CN113973358A

CN113973358A - Communication method and device

Info

Publication number: CN113973358A
Application number: CN202010725935.1A
Authority: CN
Inventors: 姚楚婷; 徐海博; 才宇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2022-01-25
Also published as: WO2022017235A1

Abstract

The application relates to a communication method and device. The first terminal equipment receives a first identifier, the first identifier is an identifier of second terminal equipment, the second terminal equipment provides relay service for the first terminal equipment, and the first identifier is used for determining the paging occasion of the second terminal equipment. The first terminal device sends a first message to the first core network device, wherein the first message comprises a first identifier, and the first message is used for requesting to update the identifier of the first terminal device according to the first identifier. And the first terminal equipment receives a second identifier from the first core network equipment, wherein the second identifier is the updated identifier of the first terminal equipment and is used for determining the paging occasion of the first terminal equipment. The paging time of the first terminal equipment can be aligned with the paging time of the second terminal equipment as much as possible, so that the second terminal equipment cannot wake up again in extra time due to monitoring the paging of the first terminal equipment, and the power consumption of the second terminal equipment is saved.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.

Background

At present, a terminal device may communicate with a base station through other terminal devices in addition to directly communicating with the base station. For example, in a public safety (public safety) scenario, a relay (relay) terminal device may act as a relay for a remote terminal device, so that the remote terminal device can communicate with a base station through the relay terminal device, which is referred to as a user equipment to network relay (UE 2NW relay) technology.

Under this technique, the remote terminal device can receive a page (paging) from the network through the relay terminal device. Specifically, the relay terminal device monitors paging for the remote terminal device in addition to monitoring paging of the relay terminal device, and sends the paging of the remote terminal device to the remote terminal device.

In order to monitor paging of the remote terminal, the relay terminal needs to monitor Paging Occasions (POs) of the remote terminal. However, the POs of the relay terminal device and the PO of the remote terminal device may be different, so the relay terminal device needs to wake up to monitor the paging of the remote terminal device in an extra time except for the PO of the relay terminal device, which increases the power consumption of the relay terminal device.

Disclosure of Invention

The embodiment of the application provides a communication method and device, which are used for reducing the power consumption of terminal equipment.

In a first aspect, a first communication method is provided, the method including: a first terminal device receives a first identifier from a second terminal device, wherein the first identifier is an identifier of the second terminal device, the second terminal device provides a relay service for the first terminal device, and the first identifier is used for determining a paging occasion of the second terminal device; the first terminal device sends a first message to a first core network device, the first message includes the first identifier, the first message is used for requesting to update the identifier of the first terminal device according to the first identifier, and the first core network device serves the first terminal device; and the first terminal equipment receives a second identifier from the first core network equipment, wherein the second identifier is an updated identifier of the first terminal equipment, and the second identifier is used for determining the paging occasion of the first terminal equipment.

The method may be performed by a first communication device, which may be a communication apparatus or a communication device, e.g. a chip, capable of supporting the communication apparatus to implement the functionality required for the method. Illustratively, the first communication device is a terminal device, or a chip provided in the terminal device for implementing a function of the terminal device, or another component for implementing a function of the terminal device. In the following description, the first communication device is taken as an example of a terminal device, for example, a first terminal device.

The PO of one terminal device is related to the identity of the terminal device, and if the identities of two terminal devices are different, the POs of the two terminal devices may be different. Therefore, in this embodiment of the present application, the first terminal device may request the first core network device to update the identifier of the first terminal device, because the first core network device updates the identifier of the first terminal device according to the identifier (e.g., the first identifier) of the second terminal device, a paging occasion determined according to the updated identifier (e.g., the second identifier) of the first terminal device may be the same as or may be closer to a paging occasion determined according to the first identifier in a time domain, and the like. If the two paging occasions are the same, the second terminal device can monitor the paging of the first terminal device and the paging of the second terminal device at the same paging occasion without monitoring at an additional paging occasion, which is beneficial to reducing the power consumption of the second terminal device; or, if the two paging occasions are relatively close in time domain, the second terminal device may not need to enter the sleep state after monitoring the paging of one terminal device, but may enter the sleep state after the paging of the other terminal device is monitored, because the paging occasions of the two terminal devices are relatively close in time domain, the power consumption caused by the waiting of the second terminal device may be smaller than the power consumption caused by the wake-up of the second terminal device after the sleep, and thus, the power consumption of the second terminal device may also be reduced.

With reference to the first aspect, in a first optional implementation manner of the first aspect, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

For a terminal device, if it needs to listen to paging at a certain PO, the terminal device wakes up at the PO and listens to paging. However, the terminal device may not immediately enter the sleep state when the PO ends, for example, the terminal device may perform other operations after waking up, such as measuring reference signals, etc., and thus the terminal device may continue to operate for a period of time after the PO ends and then enter the sleep state. Therefore, the first terminal device may send first range information to the first core network device, where the first range information may indicate a first range, where the first range is, for example, a value range of an identifier of the first terminal device (here, an identifier to be allocated by the first core network device), and if the identifier of the first terminal device belongs to the first range, a paging occasion determined according to the identifier of the first terminal device may be located in a wake-up time of the second terminal device, where, for example, the first identifier may belong to the first range; or, the first range is, for example, a range to which a time domain distance between a PO determined according to the first identifier and a PO determined according to an identifier of the first terminal device (here, an identifier to be allocated to the first core network device) belongs, and if the time domain distances of the two POs belong to the range, the PO of the first terminal device is located in a wake-up time of the second terminal device. Then, the first core network device may allocate a new identifier to the first terminal device according to the first identifier and the first range, so that the selection range when selecting the new identifier is larger, and the allocation is more flexible.

With reference to the first optional implementation manner of the first aspect, in a second optional implementation manner of the first aspect, the method further includes:

the first terminal device receives the first range information from the second terminal device.

The second terminal device is aware of the time when the second terminal device wakes up, so the first range can be determined by the second terminal device, and the first range can be more consistent with the actual working condition of the second terminal device. The second terminal device may send the first range information to the first terminal device after determining the first range information, so that the first terminal device may send the first range information to the first core network device.

With reference to the first optional implementation manner of the first aspect or the second optional implementation manner of the first aspect, in a third optional implementation manner of the first aspect, a paging occasion determined according to the first identifier is the same as a paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

For example, if the UE _ ID corresponding to the second identifier is the same as the UE _ ID corresponding to the first identifier, the paging occasion determined according to the first identifier may be the same as the paging occasion determined according to the second identifier, and then the second terminal device may monitor both the paging of the second terminal device and the paging of the first terminal device in the same paging occasion, and does not need to wake up in extra time to monitor the paging for the first terminal device, which can reduce the power consumption of the second terminal device. Or, although the UE _ ID corresponding to the first identifier is different from the UE _ ID corresponding to the first identifier, the second identifier belongs to the first range, or the time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier belongs to the first range (or the first core network device is the second identifier determined according to the first range and the first identifier), then the second terminal device only needs to wake up once to monitor paging for the two terminal devices, and does not need to wake up for multiple times to monitor paging, and the power consumption of the second terminal device can be reduced by this way.

With reference to the first aspect or any optional implementation manner of the first aspect to the third optional implementation manner of the first aspect, in a fourth optional implementation manner of the first aspect, the first message further includes a first cause value, and the first cause value is used to indicate that the first terminal device is a far-end terminal device.

The first message may further include a first cause value, where the first cause value may indicate that the first terminal device is a far-end terminal device, or in other words, indicate that the second terminal device provides the relay service for the first terminal device, and therefore the first terminal device needs to set the identifier of the first terminal device according to the identifier (i.e., the first identifier) of the second terminal device. In this way, the first core network device can clearly update the identifier for the first terminal device.

With reference to the first aspect or any one of the first to fourth alternative embodiments of the first aspect, in a fifth alternative embodiment of the first aspect, the method further comprises:

the first terminal equipment receives a first cycle from the second terminal equipment, wherein the first cycle is a DRX cycle of the second terminal equipment;

and when the length of the second period is smaller than that of the first period, the first terminal equipment sends a second message to the second terminal equipment, wherein the second message comprises the second period, and the second period is the DRX period of the first terminal equipment.

The first terminal device may determine a magnitude relationship of a second cycle and the first cycle if the first cycle is received by the first terminal device, the second cycle being a DRX cycle of the first terminal device. If the second cycle is greater than or equal to the first cycle, the second terminal device does not need to know the DRX cycle of the first terminal device, and the second terminal device can monitor the paging of the first terminal device as long as it monitors the paging according to the first cycle, so in this case, the first terminal device may not transmit the DRX cycle of the first terminal device (i.e., the second DRX cycle) to the second terminal device. Alternatively, if the second cycle is smaller than the first cycle, i.e. the DRX cycle of the remote terminal device is smaller than the DRX cycle of the relay terminal device, in which case the second terminal device may miss some pages if it does not know the DRX cycle of the first terminal device but monitors pages for the first terminal device according to the first cycle. For example, the first period is 1.28 seconds, the second period is 640 milliseconds, the core network device pages the first terminal device at 640 millisecond intervals, and if the second terminal device listens every 1.28 seconds, the paging of the first terminal device may be missed. Thus, if the second period is less than the first period, the first terminal device may transmit the second period to the second terminal device to reduce the probability that the second terminal device misses the page of the first terminal device.

With reference to the fifth optional implementation manner of the first aspect, in a sixth optional implementation manner of the first aspect, the second message is further used to indicate that the length of the DRX cycle is modified to the length of the second cycle.

The second message may also indicate to modify the length of the DRX cycle to the length of the second cycle, and the second terminal device may then negotiate with the second core network device to change the DRX cycle of the second terminal device. Therefore, the second terminal equipment can monitor the paging of the second terminal equipment and the paging of the first terminal equipment according to the same DRX period, does not need to work according to various DRX periods, and is beneficial to unifying the behaviors of the second terminal equipment.

With reference to the first aspect or any optional implementation manner of the first aspect to the sixth optional implementation manner of the first aspect, in a seventh optional implementation manner of the first aspect, the second identifier is carried in a configuration update message or a registration completion message.

The first core network device sends the second identifier to the first terminal device, and the second identifier can be sent through different messages. For example, the first terminal device previously sent a registration request message to the first core network device (e.g., the first message is a registration request message), and then the first core network device may send the second identifier carried in a registration completion message to the first terminal device. Or, no matter whether the first terminal device sends the registration request message to the first core network device in advance, the first core network device may send the second identifier carried in the configuration update message to the first terminal device. Or, the first core network device may also send the second identifier to the first terminal device through another message.

With reference to the first aspect or any one of the first to seventh optional embodiments of the first aspect, in an eighth optional embodiment of the first aspect, the method further comprises:

and the first terminal equipment sends the second identifier to the second terminal equipment, and the second identifier is used for the second terminal equipment to monitor paging for the first terminal equipment.

After obtaining the second identifier, the first terminal device may send the second identifier to the second terminal device. In this way, when monitoring paging for the first terminal device, the second terminal device may determine whether the paging message includes the second identifier if the paging message is monitored, and if the second identifier is included, it indicates that the first terminal device is paged, the second terminal device may send the paging message to the first terminal device, and if the paging message does not include the second identifier, it indicates that the first terminal device is not paged, the second terminal device may not have to send the paging message to the first terminal device, for example, the second terminal device may discard the paging message. By the method, information interaction between the second terminal equipment and the first terminal equipment can be reduced, transmission overhead is saved, redundant information received by the first terminal equipment can be reduced, and effectiveness of the information received by the first terminal equipment is improved.

With reference to the first aspect or any optional implementation manner of the first aspect to the eighth optional implementation manner of the first aspect, in a ninth optional implementation manner of the first aspect, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device, where mod represents a modulo operation.

The first identifier may be (5G-S-TMSI mod 1024) of the second terminal device, or the first identifier may also be 5G-S-TMSI of the second terminal device, etc., as long as the paging occasion of the second terminal device can be determined according to the first identifier.

With reference to the first aspect or any one of the first to ninth optional embodiments of the first aspect, in a tenth optional embodiment of the first aspect, the method further comprises:

a first terminal device sends a request message to an access network device, wherein the request message is used for requesting to enter an RRC non-connection state;

receiving an acknowledgement message from the access network device, wherein the acknowledgement message is used for indicating the first terminal device to enter an RRC non-connected state.

The RRC non-connected state is, for example, an RRC idle state or an RRC inactive state. Monitoring paging is generally an action that may be taken when a terminal device is in an RRC non-connected state, so that a first terminal device may enter the RRC non-connected state, and a second terminal device may monitor paging for the first terminal device.

In a second aspect, a second communication method is provided, the method comprising: a second terminal device sends a first identifier to a first terminal device, wherein the first identifier is an identifier of the second terminal device, the second terminal device provides a relay service for the first terminal device, and the first identifier is used for determining a paging occasion of the second terminal device; and the second terminal equipment receives a second identifier from the first terminal equipment, wherein the second identifier is the identifier of the first terminal equipment, the second identifier is determined according to the first identifier, and the second identifier is used for determining the paging occasion of the first terminal equipment.

The method may be performed by a second communication device, which may be a communication apparatus or a communication device, e.g. a chip, capable of supporting the communication apparatus to perform the functions required by the method. Illustratively, the second communication device is a terminal device, or a chip provided in the terminal device for implementing the function of the terminal device, or another component for implementing the function of the terminal device. In the following description, the second communication device is taken as an example of a terminal device, for example, a second terminal device.

With reference to the second aspect, in a first optional implementation manner of the second aspect, the method further includes:

and the second terminal equipment sends first range information to the first terminal equipment, wherein the first range information is used for indicating a first range, and the first range is a value range of the identifier of the first terminal equipment or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

With reference to the second aspect or the first optional implementation manner of the second aspect, in a second optional implementation manner of the second aspect, a paging occasion determined according to the first identifier is the same as a paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

With reference to the second aspect or the first alternative implementation of the second aspect or the second alternative implementation of the second aspect, in a third alternative implementation of the second aspect, the method further comprises:

the second terminal equipment determines a paging occasion according to the second identifier;

and the second terminal equipment monitors paging for the first terminal equipment according to the paging occasion.

With reference to the second aspect or any one of the first optional implementation manner of the second aspect to the third optional implementation manner of the second aspect, in a fourth optional implementation manner of the second aspect, the method further includes:

the second terminal equipment sends a first period to the first terminal equipment, wherein the first period is the period of the second terminal equipment;

and the second terminal equipment receives a second message from the first terminal equipment, wherein the second message comprises a second period, the second period is a DRX period of the first terminal equipment, and the length of the second period is smaller than that of the first period.

With reference to the fourth optional implementation manner of the second aspect, in a fifth optional implementation manner of the second aspect, the second message is further used to instruct to modify the length of the DRX cycle to the length of the second cycle.

With reference to the fourth alternative embodiment of the second aspect or the fifth alternative embodiment of the second aspect, in a sixth alternative embodiment of the second aspect, the method further includes:

the second terminal device and a second core network device negotiate a DRX cycle of the second terminal device, wherein the negotiated DRX cycle length of the second terminal device is the same as the length of the second cycle, and the second core network device serves the second terminal device.

With reference to the second aspect or any optional implementation manner of the first optional implementation manner of the second aspect to the sixth optional implementation manner of the second aspect, in a seventh optional implementation manner of the second aspect, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device, where mod represents a modulo operation.

With regard to the technical effects brought about by the second aspect or various alternative embodiments of the second aspect, reference may be made to the introduction to the technical effects of the first aspect or the respective embodiments.

In a third aspect, a third method of communication is provided, the method comprising: a second terminal device receives a first identifier from a first terminal device, wherein the first identifier is the identifier of the first terminal device, and the first identifier is used for determining a paging occasion of the first terminal device; the second terminal device sends a first message to a second core network device, the first message includes the first identifier, the first message is used for requesting to update the identifier of the second terminal device according to the first identifier, and the second core network device serves the second terminal device; and the second terminal equipment receives a second identifier from the second core network equipment, wherein the second identifier is an updated identifier of the second terminal equipment, and the second identifier is used for determining the paging occasion of the second terminal equipment.

The method may be performed by a third communication device, which may be a communication apparatus or a communication device, such as a chip, capable of supporting a communication apparatus to implement the functions required by the method. Illustratively, the third communication device is a terminal device, or a chip provided in the terminal device for implementing the function of the terminal device, or another component for implementing the function of the terminal device. In the following description, the third communication device is a terminal device, for example, a second terminal device.

In this embodiment of the present application, the second terminal device (relay terminal device) may request the second core network device to update the identifier of the second terminal device, because the second core network device updates the identifier of the second terminal device according to the identifier (e.g., the first identifier) of the first terminal device, a paging occasion determined according to the updated identifier (e.g., the second identifier) of the second terminal device may be the same as or may be closer to the paging occasion determined according to the first identifier in a time domain, and the like. If the two paging occasions are the same, the second terminal device can monitor the paging of the first terminal device and the paging of the second terminal device at the same paging occasion without monitoring at an additional paging occasion, which is beneficial to reducing the power consumption of the second terminal device; or, if the two paging occasions are relatively close in time domain, the second terminal device may not need to enter the sleep state after monitoring the paging of one terminal device, but may enter the sleep state after the paging of the other terminal device is monitored, because the paging occasions of the two terminal devices are relatively close in time domain, the power consumption caused by the waiting of the second terminal device may be smaller than the power consumption caused by the wake-up of the second terminal device after the sleep, and thus, the power consumption of the second terminal device may also be reduced. Therefore, in the embodiment of the application, the identifier can be updated by the remote terminal device, and also can be updated by the relay terminal device, so that the method is flexible.

With reference to the third aspect, in a first optional implementation manner of the third aspect, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the second terminal device, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

For a terminal device, if it needs to listen to paging at a certain PO, the terminal device wakes up at the PO and listens to paging. However, the terminal device may not immediately enter the sleep state when the PO ends, for example, the terminal device may perform other operations after waking up, such as measuring reference signals, etc., and thus the terminal device may continue to operate for a period of time after the PO ends and then enter the sleep state. The time when the second terminal device wakes up is known to the second terminal device, and therefore, as an alternative implementation, the second terminal device may determine a range, for example, referred to as a first range, and may send the first range information to the second core network device. The first range is, for example, a value range of an identifier of the first terminal device (here, an identifier to be allocated to the first core network device), and if the identifier of the first terminal device belongs to the first range, the paging occasion determined according to the identifier of the first terminal device is located in a wake-up time of the second terminal device, for example, the first identifier may belong to the first range; or, the first range is, for example, a range to which a time domain distance between a PO determined according to the first identifier and a PO determined according to an identifier of the first terminal device (here, an identifier to be allocated to the first core network device) belongs, and if the time domain distances of the two POs belong to the range, the PO of the first terminal device is located in a wake-up time of the second terminal device. The second core network device can allocate a new identifier to the second terminal device according to the first identifier and the first range information, and due to the existence of the first range information, the second core network device has a larger range for selecting the new identifier, the selection is more flexible, and the selection success rate can be improved.

With reference to the third aspect or the first optional implementation manner of the third aspect, in a second optional implementation manner of the third aspect, the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

With reference to the third aspect, or the first optional implementation manner of the third aspect, or the second optional implementation manner of the third aspect, in a third optional implementation manner of the third aspect, the first message further includes a first cause value, and the first cause value is used to indicate that the second terminal device is a relay terminal device.

The first message may further include a first cause value, where the first cause value may indicate that the second terminal device is the relay terminal device, or in other words, indicate that the second terminal device provides the relay service for the first terminal device, and therefore the second terminal device needs to set the identifier of the second terminal device according to the identifier (i.e., the first identifier) of the first terminal device. In this way, the second core network device can clearly update the identifier for the second terminal device.

With reference to the third aspect or any optional implementation manner of the first optional implementation manner of the third aspect to the third optional implementation manner of the third aspect, in a fourth optional implementation manner of the third aspect, the second identifier is carried in a configuration update message or carried in a registration completion message.

The second core network device sends the second identifier to the second terminal device, and the second identifier can be sent through different messages. For example, the second terminal device previously sent the registration request message to the second core network device (e.g., the second message is the registration request message), and then the second core network device may send the second identifier carried in the registration completion message to the second terminal device. Or, no matter whether the second terminal device sends the registration request message to the second core network device in advance, the second core network device may send the second identifier carried in the configuration update message to the second terminal device. Or, the second core network device may also send the second identifier to the second terminal device through another message.

With reference to the third aspect or any optional implementation manner of the first optional implementation manner to the fourth optional implementation manner of the third aspect, in a fifth optional implementation manner of the third aspect, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device, where mod represents a modulo operation.

The first identifier may be (5G-S-TMSI mod 1024) of the first terminal device, or the first identifier may also be 5G-S-TMSI of the first terminal device, etc., as long as the paging occasion of the first terminal device can be determined according to the first identifier.

With reference to the third aspect or any one of the first optional implementation manner to the fifth optional implementation manner of the third aspect, in a sixth optional implementation manner of the third aspect, the method further includes:

the second terminal equipment determines a paging occasion according to the first identifier;

The second terminal device can determine a paging occasion according to the first identifier and monitor paging for the first terminal device according to the paging occasion. Since the second identifier is also determined according to the first identifier, the paging occasion of the second terminal device may be the same as the paging occasion of the first terminal device, or the distance in the time domain may also be smaller than the first threshold, thereby reducing power consumption of the second terminal device due to listening to paging for the first terminal device.

In a fourth aspect, a communication device is provided, for example, the communication device is the first communication device as described above. The first communication device is configured to perform the method of the first aspect or any possible implementation. In particular, the first communication device may include means for performing the method of the first aspect or any possible implementation manner, for example, a processing means, and optionally, a transceiver means. For example, the transceiver module may include a transmitting module and a receiving module, and the transmitting module and the receiving module may be different functional modules, or may also be the same functional module, but can implement different functions. Illustratively, the first communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device, such as a first terminal device. In the following, the first communication apparatus is taken as an example of the first terminal device. For example, the transceiver module may also be implemented by a transceiver, and the processing module may also be implemented by a processor (or a processing circuit). Alternatively, the sending module may be implemented by a sender, the receiving module may be implemented by a receiver, and the sender and the receiver may be different functional modules, or may also be the same functional module, but may implement different functions. If the first communication means is a communication device, the transceiver is implemented, for example, by an antenna, a feeder, a codec, etc. in the communication device. Alternatively, if the first communication device is a chip disposed in the communication apparatus, the transceiver (or the transmitter and the receiver) is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component. In the introduction process of the fourth aspect, the description is continued by taking the first communication apparatus as a first terminal device, and taking the processing module, the sending module, and the receiving module as an example. Wherein the content of the first and second substances,

the receiving module is configured to receive a first identifier from a second terminal device, where the first identifier is an identifier of the second terminal device, the second terminal device provides a relay service for the first terminal device, and the first identifier is used to determine a paging occasion of the second terminal device;

the sending module is configured to send a first message to a first core network device, where the first message includes the first identifier, the first message is used to request to update the identifier of the first terminal device according to the first identifier, and the first core network device serves the first terminal device;

the receiving module is further configured to receive a second identifier from the first core network device, where the second identifier is an updated identifier of the first terminal device, and the second identifier is used to determine a paging occasion of the first terminal device.

With reference to the fourth aspect, in a first optional implementation manner of the fourth aspect, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

With reference to the first optional implementation manner of the fourth aspect, in a second optional implementation manner of the fourth aspect, the receiving module is further configured to receive the first range information from the second terminal device.

With reference to the first optional implementation manner of the fourth aspect or the second optional implementation manner of the fourth aspect, in a third optional implementation manner of the fourth aspect, a paging occasion determined according to the first identifier is the same as a paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

With reference to the fourth aspect or any optional implementation manner of the first optional implementation manner of the fourth aspect to the third optional implementation manner of the fourth aspect, in a fourth optional implementation manner of the fourth aspect, the first message further includes a first cause value, and the first cause value is used to indicate that the first terminal device is a far-end terminal device.

With reference to the fourth aspect or any one of the first optional implementation manner of the fourth aspect to the fourth optional implementation manner of the fourth aspect, in a fifth optional implementation manner of the fourth aspect,

the receiving module is further configured to receive a first cycle from the second terminal device, where the first cycle is a DRX cycle of the second terminal device;

the sending module is further configured to send a second message to the second terminal device when the processing module determines that the length of the second cycle is smaller than the length of the first cycle, where the second message includes the second cycle, and the second cycle is a DRX cycle of the first terminal device.

With reference to the fifth optional implementation manner of the fourth aspect, in a sixth optional implementation manner of the fourth aspect, the second message is further used to indicate that the length of the DRX cycle is modified to the length of the second cycle.

With reference to the fourth aspect or any optional implementation manner of the first optional implementation manner of the fourth aspect to the sixth optional implementation manner of the fourth aspect, in a seventh optional implementation manner of the fourth aspect, the second identifier is carried in a configuration update message or a registration completion message.

With reference to the fourth aspect or any optional implementation manner of the first optional implementation manner of the fourth aspect to the seventh optional implementation manner of the fourth aspect, in an eighth optional implementation manner of the fourth aspect, the sending module is further configured to send the second identifier to the second terminal device, where the second identifier is used by the second terminal device to listen to paging for the first terminal device.

With reference to the fourth aspect or any optional implementation manner of the first optional implementation manner of the fourth aspect to the eighth optional implementation manner of the fourth aspect, in a ninth optional implementation manner of the fourth aspect, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device, where mod represents a modulo operation.

With reference to the fourth aspect or any one of the first optional implementation manner of the fourth aspect to the ninth optional implementation manner of the fourth aspect, in a tenth optional implementation manner of the fourth aspect,

the sending module is further configured to send a request message to the access network device, where the request message is used to request to enter an RRC non-connected state;

the receiving module is further configured to receive a confirmation message from the access network device, where the confirmation message is used to instruct the first terminal device to enter an RRC non-connected state.

With regard to the technical effects brought about by the fourth aspect or the various alternative embodiments of the fourth aspect, reference may be made to the introduction to the technical effects of the first aspect or the respective embodiments.

In a fifth aspect, a communication device is provided, for example, the communication device is the second communication device as described above. The second communication device is configured to perform the method of the second aspect or any possible embodiment. In particular, the second communication device may comprise means for performing the method of the second aspect or any possible implementation, for example, a processing means, and optionally, a transceiver means. For example, the transceiver module may include a transmitting module and a receiving module, and the transmitting module and the receiving module may be different functional modules, or may also be the same functional module, but can implement different functions. Illustratively, the second communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device, such as a second terminal device. In the following, the second communication apparatus is taken as an example of the second terminal device. For example, the transceiver module may also be implemented by a transceiver, and the processing module may also be implemented by a processor (or a processing circuit). Alternatively, the sending module may be implemented by a sender, the receiving module may be implemented by a receiver, and the sender and the receiver may be different functional modules, or may also be the same functional module, but may implement different functions. If the second communication means is a communication device, the transceiver is implemented, for example, by an antenna, a feeder, a codec, etc. in the communication device. Alternatively, if the second communication device is a chip disposed in the communication apparatus, the transceiver (or the transmitter and the receiver) is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component. In the introduction process of the fifth aspect, the description is continued by taking the second communication apparatus as a second terminal device, and taking the processing module, the sending module, and the receiving module as an example. Wherein the content of the first and second substances,

the sending module is configured to send a first identifier to a first terminal device, where the first identifier is an identifier of a second terminal device, the second terminal device provides a relay service for the first terminal device, and the first identifier is used to determine a paging occasion of the second terminal device;

the receiving module is configured to receive a second identifier from the first terminal device, where the second identifier is an identifier of the first terminal device, and the second identifier is determined according to the first identifier, and the second identifier is used to determine a paging occasion of the first terminal device.

With reference to the fifth aspect, in a first optional implementation manner of the fifth aspect, the sending module is further configured to send first range information to the first terminal device, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

With reference to the fifth aspect or the first optional implementation manner of the fifth aspect, in a second optional implementation manner of the fifth aspect, a paging occasion determined according to the first identifier is the same as a paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

With reference to the fifth aspect or the first alternative embodiment of the fifth aspect or the second alternative embodiment of the fifth aspect, in a third alternative embodiment of the fifth aspect,

the processing module is configured to determine a paging occasion according to the second identifier;

the receiving module is further configured to monitor paging for the first terminal device according to the paging occasion.

With reference to the fifth aspect or any one of the first alternative embodiment to the third alternative embodiment of the fifth aspect, in a fourth alternative embodiment of the fifth aspect,

the sending module is further configured to send a first period to the first terminal device, where the first period is a period of the second terminal device;

the receiving module is further configured to receive a second message from the first terminal device, where the second message includes a second cycle, the second cycle is a DRX cycle of the first terminal device, and a length of the second cycle is smaller than a length of the first cycle.

With reference to the fourth optional implementation manner of the fifth aspect, in a fifth optional implementation manner of the fifth aspect, the second message is further used to instruct to modify the length of the DRX cycle to the length of the second cycle.

With reference to the fourth optional implementation manner of the fifth aspect or the fifth optional implementation manner of the fifth aspect, in a sixth optional implementation manner of the fifth aspect, the processing module is further configured to negotiate, with a second core network device, a DRX cycle of the second terminal device, where a length of the negotiated DRX cycle of the second terminal device is the same as a length of the second cycle, and the second core network device serves the second terminal device.

With reference to the fifth aspect or any optional implementation manner of the first optional implementation manner of the fifth aspect to the sixth optional implementation manner of the fifth aspect, in a seventh optional implementation manner of the fifth aspect, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device, where mod represents a modulo operation.

With regard to the technical effects brought about by the fifth aspect or the various alternative embodiments of the fifth aspect, reference may be made to the introduction to the technical effects of the second aspect or the respective embodiments.

In a sixth aspect, a communication device is provided, for example, the communication device is the third communication device as described above. The third communication device is configured to perform the method of the third aspect or any possible embodiment. In particular, the third communication device may include means for performing the method of the third aspect or any possible implementation manner, for example, a processing means, and optionally, a transceiver means. For example, the transceiver module may include a transmitting module and a receiving module, and the transmitting module and the receiving module may be different functional modules, or may also be the same functional module, but can implement different functions. Illustratively, the third communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device, for example, a second terminal device. For example, the transceiver module may also be implemented by a transceiver, and the processing module may also be implemented by a processor (or a processing circuit). Alternatively, the sending module may be implemented by a sender, the receiving module may be implemented by a receiver, and the sender and the receiver may be different functional modules, or may also be the same functional module, but may implement different functions. If the third communication means is a communication device, the transceiver is implemented, for example, by an antenna, a feeder, a codec, etc. in the communication device. Alternatively, if the third communication device is a chip disposed in the communication apparatus, the transceiver (or the transmitter and the receiver) is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component. In the introduction process of the sixth aspect, the processing module, the sending module, and the receiving module are taken as examples for introduction. Wherein the content of the first and second substances,

the receiving module is configured to receive a first identifier from a first terminal device, where the first identifier is an identifier of the first terminal device, and the first identifier is used to determine a paging occasion of the first terminal device;

the sending module is configured to send a first message to a second core network device, where the first message includes the first identifier, the first message is used to request to update an identifier of the second terminal device according to the first identifier, and the second core network device serves the second terminal device;

the receiving module is further configured to receive a second identifier from the second core network device, where the second identifier is an updated identifier of the second terminal device, and the second identifier is used to determine a paging occasion of the second terminal device.

With reference to the sixth aspect, in a first optional implementation manner of the sixth aspect, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the second terminal device, or a range to which a time-domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

With reference to the sixth aspect or the first optional implementation manner of the sixth aspect, in a second optional implementation manner of the sixth aspect, the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

With reference to the sixth aspect or the first optional implementation manner of the sixth aspect or the second optional implementation manner of the sixth aspect, in a third optional implementation manner of the sixth aspect, the first message further includes a first cause value, where the first cause value is used to indicate that the second terminal device is a relay terminal device.

With reference to the sixth aspect or any optional implementation manner of the first optional implementation manner of the sixth aspect to the third optional implementation manner of the sixth aspect, in a fourth optional implementation manner of the sixth aspect, the second identifier is carried in a configuration update message or a registration completion message.

With reference to the sixth aspect or any optional implementation manner of the first optional implementation manner of the sixth aspect to the fourth optional implementation manner of the sixth aspect, in a fifth optional implementation manner of the sixth aspect, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the first terminal device, where mod represents a modulo operation.

With reference to the sixth aspect or any one of the first alternative embodiment to the fifth alternative embodiment of the sixth aspect, in a sixth alternative embodiment of the sixth aspect,

the processing module is configured to determine a paging occasion according to the first identifier;

With regard to the technical effects brought about by the sixth aspect or the various alternative embodiments of the sixth aspect, reference may be made to the introduction of the technical effects of the third aspect or the respective embodiments.

In a seventh aspect, a communication device is provided, for example, the first communication device as described above. The communication device includes a processor (or processing circuitry) and a communication interface (or interface circuitry) that may be used to communicate with other devices or apparatuses. Optionally, a memory may also be included for storing the computer instructions. The processor and the memory are coupled to each other for implementing the method as described in the first aspect or in the various possible embodiments of the first aspect. Alternatively, the first communication device may not include the memory, and the memory may be located outside the first communication device. The processor, the memory and the communication interface are coupled to each other for implementing the method as described in the first aspect or in various possible embodiments of the first aspect. The processor, for example, when executing the computer instructions stored by the memory, causes the first communication device to perform the method of the first aspect or any one of the possible implementations of the first aspect. Illustratively, the first communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device, such as a first terminal device.

Wherein, if the first communication means is a communication device, the communication interface is implemented, for example, by a transceiver (or a transmitter and a receiver) in the communication device, for example, the transceiver is implemented by an antenna, a feeder, a codec, and the like in the communication device. Or, if the first communication device is a chip disposed in the communication apparatus, the communication interface is, for example, an input/output interface, such as an input/output pin, of the chip, and the communication interface is connected to a radio frequency transceiving component in the communication apparatus to implement transceiving of information through the radio frequency transceiving component.

In an eighth aspect, a communication device is provided, for example, the second communication device as described above. The communication device includes a processor (or processing circuitry) and a communication interface (or interface circuitry) that may be used to communicate with other devices or apparatuses. Optionally, a memory may also be included for storing the computer instructions. The processor and the memory are coupled to each other for implementing the method as described in the second aspect or in various possible embodiments of the second aspect. Alternatively, the second communication device may not include a memory, and the memory may be located outside the second communication device. The processor, the memory and the communication interface are coupled to each other for implementing the method as described in the second aspect or in various possible embodiments of the second aspect. The processor, for example, when executing the computer instructions stored by the memory, causes the second communication device to perform the method of the second aspect or any one of the possible embodiments of the second aspect. Illustratively, the second communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a terminal device, such as a second terminal device.

Wherein, if the second communication means is a communication device, the communication interface is implemented, for example, by a transceiver (or a transmitter and a receiver) in the communication device, for example, by an antenna, a feeder, a codec, etc. in the communication device. Or, if the second communication device is a chip disposed in the communication apparatus, the communication interface is, for example, an input/output interface, such as an input/output pin, of the chip, and the communication interface is connected to a radio frequency transceiving component in the communication apparatus to realize transceiving of information through the radio frequency transceiving component.

A ninth aspect provides a communication device, for example a third communication device as described above. The communication device includes a processor (or processing circuitry) and a communication interface (or interface circuitry) that may be used to communicate with other devices or apparatuses. Optionally, a memory may also be included for storing the computer instructions. The processor and the memory are coupled to each other for implementing the methods described in the third aspect or the various possible embodiments of the third aspect. Alternatively, the first communication device may not include a memory, and the memory may be located outside the third communication device. The processor, the memory and the communication interface are coupled to each other for implementing the methods described in the third aspect or the various possible embodiments of the third aspect. The processor, for example, when executing the computer instructions stored by the memory, causes the first communication device to perform the method of the third aspect or any one of the possible embodiments of the third aspect. Illustratively, the third communication device is a communication device, or a chip or other component provided in the communication device. Illustratively, the communication device is a first device. Illustratively, the first device is a terminal device, for example, a second terminal device.

Wherein, if the third communication device is a communication device, the communication interface is implemented by, for example, a transceiver (or a transmitter and a receiver) in the communication device, for example, the transceiver is implemented by an antenna, a feeder, a codec, and the like in the communication device. Or, if the third communication device is a chip disposed in the communication apparatus, the communication interface is, for example, an input/output interface, such as an input/output pin, of the chip, and the communication interface is connected to a radio frequency transceiving component in the communication apparatus to implement transceiving of information through the radio frequency transceiving component.

A tenth aspect provides a first communication system comprising the communication apparatus of the fourth aspect or the communication apparatus of the seventh aspect and comprising the communication apparatus of the fifth aspect or the communication apparatus of the eighth aspect.

In an eleventh aspect, there is provided a second communication system comprising the communication apparatus of the sixth aspect or the communication apparatus of the ninth aspect.

In a twelfth aspect, a computer-readable storage medium is provided, which is used to store a computer program, which, when run on a computer, causes the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.

In a thirteenth aspect, a computer-readable storage medium is provided, which is used to store a computer program, which, when run on a computer, causes the computer to perform the method of the second aspect or any one of its possible implementations.

In a fourteenth aspect, a computer-readable storage medium is provided, which is used for storing a computer program, which, when run on a computer, causes the computer to perform the method of the third aspect or any one of the possible embodiments of the third aspect.

In a fifteenth aspect, a computer program product is provided, comprising instructions for storing a computer program which, when run on a computer, causes the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.

In a sixteenth aspect, a computer program product comprising instructions for storing a computer program which, when run on a computer, causes the computer to perform the method of the second aspect or any one of the possible embodiments of the second aspect.

A seventeenth aspect provides a computer program product comprising instructions for storing a computer program which, when run on a computer, causes the computer to perform the method of the third aspect or any one of the possible embodiments of the third aspect.

In this embodiment of the present application, the first terminal device may request to update the identifier of the first terminal device, so that the paging occasion of the first terminal device is aligned with the paging occasion of the second terminal device as much as possible, and thus the second terminal device does not wake up again in extra time due to monitoring the paging of the first terminal device, thereby saving power consumption of the second terminal device.

Drawings

FIG. 1 is a schematic diagram of a relay scenario;

fig. 2 is a flowchart of a relay terminal device monitoring paging for a remote terminal device;

fig. 3 is a schematic diagram of a specific application scenario according to an embodiment of the present application;

FIG. 4 is a schematic diagram of another application scenario of an embodiment of the present application;

fig. 5 is a flowchart of a first communication method according to an embodiment of the present application;

fig. 6 is a schematic time domain position diagram of POs of two terminal devices processed according to the method provided in the embodiment of the present application;

fig. 7 is a schematic time domain position diagram of POs of two terminal devices processed according to the method provided in the embodiment of the present application;

fig. 8 is a schematic time domain position diagram of POs of two terminal devices that are not processed according to the method provided in the embodiment of the present application;

fig. 9 is a flowchart of a second communication method provided in the embodiment of the present application;

fig. 10 is a schematic block diagram of a first terminal device according to an embodiment of the present application;

fig. 11 is a schematic block diagram of a second terminal device according to an embodiment of the present application;

fig. 12 is another schematic block diagram of a second terminal device according to an embodiment of the present application;

fig. 13 is a schematic block diagram of a communication device according to an embodiment of the present application;

fig. 14 is another schematic block diagram of a communication device according to an embodiment of the present application;

fig. 15 is a further schematic block diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including equipment providing voice and/or data connectivity to a user, in particular, including equipment providing voice to a user, or including equipment providing data connectivity to a user, or including equipment providing voice and data connectivity to a user. For example, may include a handheld device having wireless connection capability, or a processing device connected to a wireless modem. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchange voice or data with the RAN, or interact with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a vehicle-to-all (V2X) terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (IoT) terminal device, a subscription unit (subscriber unit), a subscription station (IoT), a mobile station (mobile station), a remote station (remote station), an access point (access point, AP), a remote terminal (remote), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), or user equipment (user), etc. For example, mobile telephones (or so-called "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in the vehicle), may be considered to be vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs), for example.

In this embodiment, the terminal device may further include a relay (relay). Or, it is understood that any device capable of data communication with a base station may be considered a terminal device.

In the embodiment of the present application, the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, for example, a chip system, and the apparatus may be installed in the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal is taken as an example of a terminal device, and the technical solution provided in the embodiment of the present application is described.

2) Network devices, including, for example, Access Network (AN) devices, such as base stations (e.g., access points), may refer to devices in AN access network that communicate with wireless terminal devices over one or more cells over the air, or, for example, a network device in vehicle-to-all (V2X) technology is a Road Side Unit (RSU). The base station may be configured to interconvert received air frames and IP packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting the V2X application and may exchange messages with other entities supporting the V2X application. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB) or eNB or e-NodeB in an LTE system or an LTE-a (long term evolution-advanced), or may also include a next generation Node B (gNB) in a 5th generation (5G) new radio, NR (NR) system (also referred to as an NR system) or may also include a Centralized Unit (CU) and a distributed unit (distributed unit, DU) in a Cloud radio access network (Cloud RAN) system, which is not limited in the embodiments of the present application.

The network device may further include a core network device, for example, including an access and mobility management function (AMF), a Session Management Function (SMF), a User Plane Function (UPF), or the like in a 5G system, or including a Mobility Management Entity (MME) in a 4G system, or the like.

In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device, or may be an apparatus capable of supporting the network device to implement the function, for example, a system on chip, and the apparatus may be installed in the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.

3) Discontinuous Reception (DRX) mechanism. The DRX mechanism includes a DRX cycle (cycle) during which the terminal device periodically "wakes up" for a period of time, and may remain in a "sleep" state at other times in the DRX cycle to reduce power consumption. In short, under the DRX mechanism, the terminal device may periodically enter a sleep state without monitoring a Physical Downlink Control Channel (PDCCH).

4) Radio Resource Control (RRC) states, a terminal device has 3 RRC states: RRC connected (connected) state, RRC idle (idle) state, and RRC inactive (inactive) state.

Herein, "connected state" and "RRC connected state" are the same concept, and the two designations may be interchanged): the terminal device establishes RRC connection with the network and can perform data transmission.

Herein, "idle state" and "RRC idle state" are the same concept, and the two designations may be interchanged): the terminal device does not establish an RRC connection with the network and the base station does not store the context of the terminal device. If the terminal device needs to enter the RRC connected state from the RRC idle state, an RRC connection establishment procedure needs to be initiated.

Herein, "deactivated dynamic," "inactive state," "deactivated state," "inactive state," "RRC inactive state," or "RRC deactivated state," etc. are the same concept, and these designations may be interchanged): the terminal device has previously entered the RRC connected state at the anchor base station, which then releases the RRC connection, but the anchor base station maintains the context of the terminal device. If the terminal device needs to enter the RRC connected state again from the RRC inactive state, an RRC connection recovery procedure (alternatively referred to as an RRC connection re-establishment procedure) needs to be initiated at the currently camped base station. Because the terminal device may be in a mobile state, the base station where the terminal device currently resides and the anchor base station of the terminal device may be the same base station or different base stations. Compared with the RRC establishment process, the RRC recovery process has shorter time delay and smaller signaling overhead. However, the base station needs to store the context of the terminal device, which occupies the storage overhead of the base station.

5) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. For example, A/B, represents: a or B. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the size, content, sequence, timing, priority, degree of importance, etc., of the plurality of objects. For example, the first identifier and the second identifier may be the same identifier or different identifiers, and such names do not indicate the difference between the information amount, content, priority, importance, or the like of the two identifiers.

The foregoing has described some of the noun concepts to which embodiments of the present application relate, and the following has described some features of the embodiments of the present application.

When the terminal device is in an RRC idle state or an RRC inactive state, if the service of the terminal device is registered in the core network, the network may page the terminal device, and thus the terminal device needs to monitor paging. The terminal device may wake up on the PO of the terminal device to monitor a paging Downlink Control Information (DCI), or monitor the PDCCH, and may sleep at other times except for the PO, thereby reducing power consumption of the terminal device. Currently, a 2-bit field is included in the paging DCI, which may indicate that the paging DCI includes scheduling information, or includes a short message (short message), or includes both scheduling information and a short message. The scheduling information is used for scheduling the paging message, for example, the scheduling information includes time-frequency resource information or modulation coding information of the paging message. The short message may indicate whether system information is changed, an Earthquake and Tsunami Warning System (ETWS) notification, or a Commercial Mobile Alert Service (CMAS) notification, etc. For example, refer to table 1, which is an indication manner of the 2-bit field included in the paging DCI.

TABLE 1

After the terminal device detects the paging DCI, the paging DCI may be decoded. If the paging DCI includes scheduling information of the paging message, the terminal device continues to receive the paging message according to the scheduling information, or if the paging DCI does not include the scheduling information, e.g., includes only a short message, the terminal device does not need to receive the paging message. Further, if the terminal device receives the paging message and the paging message contains the identifier of the terminal device, it indicates that the terminal device is paged, and if the terminal device receives the paging message but the paging message does not contain the identifier of the terminal device, it indicates that the terminal device is not paged.

The terminal device may monitor one PO per DRX cycle. One PO is a set of PDCCH monitoring occasions, which may include multiple subframes or multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the PDCCH monitoring occasions of one PO may span multiple radio frames. A Paging Frame (PF) is a radio frame, and a PF may contain one or more POs or a time domain starting point including one or more POs. A PO may start on the PF associated with the PO or may start after the PF associated with the PO ends. For example, PO1 starts at PF 1 associated with PO1, and PO1 may end at PF 1, or PO1 may span multiple radio frames, and PO1 does not end at PF 1, but ends at a radio frame after PF 1.

The PO may be determined according to the parameters broadcasted by the cell, the DRX cycle of the terminal device and the identity of the terminal device. For example, the parameters of the cell broadcast include one or more of: DRX cycle/paging cycle/default paging cycle, N_sOr, PF _ offset. Wherein N represents the total number of PFs in DRX period, N_sRepresents the number of POs included in one PF, and PF _ offset is used to determine an offset value of the PF. The identifier of the terminal device may be an International Mobile Subscriber Identity (IMSI) or a 5G-service (S) -temporary mobile subscriber identity (5G S-temporary mobile subscriber identity, 5G-S-TMSI) of the terminal device.

The calculation formula of the PF of the terminal device defined in the current standard protocol is as follows:

(SFN + PF _ offset) mod T ═ T div N (UE _ ID mod N) formula 1

The frame with the frame number being the System Frame Number (SFN) determined according to equation 1 is the PF.

The calculation formula of the PO of the terminal device defined in the current standard protocol is as follows:

i _ s ═ floor (UE _ ID/N) mod Ns equation 2

I _ s determined according to equation 2 represents the index of PO.

The terminal device can determine the PO from the SFN and i _ s.

In the above two formulas, T represents the DRX cycle of the terminal device. Specifically, T is the minimum value of both the specific DRX cycle of the terminal device and the default DRX cycle of the system information broadcast. N denotes the total number of PFs in the DRX cycle. N is a radical of_sIndicates the number of POs included in one PF. PF _ offset is used to determine the offset value of the PF. The UE _ ID is the terminal device's (5G-s-TMSI mod 1024), mod denotes the modulo operation.

At present, a terminal device may communicate with a base station through other terminal devices in addition to directly communicating with the base station. For example, in a public safety scenario, the relay terminal device may act as a relay for the remote terminal device, so that the remote terminal device can communicate with the base station through the relay terminal device, which is referred to as UE2NW relay technology. For example, referring to fig. 1, a schematic diagram of a relay scenario is shown. Fig. 1 includes a terminal device 1, a terminal device 2, an access network device, and a core network device. The access network device is an access network device serving the terminal device 1, the core network device is a core network device serving the terminal device 1 and the terminal device 2, the terminal device 1 is a relay terminal device, and the terminal device 2 is a far-end terminal device, or the terminal device 1 provides a relay service for the terminal device 2. As for the terminal device 1 providing the relay service for the terminal device 2, it can be understood that the information sent by the terminal device 2 to the access network device is forwarded to the access network device through the terminal device 1, and the information sent by the access network device to the terminal device 2 is also forwarded to the terminal device 2 through the terminal device 1.

In order to better control the remote terminal device and achieve better power saving effect of the remote terminal device, the remote terminal device can establish an end-to-end Radio Resource Control (RRC) connection with the base station through the relay terminal device, that is, the remote terminal device is visible to the network, so as to realize the control of the network to the remote terminal device.

Since the remote terminal device directly registers the service of the remote terminal device in the core network, when the core network device has the service of the remote terminal device, the core network device pages (paging) the remote terminal device through a Radio Access Network (RAN), and the remote terminal device needs to reside in an air interface to monitor paging. The power consumption of the Uu port is large, so that large energy consumption is brought to the remote terminal equipment. Moreover, a typical implementation manner of the remote terminal device is that the remote terminal device can be implemented by wearable devices such as a smart watch or a smart bracelet. In such a scenario, it is obvious that the battery capacity of the remote terminal device is not too large, and if the remote terminal device is self-resident at an air interface to monitor paging and cause large power consumption, the use time of the remote terminal device may be reduced, which may result in that the remote terminal device does not have sufficient electric quantity to supply normal use, or the remote terminal device needs to be frequently charged, which is inconvenient.

In order to solve this problem, the relay terminal device may monitor paging for the remote terminal device, that is, the remote terminal device does not need to monitor paging at the Uu port, and this operation is performed by the relay terminal device. The relay terminal device may send the page of the listening to the remote terminal device through the PC5 interface. For example, referring to fig. 2, an implementation procedure for the relay terminal device to listen for paging instead of the remote terminal device.

And S21, the relay terminal equipment sends the system information to the remote terminal equipment, and the remote terminal equipment receives the system information from the relay terminal equipment.

The system information is from the base station, i.e. the base station broadcasts the system information, and the relay terminal device receives the system information from the base station. And then, the relay terminal equipment forwards the system information to the remote terminal equipment. As can be seen from the above description, to calculate the PO and the PF, the corresponding parameters of the cell broadcast need to be obtained, and the system information may include these parameters. After the remote terminal device obtains the parameters, the PF, PO, etc. of the remote terminal device can be calculated.

S22, the remote terminal equipment sends 5G-S-TMSI and DRX period to the relay terminal equipment, and the relay terminal equipment receives the 5G-S-TMSI and DRX period from the remote terminal equipment; or, the remote terminal device sends the PO information of the remote terminal device to the relay terminal device, and the relay terminal device receives the PO information from the remote terminal device.

The 5G-S-TMSI is the 5G-S-TMSI of the remote terminal device, the DRX cycle is the DRX cycle of the remote terminal device, and the DRX cycle is the minimum value of the specific DRX cycle of the remote terminal device and the default DRX cycle included in the system information. That is, the remote terminal device may send the 5G-S-TMSI and DRX cycle of the remote terminal device to the relay terminal device, so that the relay terminal device may calculate PO and PF of the remote terminal device according to the 5G-S-TMSI, and other parameters for calculating PO and PF, which are included in the system information, are known by the relay terminal device. Or, the remote terminal device may also directly send the PO information of the remote terminal device to the relay terminal device, so that the relay terminal device may directly determine the PO of the remote terminal device.

S23, the base station sends a paging message to the relay terminal device, and the relay terminal device receives the paging message from the base station.

The relay terminal device can determine the PO of the remote terminal device, and the relay terminal device wakes up when the PO of the remote terminal device arrives to monitor paging for the remote terminal device. The base station also pages at the PO if it needs to page the remote terminal device.

For example, the paging message is used to page the remote terminal. Of course, the base station may transmit the paging DCI before transmitting the paging message, for example, the paging DCI includes the scheduling information of the paging message, and then the base station may transmit the paging message again, and the relay terminal device may also monitor the paging message after receiving the paging DCI.

S24, the relay terminal device sends the paging message to the remote terminal device, and the remote terminal device receives the paging message from the relay terminal device.

The relay terminal device knows the 5G-S-TMSI of the remote terminal device and is therefore able to determine whether the paging message is for paging the remote terminal device. If the paging message is determined to be the paging remote terminal device, the relay terminal device transmits the paging message to the remote terminal device.

It can be seen that, for the relay terminal device, in addition to monitoring the paging of the relay terminal device, the paging is also monitored for the remote terminal device, and the paging of the remote terminal device is sent to the remote terminal device.

The relay terminal device needs to monitor the PO of the remote terminal device in order to monitor the paging of the remote terminal device, and the POs of the relay terminal device and the remote terminal device may be different. Then, the relay terminal device needs to wake up to listen to the paging of the remote terminal device in an additional time except for the PO of the relay terminal device, which increases the power consumption of the relay terminal device.

Therefore, there is another method, that is, after knowing the binding relationship (or relay relationship) between the remote terminal device and the relay terminal device, the core network device sends the paging information of the remote terminal device included in the paging message of the relay terminal device if the core network device needs to page the remote terminal device. Therefore, the relay terminal equipment only needs to monitor the paging of the relay terminal equipment, and can receive the paging of the remote terminal equipment when monitoring the paging of the relay terminal equipment. However, in this way, the paging information of one terminal device needs to be sent through the paging message of another terminal device, which has a great influence on the core network device, the system needs to be upgraded, and the implementation complexity is also great.

In view of this, the embodiment of the present application further provides a technical solution. The PO of one terminal device is related to the identity of the terminal device, and if the identities of two terminal devices are different, the POs of the two terminal devices may be different. Therefore, in this embodiment of the present application, the first terminal device may request the first core network device to update the identifier of the first terminal device, because the first core network device updates the identifier of the first terminal device according to the identifier (e.g., the first identifier) of the second terminal device, a paging occasion determined according to the updated identifier (e.g., the second identifier) of the first terminal device may be the same as or may be closer to a paging occasion determined according to the first identifier in a time domain, and the like. If the two paging occasions are the same, the second terminal device can monitor the paging of the first terminal device and the paging of the second terminal device at the same paging occasion without monitoring at an additional paging occasion, which is beneficial to reducing the power consumption of the second terminal device; or, if the two paging occasions are relatively close in time domain, the second terminal device may not need to enter the sleep state after monitoring the paging of one terminal device, but may enter the sleep state after the paging of the other terminal device is monitored, because the paging occasions of the two terminal devices are relatively close in time domain, the power consumption caused by the waiting of the second terminal device may be smaller than the power consumption caused by the wake-up of the second terminal device after the sleep, and thus, the power consumption of the second terminal device may also be reduced.

For example, a user can now have a variety of terminal devices, such as a mobile phone, a smart watch, a smart bracelet, or smart glasses, and at present, in addition to the mobile phone, the devices such as the smart watch are also provided with functions such as dialing a call, which is more convenient for the user to use. For example, referring to fig. 3, the smart watch can establish a connection with the mobile phone, so as to access the network through the mobile phone, and this scenario may be considered that the mobile phone provides a relay service for the smart watch. In this scenario, the smart watch may make and receive calls through the mobile phone, for example, a user may make and receive calls through the mobile phone when there is a call to the smart watch, or the user makes and receives calls through the smart watch, and the user may also make and receive calls through the mobile phone after the call, so that power consumption of the smart watch may be saved. However, generally, each terminal device needs to listen for pages. Therefore, even if the call receiving and making functions of the smart watch are all executed through the mobile phone, the user does not use the smart watch, but the smart watch still can reduce the electric quantity after a period of time, even if the smart watch is in an RRC idle state or an RRC inactive state and has no data transmission, the smart watch needs to wake up to monitor PO, and a lot of monitoring is idle, so that the smart watch consumes redundant power consumption, the electric quantity is reduced more quickly, and the cruising ability is poor. And if adopt the technical scheme of this application embodiment, the paging can be monitored to smart watch accessible cell-phone, perhaps the cell-phone can monitor the paging for smart watch to smart watch need not to wake up in PO and monitor, thereby can effectively save the consumption of smart watch.

In the embodiments of the present application, it is understood that one terminal device monitors paging for another terminal device, that is, one terminal device monitors paging DCI for another terminal device, or monitors paging DCI and paging message for another terminal device. For example, the second terminal device monitors paging for the first terminal device, which may include the second terminal device monitoring paging DCI for the first terminal device, or the second terminal device monitoring paging DCI and paging message for the first terminal device. In addition, in various embodiments of the present application, "the second terminal device listens for a page for the first terminal device," and this description is equivalent to "the first terminal device listens for a page through the second terminal device. Similarly, the description "the first terminal device listens for paging for the second terminal device" is equivalent to "the second terminal device listens for paging through the first terminal device".

The technical solution provided in the embodiment of the present application may be applied to a fourth generation mobile communication technology (4G) system, such as an LTE system, or may be applied to a 5G system, such as an NR system, or may also be applied to a next generation mobile communication system or other similar communication systems, which is not limited specifically. In addition, the technical solution provided by the embodiment of the present application may be applied to a device-to-device (D2D) scenario, such as an NR-D2D scenario, or may be applied to a vehicle-to-everything (V2X) scenario, such as an NR-V2X scenario, for example, may be applied to a vehicle networking, such as a V2X scenario, a vehicle-to-vehicle (V2V) scenario, or may be applied to the fields of smart driving, assisted driving, or smart internet vehicles, and the like.

An application scenario of the embodiment of the present application may refer to fig. 1. In addition, fig. 4 can be referred to again to illustrate another application scenario of the embodiment of the present application. Fig. 4 includes a terminal device 1, a terminal device 2, an access network device, a core network device 1, and a core network device 2. The access network device is an access network device to which the terminal device 1 is accessed, the core network device 1 is a core network device serving the terminal device 1, the core network device 2 is a core network device serving the terminal device 2, the terminal device 1 is a relay terminal device, and the terminal device 2 is a far-end terminal device, or the terminal device 1 provides a relay service for the terminal device 2. As for the terminal device 1 providing the relay service for the terminal device 2, it can be understood that the information sent by the terminal device 2 to the access network device is forwarded to the access network device through the terminal device 1, and the information sent by the access network device to the terminal device 2 is also forwarded to the terminal device 2 through the terminal device 1.

For example, terminal device 2 in fig. 1 or fig. 4 is not in the network coverage, or terminal device 2 cannot be directly served by the network, or terminal device 2 is not provided with a Uu port, so terminal device 2 can access the network through terminal device 1. Of course, the terminal device 2 may be in a network coverage area, or the terminal device 2 may have a Uu port, and the terminal device 2 may access the network through the terminal device 1.

The access network device in fig. 1 or fig. 4 is, for example, a base station. The access network device corresponds to different devices in different systems, for example, in a 4G system, the access network device may correspond to an eNB, and in a 5G system, the access network device in a 5G system, for example, a gNB. Of course, the technical solution provided in the embodiment of the present application may also be applied to a future mobile communication system, and therefore, the access network device in fig. 1 or fig. 4 may also correspond to a network device in the future mobile communication system. In fig. 1 or fig. 4, the access network device is taken as a base station as an example, and actually, referring to the foregoing description, the access network device may also be a RSU or the like. The core network device in fig. 1 or 4 is, for example, an AMF, or may be another core network device.

The method provided by the embodiment of the application is described below with reference to the accompanying drawings. It should be noted that, in the embodiments of the present application, all information interaction related to between the terminal device and the core network device may be forwarded from the core network device through the access network device, which is not mentioned below only because the solution of the embodiments of the present application does not relate to the access network device.

The embodiment of the present application provides a first communication method, please refer to fig. 5, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 1 or fig. 4 as an example.

For ease of description, in the following, the method is performed by a network device and a terminal device as an example. The first core network device described below is a core network device serving a first terminal device, the second core network device described below is a core network device serving a second terminal device, and the first core network device and the second core network device may be the same core network device or different core network devices. The first core network device is, for example, a first AMF, and the second core network device is, for example, a second AMF.

If the embodiment of the present application is applied to the network architecture shown in fig. 1, the first terminal device described below may be a terminal device 2 (i.e., a remote terminal device) in the network architecture shown in fig. 1, the second terminal device described below may be a terminal device 1 (i.e., a relay terminal device) in the network architecture shown in fig. 1, the first core network device described below may be a core network device in the network architecture shown in fig. 1, and the second core network device described below may also be a core network device in the network architecture shown in fig. 1. It can be seen that, in this scenario, the first core network device and the second core network device are the same core network device.

Alternatively, if the embodiment of the present application is applied to the network architecture shown in fig. 4, the first terminal device described below may be a terminal device 2 (i.e., a remote terminal device) in the network architecture shown in fig. 4, the second terminal device described below may be a terminal device 1 (i.e., a relay terminal device) in the network architecture shown in fig. 4, the first core network device described below may be a core network device 1 in the network architecture shown in fig. 4, and the second core network device described below may also be a core network device 2 in the network architecture shown in fig. 4. It can be seen that in this scenario, the first core network device and the second core network device are different core network devices.

S501, the second terminal device sends a first identifier to the first terminal device, and correspondingly, the first terminal device receives the first identifier from the second terminal device.

The second terminal device serves as a relay terminal device, if the relay terminal device needs to save energy, the technical scheme provided by the embodiment of the application can be executed, and the paging occasions of the first terminal device and the second terminal device can be aligned as much as possible by updating the identifier of the first terminal device, so that the power consumption of the second terminal device is reduced. Or, the second terminal device may also determine whether to execute the technical solution provided in the embodiment of the present application according to the number of remote terminal devices served by the second terminal device. For example, the number of the remote terminal devices served by the second terminal device is small, even if the POs of the remote terminal devices are different from the PO of the second terminal device, the PO of each remote terminal device additionally wakes up to monitor paging for the corresponding remote terminal device by the second terminal device, and the required power consumption may not be large, and the second terminal device may determine that the paging occasions of the first terminal device and the second terminal device do not need to be aligned, so that the technical scheme provided by the embodiment of the present application does not need to be executed; if the number of the remote end devices served by the second terminal device is large, if the POs of the remote end devices are all different from the PO of the second terminal device, or the POs of a plurality of remote end devices in the remote end devices are all different from the PO of the second terminal device, the second terminal device additionally wakes up at the PO of the remote end devices to monitor paging for the corresponding remote end devices, and the required power consumption is relatively large, the second terminal device may determine that the paging occasions of the first terminal device and the second terminal device need to be aligned as much as possible, and then the technical scheme provided by the embodiment of the present application may be executed.

Likewise, the first terminal device may also decide whether to change the PO of the first terminal device when receiving the first identity. Regarding the decision manner of the first terminal device, the embodiments of the present application are not limited.

For example, the second terminal device may send a third message to the first terminal device via the PC5 interface, the third message may include the first identification. The third message is, for example, a PC5-RRC message or a PC 5-signaling (S) message, etc. The first identity is an identity of the second terminal device, and the first identity may be used to determine a PO of the second terminal device. For example, the first identity may be the 5G-S-TMSI of the second terminal device; or, the first identifier may be a UE _ ID of the second terminal device, or the first identifier may also be referred to as a first value, and whether the first identifier is the UE _ ID of the second terminal device or the first value, the first identifier is (5G-S-TMSI mod 1024) of the second terminal device; alternatively, the first identifier may be another identifier of the second terminal device, as long as the PO of the second terminal device can be determined according to the first identifier.

For a terminal device, if it needs to listen to paging at a certain PO, the terminal device wakes up at the PO and listens to paging. However, the terminal device may not immediately enter the sleep state when the PO ends, for example, the terminal device may perform other operations after waking up, such as measuring reference signals, etc., and thus the terminal device may continue to operate for a period of time after the PO ends and then enter the sleep state. For example, a PO may be 1 second in duration, and the terminal device may wake up for 20 seconds and then go to sleep. Then, for the second terminal device, if the PO of the first terminal device and the PO of the second terminal device are the same, the second terminal device can monitor the paging of the first terminal device in the PO of the second terminal device, if the PO of the first terminal device and the PO of the second terminal device are not the same, but if the PO of the first terminal device is located in the wake-up time of the second terminal device, the second terminal device can also monitor the paging for the first terminal device, and additional power consumption caused by special wake-up is not brought.

As an alternative implementation, the second terminal device may determine a range, for example, referred to as a first range, where the first range is, for example, a value range of an identifier of the first terminal device (here, an identifier to be allocated to the first core network device), and if the identifier of the first terminal device belongs to the first range, the paging occasion determined according to the identifier of the first terminal device may be located in the wake-up time of the second terminal device, for example, the first identifier may belong to the first range; or, the first range is, for example, a range to which a time domain distance between a PO determined according to the first identifier and a PO determined according to an identifier of the first terminal device (here, an identifier to be allocated to the first core network device) belongs, and if the time domain distances of the two POs belong to the range, the PO of the first terminal device is located in a wake-up time of the second terminal device. Or, if the first range is a value range of the identifier of the first terminal device, and the identifier of the first terminal device belongs to the first range, the PO determined according to the first identifier may be the same as the PO determined according to the identifier of the first terminal device, or a time-domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device may be smaller than a first threshold; or, if the first range is a range to which a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device belongs, and a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device belongs to the range, the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device may be the same, or a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device may be smaller than the first threshold. It is understood that as long as the time-domain distance between the two POs is smaller than the first threshold, or the two POs are the same, the PO of the first terminal device is within the time that the second terminal device wakes up. Wherein, if the time domain distance between the PO determined according to the first identifier and the PO determined according to the first terminal equipment identifier is smaller than the first threshold, the two POs may partially overlap in the time domain or may not overlap in the time domain in one DRX cycle in which the two POs both appear.

In addition, the identity of the first terminal device belongs to the first range, where the identity refers to, for example, the UE _ ID of the first terminal device. Or more precisely, the UE _ ID corresponding to the identity of the first terminal device should be made to belong to the first range. For example, if the identifier of the first terminal device is 5G-S-TMSI, the value of (5G-S-TMSI mod 1024) of the first terminal device should be within the first range.

For example, if the first range is a value range of an identifier of the first terminal device, the first identifier is, for example, a UE _ ID of the second terminal device, for example, the first identifier is 758, the second terminal device may determine the first range according to a time when the second terminal device wakes up, for example, the first range is [648,798 ]. In summary, the second terminal device needs to enable the first range to be satisfied, and as long as the identifier of the first terminal device belongs to the first range, the PO determined according to the identifier of the first terminal device may be located within the wake-up time of the second terminal device. Here, the first range is a value range of an identifier of the first terminal device, where the identifier of the first terminal device may refer to a UE _ ID of the first terminal device.

For example, if the first range is a range to which a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device belongs, the first range information may include two values, a time domain range formed by the two values is the first range, for example, the two values included in the first range information are 0 and 10, and the first range is [0,10], and a unit is, for example, milliseconds. Or, if the first range is a range to which the time-domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device belongs, the first range information may also include only one value, and a range may also be determined according to the one value, where the range is the first range. For example, the first range information includes a value of 10, and then the first range may be [0,10] in units of, for example, milliseconds. If the PO of the first terminal device and the PO of the second terminal device are different, the PO of the first terminal device may be located before the PO of the second terminal device in the time domain, or may also be located after the PO of the second terminal device, as long as the time domain distance between the two POs is located within the first range.

For example, the second terminal device may send first range information to the first terminal device, and the first range information may indicate the first range. For example, the second terminal device may also include the first range information in the third message and transmit the third range information to the first terminal device.

In addition, as an optional implementation manner, the second terminal device may further send a first cycle to the first terminal device, and the first cycle is received by the first terminal device from the second terminal device, where the first cycle is a DRX cycle of the second terminal device (which may be a DRX cycle of the second device in an idle state or an inactive state), that is, the second terminal device may notify the first terminal device of the DRX cycle of the second terminal device. For example, the second terminal device may also include the first period in the third message and transmit it to the first terminal device.

S502, the first terminal device sends a second message to the second terminal device, and correspondingly, the second terminal device receives the second message from the first terminal device. The second message includes a second periodicity.

The first terminal device may determine a magnitude relationship of a second cycle and the first cycle if the first cycle is received by the first terminal device, the second cycle being a DRX cycle of the first terminal device. If the second period is greater than or equal to the first period, the second terminal device does not need to know the DRX period of the first terminal device, and the second terminal device can monitor the paging of the first terminal device as long as it monitors the paging according to the first period, so S502 may not be necessarily performed in this case; alternatively, if the second cycle is smaller than the first cycle, that is, the DRX cycle of the remote terminal device is smaller than the DRX cycle of the relay terminal device, S502 may be performed. Thus, S502 is an optional step, represented by the dashed line in fig. 5.

Since, in case the second period is smaller than the first period, the second terminal device may miss some pages if it does not know the DRX period of the first terminal device but listens for pages for the first terminal device according to the first period. For example, the first period is 1.28 seconds, the second period is 640 milliseconds, the core network device pages the first terminal device at 640 millisecond intervals, and if the second terminal device listens every 1.28 seconds, the paging of the first terminal device may be missed. Therefore, if the second period is smaller than the first period, the first terminal device may send a second message to the second terminal device, and the second message informs the second terminal device of the DRX period of the first terminal device, so as to reduce the probability that the second terminal device misses paging of the first terminal device.

As an optional implementation, the second message may further include first indication information, for example, occupying one or more bits (bits), and the first indication information may indicate (or suggest) to modify the length of the DRX cycle to the length of the second cycle. For example, the first indication information occupies 1 bit, and if the value of the bit is "0", it indicates that the length of the DRX cycle does not need to be modified; if the value of the bit is "1", it indicates that it is recommended to modify the length of the DRX cycle. For another example, if the second message does not include the first indication information, it indicates that the length of the DRX cycle does not need to be modified; if the second message includes the first indication information, it indicates that it is recommended to modify the length of the DRX cycle. That is, if the second cycle is smaller than the first cycle, the first terminal device may instruct the second terminal device to modify the DRX cycle of the second terminal device, so that the length of the modified DRX cycle of the second terminal device is the same as the length of the second cycle, and thus, the second terminal device may monitor paging for the first terminal device according to the second cycle, which reduces the probability of missing paging of the first terminal device.

Alternatively, the second message may not include the first indication information, and the second period included in the second message may implicitly indicate (or suggest) to modify the length of the DRX cycle to the length of the second period. In this way, no additional indication information is needed, which is helpful to save signaling overhead.

Alternatively, the second message may not instruct to modify the DRX cycle, i.e. the second message only sends the second cycle to the second terminal device, and does not instruct the second terminal device to modify the DRX cycle.

S503, the second terminal device negotiates with the second core network device about the DRX cycle of the second terminal device. Fig. 5 illustrates an example in which the first core network device and the second core network device are the same core network device, that is, the core network device in fig. 5.

If the second message indicates to modify the length of the DRX cycle, S503 may be performed; alternatively, S503 may be performed if the second message does not indicate to modify the length of the DRX cycle, or S503 may not be performed, in which case whether S503 is to be performed or not, may depend on the implementation of the second terminal device. It can be seen that S503 is an optional step, indicated by the dashed line in fig. 5.

For example, when negotiating with the second core network device, the second terminal device may send a second cause value to the second core network device, where the second cause value may indicate that the second terminal device is the relay terminal device, or indicate that the second terminal device provides the relay service for the first terminal device, and therefore the DRX cycle of the second terminal device needs to be adjusted to be consistent with the DRX cycle of the first terminal device.

For example, the second terminal device may send a first negotiation message to the second core network device, and the second core network device receives the first negotiation message from the second terminal device, where the first negotiation message is, for example, an initial registration message or a mobile registration message. The first negotiation message may comprise a DRX parameter requested by the second terminal device or a requested extended idle DRX parameter, etc. The second core network device sends a second negotiation message to the second terminal device, and the second terminal device receives the second negotiation message from the second core network device, where the second negotiation message is, for example, a registration completion message or other messages. In the second negotiation message, a negotiated DRX parameter or a negotiated DRX parameter for expanding an idle state may be included to indicate a DRX-related parameter. The negotiation may be completed, or the second terminal device may further send a message to the second core network device to continue the negotiation, and so on until the negotiation is completed.

The second terminal device may, through negotiation with the second core network device, make the length of the DRX cycle of the second terminal device determined through the negotiation be the same as the length of the second cycle. For example, the DRX cycle of the second terminal device determined by the negotiation is referred to as a third cycle, and the length of the third cycle may be the same as the length of the second cycle. If the PO of the first terminal device is different from the PO of the second terminal device, but the time domain distance between the two POs is smaller than the first threshold, the second terminal device may not enter the sleep state after monitoring the paging of one terminal device, but enters the sleep state after monitoring the paging of the other terminal device. Or, if the PO of the first terminal device and the PO of the second terminal device are the same, the PO of the first terminal device and the PO of the second terminal device may be completely overlapped, and the second terminal device only needs to wake up at the PO of the second terminal device to monitor, and can monitor the paging of the second terminal device and also monitor the paging of the first terminal device. For example, referring to fig. 6, it is a schematic diagram that the PO of the first terminal device and the PO of the second terminal device are completely overlapped (or completely aligned or identical). T in fig. 6 denotes a DRX cycle (e.g., second cycle) of the first terminal device, the length of the DRX cycle of the first terminal device is the same as the length of the DRX cycle (e.g., third cycle) of the second terminal device, and thus the PO of the first terminal device and the PO of the second terminal device completely overlap, and thus the rectangular box in fig. 6 denotes both the PO of the first terminal device and the PO of the second terminal device.

If the second terminal device receives the second message, it indicates that the second cycle is less than the first cycle, but the second terminal device may not negotiate with the second core network device to re-determine the DRX cycle of the second terminal device, i.e. the DRX cycle of the second terminal device is still the first cycle. In this case, the second terminal device listens for pages of the second terminal device at both the first and second periods. In this case, for a DRX cycle in which the PO of the first terminal device and the PO of the second terminal device are both present, the PO of the second terminal device and the PO of the first terminal device (that is, the PO determined according to the second identifier to be described later) may be aligned (that is, the PO of the second terminal device and the PO of the first terminal device are the same), and then in the DRX cycle, the second terminal device only needs to wake up and monitor at the PO of the second terminal device, and does not need to wake up again in an additional PO. Therefore, even if the second terminal device does not modify the DRX period of the second terminal device, the power consumption of the second terminal device caused by monitoring paging can be reduced.

Or, for a DRX cycle in which the PO of the first terminal device and the PO of the second terminal device are both present, if the PO of the second terminal device and the PO of the first terminal device (which is a PO determined according to a second identifier to be described later) are also different, but the time-domain distance between the two POs is smaller than the first threshold, the second terminal device may not enter the sleep state after monitoring the paging of one terminal device, but enter the sleep state after monitoring the paging of the other terminal device. Therefore, even if the second terminal device does not modify the DRX period of the second terminal device, the power consumption of the second terminal device caused by monitoring paging can be reduced. For example, referring to fig. 7, it is a schematic diagram that the PO of the first terminal device and the PO of the second terminal device are not completely overlapped (or the time domain distance is smaller than the first threshold). T1 in fig. 7 denotes a first period, and T2 denotes a second period. If the length of the second period is smaller than that of the second period, the PO of the first terminal device and the PO of the second terminal device may or may not partially overlap in one DRX period in which the PO of the first terminal device and the PO of the second terminal device both appear, and fig. 7 takes the case where the PO of the first terminal device and the PO of the second terminal device do not overlap. The blank rectangular box in fig. 7 indicates the PO of the first terminal device, and the hatched rectangular box indicates the PO of the second terminal device.

Fig. 8 is a schematic diagram illustrating that the PO of the first terminal device and the PO of the second terminal device are different, where fig. 8 illustrates a case where the PO of the first terminal device and the PO of the second terminal device are completely different, that is, the PO of the first terminal device and the PO of the second terminal device are different, and the time-domain distance between the PO of the first terminal device and the PO of the second terminal device is greater than or equal to the first threshold. T1 in FIG. 8 denotes the DRX cycle of the first terminal device, T2 denotes the DRX cycle of the second terminal device, e.g., the length of the DRX cycle of the first terminal device is smaller than the length of the DRX cycle of the second terminal device. The blank rectangular box in fig. 8 indicates the PO of the first terminal device, and the hatched rectangular box indicates the PO of the second terminal device. It can be seen that, in one DRX cycle where two POs appear, the time domain distances of the two POs are far, and after one of the POs is monitored by the second terminal device, even if operations such as measuring reference signals are also performed, the other PO may not be started after the other PO is monitored, so that the second terminal device needs to go to sleep, and wake up again to monitor paging when the other PO is started. It is clear that the scenario shown in fig. 8 is more power consuming for the second terminal device than the scenario shown in fig. 6 or the scenario shown in fig. 7. According to the several drawings, the second terminal device can achieve the purpose of energy saving by adopting the method provided by the embodiment of the application.

S504, the first terminal device sends a first message to the first core network device, and accordingly, the first core network device receives the first message from the first terminal device. Such as non-access stratum (NAS) messages. For example, the first message may multiplex an existing message, and for example, the first message may be a registration request (registration request) message, or may also be another NAS message, for example, another NAS message in the registration process, or another NAS message after the registration is completed. Alternatively, the first message may also be a message newly added in the embodiment of the present application, and is dedicated to sending the identifier of the terminal device.

The first message may comprise a first identity, the first message being for requesting an update of the identity of the first terminal device in dependence of the first identity. The first message may include second indication information, and the second indication information may be used to request to update the identifier of the first terminal device according to the first identifier, for example, the second indication information may occupy one or more bits. Alternatively, the first message may not include the second indication information, and the first identifier may implicitly indicate that the identifier of the first terminal device is updated according to the first identifier. Optionally, the first message may further include a first cause value, where the first cause value may indicate that the first terminal device is a far-end terminal device, or indicate that the second terminal device provides the relay service for the first terminal device, and therefore the first terminal device needs to set the identifier of the first terminal device according to the identifier (i.e., the first identifier) of the second terminal device.

As an optional implementation, the first message may further include the first range information. The first range information may be sent by the second terminal device to the first terminal device, and the first terminal device may add the first range information to the first message and forward the first message to the first core network device. Or, the first terminal device may also process the first range information from the second terminal device and then send the first range information to the first core network device. For example, the first range indicated by the first range information sent by the second terminal device to the first terminal device is a range to which the identifier of the first terminal device belongs, and then the first terminal device may determine, according to the first range, a range to which a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device belongs, so that the first range indicated by the first range information sent by the first terminal device to the first core network device may be a range to which a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the first terminal device belongs. That is, the first range information sent by the second terminal device to the first terminal device and the first range information sent by the first terminal device to the first core network device may be the same type of information, for example, the indicated first ranges are all ranges to which the identifier of the first terminal device belongs, or may be different types of information, for example, the first range indicated by the first range information sent by the second terminal device to the first terminal device is a range to which the identifier of the first terminal device belongs, and the first range indicated by the first range information sent by the first terminal device to the first core network device is a range to which a time domain distance between a PO determined according to the first identifier and a PO determined according to the identifier of the first terminal device belongs.

S505, the first core network device allocates a new identifier to the first terminal device according to the first identifier, for example, the allocated new identifier is referred to as a second identifier.

If the first message does not include the first range information, the UE _ ID corresponding to the second identity allocated by the first core network device may be the same as the UE _ ID corresponding to the second identity. Making the UE _ ID corresponding to the second identity the same as the UE _ ID corresponding to the second identity enables the PO determined from the first identity to be the same as the PO determined from the second identity. For example, the second identifier may be a 5G-globally unique temporary UE identity (GUTI) of the first terminal device, or a 5G-S-TMSI of the first terminal device, or may be another identifier of the first terminal device. The first identity is for example the UE _ ID of the second terminal device, or the 5G-S-TMSI of the second terminal device, etc. However, no matter what type of identifier the second identifier is, the UE _ ID corresponding to the second identifier is the same as the UE _ ID corresponding to the first identifier. For example, if the first identifier is a UE _ ID of the second terminal device, and the second identifier is 5G-S-TMSI of the first terminal device, the UE _ ID corresponding to the second identifier is (5G-S-TMSI mod 1024) of the first terminal device, so that the value is the same as the first identifier; for another example, if the first identifier is 5G-S-TMSI of the second terminal device and the second identifier is 5G-GUTI of the first terminal device, the UE _ ID corresponding to the second identifier is the lower 10 bits of the 5G-GUTI of the first terminal device, so that the value is the same as (5G-S-TMSI mod 1024) of the second terminal device.

Alternatively, if the first message includes the first range information, the first core network device may assign a new identifier to the first terminal device according to the first range information and the first identifier. The UE _ ID corresponding to the second identifier allocated by the first core network device may be the same as or different from the UE _ ID corresponding to the second identifier, which in short needs to be satisfied that the UE _ ID corresponding to the second identifier belongs to the first range, or that a time domain distance between a PO determined according to the UE _ ID corresponding to the second identifier and a PO determined according to the UE _ ID corresponding to the second identifier belongs to the first range. For example, the first range indicated by the first range information is a range to which the identifier of the first terminal device belongs, for example, the first range is [648,798], and then the first core network device may select a value from the first range to allocate to the first terminal device, for example, the first core network device allocates the second identifier to the first terminal device, and the value is a value of the UE _ ID corresponding to the second identifier. For another example, the first range indicated by the first range information is a range to which a time-domain distance between a PO determined according to the first identifier and a PO determined according to the identifier of the first terminal device belongs, the first core network device may select a value from the first range, and according to the value and the first identifier, an identifier, for example, a second identifier, can be determined, and then, the time-domain distance between a PO determined according to the first identifier and a PO determined according to the identifier of the first terminal device is the value, and the value belongs to the first range.

The first core network device allocates a new identifier to the first terminal device according to the first identifier, so that the PO determined according to the first identifier is the same as the PO determined according to the second identifier, or the time-domain distance between the PO determined according to the first identifier and the PO determined according to the second identifier is smaller than the first threshold.

S506, the first core network device sends the second identifier to the first terminal device, and the first terminal device receives the second identifier from the first core network device.

After the first core network device allocates the second identifier to the first terminal device, the first core network device may send the second identifier to the first terminal device, so that the first terminal device may obtain a new identifier of the first terminal device. For example, the first core network device may include the second identifier in a fourth message, and send the fourth message to the first terminal device, where the fourth message may reuse an existing message, and for example, the fourth message may be a registration completion (registration completion) message, or a configuration update command message (configuration update command message), or the fourth message may also be a message newly added in the embodiment of the present application and dedicated to sending the identifier to the terminal device.

S507, the first terminal device sends a second identifier to the second terminal device, and the second terminal device receives the second identifier from the first terminal device.

Alternatively, the first terminal device may not send the second identifier to the second terminal device, that is, S507 is not executed. Because the second terminal device performs S501, it indicates that the second terminal device has started a process to align the PO of the first terminal device and the PO of the second terminal device. Then, even if the second terminal device does not know the second identifier, the second terminal device may monitor paging for the first terminal device according to the second cycle, that is, the second terminal device may wake up to monitor paging for the first terminal device within the PO of each DRX cycle therein according to the second cycle. If the second terminal device does not know the second identifier, the second terminal device cannot determine whether the first terminal device is paged, and in this case, if the second terminal device listens to the paging message according to the second cycle, the second terminal device will send the paging message to the first terminal device, and the first terminal device will determine whether the paging message is paged. This way the burden on the second terminal device can be reduced, but more paging messages may need to be received by the first terminal device. It can be seen that S507 is an optional step, indicated by the dashed line in fig. 5.

In addition, the first terminal device may enter an RRC unconnected state. For example, the RRC non-connected state may be an RRC idle state or may also be an RRC inactive state. For example, the first terminal device may enter the RRC non-connected state before performing S507 and after performing S506, or the first terminal device may enter the RRC non-connected state after performing S507. The first terminal device may enter the RRC non-connected state by sending a request message to the access network device, and the access network device receiving the request message from the first terminal device, where the request message may be used to request to enter the RRC non-connected state. Then, the access network device sends a confirmation message to the first terminal device, where the confirmation message is used to indicate that the first terminal device enters the RRC non-connected state, and then the first terminal device enters the RRC non-connected state.

And S508, the second terminal equipment enters an RRC non-connection state. For example, the RRC non-connected state may be an RRC idle state or may also be an RRC inactive state.

S509, the core network device pages the first terminal device according to the second cycle, and the second terminal device monitors the paging from the core network device according to the second cycle.

The second terminal device knows the second identifier, and therefore the PO of the first terminal device can be determined according to the second identifier, so that the second terminal device monitors paging for the first terminal device at the PO of the first terminal device. Or, if the first terminal device does not send the second identifier to the second terminal device, the second terminal device may monitor paging for the first terminal device at the PO of the second terminal device, or the second terminal device may monitor paging for the first terminal device at the wake-up time of the PO of the second terminal device. Because the PO of the first terminal device is the same as the PO of the second terminal device, or the time domain distance is smaller than the first threshold, the second terminal device can still monitor the paging of the first terminal device.

S510, the second terminal device sends the paging message to the first terminal device, and the first terminal device receives the paging message from the second terminal device.

Wherein S509 and S510 are optional steps, indicated by dashed lines in fig. 5.

If the first terminal device sends the second identifier to the second terminal device, the second terminal device may determine whether the paging message includes the second identifier if the paging message is monitored when monitoring paging for the first terminal device, if the paging message includes the second identifier, the second terminal device sends the paging message to the first terminal device, and if the paging message does not include the second identifier, the first terminal device is not paged, the second terminal device may not need to send the paging message to the first terminal device, for example, the second terminal device may discard the paging message. By the method, information interaction between the second terminal equipment and the first terminal equipment can be reduced, transmission overhead is saved, redundant information received by the first terminal equipment can be reduced, and effectiveness of the information received by the first terminal equipment is improved.

Or, if the first terminal device does not send the second identifier to the second terminal device, the second terminal device may also monitor paging for the first terminal device according to the second period. However, since the second terminal device does not know the second identifier, the second terminal device cannot determine whether the first terminal device is paged. In this case, if the second terminal device listens to the paging message according to the second cycle, the second terminal device will send the paging message to the first terminal device, and the first terminal device will determine whether to be paged. This way the burden on the second terminal device can be reduced, but more paging messages may need to be received by the first terminal device.

Of course, the core network device may also page the second terminal device according to the first cycle (or the third cycle), and the second terminal device may also monitor the paging from the core network device according to the first cycle (or the third cycle), which is not described herein again.

In this embodiment of the present application, the first terminal device may request to update the identifier of the first terminal device, so that the PO of the first terminal device is aligned with the PO of the second terminal device as much as possible, and thus the second terminal device does not wake up again in extra time due to monitoring the paging of the first terminal device, thereby saving the power consumption of the second terminal device.

In the embodiment shown in fig. 5, the remote terminal device (e.g., the first terminal device) requests to update the identifier of the second terminal device, so that the PO of the first terminal device is aligned with the PO of the second terminal device as much as possible. Alternatively, there may be another way that the relay terminal device (e.g., the second terminal device) may also request to update the identifier of the relay terminal device, so that the PO of the first terminal device and the PO of the second terminal device are aligned as much as possible. In view of this, the present application provides a second communication method, in which a second terminal device may request to update an identifier of the second terminal device. Please refer to fig. 9, which is a flowchart of the method. For example, if the second terminal device provides the relay service for only one terminal device (e.g., the first terminal device), the method provided by the embodiment shown in fig. 5 may be adopted, and the method provided by the embodiment shown in fig. 9 may also be adopted; alternatively, if the second terminal device provides the relay service for multiple terminal devices, if the method provided by the embodiment shown in fig. 9 is adopted, the second terminal device can only align PO with one of the terminal devices as much as possible, but for other terminal devices, the second terminal device still needs to wake up for listening to the paging in an extra time, and therefore, if this is the case, the method provided by the embodiment shown in fig. 5 is preferably adopted.

In the following description, the second communication method is applied to the network architecture shown in fig. 1 or fig. 4 as an example.

S901, the first terminal device sends a first identifier to the second terminal device, and the second terminal device receives the first identifier from the first terminal device. In an embodiment of the present application, the first identifier is an identifier of the first terminal device.

The second terminal device serves as a relay terminal device, if the relay terminal device needs to save energy, the technical scheme provided by the embodiment of the application can be executed, and the paging occasions of the first terminal device and the second terminal device can be aligned as much as possible by updating the identifier of the second terminal device, so that the power consumption of the second terminal device is reduced. Or, the second terminal device may also determine whether to execute the technical solution provided in the embodiment of the present application according to the number of remote terminal devices served by the second terminal device. For example, only one remote terminal device (e.g., a first terminal device) served by a second terminal device is provided, and even if the PO of the remote terminal device is different from the PO of the second terminal device, the second terminal device additionally wakes up at the PO of the remote terminal device to monitor paging for the remote terminal device, and the required power consumption may not be large, the second terminal device may determine that it is not necessary to align the paging occasions of the first terminal device and the second terminal device, and then it is not necessary to execute the technical solution provided by the embodiment of the present application; or, even if there is only one remote terminal device (e.g., the first terminal device) served by the second terminal device, the second terminal device may also execute the technical solution provided by the embodiment of the present application because power consumption is to be saved.

For example, the first terminal device may send a second message to the second terminal device via the PC5 interface, the second message may include the first identification. The second message is for example a PC5-RRC message or a PC5-S message or the like. The first identity is an identity of the first terminal device, and the first identity may be used to determine a PO of the first terminal device. For example, the first identity may be the 5G-S-TMSI of the first terminal device; or, the first identifier may be a UE _ ID of the first terminal device, in this case, the first identifier may also be referred to as a first value, and no matter whether the first identifier is the UE _ ID of the first terminal device or the first value, the first identifier is (5G-S-TMSI mod 1024) of the first terminal device; alternatively, the first identifier may be another identifier of the first terminal device, as long as the PO of the first terminal device can be determined according to the first identifier.

Optionally, the first terminal device may further send the first period to the second terminal device, and the second terminal device may receive the first period from the first terminal device. The first cycle is a DRX cycle of the first terminal device. Since the first cycle is the minimum value between the specific DRX cycle of the first terminal device and the default DRX cycle of the system information broadcast, if the first cycle is the specific DRX cycle of the first terminal device, the first cycle is likely to be smaller than the DRX cycle of the second terminal device (the DRX cycle of the second terminal device is likely to be the default DRX cycle of the system information broadcast), and if this is the case, the second terminal device monitors the first terminal device for pages according to the DRX cycle of the second terminal device if it does not know the DRX cycle of the first terminal device, and if the length of the DRX cycle of the second terminal device is greater than the length of the first cycle, the second terminal device may miss some pages. In this case, the first terminal device can therefore transmit the first period to the second terminal device.

Or, if the first cycle is a default DRX cycle of the system information broadcast, the DRX cycle of the second terminal device will only be greater than or equal to the DRX cycle of the first terminal device (if the DRX cycle of the second terminal device is also the default DRX cycle, the length of the DRX cycle of the second terminal device is equal to the length of the first cycle, or, if the DRX cycle of the second terminal device is a specific DRX cycle of the second terminal device, the length of the DRX cycle of the second terminal device is less than the length of the first cycle). If this is the case, the second terminal device does not need to know the DRX cycle of the first terminal device, and the second terminal device can monitor the paging of the first terminal device as long as it monitors the paging according to the DRX cycle of the second terminal device. In this case, the first terminal device may not transmit the first period to the second terminal device.

If the first terminal device is to transmit the first period to the second terminal device, the first terminal device may add the first period to the second message and transmit to the second terminal device.

S902, the second terminal device sends the first message to the second core network device, and the second core network device receives the first message from the second terminal device. The first message is for example a NAS message. For example, the first message may multiplex an existing message, for example, the first message may be a registration request, or may be another NAS message, for example, another NAS message in the registration process, or another NAS message after the registration is completed. Alternatively, the first message may also be a message newly added in the embodiment of the present application, and is dedicated to sending the identifier of the terminal device.

The first message may comprise a first identity and the first message may be for requesting an update of the identity of the second terminal device in dependence of the first identity. The first message may include indication information, and the indication information may be used to request to update the identity of the second terminal device according to the first identity, for example, the indication information may occupy one or more bits. Alternatively, the first message may not include indication information, and the first identifier may implicitly indicate that the identifier of the second terminal device is updated according to the first identifier. Optionally, the first message may further include a first cause value, where the first cause value may indicate that the second terminal device is the relay terminal device, or indicate that the second terminal device provides the relay service for the first terminal device, so that the second terminal device needs to set the identifier of the second terminal device according to the identifier (i.e., the first identifier) of the first terminal device.

As an optional implementation manner, the second terminal device may determine a range, for example, referred to as a first range, where the first range is, for example, a value range of an identifier of the second terminal device (here, an identifier to be allocated to the first core network device), and if the identifier of the second terminal device belongs to the first range, the paging occasion determined according to the identifier of the first terminal device is located in a wake-up time of the second terminal device, for example, the first identifier may belong to the first range; or, the first range is, for example, a range to which a time domain distance between a PO determined according to the first identifier and a PO determined according to an identifier of the second terminal device (here, an identifier to be allocated by the first core network device) belongs, and if the time domain distances of the two POs belong to the range, the PO of the first terminal device is located in a wake-up time of the second terminal device. Or, if the first range is a value range of the identifier of the second terminal device, and the identifier of the second terminal device belongs to the first range, the PO determined according to the first identifier may be the same as the PO determined according to the identifier of the second terminal device, or a time-domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the second terminal device may be smaller than a first threshold; or, if the first range is a range to which a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the second terminal device belongs, and a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the second terminal device belongs to the range, the PO determined according to the first identifier and the PO determined according to the identifier of the second terminal device may be the same, or a time domain distance between the PO determined according to the first identifier and the PO determined according to the identifier of the second terminal device may be smaller than the first threshold. It is understood that as long as the time-domain distance between the two POs is smaller than the first threshold, or the two POs are the same, the PO of the first terminal device is within the time that the second terminal device wakes up. Wherein, if the time domain distance between the PO determined according to the first identifier and the PO determined according to the second terminal equipment identifier is smaller than the first threshold, the two POs may partially overlap in the time domain or may not overlap in the time domain in one DRX cycle in which the two POs both appear.

For more description of the first range information or the first range, reference may be made to S501 in the embodiment shown in fig. 5.

For example, the second terminal device may send the first range information to the second core network device, and the first range information may indicate the first range. For example, the second terminal device may include the first range information in the first message, and send the first range information to the second core network device.

S903, the second core network device allocates a new identifier to the second terminal device according to the first identifier, for example, the allocated new identifier is referred to as a second identifier.

For more description on the assignment of the second identifier by the second core network device, reference may be made to S505 in the embodiment shown in fig. 5.

S904, the second core network device sends the second identifier to the second terminal device, and the second terminal device receives the second identifier from the second core network device.

For example, the second core network device may include the second identifier in a third message, and send the third message to the first terminal device, where the third message may multiplex an existing message, for example, the third message may be a registration completion message or a configuration update command message, or the third message may also be a message added in this embodiment and dedicated to sending the identifier to the terminal device.

S905, the second terminal equipment enters an RRC non-connection state. For example, the RRC non-connected state may be an RRC idle state or may also be an RRC inactive state.

In addition, the first terminal device may enter the RRC unconnected state before the second terminal device enters the RRC unconnected state. The embodiment of the present application is not limited to when the first terminal device enters the RRC non-connected state. For example, the first terminal device may have entered the RRC non-connected state before performing S901, or the first terminal device may enter the RRC non-connected state after performing S901, and so on.

S906, the core network device pages the first terminal device according to the second period, and the second terminal device monitors the paging from the core network device according to the second period.

The second terminal device knows the first identifier, and the second terminal device can determine the PO of the first terminal device according to the first identifier, so that the second terminal device monitors paging for the first terminal device at the PO of the first terminal device.

S907, the second terminal device sends the paging message to the first terminal device, and the first terminal device receives the paging message from the second terminal device.

Wherein S906 and S907 are optional steps, indicated by dashed lines in fig. 9.

In this embodiment, the first terminal device sends the first identifier to the second terminal device, if the first identifier is the 5G-S-TMSI of the first terminal device, the second terminal device may determine whether the paging message includes the first identifier if the paging message is monitored when monitoring paging for the first terminal device, if the first identifier is included, it indicates that the first terminal device is paged, the second terminal device sends the paging message to the first terminal device, and if the paging message does not include the first identifier, it indicates that the first terminal device is not paged, the second terminal device may not have to send the paging message to the first terminal device, for example, the second terminal device may discard the paging message. By the method, information interaction between the second terminal equipment and the first terminal equipment can be reduced, transmission overhead is saved, redundant information received by the first terminal equipment can be reduced, and effectiveness of the information received by the first terminal equipment is improved.

Alternatively, if the first identifier is the UE _ ID of the first terminal device and the paging message carries other identifiers of the first terminal device, for example, the 5G-S-TMSI of the first terminal device, the second terminal device cannot obtain the other identifiers of the first terminal device. The second terminal device will still listen for paging for the first terminal device according to the second cycle. However, since the second terminal device does not know the complete identity of the first terminal device, the second terminal device cannot determine whether the first terminal device is paged. In this case, if the second terminal device listens to the paging message according to the second cycle, the second terminal device will send the paging message to the first terminal device, and the first terminal device will determine whether to be paged. This way the burden on the second terminal device can be reduced, but more paging messages may need to be received by the first terminal device.

Of course, the core network device may also page the second terminal device according to the DRX cycle of the second terminal device, and the second terminal device may also monitor paging from the core network device according to the DRX cycle of the second terminal device, which is not described in detail herein.

In this embodiment of the present application, the second terminal device may request to update the identifier of the second terminal device, so that the PO of the second terminal device is aligned with the PO of the first terminal device as much as possible, and thus the second terminal device does not wake up again in extra time due to monitoring the paging of the first terminal device, thereby saving the power consumption of the second terminal device.

The following describes an apparatus for implementing the above method in the embodiment of the present application with reference to the drawings. Therefore, the above contents can be used in the subsequent embodiments, and the repeated contents are not repeated.

Fig. 10 is a schematic block diagram of a communication device 1000 according to an embodiment of the present application. Exemplarily, the communication apparatus 1000 is, for example, a first terminal device 1000. Illustratively, the first terminal device 1000 is, for example, the first terminal device described in the embodiment shown in fig. 5.

The first terminal device 1000 includes a transmitting module 1020 and a receiving module 1030. Optionally, the first terminal device 1000 may further include a processing module 1010. Illustratively, the first terminal device 1000 may be a terminal device, and may also be a chip applied in the terminal device or other combined devices, components, and the like having the functions of the first terminal device. When the first terminal device 1000 is a terminal device, the transmitting module 1020 may be a transmitter, the transmitter may include an antenna, a radio frequency circuit, and the like, the receiving module 1030 may be a receiver, and the receiver may include an antenna, a radio frequency circuit, and the like, wherein the transmitter and the receiver may be different modules, respectively, or the transmitter and the receiver may be disposed in the same functional module, which may be called a transceiver, and the processing module 1010 may be a processor (or processing circuit), such as a baseband processor, which may include one or more Central Processing Units (CPUs). When the first terminal device 1000 is a component having the above-mentioned function of the first terminal device, the sending module 1020 may be a radio frequency unit, and the receiving module may also be a radio frequency unit, wherein the transmitter and the receiver may be different modules respectively, or the transmitter and the receiver may be disposed in the same functional module, which may be a radio frequency unit, and the processing module 1010 may be a processor (or a processing circuit), such as a baseband processor. When the first terminal device 1000 is a chip system, the transmitting module 1020 may be an output interface of a chip (e.g., a baseband chip), the receiving module 1030 may be an input interface of the chip (or, if the input interface and the output interface may be the same interface, the transmitting module 1020 and the receiving module 1030 are considered to be the same functional module, i.e., an input-output interface of the chip), the processing module 1010 may be a processor (or, a processing circuit) of the chip system, and the processor may include one or more central processing units. It should be understood that the processing module 1010 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component (or, a processing circuit), the receiving module 1030 may be implemented by a transceiver or a transceiver-related circuit component, and the transmitting module 1020 may be implemented by a transmitter or a transmitter-related circuit component.

For example, processing module 1010 may be used to perform all operations performed by the first terminal device in the embodiment shown in fig. 5 except transceiving operations, such as operations to determine a size relationship between the first and second periods, and/or other processes to support the techniques described herein. The transmitting module 1020 may be used to perform all of the transmitting operations performed by the first terminal device in the embodiment shown in fig. 5, e.g., S502, S504, and S507, and/or other processes for supporting the techniques described herein. The receiving module 1030 may be used to perform all receiving operations performed by the first terminal device in the embodiment shown in fig. 5, e.g., S501, S506, and S510, and/or other processes for supporting the techniques described herein.

In addition, the transmitting module 1020 and the receiving module 1030 may be one functional module, which can perform both the transmitting operation and the receiving operation, and may be referred to as a transceiver module, for example, the transceiver module may be used to perform all the transmitting operation and the receiving operation performed by the first terminal device in the embodiment shown in fig. 5, for example, when the transmitting operation is performed, the transceiver module may be considered as the transmitting module, and when the receiving operation is performed, the transceiver module may be considered as the receiving module; alternatively, the sending module 1020 and the receiving module 1030 may also be two functional modules, the transceiver module may also be regarded as a general term for the two functional modules, the sending module 1020 is configured to complete the sending operation, for example, the sending module 1020 may be configured to perform all sending operations performed by the first terminal device in the embodiment shown in fig. 5, and the receiving module 1030 is configured to complete the receiving operation, for example, the receiving module 1030 may be configured to perform all receiving operations performed by the first terminal device in the embodiment shown in fig. 5.

A receiving module 1030, configured to receive a first identifier from a second terminal device, where the first identifier is an identifier of the second terminal device, the second terminal device provides a relay service for a first terminal device 1000, and the first identifier is used to determine a paging occasion of the second terminal device;

a sending module 1020, configured to send a first message to a first core network device, where the first message includes the first identifier, the first message is used to request to update an identifier of a first terminal device 1000 according to the first identifier, and the first core network device serves the first terminal device 1000;

the receiving module 1030 is further configured to receive a second identifier from the first core network device, where the second identifier is an updated identifier of the first terminal device 1000, and the second identifier is used to determine a paging occasion of the first terminal device 1000.

As an optional implementation manner, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device 1000, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

As an optional implementation manner, the receiving module 1030 is further configured to receive the first range information from the second terminal device.

As an optional implementation manner, the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

As an optional implementation manner, the first message further includes a first cause value, where the first cause value is used to indicate that the first terminal device 1000 is a far-end terminal device.

As an alternative to the above-described embodiment,

a receiving module 1030, further configured to receive a first cycle from the second terminal device, where the first cycle is a DRX cycle of the second terminal device;

the receiving module 1030 is further configured to send a second message to the second terminal device when the processing module 1010 determines that the length of the second cycle is smaller than the length of the first cycle, where the second message includes the second cycle, and the second cycle is a DRX cycle of the first terminal device 1000.

As an optional implementation manner, the second message is further used to indicate that the length of the DRX cycle is modified to the length of the second cycle.

As an optional implementation manner, the second identifier is carried in a configuration update message or carried in a registration completion message.

As an optional implementation manner, the sending module 1020 is further configured to send the second identifier to the second terminal device, where the second identifier is used by the second terminal device to monitor paging for the first terminal device 1000.

As an optional implementation manner, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device, where mod represents a modulo operation.

As an alternative to the above-described embodiment,

a sending module 1020, configured to send a request message to the access network device, where the request message is used to request to enter an RRC unconnected state;

the receiving module 1030 is further configured to receive an acknowledgement message from the access network device, where the acknowledgement message is used to instruct the first terminal device 1000 to enter the RRC non-connected state.

For other functions that can be implemented by the first terminal device 1000, reference may be made to the related description of the embodiment shown in fig. 5, and details are not repeated.

Fig. 11 is a schematic block diagram of a communication device 1100 provided in an embodiment of the present application. Exemplarily, the communication apparatus 1100 is, for example, a second terminal device 1100. Illustratively, the second terminal device 1100 is, for example, the second terminal device described in the embodiment shown in fig. 5.

The second terminal device 1100 includes a transmitting module 1120 and a receiving module 1130. Optionally, the second terminal device may further include a processing module 1110. The second terminal device 1100 may be a terminal device, or may be a chip applied to the terminal device or other combined devices, components, and the like having the functions of the second terminal device. When the second terminal device 1100 is a terminal device, the transmitting module 1120 may be a transmitter, the transmitter may include an antenna, a radio frequency circuit, and the like, the receiving module 1130 may be a receiver, the receiver may include an antenna, a radio frequency circuit, and the like, wherein the transmitter and the receiver may be different modules, respectively, or the transmitter and the receiver may be disposed in the same functional module, which may be called a transceiver, and the processing module 1110 may be a processor (or processing circuit), such as a baseband processor, which may include one or more CPUs therein. When the second terminal device 1100 is a component having the functions of the second terminal device, the transmitting module 1120 may be a radio frequency unit, and the receiving module may also be a radio frequency unit, wherein the transmitter and the receiver may be different modules respectively, or the transmitter and the receiver may be disposed in the same functional module, which may be a radio frequency unit, and the processing module 1110 may be a processor (or a processing circuit), such as a baseband processor. When the second terminal device 1100 is a chip system, the transmitting module 1120 may be an output interface of a chip (e.g., a baseband chip), the receiving module 1130 may be an input interface of the chip (or, if the input interface and the output interface may be the same interface, the transmitting module 1120 and the receiving module 1130 are considered to be the same functional module, i.e., an input-output interface of the chip), the processing module 1110 may be a processor (or, a processing circuit) of the chip system, and the processor may include one or more central processing units. It is understood that the processing module 1110 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component (or, a processing circuit), the receiving module 1130 may be implemented by a transceiver or a transceiver-related circuit component, and the transmitting module 1120 may be implemented by a transmitter or a transmitter-related circuit component.

For example, processing module 1110 may be used to perform all operations performed by the second terminal device in the embodiment shown in fig. 5, except for transceiving operations, e.g., S503 and S508, and/or other processes for supporting the techniques described herein. The transmitting module 1120 may be configured to perform all of the transmitting operations performed by the second terminal device in the embodiment shown in fig. 5, e.g., S501, S503, S508, and S510, and/or other processes for supporting the techniques described herein. The receiving module 1130 may be used to perform all receiving operations performed by the second terminal device in the embodiment shown in fig. 5, such as S502, S503, S507, S508, and S509, and/or other processes for supporting the techniques described herein.

In addition, regarding the implementation of the transmitting module 1120 and the receiving module 1130, reference may be made to the introduction of the implementation of the transmitting module 1020 and the receiving module 1030.

The sending module 1020 is configured to send a first identifier to a first terminal device, where the first identifier is an identifier of a second terminal device 1100, where the second terminal device 1100 provides a relay service for the first terminal device, and the first identifier is used to determine a paging occasion of the second terminal device 1100;

a receiving module 1030, configured to receive a second identifier from the first terminal device, where the second identifier is an identifier of the first terminal device, and the second identifier is determined according to the first identifier, and the second identifier is used to determine a paging occasion of the first terminal device.

As an optional implementation manner, the sending module 1020 is further configured to send first range information to the first terminal device, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

As an alternative to the above-described embodiment,

a processing module 1010, configured to determine a paging occasion according to the second identifier;

the receiving module 1030 is further configured to monitor paging for the first terminal device according to the paging occasion.

As an alternative to the above-described embodiment,

a sending module 1020, configured to send a first period to the first terminal device, where the first period is a period of a second terminal device 1100;

the receiving module 1030 is further configured to receive a second message from the first terminal device, where the second message includes a second cycle, the second cycle is a DRX cycle of the first terminal device, and a length of the second cycle is smaller than a length of the first cycle.

As an optional implementation manner, the processing module 1010 is further configured to negotiate a DRX cycle of the second terminal device 1100 with a second core network device, where a length of the negotiated DRX cycle of the second terminal device 1100 is the same as a length of the second cycle, and the second core network device serves the second terminal device 1100.

As an optional implementation manner, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the second terminal device 1100, where mod represents a modulo operation.

For other functions that can be implemented by the second terminal device 1100, reference may be made to the related description of the embodiment shown in fig. 5, which is not repeated herein.

Fig. 12 is a schematic block diagram of a communication device 1200 according to an embodiment of the present application. Exemplarily, the communication apparatus 1200 is, for example, the second terminal device 1200.

The second terminal apparatus 1200 includes a transmitting module 1220 and a receiving module 1230. Optionally, the second terminal device 1200 further includes a processing module 1210. The second terminal device 1200 may be a terminal device, or may be a chip applied in the terminal device or other combined devices, components, and the like having the functions of the second terminal device. When the second terminal device 1200 is a terminal device, the transmitting module 1220 may be a transmitter, the transmitter may include an antenna, a radio frequency circuit, and the like, the receiving module 1230 may be a receiver, the receiver may include an antenna, a radio frequency circuit, and the like, wherein the transmitter and the receiver may be different modules, respectively, or the transmitter and the receiver may be disposed in the same functional module, which may be called a transceiver, and the processing module 1210 may be a processor (or processing circuit), such as a baseband processor, which may include one or more CPUs. When the second terminal device 1200 is a component having the functions of the second terminal device, the transmitting module 1220 may be a radio frequency unit, and the receiving module may also be a radio frequency unit, wherein the transmitter and the receiver may be different modules respectively, or the transmitter and the receiver may be disposed in the same functional module, which may be a radio frequency unit, and the processing module 1210 may be a processor (or processing circuit), such as a baseband processor. When the second terminal apparatus 1200 is a chip system, the transmitting module 1220 may be an output interface of a chip (e.g., a baseband chip), the receiving module 1230 may be an input interface of the chip (or, if the input interface and the output interface may be the same interface, the transmitting module 1220 and the receiving module 1230 are considered to be the same functional module, i.e., an input-output interface of the chip), the processing module 1210 may be a processor (or, a processing circuit) of the chip system, and the processor may include one or more central processing units. It is to be understood that the processing module 1210 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component (or, a processing circuit), the receiving module 1230 may be implemented by a transceiver or a transceiver-related circuit component, and the sending module 1220 may be implemented by a transmitter or a transmitter-related circuit component.

For example, the processing module 1210 may be configured to perform all operations performed by the second terminal device in the embodiment shown in fig. 9 except for transceiving operations, e.g., S905, and/or other processes for supporting the techniques described herein. The transmitting module 1220 may be used to perform all of the transmitting operations performed by the second terminal device in the embodiment shown in fig. 9, e.g., S902, S905, and S907, and/or other procedures for supporting the techniques described herein. The receiving module 1230 may be configured to perform all receiving operations performed by the second terminal device in the embodiment shown in fig. 9, such as S502, S503, S507, S901, S904, S905, and S906, and/or other processes for supporting the techniques described herein.

In addition, regarding the implementation of the transmitting module 1220 and the receiving module 1230, reference may be made to the description of the implementation of the transmitting module 1020 and the receiving module 1030.

The receiving module 1230 is configured to receive a first identifier from a first terminal device, where the first identifier is an identifier of the first terminal device, and the first identifier is used to determine a paging occasion of the first terminal device;

a sending module 1220, configured to send a first message to a second core network device, where the first message includes the first identifier, the first message is used to request to update an identifier of the second terminal device 1200 according to the first identifier, and the second core network device serves the second terminal device 1200;

the receiving module 1230 is further configured to receive a second identifier from the second core network device, where the second identifier is an updated identifier of the second terminal device 1200, and the second identifier is used to determine a paging occasion of the second terminal device 1200.

As an optional implementation manner, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of the second terminal device 1200, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

As an optional implementation manner, the first message further includes a first cause value, where the first cause value is used to indicate that the second terminal device is a relay terminal device.

As an optional implementation manner, the first identifier is a first value, and the first value is a value of (5G-S-TMSI mod 1024) of the first terminal device, where mod represents a modulo operation.

As an alternative to the above-described embodiment,

a processing module 1210, configured to determine a paging occasion according to the first identifier;

the receiving module 1230 is further configured to monitor paging for the first terminal device according to the paging occasion.

For other functions that can be implemented by the second terminal device 1200, reference may be made to the related description of the embodiment shown in fig. 9, and details are not repeated.

The embodiment of the application also provides a communication device, and the communication device can be terminal equipment or a circuit. The communication apparatus may be configured to perform the actions performed by the terminal device (e.g., the first device may be a terminal device) in the above-described method embodiments.

When the communication apparatus is a terminal device, fig. 13 shows a simplified structural diagram of the terminal device. For easy understanding and illustration, in fig. 13, the terminal device is exemplified by a mobile phone. As shown in fig. 13, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 13. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, an antenna and a radio frequency circuit having a transceiving function may be regarded as a transceiving unit of a terminal device (the transceiving unit may be a functional unit, and the functional unit is capable of implementing a transmitting function and a receiving function, or the transceiving unit may also include two functional units, which are respectively a receiving unit capable of implementing a receiving function and a transmitting unit capable of implementing a transmitting function), and a processor having a processing function may be regarded as a processing unit of the terminal device. As shown in fig. 13, the terminal device includes a transceiving unit 1310 and a processing unit 1320. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Alternatively, a device for implementing the receiving function in the transceiving unit 1310 may be regarded as a receiving unit, and a device for implementing the transmitting function in the transceiving unit 1310 may be regarded as a transmitting unit, that is, the transceiving unit 1310 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

It should be understood that the transceiving unit 1310 may be configured to perform the transmitting operation and the receiving operation on the first terminal device side in the embodiment shown in fig. 5, and the processing unit 1320 is configured to perform other operations besides the transceiving operation on the first terminal device in the embodiment shown in fig. 5.

Alternatively, the transceiving unit 1310 may be configured to perform the transmitting operation and the receiving operation on the second terminal device side in the embodiment shown in fig. 5, and the processing unit 1320 is configured to perform other operations besides the transceiving operation on the second terminal device in the embodiment shown in fig. 5.

Alternatively, the transceiving unit 1310 may be configured to perform the transmitting operation and the receiving operation on the second terminal device side in the embodiment shown in fig. 9, and the processing unit 1320 is configured to perform other operations besides the transceiving operation on the second terminal device in the embodiment shown in fig. 9.

When the communication device is a chip-like device or circuit, the device may comprise a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit and/or a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit.

When the communication device in this embodiment is a terminal device, reference may be made to the device shown in fig. 14. As an example, the device may perform functions similar to processing module 1010 of FIG. 10. For example, the processing module 1010 in the above embodiments may be the processor 1410 in fig. 14, and performs the corresponding functions; the sending module 1020 in the above embodiments may be the sending data processor 1420 in fig. 14, and performs corresponding functions; the receiving module 1030 in the above embodiments may be the received data processor 1430 in fig. 14, and performs corresponding functions. For another example, the processing module 1110 in the above embodiments may be the processor 1410 in fig. 14, and performs the corresponding functions; the transmitting module 1120 in the above embodiments may be the transmitting data processor 1420 in fig. 14, and performs the corresponding functions; the receiving module 1130 in the above embodiments may be the received data processor 1430 in fig. 14, and performs corresponding functions. As another example, the processing module 1210 in the above embodiments may be the processor 1410 in fig. 14, and performs corresponding functions; the sending module 1220 in the above embodiments may be the sending data processor 1420 in fig. 14, and performs the corresponding functions; the receiving module 1230 in the above embodiments may be the received data processor 1430 in fig. 14, and performs corresponding functions. Although fig. 14 shows a channel encoder and a channel decoder, it is understood that these blocks are not limitative and only illustrative to the present embodiment.

Fig. 15 shows another form of the present embodiment. The processing device 1500 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems. The communication device in this embodiment may serve as a modulation subsystem therein. In particular, the modulation subsystem may include a processor 1503 and an interface 1504. The processor 1503 performs the functions of the processing module 1010, and the interface 1504 performs the functions of the sending module 1020 and the receiving module 1030. Alternatively, the processor 1503 performs the functions of the processing module 1110, and the interface 1504 performs the functions of the transceiver module 1120. Alternatively, the processor 1503 performs the functions of the processing module 1210, and the interface 1504 performs the functions of the sending module 1220 and the receiving module 1230. As another variation, the modulation subsystem includes a memory 1506, a processor 1503, and a program stored in the memory 1506 and executable on the processor, and the processor 1503 executes the program to implement the method of the terminal device side in the above method embodiments. It should be noted that the memory 1506 may be non-volatile or volatile, and may be located within the modulation subsystem or within the processing device 1500, as long as the memory 1506 is connected to the processor 1503.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in Random Access Memory (RAM), flash memory, read-only memory (ROM), EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one or more exemplary designs, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store program code in the form of instructions or data structures and which can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Additionally, any connection is properly termed a computer-readable medium, and, thus, is included if the software is transmitted from a website, server, or other remote source over a coaxial cable, fiber optic computer, twisted pair, Digital Subscriber Line (DSL), or wirelessly, e.g., infrared, radio, and microwave. Such discs (disks) and disks (discs) include compact disks, laser disks, optical disks, Digital Versatile Disks (DVDs), floppy disks and blu-ray disks, where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included in the computer-readable medium.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the embodiments of the present application in further detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application. The foregoing description of the embodiments of the present application is provided to enable any person skilled in the art to make or use the teachings of the embodiments of the present application, and any modifications based on the disclosed teachings should be considered obvious to those skilled in the art, and the general principles described in the embodiments of the present application may be applied to other variations without departing from the inventive concept and scope of the present application. Thus, the disclosure of the embodiments of the present application is not intended to be limited to the embodiments and designs described, but is to be accorded the widest scope consistent with the principles of the application and novel features disclosed.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made thereto without departing from the spirit and scope of the embodiments of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the embodiments of the present application are intended to include such modifications and variations as well.

In combination with the above, the present application also provides the following embodiments:

embodiment 1, a communication method, comprising:

a first terminal device receives a first identifier from a second terminal device, wherein the first identifier is an identifier of the second terminal device, the second terminal device provides a relay service for the first terminal device, and the first identifier is used for determining a paging occasion of the second terminal device;

the first terminal device sends a first message to a first core network device, the first message includes the first identifier, the first message is used for requesting to update the identifier of the first terminal device according to the first identifier, and the first core network device serves the first terminal device;

and the first terminal equipment receives a second identifier from the first core network equipment, wherein the second identifier is an updated identifier of the first terminal equipment, and the second identifier is used for determining the paging occasion of the first terminal equipment.

Embodiment 2, according to the method of embodiment 1, the first message further includes first range information, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device, or a range to which a time-domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

Embodiment 3, the method of embodiment 2, further comprising:

Embodiment 4, according to the method described in embodiment 2 or embodiment 3, a paging occasion determined according to the first identifier is the same as a paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

Embodiment 5, according to the method in any one of embodiments 1 to 4, wherein the first message further includes a first cause value, and the first cause value is used to indicate that the first terminal device is a remote terminal device.

Embodiment 6, the method of any of embodiments 1-5, further comprising:

Embodiment 7, according to the method of embodiment 6, the second message is further used to instruct to modify the length of the DRX cycle to the length of the second cycle.

8. A method according to any of claims 1 to 7, wherein the second identity is carried in a configuration update message or in a registration complete message.

Embodiment 9, the method of any of embodiments 1-8, further comprising:

Embodiment 10 and the method according to any one of embodiments 1 to 9, wherein the first flag is a first value, and the first value is a value of 5G-S-TMSI mod 1024 of the second terminal device, where mod represents a modulo operation.

Embodiment 11, the method of any of embodiments 1-10, further comprising:

Embodiment 12, a communication method, comprising:

a second terminal device sends a first identifier to a first terminal device, wherein the first identifier is an identifier of the second terminal device, the second terminal device provides a relay service for the first terminal device, and the first identifier is used for determining a paging occasion of the second terminal device;

and the second terminal equipment receives a second identifier from the first terminal equipment, wherein the second identifier is the identifier of the first terminal equipment, the second identifier is determined according to the first identifier, and the second identifier is used for determining the paging occasion of the first terminal equipment.

Embodiment 13, the method of embodiment 12, further comprising:

Embodiment 14, the method according to embodiment 12 or embodiment 13, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

Embodiment 15, the method of any of embodiments 12-14, further comprising:

Embodiment 16, the method of any of embodiments 12-14, further comprising:

Embodiment 17, the method of embodiment 16, wherein the second message is further used to indicate to modify the length of the DRX cycle to the length of the second cycle.

Embodiment 18, the method of embodiment 16 or embodiment 17, further comprising:

Embodiment 19 and the method according to any one of embodiments 12 to 18, wherein the first flag is a first value, and the first value is a value of 5G-S-TMSI mod 1024 of the second terminal device, where mod represents a modulo operation.

Embodiment 20, a method of communication, comprising:

a second terminal device receives a first identifier from a first terminal device, wherein the first identifier is the identifier of the first terminal device, and the first identifier is used for determining a paging occasion of the first terminal device;

the second terminal device sends a first message to a second core network device, the first message includes the first identifier, the first message is used for requesting to update the identifier of the second terminal device according to the first identifier, and the second core network device serves the second terminal device;

and the second terminal equipment receives a second identifier from the second core network equipment, wherein the second identifier is an updated identifier of the second terminal equipment, and the second identifier is used for determining the paging occasion of the second terminal equipment.

Embodiment 21 and the method according to embodiment 20, wherein the first message further includes first range information, and the first range information is used to indicate a first range, where the first range is a value range of an identifier of the first terminal device, or a range to which a time-domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

Embodiment 22, the method according to embodiment 20 or embodiment 21, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

Embodiment 23 and the method according to any one of embodiments 20 to 22, wherein the first message further includes a first cause value, and the first cause value is used to indicate that the second terminal device is a relay terminal device.

Embodiment 24 and the method as in any one of embodiments 20 to 23, wherein the second identifier is carried in a configuration update message or a registration complete message.

Embodiment 25 and the method according to any one of embodiments 20 to 24, wherein the first flag is a first value, and the first value is a value of 5G-S-TMSI mod 1024 of the second terminal device, where mod represents a modulo operation.

Embodiment 26, the method of any of embodiments 20-25, further comprising:

and the second terminal equipment monitors paging for the second terminal equipment according to the paging occasion.

Embodiment 27, a communication device, comprising:

a receiving module, configured to receive a first identifier from a second terminal device, where the first identifier is an identifier of the second terminal device, and the second terminal device provides a relay service for the communication apparatus, and the first identifier is used to determine a paging occasion of the second terminal device;

a sending module, configured to send a first message to a first core network device, where the first message includes the first identifier, the first message is used to request to update an identifier of the communication apparatus according to the first identifier, and the first core network device serves the communication apparatus;

the receiving module is further configured to receive a second identifier from the first core network device, where the second identifier is an updated identifier of the communication apparatus, and the second identifier is used to determine a paging occasion of the communication apparatus.

Embodiment 28, the communication apparatus according to embodiment 27, wherein the first message further includes first range information, and the first range information is used to indicate a first range, where the first range is a value range of an identifier of the communication apparatus, or a range to which a time-domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

Embodiment 29, the communications apparatus according to embodiment 28, wherein the receiving module is further configured to receive the first range information from the second terminal device.

Embodiment 30, the communication apparatus of embodiment 28 or embodiment 29, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

Embodiment 31, the communication apparatus according to any of embodiments 27 to 30, wherein the first message further includes a first cause value indicating that the communication apparatus is a remote terminal device.

Embodiment 32, the communication device of any of embodiments 27-31, further comprising a processing module;

the sending module is further configured to send a second message to the second terminal device when the processing module determines that the length of the second cycle is smaller than the length of the first cycle, where the second message includes the second cycle, and the second cycle is a DRX cycle of the communication apparatus.

Embodiment 33, the communications apparatus of embodiment 32, the second message further indicating to modify the length of the DRX cycle to the length of the second cycle.

Embodiment 34 and the communication device of any of embodiments 27 to 33, wherein the second identifier is carried in a configuration update message or a registration complete message.

Embodiment 35, the communication apparatus according to any one of embodiments 27 to 34, wherein the sending module is further configured to send the second identifier to the second terminal device, and the second identifier is used by the second terminal device to listen for paging for the communication apparatus.

Embodiment 36 and the communication apparatus according to any one of embodiments 27 to 35, wherein the first flag is a first value, and the first value is a value of 5G-S-TMSI mod 1024 of the second terminal device, where mod represents a modulo operation.

Embodiment 37 the communication device according to any one of embodiments 27 to 36,

the receiving module is further configured to receive an acknowledgement message from the access network device, where the acknowledgement message is used to instruct the communication apparatus to enter the RRC non-connected state.

Embodiment 38, a communication device, comprising:

a sending module, configured to send a first identifier to a first terminal device, where the first identifier is an identifier of the communication apparatus, where the communication apparatus provides a relay service for the communication apparatus, and the first identifier is used to determine a paging occasion of the communication apparatus;

a receiving module, configured to receive a second identifier from the first terminal device, where the second identifier is an identifier of the first terminal device, and the second identifier is determined according to the first identifier, and the second identifier is used to determine a paging occasion of the first terminal device.

Embodiment 39, the communication apparatus according to embodiment 38, wherein the sending module is further configured to send first range information to the first terminal device, where the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

Embodiment 40, the communications apparatus of embodiment 38 or embodiment 39, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

Embodiment 41 the communication device of any of embodiments 38-40, further comprising a processing module;

Embodiment 42 the communication device of any one of embodiments 38-40,

the sending module is further configured to send a first period to the first terminal device, where the first period is a period of the communication apparatus;

Embodiment 43 the communications apparatus of embodiment 42, wherein the second message is further configured to instruct to modify the length of the DRX cycle to the length of the second cycle.

Embodiment 44, the communication apparatus according to embodiment 42 or embodiment 43, further comprising a processing module, configured to negotiate a DRX cycle of the communication apparatus with a second core network device, where a length of the negotiated DRX cycle of the communication apparatus is the same as a length of the second cycle, and the second core network device serves the communication apparatus.

Embodiment 45 and the communication apparatus according to any one of embodiments 38 to 44, wherein the first flag is a first value, and the first value is a value of 5G-S-TMSI mod 1024 of the second terminal device, where mod represents a modulo operation.

Embodiment 46, a communication device, comprising:

a receiving module, configured to receive a first identifier from a first terminal device, where the first identifier is an identifier of the first terminal device, and the first identifier is used to determine a paging occasion of the first terminal device;

a sending module, configured to send a first message to a second core network device, where the first message includes the first identifier, the first message is used to request to update an identifier of the communication apparatus according to the first identifier, and the second core network device serves the communication apparatus;

the receiving module is further configured to receive a second identifier from the second core network device, where the second identifier is an updated identifier of the communication apparatus, and the second identifier is used to determine a paging occasion of the communication apparatus.

Embodiment 47, the communication apparatus according to embodiment 46, wherein the first message further includes first range information, and the first range information is used to indicate a first range, where the first range is a value range of an identifier of the first terminal device, or a range to which a time domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

Embodiment 48, the communication apparatus of embodiment 46 or embodiment 47, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

Embodiment 49, the communication device according to any of embodiments 46 to 48, wherein the first message further includes a first cause value indicating that the communication device is a relay terminal apparatus.

Embodiment 50, the communication device of any of embodiments 46-49, wherein the second identifier is carried in a configuration update message or in a registration complete message.

Embodiment 51, the communication apparatus according to any one of embodiments 46 to 50, wherein the first flag is a first value, and the first value is a value of 5G-S-TMSI mod 1024 of the communication apparatus, where mod represents a modulo operation.

Embodiment 52, the communication device of any of embodiments 46-51, further comprising a processing module;

the receiving module is further configured to monitor paging for the second terminal device according to the paging occasion.

Embodiment 53, a communication device, wherein the communication device comprises a processor and a transceiver (or a transmitter and a processor), the processor and the transceiver (or the transmitter and the processor) being coupled to be capable of performing the method as described in any one of embodiments 1 to 11, or to perform the method as described in any one of embodiments 12 to 19, or to perform the method as described in any one of embodiments 20 to 26.

Embodiment 54, a chip comprising a processor, the processor configured to perform the method of any of embodiments 1 to 11 above, or to perform the method of any of embodiments 12 to 19, or to perform the method of any of embodiments 20 to 26 when the processor executes instructions. The instructions may come from memory internal to the chip or from memory external to the chip. Optionally, the chip further comprises an input-output circuit.

Embodiment 55, a communication system comprising the communication apparatus of any one of embodiments 27 to 37 and comprising the communication apparatus of any one of embodiments 38 to 45.

Embodiment 56, a communication system, wherein the communication system comprises the communication device of any one of embodiments 46 to 52.

Embodiment 57 a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program which, when run on a computer, causes the computer to perform the method as described in any one of embodiments 1 to 11, or to perform the method as described in any one of embodiments 12 to 19, or to perform the method as described in any one of embodiments 20 to 26.

Embodiment 58, a computer program product for storing a computer program which, when executed by a computer, the computer may implement the method of any one of embodiments 1 to 11, or the method of any one of embodiments 12 to 19, or the method of any one of embodiments 20 to 26.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A method of communication, comprising:

2. The method of claim 1, wherein the first message further includes first range information, and the first range information is used to indicate a first range, and the first range is a value range of an identifier of the first terminal device, or a range to which a time-domain distance between a paging occasion determined according to the first identifier and a paging occasion determined according to the second identifier belongs.

3. The method of claim 2, further comprising:

4. The method according to claim 2 or 3, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or wherein a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

5. The method according to any of claims 1 to 4, wherein the first message further comprises a first cause value, and the first cause value is used to indicate that the first terminal device is a remote terminal device.

6. The method according to any one of claims 1 to 5, further comprising:

7. The method of claim 6, wherein the second message is further used to indicate to modify the length of DRX cycle to the length of the second cycle.

9. The method according to any one of claims 1 to 8, further comprising:

10. The method according to any one of claims 1 to 9, wherein the first identifier is a first value, and the first value is a value of 5G-S-TMSImod 1024 of the second terminal device, where mod represents a modulo operation.

11. The method according to any one of claims 1 to 10,

the first terminal equipment sends a request message to access network equipment, wherein the request message is used for requesting to enter an RRC non-connection state;

the first terminal device receives a confirmation message from an access network device, wherein the confirmation message is used for indicating the first terminal device to enter an RRC non-connected state.

12. A method of communication, comprising:

13. The method of claim 12, further comprising:

14. The method according to claim 12 or 13, wherein the paging occasion determined according to the first identifier is the same as the paging occasion determined according to the second identifier, or wherein a time-domain distance between the paging occasion determined according to the first identifier and the paging occasion determined according to the second identifier is smaller than a first threshold.

15. The method according to any one of claims 12 to 14, further comprising:

16. The method according to any one of claims 12 to 14, further comprising:

17. The method of claim 16, wherein the second message is further used to indicate modification of the length of the DRX cycle to the length of the second cycle.

18. The method according to claim 16 or 17, further comprising:

19. The method according to any one of claims 12 to 18, wherein the first identifier is a first value, and the first value is a value of 5G-S-TMSImod 1024 of the second terminal device, where mod represents a modulo operation.

20. A communication device comprising a receiving module, a transmitting module and a processing module, the receiving module, the transmitting module and the processing module being coupled to be able to perform the method of any of claims 1 to 11 or to perform the method of any of claims 12 to 19.

21. A computer-readable storage medium, for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 11 or causes the computer to perform the method of any one of claims 12 to 19.