US 11,057,813 B2
Method and apparatus for transmitting downlink data
Shanzhi Chen, Beijing (CN); Hucheng Wang, Beijing (CN); and Ming Ai, Beijing (CN)
Assigned to CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)
Appl. No. 16/960,779
Filed by CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)
PCT Filed Nov. 26, 2018, PCT No. PCT/CN2018/117535
§ 371(c)(1), (2) Date Jul. 8, 2020,
PCT Pub. No. WO2019/134464, PCT Pub. Date Jul. 11, 2019.
Claims priority of application No. 201810016087.X (CN), filed on Jan. 8, 2018.
Prior Publication US 2020/0344656 A1, Oct. 29, 2020
Int. Cl. H04W 36/14 (2009.01); H04W 76/12 (2018.01); H04W 76/32 (2018.01); H04W 36/00 (2009.01)
CPC H04W 36/14 (2013.01) [H04W 36/0033 (2013.01); H04W 76/12 (2018.02); H04W 76/32 (2018.02)] 12 Claims
OG exemplary drawing
 
1. A method for transmitting downlink data, comprising:
determining, by a session management function entity, that a User Equipment, UE, moves from a first network to a second network after receiving a request message for updating session management context of the UE;
notifying, by the session management function entity, a user plane function entity to delete a user plane connection of the UE in the first network and create a user plane connection of the UE in the second network, so that the user plane function entity transmits downlink data of the UE through the user plane connection created in the second network; and
determining, by the session management function entity, that a tunnel type used by the user plane connection in the second network is different from a tunnel type used by the user plane connection in the first network after the session management function entity determines that the UE moves from the first network to the second network and before the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the first network and create the user plane connection of the UE in the second network.