A method and device for sending downlink data notification message

Abstract

The embodiments of the present invention relate to the communication field, and in particular to a method and device for sending downlink data notification messages. The method is: receiving a delay indication sent by a mobility management network element, where the delay indication is used to indicate a delay in sending a downlink data notification message; receiving an event report message sent by a user plane network element, where the event report message includes a reported event, and the The above reported event is used to notify that the downlink data packet sent to the user equipment does not match the bearer; if the routing information sent by the mobility management network element is not received within the first time period, send the routing information to the mobility management network element In the downlink data notification message, the routing information is used to identify a bearer. The solution of the embodiment of the present invention can reduce the sending of the downlink data notification message, thereby reducing the signaling load of the mobility management network element, and further, can also reduce the processing complexity of the user plane network element.

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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