Communication method and related device
Embodiments of this application provide a communication method and a related device. The method includes: sending, by an access network node, a first message to a terminal; receiving, by the terminal, the first message from the access network node; processing, by the terminal, first information based on the first message, where the first information includes information that needs to be stored in the terminal and a core network node; and/or processing first data based on the first message, where the first data includes data sent to the access network node before the first message from the access network node is received. By using embodiments of this application, a terminal receives paging from a last cell that served the terminal stored in the terminal, and it is ensured that data sent by the terminal to a network side can be successfully sent.
1 . A method comprising:
receiving a first message from an access network node; and
processing, in response to the first message, information about a last cell serving a terminal stored in the terminal, wherein the processing comprises: skipping updating the information about the last cell serving the terminal in response to the first message, wherein the first message comprises first indication information, and the first indication information indicates at least one of following: no connection to a core network node is established; the core network node is unaware of current access of the terminal; or the access network node does not send first data to the core network node.
2 . The method according to claim 1 , wherein the first indication information further indicates at least one of following: radio resource control connection reject; radio resource control connection failure; radio resource control connection release; no radio resource control connection is established; access failure; or access reject.
3 . The method according to claim 1 , wherein after processing the information about the last cell serving the terminal, the method further comprises:
when the terminal is located in a cell corresponding to the information about the last cell serving the terminal, monitoring a wake up signal in the cell, and receiving paging based on the wake up signal.
4 . The method according to claim 1 , wherein after processing the information about the last cell serving the terminal, the method further comprises:
when the terminal is located in a first cell comprising no cell corresponding to the information about the last cell serving the terminal, skipping monitoring a wake up signal.
5 . The method according to claim 1 , wherein the first message is a radio resource control release message.
6 . A method, the method comprising:
sending a first message to a terminal to cause the terminal to process information about a last cell serving the terminal stored in the terminal, wherein processing the information comprises:
skipping updating the information about the last cell serving the terminal in response to the first message, wherein the first message comprises first indication information, and the first indication information indicates at least one of following: no connection to a core network node is established; the core network node is unaware of current access of the terminal; or an access network node does not send first data to the core network node.
7 . The method according to claim 6 , wherein the first indication information further indicates at least one of following: radio resource control connection reject; radio resource control connection failure; radio resource control connection release; no radio resource control connection is established; access failure; or access reject.
8 . The method according to claim 6 , wherein after sending the first message to the terminal, the method further comprises:
receiving a paging message from the core network node, wherein the paging message comprises the information about the last cell serving the terminal; and
using a wake up signal during paging of the terminal in a cell corresponding to the information about the last cell serving the terminal, wherein the wake up signal is to indicate the terminal to receive the paging.
9 . The method according to claim 6 , wherein after sending the first message to the terminal, the method further comprises:
receiving a paging message from the core network node, wherein the paging message comprises the information about the last cell serving the terminal; and
skipping using a wake up signal during paging of the terminal in a first cell comprising no cell corresponding to the information about the last cell serving the terminal, wherein the wake up signal is to indicate the terminal to receive the paging.
10 . The method according to claim 6 , wherein the first message is a radio resource control release message.
11 . An apparatus, the apparatus comprising:
at least one processor; and
at least one non-transitory memory coupled to the at least one processor and storing instructions that, when the instructions are performed by the at least one processor, cause the apparatus to:
receive a first message from an access network node; and
process, in response to the first message, information about a last cell serving a terminal stored in the terminal, wherein the processing comprises:
skipping updating the information about the last cell serving the terminal in response to the first message, wherein the first message comprises first indication information, and the first indication information indicates at least one of following: no connection to a core network node is established; the core network node is unaware of current access of the terminal; or the access network node does not send first data to the core network node.
12 . The apparatus according to claim 11 , wherein the first indication information further indicates at least one of following: radio resource control connection reject; radio resource control connection failure; radio resource control connection release; no radio resource control connection is established; access failure; or access reject.
13 . The apparatus according to claim 11 , wherein the apparatus is further caused to:
after processing the information about the last cell serving the terminal, and when the terminal is located in a cell corresponding to the information about the last cell serving the terminal, monitor a wake up signal in the cell, and receive paging based on the wake up signal.
14 . The apparatus according to claim 11 , wherein the apparatus is further caused to:
after processing the information about the last cell serving the terminal, and when the terminal is located in a first cell comprising no cell corresponding to the information about the last cell serving the terminal, skip monitoring a wake up signal.
15 . The apparatus according to claim 11 , wherein the first message is a radio resource control release message.
16 . An apparatus, the apparatus comprising:
at least one processor; and
at least one non-transitory memory coupled to the at least one processor and storing instructions that, when the instructions are executed by the at least one processor, cause the apparatus to:
determine a first message that causes a terminal to perform:
processing information about a last cell serving the terminal stored in the terminal, wherein the processing comprises:
skipping updating the information about the last cell serving the terminal in response to the first message; and
send the first message to the terminal, wherein the first message comprises first indication information, and the first indication information indicates at least one of following: no connection to a core network node is established; the core network node is unaware of current access of the terminal; or an access network node does not send first data to the core network node.
17 . The apparatus according to claim 16 , wherein the first indication information further indicates at least one of following: radio resource control connection reject; radio resource control connection failure; radio resource control connection release; no radio resource control connection is established; access failure; or access reject.
18 . The apparatus according to claim 16 , wherein the apparatus is further caused to:
receive a paging message from the core network node, wherein the paging message comprises the information about the last cell serving the terminal; and
use a wake up signal during paging of the terminal in a cell corresponding to the information about the last cell serving the terminal, wherein the wake up signal is to indicate the terminal to receive the paging.
19 . The apparatus according to claim 16 , wherein the apparatus is further caused to:
receive a paging message from the core network node, wherein the paging message comprises the information about the last cell serving the terminal; and
skip using a wake up signal during paging of the terminal in a first cell comprising no cell corresponding to the information about the last cell serving the terminal, wherein the wake up signal is to indicate the terminal to receive the paging.
20 . The apparatus according to claim 16 , wherein the first message is a radio resource control release message.