Patent Publication Number: US-11659616-B2

Title: Resource configuration method and device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/786,022, filed on Feb. 10, 2020, which is a continuation of International Application No. PCT/CN2017/096934, filed on Aug. 10, 2017. All of the afore-mentioned patent applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     This application relates to the field of communications technologies, and in particular, to a resource configuration method and a device. 
     BACKGROUND 
     A narrowband internet of things (narrow band internet of things, NB-IoT) system is constructed in a cellular network, may occupy a minimum bandwidth of approximately 180 kHz, and may be directly deployed in a global system for mobile communications (global system for mobile communication, GSM) system, a universal mobile telecommunications system (UMTS), or a long term evolution (LIE) system, to reduce deployment costs and implement a smooth upgrade. 
     Currently, to meet requirements such as low costs and deep coverage, an NB-IoT system has many special designs. For example, the NB-IoT system has no physical uplink control channel (PUCCH) channel, to simplify a terminal device and reduce costs. Correspondingly, because NB-IoT has no PUCCH, the terminal device cannot be supported in applying for an uplink resource on a PUCCH by using a scheduling request (SR). When the terminal device needs to send uplink data, the terminal device can apply for the uplink resource only in a random access process, and consequently power consumption is relatively high. In addition, if the terminal device needs to transmit a relatively large amount of data, a base station needs to send a physical downlink control channel (PDCCH) to each transport block (TB) to schedule the uplink resource. In this way, network resources are definitely wasted due to a large quantity of PDCCHs. 
     In this case, the foregoing problem may be resolved through semi-persistent scheduling (SPS). However, an SPS mechanism in a conventional long term evolution (LTE) system is mainly designed for a voice service in the LTE system. To be specific, the base station may determine, based on quality of service (QoS) of a service, whether the service is a voice service. If the service is a voice service, the base station determines that SPS can be configured for the service. 
     However, if an SPS application scenario in the NB-IoT system is not for a voice service, the base station may not determine whether SPS needs to be configured. In this case, a dynamic scheduling manner is used. It can be learned from the foregoing descriptions that resources are wasted due to the dynamic scheduling manner. 
     SUMMARY 
     Embodiments of this application provide a resource configuration method and a device, to reduce a resource waste. 
     According to a first aspect, a resource configuration method is provided. The method may be performed by a terminal device. The method includes: applying, by a terminal device, to a network device for semi-persistent scheduling; receiving, by the terminal device, configuration information sent by the network device, where the configuration information is used to configure a first semi-persistent scheduling resource for the terminal device; configuring, by the terminal device, the first semi-persistent resource for the terminal device based on the configuration information; and sending, by the terminal device, uplink data to the network device on the first semi-persistent scheduling resource. 
     According to a second aspect, a resource configuration method is provided. The method may be performed by a network device, and the network device is, for example, a base station. The method includes: determining, by a network device, that a terminal device applies for semi-persistent scheduling; sending, by the network device, configuration information to the terminal device, where the configuration information is used to configure a first semi-persistent scheduling resource for the terminal device; and receiving, by the network device on the first semi-persistent scheduling resource, uplink data sent by the terminal device. 
     In this embodiment of this application, the terminal device applies to the network device for semi-persistent scheduling. Therefore, after receiving the application from the terminal device, the network device may configure semi-persistent scheduling for the terminal device, and the network device does not need to determine whether semi-persistent scheduling needs to be configured for the terminal device, so that a configuration result better meets a requirement of the terminal device. This can also reduce a resource waste caused by a dynamic scheduling manner used because the network device cannot determine whether semi-persistent scheduling needs to be configured. 
     In a possible design, before the terminal device applies to the network device for semi-persistent scheduling, the terminal device receives a broadcast message sent by the network device. The broadcast message is used to indicate that the network device supports semi-persistent scheduling; or the broadcast message is used to indicate a random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling. Correspondingly, before the network device determines that the terminal device applies for semi-persistent scheduling, the network device sends the broadcast message. The broadcast message is used to indicate that the network device supports semi-persistent scheduling; or the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling. 
     The network device may send the broadcast message in advance, to notify the terminal device that the network device supports semi-persistent scheduling, or directly indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, in other words, implicitly notify the terminal device that the network device supports semi-persistent scheduling, so that the terminal device can apply to the network device for semi-persistent scheduling, to prevent the terminal device from failing to apply. 
     In a possible design, the applying, by a terminal device, to a network device for semi-persistent scheduling includes: when the broadcast message is used to indicate that the network device supports semi-persistent scheduling, sending, by the terminal device, semi-persistent scheduling request information to the network device by using first radio resource control RRC signaling, where the semi-persistent scheduling request information is used to apply for semi-persistent scheduling; or when the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, sending, by the terminal device, a random access preamble to the network device by using a first random access resource in the reserved random access resource. Correspondingly, the determining, by a network device, that a terminal device applies for semi-persistent scheduling includes: when the broadcast message is used to indicate that the network device supports semi-persistent scheduling, determining, by the network device, that semi-persistent scheduling request information sent by the terminal device is received by using first RRC signaling, where the semi-persistent scheduling request information is used to apply for semi-persistent scheduling; or when the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, determining, by the network device, that a random access preamble sent by the terminal device is received by using a first random access resource in the reserved random access resource. 
     Because the broadcast message broadcast by the network device has different indication manners, the terminal device may apply to the network device for semi-persistent scheduling in different manners based on the different indication manners, so that the manner is relatively flexible. When the broadcast message explicitly indicates that the network device supports semi-persistent scheduling, the terminal device may explicitly apply for semi-persistent scheduling directly by using the first RRC signaling, so that the method is relatively simple and direct. When the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, the terminal device sends the random access preamble directly by using the reserved random access resource, so that the network device can know that the terminal device applies for semi-persistent scheduling, in this way, random access is performed, and semi-persistent scheduling is also applied for. 
     In a possible design, when the broadcast message is used to indicate that the network device supports semi-persistent scheduling, and the broadcast message is further used to indicate a coverage level that is of semi-persistent scheduling and that is supported by the network device, the terminal device determines, based on a coverage level of the terminal device and the coverage level that is of semi-persistent scheduling and that is supported by the network device, Whether to apply for semi-persistent scheduling. Alternatively, when the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, and the broadcast message is further used to indicate a coverage level that is of semi-persistent scheduling and that corresponds to the reserved random access resource, the terminal device determines, based on a coverage level of the terminal device and a coverage level that is of semi-persistent scheduling and that corresponds to the reserved random access resource, whether to apply for semi-persistent scheduling. Correspondingly, when the broadcast message is used to indicate that the network device supports semi-persistent scheduling, the broadcast message is further used to indicate a coverage level that is of semi-persistent scheduling and that is supported by the network device. Alternatively, when the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, the broadcast message is further used to indicate a coverage level that is of semi-persistent scheduling and that corresponds to the reserved random access resource. The coverage level is used by the terminal device to determine, based on the coverage level of the terminal device, whether to apply for semi-persistent scheduling. 
     If the broadcast message may be used to indicate the coverage level that is of semi-persistent scheduling and that is supported by the network device (the coverage level that is of semi-persistent scheduling and that corresponds to the reserved random access resource is also the coverage level that is of semi-persistent scheduling and that is supported by the network device), the terminal device can determine the coverage level of the terminal device, so that the terminal device can determine, based on the coverage level that is of semi-persistent scheduling and that is supported by the network device and the coverage level of the terminal device, whether to apply for semi-persistent scheduling. For example, if the coverage level that is of semi-persistent scheduling and that is supported by the network device includes the coverage level of the terminal device, the terminal device can apply for semi-persistent scheduling. However, if the coverage level that is of semi-persistent scheduling and that is supported by the network device does not include the coverage level of the terminal device, the terminal device cannot apply for semi-persistent scheduling. Therefore, the coverage level that is of semi-persistent scheduling and that is supported by the network device is broadcast, so that the terminal device can determine whether semi-persistent scheduling can be applied for. If semi-persistent scheduling cannot be applied for, the terminal device may apply for semi-persistent scheduling without a need to consume resources, to help reduce overheads, and also reduce a failure rate of applying for semi-persistent scheduling. 
     In a possible design, the receiving, by the terminal device, configuration information sent by the network device includes: receiving, by the terminal device, second RRC signaling sent by the network device, where the second RRC signaling carries the configuration information; and the configuration information is further used to activate the first semi-persistent scheduling resource, Correspondingly, the sending, by the network device, configuration information to the terminal device includes: sending, by the terminal device, second RRC signaling to the network device, where the second RRC signaling carries the configuration information; and the configuration information is further used to activate the first semi-persistent scheduling resource. 
     The configuration information may be sent by using RRC signaling, and the configuration information may be used to activate the first semi-persistent scheduling resource, so that there is no need to specially activate the first semi-persistent scheduling resource again, to reduce an execution step. In addition, in an LTE system, a PDCCH is further required for activating a configured semi-persistent scheduling resource. In this case, the terminal device needs to listen on the PDCCH to implement activation of the semi-persistent scheduling resource. However, in this embodiment of this application, the configuration information is sent by using the RRC signaling without a need to use the PDCCH. Therefore, the terminal device does not need to listen on the PDCCH, to reduce power consumption of the terminal device. 
     In a possible design, the configuration information is used to indicate at least one of a scheduling period of the first semi-persistent resource, a quantity of repeated transmission times, a modulation and coding scheme used on the first semi-persistent scheduling resource, and a transport block size used on the first semi-persistent scheduling resource, and the quantity of repeated transmission times is used to indicate a quantity of times of repeated transmission on the first semi-persistent scheduling resource. 
     The parameters that may be included in the configuration information are described above by using an example. In addition, in this embodiment of this application, the configuration information may further include the quantity of repeated transmission times, to help implement different coverage levels of semi-persistent scheduling. 
     In a possible design, the terminal device may further receive first indication information sent by the network device by using media access control signaling, and the first indication information is used to indicate that scheduling of the first semi-persistent scheduling resource is stopped. Correspondingly, the network device may further send first indication information to the terminal device by using media access control signaling, and the first indication information is used to indicate that scheduling of the first semi-persistent scheduling resource is stopped. 
     To be specific, in addition to configuring the first semi-persistent scheduling resource for the terminal device, the network device may stop scheduling the first semi-persistent scheduling resource. In this embodiment of this application, the network device uses the media access control signaling to indicate that scheduling of the first semi-persistent scheduling resource is stopped, and does not need to use a PDCCH for indication. Therefore, the terminal device does not need to continuously listen on the PDCCH, to help reduce power consumption of the terminal device. 
     In a possible design, the terminal device may further receive second indication information sent by the network device by using third RRC signaling. The second indication information is used to configure a second semi-persistent scheduling resource for the terminal device, or the second indication information is used to release the first semi-persistent scheduling resource; and the second semi-persistent scheduling resource is used by the terminal device to send uplink data to the network device. Correspondingly, the network device may further send second indication information to the terminal device by using third RRC signaling. The second indication information is used to configure and activate a second semi-persistent scheduling resource for the terminal device, or the second indication information is used to release the first semi-persistent scheduling resource; and the second semi-persistent scheduling resource is used by the terminal device to send uplink data to the network device. 
     To be specific, in addition to configuring the first semi-persistent scheduling resource for the terminal device, the network device may reconfigure a new semi-persistent scheduling resource, namely, the second semi-persistent scheduling resource; or may release the first semi-persistent scheduling resource. In this embodiment of this application, the network device uses RRC signaling to indicate that the new semi-persistent scheduling resource is reconfigured or the first semi-persistent scheduling resource is released, and does not need to use a PDCCH for indication. Therefore, the terminal device does not need to continuously listen on the PDCCH, to help reduce power consumption of the terminal device. 
     According to a third aspect, a method for configuring DCI is provided. The method may be performed by a network device, and the network device is, for example, a base station. The method includes: sending, by the network device, DCI format information, where the DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks; and sending, by the network device, the DCI to a terminal device. 
     According to a fourth aspect, a method for configuring DCI is provided. The method may be performed by a terminal device. The method includes: receiving, by the terminal device, DCI format information sent by a network device, where the DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks; receiving, by the terminal device, the DCI sent by the network device; and receiving, by the terminal device based on scheduling of the DCI, downlink data sent by the network device. 
     In this embodiment of this application, the DCI indicated by the DCI format information can be used to schedule the at least two transport blocks, so that semi-persistent scheduling is implemented after the DCI is used. System overheads for sending DCI to each transport block in a network are reduced, and power consumption of listening to a plurality of pieces of DCI by the terminal device is also reduced. 
     In a possible design, the sending, by the network device, DCI format information includes: sending, by the network device through a single cell multimedia broadcast multicast service control channel, first DCI format information used on a single cell multimedia broadcast multicast service traffic channel. Correspondingly, the receiving, by the terminal device, DCI format information sent by a network device includes: receiving, by the terminal device through a single cell multimedia broadcast multicast service control channel, first DCI format information that is sent by the network device and that is used on a single cell multimedia broadcast multicast service traffic channel. 
     This is a scenario in which the terminal device is in an idle mode. In this scenario, data is transmitted between the network device and the terminal device through the single cell multimedia broadcast multicast service control channel and the single cell multimedia broadcast multicast service traffic channel. Therefore, the network device may send, through the single cell multimedia broadcast multicast service control channel, the first DCI format information used on the single cell multimedia broadcast multicast service traffic channel, to configure a new DCI format. 
     In a possible design, the sending, by the network device, DCI format information further includes: broadcasting, by the network device, second DCI format information used on the single cell multimedia broadcast multicast service control channel. Correspondingly, the receiving, by the terminal device, DCI format information sent by a network device further includes: receiving, by the terminal device, second DCI format information that is broadcast by the network device and that is used on the single cell multimedia broadcast multicast service control channel. 
     In a scenario in which the terminal device is in an idle mode, data is transmitted between the network device and the terminal device through the single cell multimedia broadcast multicast service control channel and the single cell multimedia broadcast multicast service traffic channel. Therefore, the network device may also configure a new DCI format for the single cell multimedia broadcast multicast service control channel. 
     In a possible design, before the network device sends the DCI format information, the network device obtains capability information of the terminal device and/or DCI format information supported by a service performed by the network device. The capability information of the terminal device is used to indicate whether the terminal device supports the DCI format. In this case, the sending, by the network device, DCI format information includes: sending, by the network device, the DCI format information when the capability information of the terminal device indicates that the terminal device supports the DCI format, or when the service performed by the network device supports the DCI format. 
     To be specific, the network device may determine in advance the capability information of the terminal device or the DCI format information supported by the service performed by the network device, to determine whether a service performed by the terminal device or the network device supports a new DCI format, so that the network device sends the DCI format information again when the service performed by the terminal device or the network device supports the new DCI format, to avoid confusion or a fault caused because the service performed by the terminal device or the network device does not support the DCI format. 
     In a possible design, that the network device obtains capability information of the terminal device includes: receiving, by the network device, the capability information of the terminal device that is sent by the terminal device; obtaining, by the network device, the capability information of the terminal device in a random access process of the terminal device; or receiving, by the network device, the capability information of the terminal device that is sent by a core network device. Correspondingly, the terminal device further sends the capability information of the terminal device to the network device. 
     The network device may obtain the capability information of the terminal device in a plurality of different manners, so that the manner is relatively flexible. The network device may select any one of the manners based on a specific situation to obtain the capability information of the terminal device. 
     In a possible design, the network device may further send first indication information to the terminal device. The first indication information is used to indicate that application of the DCI format is suspended, or used to indicate that a new DCI format is enabled. Correspondingly, the terminal device may further receive first indication information sent by the network device. The first indication information is used to indicate that application of the DCI format is suspended, or used to indicate that a new DCI format is enabled. 
     It may be indicated that in addition to using the DCI format, the network device may enable the new DCI format, or suspend applying the DCI format, to meet different requirements. 
     According to a fifth aspect, an RRC connection release method is provided. The method may be performed by a terminal device. The method includes: receiving, by the terminal device, first media access control signaling sent by a network device, where the first media access control signaling is used to instruct the terminal device to release the RRC connection to the network device; and releasing, by the terminal device, the RRC connection based on the first media access control signaling. 
     According to a sixth aspect, an RRC connection release method is provided. The method may be performed by a network device, and the network device is, for example, a base station. The method includes: sending, by the network device, first media access control signaling to a terminal device, where the first media access control signaling is used to instruct the terminal device to release the RRC connection to the network device; and receiving, by the network device, an acknowledgment (ACK) or a negative acknowledgment (NACK) sent by the terminal device, where the ACK is used to indicate that the RRC connection is successfully released, and the NACK is used to indicate that the RRC connection fails to be released. 
     The network device uses MAC signaling (namely, the first media access control signaling) to instruct the terminal device to release the RRC connection, instead of using RRC signaling for instruction. Therefore, the terminal device does not need to send an RRC status report to the network device. The ACK/NACK is MAC layer signaling, an uplink resource required by the MAC layer signaling is scheduled by the network device, and the terminal device may directly use the uplink resource without a need to apply for scheduling again. It can be learned that after the technical solution in this embodiment of this application is used, the terminal device does not need to apply to the network device for the uplink resource again, so that power consumption of the terminal device is reduced, and an entire procedure can also be simplified. 
     In a possible design, after the releasing, by the terminal device, the RRC connection based on the media access control signaling, the method further includes: sending, by the terminal device, the ACK or the NACK to the network device, where the ACK is used to indicate that the RRC connection is successfully released, and the NACK is used to indicate that the RRC connection fails to be released. 
     In a possible design, the terminal device may further send capability information of the terminal device to the network device. The capability information of the terminal device is used to indicate whether the terminal device supports to use the media access control signaling to instruct to release the RRC connection. Correspondingly, the network device may further receive capability information of the terminal device that is sent by the terminal device. The capability information of the terminal device is used to indicate whether the terminal device supports to use the media access control signaling to instruct to release the RRC connection. In this case, the sending, by the network device, first media access control signaling to a terminal device includes: sending, by the network device, the first media access control signaling to the terminal device when the capability information of the terminal device indicates that the terminal device supports to use the media access control signaling to instruct to release the RRC connection. 
     If the terminal device may send the capability information of the terminal device to the network device, the network device may determine, based on the capability information of the terminal device, whether the terminal device supports to use the media access control signaling to instruct to release the RRC connection. If the terminal device supports to use the media access control signaling to instruct to release the RRC connection, the network device may use the media access control signaling to instruct the terminal device to release the RRC connection. However, if the terminal device does not support to use the media access control signaling to instruct to release the RRC connection, the network device does not use the media access control signaling to instruct the terminal device to release the RRC connection, for example, the network device may continue to use the RRC signaling to instruct the terminal device to release the RRC connection, so as to ensure, as much as possible, that the terminal device can normally release the RRC connection, and ensure that a communication process is normally performed. 
     According to a seventh aspect, a terminal device is provided. The terminal device has functions for implementing the terminal device in the foregoing method designs. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more units corresponding to the foregoing functions. 
     In a possible design, a specific structure of the terminal device may include a sending module, a processing module, and a receiving module. The sending module, the processing module, and the receiving module may perform corresponding functions in the method provided in any one of the first aspect or the possible designs of the first aspect. 
     According to an eighth aspect, a network device is provided. The network device has functions for implementing the network device in the foregoing method designs. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more units corresponding to the foregoing functions. 
     In a possible design, a specific structure of the network device may include a sending module, a processing module, and a receiving module. The sending module, the processing module, and the receiving module may perform corresponding functions in the method provided in any one of the second aspect or the possible designs of the second aspect. 
     According to a ninth aspect, a network device is provided. The network device has functions for implementing the network device in the foregoing method designs. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more units corresponding to the foregoing functions. 
     In a possible design, a specific structure of the network device may include a sending module and a processing module. The sending module and the processing module may perform corresponding functions in the method provided in any one of the third aspect or the possible designs of the third aspect. 
     According to a tenth aspect, a terminal device is provided. The terminal device has functions for implementing the terminal device in the foregoing method designs. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more units corresponding to the foregoing functions. 
     In a possible design, a specific structure of the terminal device may include a receiving module. Optionally, the specific structure of the terminal device may further include a sending module. The receiving module and the sending module may perform corresponding functions in the method provided in any one of the fourth aspect or the possible designs of the fourth aspect. 
     According to an eleventh aspect, a terminal device is provided. The terminal device has functions for implementing the terminal device in the foregoing method designs. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more units corresponding to the foregoing functions. 
     In a possible design, a specific structure of the terminal device may include a receiving module and a processing module. The receiving module and the processing module may perform corresponding functions in the method provided in any one of the fifth aspect or the possible designs of the fifth aspect. 
     According to a twelfth aspect, a network device is provided. The network device has functions for implementing the network device in the foregoing method designs. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more units corresponding to the foregoing functions. 
     In a possible design, a specific structure of the network device may include a sending module and a receiving module. The sending module and the receiving module may perform corresponding functions in the method provided in any one of the sixth aspect or the possible designs of the sixth aspect. 
     According to a thirteenth aspect, a communications apparatus is provided. The communications apparatus may be the terminal device in the foregoing method designs, or a chip disposed in the terminal device. The communications apparatus includes: a memory, configured to store computer executable program code; a communications interface; and a processor, where the processor is coupled to the memory and the communications interface. The program code stored in the memory includes an instruction, and when the processor executes the instruction, the communications apparatus is enabled to perform the method performed by the terminal device in any one of the first aspect or the possible designs of the first aspect. 
     According to a fourteenth aspect, a communications apparatus is provided. The communications apparatus may be the network device in the foregoing method designs, or a chip disposed in the network device. The communications apparatus includes: a memory, configured to store computer executable program code; a communications interface; and a processor, where the processor is coupled to the memory and the communications interface. The program code stored in the memory includes an instruction, and when the processor executes the instruction, the communications apparatus is enabled to perform the method performed by the network device in any one of the second aspect or the possible designs of the second aspect. 
     According to a fifteenth aspect, a communications apparatus is provided. The communications apparatus may be the network device in the foregoing method designs, or a chip disposed in the network device. The communications apparatus includes: a memory, configured to store computer executable program code; a communications interface; and a processor, where the processor is coupled to the memory and the communications interface. The program code stored in the memory includes an instruction, and when the processor executes the instruction, the communications apparatus is enabled to perform the method performed by the network device in any one of the third aspect or the possible designs of the third aspect. 
     According to a sixteenth aspect, a communications apparatus is provided. The communications apparatus may be the terminal device in the foregoing method designs, or a chip disposed in the terminal device. The communications apparatus includes: a memory, configured to store computer executable program code; a communications interface; and a processor, where the processor is coupled to the memory and the communications interface. The program code stored in the memory includes an instruction, and when the processor executes the instruction, the communications apparatus is enabled to perform the method performed by the terminal device in any one of the fourth aspect or the possible designs of the fourth aspect. 
     According to a seventeenth aspect, a communications apparatus is provided. The communications apparatus may be the terminal device in the foregoing method designs, or a chip disposed in the terminal device. The communications apparatus includes: a memory, configured to store computer executable program code; a communications interface; and a processor, where the processor is coupled to the memory and the communications interface. The program code stored in the memory includes an instruction, and when the processor executes the instruction, the communications apparatus is enabled to perform the method performed by the terminal device in any one of the fifth aspect or the possible designs of the fifth aspect. 
     According to an eighteenth aspect, a communications apparatus is provided. The communications apparatus may be the network device in the foregoing method designs, or a chip disposed in the network device. The communications apparatus includes: a memory, configured to store computer executable program code; a communications interface; and a processor, where the processor is coupled to the memory and the communications interface. The program code stored in the memory includes an instruction, and when the processor executes the instruction, the communications apparatus is enabled to perform the method performed by the network device in any one of the sixth aspect or the possible designs of the sixth aspect. 
     According to a nineteenth aspect, a computer storage medium is provided. The computer readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in any one of the first aspect or the possible designs of the first aspect. 
     According to a twentieth aspect, a computer storage medium is provided. The computer readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in any one of the second aspect or the possible designs of the second aspect. 
     According to a twenty-first aspect, a computer storage medium is provided. The computer readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in any one of the third aspect or the possible designs of the third aspect. 
     According to a twenty-second aspect, a computer storage medium is provided. The computer readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in any one of the fourth aspect or the possible designs of the fourth aspect. 
     According to a twenty-third aspect, a computer storage medium is provided. The computer readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in any one of the fifth aspect or the possible designs of the fifth aspect. 
     According to a twenty-fourth aspect, a computer storage medium is provided. The computer readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in any one of the sixth aspect or the possible designs of the sixth aspect. 
     According to a twenty-fifth aspect, a computer program product including an instruction is provided. The computer program product stores the instruction, and when the computer program product is run on a computer, the computer is enabled to perform the method in any one of the first aspect or the possible designs of the first aspect. 
     According to a twenty-sixth aspect, a computer program product including an instruction is provided. The computer program product stores the instruction, and when the computer program product is run on a computer, the computer is enabled to perform the method in any one of the second aspect or the possible designs of the second aspect. 
     According to a twenty-seventh aspect, a computer program product including an instruction is provided. The computer program product stores the instruction, and when the computer program product is run on a computer, the computer is enabled to perform the method in any one of the third aspect or the possible designs of the third aspect. 
     According to a twenty-eighth aspect, a computer program product including an instruction is provided. The computer program product stores the instruction, and when the computer program product is run on a computer, the computer is enabled to perform the method in any one of the fourth aspect or the possible designs of the fourth aspect. 
     According to a twenty-ninth aspect, a computer program product including an instruction is provided. The computer program product stores the instruction, and when the computer program product is run on a computer, the computer is enabled to perform the method in any one of the fifth aspect or the possible designs of the fifth aspect. 
     According to a thirtieth aspect, a computer program product including an instruction is provided. The computer program product stores the instruction, and when the computer program product is run on a computer, the computer is enabled to perform the method in any one of the sixth aspect or the possible designs of the sixth aspect. 
     In the embodiments of this application, the terminal device applies to the network device for semi-persistent scheduling, and the network device does not need to determine whether semi-persistent scheduling needs to be configured for the terminal device, so that a configuration result better meets a requirement of the terminal device. This can also reduce a resource waste caused by a dynamic scheduling manner used because the network device cannot determine whether semi-persistent scheduling needs to be configured. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic diagram of a working procedure of SPS in an LTE system; 
         FIG.  2    is a schematic diagram of an application scenario according to an embodiment of this application; 
         FIG.  3    is a flowchart of a resource configuration method according to an embodiment of this application; 
         FIG.  4    is a flowchart of a method for configuring DCI when the terminal device is in an idle mode according to an embodiment of this application; 
         FIG.  5    is a flowchart of a method for configuring DCI when the terminal device is in a connected mode according to an embodiment of this application; 
         FIG.  6    is a flowchart of an RRC connection release method according to an embodiment of this application; 
         FIG.  7    is a schematic structural diagram of a terminal device according to an embodiment of this application; 
         FIG.  8    is a schematic structural diagram of a network device according to an embodiment of this application; 
         FIG.  9    is a schematic structural diagram of a network device according to an embodiment of this application; 
         FIG.  10    is a schematic structural diagram of a terminal device according to an embodiment of this application; 
         FIG.  11    is a schematic structural diagram of a terminal device according to an embodiment of this application; 
         FIG.  12    is a schematic structural diagram of a network device according to an embodiment of this application; 
         FIG.  13    is a schematic structural diagram of a communications apparatus according to an embodiment of this application; 
         FIG.  14    is a schematic structural diagram of a terminal device according to an embodiment of this application; 
         FIG.  15    is a schematic structural diagram of a network device according to an embodiment of this application; 
         FIG.  16    is a schematic structural diagram of a network device according to an embodiment of this application; 
         FIG.  17    is a schematic structural diagram of a terminal device according to an embodiment of this application; 
         FIG.  18    is a schematic structural diagram of a terminal device according to an embodiment of this application; and 
         FIG.  19    is a schematic structural diagram of a network device according to an embodiment of this application. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     To make the purpose, technical solutions, and advantages of the embodiments of this application clearer, the following clearly and completely describes the technical solutions of the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. 
     Some terms of the embodiments of this application are described below; to facilitate understanding by a person skilled in the art. 
     1. Terminal device: The terminal device includes a device that provides a user with voice and/or data connectivity, for example, may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem. The terminal device may communicate with a core network through a radio access network (RAN), and exchange voice and/or data with the RAN. The terminal device may include user equipment (UE), a wireless terminal device, a mobile terminal device, a subscriber unit, a subscriber station, a mobile station, a mobile console, a remote station, an access point (AP), a remote terminal device, an access terminal device, a user terminal device, a user agent, a user device, or the like. For example, the terminal device may include a mobile phone (or referred to as a “cellular” phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, computer built-in, or in-vehicle mobile apparatus, an intelligent wearable device, or the like. For example, the terminal device includes a device such as a personal communications service (PCS) phone, a cordless telephone set, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a smartwatch, a smart helmet, smart glasses, or a smart band. The terminal device further includes a limited device, for example, a device with relatively low power consumption, a device with a limited storage capability, or a device with a limited computing capability. For example, the terminal device includes an information sensing device such as a barcode, radio frequency identification (MID), a sensor, a global positioning system (GPS), or a laser scanner. 
     2. Network device: The network device includes, for example, a base station (for example, an access point), and may be a device that communicates with a wireless terminal device over an air interface by using one or more cells in an access network. The base station may be configured to mutually convert a received over-the-air frame and an internet protocol (IP) packet, and serve as a router between the terminal device and a rest portion of the access network. The rest portion of the access network may include an IP network. The base station may further coordinate attribute management of the air interface. For example, the base station may include an evolved NodeB (eNB, or e-NodeB, evolutional NodeB) in an LIE system or an evolved LTE (LTE-Advanced, LTE-A) system, or may include a next generation NodeB (gNB) in a 5th generation (fifth generation, 5G) mobile communications technology new radio (NR) system. This is not limited in the embodiments of this application. 
     3. NB-IoT: Currently, the 3rd generation partnership project (3GPP) standard focuses on carrying an IoT service based on a cellular network by designing a new air interface and fully using a characteristic of a narrowband technology. This type of IoT is referred to as NB-IoT. Compared with a conventional cellular network, a service and a terminal device in an NB-IoT system are characterized by the following: 
     (1) Low service rate and long service period: Compared with the conventional cellular network, the NB-IoT service generates smaller data packets, and is usually insensitive to a delay. 
     (2) Massive-connection requirement: One NB-IoT base station may cover a large quantity of internet of things terminal devices such as smart water/electricity meters, smart households, vehicles, and wearable devices that are massively deployed. For example, a quantity of terminal devices may exceed tens of thousands. 
     (3) Low-cost requirement: Compared with an existing cellular network terminal device, the NB-IoT system requires a lower-cost terminal device, to implement massive deployment of terminal devices. The low-cost requirement requires that implementation complexity of the terminal device is also very low. 
     (4) Low power consumption requirement: The NB-IoT system requires lower power consumption of the terminal device, to save battery power of the terminal device, and ensure that the terminal device has an extra-long standby time, so as to reduce labor costs of battery replacement. 
     To meet the foregoing requirements such as low costs and deep coverage, the NB-IoT system has many special designs. For example, the NB-IoT system has no PUCCH, to simplify the terminal device and reduce costs. In addition, to implement deep coverage, a control channel (for example, a narrowband physical downlink control channel (narrowband physical downlink control channel, NPDCCH)), a data channel (for example, a narrowband physical downlink shared channel (narrowband physical downlink shared channel, NPDSCH), and a narrowband physical uplink shared channel (narrowband physical uplink shared channel, NPUSCH)) that are in the NB-IoT system are repeatedly sent, so that a probability that a terminal device with relatively poor coverage successfully receives same content is increased through hundreds or thousands of times of repeated sending. 
     4. SPS: Semi-persistent scheduling is also referred to as semi-persistent scheduling. An LTE system supports an SPS scheduling manner. For some relatively regular services (for example, a voice over interact protocol (VoIP)) with a small service volume, SPS may be used to allocate resources in a relatively long time at a time, and dynamic allocation does not need to be performed at each time of transmission. In such a mechanism, overheads of PDCCH control signaling are reduced. 
     5. Downlink control information (DCI): is carried on a PDCCH. The downlink control information sent by a base station to a terminal device may include uplink-downlink resource allocation, hybrid automatic repeal request (HARQ) information, power control, and the like. 
     For current DCI, one piece of DCI is usually used to schedule one TB. A new DCI format is further provided in the embodiments of this application. For DCI in the new DCI format, one piece of DCI may be used to schedule at least two TBs. In this case, there may also be a plurality of new DCI formats, and DCI used to schedule different quantities of TBs may be considered as DCI in different formats. 
     6. The terms “system” and “network” may be used interchangeably in the embodiments of this application. “A plurality of” means two or more than two. In view of this, “a plurality of” may also be understood as “at least two” in the embodiments of this application. The term “and/or” describes an association relationship for describing associated objects and represents that three relationships may exist. For example. A and/or B may represent the following three cases: Only A exists, both A and B exist, and only B exists. In addition, the character “I” usually indicates an “or” relationship between the associated objects unless specified otherwise. 
     In addition, unless otherwise stated, ordinal numbers such as “first” and “second” in the embodiments of this application are used to distinguish between a plurality of objects, but are not intended to limit a sequence, a time sequence, priorities, or importance of the plurality of objects. 
     The foregoing describes some concepts in the embodiments of this application, and the following describes a working procedure of SPS in an LTE system. 
       FIG.  1    is a schematic diagram of a working procedure of SPS in an LTE system. In the LTE system, SPS is applied only to a terminal device in a connected mode. Therefore, the terminal device needs to first set up a radio resource control (RRC) connection to a network device in a random access process. In the following descriptions, for example, the network device is a base station. 
     1. The base station sends a radio resource control connection setup (RRC connection setup) message to the terminal device. In this case, the terminal device receives the RRC connection setup message sent by the base station. 
     In the LW system, SPS is mainly designed for a voice service. The voice service is characterized by a fixed period and a fixed data rate, and therefore is relatively suitable for being scheduled in a semi-persistent scheduling manner. The base station may determine, based on QoS information of a service, whether the service is the voice service, to determine whether to configure SPS. 
     If the base station determines to configure SPS for a service, in the LTE system, SPS is configured by using RRC signaling, and earliest RRC signaling that can be used to configure SPS is RRC connection setup and is used as an example in  FIG.  1   . Alternatively, after an RRC connection is set up, SPS may be configured by using an RRC connection reconfiguration message. 
     An RRC configuration mainly includes an SPS-radio network temporary identifier (radio network temporary identity, RNTI), an SPS scheduling period, and the like that are of the terminal device. 
     2. The base station sends a PDCCH to the terminal device to activate configured SPS. In this case, the terminal device receives the PDCCH sent by the base station. 
     After SPS is configured by using the RRC signaling, SPS further needs to be activated by using a PDCCH scrambled by using the SPS-RNTI. The PDCCH further carries DCI. Only after receiving the PDCCH scrambled by using the SPS-RNTI, the terminal device determines that SPS is activated, and further performs data receiving and sending by using an SPS resource. The DCI carried on the PDCCH includes resource scheduling information, for example, includes a modulation and coding scheme (MCS) used on the SPS resource and a transport block size (TBS) used on the SPS resource. 
     The terminal device performs data receiving or sending on a corresponding periodic SPS resource based on configured SPS by using the scheduling information in the received DCI. The base station no longer needs to send the PDCCH for each SPS resource. 
     3. The base station modifies an SPS configuration, suspends SPS, or releases SPS. 
     In consideration of a network resource status and a possible change of a wireless environment of the terminal device, scheduling information used by the base station to schedule the terminal device also needs to change in a timely manner. The base station may use, at any time, the PDCCH scrambled by using the SPS-RNTI to change scheduling information used for SPS, that is, reactivate SPS. Alternatively, the base station may use, at any time, the PDCCH scrambled by using the SPS-RNTI to stop an SPS scheduling manner. 
     In addition, the base station may further use, at any time, the RRC connection reconfiguration message to release an SPS resource configured by using the RRC signaling. 
     SPS in a conventional LTE system is for a voice service. The conventional LTE system has a different SPS requirement from an NB-IoT system. In addition, an air interface design and the like that are in the conventional LTE system are also different from those in the NB-IoT system. Therefore, SPS in the conventional LTE system cannot adapt to an NB-IoT scenario well. Details are as follows: 
     a. In the LTE system, the base station may determine, based on QoS of a service, whether the service is a voice service, and therefore the base station may determine whether to configure SPS for the service. However, an SPS application scenario in the NB-IoT system is not for the voice service. Therefore, in some cases, the base station may not determine whether SPS needs to be configured for a service. 
     b. After SPS in the LTE system is activated, the base station does not need to send a PDCCH for each time of periodic data transmission to perform scheduling, so that the PDCCH is saved from a perspective of a network. However, from a perspective of the terminal device, because the base station may further use the PDCCH to reactivate or suspend scheduling SPS, the terminal device still needs to continuously listen on the PDCCH. Therefore, power consumption of the terminal device is not reduced. 
     c. During use of SPS, coverage enhancement is not considered in the LTE system. Therefore, a coverage level problem is not considered in an SPS configuration or the like. 
     d. SPS in the LTE system is mainly used for a voice service, and therefore is used when the terminal device is in a connected mode. However, in the NB-IoT system, the connected mode is mainly applied to a small data packet transmission scenario, and transmission of a large data amount is mainly performed in an idle mode SC-PTM (for example, a software upgrade). However, SPS in the LTE system does not support use in an idle mode. 
     In view of this, the technical solutions in the embodiments of this application are provided, so that the foregoing problems can be resolved. The embodiments of this application may be applied to the NB-IoT system, or may be applied to another similar communications system. 
     The technical background of the embodiments of this application is described above. For the following descriptions, refer to  FIG.  2   .  FIG.  2    is a schematic diagram of an application scenario according to an embodiment of this application. 
       FIG.  2    includes a network device and a plurality of terminal devices. These terminal devices are terminal devices in an NB-IoT system, for example, include a refrigerator, a vehicle, and a television. For example, the network device is a base station. The base station may schedule these terminal devices in an SPS scheduling manner. 
     With reference to the accompanying drawings, the following describes the technical solutions provided in the embodiments of this application. An example in which the technical solutions provided in the embodiments of this application are applied to the application scenario shown in  FIG.  2    is used in the following description process. In actual application, this is certainly not limited thereto. 
     Referring to  FIG.  3   , an embodiment of this application provides a resource configuration method. A procedure of the method is described below. 
     S 31 . A network device sends a broadcast message. The broadcast message is used to indicate that the network device supports semi-persistent scheduling; or the broadcast message is used to indicate a random access resource reserved by the network device for a terminal device to apply for semi-persistent scheduling. 
     For example, the broadcast message is a system message, or may be another message. If the network device supports semi-persistent scheduling, the broadcast message may be used to notify the terminal device in any one of the following manners: 
     Manner 1: Explicit Indication Manner 
     In this manner, the broadcast message may directly indicate that the network device supports semi-persistent scheduling. For example, the broadcast message may carry semi-persistent scheduling indication information, and the semi-persistent scheduling indication information occupies, for example, 1 bit or a plurality of bits. For example, the semi-persistent scheduling indication information occupies 1 bit. If a value of the bit is “0”, it indicates that the network device does not support semi-persistent scheduling; or if a value of the bit is “1”, it indicates that the network device supports semi-persistent scheduling. Alternatively, if the network device supports semi-persistent scheduling, the semi-persistent scheduling indication information is carried in the broadcast message; or if the network device does not support semi-persistent scheduling, the semi-persistent scheduling indication information is not carried in the broadcast message. Alternatively, the broadcast message is a dedicated message used to indicate whether the network device supports semi-persistent scheduling. In this case, if the network device sends the broadcast message, it indicates that the network device supports semi-persistent scheduling. If the network device does not send the broadcast message, it indicates that the network device does not support semi-persistent scheduling. 
     In addition, in this manner, the broadcast message may further indicate a coverage level that is of semi-persistent scheduling and that is supported by the network device, so that the terminal device can determine, based on the coverage level that is of semi-persistent scheduling and that is supported by the network device and a coverage level of the terminal device, whether to apply for semi-persistent scheduling. If the coverage level of the terminal device is included in the coverage level that is of semi-persistent scheduling and that is supported by the network device, in other words, the coverage level that is of semi-persistent scheduling and that is supported by the network device includes the coverage level of the terminal device, the terminal device determines that semi-persistent scheduling can be applied for. If the coverage level that is of semi-persistent scheduling and that is supported by the network device does not include the coverage level of the terminal device, the terminal device cannot apply for semi-persistent scheduling. For example, the coverage levels of semi-persistent scheduling that are supported by the network device are a coverage level  1  and a coverage level  2 . If the coverage level of the terminal device is the coverage level  1  or the coverage level  2 , the terminal device can apply for semi-persistent scheduling. If the coverage level of the terminal device is a coverage level  3 , the terminal device cannot apply for semi-persistent scheduling because the network device cannot support to use the coverage level  3  for semi-persistent scheduling. 
     The network device may support one or more coverage levels. For example, different coverage levels may be represented by using different identifiers. In this case, a coverage level corresponding to an identifier included in the broadcast message is a coverage level supported by the network device. 
     Manner 2: Implicit Indication Manner 
     In this manner, the broadcast message may indicate the random access resource reserved for the terminal device to apply for semi-persistent scheduling. To be specific, if the network device indicates the random access resource reserved for the terminal device to apply for semi-persistent scheduling, it certainly indicates that the network device supports semi-persistent scheduling. In this case, if the terminal device performs random access by using the random access resource indicated by the network device, it indicates that the terminal device applies for semi-persistent scheduling. The reserved random access resource may include at least one of a reserved time domain resource, a reserved frequency domain resource, and a reserved code domain resource. The reserved frequency domain resource may include at least one of a reserved subcarrier and a reserved carrier, and the reserved code domain resource includes a reserved preamble. 
     In this manner, the broadcast message may also indicate a coverage level that is of semi-persistent scheduling and that corresponds to the reserved random access resource, so that the terminal device can determine, based on the coverage level that is of semi-persistent scheduling and that corresponds to the reserved random access resource and a coverage level of the terminal device, whether to apply for semi-persistent scheduling. The reserved random access resource may correspond to one or more coverage levels, to be specific, in the reserved random access resources, different random access resources may correspond to a same coverage level, or different random access resources may correspond to different coverage levels. In this case, the terminal device selects a corresponding random access resource from the reserved random access resources based on the coverage level of the terminal device. For example, the reserved random access resources include a random access resource  1  and a random access resource  2 , a coverage level corresponding to the random access resource  1  is a coverage level  1 , a coverage level corresponding to the random access resource  2  is a coverage level  2 , and the coverage level of the terminal device is the coverage level  2 . In this case, the terminal device may select the random access resource  2  from the reserved random access resources to apply for semi-persistent scheduling 
     Step S 31  is not mandatory. To distinguish between step S 31  and a mandatory step, an arrow representing step S 31  is drawn in a dashed line in  FIG.  3   . 
     S 32 . If the terminal device applies to the network device for semi-persistent scheduling, the network device determines that the terminal device applies for semi-persistent scheduling. 
     The terminal device may apply to the network device for semi-persistent scheduling in a scenario in which the terminal device needs to transmit a large amount of data, a scenario in which the terminal device needs to periodically transmit data, a scenario in which the terminal device needs to deal with some burst uplink data, or the like. 
     In this embodiment of this application, the terminal device may apply to the network device for semi-persistent scheduling in different manners. An application manner of the terminal device is related to a manner in which the network device sends the broadcast message in step S 31 . 
     Application Manner A: Explicit Application Manner 
     When the broadcast message is used to indicate that the network device supports semi-persistent scheduling, to be specific, when the network device performs indication in step S 31  in the manner 1, the terminal device may send semi-persistent scheduling request information to the network device by using first RRC signaling. The semi-persistent scheduling request information is used to apply for semi-persistent scheduling. 
     For example, the first RRC signaling is an RRC connection setup request message (for example, an Msg3 in a random access process). Certainly, an implementation of the first RRC signaling is not limited in this embodiment of this application. 
     In this manner, the broadcast message further supports a coverage level that is of semi-persistent scheduling and that is supported by the network device. In this case, if the network device supports only one coverage level, semi-persistent scheduling only needs to be directly applied for by using the first RRC signaling. However, if the network device supports a plurality of coverage levels, the terminal device may add a coverage level of the terminal device to the first RRC signaling, or add, to the first RRC signaling, a coverage level of semi-persistent scheduling for which the terminal device applies. Therefore, the network device can determine a coverage level for which the terminal device applies. Alternatively, the network device may obtain a coverage level of the terminal device in advance. For example, the network device may determine the coverage level of the terminal device by using a random access resource used by the terminal device to initiate random access. To be specific, different random access resources may correspond to different coverage levels. If the terminal device initiates random access to the network device by using a corresponding random access resource, it indicates that the coverage level of the terminal device is a coverage level corresponding to the random access resource. In this case, even if the network device supports the plurality of coverage levels, semi-persistent scheduling also only needs to be directly applied for by using the first RRC signaling. After receiving the first RRC signaling, the network device may determine, based on the coverage level of the terminal device, the coverage level for which the terminal device applies. 
     Application Manner B: Implicit Application Manner 
     When the broadcast message is used to indicate the random access resource reserved by the network device for the terminal device to apply for semi-persistent scheduling, to be specific, when the network device performs indication in step S 31  in the manner 2, the terminal device directly sends a random access preamble to the network device by using a first random access resource in the reserved random access resource. In this manner, the first random access resource in the reserved random access resource is actually used to apply for semi-persistent scheduling. The network device can determine that the terminal device applies for semi-persistent scheduling, provided that the network device receives, by using the reserved random access resource, the random access preamble sent by the terminal device. 
     If the broadcast message further indicates a coverage level corresponding to the reserved random access resource, for example, the reserved random access resources include a random access resource  1  and a random access resource  2 , a coverage level corresponding to the random access resource  1  is a coverage level  1 , a coverage level corresponding to the random access resource  2  is a coverage level  2 , and a coverage level of the terminal device is the coverage level  2 , the terminal device may choose to send the random access preamble to the network device by using the random access resource  2 . After receiving the random access preamble by using the random access resource  2 , the network device may determine that the terminal device applies for semi-persistent scheduling, and a coverage level of semi-persistent scheduling for which the terminal device applies is the coverage level  2 . 
     S 33 . If the network device sends configuration information to the terminal device, the terminal device receives the configuration information sent by the network device. The configuration information is used to configure a semi-persistent scheduling resource for the terminal device. The semi-persistent scheduling resource is referred to as a first semi-persistent scheduling resource below. 
     After the network device receives the first information sent by the terminal device, if the network device determines that the terminal device applies for semi-persistent scheduling, the network device configures the first semi-persistent scheduling resource for the terminal device. In other words, the network device generates the configuration information used to configure the first semi-persistent scheduling resource for the terminal device. For example, the network device may send the configuration information to the terminal device by using second RRC signaling. In other words, the second RRC signaling carries the configuration information. 
     In this embodiment of this application, the configuration information is used to indicate at least one of a scheduling period of the first semi-persistent scheduling resource, a quantity of repeated transmission times, an MCS used on the first semi-persistent scheduling resource, and a TBS used on the first semi-persistent scheduling resource. Certainly, the configuration information may further indicate other information used to configure the first semi-persistent scheduling resource. That the configuration information is used to indicate one piece of information may be understood as follows: The configuration information includes the information, or the configuration information includes information used to indicate the information. For example, that the configuration information is used to indicate the quantity of repeated transmission times may be understood as follows: The configuration information includes the quantity of repeated transmission times, or the configuration information includes information used to indicate the quantity of repeated transmission times. The quantity of repeated transmission times can be determined by using the information used to indicate the quantity of repeated transmission times. 
     The quantity of repeated transmission times is used to indicate a quantity of times of repeated transmission on the first semi-persistent scheduling resource. After a coverage level is determined, the network device may configure, based on a case, a quantity of repeated transmission times that corresponds to the coverage level. When a same coverage level is applied to different terminal devices, the network device probably configures different quantities of repeated transmission times. For example, if both a terminal device  1  and a terminal device  2  apply for semi-persistent scheduling, and both coverage levels of semi-persistent scheduling that is applied for are a coverage level  1 , based on a factor such as coverage statuses or application scenarios of different terminal devices, the network device may configure one repeated transmission time for the coverage level  1  of the terminal device  1 , and configure two repeated transmission times for the coverage level  1  of the terminal device  2 . 
     If the terminal device needs to use the first semi-persistent scheduling resource, in addition to configuring the first semi-persistent scheduling resource for the terminal device, the network device needs to activate the first semi-persistent scheduling resource. In this embodiment of this application, the configuration information may be used to configure the first semi-persistent scheduling resource. In this case, after the first semi-persistent scheduling resource is configured, the first semi-persistent scheduling resource may be further activated. For example, the network device further activates the first semi-persistent scheduling resource by using a PDCCH scrambled by using an SPS-RNTI. The PDCCH further carries DCI. Only after the terminal device receives the PDCCH scrambled by using the SPS-RNTI, or it is understood that the terminal device receives the DCI carried on the PDCCH scrambled by using the SPS-RNTI, the terminal device determines that the first semi-persistent scheduling resource is activated, and further performs data receiving and sending by using the first semi-persistent scheduling resource. 
     Alternatively, this embodiment of this application provides a simpler activation manner. To be specific, in addition to being used to configure the first semi-persistent scheduling resource, the configuration information may be used to activate the first semi-persistent scheduling resource. In this case, after receiving the configuration information, the terminal device may consider that the first semi-persistent scheduling resource is activated, and can be directly used. A start location of a 1 st  available first semi-persistent scheduling resource may be a start location that is of a 1 st  first semi-persistent scheduling resource and that is obtained after the terminal device feeds back an acknowledgment (ACK)/a negative acknowledgment (HACK) for RRC connection setup scheduled by the network device. To be specific, if the network device schedules the RRC connection setup, the terminal device feeds back the ACK/NACK to the network device. If the first semi-persistent scheduling resource is a periodic resource, the start location that is the 1 st  first semi-persistent scheduling resource and that is obtained after the terminal device feeds back the ACK/NACK is the start location of the 1 st  available first available semi-persistent scheduling resource, After the location of the 1 st  first available semi-persistent scheduling resource is determined, a subsequent location of the first semi-persistent scheduling resource can be determined based on a period of the first semi-persistent scheduling resource. In this manner, a step required for activating the semi-persistent scheduling resource is reduced, and an activation process is accelerated. In addition, because the PDCCH does not need to be used for activation, transmission resources can also be saved and power consumption of listening, by the terminal device, on the PDCCH used for activation can also be reduced. 
     S 34 . The terminal device configures the first semi-persistent scheduling resource for the terminal device based on the configuration information. 
     After receiving the configuration information, the terminal device configures the first semi-persistent resource for the terminal device based on the configuration information, so that the terminal device can subsequently use the first semi-persistent resource. 
     S 35 . If the terminal device sends uplink data to the network device on the first semi-persistent scheduling resource, the network device receives, on the first semi-persistent scheduling resource, the uplink data sent by the terminal device. 
     After the first semi-persistent scheduling resource is activated, the terminal device can use the first semi-persistent scheduling resource. In this case, the terminal device sends the uplink data to the network device by using the first semi-persistent scheduling resource, and the network device does not need to perform resource scheduling for each piece of uplink data, so that network resources are saved. 
     In this embodiment of this application, in addition to configuring and activating the first semi-persistent scheduling resource for the terminal device, the network device may stop scheduling the first semi-persistent scheduling resource. For example, after step S 33 , or if the configuration information is not used to activate the first semi-persistent scheduling resource, but another step further needs to be performed to activate the first semi-persistent scheduling resource, after the first semi-persistent scheduling resource is activated or after step S 34 , the network device may determine to stop scheduling the first semi-persistent scheduling resource, and the terminal device cannot use the first semi-persistent scheduling resource any more. In this case, the network device needs to notify the terminal device. For example, the network device sends first indication information to the terminal device by using media access control (MAC) signaling, and the first indication information is used to indicate that scheduling of the first semi-persistent scheduling resource is stopped. In this case, after receiving the MAC signaling and obtaining the first indication information from the MAC signaling, the terminal device may determine that the network device has stopped scheduling the first semi-persistent scheduling resource, and the terminal device stops using the first semi-persistent scheduling resource. For example, the MAC signaling is a MAC control element (CE). Stopping scheduling the first semi-persistent scheduling resource may be considered as follows: Configuration information of the first semi-persistent scheduling resource still exists, in other words, the first semi-persistent scheduling resource is not released. The network device may further re-enable the first semi-persistent scheduling resource subsequently. 
     As described above, in the LTE system, the base station may use, at any time, the PDCCH scrambled by using the SPS-RNTI to stop the SPS scheduling manner. In this case, to monitor whether the base station sends the PDCCH scrambled by using the SPS-RNTI to stop the SPS scheduling manner, the terminal device needs to always listen on the PDCCH, and therefore power consumption of the terminal device is relatively high. However, in this embodiment of this application, the network device may use the MAC signaling to indicate that scheduling of the first semi-persistent scheduling resource is stopped, and the terminal device does not need to always listen on the PDCCH. This helps reduce power consumption of the terminal device. 
     In this embodiment of this application, the network device may alternatively reconfigure a new semi-persistent scheduling resource for the terminal device, or may release the first semi-persistent scheduling resource. For example, after step S 33 , or if the configuration information is not used to activate the first semi-persistent scheduling resource, but another step further needs to be performed to activate the first semi-persistent scheduling resource, after the first semi-persistent scheduling resource is activated or after step S 34 , the network device sends second indication information to the terminal device by using second RRC signaling. The second indication information is used to configure a second semi-persistent scheduling resource for the terminal device or is used to release the first semi-persistent scheduling resource. In this case, after receiving the second indication information, the terminal device may determine that the network device reconfigures the second semi-persistent scheduling resource for the terminal device, and the terminal device may stop using the first semi-persistent scheduling resource, and start to use the second semi-persistent scheduling resource. Alternatively, after receiving the second indication information, the terminal device may determine that the network device has released the first semi-persistent scheduling resource, and the terminal device no longer uses the first semi-persistent scheduling resource. Releasing the first semi-persistent scheduling resource means that the first semi-persistent scheduling resource is released. The network device cannot subsequently re-enable the first semi-persistent scheduling resource. The second semi-persistent scheduling resource may be a semi-persistent scheduling resource newly configured by the network device, or may be a semi-persistent scheduling resource whose scheduling is previously stopped. 
     As described above, in the LTE system, the base station may use, at any time, the PDCCH scrambled by using the SPS-RNTI to change the scheduling information used for SPS, that is, reactivate SPS. In this case, to monitor whether the base station sends the PDCCH scrambled by using the SPS-RNTI to reactivate SPS, the terminal device needs to always listen on the PDCCH, and therefore power consumption of the terminal device is relatively high. However, in this embodiment of this application, the network device may use the second RRC signaling to indicate the second semi-persistent scheduling resource, and the terminal device does not need to always listen on the PDCCH. This helps reduce power consumption of the terminal device. 
     In conclusion, in this embodiment of this application, the terminal device applies to the network device for semi-persistent scheduling. Therefore, after receiving the application from the terminal device, the network device may configure semi-persistent scheduling for the terminal device, and the network device does not need to determine whether semi-persistent scheduling needs to be configured for the terminal device, so that a configuration result better meets a requirement of the terminal device. This can also reduce a resource waste caused h a dynamic scheduling manner used because the network device cannot determine whether semi-persistent scheduling needs to be configured. 
     The foregoing describes a manner of implementing semi-persistent scheduling in the NB-IoT system. The following further describes, in another embodiment, another manner of implementing semi-persistent scheduling in the NB-IoT system. In both manners, semi-persistent scheduling can be implemented in the NB-IoT system. 
     An embodiment of this application provides a method for configuring DCI. An example in which the method is applied to the application scenario shown in  FIG.  2    is used in the following description process. 
     In the method, a network device sends DCI format information. The DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks. In this case, a terminal device may receive the DCI format information sent by the network device. Then, if the network device sends the DCI, the terminal device receives the DCI sent by the network device. 
     The DCI indicated by the DCI format information can be used to schedule the at least two transport blocks, so that semi-persistent scheduling is implemented after the DCI is used. System overheads for sending DCI to each transport block in a network are reduced, and power consumption of listening to a plurality of pieces of DCI by the terminal device is also reduced. 
     The following describes this embodiment by using two scenarios: a scenario in which the terminal device is in an idle mode and a scenario in which the terminal device is in a connected mode. 
     1. The scenario in which the terminal device is in the idle mode. 
       FIG.  4    shows an implementation procedure of a method for configuring DCI in the scenario in which the terminal device is in the idle mode. 
     S 41 . A core network device sends a notification message to a network device. The notification message is used to indicate DCI format information supported by a service performed by the network device, and/or the notification message is used to indicate capability information of the terminal device. 
     For example, the capability information of the terminal device may be used to determine whether the terminal device supports the DCI format. 
     Because in the idle mode, the network device usually performs a multicast service, the capability information that is of the terminal device and that is indicated by the notification message herein is capability information of all or some terminal devices that can participate in the multicast service. 
     In this scenario, the step in which the network device sends the DCI format information may include two substeps: the following steps S 42  and S 43 . 
     S 42 . If the network device broadcasts second DCI format information used on a single cell multimedia broadcast multicast service control channel (SC-MCCH), the terminal device may receive the second DCI format information broadcast by the network device. 
     When the capability information of the terminal device indicates that the terminal device supports the DCI format, or when the service performed by the network device supports the DCI format, the network device broadcasts the second DCI format information. The second DCI format information may be generated by the network device. 
     In an example, the network device may use a system broadcast to indicate that a DCI format used on the SC-MCCH is the second DCI format. For example, the system broadcast is a system information block (SIB)  20 . Certainly, a manner in which the network device broadcasts the second DCI format information is not limited in this embodiment of this application. 
     Step S 42  is optional. To be specific, because the SC-MCCH needs to support all terminal devices in a cell, and some of the terminal devices may not support a new DCI format, or services performed by some terminal devices may not need to use a new DCI format, new DCI format information may not need to be configured for the SC-MCCH. 
     S 43 . If the network device sends, through the SC-MCH, first DCI format information used on a single cell multimedia broadcast multicast service traffic channel (SC-MTCH), the terminal device may receive the first DCI format information sent by the network device through the SC-MCCH. 
     When the capability information of the terminal device indicates that the terminal device supports the DCI format, or when the service performed by the network device supports the DCI format, the network device sends the first DCI format information through the SC-MCCH. The first DCI format information may be generated by the network device. 
     To be specific, the network device uses the SC-MCCH to indicate the first DCI format information used on each SC-MTCH that needs to use a new DCI format. One service corresponds to one SC-MTCH, and therefore there may be a plurality of SC-MTCHs. The first DCI format information used by the plurality of SC-MTCHs may be different or may be the same. In addition, the first DCI format information may be the same as or different from the second DCI format information, first DCI indicated by the first DCI format information can be used to schedule at least two transport blocks, and second DCI indicated by the second DCI format information can also be used to schedule at least two transport blocks. That the first DCI format information is different from the second DCI format information may mean that the first DCI and the second DCI can be used to schedule different quantities of transport blocks. 
     Both the SC-MCCH and the SC-MTCH are logical channels. In the scenario in which the terminal device is in the idle mode, data is transmitted between the network device and the terminal device through the SC-MCCH and the SC-MTCH. Therefore, if step S 42  is performed, the DCI format includes the first DCI format and the second DCI format in this case. If step S 42  is not performed, the DCI format includes the first DCI format in this case. 
     S 44 , If the network device sends the SC-MCCH by using the second DCI format, the terminal device receives the SC-MCCH using the second DCI format. 
     If step S 42  is performed, the network device sends the SC-MCCH by using the second DCI format. In other words, step S 44  is also optional, and step S 44  is performed while ensuring that step S 42  is performed. 
     S 45 . If the network device sends the SC-MTCH by using the first DCI format according to an indication of the SC-MCCH, the terminal device receives the SC-MCH using the first DCI format, to be specific, the terminal device receives, based on the first DCI, downlink data sent by the network device. 
     Step S 44  may be performed before or after step S 45 , or steps S 44  and S 45  may be simultaneously performed. This is not limited in this embodiment of this application. 
     According to the method provided in this embodiment of this application, even if the terminal device is in the idle mode, semi-persistent scheduling can also be implemented to save transmission resources. 
     The foregoing describes the method for configuring DCI when the terminal device is in the idle mode. The following further describes a method for configuring DCI when the terminal device is in the connected mode. 
     2. The scenario in which the terminal device is in the connected mode. 
       FIG.  5    shows an implementation procedure of a method for configuring DCI in the scenario in which the terminal device is in the connected mode. 
     S 51 . A network device obtains capability information of the terminal device. 
     For example, the network device needs to obtain a capability of supporting the DCI format information by the terminal device. 
     In the connected mode, the terminal device usually performs a unicast service. Therefore, a unicast scenario is described in this embodiment. In this case, the network device may obtain the capability information of the terminal device in a plurality of different manners. The several manners are described as follows: 
     a. The terminal device sends the capability information of the terminal device to the network device. 
     b. The network device obtains the capability information of the terminal device in a random access process of the terminal device. 
     For example, in the random access process performed by the terminal device, the terminal device adds the capability information of the terminal device to an Msg3 message. 
     c. The network device receives the capability information of the terminal device that is sent by a core network device. 
     For example, when releasing a connection to the terminal device last time, the network device may forward the capability information of the terminal device to the core network device for storage. In this case, the network device may subsequently obtain the capability information of the terminal device from the core network device. 
     The foregoing several manners in which the network device obtains the capability information of the terminal device are merely examples. The capability information of the terminal device is not limited to being obtained in the foregoing several manners in this embodiment of this application. 
     S 52 . If the network device sends the DCI format information to the terminal device, the terminal device receives the DCI format information sent by the network device. 
     If the network device determines, by using the capability information of the terminal device, that the terminal device can support the DCI format information, in other words, the terminal device can support DCI indicated by the DCI format information, the network device may send the DCI format information to the terminal device. For example, the network device may send the DCI format information to the terminal device by using RRC signaling. The DCI format information may be generated by the network device. 
     S 53 . If the network device sends the DCI to the terminal device, the terminal device receives the DCI. The DCI is the DCI indicated by the DCI format information. 
     S 54 . If the network device sends downlink data to the terminal device based on scheduling of the DCI, the terminal device receives, based on scheduling of the DCI, the downlink data sent by the network device. 
     For example, the network device may perform downlink scheduling by using the DCI, and the DCI may be used to schedule a plurality of transport blocks. In this case, semi-persistent scheduling is implemented. Power consumption of listening on a PDCCH by the terminal device can be reduced by using the DCI. 
     In addition, after the DCI is enabled, use of the DCI may be further suspended or new DCI may be re-enabled. For example, the network device may send first indication information to the terminal device. The first indication information is used to indicate that application of the DCI format is suspended, or used to indicate that a new DCI format is enabled. For example, the first indication information may be implemented by using RRC signaling or a MAC CE, In other words, the first indication information does not need to be carried on a PDCCH. In this case, the terminal device does not need to continuously listen on the PDCCH when the terminal device needs to listen to the first indication information, to further reduce power consumption of the terminal device. 
     The foregoing describes a solution for implementing semi-persistent scheduling. The following further describes another embodiment, and describes how the network device instructs the terminal device to release an RRC connection. 
     In the prior art, after the base station and the terminal device set up an RRC connection, if the RRC connection needs to be released, the network device sends RRC signaling to the terminal device, to instruct the terminal device to release the RRC connection. In this case, after releasing the RRC connection, the terminal device needs to send an RRC status report to the network device by using an uplink resource. However, the network device does not know that the terminal device needs to send the RRC status report to the network device. Therefore, the network device does not schedule the uplink resource for the terminal device. In this case, the terminal device needs to apply for the uplink resource to send the RRC status report. For example, a terminal device in an NB-IoT system may apply for the uplink resource in a random access process, and therefore power consumption is high. In view of this, this application provides an RRC connection release method, to effectively reduce power consumption of the terminal device. 
     Referring to  FIG.  6   , a procedure of the method is described below. An example in which the method is applied to the application scenario shown in  FIG.  2    continues to be used in the following description process. 
     S 61 . If a terminal device sends capability information of the terminal device to a network device, the network device receives the capability information of the terminal device that is sent by the terminal device. 
     The capability information of the terminal device may be used to indicate whether the terminal device supports the network device in using media access control (MAC) signaling to instruct the terminal device to release an RRC connection between the terminal device and the network device. 
     Alternatively, if the network device has obtained the capability information of the terminal device in advance, step S 62  may be directly performed without a need to perform step S 61 . To be specific, the network device may alternatively obtain the capability information of the terminal device in another manner. For a specific obtaining manner, refer to the descriptions in step S 51  in the embodiment shown in  FIG.  5   . Details are not described again. 
     S 62 . If the network device sends first media access control signaling to the terminal device, the terminal device receives the first media access control signaling. The first media access control signaling is used to instruct the terminal device to release the RRC connection between the terminal device and the network device. 
     If the capability information of the terminal device indicates that the terminal device supports the network device in using the MAC signaling to instruct the terminal device to release the RRC connection between the terminal device and the network device, when determining that the RRC connection between the network device and the terminal device needs to be released, the network device sends the first media access control signaling to the terminal device, to instruct the terminal device to release the RRC connection. For example, the first media access control signaling is a MAC CE. 
     S 63 . The terminal device releases the RRC connection based on the first media access control signaling. 
     After receiving the first media access control signaling, the terminal device may release the RRC connection between the terminal device and the network device based on the first media access control signaling. 
     S 64 . If the terminal device sends an acknowledgment (ACK) or a negative acknowledgment (NACK) to the network device, the network device receives the ACK or the NACK sent by the terminal device. 
     The ACK is used to indicate that the RRC connection is successfully released, and the NACK is used to indicate that the RRC connection fails to be released. 
     The terminal device generates an ACK or a NACK based on a result of releasing the RRC connection. If the RRC connection is successfully released, the terminal device generates the ACK, and sends the ACK to the network device; or if the RRC connection fails to be released, the terminal device generates the NACK, and sends the NACK to the network device. 
     It can be learned that the network device uses MAC signaling (namely, the first media access control signaling) to instruct the terminal device to release the RRC connection, instead of using RRC signaling for instruction. Therefore, the terminal device does not need to send an RRC status report to the network device. The ACK/NACK is MAC layer signaling, an uplink resource required by the MAC layer signaling is scheduled by the network device, and the terminal device may directly use the uplink resource without a need to apply for scheduling again. It can be learned that after the technical solution in this embodiment of this application is used, the terminal device does not need to apply to the network device for the uplink resource again, so that power consumption of the terminal device is reduced, and an entire procedure can also be simplified. 
     Devices provided in embodiments of this application are described below with reference to the accompanying drawings. 
       FIG.  7    is a schematic structural diagram of a terminal device  700 . The terminal device  700  may implement functions of the terminal device in the foregoing descriptions. The terminal device  700  may include a transmitter  701 , a receiver  702 , and a processor  703 . The transmitter  701  may be configured to perform steps S 32  and S 35  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The receiver  702  may be configured to perform step S 33  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The processor  703  may be configured to perform step S 34  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. 
     For example, the transmitter  701  is configured to apply to the network device for semi-persistent scheduling. 
     The receiver  702  is configured to: after the transmitter  701  applies to the network device for semi-persistent scheduling, receive configuration information sent by the network device. The configuration information is used to configure a first semi-persistent scheduling resource for the terminal device. 
     The processor  703  is configured to configure the first semi-persistent resource for the terminal device based on the configuration information received by the receiver  702 . 
     The transmitter  701  is further configured to send uplink data to the network device on the first semi-persistent scheduling resource configured by the processor  703 . 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
       FIG.  8    is a schematic structural diagram of a network device  800 . The network device  800  may implement functions of the network device in the foregoing descriptions. The network device  800  may include a transmitter  801 , a receiver  802 , and a processor  803 . The transmitter  801  may be configured to perform steps S 31  and S 33  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The receiver  802  may be configured to perform steps S 32  and S 35  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The processor  803  may be configured to perform step S 32  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. 
     For example, the processor  803  is configured to determine that the terminal device applies for semi-persistent scheduling. 
     The transmitter  801  is configured to: after the processor  803  determines that the terminal device applies for semi-persistent scheduling, send configuration information to the terminal device. The configuration information is used to configure a first semi-persistent scheduling resource for the terminal device. 
     The receiver  802  is configured to receive, on the first semi-persistent scheduling resource configured by using the configuration information sent by the transmitter  801 , uplink data sent by the terminal device. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
       FIG.  9    is a schematic structural diagram of a network device  900 . The network device  900  may implement functions of the network device in the foregoing descriptions. The network device  900  may include a transmitter  901  and a processor  902 . The transmitter  901  may be configured to perform steps S 42  to S 44  in the embodiment shown in  FIG.  4    and steps S 51 , S 53 , and S 54  in the embodiment shown in  FIG.  5   , and/or configured to support another process of the technology described in this specification. The processor  902  may be configured to: generate DCI format information, and obtain capability information of the terminal device and/or DCI format information supported by a service performed by the network device  900 , and/or configured to support another process of the technology described in this specification. 
     For example, the processor  902  is configured to generate the DCI format information. 
     The transmitter  901  is configured to send the DCI format information generated by the processor  902 . The DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks. 
     The transmitter  901  is further configured to send the DCI to the terminal device. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
       FIG.  10    is a schematic structural diagram of a terminal device  1000 . The terminal device  1000  may implement functions of the terminal device in the foregoing descriptions. The terminal device  1000  may include a receiver  1001 . Optionally, the terminal device  1000  may further include a transmitter  1002 . The receiver  1001  may be configured to perform steps S 42  to S 44  in the embodiment shown in  FIG.  4    and steps S 52 , S 53 , and S 54  in the embodiment shown in  FIG.  5   , and/or configured to support another process of the technology described in this specification. The transmitter  1002  may be configured to send capability information of the terminal device to the network device, and/or configured to support another process of the technology described in this specification. 
     For example, the receiver  1001  is configured to receive DCI format information sent by the network device. The DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks. 
     The receiver  1001  is further configured to receive the DCI sent by the network device. 
     The receiver  1001  is further configured to receive, based on scheduling of the DCI, downlink data sent by the network device. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
       FIG.  11    is a schematic structural diagram of a terminal device  1100 . The terminal device  1100  may implement functions of the terminal device in the foregoing descriptions. The terminal device  1100  may include a receiver  1101  and a processor  1102 . Optionally, the terminal device  1100  may further include a transmitter  1103 . The receiver  1101  may be configured to perform step S 62  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. The processor  1102  may be configured to perform step S 63  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. The transmitter  1103  may be configured to perform steps S 61  and S 64  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. 
     For example, the receiver  1101  is configured to receive first media access control signaling sent by the network device. The first media access control signaling is used to instruct the terminal device to release the RRC connection to the network device. 
     The processor  1102  is configured to release the RRC connection based on the first media access control signaling received by the receiver  1101 . 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
       FIG.  12    is a schematic structural diagram of a network device  1200 . The network device  1200  may implement functions of the network device in the foregoing descriptions. The network device  1200  may include a transmitter  1201  and a receiver  1202 . The transmitter  1201  may be configured to perform step S 62  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. The receiver  1202  may be configured to perform steps S 61  and S 64  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. 
     For example, the transmitter  1201  is configured to send first media access control signaling to the terminal device. The first media access control signaling is used to instruct the terminal device to release the RRC connection to the network device. 
     The receiver  1202  is configured to receive an ACK or a NACK sent by the terminal device based on the first media access control signaling sent by the transmitter  1201 . The ACK is used to indicate that the RRC connection is successfully released, and the NACK is used to indicate that the RRC connection fails to be released. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     In the embodiments of this application, the terminal device  700 , the terminal device  1000 , the terminal device  1100 , the network device  800 , the network device  900 , and the network device  1200  are presented in a form in which function modules are obtained through division based on corresponding functions, or may be presented in a form in which function modules are obtained through division in an integrated manner. The “module” herein may be an application-specific integrated circuit (ASIC), a processor and a memory for executing one or more software or firmware programs, an integrated logic circuit, and/or another device that can provide the foregoing functions. 
     In a simple embodiment, a person skilled in the art may figure out that the terminal device  700 , the terminal device  1000 , the terminal device  1100 , the network device  800 , the network device  900 , or the network device  1200  may be further implemented by using a structure of a communications apparatus  1300  shown in  FIG.  13   . 
     As shown in  FIG.  13   , the communications apparatus  1300  may include a memory  1301 , a processor  1302 , and a communications interface  1303 . The memory  1301  and the communications interface  1303  are connected to the processor  1302 . The memory  1301  is configured to store a computer execution instruction. When the communications apparatus  1300  runs, the processor  1302  executes the computer execution instruction stored in the memory  1301 , so that the communications apparatus  1300  performs the method provided in at least one of the embodiments shown in  FIG.  3    to  FIG.  6   . For a specific method, refer to the foregoing descriptions and related descriptions in the accompanying drawings. Details are not described herein again. The communications interface  1303  may be implemented by using a transceiver, or implemented by using an independent receiver and transmitter. 
     In an example, the transmitter  701  and the receiver  702  may correspond to the communications interface  1303  in  FIG.  13   . The processor  703  may be built in or independent of the memory  1301  of the communications apparatus  1300  in a hardware/software form. 
     In an example, the transmitter  801  and the receiver  802  may correspond to the communications interface  1303  in  FIG.  13   . The processor  803  may be built in or independent of the memory  1301  of the communications apparatus  1300  in a hardware/software form. 
     In an example, the transmitter  901  may correspond to the communications interface  1303  in  FIG.  13   . The processor  902  may be built in or independent of the memory  1301  of the communications apparatus  1300  in a hardware/software form. 
     In an example, the receiver  1001  and the transmitter  1002  may correspond to the communications interface  1303  in  FIG.  13   . 
     In an example, the receiver  1101  may correspond to the communications interface  1303  in  FIG.  13   . The processor  1102  may be built in or independent of the memory  1301  of the communications apparatus  1300  in a hardware/software form. 
     In an example, the transmitter  1201  and the receiver  1202  may correspond to the communications interface  1303  in  FIG.  13   . 
     Optionally, the communications apparatus  1300  may be a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system-on-a-chip (system on chip, SoC), a central processing unit (central processor unit, CPU), a network processor (NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller unit, MCU), or may be a programmable controller (programmable logic device, PLD) or another integrated chip. Alternatively, the communications apparatus  1300  may be an independent network element, for example, the terminal device or the network device described above. 
     In addition, the terminal device provided in the embodiment shown in  FIG.  7    may be further implemented in another form, including as illustrated in  FIG.  14   . For example, the terminal device  1400  includes a sending module  1401  and a receiving module  1402 . The sending module  1401  may be configured to perform steps S 32  and S 35  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The receiving module  1402  may be configured to perform step S 33  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. A processing module  1403  may be configured to perform step S 34  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. 
     For example, the sending module  1401  is configured to apply to the network device for semi-persistent scheduling. 
     The receiving module  1402  is configured to: after the sending module  1401  applies to the network device for semi-persistent scheduling, receive configuration information sent by the network device. The configuration information is used to configure a first semi-persistent scheduling resource for the terminal device. 
     The processing module  1403  is configured to configure the first semi-persistent resource for the terminal device based on the configuration information received by the receiving module  1402 . 
     The sending module  1401  is further configured to send uplink data to the network device on the first semi-persistent scheduling resource configured by the processing module  1403 . 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The network device provided in the embodiment shown in  FIG.  8    may be further implemented in another form, including as illustrated in  FIG.  15   . For example, the network device  1500  includes a sending module  1501 , a receiving module  1502 , and a processing module  1503 . The sending module  1501  may be configured to perform steps S 31  and S 33  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The receiving module  1502  may be configured to perform steps S 32  and S 35  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. The processing module  1503  may be configured to perform step S 32  in the embodiment shown in  FIG.  3   , and/or configured to support another process of the technology described in this specification. 
     For example, the processing module  1503  is configured to determine that the terminal device applies for semi-persistent scheduling. 
     The sending module  1501  is configured to: after the processing module  1503  determines that the terminal device applies for semi-persistent scheduling, send configuration information to the terminal device. The configuration information is used to configure a first semi-persistent scheduling resource for the terminal device. 
     The receiving module  1502  is configured to receive, on the first semi-persistent scheduling resource configured by using the configuration information sent by the sending module  1501 , uplink data sent by the terminal device. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The network device provided in the embodiment shown in  FIG.  9    may be further implemented in another form, including as illustrated in  FIG.  16   . For example, the network device  1600  includes a sending module  1601  and a processing module  1602 . The sending module  1601  may be configured to perform steps S 42  to S 44  in the embodiment shown in  FIG.  4    and steps S 51 , S 53 , and S 54  in the embodiment shown in  FIG.  5   , and/or configured to support another process of the technology described in this specification. The processing module  1602  may be configured to: generate DCI format information, and obtain capability information of the terminal device and/or DCI format information supported by a service performed by the network device  1600 , and/or configured to support another process of the technology described in this specification. 
     For example, the processing module  1602  is configured to generate the DCI format in formation. 
     The sending module  1601  is configured to send the DCI format information generated by the processing module  1602 . The DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks. 
     The sending module  1601  is configured to send the DCI to the terminal device. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The terminal device provided in the embodiment shown in  FIG.  10    may be further implemented in another form, including as illustrated in  FIG.  17   . For example, the terminal device  1700  includes a receiving module  1701 . Optionally, the terminal device  1700  may further include a sending module  1702 . The receiving module  1701  may be configured to perform steps S 42  to S 44  in the embodiment shown in  FIG.  4    and steps S 52 , S 53 , and S 54  in the embodiment shown in  FIG.  5   , and/or configured to support another process of the technology described in this specification. The sending module  1702  may be configured to send capability information of the terminal device to the network device, and/or configured to support another process of the technology described in this specification. 
     For example, the receiving module  1701  is configured to receive DCI format information sent by the network device. The DCI format information is used to indicate a DCI format used by the network device, and the DCI is used to schedule at least two transport blocks. 
     The receiving module  1701  is further configured to receive the DCI sent by the network device. 
     The receiving module  1701  is further configured to receive, based on scheduling of the DCI, downlink data sent by the network device. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The terminal device provided in the embodiment shown in  FIG.  11    may be further implemented in another form, including as illustrated in  FIG.  18   . For example, the terminal device  1800  includes a receiving module  1801  and a processing module  1802 . Optionally, the terminal device  1800  may further include a sending module  1803 . The receiving module  1801  may be configured to perform step S 62  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. The processing module  1802  may be configured to perform step S 63  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. The sending module  1803  may be configured to perform steps S 61  and S 64  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. 
     For example, the receiving module  1801  is configured to receive first media access control signaling sent by the network device. The first media access control signaling is used to instruct the terminal device to release the RRC connection to the network device. 
     The processing module  1802  is configured to release the RRC connection based on the first media access control signaling received by the receiving module  1801 . 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The network device provided in the embodiment shown in  FIG.  12    may be further implemented in another form, including as illustrated in  FIG.  19   . For example, the network device  1900  includes a sending module  1901  and a receiving module  1902 . The sending module  1901  may be configured to perform step S 62  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. The receiving module  1902  may be configured to perform steps S 61  and S 64  in the embodiment shown in  FIG.  6   , and/or configured to support another process of the technology described in this specification. 
     For example, the sending module  1901  is configured to send first media access control signaling to the terminal device. The first media access control signaling is used to instruct the terminal device to release the RRC connection to the network device. 
     The receiving module  1902  is configured to receive an ACK or a NACK sent by the terminal device based on the first media access control signaling sent by the sending module  1901 . The ACK is used to indicate that the RRC connection is successfully released, and the NACK is used to indicate that the RRC connection fails to be released. 
     All related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The terminal device  700 , the network device  800 , the communications apparatus  1300 , the terminal device  1400 , and the network device  1500  that are provided in the embodiments of this application may be configured to perform the method provided in the embodiment shown in  FIG.  3   , the terminal device  1000 , the network device  900 , the communications apparatus  1300 , the terminal device  1700 , and the network device  1600  may be configured to perform the method provided in at least one of the embodiments shown in  FIG.  4    and  FIG.  5   , and the terminal device  1100 , the network device  1200 , the communications apparatus  1300 , the terminal device  1800 , and the network device  1900  may be configured to perform the method provided in the embodiment shown in  FIG.  6   . Therefore, for technical effects that can be achieved by the devices, refer to the foregoing method embodiments. Details are not described herein again. 
     A person skilled in the art may further understand that various illustrative logical blocks (illustrative logic block) and steps (step) that are listed in the embodiments of this application may be implemented by using electronic hardware computer software, or a combination thereof. Whether the functions are implemented by using hardware or software depends on particular applications and a design requirement of an entire system. A person skilled in the art may use various methods to implement the described functions for each particular application, but it should not be considered that the implementation goes beyond the protection scope of the embodiments of this application. 
     The various illustrative logical units and circuits described in the embodiments of this application may implement or operate the described functions by using a general purpose processor, a digital signal processor, an ASIC, an FPGA or another programmable logical apparatus, a discrete gate or transistor logic, a discrete hardware component, or a design any combination thereof. The general purpose processor may be a microprocessor. Optionally, the general purpose processor may alternatively be any conventional processor, controller, microcontroller, or state machine. The processor may alternatively be implemented by a combination of computing apparatuses, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors with a digital signal processor core, or any other similar configuration. 
     Steps of the methods or algorithms described in the embodiments of this application may be directly embedded into hardware, a software unit executed by a processor, or a combination thereof. The software unit may be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable magnetic disk, a CD-ROM, or a storage medium of any other form in the art. For example, the storage medium may connect to a processor, so that the processor can read information from the storage medium and write information to the storage medium. Optionally, the storage medium may alternatively be integrated into the processor. The processor and the storage medium may be disposed in an ASIC, and the ASIC may be disposed in UE. Optionally, the processor and the storage medium may alternatively be disposed in different components of the UE. 
     It should be understood that sequence numbers of the processes do not mean execution sequences in various embodiments of this application. The execution sequences of the processes should be determined based on functions and internal logic of the processes, and should not be construed as any limitation on the implementation processes of the embodiments of this application. 
     All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the embodiments may be implemented completely or partially in a form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedure or functions according to the embodiments of this application are completely or partially generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or another programmable apparatus. The computer instructions may be stored in a computer readable storage medium, or may be transmitted from a computer readable storage medium to another computer readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or wireless (for example, infrared, radio, or microwave) manner. The computer readable storage medium may be any usable medium accessible by a computer, or a data storage device, such as a server or a data center, integrating one or more usable media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid state disk solid state disk (SSD)), or the like. 
     The parts in this specification are all described in a progressive manner. For same or similar parts in the embodiments, mutual reference may be made to each other. Each embodiment focuses on a difference from another embodiment. Especially, apparatus and system embodiments are basically similar to the method embodiments, and therefore are described briefly. For related parts, refer to partial descriptions in the method embodiments. 
     According to the foregoing description of this specification in this application, technologies in the art may use or implement the content of this application. Any modification based on the disclosed content shall be considered obvious in the art. The basic principles described in this application may be applied to other variations without departing from the essence and scope of this application. Therefore, the content disclosed in this application is not limited to the described embodiments and designs, hut may also be extended to a maximum scope that is consistent with the principles and disclosed new features of this application.