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Downlink switching method and system

A handover system and handover request message technology, applied in the LTE field, can solve the problems of increasing the service load of the source access party, wasting air interface resources, increasing interference between users, etc., so as to increase practicability, avoid repeated transmission, and simplify service implementation. Effect

Active Publication Date: 2012-05-09
北京万海云科技有限公司
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  • Claims
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Problems solved by technology

It can be seen that the same data is sent twice on the air interface, which leads to repeated transmission of data on the air interface, wastes the resources of the air interface, and further increases the interference between users
[0009] Furthermore, since the SGW of the UE still sends all the data of the UE to the source access party of the UE before receiving the user plane update request, the source access party may cache a large number of data that the UE cannot confirm. After that, the source access party must forward a large amount of data to the target access party, which greatly increases the business load of the source access party

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  • Downlink switching method and system
  • Downlink switching method and system

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Embodiment Construction

[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] At present, there is a proposal to associate PDCP (Packet Data Convergence Protocol) sequence numbers on the Un interface and the Uu interface, so as to avoid repeated transmission of data on the air interface. The core idea is: see figure 1 , still taking the example where the source access party and the target access party are RN and the RN’s DeNB respectively, the sequence number of the data packet sent by the DeNB received by the RN through the Un interface and the sequence number of the data packet sent by the RN through the Uu interface The serial number is mapped, that is, the associated PDCP serial number is used on the Un and Uu interfaces. Only after receiving the ACK feedback of the data sent by the UE on the Uu interface, the RN...

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Abstract

The invention discloses a downlink switching method and a system. The method comprises the following steps: a data transmission stopping singling is sent to an SGW of an UE in a setting time, wherein the setting time is before sending a user interface updating request to the SGW of the UE, after receiving the data transmission stopping singling, the SGW of the UE stops sending the data of the UE to a source access party of the UE; and after receiving the user interface updating request, the SGW of the UE switches downlink paths according to the information of a target access party in the request and restores data transmission to the target access party of the UE. The invention can reduce repeated data transmission at null ports to a maximum extent.

Description

technical field [0001] The present invention relates to LTE (Long Term Evolution) technology, in particular to a downlink switching method and system in the LTE system. Background technique [0002] In order to enhance the LTE system, a solution of adding an RN (relay node) to the architecture of the LTE radio access network is currently proposed. The RN node is set between the UE (user equipment) and the eNodeB (base station), which can be regarded as an extension of the eNodeB, providing more economical coverage for the system, and can enhance the coverage quality at the edge of the eNodeB coverage, or in the eNodeB coverage area It can be deployed outside to extend the coverage area, thereby improving the spectrum efficiency and user data rate of the system. [0003] figure 1 It is a schematic diagram of the basic architecture after adding RN nodes in the LTE system. see figure 1 , in LTE, the eNodeB that provides wireless access for RN is called DeNB (donor base stat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/02
Inventor 岳然赵训威姜怡华
Owner 北京万海云科技有限公司