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A method and device for confirming downlink data during LTE handover

A technology of downlink data and handover process, applied in the field of communication, can solve problems such as aggravating business delay, difficulty in meeting industry requirements, and affecting train operation safety, so as to shorten handover delay, reduce data volume, and reduce processing complexity Effect

Inactive Publication Date: 2021-04-16
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The LTE-M specification requires that the communication delay caused by handover should not exceed 150ms. Especially in 1.4MHz and 3MHz networks, a large amount of invalid data forwarding and retransmission in the case of limited air interface resources will increase the service plane time of handover. Delay, resulting in the delay requirements of the train control business can not be guaranteed, affecting the safety of train operation
When the LTE system is applied to similar scenarios, the existing mechanism is difficult to meet the industry requirements. Therefore, it is necessary to improve the processing efficiency of the service plane during the handover process and shorten the service plane delay of the handover

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  • A method and device for confirming downlink data during LTE handover
  • A method and device for confirming downlink data during LTE handover
  • A method and device for confirming downlink data during LTE handover

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Embodiment Construction

[0033] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and examples.

[0034]The invention proposes a method for confirming downlink data in the process of LTE handover, and the RLC layer used for downlink data service indicates confirmation to the PDCP layer. The main idea is: during the reconstruction process of the RLC of the handover source cell, the downlink RLC SDUs that have been fed back by the UERLC layer and whose corresponding RLC PDUs have all received ACKs are indicated to the PDCP layer, even if the RLC SN>VT(A) of these packets , which is also indicated to the PDCP layer. After receiving the instruction from the RLC layer, the PDCP layer discards the confirmed PDCP SDUs from the downlink transmission buffer, and no longer performs forwarding processing, but only forwards the unconfirmed PDCP SDUs, ther...

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Abstract

The present application discloses a method for confirming downlink data in the process of LTE handover, which includes: during the process of rebuilding the radio link control (RLC) layer of the source cell of the handover, the user equipment (UE) RLC layer feedback on the downlink and the corresponding RLC (protocol data unit) PDUs are all confirmed (ACK) RLC service data unit (SDU) indication to the packet data convergence protocol (PDCP) layer; after the PDCP layer receives the instruction of the RLC layer, from The PDCP SDU corresponding to the confirmed RLC SDU is discarded in the downlink sending buffer. The application also discloses a corresponding device. By applying the technical solution disclosed in this application, the processing efficiency of the service plane during the handover process can be improved, and the service plane time delay of handover can be shortened.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a method and device for confirming downlink data during an LTE handover process. Background technique [0002] Long-term evolution (LTE) is a long-term evolution of the Universal Mobile Telecommunications System (UMTS) technical standard formulated by the 3GPP organization. An LTE base station and an LTE terminal communicate through an air interface. The air interface user plane protocol stack includes the physical layer (PHY), medium access control (MAC) layer, radio link control (RLC) layer and packet data convergence protocol (PDCP) layer, such as figure 1 shown. [0003] Each RLC entity is configured by Radio Resource Control (RRC), and has three modes according to service types: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). For the downlink data carried by the RLC AM, the PDCP of the base station (eNodeB) encapsulates t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04L5/00
Inventor 刘洁万欢根夏松娟
Owner POTEVIO INFORMATION TECH CO LTD