US 12,445,935 B2
Data transmission method and apparatus
Feng Han, Shanghai (CN); Yinghao Jin, Boulogne Billancourt (FR); Hongzhuo Zhang, Shanghai (CN); and Xudong Yang, Shanghai (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Sep. 23, 2021, as Appl. No. 17/482,813.
Application 17/482,813 is a continuation of application No. PCT/CN2020/081830, filed on Mar. 27, 2020.
Claims priority of application No. 201910252629.8 (CN), filed on Mar. 29, 2019.
Prior Publication US 2022/0015007 A1, Jan. 13, 2022
Int. Cl. H04W 40/24 (2009.01); H04W 76/27 (2018.01)
CPC H04W 40/248 (2013.01) [H04W 76/27 (2018.02)] 15 Claims
OG exemplary drawing
 
1. A data transmission system, comprising:
a first access network device; and
a second access network device, wherein the first access network device currently serves a terminal in a radio resource control (RRC) inactive state, and the second access network device is an access network device that previously served the terminal and configured the terminal to enter the RRC inactive state, and
wherein the first access network device comprises at least one first processor, and one or more first memories coupled to the at least one first processor and storing first programming instructions that, when executed by the at least one first processor, cause the first access network device to:
send a retrieve terminal context request message to the second access network device, wherein the retrieve terminal context request message comprises indication information indicating a requirement of transmitting small data, and the small data is uplink data;
wherein the second access network device comprises at least one second processor, and one or more second memories coupled to the at least one second processor and storing second programming instructions that, when executed by the at least one second processor, cause the second access network device to:
send, to the first access network device, a context of the terminal and an address of a tunnel used to transmit the uplink data, wherein the tunnel is established between the second access network device and the first access network device;
wherein the first programming instructions, when executed by the at least one first processor, further cause the first access network device to:
receive, from the second access network device, the context of the terminal and the address of the tunnel used to transmit the uplink data;
receive the uplink data sent by the terminal; and
send the uplink data to the second access network device based on the address of the tunnel; and
wherein the second programming instructions, when executed by the at least one second processor, further cause the second access network device to:
receive the uplink data from the first access network device; and
send the uplink data to a core network device.