WIRELESS COMMUNICATION APPARATUS AND METHOD

摘要

A transmission node in a wireless communication network includes a buffer, a transmitting section, a data processing section, a re-transmit queue, and a control section. To avoid duplication of SDUs for re-transmission, PDUs transformed from SDUs by the data processing section are maintained in the buffer by the control section after being transmitted to a mobile node in the network by the transmitting section. Addresses of the SDUs and associated sequence numbers are stored in the re-transmit queue. When handover of the mobile node from the transmission node to another transmission node occurs, PDUs of which the addresses are stored in the re-transmit queue are reverse transformed to SDUs with the associated sequence numbers so that the SDUs can be handed over to another transmission node.

主权项

1. A transmission node in a wireless communication network, comprising:
a buffer having a plurality of entries with corresponding addresses for storing data to be transmitted to another node in the network, wherein the data includes a Service Data Unit (SDU) and a Protocol Data Unit (PDU); a transmitting section connected to the buffer for transmitting the data to the other node in the network; a data processing section connected to the buffer for transforming the data between a SDU and a PDU; a re-transmit queue for storing addresses of a plurality of SDUs stored in the buffer and associated sequence numbers assigned to the SDUs, wherein the SDUs require re-transmission; and a control section connected to the buffer, the re-transmit queue and the transmitting section for adding the address of the SDU and the associated sequence number assigned to the SDU to the re-transmit queue, and maintaining the PDU transformed from the SDU in the entry of the buffer after the PDU is transmitted to a mobile node, wherein after a handover of the mobile node from the transmission node to the other transmission node occurs, the data processing section reverse transforms the PDU of which the address are stored in the retransmit queue back to the SDU with the associated sequence number stored in the retransmit queue, and the transmitting section transmits the reverse transformed SDU to the second transmission node.