User equipment and method of user equipment for receiving downlink data

摘要

The present invention discloses a UE (User Equipment) and a method of the UE for receiving downlink data to avoid the occurrence of mistakes when the UE receives the downlink data. The method comprises the following steps: during the reestablishment, in the process of transmitting Service Data Units (SDU) to a Packet Data Convergence Protocol (PDCP) entity from a Radio Link Control (RLC) entity in the UE, if the PDCP entity judges that the PDCP Sequence Number (SN) of the received PDCP Protocol Data Unit (PDU) which includes the SDU satisfies the report condition, the PDCP PDU is received and the SDU included in the PDCP PDU is submitted to the upper layer entity, wherein the report condition is: PDCP SN=(Last_Submitted_PDCP_RX_SN+1)%(Maximum_PDCP_SN+1).

主权项

1. A method of a user equipment for receiving downlink data, comprising:
during the reestablishment, in the process of transmitting service data unit (SDU) to a packet data convergence protocol (PDCP) entity in the PDCP layer from a radio link control (RLC) entity in the RLC layer in the UE, the SDU being configured as the downlink data received from the eNB before the reestablishment; and the PDCP entity judging whether the PDCP serial number (SN) of the received PDCP protocol data unit (PDU) which includes the SDU satisfies the report condition or not, wherein if yes, it submits the SDU included in the PDCP PDU to an upper layer entity, wherein the report condition is:
PDCP SN=(Last_Submitted_PDCP_RX_SN+1)%(Maximum_PDCP_SN+1) wherein, Last_Submitted_PDCP_RX_SN refers to the PDCP SN of the PDCP PDU which the latest SDU submitted to the upper layer entity belongs to; Maximum_PDCP_SN refers to the maximum value of the PDCP SN; and the % refers to modular operation; if judging that the PDCP SN of the received PDCP PDU which includes the SDU does not satisfy the report condition but satisfies the saving condition, the PDCP entity storing the PDCP PDU in the buffer memory of the PDCP entity, the saving condition being as follows:
(Last_Submitted_PDCP_RX_SN+1)%(Maximum_PDCP_SN+1)