Method for realizing data forwarding and donor base station

Abstract

The invention discloses a method for realizing data forwarding, and a donor base station. The method comprises the following steps of: in a handover process of user equipment (UE), when a forwarding path of a bearer which needs to perform the data forwarding relates a Un interface between the donor base station and a relay node, establishing one or more data radio bearers on the Un interface; establishing a one-to-one corresponding relation between the established data radio bearer and a general packet radio service tunneling protocol (GTP) tunnel on the forwarding path of the bearer which needs to perform the data forwarding; and performing forwarding on the bearer which needs to perform the data forwarding through the established data radio bearer and a corresponding GTP tunnel. The technical scheme of the invention can realize the data forwarding in the handover process of the UE when the forwarding path of the bearer which needs to perform the data forwarding relates to the Un interface.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for realizing data forwarding and a donor base station. Background technique [0002] After 3GPP's Long Term Evolution (LTE, Long Term Evolution) technology, the 3GPP organization continued to enhance the LTE solution. This enhanced technology is called LTE-A (LTE-Advanced) technology, that is, LTE-A is the LTE technology subsequent evolution. [0003] In the LTE-A technology, a relay node (RN, Relay Node) is added to the architecture of the access network. RN can be regarded as an extension of evolved base station (eNB), providing more economical coverage for the system. The RN is connected to the eNB through a wireless interface. It can enhance the coverage quality at the edge of the eNB coverage, and can also be deployed outside the eNB coverage area to expand the coverage range. [0004] figure 1 It is a schematic diagram of an RN in an exi...

AI Technical Summary

Problems solved by technology

[0019] Although the existing method roughly gives the handover method based on the X2 interface under the above architecture and the implementation of data forwarding during the handover process, it does not specify how to implement data forwarding in detail.

In particular, data forwarding cannot be realized on the Un interface only by using the existing solution

For example, on the Un interface, when the DeNB receives the handover request confirmation message sent by the target eNB, it cannot directly forward it to the RN, because the user plane of the Un interface does not support the GTP protocol, and the GTP address carried in the handover request confirmation message is important for the RN It cannot be used to establish a transmission channel for data forwarding, but only the RN knows the information that the UE has not received, and the data forwarding can only be initiated by the RN

In addition, the above problems exist when the UE is handed over from eNB to RN, or when the UE is handed over from RN to another RN

[0020] To sum up, in the existing LTE-A system including RN, during the UE handover process, when the forwarding path of the bearer that needs to perform data forwarding involves the Un interface between DeNB and RN, data forwarding cannot be realized

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