCP layer, a status report for a series of data to a transmitting side PDCP layer, the method comprising: determining, by the receiving side PDCP layer, a reception status of the series of data, wherein the series of data are PDCP Service Data Units (SDUs); and transmitting, by the receiving side PDCP layer, a reception status report for the PDCP SDUs to the transmitting side PDCP layer, such that the transmitting side PDCP layer is able to transmit or retransmit the series of data during handover, wherein the reception status report is transmitted in the form of a bitmap including sequence number (SN) information of the PDCP SDUs indicating whether or not the PDCP SDUs have successfully been received, wherein the format of the PDCP data including the reception status report comprises a D/C field, a PDU type field, a bitmap field and a field including SN information on a PDCP SDU corresponding to the first or last bit of the bitmap field, the PDCP data being configured by arranging the fields in the order of the D/C field, the PDU type field, the field including the SN information of the PDCP SDU, and the bitmap field.