Communication method and apparatus

Abstract

The present application relates to a communication method and apparatus. A network device can determine a second identifier of a terminal device on the basis of a first identifier of the terminal device, wherein the number of bits occupied by the second identifier is less than the number of bits occupied by the first identifier; and the network device sends a first message, wherein the first message is used for paging the terminal device or is used for prompting the terminal device that the terminal device has an incoming service or has missed a called service, and the first message comprises the second identifier. The embodiments of the present application reduce the length of an identifier of a terminal device, such that the signaling overheads are saved on.

Description

Communication method and apparatus

[0001] Cross-reference to Related Applications

[0002] This application claims priority to a Chinese patent application No. 202410475456.7, filed on April 17, 2024, and entitled “A communication method and apparatus”, the content of which is incorporated herein by reference in its entirety; and this application claims priority to a Chinese patent application No. 202411254392.4, filed on September 6, 2024, and entitled “A communication method and apparatus”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of communication technology, and in particular to a communication method and apparatus. BACKGROUND

[0004] When a user equipment (UE) has no service transmission, the UE can enter a radio resource control (RRC) non-connected state, so as to save power consumption. After the UE enters the RRC non-connected state, if service of the UE arrives again, the UE can not be able to transmit. SUMMARY

[0005] Embodiments of the present application provide a communication method and apparatus, which enable a UE to transmit service.

[0006] In a first aspect, a first communication method is provided, which can be performed by a network apparatus. The network apparatus is, for example, a network device, or other device including a function of the network device, or a chip system (or, a chip) or other functional module capable of implementing the function of the network device, which is, for example, arranged in the network device. The network device includes, for example, a core network device and / or an access network device. Hereinafter, the network apparatus is taken as an example of the network device. The method includes: determining a second identifier of a terminal device according to a first identifier of the terminal device, the second identifier occupying a number of bits less than a number of bits occupied by the first identifier; and sending a first message, the first message being used for paging the terminal device, or being used for prompting the terminal device that service has arrived, or being used for prompting the terminal device that a called service is missed, wherein the first message includes the second identifier. Optionally, the first message does not include the first identifier.

[0007] In the embodiments of the present application, if the terminal device is in the RRC non-connected state, the network device can page the terminal device or prompt the terminal device that there is service arrival through the first message, so that the terminal device can start to transmit the service after receiving the first message, and the success rate of service transmission is improved. Or the network device can prompt the terminal device that the called service is missed through the first message, so that the terminal device can prompt the user of the missed service, thereby prompting the user to make a voice callback or message acquisition, and avoiding that the user misses important information. In addition, the first message can include the second identifier of the terminal device, and the number of bits occupied by the second identifier can be less than the number of bits occupied by the first identifier of the terminal device, which means that the length of the identifier is reduced in the embodiments of the present application, and the signaling overhead can be saved. Optionally, since the overhead of the first message is small, it is more conducive to improving the coverage of the first message, for example, the network device can send the first message multiple times to achieve a better prompting effect on the terminal device.

[0008] In an optional implementation, the second identifier of the terminal device is determined according to the first identifier of the terminal device, including: determining the second identifier according to the first identifier, and the first information and / or the second information. Some ways of determining the second identifier according to the first identifier are provided.

[0009] In an optional implementation, the second identifier includes all or part of bits in the first identifier except high M2 bits; or, the second identifier includes all or part of bits in the first identifier except high M2 bits, and further includes M3 bits, wherein the value of the M3 bits is a first value, the first value is used to indicate the core network device registered by the terminal device, M2 and M3 are positive integers, and M3 is less than M2; wherein the high M2 bits are used to carry the identifier of the core network device registered by the terminal device. Because even if the core network device registered by the terminal device is not indicated to the terminal device, or the core network device currently initiating paging is indicated, the terminal device can also determine the corresponding core network device. Therefore, the second identifier can include all or part of bits in the first identifier except high M2 bits, and the transmission overhead of the second identifier is small. In addition, if the access network device corresponding to the first cell corresponds to multiple core network devices, in this case, the core network device registered by the terminal device can be indicated to the terminal device through the second identifier, for example, the second identifier can include M3 bits to indicate the core network device registered by the terminal device. Because M3 is less than M2, the number of bits of the first identifier is reduced, and the transmission overhead is saved.

[0010] In an optional implementation, the value of the M3-bit is used to indicate the core network device corresponding to the first cell, and the core network device registered by the terminal device is one of the core network devices corresponding to the first cell; or, the value of the M3-bit is used to indicate the core network device corresponding to the access network device corresponding to the first cell, and the core network device registered by the terminal device is one of the core network devices corresponding to the access network device corresponding to the first cell. The M3-bit can indicate the core network device corresponding to the first cell, or can also indicate the core network device corresponding to the access network device corresponding to the first cell, and no limitation is made.

[0011] In an optional implementation, the M3-bit is located at the high bit or low bit of the second identifier, or can also be located at the middle position of the second identifier. The distribution of the M3-bit in the second identifier is flexible.

[0012] In an optional implementation, the method further includes: sending first information, the first information being used to indicate the association between the value of the M3-bit and the core network device corresponding to the first cell, or to indicate the association between the value of the M3-bit and the core network device corresponding to the access network device corresponding to the first cell. The access network device or the core network device can send the first information, so that the terminal device can determine the second identifier or the core network device registered by the terminal device according to the first information.

[0013] In an optional implementation, the first information is information related to the core network device corresponding to the first cell, or is information related to the core network device corresponding to the access network device corresponding to the first cell, wherein the first information is used to determine the M3, and the first cell is a cell in which the terminal device resides.

[0014] In an optional implementation, the second identifier includes part or all of the bits in the first identifier except the low M1-bit. For example, the low M1-bit of the first identifier of different terminal devices corresponding to the same receiving occasion is the same, and therefore the low M1-bit of the first identifier cannot be used to distinguish different terminal devices in the same receiving occasion. Therefore, the second identifier can not include the low M1-bit of the first identifier, so as to reduce redundant information.

[0015] In an optional implementation, the second information includes a parameter related to the receiving occasion of the first message, wherein the second information is used to determine the M1. The second information can include a parameter related to the receiving occasion of the first message, and the terminal device can determine the receiving occasion and / or the M1 according to the second information.

[0016] In an optional implementation, the parameter related to the receiving occasion of the first message comprises: a number of receiving frames included in a receiving period of the first message, and / or a number of receiving occasions corresponding to the terminal device included in a receiving frame; or, a number of receiving occasions corresponding to the terminal device included in the receiving period of the first message.

[0017] In an optional implementation, M1 satisfies the following relationship: M1=(log2N+log2N s ), where N represents the number of receiving frames included in the receiving period, and N s represents the number of receiving occasions corresponding to the terminal device included in a receiving frame. This is an optional way for the terminal device to determine M1, where N and / or N s For example, is indicated or included in the second information.

[0018] In an optional implementation, M1 satisfies the following relationship: M1=(log2X), where X represents the number of receiving occasions corresponding to the terminal device included in the receiving period. This is another optional way for the terminal device to determine M1, where X is indicated or included in the second information, for example.

[0019] In an optional implementation, the method further comprises: sending the second information. The access network device or the core network device can send the second information, so that the terminal device can determine M1 and / or determine the receiving occasion, etc. according to the second information.

[0020] In an optional implementation, the method further comprises: sending the first message at a receiving occasion corresponding to the terminal device, which is determined according to the second information. The access network device or the core network device can also determine the receiving occasion according to the content indicated by the second information, and then send the first message at the receiving occasion.

[0021] In an optional implementation, the method further comprises: receiving a first paging message from the core network device, where the first paging message is used to page the terminal device, and the first paging message comprises the first identifier; or, receiving a second message from the core network device, where the second message is used to prompt the terminal device that there is incoming service, or is used to prompt the terminal device that the terminal device has missed a called service, and the second message comprises the first identifier. The core network device can send the first paging message or the second message to the access network device; after receiving the first paging message or the second message, the access network device can send the first message.

[0022] In an optional implementation, the first paging message is further used to indicate that the terminal device has the capability of receiving a message for prompting the terminal device of arrival of service or receiving a message for prompting the terminal device of missing of a called service; or, the first paging message is further used to indicate that a message for prompting the terminal device of arrival of service or missing of a called service is sent to the terminal device. The first paging message can indicate the corresponding capability of the terminal device, so that the access network device can determine to send which first message. Or the first paging message can indicate the type of the first message (for example, a message for prompting the terminal device of arrival of service), and then the access network device can send the first message according to the indication of the core network device, without determining the type of the first message again.

[0023] In an optional implementation, the first message is used to page the terminal device, and the method further includes: in a case where a response of the terminal device to the first message is not received, sending a third message, the third message being used to prompt the terminal device of arrival of service or being used to prompt the terminal device of missing of a called service. If the response of the terminal device is not received, the third message can be sent again to improve the probability of finding the terminal device.

[0024] In an optional implementation, the method further includes: receiving auxiliary information from the terminal device; and determining one or more of the following according to the auxiliary information: the signal quality of the terminal device is lower than a first threshold, the terminal device is located at a cell edge, or the terminal device tends to receive a message for prompting the terminal device of arrival of service or missing of a called service. For example, the access network device or the core network device can determine, according to the auxiliary information, that when the terminal device is found, the second identifier can be sent without sending the first identifier, to improve the probability of finding the terminal device.

[0025] In a second aspect, a second communication method is provided, which can be performed by a terminal device. The terminal device is, for example, a terminal device, or another device including a terminal device function, or a chip system (or chip) or another functional module capable of implementing the function of a terminal device, which is, for example, arranged in a terminal device. Hereinafter, the terminal device is taken as an example of a terminal device. The method includes: receiving a first message in a first cell; in a case where the first message includes a second identifier of a terminal device, entering an RRC connected state, or outputting a prompt message, the prompt message being a message for prompting the terminal device of arrival of service or missing of a called service, wherein the second identifier is determined according to a first identifier of the terminal device, and the second identifier occupies a smaller number of bits than the first identifier.

[0026] In an optional implementation, the method further includes: determining the second identifier according to the first identifier, and the first information and / or the second information.

[0027] In an optional implementation, the second identifier includes all or part of bits in the first identifier except high M2 bits; or, the second identifier includes all or part of bits in the first identifier except high M2 bits, and further includes M3 bits, where a value of the M3 bits is a first value, the first value is used to indicate a core network device to which the terminal device is registered, M2 and M3 are positive integers, and M3 is less than M2; where the high M2 bits are used to carry an identifier of the core network device to which the terminal device is registered.

[0028] In an optional implementation, the value of the M3 bits is used to indicate a core network device corresponding to the first cell, and the core network device to which the terminal device is registered is one of the core network devices corresponding to the first cell; or, the value of the M3 bits is used to indicate a core network device corresponding to an access network device corresponding to the first cell, and the core network device to which the terminal device is registered is one of the core network devices corresponding to the access network device corresponding to the first cell.

[0029] In an optional implementation, the M3 bits are located at a high bit or a low bit of the second identifier.

[0030] In an optional implementation, the method further includes: receiving first information, where the first information is used to indicate an association between the value of the M3 bits and the core network device corresponding to the first cell, or to indicate an association between the value of the M3 bits and the core network device corresponding to the access network device corresponding to the first cell.

[0031] In an optional implementation, the first information is information related to the core network device corresponding to the first cell, or is information related to the core network device corresponding to the access network device corresponding to the first cell, where the first information is used to determine M3.

[0032] In an optional implementation, the second identifier includes part or all of bits in the first identifier except the low M1 bits.

[0033] In an optional implementation, the second information includes a parameter related to a receiving occasion of the first message, where the second information is used to determine M1.

[0034] In an optional implementation, the parameter related to the receiving occasion of the first message comprises: a number of receiving frames included in a receiving period of the first message, and / or a number of receiving occasions corresponding to the terminal device included in one receiving frame; or, a number of receiving occasions corresponding to the terminal device included in the receiving period of the first message.

[0035] In an optional implementation, M1 satisfies the following relationship: M1=(log2N+log2N s ), where N represents the number of receiving frames included in the receiving period, and N s represents the number of receiving occasions corresponding to the terminal device included in one receiving frame.

[0036] In an optional implementation, M1 satisfies the following relationship: M1=(log2X), where X represents the number of receiving occasions corresponding to the terminal device included in the receiving period.

[0037] In an optional implementation, the method further comprises: receiving the second information.

[0038] In an optional implementation, the method further comprises: receiving a third message, the third message being used for prompting the terminal device that there is service arrival or for prompting the terminal device that there is missed call service.

[0039] In an optional implementation, the method further comprises: starting a timer after receiving the first message; if the signal quality of the terminal device is greater than a first threshold before the timer expires, entering the RRC connected state, otherwise, if the timer expires, recording the reason for failure to enter the RRC connected state.

[0040] In an optional implementation, the method further comprises: sending auxiliary information, the auxiliary information being used for indicating one or more of the following: the signal quality of the terminal device is lower than a first threshold, the terminal device is located at a cell edge, or the terminal device tends to receive a message for prompting the terminal device that there is service arrival or missed call service.

[0041] As to the technical effects brought by the second aspect or various optional implementations, reference can be made to the introduction of the technical effects of the first aspect or corresponding implementations.

[0042] In a third aspect, a third communication method is provided, which can be performed by a network device. The network device can be a network equipment, or other equipment including network equipment functions, or a chip system (or chip) or other functional module capable of implementing the functions of the network equipment, which is arranged in the network equipment for example. The network equipment can include a core network equipment and / or an access network equipment. Hereinafter, the network device is taken as an example of the network equipment. The method includes: sending a fourth message, the fourth message being used for paging a first terminal device, or being used for prompting the first terminal device that there is service arrival, or being used for prompting the first terminal device that a called service is missed, wherein the fourth message includes a first alarm identifier corresponding to the first terminal device. Optionally, the first alarm identifier occupies a number of bits smaller than a number of bits occupied by an identifier of the first terminal device.

[0043] In the embodiments of the present application, if the first terminal device is in an RRC non-connected state, the network equipment can page or prompt the first terminal device through the fourth message, so that the first terminal device can start to transmit service after receiving the fourth message, thereby improving the success rate of service transmission, or the network equipment can prompt the terminal device that a called service is missed through the fourth message, so that the terminal device can prompt the user that the service is missed, thereby prompting the user to make a voice callback or message acquisition, and avoiding that the user misses important information. The number of bits occupied by the first alarm identifier can be smaller than the number of bits occupied by the first identifier, which means that the length of the identifier is reduced in the embodiments of the present application, thereby saving signaling overhead. Optionally, since the overhead of the fourth message is small, it is more conducive to improve the coverage of the fourth message. For example, the network equipment can send the fourth message multiple times to improve the success rate of receiving the fourth message by the first terminal device, thereby achieving a better effect of prompting the terminal device. Moreover, since the overhead of the fourth message is small, the saved resources can be used for other transmission processes, thereby improving the resource utilization rate.

[0044] In an optional implementation, the first alarm identifier is determined according to auxiliary information of the first terminal device. For example, the network equipment can allocate alarm identifiers to one or more terminal devices covered by the network equipment according to auxiliary information of the one or more terminal devices, so that the length of the alarm identifier can distinguish the one or more terminal devices, and the length of the alarm identifier is not too long to cause too much redundant information.

[0045] In an optional implementation, the assistance information of the first terminal device comprises one or more of the following: location information of the first terminal device; measurement information of the first terminal device; information indicating whether the first terminal device tends to receive a message prompting the first terminal device of arrival of service or missing of a called service; or, power information indicating a supplemental power of the first terminal device or a power level to which the supplemental power of the first terminal device belongs, wherein the supplemental power of the first terminal device indicates a difference between a required receiving power of the first terminal device and an actual receiving power of the first terminal device. In addition, the assistance information can comprise other information, such as information reflecting a channel quality or other state of the terminal device, without limitation.

[0046] In an optional implementation, the measurement information of the first terminal device comprises one or more of the following: a difference between a signal quality when the first terminal device enters the RRC connected mode this time and a signal quality after the first terminal device enters the RRC connected mode this time; distribution information of a signal quality of the first terminal device in a first time duration in history; or, a signal quality of the first terminal device before the first terminal device enters the RRC connected mode this time.

[0047] In an optional implementation, the first alarm identifier occupies a number of bits greater than or equal to log2K, K represents a number of terminal devices corresponding to the alarm identifier, K is determined according to the assistance information of at least one terminal device, the K terminal devices comprise some or all of the at least one terminal device, the first terminal device belongs to the K terminal devices, and K is a positive integer. For example, the K terminal devices are terminal devices requiring allocation of the alarm identifier, and the first alarm identifier occupies a number of bits equal to log2K, so that the first alarm identifier can distinguish different terminal devices among the K terminal devices. The first alarm identifier occupies a number of bits greater than log2K, which is considered for possible expansion. For example, the network device can subsequently find that there are terminal devices requiring allocation of the alarm identifier, and a reserved value in a value corresponding to the number of bits can be allocated to a new terminal device.

[0048] In an optional implementation, the receiving occasions of the terminal devices corresponding to the same power information are the same. For the K terminal devices to which the alarm identifier is to be allocated, the network device can group them, and allocate an alarm identifier to each group of terminal devices respectively. The lengths of the alarm identifiers corresponding to different groups can be the same or different, so as to make the allocation of the alarm identifier more reasonable, and also save the overhead of the alarm identifier. For example, the network device can group them according to the power information, wherein the terminal devices in each group correspond to the same or similar power information. The receiving occasions of the terminal devices in each group can be the same, or it is understood that this grouping manner is to allocate the terminal devices corresponding to the same power information to the same receiving occasion.

[0049] In an optional implementation, the method comprises: sending the first alarm identifier to the first terminal device; or, sending the first alarm identifier and information of a first area corresponding to the first alarm identifier to the first terminal device. Because the network device allocates the alarm identifier to the terminal device, the network device can send the alarm identifier to the terminal device, so that the terminal device can be clear about the allocated alarm identifier. Optionally, in addition to sending the alarm identifier, the network device can also send the area information to which the alarm identifier is applicable, so that the terminal device can be clear that the alarm identifier can be used in the area, and if the terminal device leaves the area, the terminal device can no longer use the alarm identifier.

[0050] In an optional implementation, the information of the first area comprises longitude and / or latitude of the first area, or the information of the first area comprises information of a geographical grid to which the first area belongs, or the information of the first area comprises information of one or more tracking areas included in the first area, or the information of the first area comprises information of one or more RAN area updates included in the first area, or the information of the first area comprises information of one or more cells included in the first area, or the information of the first area comprises beam information in one or more cells included in the first area.

[0051] In an optional implementation, the fourth message is sent in the following manner: the fourth message is sent at a receiving occasion corresponding to the terminal device, the receiving occasion being determined according to a parameter related to the receiving occasion, or being configured according to alarm identifier of K terminal devices, the first terminal device being one of the K terminal devices. The receiving occasion can be determined according to a related parameter. For example, the network device can send the parameter, and the terminal device can determine the receiving occasion by itself. Alternatively, the network device can determine the receiving occasion, for example, according to the alarm identifier of the K terminal devices. The network device can configure the receiving occasion to the terminal device, and the terminal device does not need to determine the receiving occasion by using other algorithms.

[0052] In an optional implementation, the method further includes: receiving capability information from the first terminal device, the capability information being used to indicate that the first terminal device has the capability of receiving the message used to prompt the first terminal device that there is incoming traffic or missed call. The terminal device can report the capability of the terminal device to the network device, so that the network device performs the corresponding procedure according to the capability of the terminal device.

[0053] In a fourth aspect, a fourth communication method is provided, which can be performed by a terminal device. The terminal device is, for example, a terminal device, or another device including a terminal device function, or a chip system (or chip) or another functional module, which can implement the function of the terminal device, and is, for example, arranged in the terminal device. Hereinafter, the terminal device is taken as an example of the terminal device. The method includes: receiving a fourth message in a first cell; in a case where the fourth message includes a first alarm identifier corresponding to a first terminal device, entering an RRC connected state, or outputting a prompt message, the prompt message being used to prompt the first terminal device that there is incoming traffic or missed call, wherein a number of bits occupied by the first alarm identifier is less than a number of bits occupied by an identifier of the first terminal device.

[0054] In an optional implementation, the method includes: receiving the first alarm identifier, and / or receiving information of a first area corresponding to the first alarm identifier.

[0055] In an optional implementation, the information of the first region comprises longitude and / or latitude of the first region, or the information of the first region comprises information of a geographical grid to which the first region belongs, or the information of the first region comprises information of one or more tracking areas included in the first region, or the information of the first region comprises information of one or more RAN area updates included in the first region, or the information of the first region comprises information of one or more cells included in the first region, or the information of the first region comprises beam information in one or more cells included in the first region.

[0056] In an optional implementation, the method further comprises: sending assistance information of the first terminal device, the assistance information being used for determining the first alarm identifier.

[0057] In an optional implementation, the assistance information of the first terminal device comprises one or more of the following: position information of the first terminal device; measurement information of the first terminal device; information indicating whether the first terminal device needs to receive a message prompting the first terminal device of arrival of service or missing of a called service; or power information, the power information being used for indicating a supplemental power of the first terminal device or a power level to which the supplemental power of the first terminal device belongs, wherein the supplemental power of the first terminal device is used for indicating a difference between a required receiving power of the first terminal device and an actual receiving power of the first terminal device.

[0058] In an optional implementation, the measurement information of the first terminal device comprises one or more of the following: a difference between a signal quality of the first terminal device when entering an RRC connected state this time and a signal quality after entering the RRC connected state this time; distribution information of signal quality of the first terminal device in a first time length in history; or a signal quality of the first terminal device before entering the RRC connected state this time.

[0059] In an optional implementation, the receiving the fourth message comprises: receiving the fourth message at a receiving occasion corresponding to the terminal device, the receiving occasion being determined according to a parameter related to the receiving occasion or being determined according to received information.

[0060] In an optional implementation, the method further comprises: sending capability information of the first terminal device, the capability information being used for indicating that the first terminal device has a capability of receiving a message prompting the first terminal device of arrival of service or missing of a called service.

[0061] As to the technical effects brought by the fourth aspect or the various optional implementations, reference can be made to the introduction of the technical effects of the third aspect or the corresponding implementation.

[0062] In a fifth aspect, a fifth communication method is provided, which can be performed by a network device. The network device is, for example, a network equipment, or other equipment including the function of the network equipment, or a chip system (or chip) or other functional module capable of implementing the function of the network equipment, which is, for example, arranged in the network equipment. The network equipment includes, for example, a core network equipment and / or an access network equipment. Hereinafter, the network device is taken as an example of the network equipment. The method includes: sending a fifth message, the fifth message being used to prompt a first terminal device that a service arrives or a called service is missed. Optionally, the fifth message is, for example, the first message or the second message in the foregoing aspects.

[0063] In an optional implementation, the fifth message includes a second identifier of the first terminal device, and the second identifier occupies a number of bits smaller than a number of bits occupied by the first identifier of the first terminal device.

[0064] In an optional implementation, the method further includes: determining the second identifier according to the first identifier, and the first information and / or the second information.

[0065] In an optional implementation, the second identifier includes all or part of bits in the first identifier except high M2 bits; or, the second identifier includes all or part of bits in the first identifier except high M2 bits, and further includes M3 bits, where a value of the M3 bits is a first value, the first value is used to indicate a core network device to which the first terminal device is registered, M2 and M3 are both positive integers, and M3 is smaller than M2; where the high M2 bits are used to carry an identifier of the core network device to which the first terminal device is registered.

[0066] In an optional implementation, the value of the M3 bits is used to indicate a core network device corresponding to the first cell, and the core network device to which the first terminal device is registered is one of the core network devices corresponding to the first cell; or, the value of the M3 bits is used to indicate a core network device corresponding to an access network device corresponding to the first cell, and the core network device to which the first terminal device is registered is one of the core network devices corresponding to the access network device corresponding to the first cell.

[0067] In an optional implementation, the M3 bits are located at a high bit or a low bit of the second identifier.

[0068] In an optional implementation, the method further includes: sending first information, the first information being used to indicate an association between a value of the M3-bit and a core network device corresponding to the first cell, or to indicate an association between the value of the M3-bit and a core network device corresponding to an access network device corresponding to the first cell.

[0069] In an optional implementation, the first information is information related to a core network device corresponding to the first cell, or is information related to a core network device corresponding to an access network device corresponding to the first cell, wherein the first information is used to determine M3, and the first cell is a cell in which the first terminal device is camped.

[0070] In an optional implementation, the second identifier includes part or all of bits in the first identifier except the low M1-bit.

[0071] In an optional implementation, the second information includes a parameter related to a reception occasion of the fifth message, wherein the second information is used to determine the M1.

[0072] In an optional implementation, the parameter related to the reception occasion of the fifth message includes: a number of reception frames included in a reception period of the fifth message, and / or a number of reception occasions corresponding to the first terminal device included in one reception frame; or, a number of reception occasions corresponding to the first terminal device included in the reception period of the fifth message.

[0073] In an optional implementation, M1 satisfies the following relationship: M1=(log2N+log2N s ), wherein N represents a number of reception frames included in the reception period, and N s represents a number of reception occasions corresponding to the first terminal device included in one reception frame.

[0074] In an optional implementation, M1 satisfies the following relationship: M1=(log2X), wherein X represents a number of reception occasions corresponding to the first terminal device included in the reception period.

[0075] In an optional implementation, the method further includes: sending the second information.

[0076] In an optional implementation, the method further comprises: receiving a first paging message from the core network device, the first paging message being used for paging the first terminal device, wherein the first paging message comprises the first identifier; or receiving a second message from the core network device, the second message being used for prompting the first terminal device of arrival of service or missing of a called service, wherein the second message comprises the first identifier.

[0077] In an optional implementation, the first paging message is further used for indicating that the first terminal device has a capability of receiving a message for prompting the first terminal device of arrival of service or missing of a called service; or the first paging message is further used for indicating that the first terminal device is sent a message for prompting the first terminal device of arrival of service or missing of a called service.

[0078] In an optional implementation, the method further comprises: receiving auxiliary information from the first terminal device; and determining one or more of the following according to the auxiliary information: the signal quality of the first terminal device is lower than a first threshold, the first terminal device is located at a cell edge, or the first terminal device tends to receive a message for prompting the first terminal device of arrival of service or missing of a called service.

[0079] In an optional implementation, the fifth message comprises a first alarm identifier corresponding to the first terminal device, and the first alarm identifier occupies a number of bits smaller than a number of bits occupied by the identifier of the first terminal device.

[0080] In an optional implementation, the first alarm identifier is determined according to auxiliary information of the first terminal device.

[0081] In an optional implementation, the auxiliary information of the first terminal device comprises one or more of the following: location information of the first terminal device; measurement information of the first terminal device; information indicating whether the first terminal device tends to receive a message for prompting the first terminal device of arrival of service or missing of a called service; or power information, the power information being used for indicating a supplemental power of the first terminal device or a power class to which the supplemental power of the first terminal device belongs, wherein the supplemental power of the first terminal device is used for indicating a difference between a required receiving power of the first terminal device and an actual receiving power of the first terminal device.

[0082] In an optional implementation, the measurement information of the first terminal device comprises one or more of the following: a difference between a signal quality of the first terminal device when entering the RRC connected mode this time and a signal quality after entering the RRC connected mode this time; distribution information of a signal quality of the first terminal device in a first time length in history; or a signal quality of the first terminal device before entering the RRC connected mode this time.

[0083] In an optional implementation, the first alarm identifier occupies a number of bits greater than or equal to log2K, K represents a number of terminal devices corresponding to the alarm identifier, K is determined according to the assistance information of the at least one terminal device, the K terminal devices include part or all of the at least one terminal device, the first terminal device belongs to the K terminal devices, and K is a positive integer.

[0084] In an optional implementation, the K terminal devices correspond to the same receiving occasion.

[0085] In an optional implementation, the method comprises: sending the first alarm identifier to the first terminal device, and / or sending information of a first area corresponding to the first alarm identifier.

[0086] In an optional implementation, the information of the first area comprises longitude and / or latitude of the first area, or the information of the first area comprises information of a geographical grid to which the first area belongs, or the information of the first area comprises information of one or more tracking areas included in the first area, or the information of the first area comprises information of one or more RAN area updates included in the first area, or the information of the first area comprises information of one or more cells included in the first area, or the information of the first area comprises beam information in one or more cells included in the first area.

[0087] In an optional implementation, the sending of the fifth message comprises: sending the fifth message at a receiving occasion corresponding to the terminal device, the receiving occasion being determined according to a parameter related to the receiving occasion or being configured according to alarm identifiers of K terminal devices, and the first terminal device belonging to the K terminal devices.

[0088] In an optional implementation, the method further comprises: receiving capability information from the first terminal device, the capability information being used to indicate that the first terminal device has the capability of receiving a message for prompting the first terminal device that there is an arrival of a service or a missing of a called service.

[0089] As to the technical effects brought by the fifth aspect or various optional embodiments, reference can be made to the introduction of the technical effects of any one of the aforementioned first to fourth aspects or corresponding embodiments.

[0090] In a sixth aspect, a sixth communication method is provided, which can be executed by a terminal device. The terminal device is, for example, a terminal device, or other equipment including the function of a terminal device, or a chip system (or, chip) or other functional module capable of realizing the function of a terminal device, which is, for example, arranged in a terminal device. Hereinafter, the terminal device is taken as an example of a terminal device. The method comprises: receiving a fifth message in a first cell, the fifth message being used to prompt a first terminal device that there is an arrival of service or a missed call service.

[0091] In an optional embodiment, the method further comprises: in the case that the fifth message comprises a second identifier of the first terminal device, entering an RRC connected state, or outputting a prompt message, the prompt message being used to prompt the first terminal device that there is an arrival of service or a missed call service, wherein the second identifier is determined according to the first identifier of the first terminal device, and the number of bits occupied by the second identifier is less than the number of bits occupied by the first identifier.

[0092] In an optional embodiment, the method further comprises: determining the second identifier according to the first identifier, and first information and / or second information.

[0093] In an optional embodiment, the second identifier comprises all or part of bits in the first identifier except for high M2 bits; or, the second identifier comprises all or part of bits in the first identifier except for high M2 bits, and further comprises M3 bits, wherein the value of the M3 bits is a first value, the first value is used to indicate a core network device registered by the first terminal device, M2 and M3 are both positive integers, and M3 is less than M2; wherein the high M2 bits are used to carry the identifier of the core network device registered by the first terminal device.

[0094] In an optional embodiment, the value of the M3 bits is used to indicate a core network device corresponding to the first cell, and the core network device registered by the first terminal device is one of the core network devices corresponding to the first cell; or, the value of the M3 bits is used to indicate a core network device corresponding to an access network device corresponding to the first cell, and the core network device registered by the first terminal device is one of the core network devices corresponding to the access network device corresponding to the first cell.

[0095] In an optional embodiment, the M3 bits are located at the high bits or low bits of the second identifier.

[0096] In an optional implementation, the method further includes: receiving first information, the first information being used to indicate an association between a value of the M3-bit and a core network device corresponding to the first cell, or an association between the value of the M3-bit and a core network device corresponding to an access network device corresponding to the first cell.

[0097] In an optional implementation, the first information is information related to a core network device corresponding to the first cell, or information related to a core network device corresponding to an access network device corresponding to the first cell, wherein the first information is used to determine M3.

[0098] In an optional implementation, the second identifier includes part or all of bits in the first identifier except the low M1-bit.

[0099] In an optional implementation, the second information includes a parameter related to a reception occasion of the first message, wherein the second information is used to determine the M1.

[0100] In an optional implementation, the parameter related to the reception occasion of the first message includes: a number of reception frames included in a reception period of the fifth message, and / or a number of reception occasions corresponding to the first terminal device included in one reception frame; or, a number of reception occasions corresponding to the first terminal device included in the reception period of the fifth message.

[0101] In an optional implementation, M1 satisfies the following relationship: M1=(log2N+log2N s ), wherein N represents a number of reception frames included in the reception period, and N s represents a number of reception occasions corresponding to the first terminal device included in one reception frame.

[0102] In an optional implementation, M1 satisfies the following relationship: M1=(log2X), wherein X represents a number of reception occasions corresponding to the first terminal device included in the reception period.

[0103] In an optional implementation, the method further includes: receiving the second information.

[0104] In an optional implementation, the method further includes: receiving a third message, the third message being used to prompt the first terminal device that a service arrives or a missed call service.

[0105] In an optional implementation, the method further includes: starting a timer after receiving the fifth message; entering the RRC connected state if the signal quality of the first terminal device is greater than a first threshold before the timer expires, otherwise, if the timer expires, recording a reason for failure to enter the RRC connected state.

[0106] In an optional implementation, the method further includes: sending auxiliary information, the auxiliary information being used to indicate one or more of the following: the signal quality of the first terminal device is lower than a first threshold, the first terminal device is located at a cell edge, or the first terminal device tends to receive a message prompting the terminal device of arrival of service or missing of a called service.

[0107] In an optional implementation, the method further includes: in a case where the fifth message includes a first alarm identifier corresponding to the first terminal device, entering the RRC connected state, or outputting a prompt message, the prompt message being used to prompt the first terminal device of arrival of service or missing of a called service, wherein a number of bits occupied by the first alarm identifier is less than a number of bits occupied by an identifier of the first terminal device.

[0108] In an optional implementation, the method includes: receiving the first alarm identifier, and / or receiving information of a first area corresponding to the first alarm identifier.

[0109] In an optional implementation, the information of the first area includes longitude and / or latitude of the first area, or the information of the first area includes information of a geographical grid to which the first area belongs, or the information of the first area includes information of one or more tracking areas included in the first area, or the information of the first area includes information of one or more RAN area updates included in the first area, or the information of the first area includes information of one or more cells included in the first area, or the information of the first area includes beam information in one or more cells included in the first area.

[0110] In an optional implementation, the method further includes: sending auxiliary information of the first terminal device, the auxiliary information being used to determine the first alarm identifier.

[0111] In an optional implementation, the assistance information of the first terminal device comprises one or more of the following: location information of the first terminal device; measurement information of the first terminal device; information indicating whether the first terminal device needs to receive a message prompting the first terminal device of arrival of service or missing of a called service; or, power information, the power information being used to indicate an additional power of the first terminal device or a power level to which the additional power of the first terminal device belongs, wherein the additional power of the first terminal device is used to indicate a difference between a required receiving power of the first terminal device and an actual receiving power of the first terminal device.

[0112] In an optional implementation, the measurement information of the first terminal device comprises one or more of the following: a difference between a signal quality when the first terminal device enters the RRC connected mode this time and a signal quality after the first terminal device enters the RRC connected mode this time; distribution information of a signal quality of the first terminal device in a first time length in history; or, a signal quality of the first terminal device before the first terminal device enters the RRC connected mode this time.

[0113] In an optional implementation, the receiving the fifth message comprises: receiving the fifth message at a receiving occasion corresponding to the terminal device, the receiving occasion being determined according to a parameter related to the receiving occasion or being determined according to the received information.

[0114] In an optional implementation, the method further comprises: sending capability information of the first terminal device, the capability information being used to indicate that the first terminal device has a capability of receiving a message prompting the first terminal device of arrival of service or missing of a called service.

[0115] As to the technical effects brought by the sixth aspect or various optional implementations, reference can be made to the introduction of the technical effects of any one of the first aspect to the fifth aspect or the corresponding implementation.

[0116] In a seventh aspect, a seventh communication method is provided, which can be performed by a network device. The network device is, for example, a network equipment, or other equipment including network equipment functions, or a chip system (or chip) or other functional module capable of implementing the functions of the network equipment, which is, for example, arranged in the network equipment. The network equipment includes, for example, a core network device and / or an access network device. Hereinafter, the network device is taken as an example. The method includes: determining a second identifier of a terminal device according to second information and / or a first identifier of the terminal device, wherein the second identifier occupies a number of bits less than or equal to a second threshold; and sending a first message, the first message being used for paging the terminal device or prompting the terminal device that there is incoming traffic or that a missed call, wherein the first message includes the second identifier.

[0117] In the embodiments of the present application, if the terminal device is in an RRC non-connected state, the network device can page the terminal device or prompt the terminal device that there is incoming traffic through the first message, so that the terminal device can start transmitting traffic after receiving the first message, thereby improving the success rate of traffic transmission. Or the network device can prompt the terminal device that there is a missed call through the first message, so that the terminal device can prompt the user of the missed call, thereby prompting the user to make a voice callback or message acquisition, and avoiding the user from missing important information. In addition, the first message can include the second identifier of the terminal device, and the second identifier occupies a number of bits less than or equal to the second threshold. The embodiments of the present application can save signaling overhead by reducing the length of the identifier, or the embodiments of the present application can carry more information through the unchanged length of the identifier. Optionally, since the first message has small overhead, it is more conducive to improving the coverage of the first message. For example, the network device can send the first message multiple times to achieve a better prompting effect on the terminal device.

[0118] In an optional implementation, the second identifier is the first identifier, wherein the length of the first identifier is shorter than the length of a P-TMSI of the terminal device; or the second identifier includes part of bits in the first identifier, wherein the second identifier occupies a number of bits shorter than the number of bits occupied by the first identifier; or the second identifier is allocated for the terminal device, and the length of the second identifier is determined according to the second information. For example, the first identifier is from the core network device, and the access network device can directly determine the first identifier as the second identifier, so that the access network device does not need to additionally determine the second identifier. Or the access network device can determine the second identifier according to the first identifier from the core network device, for example, by taking part of bits in the first identifier as the second identifier to reduce the length of the identifier. Or the access network device can also allocate the second identifier for the terminal device without referring to the first identifier.

[0119] In an optional implementation, the second identifier of different terminal devices in a same receiving occasion is different in a receiving period, and the second identifier of different terminal devices in different receiving occasions is the same or different. In a receiving occasion, the second identifier can be used to distinguish different terminal devices, and thus paging of the terminal device can be implemented through the second identifier.

[0120] In an optional implementation, the second information includes a parameter related to the receiving occasion of the first message. For example, the receiving occasion can be determined according to the second information, so as to receive the first message.

[0121] In an optional implementation, the parameter related to the receiving occasion of the first message includes a number of control channels used for sending the first message, and / or includes a number of receiving occasions in a receiving period.

[0122] In an optional implementation, the method further includes: determining the receiving occasion of the first message according to the second information and / or a third identifier of the terminal device. The third identifier includes, for example, an IMSI of the terminal device, or includes another identifier of the terminal device.

[0123] In an optional implementation, the method further includes: sending the second information. The network device can send the second information, and then the terminal device can determine the receiving occasion according to the second information.

[0124] An eighth aspect provides an eighth communication method, which can be executed by a terminal device. The terminal device is, for example, a terminal device, or is another device including a terminal device function, or is a chip system (or, a chip) or another functional module, which can implement a function of the terminal device, and is, for example, arranged in the terminal device. Hereinafter, the terminal device is taken as an example for description. The method includes: receiving a first message in a first cell; in a case where the first message includes a second identifier of the terminal device, entering an RRC connected state, or outputting a prompt message, the prompt message being used to prompt that there is a service arrival or a missed call service of the terminal device, wherein a number of bits occupied by the second identifier is less than a second threshold.

[0125] In an optional implementation, the second identifier includes part bits in a first identifier of the terminal device, and a number of bits occupied by the second identifier is less than a number of bits occupied by the first identifier; or, the second identifier is allocated to the terminal device.

[0126] In an optional implementation, the method further includes: receiving the second identifier; or determining the second identifier according to the first identifier of the terminal device; or determining the second identifier according to the second information and the first identifier of the terminal device.

[0127] In an optional implementation, the second information includes a parameter related to the receiving occasion of the first message.

[0128] In an optional implementation, the parameter related to the receiving occasion of the first message includes a number of control channels used for sending the first message, and / or includes a number of receiving occasions in a receiving period.

[0129] In an optional implementation, the method further includes: determining the receiving occasion of the first message according to the second information and / or a third identifier of the terminal device.

[0130] In an optional implementation, the method further includes: receiving the second information.

[0131] As to the technical effects brought by the eighth aspect or various optional implementations, refer to the introduction of the technical effects of the aforementioned seventh aspect or corresponding implementations.

[0132] In a ninth aspect, a communication apparatus is provided. The communication apparatus can be the network apparatus of any one of the first aspect to the eighth aspect. The communication apparatus has the functions of the network apparatus. The communication apparatus is, for example, a network device, or another device including the functions of the network device, or a chip system (or chip) or another functional module that can implement the functions of the network device, and the chip system or functional module is, for example, arranged in the network device. The network device includes, for example, a core network device and / or an access network device. In an optional implementation, the communication apparatus includes a baseband apparatus and a radio frequency apparatus. In another optional implementation, the communication apparatus includes a processing unit (also referred to as a processing module) and a transceiver unit (also referred to as a transceiver module). The transceiver unit can implement the sending function and the receiving function. When the transceiver unit implements the sending function, it can be referred to as a sending unit (also referred to as a sending module). When the transceiver unit implements the receiving function, it can be referred to as a receiving unit (also referred to as a receiving module). The sending unit and the receiving unit can be the same functional module, which is referred to as a transceiver unit and can implement the sending function and the receiving function. Alternatively, the sending unit and the receiving unit can be different functional modules, and the transceiver unit refers to these functional modules in general.

[0133] In an optional implementation, the processing unit is configured to determine the second identifier of the terminal device according to the first identifier of the terminal device, and the second identifier occupies a number of bits less than a number of bits occupied by the first identifier; and the transceiver unit (or the sending unit) is configured to send a first message, the first message being used for paging the terminal device or being used for prompting the terminal device that there is incoming service or that a missed call service is missed, wherein the first message comprises the second identifier.

[0134] In an optional implementation, the transceiver unit (or the sending unit) is configured to send a fourth message, the fourth message being used for paging the first terminal device or being used for prompting the first terminal device that there is incoming service or that a missed call service is missed, wherein the fourth message comprises a first alarm identifier corresponding to the first terminal device, and the first alarm identifier occupies a number of bits less than a number of bits occupied by an identifier of the first terminal device.

[0135] In an optional implementation, the transceiver unit (or the sending unit) is configured to send a fifth message, the fifth message being used for prompting the first terminal device that there is incoming service or that a missed call service is missed.

[0136] In an optional implementation, the processing unit is configured to determine the second identifier of the terminal device according to the second information and / or the first identifier of the terminal device, and the second identifier occupies a number of bits less than or equal to a second threshold; and the transceiver unit (or the sending unit) is configured to send a first message, the first message being used for paging the terminal device or being used for prompting the terminal device that there is incoming service or that a missed call service is missed, wherein the first message comprises the second identifier.

[0137] In an optional implementation, the communication apparatus further comprises a storage unit (also referred to as a storage module), and the processing unit is coupled to the storage unit and is enabled to execute a program or an instruction in the storage unit, so that the communication apparatus is enabled to perform the functions of the network apparatus in any one of the first aspect to the eighth aspect.

[0138] In a tenth aspect, a communication apparatus is provided. The communication apparatus can be the terminal device of any one of the first aspect to the eighth aspect. The communication apparatus has the functions of the terminal device. The communication apparatus is, for example, a terminal device, or another device including the functions of the terminal device, or a chip system (or, chip) or another functional module capable of implementing the functions of the terminal device, which is, for example, arranged in the terminal device. In an optional implementation manner, the communication apparatus includes a baseband device and a radio frequency device. In another optional implementation manner, the communication apparatus includes a processing unit (also referred to as a processing module) and a transceiver unit (also referred to as a transceiver module). For implementation manners of the transceiver unit, refer to the related description of the ninth aspect.

[0139] In an optional implementation manner, the transceiver unit (or, the receiving unit) is configured to receive a first message in the first cell; and the processing unit is configured to, in a case where the first message includes a second identifier of the terminal device, enter the RRC connected state, or output a prompt message, the prompt message being used to prompt the terminal device that there is an incoming service or a missed call service, wherein the second identifier is determined according to the first identifier of the terminal device, and a number of bits occupied by the second identifier is less than a number of bits occupied by the first identifier.

[0140] In an optional implementation manner, the transceiver unit (or, the receiving unit) is configured to receive a fourth message in the first cell; and the processing unit is configured to, in a case where the fourth message includes a first alarm identifier corresponding to the first terminal device, enter the RRC connected state, or output a prompt message, the prompt message being used to prompt the first terminal device that there is an incoming service or a missed call service, wherein a number of bits occupied by the first alarm identifier is less than a number of bits occupied by an identifier of the first terminal device.

[0141] In an optional implementation manner, the transceiver unit (or, the receiving unit) is configured to receive a fifth message in the first cell, the fifth message being used to prompt the first terminal device that there is an incoming service or a missed call service.

[0142] In an optional implementation manner, the transceiver unit (or, the receiving unit) is configured to receive a first message in the first cell; and the processing unit is configured to, in a case where the first message includes a second identifier of the terminal device, enter the RRC connected state, or output a prompt message, the prompt message being used to prompt the terminal device that there is an incoming service or a missed call service, wherein a number of bits occupied by the second identifier is less than a second threshold.

[0143] In an optional implementation, the communication apparatus further includes a storage unit (also referred to as a storage module), and the processing unit is coupled to the storage unit and executes programs or instructions in the storage unit to enable the communication apparatus to perform the functions of the terminal apparatus in any of the first aspect to the eighth aspect.

[0144] In an eleventh aspect, a communication apparatus is provided, which can be the network apparatus in any of the first aspect to the eighth aspect. The communication apparatus has the functions of the network apparatus. The communication apparatus is, for example, a network device, or other device including the functions of the network device, or a chip system (or chip) or other functional module that can implement the functions of the network device, for example, in the network device. The communication apparatus includes a processor configured to perform the functions of the network apparatus in any of the first aspect to the eighth aspect. Optionally, the communication apparatus further includes a memory. The memory is configured to store a computer program, and the processor is coupled to the memory. When the processor reads the computer program or instructions, the communication apparatus performs the method performed by the network apparatus in the aspects.

[0145] In a twelfth aspect, a communication apparatus is provided, which can be the terminal apparatus in any of the first aspect to the eighth aspect. The communication apparatus has the functions of the terminal apparatus. The communication apparatus is, for example, a terminal device, or other device including the functions of the terminal device, or a chip system (or chip) or other functional module that can implement the functions of the terminal device, for example, in the terminal device. The communication apparatus includes a processor configured to perform the functions of the terminal apparatus in any of the first aspect to the eighth aspect. Optionally, the communication apparatus further includes a memory. The memory is configured to store a computer program, and the processor is coupled to the memory. When the processor reads the computer program or instructions, the communication apparatus performs the method performed by the terminal apparatus in the aspects.

[0146] In a thirteenth aspect, a communication system is provided, which includes a terminal apparatus and a network apparatus. The network apparatus is configured to perform the method performed by the network apparatus in any of the first aspect to the eighth aspect, and the terminal apparatus is configured to perform the method performed by the terminal apparatus in any of the first aspect to the eighth aspect. For example, the network apparatus can be implemented by the communication apparatus in the ninth aspect or the eleventh aspect, and the terminal apparatus can be implemented by the communication apparatus in the tenth aspect or the twelfth aspect. Optionally, the communication system can further include other apparatuses, which are not limited.

[0147] In a fourteenth aspect, a computer-readable storage medium is provided for storing a computer program or instructions, which, when executed by a computer, cause the method performed by the terminal device or the network device in any of the aspects above to be implemented.

[0148] In a fifteenth aspect, a computer program product is provided, which contains instructions, which, when executed by a computer, cause the method in any of the aspects above to be implemented.

[0149] In a sixteenth aspect, a chip system is provided, which includes a processor and an interface, the processor being configured to invoke and execute instructions from the interface, so that the chip system implements the method in any of the aspects above. BRIEF DESCRIPTION OF DRAWINGS

[0150] FIGS. 1A-1D are schematic diagrams of several application scenarios of embodiments of the present application;

[0151] FIGS. 2-5 are flowcharts of several communication methods provided by embodiments of the present application;

[0152] FIG. 6 is a schematic diagram of an apparatus provided by an embodiment of the present application;

[0153] FIG. 7 is a schematic diagram of another apparatus provided by an embodiment of the present application. DETAILED DESCRIPTION

[0154] In order to make the purposes, technical solutions and advantages of embodiments of the present application clearer, the following will further describe the embodiments of the present application in conjunction with the drawings.

[0155] In the embodiments of the present application, the number of a noun, unless otherwise specified, represents "a singular noun or a plural noun", i.e., "one or more". "At least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following cases: A exists alone, A and B exist together, B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. For example, A / B means A or B. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c means 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.

[0156] The ordinal numbers such as "first", "second", and the like mentioned in the embodiments of the present application are used to distinguish a plurality of objects, and are not used to limit the size, content, order, time sequence, priority, or importance of the plurality of objects. In addition, the numbering of steps in each embodiment introduced in the present application is only to distinguish different steps, and is not used to limit the order of the steps. For example, S201 can occur before S202, or can occur after S202, or can occur simultaneously with S202.

[0157] In the following, some terms or concepts in the embodiments of the present application are explained and described, so as to facilitate the understanding of those skilled in the art.

[0158] In the embodiments of the present application, the terminal device is a device with wireless transceiving function, which can be a fixed device, a mobile device, a handheld device (for example, a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device (for example, a communication module, a modem, or a chip system, etc.) built in the above devices. The terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, for example, including but not limited to the following scenarios: sensing scenarios, cellular communication, device-to-device (D2D) communication, vehicle to everything (V2X) communication, machine-to-machine / machine-type communications (M2M / MTC), internet of things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self driving, remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, unmanned aerial vehicle, robot, indoor commercial scenarios (such as mobile phone screen projection, file sharing, mobile phone to VR glasses video transmission), satellite communication, etc. When the terminal device is applied to V2X, it can also be referred to as a V2X device, for example, a smart car, a digital car, an unmanned car, a self-driving car, a pure EV, a hybrid electric vehicle (HEV), a range extended EV (REEV), a plug-in HEV (PHEV), a new energy vehicle, a road site unit (RSU), etc. The terminal device can also be a device in D2D communication, for example, a water meter, a gas meter, etc.

[0159] In addition, in the embodiments of the present application, the terminal device can also be a terminal device in an internet of things (IoT) system. The IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection.

[0160] As introduced above, various terminal devices can be considered as on-board terminal devices if they are located on a vehicle (for example, placed in or installed in a vehicle), and the on-board terminal device is also referred to as an on-board unit (OBU). The terminal device of the present application can also be an on-board module, an on-board module group, an on-board component, an on-board chip or an on-board unit built in a vehicle as one or more components or units, and the vehicle can implement the method of the present application through the built-in on-board module, on-board module group, on-board component, on-board chip or on-board unit.

[0161] The terminal device can also be referred to as a UE, a terminal, an access station, a UE station, a remote station, a wireless communication device, or a user device, etc.

[0162] In the embodiments of the present application, the communication device for implementing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system, which can be installed in the terminal device. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the terminal device is taken as an example to describe the technical solutions provided in the embodiments of the present application. In addition, for the convenience of description, the terminal device is taken as an example to illustrate the embodiments of the present application.

[0163] The network device in the embodiments of the present application, for example, includes an access network device and / or a core network device. The access network device is a device with wireless transceiving function, used for communicating with the terminal device. The access network device includes, but is not limited to, a base station (base transceiver station (BTS), Node B, evolved Node B (eNodeB) / eNB, or the next generation Node B (gNodeB) / gNB), a transmission reception point (TRP), a base station evolved from the 3rd generation partnership project (3GPP), an access node in a wireless fidelity (Wi-Fi) system, a wireless relay node, a wireless backhaul node, and the like. The base station can be a macro base station, a micro base station, a pico base station, a small station, a relay station, a base station on a satellite, a satellite ground station, and the like. Multiple base stations can support a network of the same access technology or a network of different access technologies. A base station can include one or more co-sited or non-co-sited transmission reception points. The access network device can also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The access network device can also be a server and the like. For example, the network device in the V2X technology can be a road side unit (RSU). The following describes the access network device by taking a base station as an example. The base station can communicate with the terminal device or communicate with the terminal device through a relay station. The terminal device can communicate with multiple base stations in different access technologies. The core network device is used to implement mobile management, data processing, session management, policy and charging, and the like. The names of devices implementing core network functions in systems of different access technologies can be different, and the embodiments of the present application do not limit this. Taking the 5th generation (5G) system as an example, the core network device includes, for example, an access and mobility management function (AMF), a session management function (SMF), a policy control function (PCF), a user plane function (UPF), and the like.

[0164] In the CU-DU architecture, the network device can include one or more of a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), and the like. The CU and the DU can be separately arranged or 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 unit (AAU), or a remote radio head (RRH).

[0165] 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 an open RAN (ORAN) system, the CU can also be referred to as an open CU (O-CU), the DU can also be referred to as an open DU (O-DU), the CU-CP can also be referred to as an open CU-CP (O-CU-CP), the CU-UP can also be referred to as an open CU-UP (O-CU-UP), and the RU can also be referred to as an open RU (O-RU). For the convenience of description, the CU, CU-CP, CU-UP, DU, and RU are taken as examples for description in the embodiments of the present application. Any of the CU (or CU-CP, CU-UP), DU, and RU in the embodiments of the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0166] Optionally, in various embodiments of the present application, if the network device is a distributed architecture, for example, the network device includes a CU and a DU, or includes a CU-CP, a CU-UP, and a DU, the network device sends information to the UE, and specifically, the DU included in the network device can send information to the UE; the network device receives information from the UE, and specifically, the DU included in the network device can receive information from the UE.

[0167] In the embodiments of the present application, the communication device for implementing the function of the network device can be a network device, or a device capable of supporting the network device to implement the function, such as a chip system, which can be installed in the network device. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the network device is taken as an example (for example, the device for implementing the function of the access network device is taken as the access network device, and the device for implementing the function of the core network device is taken as the core network device), and the technical solutions provided in the embodiments of the present application are described.

[0168] In short, in the embodiments of the present application, if the UE is in the RRC non-connected state, the network device can page the UE or prompt the UE that there is traffic arrival or missed call service through the first message, so that the UE can start to transmit traffic after receiving the first message, thereby improving the success rate of traffic transmission. In addition, the first message can include the second identifier of the UE, and the number of bits occupied by the second identifier can be less than the number of bits occupied by the first identifier of the UE, which is equivalent to reducing the length of the identifier in the embodiments of the present application, thereby saving signaling overhead. Optionally, since the overhead of the first message is small, it is more conducive to improving the coverage of the first message. For example, the network device can send the first message multiple times to achieve a better effect of prompting the UE.

[0169] The technical solutions provided in the embodiments of the present application can also be applied to the GSM system, or the GMR system, or the 4G system, such as the long term evolution (LTE) system, or can be applied to the 5G system, such as the new radio (NR) system, or can also be applied to the next generation mobile communication system or other similar communication systems, such as the 6G system, and the like, without limitation. In addition, the technical solutions provided in the embodiments of the present application can also be applied to the D2D scenario, such as the NR-D2D scenario, or applied to the V2X scenario, such as the NR-V2X scenario. For example, the embodiments of the present application can be used in the fields of factory manufacturing, whole-house intelligence, intelligent driving, assisted driving, intelligent networked vehicles, or indoor commercial scenarios, and the like.

[0170] Please refer to FIG. 1A-1D, which are schematic diagrams of several application scenarios of embodiments of the present application. FIG. 1A-1C are satellite communication scenarios, and FIG. 1D is a cellular communication scenario. According to the deployment scenario of the satellite and the ground network, the satellite network architecture can be divided into three categories: transparent satellite architecture, satellite backhaul architecture, and regenerative satellite architecture. The architecture in which the UE connects to the ground access network through the satellite can be referred to as transparent satellite architecture (for example, FIG. 1A), the architecture in which the UE connects to the ground network through the satellite after connecting to the ground access network can be referred to as satellite backhaul architecture (for example, FIG. 1B), and the architecture in which the access network device is arranged on the satellite (or the satellite has the function of the access network device) can be referred to as regenerative satellite architecture (for example, FIG. 1C).

[0171] In FIG. 1A, the network devices (such as access network devices and / or core network devices, etc.) for transmitting services are all located on the ground, the UE accesses the network by accessing the access network device located on the ground through the satellite, and the satellite has a transparent function.

[0172] In FIG. 1B, the access network device is located on the ground, the UE communicates with the satellite through the access network on the ground, and then connects to the ground network through the satellite.

[0173] In FIG. 1C, the access network device is arranged on the satellite, or the bottom layer processing module of the access network device is arranged on the satellite, or the satellite has part or all of the functions of the access network device. In addition to the access network device, other network devices (such as core network devices, etc.) for transmitting services are located on the ground. Alternatively, part or all of the devices in the core network can also be arranged on the satellite, or the satellite can have the function of part or all of the devices in the core network.

[0174] In FIG. 1D, the core network device and the access network device located on the ground serve the UE.

[0175] The method provided by the embodiments of the present application will be described below with reference to the accompanying drawings. In the corresponding drawings of various embodiments of the present application, the steps indicated by the dashed lines are optional steps. The various embodiments of the present application can be applied to the network architecture shown in any one of FIG. 1A-1D. For example, the UE described in the various embodiments of the present application can be the UE shown in any one of FIG. 1A-1D, the network device described in the various embodiments of the present application can be the access network device and / or core network device shown in any one of FIG. 1A-1D, the access network device described in the various embodiments of the present application can be the core network device shown in any one of FIG. 1A-1D, and the access network device described in the various embodiments of the present application can be the core network device shown in any one of FIG. 1A-1D.

[0176] The embodiments of the present application provide a communication method, please refer to FIG. 2, which is a flowchart of the method.

[0177] S201, the core network device sends a first paging message to the access network device. Correspondingly, the access network device receives the first paging message. The first paging message can be used to page the UE, and the first paging message includes a first identifier of the UE. The UE can also be referred to as a first UE.

[0178] The first identifier of the first UE includes one or more of the following, for example: a 5G-system (S)-temporary mobile subscription identifier (TMSI) of the first UE, an international mobile subscriber identity (IMSI) of the first UE, a TMSI of the first UE, a paging (P)-TMSI of the first UE, a group radio network temporary identifier (G-RNTI) of the first UE, or an identifier allocated by the core network device to the first UE according to corresponding information (for example, second information to be introduced later). Alternatively, the first identifier of the first UE can also include other identifiers of the first UE. If the first identifier of the first UE is an identifier allocated by the core network device to the first UE, optionally, the length of the first identifier can be shorter than that of the P-TMSI or G-RNTI of the first UE, and this will be introduced in the embodiment shown in FIG. 5 later. The paging procedure is a core network paging procedure, for example, and the first UE can be in an RRC non-connected state, for example, in an RRC idle state.

[0179] The core network device involved in the embodiments of the present application can be an AMF, or a mobile management entity (MME), or a mobile switching center (MCS), or a serving GPRS support node (SGSN), or other devices in the core network.

[0180] S201 is an optional step. For example, the access network device can also determine the second identifier by itself and send the first message to be introduced later.

[0181] S202, the access network device determines a second identifier of the first UE according to the first identifier.

[0182] The second identifier occupies a smaller number of bits than the first identifier, or the length of the second identifier is smaller than the length of the first identifier, or the information amount of the second identifier is smaller than the information amount of the first identifier.

[0183] For example, the first identifier is a 5G-S-TMSI of the first UE, where the 5G-S-TMSI can be allocated by a core network device (for example, an AMF) in a process in which the first UE registers to the core network device, or can be allocated by the core network device after the first UE sends a service request message to the core network device. The 5G-S-TMSI occupies a large number of bits, for example, 48 bits, and if the air interface signaling includes the 5G-S-TMSI, the signaling overhead is large. For example, for a satellite communication scenario, the communication resources can be limited, and there can be insufficient resources to transmit the air interface signaling, or other signals can not have sufficient resources to be transmitted due to the large amount of resources occupied by the air interface signaling. Therefore, in the embodiments of the present application, the access network device can determine the second identifier, so that the access network device can carry the second identifier when sending the paging message. The length of the second identifier is smaller than the length of the first identifier, and the transmission overhead of the second identifier is smaller than the transmission overhead of the first identifier, thereby reducing the transmission overhead of the air interface signaling to save transmission resources. Optionally, since the first message has a small overhead, it is more conducive to improving the coverage of the first message, for example, the access network device can send the paging message multiple times to achieve better paging of the UE.

[0184] Optionally, the access network device can determine the second identifier according to the first identifier, and the first information and / or the second information. The first information and / or the second information can be included in the configuration information of the first cell, or can also be included in other information. The first cell is a cell in which the access network device pages the first UE, for example, the access network device can send a paging message for paging the first UE in the first cell, which will be described later.

[0185] In an optional implementation, the first information can include information related to a core network device corresponding to the first cell, or the first information can include information related to a core network device corresponding to the access network device corresponding to the first cell. The core network device is, for example, an AMF. One cell can be served by one or more AMFs, and the AMF corresponding to the first cell can refer to an AMF serving the first cell. For example, the first information includes an identifier of the AMF serving the first cell, or the first information can indicate the number of AMFs serving the first cell.

[0186] A cell is served by an access network device, so it can also be considered that one access network device can be served by one or more AMFs. The access network device corresponding to the first cell refers to the access network device serving the first cell, or refers to the access network device providing the first cell. The AMF corresponding to the access network device can refer to the AMF serving the access network device. Among them, the AMF serving any cell provided by the access network device can be considered as the AMF serving the access network device. For example, the first information includes the identifier of the AMF serving the access network device, or the first information can indicate the number of AMFs serving the access network device.

[0187] For example, the access network device can determine the number of AMFs corresponding to the first cell according to the first information, or determine the number of AMFs corresponding to the access network device corresponding to the first cell according to the first information. According to the number, the access network device can determine the second identifier.

[0188] As an optional implementation of the second identifier, the second identifier can include all or part of the bits in the first identifier except the high M2 bits, or the second identifier can not include the high M2 bits in the first identifier, M2 is a positive integer. Optionally, the high M2 bits in the 5G-S-TMSI of the first UE can carry the identifier of the core network device registered by the first UE, for example, the AMF. It can be understood that the high M2 bits in the 5G-S-TMSI of the first UE can indicate the AMF registered by the first UE. M2 is 16, for example, or it can also be other values. And the AMF registered by the first UE is one of the AMFs corresponding to the first cell, or one of the AMFs corresponding to the access network device corresponding to the first cell. For example, the access network device can determine that the number of AMFs corresponding to the first cell is 1 according to the first information, which indicates that the first cell corresponds to one AMF; or the access network device can determine that the number of AMFs corresponding to the access network device corresponding to the first cell is 1 according to the first information, which indicates that the access network device corresponding to the first cell corresponds to one AMF. In this case, even if the UE is not indicated the AMF registered by the UE, or the AMF currently initiating the paging, the UE can also determine the corresponding AMF. Therefore, the second identifier can include all or part of the bits in the first identifier except the high M2 bits, for example, the access network device can remove the high M2 bits from the first identifier, so that the second identifier can include all or part of the bits in the first identifier except the high M2 bits. In this case, the number of bits included in the second identifier can be reduced by at least M2 bits compared with the number of bits included in the first identifier, so the transmission overhead of the second identifier is smaller.

[0189] For example, the access network device determines, according to the first information, that the number of AMFs corresponding to the first cell is not 1, which indicates that the first cell corresponds to multiple AMFs; or the access network device determines, according to the first information, that the number of AMFs corresponding to the access network device corresponding to the first cell is not 1, which indicates that the access network device corresponding to the first cell corresponds to multiple AMFs. In this case, the second identifier can be used to indicate the AMF to which the first UE is registered, or the AMF that initiates the paging currently. Therefore, as another optional implementation of the second identifier, the second identifier can include all or part of the bits in the first identifier except the high M2 bits, or the second identifier can not include the high M2 bits in the first identifier; in addition, the second identifier can further include M3 bits. For example, the access network device can remove the high M2 bits from the first identifier, so that the second identifier includes all or part of the bits in the first identifier except the high M2 bits; in addition, the access network device can add M3 bits to the first identifier from which the high M2 bits are removed, so as to obtain the second identifier. M3 is less than M2.

[0190] wherein M3 is a positive integer, and the M3 bits can be located at a high bit or a low bit of the second identifier. The M3 bits can indicate the AMF corresponding to the first cell, or indicate the AMF corresponding to the access network device corresponding to the first cell. For example, different values of the M3 bits can indicate different AMFs, and when the M3 bits are a first value, the AMF to which the first UE is registered can be indicated. Therefore, the first UE can determine the AMF according to the value of the M3 bits. Optionally, M3 can be determined according to the number of AMFs corresponding to the first cell, or according to the number of AMFs corresponding to the access network device corresponding to the first cell. For example, M3=log2Y, Y represents the number of AMFs corresponding to the first cell, or represents the number of AMFs corresponding to the access network device corresponding to the first cell, and Y is a positive integer. For example, Y=4, and M3 can be 2, that is, 2 bits can be used to indicate 4 AMFs. It can be seen that, compared with M2, M3 has a smaller value, which is equivalent to reducing the number of bits of the first identifier to save transmission overhead.

[0191] In an optional implementation, the second information can comprise a parameter related to the reception occasion of the first message. Optionally, the parameter related to the reception occasion of the first message comprised in the second information can comprise a number of reception frames included in a reception period of the first message, and / or a number of reception occasions corresponding to the first UE included in one reception frame. Alternatively, the parameter related to the reception occasion of the first message comprised in the second information can comprise a number of reception occasions corresponding to the first UE included in a reception period of the first message. Wherein the first message will be introduced in the following steps, the first message in the embodiments of the present application can be used to page the first UE, for example, the first message is a paging message. Therefore, the reception occasion of the first message can be a paging occasion (PO), and the reception period of the first message can be a paging period, and the reception frame can refer to a paging frame (PF).

[0192] Alternatively, the parameter related to the reception occasion of the first message comprised in the second information can comprise a number (e.g., a total number) of reception occasions in one reception period, and / or a number (e.g., a total number) of control channels used for transmitting the first message. Wherein one reception occasion can also be regarded as one reception group (e.g., a paging group), and the number of reception occasions in one reception period can also be regarded as the number of paging groups in one reception occasion.

[0193] Wherein the network device can group the UEs, so that different UEs only need to wake up to listen to the signals on the corresponding resource positions at the reception occasion of the UE, without having to wake up to listen to the signals at the reception occasion of other UEs. For example, the first UE can determine the reception occasion corresponding to the first UE according to the configuration information of the network device and the identifier of the first UE, etc. Wherein the configuration information of the network device can comprise the second information. The identifier of the first UE can comprise the first identifier described above. The purpose of the first message is to let the corresponding UE know that the UE is paged, and the grouping of the UEs by the network device has already distinguished the UEs between different groups, so when paging the UEs using the second identifier, it is only necessary to distinguish the UEs within the same group, without having to distinguish the UEs between different groups. It can be understood that, since the reception occasion of the first message provides a distinction in the time domain and / or the frequency domain, the number of UEs that need to be distinguished at each reception occasion is reduced, thereby reducing the length of the identifier carried by the first message, for example, from the length of the first identifier to the length of the second identifier, without affecting the function of sending the identifier of the UE by the first message.

[0194] For example, the access network device can determine a parameter related to the receiving occasion of the first message according to the second information. According to the parameter, the access network device can determine the second identity. As an optional implementation of the second identity, the second identity can include part or all of the bits in the first identity except the low M1 bits, or the second identity can not include the low M1 bits in the first identity, where M1 is a positive integer.

[0195] The first UE can determine a PO before receiving the paging message. As an optional implementation of the first UE determining the PO, the first UE can determine a system frame number (SFN) and a first index, where the SFN represents a frame number of a system frame including the PO corresponding to the first UE, and the first index represents an index of the PO corresponding to the first UE in the SFN, so that the first UE determines the PO corresponding to the first UE, and then the first UE can listen to the paging in the PO. For example, the SFN satisfies the following relationship: (SFN+PF offset )mod T=(T div N)×(UE_ID mod N) (Formula 1)

[0196] In Formula 1, PF offset represents an offset of the PF. T represents a paging cycle, where T is a smaller value of a default DRX cycle and a UE specific DRX cycle. N represents a total number of PFs included in one paging cycle. UE_ID represents an identity of the first UE, where if the first UE supports extended discontinuous reception (eDRX), UE_ID=(5G-S-TMSI)mod 4096, otherwise, UE_ID=(5G-S-TMSI)mod 1024. mod represents a modulo operation, and div represents an integer division operation. In Formula 1, N and PF offset are cell-level parameters that can be broadcast through a system message (for example, a system information block (SIB) 1), and T is determined by the first UE, so that the first UE can determine the SFN according to Formula 1.

[0197] In addition, the first index satisfies the following relationship, for example: i s =floor(UE_ID / N)mod N s (Formula 2)

[0198] In Formula 2, i s represents the first index, and N sdenotes the total number of POs included in a PF, and floor denotes a down rounding operation. The first UE can determine the first index according to Formula 2.

[0199] Correspondingly, the access network device can also determine the PO corresponding to the UE to be paged in the same or similar manner as the UE. According to the above formula, it can be seen that the information used by the UE to determine the PO corresponding to the UE is mainly the low bit of the 5G-S-TMSI. For example, for a UE not configured with eDRX, the UE_ID participating in the calculation of Formula 1 or Formula 2 is (5G-S-TMSI) mod 1024, that is, the low 10 bits of the 5G-S-TMSI of the UE. It can be understood that the network groups the UEs based on UE_ID, and the UEs with the same low bits of the corresponding 5G-S-TMSI are grouped into the same group, and the UEs of one group correspond to the same PO. Or it can be understood that the UEs corresponding to the same PO have the same low bits of the corresponding 5G-S-TMSI, and the number of bits that are the same can depend on the configuration of the network. For example, T = 2.56 seconds, N = 32, N s = 2, which means that the UEs with the same low 5 bits of the 5G-S-TMSI correspond to the same PF, and the UEs with the same low 6 bits of the 5G-S-TMSI correspond to the same PO. Therefore, the embodiments of the present application consider that in one PO, the high bits of the 5G-S-TMSI can be used to distinguish between UEs, and the low bits of the 5G-S-TMSI cannot be used to distinguish between different UEs in one PO. The purpose of the paging message is to let the UE know that the UE is paged, that is, the paging message needs to distinguish between different UEs, but the low bits of the 5G-S-TMSI cannot distinguish between different UEs, for example, the low M1 bits of the 5G-S-TMSI of different UEs are the same in the same PO. Therefore, the embodiments of the present application consider that the low bits of the 5G-S-TMSI in the paging message are redundant information. Therefore, the embodiments of the present application can remove the low M1 bits from the first identifier, and the second identifier can include all the bits of the first identifier except the low M1 bits. In this way, the overhead of the first identifier can be reduced, and the function of the first identifier (or the second identifier) is not affected.

[0200] Optionally, M1 can satisfy the following relationship: M1 = (log2N + log2N s ) (Formula 3)

[0201] Under Formula 3, it can be considered that the second information includes parameters related to the reception occasion of the first message, including the number N of reception frames included in the reception period of the first message, and / or the number N s of reception occasions corresponding to the first UE included in a reception frame.

[0202] Alternatively, M1 can satisfy the following relationship: M1 = (log2X) (Equation 4)

[0203] Under Equation 4, it can be considered that the parameter related to the reception occasion of the first message included in the second information includes the number of reception occasions included in the reception period of the first message, which is equal to N x N, for example s .

[0204] As another optional implementation of the first UE determining the PO, the first UE can determine the PO according to the first identity (e.g., IMSI) of the first UE and / or the second information (e.g., the number of control channels and / or the number of paging groups indicated by the second information, etc.). For example, the first UE can determine the frequency domain information and / or the time domain information corresponding to the PO according to the first identity of the first UE and / or the second information, which is equivalent to determining the PO corresponding to the first UE. Wherein, the frequency domain information corresponding to the PO includes the index of the control channel corresponding to the PO, for example, and the time domain information corresponding to the PO includes the index of the paging group corresponding to the PO (e.g., the paging group is considered as the PO, and the index of the paging group is also the index of the PO), which is equivalent to determining the PO corresponding to the first UE. Wherein, the control channel corresponding to the PO is a common control channel (CCCH), for example.

[0205] Optionally, the first UE uses (IMSI mod 1000) as the UE_ID of the first UE, and according to the following relationship, the first UE can determine the frequency domain information of the PO corresponding to the first UE, which can include the index of the CCCH. CCCH index = (UE_ID mod (number of control channels x number of paging groups)) / number of paging groups (Equation 5)

[0206] Wherein, the number of paging groups = max (the number of normal paging groups N, the number of enhanced paging groups M). M and / or N are indicated by the second information, for example. Wherein, max (a, b) represents taking the larger value of a and b, and mod represents the modulo operation.

[0207] The first UE can determine the time domain information of the PO for the normal paging and the enhanced paging at the CCCH index. For example, the first UE can determine the time domain information of the PO corresponding to the normal paging by UE_ID mod N, where N represents the number of the configured normal paging groups (e.g., the normal paging groups can be understood as the normal POs if the POs are regarded as the paging groups); the first UE can determine the time domain information of the PO corresponding to the enhanced paging by UE_ID mod M, where M represents the number of the configured enhanced paging groups (e.g., the enhanced paging groups can be understood as the enhanced POs if the POs are regarded as the paging groups). Thus, the first UE can determine the time domain information of the PO corresponding to the first UE, and the time domain information can include the index of the paging group (e.g., the PO) that the first UE needs to monitor.

[0208] When the access network device sends the first message (e.g., the paging message or the enhanced paging message), the PO for sending the first message can be determined according to the first identifier, and thus the first message is sent at the PO. The first message can include the second identifier of the UE to be paged (e.g., including the second identifier of the first UE). The length of the second identifier of one UE can be shorter than the length of the first identifier of the UE, and the second identifiers corresponding to the UEs in one group grouped based on the first identifier can not overlap, but the second identifiers corresponding to the UEs in different groups grouped based on the first identifier can overlap, so that the UEs in each PO can be uniquely distinguished. Compared with the manner of carrying the first identifier in the first message, the length of the UE identifier carried in the first message can be shortened in the embodiment of the present application.

[0209] It is introduced in the foregoing that the access network device can determine the second identifier according to the first identifier, and the first information and / or the second information, that is, the foregoing manner for determining the second identifier can be applied separately, for example, the access network device can determine the second identifier according to the first identifier and the first information, or determine the second identifier according to the first identifier and the second information; or the foregoing manner for determining the second identifier can also be applied in combination, for example, the access network device can determine the second identifier according to the first identifier, the first information, and the second information. The foregoing has introduced the scheme of separate application of these manners, if the foregoing manners are applied in combination, the second identifier determined by the access network device can meet both the first information and the second information. For example, the second identifier can include all or part of the bits in the first identifier except the high M2 bits and except the low M1 bits, or the second identifier can not include the high M2 bits and the low M1 bits in the first identifier. For another example, the second identifier can include all or part of the bits in the first identifier except the high M2 bits and except the low M1 bits, and can also include M3 bits; or the second identifier can not include the high M2 bits and the low M1 bits in the first identifier, and can also include M3 bits.

[0210] Optionally, the access network device can decide whether to determine the second identifier. As a decision manner of the access network device, the access network device can decide whether to determine the second identifier according to the assistance information of the first UE, or decide whether to carry the second identifier when sending the paging message to the first UE. The assistance information of the first UE can be sent by the first UE to the access network device, for example, before S202, the first UE sends the assistance information to the access network device, so that the access network device can receive the assistance information.

[0211] The assistance information of the first UE can indicate one or more of the following: signal quality of the first UE, position of the first UE, or whether the first UE tends to (or expects; or requests) receive the alarm signal. For example, the assistance information of the first UE includes one or more of the following: measurement information of the first UE, position information of the first UE, power information, or information of whether the first UE tends to (or expects; or requests) receive the alarm signal. Among them, the measurement information of the first UE and / or the power information can indicate the signal quality of the first UE; the position information of the first UE can indicate the position where the first UE is located; and the information of whether the first UE tends to receive the alarm signal can indicate whether the first UE tends to receive the alarm signal.

[0212] Optionally, the measurement information of the first UE included in the assistance information comprises one or more of the following: a difference between a signal quality of the first UE when entering the RRC connected state this time and a signal quality of the first UE after entering the RRC connected state this time, distribution information of the signal quality of the first UE in a historical first time duration, or a signal quality of the first UE before entering the RRC connected state this time. Through the measurement information, the channel quality of the first UE can be reflected.

[0213] Optionally, the location information of the first UE included in the assistance information comprises one or more of the following: global navigation satellite system (GNSS) information corresponding to the first UE, a tracking area (TA) identifier corresponding to the first UE, an identifier of the access network device in which the first UE resides, an identifier of the first cell in which the first UE resides, or an identifier of a synchronization signal / physical broadcast channel (PBCH) block (SSB) in a coverage of which the first UE is located.

[0214] Optionally, the power information included in the assistance information indicates a supplemental power of the first UE, or indicates a power level to which the supplemental power of the first UE belongs. The supplemental power of the first UE can be a difference between a required reception power of the first UE and an actual reception power of the first UE. The required reception power of the first UE is, for example, a power at which the first UE can demodulate a received signal. If the actual reception power of the first UE is less than the required reception power of the first UE, the first UE can fail to demodulate the received signal. For example, the required reception power of the first UE is a, and the actual reception power of the first UE is b, b is less than a, the first UE can indicate a value of (a-b), or an absolute value of (a-b), or a power level to which the value of (a-b) belongs, or a power level to which the absolute value of (a-b) belongs, through the assistance information. One power level can include one or more powers. After the power levels are divided, the assistance information indicates the power level, instead of indicating a specific power, and the number of power levels is less than the number of specific powers, thereby reducing the overhead of indicating the power information. Optionally, if the actual reception power of the first UE is greater than or equal to the required reception power of the first UE, the assistance information can not include the power information. For example, if the assistance information includes the power information, it can indicate that the reception power of the first UE is insufficient, or that the channel condition of the first UE is poor.

[0215] For example, if the access network device determines one or more of the following according to the assistance information of the first UE: the signal quality of the first UE is lower than a first threshold, the first UE is located at a cell edge, the first UE is of a supplemental power or a power class to which the supplemental power belongs, or the first UE tends to (or expects; or requests) receive an alarm signal, the access network device can perform S202. In this case, it is indicated that the channel condition of the first UE can be poor, and if the overhead of the paging message is too large, the first UE can not be able to receive, so the access network device can reduce the overhead of the paging message by reducing the size of the first identifier, so as to improve the reception success rate of the first UE for the paging message.

[0216] For another example, if the access network device determines one or more of the following according to the assistance information of the first UE: the signal quality of the first UE is greater than or equal to a first threshold, the first UE is located at a cell center, or the first UE does not tend to (or does not expect; or does not request) receive an alarm signal, the access network device can not perform S202, and the first message sent in S203 can include the first identifier. In this case, it is indicated that the channel condition of the first UE can be good, and the access network device can send the paging message carrying the first identifier without having to change the first identifier, which can simplify the operation of the access network device. And the first UE also does not have to determine the first identifier (for example, the first UE can also decide whether to determine the second identifier according to the assistance information of the first UE), which can also simplify the implementation of the first UE.

[0217] S203, the access network device sends a first message. Correspondingly, the first UE can receive the first message. The first message can be used to page the first UE, for example, the first message is a paging message.

[0218] For example, the access network device can send the first message at a reception occasion (for example, a PO) corresponding to the first UE; the first UE can calculate the PO corresponding to the first UE according to the parameters related to the reception occasion, so as to detect the first message at the PO. Wherein, the first UE can determine the PO in the manner described in S202.

[0219] The first message includes a second identifier. Optionally, the first message can not include the first identifier. For the first UE, the second identifier can be determined in the same manner as the access network device, so that the first UE can determine whether the second identifier is included in the received paging message. If the first message received by the first UE includes the second identifier, it indicates that the first UE is paged; or if the first message does not include the second identifier, it indicates that the first UE is not paged. If the first UE is paged, the first UE can optionally enter an RRC connected state to start transmitting traffic.

[0220] The first UE can determine the second identity by using the first information and / or the second information. Optionally, the access network device can send the first information and / or the second information, so that the first UE can determine the second identity according to the first information and / or the second information. For example, the access network device can send the first information and / or the second information through a broadcast message or a unicast message. The broadcast message can be a system message, and the unicast message can be an RRC message.

[0221] In addition, if the second identity includes M3-bit bits, different values of the M3-bit bits can correspond to different AMFs. Optionally, the access network device can send correspondence information between the values of the M3-bit bits and the AMFs, so that the first UE can determine the correspondence, and thus the first UE can determine the second identity according to the correspondence. For example, the access network device can send the correspondence information through a broadcast message or a unicast message. The broadcast message can be a system message, and the unicast message can be an RRC message.

[0222] The first information, the second information, and the correspondence information can be sent in the same message, or any two of the information can be sent in the same message, or the three information can be sent in different messages. If different messages are involved, the different messages can be the same type of message, such as broadcast messages, or can be different types of messages, which is not limited.

[0223] Optionally, the core network device can also send service information to the access network device. The service information can indicate a service type for triggering the first message (e.g., triggering the core network device to send the first message), or indicate a type of service to which the UE to be paged arrives, or indicate a missed called service type. For example, the service type can be a voice service, or a short message service, or a data service, etc. Optionally, the service information can also be indicated by a reserved bit in the first message. For example, there are 2 bits of the reserved bit in the first message, and the service information can be indicated by the reserved bit. Alternatively, the information length of the first message is unchanged, and since the identity information is compressed from the first identity to the second identity, the service information can also be carried by the compressed bits. For example, the first identity is 40 bits, and the second identity is 36 bits, and the 4 bits compressed can be used to carry the service type information. Optionally, the reserved bit and the compressed bit can be used to indicate the service information. Optionally, the service information can be included in the first message, or can not be included in the first message, but sent through other messages.

[0224] Optionally, the core network device can further send service information to the access network device, which can indicate the calling information for triggering the first message (e.g., triggering the core network device to send the first message), or the calling information of the service to be paged, or the calling information of the missed called service, etc. For example, the calling information is a telephone number, or the calling information can be used by the UE to determine the calling number, or the calling information can be used by the UE to determine whether it is a number previously stored with the network device. Optionally, the service information can also be indicated by the reserved bits in the first message. For example, there are 2 bits reserved in the first message, which can be used to indicate 4 pre-stored calling numbers. Or the information length of the first message is unchanged, and since the identification information is compressed from the first identification to the second identification, the service information can also be carried by the compressed bits. For example, the first identification is 40 bits, and the second identification is 36 bits, and the compressed 4 bits can be used to carry the calling information of the service, which can be used to indicate 16 pre-stored calling numbers. Or the compressed 4 bits can be used to indicate 15 pre-stored calling numbers, and indicate that the calling information is not pre-stored. Optionally, the reserved bits and the compressed bits can be used in combination to indicate the calling information. Optionally, the service information can be included in the first message, or can not be included in the first message, but sent through other messages.

[0225] In the foregoing steps, the access network device determines the second identification, or the core network device can also determine the second identification. For example, the core network device determines the second identification according to the first identification, and the first paging message sent by the core network device in S201 can include the second identification. Optionally, the first paging message does not include the first identification. Then, the access network device can send the first message after receiving the first paging message, without determining the second identification again. For example, the core network device can determine the second identification in the manner introduced in S202, and for the first information and / or the second information that can be used, the access network device can send them to the core network device. In the embodiments of the present application, if the first UE is in the RRC non-connected state, the network device can page the first UE through the first message, so that the first UE can start to transmit the service after receiving the first message, thereby improving the success rate of service transmission. In addition, the first message can include the second identification of the UE, and the number of bits occupied by the second identification can be less than the number of bits occupied by the first identification of the UE, which means that the length of the identification is reduced in the embodiments of the present application, thereby saving signaling overhead, or without changing the size of the first message, more information can be transmitted. Optionally, since the overhead of the first message is small, it is more conducive to improving the coverage of the first message. For example, the network device can send the first message multiple times to improve the success rate of receiving the first message by the first UE, thereby achieving a better effect of prompting the UE.

[0226] In a satellite communication scenario, the distance between a UE and a satellite is far, which can cause the signal quality of the UE to be unstable. For example, the UE needs to be aligned with the satellite, so that the UE is in a light of sight (LoS) path with the satellite, and thus communicates with the satellite. However, sometimes the UE can not be in a suitable environment, for example, the UE can be put into a pocket by a user, so that the UE is in a non-LoS path with the satellite, and thus the channel condition of the UE is poor, which can cause the UE to be unable to communicate with the network. For example, when the UE is paged, the UE can not receive the paging message due to the poor channel condition. Therefore, an embodiment of the present application can introduce a signal, for example, an alert signal, or a robust notification signal, or can have other names, for example, a resilient notification signal, which is taken as an example in the present application. The alert signal can be sent in a broadcast manner, and the function of the alert signal is similar to paging, for example, the alert signal can be used to page the UE, or to prompt the UE that there is service arrival, or to prompt the UE to change the environment in which the UE is located, or to prompt the UE to align with the satellite, or to prompt the UE to move to the LoS path with the satellite, or to prompt the UE to improve the channel quality of the UE, etc. Alternatively, the function of the alert signal is to prompt the UE to miss the paging or the called service. Optionally, coverage enhancement can be set for the alert signal, for example, the alert signal can be sent multiple times to improve the UE reception success rate. After the UE receives the alert signal, the UE can enter an RRC connected state, or can output prompt information to prompt the user to change the environment in which the UE is located, or to prompt the user to align the UE with the satellite, or to prompt the user to move the UE to the LoS path with the satellite, or to prompt the user to improve the channel quality of the UE, or to remind the user of the called service, or to remind the user of the missed called service.

[0227] For example, the network device (e.g., a core network device and / or an access network device) can no longer send a paging message, but instead use the alarm signal to replace the paging message. For example, when the network device wants to page the UE, the UE can be paged by sending the alarm signal. Alternatively, the paging message can still be sent, and if the paging message sent by the network device (e.g., a core network device and / or an access network device) does not receive a response from the UE, the network device (e.g., a core network device and / or an access network device) can send an alarm signal, and since the alarm signal is subjected to coverage enhancement processing, the UE has a relatively high success rate of receiving the alarm signal. The alarm signal can be used to prompt the UE that there is incoming traffic, or can be used to prompt the UE that the paging has failed, or provide information of the missed paging of the UE. Alternatively, the alarm signal can also be sent in other scenarios, and the embodiments of the present application do not limit this.

[0228] Another communication method is provided in an embodiment of the present application, in which an alarm signal is introduced. Please refer to FIG. 3, which is a flowchart of the method.

[0229] S301, the core network device sends a second message to the access network device. Correspondingly, the access network device receives the second message. The second message can include the first identifier of the UE.

[0230] The second message can be used to page the UE, for example, the second message is a paging message. For example, the core network device can initiate paging to the UE for the first time; or, the core network device can have initiated paging to the UE, for example, the core network device has sent a paging message to the UE before S301, but has not received a response from the UE, for example, the UE has not entered an RRC connected state, and then the core network device can send a paging message again to page the UE.

[0231] Optionally, if the second message is a paging message, the paging message can further indicate whether the UE has the capability of receiving the alarm signal, and / or indicate whether to send the alarm signal to the UE. Whether the UE has the capability of receiving the alarm signal can be determined by the core network device according to the capability information of the UE. For example, the UE can send the capability information to the core network device, and the core network device can receive the capability information, for example, this step occurs before S301, for example, the UE can send the capability information to the core network device in the process of registering to the core network. The capability information can indicate whether the UE has the capability of receiving the alarm signal.

[0232] Alternatively, the second message is an alarm signal (or an alarm message, or an enhanced paging message, which has the same function as the alarm signal described above). For example, the core network device can initiate paging to the UE for the first time, but the core network device does not send a paging message, but sends a second message; or, the core network device has sent a paging message to the UE before S301, or has sent an alarm signal to the UE before S301, but has not received a response from the UE, for example, the UE does not enter the RRC connected state, then the core network device can send the second message.

[0233] The UE can also be referred to as a first UE. The first identifier is, for example, a 5G-S-TMSI of the first UE, or can also be another identifier of the first UE. The 5G-S-TMSI can be allocated to the first UE by the core network device (for example, AMF) in the process of the first UE registering to the core network device, or can be allocated to the first UE by the core network device after the first UE sends a service request message to the core network device. The first UE can be in an RRC non-connected state, for example, in an RRC idle state.

[0234] The core network device related to the embodiments of the present application can be, for example, an AMF, or can also be another device in the core network.

[0235] S301 is an optional step, for example, the access network device can also determine the second identifier and send the first message to be described below by itself.

[0236] S302, the access network device determines the second identifier of the first UE according to the first identifier.

[0237] Optionally, the number of bits occupied by the second identifier can be less than the number of bits occupied by the first identifier; or the length of the second identifier is less than the length of the first identifier; or the information amount of the second identifier is less than the information amount of the first identifier. For the introduction of the first identifier, please refer to the embodiment shown in FIG. 2.

[0238] Optionally, the access network device can determine the second identifier according to the first identifier, and the first information and / or the second information. The first information and / or the second information can be included in the configuration information of the first cell, or can also be included in other information. The first cell is a cell in which the access network device pages or searches for the first UE, for example, the access network device can send the first message in the first cell, which will be described below.

[0239] As an optional implementation of the second identifier, the second identifier can include all or part of the bits in the first identifier except the high M2 bits, or the second identifier can not include the high M2 bits in the first identifier, where M2 is a positive integer. As another optional implementation of the second identifier, the second identifier can include all or part of the bits in the first identifier except the high M2 bits, or the second identifier can not include the high M2 bits in the first identifier; in addition, the second identifier can also include M3 bits. For example, the second identifier determined by the access network device according to the first information and the first identifier can satisfy the above relationship.

[0240] Regarding the above, for example, the first information, and how the access network device determines the second identifier according to the first information and the first identifier, etc., can refer to S202 of the embodiment shown in FIG. 2.

[0241] Regarding the second information, in an optional implementation, the second information can include a parameter related to the reception occasion of the first message. Optionally, the parameter related to the reception occasion of the first message included in the second information can include the number of reception frames included in the reception period of the first message, and / or the number of reception occasions corresponding to the first UE included in one reception frame. Alternatively, the parameter related to the reception occasion of the first message included in the second information can include the number of reception occasions corresponding to the first UE included in the reception period of the first message. Wherein, the first message will be introduced in the following steps, and in the embodiment of the present application, the first message can be used to page the first UE, for example, the first message is a paging message. Therefore, the reception occasion of the first message can be PO, the reception period of the first message can be the paging period, and the reception frame can refer to PF. Alternatively, in the embodiment of the present application, the first message can also be an alarm signal, and the reception occasion of the first message can be the reception occasion of the alarm signal, for example, referred to as the alert occasion (AO), which can include a time unit, or a group of consecutive time units, or can also include multiple discontinuous time units; the reception period of the first message can be the reception period of the alarm signal, for example, referred to as the alert period; and the reception frame can be a frame including the alarm signal, for example, referred to as the alert frame. Wherein, the time unit is, for example, a slot, a mini-slot, an orthogonal frequency division multiplexing (OFDM) symbol group, or an OFDM symbol.

[0242] For example, the access network device can determine a parameter related to the receiving occasion of the first message according to the second information. According to the parameter, the access network device can determine the second identity. As an optional implementation of the second identity, the second identity can include part or all of the bits in the first identity except the lower M1 bits, or the second identity can not include the lower M1 bits in the first identity, where M1 is a positive integer.

[0243] If the first message is a paging message, the manner of determining M1 according to the parameter related to the receiving occasion of the first message can refer to S202 of the embodiment shown in FIG. 2, for example, M1 is determined according to formula 3 or formula 4. Alternatively, if the first message is an alarm signal, optionally, M1 can be determined in the manner of determining M1 related to the paging message, for example, M1 is also determined according to formula 3 or formula 4, for example, N in formula 3 represents the total number of alarm frames included in one receiving period, N s represents the total number of alarm occasions included in one alarm frame. Alternatively, for example, X in formula 4 represents the number of alarm occasions included in one alarm period, for example, X = N × N s .

[0244] As introduced in the foregoing, the access network device can determine the second identity according to the first identity, and the first information and / or the second information, that is, the foregoing manner of determining the second identity can be applied separately, or the foregoing manner of determining the second identity can also be applied in combination. For this part of content, refer to S202 of the embodiment shown in FIG. 2.

[0245] Optionally, the access network device in the embodiment of the present application can also decide whether to determine the second identity, for example, whether to determine the second identity according to the auxiliary information of the first UE. For this, refer to S202 of the embodiment shown in FIG. 2.

[0246] S303, the access network device sends the first message. Correspondingly, the first UE can receive the first message. The first message can also be referred to as the fifth message, and the name is not limited. Optionally, the first message also includes service indication information, which can indicate the called service of the first UE, or indicate the service arrived at the first UE. The access network device can be looking for the first UE because of the service. For example, the service arrived at the first UE is a voice service, or the service arrived at the first UE is a short message service, or the service arrived at the first UE is a data service, etc. Alternatively, the service indication information can indicate that the current system information has changed. If the system information has changed, if the UE does not receive the updated system information in time, the subsequent service may not be able to continue to be received, for example, the enhanced paging service is received; therefore, if the system information has changed, the UE can receive the updated system information in time.

[0247] The first message is, for example, a paging message, or can also be an alarm signal. Optionally, the second message in S301 is a paging message, and the first message can be a paging message or an alarm signal, and the specific type of message or signal to be sent can be determined by the access network device. For example, the second message is a paging message, and the second message further indicates whether the first UE has the capability of receiving an alarm signal, and / or indicates whether to send an alarm signal to the first UE. For example, the second message indicates that the first UE has the capability of receiving an alarm signal, and / or indicates to send an alarm signal to the first UE, and the first message can be an alarm signal to improve the reception success rate of the first UE. For another example, the second message indicates that the first UE does not have the capability of receiving an alarm signal, and / or indicates not to send an alarm signal to the first UE, and the first message can be a paging message. Alternatively, the access network device can also determine whether to send a paging message or an alarm signal according to other factors. If the first message sent by the access network device is an alarm signal, it can be considered that the access network device triggers the sending of the alarm signal.

[0248] Alternatively, the second message is an alarm signal, and the first message can be an alarm signal. In this way, it can be considered that the core network device triggers the sending of the alarm signal.

[0249] The access network device can send the first message at a receiving occasion corresponding to the first message, and the first UE can detect the first message at the receiving occasion. The first UE can determine the receiving occasion first, for example, the first UE can determine the receiving occasion according to parameters related to the receiving occasion. For example, if the first message is a paging message, the first UE can determine the receiving occasion in the manner of S202 of the embodiment shown in FIG. 2.

[0250] Alternatively, if the first message is an alarm message, the first UE can determine the receiving occasion (for example, an alarm occasion) in a manner similar to determining a PO. For example, the first UE can determine the SFN for listening to the alarm signal and the index of the alarm occasion in the SFN in a manner similar to paging, so as to determine the receiving occasion. For example, the first UE can determine the SFN for listening to the alarm signal by using formula 1, and determine the index of the alarm occasion corresponding to the first UE in the SFN, for example, referred to as a second index, by using formula 2.

[0251] At this time, SFN in formula 1 represents the frame number of the system frame including the alarm occasion corresponding to the first UE; T represents the receiving period of the alarm occasion; N represents the total number of alarm frames included in one receiving period, and the determination manner of UE_ID can refer to the introduction of formula 1 in the embodiment shown in FIG. 2; PF offset For example, replace AF offset , which represents the offset of the alarm frame.

[0252] i in formula 2s denotes a second index, N s denotes a total number of alarm occasions included in an alarm frame. The first UE can determine the second index according to formula 2.

[0253] Alternatively, if the first message is an alarm message, the first UE can also determine the receiving occasion in other manners, for example, according to a parameter related to the receiving occasion corresponding to the alarm message, which can be similar to the parameter used for determining the PO, or can be different from the parameter used for determining the PO; the formula used for determining the receiving occasion can be similar to formula 1 and / or formula 2, or can be a different formula. Optionally, the first UE can determine the receiving occasion according to the first identity and a first parameter, the first parameter including the parameter related to the receiving occasion corresponding to the alarm message.

[0254] Optionally, the first message can include the first identity of the first UE, so that the first UE can determine whether the first UE is paged or prompted, etc. If the first message includes the first identity, it indicates that the first UE is paged or prompted; or if the first message does not include the first identity, it indicates that the first UE is not paged or prompted. If the first UE is paged or prompted, optionally, the first UE can enter the RRC connected state to start transmitting traffic. Wherein, if the first message includes the first identity, the access network device can not have to perform S302, and therefore S302 is an optional step.

[0255] Alternatively, the first message includes the second identity, and the first message can optionally not include the first identity. The first UE can determine the second identity in the same way as the access network device, so that the first UE can determine whether the second identity is included in the received first message. If the first message includes the second identity, it indicates that the first UE is paged or prompted; or if the first message does not include the second identity, it indicates that the first UE is not paged or prompted. If the first UE is paged or prompted, the first UE can optionally enter the RRC connected state to start transmitting traffic. Alternatively, if the first message includes the second identity of the first UE, after the first UE receives the first message (e.g., when the first message is received), the first UE can perform one or more of the following processes: attempt to enter the RRC connected state, start a timer, or output a prompt message. The timer can be used to detect the state of the first UE. Before the timer expires, if the first UE enters the RRC connected state, the first UE can stop the timer. For example, before the timer expires, if the channel condition of the first UE is good or becomes good, the first UE can enter the RRC connected state; and when the timer expires, if the first UE has not entered the RRC connected state, for example, the channel condition of the first UE is poor and the first UE cannot enter the RRC connected state, etc., the first UE can record the reason for the failure to enter the RRC connected state. If the first UE attempts to enter the RRC connected state again next time, it can report the recorded failure reason this time.

[0256] The prompt message can prompt the user to improve the environment of the first UE, and the first UE can output the prompt message in the form of audio, characters, or video, etc. After the user using the first UE receives the prompt message, the user can improve the environment of the first UE, for example, the user can take the first UE out of the pocket, or move the first UE to a place with better channel conditions (e.g., from the basement to the ground, or align the first UE with the satellite, etc.), so as to improve the channel conditions of the first UE, and improve the success rate of the first UE entering the RRC connected state.

[0257] Alternatively, the prompt message can prompt the user that there is incoming traffic, or indicate the subsequent service situation of the traffic, etc. The first UE can output the prompt message in the form of audio, characters, or video, etc. After the user using the first UE receives the prompt message, the user can know the service situation of the subsequent traffic, such as no service in the subsequent traffic.

[0258] Alternatively, the prompt message can prompt the user that there is incoming traffic, or indicate the subsequent service situation of the traffic, etc. The first UE can output the prompt message in the form of audio, characters, or video, etc. After the user using the first UE receives the prompt message, the user can know the service situation of the subsequent traffic, such as no service in the subsequent traffic.

[0259] If the first message can include the second identity, the first UE can first determine the second identity, which can use the first information and / or the second information. Optionally, the access network device can send the first information and / or the second information, so that the first UE can determine the second identity according to the first information and / or the second information. For example, the access network device can send the first information and / or the second information through a broadcast message or a unicast message. The broadcast message can be a system message, and the unicast message can be an RRC message.

[0260] In addition, if the second identity includes M3-bit bits, different values of the M3-bit bits can correspond to different AMFs. Optionally, the access network device can send the correspondence information between the values of the M3-bit bits and the AMFs, so that the first UE can determine the correspondence, and thus the first UE can determine the second identity according to the correspondence. For example, the access network device can send the correspondence information through a broadcast message or a unicast message. The broadcast message can be a system message, and the unicast message can be an RRC message.

[0261] The first information, the second information, and the correspondence information can be sent in the same message, or any two of the information can be sent in the same message, or the three information can be sent in different messages. If different messages are involved, the different messages can be the same type of message, such as broadcast messages, or can be different types of messages, which is not limited.

[0262] Optionally, the core network device can also send service information to the access network device. The service information can indicate a service type for triggering the second message (e.g., triggering the core network device to send the second message), or indicate a type of service to which the UE to be paged arrives, or indicate a missed called service type. For example, the service type can be a voice service, or a short message service, or a data service, etc. Optionally, the service information can also be indicated by a reserved bit in the second message. For example, there are 2 bits of the reserved bit in the second message, which can be used to indicate the service information. Alternatively, the information length of the second message is unchanged, and since the identity information carried by the first identity is compressed into the second identity, the service information can also be carried by the bits compressed. For example, the first identity is 40 bits, and the second identity is 36 bits. The 4 bits compressed can be used to carry the service type information. Optionally, the reserved bit and the compressed bit can be used to indicate the service information. Optionally, the service information can be included in the second message, or can not be included in the second message, but sent through other messages.

[0263] Optionally, the core network device can further send service information to the access network device, which can indicate the calling information for triggering the second message (e.g. triggering the core network device to send the second message), or the calling information of the service to be paged, or the calling information of the missed called service, etc. For example, the calling information can be a phone number, or the calling information can be used by the UE to determine the calling number, or the calling information can be used by the UE to determine whether it is a number previously stored with the network device. Optionally, the service information can also be indicated by the reserved bits in the second message. For example, there are 2 bits reserved in the second message, which can be used to indicate 4 pre-stored calling numbers. Alternatively, the information length of the second message is unchanged, and since the identification information is compressed from the first identification to the second identification, the service information can also be carried by the bits compressed out. For example, the first identification is 40 bits, and the second identification is 36 bits, and the 4 bits compressed out can be used to carry the calling information of the service, which can be used to indicate 16 pre-stored calling numbers. Alternatively, the 4 bits compressed out can be used to indicate 15 pre-stored calling numbers, and indicate that the calling information is not pre-stored. Optionally, the reserved bits and the compressed bits can be used in combination to indicate the calling information. Optionally, the service information can be included in the second message, or can not be included in the second message, but sent through other messages.

[0264] In the foregoing steps, the access network device is taken as an example to determine the second identification, or the core network device can also determine the second identification. For example, the core network device determines the second identification according to the first identification, and the second message (which can also be referred to as the fifth message) sent by the core network device in S301 can include the second identification, and optionally, the second message does not include the first identification. After receiving the second message, the access network device can send the first message, without determining the second identification again. For example, the core network device can determine the second identification in the manner introduced in S302, and for the first information and / or the second information that can be used, the access network device can send them to the core network device.

[0265] In the embodiments of the present application, if the first UE is in an RRC non-connected state, the network device can page or prompt the first UE through the first message, so that the first UE can start transmitting services after receiving the first message, thereby improving the success rate of service transmission, or the first message can be used to inform the UE of the missed called services, so that the terminal device can prompt the user of the missed services, thereby prompting the user to make a voice callback or obtain messages, thereby avoiding the user from missing important information. In addition, the first message can include a second identifier of the UE, and the number of bits occupied by the second identifier can be less than the number of bits occupied by the first identifier, which means that the embodiments of the present application can save signaling overhead by reducing the length of the identifier, or the data amount of the first message transmission remains unchanged, but more information can be carried. Optionally, since the first message has a small overhead, it is more conducive to improving the coverage of the first message. For example, the network device can send the first message multiple times to improve the success rate of receiving the first message by the first UE, thereby achieving a better effect of prompting the UE. Moreover, since the first message has a small overhead, the saved resources can be used for other transmission processes, thereby improving the resource utilization rate.

[0266] The embodiments of the present application provide another communication method, in which an alarm signal is also introduced. Unlike the foregoing methods, the message in the embodiments of the present application can not include an identifier of a UE, but can include other identifiers. Please refer to FIG. 4, which is a flowchart of the method.

[0267] S401, the network device sends a fourth message. Correspondingly, the fourth message can also be referred to as a fifth message, and the name is not limited.

[0268] The network device can be a core network device, for example, an AMF, and the fourth message can be sent to an access network device. Alternatively, the network device can also be an access network device, and the receiving end of the fourth message can be a UE, for example, the first UE. If the network device is an access network device, before S401, the access network device can also receive a sixth message from a core network device, for example, a paging message or an alarm signal. For details, please refer to the related description of the embodiments shown in FIG. 3. For example, the sixth message includes a first identifier of the first UE. Alternatively, if the network device is a core network device, after S401, the access network device can also send a seventh message, for example, a paging message or an alarm signal. For details, please refer to the related description of the embodiments shown in FIG. 2 or FIG. 3.

[0269] The fourth message can be used to page the UE, for example, the fourth message is a paging message. For example, the core network device can initiate paging to the first UE for the first time; or, the core network device can have initiated paging to the first UE before S401, for example, the core network device has sent a paging message to the first UE before S401, but has not received a response from the first UE, for example, the first UE does not enter the RRC connected state, and the core network device can send a paging message again to page the first UE.

[0270] Optionally, if the fourth message is a paging message, the paging message can further indicate whether the first UE has the capability of receiving the alarm signal, and / or indicate whether to send the alarm signal to the first UE. Whether the first UE has the capability of receiving the alarm signal can be determined by the core network device according to the capability information of the first UE. For this, refer to S301 of the embodiment shown in FIG. 3.

[0271] Alternatively, the second message is an alarm signal (or an alarm message, which has the same function as the alarm signal described above). For example, the core network device can initiate paging to the first UE for the first time, but the core network device does not send a paging message, but sends the fourth message; or, the core network device has sent a paging message to the UE before S401, or has sent an alarm signal to the first UE before S401, but has not received a response from the first UE, for example, the first UE does not enter the RRC connected state, and the core network device can send the fourth message.

[0272] Optionally, the fourth message can include the first identifier of the first UE, or include the second identifier of the first UE, or include the first alarm identifier corresponding to the first UE. The first alarm identifier can also be referred to as a third identifier, and the like, and the name is not limited. If the network device is a core network device, the access network device receives the fourth message and further sends a seventh message, and if the fourth message includes the first identifier of the first UE, the seventh message can include the first identifier, the second identifier, or the first alarm identifier of the first UE; or, if the fourth message includes the second identifier of the first UE, the seventh message can include the first identifier, the second identifier, or the first alarm identifier of the first UE; or, if the fourth message includes the first alarm identifier, the seventh message can include the first identifier, the second identifier, or the first alarm identifier of the first UE.

[0273] For the case that the fourth message includes the first identifier or the second identifier, refer to the embodiments shown in FIG. 2 or FIG. 3, and the first alarm identifier is mainly introduced herein. The number of bits occupied by the first alarm identifier can be less than the number of bits occupied by the identifier (for example, the first identifier) of the first UE, thereby saving transmission overhead; or, the number of bits occupied by the first alarm identifier can also be greater than or equal to the number of bits occupied by the first identifier, and the embodiments of the present application are not limited.

[0274] The first warning identifier may be assigned by the network device to the first UE. Optionally, the network device may assign warning identifiers to K UEs based on the auxiliary information of at least one UE, with different UEs corresponding to different warning identifiers. The K UEs may be some or all of the at least one UE, and the first UE may be one of the K UEs, where K is a positive integer. For example, before S401, at least one UE may send auxiliary information to the network device. FIG4 takes the example of the first UE sending auxiliary information to the network device, and reference may be made to S402. Regarding the content included in the auxiliary information of the first UE, reference may be made to the relevant description of the embodiment shown in FIG2. The types of auxiliary information included by different UEs may be the same, for example, the auxiliary information of the first UE and the auxiliary information of the second UE both include measurement information and location information; or the types of auxiliary information included by different UEs may be completely different or partially different, for example, the auxiliary information of the first UE includes measurement information and location information, and the auxiliary information of the second UE includes power information; or the auxiliary information of the first UE includes measurement information and location information, and the auxiliary information of the second UE includes measurement information and power information, etc.

[0275] Optionally, K may be determined based on auxiliary information of at least one UE. For example, if the network device determines, based on the auxiliary information of at least one UE, that some of the UEs have poor channel conditions (for a determination method, refer to the embodiment shown in FIG2 ), then these UEs may belong to the K UEs. Alternatively, if the network device determines, based on the auxiliary information of at least one UE, that some of the UEs have good channel conditions, then these UEs may not belong to the K UEs.

[0276] Optionally, the number of bits occupied by the first alarm identifier may be related to K, for example, the number of bits may be greater than or equal to log2K. For example, the number of bits occupied by the alarm identifier corresponding to each of the K UEs may be the same, and the number of bits may be greater than or equal to log2K. For example, based on the auxiliary information of at least one UE, the network device may determine that the first area includes K UEs that need to be assigned alarm identifiers (for example, the network device determines that among the UEs included in the first area, K UEs have poor channel conditions, and then it may be determined that the K UEs need to be assigned alarm identifiers), so that the network device may assign alarm identifiers to the K UEs. The number of bits occupied by the alarm identifier corresponding to each UE may be determined based on K, for example, the number of bits may be greater than or equal to log2K. For example, K=2 15 , then these 2 15 The number of bits occupied by the warning identifier allocated to each of the UEs may be greater than or equal to 15. It can be understood that the purpose of allocating warning identifiers to K UEs is to distinguish K UEs. If K=2 15 , then these 2 can be converted into 15The UE is distinguished, so the alarm identifier occupies 15 bits, which can realize the distinction of different UEs. The UE is paged or prompted through the alarm identifier, and each UE can determine whether the UE is paged or prompted, and 15 bits are less than 48 bits occupied by the 5G-S-TMSI, so the identifier of the UE occupying a large number of bits does not need to be carried in the corresponding message (for example, the fourth message), which can save the transmission overhead to a large extent.

[0277] The reason why the number of bits is greater than log2K is that the possible expansion is considered. For example, the network device may subsequently find that there are still UEs that need to be allocated alarm identifiers, and the reserved value in the value corresponding to the number of bits can be used to allocate to the new UE.

[0278] Alternatively, the number of bits occupied by the first alarm identifier can also be less than log2K, for example, when the resources are insufficient, it can not be possible to allocate more bits as alarm identifiers.

[0279] For the K UEs to be allocated alarm identifiers, the network device can treat them equally and uniformly allocate alarm identifiers to them, and the number of bits occupied by each alarm identifier can be the same, which can be referred to in the foregoing. Alternatively, for the K UEs to be allocated alarm identifiers, the network device can also group them and allocate alarm identifiers to the UEs in each group. For example, the auxiliary information of the K UEs all includes power information, and the network device can determine the supplemental power or power level corresponding to the K UEs according to the power information corresponding to the K UEs, so that the K UEs can be grouped according to different supplemental power or power levels, and the supplemental power or power level corresponding to the UEs in each group is the same. For each group, the network device can allocate alarm identifiers respectively. For each group, the alarm identifier allocated to each UE in the group can occupy the same number of bits, and the alarm identifiers corresponding to different groups can occupy the same or different number of bits. Optionally, the UEs in each group correspond to the same receiving occasion, or it is understood that this grouping manner is to allocate the UEs corresponding to the same supplemental power or power level to the same receiving occasion. After grouping, the alarm identifiers corresponding to different groups can occupy the same or different number of bits, for example, the alarm identifiers corresponding to some groups can occupy fewer bits, compared with the scheme that the alarm identifiers corresponding to the K UEs occupy the same number of bits, the alarm identifiers after grouping can further reduce the number of bits, which is beneficial to save the transmission overhead. Optionally, the larger the supplemental power or the higher the power level corresponding to a group, the fewer the number of bits occupied by the alarm identifier corresponding to the group; and the smaller the supplemental power or the lower the power level corresponding to a group, the more the number of bits occupied by the alarm identifier corresponding to the group. The higher the power level, the greater the corresponding supplemental power, or the higher the gain requirement.

[0280] For example, for any one of the groups, the number of bits occupied by the corresponding alarm identifier can be related to P, where P represents the number of UEs included in the group. For example, the number of bits can be greater than or equal to log2P. For example, according to the assistance information of at least one UE, the network device can determine that K UEs included in the first region need to be allocated an alarm identifier (for example, the network device determines that among the UEs included in the first region, the channel conditions of K UEs are poor, and then determines that the K UEs need to be allocated an alarm identifier), and the K UEs correspond to at least one supplemental power or power level, then the network device can divide the K UEs into at least one group, where each group corresponds to one supplemental power or power level, so that the network device can allocate alarm identifiers to the UEs in the at least one group respectively. For any one of the groups, the number of bits occupied by the corresponding alarm identifier can be determined according to P, for example, the number of bits is greater than or equal to log2P. The number of bits is greater than log2P, which is also considering the possible expansion, which can be referred to in the foregoing. Alternatively, the number of bits can also be less than log2P, for example, when the resources are insufficient, it can not be possible to allocate more bits as alarm identifiers.

[0281] For example, there are two groups, and the number of UEs included in the two groups is different. If the number of bits occupied by the corresponding alarm identifier of each group is equal to log2P, then the number of bits occupied by the corresponding alarm identifier of the two groups is different. Alternatively, the number of bits occupied by the corresponding alarm identifier of each group can also be greater than log2P, and the number of bits occupied by the corresponding alarm identifier of the two groups can be the same or different. For example, there are two groups, and the number of UEs included in the two groups is the same. If the number of bits occupied by the corresponding alarm identifier of each group is equal to log2P, then the number of bits occupied by the corresponding alarm identifier of the two groups is the same. Alternatively, the number of bits occupied by the corresponding alarm identifier of each group can also be greater than log2P, and the number of bits occupied by the corresponding alarm identifier of the two groups can be the same or different. It can be seen that even if the number of UEs included in the two groups is the same, the number of bits occupied by the corresponding alarm identifier of the two groups can be different.

[0282] This is because the UEs with different supplemental powers or power levels require different gains. For UEs requiring a larger gain, if the needs of such UEs are to be met, more resources need to be allocated, and even if more resources are allocated, the number of such UEs that can be met is limited (because each UE in such UEs requires more resources). Therefore, for such UEs, less resources can be allocated to prevent the needs of other more UEs from being met in the case of limited resources. And some UEs require a smaller gain, and a large number of such UEs can be met by allocating less resources, so more resources can be allocated to such UEs, so that more UEs can be met. For example, for UEs corresponding to a supplemental power or power level,

[0283] For example, the gain requirement corresponding to power level 1 is 10db, and the gain requirement corresponding to power level 2 is 20db. Obviously, the UE of power level 2 requires more resources. If the number of UEs corresponding to power level 1 is 4, and the number of UEs corresponding to power level 2 is also 4, the network device can allocate 5 bits as the alarm identifier for the UE of power level 1, and allocate 3 bits as the alarm identifier for the UE of power level 2, so that the limited resources can accommodate more UEs (for example, UEs under power level 1). For another example, the gain requirement corresponding to power level 1 is 10db, and the gain requirement corresponding to power level 2 is 20db. Obviously, the UE of power level 2 requires more resources. If the number of UEs corresponding to power level 1 is 4, and the number of UEs corresponding to power level 2 is also 4, the alarm identifiers corresponding to the two groups should both be greater than 2 in terms of the number of bits occupied, but the resources are limited, so the network device can allocate more bits as the alarm identifier for the UE of power level 1, for example, 2 bits; and allocate less bits as the alarm identifier for the UE of power level 2, for example, 1 bit.

[0284] In addition to the above manner, the network device can allocate alarm identifiers for the K UEs in other manners, which are not limited.

[0285] Optionally, the network device can send the allocated alarm identifiers, so that the K UEs can explicitly determine the alarm identifier allocated for the UE. For example, the network device can send the association relationship information between the K UEs and the K alarm identifiers. Optionally, the network device can send the association relationship information between the first identifiers of the K UEs and the K alarm identifiers, or the association relationship information between the second identifiers of the K UEs and the K alarm identifiers. Correspondingly, the UE can determine the alarm identifier of the UE according to the first identifier or the second identifier of the UE. In addition, the association relationship information can further include the area information corresponding to the K alarm identifiers, where the area information corresponding to different alarm identifiers can be the same (for example, the network device allocates alarm identifiers for the K UEs uniformly, and the areas corresponding to the K alarm identifiers can be the same), or the area information corresponding to different alarm identifiers can be different (for example, the network device groups the K UEs, and allocates alarm identifiers for different groups respectively, and the alarm identifiers belonging to the same group in the K alarm identifiers correspond to the same area, and the alarm identifiers belonging to different groups correspond to the same or different areas). The area corresponding to an alarm identifier represents the range to which the alarm identifier is applicable. For example, if the UE corresponding to the alarm identifier is in the area, the alarm identifier can be used; and if the UE is not in the area, the alarm identifier is not used. For example, the network device can send the association relationship information in a broadcast manner, and the association relationship information can be carried in a system message or other broadcast message.

[0286] Alternatively, the network device can send the first alerting identity to the first UE, for example, in a unicast manner, and the first alerting identity is carried in a RRC message or a signaling of another protocol layer. In this way, the network device can send the alerting identity to the K UEs respectively. Optionally, the network device can send the area information corresponding to the alerting identity in addition to sending the alerting identity, for example, the network device can send the first alerting identity to the first UE and the information of the first area corresponding to the first alerting identity.

[0287] For example, the information of the first area can include one or more of the following: the longitude and / or latitude of the first area, the information of the geographical grid to which the first area belongs, the information of one or more TAs included in the first area, the information of one or more RAN area updates included in the first area, the information of one or more cells included in the first area, or the information of part or all of the beams in one or more cells included in the first area.

[0288] Since the first UE knows the first alerting identity, after receiving the first message, if the first message includes the alerting identity of the UE to be paged or prompted, the first UE can identify whether the first message includes the first alerting identity, and thus determine whether the first UE is paged or prompted.

[0289] If the network device in S401 is an access network device, the access network device can send the fourth message at the reception occasion corresponding to the fourth message; the first UE can detect the fourth message at the reception occasion; or if the network device in S401 is a core network device, after the core network device sends the fourth message, the access network device also sends the seventh message, and optionally, the access network device can send the seventh message at the reception occasion corresponding to the seventh message; the first UE can detect the seventh message at the reception occasion. The first UE can determine the reception occasion first.

[0290] As an optional implementation for the first UE to determine the reception occasion, the first UE can determine the reception occasion according to the parameters related to the reception occasion. For example, if the first message is a paging message, the first UE can determine the reception occasion according to S202 of the embodiment shown in FIG. 2. Alternatively, if the first message is an alerting message, the first UE can determine the reception occasion (e.g., the alerting occasion) in a similar way as determining the PO, or determine the reception occasion in other ways, which can be referred to the related description of the embodiment shown in FIG. 3.

[0291] Alternatively, as another optional implementation of the first UE determining the receiving occasion, the first UE can determine the receiving occasion according to received information, for example, referred to as third information. The third information includes, for example, configuration information of the receiving occasion, so that the first UE can determine the receiving occasion according to the third information. The third information can be sent in a broadcast manner or a unicast manner. For example, if the network device allocates an alarm identifier to the UE, the network device can carry the alarm identifier instead of the identifier of the UE when sending the message. Carrying the alarm identifier in the message is a new way, so the network device can determine the related configuration of the receiving occasion corresponding to the alarm identifier, and can send the configuration; so the UE can not have to determine the receiving occasion by itself, but can determine the receiving occasion according to the received configuration.

[0292] The processing manner of the first UE after receiving the fourth message and the message content included in the fourth message can refer to S303 in the embodiment shown in FIG. 3.

[0293] In the embodiment, if the first UE is in the RRC non-connected state, the network device can page or prompt the first UE through the fourth message, so that the first UE can start to transmit the service after receiving the fourth message, and the success rate of service transmission is improved. In addition, the fourth message can include the first identifier, the second identifier or the first alarm identifier of the UE, that is, the fourth message can page or prompt the UE by using different types of identifiers, which is more flexible. Optionally, the number of bits occupied by the first alarm identifier can be less than the number of bits occupied by the first identifier, which is equivalent to reducing the length of the identifier in the embodiment to save signaling overhead. Optionally, since the overhead of the fourth message is small, it is more conducive to improve the coverage of the fourth message. For example, the network device can send the fourth message multiple times to improve the success rate of receiving the fourth message by the first UE, so as to achieve a better effect of prompting the UE. Moreover, since the overhead of the fourth message is small, the saved resources can be used for other transmission processes, and the resource utilization rate is improved.

[0294] The embodiment of the present application provides another communication method, in which the related paging can be enhanced. The enhanced paging is a method for a UE in a weak signal state to know that the network is paging the UE. Since the UE is currently in a weak signal state (for example, poor channel condition), the UE can prompt a user using the UE, so that the user moves to an environment meeting a subsequent connection establishment process, and the network continues to provide subsequent service for the UE. The current enhanced paging can be encoded, spread and repeatedly transmitted by a large number of paging resources for the identification of the UE. The embodiment of the present application can effectively reduce the length of the UE identification carried in the paging message in the enhanced paging process, or can carry more information by using the same length of UE identification, thereby expanding the capacity of the entire system for the enhanced paging and improving the user experience. Please refer to FIG. 5, which is a flowchart of the method.

[0295] S501, the access network device sends second information, and correspondingly, the first UE receives the second information configured by the access network device.

[0296] The second information can include parameters related to the receiving occasion (for example, the paging occasion, or the enhanced paging occasion, or the alarm occasion, etc.) of the first message, and / or include the configuration information of the core network device serving the access network device, etc. For example, the parameters related to the receiving occasion of the first message included in the second information can include the number (for example, the total number) of receiving occasions in a receiving period, and / or include the number (for example, the total number) of control channels used for sending the first message. For more content of the second information, please refer to the embodiment shown in FIG. 2 and / or the embodiment shown in FIG. 3.

[0297] Optionally, the access network device can send the second information through dedicated signaling or broadcast signaling (for example, system information). The second information can be generated and sent by the access network device; or the second information can be generated by the core network device, sent to the access network device by the core network device, and then sent by the access network device.

[0298] If the first UE knows the second information, the access network device does not have to send. Or, the first UE can determine the receiving occasion and / or the second identification by using the second information, and if the first UE does not refer to the second information when determining the receiving occasion and / or the second identification, the access network device also does not have to send the second information. Therefore, S501 is an optional step.

[0299] S502, the first UE determines the second identification of the first UE.

[0300] Optionally, the length of the second identity (in various embodiments of the present application, the length of an identity, for example, is the number of bits occupied by the identity) can be less than or equal to a second threshold, which, for example, includes the number of bits used to distinguish different UEs in different POs in a region and different UEs in the same PO in the region. For example, the second threshold can be greater than or equal to the length of the P-TMSI or G-RNTI of the first UE, and the P-TMSI or G-RNTI can be used to distinguish different UEs in different POs in a region and different UEs in the same PO in the region. Optionally, the length of the P-TMSI or the length of the G-RNTI of the first UE, for example, is 32 bits.

[0301] As an optional implementation of the determination of the second identity by the first UE, the first UE can receive the second identity from the access network device, which can be generated and sent by the access network device or sent by the core network device through the access network device. The first UE detects in the determined PO, and when the received message includes the second identity, determines that there is traffic arrival or that the first UE has missed a called service.

[0302] Alternatively, as another optional implementation of the determination of the second identity by the first UE, the first UE can determine the second identity of the first UE by itself according to the second information and the first identity of the first UE and the like. For example, the second information can include a parameter related to the reception occasion of the first message, for example, the parameter includes the number of control channels used to receive the first message and / or the number of paging groups used to receive the first message, the first identity of the first UE includes the P-TMSI or G-RNTI of the first UE, for example, and the second identity determined by the first UE includes part of the bits of the P-TMSI or the G-RNTI. Optionally, the first UE can remove part of the bits from the first identity according to the second information, and the remaining bits of the first identity can be used as the second identity.

[0303] For example, the network device (e.g., including an access network device and / or a core network device) can assign different UEs to different POs, and when assigning, can make the P-TMSI or G-RNTI of the UEs within each PO have the same value in some same bits, i.e., for different UEs within one PO, the corresponding P-TMSI or G-RNTI has the same value in these bits, and except for these bits, the P-TMSI or G-RNTI of different UEs within one PO can have different values in other bits. Therefore, these bits with the same corresponding value can be removed from the first identity to obtain the second identity, e.g., the second identity of the UE can correspond to other bits of the P-TMSI or G-RNTI with different values, so that different UEs can be distinguished within the same PO by the second identity. Which bits are removed or which bits are retained from the first identity can be configured to the UE by the access network device or the core network device, or predefined by a protocol.

[0304] Alternatively, as another optional implementation of determining the second identity by the first UE, the first UE can determine the second identity of the first UE by itself according to the first identity of the first UE. For example, the first identity of the first UE includes the P-TMSI or G-RNTI of the first UE, and the second identity determined by the first UE includes part of the bits of the P-TMSI or G-RNTI. Optionally, the first UE can remove part of the bits from the first identity, and the remaining bits of the first identity can be used as the second identity. Which bits are removed or which bits are retained from the first identity can be configured to the UE by the access network device or the core network device, or predefined by a protocol.

[0305] Optionally, the first UE can also determine the receiving occasion corresponding to the first UE. For example, the first UE can determine the receiving occasion corresponding to the first UE according to the second information and the identity of the first UE.

[0306] The identity of the first UE includes, for example, a third identity of the first UE, which includes, for example, an IMSI of the first UE, and the like. For example, the first UE can determine a receiving occasion corresponding to the first UE according to the third identity and / or the second information (for example, the number of control channels indicated by the second information for transmitting the first message and / or the number of paging groups, and the like), and the receiving occasion corresponding to the first UE can be used by the first UE to listen to a page, or listen to an enhanced page, or listen to an alarm signal, and the like. Some of the following content is exemplified by taking the receiving occasion as a PO.

[0307] Optionally, the first UE can use (IMSI mod 1000) as the UE_ID of the first UE, and determine the frequency domain information of the PO according to Formula 5 introduced in the embodiment shown in FIG. 2. The frequency domain information can include the index of the CCCH.

[0308] In addition, the first UE can determine the time domain information of the PO of the enhanced page and the time domain information of the ordinary page under the CCCH index. For example, the first UE can determine the PO corresponding to the ordinary page according to the UE_ID mod N of the first UE, where N represents the number of configured ordinary paging groups (for example, ordinary POs); and the first UE can determine the PO corresponding to the enhanced page according to the UE_ID mod M of the first UE, where M represents the number of configured enhanced paging groups (for example, enhanced POs). Thus, the first UE can determine the time domain information of the PO, which can include the index of the paging group (including the ordinary paging group and / or the enhanced paging group) that needs to be listened to by the first UE.

[0309] S503, the core network device sends a second message to the access network device, and correspondingly, the access network device receives the second message. The second message can include the first identity of the UE.

[0310] For example, the first identity of the first UE includes a P-TMSI of the first UE, which can be a user identity allocated by the core network device for the first UE.

[0311] For example, the first identifier includes an identifier allocated by the core network device to the first UE according to information (e.g., the second information) of the access network device. The length of the first identifier can be shorter than the length of the P-TMSI of the first UE, and the first identifiers of different UEs in the same PO can be ensured to be non-conflictive, while the first identifiers of different UEs in different POs can be the same or different. For example, the first identifier of the first UE includes part of bits of the P-TMSI of the first UE. Optionally, the core network device can remove part of bits from the P-TMSI according to the second information, and the remaining bits of the P-TMSI can be used as the first identifier. The manner in which the core network device removes part of bits from the P-TMSI can refer to the foregoing description of the manner in which the first UE removes part of bits from the first identifier to obtain the second identifier.

[0312] Optionally, the core network device can further send, to the access network device, a third identifier of the first UE. The third identifier of the first UE can be used by the access network device to determine a receiving occasion of the first UE for receiving the first message. Optionally, the third identifier can be included in the second message or can not be included in the second message but be sent through other messages. For example, the third identifier includes an IMSI of the first UE.

[0313] Optionally, the core network device can further send, to the access network device, service information. The service information can indicate a service type used to trigger the second message (e.g., trigger the core network device to send the second message), or indicate a type of service to which the UE to be paged arrives, or indicate a type of missed called service. For example, the service type is a voice service, or a short message service, or a data service, etc. Optionally, the service information can also be indicated through reserved bits in the second message. For example, there are 2 bits of reservation in the second message, and the service information can be indicated through the reserved bits. Alternatively, the length of information transmitted by the second message is unchanged, and since the identifier information is compressed from the first identifier to the second identifier, the service information can also be carried through the bits compressed away. For example, the first identifier is 40 bits, and the second identifier is 36 bits, and the 4 bits compressed away can be used to carry the service type information. Optionally, the service information can be indicated through a combination of reserved bits and compressed bits. Optionally, the service information can be included in the second message or can not be included in the second message but be sent through other messages.

[0314] Optionally, the core network device can further send service information to the access network device, which can indicate the calling information for triggering the second message (e.g., for triggering the core network device to send the second message), or the calling information of the service to be paged, or the calling information of the missed called service, etc. For example, the calling information can be a phone number, or the calling information can be used by the UE to determine the calling number, or the calling information can be used by the UE to determine whether it is a number previously stored with the network device. Optionally, the service information can also be indicated by the reserved bits in the second message. For example, there are 2 bits reserved in the second message, which can be used to indicate 4 pre-stored calling numbers. Alternatively, the information length of the second message is unchanged, and since the identification information is compressed from the first identification to the second identification, the service information can also be carried by the bits compressed out. For example, the first identification is 40 bits, and the second identification is 36 bits, and the 4 bits compressed out can be used to carry the calling information of the service, which can be used to indicate 16 pre-stored calling numbers. Alternatively, the 4 bits compressed out can be used to indicate 15 pre-stored calling numbers, and indicate that the calling information is not pre-stored. Optionally, the reserved bits and the compressed bits can be used in combination to indicate the calling information. Optionally, the service information can be included in the second message, or can not be included in the second message, but sent through other messages.

[0315] S504, the access network device determines the second identification of the first UE. The second identification of the first UE can be used by the access network device to find the first UE.

[0316] The access network device can determine the second identification of the first UE according to the second information and / or the first identification of the first UE, etc., which will be described below.

[0317] As an optional implementation of the access network device determining the second identification of the first UE, the access network device can determine the second identification of the first UE according to the first identification of the first UE. Optionally, the second identification is the first identification, i.e., the access network device can take the first identification of the first UE from the core network device as the second identification of the first UE. For example, the first identification includes an identification allocated by the core network device to the first UE according to the information of the access network device (e.g., the second information), and the length of the first identification can be shorter than the length of the P-TMSI of the first UE. In this case, it can be considered that the first identification sent by the core network device has considered how to distinguish different UEs in the same PO, and has also considered removing the bits in the second identification that are not used to distinguish different UEs in the same PO, so the access network device can take the first identification as the second identification without additional processing, which can simplify the processing process of the access network device.

[0318] As another optional implementation of determining the second identity of the first UE by the access network device, the access network device can determine the second identity of the first UE according to the second information and the first identity of the first UE. Optionally, the second identity is different from the first identity, for example, the length of the second identity is shorter than the length of the first identity. The first identity of the first UE, for example, includes the P-TMSI of the first UE, and the second identity determined by the access network device, for example, includes part of the bits of the P-TMSI. For example, the access network device can remove part of the bits from the first identity according to the second information, and the remaining bits of the first identity can be used as the second identity. Alternatively, the length of the second identity determined by the access network device can be shorter than the P-TMSI, but the second identity can be allocated by the access network device for the UE, and not be obtained by intercepting the P-TMSI.

[0319] For example, the length of the P-TMSI of the UE in a certain area is 32 bits, which can cover 9 decimal digits, and 32 bits can cover all UEs in the area. The access network device can determine the length of the second identity according to the second information, such as the number of control channels and / or the information of the paging group. For example, according to the second information, there are 2 2 = 4 control channels, and there are 2 5 = 32 enhanced paging groups, the access network device determines that 2 bits for indicating the control channel and 5 bits for indicating the enhanced paging group are not used to distinguish different UEs in the same PO (for example, for different UEs in the same PO, the values of the 7 bits corresponding to the P-TMSI of the UEs can be the same), and therefore the access network device can determine that the second identity occupies 32-7 = 25 bits. Then, the access network device can remove 7 bits from the P-TMSI, and the remaining bits of the P-TMSI are used as the second identity. The specific bits removed from the P-TMSI can be determined by the access network device according to the meaning of each bit in the P-TMSI (for example, bits not used to distinguish different UEs in the same PO are removed), or predefined according to the protocol. Alternatively, the access network device can newly generate a second identity with a length of 25 bits, without intercepting the P-TMSI, as long as the second identity can be used to distinguish different UEs in a PO.

[0320] As another optional implementation of determining the second identity of the first UE by the access network device, the access network device can determine the second identity of the first UE according to the second information. In this way, the access network device can not necessarily know the first identity of the first UE, and therefore, S503 can be an optional step. However, the access network device determines the second identity according to the second information, which can include different implementations. For example, one optional implementation includes that the access network device can determine the G-RNTI of the first UE, and according to the G-RNTI and the second information, the second identity of the first UE can be determined. The second identity determined by the access network device includes, for example, part of the bits of the G-RNTI, for example, the access network device can remove part of the bits from the G-RNTI according to the second information, and the remaining bits of the G-RNTI can be used as the second identity. For example, the length of the G-RNTI of the UE in a certain area is 32 bits, which can cover 9 decimal digits, and 32 bits can cover all UEs in the area. The access network device can determine the length of the second identity according to the second information, such as the number of control channels and / or the information of the paging group. For example, according to the second information, there are 2 2 = 4 control channels, and there are 2 5 = 32 enhanced paging groups, the access network device determines that 2 bits used to indicate the control channels and 5 bits used to indicate the enhanced paging groups are not used to distinguish different UEs in the same PO (for example, for different UEs in the same PO, the values of the 7 bits corresponding to the G-RNTI of the UEs can be the same), and therefore, the access network device can determine that the second identity occupies 32-7 = 25 bits. Then, the access network device can remove 7 bits from the G-RNTI, and the remaining bits of the G-RNTI can be used as the second identity. The specific bits removed from the G-RNTI can be determined by the access network device according to the meanings of the bits in the G-RNTI (for example, the bits not used to distinguish different UEs in the same PO are removed), or predefined according to the protocol.

[0321] Alternatively, in another implementation of determining the second identity by the access network device according to the second information, the access network device can determine the second identity without the aid of the G-RNTI. For example, the access network device can determine how many bits are needed to distinguish different UEs in different POs in an area, for example, 25 bits, and then the access network device can determine that the length of the second identity is 25 bits. The access network device can allocate a second identity with a length of 25 bits to the UE (for example, the first UE), which is newly allocated and does not necessarily rely on the G-RNTI or other identity of the UE. For example, the length of the second identity of the first UE can be shorter than the length of the first identity of the first UE.

[0322] For example, the access network device can allocate at least one second identifier for the first UE, and different second identifiers correspond to different services, for example, part or all bits in the second identifier can indicate the type of service arrived at the first UE. Optionally, in this allocation manner, the length of the second identifier can be equal to the second threshold, but more information (for example, the type of service information) can be carried by the second identifier than the first identifier. For example, the length of the second identifier allocated by the access network device for the first UE is 32 bits, and the low 2 bits can represent the type of the current called service (for example, the type of service arrived at the first UE). The first UE can learn that the first UE is paged according to the high 30 bits in the 32 bits, and can learn the type of service arrived at the first UE (for example, data service, voice service, or short message service, etc.) according to the low 2 bits.

[0323] Wherein, the access network device can send the second identifier to the first UE after determining the second identifier of the first UE, and the first UE receives the second identifier, without the need to determine the second identifier by itself.

[0324] Alternatively, the access network device and the first UE can determine the first identifier respectively, and the access network device and the first UE can determine the first identifier in the same or similar manner. For example, the access network device can intercept the first identifier (for example, P-TMSI) of the first UE from the core network device to obtain the second identifier; the first UE can also intercept the first identifier (for example, P-TMSI) of the first UE to obtain the second identifier, and the access network device and the first UE can adopt the same interception manner. For example, the core network device can intercept the P-TMSI of the first UE to obtain the first identifier, and then send the first identifier to the access network device, and the access network device can take the first identifier as the second identifier of the first UE; the first UE can also intercept the first identifier (for example, P-TMSI) of the first UE to obtain the second identifier, and the core network device and the first UE can adopt the same interception manner. For example, the access network device can intercept the G-RNTI of the first UE to obtain the first identifier; the first UE can also intercept the G-RNTI of the first UE to obtain the second identifier, and the access network device and the first UE can adopt the same interception manner.

[0325] S505, the access network device sends the first message. Correspondingly, the first UE receives the first message. The first message can be used to page the first UE, or indicate that the first UE has arrived service or indicate that the first UE has missed the called service, etc.

[0326] Optionally, the access network device can determine the receiving occasion corresponding to the first UE according to the second information and / or the third identifier of the first UE, and send the first message at the receiving occasion. The first UE can also determine the receiving occasion corresponding to the first UE according to the same or similar manner, so that the first UE can detect the first message at the receiving occasion. For details of the determination manner of the receiving occasion of the first message, refer to S502.

[0327] The first message can include the second identifier of the first UE, and the second identifier can be used to identify the first UE. Optionally, the first message can also include service indication information, which can indicate the called service of the first UE, or indicate the service arrived at the first UE, and the network can send the message to find the first UE because of the service. Alternatively, the service indication information can indicate that the first UE has failed in the called service (or the arrived service), and optionally, in this case, the core network device can also generate a message including the information of the service (for example, including the information of the called number), and wait until the first UE enters the RRC connected state or after entering the RRC connected state (for example, the first UE enters the RRC connected state according to the first message, or subsequently initiates the service by the user to make the first UE enter the RRC connected state, etc.), and then send the message including the information of the service to the first UE. For example, the service arrived at the first UE is a voice service, or the service arrived at the first UE is a short message service, or the service arrived at the first UE is a data service, etc. Alternatively, the service indication information can indicate that the current system information has changed. If the system information has changed, the UE can not continue to receive the service, such as receiving the enhanced paging service, if the UE does not receive the updated system information in time. Therefore, if the system information has changed, the UE can receive the updated system information in time. Optionally, if the core network device sends the service information to the access network device, the service indication information can be determined according to the service information; or if the core network device does not send the service information, the service indication information can be determined by the access network device.

[0328] The first UE can determine that there is a service arrival or a missed called service according to the second identifier included in the first message, or the first UE can determine that there is a service arrival or a missed called service according to the first message including the second identifier of the first UE. Optionally, if the first message includes service indication information, the first UE can prompt the user according to the service indication information. For example, the service indication information indicates that the system information has changed, and the first UE can prompt the user that the subsequent service cannot be continuously received and needs to be reacquired. For another example, the service indication information indicates that there is a voice service arrival, and the first UE can prompt the user that there is a called voice service arrival and needs to be received after the satellite is acquired. For another example, the service indication information indicates that a voice called service is missed, and the first UE can prompt the user that a called voice service is missed. The first UE can prompt the user in various ways such as outputting audio information, video information, picture information, or text information, and the like, and no limitation is made herein.

[0329] In the embodiments of the present application, if the terminal device is in an RRC non-connected state, the network device can page the terminal device or prompt the terminal device that there is a service arrival through the first message, so that the terminal device can start to transmit the service after receiving the first message, and the success rate of service transmission is improved. Or the network device can prompt the terminal device that a called service is missed through the first message, so that the terminal device can prompt the user that the missed service, thereby prompting the user to make a voice callback or message acquisition, and avoiding that the user misses important information. In addition, the first message can include the second identifier of the terminal device, and the number of bits occupied by the second identifier can be less than or equal to the second threshold. The embodiments of the present application can save signaling overhead by reducing the length of the identifier, or the embodiments of the present application can carry more information by the unchanged length of the identifier. Optionally, since the overhead of the first message is small, it is more conducive to improve the coverage of the first message. For example, the network device can send the first message multiple times to achieve a better effect of prompting the terminal device.

[0330] FIG. 6 shows a structural schematic diagram of a communication apparatus provided by the embodiments of the present application. The communication apparatus 600 can be the first UE or the circuit system of the first UE in the embodiments shown in any one of FIGS. 2 to 5, for implementing the method corresponding to the first UE in the above method embodiments. Or the communication apparatus 600 can be the access network device or the circuit system of the access network device in the embodiments shown in any one of FIGS. 2 to 5, for implementing the method corresponding to the access network device in the above method embodiments. Or the communication apparatus 600 can be the core network device or the circuit system of the core network device in the embodiments shown in any one of FIGS. 2 to 5, for implementing the method corresponding to the core network device in the above method embodiments. For example, one circuit system is a chip system.

[0331] The communication apparatus 600 comprises at least one processor 601. The processor 601 can be used for internal processing of the apparatus, and implements certain control processing functions. Optionally, the processor 601 comprises instructions. Optionally, the processor 601 can store data. Optionally, different processors can be independent devices, can be located in different physical positions, and can be located on different integrated circuits. Optionally, different processors can be integrated in one or more processors, for example, integrated on one or more integrated circuits.

[0332] Optionally, the communication apparatus 600 comprises one or more memories 603 for storing instructions. Optionally, the memory 603 can also store data. The processor and the memory can be separately arranged, or integrated together.

[0333] Optionally, the communication apparatus 600 comprises a communication line 602 and at least one communication interface 604. Since the memory 603, the communication line 602 and the communication interface 604 are all optional, they are all represented by dashed lines in FIG. 6.

[0334] Optionally, the communication apparatus 600 can further comprise a transceiver and / or an antenna. The transceiver can be used to send information to other apparatuses or receive information from other apparatuses. The transceiver can be referred to as a transceiver, a transceiver circuit, an input / output interface, etc., and is used to realize the transceiving function of the communication apparatus 600 through the antenna. Optionally, the transceiver comprises a transmitter and a receiver. Illustratively, the transmitter can be used to generate a radio frequency signal from a baseband signal, and the receiver can be used to convert a radio frequency signal into a baseband signal.

[0335] The processor 601 can comprise a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs of the solutions of the present application.

[0336] The communication line 602 can comprise a path for transmitting information between the above-mentioned components.

[0337] The communication interface 604 uses any transceiver-like device for communicating with other devices or communication networks, such as an Ethernet, a radio access network (RAN), a wireless local area networks (WLAN), a wired access network, etc.

[0338] The memory 603 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), or other type of dynamic storage device that can store information and instructions for execution by the processor 601, and can be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magnetic disk storage or other magnetic storage devices, or any other medium capable of storing instructions or data that can be accessed by a computer, but is not limited to this. The memory 603 can exist independently, and be connected to the processor 601 through the communication line 602. Alternatively, the memory 603 can be integrated with the processor 601.

[0339] The memory 603 is configured to store computer-executable instructions for implementing the solutions of the present application, and the processor 601 is configured to control the execution of the computer-executable instructions stored in the memory 603. The processor 601 is configured to execute the steps performed by the first UE or the access network device or the core network device in the embodiments shown in any one of FIGS. 2 to 5 by executing the computer-executable instructions stored in the memory 603.

[0340] Optionally, the computer-executable instructions in the embodiments of the present application can also be referred to as application program codes, and the embodiments of the present application are not limited in this regard.

[0341] In a specific implementation, as an embodiment, the processor 601 can include one or more CPUs, such as CPU0 and CPU1 in FIG. 6.

[0342] In a specific implementation, as an embodiment, the communication apparatus 600 can include multiple processors, such as the processor 601 and the processor 605 in FIG. 6. Each of these processors can be a single-CPU processor or a multi-CPU processor. The processor herein can refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0343] When the apparatus shown in FIG. 6 is a chip, for example, a chip of the first UE or a chip of the access network device or a chip of the core network device, the chip includes the processor 601 (and can also include the processor 605), the communication line 602, and the communication interface 604, and optionally, the memory 603. Specifically, the communication interface 604 can be an input interface, a pin, or a circuit, etc. The memory 603 can be a register, a cache, etc. The processor 601 and the processor 605 can be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits for executing programs for controlling the communication method of any of the above embodiments.

[0344] The embodiments of the present application can divide the functions of the apparatus according to the above method examples, for example, each function module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be realized in the form of hardware or in the form of a software function module. It should be noted that the division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. When each function module is divided according to each function, FIG. 7 is a schematic diagram of an apparatus 700, which can be the first UE or the access network device or the core network device involved in each of the above method embodiments, or a chip in the first UE or a chip in the access network device or a chip in the core network device. The apparatus 700 includes a processing unit 702 and a transceiver unit 701.

[0345] It should be understood that the apparatus 700 can be used to implement the steps performed by the first UE or the access network device or the core network device in the communication method of the embodiments of the present application. The related features can be referred to the embodiments shown in any of FIG. 2 to FIG. 5, which will not be described here.

[0346] Optionally, the functions / implementation processes of the transceiver unit 701 and the processing unit 702 in FIG. 7 can be realized by the processor 601 in FIG. 6 invoking computer execution instructions stored in the memory 603. Alternatively, the functions / implementation processes of the processing unit 702 in FIG. 7 can be realized by the processor 601 in FIG. 6 invoking computer execution instructions stored in the memory 603, and the functions / implementation processes of the transceiver unit 701 in FIG. 7 can be realized by the communication interface 604 in FIG. 6.

[0347] Optionally, when the apparatus 700 is a chip or a circuit, the functions / implementation processes of the transceiver unit 701 can also be implemented through pins or circuits, etc. Optionally, the transceiver unit 701 can include a sending unit and / or a receiving unit, the sending unit is used to implement the sending function, and the receiving unit is used to implement the receiving function; or the transceiver unit 701 can be an integral module, which can implement the sending function and / or the receiving function. Optionally, the transceiver unit 701 can be implemented through a transceiver.

[0348] The application further provides a computer readable storage medium, which stores a computer program or instructions, when the computer program or instructions are executed, the method executed by the first UE or the access network device or the core network device in the foregoing method embodiments is implemented. In this way, the functions described in the above embodiments can be implemented in the form of software function units and sold or used as independent products. Based on this understanding, the technical solutions of the application can be embodied in the form of software products in essence or the part that contributes or the part of the technical solutions. The computer software product is stored in a storage medium and includes a plurality 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 the embodiments of the application. The storage medium includes a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media that can store program codes.

[0349] The application further provides a computer program product, which includes computer program codes, when the computer program codes are executed on a computer, the computer is caused to execute the method executed by the first UE or the access network device or the core network device in any of the foregoing method embodiments.

[0350] The embodiments of the application further provide a processing apparatus, which includes a processor and an interface; the processor is used to execute the method executed by the first UE or the access network device or the core network device related to any of the foregoing method embodiments.

[0351] In the embodiments described above, all or some of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or some of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded into and executed by a computer, all or some of the procedures or functions described in the embodiments of the present application are performed. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from a website, a computer, a server or a data center to another website, computer, server or data center through a wired (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media sets. The available media can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state disk (SSD)) and the like.

[0352] The various illustrative logical blocks, modules, circuits, and algorithms described in connection with the embodiments disclosed herein can be implemented or performed by a general purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the described functions. The general purpose processor can be a microprocessor, optionally, the general purpose processor can also be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other similar configuration.

[0353] The steps of methods or algorithms described in the embodiments of the present application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. The software unit can be stored in a RAM, a flash memory, a ROM, an erasable programmable read-only memory (EPROM), an EEPROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium in the art. The storage medium can be connected to the processor, so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and the storage medium can be located in an ASIC, which can be located in the terminal device. Alternatively, the processor and the storage medium can also be located in different components of the terminal device.

[0354] These computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operations steps to be performed on the computer or other programmable data processing device to generate a computer implemented process, so that the instructions executed on the computer or other programmable data processing device provide the steps for implementing the functions specified in one or more flows of the flowchart and / or one or more blocks of the block diagram.

[0355] The contents of various embodiments of the present application can be mutually referred to, and the terms and / or descriptions between different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0356] It can be understood that, in the embodiments of the present application, the first UE and / or the access network device and / or the core network device can perform some or all of the steps in the embodiments of the present application, and these steps or operations are only examples, and other operations or various modifications of the operations can also be performed in the embodiments of the present application. In addition, each step can be performed in a different order from that presented in the embodiments of the present application, and it is possible that not all the operations in the embodiments of the present application are performed.

Claims

1. A communication method characterized by comprising: The method comprises: determining a second identifier of the terminal device according to a first identifier of the terminal device, the second identifier occupying a smaller number of bits than the first identifier; sending a first message, the first message being used for paging the terminal device, or being used for prompting the terminal device that there is service arrival, or being used for prompting the terminal device that a called service is missed, wherein the first message comprises the second identifier.

2. The method of claim 1, wherein, The method comprises: determining a second identifier of the terminal device according to a first identifier of the terminal device, the second identifier occupying a smaller number of bits than the first identifier; determining the second identifier according to the first identifier, and first information and / or second information.

3. The method according to claim 2, wherein: the second identifier comprises all or part of bits in the first identifier except high M2 bits; or the second identifier comprises all or part of bits in the first identifier except high M2 bits, and further comprises M3 bits, wherein the M3 bits are of a first value, the first value is used for indicating a core network device to which the terminal device is registered, M2 and M3 are positive integers, and M3 is smaller than M2; wherein the high M2 bits are used for carrying an identifier of the core network device to which the terminal device is registered.

4. The method according to claim 3, wherein: the value of the M3 bits is used for indicating a core network device corresponding to the first cell, and the core network device to which the terminal device is registered is one of the core network devices corresponding to the first cell; or the value of the M3 bits is used for indicating a core network device corresponding to an access network device corresponding to the first cell, and the core network device to which the terminal device is registered is one of the core network devices corresponding to the access network device corresponding to the first cell.

5. The method according to claim 3 or 4, characterized in that, The M3 bits are located at a high bit or a low bit of the second identifier.

6. The method according to any one of claims 3 to 5, characterized in that, The method further comprises: sending first information, the first information being used for indicating an association between the value of the M3 bits and the core network device corresponding to the first cell, or indicating an association between the value of the M3 bits and the core network device corresponding to the access network device corresponding to the first cell.

7. The method according to any one of claims 2 to 6, characterized in that, The first information is information related to the core network device corresponding to the first cell, or information related to the core network device corresponding to the access network device corresponding to the first cell, wherein the first information is used for determining M3, and the first cell is a cell in which the terminal device is camped.

8. The method according to any one of claims 2 to 7, characterized in that, The second identifier comprises part or all of bits in the first identifier except low M1 bits.

9. The method of claim 8, wherein, The second information comprises a parameter related to a receiving occasion of the first message, wherein the second information is used for determining M1.

10. The method of claim 9, wherein, The parameter related to the receiving occasion of the first message comprises: a number of receiving frames included in a receiving period of the first message, and / or a number of receiving occasions corresponding to the terminal device included in one receiving frame; or a number of receiving occasions corresponding to the terminal device included in a receiving period of the first message.

11. The method of claim 10, wherein, M1 satisfies the following relationship: M1 = (log2N + log2N s ), Wherein, N represents the number of receiving frames included in the receiving period, N s represents the number of receiving occasions corresponding to the terminal device included in one receiving frame.

12. The method of claim 10, wherein, M1 satisfies the following relationship: M1=(log2X), X represents a number of receiving occasions corresponding to the terminal device included in the receiving period.

13. The method according to any one of claims 9 to 12, characterized in that, The method further includes: sending the second information.

14. The method according to any one of claims 1 to 13, characterized in that, The method further includes: receiving a first paging message from a core network device, the first paging message being used for paging the terminal device, wherein the first paging message includes the first identifier; or receiving a second message from a core network device, the second message being used for prompting the terminal device of arrival of service or the terminal device of missing of called service, wherein the second message includes the first identifier.

15. The method of claim 14, wherein the first paging message is further used for indicating that the terminal device has a capability of receiving a message used for prompting the terminal device of arrival of service or the terminal device of missing of called service; or the first paging message is further used for indicating that a message used for prompting the terminal device of arrival of service or the terminal device of missing of called service is sent to the terminal device.

16. The method according to any one of claims 1 to 15, characterized in that, The first message is used for paging the terminal device, and the method further includes: in a case where a response of the terminal device to the first message is not received, sending a third message, the third message being used for prompting the terminal device of arrival of service or the terminal device of missing of called service.

17. The method according to any one of claims 1 to 16, characterized in that, The method further includes: receiving auxiliary information from the terminal device; determining one or more of the following according to the auxiliary information: a signal quality of the terminal device is lower than a first threshold value, the terminal device is located at a cell edge, or the terminal device tends to receive a message used for prompting the terminal device of arrival of service or the terminal device of missing of called service.

18. A method of communication, comprising: The method includes: receiving a first message in a first cell; in a case where the first message includes a second identifier of a terminal device, entering a radio resource control (RRC) connected state or outputting a prompt message used for prompting the terminal device of arrival of service or the terminal device of missing of called service, wherein the second identifier is determined according to a first identifier of the terminal device, and a number of bits occupied by the second identifier is less than a number of bits occupied by the first identifier.

19. The method of claim 18, wherein, The method further includes: determining the second identifier according to the first identifier, and first information and / or second information.

20. The method of claim 18, wherein all or part of bits of the first identifier except high M2 bits are included in the second identifier; or all or part of bits of the first identifier except high M2 bits are included in the second identifier, and M3 bits are further included, wherein a value of the M3 bits is a first value, the first value is used for indicating a core network device to which the terminal device is registered, M2 and M3 are both positive integers, and M3 is less than M2; wherein the high M2 bits are used for carrying an identifier of a core network device to which the terminal device is registered.

21. The method of claim 20, wherein The value of the M3-bit is used to indicate the core network device corresponding to the first cell, and the core network device registered by the terminal device is one of the core network devices corresponding to the first cell. Or, The value of the M3-bit is used to indicate the core network device corresponding to the access network device corresponding to the first cell, and the core network device registered by the terminal device is one of the core network devices corresponding to the access network device corresponding to the first cell.

22. The method of claim 20 or 21, wherein, The M3-bit is located in the high bit or the low bit of the second identifier.

23. The method according to any one of claims 20 to 22, characterized in that, The method further comprises: receiving first information, the first information being used to indicate the association between the value of the M3-bit and the core network device corresponding to the first cell, or to indicate the association between the value of the M3-bit and the core network device corresponding to the access network device corresponding to the first cell.

24. The method according to any one of claims 19 to 23, characterized in that, The first information is information related to the core network device corresponding to the first cell, or information related to the core network device corresponding to the access network device corresponding to the first cell, wherein the first information is used to determine M3.

25. The method according to any one of claims 19 to 24, characterized in that, The second identifier includes part or all of the bits in the first identifier except the low M1-bit.

26. The method of claim 25, wherein, The second information includes a parameter related to the receiving occasion of the first message, wherein the second information is used to determine the M1.

27. A communications device, characterized by The communication device includes a module for performing the method of any one of claims 1-17, or a module for performing the method of any one of claims 18-26.

28. A communications device, characterized by The communication device includes a processor for performing the method of any one of claims 1-17, or performing the method of any one of claims 18-26.

29. A computer-readable storage medium, characterized in that, The computer readable storage medium is used to store a computer program, when the computer program is run on a computer, so that the method of any one of claims 1-17 is executed, or the method of any one of claims 18-26 is executed.

30. A computer program product, characterised in that, The computer program product includes a computer program, when the computer program is run on a computer, so that the computer executes the method of any one of claims 1-17, or the computer executes the method of any one of claims 18-26.

Images