Cell obtaining method, and terminal

A data processing method, wherein the method is applicable to a Narrowband Internet of Things system comprising a terminal device, a source base station, a target base station and a core network device, wherein the core network device serves both the source base station and the target base station, and wherein the method comprises:

• sending, by the target base station, a first indication message to the core network device, wherein the first indication message is used to indicate that the terminal device completes a cell change or a cell reselection from the source base station to the target base station;
• receiving, by the target base station, downlink data from the core network device, wherein the downlink data is data meant for the terminal device and sent to the source base station that is stored by the core network device during a duration of a first timer, and wherein the first timer is initiated prior to sending the first indication message;
• receiving, by the target base station, feedback information used to indicate a status of receiving the downlink data by the terminal device;
• and
• sending, by the target base station, the feedback information to the core network device,
• wherein the core network can delete the downlink data in response to the feedback information indicating that the terminal device has completely received the downlink data, or the core network can resending the downlink data to the target base station in response to the feedback information indicating that the terminal device did not completely receive the downlink data.

An apparatus of a core network device serving a source base station, a target base station and a terminal device, wherein the apparatus is applicable to the Narrowband Internet of Things, and comprises:

• a processor, configured to start a first timer;
• a memory, configured to store downlink data for the terminal device being sent to the source base station during a duration of the first timer;
• a receiver, configured to receive a first indication message, wherein the first indication message is used to indicate that the terminal device completes a cell change or a cell reselection from the source base station to the target base station;
• and
• a transmitter, configured to:
• send the downlink data to the target base station,
• wherein the receiver is further configured to:
• receive feedback information used to indicate a status of receiving the downlink data by the terminal device, and
• based on the feedback information:
• the processor is further configured to delete the downlink data in response to the feedback information indicating that the terminal device has completely received the downlink data;
• or
• the transmitter is further configured to resend the downlink data to the target base station in response to the feedback information indicating that the terminal device did not completely receive the downlink data.

An apparatus of a target base station, wherein the apparatus is applicable to a Narrowband Internet of Things system comprising the target base station, a source base station, a terminal device and a core network device, wherein the core network device serves both the source base station and the target base station, and wherein the apparatus comprises:

• a transmitter, configured to send a first indication message to the core network device, wherein the first indication message is used to indicate that the terminal device completes a cell change or a cell reselection from the source base station to the target base station;
• and
• a receiver configured to:
• receive downlink data from the core network device, wherein the downlink data is data meant for the terminal device and sent to the source base station that is stored by the core network device during a duration of a first timer, and wherein the first timer is initiated prior to sending the first indication message;
• and
• receive feedback information used to indicate a status of receiving the downlink data by the terminal device,
• wherein the transmitter is further configured to send the feedback information to the core network device, and
• wherein, based on the feedback information, the core network can delete the downlink data in response to the feedback information indicating that the terminal device has completely received the downlink data, or the core network can resending the downlink data to the target base station in response to the feedback information indicating that the terminal device did not completely receive the downlink data.

A non-transitory computer readable medium storing program code for use by a core network device for data processing for a Narrowband Internet of Things system comprising a terminal device, a source base station, a target base station and the core network device, wherein the core network device serves both the source base station and the target base station, and wherein the program code comprises instructions for:

• starting a first timer;
• storing downlink data for the terminal device being sent to the source base station during a duration of the first timer;
• receiving a first indication message, wherein the first indication message is used to indicate that the terminal device completes a cell change or a cell reselection from the source base station to the target base station;
• sending the downlink data stored during the duration of the first timer to the target base station in response to the terminal device establishing a connection to the target base station;
• and
• receiving feedback information used to indicate a status of receiving the downlink data by the terminal device, and
• based on the feedback information:
• deleting the downlink data in response to the feedback information indicating that the terminal device has completely received the downlink data;
• or
• resending the downlink data to the target base station in response to the feedback information indicating that the terminal device did not completely receive the downlink data.

A non-transitory computer readable medium storing program code for use by a target base station for data processing for a Narrowband Internet of Things system comprising a terminal device, a source base station, the target base station and a core network device, wherein the core network device serves both the source base station and the target base station, and wherein the program code comprises instructions for:

• sending a first indication message to the core network device, wherein the first indication message is used to indicate that the terminal device completes a cell change or a cell reselection from the source base station to the target base station;
• and
• receiving downlink data from the core network device, wherein the downlink data is data meant for the terminal device and sent to the source base station that is stored by the core network device during a duration of a first timer, and wherein the first timer is initiated prior to sending the first indication message;
• and
• receiving feedback information used to indicate a status of receiving the downlink data by the terminal device;
• and
• sending the feedback information to the core network device,
• wherein the core network can delete the downlink data in response to the feedback information indicating that the terminal device has completely received the downlink data, or the core network can resending the downlink data to the target base station in response to the feedback information indicating that the terminal device did not completely receive the downlink data.