Data discard signalling procedure in a wireless communication system

A method for terminating a service data unit (SDU) discard with explicit signalling procedure comprising:

• transmitting a first status protocol data unit (STATUS PDU1) comprising a move receiving window super-field (MRW SUFI) by a sender to a receiver;
• wherein the MRW SUFI comprises at least a sequence number field (SN_MRWLENGTH);
• receiving a second status protocol data unit (STATUS PDU2) comprising an acknowledgement super-field (ACK SUFI) by the sender from the receiver;
• wherein, if VT(A) to be updated by STATUS PDU2 is greater than or equal to SN_MRWLENGTH in MRW SUFI, the SDU discard with explicit signalling procedure is terminated;
• wherein, if STATUS PDU2 acknowledges all protocol data units up to and including a protocol data unit with a sequence number equal to SN_MRWLENGTH minus one, the SDU discard with explicit signalling procedure is terminated;
• and
• wherein, if STATUS PDU2 indicates a state variable VR(R) is greater than or equal to SN_MRWLENGTH, the SDU discard with explicit signalling procedure is terminated.

A method for a service data unit (SDU) discard with explicit signalling procedure comprising:

• discarding more than 15 SDUs;
• and
• transmitting a first status protocol data unit (STATUS PDU1) comprising a move receiving window super-field (MRW SUFI) by a sender to a receiver;
• wherein the MRW SUFI comprises an NLENGTH field indicating which length indicator in a PDU with sequence number SN_MRWLENGTH corresponds to a last RLC SDU to be discarded in the receiver;
• wherein the MRW SUFI comprises at least a sequence number field (SN_MRWLENGTH) indicating the receiver to discard all PDUs with sequence number <SN_MRWLENGTH and to move a reception window accordingly;
• and
• wherein NLENGTH equals 0 indicates that a last RLC SDU ended in the PDU with sequence number SN_MRWLENGTH minus 1 and that a first data octet in the PDU with sequence number SN_MRWLENGTH is a first data octet to be reassembled next.