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Data retransmission method and device

A technology for data retransmission and retransmission, which is applied in the field of data transmission and can solve problems such as wasting air interface resources.

Active Publication Date: 2015-04-01
COMBA TELECOM SYST CHINA LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a data retransmission method and device to solve the problem in the prior art that a large amount of air interface resources are wasted due to PDCP retransmission of PDUs during the data transmission re-establishment process

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] During normal data transmission, the packet data convergence protocol PDCP of the base station will compress and encrypt the header of the service data unit (Service Data Unit, SDU) stored in the local cache, and add the sequence number SN header to form PDCP The protocol data unit (Protocol Data Unit, PDU) is sent to the radio link control RLC layer. The data is sent to the terminal UE after the automatic repeat request (Automatic ...

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Abstract

The invention discloses a data retransmission method and a data retransmission device. The method comprises the following steps of when a PDCP (Packet Data Convergence Protocol) is established, acquiring an RLC (Radio Link Control) mode of a DRB (Data Radio Bearer), and counting PDUs (Protocol Data Units) needing to be retransmitted; if the RLC mode of the current DRB is an acknowledge mode and the number of the PDUs needing to be retransmitted is greater than a set threshold value, reducing the retransmission rate, and sending the PDUs needing to be retransmitted according to the reduced retransmission rate. According to the method and the device, the data retransmission rate of the PDCP within a period of time in the early stage of data retransmission can be reduced, a state report sent by the PDCP of UE (User Equipment) is waited in the retransmission process, and data which truly need to be retransmitted are re-determined, so that waste of a great number of air interface resources caused by transmission of excess PDUs which are transmitted before reestablishment is avoided.

Description

technical field [0001] The present invention relates to the field of data transmission, in particular to a data retransmission method and device. Background technique [0002] An LTE base station (eNB, evolved Node B) or a user terminal (UE, User Equipment) communicates through an air interface. From a functional point of view, the air interface protocol includes a user plane protocol stack and a control plane protocol stack. Wherein, the air interface protocol stack includes the following layers: Radio Resource Control (Radio Resource Control, RRC) layer, Packet Data Convergence Protocol (Packet Data Convergence Protocol, PDCP) layer, Radio Link Control (Radio Link Control, RLC) layer, media Access Control (Medium Access Control, MAC) layer. [0003] During normal data transmission, the PDCP of the base station will compress and encrypt the data plane Service Data Unit (SDU) stored in the local cache, and then add the sequence number SN header to form a PDCP protocol data ...

Claims

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Application Information

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IPC IPC(8): H04L1/18
CPCH04L1/18H04W28/22
Inventor 李宝龙
Owner COMBA TELECOM SYST CHINA LTD
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