System message updating method and apparatus, and related system

Abstract

The present application provides a system message updating method and apparatus, and a related system. The method comprises: when first indication information is received, sending a first system message request to request a first system message, wherein the first indication information is used for indicating system message updating. The technical solution provided by the present application can realize the network energy saving of first system message change.

Description

Method, apparatus and related system for system information update

[0001] The present application claims priority to the Chinese patent application No. 202410551251.2, filed on April 30, 2024, entitled "Method, apparatus and related system for first system information request" and the Chinese patent application No. 202410934131.0, filed on July 11, 2024, entitled "Method, apparatus and related system for system information update", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of wireless communication, and in particular to a method, apparatus and related system for system information update. BACKGROUND

[0003] System information block type 1 (SIB1) is an important system information block in the 5th generation mobile networks (5G) system, which contains important information such as cell selection, cell configuration, and scheduling and changes of other system broadcast messages.

[0004] The current SIB1 is periodically transmitted in the cell, and the transmission period is between 20ms and 160ms. The transmission occasion of SIB1 can be determined by the configuration parameters in the master control information (MIB) and the downlink scheduling of the network side. Based on the energy saving requirements of the 5G network, the network side is allowed to transmit SIB1 non-periodically in the network energy saving (NES) topic, and when the terminal device needs to obtain SIB1, a first system broadcast message request is transmitted, for example, the terminal device transmits an uplink-wake up signaling (UL-WUS) to the network side, and the network side transmits SIB1 after receiving the UL-WUS request from the terminal device, which is called on demand SIB1 (OD-SIB1). OD-SIB1 reduces the transmission of SIB1 by the network side to save network power. Among them, for the cell that does not periodically transmit SIB1, the terminal device in the idle / inactive mode can request SIB1 through the request of OD-SIB1, which can be called NES cell.

[0005] The network side can send a paging of system message update to the terminal device within a modification period (MP) of SIB1 of the cell, and send the updated SIB1 within a next MP of the MP in which the paging is sent. In this case, there is a possible scenario that when the SIB1 is changed, if there is no terminal device camping on the NES cell, the NES cell sends the updated SIB1, and no terminal device receives the updated SIB1 sent by the NES cell, which causes resource waste. Therefore, how to realize network energy saving is a problem to be solved. SUMMARY

[0006] Embodiments of the present application provide a method, apparatus and related system for system message update. A terminal device can trigger a request message to obtain valid first system message when it needs to obtain the first system message, thereby realizing network energy saving.

[0007] In a first aspect, the present application provides a method for system message update. The method can be applied to a terminal device, an apparatus (for example, a chip, or a chip system, or a circuit) in the terminal device, or an apparatus that can be used with the terminal device. Hereinafter, the method is described by taking the terminal device as an example. The method can include: receiving first indication information, sending a first system message request to request a first system message, and the first indication information is used to indicate system message update.

[0008] The network side can send indication information (for example, the first indication information) of system message update to the terminal device. Unlike the prior art in which the network side continues to send the updated first system message after sending the indication information, in the embodiments of the present application, the terminal device can send a first system message request to request a first system message after receiving the indication information of system message update from the network side. That is, when the first system message is changed, the terminal device needs to actively request the first system message, thereby avoiding the situation that the network side sends the updated first system message without any terminal device receiving it, and thus causing resource waste. Therefore, network energy saving can be realized when the first system message is changed.

[0009] In a possible implementation, receiving the first indication information and sending the first system message request to request the first system message include: if the terminal device does not detect the updated first system message after receiving the first indication information, sending the first system message request to request the first system message.

[0010] Through the embodiments of the present application, in the case that the terminal device receives the first indication information, the first system message can be detected, if the terminal device detects the first system message, the first system message request can not be sent; if the terminal device does not detect the first system message, the first system message request is sent, thereby the signaling overhead can be saved.

[0011] In a possible implementation, in the case that the first indication information is received, the first system message request is sent to request the first system message, comprising: in the case that the first indication information is received, if the terminal device detects the updated first system message, the first system message request is not sent to request the first system message.

[0012] In a possible implementation, the terminal device detecting the updated first system message comprises: the terminal device detecting the related information of the first system message, if the stored related information of the first system message and the detected related information of the first system message are same, it is determined that the updated first system message is not detected; or, the terminal device does not receive the first system message, it is determined that the updated first system message is not detected; or, the terminal device receives the first indication information and does not detect the first system message within a preset time, it is determined that the updated first system message is not detected; wherein, the preset time is the time from receiving the first indication information to sending the first system message request; or, the terminal device detects the related information of the first system message, if the stored related information of the first system message and the detected related information of the first system message are different, it is determined that the updated first system message is detected; or, the terminal device receives the first system message, it is determined that the updated first system message is detected; or, the terminal device receives the first indication information and detects the first system message within a preset time, it is determined that the updated first system message is detected.

[0013] Through the embodiments of the present application, several implementation manners of the terminal device detecting the updated first system message can be provided, thereby the terminal device can flexibly select the implementation of detecting the updated first system message. The related information of the first system message can comprise the version number of the first system message and the content information included in the first system message, and the content information included in the first system message can comprise cell reselection information, cell selection information, information of a neighbor cell, access control information, etc.

[0014] In a possible implementation, the preset time is before the end of the next MP of the MP in which the first indication information is received.

[0015] In a possible implementation, in the case that the first indication information is received, the first system message request is sent to request the first system message, comprising: in the case that the first indication information is received, the first system message request is sent to request the first system message within a first time.

[0016] In a possible implementation, the first time is a time point of a latest resource capable of sending the first system message request after receiving the first indication information, the time point of the latest resource capable of sending the first system message request is a time interval between a time point of the resource and a time point of receiving the first indication information, the time point of the resource is a system frame number, a subframe, a time slot or a symbol of the resource, and the time point of the resource is a start time point or an end time point of the resource; or the first time is a current MP of a change period MP in which the first indication information is received; or the first time is a time point of a latest resource capable of sending the first system message request after the first indication information is received in the current MP; or the first time is a next MP of the change period MP in which the first indication information is received; or the first time is before a T1 time of the next MP of the change period MP in which the first indication information is received; or the first time is a preset time length after the first indication information is received, or the first time is a preset time length after a start time of the next MP of the change period MP in which the first indication information is received.

[0017] By means of the embodiments of the present application, an implementation mode of when a terminal device sends a first system message request after receiving first indication information can be provided, so that the terminal device can select a sending time according to its own needs, and the flexibility of the scheme is increased.

[0018] In a possible implementation, the resource is a random access resource, an uplink grant resource or an uplink resource, and the random access resource is a contention random access resource, a non-contention random access resource or a dedicated random access resource.

[0019] In a possible implementation, the resource is a contention random access resource, and sending the first system message request includes sending the first system message request through a random access message 3; or the resource is a non-contention random access resource, and sending the first system message request includes sending the first system message request through a random access preamble, and the random access preamble is used to request the first system message.

[0020] In a possible implementation, the method further includes receiving a random access response, and the random access response is used to indicate that random access is successful.

[0021] In a possible implementation, the method further includes receiving an updated first system message.

[0022] In a possible implementation, the first indication information is included in a paging message or a short message.

[0023] In a possible implementation, the first indication information is included in a short message field in a downlink control information (DCI) format 1_0.

[0024] In a possible implementation, the first system message is SIB1.

[0025] In a possible implementation, the first system message request is SIB1 or WUS on demand.

[0026] In a second aspect, the present application provides a method for system message updating, which can be applied to a network device, a device (for example, a chip, or a chip system, or a circuit) in the network device, or a device capable of being matched with the network device. Hereinafter, the method applied to the network device is described as an example. The method can include: sending first indication information to a terminal device, the first indication information being used for indicating system message change; and in a case where a first system message request is received from the terminal device, sending an updated first system message.

[0027] The network side can send indication information (for example, the first indication information) of system message updating to the terminal device. Different from the prior art in which the network side continues to send the updated first system message after sending the indication information, in the present application embodiment, the network device sends the updated first system message again in a case where the first system message request is received from the terminal device after sending the indication information. That is, when the first system message changes, the terminal device needs to actively request the first system message, thereby avoiding the waste of resources caused by the fact that the network side sends the updated first system message without the terminal device receiving, and thus network energy saving of the first system message change can be achieved.

[0028] It should be understood that the execution subject of the second aspect can be the network device, the specific content of the second aspect corresponds to the content of the first aspect, and the corresponding features and beneficial effects of the second aspect can be referred to the description of the first aspect. To avoid repetition, the detailed description is appropriately omitted here.

[0029] In a possible implementation, the method can further include: in a case where the first system message request is not received from the terminal device, not sending the first system message or not paging the terminal device.

[0030] In a possible implementation, in the case where the first system message request is received from the terminal device, the updated first system message is sent, including: in the case where the first system message request is received from the terminal device, the updated first system message is sent within a second time.

[0031] In a possible implementation, the second time is a next MP or next two MPs of an MP of the first indication information; or the second time is a T2 time of the next MP of the MP of the first indication information; or the second time is a preset time after the first system message request is received from the terminal device.

[0032] A possible implementation, not receiving the first system message request from the terminal device, not sending the first system message, comprising: not sending the updated first system message in the next MP of the MP of the first indication information, without receiving the first system message request from the terminal device.

[0033] A possible implementation, receiving the first system message request from the terminal device, comprising: receiving the first system message request from the terminal device through a random access resource, an uplink grant resource or an uplink resource, the random access resource being a contention random access resource, a non-contention random access resource or a dedicated random access resource.

[0034] A possible implementation, the resource is a contention random access resource, receiving the first system message request from the terminal device comprises: receiving the first system message request through a random access message 3; or, the resource is a non-contention random access resource, receiving the first system message request from the terminal device comprises: receiving the first system message request through a random access preamble, the random access preamble being used to request the first system message.

[0035] A possible implementation, the method can further comprise: sending a random access response, the random access response being used to indicate that the random access is successful.

[0036] A possible implementation, the first indication information is included in a paging message or a short message.

[0037] A possible implementation, the first indication information is included in a short message field in the DCI format 1_0.

[0038] A possible implementation, the first system message is SIB1.

[0039] A possible implementation, the first system message request is on-demand SIB1 or WUS.

[0040] In a third aspect, the present application provides a system message updating method, which can be applied to a terminal device, an apparatus (for example, a chip or a chip system or a circuit) in the terminal device, or an apparatus capable of being matched with the terminal device, which is described below by taking the application to the terminal device as an example. The method can comprise: sending first information, the first information being used to request to determine whether a first system message is valid.

[0041] In the embodiment of the present application, the terminal device can actively send the first information to the network device to request whether the first system message is valid, the network device determines whether the first system message is valid, and in the case that the first system message is invalid, the network device sends the updated first system message to the terminal device, so that the resource waste caused by the case that the network device sends the updated first system message but no terminal device receives the updated first system message can be avoided, and thus the network energy saving of the first system message change can be realized.

[0042] In a possible implementation, the sending the first information comprises periodically sending the first information.

[0043] In a possible implementation, the periodically sending the first information comprises periodically sending the first information within a first time length, one period is an MP of the cell, and the first time length is less than the MP of the cell.

[0044] In a possible implementation, the sending the first information comprises sending the first information through a random access resource, an uplink grant resource or an uplink resource, and the random access resource is a contention random access resource or a non-contention random access resource.

[0045] In a possible implementation, the resource is the contention random access resource, the sending the first information comprises sending the first information through a random access message 3; or the resource is the non-contention random access resource, and the sending the first information comprises sending the first information through a random access preamble, and the random access preamble is used to indicate the first information.

[0046] In a possible implementation, the method further comprises receiving a random access response, and the random access response is used to indicate that the random access is successful.

[0047] In a possible implementation, the first system message is SIB1.

[0048] In a fourth aspect, the present application provides a system message updating method, which can be applied to a network device, can be applied to an apparatus (for example, a chip, or a chip system, or a circuit) in the network device, or is an apparatus capable of being matched with the network device, and is described below by taking the application to the network device as an example. The method can comprise the following steps: receiving first information, determining whether a first system message is valid, the first information being used to request to determine whether the first system message is valid; if it is determined that the first system message is invalid, broadcasting the first system message to a terminal device and / or sending second information, the second information being used to indicate whether the first system message is valid.

[0049] In the embodiment of the present application, the network device receives the first information sent by the terminal device actively, and determines whether the first system message is valid according to the first information. According to the active information interaction of the terminal device, the resource waste caused by the network device sending information to the terminal device without the terminal device receiving the information can be avoided, and thus the network energy saving of the first system message change can be realized. Further, the network device determines to send the updated first system message to the terminal device in the case that the first system message is invalid, so that the resource waste caused by the network device sending the updated first system message without the terminal device receiving the information can be avoided, and thus the network energy saving of the first system message change can be realized.

[0050] It should be understood that the execution subject of the fourth aspect can be the network device, the specific content of the fourth aspect corresponds to the content of the third aspect, and the corresponding features and beneficial effects of the fourth aspect can be referred to the description of the third aspect. To avoid repetition, the detailed description is appropriately omitted here.

[0051] In a possible implementation, the method can further include: if it is determined that the first system message is valid, broadcasting a confirmation message to the terminal device, the confirmation message being used to confirm that the first system message is valid.

[0052] In a possible implementation, the first system message being valid includes: if it is detected that the related information of the first system message is the same as the related information of the first system message used by the terminal device, the first system message is valid; or if it is detected that the related information of the first system message is different from the related information of the first system message used by the terminal device, the first system message is invalid.

[0053] In a possible implementation, the receiving of the first information includes: receiving the first information through a random access resource, an uplink grant resource or an uplink resource, the random access resource being a contention random access resource or a non-contention random access resource.

[0054] In a possible implementation, the resource is the contention random access resource, and the receiving of the first information includes: receiving the first information through a random access message 3; or the resource is the non-contention random access resource, and the receiving of the first information includes: receiving the first information through a random access preamble, the random access preamble being used to indicate the first information.

[0055] In a possible implementation, the method can further include: sending a random access response, the random access response being used to indicate that the random access is successful.

[0056] In a possible implementation, the first system message is SIB1.

[0057] In a fifth aspect, an embodiment of the present application provides a communication apparatus, which can be a terminal device or a device (for example, a chip or a chip system or a circuit) in a terminal device.

[0058] The beneficial effects can refer to the description of the first aspect, which will not be repeated here. The apparatus has functions to implement the behaviors in the method embodiments of the first aspect. The functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0059] In a possible implementation, the communication apparatus can include:

[0060] The transceiver receives first indication information and sends a first system message request to request a first system message, where the first indication information is used to indicate system message update.

[0061] In a possible implementation, the transceiver receives first indication information and sends a first system message request to request a first system message, specifically for: in the case of receiving the first indication information, if the terminal device does not detect an updated first system message, the first system message request is sent to request the first system message.

[0062] In a possible implementation, the transceiver receives first indication information and sends a first system message request to request a first system message, specifically for: in the case of receiving the first indication information, if the terminal device detects an updated first system message, the first system message request is not sent to request the first system message.

[0063] In a possible implementation, the communication apparatus can further include a processing unit that detects an updated first system message, specifically for: detecting related information of the first system message, if the stored related information of the first system message and the detected related information of the first system message are the same, determining that the updated first system message is not detected; or, the terminal device does not receive the first system message, determining that the updated first system message is not detected; or, the terminal device receives the first indication information and does not detect the first system message within a preset time, determining that the updated first system message is not detected; where the preset time is the time from receiving the first indication information to sending the first system message request; or, detecting the related information of the first system message, if the stored related information of the first system message and the detected related information of the first system message are different, determining that the updated first system message is detected; or, the transceiver receives the first system message, determining that the updated first system message is detected; or, the transceiver receives the first indication information and detects the first system message within a preset time, determining that the updated first system message is detected.

[0064] In a possible implementation, the preset time is before the end of the next MP of the MP in which the first indication information is received.

[0065] In a possible implementation, the transceiver receives the first indication information, and sends the first system message request to request the first system message, specifically: after receiving the first indication information, the transceiver sends the first system message request to request the first system message within the first time.

[0066] In a possible implementation, the first time is a time point of a resource closest to the time point at which the first indication information is received and at which the first system message request can be sent, the time point of the resource closest to the time point at which the first indication information is received and at which the first system message request can be sent is a time interval between the time point of the resource and the time point at which the first indication information is received; the time point is a system frame number, a subframe, a time slot, or a symbol of the resource, and the time point is a start time point or an end time point of the resource; or the first time is a current MP of a change period MP in which the first indication information is received; or the first time is a time point of a resource closest to the time point at which the first indication information is received and at which the first system message request can be sent within the current MP; or the first time is a next MP of the change period MP in which the first indication information is received; or the first time is before a T1 time of the next MP of the change period MP in which the first indication information is received; or the first time is a preset time length after the time point at which the first indication information is received, or the first time is a preset time length after a start time of the next MP of the change period MP in which the first indication information is received.

[0067] In a possible implementation, the resource is a random access resource, an uplink grant resource, or an uplink resource, and the random access resource is a contention random access resource, a non-contention random access resource, or a dedicated random access resource.

[0068] In a possible implementation, the resource is a contention random access resource, and the transceiver sends the first system message request, specifically: the first system message request is sent through a random access message 3; or the resource is a non-contention random access resource, and the transceiver sends the first system message request, specifically: the first system message request is sent through a random access preamble, and the random access preamble is used to request the first system message.

[0069] In a possible implementation, the transceiver is further configured to receive a random access response, and the random access response is used to indicate that the random access is successful.

[0070] In a possible implementation, the transceiver is further configured to receive an updated first system message.

[0071] In a possible implementation, the first indication information is included in a paging message or a short message.

[0072] In a possible implementation, the first indication information is included in a short message field in the DCI format 1_0.

[0073] In a possible implementation, the first system message is SIB1.

[0074] In a possible implementation, the first system message request is on-demand SIB1 or WUS.

[0075] In a sixth aspect, an embodiment of the present application provides a communication apparatus, which can be a network device or a device (for example, a chip, a chip system, or a circuit) in the network device.

[0076] The beneficial effects can refer to the description of the second aspect, which will not be repeated here. The apparatus has the function of implementing the behaviors in the method examples of the above-mentioned second aspect. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

[0077] In a possible implementation, the communication apparatus can include:

[0078] The transceiver is configured to send, to a terminal device, first indication information, where the first indication information is used to indicate a system message change.

[0079] The transceiver is further configured to, in a case where a first system message request is received from the terminal device, send an updated first system message.

[0080] In a possible implementation, the transceiver is further configured to, in a case where the first system message request is not received from the terminal device, not send the first system message or not page the terminal device.

[0081] In a possible implementation, the transceiver is further configured to, in a case where the first system message request is received from the terminal device, send the updated first system message, specifically configured to: in a case where the first system message request is received from the terminal device, send the updated first system message within a second time.

[0082] In a possible implementation, the second time is a next MP or next two MPs of an MP of the first indication information; or the second time is a T2 time of the next MP of the MP of the first indication information; or the second time is a preset time after the first system message request is received from the terminal device.

[0083] In a possible implementation, the transceiver does not send the first system message in a case where the first system message request from the terminal device is not received, and specifically configured to: in a case where the first system message request from the terminal device is not received, not send the updated first system message in a next MP of the MPs of the first indication information.

[0084] In a possible implementation, the transceiver receives the first system message request from the terminal device, and specifically configured to: receive the first system message request from the terminal device through a random access resource, an uplink grant resource, or an uplink resource, wherein the random access resource is a contention random access resource, a non-contention random access resource, or a dedicated random access resource.

[0085] In a possible implementation, the resource is the contention random access resource, and the transceiver receives the first system message request from the terminal device, and specifically configured to: receive the first system message request through a random access message 3; or, the resource is the non-contention random access resource, and the transceiver receives the first system message request from the terminal device, and specifically configured to: receive the first system message request through a random access preamble, wherein the random access preamble is used to request the first system message.

[0086] In a possible implementation, the transceiver is further configured to send a random access response, wherein the random access response is used to indicate that the random access is successful.

[0087] In a possible implementation, the first indication information is included in a paging message or a short message.

[0088] In a possible implementation, the first indication information is included in a short message field in a DCI format 1_0.

[0089] In a possible implementation, the first system message is an SIB1.

[0090] In a possible implementation, the first system message request is an on-demand SIB1 or a WUS.

[0091] In a seventh aspect, an embodiment of the present application provides a communication apparatus, which can be a terminal device or a device (for example, a chip or a chip system or a circuit) in the terminal device.

[0092] The beneficial effects can be referred to the description of the third aspect, which will not be repeated here. The apparatus has the functions of implementing the behaviors in the method examples of the third aspect. The functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions.

[0093] In a possible implementation, the communication apparatus can include:

[0094] transmitting a first information, the first information being used for requesting to determine whether a first system message is valid.

[0095] In a possible implementation, the transceiver transmits the first information, and specifically, periodically transmits the first information.

[0096] In a possible implementation, the transceiver periodically transmits the first information, and specifically, periodically transmits the first information within a first time length, one period being an MP of a cell, and the first time length being less than the MP of the cell.

[0097] In a possible implementation, the transceiver transmits the first information, and specifically, transmits the first information through a random access resource, an uplink grant resource, or an uplink resource, the random access resource being a contention random access resource or a non-contention random access resource.

[0098] In a possible implementation, the resource is the contention random access resource, and the transmitting the first information includes: transmitting the first information through a random access message 3; or the resource is the non-contention random access resource, and the transmitting the first information includes: transmitting the first information through a random access preamble, the random access preamble being used for indicating the first information.

[0099] In a possible implementation, the transceiver further receives a random access response, the random access response being used for indicating that random access is successful.

[0100] In a possible implementation, the first system message is SIB1.

[0101] In an eighth aspect, an embodiment of the present application provides a communication apparatus, which can be a network device or a device (for example, a chip, a chip system, or a circuit) in the network device.

[0102] The beneficial effects can refer to the description of the fourth aspect, which will not be repeated here. The apparatus has the function of implementing the behaviors in the method examples of the fourth aspect. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0103] In a possible implementation, the communication apparatus can include:

[0104] a transceiver, configured to receive a first information, and determine whether a first system message is valid, the first information being used for requesting to determine whether the first system message is valid.

[0105] If it is determined that the first system message is invalid, the transceiver is further configured to broadcast the first system message to the terminal device and / or send second information, the second information being used to indicate whether the first system message is valid.

[0106] In a possible implementation, if it is determined that the first system message is valid, the transceiver is further configured to broadcast a confirmation message to the terminal device, the confirmation message being used to confirm that the first system message is valid.

[0107] In a possible implementation, the first system message being valid includes: if it is detected that the relevant information of the first system message is the same as the relevant information of the first system message used by the terminal device, the first system message is valid; or if it is detected that the relevant information of the first system message is different from the relevant information of the first system message used by the terminal device, the first system message is invalid.

[0108] In a possible implementation, the transceiver receives the first information, and specifically receives the first information through a random access resource, an uplink grant resource, or an uplink resource, the random access resource being a contention random access resource or a non-contention random access resource.

[0109] In a possible implementation, the resource is the contention random access resource, and the transceiver receives the first information, and specifically receives the first information through a random access message 3; or the resource is the non-contention random access resource, and the transceiver receives the first information, and specifically receives the first information through a random access preamble, the random access preamble being used to indicate the first information.

[0110] In a possible implementation, the transceiver is further configured to send a random access response, the random access response being used to indicate that the random access is successful.

[0111] In a possible implementation, the first system message is SIB1.

[0112] In a ninth aspect, a communication apparatus is provided, which can be a terminal device or a device (for example, a chip, or a chip system, or a circuit) in the terminal device. The apparatus can include a processor, a memory, an input interface, and an output interface, the input interface being configured to receive information from other communication apparatuses outside the apparatus, the output interface being configured to output information to the other communication apparatuses outside the apparatus, and the processor being configured to invoke a computer program stored in the memory to execute the system message updating method in the first aspect or any of the implementations of the first aspect, or the third aspect or any of the implementations of the third aspect.

[0113] In a tenth aspect, a communication apparatus is provided, which can be a network device or a device (e.g., a chip or a chip system or a circuit) in a network device. The apparatus can include a processor, a memory, an input interface and an output interface, the input interface being configured to receive information from other communication apparatuses outside the apparatus, the output interface being configured to output information to other communication apparatuses outside the apparatus, and the processor being configured to invoke the computer program stored in the memory to perform the method of system information updating according to the second aspect or any of the implementation forms of the second aspect or the fourth aspect or any of the implementation forms of the fourth aspect.

[0114] In an eleventh aspect, a communication system is provided, which includes at least one terminal device and at least one network device, and when the at least one terminal device and the at least one network device operate in the system, the method of system information updating according to any of the first aspect or any of the implementation forms of the first aspect or any of the second aspect or any of the implementation forms of the second aspect or any of the third aspect or any of the implementation forms of the third aspect or any of the fourth aspect or any of the implementation forms of the fourth aspect is performed.

[0115] In a twelfth aspect, a computer readable storage medium is provided, which stores computer instructions, and when the computer program or the computer instructions are executed, the method according to the first aspect or any of the implementation forms of the first aspect or any of the second aspect or any of the implementation forms of the second aspect or any of the third aspect or any of the implementation forms of the third aspect or any of the fourth aspect or any of the implementation forms of the fourth aspect is performed.

[0116] In a thirteenth aspect, a computer program product is provided, which includes executable instructions, and when the computer program product is executed on a communication device, the method according to the first aspect or any of the implementation forms of the first aspect or any of the second aspect or any of the implementation forms of the second aspect or any of the third aspect or any of the implementation forms of the third aspect or any of the fourth aspect or any of the implementation forms of the fourth aspect is performed.

[0117] In a fourteenth aspect, a communication apparatus is provided, which includes a processor and can further include a memory, and is configured to implement the method according to the first aspect or any of the implementation forms of the first aspect or any of the second aspect or any of the implementation forms of the second aspect or any of the third aspect or any of the implementation forms of the third aspect or any of the fourth aspect or any of the implementation forms of the fourth aspect. The apparatus can be a chip system, which can be composed of a chip or can include a chip and other discrete devices. BRIEF DESCRIPTION OF DRAWINGS

[0118] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows.

[0119] FIG. 1 is a schematic diagram of an architecture of a communication system 1000 to which the embodiments of the present application are applied.

[0120] Figure 2(a) is a flow diagram of a random access procedure according to an embodiment of the present application;

[0121] Figure 2(b) is a flow diagram of a random access procedure according to an embodiment of the present application;

[0122] Figure 2(c) is a diagram of a SIB1 update mechanism according to an embodiment of the present application;

[0123] Figure 2(d) is a diagram of a SIB1 update scenario according to an embodiment of the present application;

[0124] Figure 3 is a flow interaction diagram of a method according to an embodiment of the present application;

[0125] Figures 4-8 are diagrams of a first system message update scenario according to an embodiment of the present application;

[0126] Figure 9 is a diagram of a first system message no update scenario according to an embodiment of the present application;

[0127] Figures 10-13 are flow diagrams of a first system message update according to an embodiment of the present application;

[0128] Figure 14 is a flow interaction diagram of another method according to an embodiment of the present application;

[0129] Figures 15(a)-15(d) are diagrams of yet another first system message update scenario according to an embodiment of the present application;

[0130] Figures 16-19 are flow diagrams of yet another first system message update according to an embodiment of the present application;

[0131] Figure 20 is a diagram of a structure of a communication apparatus according to an embodiment of the present application;

[0132] Figure 21 is a diagram of a structure of yet another communication apparatus according to an embodiment of the present application;

[0133] Figure 22 is a diagram of a structure of a terminal device according to an embodiment of the present application. DETAILED DESCRIPTION

[0134] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0135] The terms "first" and "second" and the like in the description, claims and drawings of the application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises", "comprising", "includes", "including" and the like are to be construed open-ended, allowing for instances where there are equivalents to processes, methods, systems, products or devices that do not literally include the recited steps or elements, but are otherwise equivalent in function, result, or operation. Additionally, the terms "a" and "an" are defined as one or more unless explicitly stated otherwise.

[0136] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in to other embodiments.

[0137] In the present application, "at least one" means one or more, "multiple" means two or more, "at least two" means two or three and three or more, and "and / or" is used to describe the relationship between associated objects, indicating that there can be three relationships, for example, "A and / or B" can mean: only A, only B, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one" or the like means any combination of these items, including single or multiple combinations. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0138] In the present application, "sending information" can be understood as a device sending information to another device, or also can be understood as a logical module in a device sending information to another logical module. For example, "the access network device sending information" can be understood as the access network device sending information to another device (such as a terminal), or can be understood as a logical module 1 in the access network device sending information to a logical module 2 in the access network device.

[0139] In the present application, "receiving information" can be understood as a device receiving information from another device, or also can be understood as a logical module in a device receiving information from another logical module. For example, "the access network device receiving information" can be understood as the access network device receiving information from another device (such as a terminal), or can be understood as a logical module 1 in the access network device receiving information from a logical module 2 in the access network device.

[0140] In the present application, "sending information to (for example, a terminal)" can be understood as that the destination of the information is the terminal. It can include directly or indirectly sending information to the terminal. "Receiving information from (for example, a terminal)" or "receiving information from (for example, a terminal)" can be understood as that the source of the information is the terminal, and can include directly or indirectly receiving information from the terminal. The information can be processed as necessary between the source and the destination of the information, such as format change, etc., but the destination can understand the valid information from the source. Similar expressions in the present application can be understood similarly, and will not be repeated here.

[0141] In order to better understand the embodiments of the present application, first, the system architecture related to the embodiments of the present application will be introduced as follows:

[0142] The embodiments of the present application can be applied to long term evolution (LTE) system, 5th generation mobile communication (5G) system, 6th generation mobile communication (6G) system and other communication systems evolved after 5G, satellite communication and short-range wireless communication system. Among them, the wireless communication system mentioned in the embodiments of the present application includes but is not limited to: three application scenarios of 5G / 6G mobile communication system: enhanced mobile broadband (eMBB), ultra reliable low latency communication (URLLC) and massive machine type of communication (mMTC), long range (LoRa) system or vehicle networking system. The wireless communication system can include one or more access network devices and one or more terminal devices.

[0143] The following is an exemplary explanation with the system architecture shown in FIG. 1. As shown in FIG. 1, the communication system 1000 includes a radio access network (RAN) 100, a core network (CN) 200, and an Internet 300. The RAN 100 includes at least one network device (such as 110a and 110b in FIG. 1, collectively referred to as 110) and at least one terminal (such as 120a-120j in FIG. 1, collectively referred to as 120). The RAN 100 can also include other RAN nodes, such as a wireless relay device and / or a wireless backhaul device (not shown in FIG. 1), etc. The terminal 120 is connected to the network device 110 in a wireless manner. The devices in the core network 200 and the Internet 300 can also be referred to as network devices, and the network devices in the core network 200 and the network devices in the RAN 100 can be different physical devices respectively, or can be the same physical device integrated with the logical functions of the core network and the logical functions of the radio access network.

[0144] It should be noted that the RAN 100 can be a 3rd generation partnership project (3GPP) related cellular system, such as a 4G, 5G mobile communication system, or an evolved system after 5G (such as a 6G mobile communication system). The RAN 100 can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), etc. The RAN 100 can also be a communication system in which two or more of the above systems are integrated. It should be stated that the number of network devices and terminal devices in FIG. 1 is only illustrative and should not be considered as a specific limitation of the present application. The terminal devices and network devices involved in the system architecture will be described in detail below.

[0145] I. Terminal device

[0146] The terminal device can also be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), or the like, or a device for providing voice or data connectivity to a user, or an Internet of Things device. For example, the terminal device includes a handheld device having wireless connectivity, a vehicle-mounted device, or the like. Currently, the terminal device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile Internet device (MID), a wearable device (for example, a smart watch, a smart bracelet, a pedometer, or the like), a vehicle-mounted device (for example, a car, a bicycle, an electric vehicle, an airplane, a ship, a train, a high-speed rail, or the like), a satellite terminal, a virtual reality (VR) device, an augmented reality (AR) device, a smart point of sale (POS) machine, a customer-premises equipment (CPE), a wireless terminal in industrial control, a smart home device (for example, a refrigerator, a television, an air conditioner, an electricity meter, or the like), a smart robot, a mechanical arm, a workshop device, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, or a wireless terminal in a smart home, a flight device (for example, a smart robot, a hot air balloon, a drone, an airplane), or the like. The terminal device can also be other devices having a terminal function, for example, the terminal device can also be a device assuming a terminal function in D2D communication.

[0147] Embodiments of the present application do not limit the device form of the terminal, and the device for realizing the function of the terminal device can be the terminal device, or can be a device capable of supporting the terminal device to realize the function, such as a chip system. The device can be installed in the terminal device or used in matching with the terminal device. In embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0148] II. Network device

[0149] The network device is a node in a radio access network (RAN), and can also be referred to as a RAN node (or device). The network device is used to help the terminal to realize wireless access. The plurality of network devices in the communication system 1000 can be nodes of the same type or nodes of different types. In some scenarios, the roles of the network device and the terminal device are relative, for example, the network element 120i in FIG. 1 can be a helicopter or a drone, which can be configured as a mobile base station. For a terminal 120j that accesses the RAN 100 through the network element 120i, the network element 120i is a base station; but for the network device 110a, the network element 120i is a terminal. The network device and the terminal device are sometimes both referred to as a communication apparatus, for example, the network devices 110a and 110b in FIG. 1 can be understood as communication apparatuses with base station functions, and the network elements 120a-120j can be understood as communication apparatuses with terminal functions.

[0150] In a possible scenario, the network device can be a base station, an evolved NodeB (eNodeB), a transmitting and receiving point (TRP), a transmitting point (TP), a next generation NodeB (gNB), a next generation base station in a 6th generation (6G) mobile communication system, a base station in a future mobile communication system, a satellite, an integrated access and backhaul (IAB) node, a network device in a mobile communication system of a non-terrestrial network (NTN), i.e., can be deployed on a high-altitude platform or a satellite, etc. The network device can be a macro base station (such as 110a in FIG. 1), a micro base station or an indoor station (such as 110b in FIG. 1), a relay node or a donor node, or a wireless controller in a CRAN scenario. The network device can also be a device that plays a base station function in device to device (D2D) communication, vehicle-to-everything (V2X) communication, drone communication, and machine communication. Optionally, the network device can also be a server, a wearable device, a vehicle or a vehicle-mounted device, etc. For example, the network device in the V2X technology can be a road side unit (RSU).

[0151] All or part of the functions of the network device in this application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform). The network device in this application can also be a logical node, a logical module or software that can implement all or part of the functions of the network device.

[0152] In another possible scenario, a plurality of network devices cooperate to assist a terminal to implement wireless access, and different network devices respectively implement part of the functions of a base station. For example, the network device can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately arranged, or can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna processing unit (AAU) or a remote radio head (RRH). It can be understood that the network device can be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into network devices in the access network RAN, or the CU can be divided into network devices in the core network CN, which is not limited here.

[0153] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU can also be referred to as O-CU (open CU), the DU can also be referred to as O-DU, the CU-CP can also be referred to as O-CU-CP, the CU-UP can also be referred to as O-CU-UP, and the RU can also be referred to as O-RU. For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in this application. Any one of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0154] In the embodiments of this application, the form of the network device is not limited, and the device for implementing the functions of the network device can be a network device; or can be a device capable of supporting the network device to implement the functions, such as a chip system. The device can be installed in the network device or used in matching with the network device.

[0155] It should be understood that the definition of each technical term is intended to be exemplary only. For example, as the technology evolves, the meaning of a term can change in some ways, and embodiments of the present application are not limited to the definition of the term.

[0156] The random access procedure is described as follows:

[0157] Referring to FIG. 2(a), FIG. 2(a) is a flowchart of a random access procedure according to an embodiment of the present application. The four-step random access procedure based on contention shown in FIG. 2(a) is as follows. After the terminal device sends message 1 including a random access preamble, the terminal device can start a random access response window to listen to a random access response. After successfully listening to the random access response (i.e., receiving message 2 including the random access response), the terminal device can stop the random access response window, and send message 3 including scheduling information. When sending message 3, the terminal device can start a contention resolution window. If the terminal device listens to message 4 including contention resolution within the time range of the contention resolution window, the random access procedure ends.

[0158] Referring to FIG. 2(b), FIG. 2(b) is a flowchart of another random access procedure according to an embodiment of the present application. The four-step random access procedure without contention shown in FIG. 2(b) is as follows. The network device can assign a non-contention random access preamble to the terminal device. The terminal device can use the random access preamble to perform random access, that is, after the terminal device sends message 1 including the random access preamble, the terminal device can start a random access response window to listen to a random access response. After successfully listening to the random access response (i.e., receiving message 2 including the random access response), the terminal device can stop the random access response window, and the random access procedure ends.

[0159] First, in order to facilitate understanding of the embodiments of the present application, the technical problems to be solved by the embodiments of the present application are further analyzed and proposed. Currently, SIB1 is an important system information block in the 5G system, which contains important information such as cell selection, cell configuration, and scheduling and change of other system broadcast messages. The current SIB1 is periodically sent in the cell, and the period is between 20ms and 160ms. The timing of sending SIB1 can be determined by the configuration parameters in the MIB and the downlink scheduling of the network side.

[0160] Based on the energy saving requirement of the 5G network, 3GPP is specifying that the network side does not periodically send SIB1 or does not send SIB1, but sends a first system broadcast message request when the terminal device needs to obtain SIB1, for example, the terminal device sends UL-WUS to the network side, and the network side sends SIB1 after receiving the UL-WUS request of the terminal device, which is called OD-SIB1. OD-SIB1 reduces the network side SIB1 transmission to achieve the purpose of network power saving.

[0161] In the case that the SIB1 is not periodically transmitted, the terminal device in the idle / inactive mode can request the SIB1 of the cell through the request of the OD-SIB1, which can also be referred to as the NES cell.

[0162] Please refer to FIG. 2(c), which is a schematic diagram of a SIB1 updating mechanism provided by the embodiments of the present application. As shown in FIG. 2(c), the network side can send a paging of system message updating to the terminal device in the MP (modification period) of the cell, and send the updated system message in the next MP of the MP in which the paging is sent. The NES cell does not periodically transmit the SIB1, but once the SIB1 is transmitted, the NES cell can update the SIB1 according to the MP mechanism. However, as shown in FIG. 2(d), in this case, there is a possible scenario that when the SIB1 is changed, if there is no terminal device camping in the NES cell, the NES cell sends the updated SIB1, and no terminal device receives the updated SIB1 sent by the NES cell, which causes resource waste. Therefore, how to realize network energy saving is a problem to be solved.

[0163] The technical problem to be solved by the embodiments of the present application is how to realize network energy saving of SIB1 change. Based on the above, the present application provides a method for system message communication, which will be described below through each embodiment. It should be understood that these methods can be used in combination. The technical solutions provided by the present application are not limited to the processes described below. Further, the description of the scene in the embodiments of the present application is only for example, and the solutions of the embodiments of the present application are not limited to only be used in the described scene, but also applicable to scenes with similar problems.

[0164] The terminal device in the embodiments of the present application (as described in the corresponding embodiments below) can be the terminal device in the network architecture shown in FIG. 1, and the functions performed by the terminal device in the embodiments can also be performed by the device (for example, a chip, or a chip system, or a circuit) in the terminal device. The access network device in the embodiments of the present application can be the network device in the network architecture shown in FIG. 1, and the functions performed by the network device in the embodiments can also be performed by the device (for example, a chip, or a chip system, or a circuit) in the access network device. The embodiments of the present application are uniformly described here, and will not be described again in the following.

[0165] With the network architecture described above, a method for updating system information provided by the embodiments of the present application is described below. Among them, the first cell can be a NES cell (non-anchor cell with OD-SIB1, referred to as NES cell, NES cell is a cell based on request to send the first system message), the first system message request can be WUS, the first system message can be the first system information block (SIB1), and the first system message and the first system information block can be replaced. It can be understood that the first cell, the first system message request, and the first system message can also be other names, and the embodiments of the present application do not limit this.

[0166] It should be noted that the cell is described from the perspective of resource management or mobility management or service unit by the higher layer. The coverage of each network device can be divided into one or more cells, and the cell can be regarded as composed of certain frequency domain resources. The cell can be an area within the coverage of the wireless network of the network device. In the embodiments of the present application, different cells can correspond to different network devices or the same network device. In the embodiments of the present application, the cell can be replaced by the network device corresponding to the cell. For example, in the embodiments of the present application, the "neighbor cell" can be replaced by the "neighbor base station" or the "neighbor network device". For another example, the "first cell sends" or "second cell sends" mentioned in the embodiments of the present application can be replaced by "the network device of the first cell sends" or "the network device of the second cell sends". The terminal device communicates with a certain cell, which can be understood as that the terminal device communicates with the access network device to which the cell belongs or the terminal device uses the communication resource of the cell to communicate. For example, the terminal device sends a message to the first cell, which can be understood as that the terminal device sends a message to the access network device corresponding to the first cell or the terminal device sends a message using the communication resource of the first cell.

[0167] It should be noted that the MP in the embodiments of the present application can be understood as using the change period, that is, broadcasting the updated SIB1 message (except for the SIB1 message for earthquake and tsunami warning system (ETWS), commercial mobile alert service (CMAS), positioning assistance data, and certain NTN-specific information specified in the field description) in the change period after the change period in which the SIB1 change indication is sent. The change period boundary can be defined by the SFN value, where SFN mod m = 0, where m is the number of radio frames containing the change period. The change period can be configured by system information. Specifically:

[0168] modifationPeriodcoeff Actual modification period, which can be expressed in number of radio frames:

[0169] m = modifationPeriodcoeff * defaultPagingcycly, which can be found in clause 5.2.2.2. Where n2 corresponds to a value of 2, n4 corresponds to a value of 4, and so on.

[0170] BCCH-Config ::= SEQUENCE { modifationPeriodcoeff ENUMERATED { n2, n4, n8, n16}.

[0171] PagingCycle ::= ENUMERATED { rf32, rf64, rf128, rf256}.

[0172] Referring to FIG. 3, FIG. 3 is a flow interaction diagram of a method provided by the embodiments of the present application. As shown in FIG. 3:

[0173] 301. The network device sends first indication information to the terminal device.

[0174] The first indication information is used to indicate system message modification.

[0175] Optionally, the first indication information can be information indicating ETWS, or information indicating CMAS, or information indicating paging (such as the paging shown in FIG. 2(c) above).

[0176] The first indication information can be included in a paging message or a short message, in other words, the paging message or the short message can include system message modification indication or ETWS indication or CMAS indication or paging indication, which is used for the network side to page the terminal device to notify the terminal device of system message modification. Specifically:

[0177] For the case that the first indication information is included in the short message, the short message can be as follows:

[0178] The network device can use a physical cell identifier (physical radio network temporary identifier, P-RNTI) to send the short message to the terminal device on a physical downlink control channel (physical downlink control channel, PDCCH), for example, the short message field in DCI format 1_0 can be used (for details, see TS 38.212, section 7.3.1.2.1).

[0179] The short message includes short message indication information and short message information. The short message indication information can indicate that only scheduling information for paging is present in the DCI, can also indicate that only short message is present in the DCI, and can also indicate that both scheduling information for paging and short message are present in the DCI.

[0180] For example, Table 1 below defines the information of the short message.

[0181] Table 1 Information of the short message

[0182] As shown in Table 1, the first bit is the most significant bit.

[0183] The first indication information can be the first bit or the second bit, for example, the first bit set to 1 can indicate system message change, and can indicate system message change of SIB6 / 7 / 8 and positioning system message. For another example, the second bit set to 1 can indicate ETWS primary indication and / or ETWS secondary indication and / or CMAS indication, and can also indicate system message change, for example, SIB1 change. It can be understood that if the first indication information is the first bit or the second bit, the fifth to eighth bits can be reserved bits.

[0184] Alternatively, the first indication information can be one of the fifth to eighth bits, for example, the fifth bit. For example, the fifth bit set to 1 can indicate system message change, for example, SIB1 change. It can be understood that if the first indication information is one of the fifth to eighth bits, the other bits of the fifth to eighth bits except the bit where the first indication information is located can be reserved bits.

[0185] In the case of using one of the fifth to eighth bits (for example, the fifth bit) to represent the first indication information:

[0186] In one possible implementation, for the fifth bit set to 1 and the first bit set to 0, the fifth bit can be explained as follows: the fifth bit set to 1 can indicate system message change, for example, SIB1 change, and the first bit set to 0 can indicate that the system message does not change.

[0187] Another possible implementation, for the 5th bit is set to 1, the 1st bit is set to 1, then the 5th bit indicates SIB1 change, and the 1st bit also indicates SIB1 change, either of the two bits can be used to determine the indication of SIB1 change, and the 1st bit can be further explained: the 1st bit is set to 1, indicating that in addition to the system message change of SIB6 / 7 / 8 and the positioning system message, the system message change for the terminal device of the NES cell does not include the change of SIB1. In this implementation, the 5th bit can be set to 1 to indicate the system message change, such as SIB1 change, without considering the repeated indication of the 1st bit set to 1.

[0188] For the case that the first indication information is included in the paging message, the paging message can further include the identity of the terminal device and the access type (such as 3GPP access and non-3GPP access).

[0189] The system message can be a system message other than SIB6 / 7 / 8, such as SIB1 / SIB2 / SIB3 / SIB4 / SIB5 / SIB9, etc.; or the system message can be SIB1. The first indication information can indicate the system message change by indicating the BCCH change. In the embodiments of the present application, the system message change can also be referred to as system message update, that is, the system message change and the system message update can be equivalent.

[0190] In a possible implementation, the network device can send the first indication information in the first MP.

[0191] It should be noted that the network device can be a network device corresponding to the first cell, and the network device and the first cell can be equivalent.

[0192] 302、In the case that the terminal device receives the first indication information, the terminal device sends a first system message request to request the first system message.

[0193] In the case that the terminal device receives the first indication information from the network device, the terminal device can send a first system message request to the network device to request the first system message. That is, the terminal device can send the first system message request to request the network side to update the first system message, and the network device updating the first system message can be understood as the network device sending the updated first system message to the terminal device.

[0194] Optionally, after receiving the first indication information, the terminal device can determine whether to save the valid first system message, and if the terminal device saves the valid first system message, the terminal device can not need to send the first system message request; if the terminal device does not save the valid first system message, the terminal device sends the first system message request.

[0195] Further optionally, after receiving the first indication information, the terminal device can also detect the first system message, if the terminal device detects the first system message, the terminal device can not need to send the first system message request; if the terminal device does not detect the first system message, the terminal device sends the first system message request. The detection of the first system message can be referred to as receiving the first system message, or receiving and decoding the first system message, or determining to save the valid first system message. The detection of the first system message by the terminal device includes detecting the updated first system message, and the valid first system message can be understood as the updated first system message.

[0196] The terminal device can detect the first system message in the following manner:

[0197] The terminal device can detect the first system message according to the related information of the first system message. If the stored related information of the first system message is the same as the detected related information of the first system message, it can be determined that the first system message has not been detected; if the stored related information of the first system message is different from the detected related information of the first system message, it can be determined that the first system message has been detected, and in this case, the terminal device can save the first system message with the latest related information. The related information of the first system message can include the version number of the first system message and the content information included in the first system message, and the content information included in the first system message can include, for example, cell reselection information, cell selection information, information of a neighboring cell, access control information, etc.

[0198] Optionally, the detection of the first system message by the terminal device can be understood as follows: as long as the terminal device receives the first system message after receiving the first indication information, the terminal device considers the first system message as the updated first system message, so the terminal device only needs to determine whether the first system message is received, and does not need to send the first system message request. If the terminal device does not detect the first system message, the terminal device needs to send the first system message request.

[0199] Optionally, the terminal device detecting the first system message can be understood as that the terminal device detects the first system message within a preset time after receiving the first indication information. The preset time can be the time from receiving the first indication information to sending the first system message request, and the time of sending the first system message request is the time of the resource for sending the first system message request. The resource can be a random access resource or an uplink grant resource or an uplink resource, and the time or time can be a system frame number or a subframe or a time slot or a symbol of the resource. The time can be the start time or the end time of the resource. For example, the start time is the first symbol of the resource, and the end time is the last symbol of the resource. The preset time can also be a predefined or preconfigured time length. For example, a timer is defined, the timer is started when the first indication information is received, and the first system message is detected within the running time of the timer. If the first system message is detected before the timer expires, the first system message request will not be sent. If the first system message is not detected before the timer expires, the first system message request can be sent. It can be understood that the preset time can also include the first time described below, that is, before the terminal device sends the first system message request, it can be detected whether there is an updated first system message. In one possible implementation, the preset time can be before the end of the next MP of the MP in which the terminal device receives the first indication information, that is, the preset time can be the current MP in which the terminal device receives the first indication information, or the preset time can be before the next MP of the current MP.

[0200] The terminal device can send the first system message request in any one or more of the following ways:

[0201] In a first possible implementation, when the terminal device receives the first indication information, the terminal device sends the first system message request to request the first system message. In other words, the terminal device receives the first indication information, and immediately sends the first system message request to request the first system message. Optionally, the terminal device can send the first system message request one or more times. For example, the terminal device needs to send the first system message request N times. When the number of times of sending is greater than N, the terminal device will not send the first system message request any more, where N is an integer greater than or equal to 1.

[0202] In a second possible implementation, the terminal device sends the first system message request on the resource on which the terminal device can send the first system message request for the first time after receiving the first indication information. The resource on which the terminal device can send the first system message request for the first time can refer to the interval between the time of the resource and the time of receiving the first indication information. The time of the resource can be the start time or the end time. For example, there are three resources for sending the first system message request, the start time of resource 1 is T a , the start time of resource 2 is T b, the start time of resource 3 is T c , the time of receiving the first indication information is T d , T a , T b , T c , and the time interval of T d is 1ms, 1.2ms and 1.4ms respectively, the terminal device can select resource 1 to send the first system message request.

[0203] In the third possible implementation, the network device can send the first indication information in the first MP, and the terminal device can send the first system message request in the first MP after receiving the first indication information, or can send the first system message request in the resource closest to the terminal device in the first MP after receiving the first indication information. If the resource in which the terminal device can send the first system message request is after the end time of the first MP, the terminal device will not send the first system message request. This case can make the network side receive the first system message request in the first MP, and send the first system message to the terminal device as soon as possible in the next MP of the first MP.

[0204] In the fourth possible implementation, the network device can send the first indication information in the first MP, and the terminal device can send the first system message request in the next MP of the first MP after receiving the first indication information.

[0205] In the fifth possible implementation, the network device can send the first indication information in the first MP, and the terminal device can send the first system message request before T1 of the next MP of the first MP after receiving the first indication information.

[0206] In the sixth possible implementation, the terminal device can send the first system message request in the preset time length after receiving the first indication information, or in the preset time length after the start time of the next MP of the first MP, for example, the start time of the next MP is Ts, and the terminal device can send the first system message request in the time interval of [Ts, Ts+pre-set time length].

[0207] In a seventh possible implementation, the terminal device can send the first system message request through a random access resource, which can be a contention random access resource or a non-contention random access resource or a dedicated random access resource. The contention random access resource can be used to send the first system message request through a contention random access procedure, i.e., the first system message request can be sent in a random access message 3 (as shown in message 3 in FIG. 2(a) above). The non-contention random access resource or the dedicated random access resource is a dedicated resource allocated for sending the first system message request, i.e., the random access preamble and the first system message request correspond to each other, and the terminal device sends the random access preamble to indicate the first system message request.

[0208] Optionally, in an eighth possible implementation, for the case where the network device corresponds to multiple terminal devices, if the first terminal device has sent the first system message request, the network device receives the first system message request sent by the first terminal device, and broadcasts the updated first system message to the multiple terminal devices. For the second terminal device, the updated first system message can be detected before sending the first system message request. If the updated first system message is detected, the first system message request can not be sent, thereby saving signaling overhead.

[0209] 303. The network device receives the first system message request, and sends the updated first system message.

[0210] Optionally, if the network device does not receive the first system message request, the updated first system message will not be sent. Further, in the process of sending the first indication information (e.g., the first indication information is included in a paging message) to the terminal device, if the network device does not receive the first system message request from the terminal device, the network device will not maintain the paging message any more, and will not send the paging message at the configured paging occasion any more until the network device receives the first system message request sent by the terminal device.

[0211] The implementation of the network device sending the updated first system message can be any one or more of the following:

[0212] In a first possible implementation, the network device can send the first indication information at the first MP, and send the updated first system message at the next MP of the first MP.

[0213] In a second possible implementation, the network device can send the first indication information at the first MP, receive the first system message request from the terminal device at the first MP, and send the updated first system message at the T2 time of the next MP of the first MP.

[0214] In a third possible implementation, the network device can send the first indication information at the first MP, receive the first system message request of the terminal device at the next MP of the first MP, and send the updated first system message in the next MP of the first MP.

[0215] In a fourth possible implementation, the network device sends the updated first system message within a preset time after receiving the first system message request. For example, the time of receiving the first system message request is Te, in this case, the start time of the preset time is the end time of Te, for example, the network device sends the updated first system message within a time period of [Te, Te+ preset time].

[0216] In a fifth possible implementation, if the terminal device sends the first system message request through a random access resource, after the terminal device sends a random access preamble, the random access preamble is used to indicate the first system message request, the network device does not send a random access response (RAR), and directly sends the first system message. The terminal device does not expect to receive the RAR after sending the first system message request or indicating the first system message request through the preamble, and therefore, the terminal device can send the first system message request one or more times, that is, send the random access preamble one or more times. For example, the terminal device sends the first system message request N times, and when the number of sending the first system message request reaches N times, the current random access process can be ended.

[0217] In a sixth possible implementation, if the terminal device sends the first system message request through a random access resource, the terminal device sends the first system message request through a message 3 in the random access, and the network device directly sends the first system message. The terminal device does not expect to receive a response (message 4) after indicating the first system message request through the message 3, and therefore, the terminal device can send the first system message request one or more times, that is, send the message 3 one or more times. For example, the terminal device sends the first system message request N times, and when the number of sending the first information reaches N times, the current random access process is ended.

[0218] Seventh possible implementation, if the terminal device sends the first system message request through the random access resource, the terminal device sends the random access preamble, the random access preamble is used to indicate the first system message request, the network device sends the RAR, the RAR is used to indicate the random access success. The terminal device receives the first system message in the case of receiving the RAR. Optionally, the terminal device judges whether the RAR is received within a period of time, the period of time is the RAR receiving window. The terminal device sends the first system message request once or multiple times, that is, sends the random access preamble once or multiple times. For example, the terminal device sends the first system message request indication N times, when the sending number of the first system message request reaches N times, the RAR receiving window starts after sending the first system message request N times, and the current random access process ends.

[0219] Eighth possible implementation, if the terminal device sends the first system message request through the random access resource, the terminal device sends the first system message request through the message 3 in the random access, the network device sends the message 4 in the random access, and the terminal device receives the first system message in the case of receiving the message 4. Optionally, the terminal device judges whether the RAR is received within a period of time 1 (for example, the random access response window), and judges whether the message 4 is received within a period of time 2 (for example, the contention resolution window). The terminal device sends the first system message request once or multiple times, that is, sends the message 3 once or multiple times. For example, the terminal device sends the first system message request N times, when the sending number of the first system message request reaches N times, the current random access process ends.

[0220] In the embodiment of the application, the network side can issue indication information (for example, first indication information) of system message update to the terminal device. Unlike the prior art, the network side continues to issue the updated first system message after issuing the indication information, in the embodiment of the application, the network device sends the updated first system message again after receiving the first system message request of the terminal device after issuing the indication information. That is, when the first system message changes, the terminal device needs to actively request the first system message, thereby avoiding the waste of resources caused by the network side sending the updated first system message without the terminal device receiving, and thus the network energy saving of the first system message change can be realized.

[0221] In combination with the method flowchart shown in FIG. 3, the following will specifically illustrate several possible embodiments:

[0222] Embodiment one, please refer to FIG. 4, which is a scene diagram of first system message update provided by the embodiment of the application. As shown in FIG. 4:

[0223] 1. The network device corresponding to the first cell indicates the terminal device first system message change through the first indication information in MP#1.

[0224] 2. After receiving the first indication information, the terminal device sends a first system message request in MP#2 to request the network device to send the first system message of the first cell. For example, the terminal device can send an OD-SIB1 through a WUS configuration to request the first system message. Alternatively, after receiving the first indication information, the terminal device can send the first system message request at the nearest physical random access channel (PRACH) occasion.

[0225] 3. After receiving the first system message request, the network device corresponding to the first cell sends the updated first system message to the terminal device in MP#2.

[0226] Embodiment two, please refer to FIG. 5, which is another scenario of first system message update provided by the embodiments of the present application. The network device corresponding to the first cell corresponds to a plurality of terminal devices, and the network device sends first indication information to one or more terminal devices to indicate the first system message change. Then, the one or more terminal devices can first detect whether there is an updated first system message after receiving the first indication information. If no updated first system message is detected, the terminal device can send a first system message request to the network device. After receiving the first system message request sent by the terminal device, the network device can broadcast the updated first system message. For other terminal devices that have not sent the first system message request, since the network device has issued the updated first system message, the terminal device can detect the updated first system message before sending the first system message request, so the terminal device can not need to send the first system message request to the network device, thereby saving signaling overhead.

[0227] The one or more terminal devices can first detect whether there is an updated first system message after receiving the first indication information. If no updated first system message is detected, the terminal device can send a first system message request to the network device. The occasion of sending the first system message request to the network device can be to send the first system message request on the nearest resource capable of sending the first system message request after receiving the first indication information. The nearest resource capable of sending the first system message request can mean that the interval between the time of the resource and the time of receiving the first indication information is the shortest. The time of the resource can be the start time or the end time. For example, for terminal device #1, there are three resources to send the first system message request, the start time of resource 1 is T a , the start time of resource 2 is T b , and the start time of resource 3 is T c, the time of receiving the first indication information is T d , the time interval between T a , T b , T c and T d is 1ms, 1.2ms and 1.4ms respectively, then the terminal device #1 can select resource 1 to send the first system message request.

[0228] As shown in Figure 5:

[0229] 1, the network device corresponding to the first cell corresponds to a plurality of terminal devices, such as terminal device #1 and terminal device #2. The network device can indicate the first system message change to the terminal device #1 through the first indication information in the MP#1, and the network device can also indicate the first system message change to the terminal device #2 through the first indication information in the MP#1.

[0230] 2, after the terminal device #1 and the terminal device #2 receive the first indication information, it can be detected whether there is an updated first system message, if no updated first system message is detected, the first system message request can be sent on the resource closest to the first system message request.

[0231] For example, as shown in (a) of FIG. 5, terminal device #1 can send a first system message request to the network device within MP#1 to request the network device to send the first system message of the first cell, and terminal device #2 can send a first system message request to the network device within MP#2, thus it can be seen that terminal device #1 sends the first system message request to the network device first, because terminal device #1 has sent the first system message request, thus receives the network broadcast updated first system message before terminal device #2 sends the first system message request, thus terminal device #2 can detect the updated first system message before sending the first system message request, thus terminal device #2 does not need to send the first system message. For another example, as shown in (b) of FIG. 5, terminal device #1 can send a first system message request to the network device within MP#2 to request the network device to send the first system message of the first cell, and terminal device #2 can send a first system message request to the network device within MP#2, thus it can be seen that terminal device #1 sends the first system message request to the network device first, because terminal device #1 has sent the first system message request, thus receives the network broadcast updated first system message before terminal device #2 sends the first system message request, thus terminal device #2 can detect the updated first system message before sending the first system message request, thus terminal device #2 does not need to send the first system message. Alternatively, for another example, as shown in (c) of FIG. 5, terminal device #1 can send a first system message request to the network device within MP#2 to request the network device to send the first system message of the first cell, and terminal device #2 can send a first system message request to the network device within MP#2, but because the resource that terminal device #2 sends the first system message request is in front of the resource that terminal device #2 sends the first system message request, thus it can be seen that terminal device #2 sends the first system message request to the network device first, because terminal device #2 has sent the first system message request, thus receives the network broadcast updated first system message before terminal device #1 sends the first system message request, thus terminal device #1 can detect the updated first system message before sending the first system message request, thus terminal device #1 does not need to send the first system message.

[0232] Through (a) of FIG. 5 to (c) of FIG. 5, it can be seen that which of terminal device #1 and terminal device #2 sends the first system message request first is related to the resource that the terminal device can send the first system message request closest after receiving the first indication information.

[0233] 3. Corresponding to (a) of Figure 5 and (b) of Figure 5, the network device corresponding to the first cell receives the first system message request from the terminal device #1, and broadcasts the updated first system message to the plurality of terminal devices within the MP#2. As for the terminal device #2, since the network device has issued the updated first system message, the terminal device #2 can detect the updated first system message before sending the first system message request, and thus can not need to send the first system message request to the network device. Alternatively, corresponding to (c) of Figure 5, the network device corresponding to the first cell receives the first system message request from the terminal device #2, and broadcasts the updated first system message to the plurality of terminal devices within the MP#2. As for the terminal device #1, since the network device has issued the updated first system message, the terminal device #1 can detect the updated first system message before sending the first system message request, and thus can not need to send the first system message request to the network device.

[0234] Embodiment three, please refer to Figure 6, which is another kind of first system message update scenario provided by the embodiments of the present application. As shown in Figure 6:

[0235] 1. The network device corresponding to the first cell indicates the first system message change of the terminal device within the MP#1 through the first indication information.

[0236] 2. The terminal device receives the first indication information, and sends the first system message request to request the network device to send the first system message of the first cell within the T1 time of the MP#2.

[0237] 3. The network device corresponding to the first cell receives the first system message request, and sends the updated first system message to the terminal device within the T2 time of the MP#2.

[0238] Embodiment four, please refer to Figure 7, which is another kind of first system message update scenario provided by the embodiments of the present application. As shown in Figure 7:

[0239] 1. The network device corresponding to the first cell issues the first indication information to indicate the first system message change of the plurality of terminal devices, such as the terminal device #1 and the terminal device #2, within the MP#1.

[0240] 2. The terminal device #1 receives the first indication information, and sends the first system message request to request the network device to send the first system message of the first cell within the T1 time of the MP#2. Alternatively, the terminal device #2 also can send the first system message request to request the network device to send the first system message of the first cell within the T1 time of the MP#2 after receiving the first indication information.

[0241] 3. The network device corresponding to the first cell receives the first system message request from the terminal device #1 and broadcasts the updated first system message within T2 of MP#2. The terminal device #1 can detect the updated first system message, i.e., receive the updated first system message from the network device. Optionally, the terminal device #2 can also detect the updated first system message, i.e., receive the updated first system message from the network device. Since the network device broadcasts the updated first system message, the terminal device #2 can also detect the updated first system message, and thus the terminal device #2 can also not need to send the first system message request to the network device.

[0242] Embodiment Five, please refer to FIG. 8, which is another scenario of updating the first system message provided by the embodiments of the present application. As shown in FIG. 8:

[0243] 1. The network device corresponding to the first cell indicates the first system message change of the terminal device by the first indication information within MP#0.

[0244] 2. The terminal device receives the first indication information and sends the first system message request to request the network device to send the first system message of the first cell within MP#1.

[0245] 3. The network device corresponding to the first cell receives the first system message request and sends the updated first system message to the terminal device within MP#2.

[0246] Embodiment Six, please refer to FIG. 9, which is a scenario of not updating the first system message provided by the embodiments of the present application. As shown in FIG. 9:

[0247] 1. The network device corresponding to the first cell indicates the first system message change of the terminal device by the first indication information within MP#0.

[0248] 2. If the network device does not receive the first system message request from the terminal device, the updated first system message will not be sent within MP#1.

[0249] Please refer to FIGS. 10-13, which are flowcharts of updating the first system message provided by the embodiments of the present application. The terminal device can send the first system message request through the random access resource, which can be the non-contention random access resource or the contention random access resource.

[0250] Embodiment Seven, as shown in FIG. 10, the terminal device can send the first system message request through the non-contention random access resource. Specifically:

[0251] 1. The network device can send the first indication information to the terminal device to change the first system message.

[0252] 2、terminal device receives the first indication information, triggers the sending of the first system message request. Specifically, the terminal device can send a random access preamble to the network device, and the random access preamble is used to indicate the first system message request.

[0253] 3、the network device sends a RAR to the terminal device, and the terminal device ends the random access process after receiving the RAR.

[0254] 4、the network device can broadcast the updated first system message, and the terminal device detects the updated first system message, i.e. can receive the updated first system message from the network device.

[0255] Embodiment eight, as shown in FIG. 11, the terminal device can send the first system message request through the contention random access resource. Specifically:

[0256] 1、the network device can send the first indication information to the terminal device to change the first system message.

[0257] 2、terminal device receives the first indication information, triggers the sending of the first system message request. Specifically, the terminal device can send a random access preamble to the network device, and the random access preamble is used for random access, which can also be understood as for uplink synchronization.

[0258] 3、the network device sends a RAR to the terminal device.

[0259] 4、the terminal device sends the first system message request to the network device through the message 3 in the random access.

[0260] 5、the network device sends a contention resolution message to the terminal device, and the terminal device ends the random access process after receiving the contention resolution message.

[0261] 6、the network device can broadcast the updated first system message, and the terminal device detects the updated first system message, i.e. can receive the updated first system message from the network device.

[0262] Embodiment nine, as shown in FIG. 12, the terminal device can send the first system message request through the non-contention random access resource. Specifically:

[0263] 1、the network device can send the first indication information to the terminal device to change the first system message.

[0264] 2、terminal device receives the first indication information, triggers the sending of the first system message request. Specifically, the terminal device can send a random access preamble to the network device, and the random access preamble is used to indicate the first system message request.

[0265] 3. The terminal device detects the updated first system message. The network device broadcasts the updated first system message, and in the case that the terminal device receives the updated first system message, the random access procedure ends. Alternatively, the terminal device can send one or more first system message requests through the random access preamble, and when a certain number of first system message requests are sent, the random access procedure ends.

[0266] It should be noted that, compared with FIG. 10, the network device does not need to send RAR, and can directly broadcast the updated first system message. After the terminal device sends the first system message request through the random access preamble, it does not expect to receive RAR, and after sending the random access preamble, it can start detecting the updated first system message. Secondly, the end of the random access procedure in FIG. 10 and FIG. 12 is also different. In FIG. 10, the terminal device indicates that the random access procedure ends in the case that it receives RAR, while in FIG. 12, the terminal device indicates that the random access procedure ends in the case that it receives the updated first system message, or after it sends the first system message request through the random access preamble.

[0267] Embodiment Ten, as shown in FIG. 13, the terminal device can send the first system message request through a contention random access resource. Specifically:

[0268] 1. The network device can send first indication information to the terminal device to change the first system message.

[0269] 2. After the terminal device receives the first indication information, it triggers the sending of the first system message request. Specifically, the terminal device can send a random access preamble to the network device, and the random access preamble can be used for random access, and can also be understood as being used for uplink synchronization.

[0270] 3. The network device sends RAR to the terminal device.

[0271] 4. The terminal device sends the first system message request to the network device through message 3 in the random access. After the terminal device sends message 3, it can detect the updated first system message.

[0272] 5. The network device can broadcast the updated first system message. The terminal device ends the random access procedure in the case that it receives the updated first system message. Alternatively, the terminal device can send one or more first system message requests through message 3, and when a certain number of first system message requests are sent, the random access procedure ends.

[0273] It should be noted that, compared with FIG. 11, the network device does not need to send a contention resolution message, and can directly broadcast the updated first system message. After the terminal device sends the first system message request through the message 3, the terminal device does not expect to receive the contention resolution message, and after the message 3 is sent, the terminal device can start detecting the updated first system message. Secondly, the ending of the random access procedure represented in FIG. 11 and FIG. 13 is also different. In FIG. 11, the terminal device represents the ending of the random access procedure in the case where the contention resolution message is received, while in FIG. 13, the terminal device represents the ending of the random access procedure in the case where the updated first system message is received, or after the terminal device sends the first system message request through the message 3.

[0274] Referring to FIG. 14, FIG. 14 is a flow interaction diagram of another method provided by the embodiment of the present application. As shown in FIG. 14:

[0275] 1401. The terminal device sends first information to the network device, and the first information is used to request to determine whether the first system message is valid.

[0276] In a possible implementation, the terminal device sends the first information once or multiple times.

[0277] The implementation of the terminal device sending the first information can be any one or more of the following:

[0278] In a first possible implementation, the terminal device can periodically send the first information, that is, after receiving the first system message, the terminal device starts to periodically send the first information, that is, sends the first information according to a first period. The time of sending the first information can be determined by the first period and the next system frame number (first system frame number) of the system frame number of receiving the first system message. Starting from the first system frame number, the first information is sent according to the first period, for example, starting from the first subframe of the first system frame number, the first information is sent for a time corresponding to the first period, for example, the first subframe of the first system frame number is 50, the first period is 80 ms, and the subframe number of sending the first information can be 130, 210, 290, and the like, which can also include the subframe number 50.

[0279] In a second possible implementation, the terminal device can periodically send the first information within a first time length, that is, the terminal device can determine the first time length according to the first period, and send the first information once or multiple times within each first time length. For example, one period is an MP of one cell, and the first time length is less than the MP of one cell. For another example, starting from the first subframe 50, the first period is 80 ms, and the first information can be sent within the first time length between the subframe 50 and the subframe 130, and the first information can be sent within the first time length between the subframe 130 and the subframe 210.

[0280] The third possible implementation is that the terminal device sends the first information through a random access resource, which is a contention random access resource or a non-contention random access resource. When it is the non-contention random access resource, the first information can be sent through the correspondence between the random access preamble and the first information, i.e., a first preamble is used to send the first information, and the terminal device sends the first preamble to indicate the first information.

[0281] The fourth possible implementation is that the terminal device sends the first information through an uplink grant, i.e., the uplink grant is configured according to the first period, i.e., the first subframe of the first system frame number is 50, the first period is 80 ms, and the subframe number for sending the first information can be 130, 210, 290, and the like, which can also include the subframe number 50. Therefore, there is an uplink grant at the time of the subframe number 50, 130, 210, and 290 to enable the terminal device to send the first information.

[0282] It should be noted that at least one of the random access resource, the uplink grant, and the first period described above can be configured by the network device.

[0283] 1402、After the network device receives the first information, it determines whether the first system message is valid. If not, the network device broadcasts the first system message and / or sends the second information to the terminal device; if yes, the network device does not broadcast the first system message and / or send the second information to the terminal device.

[0284] After the network device receives the first information, it can determine whether the first system message is valid (i.e., whether a change occurs), and if a change occurs, it determines that the first system message is invalid, and can broadcast the first system message and / or send the second information to the terminal device; if no change occurs, it determines that the first system message is valid, and can not broadcast the first system message and / or send the second information to the terminal device. The second information is used to indicate whether the first system message is valid.

[0285] Further optionally, the terminal device can wait to receive the first system message and / or the second information from the network device within a preset time, and if the first system message and / or the second information is received within the preset time, it confirms that the first system message is changed, and if the first system message and / or the second information is not received within the preset time, it confirms that the first system message is valid, and can continue to use the first system message.

[0286] Optionally, the network device can broadcast a confirmation message to the terminal device if it determines that the first system message is valid, and the confirmation message is used to confirm that the first system message is valid.

[0287] The implementation of the network device broadcasting the first system message and / or sending the second information to the terminal device can be any one or more of the following:

[0288] In a first possible implementation, if the terminal device transmits the first information through the random access resource, the terminal device transmits a random access preamble, the random access preamble is used to indicate the first information, the network device does not transmit the RAR, and directly broadcasts the first system message and / or transmits the second information. After the terminal device transmits the first information or indicates the first information through the random access preamble, the terminal device does not expect to receive the RAR. Therefore, the terminal device can transmit the first information once or multiple times, that is, the terminal device transmits the random access preamble once or multiple times. For example, the terminal device transmits the first information N times. When the number of times of transmitting the first information reaches N times, the current random access process ends.

[0289] In a second possible implementation, if the terminal device transmits the first information through the random access resource, the terminal device transmits message 3 in the random access, message 3 is used to indicate the first information, the network device does not transmit the contention resolution message, and the network device directly broadcasts the first system message and / or transmits the second information after receiving message 3. After the terminal device indicates the first information through the random access message 3, the terminal device does not expect to receive the RAR. Therefore, the terminal device can transmit the first information once or multiple times, that is, the terminal device transmits message 3 once or multiple times. For example, the terminal device transmits the first information N times. When the number of times of transmitting the first information reaches N times, the current random access process ends.

[0290] In a third possible implementation, if the terminal device transmits the first information through the random access resource, the terminal device transmits a random access preamble, the random access preamble is used to indicate the first information, and the network device transmits the RAR, the RAR carries the first system message and / or the second information. In one implementation, the RAR carries the second information, the second information is used to indicate whether the first system message is valid. When the first system message is invalid, the terminal device further receives the first system message. Optionally, the terminal device can determine whether the second information is received within a period of time. The terminal device transmits the first information once or multiple times, that is, the terminal device transmits the random access preamble once or multiple times. For example, the terminal device transmits the first information N times. When the number of times of transmitting the first information reaches N times, the current random access process ends.

[0291] The fourth possible implementation manner is that the terminal device sends the first information through the random access resource, the terminal device sends a message 3 in the random access, the message 3 is used for indicating the first information, and the network device sends a RAR. For example, the terminal device sends the message 3 in the random access, the message 3 can carry the first information, the network device sends a message 4 in the random access, the message 4 can carry the second information, the second information is used for indicating whether the first system message is valid, and the terminal device further receives the first system message in the case that the first system message is invalid. Optionally, the terminal device can determine whether the second information is received within a period of time. The terminal device sends the first information once or multiple times, that is, the terminal device sends the message 3 once or multiple times, for example, the terminal device sends the first information N times, and the current random access process is ended after the number of times of sending the first information reaches N times.

[0292] The fifth possible implementation manner is that the terminal device sends the first information through the random access resource, the terminal device sends a random access preamble, the first system message is changed, the network device sends a RAR, the RAR carries the second information, the second information indicates that the first system message is invalid, the terminal device further receives the first system message, and the first system message is an updated system message. If the first system message is not changed, the second information is not sent, and the terminal device considers that the first system message is valid in the case that the terminal device does not receive the second information within a period of time. The terminal device sends the first information once or multiple times, that is, the terminal device sends the random access preamble once or multiple times, for example, the terminal device sends the first information N times, and the current random access process is ended after the number of times of sending the first information reaches N times.

[0293] The sixth possible implementation manner is that the terminal device sends the first information through the random access resource, the terminal device sends a message 3 in the random access, the message 3 is used for indicating the first information, and the network device sends a RAR. For example, the terminal device sends the message 3 in the random access, the message 3 can carry the first information, the first system message is changed, the network device sends a message 4 in the random access, the message 4 can carry the second information, the second information indicates that the first system message is invalid, the terminal device further receives the first system message, and the first system message is an updated system message. If the first system message is not changed, the second information is not sent, and the terminal device considers that the first system message is valid in the case that the terminal device does not receive the second information within a period of time. The terminal device sends the first information once or multiple times, that is, the terminal device sends the message 3 once or multiple times, for example, the terminal device sends the first information N times, and the current random access process is ended after the number of times of sending the first information reaches N times.

[0294] The difference between the flow chart of the embodiment of FIG. 3 and FIG. 14 is that, for FIG. 3, the network device actively pages the terminal device due to the system message change; and for FIG. 14, the network device does not change the first system message by the first indication information, but the terminal device actively confirms with the network device whether the first system message is valid.

[0295] In the embodiment, the terminal device can actively send the network device the first information to request whether the first system message is valid, the network device determines whether the first system message is valid, and in the case that the first system message is invalid, the network device sends the terminal device the updated first system message, so that the resource waste caused by the network side sending the updated first system message without the terminal device receiving can be avoided, and thus the network energy saving of the first system message change can be realized.

[0296] In combination with the method flow chart shown in FIG. 14, the following specifically illustrates several possible embodiments:

[0297] Embodiment Eleven, please refer to FIG. 15(a), which is another scene diagram of the first system message update provided by the embodiment. As shown in FIG. 15(a):

[0298] 1. The terminal device can periodically send the network device the first information to request to determine whether the first system message is valid, for example, the first information can be sent according to a first period. For example, the first period can be one MP, and the terminal device periodically sends the first information in each MP, and in FIG. 15, only the terminal device sending the first information in MP#1 and MP#2 is shown.

[0299] 2. After the terminal device receives the first information in MP#1, if the network device determines that the first system message is invalid, the network device can send the terminal device the updated first system message in MP#2.

[0300] 3. The terminal device continues to periodically send the network device the first information.

[0301] Embodiment Twelve, please refer to FIG. 15(b)-FIG. 15(d), which are another scene diagram of the first system message update provided by the embodiment.

[0302] As shown in FIG. 15(b):

[0303] 1. The terminal device can periodically send the first information to the network device to request to determine whether the first system message is valid, for example, the first information can be sent according to the first period. The time of sending the first information can be determined by the first period and the next system frame number of the system frame number of receiving the first system message (the first system frame number), starting from the first system frame number, sent according to the first period, for example, starting from the first subframe of the first system frame number, sent for the time corresponding to the first period, the first subframe of the first system frame number is 50, the first period is 80ms, then the subframe number of sending the first information can be 130, 210, 290…, which can also include the subframe number 50.

[0304] 2. After receiving the first information, if the network device determines that the first system message is invalid, the terminal device can send the updated first system message to the terminal device.

[0305] 3. The terminal device continues to periodically send the first information to the network device.

[0306] As shown in FIG. 15(c):

[0307] 1. The terminal device can periodically send the first information to the network device to request to determine whether the first system message is valid, for example, the first information can be sent according to the first period, and a time period is determined according to the first period, and the first information is sent one or more times in each time period. For example, starting from the first subframe 50, the first period is 80ms, then one or more times of the first information can be sent in a time period T1 between subframe 50 and subframe 130, and one or more times of the first information can be sent in a time period T1 between subframe 130 and subframe 210. The purpose of sending multiple times is that the terminal device may not be successful in sending the first information once, and sending multiple times can improve the reliability of sending the first information to the network device.

[0308] 2. After receiving the first information, if the network device determines that the first system message is invalid, the terminal device can send the updated first system message to the terminal device.

[0309] 3. The terminal device continues to periodically send the first information to the network device.

[0310] As shown in FIG. 15(d):

[0311] 1. Terminal devices can periodically send first information to network devices to request confirmation of the validity of a first system message. For example, they can send first information according to a first period, specifically a duration determined by the first period, sending one or more first information messages within each duration. For instance, starting with subframe 50 and the first period being 80ms, one or more first information messages can be sent within a duration T1 between subframe 50 and subframe 130, and one or more first information messages can be sent within a duration T1 between subframe 130 and subframe 210. The purpose of sending multiple messages is to improve the reliability of the first information being sent to the network device, as the terminal device may fail to send the first information once.

[0312] 2. Optionally, after receiving the first information, if the network device determines that the first system message is valid, the terminal device may send an acknowledgment message to the terminal device, which is used to indicate that the first system message is valid.

[0313] 3. The terminal device continues to periodically send the first information to the network device.

[0314] Please refer to Figures 16-19, which are schematic flowcharts illustrating another first system message update provided in an embodiment of this application. The terminal device can send the first information through random access resources, which can be non-contentionable random access resources or contentionable random access resources.

[0315] Example 13: As shown in Figure 16, the terminal device can send the first information through non-contention-based random access resources. Specifically:

[0316] 1. The terminal device may send first information to the network device to request confirmation of the validity of the first system message. For example, the terminal device may send a random access preamble to the network device, which is used to indicate the first information.

[0317] 2. The network device sends a RAR to the terminal device. Further, after receiving the first information, the network device checks if the first system message has been changed. If the first system message has been changed, it can include information confirming the invalidity of the first system message in the RAR. Upon receiving the RAR, the terminal device terminates the random access procedure.

[0318] 3. Network devices can broadcast updated first system messages, and terminal devices can detect updated first system messages, that is, they can receive updated first system messages from network devices.

[0319] Example 14: As shown in Figure 17, the terminal device can send the first information by competing for random access resources. Specifically:

[0320] 1、Terminal device can send random access preamble to network device, the random access preamble is used for random access, also can be understood as used for uplink synchronization.

[0321] 2、Network device sends RAR to terminal device.

[0322] 3、Terminal device sends first information to network device through message 3 in random access.

[0323] 4、Network device sends contention resolution message to terminal device. Further, after receiving the first information, the network device confirms whether the first system message has changed, if the first system message has changed, the network device can carry information in the contention resolution message to determine that the first system message is invalid. The terminal device ends the random access process when receiving the contention resolution message.

[0324] 5、Network device can broadcast updated first system message, and terminal device detects the updated first system message, that is, can receive the updated first system message from the network device.

[0325] Embodiment fifteen, as shown in FIG. 18, the terminal device can send the first information through the non-contention random access resource. Specifically:

[0326] 1、Terminal device can send first information to network device to request to determine whether the first system message is valid. Exemplarily, the terminal device can send random access preamble to the network device, the random access preamble is used to indicate the first information.

[0327] 2、Terminal device detects the updated first system message. After receiving the first information, the network device confirms whether the first system message has changed, if the first system message has changed, the network device can broadcast the updated first system message, and the terminal device ends the random access process when receiving the updated first system message. Alternatively, the terminal device can send the first information once or multiple times through the random access preamble, and can end the random access process after sending the first information for a certain number of times.

[0328] It should be noted that, compared with FIG. 16, the network device does not need to send the RAR, and can directly broadcast the updated first system message in the case that it is determined that the first system message is changed. The terminal device does not expect to receive the RAR after sending the first information through the random access preamble, and can start detecting the updated first system message after sending the random access preamble. Secondly, the ending of the random access process in FIG. 16 and FIG. 18 is also different. In FIG. 16, the terminal device indicates the ending of the random access process in the case that the RAR is received, while in FIG. 18, the terminal device indicates the ending of the random access process in the case that the updated first system message is received or after the first information is sent through the random access preamble.

[0329] Embodiment 16, as shown in FIG. 19, the terminal device can send the first system message request through the contention random access resource. Specifically:

[0330] 1. The terminal device can send the random access preamble to the network device, and the random access preamble is used for random access, and can also be understood as being used for uplink synchronization.

[0331] 2. The network device sends the RAR to the terminal device.

[0332] 3. The terminal device sends the first information to the network device through the message 3 in the random access. The terminal device can detect the updated first system message after sending the message 3.

[0333] 4. The network device receives the first information, confirms whether the first system message is changed, and broadcasts the updated first system message in the case that the first system message is changed. The terminal device ends the random access process in the case that the updated first system message is received. Alternatively, the terminal device can send the first information once or multiple times through the message 3, and can end the random access process after sending the first information for a certain number of times.

[0334] It should be noted that, compared with FIG. 17, the network device does not need to send the contention resolution message, and can directly broadcast the updated first system message in the case that it is determined that the first system message is changed. The terminal device does not expect to receive the contention resolution message after sending the first information through the message 3, and can start detecting the updated first system message after sending the message 3. Secondly, the ending of the random access process in FIG. 17 and FIG. 19 is also different. In FIG. 17, the terminal device indicates the ending of the random access process in the case that the contention resolution message is received, while in FIG. 19, the terminal device indicates the ending of the random access process in the case that the updated first system message is received or after the first information is sent through the message 3.

[0335] The method embodiments provided by the embodiments of the present application are described above, and the device embodiments related by the embodiments of the present application are described below.

[0336] Please refer to FIG. 20, which is a structural schematic diagram of a communication device provided by the embodiments of the present application. The communication device can be a terminal device, or a device (for example, a chip, or a chip system, or a circuit) in the terminal device. As shown in FIG. 20, the communication device 2000 at least includes a transceiver unit 2001 and a processing unit 2002; wherein:

[0337] In a possible implementation, when the communication device 2000 is used to implement the functions of the terminal device in the method embodiments shown in FIG. 3:

[0338] The transceiver unit 2001 is configured to receive first indication information and send a first system message request to request a first system message, wherein the first indication information is used to indicate a system message update.

[0339] Optionally, the transceiver unit 2001 receives the first indication information and sends the first system message request to request the first system message, specifically for: in the case of receiving the first indication information, if the terminal device does not detect an updated first system message, the first system message request is sent to request the first system message.

[0340] Optionally, the transceiver unit 2001 receives the first indication information and sends the first system message request to request the first system message, specifically for: in the case of receiving the first indication information, if the terminal device detects an updated first system message, the first system message request is not sent to request the first system message.

[0341] Optionally, the processing unit 2002 detects the updated first system message, specifically for: detecting the related information of the first system message, if the stored related information of the first system message and the detected related information of the first system message are the same, it is determined that the updated first system message is not detected; or, the terminal device does not receive the first system message, it is determined that the updated first system message is not detected; or, the terminal device receives the first indication information and does not detect the first system message within a preset time, it is determined that the updated first system message is not detected; wherein, the preset time is the time from receiving the first indication information to sending the first system message request; or, detecting the related information of the first system message, if the stored related information of the first system message and the detected related information of the first system message are different, it is determined that the updated first system message is detected; or, the transceiver unit 2001 receives the first system message, it is determined that the updated first system message is detected; or, the transceiver unit 2001 receives the first indication information and detects the first system message within a preset time, it is determined that the updated first system message is detected.

[0342] Optionally, the preset time is before the end of the next MP of the MP in which the first indication information is received.

[0343] Optionally, the transceiver 2001 receives the first indication information and sends the first system message request to request the first system message, specifically for: receiving the first indication information, and sending the first system message request to request the first system message within a first time.

[0344] Optionally, the first time is the time of the resource closest to the time of receiving the first indication information at which the first system message request can be sent, the time of the resource closest to the time of receiving the first indication information at which the first system message request can be sent is the time interval between the time of the resource and the time of receiving the first indication information, the time of the resource is the system frame number, subframe, time slot or symbol of the resource, the time of the resource is the start time or end time of the resource; or the first time is the current MP of the change period MP in which the first indication information is received; or the first time is the time of the resource closest to the time of receiving the first indication information at which the first system message request can be sent within the current MP; or the first time is the next MP of the change period MP in which the first indication information is received; or the first time is before the T1 time of the next MP of the change period MP in which the first indication information is received; or the first time is a preset time period after the first indication information is received, or the first time is a preset time period after the start time of the next MP of the change period MP in which the first indication information is received.

[0345] Optionally, the resource is a random access resource, an uplink grant resource or an uplink resource, and the random access resource is a contention random access resource, a non-contention random access resource or a dedicated random access resource.

[0346] Optionally, the resource is a contention random access resource, and the transceiver 2001 sends the first system message request, specifically for: sending the first system message request through a random access message 3; or the resource is a non-contention random access resource, and the transceiver 2001 sends the first system message request, specifically for: sending the first system message request through a random access preamble, and the random access preamble is used to request the first system message.

[0347] Optionally, the transceiver 2001 is further configured to receive a random access response, and the random access response is used to indicate that the random access is successful.

[0348] Optionally, the transceiver 2001 is further configured to receive an updated first system information block.

[0349] Optionally, the first indication information is included in a paging message or a short message.

[0350] Optionally, the first indication information is included in a short message field in the DCI format 1_0.

[0351] Optionally, the first system message is SIB1.

[0352] Optionally, the first system message is requested as on-demand SIB1 or WUS.

[0353] In another possible implementation, when the communication apparatus 2000 is configured to implement the function of the terminal device in the method embodiment shown in FIG. 14, the processor 2002 is configured to:

[0354] The transceiver 2001 is configured to send first information, the first information being used for requesting to determine whether a first system message is valid.

[0355] Optionally, the transceiver 2001 sends the first information, and specifically, periodically sends the first information.

[0356] Optionally, the transceiver 2001 periodically sends the first information, and specifically, periodically sends the first information within a first time length, one period being an MP of a cell, and the first time length being less than the MP of the cell.

[0357] Optionally, the transceiver 2001 sends the first information, and specifically, sends the first information through a random access resource, an uplink grant resource or an uplink resource, the random access resource being a contention random access resource or a non-contention random access resource.

[0358] Optionally, the resource is the contention random access resource, and the sending of the first information includes sending the first information through a random access message 3; or the resource is the non-contention random access resource, and the sending of the first information includes sending the first information through a random access preamble, the random access preamble being used for indicating the first information.

[0359] Optionally, the transceiver 2001 is further configured to receive a random access response, the random access response being used for indicating that random access is successful.

[0360] Optionally, the first indication information is included in a paging message or a short message.

[0361] Optionally, the first indication information is included in a short message field in the DCI format 1_0.

[0362] Optionally, the first system message is SIB1.

[0363] Optionally, the first system message is requested as on-demand SIB1 or WUS.

[0364] The communication apparatus can be a network device, or a device (for example, a chip, or a chip system, or a circuit) in the network device.

[0365] In a possible implementation, when the communication apparatus 2000 is configured to implement the function of the network device in the method embodiment shown in FIG. 3:

[0366] The transceiver 2001 is configured to send first indication information to the terminal device, where the first indication information is used to indicate system message change.

[0367] The transceiver 2001 is further configured to send the updated first system message in a case where the first system message request is received from the terminal device.

[0368] Optionally, the transceiver 2001 is further configured to not send the first system message or not page the terminal device in a case where the first system message request is not received from the terminal device.

[0369] Optionally, the transceiver 2001 is configured to send the updated first system message in a case where the first system message request is received from the terminal device, and specifically configured to: in a case where the first system message request is received from the terminal device, send the updated first system message within a second time.

[0370] Optionally, the second time is a next MP or next two MPs of the MP of the first indication information, or the second time is a T2 time of the next MP of the MP of the first indication information, or the second time is a preset time after the first system message request is received from the terminal device.

[0371] Optionally, the transceiver 2001 is configured to not send the first system message in a case where the first system message request is not received from the terminal device, and specifically configured to: in a case where the first system message request is not received from the terminal device, not send the updated first system message within a next MP of the MP of the first indication information.

[0372] Optionally, the transceiver 2001 is configured to receive the first system message request from the terminal device, and specifically configured to: receive the first system message request from the terminal device through a random access resource, an uplink grant resource, or an uplink resource, where the random access resource is a contention random access resource, a non-contention random access resource, or a dedicated random access resource.

[0373] In a possible implementation, the resource is a contention random access resource, and the transceiver 2001 receives the first system message request from the terminal device, specifically by receiving the first system message request through a random access message 3; or, the resource is a non-contention random access resource, and the transceiver 2001 receives the first system message request from the terminal device, specifically by receiving the first system message request through a random access preamble, where the random access preamble is used to request the first system message.

[0374] In a possible implementation, the transceiver 2001 is further configured to send a random access response, where the random access response is used to indicate that the random access is successful.

[0375] Optionally, the first system message is an SIB1.

[0376] In another possible implementation, when the communication apparatus 2000 is configured to implement the functions of the network device in the method embodiment shown in FIG. 14, the transceiver 2001 is configured to:

[0377] The transceiver 2001 is configured to receive first information, and determine whether the first system message is valid, where the first information is used to request to determine whether the first system message is valid.

[0378] If it is determined that the first system message is invalid, the transceiver 2001 is further configured to broadcast the first system message to the terminal device and / or send second information, where the second information is used to indicate whether the first system message is valid.

[0379] Optionally, the transceiver 2001 is further configured to, if it is determined that the first system message is valid, broadcast a confirmation message to the terminal device, where the confirmation message is used to confirm that the first system message is valid.

[0380] Optionally, the first system message being valid includes: if it is detected that the related information of the first system message is the same as the related information of the first system message used by the terminal device, the first system message is valid; or, if it is detected that the related information of the first system message is different from the related information of the first system message used by the terminal device, the first system message is invalid.

[0381] Optionally, the transceiver 2001 receives the first information, specifically by receiving the first information through a random access resource, an uplink grant resource, or an uplink resource, where the random access resource is a contention random access resource or a non-contention random access resource.

[0382] Optionally, the resource is a contention-based random access resource, and the transceiver 2001 receives the first information through a random access message 3; or the resource is a non-contention-based random access resource, and the transceiver 2001 receives the first information through a random access preamble, the random access preamble being used to indicate the first information.

[0383] Optionally, the transceiver 2001 is further configured to send a random access response, the random access response being used to indicate that the random access is successful.

[0384] It can be understood that the specific implementation of the transceiver 2001 can refer to the method embodiments in FIGS. 3-19.

[0385] Optionally, the first system message is SIB1.

[0386] Referring to FIG. 21, FIG. 21 is a structural schematic diagram of another communication apparatus provided by the embodiment of the present application. The apparatus 210 is configured to implement the function of the network element of the present application, for example, the network element can be an access network device, a terminal device, a DU or a CU. The apparatus 210 can be the network element, or a device capable of being installed in the network element, or a device capable of being used with the network element, without limitation, for example, the device can be a chip or a chip system. As shown in FIG. 21, the apparatus 210 includes an interface 111 and a processor 112. Optionally, the processor 112 is configured to execute a program 114. The processor 112 can store the program 114, or obtain the program 114 from other devices or other devices (for example, from a memory 113 or from a third-party website, etc.). Optionally, the apparatus 210 includes the memory 113. The memory 113 is configured to store a program 115. The program 115 can be pre-stored or subsequently loaded. Optionally, the memory 113 can also be configured to store necessary data. These components work together to provide various functions described in the present application.

[0387] The processor 112 includes one or more processors as a combination of computing devices. The processor 112 can include one or more of the following respectively: a microprocessor, a microcontroller, a digital signal processor (DSP), a digital signal processing device (DSPD), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (PLD), a gate logic, a transistor logic, a discrete hardware circuit, a processing circuit, or other suitable hardware, firmware, and / or a combination of hardware and software configured to perform various functions described in the present application. The processor 112 can be a general-purpose processor or a special-purpose processor. For example, the processor 112 can be a baseband processor or a central processor. The baseband processor can be used to process communication protocols and communication data. The central processor can be used to execute software programs and process data in the software programs.

[0388] Interface 111 can include any suitable hardware or software for enabling communication with one or more computer devices, such as the network elements of the present application. For example, in some embodiments, interface 111 can include terminals and / or pins for coupling wires for a wired connection or a wireless transceiver for coupling a wireless connection. In some embodiments, interface 111 can include a transmitter, a receiver, a transceiver, and / or an antenna. The interface can be configured to enable communication between computer devices, such as the network elements of the present application, using any available protocol, such as a 3GPP standard protocol.

[0389] A program in the present application refers to software in a broad sense. The software can be program code, a program, a subprogram, an instruction set, a code segment, a software module, an application, a software application, etc. The program can be run in a processor and / or a computer to perform various functions and / or processes described in the present application.

[0390] Memory 113 can store necessary data required when processor 112 executes software. Memory 113 can be implemented using any suitable storage technology. For example, memory 113 can be any available storage media that can be accessed by a processor and / or a computer. Non-limiting examples of storage media are random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), a removable media, an optical disc storage, a magnetic storage device, a flash memory, a register, a state machine, a remote storage, a local or remote storage component, or any other storage medium that can carry or store software, data, or information and can be accessed by a processor / computer.

[0391] Memory 113 and processor 112 can be separately arranged or integrated together. Processor 112 can read information from memory 113, store and / or write information in memory. Memory 113 can be integrated in processor 112. Processor 112 and memory 113 can be arranged in an integrated circuit, such as an application-specific integrated circuit (ASIC). The integrated circuit can be arranged in a network element or other network node of the present disclosure.

[0392] Optionally, the apparatus 210 in the embodiments of the present application can be used to execute the methods described in the embodiments of the present application.

[0393] Please refer to FIG. 22, which is a structural schematic diagram of a terminal device provided in the embodiments of the present application. For the convenience of explanation, FIG. 22 only shows the main components of the terminal device. As shown in FIG. 22, the terminal device 2200 includes a processor, a memory, a control circuit, an antenna, and an input / output device. The processor is mainly used for processing communication protocols and communication data, controlling the whole terminal, executing software programs, and processing the data of the software programs. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, a display screen, a keyboard, etc., is mainly used for receiving user input data and outputting data to the user.

[0394] When the terminal is powered on, the processor can read the software programs in the storage unit, parse and execute the instructions of the software programs, and process the data of the software programs. When data needs to be transmitted wirelessly, the processor performs baseband processing on the data to be transmitted, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit processes the baseband signal to obtain a radio frequency signal, and transmits the radio frequency signal in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal, the radio frequency circuit receives the radio frequency signal through the antenna. The radio frequency signal is further converted into a baseband signal, and the baseband signal is output to the processor. The processor converts the baseband signal into data and processes the data.

[0395] For the convenience of explanation, FIG. 22 only shows one memory and one processor. In actual terminals, there can be multiple processors and memories. The memory can also be referred to as a storage medium or a storage device, etc., and the embodiments of the present application do not limit this.

[0396] As an optional implementation, the processor can include a baseband processor and a central processor, the baseband processor is mainly used for processing communication protocols and communication data, and the central processor is mainly used for controlling the whole terminal, executing a software program, and processing data of the software program. The processor in FIG. 22 integrates the functions of the baseband processor and the central processor, and a person skilled in the art can understand that the baseband processor and the central processor can also be independent processors interconnected by a bus or the like. A person skilled in the art can understand that the terminal can include multiple baseband processors to adapt to different network modes, and the terminal can include multiple central processors to enhance the processing capability, and various components of the terminal can be connected through various buses. The baseband processor can also be referred to as a baseband processing circuit or a baseband processing chip. The central processor can also be referred to as a central processing circuit or a central processing chip. The function of processing communication protocols and communication data can be built into the processor, or stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

[0397] In one example, the antenna and the control circuit with the transceiving function can be regarded as a transceiving unit 2201 of the terminal device 2200, and the processor with the processing function can be regarded as a processing unit 2202 of the terminal device 2200. As shown in FIG. 22, the terminal device 2200 includes the transceiving unit 2201 and the processing unit 2202. The transceiving unit can also be referred to as a transceiver, a transceiver, a transceiving device, etc. Optionally, the device for realizing the receiving function in the transceiving unit 2201 can be regarded as a receiving unit, and the device for realizing the sending function in the transceiving unit 2201 can be regarded as a sending unit, that is, the transceiving unit 2201 includes the receiving unit and the sending unit. Exemplarily, the receiving unit can also be referred to as a receiver, a receiver, a receiving circuit, etc., and the sending unit can be referred to as a transmitter, a transmitter or a transmitting circuit, etc. Optionally, the above-mentioned receiving unit and sending unit can be integrated into one unit, or can be multiple independent units. The above-mentioned receiving unit and sending unit can be in one geographical location, or can be dispersed in multiple geographical locations.

[0398] In one embodiment, the transceiving unit 2201 is configured to perform the operations performed by the transceiving unit 2001 in the above-mentioned embodiments. The terminal device 2200 can also be configured to perform various methods performed by the terminal device in the above-mentioned method embodiments, which will not be described herein.

[0399] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the processes related to the terminal device and the network device in the communication method provided by the above-mentioned method embodiments.

[0400] The embodiments of the present application further provide a computer program product, which, when running on a computer or a processor, enables the computer or the processor to perform one or more steps of any one of the above communication methods. The constituent modules of the above-mentioned devices, if realized in the form of software function units and sold or used as independent products, can be stored in the computer readable storage medium.

[0401] The embodiments of the present application further provide a chip system, which comprises at least one processor and a communication interface, the communication interface and the at least one processor are interconnected through a line, and the at least one processor is used to run computer programs or instructions to execute part or all steps of any one of the above-mentioned corresponding method embodiments. The chip system can be composed of a chip, or can contain a chip and other discrete devices.

[0402] The embodiments of the present application further provide a communication system, which comprises a terminal device and a network device, and the specific description can be referred to the above-mentioned method.

[0403] It should be appreciated that the memory mentioned in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a hard disk drive (HDD), a solid-state drive (SSD), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example, but not limitation, many forms of RAM can be used, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). The memory is any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto. The memory in the embodiments of the present application can also be a circuit or any other device capable of realizing a storage function, used for storing program instructions and / or data.

[0404] It should also be understood that the processor mentioned in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0405] It should be noted that when the processor is a general 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.

[0406] It should be noted that the memory described herein is intended to include, but not limited to, these and any other suitable types of memory.

[0407] It should be understood that the size of the sequence number of the above-mentioned processes in various embodiments of the present application does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0408] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments provided herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0409] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-mentioned system, device and unit can be referred to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0410] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be realized by other ways. For example, the above-mentioned device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0411] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0412] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0413] The functions, if implemented in the form of software functional units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the parts of the technical solutions that make essential contributions or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, and various program code storage media.

[0414] The steps in the method embodiments of the present application can be adjusted, combined, and reduced in sequence according to actual needs.

[0415] The modules / units in the device embodiments of the present application can be combined, divided, and reduced according to actual needs.

[0416] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for system message updating, applied to a terminal device, characterized in that, The method comprises: receiving first indication information, and sending a first system message request to request a first system message, the first indication information being used to indicate system message change.

2. The method of claim 1, wherein, The receiving of the first indication information and the sending of the first system message request to request the first system message comprise: In the case of receiving the first indication information, if the terminal device does not detect an updated first system message, the first system message request is sent to request the first system message.

3. The method of claim 1, wherein, The receiving of the first indication information and the sending of the first system message request to request the first system message comprise: In the case of receiving the first indication information, if the terminal device detects an updated first system message, the first system message request is not sent to request the first system message.

4. The method according to claim 2 or 3, characterized in that, The terminal device detecting an updated first system message comprises: The terminal device detects the relevant information of the first system message, and if the stored relevant information of the first system message and the detected relevant information of the first system message are the same, it is determined that no updated first system message is detected; or The terminal device does not receive the first system message, and it is determined that no updated first system message is detected; or The terminal device receives the first indication information and does not detect the first system message within a preset time, and it is determined that no updated first system message is detected; wherein the preset time is the time from receiving the first indication information to sending the first system message request; Or The terminal device detects the relevant information of the first system message, and if the stored relevant information of the first system message and the detected relevant information of the first system message are different, it is determined that an updated first system message is detected; or The terminal device receives the first system message, and it is determined that an updated first system message is detected; or The terminal device receives the first indication information and detects the first system message within the preset time, and it is determined that an updated first system message is detected.

5. The method of claim 4, wherein, The preset time is before the end of the next MP of the change period MP of the first indication information.

6. The method according to any of claims 1 or 2, characterized in that, The receiving of the first indication information and the sending of the first system message request to request the first system message comprise: The receiving of the first indication information and the sending of the first system message request to request the first system message comprise:

7. The method of claim 6, wherein: The first time is the time of the nearest resource capable of sending the first system message request after receiving the first indication information, and the time of the nearest resource capable of sending the first system message request is the time interval between the time of the resource and the time of receiving the first indication information; The time is the system frame number, subframe, time slot or symbol of the resource; or The first time is the current MP of the change period MP of receiving the first indication information; or The first time is the time of the nearest resource capable of sending the first system message request after receiving the first indication information within the current MP; or The first time is the next MP of the change period MP of receiving the first indication information; or The first time is the next MP of the change period MP of receiving the first indication information; or The first time is before a T1 time of a next MP of a change period MP of the first indication information; or The first time is a preset time length after receiving the first indication information, or the first time is a preset time length after a start time of a next MP of a change period MP of the first indication information.

8. The method of claim 7, wherein, The resource is a random access resource, an uplink grant resource, or an uplink resource, and the random access resource is a contention random access resource, a non-contention random access resource, or a dedicated random access resource.

9. The method of claim 8, wherein The resource is a contention random access resource, and the sending the first system message request comprises: sending the first system message request through a random access message 3; or The resource is a non-contention random access resource, and the sending the first system message request comprises: sending the first system message request through a random access preamble, the random access preamble being used for requesting a first system message.

10. The method of claim 9, wherein, The method further comprises: receiving a random access response, the random access response being used for indicating random access success.

11. The method according to any one of claims 1 to 10, characterized in that, The method further comprises: receiving an updated first system message.

12. The method according to any one of claims 1 to 11, characterized in that, The first indication information is included in a paging message or a short message.

13. The method of claim 12, wherein, The first indication information is included in a short message field in a downlink control information (DCI) format 1_0.

14. The method according to any one of claims 1 to 13, characterized in that, The first system message is a system information block 1 (SIB1).

15. The method according to any one of claims 1 to 14, characterized in that, The first system message request is an on-demand system information block 1 (SIB1) or a wake-up signal (WUS).

16. A method for system message updating, applied to a network device, the method comprising: The method comprises: sending first indication information to a terminal device, the first indication information being used for indicating system message change; in a case where a first system message request from the terminal device is received, sending an updated first system message.

17. The method of claim 16, wherein, The method further comprises: in a case where the first system message request from the terminal device is not received, not sending the first system message or not paging the terminal device.

18. The method of claim 16, wherein, The in the case where the first system message request from the terminal device is received, sending the updated first system message, comprises: in the case where the first system message request from the terminal device is received, sending the updated first system message within a second time.

19. The method of claim 18, wherein The second time is a next MP or next two MPs of a change period MP of the first indication information; or The second time is a T2 time of a next MP of a change period MP of the first indication information. or The second time is a preset time after receiving the first system message request from the terminal device.

20. The method of claim 17, wherein, The in the case where the first system message request from the terminal device is not received, not sending the first system message, comprises: in the case where the first system message request from the terminal device is not received, not sending an updated first system message within a next MP of a change period MP of first indication information.

21. The method of any one of claims 16, 18-19, wherein, The receiving the first system message request from the terminal device, comprises: The first system message request is received from the terminal device through a random access resource, an uplink grant resource, or an uplink resource, the random access resource being a contention random access resource, a non-contention random access resource, or a dedicated random access resource.

22. The method of claim 21, wherein, the resource is a contention random access resource, and the receiving the first system message request from the terminal device comprises: receiving the first system message request through a random access message 3; or the resource is a non-contention random access resource, and the receiving the first system message request from the terminal device comprises: receiving the first system message request through a random access preamble, the random access preamble being used to request the first system message.

23. The method of claim 22, wherein, The method further comprises: sending a random access response, the random access response being used to indicate that the random access is successful.

24. The method according to any one of claims 16-23, characterized by, The first indication information is included in a paging message or a short message.

25. The method of claim 24, wherein, The first indication information is included in a short message field in a downlink control information (DCI) format 1_0.

26. The method of any one of claims 16-25, wherein, The first system message is a system information block 1 (SIB1).

27. The method of any one of claims 16-26, wherein, The first system message request is an on-demand system information block 1 (SIB1) or a wake-up signal (WUS).

28. A method for system information updating, applied to a terminal device, comprising: The method comprises: sending first information, the first information being used to request a determination of whether the first system message is valid.

29. The method of claim 28, wherein, The sending of the first information comprises: periodically sending the first information.

30. The method of claim 29, wherein, The periodically sending of the first information comprises: periodically sending the first information within a first time length, one period being an MP of one cell, and the first time length being less than the MP of one cell.

31. The method of any one of claims 28-30, wherein, The sending of the first information comprises: sending the first information through a random access resource, an uplink grant resource, or an uplink resource, the random access resource being a contention random access resource or a non-contention random access resource.

32. The method of claim 31, wherein, the resource is a contention random access resource, and the sending of the first information comprises: sending the first information through a random access message 3; or 33. The method of claim 31 or 32, wherein, the resource is a non-contention random access resource, and the sending of the first information comprises: sending the first information through a random access preamble, the random access preamble being used to indicate the first information.

34. The method of any one of claims 28-33, wherein, The method further comprises:

35. A method for system information updating, applied to a network device, the method comprising: receiving a random access response, the random access response being used to indicate that the random access is successful. The first system message is a system information block 1 (SIB1). The method comprises:

36. The method of claim 35, wherein, receiving first information, determining whether the first system message is valid, the first information being used to request a determination of whether the first system message is valid; if it is determined that the first system message is invalid, broadcasting the first system message to the terminal device and / or sending second information, the second information being used to indicate whether the first system message is valid.

37. The method of claim 35 or 36, wherein, The method further comprises: if it is determined that the first system message is valid, broadcasting a confirmation message to the network device, the confirmation message being used to confirm that the first system message is valid. The first system message being valid comprises: The first system message is valid if the detected information related to the first system message is identical to the information related to the first system message used by the terminal device, or the first system message is invalid if the detected information related to the first system message is different from the information related to the first system message used by the terminal device.

38. The method of any one of claims 35-37, wherein, The receiving the first information comprises: The first information is received through a random access resource, an uplink grant resource or an uplink resource, the random access resource being a contention random access resource or a non-contention random access resource.

39. The method of claim 38, wherein, The resource is a contention random access resource, and the receiving the first information comprises: The first information is received through a random access message 3; or The resource is a non-contention random access resource, and the receiving the first information comprises: The first information is received through a random access preamble, the random access preamble being used to indicate the first information.

40. The method of any one of claims 35-39, wherein, The method further comprises: Sending a random access response, the random access response being used to indicate that the random access is successful.

41. The method of any one of claims 35-40, wherein, The first system message is a system information block 1 (SIB1).

42. A communications device, characterized by The communication apparatus comprises a processor and a storage medium, the storage medium storing instructions, when the instructions are run by the processor, the method in any one of claims 1-15 or the method in any one of claims 16-27 or the method in any one of claims 28-34 or the method in any one of claims 35-41 is implemented.

43. A computer-readable storage medium, comprising: The computer readable storage medium comprises instructions, when the instructions are run by the processor, the method in any one of claims 1-15 or the method in any one of claims 16-27 or the method in any one of claims 28-34 or the method in any one of claims 35-41 is implemented.

44. A communication system, characterized by The terminal device is configured to implement the method in any one of claims 1-15 or the method in any one of claims 28-34, and the network device is configured to implement the method in any one of claims 16-27 or the method in any one of claims 35-41.

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