Abstract: The present invention provides a method for specifying actions that a receiver takes upon receiving an AM or UM PDU with an error indication. Currently, for RLC acknowledged mode (AM) and unacknowledged mode (UM), upon receiving an AM or UM PDU with an error indication, actions that the receiver takes are not specified. Inappropriate actions that the receiver takes can cause serious problems. For example, unnecessary reset procedures are initiated, unnecessary retransmissions are made, data is lost, or synchronization between the sender and receiver can be lost. In an embodiment of the present invention, for RLC AM, upon receiving an AM PDU with an error indication, the receiver discards this PDU. In another embodiment of the present invention, for RLC UM, upon receiving an UM PDU with an error indication, the receiver discards this PDU. In another embodiment, MAC discards a MAC SDU that is to be delivered to an AM or a UM RLC entity, if an error indication for this SDU has been received from the lower layer.

Abstract: The present invention provides a scheme for handling radio resource control messages during a radio link control reset in a wireless communication system. Conventionally, if an RLC reset occurs before receiving positive acknowledgements of all RLC PDUs transmitted, the PDUs not correctly received cannot be retransmitted after an RLC reset. The upper layer usually sets a timer for retransmission of an upper layer message contained in this RRC message. The RLC reset delays the transmission of messages of the upper layer. However, with the present invention, because the RRC is informed of the RLC reset, the RRC can retransmit those messages which were submitted to the RLC before the RLC reset and might not be received correctly by the peer RRC due to the RLC reset. In this way, data loss and delays associated with the conventional method are avoided and system performance in wireless communications is improved.

Abstract: The present invention provides a method for specifying actions that a receiver takes upon receiving an AM or UM PDU with an error indication. Currently, for RLC acknowledged mode (AM) and unacknowledged mode (UM), upon receiving an AM or UM PDU with an error indication, actions that the receiver takes are not specified. Inappropriate actions that the receiver takes can cause serious problems. For example, unnecessary reset procedures are initiated, unnecessary retransmissions are made, data is lost, or synchronization between the sender and receiver can be lost. In an embodiment of the present invention, for RLC AM, upon receiving an AM PDU with an error indication, the receiver discards this PDU. In another embodiment of the present invention, for RLC UM, upon receiving an UM PDU with an error indication, the receiver discards this PDU. In another embodiment, MAC discards a MAC SDU that is to be delivered to an AM or a UM RLC entity, if an error indication for this SDU has been received from the lower layer.

Abstract: The present invention provides a data discard signaling procedure in a wireless communication system. A Radio Link Control (RLC) provides PDCP in-sequence confirmations. The in-sequence confirmation means that confirmations shall be delivered to PDCP in the same order as PDCP PDUs submitted by PDCP. The sending RLC Acknowledge Mode (AM) entity confirms PDCP Service Data Units (SDUs) with Sequence Numbers (SN) that are positively acknowledged by the peer receiving RLC AM entity. In this way, PDCP PDUs and associated PDCP SDUs with SNs not positively acknowledged will not be deleted by the sending PDCP entity. Another solution provided by the present invention is when the SN for a PDCP SDU carried in a PDCP PDU confirmed by the RLC is larger than the smallest SN for the unconfirmed PDCP SDU, PDCP shall not delete this PDCP PDU and its associated SDU confirmed by RLC until the SN for this PDCP SDU indicated by this confirmation is the smallest or earliest SN.

Abstract: The present invention provides a scheme for handling a radio link control reset protocol data unit (RLC RESET PDU) or reset acknowledge protocol data unit (RESET ACK PDU) in a wireless communication system. Depending upon certain criteria, upon reception of RLC RESET PDU or RESET ACK PDU, the RLC receiver may or may not discard RLC SDUs that were transmitted or were not transmitted before the reset or re-establishment in the transmitting side of the AM RLC entity. Additionally, the first compressed packet type after an RLC reset is a full header or compressed TCP with no delta. Since a proper handling scheme is disclosed, data loss is prevented, compressed data are successfully decompressed, unnecessary retransmissions are avoided, and wasting of system resources is reduced. Therefore, system performance of a wireless communication system is improved.

Abstract: The present invention provides a procedure for confirming data transmission which efficiently eliminates problems existing in lossless SRNS Relocation and PDCP Sequence Number synchronisation and improves wireless communication system performance. A PDCP SeqNum PDU is sent when the PDCP sender thinks it needs to send it. If the PDCP receiver is aware of the PDCP sender should not send a PDCP SeqNum PDU but receives a PDCP SeqNum PDU, the PDCP receiver shall not use the sequence number in the PDCP SeqNum PDU to set UL/DL Receive SN. A PDCP SeqNum PDU is sent after, an RLC reset procedure, and/or an RLC re-establishment not caused by a SRNS Relocation, and/or next expected UL/DL receive PDCP sequence number is considered invalid after SRNS Relocation. Therefore, if a PDCP SeqNum PDU is received but not immediately after the above procedures, the sequence number in the PDCP SeqNum PDU should not be used to set UL/DL receive SN. The Data in PDCP SeqNum PDU may or may not be discarded.