Method and device for sending downlink data notification message

Abstract

The embodiment of the invention relates to the field of communication, in particular to a method and a device for sending a downlink data notification message. The method comprises the following steps: receiving a delay indication sent by a mobility management network element, wherein the delay indication is used for indicating delay sending of a downlink data notification message; receiving an event report message sent by a user plane network element, the event report message comprising a reported event, the reported event being used for notifying that a downlink data packet sent to user equipment cannot match a bearer; and if routing information sent by the mobility management network element is not received within a first time period, sending the downlink data notification message to the mobility management network element, the routing information being used for identifying a bearer. According to the scheme provided by the embodiment of the invention, the sending of the downlink data notification message can be reduced, so that the signaling load of the mobility management network element is reduced, and furthermore, the processing complexity of the user plane network element can be reduced.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and a device for sending a downlink data notification (Downlink Data Notification, DDN) message. Background technique [0002] In an Evolved Packet System (EPS) network, such as figure 1 As shown, the Serving Gateway (SGW) and the Packet Data Network Gateway (PDN GW or PGW) integrate the control plane function and the user plane function at the same time, and mainly participate in mobility management and session management, such as access control, data forwarding and billing, etc. For an idle user equipment (User Equipment, UE), since the user plane S1 path (ie S1-U path) and radio bearers do not exist, the UE cannot send uplink data packets to the network; when the SGW receives the downlink data packet , the SGW cannot send the downlink data packet to the UE in the idle state. Wherein, when the SGW receives the downlink data packet and detects that the UE is in the ...

AI Technical Summary

Problems solved by technology

However, under the architecture of distributed gateways, the location of the user plane gateway is relatively low, and it is deployed closer to the UE, and its service range is far smaller than that of the MME. user plane gateway

Since the delayed DDN message is based on the granular operation of the MME, for a user plane gateway, the UE it serves may be registered on multiple MMEs, but in the case of C / U separation, the user plane gateway does not perceive that the UE is registered on multiple MMEs. on which MME

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