Data transmission methods and device applied between packet data convergence protocol (PDCP) entity and radio link control (RLC) entity

Abstract

The invention discloses data transmission methods and a data transmission device applied between a packet data convergence protocol (PDCP) entity and a radio link control (RLC) entity. In one method, after receiving a PDCP service data unit (SDU) from a high layer, the PDCP entity acquires a PDCP protocol data unit (PDU) which corresponds to the PDCP SDU, and then directly transmits the PDCP PDU to the RLC entity. In another method, a sending buffer area is arranged on a PDCP sub-layer; after receiving the PDCP SDU from the high layer, the PDCP entity stores the PDCP SDU in the sending buffer area of the PDCP sub-layer; and after receiving an RLC SDU request which is sent by the RLC entity, the PDCP entity transmits the PDCP PDU which corresponds to the PDCP SDU in the sending buffer area of the PDCP sub-layer to the RLC entity according to the RLC SDU request. By the invention, data transmission between the PDCP sub-layer and an RLC sub-layer is realized; and by defining the sending buffer area of the PDCP sub-layer, storing the PDCP SDU which is received from the high layer in the sending buffer area of the PDCP sub-layer by using the PDCP entity, and transmitting the PDCP PDU which corresponds to the PDCP SDU in the sending buffer area to the RLC entity, data packet interactive operation between the PDCP sub-layer and the RLC sub-layer is realized.

Description

technical field [0001] The present invention relates to the communication field, in particular to a data transmission method and device applied between a PDCP entity and an RLC entity. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) air interface layer 2 protocol, the data between the PDCP (Packet Data Convergence Protocol, packet data concentration protocol) sublayer and the RLC (Radio Link Control, radio link control) sublayer are described. The packets are interoperable, and the sending buffer and retransmission buffer existing on the sending side are listed in the RLC entity block diagram in the RLC protocol. [0003] In the LTE PDCP sublayer protocol TS36.323, for the transmission and retransmission of PDCP PDU, there are the following regulations: [0004] For the PDCP SDU (Service Data Units, service data unit) received from the upper layer, the PDCP sublayer associates the SN (Sequence Number, sequence number), performs header com...

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Problems solved by technology

[0023] It can be seen that although the delivery related operations of PDCP PDU (RLC SDU) between the PDCP sublayer and the RLC sublayer are specified at present, and it is confirmed that there is a sending buffer in the RLC sublayer, there is no provision for the transmission between the PDCP sublayer and the RLC sublayer. The specific implementation method of data transmission between

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