Methods, devices, and medium for communication
Example embodiments of the present disclosure relate to UP transmission for a device in an inactive mode. A first network device transmits data received from a terminal device in an inactive mode via a connection established for the terminal device between the first network device and the second network device to a second network device, and transmits, to the second network device, a first indication indicating a termination of a data transmission related with the terminal device if a first condition is met. Through this solution, the connection established for the terminal device in the inactive mode between the first network device and the second network device to a second network device may be terminated suitable.
1 . A method performed by a first network device, the method comprising:
transmitting a retrieve user equipment (UE) context request message to a second network device;
receiving a partial context for a terminal device from the second network device;
transmitting a first message comprising a reason for termination of a small data transmission (SDT) procedure to the second network device;
receiving a second message comprising a radio resource control (RRC) release message from the second network device, wherein the second message is a RETRIEVE UE CONTEXT FAILURE message; and
transmitting the RRC release message to the terminal device.
2 . The method of claim 1 , wherein the reason for termination of the SDT procedure comprises no more packets to be transmitted or large uplink SDT data from a buffer state report (BSR).
3 . The method of claim 1 , wherein, after the SDT procedure is terminated by the second network device, downlink data transferring between the first network device and the second network device is stopped.
4 . The method of claim 1 , wherein the transmitting the first message and the receiving the second message are over an Xn interface.
5 . A method performed by a terminal device, the method comprising:
transmitting a radio resource control (RRC) resume request message and uplink small data transmission (SDT) data to a first network device; and
receiving a RRC release message from the first network device,
wherein a retrieve user equipment (UE) context request message is transmitted from the first network device to a second network device, a partial context for the terminal device is transmitted from the second network device to the first network device, a first message comprising a reason for termination of a SDT procedure is transmitted from the first network device to a second network device, and a second message comprising the RRC release message is transmitted from the second network device to the first network device, and
wherein the second message is a RETRIEVE UE CONTEXT FAILURE message.
6 . The method of claim 5 , wherein the reason for termination of the SDT procedure comprises no more packets to be transmitted or large uplink SDT data from a buffer state report (BSR).
7 . The method of claim 5 , wherein, after the SDT procedure is terminated by the second network device, downlink data transferring between the first network device and the second network device is stopped.
8 . The method of claim 5 , wherein the transmitting the first message and the receiving the second message are over an Xn interface.
9 . A first network device comprising a processor configured to cause the first network device to:
transmit a retrieve user equipment (UE) context request message to a second network device;
receive a partial context for a terminal device from the second network device;
transmit a first message comprising a reason for termination of a small data transmission (SDT) procedure to the second network device;
receive a second message comprising a radio resource control (RRC) release message from the second network device, wherein the second message is a RETRIEVE UE CONTEXT FAILURE message; and
transmit the RRC release message to the terminal device.
10 . The first network device of claim 9 , wherein the reason for termination of the SDT procedure comprises no more packets to be transmitted or large uplink SDT data from a buffer state report (BSR).
11 . The first network device of claim 9 , wherein, after the SDT procedure is terminated by the second network device, downlink data transferring between the first network device and the second network device is stopped.
12 . The first network device of claim 9 , wherein the transmitting the first message and the receiving the second message are over an Xn interface.