Communication method and related equipment

Abstract

The embodiment of the invention provides a communication method and related equipment, and the method comprises the steps: an access network node transmits a first message to a terminal; the terminal receives a first message from the access network node; the terminal processes first information according to the first message, and the first information comprises information needing to be stored by the terminal and a core network node; and / or processing first data according to the first message, the first data comprising data sent to the access network node before receiving the first message from the access network node. By adopting the embodiment of the invention, the terminal can receive the paging in the last served cell stored by the terminal, and the data sent by the terminal to the network side can be successfully sent.

Description

[0001] This application is a divisional application. The application number of the original application is 202080104169.5, and the original application date is August 5, 2020. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a communication method and related equipment. Background Art

[0003] In the scenario where a wake-up signal (WUS) is used to reduce the power consumption of the user equipment (UE) monitoring paging, the UE is required to monitor the WUS only in the last served cell, and the network side uses the WUS only in the last served cell when paging the UE. In this solution, the UE can only receive the paging of the base station when the last served cell information stored by the UE is consistent with the last served cell information stored by the network side. However, for example, when the core network is overloaded (CN Overload) or in certain scenarios, the base station will trigger the radio resource control release (RRC release), so that the UE is released by the radio resource control, and the base station will not notify the core network of the UE's access, resulting in the last served cell information stored by the UE and the last served cell information stored by the network side. The information is inconsistent, and the UE will not be able to receive the paging of the base station. In addition, when the core network is overloaded (CNOverload), the base station will discard the protocol data unit NAS PDU (Non Access Stratum Protocol Data Unit) or user plane data sent by the UE to the base station. Summary of the invention

[0004] The embodiments of the present application disclose a communication method and related equipment, which can make the last served cell information stored by the terminal consistent with the last served cell information of the terminal stored on the network side, which is beneficial for the terminal to receive paging in the last served cell stored by it, and is beneficial for ensuring that the data sent by the terminal to the network side can be sent successfully.

[0005] A first aspect of an embodiment of the present application discloses a communication method, applied to a terminal, the method comprising: receiving a first message from an access network node; processing first information according to the first message, wherein the first information includes information that needs to be stored by the terminal and the core network node; and / or processing first data according to the first message, wherein the first data includes data sent to the access network node before receiving the first message from the access network node.

[0006] It can be seen that in this embodiment, the terminal receives a first message from an access network node, and then processes the first information according to the first message. Since the first information includes information that needs to be stored by the terminal and the core network node, when the first information is the cell information of the terminal that was last served, the terminal processes the last cell information stored by it, so that the last cell information stored by it is consistent with the last cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last cell served by it, and then receive the paging according to the wake-up signal; or the terminal processes the first data according to the first message. Since the first data includes data sent to the access network node before receiving the first message from the access network node, if the first data is not sent successfully, the terminal can retransmit the first data to the access network node according to the first message, thereby ensuring that the first data can be successfully sent.

[0007] In an exemplary embodiment, the first message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node.

[0008] It can be seen that in this embodiment, the first message includes the first indication information. Since the first indication information is used to indicate at least one of the following: radio resource control connection rejection, radio resource control connection failure; radio resource control connection release; radio resource control connection not established; core network node not connected; core network node not aware of the terminal's current access; access failure; access rejection; access network node not sending the first data to the core network node; therefore, after receiving the first message, the terminal can know that the data sent to the access network node before receiving the first message has not been sent to the core network node. Among them, the first data can be a non-access stratum protocol data unit NAS PDU (Non Access Stratum Protocol Data Unit) or user plane data.

[0009] In an exemplary embodiment, the processing the first data includes retransmitting the first data.

[0010] It can be seen that in this embodiment, when the first data sent by the terminal to the access network node is not sent to the core network node, the terminal can retransmit the first data at the next access based on the first indication information in the first message, which is helpful to ensure that the first data can be sent to the core network node.

[0011] In an exemplary implementation, the first information includes information about the cell that the terminal was last served in. The cell information may be a physical cell identifier, a global cell identifier, a cell identifier, a cell frequency, or a cell index number of the cell.

[0012] It can be seen that in this embodiment, the first information includes the cell information where the terminal was last served. After the terminal receives the first message from the access network node, the terminal learns through the first indication information that the core network node to which it is accessed this time does not know. Therefore, the terminal processes the last served cell information stored according to the first indication information, so that the last served cell information stored by it is consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the cell corresponding to the stored last served cell information, and then receive paging according to the wake-up signal.

[0013] In an exemplary implementation, the processing of the first information includes: not updating the cell information last served by the terminal; or saving the cell information of the last access of the terminal to the access network node as the cell information last served by the terminal.

[0014] It can be seen that in this embodiment, the first information includes the cell information where the terminal was last served. After the terminal receives the first message from the access network node, the terminal learns that the core network node to which it is accessed this time is unknown. Therefore, the terminal does not update the stored last served cell information or save the cell information of the last access to the access network node as the last served cell information, so that the last served cell information stored by it is consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the cell corresponding to the stored last served cell information, and then receive paging according to the wake-up signal.

[0015] In an exemplary embodiment, after processing the first information according to the first message, the method further includes: if the terminal is located in a cell corresponding to the cell information last served by the terminal, monitoring the wake-up signal and receiving paging according to the wake-up signal; if the terminal is located in a first cell, not monitoring the wake-up signal, wherein the first cell does not include the cell corresponding to the cell information last served by the terminal.

[0016] It can be seen that in this embodiment, if the terminal is located in the last served cell stored in its storage, it monitors the wake-up signal and receives paging based on the wake-up signal; if the terminal is located in a cell other than the last served cell stored in its storage, it does not monitor the wake-up signal; since the wake-up signal is monitored in the last served cell stored in the terminal, the terminal monitors the paging only after detecting the wake-up signal, which is beneficial to reducing the terminal monitoring paging overhead.

[0017] In an exemplary implementation, the first message includes a radio resource control release message.

[0018] It can be seen that in this embodiment, the access network node sends a wireless resource control release message to the terminal, which is used to instruct the terminal to release the wireless resource control connection, so that the terminal learns that its current access to the core network node is unknown, and after releasing the wireless resource control connection, the terminal processes the last served cell information stored by it, for example, does not update the last served cell information stored by it; so that the last served cell information stored by it is consistent with the last served cell information of the terminal stored by the core network node.

[0019] In an exemplary implementation, the first indication information includes a radio resource control release cause (RRC release cause).

[0020] It can be seen that in this embodiment, since the paging process is that the core network node sends the last served cell information of the terminal to be paged to the access network node, and then the access network node uses a wake-up signal when initiating paging in the cell where the terminal was last served, if the indication information in the wireless resource control release message indicates that when the wireless resource control is released, the access network node did not report the service cell information of the terminal's current access to the core network node, then in order to receive the paging of the access network node, the terminal will not update its own stored last served cell information, so that the terminal side stored The terminal side’s last served cell information is consistent with the terminal’s last served cell information stored on the core network node side.

[0021] In an exemplary embodiment, the method further includes: sending a second message to the access network node, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports control plane cellular Internet of Things (CP CIoT) or whether the terminal supports user plane cellular Internet of Things (UP CIoT).

[0022] It can be seen that in this embodiment, the terminal can send a second message to the access network node. Since the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things, the access network node can obtain information through the second message about whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; because when the core network node is overloaded, it does not accept access from terminals that only support the control plane cellular Internet of Things or do not support the user plane cellular Internet of Things, so that the access network node can determine whether to accept the access of the terminal through the second indication information in the second message.

[0023] In an exemplary embodiment, the receiving of the first message from the access network node includes: if the core network node is overloaded and the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, then receiving the wireless resource control release message from the access network node.

[0024] It can be seen that in this embodiment, when the core network node is overloaded, it does not accept access from terminals that only support control plane cellular Internet of Things or do not support user plane cellular Internet of Things. If the access network node knows that the terminal only supports control plane cellular Internet of Things or does not support user plane cellular Internet of Things, the access network node will send a wireless resource control release message to the terminal, thereby refusing to accept access from the terminal.

[0025] A second aspect of an embodiment of the present application discloses a communication method, which is applied to an access network node, and the method includes: sending a first message to a terminal, wherein the first message is used by the terminal to process first information, and the first information includes information that needs to be stored by the terminal and the core network node; and / or the first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal.

[0026] In an exemplary embodiment, the first message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node.

[0027] In an exemplary embodiment, the processing the first data includes retransmitting the first data.

[0028] In an exemplary implementation, the first information includes information about the cell that the terminal was last served by.

[0029] In an exemplary implementation, the processing of the first information includes: not updating the cell information last served by the terminal; or saving the cell information of the last access of the terminal to the access network node as the cell information last served by the terminal.

[0030] In an exemplary embodiment, after sending a first message to the terminal, the method further includes: receiving a paging message from a core network node, wherein the paging message includes information about the cell last served by the terminal; using a wake-up signal when paging the terminal in a cell corresponding to the cell information last served by the terminal, and not using a wake-up signal when paging the terminal in a first cell, wherein the wake-up signal is used to indicate that the terminal receives paging, and the first cell does not include the cell corresponding to the cell information last served by the terminal.

[0031] In an exemplary implementation, the first message includes a radio resource control release message.

[0032] In an exemplary implementation, the first indication information includes a radio resource control release reason.

[0033] In an exemplary embodiment, the method also includes: receiving an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted; receiving a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0034] It can be seen that in this embodiment, when the core network node is overloaded, it can send an overload start message to the access network node, indicating that the terminal that only supports the control plane cellular Internet of Things is not accepted for access; in addition, the access network node can receive a second message from the terminal. Since the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; the access network node can determine whether to accept the access of the terminal when the core network node is overloaded through the second indication information in the second message.

[0035] In an exemplary embodiment, sending the first message to the terminal includes: if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, sending the wireless resource control release message to the terminal.

[0036] The third aspect of an embodiment of the present application discloses a communication method, which is applied to an access network node, and the method includes: sending a wireless resource control release message to a terminal and sending a first S1 interface application protocol (S1AP) message or a first NG interface application protocol (NGAP) message to a core network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time.

[0037] It can be seen that in this embodiment, the access network node sends a wireless resource control release message to the terminal. After receiving the wireless resource control release message, the terminal will release the wireless resource control connection and update the last served cell information stored in it, that is, save the cell information of the current access to the access network node as the last served cell information; in addition, the access network node will also send the cell information of the terminal's current access to the access network node to the core network node through the first S1 interface application protocol message or the first NG interface application protocol message, so that the last served cell information stored by the terminal can be consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored in it, and then receive paging according to the wake-up signal.

[0038] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal.

[0039] It can be seen that in this embodiment, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with the terminal between the core network and the access network. Therefore, in this embodiment, even if the S1 interface association or NG interface association with the terminal is not established or activated between the core network and the access network, the access network node can send the cell information of the terminal accessing the access network node to the core network node.

[0040] In an exemplary embodiment, the method also includes: receiving an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted; receiving a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0041] It can be seen that in this embodiment, when the core network node is overloaded, it can send an overload start message to the access network node, indicating that the terminal that only supports the control plane cellular Internet of Things is not accepted for access; in addition, the access network node can receive a second message from the terminal. Since the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; the access network node can determine whether to accept the access of the terminal when the core network node is overloaded through the second indication information in the second message.

[0042] In an exemplary embodiment, the sending of a wireless resource control release message to the terminal and the sending of a first S1 interface application protocol message or a first NG interface application protocol message to the core network node include: if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, then sending a wireless resource control release message to the terminal and sending a first S1 interface application protocol message or a first NG interface application protocol message to the core network node.

[0043] It can be seen that in this embodiment, when the core network node is overloaded and the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node sends a wireless resource control release message to the terminal to refuse to accept the access of the terminal, so that the terminal releases the wireless resource control connection and saves the cell information of this access to the access network node as the last served cell information; and the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node to send the cell information of the terminal's current access to the access network node to the core network node for storage, so that the last served cell information stored by the terminal is consistent with the last served cell information of the terminal stored by the core network node.

[0044] In an exemplary embodiment, the wireless resource control release message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send first data to the core network node, wherein the first data includes data sent by the terminal to the access network node.

[0045] It can be seen that in this embodiment, the wireless resource control release message includes the first indication information. Since the first indication information is used to indicate at least one of the following: wireless resource control connection rejection, wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; core network node not connected; core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node; therefore, after receiving the wireless resource control release message, the terminal can know that the data sent to the access network node before receiving the wireless resource control release message has not been sent to the core network node.

[0046] In an exemplary implementation, the first indication information is used by the terminal to process first data, where the first data includes data received from the terminal before a radio resource control release message is sent to the terminal.

[0047] It can be seen that in this embodiment, when the first data sent by the terminal to the access network node is not sent to the core network node, the terminal can retransmit the first data to the access network node according to the first message, which is conducive to ensuring that the first data can be sent to the core network node.

[0048] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message further includes an identifier of the terminal.

[0049] It can be seen that in this embodiment, when the access network node sends the updated information of the cell where the terminal was last served to the core network node, the access network node also sends the identifier of the terminal to the core network node. The core network node can store the information of the cell where the terminal was last served and the identifier of the terminal in association; when it is necessary to page the terminal, the core network node can accurately send the information of the cell where the terminal was last served to the access network node through the stored identifier of the terminal, thereby facilitating the access network node to use a wake-up signal when initiating paging in the cell where the terminal was last served, and the terminal successfully receives the paging from the access network node.

[0050] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message includes a Retrieve UE Information message.

[0051] It can be seen that in this implementation, the access network node uses an existing message (ie, Retrieve UE Information) on the S1 interface application protocol or the NG interface application protocol to send the cell information last served by the terminal to the core network node.

[0052] A fourth aspect of an embodiment of the present application discloses a communication method, which is applied to a core network node, and the method includes: receiving a first S1 interface application protocol message or a first NG interface application protocol message from an access network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes cell information of a terminal accessing the access network node this time, and the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; and storing the cell information of the terminal accessing the access network node this time.

[0053] It can be seen that in this embodiment, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with the terminal between the core network and the access network. Therefore, in this implementation manner, even if the S1 interface association or NG interface association with the terminal is not established or activated between the core network and the access network, the access network node can send the cell information of the terminal accessing the access network node to the core network node.

[0054] The fifth aspect of an embodiment of the present application discloses a communication method, which is applied to an access network node, and the method includes: receiving a wireless resource control connection request message from a terminal; sending a second S1 interface application protocol message or a second NG interface application protocol message to a core network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal; receiving a third S1 interface application protocol message or a third NG interface application protocol message from the core network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports a control plane cellular Internet of Things or whether the terminal supports a user plane cellular Internet of Things; if the terminal only supports a control plane cellular Internet of Things or the terminal does not support a user plane cellular Internet of Things, sending a wireless resource control connection rejection message to the terminal.

[0055] It can be seen that in this embodiment, after receiving the wireless resource control connection request message of the terminal, the access network node will send a second S1 interface application protocol message or a second NG interface application protocol message to the core network node, and inform the core network node of the terminal identifier; the core network node can determine whether the terminal is a terminal that only supports the control plane cellular Internet of Things or whether it is a terminal that supports the user plane cellular Internet of Things through the identifier of the terminal; then the core network node sends a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, and informs the core network node of whether the terminal is a terminal that only supports the control plane cellular Internet of Things or whether it is a terminal that supports the user plane The result of the terminal of the cellular Internet of Things is notified to the access network node; if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node directly rejects the wireless resource control connection request of the terminal; since the wireless resource control connection request initiated by the terminal is rejected, the terminal does not successfully access the network, then the terminal will not update its stored last served cell information, so that the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0056] In an exemplary embodiment, the method further includes: receiving an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports control plane cellular Internet of Things is not accepted.

[0057] It can be seen that in this embodiment, when the core network node is overloaded, it can send an overload start message to the access network node, indicating that it does not accept access from terminals that only support the control plane cellular Internet of Things. Therefore, when the access network node determines that the terminal only supports the control plane cellular Internet of Things, it sends a wireless resource control connection rejection message to the terminal to reject the access of the terminal.

[0058] The sixth aspect of an embodiment of the present application discloses a communication method, which is applied to a core network node, and the method includes: receiving a second S1 interface application protocol message or a second NG interface application protocol message from an access network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of a terminal; sending a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports a control plane cellular Internet of Things or whether the terminal supports a user plane cellular Internet of Things.

[0059] It can be seen that in this embodiment, the access network sends the terminal identifier to the core network node through the second S1 interface application protocol message or the second NG interface application protocol message, and the core network node can inform the access network node through the third S1 interface application protocol message or the third NG interface application protocol message whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0060] In an exemplary implementation, the second S1 interface application protocol message or the second NG interface application protocol message, and the third S1 interface application protocol message or the third NG interface application protocol message, do not establish or activate the S1 interface association or NG interface association of the terminal.

[0061] It can be seen that in this implementation manner, the second S1 interface application protocol message or the second NG interface application protocol message, and the third S1 interface application protocol message or the third NG interface application protocol message, do not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the second S1 interface application protocol message or the second NG interface application protocol message and the third S1 interface application protocol message or the third NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with respect to the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with respect to the terminal between the core network and the access network. Therefore, in this implementation manner, even if the S1 interface association or NG interface association with respect to the terminal is not established or activated between the core network and the access network, the access network node can still send the terminal identifier to the core network node, and the core network node can also send the third indication information used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things to the access network node.

[0062] The seventh aspect of an embodiment of the present application discloses a communication method, which is applied to a terminal, and the method includes: sending first data to the access network node so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node; and does not update the stored information of the last served cell.

[0063] It can be seen that in this embodiment, the terminal quickly accesses the access network node and sends the first data to the access network node, so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node, thereby realizing the transmission of data to the core network; since the access network node does not send an application protocol message to the core network control plane node, that is, the access network node does not send the cell information of the terminal's quick access this time to the core network control plane node, the core network stores the last served cell information of the terminal or the cell information of the last access, so the terminal does not update the stored last served cell information, that is, the terminal does not store the cell information of this quick access as the last served cell information; thus, the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0064] In an exemplary implementation, before or while sending the first data to the access network node, the method further includes: triggering fast access to the access network node.

[0065] It can be seen that in this embodiment, before or while sending the first data to the access network node, the terminal triggers fast access to the access network node, that is, the terminal quickly accesses the access network node, thereby facilitating the transmission of the first data to the core network through fast access.

[0066] In an exemplary implementation, the fast access includes small packet transmission, early data transmission, two-step random access, and resource reservation access.

[0067] It can be seen that in this implementation, fast access includes small packet transmission, early data transmission, two-step random access, and resource reservation access, so that the terminal can transmit the first data to the core network in a variety of ways.

[0068] An eighth aspect of an embodiment of the present application discloses a communication device, applied to a terminal, the device comprising: a receiving unit, for receiving a first message from an access network node; a processing unit, for processing first information according to the first message, wherein the first information includes information that needs to be stored by the terminal and the core network node; and / or processing first data according to the first message, wherein the first data includes data sent to the access network node before receiving the first message from the access network node.

[0069] A ninth aspect of an embodiment of the present application discloses a communication device, which is applied to an access network node, and the device includes: a sending unit, which is used to send a first message to a terminal, wherein the first message is used by the terminal to process first information, and the first information includes information that needs to be stored by the terminal and the core network node; and / or the first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal.

[0070] The tenth aspect of an embodiment of the present application discloses a communication device, which is applied to an access network node, and the device includes: a sending unit, which is used to send a wireless resource control release message to a terminal and send a first S1 interface application protocol message or a first NG interface application protocol message to a core network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time.

[0071] In an eleventh aspect of an embodiment of the present application, a communication device is disclosed, which is applied to a core network node, and the device includes: a receiving unit, used to receive a first S1 interface application protocol message or a first NG interface application protocol message from an access network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time, and the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; a storage unit, used to store the cell information of the terminal accessing the access network node this time.

[0072] The twelfth aspect of an embodiment of the present application discloses a communication device, which is applied to an access network node, and the device includes: a receiving unit, which is used to receive a wireless resource control connection request message from a terminal; a sending unit, which is used to send a second S1 interface application protocol message or a second NG interface application protocol message to a core network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal; the receiving unit is also used to receive a third S1 interface application protocol message or a third NG interface application protocol message from the core network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports a control plane cellular Internet of Things or whether the terminal supports a user plane cellular Internet of Things; the sending unit is also used to send a wireless resource control connection rejection message to the terminal if the terminal only supports a control plane cellular Internet of Things or the terminal does not support a user plane cellular Internet of Things.

[0073] The thirteenth aspect of an embodiment of the present application discloses a communication device, which is applied to a core network node, and the device includes: a receiving unit, used to receive a second S1 interface application protocol message or a second NG interface application protocol message from an access network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of a terminal; a sending unit, used to send a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports a control plane cellular Internet of Things or whether the terminal supports a user plane cellular Internet of Things.

[0074] The fourteenth aspect of an embodiment of the present application discloses a communication device, which is applied to a terminal, and the device includes: a sending unit, which is used to send first data to the access network node through fast access, so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node; a processing unit, which is used to not update the stored last served cell information.

[0075] A fifteenth aspect of an embodiment of the present application discloses a terminal, comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing the steps in the method described in any one of the first aspect or the seventh aspect above.

[0076] A sixteenth aspect of an embodiment of the present application discloses an access network node, comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing the steps in the method described in any one of the second aspect, the third aspect, or the fifth aspect above.

[0077] A seventeenth aspect of an embodiment of the present application discloses a core network node, comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing the steps in the method described in any one of the fourth or sixth aspects above.

[0078] An eighteenth aspect of an embodiment of the present application discloses a chip, characterized in that it includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes a method as described in any one of the first to seventh aspects above.

[0079] A nineteenth aspect of an embodiment of the present application discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program enables a computer to execute a method as described in any one of the first to seventh aspects above.

[0080] The twentieth aspect of the embodiments of the present application discloses a computer program product, which enables a computer to execute the method as described in any one of the first to seventh aspects above. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 This is a message sending schematic diagram provided by an embodiment of the present application;

[0082] Figure 2 This is a schematic diagram of an air interface access process provided by an embodiment of the present application;

[0083] Figure 3 is a schematic diagram of a wake-up signal provided in an embodiment of the present application;

[0084] Figure 4 It is a schematic diagram of the architecture of an E-UTRAN system provided in an embodiment of the present application;

[0085] Figure 5 It is a schematic diagram of the architecture of a radio access network (NG-RAN) system provided in an embodiment of the present application;

[0086] Figure 6 It is a flow chart of a communication method provided in an embodiment of the present application;

[0087] Figure 7 It is a flowchart of another communication method provided in an embodiment of the present application;

[0088] Figure 8 It is a flowchart of another communication method provided in an embodiment of the present application;

[0089] Fig. 9 It is a flowchart of another communication method provided in an embodiment of the present application;

[0090] Fig.10 It is a flowchart of another communication method provided in an embodiment of the present application;

[0091] Fig.11 It is a flowchart of another communication method provided in an embodiment of the present application;

[0092] Fig.12 It is a flowchart of another communication method provided in an embodiment of the present application;

[0093] Fig.13is a structural diagram of a communication device provided in an embodiment of the present application;

[0094] Fig.14 is a structural diagram of another communication device provided in an embodiment of the present application;

[0095] Fig.15 is a structural diagram of another communication device provided in an embodiment of the present application;

[0096] Fig.16 is a structural diagram of another communication device provided in an embodiment of the present application;

[0097] Fig.17 is a structural diagram of another communication device provided in an embodiment of the present application;

[0098] Fig.18 is a structural diagram of another communication device provided in an embodiment of the present application;

[0099] Fig.19 is a structural diagram of another communication device provided in an embodiment of the present application;

[0100] Fig. 20 is a schematic diagram of the structure of a terminal provided in an embodiment of the present application;

[0101] Fig.21 It is a structural diagram of an access network node provided in an embodiment of the present application;

[0102] Fig. 22 It is a structural diagram of a core network node provided in an embodiment of the present application. DETAILED DESCRIPTION

[0103] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0104] The terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0105] Reference to "embodiments" in this specification means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this specification may be combined with other embodiments.

[0106] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, future fifth generation (5G) system or new radio (NR), etc.

[0107] The terminal in the embodiments of the present application may refer to a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The terminal may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a relay device, a vehicle-mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved public land mobile communication network (PLMN), etc., and the embodiments of the present application are not limited to this.

[0108] The network device in the embodiment of the present application can be a device for communicating with a terminal. The network device can be a base station (base transceiver station, BTS) in a global system for mobile communications (GSM) system or code division multiple access (CDMA), or a base station (NodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolved base station (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay device, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU), etc., and the embodiment of the present application is not limited.

[0109] In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. The AAU implements some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or by the DU+AAU. It can be understood that the network device can be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU may be divided into a radio access network (RAN) node, or may be divided into a core network (CN) node, which is not limited in the present application.

[0110] The access network node in the embodiment of the present application is mainly responsible for the wireless resource management, quality of service (QoS) management, data compression and encryption and other functions on the air interface side. The access network node may include various forms of base stations, such as macro base stations, micro base stations (also called small stations), relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, in the fifth generation (5th generation, 5G) system, it is called gNB; in the LTE system, it is called evolved node B (evolved nodeB, eNB or eNodeB); in the third generation (3rd generation, 3G) system, it is called node B (node ​​B), etc. The embodiment of the present application does not limit this.

[0111] The core network node in the embodiment of the present application is used to provide user connection, user management and service bearing. For example, the establishment of user connection includes functions such as mobility management (MM) and paging. User management includes user description, QoS, and security (the corresponding security measures provided by the authentication center include security management of mobile services and security processing of external network access). Bearer connections include external public switched telephone networks (PSTN), external circuit data networks and packet data networks, the Internet, etc. For example, the core network node can be an access and mobility management function (AMF) entity, which is mainly responsible for the signaling processing part, that is, the control plane function, including access control, mobility management, attachment and detachment, and gateway selection. The core network nodes involved in the embodiments of the present application are not limited to AMF.

[0112] In order to facilitate the understanding of the present application, the relevant technical knowledge involved in the embodiments of the present application is first introduced here.

[0113] Control plane CIoT 5GS Optimisation: It can support efficient transmission of user data (IP, Ethernet and unstructured) or SMS messages on the control plane through AMF without triggering the establishment of user plane resources as defined in TS24.501.

[0114] Controlplane CIoT EPS optimisation: It can support efficient transmission of user data (IP, non-IP or SMS) on the control plane through the MME without triggering the establishment of data radio bearers as defined in TS24.301.

[0115] See also Figure 1 , Figure 1It is a message sending schematic diagram provided in an embodiment of the present application. The Rel-14 LTE system introduces core network overload control for UEs that only support control plane CIoT EPS optimization. That is, the Mobility Management Entity (MME) sends an overload start (Overload Start) message to the base station (eNB), indicating that the base station does not accept the access request of the Radio Resource Control (Radio Resource Control, RRC) connection establishment cause value (establishmentCause (-NB)) of the UE (CP CIoT UE) that only supports the control plane cellular Internet of Things (Cellular Internet of Things, CP CIoT) as "Calling data service (mo-data)" or "Delay Tolerant Access Service (delayTolerantAccess)".

[0116] TS 36.413 stipulates that: if the Overload Action IE in the Overload Response IE in the Overload Start message is set to: do not accept the RRC connection request of the UE that only supports the control plane CIoT EPS optimization for data transmission, that is, do not accept the UE access request whose corresponding RRC connection establishment cause value in TS36.331

[16] is "Calling Data Service (mo-data)" or "Delay Tolerant Access Service (delayTolerantAccess)"; or, if the Overload Start message contains the Traffic Load Reduction Indication IE, and if supported, indicates a percentage of rejection to reduce the signaling traffic, then the UE access request is not accepted, otherwise, ensure that only the signaling traffic that is not indicated as rejected / not accepted is sent to the MME.

[0117] TS23.401 stipulates that the MME can use the Overload Start message to request the base station (eNodeB) not to accept UE access requests with the RRC connection establishment cause value of "calling data service (mo-data)" or "delay tolerant access service (delayTolerantAccess)".

[0118] See also Figure 2 , Figure 2 FIG. 1 is a flow chart of an air interface access process provided by an embodiment of the present application. Figure 2As shown in the figure, the air interface access process of the UE (CP CIoT UE) that only supports the control plane cellular Internet of Things is: the UE sends a random access preamble (Random Access Preamble) to the base station; the base station sends a random access response (Random Access Response) information to the UE; the UE sends a radio resource control connection request (RRCConnectionRequest, commonly referred to as msg3) information to the base station; the base station sends a radio resource control connection establishment (RRCConnectionSetup) message to the UE; the UE sends a radio resource control connection establishment completion (RRCConnectionSetupComplete, commonly referred to as msg5) message to the base station, thereby realizing the air interface access of the UE.

[0119] In the radio resource control connection request message, the UE will carry the RRC connection establishment cause value, and the base station can determine whether the RRC connection establishment cause value is "calling data service (mo-data)" or "delay tolerant access service (delayTolerantAccess)"; in the radio resource control connection establishment completion message, the UE will inform the base station whether it supports the user plane CIoT EPS optimization (User Plane CIoT EPS optimization), so the base station can determine whether the UE is a UE that only supports the control plane cellular Internet of Things. Note that in the CP CIoT solution, msg5 will carry a non-access layer protocol data unit (NAS PDU).

[0120] When a narrowband Internet of Things (NB-IoT) UE supports user plane (S1-U) or user plane (UP) cellular Internet of Things (CIoT) optimization (UP CIoT opt), user plane (UP) cellular Internet of Things (CIoT) EPS optimization information (up-CIoT-EPS-Optimization) will be indicated.

[0121] Enhanced Machine Type Communication (eMTC) / LTE UEs support at least S1-U by default, so there is no such thing as only supporting CPCIoT.

[0122] Therefore, when the base station receives the relevant overload start (Overload Start) message sent by the MME, if the establishment reason value of the UE in msg3 is "calling data service (mo-data)" or "delay tolerant access service (delayTolerantAccess)", and indicates in msg5 that it only supports CP CIoT, the base station will send an RRC release message to the UE to release the air interface connection.

[0123] However, for UEs that only support NB-IoT (NB-IOT CP only UE), when the UE sends data to the base station through the Non Access Stratum (NAS) information in msg5, the base station triggers the radio resource control (connection) release (RRC release) due to core network overload, and the NAS packet sent by the UE to the base station will be discarded by the base station without the UE knowing. Note that since the overload action is only applicable to EPS, this problem is limited to NB-IOTCP only UE under EPS.

[0124] In this scenario, the base station needs to tell the UE that the NAS PDU is not sent to the core network; or it needs to tell the UE that the access is rejected because the core network is overloaded; or it needs to tell the UE that no message is sent to the MME for this access.

[0125] See also Figure 3 , Figure 3 It is a schematic diagram of a wake-up signal provided in an embodiment of the present application. The wake-up signal is a method for reducing the user monitoring paging overhead. Originally, the UE needs to monitor the Physical Downlink Control Channel (PDCCH) in each paging cycle, so the overhead is relatively large. A WUS signal is introduced before each paging occasion (Paging Occasion, PO). The UE monitors the WUS signal. If the WUS signal is detected, it needs to monitor the PDCCH channel. If the WUS signal is not detected, the PDCCH channel corresponding to this PO is not monitored. In addition, for UEs using extended discontinuous reception (eDRX), one WUS signal can correspond to multiple POs, that is, if this WUS signal is not detected, the subsequent multiple POs are skipped. Figure 3 In the figure, one WUS signal corresponds to four POs for example.

[0126] In order to reduce the paging false alarms of UEs using WUS in surrounding cells, the standard further introduces the last cell solution, that is, for a UE, it only monitors WUS when it is still in the cell where it is released by RRC; for the network side, the base station sends the information of the last cell where the UE is located to the MME or AMF of the core network (CN) in the UE context release completion message on the wireless node and core network interface (S1 / NG interface); in the subsequent paging message triggered by the core network, the MME or AMF sends the last cell information to the base station, and the base station only uses WUS for the UE in the last cell. In other words, the UE only listens to WUS in the last cell where it is served (that is, the cell where RRC release is performed), and the base station only uses WUS when paging the UE in the cell where the UE is last served. When the core network triggers paging, it tells the base station the last cell information. It should be noted that when the core network sends a paging message to the base station, the base station does not know which UE it previously served. Therefore, the base station needs to send the last cell information to the core network at the end of the last UE access. The core network then needs to provide the last cell information to the base station when sending a paging message to the base station.

[0127] The Radio Access Network (RAN) and the UE can use WUS to reduce the idle mode power consumption of the UE. The RAN sends a WUS shortly before the UE is paged, and the WUS function enables the UE to determine that in the paging occasion immediately following the WUS occasion it monitors, if the RAN does not send a WUS to the UE, the RAN will not be paged, or if the RAN sends a WUS to the UE, the RAN may be paged (see TS 36.304

[34] ).

[0128] To avoid waking up the UE due to the MME paging other UEs across multiple cells (e.g. due to frequent UE mobility and / or due to low paging latency services such as VoLTE (Voice over LTE)), the eNB and UE can only use the cell used by the WUS, i.e. the cell of the UE's last RRC release. To support this:

[0129] a) An eNB supporting WUS shall provide the MME with the recommended cell and eNB paging IEs in the S1 UE CONTEXT RELEASE COMPLETE or UE CONTEXT SUSPENSION REQUEST message (see TS 36.413

[36] ).

[0130] b) The MME no longer provides (unmodified) the recommended cell as auxiliary data of the Secondary Cell IE in the S1-AP Paging message to the RAN if it was received during the previous S1 UE CONTEXT RELEASE COMPLETE or UE CONTEXT SUSPENSION REQUEST message (see TS 36.413

[36] ).

[0131] c) When a new S1-AP association is established for a UE, the MME shall delete (or mark as invalid) the information about the recommended cells and eNBs for paging.

[0132] In the S1-AP Paging message, the last used cell ID is sent in the "Assistance Data of Recommended Cells IE" in the Assistance Data of the Paging IE (see TS 36.413

[36] ). Upon receiving an S1-AP Paging message from a WUS-capable UE that also includes the Assistance Data of the Recommended Cells IE, the WUS-capable eNB shall broadcast WUS only on the cell that matches the last used cell ID.

[0133] Considering that when the UE is RRC released, the base station does not establish the S1 association of the UE with the core network (CN) (connected via the S1 interface), the last cell solution in this scenario will cause the last cell information stored by the UE to be inconsistent with the last cell information stored by the core network, so that the UE will not be able to receive paging. That is, if the base station does not establish the S1 association of the UE with the core network when the UE is RRC released, and the base station does not report the last cell information to the core network, the last cell information stored by the UE will be inconsistent with the last cell information stored by the core network, so that the UE will not be able to receive paging. It should be noted that the same problem also exists for other scenarios where RRC release but no S1 / NG message (message transmitted via the S1 / NG interface) exists (for example, small data transmission).

[0134] Therefore, it is necessary to make the last cell information stored by the UE consistent with the last cell information stored by the network side to avoid the situation where the UE monitors the WUS at the last cell (cell-A) stored by itself, while the network thinks that the last cell of the UE is cell-B. As a result, the base station will not use the WUS for the UE in the paging of cell-A, and the UE will not receive the paging.

[0135] The technical solution provided in this application is applicable to wireless communication networks, such as E-UTRAN system or NG-RAN system.

[0136] See also Figure 4 , Figure 4 This is an architectural diagram of an E-UTRAN system provided in an embodiment of the present application. The E-UTRAN system includes an access network node and a core network node, wherein the access network node may include multiple base stations (eNBs), and the core network node may include multiple MMEs or serving gateways (SeveringGateway, S-GW). The base stations are connected through an X2 interface, and the base stations and MMEs or S-GWs are connected through an S1 interface.

[0137] See also Figure 5 , Figure 5 This is an architectural diagram of an NG-RAN system provided in an embodiment of the present application, wherein the NG-RAN system includes an access network node and a core network node, wherein the access network node may include multiple NG-RAN nodes, the NG-RAN node may be a gNB and an ng-eNB, the core network node may include multiple AMF or user plane function (UPF) entities, the NG-RAN nodes are connected through an Xn interface, and the NG-RAN node is connected to the AMF or UPF through an NG interface.

[0138] It should be noted that the above Figure 4 and Figure 5 In the two architectures provided, both eNB and ng-eNB can provide NB-IoT cells.

[0139] The technical solution provided by this application is introduced in detail below in conjunction with specific implementation methods.

[0140] See also Figure 6 , Figure 6 This is a flow chart of a communication method provided by an embodiment of the present application, which includes but is not limited to the following steps:

[0141] Step 601: An access network node sends a first message to a terminal.

[0142] Step 602: The terminal receives a first message from the access network node.

[0143] Step 603: The terminal processes first information according to the first message, wherein the first information includes information that needs to be stored by the terminal and the core network node; and / or processes first data according to the first message, wherein the first data includes data sent to the access network node before receiving the first message from the access network node.

[0144] Among them, the first message can be a wireless resource control release message, but the first message is not limited to this, and can also be other messages; in addition, the first message can carry indications, such as indicating that the core network node is overloaded, the first data is not sent to the core network node, etc.

[0145] Among them, the embodiments of the present application can be applied to the scenario of control plane cellular Internet of Things, but are not limited to this.

[0146] It should be noted that the purpose of the terminal processing the first information according to the first message is to make the first information stored in the terminal consistent with the first information stored in the core network node.

[0147] The first information may be information about the cell that the terminal was last served by, but the first information is not limited to information about the cell that the terminal was last served by, and may also be other information that needs to be kept consistent between the terminal side and the network side, such as the last access time information.

[0148] The first data may be data sent by the terminal to the access network node through the radio resource control connection establishment completion information. Since the access network node may not send the first data to the core network node after the terminal sends the first data to the access network node, the terminal processing the first data according to the first message may be the terminal retransmitting the first data to the access network node.

[0149] It can be seen that in this embodiment, the terminal receives a first message from an access network node, and then processes the first information according to the first message. Since the first information includes information that needs to be stored by the terminal and the core network node, when the first information is the cell information of the terminal that was last served, the terminal processes the last cell information stored by it, so that the last cell information stored by it is consistent with the last cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last cell served by it, and then receive the paging according to the wake-up signal; or the terminal processes the first data according to the first message. Since the first data includes data sent to the access network node before receiving the first message from the access network node, if the first data is not sent successfully, the terminal can retransmit the first data to the access network node according to the first message, thereby ensuring that the first data can be successfully sent.

[0150] In an exemplary embodiment, the first message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node.

[0151] Specifically, the first indication information may include but is not limited to: the access network node rejects the wireless resource control connection of the terminal; the wireless resource control connection of the terminal fails; the wireless resource control connection is rejected due to congestion; the wireless resource control connection is released due to congestion; the terminal is not connected to the core network node this time; the core network node is not aware of the terminal's access this time; access failure; access rejection; the current wireless resource control connection is not established; data sent by the terminal to the access network node is not sent to the core network node by the access network node; data sent by the terminal to the access network node is discarded by the access network node.

[0152] For example, if the MME or AMF is not aware of the UE's access to the base station this time, it means that the base station has not sent the cell information of the UE's access to the MME or AMF, that is, the cell information of the UE's last service stored in the MME or AMF is still the cell information of the UE's last access to the network. When the core network triggers a paging message, the MME or AMF sends the cell information of the UE's last access to the network to the base station. The base station only uses the WUS for the UE in the cell where the UE last accessed the network, so that the UE cannot monitor the WUS and cannot receive the paging of the base station. If the base station informs the UE through an indication message that the MME or AMF is not aware of the UE's access to the base station this time, the UE knows that the MME or AMF will not save the cell information of the UE's access to the network this time, that is, the UE knows that the cell information of the UE's last service stored in the MME or AMF is still the cell information of the UE's last access to the network. In order to receive the paging of the base station, the UE does not update the cell information of the last service. In this way, after the RRC connection is released, the cell information of the last service saved by the UE is still the cell information of the UE's last access to the network.

[0153] It can be seen that in this embodiment, the first message includes the first indication information. Since the first indication information is used to indicate at least one of the following: radio resource control connection rejection, radio resource control connection failure; radio resource control connection release; radio resource control connection not established; core network node not connected; core network node not aware of the terminal's current access; access failure; access rejection; access network node not sending the first data to the core network node; therefore, after receiving the first message, the terminal can know that the data sent to the access network node before receiving the first message has not been sent to the core network node. Among them, the first data can be a non-access stratum protocol data unit NAS PDU (Non Access Stratum Protocol Data Unit) or user plane data.

[0154] In an exemplary embodiment, the processing the first data includes retransmitting the first data.

[0155] It can be seen that in this embodiment, when the first data sent by the terminal to the access network node is not sent to the core network node, the terminal can retransmit the first data at the next access based on the first indication information in the first message, which is helpful to ensure that the first data can be sent to the core network node.

[0156] In an exemplary implementation, the first information includes information about the cell that the terminal was last served in. The cell information may be a physical cell identifier, a global cell identifier, a cell identifier, a cell frequency, a cell index number, etc. of the cell.

[0157] It should be noted that, in the last served cell solution, the access network node only uses the wake-up signal in the cell where the terminal was last served and stored by the core network node, and the terminal only monitors the wake-up signal in the cell where the terminal was last served and stored. That is, the terminal can only monitor the wake-up signal when the cell where the terminal was last served and the cell where the terminal was last served and stored by the network side are the same cell. Then, after the terminal monitors the wake-up signal in the cell where the terminal was last served and stores the wake-up signal, it monitors the paging of the access network node according to the wake-up signal.

[0158] It can be seen that in this embodiment, the first information includes the cell information where the terminal was last served. After the terminal receives the first message from the access network node, the terminal learns through the first indication information that the core network node to which it is accessed this time does not know. Therefore, the terminal processes the last served cell information stored according to the first indication information, so that the last served cell information stored by it is consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the cell corresponding to the stored last served cell information, and then receive the paging according to the wake-up signal.

[0159] In an exemplary implementation, the processing of the first information includes: not updating the cell information last served by the terminal; or saving the cell information of the last access of the terminal to the access network node as the cell information last served by the terminal.

[0160] It should be noted that, in some cases, the terminal and the core network node may store inconsistent information about the cell that the terminal was last served by.

[0161] For example, after the UE releases the RRC connection, it will update its stored information of the last served cell, that is, update its stored information of the last served cell to the cell that accesses the network this time (that is, the cell that releases the RRC connection this time). If the base station discards the data packet sent by the UE to it, the core network will not know the cell that the UE accesses this time, so the cell that the UE was last served by the network side is still the cell when the UE last accessed the network, not the cell that it accesses this time. Once the UE updates its stored information of the last served cell, the information of the last served cell stored by the network side and the UE side will be inconsistent, which will cause the base station to use the wake-up signal in the cell where the UE last accessed, but the UE monitors the wake-up signal in the cell that it accesses this time, resulting in the UE not being able to monitor the wake-up signal in the cell that it accesses this time, so the UE cannot receive the paging of the base station in the cell that it accesses this time.

[0162] In this embodiment, the first indication information may be introduced into the first message, and the first indication information is used to indicate at least one of the following: radio resource control connection rejection; radio resource control connection failure; radio resource control connection release; radio resource control connection not established; the core network node not connected; the core network node is not aware of the terminal's current access; the access network node does not send the first data to the core network node. When the first indication information exists in the first message, the terminal does not update the cell information of the terminal's last service or saves the cell information of the terminal's last access to the access network node as the cell information of the terminal's last service. In this way, the last serviced cell stored by the UE is still the cell where the UE last accessed the network, and the last serviced cell stored by the network is also the cell where the UE last accessed the network. In this way, the base station uses a wake-up signal in the cell where the UE last accessed the network, and the UE monitors the paging after detecting the wake-up signal, so that the UE can receive the paging of the base station in the cell where it last accessed the network.

[0163] It can be seen that in this embodiment, the first information includes the cell information where the terminal was last served. After the terminal receives the first message from the access network node, the terminal learns that the core network node to which it is accessed this time is unknown. Therefore, the terminal does not update the stored last served cell information or save the cell information of the last access to the access network node as the last served cell information, so that the last served cell information stored by it is consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the cell corresponding to the stored last served cell information, and then receive paging according to the wake-up signal.

[0164] In an exemplary embodiment, after processing the first information according to the first message, the method further includes: if the terminal is located in a cell corresponding to the cell information last served by the terminal, the terminal monitors the wake-up signal and pages according to the wake-up signal; if the terminal is located in a first cell, the terminal monitors the wake-up signal, wherein the first cell does not include the cell corresponding to the cell information last served by the terminal.

[0165] Among them, for the access network node, after the access network node sends the first message to the terminal, the method also includes: the access network node receives a paging message from the core network node, wherein the paging message includes the cell information of the terminal being last served; the access network node uses a wake-up signal when paging the terminal in the cell corresponding to the cell information of the terminal being last served, and does not use a wake-up signal when paging the terminal in the first cell, wherein the wake-up signal is used to indicate that the terminal receives the paging, and the first cell does not include the cell corresponding to the cell information of the terminal being last served.

[0166] Specifically, when the terminal is in the last served cell stored in its storage, it first monitors the wake-up signal, and then monitors the paging of the access network node after detecting the wake-up signal; in other cells, the terminal directly monitors the paging. Compared with the last served cell stored in its storage, the terminal is always monitoring paging in other cells, so the monitoring paging overhead is relatively large; while in the last served cell stored in its storage, the terminal will monitor the PDCCH channel only after detecting the wake-up signal. If no WUS signal is detected, the PDCCH channel corresponding to this paging will not be monitored, so the monitoring paging overhead is relatively small.

[0167] It can be seen that in this embodiment, if the terminal is located in the last served cell stored in its storage, it monitors the wake-up signal and receives paging based on the wake-up signal; if the terminal is located in a cell other than the last served cell stored in its storage, it does not monitor the wake-up signal; since the wake-up signal is monitored in the last served cell stored in the terminal, the terminal monitors the paging only after detecting the wake-up signal, which is beneficial to reducing the terminal monitoring paging overhead.

[0168] In an exemplary implementation, the first message includes a radio resource control release message.

[0169] Among them, the first message in the embodiment of the present application can be a wireless resource control release message, so that the embodiment of the present application can be applied to scenarios where all terminals are released by wireless resource control but the core network node is not aware of it, such as the core network node is overloaded, and the core network node and the access network node have not established an S1 interface association or NG interface association with the terminal.

[0170] Specifically, the base station may send an RRC connection release message or an RRC release message (RRC ConnectionRelease / RRC Release) to the UE to initiate the RRC connection release process of the UE. After receiving the RRC connection release message / RRC release message, the UE may release the RRC connection and convert from the RRC connected state (RRC_CONNECTED state) to the RRC idle state (RRC_IDLE state) or the RRC inactive state (RRC_INACTIVE state).

[0171] It can be seen that in this embodiment, the access network node sends a wireless resource control release message to the terminal, which is used to instruct the terminal to release the wireless resource control connection, so that the terminal learns that its current access to the core network node is unknown, and after releasing the wireless resource control connection, the terminal processes the last served cell information stored by it, for example, does not update the last served cell information stored by it; so that the last served cell information stored by it is consistent with the last served cell information of the terminal stored by the core network node.

[0172] In an exemplary implementation, the first indication information includes a radio resource control release cause (RRC release cause).

[0173] The specific indication information may be a radio resource control release reason or a separate indication information. The separate indication information is relative to using the radio resource control release reason as the indication information.

[0174] For example, the content of the indication information may be release for CN overload, release without CN involvement, immediate release, connection reject, etc., to indicate that the MME or AMF is unaware of the UE's access this time, or that the base station has not established a UE-related S1 interface association or NG interface association with the MME or AMF.

[0175] It can be seen that in this embodiment, since the paging process is that the core network node sends the last served cell information of the terminal to be paged to the access network node, and then the access network node uses a wake-up signal when initiating paging in the cell where the terminal was last served, if the indication information in the wireless resource control release message indicates that when the wireless resource control is released, the access network node did not report the service cell information of the terminal's current access to the core network node, then in order to receive the paging of the access network node, the terminal will not update its own stored last served cell information, so that the terminal side stored The terminal side’s last served cell information is consistent with the terminal’s last served cell information stored on the core network node side.

[0176] In an exemplary embodiment, the method further includes: the terminal sending a second message to the access network node, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports control plane cellular Internet of Things (CP CIoT) or whether the terminal supports user plane cellular Internet of Things (UPCIoT).

[0177] Among them, the second message can be a wireless resource control connection establishment completion message, but is not limited to this, it can also be other messages, and its function is to inform the access network node whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0178] For example, the terminal can carry the second indication information in the wireless resource control connection establishment completion message, and inform the access network node through the second indication information whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0179] It can be seen that in this embodiment, the terminal can send a second message to the access network node. Since the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things, the access network node can obtain information through the second message about whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; because when the core network node is overloaded, it does not accept access from terminals that only support the control plane cellular Internet of Things or do not support the user plane cellular Internet of Things, so that the access network node can determine whether to accept the access of the terminal through the second indication information in the second message.

[0180] In an exemplary embodiment, the receiving of the first message from the access network node includes: if the core network node is overloaded and the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the terminal receives the wireless resource control release message from the access network node.

[0181] Specifically, when the core network node is overloaded and the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the wireless resource control release will be triggered, and the access network node will send a wireless resource control release message to the terminal. After receiving the wireless resource control release message from the access network node, the terminal releases the wireless resource control connection.

[0182] It can be seen that in this embodiment, when the core network node is overloaded, it does not accept access from terminals that only support control plane cellular Internet of Things or do not support user plane cellular Internet of Things. If the access network node knows that the terminal only supports control plane cellular Internet of Things or does not support user plane cellular Internet of Things, the access network node will send a wireless resource control release message to the terminal, thereby refusing to accept access from the terminal.

[0183] In an exemplary embodiment, the method also includes: the access network node receives an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted; the access network node receives a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0184] Specifically, when the core network node is overloaded, it will send an overload start message to the access network node, and the overload start message is used to indicate that the terminal that only supports the control plane cellular Internet of Things is not accepted for access; in addition, the access network node will also receive a second message from the terminal, and the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; thereby, the access network node can determine whether to send a wireless resource control release message to the terminal to refuse to accept the access of the terminal.

[0185] It can be seen that in this embodiment, when the core network node is overloaded, it can send an overload start message to the access network node, indicating that the terminal that only supports the control plane cellular Internet of Things is not accepted for access; in addition, the access network node can receive a second message from the terminal. Since the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; the access network node can determine whether to accept the access of the terminal when the core network node is overloaded through the second indication information in the second message.

[0186] The following is a detailed description of this embodiment with reference to specific examples. Figure 7, Figure 7 : is a flow chart of another communication method provided in an embodiment of the present application, the method includes but is not limited to the following steps:

[0187] Step 701: The base station sends an RRC release message to the UE, where the RRC release message is used to instruct the UE to release the RRC connection. The RRC release message includes first indication information, where the first indication information is used to inform the UE that the MME / AMF is not aware of this access to the base station.

[0188] Step 702: The UE receives the RRC release message from the base station.

[0189] Specifically, the base station adds indication information in the RRC release message to tell the UE that the MME or AMF is unaware of the base station it is accessing this time. Since the UE knows that the MME or AMF is unaware of the base station it is accessing this time, the UE knows that the data transmitted to the base station through NAS has not been sent to the network, that is, it has not been sent to the MME or AMF; the UE will not update the last served cell information, or the UE saves the served cell information of the last access as the last served cell information of the UE.

[0190] From this, it can be seen that through the first indication information, the UE can know whether the data packet sent to the base station through NAS in msg5 has been sent to the core network, and can keep the last served cell information of the UE stored on the UE side and the core network side consistent, avoiding paging failure.

[0191] It can be seen that in this example, the base station adds indication information to the RRC release message to inform the UE that the MME or AMF is not aware of its access to the base station this time. Therefore, the UE knows that the data transmitted to the base station through NAS is not sent to the MME or AMF. Therefore, the UE does not update the last served cell information. The last served cell information of the UE stored on the UE side and the core network side is consistent, which is conducive to the base station paging the UE.

[0192] See also Figure 8 , Figure 8 : is a flow chart of another communication method provided in an embodiment of the present application, the method includes but is not limited to the following steps:

[0193] Step 801: The access network node sends a wireless resource control release message to the terminal and sends a first S1 interface application protocol (S1AP) message or a first NG interface application protocol (NGAP) message to the core network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time.

[0194] Step 802: The core network node receives a first S1 interface application protocol message or a first NG interface application protocol message from an access network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time, and the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal.

[0195] Step 803: The core network node stores the cell information of the access network node to which the terminal currently accesses.

[0196] Among them, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association about the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association about the terminal between the core network and the access network. Therefore, in this embodiment, even if the S1 interface association or NG interface association about the terminal is not established or activated between the core network and the access network, the access network node can send the cell information of the terminal accessing the access network node to the core network node. In addition, after receiving the radio resource control release message from the access network node, the terminal releases the radio resource control connection and updates the last served cell information, that is, the terminal updates the cell information of the current access to the access network node to the last served cell information. Therefore, the last served cell information stored by the terminal is consistent with the last served cell information stored by the core network node.

[0197] For example, after releasing the RRC connection, the UE will update its stored information of the last served cell, that is, update its stored information of the last served cell to the cell where the UE accesses the network this time (that is, the cell where the RRC connection is released this time) information; and the base station knows the cell where the UE accesses the network this time, and the base station can send the cell information of the UE's access to the network this time to the MME or AMF through S1AP information or NGAP message; thus, the last served cell information of the UE stored by the MME or AMF is consistent with the last served cell information stored by the UE, and in the subsequent paging message triggered by the core network, the MME or AMF will send the stored information of the last served cell of the UE to the base station, and the base station will use WUS for the UE only in the cell where the UE releases the RRC connection this time, thereby successfully paging the UE.

[0198] It can be seen that in this embodiment, the access network node sends a wireless resource control release message to the terminal. After receiving the wireless resource control release message, the terminal will release the wireless resource control connection and update the last served cell information stored in it, that is, save the cell information of the current access to the access network node as the last served cell information; in addition, the access network node will also send the cell information of the terminal's current access to the access network node to the core network node through the first S1 interface application protocol message or the first NG interface application protocol message, so that the last served cell information stored by the terminal can be consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored in it, and then receive paging according to the wake-up signal.

[0199] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal.

[0200] It can be seen that in this embodiment, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with the terminal between the core network and the access network. Therefore, in this embodiment, even if the S1 interface association or NG interface association with the terminal is not established or activated between the core network and the access network, the access network node can send the cell information of the terminal accessing the access network node to the core network node.

[0201] In an exemplary embodiment, the method also includes: the access network node receives an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted; the access network node receives a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0202] Specifically, when the core network node is overloaded, it will send an overload start message to the access network node, and the overload start message is used to indicate that the terminal that only supports the control plane cellular Internet of Things is not accepted for access; in addition, the access network node will also receive a second message from the terminal, and the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; thereby, the access network node can determine whether to send a wireless resource control release message to the terminal to refuse to accept the access of the terminal.

[0203] The second message may include a radio resource control connection establishment completion message.

[0204] It can be seen that in this embodiment, when the core network node is overloaded, it can send an overload start message to the access network node, indicating that the terminal that only supports the control plane cellular Internet of Things is not accepted for access; in addition, the access network node can receive a second message from the terminal. Since the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; the access network node can determine whether to accept the access of the terminal when the core network node is overloaded through the second indication information in the second message.

[0205] In an exemplary embodiment, the sending of a wireless resource control release message to the terminal and the sending of a first S1 interface application protocol message or a first NG interface application protocol message to the core network node include: if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node sends a wireless resource control release message to the terminal and sends a first S1 interface application protocol message or a first NG interface application protocol message to the core network node.

[0206] Specifically, due to core network overload, if the terminal only supports control plane cellular Internet of Things or the terminal does not support user plane cellular Internet of Things, it means that the core network node does not accept the access of the terminal, so the access network node sends a wireless resource control release message to the terminal; in order to make the last served cell information stored by the terminal and the last served cell information of the terminal stored by the core network node consistent, the access network node will also send the cell information of the terminal accessing this time to the core network node through the first S1 interface application protocol message or the first NG interface application protocol message for storage.

[0207] It can be seen that in this embodiment, when the core network node is overloaded and the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node sends a wireless resource control release message to the terminal to refuse to accept the access of the terminal, so that the terminal releases the wireless resource control connection and saves the cell information of this access to the access network node as the last served cell information; and the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node to send the cell information of the terminal's current access to the access network node to the core network node for storage, so that the last served cell information stored by the terminal is consistent with the last served cell information of the terminal stored by the core network node.

[0208] In an exemplary embodiment, the wireless resource control release message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send first data to the core network node, wherein the first data includes data sent by the terminal to the access network node.

[0209] It can be seen that in this embodiment, the wireless resource control release message includes the first indication information. Since the first indication information is used to indicate at least one of the following: wireless resource control connection rejection, wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; core network node not connected; core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node; therefore, after receiving the wireless resource control release message, the terminal can know that the data sent to the access network node before receiving the wireless resource control release message has not been sent to the core network node.

[0210] In an exemplary implementation, the first indication information is used by the terminal to process first data, where the first data includes data received from the terminal before a radio resource control release message is sent to the terminal.

[0211] For example, the first data is a message sent by the terminal to the access network node through a wireless resource control connection establishment completion message. Since the access network node does not send the first data to the core network node, the access network node can instruct the terminal to retransmit the first data through a first indication information.

[0212] It can be seen that in this embodiment, when the first data sent by the terminal to the access network node is not sent to the core network node, the terminal can retransmit the first data at the next access based on the first indication information in the first message, which is helpful to ensure that the first data can be sent to the core network node.

[0213] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message further includes an identifier of the terminal.

[0214] For example, the terminal identifier may be a temporary mobile subscriber identity (S-TMSI) of the UE, or an S1 interface application protocol identifier (S1AP ID) of the UE, or an NG interface application protocol identifier (NGAP ID) of the UE, and the like.

[0215] Among them, the cell information where the terminal was last served is associated with the terminal's identifier and stored. When the terminal needs to be paged, the core network node can accurately send the cell information where the terminal was last served to the access network node through the stored terminal identifier, which is conducive to ensuring that the terminal is paged.

[0216] It can be seen that in this embodiment, when the access network node sends the updated information of the cell where the terminal was last served to the core network node, the access network node also sends the identifier of the terminal to the core network node. The core network node can store the information of the cell where the terminal was last served and the identifier of the terminal in association; when it is necessary to page the terminal, the core network node can accurately send the information of the cell where the terminal was last served to the access network node through the stored identifier of the terminal, thereby facilitating the access network node to use a wake-up signal when initiating paging in the cell where the terminal was last served, and the terminal successfully receives the paging from the access network node.

[0217] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message includes a Retrieve UE Information message.

[0218] Among them, Retrieve UE Information is an existing message on S1AP or NGAP. The access network node can reuse this message and add instructions on it to send updated cell information, terminal identification, etc. of the last served terminal to the core network node. In addition, the access network node may not reuse the Retrieve UE Information message, and newly define another message to send updated cell information, terminal identification, etc. of the last served terminal to the core network node through the newly defined message, and this application does not make specific restrictions on this.

[0219] It can be seen that in this implementation, the access network node uses an existing message (ie, Retrieve UE Information) on the S1 interface application protocol or the NG interface application protocol to send the cell information last served by the terminal to the core network node.

[0220] The following is a detailed description of this embodiment with reference to specific examples. Fig. 9 , Fig. 9 : is a flow chart of another communication method provided in an embodiment of the present application, the method includes but is not limited to the following steps:

[0221] Step 901: The base station sends an RRC release message to the UE, where the RRC release message is used to instruct the UE to release the RRC connection.

[0222] Step 902: The base station sends a first S1 interface application protocol message or a first NG interface application protocol message to the MME / AMF, where the first S1 interface application protocol message or the first NG interface application protocol message includes information about the cell last served by the UE.

[0223] Specifically, the base station sends an RRC release message to the UE, and then the UE releases the RRC connection and updates the information of the cell accessed this time (that is, the cell where the RRC connection is released this time) to the cell information where the UE was last served. In addition, when the base station releases the RRC connection with the UE, the information of the cell accessed this time by the UE (that is, the cell where the RRC connection is released this time) is sent to the MME / AMF through the first S1 interface application protocol message or the first NG interface application protocol message, and then the MME / AMF updates the information of the cell accessed this time by the UE (that is, the cell where the RRC connection is released this time) to the cell information where the UE was last served. Thus, the information of the cell where the UE was last served stored on the UE side and the core network side can be kept consistent, avoiding paging failures.

[0224] Among them, the base station can also add indication information in the RRC release message, and the indication information is used to inform the UE that the MME / AMF is not aware of the access to the base station this time, but the UE still updates the last served cell information normally, that is, stores the currently accessed cell as the last served cell.

[0225] It should be noted that, in this example, the order in which the base station executes step 901 and step 902 is not limited. Step 901 may be executed first and then step 902, or step 902 may be executed first and then step 901. Step 901 and step 902 may also be triggered together.

[0226] It can be seen that in this example, the base station sends an RRC release message to the UE, the UE releases the RRC connection, and the UE updates the cell information of this access to the cell information of its last service; the base station sends the cell information of the UE this time to the MME or AMF, and the MME / AMF updates the cell information of the UE this time to the cell information of the UE last service; thus, the cell information of the UE last serviced stored on the UE side and the core network side is consistent, which is conducive to the base station paging the UE.

[0227] See also Fig.10 , Fig.10 : is a flow chart of another communication method provided in an embodiment of the present application, the method includes but is not limited to the following steps:

[0228] 1001. An access network node receives a radio resource control connection request message from a terminal.

[0229] 1002. The access network node sends a second S1 interface application protocol message or a second NG interface application protocol message to the core network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal.

[0230] 1003. The core network node receives a second S1 interface application protocol message or a second NG interface application protocol message from an access network node.

[0231] 1004. The core network node sends a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0232] 1005. The access network node receives a third S1 interface application protocol message or a third NG interface application protocol message from the core network node.

[0233] 1006. If the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node sends a radio resource control connection rejection message to the terminal.

[0234] It is understandable that before the terminal and the access network node establish a wireless resource control connection, the access network node does not know whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things. Therefore, the access network node can send the identifier of the terminal to the core network node through the second S1 interface application protocol message or the second NG interface application protocol message; the core network node then sends the result of whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things to the access network node through the third S1 interface application protocol message or the third NG interface application protocol message, so that the access network node obtains from the core network side whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0235] The terminal identifier may be a temporary mobile subscriber identity (S-TMSI) of the UE, or an S1 interface application protocol identifier (S1AP ID) of the UE, or an NG interface application protocol identifier (NGAP ID) of the UE, etc.

[0236] For example, after the UE sends a radio resource control connection request to the base station, the base station may reject the radio resource control connection request of the UE because the MME or AMF has not established or activated the S1 interface association or NG interface association with the base station; or because the NAS packet sent by the UE to the base station will be discarded by the base station, and the base station does not send the NAS packet to the MME or AMF; or because the MME or AMF is overloaded; or there are other reasons that may make the MME or AMF unable to obtain the cell information served by the UE's current connection request. Therefore, the UE does not access the network this time, and the last cell information served is not updated. Therefore, the last cell information served by the UE recorded on the network side and the UE side is still the cell information of the last time the UE accessed the network. In this way, the base station can use a wake-up signal in the cell where the UE last accessed the network, and then page the UE.

[0237] It can be seen that in this embodiment, after receiving the wireless resource control connection request message of the terminal, the access network node will send a second S1 interface application protocol message or a second NG interface application protocol message to the core network node, and inform the core network node of the terminal identifier; the core network node can determine whether the terminal is a terminal that only supports the control plane cellular Internet of Things or whether it is a terminal that supports the user plane cellular Internet of Things through the identifier of the terminal; then the core network node sends a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, and informs the core network node of whether the terminal is a terminal that only supports the control plane cellular Internet of Things or whether it is a terminal that supports the user plane The result of the terminal of the cellular Internet of Things is notified to the access network node; if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node directly rejects the wireless resource control connection request of the terminal; since the wireless resource control connection request initiated by the terminal is rejected, the terminal does not successfully access the network, then the terminal will not update its stored last served cell information, so that the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0238] In an exemplary embodiment, the method further includes: the access network node receiving an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports control plane cellular Internet of Things is not accepted.

[0239] For example, after the base station receives a radio resource control connection request from the UE, if the MME or AMF is overloaded and the UE is a UE that only supports control plane cellular IoT, the base station will send a radio resource control connection reject message to the UE to reject the UE's access.

[0240] It can be seen that in this embodiment, when the core network node is overloaded, it can send an overload start message to the access network node, indicating that it does not accept access from terminals that only support the control plane cellular Internet of Things. Therefore, when the access network node determines that the terminal only supports the control plane cellular Internet of Things, it sends a wireless resource control connection rejection message to the terminal to reject the access of the terminal.

[0241] In an exemplary implementation, the second S1 interface application protocol message or the second NG interface application protocol message, and the third S1 interface application protocol message or the third NG interface application protocol message, do not establish or activate the S1 interface association or NG interface association of the terminal.

[0242] It can be seen that in this implementation manner, the second S1 interface application protocol message or the second NG interface application protocol message, and the third S1 interface application protocol message or the third NG interface application protocol message, do not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the second S1 interface application protocol message or the second NG interface application protocol message and the third S1 interface application protocol message or the third NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with respect to the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with respect to the terminal between the core network and the access network. Therefore, in this implementation manner, even if the S1 interface association or NG interface association with respect to the terminal is not established or activated between the core network and the access network, the access network node can still send the terminal identifier to the core network node, and the core network node can also send the third indication information used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things to the access network node.

[0243] The following is a detailed description of this embodiment with reference to specific examples. Fig.11 , Fig.11 : is a flow chart of another communication method provided in an embodiment of the present application, the method includes but is not limited to the following steps:

[0244] Step 1101: MME / AMF sends overload start information to a base station, where the overload start information is used to inform the base station that the MME / AMF is overloaded, indicating that the base station does not accept access by a cellular Internet of Things UE that only supports the control plane.

[0245] Step 1102: The UE sends an RRC connection request to the base station.

[0246] Step 1103: The base station sends a second S1 interface application protocol message or a second NG interface application protocol message to the MME / AMF, where the second S1 interface application protocol message or the second NG interface application protocol message includes the identifier of the UE.

[0247] Step 1104: The MME / AMF sends a third S1 interface application protocol message or a third NG interface application protocol message to the base station, where the third S1 interface application protocol message or the third NG interface application protocol message is used to indicate whether the UE only supports the control plane cellular Internet of Things.

[0248] Step 1105: If the UE only supports the control plane cellular Internet of Things, the base station sends an RRC connection rejection message to the UE.

[0249] Among them, the base station obtains from the core network side whether the UE is a UE that only supports the control plane cellular Internet of Things. If so, in the core network overload scenario, the UE's access is directly denied.

[0250] Specifically, the MME or AMF tells the base station to overload start (Overload Start) and requires that access from UEs that only support control plane cellular IoT (CP only UE) not be accepted; after the base station receives the RRC connection request (RRCConnectionRequest) sent by the UE, the base station sends a message to the MME or AMF, carrying the UE's S-TMSI; thereafter, the MME or AMF sends a message to the base station, carrying an indication of whether the UE supports the UP CIoT solution or whether the UE is a CP only UE; when the UE supports the UP CIoT solution or the UE is a CP only UE, the base station sends an RRC reject message to the UE to reject the UE's access.

[0251] It can be seen that in this example, since the UE receives an RRC rejection message, the UE will not update the last served cell information, so that the last served cell information of the UE stored on the UE side and the core network side is consistent, which is conducive to the base station paging the UE.

[0252] See also Fig.12 , Fig.12 : is a flow chart of another communication method provided in an embodiment of the present application, the method includes but is not limited to the following steps:

[0253] Step 1201: The terminal sends first data to the access network node.

[0254] Step 1202: The access network node does not send an application protocol message to the core network control plane node, and the access network node sends the first data to the core network user plane node.

[0255] Step 1203: The terminal does not update the stored information of the last served cell.

[0256] Optionally, before step 1203, the access network node sends first indication information to the terminal, and the terminal executes step 1203 according to the first indication information.

[0257] The first data may be a non-access stratum protocol data unit NAS PDU (Non Access Stratum Protocol Data Unit) or user plane data.

[0258] Among them, the core network control plane node can be an access and mobility management function AMF (Access and Mobility Management Function) or a mobility management entity MME (Mobility Management Entity), and the core network user plane node can be a user plane function UPF (User Plane Function) or a serving gateway SGW (Serving Gateway).

[0259] It can be seen that in this embodiment, the terminal quickly accesses the access network node and then sends the first data to the access network node, so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node, thereby realizing the transmission of data to the core network; since the access network node does not send an application protocol message to the core network control plane node, that is, the access network node does not send the cell information of the terminal's quick access this time to the core network control plane node, the core network stores the last served cell information of the terminal or the cell information of the last access, so the terminal does not update the stored last served cell information, that is, the terminal does not store the cell information of this quick access as the last served cell information; thus, the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0260] In an exemplary implementation, before or while sending the first data to the access network node, the method further includes: triggering fast access to the access network node.

[0261] It can be seen that in this embodiment, before or while sending the first data to the access network node, the terminal triggers fast access to the access network node, that is, the terminal quickly accesses the access network node, thereby facilitating the transmission of the first data to the core network through fast access.

[0262] In an exemplary implementation, the fast access includes small packet transmission, early data transmission, two-step random access, and resource reservation access.

[0263] It can be seen that in this implementation, fast access includes small packet transmission, early data transmission, two-step random access, and resource reservation access, so that the terminal can transmit the first data to the core network in a variety of ways.

[0264] The above mainly introduces the scheme of the embodiment of the present application from the perspective of the interaction between various network elements on the method side. It can be understood that in order to realize the above functions, the access network node and the terminal include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in this specification, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0265] See also Fig.13 , Fig.13 13 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device 1300 may include a receiving unit 1301 and a processing unit 1302. The communication device 1300 is applied to a terminal, wherein each unit is described in detail as follows:

[0266] The receiving unit 1301 is configured to receive a first message from an access network node;

[0267] Processing unit 1302 is used to process first information according to the first message, wherein the first information includes information that needs to be stored by the terminal and the core network node; and / or process first data according to the first message, wherein the first data includes data sent to the access network node before receiving the first message from the access network node.

[0268] In an exemplary embodiment, the first message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node.

[0269] In an exemplary embodiment, the processing the first data includes retransmitting the first data.

[0270] In an exemplary implementation, the first information includes information about the cell that the terminal was last served by.

[0271] In an exemplary implementation, the processing of the first information includes: not updating the cell information last served by the terminal; or saving the cell information of the last access of the terminal to the access network node as the cell information last served by the terminal.

[0272] In an exemplary embodiment, the receiving unit 1301 is also used to: if it is located in a cell corresponding to the cell information last served by the terminal, monitor the wake-up signal and receive paging according to the wake-up signal; if it is located in a first cell, do not monitor the wake-up signal, wherein the first cell does not include the cell corresponding to the cell information last served by the terminal.

[0273] In an exemplary implementation, the first message includes a radio resource control release message.

[0274] In an exemplary implementation, the first indication information includes a radio resource control release reason.

[0275] In an exemplary embodiment, the device also includes: a sending unit 1303, used to send a second message to the access network node, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0276] In an exemplary embodiment, the receiving unit 1301 is specifically used to: if the core network node is overloaded and the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, then receive the wireless resource control release message from the access network node.

[0277] It should be noted that the implementation of each unit can also refer to Figure 6 or Figure 7 Of course, the communication device 1300 provided in the embodiment of the present application includes but is not limited to the above-mentioned unit modules, for example: the communication device 1300 may also include a storage unit 1304. The storage unit 1304 may be used to store the program code and data of the communication device 1300.

[0278] exist Fig.13In the described communication device 1300, a first message is received from an access network node, and then the first information is processed according to the first message. Since the first information includes information that needs to be stored by the terminal and the core network node, when the first information is information about the cell where the terminal was last served, the last served cell information stored by the terminal is processed so that the last served cell information stored by the terminal is consistent with the last served cell information stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored by it, and then receive paging according to the wake-up signal; or the first data is processed according to the first message. Since the first data includes data sent by the terminal to the access network node before receiving the first message from the access network node, if the first data is not sent successfully, the first data can be retransmitted to the access network node according to the first message, thereby ensuring that the first data can be successfully sent.

[0279] See also Fig.14 , Fig.14 14 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device 1400 may include a sending unit 1401. The communication device 1400 is applied to an access network node, wherein each unit is described in detail as follows:

[0280] The sending unit 1401 is used to send a first message to the terminal, wherein the first message is used by the terminal to process first information, and the first information includes information that needs to be stored by the terminal and the core network node; and / or the first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal.

[0281] In an exemplary embodiment, the first message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send the first data to the core network node.

[0282] In an exemplary embodiment, the processing the first data includes retransmitting the first data.

[0283] In an exemplary implementation, the first information includes information about the cell that the terminal was last served by.

[0284] In an exemplary implementation, the processing of the first information includes: not updating the cell information last served by the terminal; or saving the cell information of the last access of the terminal to the access network node as the cell information last served by the terminal.

[0285] In an exemplary embodiment, the device also includes: a receiving unit 1402, used to receive a paging message from a core network node after sending a first message to the terminal, wherein the paging message includes information about the cell last served by the terminal; the sending unit 1401 is also used to use a wake-up signal when paging the terminal in a cell corresponding to the cell information last served by the terminal, and not use a wake-up signal when paging the terminal in a first cell, wherein the wake-up signal is used to indicate that the terminal receives paging, and the first cell does not include the cell corresponding to the cell information last served by the terminal.

[0286] In an exemplary implementation, the first message includes a radio resource control release message.

[0287] In an exemplary implementation, the first indication information includes a radio resource control release reason.

[0288] In an exemplary embodiment, the receiving unit 1402 is also used to receive an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted; and receive a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0289] In an exemplary implementation, the sending unit 1401 is specifically used to: if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, send the wireless resource control release message to the terminal.

[0290] It should be noted that the implementation of each unit can also refer to Figure 6 or Figure 7 Of course, the communication device 1400 provided in the embodiment of the present application includes but is not limited to the above-mentioned unit modules, for example: the communication device 1400 may also include a storage unit 1403. The storage unit 1403 may be used to store the program code and data of the communication device 1400.

[0291] exist Fig.14In the described communication device 1400, a first message is sent to a terminal, wherein the first message is used by the terminal to process first information, and the first information includes information that needs to be stored by the terminal and the core network node. Since the first information includes information that needs to be stored by the terminal and the core network node, when the first information is the cell information of the terminal that was last served, the terminal processes the last cell information stored by it, so that the last cell information stored by the terminal is consistent with the last cell information stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last cell served by it, and then receive the paging according to the wake-up signal; and / or the first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal. Since the first data includes data sent by the terminal to the access network node before receiving the first message from the access network node, if the first data is not sent successfully, the first data can be retransmitted to the access network node according to the first message, thereby ensuring that the first data can be successfully sent.

[0292] See also Fig.15 , Fig.15 15 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device 1500 may include a sending unit 1501. The communication device 1500 is applied to an access network node, wherein each unit is described in detail as follows:

[0293] The sending unit 1501 is used to send a wireless resource control release message to the terminal and send a first S1 interface application protocol message or a first NG interface application protocol message to the core network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time.

[0294] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal.

[0295] In an exemplary embodiment, the device also includes: a receiving unit 1502, used to receive an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted; and receiving a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0296] In an exemplary embodiment, the sending unit 1501 is specifically used to: if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, send a wireless resource control release message to the terminal and send a first S1 interface application protocol message or a first NG interface application protocol message to the core network node.

[0297] In an exemplary embodiment, the wireless resource control release message includes first indication information, and the first indication information is used to indicate at least one of the following: wireless resource control connection rejection; wireless resource control connection failure; wireless resource control connection release; wireless resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's access this time; access failure; access rejection; the access network node does not send first data to the core network node, wherein the first data includes data sent by the terminal to the access network node.

[0298] In an exemplary implementation, the first indication information is used by the terminal to process first data, where the first data includes data received from the terminal before a radio resource control release message is sent to the terminal.

[0299] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message further includes an identifier of the terminal.

[0300] In an exemplary implementation, the first S1 interface application protocol message or the first NG interface application protocol message includes a Retrieve UE Information message.

[0301] It should be noted that the implementation of each unit can also refer to Figure 8 or Fig. 9 Of course, the communication device 1500 provided in the embodiment of the present application includes but is not limited to the above-mentioned unit modules, for example: the communication device 1500 may also include a storage unit 1503. The storage unit 1503 may be used to store the program code and data of the communication device 1500.

[0302] exist Fig.15In the described communication device 1500, a wireless resource control release message is sent to the terminal. After receiving the wireless resource control release message, the terminal will release the wireless resource control connection and update the last served cell information stored in it, that is, the cell information of the current access to the access network node is saved as the last served cell information; in addition, the cell information of the current access to the access network node by the terminal is sent to the core network node through the first S1 interface application protocol message or the first NG interface application protocol message. In this way, the last served cell information stored by the terminal can be consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored in it, and then receive paging according to the wake-up signal.

[0303] See also Fig.16 , Fig.16 It is a structural diagram of another communication device provided in an embodiment of the present application. The communication device 1600 may include a receiving unit 1601 and a storage unit 1602. The communication device 1600 is applied to a core network node, wherein each unit is described in detail as follows:

[0304] The receiving unit 1601 is configured to receive a first S1 interface application protocol message or a first NG interface application protocol message from an access network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes cell information of the terminal accessing the access network node this time, and the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal;

[0305] The storage unit 1602 is used to store the cell information of the access network node that the terminal accesses this time.

[0306] It should be noted that the implementation of each unit can also refer to Figure 8 or Fig. 9 The storage unit 1602 can also be used to store program codes and data of the communication device 1600.

[0307] exist Fig.16In the described communication device 1600, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with the terminal between the core network and the access network. Therefore, in this implementation manner, even if the S1 interface association or NG interface association with the terminal is not established or activated between the core network and the access network, the access network node can send the cell information of the terminal accessing the access network node to the core network node.

[0308] See also Fig.17 , Fig.17 1700 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device 1700 may include a receiving unit 1701 and a sending unit 1702. The communication device 1700 is applied to an access network node, wherein each unit is described in detail as follows:

[0309] The receiving unit 1701 is configured to receive a radio resource control connection request message from a terminal;

[0310] The sending unit 1702 is configured to send a second S1 interface application protocol message or a second NG interface application protocol message to a core network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal;

[0311] The receiving unit 1701 is further used to receive a third S1 interface application protocol message or a third NG interface application protocol message from the core network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal supports only the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things;

[0312] The sending unit 1702 is also used to send a wireless resource control connection rejection message to the terminal if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things.

[0313] In an exemplary embodiment, the receiving unit 1701 is further used to receive an overload start message from the core network node, wherein the overload start message is used to indicate that terminal access that only supports the control plane cellular Internet of Things is not accepted.

[0314] It should be noted that the implementation of each unit can also refer to Fig.10 or Fig.11 Of course, the communication device 1700 provided in the embodiment of the present application includes but is not limited to the above-mentioned unit modules, for example: the communication device 1700 may also include a storage unit 1703. The storage unit 1703 may be used to store the program code and data of the communication device 1700.

[0315] exist Fig.17 In the communication device 1700 described, after receiving the wireless resource control connection request message of the terminal, a second S1 interface application protocol message or a second NG interface application protocol message is sent to the core network node to inform the core network node of the terminal identifier; the core network node can determine whether the terminal is a terminal that only supports the control plane cellular Internet of Things or whether it is a terminal that supports the user plane cellular Internet of Things through the identifier of the terminal; then the core network node sends a third S1 interface application protocol message or a third NG interface application protocol message to the access network node to inform whether the terminal is a terminal that only supports the control plane cellular Internet of Things or whether it is a terminal that supports the user plane cellular Internet of Things. The result of the terminal of the Internet of Things is notified to the access network node; if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node directly rejects the wireless resource control connection request of the terminal; since the wireless resource control connection request initiated by the terminal is rejected, the terminal does not successfully access the network, then the terminal will not update its stored last served cell information, so that the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0316] See also Fig.18 , Fig.18 1800 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device 1800 may include a receiving unit 1801 and a sending unit 1802. The communication device 1800 is applied to a core network node, wherein each unit is described in detail as follows:

[0317] The receiving unit 1801 is configured to receive a second S1 interface application protocol message or a second NG interface application protocol message from an access network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of a terminal;

[0318] The sending unit 1802 is used to send a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0319] In an exemplary implementation, the second S1 interface application protocol message or the second NG interface application protocol message, and the third S1 interface application protocol message or the third NG interface application protocol message, do not establish or activate the S1 interface association or NG interface association of the terminal.

[0320] It should be noted that the implementation of each unit can also refer to Fig.10 or Fig.11 Of course, the communication device 1800 provided in the embodiment of the present application includes but is not limited to the above-mentioned unit modules, for example: the communication device 1800 may also include a storage unit 1803. The storage unit 1803 may be used to store the program code and data of the communication device 1800.

[0321] exist Fig.18 In the described communication device 1800, the access network node sends the terminal identifier to the core network node through a second S1 interface application protocol message or a second NG interface application protocol message, and the core network node can inform the access network node through a third S1 interface application protocol message or a third NG interface application protocol message whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0322] See also Fig.19 , Fig.19 1900 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device 1900 may include a sending unit 1901 and a processing unit 1902. The communication device 1900 is applied to a terminal, wherein each unit is described in detail as follows:

[0323] A sending unit 1901 is configured to send first data to the access network node, so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node;

[0324] The processing unit 1902 is configured to not update the stored information of the last served cell.

[0325] In an exemplary implementation, before sending the first data to the access network node, the sending unit 1901 is further configured to trigger fast access to the access network node.

[0326] In an exemplary implementation, the fast access includes small packet transmission, early data transmission, two-step random access, and resource reservation access.

[0327] It should be noted that the implementation of each unit can also refer to Fig.12 Of course, the communication device 1900 provided in the embodiment of the present application includes but is not limited to the above-mentioned unit modules, for example: the communication device 1900 may also include a storage unit 1903. The storage unit 1903 may be used to store the program code and data of the communication device 1900.

[0328] exist Fig.19 In the described communication device 1900, first data is sent to the access network node so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node, thereby realizing data transmission to the core network; since the access network node does not send an application protocol message to the core network control plane node, that is, the access network node does not send the cell information of the terminal's current quick access to the core network control plane node, the core network stores the last served cell information of the terminal or the cell information of the last access, so the terminal does not update the stored last served cell information, that is, the terminal does not store the cell information of this quick access as the last served cell information; thus, the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0329] See also Fig. 20 , Fig. 20 It is a structural diagram of a terminal provided in an embodiment of the present application. The terminal 2010 includes a transceiver 2011, a processor 2012 and a memory 2013. The transceiver 2011, the processor 2012 and the memory 2013 are interconnected via a bus 2014.

[0330] The memory 2013 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable read only memory (EPROM), or portable read only memory (CD-ROM), and the memory 2013 is used for related instructions and data.

[0331] The transceiver 2011 is used to receive and send data.

[0332] The processor 2012 may be one or more central processing units (CPUs). When the processor 2012 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0333] The processor 2012 in the terminal 2010 is used to read the program code stored in the memory 2013 and perform the following operations: receiving a first message from an access network node; processing first information according to the first message, wherein the first information includes information that needs to be stored by the terminal and the core network node; and / or processing first data according to the first message, wherein the first data includes data sent to the access network node before receiving the first message from the access network node.

[0334] It should be noted that the implementation of each operation can also refer to Figure 6 or Figure 7 The corresponding description of the method embodiments is described.

[0335] exist Fig. 20 In the described terminal 2010, a first message from an access network node is received, and then the first information is processed according to the first message. Since the first information includes information that needs to be stored by the terminal and the core network node, when the first information is the information of the cell where the terminal was last served, the information of the cell where the terminal was last served is processed so that the information of the cell where the terminal was last served is consistent with the information of the cell where the terminal was last served stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the cell where the terminal was last served, and then receive the paging according to the wake-up signal; or the first data is processed according to the first message. Since the first data includes data sent by the terminal to the access network node before receiving the first message from the access network node, if the first data is not sent successfully, the first data can be retransmitted to the access network node according to the first message, thereby ensuring that the first data can be sent successfully.

[0336] Alternatively, the processor 2012 in the terminal 2010 is used to read the program code stored in the memory 2013 and perform the following operations: sending first data to the access network node so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node; and does not update the stored last served cell information.

[0337] It should be noted that the implementation of each operation can also refer to Fig.12 The corresponding description of the method embodiments is described.

[0338] exist Fig. 20 In the described terminal 2010, the terminal quickly accesses the access network node and then sends the first data to the access network node, so that the access network node does not send an application protocol message to the core network control plane node and sends the first data to the core network user plane node, thereby realizing the transmission of data to the core network; since the access network node does not send an application protocol message to the core network control plane node, that is, the access network node does not send the cell information of the terminal's quick access this time to the core network control plane node, the core network stores the last served cell information of the terminal or the cell information of the last access, so the terminal does not update the stored last served cell information, that is, the terminal does not store the cell information of this quick access as the last served cell information; thus, the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0339] See also Fig.21 , Fig.21 It is a structural diagram of an access network node provided in an embodiment of the present application. The access network node 2110 includes a transceiver 2111, a processor 2112 and a memory 2113. The transceiver 2111, the processor 2112 and the memory 2113 are interconnected via a bus 2114.

[0340] The memory 2113 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or portable read-only memory (CD-ROM), and the memory 2113 is used for related instructions and data.

[0341] The transceiver 2111 is used to receive and send data.

[0342] The processor 2112 may be one or more central processing units (CPUs). When the processor 2112 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0343] The processor 2112 in the access network node 2110 is used to read the program code stored in the memory 2113 and perform the following operations: sending a first message to the terminal, wherein the first message is used by the terminal to process first information, and the first information includes information that needs to be stored by the terminal and the core network node; and / or the first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal.

[0344] It should be noted that the implementation of each operation can also refer to Figure 6 or Figure 7 The corresponding description of the method embodiments is described.

[0345] exist Fig.21 In the described access network node 2110, a first message is sent to the terminal, wherein the first message is used by the terminal to process first information, and the first information includes information that needs to be stored by the terminal and the core network node. Since the first information includes information that needs to be stored by the terminal and the core network node, when the first information is the cell information of the terminal that was last served, the terminal processes the last cell information stored by it, so that the last cell information stored by the terminal is consistent with the last cell information stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last cell served by it, and then receive the paging according to the wake-up signal; and / or the first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal. Since the first data includes data sent by the terminal to the access network node before receiving the first message from the access network node, if the first data is not sent successfully, the first data can be retransmitted to the access network node according to the first message, thereby ensuring that the first data can be successfully sent.

[0346] Alternatively, the processor 2112 in the access network node 2110 is used to read the program code stored in the memory 2113 and perform the following operations: sending a wireless resource control release message to the terminal and sending a first S1 interface application protocol message or a first NG interface application protocol message to the core network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time.

[0347] It should be noted that the implementation of each operation can also refer to Figure 8 or Fig. 9 The corresponding description of the method embodiments is described.

[0348] exist Fig.21In the described access network node 2110, a wireless resource control release message is sent to the terminal. After receiving the wireless resource control release message, the terminal will release the wireless resource control connection and update the last served cell information stored in it, that is, the cell information of the current access to the access network node is saved as the last served cell information; in addition, the cell information of the current access to the access network node by the terminal is sent to the core network node through the first S1 interface application protocol message or the first NG interface application protocol message. In this way, the last served cell information stored by the terminal can be consistent with the last served cell information of the terminal stored by the core network node, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored in it, and then receive paging according to the wake-up signal.

[0349] Alternatively, the processor 2112 in the access network node 2110 is used to read the program code stored in the memory 2113 and perform the following operations: receive a wireless resource control connection request message from a terminal; send a second S1 interface application protocol message or a second NG interface application protocol message to a core network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal; receive a third S1 interface application protocol message or a third NG interface application protocol message from the core network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports a control plane cellular Internet of Things or whether the terminal supports a user plane cellular Internet of Things; if the terminal only supports a control plane cellular Internet of Things or the terminal does not support a user plane cellular Internet of Things, send a wireless resource control connection rejection message to the terminal.

[0350] It should be noted that the implementation of each operation can also refer to Fig.10 or Fig.11 The corresponding description of the method embodiments is described.

[0351] exist Fig.21In the described access network node 2110, after receiving the radio resource control connection request message of the terminal, a second S1 interface application protocol message or a second NG interface application protocol message is sent to the core network node to inform the core network node of the terminal identifier; the core network node can determine whether the terminal is a terminal that only supports the control plane cellular Internet of Things or a terminal that supports the user plane cellular Internet of Things through the identifier of the terminal; then the core network node sends a third S1 interface application protocol message or a third NG interface application protocol message to the access network node to inform whether the terminal is a terminal that only supports the control plane cellular Internet of Things or a terminal that supports the user plane cellular Internet of Things. The access network node is informed of the result of the terminal of the cellular Internet of Things; if the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, the access network node directly rejects the wireless resource control connection request of the terminal; since the wireless resource control connection request initiated by the terminal is rejected, the terminal does not successfully access the network, then the terminal will not update its stored last served cell information, so that the last served cell information stored on the terminal side is consistent with the last served cell information stored on the network side, which is beneficial for the terminal to monitor the wake-up signal in the last served cell stored, and then receive paging according to the wake-up signal.

[0352] See also Fig. 22 , Fig. 22 It is a structural diagram of a core network node provided in an embodiment of the present application. The core network node 2210 includes a transceiver 2211, a processor 2212 and a memory 2213. The transceiver 2211, the processor 2212 and the memory 2213 are interconnected via a bus 2214.

[0353] The memory 2213 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read only memory (EPROM), or portable read only memory (CD-ROM), and the memory 2213 is used for related instructions and data.

[0354] The transceiver 2211 is used to receive and send data.

[0355] The processor 2212 may be one or more central processing units (CPUs). When the processor 2212 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0356] The processor 2212 in the core network node 2210 is used to read the program code stored in the memory 2213 and perform the following operations: receive a first S1 interface application protocol message or a first NG interface application protocol message from an access network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time, and the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; store the cell information of the terminal accessing the access network node this time.

[0357] It should be noted that the implementation of each operation can also refer to Figure 8 or Fig. 9 The corresponding description of the method embodiments is described.

[0358] exist Fig. 22 In the described core network node 2210, the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate the S1 interface association or NG interface association of the terminal; that is, when the access network node sends the first S1 interface application protocol message or the first NG interface application protocol message to the core network node, it will not establish the S1 interface association or NG interface association with the terminal between the core network and the access network, or will not activate the S1 interface association or NG interface association with the terminal between the core network and the access network. Therefore, in this implementation manner, even if the S1 interface association or NG interface association with the terminal is not established or activated between the core network and the access network, the access network node can send the cell information of the terminal accessing the access network node to the core network node.

[0359] Alternatively, the processor 2212 in the core network node 2210 is used to read the program code stored in the memory 2213 and perform the following operations: receiving a second S1 interface application protocol message or a second NG interface application protocol message from an access network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal; sending a third S1 interface application protocol message or a third NG interface application protocol message to the access network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports control plane cellular Internet of Things or whether the terminal supports user plane cellular Internet of Things.

[0360] It should be noted that the implementation of each operation can also refer to Fig.10 or Fig.11 The corresponding description of the method embodiments is described.

[0361] exist Fig. 22 In the described core network node 2210, the access network node sends the terminal identifier to the core network node through a second S1 interface application protocol message or a second NG interface application protocol message, and the core network node can inform the access network node through a third S1 interface application protocol message or a third NG interface application protocol message whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

[0362] An embodiment of the present application also provides a chip, which includes at least one processor, a memory and an interface circuit, wherein the memory, the transceiver and the at least one processor are interconnected via lines, and a computer program is stored in the at least one memory; when the computer program is executed by the processor, the method flow shown in the above method embodiment is implemented.

[0363] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. When the computer-readable storage medium is run on a network device or a terminal, the method flow shown in the above method embodiment is implemented.

[0364] The embodiment of the present application also provides a computer program product. When the computer program product is run on a network device or a terminal, the method flow shown in the above method embodiment is implemented.

[0365] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0366] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus random access memory (Direct Rambus RAM, DR RAM).

[0367] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) is integrated in the processor.

[0368] It should be noted that the memory described herein is intended to include, but not be limited to, these and any other suitable types of memory.

[0369] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0370] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this specification can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0371] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0372] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0373] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0374] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0375] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0376] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs. In addition, the terms and explanations in each embodiment of the present application can refer to the corresponding descriptions in other embodiments.

[0377] The modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0378] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A communication method, characterized in that: The method comprises: receiving a first message from an access network node; Processing the information of the cell last served by the terminal according to the first message, wherein the processing includes: not updating the information of the cell last served by the terminal, or saving the cell information of the last access of the terminal to the access network node as the information of the cell last served by the terminal; and / or First data is processed according to the first message, wherein the first data includes data sent to the access network node before receiving the first message from the access network node.

2. The method according to claim 1, characterized in that The first message includes first indication information, and the first indication information is used to indicate at least one of the following: radio resource control connection rejection; radio resource control connection failure; radio resource control connection release; radio resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's current access; Access failure; access rejection; the access network node does not send the first data to the core network node.

3. The method according to claim 1 or 2, characterized in that: After processing the information of the cell last served by the terminal according to the first message, the method further includes: If the terminal is located in the cell corresponding to the information of the cell served last by the terminal, the terminal monitors the wake-up signal and receives paging according to the wake-up signal.

4. The method according to claim 1 or 2, characterized in that: After processing the information of the cell last served by the terminal according to the first message, the method further includes: If the terminal is located in the first cell, the wake-up signal is not monitored, wherein the first cell does not include the cell corresponding to the information of the cell served by the terminal last.

5. The method according to any one of claims 1 to 4, characterized in that: The first message is a radio resource control release message.

6. The method according to any one of claims 1 to 5, characterized in that: Information about the cell that the terminal was last served by is stored in the terminal.

7. The method according to any one of claims 1 to 6, characterized in that: The method is applied to a terminal or a chip in the terminal.

8. A communication method, characterized in that: The method comprises: Sending a first message to the terminal, wherein the first message is used by the terminal to process information of the cell last served by the terminal, and the processing includes: not updating the information of the cell last served by the terminal, or saving the cell information of the last access of the terminal to the access network node as the information of the cell last served by the terminal; and / or The first message is used by the terminal to process first data, and the first data includes data received from the terminal before sending the first message to the terminal.

9. The method according to claim 8, characterized in that The first message includes first indication information, and the first indication information is used to indicate at least one of the following: radio resource control connection rejection; radio resource control connection failure; radio resource control connection release; radio resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's current access; Access failure; access rejection; the access network node does not send the first data to the core network node.

10. The method according to claim 8 or 9, characterized in that: After sending the first message to the terminal, the method further includes: Receiving a paging message from a core network node, wherein the paging message includes information about a cell that the terminal was last served by; The wake-up signal is used when paging the terminal in the cell corresponding to the information of the cell served by the terminal last, wherein the wake-up signal is used to instruct the terminal to receive the paging.

11. The method according to claim 8 or 9, characterized in that: After sending the first message to the terminal, the method further includes: Receiving a paging message from a core network node, wherein the paging message includes information about a cell that the terminal was last served by; When paging the terminal in the first cell, no wake-up signal is used, wherein the wake-up signal is used to instruct the terminal to receive paging, and the first cell does not include the cell corresponding to the cell information last served by the terminal.

12. The method according to any one of claims 8 to 11, characterized in that The first message is a radio resource control release message.

13. The method according to any one of claims 8 to 12, characterized in that: The method is applied to an access network node or a chip in the access network node.

14. A communication method, characterized in that: The method comprises: A radio resource control release message is sent to the terminal and a first S1 interface application protocol message or a first NG interface application protocol message is sent to the core network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes the cell information of the terminal accessing the access network node this time.

15. The method according to claim 14, characterized in that The method further comprises: Receiving an overload start message from the core network node, wherein the overload start message is used to indicate that access by a terminal that only supports the control plane cellular Internet of Things is not accepted; Receive a second message from the terminal, wherein the second message includes second indication information, and the second indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

16. The method according to claim 15, characterized in that The sending of a radio resource control release message to the terminal and the sending of a first S1 interface application protocol message or a first NG interface application protocol message to the core network node include: If the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, a wireless resource control release message is sent to the terminal and a first S1 interface application protocol message or a first NG interface application protocol message is sent to the core network node.

17. The method according to any one of claims 14 to 16, characterized in that: The radio resource control release message includes first indication information, and the first indication information is used to indicate at least one of the following: radio resource control connection rejection; radio resource control connection failure; radio resource control connection release; radio resource control connection not established; the core network node is not connected; the core network node is not aware of the terminal's current access; Access failed; Access denied; The access network node does not send first data to the core network node, wherein the first data includes data sent by the terminal to the access network node.

18. The method according to claim 17, characterized in that The first indication information is used by the terminal to process first data, where the first data includes data received from the terminal before a radio resource control release message is sent to the terminal.

19. The method according to any one of claims 14 to 18, characterized in that The method is applied to an access network node or a chip in the access network node.

20. A communication method, characterized in that: The method comprises: Receiving a first S1 interface application protocol message or a first NG interface application protocol message from an access network node, wherein the first S1 interface application protocol message or the first NG interface application protocol message includes cell information of a terminal accessing the access network node this time, and the first S1 interface application protocol message or the first NG interface application protocol message does not establish or activate an S1 interface association or NG interface association of the terminal; The cell information of the access network node accessed by the terminal this time is stored.

21. The method according to claim 20, characterized in that The method is applied to a core network node or a chip in a core network node.

22. A communication method, characterized in that: The method comprises: receiving a radio resource control connection request message from a terminal; Sending a second S1 interface application protocol message or a second NG interface application protocol message to a core network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal; Receiving a third S1 interface application protocol message or a third NG interface application protocol message from the core network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal supports only the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things; If the terminal only supports the control plane cellular Internet of Things or the terminal does not support the user plane cellular Internet of Things, a wireless resource control connection rejection message is sent to the terminal.

23. The method according to claim 22, characterized in that The method is applied to an access network node or a chip in the access network node.

24. A communication method, characterized in that: The method comprises: receiving a second S1 interface application protocol message or a second NG interface application protocol message from an access network node, wherein the second S1 interface application protocol message or the second NG interface application protocol message includes an identifier of the terminal; A third S1 interface application protocol message or a third NG interface application protocol message is sent to the access network node, wherein the third S1 interface application protocol message or the third NG interface application protocol message includes third indication information, and the third indication information is used to indicate whether the terminal only supports the control plane cellular Internet of Things or whether the terminal supports the user plane cellular Internet of Things.

25. The method according to claim 24, characterized in that The second S1 interface application protocol message or the second NG interface application protocol message, and the third S1 interface application protocol message or the third NG interface application protocol message do not establish or activate the S1 interface association or NG interface association of the terminal.

26. The method according to claim 24 or 25, characterized in that The method is applied to a core network node or a chip in a core network node.

27. A communication device, characterized in that: The communication device includes a unit for executing the method as described in any one of claims 1 to 7, or the communication device includes a unit for executing the method as described in any one of claims 8 to 13, or the communication device includes a unit for executing the method as described in any one of claims 14 to 19, or the communication device includes a unit for executing the method as described in claim 20 or 21, or the communication device includes a unit for executing the method as described in claim 22 or 23, or the communication device includes a unit for executing the method as described in any one of claims 24 to 26.

28. A terminal, characterized in that: The method comprises a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the programs include instructions for executing the steps in the method according to any one of claims 1 to 7.

29. An access network node, characterized in that: It includes a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the programs include instructions for executing the steps in the method as described in any one of claims 8-13 or 14-19 or 22-23.

30. A core network node, characterized in that: It includes a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the programs include instructions for executing the steps in the method as described in any one of claims 20-21 or 24-26.

31. A chip, characterized in that: The chip includes a processor, and the processor calls and runs a computer program from a memory, so that a device equipped with the chip executes the method according to any one of claims 1 to 26.

32. A communication system, characterized in that: The communication system includes a terminal device and an access network node, the terminal device is used to execute the method as described in any one of claims 1-7, and / or the access network node is used to execute the method as described in any one of claims 8-13 or 14-19 or 22-23.

33. The communication system according to claim 32, characterized in that The communication system also includes a core network node, which is used to execute the method described in any one of claims 20-21 or 24-26.

34. A computer storage medium, characterized in that The computer storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 26 is implemented.

35. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is run on a computer, the method according to any one of claims 1 to 26 is implemented.

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