CN115175128A

CN115175128A - Communication method, device and storage medium

Info

Publication number: CN115175128A
Application number: CN202210599045.XA
Authority: CN
Inventors: 刘南南; 张向东; 常俊仁; 肖潇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2022-10-11
Also published as: CN112312347A; WO2021013254A1; CN112312347B

Abstract

The application provides a communication method, a communication device and a storage medium, wherein the method comprises the steps that a first communication device sends a first message to a second communication device, the first communication device receives first system information from the second communication device, the first message comprises first information, and the first information is used for indicating that the first communication device requests the first system information. When the terminal device needs the first system information, the first message can be sent to the network device to request the network device to send the first system information, so that the first communication device can acquire the first system information.

Description

Communication method, device and storage medium

The application is a divisional application, the application number of the original application is 201910678645.3, the date of the original application is 2019, 07, 25, and the entire content of the original application is incorporated by reference in the application.

Technical Field

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

Background

In a wireless communication system, when a terminal device needs certain system information and does not currently store a valid version of the system information, the terminal device needs to acquire the system information from a network device.

In an LTE network, a network device periodically broadcasts a system message (SI message) to a terminal device, that is, the terminal device may receive the system message (SI message) broadcast from the network device. However, after a new communication system (such as NR) appears, there is no corresponding method for how the terminal device acquires the system information.

Disclosure of Invention

The application provides a communication method, a communication device and a storage medium, which are used for acquiring required system information.

In a first aspect, the present application provides a communication method including a first communication device sending a first message to a second communication device, the first communication device receiving first system information from the second communication device, the first message including first information indicating that the first communication device requests the first system information.

Based on the scheme, when the terminal device needs the first system information, the first message can be sent to the network device to obtain the first system information.

In one possible implementation, the first information includes any one or any multiple of information indicating the first communication system, information indicating the first service, information indicating the first system information block SIB, and information indicating the first SI message. For example, when the first information includes information indicating the first communication system, the second communication device may send system information corresponding to the first communication system to the first communication device according to the information indicating the first communication system. When the first information includes information indicating the first service, the second communication device may send system information corresponding to the first service to the first communication device according to the information indicating the first service. When the first information includes information indicating the first system information block SIB, the second communication apparatus may send, to the first communication apparatus, system information corresponding to the first system information block SIB according to the information indicating the first system information block SIB. When the first information includes information indicating the first SI message, the second communication apparatus may thus send system information corresponding to the first SI message to the first communication apparatus according to the information indicating the first SI message.

In one possible implementation, the first communications device determines that a first condition is satisfied, the first condition comprising any one or any plurality of: the first communication device is currently in a connected state; the common search space is not configured on a bandwidth part (BWP) where the first communication device operates or is configured on the BWP where the first communication device operates; the first communication device has the capability of performing a first service; the first communication device configures the first communication device to perform a first service or the first communication device receives first indication information of a second communication device, wherein the first indication information is used for indicating the first communication device to perform the first service; the first communication device does not store a valid version of the first system information; the first communication device receives second indication information of the second communication device, wherein the second indication information is used for indicating that the second communication device has the capability of sending the first system information; the first communication device is in an idle state (idle) or an inactive state (inactive); the first communication device receives or does not receive configuration information sent by the second communication device, wherein the configuration information is used for indicating sending resources of the first message; the first communication device receives the resource allocation of the request system information sent by the second communication device, and/or the first communication device receives the mapping relation between the resource allocation of the request system information sent by the second communication device and the system information; the first communication device does not receive the resource configuration of the request system information sent by the second communication device, and/or the first communication device does not receive the mapping relationship between the resource configuration of the request system information sent by the second communication device and the system information.

The present application exemplarily provides the following four ways for the terminal device to send the first message to the network device.

In a first mode, the first communication device sends the first message to the second communication device through a random access process.

Based on the first mode, in a possible implementation manner, the first message is MSG1, the first information is a first preamble and/or resource information for transmitting MSG1, and the resource information for transmitting MSG1 and/or the first preamble corresponds to at least one system information of the first communication system. Further, the first communication apparatus may receive a mapping relationship between the first preamble transmitted from the second communication apparatus and/or the resource information of the transmission MSG1 and the at least one system information of the first communication system.

Based on the first mode, in another possible implementation manner, the first message is MSG3, and the first information is a first field in MSG3.

In the second mode, the first communication device sends the first message to the second communication device through Medium Access Control (MAC) signaling. The MAC signaling includes a media access control protocol data unit (MAC PDU), where the MAC PDU includes one or more MAC sub-PDUs, the MAC sub-PDUs include a MAC sub-header and a MAC Control Element (CE), the first information is carried in the MAC CE, and the MAC sub-header includes identification information used for indicating the first information carried by the MAC CE.

In a third aspect, the first communications device may send the first message to the second communications device via Radio Resource Control (RRC) signaling.

When aiming at the scenario of V2X service, the RRC signaling may include Sidelink UE Information (SUI).

In a fourth aspect, the first communications device may send the first message according to configuration information, where the configuration information is used to indicate a sending resource of the first message, and the sending resource corresponds to the first system information. Further, the configuration information may be configured by the second communication device, and the first communication device may receive the configuration information from the second communication device.

When the first communication device needs system information, the first communication device may request the system information based on the four ways, and may successfully acquire the system information of the first communication system or the system information of the first service.

In this application, when the first communication device is in a connected state and operates in a BWP not configured with a common search space, the first communication device switches to operate on the BWP configured with the common search space, and thus the first communication device may receive the first system information broadcast by the second communication device.

When the first communication device enters an idle state or an inactive state, or switches to a BWP with a common search space, the first communication device retrieves the first system information.

In this application, a first communication device may receive RRC signaling sent by a second communication device, where the RRC signaling includes first system information. Alternatively, the first communication device may also receive the first system information broadcast by the second communication device.

When the first system information includes the first SIB and the second communication device transmits the first system information to the first communication device in the RRC signaling manner, after the first communication device acquires the first SIB in the RRC signaling receiving manner, the first communication device may perform any one or more of the following manners a to G.

In the method a, the first communication device stops the first timer corresponding to the first SIB acquired by receiving the broadcast.

In mode B, the first communications device determines that the first timer corresponding to the first SIB acquired by receiving the broadcast is invalid for the first SIB acquired by receiving the RRC signaling.

In mode C, after acquiring the first SIB by receiving the RRC signaling, the first communication device deletes all the first SIBs except the first SIB acquired by receiving the RRC signaling.

In the method D, the first communication device acquires the first SIB by receiving RRC signaling, and deletes all versions of the first SIB acquired by receiving broadcast.

In the mode E, after the first SIB is acquired by the first communication device in a manner of receiving the RRC signaling, the first timer corresponding to the first SIB acquired in a manner of receiving the RRC signaling is started or restarted.

In mode F, the first communication device starts or restarts the first timer corresponding to the first SIB obtained by receiving the RRC signaling when the first SIB obtained by receiving the RRC signaling is successfully determined to be valid.

In the method G, the first communication device starts or restarts the first timer corresponding to the first SIB when the first SIB is successfully confirmed to be valid.

In a second aspect, the present application provides a communication method including a first communication apparatus transmitting a second message to a second communication apparatus, the first communication apparatus receiving system information from the second communication apparatus, wherein the second message includes second information for notifying the second communication apparatus that the first communication apparatus requires the system information, or for notifying the second communication apparatus that the first communication apparatus cannot acquire the system information, or for notifying the second communication apparatus that the first communication apparatus requires switching of a partial bandwidth BWP.

Based on this scheme, when the first communication apparatus needs system information and cannot currently acquire the system information, the first communication apparatus may notify the second communication apparatus that the system information is needed or that the system information cannot be acquired or that the BWP needs to be switched, and the second communication apparatus may schedule the first communication apparatus to operate on the BWP having the common search space or transmit the system information to the first communication apparatus through RRC signaling based on the notification of the first communication apparatus to enable the first communication apparatus to successfully acquire the needed system information.

In a possible implementation manner, the terminal device may trigger sending the second message to the network device when it is determined that the second condition is satisfied. The second condition includes any one or more of the following: the first communication device is currently in a connected state; the common search space is not configured on the BWP on which the first communication device operates, or the common search space is configured on the BWP on which the first communication device operates; the first communication device has the capability of performing the second service; the first communication device configures the first communication device to perform a second service; the first communication device receives fourth indication information of the second communication device, wherein the fourth indication information is used for indicating the first communication device to carry out a second service; a condition F that the first communication device does not store an effective version of required system information, wherein the required system information is system information required for performing the second service; the first communication device receives fifth indication information of the second communication device, wherein the fifth indication information is used for indicating that the second communication device has the capability of sending required system information; the first communication device is in an idle state or an inactive state; the first communication device receives or does not receive configuration information sent by the second communication device, wherein the configuration information is used for indicating sending resources of the second message; the first communication device receives the resource allocation of the request system information sent by the second communication device, and/or the first communication device receives the mapping relation between the resource allocation of the request system information sent by the second communication device and the system information; the first communication device does not receive the resource configuration of the request system information sent by the second communication device, and/or the first communication device does not receive the mapping relation between the resource configuration of the request system information sent by the second communication device and the system information.

In one possible implementation, the first communication device switches to operate on a BWP configured with a common search space.

The present application exemplarily provides the following four ways for the first communication device to send the second message to the second communication device.

Mode1, the first communication device sends the second message to the second communication device through a random access procedure.

Based on the mode1, the second message may be MSG1, and the second information may be a second preamble and/or resource information for transmitting MSG1. Alternatively, the second message may be MSG3 and the second information may be a second field in MSG3.

Mode2, the first communication device sends the second message to the second communication device through MAC signaling. The MAC signaling includes a MAC PDU, the MAC PDU includes one or more MAC sub-PDUs, the MAC sub-PDUs include a MAC sub-header and a MAC CE, the second information is carried in the MAC CE, and the MAC sub-header includes identification information for indicating the second information carried by the MAC CE.

Mode3, the first communication apparatus may transmit the second message to the second communication apparatus through RRC signaling.

When directed to the scenario of V2X traffic, RRC signaling may include SUI.

Mode4, the first communication device sends the second message according to the configuration information, and the configuration information is used for indicating the sending resource of the second message. Further, the configuration information may be configured by the second communication device, and the first communication device may receive the configuration information from the second communication device.

In this application, the first communication device enters an idle state or an inactive state, or switches to a BWP with a common search space to operate, and the first communication device re-acquires the required system information.

In the application, a first communication device receives an RRC signaling sent by a second communication device, wherein the RRC signaling comprises system information; alternatively, the first communication device may also receive system information broadcast by the second communication device.

When the system information includes the second SIB and the second communication apparatus transmits the second SIB to the first communication apparatus by way of RRC signaling, after the first communication apparatus acquires the second SIB by way of receiving RRC signaling, the first communication apparatus may perform any one or more of the following manners a to G.

In the method a, the first communication device stops the second timer corresponding to the second SIB acquired by receiving the broadcast.

In the mode B, the first communication device determines that the second timer corresponding to the second SIB acquired by receiving the broadcast is invalid for the second SIB acquired by receiving the RRC signaling.

In the method C, after the first communication device acquires the second SIB by receiving the RRC signaling, all the second SIBs except the second SIB acquired by receiving the RRC signaling are deleted.

In the method D, the first communication device acquires the second SIB by receiving RRC signaling, and deletes all versions of the second SIB acquired by receiving broadcast.

In the mode E, after the first communication device acquires the second SIB by receiving the RRC signaling, the first communication device starts or restarts the second timer corresponding to the second SIB acquired by receiving the RRC signaling.

In the mode F, when the first communication device successfully confirms that the second SIB acquired by receiving the RRC signaling is valid, the first communication device starts or restarts the second timer corresponding to the second SIB acquired by receiving the RRC signaling.

In the method G, the first communication device starts or restarts the second timer corresponding to the second SIB when the second SIB is successfully confirmed to be valid.

In a third aspect, the present application provides a communication method, where the method includes a first communication device receiving third indication information from a second communication device, and the first communication device may decode, according to the third indication information, an SIB of a communication scheme supported by the first communication device, where the third indication information is used to indicate sizes of system information blocks SIBs of different communication schemes.

Based on this scheme, the first communication device may skip or ignore the SIB of the communication scheme that is not supported by itself (or the SIB code stream of the communication scheme that is not supported by itself) based on the third indication information, so that the SIB of the communication scheme that is supported by itself may be successfully decoded.

In one possible implementation, the first communication device may ignore (or may be referred to as skipping) the SIB for the communication scheme not supported by the first communication device and decode the SIB for the communication scheme supported by the first communication device according to the third indication information.

In a fourth aspect, the present application provides a communication method including a second communication device receiving a first message from a first communication device, the second communication device sending first system information to the first communication device, the first message including first information indicating that the first communication device requests the first system information.

Wherein the first information includes any one or more of information indicating the first communication system, information indicating the first service, information indicating the first system information block SIB, and information indicating the first SI message. For example, when the first information includes information indicating the first communication system, the second communication device may send system information corresponding to the first communication system to the first communication device according to the information indicating the first communication system. When the first information includes information indicating the first service, the second communication device may send system information corresponding to the first service to the first communication device according to the information indicating the first service. When the first information includes information indicating the first system information block SIB, the second communication device may send system information corresponding to the first system information block SIB to the first communication device according to the information indicating the first system information block SIB. When the first information includes information indicating the first SI message, the second communication apparatus may send system information corresponding to the first SI message to the first communication apparatus according to the information indicating the first SI message.

In one possible implementation, the second communication device schedules the first communication device to operate on a BWP configured with a common search space for the first communication device to receive the first system information broadcast by the second communication device.

The present application exemplarily provides four ways for the second communication device to receive the first message from the first communication device.

In a first mode, the second communication device receives a first message sent by the first communication device through a random access process.

Based on the first mode, the first message is MSG1, the first information is a first preamble and/or resource information of transmitting MSG1, and the first preamble and/or resource information of transmitting MSG1 correspond to at least one system information of the first communication system. Further, the second communication device may configure a mapping relationship between the preamble and/or transmit the resource information of the MSG1 and the at least one system information of the communication system, where the mapping relationship includes a mapping relationship between the first preamble and/or transmit the resource information of the MSG1 and the at least one system information of the first communication system, and the second communication device may transmit the mapping relationship to the first communication device. Or the first message is MSG3, and the first information is a first field in MSG3.

In the second mode, the second communication device receives a first message sent by the first communication device through the MAC signaling. The MAC signaling comprises a MAC PDU, the MAC PDU comprises one or more MAC sub-PDUs, each MAC sub-PDU comprises a MAC sub-head and a MAC CE, first information is carried in the MAC CE, and the MAC sub-head comprises identification information used for indicating the first information carried by the MAC CE.

In a third mode, the second communication device receives a first message sent by the first communication device through RRC signaling.

When directed to the scenario of V2X traffic, RRC signaling may include SUI.

In a fourth mode, the second communication device receives a first message sent by the first communication device according to the configuration information, wherein the configuration information is used for indicating the sending resource of the first message, and the sending resource corresponds to the first system information. Further, the second communication device may configure configuration information, the configuration information including a correspondence between the transmission resource and the system information, the correspondence including a relationship between the transmission resource of the first message and the first system information.

In the present application, the second communication apparatus may transmit the first system information to the first communication apparatus by means of RRC signaling or by means of broadcasting.

In a fifth aspect, the present application provides a communication method comprising a second communication device receiving a second message from a first communication device, the second communication device sending system information to the first communication device. Wherein the second message includes second information for notifying the second communication apparatus that the first communication apparatus requires system information, or for notifying the second communication apparatus that the first communication apparatus cannot acquire system information, or for notifying the second communication apparatus that the first communication apparatus requires switching of BWP, or for notifying the second communication apparatus that the first communication apparatus will switch BWP.

In one possible implementation, when the first communication device is currently operating on a BWP that is not configured with a common search space, the second communication device may schedule the first communication device to operate on a BWP that is configured with a common search space.

The present application exemplarily provides the following four ways for the second communication apparatus to receive the second message transmitted from the first communication apparatus.

Mode1, the second communication apparatus receives a second message transmitted through a random access procedure from the first communication apparatus.

Based on the method 1, the second message may be MSG1, and the second information may be the second preamble and/or resource information for transmitting MSG1. Alternatively, the second message may be MSG3 and the second information may be a second field in MSG3.

Mode2, the second communication apparatus receives a second message transmitted by MAC signaling from the first communication apparatus. The MAC signaling includes a MAC PDU, the MAC PDU includes one or more MAC sub-PDUs, the MAC sub-PDUs include a MAC sub-header and a MAC control element CE, the second information is carried in the MAC CE, and the MAC sub-header includes identification information used for indicating the second information carried by the MAC CE.

Mode3, the second communication apparatus receives a second message transmitted by RRC signaling from the first communication apparatus.

When directed to the scenario of V2X traffic, RRC signaling may include SUI.

In mode4, the second communication device may receive a second message sent by the first communication device according to the configuration information, where the configuration information is used to indicate the sending resource of the second message. Further, the second communication device configures configuration information, which includes a correspondence between the transmission resource and the second message.

In the present application, the second communication apparatus may transmit the system information to the first communication apparatus by means of RRC signaling or by means of broadcasting.

In a possible implementation manner, the second communication device may determine the sent system information according to the capability information and/or the triggered service information reported by the first communication device. The second communication device may determine the system information sent to the first communication device through the RRC signaling according to any one or any more of the capability information reported by the first communication device, the triggered service information, and the second information carried in the second message, so that the first communication device successfully acquires the required system information.

In a sixth aspect, the present application provides a method of communication comprising a second communication device mapping system information blocks, SIBs, of different communication schemes into different SI messages. Further, optionally, the second communication device may send an SI message to the first communication device.

Based on the scheme, by mapping SIBs of different communication modes into different SI messages, the mapping relation between SIBs and SI messages is defined. Therefore, the terminal equipment supporting one or more communication systems can successfully decode the received SI message. Further, the terminal device may also be made unnecessary to receive the SI message containing the SIB for the communication system that is not supported by the terminal device itself.

In a possible implementation manner, the different communication systems include a third communication system and a fourth communication system, the third communication system is a new air interface NR, the fourth communication system is long term evolution LTE, the SIB of the third communication system includes an SIB of NR V2X and an NR SIB other than the SIB of NR V2X, and the SIB of the fourth communication system includes an SIB of LTE V2X and an SIB of LTE V2X other than the SIB of LTE V2X. Exemplarily, the second communication device may map the SIB of NR and the SIB of LTE V2X into different SI messages; or mapping SIB of NR V2X and SIB of LTE V2X into different SI messages; or mapping the SIB of NR V2X, the SIB of NR except the SIB of NR V2X and the SIB of LTE V2X into different SI messages respectively; or respectively mapping the SIB of LTE V2X, the SIB of LTE V2X except the SIB of LTE V2X and the SIB of NR to different SI messages; or mapping four SIBs of LTE V2X, SIBs of LTE V2X except SIBs of LTE V2X, SIBs of NR V2X, and SIBs of NR except SIBs of NR V2X into different SI messages respectively.

In a seventh aspect, the present application provides a communication method, where the method includes sending, by a second communication device, third indication information to a first communication device, where the third indication information is used to indicate sizes of system information blocks SIB of different communication schemes in an SI message.

Based on the scheme, the second communication device sends third indication information to the first communication device, so that the first communication device can successfully decode the SIB of the communication system supported by the first communication device based on the third indication information.

In an eighth aspect, the present application provides a communication method, where the method includes determining, by the second communication apparatus, that the third timer has expired or that the second system information has changed, and sending the second system information to the first communication apparatus through radio resource control, RRC, signaling.

Based on the scheme, when the system information stored in the first communication device is about to expire or is about to be invalidated or is expired or is invalidated, the first communication device does not need to request the second communication device for the system information, and the second communication device can actively transmit the second system information to the first communication device.

In one possible implementation, the second communication device maintains a third timer for the first communication device, wherein the third timer is associated with the second system information. For example, the third timer is started or restarted after the second communication device sends the second system information to the first communication device through RRC signaling, or when the second communication device sends the second system information to the first communication device through RRC signaling, or before the second communication device sends the second system information to the first communication device through RRC signaling.

Further, the network device may stop the third timer upon determining that the terminal device enters an idle state or an inactive state, or that the terminal device switches to operate on a BWP having the common search space.

In the present application, the second communication device may first determine the capability information of the first communication device and/or the triggered service information; and determining second system information based on the first communication device capability information and/or the service information. The network device may determine the second system information according to whether the terminal device triggers a certain service, is performing a certain service, has previously performed a certain service, or has the capability of performing a certain service.

In a ninth aspect, the present application provides a method of communication comprising a second communication device may map SIBs of different services into different SI messages, the second communication device may send the SI messages to a first communication device.

In one possible implementation, the V2X service and the services other than V2X are different services.

In one possible implementation, for example, where the communication scheme is NR, the second communication device may map NR SIBs other than NR V2X and SIBs of NR V2X into different SI messages. That is, the network device may map NR SIBs other than NR V2X into one SI message and may map SIBs of NR V2X into another SI message. For another example, the communication format is LTE, and the second communication device may map LTE SIBs other than LTE V2X and SIBs of LTE V2X into different SI messages. That is, the second communication device may map LTE SIBs other than LTE V2X into one SI message, and may map SIBs of LTE V2X into another SI message.

In a tenth aspect, the network device may send eleventh indication information to the terminal device, where the eleventh indication information is used to indicate whether a sidelink resource pool (SL resource pool) configuration is carried in V2X-related system information (e.g., V2X SIB). For example, the eleventh indication information may be carried in SIB1 or MIB, and the SL resource pool configuration may be a SL transmit resource pool configuration, or a SL receive resource pool configuration, or a SL transmit and receive resource pool configuration. Wherein, the V2X SIB refers to a SIB that can carry a SL transmission resource pool configuration and/or a SIB of a reception resource pool configuration.

In an eleventh aspect, an embodiment of the present application provides a communication apparatus having a function of implementing a network device or a terminal device in the foregoing embodiments. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions.

In one possible implementation, the communication device includes: a processor configured to support the communication apparatus to perform a corresponding function of the network device in the above-illustrated communication method. The communication device may also include a memory, which may be coupled to the processor, that retains program instructions and data necessary for the communication device. Optionally, the communication device further comprises a transceiver for supporting communication between the communication device and a terminal device or the like. The transceiver may be a separate receiver, a separate transmitter, a transceiver with integrated transceiving function, or an interface circuit.

In one possible implementation, the communication means may be a network device or may be a component of a network device, such as a chip or a system of chips or a circuit.

In another possible implementation, the communication device includes: a processor configured to support the communication apparatus to perform respective functions of the terminal device in the above-indicated communication method. The communication device may also include a memory, which may be coupled to the processor, that retains program instructions and data necessary for the communication device. Optionally, the communication apparatus further comprises a transceiver for supporting communication between the communication apparatus and a network device or the like. The transceiver may be a separate receiver, a separate transmitter, a transceiver with integrated transceiving function, or an interface circuit.

In one possible implementation, the communication means may be a terminal device or a component, such as a chip or a system of chips or a circuit, that may be used in a terminal device.

In a twelfth aspect, an embodiment of the present application provides a communication apparatus, configured to implement any one of the above first aspect or first aspect, or configured to implement any one of the above second aspect or second aspect, or configured to implement any one of the above third aspect or third aspect, or configured to implement any one of the above fourth aspect or fourth aspect, or configured to implement any one of the above fifth aspect or fifth aspect, or configured to implement any one of the above sixth aspect or sixth aspect, or configured to implement any one of the above seventh aspect or seventh aspect, or configured to implement any one of the above eighth aspect or eighth aspect, or configured to implement any one of the above ninth aspect or ninth aspect, or configured to implement any one of the above tenth aspect or tenth aspect, including corresponding functional modules, respectively configured to implement steps of the above methods. The functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In a possible implementation manner, the structure of the communication device includes a processing unit and a transceiver unit, and these units may perform corresponding functions in the foregoing method example, which is specifically referred to the detailed description in the method example, and are not described herein again.

In a thirteenth aspect, an embodiment of the present application provides a communication system, which includes a terminal device and a network device. Wherein, the terminal device may be configured to perform any one of the above first aspect or the first aspect, to perform any one of the above second aspect or the second aspect, or to implement any one of the above third aspect or the third aspect; the network device may be configured to perform any one of the above-mentioned fourth aspect or fourth aspect, or to implement any one of the above-mentioned fifth aspect or fifth aspect, or to implement any one of the above-mentioned sixth aspect or sixth aspect, or to implement any one of the above-mentioned seventh aspect or seventh aspect, or to implement any one of the above-mentioned eighth aspect or eighth aspect, or to implement any one of the above-mentioned ninth aspect or ninth aspect, or to implement any one of the above-mentioned tenth aspect or tenth aspect.

In a fourteenth aspect, the present application provides a chip system comprising a processor. Optionally, a memory may be further included, the memory is used for storing a computer program, and the processor is used for calling and running the computer program from the memory, so that the apparatus with the system-on-chip installed performs any method of the first to eighth aspects and possible implementation manners thereof.

In a fifteenth aspect, the present application provides a computer storage medium having instructions stored thereon, which, when run on a computer, cause the computer to perform the method of the first aspect or any possible implementation manner of the first aspect, or cause the computer to perform the method of the second aspect or any possible implementation manner of the second aspect, or cause the computer to perform any one of the above third aspect or third aspect, or cause the computer to perform any one of the fourth aspect or fourth aspect, or cause the computer to perform any one of the fifth aspect or fifth aspect, or cause the computer to perform any one of the above sixth aspect or sixth aspect, or cause the computer to perform any one of the above seventh aspect or seventh aspect, or cause the computer to perform any one of the above eighth aspect or eighth aspect, or cause the computer to perform any one of the above ninth aspect or ninth aspect, or cause the computer to perform any one of the above tenth aspect or tenth aspect.

Sixteenth aspect, embodiments of the present application provide a computer program product containing instructions, which when run on a computer, causes the computer to perform the method of the first aspect or any possible implementation manner of the first aspect, or causes the computer to perform the method of the second aspect or any possible implementation manner of the second aspect, or causes the computer to perform any one of the above third aspect or third aspect, or causes the computer to perform any one of the fourth aspect or fourth aspect, or causes the computer to perform any one of the fifth aspect or fifth aspect, or causes the computer to perform any one of the above sixth aspect or sixth aspect, or causes the computer to perform any one of the above seventh aspect or seventh aspect, or causes the computer to perform any one of the above eighth aspect or eighth aspect, or causes the computer to perform any one of the above ninth aspect or ninth aspect, or causes the computer to perform any one of the above tenth aspect or tenth aspect.

Drawings

Fig. 1a is a schematic structural diagram of a MAC subheader provided in the present application;

fig. 1b is a schematic structural diagram of another MAC subheader provided in the present application;

fig. 1c is a schematic structural diagram of another MAC subheader provided in the present application;

fig. 1d is a schematic structural diagram of a MAC PDU provided in the present application;

fig. 2a is a schematic diagram of a random access method provided in the present application;

fig. 2b is a schematic diagram of another random access method provided in the present application;

fig. 3 is a schematic diagram of a communication system architecture provided in the present application;

fig. 4 is a schematic flowchart of a communication method provided in the present application;

fig. 5a is a corresponding relationship between resource allocation requesting system information and system information provided in the present application;

fig. 5b is a corresponding relationship between resource allocation of a request system information and system information provided in the present application;

fig. 5c is a corresponding relationship between resource allocation and system information of another request system information provided by the present application;

FIG. 5d is a diagram illustrating a mapping relationship between resource allocation and system information for requesting system information according to another embodiment of the present disclosure;

fig. 5e is a corresponding relationship between resource allocation of another request system information and system information provided by the present application;

fig. 5f is a corresponding relationship between resource allocation of another request system information and system information provided by the present application;

fig. 5g is a corresponding relationship between resource allocation of another request system information and system information provided in the present application;

fig. 6a is a schematic structural diagram of a MAC CE indicating a request SI message in the form of a bit map provided in the present application;

fig. 6b is a schematic structural diagram of another MAC CE for indicating a request SI message in the form of a bit map provided in the present application;

fig. 6c is a schematic structural diagram of a MAC CE indicating a requested SI message in the form of an SI number provided in the present application;

fig. 6d is a schematic structural diagram of another MAC CE for indicating a requested SI message in the form of an SI number provided in the present application;

fig. 6e is a schematic structural diagram of a MAC CE that requests an SI message in the form of a combination of an SI number and a communication system according to the present application;

fig. 6f is a schematic structural diagram of another request SI message in the form of combination of an SI number and a communication system provided in the present application;

FIG. 7a is a schematic structural diagram of a MAC CE for indicating a request SIB in the form of a bit map according to the present application;

FIG. 7b is a schematic structural diagram of another MAC CE for indicating a request SIB in the form of a bit map according to the present application;

FIG. 7c is a diagram illustrating a structure of a MAC CE indicating a request SIB in the form of SIB number according to the present application;

FIG. 7d is a diagram illustrating another example of the structure of a MAC CE indicating a request SIB in the form of a SIB number;

fig. 8a is a schematic structural diagram of a MAC CE requesting an SIB of a first communication scheme according to the present application;

fig. 8b is a schematic structural diagram of another MAC CE requesting an SIB of the first communication scheme provided in the present application;

fig. 9a is a schematic structural diagram of a MAC CE requesting an SIB for a first service according to the present application;

FIG. 9b is a schematic structural diagram of another MAC CE for a SIB requesting a first service according to the present application;

fig. 10 is a schematic diagram illustrating a correspondence relationship between system information and transmission resources provided in the present application;

fig. 11 is a schematic method flow diagram of a communication method provided in the present application;

fig. 12a is a schematic structural diagram of another MAC CE provided in the present application;

fig. 12b is a schematic structural diagram of another MAC CE provided in the present application;

fig. 13 is a schematic method flow diagram of a communication method provided in the present application;

fig. 14 is a schematic method flow diagram of another communication method provided herein;

fig. 15 is a schematic structural diagram of a terminal device provided in the present application;

fig. 16 is a schematic structural diagram of a network device provided in the present application;

fig. 17 is a schematic structural diagram of a terminal device provided in the present application;

fig. 18 is a schematic structural diagram of a network device provided in the present application.

Detailed Description

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

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

1. System Information (SI)

The system information may be divided into a main system information block (MIB) and a plurality of System Information Blocks (SIBs). Here, the plurality of system information blocks are SIB1 to SIB9, for example.

The MIB may include parameters required to acquire SIB1, such as system frame number (SNF), etc.; cell barring status information and basic physical layer information of a cell that needs to further receive system information, etc. may also be included.

Different SIBs carry different parameters and have different functions. For example, system information related to cell reselection, public Warning information (PWS), timing (e.g., (global positioning System, GPS) Time, coordinated Universal Time (UTC) related information, etc.), V2X service (e.g., SL transmission resource pool, SL reception resource pool, SL configuration information, etc.), or positioning, etc. may be included. The PWS includes ETWS (Earthquake and Tsunami Warning System) notification or CMAS (public Mobile Alert Service) notification, etc.

SIB1 may carry scheduling information for other SIBs. For example, a mapping relationship of the SIB to the SI message, a window length of the SI message (e.g., SI-window), a period of the SI message; wherein, the period of the SI message refers to an interval in which a window of each SI message repeatedly appears, that is, an interval in which a window of the same SI message appears twice; the window length of the SI messages refers to the window length of each SI message, and the window lengths of the SI messages under one network device may be the same. The SIB1 may further include configuration information, such as a preamble and/or resource configuration, which indicates whether each SIB is always broadcast or provided for on-demand (on-demand), and is required when system information is requested. The SIB1 may also be called system information block type1.

It should be noted that the system information in this application may be an SI message or an SIB. That is, the system information described hereinafter in this application may include an SI message or may also include an SIB.

2. SI message (namely SI message)

One or more SIBs may be included in one SI message. The mapping relationship between SIBs and SI messages (i.e., which SIBs are included in one SI message) may be included in SIB1 (e.g., in the scheduling information). The scheduling information may indicate scheduling information of each SI message, including a scheduling period (SI-periodicity) and a type of SIB carried (i.e., a mapping relationship of the SIB to the SI message, etc.). Generally, the same SIB can be mapped in only one SI message, and cannot be mapped in two different SI messages in a split manner. SIBs with the same scheduling period may be mapped into one SI message. Each SI message is associated with a window of SI messages, the windows of SI messages of different SI messages not overlapping. That is, within a window of one SI message, only the SI message corresponding to the window of the SI message is transmitted. Both SIB1 and SI messages may be mapped on a Broadcast Control Channel (BCCH) and transmitted on a downlink shared channel (DL-SCH).

3. Common search spaces

The common search space may include search spaces for paging, random Access (RA), SIB1, other SI.

If the search space for random access is not configured on the BWP (e.g., there is no ra-SearchSpace), the terminal device cannot receive MSG2 sent by the network device on the BWP, that is, cannot acquire the SI message based on the random access procedure. That is, the terminal device in the connected state does not configure the common search space on the BWP, and cannot implement the process of requesting system information (on demand SI) on a random access basis.

If the search space for SIB1 is not configured on BWP (e.g., there is no searchSpaceSIB 1), the terminal device cannot receive SIB1 broadcasted by the network device on the BWP.

If no search space is configured for the other SI on the BWP (e.g., no searchSpaceother Systeminformation), the terminal device cannot receive the other SI broadcast by the network device on the BWP.

If no search space is configured for paging on the BWP (e.g., no pagingSearchSpace), the terminal device cannot receive pages on the BWP.

4. Media access control protocol data unit (MAC PDU)

One MAC PDU may consist of one or more MAC sub-PDUs, one MAC sub-PDU may include one MAC sub-header (which may include padding); or may also include a MAC subheader (MAC subheader) and a MAC SDU; or may also include a MAC subheader and a MAC CE; or may also include a MAC subheader and padding. It should be understood that one MAC subheader corresponds to one MAC Service Data Unit (SDU) or to one MAC CE or to padding.

The MAC subheader may include an LCID field, see, for example, fig. 1a, where R is a reserved bit and may be set to 0. A Logical Channel Identity (LCID) field indicating a type of a corresponding MAC SDU or a type of a corresponding MAC CE or a type of padding.

See, for example, fig. 1b and 1c. Wherein R is reserved bit and is set to be 0; an F format field indicating the number of bits included in the L field (for example, a value of 0 means that the L field is 8 bits, and a value of 1 means that the L field value is 16 bits); l is a length field indicating the number of bytes of the corresponding MAC SDU or MAC CE of variable size.

As shown in table 1, the value of the identifier of the logical channel of an uplink shared channel (UP-SCH) is provided in the present application. As can be seen from table 1, each logical channel identifier corresponds to an index number. The values in table 1 are an example, but not limiting.

TABLE 1 values of identities of logical channels of UP-SCH

Index	LCID values
		000000	CCCH of size other than 48bits
000001–100000	Identity of the logical channel
		100001	CCCH of size 48bits
100010–110100	Reserved
		110101	Recommended bit rate query
110110	Multiple Entry PHR(four octet Ci)
		110111	Configured Grant Confirmation
111000	Multiple Entry PHR(one octet Ci)
		111001	Single Entry PHR
111010	C-RNTI
		111011	Short Truncated BSR
111100	Long Truncated BSR
		111101	Short BSR
111110	Long BSR
		111111	Padding

It should be understood that MAC sub-PDUs of the same type can be placed together, as shown in fig. 1d, for a MAC PDU, the MAC sub-PDU containing the MAC CE is placed after the MAC sub-PDU containing the MAC SDU and before padding the MAC sub-PDU. Where padding is optional, i.e. the padding size may be 0. It should be noted that the MAC subheader is octet aligned.

5. Internet of vehicles (vehicle to eventing, V2X)

The V2X is a key technology of an intelligent transportation system, is considered to be one of the fields with the most industrial potential and the most clear market demand in an Internet of things system, has the characteristics of wide application space, large industrial potential and strong social benefit, and has important significance for promoting the innovative development of the automobile and information communication industry, constructing a new mode and new state of automobile and traffic service, promoting the innovation and application of technologies such as unmanned driving, auxiliary driving, intelligent driving, internet driving, intelligent internet driving, automatic driving, automobile sharing and the like, and improving the traffic efficiency and the safety level. The internet of vehicles generally refers to a communication Network that provides vehicle information through sensors, vehicle terminals, and the like mounted on a vehicle, and realizes mutual communication between a vehicle to vehicle (V2V), a vehicle to infrastructure (V2I), a vehicle to Network (V2N), and a vehicle to pedestrian (V2P).

Generally, in a V2X scenario, a communication link for performing direct communication between a terminal device and the terminal device may be referred to as a sidelink or a Sidelink (SL). The wireless communication link between the terminal device and the network device may be referred to as an Uplink (UL) or a Downlink (DL), and since the UL or DL interface may be referred to as a Uu port, the UL or DL may be referred to as a Uu port link.

The SL communication resource for performing wireless direct communication between the terminal devices may be scheduled by the network device, for example, the terminal devices may be within a coverage area of the network device, a wireless direct communication process between the terminal devices and the terminal devices may be controlled by the network device, and the terminal device serving as the data sending end may send a control signal and a data signal to the terminal device serving as the data receiving end on the SL communication resource configured by the network device. This mode in which the base station schedules SL transmission resources may be referred to as a first mode. Alternatively, the first mode may be a mode1 resource allocation mode or a mode3 resource allocation mode specified in a standard set by the third Generation Partnership project (3 rd Generation Partnership project,3 gpp).

For example, the base station scheduling SL transmission resources may include two different types of transmission resources, dynamic grant and configuration grant. The dynamic authorization is characterized in that the network device needs to allocate resources individually for each data transmission of the terminal device, and the method is characterized by "one-time allocation and one-time use", for example, the network device may dynamically allocate edge link transmission resources to the terminal device through Downlink Control Information (DCI), where the DCI may be carried by a physical downlink control channel. The configuration grant may be that each data transmission of the terminal device does not always require the network device to allocate resources individually, and after the network device allocates resources for the terminal device at a certain time, the terminal device may use the allocated resources for a period of time in the future, and is characterized by "one-time allocation and multiple-time usage", for example, the configuration grant may include type1 configuration grant (SL configured grant type-1), type2 configuration grant (SL configured grant type-2), grant free (SL grant free), and Semi-Persistent Scheduling (SL Semi-Persistent Scheduling, SL SPS). the type1 configuration grant may be a sidelink configuration grant that is directly configured to the terminal device by the network device through Radio Resource Control (RRC) signaling, and the terminal device may directly transmit data using the configuration grant resource without additional activation (e.g., activation through PDCCH/DCI). the type2 configuration authorization may be a period defined by the network device through RRC signaling, and then activated through PDCCH/DCI, the terminal device cannot directly use the configuration authorization resource to transmit data, and can only use the data after activation. The grant free may be a sidelink configuration grant directly configured to the terminal device by the network device through Radio Resource Control (RRC) signaling, and the terminal device may directly use the configuration grant resource to transmit data without additional activation (e.g., activation through PDCCH/DCI). The semi-persistent scheduling may be that the network device defines a period of configuration authorization through RRC signaling, and activates the configuration authorization through PDCCH/DCI, and the terminal device cannot directly use the configuration authorization resource to transmit data and can only use the data after activation. The main difference between dynamic and configuration grants is the grant, i.e. the flexibility of resource allocation and the overhead of resource allocation. Dynamic authorization, wherein the network needs to allocate authorization for each data transmission of the terminal equipment, and the resource allocation is flexible, but the resource allocation overhead is large; configuration authorization and one-time authorization allocation of network equipment, the terminal can be used for multiple times, the resource allocation cost is low, however, the allocated resources are not changed or adjusted within a long time, and the resource allocation is not flexible. The dynamic authorization is allocated by using a Physical Channel (such as a PDCCH, physical Downlink Control Channel, or Physical Downlink Control Channel), and the allocation is relatively quick; the configuration grant is configured using higher layer signaling (such as RRC signaling) or higher layer signaling (such as RRC signaling) plus a physical channel (such as PDCCH), and resource allocation is slow.

SL communication resources for performing wireless direct communication between terminal devices may also be determined by the terminal devices, without being scheduled and controlled by the network devices, for example, when the terminal devices are within a communication coverage of the network devices, the network devices configure SL Resource pools for the terminal devices through System broadcast (SIB) messages or dedicated Radio Resource Control (RRC) signaling, and the terminal device serving as a data transmitting end may obtain the SL communication resources from the master SL Resource pool and the slave SL Resource pools to transmit Control signals and data signals to the terminal device serving as a data receiving end; or, for example, the terminal device as a data sending end autonomously obtains the side link communication resource from the preconfigured SL resource pool to send the control signal and/or the data signal to the terminal device as a data receiving end outside the communication coverage of the network device. Illustratively, the terminal devices may perceive or compete for edge link transmission resources. Optionally, the terminal device sends the control signal by contending with another terminal device to obtain the appropriate SL communication resource in the SL resource pool, and/or the data signal, for example, the higher the priority of the V2X service to be transmitted in the terminal device is, the greater the chance that the terminal device contends for the appropriate SL communication resource in the SL resource pool is. Optionally, the terminal device may also pre-store the SL resource pool information, or the network device pre-configures the SL resource pool when the terminal device accesses the network. The mode in which the terminal device determines the SL transmission resource by itself may be referred to as a second mode; optionally, the second mode may be a mode2 resource configuration mode or a mode4 resource configuration mode specified in a standard established by 3 GPP.

6. Communication system

The communication systems include global system for mobile communication (GSM) technology, code Division Multiple Access (CDMA) communication technology, long Term Evolution (LTE) communication technology, new Radio (NR) communication technology, and other communication systems (such as 6G communication technology) appearing in the future.

7. Others (C)

"at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural.

In the following description, technical features related to the present application are described.

Fig. 2a is a schematic flow chart of a random access method. The random access method is a contention-based random access method, and comprises the following steps:

step 21, the terminal device sends MSG1 to the network device. Accordingly, the network device receives MSG1 from the terminal device.

In this step 21, MSG1, i.e. the random access request, includes a preamble, which may be randomly selected by the terminal device, and the terminal device may transmit MSG1 to the network device on a Random Access Channel (RACH).

Step 22, the network device sends MSG2 to the terminal device. Accordingly, the terminal device receives MSG2 from the network device.

Here, MSG2 is Random Access Response (RAR) information for the preamble, and may include reserved bits (generally denoted by R), a Timing Advance (TA) command, an uplink grant (uplink grant), and TC-RNTI. The TC-RNTI is a temporary cell radio network temporary identifier allocated to the terminal equipment by the network equipment.

Step 23, the terminal device sends MSG3 to the network device. Accordingly, the network device receives MSG3 from the terminal device.

And 24, the network equipment sends the MSG4 to the terminal equipment. Accordingly, the terminal device receives MSG4 from the network device.

Fig. 2b is a schematic flow chart of another random access method. The random access method is a non-contention based random access method. The method comprises the following steps:

step 210, the network device configures a special preamble for the terminal device. The preamble may be used to request system information.

Step 211, the terminal device sends MSG1 to the terminal device based on the special preamble configured by the network device. Accordingly, the network device receives MSG1 from the terminal device.

In this step 211, the network device may determine, based on the special preamble, the purpose of the terminal device to initiate the random access.

Step 212, the network device sends MSG2 to the terminal device. Accordingly, the terminal device receives MSG2 from the network device.

In the random access process, if the search space for random access is not configured, the terminal device cannot receive the MSG2 sent by the network device on the BWP, that is, cannot request and acquire the system information based on the random access process.

For convenience of introduction, in the following description, the first communication device is taken as a terminal device, and the second communication device is taken as a network device.

Based on the above, fig. 3 schematically illustrates an architecture diagram of a communication system provided in the present application. The communication system may include a network device and a terminal device. Fig. 3 illustrates an example of the network device 301 and two terminal devices 302. The network device 301 may communicate with the terminal device 302 in a wireless manner, and mainly utilizes a Uu air interface for transmission. The terminal devices 302 may communicate with each other in a wireless manner, mainly using Sidelink (SL) (also called side link) transmission, which may also be called device-to-device (D2D) communication, for example, in a V2X communication system, direct communication between V2V, V2P, and V2I is performed through the Sidelink, where the Sidelink is defined for direct communication between the terminal device and the terminal device, that is, communication between the terminal device and the terminal device does not need to be forwarded through a network device.

Among other things, 1) terminal devices, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices with wireless connection capabilities or processing devices connected to wireless modems. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The terminal device may include a user equipment (user equipment), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a vehicle-to-all (V2X) terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (IoT) terminal device, a subscriber unit (subscriber unit), a subscriber station (IoT station), a Mobile Station (MS), a remote station (remote station), an access point (access station), AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), mobile Terminal (MT), virtual Reality (VR) terminal, augmented Reality (AR) terminal, wireless terminal in industrial control (industrial control), wireless terminal in self driving (self driving), wireless terminal in remote medical (remote medical), wireless terminal in smart grid (smart grid), wireless terminal in transportation safety, wireless terminal in city (smart city), wireless terminal in smart home (smart home), user agent (user agent), or user equipment (user device), etc. For example, mobile telephones (otherwise known as "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, radio FRequency Identification (RFID), sensors, global Positioning Systems (GPS), laser scanners, and the like.

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

2) Network devices, including, for example, access Network (AN) devices, also referred to as radio access network devices, are devices for accessing terminal devices into a wireless network. Such as a base station (e.g., an access point), may refer to a device in an access network that communicates with wireless terminal devices over one or more cells over an air interface, and, for example, an access network device in vehicle-to-all (V2X) technology may be a Road Side Unit (RSU). The base station may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting V2X applications and may exchange messages with other entities supporting V2X applications. The access network device may also coordinate attribute management for the air interface. Illustratively, the access network device may include an evolved Node B (NodeB, eNB, or e-NodeB) in an LTE system or an advanced long term evolution-advanced (LTE-a), or may also include a next generation Node B (nb), a transmission reception Node (TRP) (also called a transceiver Node), a baseband processing Unit (BBU), and a Radio frequency Unit (Radio Remote, RRU) in the fifth generation mobile communication technology (the 5 g) NR system, or may also include a centralized Unit (centralized) and an Active Antenna Unit (AAU) in a Cloud access network (Cloud access network, RAN) system, or may also include a centralized Unit (RNC, and a distributed Unit (RNC) in a network system, or may also include a Radio base station (BSC, radio base station, BSC), or a wireless network controller (BSC), or may also include a Radio network controller, a Radio Base Station (BSC), or a Radio network control Unit (BSC), or may also include a Radio access network controller (BSC), or a Radio network control Unit (Radio base station BSC), or a wireless network controller. The embodiments of the present application are not limited.

Of course, the network device may also include a core network device, a wireless relay device, a backhaul device, and the like, but since the technical solution provided in the embodiment of the present application mainly relates to an access network device, hereinafter, if there is no specific description, the "network device" described hereinafter refers to the access network device.

The various terminal devices and network devices described above may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted. If located on a vehicle (e.g. placed in or mounted in a vehicle), may be considered to be a vehicle terminal device, also referred to as an on-board unit (OBU), for example. The system can also be deployed on the water surface, or can also be deployed on airplanes, balloons and satellites in the air, which is not limited in the application.

In the present application, the communication system may be a global system for mobile communication (GSM), a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a Worldwide Interoperability for Microwave Access (WiMAX) system, a Long Term Evolution (LTE) system, a 5G communication system (e.g., a new radio, NR) system, a communication system in which multiple communication technologies are merged (e.g., a communication system in which an LTE technology and an NR technology are merged), or another communication system such as a Public Land Mobile Network (PLMN) system, or another communication system that may appear in the future, and the present application is not limited.

The form and number of the network devices and the terminal devices shown in fig. 3 are only for example and do not constitute a limitation to the present application.

It should be noted that the system architecture and the scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it is known by a person of ordinary skill in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems with the evolution of the network architecture and the appearance of a new scenario. Before introducing the method of the present application, based on the communication system architecture introduced in fig. 3, the application scenario involved in the present application is further described to facilitate understanding of the present solution. When a communication system has multiple communication systems and a terminal device needs system information, for example, when the terminal device needs certain system information and does not currently store an effective version of the system information, how the terminal device requests the system information, how a network device sends the system information, and the like, there is no relevant description at present.

In view of the above technical problems, the following describes technical solutions provided by embodiments of the present application with reference to the accompanying drawings.

In the following description, the communication method is applied to the system architecture shown in fig. 3 as an example. In addition, the communication method may be performed by two communication apparatuses, which are exemplified by a first communication apparatus and a second communication apparatus, wherein the first communication apparatus may be a terminal device or a communication apparatus capable of supporting a function required for implementing the method, and may of course be other communication apparatuses such as a system on a chip. The same is true for the second communication device, which may be a network device or a communication device capable of supporting the functions required for implementing the method, but may also be other communication devices, such as a system-on-chip. The implementation manners of the first communication device and the second communication device are not limited, for example, the first communication device may be a terminal device, and the second communication device is a network device; or the first communication device is a terminal equipment and the second communication device is a communication device capable of supporting the functions required for realizing the method on the network equipment side.

For ease of introduction, in the following, the method is performed by a network device and a terminal device as an example. Fig. 4 illustrates a communication method provided by an embodiment of the present application, and the method includes the following steps.

Step 401, the terminal device sends a first message to the network device. Accordingly, the network device receives a first message from the terminal device.

Here, the first message includes first information, and the first information is used to indicate that the terminal device requests the first system information, and may be explicitly indicated or implicitly indicated. The first information may also implicitly indicate that the second communication device is notified that the first communication device requires system information; or, notifying the second communication device that the first communication device cannot currently acquire the system information, and further, implicitly indicating to notify the second communication device that the first communication device cannot currently acquire the system information by receiving the broadcast; or, notifying the second communication device that the first communication device needs to switch the partial bandwidth BWP; or for notifying the second communication device that the first communication device is to switch BWP.

Illustratively, the first system information may include the first SI message and may also include the first SIB.

The first information may comprise any one or any plurality of the following: 1) Information for indicating a first communication system, where the first communication system may be NR, LTE, or the like; 2) Information indicating a first service, which may be a V2X service, for example, a V2X service of NR or a V2X service of LTE; 3) Information indicating the first SIB, for example, a first SIB number, or a bit map (bit map) indicating the first SIB; 4) Information indicating the first SI message, such as a first SI message number, or a bitmap (bit map) representing the first SI message, etc.

The application exemplarily provides four ways that the following terminal device sends the first message to the network device.

In the first mode, the terminal device sends a first message to the network device through a random access process. Accordingly, the network device receives a first message sent by the terminal device through a random access process.

The terminal device sends the first message to the network device may be divided into the following two cases.

In case 1, the first message may be MSG1, and the first information may be the first preamble and/or resource information for transmitting MSG1.

The preamble and/or the resource information for transmitting MSG1 may also be collectively referred to as a resource configuration for requesting system information. The resource allocation of one request system information corresponds to at least one system information, or the resource allocation of one request system information corresponds to at least one system information of the first communication system, or the resource allocation of one request system information corresponds to at least one system information related to the first service. One system information may include at least one SIB or at least one SI message. Exemplarily, the first preamble and/or the resource information of transmitting MSG1 may also be collectively referred to as a resource configuration requesting the first system information; the resource configuration for requesting the first system information corresponds to at least one system information of the first communication system, or the resource configuration for requesting the first system information corresponds to at least one system information related to the first service. The first system information may include at least one first SIB or at least one first SI message.

It should be noted that the mapping relationship between the resource configuration (i.e., the preamble and/or the resource information for transmitting the MSG 1) for requesting the system information and the system information may be configured by the network device, may also be pre-agreed between the network device and the terminal device, or may also be determined by the terminal device according to a preset rule, or may also be predefined by a protocol, which is not limited in this application.

In the present application, a resource configuration for requesting system information corresponds to one or more system information. Fig. 5a illustrates a correspondence between a resource configuration of a request for system information and the system information. As shown in fig. 5a, by taking an example of 4 resource configurations requesting system information, a resource configuration a-1 requesting system information corresponds to system information a-1, a resource configuration a-2 requesting system information corresponds to system information a-2, a resource configuration a-3 requesting system information corresponds to system information a-3 and system information a-4, and a resource configuration a-4 requesting system information corresponds to system information a-5 to system information a-8. It should be understood that in this case 1.1, the resource configuration requesting the system information includes a resource configuration requesting the first system information, and the first system information is included in the system information. As follows, a possible situation of the mapping relationship between the resource configuration of the request system information and the system information is specifically given. It should be noted that the mapping relationship between the resource configuration (i.e. the preamble and/or the resource information of the transmitting MSG 1) of the system information and the system information may be any combination of the following situations.

Case 1.1, a resource configuration for requesting system information corresponds to one or more system information of the first communication system. Fig. 5b is an example, which illustrates an example of resource configuration configured with 4 pieces of request system information, where resource configuration b-1 of the request system information corresponds to system information b-1 of the first communication system, resource configuration b-2 of the request system information corresponds to system information b-2 of the first communication system, resource configuration b-3 of the request system information corresponds to system information b-3 of the first communication system, and resource configuration b-4 of the request system information corresponds to system information b-4 of the first communication system.

Fig. 5c is an example, which illustrates a resource configuration configured with 4 request system information, where the resource configuration c-1 requesting the system information corresponds to the system information c-1 of the first communication system, the resource configuration c-2 requesting the system information corresponds to the system information c-2 of the first communication system to the system information c-4 of the first communication system, the resource configuration c-3 requesting the system information corresponds to the system information c-5 of the second communication system, and the resource configuration c-4 requesting the system information corresponds to the system information c-6 of the second communication system to the system information c-8 of the second communication system.

Illustratively, the resource configurations of the positive number of request system information are respectively in one-to-one correspondence with the system information of the first communication system, and the resource configurations of the negative number of request system information are respectively in one-to-one correspondence with the system information of the second communication system. For example, the network device is configured with 10 resource configurations requesting system information, there are 5 NR system information and 5 LTE system information, and then the resource configurations requesting system information from 1 st to 5th correspond to the 5 NR system information one by one, and the resource configurations requesting system information from 10 th to 6 th correspond to the 5 LTE system information one by one.

In case 1.2, the resource allocation for one request system information corresponds to all system information of one communication system.

For example, (n-1) resource configurations of the request system information correspond to system information of the first communication scheme, resource configurations of the remaining 1 request system information correspond to all system information of the second communication scheme, and n is an integer greater than or equal to 1, where all system information of the second communication scheme may be: the broadcast state is all the system information of the second communication system which is not broadcasted all the time, or all the system information of the second communication system.

First, referring to fig. 5d, a resource configuration configured with 4 request system information is illustrated, where a resource configuration d-1 requesting system information corresponds to system information d-1 of NR, a resource configuration d-2 requesting system information corresponds to system information d-2 of NR, a resource configuration d-3 requesting system information corresponds to system information d-3 of NR, and a resource configuration d-4 requesting system information corresponds to all system information of LTE.

In the second example, the resource allocation of a certain request system information corresponds to all system information of a communication system. If two resource configurations are configured for requesting system information, it can be defined: one of the resource configurations for requesting system information corresponds to all system information of the first communication system, and the other resource configuration for requesting system information corresponds to all system information of the second communication system. As shown in fig. 5e, the resource configuration e-1 requesting system information corresponds to all the system information of NR, and the resource configuration e-2 requesting system information corresponds to all the system information of LTE.

Case 1.3, a resource configuration requesting system information corresponds to one or more or all service-related system information. As shown in fig. 5f, taking a V2X service and a resource configuration configured with 3 pieces of request system information as an example, the resource configuration f-1 requesting the system information corresponds to the system information f-1 of the NR V2X service, the resource configuration f-2 requesting the system information corresponds to the system information f-2 of the NR V2X service and the system information f-3 of the NR V2X service, and the resource configuration f-3 requesting the system information corresponds to all the system information of the LTE V2X service.

Case 1.4, one resource configuration requesting system information corresponds to all system information.

For example, if the network device is configured with only 1 resource configuration requesting system information, the resource configuration requesting system information may correspond to all the system information. For example, as shown in fig. 5g, if the network supports the transmission of system information of NR and LTE, the resource configuration g-1 requesting system information may correspond to all system information of NR and all system information of LTE. It is to be understood that the overall system information may be: the broadcast state is all the system information which is not broadcasted all the time, or all the system information, or the broadcast state of all the communication systems is all the system information which is not broadcasted all the time.

It should be noted that, the description of the above cases only describes the case of one or two communication systems, but the present application is not limited to only these two communication systems, and the above contents are also applicable if there are multiple communication systems.

If the mapping relationship between the resource configuration of the request system information and the system information is configured by the network device, the network device may first send the mapping relationship between the resource configuration of the request system information and the system information to the terminal device. Optionally, the network device may send the resource configuration requesting the system information to the terminal device through the SIB1 or the MIB, and/or send the mapping relationship between the resource configuration requesting the system information and the system information. Further, the mapping relationship includes a relationship between the resource configuration for requesting the first system information and the system information of the first communication system.

Based on this situation 1, the terminal device may send MSG1 to the network device according to the received resource configuration requesting system information, based on step 211 in the random access procedure shown in fig. 2 b. Accordingly, after receiving the MSG1 from the terminal device, the network device knows that it is a random access procedure triggered by the terminal device due to the request for the first system information. Further, the network device may determine the first system information requested by the terminal device according to the first preamble included in the MSG1 and/or the resource information of the transmitting MSG1.

In case 2, the first message may be MSG3, and the first information is a first field in MSG3.

In one possible implementation, such as step 23 in the random access procedure shown in fig. 2a, the terminal device sends a system information request to the network device through MSG3. MSG3 carries an RRC message for requesting system information, and a first field for requesting the first system information is defined in the RRC message.

Based on this case 2, four cases, case 2.1, case 2.2, case 2.3, and case 2.4, can be divided.

Case 2.1, the first field is the added field.

Based on the newly added fields in case 2.1, three cases can be divided, namely case 2.1.1, case 2.1.2 and case 2.1.3.

Case 2.1.1, the first field is a newly added field in an RRC message (e.g., an rrcsysteinforequest message) for requesting system information, and the newly added first field may indicate that one or more or all system information of the first communication format is requested. That is, in this case 2.1.1, the first system information may be certain system information of the first communication scheme. Illustratively, the specific form may be the following code:

the requested-SI-RAT1-List is the newly added first field, a string (bit string) in the newly added first field may be set to occupy 1bit, 2bit, or 32bit, without limitation, that is, the maxSI-message-RAT1 may be set to 1, 2, or 32bit, without limitation, the requested-SI-RAT1-List may be defined as requesting one or more or all system information of the first communication standard (RAT 1), and each bit in the requested-SI-RAT1-List corresponds to one or more or all system information of RAT 1.

RAT1 may be LTE, or may also be NR, or may also be another communication system appearing in the future. If RAT1 is LTE and the first field may be in the form of a requested-SI-LTE-List, the first field may also be defined to request one or more or all system information of LTE; if the RAT is NR and the first field can be in the form of a requested-SI-NR-List, the first field can also be defined as one or more or all of the system information requesting NR.

It should be understood that the requested SI message is listed in the bit string in the requested-SI-list field in the rrcsysteinforequest message (i.e., the field is a list of SI messages). That is, the requested-SI-List contains the List of requested SI messages, which may be specifically determined according to the SI messages configured in the scheduling information in SIB1. For example, each bit corresponds to one SI message listed in the scheduling information.

Case 2.1.2, a first field indicating that all system information of the first communication scheme is requested is newly added in an RRC message (e.g., an RRC system inforequest message) for requesting system information. It is understood that all system information of the first communication system may be: the broadcast state is all the system information of the first communication system which is not always broadcast, or all the system information of the first communication system. That is, in this case 2.1.2, the first system information includes all the system information of the first communication system. For example, the first field may indicate that all system information of NR is requested, or the first field may indicate that all system information of LTE is requested. All the system information of the first communication system requested can be expressed by 1 bit. It is also understood that the presence of the first field indicates that all system information of the first communication system is requested, and the content of the specific first field may be indicated by 1 or 0, or may be indicated by true. Illustratively, the specific form may be the following code:

case 2.1.3, a first field is newly added in an RRC message (e.g., an rrcsysteininforequest message) for requesting system information, the first field indicating an SI message number or indicating an SIB number. That is, when the first system information is an SI message, the first field indicates an indication SI message number; when the first system information is an SIB number, the first field indicates an indication of the SIB number. Illustratively, the specific form may be the following code:

RRCSystemInfoRequest：：＝SEQUENCE{

requested-SI-List bit string(SIZE(maxSI-message))， --32bit

requested-SI/SIB-number INTEGER(0..31) OPTIONAL，

}. Wherein, (0.. 31) represents taking an integer between 0 and 31.

Case 2.2, in the RRC message for requesting system information (e.g., the rrcsysteinforequest message), for the list for SI request (e.g., the requested-SI-list field in the rrcsysteinforequest message), different bits correspond to different meanings for requesting different system information.

Case 2.2.1, one bit corresponds to one or more system information.

It should be noted that one system information may include one system information of NR or one system information of LTE. Specifically, one system information may include any one or any plurality of one SIB for NR, one SI message for NR, one SIB for LTE, and one SI message for LTE.

Optionally, one bit may correspond to one or more pieces of system information of the first communication system.

Illustratively, one bit corresponds to one system information, i.e., one bit corresponds to one system information. For example, bits from the leftmost side of bit string may correspond to the system information of NR one by one, and bits from the rightmost side of bit string may correspond to the system information of LTE one by one.

In case 2.2.2, one bit corresponds to all system information of one communication system.

Illustratively, one bit of the 32 bits corresponds to all system information of the first communication system. For example, a certain bit of 32 bits corresponds to all system information of NR, or a certain bit of 32 bits corresponds to all system information of NR V2X.

It is understood that all the system information of the first communication system may be: the broadcast state is all the system information of the first communication system which is not broadcasted all the time, or all the system information of the first communication system. Wherein, the all system information may include all SIBs or all SI messages.

Optionally, (N-1) bits correspond to system information of the first communication scheme, the remaining one bit corresponds to all system information of the second communication scheme, and N is an integer greater than or equal to 1. Illustratively, a bit corresponds to all system information of one communication system. If two bits are configured, then it is possible to define: one bit corresponds to all system information of the first communication system, and the other bit corresponds to all system information of the second communication system. All system information of the second communication system may be: the broadcast status is all system information of the second communication system that is not always broadcast (e.g., on demand status), or all system information of the second communication system. The broadcast status includes two types: broadcasting is always carried out and broadcasting is carried out after a system request is received.

Case 2.2.3, a bit corresponds to one or more or all system information related to a service.

Case 2.2.4, one bit corresponds to all system information.

Wherein, all the system information may be: the broadcast state is all the system information which is not broadcasted all the time, or all the system information which is not broadcasted all the time of communication system.

Based on the above case 2, the terminal device sends MSG3 to the network device, and the MSG3 includes the first field. Correspondingly, the network equipment receives MSG3 from the terminal equipment, and can determine the first system information according to the first field in the MSG3.

It should be noted that, the description of the above cases only describes the case of one or two communication systems, but the present application is not limited to only these two cases, and the above contents are also applicable if there are multiple communication systems.

And in the second mode, the terminal equipment sends the first message to the network equipment through the MAC signaling. Accordingly, the network device receiving terminal device sends the first message to the network device through the MAC signaling.

The MAC signaling includes a MAC PDU including one or more MAC sub-PDUs including a MAC sub-header and a MAC CE in which the first information may be carried. The MAC subheader includes identification information for indicating first information carried by the MAC CE, where the identification information of the first information may be a logical channel identification LCID, that is, the MAC CE may be identified by using a separate logical channel identification LCID. That is, a row may be added to the value of the logical channel identifier shown in table 1 above to identify the value and the index number of the extended MAC CE. For example, a MAC CE requesting system information may be identified by some index number in a Reserved bit (Reserved) in table 1. For example, when the LCID is 100010, the MAC CE requesting the system information is identified. In one possible implementation, the MAC signaling may be referred to as system information request MAC CE. It should be understood that the second way may also be understood as being through an extension to the format of the MAC CE.

Based on the second mode, the following four cases can be classified based on the minimum unit of the first system information requested by the first message.

In case a, the first system information comprises a first SI message, i.e. the requested unit is an SI message. In this case a, the first information may be in the form of a bit map or SI number.

As shown in fig. 6a, a schematic structural diagram of a MAC CE for indicating a request SI message in the form of a bit map is provided in the present application. The MAC CE may be 32bit, each of the MAC CEsbit may correspond to an SI message, for example, 1 may represent a request, and 0 may represent no request; or 0 may be used to indicate a request, and 1 may be used to indicate no request; or may be embodied in other forms without limitation. The size of the MAC CE may be fixed. Fig. 6a is only an example, and the MAC CE may not be 32bit, which is not limited in this application. Illustratively, if the SI message requested by the terminal device to the network device is SI ₅ And SI ₆ And a request is denoted by 1, the structure of the MAC CE transmitted by the terminal device to the network device may be as shown in fig. 6 b.

As shown in fig. 6c, a schematic structural diagram of a MAC CE for indicating a requested SI message in the form of an SI number (SI number) is provided for the present application. As shown in fig. 6c, the MAC CE is variable in size, one SI number occupies 6 bits, the MAC CE is octet aligned, and the reserved bit R is complemented by 0. It should be noted that the SI number may also occupy less than 6 bits or more than 6 bits, which is not limited in this application. Illustratively, if the SI numbers requested by the terminal device from the network device are SI number 1, SI number2, SI number3, and SI number5, the binary number corresponding to SI number 1 is 000001, the binary number corresponding to SI number2 is 000010, the binary number corresponding to SI number3 is 000011, and the binary number corresponding to SI number5 is 000101, the structure of the MAC CE sent by the terminal device to the network device may be as shown in fig. 6 d. The size of the MAC CE may be variable.

As shown in fig. 6e, a schematic structural diagram of a MAC CE requesting an SI message in the form of a combination of an SI number and a communication standard (RAT) is provided in the present application. As shown in fig. 6e, the SI number in the MAC CE occupies 6 bits, the communication system may occupy 1bit, and the reserved bit R complements 0, where the number of bits occupied by the SI number and the number of bits occupied by the communication system may be other numbers, which is not limited in this application. When the RAT bit is 0, the system information of NR is requested, and when the RAT bit is 1, the system information of LTE is requested; alternatively, 1 may indicate that NR is requested, and 0 indicates that LTE is requested. Illustratively, if the system information (e.g., SI message) of different communication systems is numbered separately, a RAT bit of 1 indicates that NR is requested, and a RAT bit of 0 indicates that LTE is requested. The first system information requested by the terminal device is SI number3 of LTE and SI number5 of NR, where a binary number corresponding to SI number3 is 000011, and a binary number corresponding to SI number5 is 000101, and then the structure of the MAC CE sent by the terminal device to the network device may be as shown in fig. 6 f. If one SI message includes SIBs of different communication schemes, the first system information requested by the terminal device is LTE system information in SI number3 and NR system information in SI number5, that is, SI number3 may include system information of two communication schemes, and SI number5 may also include system information of two communication schemes, so that it is further required to indicate a communication scheme corresponding to the requested system information, further, a binary number corresponding to SI number3 is 000011, and a binary number corresponding to SI number5 is 000101, and a structure of the MAC CE sent by the terminal device to the network device may be as shown in fig. 6 f. The size of the MAC CE may be variable.

In case B, the first system information includes a first SIB, i.e., the requested unit is a SIB. In this case B, the first information may be in the form of a bit map or SIB number.

Fig. 7a is a schematic diagram illustrating a structure of a MAC CE indicating a request SIB in the form of a bit map provided for the present application. As shown in fig. 7a, the MAC CE may be 32 bits, or the MAC CE may also be other bit numbers, which is not limited in this application. Each SIB in the MAC CE may correspond to one bit, and for example, 1 may be used to indicate a request, and 0 may be used to indicate no request; alternatively, 0 may be used to indicate a request, and 1 may be used to indicate no request, which is not limited in this application. Illustratively, if the SIB requested by the terminal device from the network device is SIB ₅ And SIB ₆ And a request is denoted by 1, the structure of the MAC CE transmitted by the terminal device to the network device may be as shown in fig. 7 b. The size of the MAC CE may be fixed.

As shown in fig. 7c, a schematic diagram of a MAC CE for indicating a requested SIB in the form of an SIB number is provided for the present application. As shown in fig. 7c, the MAC CE is variable in size, one SIB occupies 6 bits, the MAC CE is octet-aligned, and the reserved bit R is padded with 0. It should be noted that the SIB number may also occupy less than 6 bits or more than 6 bits, which is not limited in this application. Illustratively, if SIB numbers SIB number2, SIB number3, and SIB number5 requested by the terminal device from the network device, binary number corresponding to SIB number2 is 000010, binary number corresponding to SIB number3 is 000011, binary number corresponding to SIB number5 is 000101, the structure of the MAC CE transmitted by the terminal device to the network device may be as shown in fig. 7 d. The size of the MAC CE may be variable.

In case C, the first system information includes an SIB of the first communication system, that is, the requested unit is the communication system.

As shown in fig. 8a, a schematic structural diagram of a MAC CE requesting an SIB of a first communication format is provided in the present application. As shown in fig. 8a, the size of the MAC CE may be fixed, and the communication system may occupy 2 bits, or occupy more than 2 bits or less than 2 bits, where fig. 8a only uses 2 bits as an example. For example, when the RAT bit is 00, the system information of LTE may be requested, and when the RAT bit is 01, the system information of LTE may be requested, etc. For example, if the first communication system is NR, the structure of the MAC CE transmitted by the terminal device to the network device may be as shown in fig. 8 b. And after receiving the MAC CE, the network equipment sends all SIBs with communication modes of NR to the terminal equipment.

In case D, the first system information includes system information related to the first service, i.e., the unit of the request is a service (service).

In one possible implementation, a service may correspond to a value, as shown in table 3, which is a relationship between a service and a value provided by the present application.

TABLE 3 services and values

Business	Value of
		Service 1 (LTE V2X service)	000000
Service 2 (NR V2X service)	000001
		…	…

Fig. 9a is a schematic structural diagram of a MAC CE for requesting system information related to a first service according to the present application. The MAC CE is variable in size, and the service may occupy 6 bits, or occupy more than 6 bits or less than 6 bits, and fig. 9a only uses 6 bits as an example, without limitation. For example, if the terminal device requests the network device for the SIB related to service 1 and service 2 or the SI message related to service 1 and service 2, the MAC CE sent by the terminal device to the network device may be as shown in fig. 9 b. After receiving the MAC CE, the network device sends all SIBs related to the service 1 and the service 2 or all SIs related to the service 1 and the service 2 to the terminal device.

It should be noted that the corresponding relationship between the service and the system information may be configured by the network device for the terminal device, may also be predetermined by the terminal device and the network device, or may also be determined by the terminal device according to a preset rule, or may also be predefined by a protocol, which is not limited in this application.

In a third mode, the terminal device may send the first message to the network device through RRC signaling (or may also be referred to as RRC-specific signaling). Accordingly, the network device may receive a first message from the terminal device sent by RRC signaling.

Based on the third mode, the following two situations can be divided.

In case i, an RRC signaling is defined. Optionally, the RRC signaling may be used to send the first message to the network device, so that the terminal device requests the network device for the first system information.

Case ii, the proprietary signaling may include SUI.

This case ii applies to a scenario in which the terminal device is only for V2X services. That is to say, when the terminal device performs the V2X service, the first message may be sent to the network device through the SUI.

For the third mode, the following examples may be included:

as an example, the RRC signaling may contain information of the requested SI message, i.e. the unit of the request is the SI message. Specifically, the format may be bit string or SI number. The terminal equipment can send the requested SI number or bit string corresponding to the first system information to the network equipment through the RRC signaling. Accordingly, after receiving the RRC signaling, the network device may send the first system information to the terminal device.

In example two, the RRC signaling may include information of the requested SIB, that is, the unit of the request is the SIB, and specifically, the unit may be bit string or SIB number. And the terminal equipment sends the SIB number or bit string corresponding to the requested first system information to the network equipment through the RRC signaling. Accordingly, after receiving the RRC signaling, the network device may send the first system information to the terminal device.

In example three, the RRC signaling may include information of a communication system of the requested system information, that is, a unit of the request is the communication system. And the terminal equipment sends the communication system corresponding to the requested first system information to the network equipment through the RRC signaling. Accordingly, after receiving the RRC signaling, the network device may send the first system information to the terminal device. For example, if the RRC signaling may be defined as NR, the network device sends system information of all NRs to the terminal device after receiving the RRC signaling.

Example four, the RRC signaling may contain information of the service related to the requested system information, i.e., the unit of the request is the service. The end device sends the requested service corresponding to the first system information to the network device through the RRC signaling, and after receiving the RRC signaling, the network device may send all SIBs or all SI messages corresponding to the requested service to the terminal device. For example, to perform one LTE V2X service, the network device may send all SIBs or all SI messages of the LTE V2X service to the terminal device.

In a fourth mode, the terminal device may send the first message according to the configuration information, where the configuration information is used to indicate a sending resource of the first message. Accordingly, the network device may receive a first message sent by the terminal device according to the configuration information.

In the fourth aspect, the transmission resource of the first message and/or the first message corresponds to the first system information. The transmission resource of the first message may be a resource location of a Physical Uplink Control Channel (PUCCH). The terminal device can determine the transmission resource corresponding to the requested first system information, and transmit the first message on the corresponding transmission resource, and the network device can determine that the first message corresponds to the first system information after receiving the first message on the transmission resource. Fig. 10 is a schematic diagram of a corresponding relationship between system information and transmission resources, that is, a schematic diagram of configuration information. I.e. by sending resource a ₁ Sending a first message corresponding to the requested system information as B ₁ By sending resource A ₂ Sending a first message corresponding to the requested system information as B ₂ By sending resource A ₃ Sending a first message corresponding to the requested system information as B ₃ By sending resource A ₄ Sending a first message corresponding to the requested system information as B ₄ By sending resource A _n Sending a first message corresponding to the requested system information as B _n . The relationship between the transmission resource and the system information shown in fig. 10 includes a corresponding relationship between the resource for transmitting the first message and the first system information.

It should be noted that one transmission resource may correspond to one or several SIBs, or one or several SI messages.

In case a, different SI messages may correspond to different transmission resources. For example, SI message a corresponds to transmission resource a and SI message B corresponds to transmission resource B. That is, the terminal device may send the first message on transmission resource a when requesting SI message a; the first message may be sent on transmission resource B when SI message B is requested.

In case b, different SIBs may correspond to different transmission resources. For example, SIB2 corresponds to transmission resource 2 and SIBB 3 corresponds to transmission resource 3. That is, the terminal device may send the first message on transmission resource 2 when requesting SIB 2; the first message may be sent on transmission resource 3 when SIB3 is requested.

In case c, the system information of different communication systems may correspond to different transmission resources. For example, the transmission resource a corresponds to system information of a first communication scheme, and the transmission resource b corresponds to system information of a second communication scheme. That is, when requesting system information of a first communication system, the terminal device may send a first message on the transmission resource a; the first message may be transmitted on transmission resource b when requesting system information of the second communication scheme.

In case d, the system information of different communication systems may correspond to the same transmission resource, but the content of the transmitted first message is different, and the different content represents the system information requesting different communication systems. For example, the content of the first message is 0, representing that the system information of NR is requested; the content of the first message is 1, which represents that the system information of the LTE is requested; or, the content of the first message is 1, which represents the system information requesting NR, and the content of the first message is 0, which represents the system information requesting LTE.

In case e, the system information of different services may correspond to different transmission resources. For example, transmission resource p corresponds to system information of LTE V2X service, and transmission resource q corresponds to system information of NR V2X service. That is, when requesting system information of an LTE V2X service, a terminal device may send a first message on a transmission resource p; the first message may be transmitted on transmission resource q when NR V2X traffic is requested.

The configuration information in the fourth mode may be configured by the network device for the terminal device, or may be pre-agreed by the terminal device and the network device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application. If the configuration information is configured by the network device, the network device may send the configuration information to the terminal device. Accordingly, the terminal device may receive configuration information from the network device. Further, the configuration information includes a corresponding relationship between a transmission resource for transmitting the first message and the first system information.

It should be noted that, in the fourth mode, the first information is a transmission resource and/or a first message for transmitting the first message. In order to reduce the amount of data transmitted between the terminal device and the network device, the first message may be represented by 1bit, for example, the first message may be 0 and/or 1.

Step 402, the network device sends first system information to the terminal device. Accordingly, the terminal device receives the first system information from the network device.

In this step 402, the network device may send the first system information to the terminal device by means of RRC signaling or by means of broadcast. It can also be understood that the network device may send RRC signaling to the terminal device, where the RRC signaling includes the first system information; alternatively, the network device may broadcast the first system information to the terminal device.

In a possible implementation manner, when the first system information is the first SIB and the network device sends the first system information to the terminal device in a manner of RRC signaling, after the terminal device obtains the first SIB in a manner of receiving RRC signaling, the terminal device may perform any one or more of the following manners a to G.

In the method a, the terminal device stops the first timer corresponding to the first SIB acquired by receiving the broadcast. That is to say, after acquiring the first SIB by means of RRC signaling, the terminal device may stop the first timer of the first SIB acquired by means of receiving broadcast.

In the method B, the terminal device determines that the first timer corresponding to the first SIB acquired by receiving the broadcast is invalid for the first SIB acquired by receiving the RRC signaling. It can also be understood that the first timer corresponding to the first SIB acquired by the terminal device in the broadcast receiving manner is valid only for the first SIB acquired in the broadcast receiving manner, and is invalid for the first SIB acquired in the RRC signaling receiving manner. In a possible implementation manner, all versions of the first SIB acquired in the broadcast receiving manner may be deleted after a first timer corresponding to the first SIB acquired in the broadcast receiving manner expires.

In the mode C, after acquiring the first SIB by receiving the RRC signaling, the terminal device deletes all the stored first SIBs except the first SIB acquired by receiving the RRC signaling. That is, only the first SIB obtained by receiving the RRC signaling is saved, and the versions of the first SIB obtained by the remaining methods are all deleted. For example, if the V2X SIB is obtained by receiving RRC signaling, other versions of the obtained V2X SIB are deleted, and the other versions include the version of the V2X SIB obtained by the terminal device in an idle state or a connected state or an inactive state by receiving a broadcast.

And in the mode D, the terminal equipment acquires the first SIB in a mode of receiving RRC signaling, and deletes all storage versions of the first SIB acquired in a mode of receiving broadcast. In another possible implementation manner, all versions of the first SIB acquired by receiving the broadcast may be deleted immediately after the first SIB is acquired by receiving the RRC signaling.

In the mode E, after the terminal device acquires the first SIB by receiving the RRC signaling, the terminal device starts or restarts the first timer corresponding to the first SIB acquired by receiving the RRC signaling.

In the mode F, when successfully confirming that the first SIB acquired by receiving the RRC signaling is valid, the terminal device starts or restarts the first timer corresponding to the first SIB acquired by receiving the RRC signaling.

In the method G, the terminal device starts or restarts the first timer corresponding to the first SIB when the first SIB is successfully confirmed to be valid.

Based on the above modes a to G, the effective time of the first timer corresponding to the first SIB acquired by receiving the RRC signaling may be 3 hours or other time duration, and is deleted after the expiration.

It should be noted that, if the terminal device acquires the same first SIB twice through RRC signaling, it may be determined that the first SIB received last time is valid, and the first SIB received last time may be deleted or stored, which may be determined by the terminal device itself. In addition, when the terminal device stores the acquired first SIB, the state of the terminal device when the first SIB is acquired also needs to be stored, for example, the terminal device may be in a connected state, an idle state, or an inactive state.

It should be noted that, since the terminal device in the idle state or the inactive state always operates on the BWP with the common search space, the terminal device may acquire the system information by receiving the broadcast. For the terminal device in the connected state, if the terminal device is operating on a BWP configured with a common search space, the terminal device may obtain the system information by receiving a broadcast; if the terminal device is operating on an active BWP not configured with the common search space, the terminal device may obtain the system information by receiving the RRC dedicated signaling. It can also be understood that, if the terminal device operates on an active BWP not configured with the common search space, the terminal device may receive RRC signaling sent by the network device, where the RRC signaling includes system information.

As can be seen from steps 401 to 402, when the terminal device needs the first system information, a first message may be sent to the network device to obtain the first system information.

Further, when there are system information of multiple communication systems or multiple services, the terminal device may request the first system based on the four ways, and may successfully acquire the system information of the first communication system or the system information of the first service.

In this application, the terminal device may trigger sending the first message to the network device when it is determined that the first condition is satisfied. Wherein the first condition may comprise any one or any plurality of the following conditions.

And in the condition 1, the terminal equipment is in a connected state currently.

Conditional 2, the common search space is not configured on the BWP where the terminal device operates, wherein the BWP may be an active BWP. The condition 2 includes any one or more of a search space not configured for random access on the BWP in which the terminal device operates, a search space not configured for SIB1 on the BWP in which the terminal device operates, a search space not configured for other system information (other SI) on the BWP in which the terminal device operates, and a search space not configured for paging on the BWP in which the terminal device operates.

And 3, the terminal equipment has the capability of performing the first service. The first service may be an NR V2X service, an LTE V2X service, an NR V2X mode2 service, or an LTE V2X mode4 service.

The terminal equipment configures the terminal equipment to perform a first service according to the condition 4; or the terminal device receives first indication information of the network device, where the first indication information is used to indicate the terminal device to perform the first service. Specifically, an upper layer (for example, a V2X layer, an NAS layer, or an APP layer) of the terminal device may be configured to perform the first service.

Conditional 5, the terminal device does not store a valid version of the first system information. For example, when the terminal device does not store the valid version of the required V2X SIB, the SUI may be triggered to be sent to the network device based on case ii in the above-described manner three.

And 6, the terminal device receives second indication information of the network device, wherein the second indication information is used for indicating that the network device has the capability of sending the first system information. For example, the terminal device receives SIB1 or MIB transmitted by the network device, where the SIB1 or MIB includes scheduling information of the first system information, which may indicate that the network device has a capability of transmitting the first system information. The SIB1 or the MIB carries the second indication information, or the scheduling information of the SIB1 or the scheduling information of the MIB carries the second indication information.

And in condition 7, the terminal device does not receive configuration information sent by the network device, where the configuration information is used to indicate a sending resource of the first message.

And 8, the terminal device does not receive the resource configuration of the request system information sent by the network device, and/or the mapping relation between the resource configuration of the request system information and the system information. For example, the terminal device receives SIB1 or MIB sent by the network device, the SIB1 or MIB does not include the resource configuration requesting system information, and/or the SIB1 or MIB does not include the mapping relationship between the resource configuration requesting system information and the system information.

And 9, the terminal equipment is in an idle state or an inactive state inactive.

Conditional 10, the common search space is configured on the BWP where the terminal device operates, wherein the BWP may be an initial BWP or an active BWP. The condition 10 includes any one or more of that a search space for random access is configured on the BWP in which the terminal device operates, a search space for SIB1 is configured on the BWP in which the terminal device operates, a search space for other system information (other SI) is configured on the BWP in which the terminal device operates, and a search space for paging is configured on the BWP in which the terminal device operates.

Conditional 11, the terminal device receives configuration information sent by the network device, where the configuration information is used to indicate a sending resource of the first message.

Condition 12: the terminal equipment receives the resource configuration of the request system information sent by the network equipment and/or the mapping relation between the resource configuration of the request system information and the system information. For example, the terminal device receives SIB1 or MIB transmitted by the network device, where the SIB1 or MIB includes resource configuration requesting system information, and/or a mapping relationship between the resource configuration requesting system information and the system information in the SIB1 or MIB.

In a possible implementation manner, the above condition 3, condition 4, condition 5 and condition 6 are necessary conditions for the terminal device to trigger sending the first message to the network device, but these 4 conditions may be implemented as the terminal device and will not be embodied in the protocol. Based on these 4 necessary conditions, when the first condition further includes condition 1 and condition 2 (i.e., the first condition includes condition 1, condition 2, condition 3, condition 4, condition 5, and condition 6), that is, the common search space is not configured on the BWP in which the terminal device operates, the terminal device cannot receive the first system information broadcast by the network device and cannot request the first system information from the network device by means of random access, and at this time, the terminal device may request the first system information from the network device by means of the above-mentioned RRC signaling or MAC signaling or physical layer signaling (e.g., PUCCH). When the first condition further includes condition 9 or condition 10 (i.e., the first condition includes condition 3, condition 4, condition 5, condition 6 and condition 9; or the first condition includes condition 3, condition 4, condition 5, condition 6 and condition 10), that is, the common search space is configured on the BWP in which the terminal device operates, the terminal device may send the first message to the network device by means of random access; further, when the first condition includes condition 3, condition 4, condition 5, condition 6, condition 9, and condition 12, the first message may be MSG1, and when the first condition includes condition 3, condition 4, condition 5, condition 6, condition 10, and condition 12, the first message may be MSG1. When the first condition includes condition 3, condition 4, condition 5, condition 6, condition 8, and condition 10, the first message may be MSG3. When the first condition includes condition 3, condition 4, condition 5, condition 6, condition 8, and condition 9, the first message may be MSG3. When the first condition includes condition 3, condition 4, condition 5, condition 6, and condition 7, the first message may be transmitted by means of random access, MAC signaling, or RRC signaling. When the first condition includes condition 3, condition 4, condition 5, condition 6, and condition 11, the terminal device may transmit the first message to the network device by means of physical layer signaling (e.g., PUCCH) under the first condition.

In another possible implementation, the terminal device may switch to operate on BWP configured with a common search space to achieve the acquisition of the first system information. The application exemplarily presents the following two implementation manners of handover.

In a first implementation, the terminal device may actively switch to work on a BWP configured with a common search space.

In this first implementation, the terminal device sends a first message to the network device, and the terminal device switches to work on BWP configured with the common search space. Or, the terminal device sends eighth indication information to the network device, where the eighth indication information is used to indicate to the network device that: the terminal device will be scheduled to work on BWP configured with a common search space. The terminal device switches to work on BWP configured with the common search space.

Optionally, the terminal device may switch to operate on the BWP configured with the common search space when sending the first message or the eighth indication information to the network device, or after a certain time after sending the first message or the eighth indication information to the network device, or after receiving a response from the network device.

The information with the certain duration may be carried in the first message or the eighth indication information sent by the terminal device to the network device, and is notified to the network device, or may be configured by the network device for the terminal device, or may be predetermined by the terminal device and the network device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application.

In a possible implementation manner, the terminal device may carry information of the BWP configured with the common search space when sending the first message or the eighth indication information to the network device, so as to implement notification of the BWP configured with the common search space to the network device, where the network device may also be configured for the terminal device, may also be pre-agreed by the terminal device and the network device, or may also be determined by the terminal device according to a preset rule, or may also be predefined by a protocol, which is not limited in this application.

In the second implementation manner, the network device schedules the terminal device to work on the BWP configured with the common search space.

In this second implementation, after receiving the first message sent by the terminal device, the network device may schedule the terminal device to work on the BWP configured with the common search space. Alternatively, the terminal device may send eighth indication information to the network device, where the eighth indication information is used to indicate to the network device that: the terminal device requests scheduling to work on a BWP configured with a common search space. After the network device receives the eighth indication information of the terminal device, the network device schedules the terminal device to work on the BWP with the common search space.

In one possible implementation, the terminal device may reacquire the first system information after switching to work on BWP having the common search space. In addition, when the terminal device enters an idle state or an inactive state, the first system information can be acquired again. The previously acquired first system information may be deleted, or may be retained until the corresponding timer expires, which may be determined by the terminal device, which is not limited in this application.

In this application, the terminal device may also send a third message to the network device, where the third message includes third information, and the third information is used to notify the network device that the terminal device does not request the first system information any more (that is, requests the first system information before). After receiving the request (i.e., the third message) that the first system information is no longer needed, the network device does not send the first system information to the terminal device any more.

In this application, the terminal device may trigger sending the third message to the network device when it is determined that the third condition is satisfied. The third condition may include that the terminal device configures that the terminal device does not perform the first service any more, specifically, the upper layer (for example, a V2X layer, an NAS layer, or an APP layer) of the terminal device configures that the terminal device does not perform the first service any more; or the terminal device receives sixth indication information of the network device, where the sixth indication information is used to indicate that the terminal device does not perform the first service any more.

Further, when the terminal device no longer needs the first system information, it may switch to working on a BWP that is not configured with the common search space. The application exemplarily presents the following two implementation manners of handover.

In implementation i, the terminal device may actively switch to work on BWPs that are not configured with a common search space.

In this implementation i, the terminal device sends a third message to the network device, and the terminal device switches to work on BWP that is not configured with the common search space. Or, the terminal device sends ninth indication information to the network device, where the ninth indication information is used to indicate to the network device: the terminal device will be scheduled to work on BWPs that are not configured with a common search space. The terminal device switches to operate on BWP that is not configured with a common search space.

Optionally, the terminal device may switch to the BWP not configured with the common search space to operate when the terminal device sends the third message or the ninth indication information to the network device, or after a certain time after the terminal device sends the third message or the ninth indication information to the network device, or after the terminal device receives a response from the network device.

The information with the certain duration may be carried in a third message or a ninth indication information sent by the terminal device to the network device, and is notified to the network device, or may be configured by the network device for the terminal device, or may be predetermined by the terminal device and the network device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application.

The BWP information that is not configured with the common search space may be carried in a third message or a ninth indication information that is sent by the terminal device to the network device, and is notified to the network device, or the BWP information may be configured by the network device for the terminal device, or may be pre-agreed between the terminal device and the network device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application.

In implementation ii, the network device schedules the terminal device to work on a BWP that is not configured with a common search space.

In this implementation ii, after receiving the third message sent by the terminal device, the network device may schedule the terminal device to operate on a BWP not configured with the common search space. Alternatively, the terminal device may send ninth indication information to the network device, where the ninth indication information is used to indicate to the network device: the terminal device requests scheduling to work on a BWP that is not configured with a common search space. After the network device receives the ninth indication information of the terminal device, the network device schedules the terminal device to work on a BWP without the common search space.

Further, in order to prevent the terminal device from frequently triggering the sending of the third message and/or the first message to the network device, a fifth timer may be set, and during the running of the fifth timer, the terminal device does not send the third message and/or the first message to the network device. The fifth timer is started or restarted after the third message and/or the first message is sent.

In a possible implementation manner, the contents in the foregoing embodiments may be applicable to the embodiment shown in fig. 11, and only the first message in the foregoing embodiments needs to be replaced with the second message, the first message is replaced with the second message, the first system information is replaced with the system information or the required system information or all the system information or the system information that may be required, and the like, the first service is replaced with the second service, the first SIB is replaced with the second SIB, the first SI message is replaced with the second SI message, the first timer is replaced with the second timer, and the like, and corresponding modifications are made, but the technical essence is the same, and details are not described herein.

Fig. 11 shows another communication method provided by the present application. The method comprises the following steps.

Step 1101, the terminal device sends a second message to the network device, where the second message includes second information, and the second information is used to notify the network device that the terminal device needs system information, or used to notify the network device that the terminal device cannot acquire the system information, or used to notify the network device that the terminal device needs to switch BWP, or used to notify the network device that the terminal device will switch BWP. This may be indicated explicitly or implicitly. The second information is also used for indicating the terminal equipment to request the system information or the first system information. Accordingly, the network device receives the second message from the terminal device.

In one possible implementation, the second information may also include any one or more of the following: 1) Information for indicating a first communication system, where the first communication system may be NR, LTE, or the like; 2) Information for indicating a first service, where the first service may be a V2X service, and specifically may be a V2X service of NR or a V2X service of LTE; 3) Information indicating the first SIB, for example, a first SIB number, or a bit map (bit map) indicating the first SIB; 4) Information indicating the first SI message, such as a first SI message number, or a bitmap (bit map) representing the first SI message, etc.

The second information may be configured by the network device, may also be pre-agreed between the network device and the terminal device, or may also be determined by the terminal device according to a preset rule, or may also be predefined by a protocol, which is not limited in this application. In order to save the amount of data transmitted between the terminal device and the network device, the second information may be represented by 0 or 1.

In this step 1101, the network device is notified that the terminal device needs to switch BWP, which may specifically be the network device is notified that the terminal device needs to switch to work on BWP with the common search space. Accordingly, the network device may switch (or be called dispatch) the terminal device to operate on BWP configured with the common search space based on the received second message.

In this step 1101, the network device is informed that the terminal device is to switch BWPs, which may specifically be informing the network device that the terminal device is to switch to work on BWPs with a common search space. Accordingly, the network device may switch (or may be called schedule) the terminal device to operate on the BWP configured with the common search space based on the received second message.

Optionally, the terminal device may switch to operate on the BWP configured with the common search space when sending the second message to the network device, or after a certain time period after sending the second message to the network device, or after receiving a response from the network device.

The information with the certain duration may be carried in a second message sent by the terminal device to the network device, and is notified to the network device, or may be configured for the terminal device by the network device, or may be predetermined by the terminal device and the network device, or may be determined by the terminal device according to a predetermined rule, or may be predefined by a protocol, which is not limited in this application.

The BWP information configured with the common search space may be carried in a second message sent by the terminal device to the network device, and is notified to the network device, or the BWP information may also be configured by the network device for the terminal device, or may also be predetermined by the terminal device and the network device, or may also be determined by the terminal device according to a preset rule, or may also be predefined by a protocol, which is not limited in this application.

The present application exemplarily provides the following four ways for the terminal device to send the second message to the network device.

In mode1, the terminal device sends the second message to the network device through the random access procedure. Accordingly, the network device receives a second message sent by the terminal device through the random access process.

Based on the mode1, the terminal device sends the second message to the network device in the following two cases.

Case 1-1: the second message may be MSG1, and the second information may be a second preamble and/or resource information for transmitting MSG1.

The method specifically comprises the following steps: and the terminal equipment sends MSG1 to the network equipment, wherein the MSG1 comprises the second preamble. Correspondingly, the network equipment receives the MSG1 from the terminal equipment, and can determine that the terminal equipment needs system information according to the second lead code and/or the resource information of the MSG 1; or it may be determined that the terminal device cannot acquire the system information, and further, it may be determined that the terminal device cannot acquire the system information by receiving the broadcast; or determining that the terminal device needs to switch the BWP; or may determine that the terminal device will switch BWP. It should be understood that the network device specifically determines which content is, and the determination is made according to the definition of the second preamble and/or the resource information of the transmitting MSG1. If the second preamble and/or the resource information for transmitting MSG1 are defined to be used for notifying the network device that the terminal device needs the system information, the network device may determine that the terminal device needs the system information according to the second preamble and/or the resource information for transmitting MSG1. If the second preamble and/or the resource information for transmitting the MSG1 is defined to be used to notify the network device that the terminal device cannot acquire the system information, the network device may determine, according to the second preamble and/or the resource information for transmitting the MSG1, that the terminal device cannot acquire the system information, and further, may also determine that the terminal device cannot acquire the system information by receiving a broadcast. If the second preamble and/or the resource information of the MSG1 is defined to be used to notify the network device that the terminal device needs to switch the BWP, the network device may determine that the terminal device needs to switch the BWP according to the second preamble and/or the resource information of the MSG1. If the second preamble and/or the resource information of the MSG1 is defined to notify the network device that the terminal device will switch the BWP, the network device may determine that the terminal device will switch the BWP according to the second preamble and/or the resource information of the MSG1.

It should be noted that specifically, which preamble and/or resource information for sending the MSG1 is set as the second preamble and/or resource information for sending the MSG1 may be configured and notified to the terminal device by the network device (for example, the network device may carry the second preamble and/or resource information for sending the MSG1 in the SIB1 sent to the terminal device), may be agreed in advance between the network device and the terminal device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application. In addition, if the resource information of the second preamble and/or the resource information of the MSG1 are configured by the network device, the network device may be configured to carry the resource information of the second preamble and/or the resource information of the MSG1 in the SIB1 when the network device transmits the SIB1 to the terminal device. Accordingly, after receiving the MSG1 from the terminal device, the network device knows that it is the random access procedure triggered by the terminal device due to the need for system information (or the inability to acquire system information or the need to switch BWP or to switch BWP).

Cases 1-2: the second message may be MSG3 and the second information may be a second field in MSG3.

In a possible implementation manner, MSG3 may carry an RRC message (e.g., an RRC system lnforequest message) for requesting system information, where the RRC message defines a second field, and the second field is used to notify the network device that the terminal device needs system information, or used to notify the network device that the terminal device cannot acquire system information, or used to notify the network device that the terminal device needs to switch BWP, or used to notify the network device that the terminal device will switch BWP.

Based on this case 1-2, two cases, case 1-2-1 and case 1-2-2 can be divided.

Case 1-2-1, the second field is the added field.

In one possible implementation, the second field may be a field newly added in an RRC message (e.g., an RRC system inforequest message) for requesting system information. The second field may be defined as: for notifying the network device that the terminal device needs the system information, or may be defined as for notifying the network device that the terminal device cannot acquire the system information, or may be defined as for notifying the network device that the terminal device needs to switch the partial bandwidth BWP, or may be defined as for notifying the network device that the terminal device will switch the partial bandwidth BWP.

Case 1-2-2, in the RRC message (e.g., RRCSystemInfoRequest message) for requesting system information, for the list for SI request (e.g., a requested-SI-list field in the RRCSystemInfoRequest message), some bit or bits thereof are defined for notifying the network device that the terminal device needs system information, or may be defined for notifying the network device that the terminal device cannot acquire system information, or may be defined for notifying the network device that the terminal device needs to switch the partial bandwidth BWP, or may be defined for notifying the network device that the terminal device will switch the partial bandwidth BWP.

The method specifically comprises the following steps: and the terminal equipment sends MSG3 to the network equipment, wherein the MSG3 comprises a second field. Accordingly, the network device receives MSG3 from the terminal device, and may determine that the terminal device needs system information according to the second field included in MSG3, or determine that the terminal device cannot acquire the system information, or determine that the terminal device needs to switch BWP, or determine that the terminal device will switch BWP. It should be understood that the network device specifically determines which content is, and needs to determine according to the definition of the second field, which can be referred to the above description for the second preamble and/or the resource information for transmitting the MSG1, that is, the resource information for transmitting the MSG1 and/or the second preamble is replaced by the second field, which is not described herein again.

In mode2, the terminal device sends the second message to the network device through MAC signaling. Accordingly, the network device receiving terminal device sends the second message to the network device through the MAC signaling.

In one possible implementation, a MAC CE may be defined that may be defined to notify a network device that a terminal device needs system information, or that may be defined to notify a network device that a terminal device cannot acquire system information, or that may be defined to notify a network device that a terminal device needs to switch BWP, or that may be defined to notify a network device that a terminal device will switch BWP. The terminal device may notify the network device that system information is needed, or notify that system information cannot be acquired, or notify that BWP needs to be switched, or notify that BWP is to be switched, through the RRC signaling.

Illustratively, the MAC signaling includes a MAC PDU including one or more MAC sub-PDUs, the MAC sub-PDU includes a MAC sub-header and a MAC CE, the second information is carried in the MAC CE, and the MAC sub-header includes identification information for indicating the second information carried by the MAC CE. The identification information of the second information may be a logical channel identification LCID, that is, the MAC CE may be identified by using an individual logical channel identification LCID. That is, a row may be added to the value of the logical channel identifier shown in table 1 to identify the value and the index number of the extended MAC CE. For example, the MAC CE may be identified by some index number in a Reserved bit (Reserved) in Table 1. For example, when the LCID is 100010, a MAC CE for notifying the network device that the terminal device needs system information is identified, or a MAC CE for notifying the network device that the terminal device cannot acquire the system information is identified, or a MAC CE for notifying the network device that the terminal device needs to switch the partial bandwidth BWP is identified, or a MAC CE for notifying the network device that the terminal device will switch the partial bandwidth BWP is identified.

Based on the method 2, in a possible implementation manner, a type of the MAC CE may be defined, and the size of the MAC CE may be fixed, 0bit. The MAC CE is identified by a MAC header with an LCID. In another possible implementation manner, as shown in fig. 12a, a schematic structural diagram of another MAC CE provided in the present application is shown. The second information may also indicate a communication system. The MAC CE is variable in size, and a communication system can occupy 2 bits. Of course, the communication system may also occupy more than 2 bits or less than 2 bits, which is not limited in this application. In yet another possible implementation manner, as shown in fig. 12b, a schematic structural diagram of yet another MAC CE provided in the present application is shown. The second information may also indicate traffic. The MAC CE is variable in size, wherein the traffic may occupy 6 bits, or occupy more than 6 bits or less than 6 bits, and fig. 12b only uses 6 bits as an example.

And 3, the terminal equipment sends a second message to the network equipment through RRC signaling. Accordingly, the network device may receive a second message from the terminal device sent by RRC signaling.

Based on this mode3, the following two cases can be divided.

Case 3-1, one RRC signaling is defined.

The RRC signaling may be defined as notifying the network device that the terminal device needs system information, or as notifying the network device that the terminal device cannot acquire system information, or as notifying the network device that the terminal device needs to switch BWP, or as notifying the network device that the terminal device will switch BWP. The terminal device may notify the network device that system information is required, or that system information cannot be acquired, or that BWP needs to be switched, or that BWP is to be switched, through the RRC signaling.

Case 3-2, rrc signaling may include SUI.

This case ii applies to a scenario in which the terminal device is only for V2X services. That is, when the terminal device performs the V2X service, the second message may be sent to the network device through the SUI.

In mode4, the terminal device may send the second message according to the configuration information, where the configuration information is used to indicate a sending resource of the second message. Accordingly, the network device may receive the second message sent by the terminal device according to the configuration information.

In the method 4, the configuration information includes a sending resource for sending the second message, the terminal device may send the second message to the network device according to the sending resource for sending the second message, and after receiving the second message, the network device may determine that the terminal device needs the system information based on the sending resource for sending the second message; or, determining that the terminal device cannot acquire the system information, and further determining that the terminal device cannot acquire the system information in a broadcast receiving manner; or, determining that the terminal device needs to switch the BWP; or, it is determined that the terminal device will switch BWP.

In order to reduce the amount of data transmitted between the terminal device and the network device, the second message may be represented by 1bit, for example, the second message may be 0 and/or 1.

It should be noted that the sending resource for sending the second message may be configured by the network device for the terminal device, may also be pre-agreed by the terminal device and the network device, or may also be determined by the terminal device according to a preset rule, or may also be predefined by a protocol, which is not limited in this application. If the configuration information of the transmission resource for transmitting the second message is configured by the network device, the network device may transmit the configuration information to the terminal device. Accordingly, the terminal device may receive configuration information from the network device.

When the network device receives the second message from the terminal device based on any one of the above-mentioned modes 1 to 4, the network device may switch the terminal device to operate on the active BWP with the common search space. At this time, the terminal device needs to reacquire the necessary system information. Further, the terminal device operates on a BWP without a common search space, and when the terminal device switches to the BWP with the common search space, the terminal device needs to reacquire the required system information.

In addition, when the terminal device enters an idle state or an inactive state, the terminal device acquires the required system information again. Further, the terminal device is in a connected state, and the working BWP configures the common search space, and when the terminal device enters an idle state or an inactive state, the terminal device needs to reacquire the required system information.

Step 1102, the network device sends system information to the terminal device. Accordingly, the terminal device receives system information from the network device.

In this step 1102, the network device may send an RRC signaling to the terminal device, where the RRC signaling includes system information or system information that may be needed by the terminal device or system information that is needed by the terminal device or all the system information; alternatively, the network device broadcasts system information or broadcasts system information that may be needed by the terminal device or broadcasts system information needed by the terminal device or broadcasts all of the system information. It may also be said that the network device may send the system information or the system information that may be needed by the terminal device or the system information that is needed by the terminal device or all the system information to the terminal device by means of RRC signaling or by means of broadcast.

When the system information sent by the network device to the terminal device in the RRC signaling mode is the second SIB, after the terminal device obtains the second SIB in the dedicated signaling receiving mode, the terminal device may perform any one or more of the foregoing modes a to G, and the specific process may refer to the introduction of the foregoing modes a to G. That is, in this embodiment, the first SIB in the foregoing modes a to G may be replaced by the second SIB, and the first timer may be replaced by the second timer, which is not described in detail herein.

As can be seen from the foregoing steps 1101 to 1102, when the terminal device needs system information and cannot currently obtain the system information, the terminal device may notify the network device that the system information is needed or cannot be obtained or BWP is needed or will be switched, and the network device may schedule the terminal device onto the BWP having the common search space based on the notification of the terminal device, or send the system information or the system information that the terminal device may need or the system information that the terminal device needs or all the system information to the terminal device through RRC signaling, so that the terminal device can successfully obtain the needed system information.

In this application, the terminal device may trigger sending the second message to the network device when it is determined that the second condition is satisfied. Wherein the second condition may comprise any one or any plurality of the following conditions.

And in the condition A, the terminal equipment is in a connection state currently.

Conditional B, the common search space is not configured on the BWP where the terminal device operates, wherein the BWP may be an active BWP. The condition B may specifically be any one or more of a search space that is not configured for random access on the BWP in which the terminal device operates, a search space that is not configured for SIB1 on the BWP in which the terminal device operates, a search space that is not configured for other system information (other SI) on the BWP in which the terminal device operates, and a search space that is not configured for paging on the BWP in which the terminal device operates.

And the terminal equipment has the capability of performing a second service under the condition C, wherein the second service can be NR V2X service or LTE V2X service or NR V2X mode2 service or LTE V2X mode4 service.

And C, configuring the terminal equipment to perform a second service by the terminal equipment under the condition D. Specifically, the upper layer (for example, a V2X layer, an NAS layer, or an APP layer) of the terminal device configures the second service; or the terminal device receives fourth indication information of the network device, where the fourth indication information is used to indicate the terminal device to perform the second service.

And the condition E is that the terminal equipment does not store the effective version of the required system information, wherein the required system information is the system information required for carrying out the second service.

And the terminal equipment receives fifth indication information of the network equipment, wherein the fifth indication information is used for indicating that the network equipment has the capability of sending the required system information. For example, the terminal device receives SIB1 or MIB transmitted by the network device, where the SIB1 or MIB includes scheduling information of the required system information and indicates that the network device has a capability of transmitting the required system information. In a possible implementation manner, the SIB1 or the MIB carries the fifth indication information, or the scheduling information of the SIB1 or the scheduling information of the MIB carries the fifth indication information.

And the condition G is that the terminal equipment does not receive configuration information sent by the network equipment, wherein the configuration information is used for indicating sending resources of the second message.

Condition H: the terminal device does not receive the resource configuration of the request system information sent by the network device and/or the mapping relation between the resource configuration of the request system information and the system information. For example, the terminal device receives SIB1 or MIB sent by the network device, the SIB1 or MIB does not include the resource configuration requesting system information, and/or the SIB1 or MIB does not include the mapping relationship between the resource configuration requesting system information and the system information.

And in the condition I, the terminal equipment is in an idle state or an inactive state.

Conditional J, the BWP on which the terminal device operates is configured with a common search space, wherein the BWP may be an initial BWP or an active BWP. The condition J includes any one or more of that a search space for random access is configured on the BWP in which the terminal device operates, that a search space for SIB1 is configured on the BWP in which the terminal device operates, that a search space for other system information (other SI) is configured on the BWP in which the terminal device operates, and that a search space for paging is configured on the BWP in which the terminal device operates.

And under the condition K, the terminal equipment receives configuration information sent by the network equipment, wherein the configuration information is used for indicating the sending resource of the first message.

Condition L: the terminal equipment receives the resource configuration of the request system information sent by the network equipment, and/or the terminal equipment receives the mapping relation between the resource configuration of the request system information sent by the network equipment and the system information. For example, the terminal device receives SIB1 or MIB transmitted by the network device, where the SIB1 or MIB includes resource configuration requesting system information, and/or a mapping relationship between the resource configuration requesting system information and the system information in the SIB1 or MIB.

In a possible implementation manner, the condition C, the condition D, the condition E, and the condition F are necessary conditions for the terminal device to trigger sending the second message to the network device, but these four conditions may be implemented as the terminal device and are not embodied in the protocol. Based on these four requirements, when the second condition further includes condition a and condition B (i.e. the second condition includes condition a, condition B, condition C, condition D, condition E and condition F), that is, the common search space is not configured on the BWP in which the terminal device operates, the terminal device cannot receive the second system information broadcast by the network device and cannot request the second system information from the network device by means of random access, and at this time, the terminal device may request the second system information from the network device by means of the above-mentioned RRC signaling or MAC signaling or physical layer signaling (e.g. PUCCH). When the second condition further includes condition I or condition J (i.e., the second condition includes condition C, condition D, condition E, condition F and condition I; or the second condition includes condition C, condition D, condition E, condition F and condition J), that is, the BWP in which the terminal device operates is configured with the common search space, the terminal device may send the second message to the network device by means of random access under the second condition; further, when the second condition includes condition C, condition D, condition E, condition F, condition I, and condition L, the second message may be MSG1, and when the second condition includes condition C, condition D, condition E, condition F, condition J, and condition L, the second message may be MSG1. When the second condition includes condition C, condition D, condition E, condition F, condition H, and condition J, the second message may be MSG3. When the second condition includes condition C, condition D, condition E, condition F, condition H, and condition I, the second message may be MSG3. When the second condition includes condition C, condition D, condition E, condition F and condition G, the second message may be sent by means of random access, MAC signaling or RRC signaling. When the second condition includes condition C, condition D, condition E, condition F, and condition K, the terminal device may transmit the second message to the network device by means of physical layer signaling (e.g., PUCCH) under the second condition.

Accordingly, upon receiving the second message from the terminal device, the network device may, in one possible implementation, schedule the terminal device on BWP having the common search space based on the second message.

In another possible implementation, the terminal device may switch to operate on BWP configured with a common search space to achieve the acquisition of system information. The application exemplarily gives the following two implementation manners of handover.

Implementation 1, the terminal device may actively switch to work on BWP configured with a common search space.

In this implementation 1, the terminal device sends a second message to the network device, and the terminal device switches to work on BWP configured with the common search space. Or, the terminal device sends tenth indication information to the network device, where the tenth indication information is used to indicate to the network device that: the terminal device will be scheduled to work on a BWP configured with a common search space. The terminal device switches to work on BWP configured with a common search space.

Optionally, the terminal device may switch to operate on the BWP configured with the common search space when sending the second message or the tenth indication information to the network device, or after a certain time after sending the second message or the tenth indication information to the network device, or after receiving a response from the network device.

The information with the certain duration may be carried in a second message sent by the terminal device to the network device, and is notified to the network device, or may be configured by the network device for the terminal device, or may be predetermined by the terminal device and the network device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application.

Implementation 2, the network device schedules the terminal device to work on BWP configured with a common search space.

In this implementation 2, after receiving the second message sent by the terminal device, the network device may schedule the terminal device to work on the BWP configured with the common search space. Alternatively, the terminal device may send tenth instruction information to the network device, where the tenth instruction information is used to instruct the network device to: the terminal device requests scheduling to work on a BWP configured with a common search space. After the network device receives the tenth indication information of the terminal device, the network device schedules the terminal device to work on the BWP with the common search space.

In this application, the terminal device may also send a fourth message to the network device, where the fourth message includes fourth information, and the fourth information is used to notify the network device that the terminal device does not need system information any more. After receiving the request that the system information is no longer needed (fourth message), the network device does not send the system information to the terminal device.

In this application, the terminal device may trigger sending the fourth message to the network device when it is determined that the fourth condition is satisfied. The fourth condition may include that the terminal device configures that the terminal device does not perform the second service any more; performing a second service as configured by an upper layer (e.g., a V2X layer, or an NAS layer, or an APP layer) of the terminal device; or the terminal device receives seventh indication information of the network device, where the seventh indication information is used to indicate that the terminal device does not perform the second service any more.

Further, the terminal device may switch to operate on BWP that is not configured with a common search space. The application exemplarily presents the following two implementation manners of handover.

Implementation a, the terminal device may actively switch to work on BWP that is not configured with a common search space.

In this implementation a, the terminal device may send a fourth message to the network device, and the terminal device switches to work on BWP that is not configured with the common search space. Or, the terminal device sends fourteenth indication information to the network device, where the fourteenth indication information is used to indicate to the network device that: the terminal device will be scheduled to work on BWPs that are not configured with a common search space. The terminal device switches to operate on BWP that is not configured with a common search space.

Optionally, the terminal device may switch to the BWP not configured with the common search space to operate when the terminal device sends the fourth message or the fourteenth indication information to the network device, or after a certain time after the terminal device sends the fourth message or the fourteenth indication information to the network device, or after the terminal device receives a response from the network device.

The information with the certain duration may be carried in a fourth message or fourteenth indication information sent by the terminal device to the network device, and is notified to the network device, or may be configured for the terminal device by the network device, or may be predetermined by the terminal device and the network device, or may be determined by the terminal device according to a preset rule, or may be predefined by a protocol, which is not limited in this application.

The BWP not configured with the common search space may be carried in a fourth message or fourteenth indication information sent by the terminal device to the network device, and is notified to the network device, or the BWP is configured for the terminal device by the network device, or the BWP is pre-agreed between the terminal device and the network device, or the BWP is determined by the terminal device according to a preset rule, or the BWP is pre-agreed with a protocol, which is not limited in this application.

Implementation b, the network device schedules the terminal device to work on a BWP that is not configured with a common search space.

In this implementation b, after receiving the fourth message sent by the terminal device, the network device may schedule the terminal device to work on a BWP not configured with the common search space. Alternatively, the terminal device may send fourteenth indication information to the network device, where the fourteenth indication information is used to indicate to the network device: the terminal device requests scheduling to work on a BWP that is not configured with a common search space. After the network device receives the fourteenth indication information of the terminal device, the network device schedules the terminal device to work on a BWP without the common search space.

Further, in order to prevent the terminal device from frequently triggering the sending of the second message and/or the fourth message to the network device, a fourth timer may be set, and during the running of the fourth timer, the terminal device does not send the second message and/or the fourth message to the network device. The fourth timer may be started or restarted after the second message and/or the fourth message is sent.

As shown in fig. 13, another communication method provided by the present application includes the following steps:

step 1301, the network device maps the SIBs of at least two different communication systems to the same SI message.

In this step 1301, system information of at least two different communication systems is involved. Illustratively, taking two communication systems (e.g., NR and LTE as examples), the SIB for NR and the SIB for LTE may be mapped in the same SI message. Alternatively, the SIB for NR V2X and the SIB for lte V2X may be mapped in the same SI message.

This 1301 step is optional.

Step 1302, the network device sends third indication information to the terminal device, where the third indication information is used to indicate the size of the system information block SIB with different communication schemes, for example, the third indication information is used to indicate the size (bit number or code stream length, etc.) of the system information block SIB with different communication schemes in the SI message. Accordingly, the terminal device receives the third indication information from the network device.

Here, the size of the SIB may be understood as the length of the code stream occupied by the SIB. The size of the SIB in the SI message may also be understood as the length of the code stream occupied by the SIB in the SI message.

In step 1303, the terminal device may decode, according to the third indication information, an SIB of the communication system supported by the terminal device.

Further, optionally, the terminal device may ignore (may also be referred to as skipping) the SIB of the communication scheme that is not supported by the terminal device, and directly decode the SIB of the supported communication scheme.

For example, when the network device maps the SIB of NR and the SIB of LTE into the same SI message, terminal device a supports NR, terminal device B supports LTE, and after the network device sends the SI message to both terminal device a and terminal device B, terminal device a may determine the size of the SIB of NR and the size of the SIB of LTE according to the third indication information, and since terminal device a cannot decode the SIB of LTE, the SIB of LTE may be ignored (or skipped) according to the size of the SIB of LTE, so that the SIB of NR may be successfully decoded. Likewise, the terminal device B may determine the size of the SIB for NR and the size of the SIB for LTE according to the third indication information, respectively, and may ignore (or skip) the SIB for NR according to the size of the SIB for NR since the terminal device B cannot decode the SIB for NR, so that the SIB for LTE may be successfully decoded.

As can be seen from the foregoing steps 1301 to 1303, the terminal device may skip or ignore the SIB of the communication scheme that is not supported by the terminal device (or the SIB code stream of the communication scheme that is not supported by the terminal device), so that the SIB of the communication scheme that is supported by the terminal device may be successfully decoded.

In a possible implementation manner, the communication method shown in fig. 4 or fig. 11 may be combined with the communication method shown in fig. 13, so that when the SI message received by the terminal device includes both the SIB of the communication system that is not supported by the terminal device and the SIB of the communication system that is supported by the terminal device, the SIB of the communication system that is supported by the terminal device may also be successfully decoded.

In the following description, the SIB for each communication scheme may include one SIB or may include a plurality of SIBs. For example, the SIB for the third communication scheme may include one SIB or may include a plurality of SIBs. Similarly, the SIB of the fourth communication scheme may also include one SIB and may also include a plurality of SIBs. Further, the SIB for each communication scheme may be mapped to one SI message, or may be mapped to multiple SI messages. For example, the SIB of the third communication scheme includes multiple SIBs, and the multiple SIBs of the third communication scheme may be mapped to one SI message or may be mapped to multiple SI messages. For another example, if the SIB of the third communication scheme includes one SIB, the SIB of the third communication scheme is mapped to one SI message, which is not limited in this application. As follows, for convenience of description of the scheme, the SIB for each communication scheme is exemplified to include one SIB.

Fig. 14 is a schematic flow chart illustrating still another communication method of the present application. The method comprises the following steps:

in step 1401, the network device maps SIBs of different communication systems into different SI messages.

As described below by taking the third communication system and the fourth communication system as examples, the network device may map the SIB of the third communication system and the SIB of the fourth communication system into different SI messages. The third communication system is NR, and the fourth communication system is LTE. The SIB for NR may be mapped into one SI message and the SIB for LTE may be mapped into another SI message. That is, the SIBs of NR and the SIBs of LTE are not mapped into the same SI message.

In the present application, the present application is not limited to the case of being applied to only two communication systems, and the contents of the present application may also be applied to the case of multiple communication systems. In addition, the third communication system and the fourth communication system may also be other communication systems appearing in the future, which is not limited in the present application.

Further, optionally, the SIB for NR includes a SIB for NR V2X and a SIB for NR other than the SIB for NR V2X, and the SIB for LTE includes a SIB for LTE V2X and a SIB for LTE V2X other than the SIB for LTE V2X, wherein the SIB for NR other than the SIB for NR V2X may also be referred to as a SIB for general NR, and the SIB for LTE V2X other than the SIB for LTE V2X may also be referred to as a SIB for general LTE V2X. Six implementations of mapping the SIBs of NR to different SI messages with the SIBs of LTE are given below.

In implementation a, the network device maps the SIB for NR and the SIB for LTE V2X into different SI messages. That is, the network device may map the SIB for NR into one SI message and may map the SIB for LTE V2X into another SI message.

In implementation B, the network device maps the SIB for NR V2X and the SIB for LTE into different SI messages. It may also be appreciated that the network device may map the SIB for NR V2X into one SI message and may map the SIB for LTE into another SI message.

In implementation C, the network device maps the SIB for NR V2X and the SIB for LTE V2X into different SI messages. It may also be appreciated that the network device may map the SIB for NR V2X into one SI message and may map the SIB for LTE V2X into another SI message.

In implementation D, the network device maps the SIB for NR V2X, the SIBs for NR other than the SIB for NR V2X, and the SIB for LTE V2X into different SI messages, respectively. It may also be appreciated that the network device may map the SIB for NR V2X into one SI message, may map the SIB for LTE V2X into another SI message, and map the SIBs for NR other than the SIB for NR V2X into one SI message that is different from the previous one in implementation D.

In implementation E, the network device maps the SIB for LTE V2X, the SIB for LTE V2X other than the SIB for LTE V2X, and the SIB for NR to different SI messages, respectively. It can also be understood that the network device may map SIBs of LTE V2X into one SI message, may map SIBs of NR into another SI message, and may separately map SIBs of LTE V2X other than SIBs of LTE V2X into one SI message that is different from the previous one in implementation E.

In implementation F, the network device maps the SIB for LTE V2X, the SIB for LTE V2X other than the SIB for LTE V2X, the SIB for NR V2X, and the SIB for NR other than the SIB for NR V2X into different SI messages, respectively. It may also be understood that the network device may map SIBs of LTE V2X into one SI message, may map SIBs of LTE V2X other than the SIBs of LTE V2X into one SI message different from all previous ones in implementation F, may map SIBs of NR V2X into one SI message different from all previous ones in implementation F, and may map SIBs of NR other than the SIBs of NR V2X into one SI message different from all previous ones in implementation F.

In step 1402, the network device sends an SI message to the terminal device. Accordingly, the terminal device receives the SI message.

In this step 1402, the network device may send one of the mapped different SI messages to the terminal device, may send some of the mapped different SI messages to the terminal device, or may send all of the mapped different SI messages to the terminal device. For example, if multiple terminal devices request the same SI message, the network device may set the SI message to be broadcast all the time.

As can be seen from step 1401 and step 1402, by mapping SIBs of different communication systems into different SI messages, a limitation is added to the mapping relationship between the SIBs and the SI messages. Therefore, the terminal equipment which only supports a certain communication system can successfully decode the received SI message. Further, the terminal device does not need to receive the SI message mapped by the communication system that is not supported by the terminal device.

In one possible implementation, the communication method shown in fig. 14 may be combined with the communication method shown in fig. 4 or fig. 11. When the communication method shown in fig. 4 is combined with the communication method shown in fig. 14, the structure of the MAC CE shown in fig. 6e may not be needed when the terminal device requests the network device for the first system information in the third embodiment shown in fig. 4. That is, the MAC CE shown in fig. 6e may be in a case where the network device does not define that SIBs of different communication systems are mapped to different SI messages, and the terminal device may additionally indicate information of the communication systems or V2X service information to the network device.

In this application, the network device may also map SIBs of different services to different SI messages.

Wherein, the different services may include: V2X traffic and traffic other than V2X, etc.

In the first example, a communication system is taken as an example. For example, the communication scheme is NR, the service of NR includes NR V2X service and service except NR V2X service, the SIB of NR includes SIB of NR V2X and SIB of NR V2X except SIB of NR V2X, and the network device may map the SIB of NR V2X and the SIB of NR except SIB of NR V2X into different SI messages. For another example, the communication system is LTE, the service of LTE includes LTE V2X service and services other than LTE V2X, the SIB of LTE includes an SIB of LTE V2X and an SIB of LTE V2X other than the SIB of LTE V2X, and the network device may map the SIB of LTE V2X and the SIB of LTE V2X other than the SIB of LTE V2X into different SI messages.

In the second example, two communication systems are taken as an example. For example, the two communication systems are NR and LTE, and the services in the two communication systems include a V2X service and a service other than V2X, the network device may map the SIB for LTE V2X and/or the SIB for NR V2X into one SI message, and map the SIB for V2X into another SI message.

It should be noted that the method is also applicable to more than two communication systems, and the specific mapping process may refer to the mapping of the two communication systems in the second example, which is not described herein again.

In the application, the network device may actively send the second system information to the terminal device. Specifically, the second system information may be sent to the terminal device through RRC signaling.

In a possible implementation manner, the network device may actively send the second system information to the terminal device when determining that the third timer is overtime, where the third timer is a timer that is maintained by the network device for the terminal device and is associated with the second system information. For example, the network device sends the second system information to the terminal device a, and the network device may maintain a third timer a for the second system information of the terminal device a; for another example, the network device sends the second system information to the terminal device B, and the network device may maintain a third timer B for the second system information of the terminal device B.

In one possible implementation manner, the second system information may be determined by the network device according to the terminal device capability information and/or the service information. Illustratively, the network device may determine the second system information according to whether the terminal device triggers a certain service, is performing a certain service, has previously performed a certain service, or has the capability of performing a certain service.

The network device may start or restart the third timer before sending the second system information to the terminal device through the RRC signaling, when sending the second system information to the terminal device through the RRC signaling, or after sending the second system information to the terminal device through the RRC signaling.

In one possible implementation, the network device may maintain a third timer for each terminal device, and when the network device determines that the terminal device enters or is in a connected state (the terminal device operates on a BWP not configured with the common search space), the network device sends the second system information (including all SIBs that may be needed) to the terminal device by means of RRC signaling, and starts or restarts the third timer maintained for the terminal device. Further, if the second system information is not changed, after the third timer expires, the network device sends the second system information (including all possibly required SIBs) to the terminal device again in an RRC signaling manner. If the network device can send the second system information (including all SIBs that may be needed) to the terminal device through RRC signaling if the second system information is determined to change within the time duration set by the third timer, and start or restart the third timer.

In another possible implementation, the network device may maintain multiple timers for each terminal device. For example, one third timer may be maintained for each type of second system information (including one or more SI messages or one or more SIBs) or for each second system information (including one or more SI messages or one or more SIBs) of one terminal device. Similarly, if the second system information is not changed, after the third timer expires, the network device sends a certain type or a certain kind of second system information corresponding to the third timer to the terminal device again in an RRC signaling manner. If the second system information is changed within the time length set by the timer, the network equipment sends one or a certain type of second system information with the changed system information to the terminal equipment in an RRC signaling mode, and starts or restarts the third timer; or, the network device sends the changed system information to the terminal device in an RRC signaling manner. For example, if the second system information includes multiple SIBs, and one SIB is changed, the network device may send the second system information to the terminal device, and start or restart the third timer; or, sending the changed SIB.

It should be noted that the set duration of the third timer may be 3 hours or another value, and in a case that the second system information is not changed, the network device may send the second system information to the terminal device every 3 hours (the duration of the third timer).

In this application, the terminal device may acquire the V2X SIB by receiving a broadcast or a dedicated signaling, but if the V2X SIB does not include a resource pool (resource pool) or a resource pool for reception or some other configuration information, the terminal device may not perform sidelink communication in the second mode by using the V2X SIB, and the terminal device may perform sidelink communication in the second mode by using the preconfigured information. However, for the terminal device, power is consumed to acquire the system information, and a certain time delay may be caused. If the terminal device can know whether the V2X SIB includes the configuration information necessary for V2X communication before acquiring the V2X SIB, the terminal device can determine whether to acquire the V2X-related system information in advance.

In view of the above problem, in the present application, the network device may send eleventh indication information to the terminal device, where the eleventh indication information is used to indicate whether a sidelink resource pool (SL resource pool) configuration is carried in the V2X-related system information (e.g., V2X SIB), for example, add an indication whether a sidelink resource pool (SL resource pool) configuration is carried in the V2X-related system information (e.g., V2X SIB) in SIB1 or MIB, where the SL resource pool configuration may be a SL transmission resource pool configuration, or a SL reception resource pool configuration, or a SL transmission and reception resource pool configuration. Wherein, the V2X SIB refers to a SIB that can carry SL transmission resource pool configuration and/or reception resource pool configuration.

In this application, if the terminal device is triggered to perform the V2X service, the terminal device is about to perform sidelink communication in the second mode (e.g., perform sidelink transmission in the second mode), and the terminal device may acquire system information related to V2X (e.g., V2X SIB) in a broadcast receiving manner or an RRC signaling receiving manner (also may be understood as that the terminal device may receive an RRC signaling sent by the network device, where the RRC signaling includes the system information related to V2X, or the terminal device may receive the system information related to V2X broadcast by the network device), or send a sixth message to the network device, where the sixth message is used to request the system information related to V2X (e.g., V2X SIB).

In this application, when it is determined that the fifth condition is satisfied, the terminal device may acquire system information related to V2X (e.g., V2X SIB) in a broadcast receiving manner or an RRC signaling receiving manner; or the terminal device sends a sixth message to the network device, where the sixth message is used to request V2X-related system information (e.g., V2X SIB). Wherein the fifth condition may comprise any one or any plurality of the following conditions.

And a condition a, the terminal equipment is in a connection state currently.

Conditional b, the common search space is not configured on the BWP where the terminal device operates, wherein the BWP may be an active BWP. The condition b includes any one or more of a search space not configured for random access on the BWP in which the terminal device operates, a search space not configured for SIB1 on the BWP in which the terminal device operates, a search space not configured for other system information (other SI) on the BWP in which the terminal device operates, and a search space not configured for paging on the BWP in which the terminal device operates.

And c, the terminal equipment has the capability of performing the V2X service. The V2X service may be an NR V2X service, an LTE V2X service, an NR V2X mode2 service, or an LTE V2X mode4 service.

And d, the terminal equipment configures the terminal equipment to perform the V2X service. Specifically, an upper layer (for example, a V2X layer, or an NAS layer, or an APP layer) of the terminal device may be configured to perform a V2X service; or, the terminal device receives thirteenth indication information of the network device, where the thirteenth indication information is used to indicate the terminal device to perform the V2X service.

Condition e, the terminal device does not store a valid version of the V2X-related system information. For example, when the terminal device does not store a valid version of the required V2X SIB.

And f, the terminal device receives twelfth indication information of the network device, wherein the twelfth indication information is used for indicating that the network device has the capability of sending the V2X related system information. For example, the terminal device receives SIB1 or MIB transmitted by the network device, where the SIB1 or MIB includes scheduling information of V2X-related system information and represents that the network device has the capability of transmitting V2X-related system information. The SIB1 or the MIB carries the twelfth indication information, or the scheduling information of the SIB1 or the scheduling information of the MIB carries the twelfth indication information.

And the condition g is that the terminal device does not receive configuration information sent by the network device, wherein the configuration information is used for indicating the sending resource of the sixth message.

The condition h is as follows: the terminal device does not receive the resource configuration of the request system information sent by the network device and/or the mapping relation between the resource configuration of the request system information and the system information. For example, the terminal device receives SIB1 or MIB transmitted by the network device, the SIB1 or MIB does not include resource configuration requesting system information, and/or the SIB1 or MIB does not include mapping relationship between resource configuration requesting system information and system information.

And under the condition i, the terminal equipment is in an idle state or an inactive state.

Conditional j, the BWP on which the terminal device operates is configured with a common search space, wherein the BWP may be an initial BWP or an active BWP. The condition h includes any one or more of that a search space for random access is configured on the BWP in which the terminal device operates, a search space for SIB1 is configured on the BWP in which the terminal device operates, a search space for other system information (other SI) is configured on the BWP in which the terminal device operates, and a search space for paging is configured on the BWP in which the terminal device operates.

And in the condition k, the terminal device receives configuration information sent by the network device, wherein the configuration information is used for indicating the sending resource of the sixth message.

Condition l: the terminal equipment receives the resource configuration of the request system information sent by the network equipment and/or the mapping relation between the resource configuration of the request system information and the system information. For example, the terminal device receives SIB1 or MIB sent by the network device, where the SIB1 or MIB includes resource configuration requesting system information, and/or a mapping relationship between the resource configuration requesting system information and the system information in the SIB1 or MIB.

In a possible implementation manner, when the terminal device needs to request the V2X-related system information, the request may be made through the contents in the embodiments described in fig. 4 and fig. 11.

In a possible implementation manner, the condition c, the condition d, the condition e, and the condition f are necessary conditions for the terminal device to trigger sending the second message to the network device, but these four conditions may be implemented as the terminal device and are not embodied in the protocol.

In a possible implementation, when the fifth condition further includes condition a and condition b (i.e., the fifth condition includes condition c, condition d, condition e, condition f, condition a and condition b, i.e., the common search space is not configured on the BWP in which the terminal device operates), under which the terminal device cannot receive V2X-related system information (e.g., V2X SIB) broadcast by the network device, and cannot request V2X-related system information (e.g., V2 XSIB) from the network device by means of random access, the terminal device may request V2X-related system information from the network device by means of the above-mentioned RRC signaling or MAC signaling or physical layer signaling (e.g., PUCCH); further, when the fifth condition includes a condition i and a condition l, the sixth message may be MSG1, when the fifth condition includes a condition j and a condition l, the first message may be MSG1, when the fifth condition includes a condition h and a condition j, the first message may be MSG3, when the fifth condition includes a condition h and a condition i, the first message may be MSG3, when the fifth condition includes a condition g, the first message may be transmitted by means of random access, MAC signaling, or RRC signaling, when the fifth condition includes a condition k, under which the terminal device may transmit the first message by means of physical layer signaling (for example, PUCCH) to transmit the sixth message to the network device.

Based on the above and the same idea, the present application provides a communication apparatus for executing any one of the schemes on the terminal device side in the above method flow. Fig. 15 is a schematic structural diagram illustrating a communication device provided in the present application. The communication apparatus in this example may be, for example, the terminal device 1500. The terminal device 1500 includes a processor 1500 and a transceiver 1502. Optionally, a memory 1503 may also be included. The terminal device 1500 may also be the terminal device 302 of fig. 3 described above.

In one possible implementation, processor 1501 and memory 1503 may be integrated together, or processor 1501 and memory 1503 may be coupled via an interface; alternatively, the processor 1501 is a hardware chip, and the memory 1503 is external to the chip, which is not limited in this application.

It should be noted that fig. 15 only shows a simplified design of the network device. In practical applications, the terminal device may include any number of processors, memories, transceivers, etc., and all network devices that can implement the present application are within the scope of the present application.

In a first application, the terminal device 1500 may be configured to execute the scheme of the terminal device side in fig. 4, where the terminal device 1500 may include:

the transceiver 1502 and the processor 1501 cooperate to send a first message to the network device and receive first system information from the network device, the first message including first information indicating that the terminal device requests the first system information.

In one possible implementation, the first information includes any one or any multiple of information indicating the first communication system, information indicating the first service, information indicating the first system information block SIB, and information indicating the first SI message.

The processor 1501 may be specifically configured to determine that a first condition is satisfied, where the first condition includes any one or more of: the terminal equipment is in a connection state at present; the BWP where the terminal device works is not configured with the common search space or the BWP where the terminal device works is configured with the common search space; the terminal equipment has the capability of carrying out the first service; the terminal equipment configures the terminal equipment to perform a first service or receives first indication information of the network equipment, wherein the first indication information is used for indicating the terminal equipment to perform the first service; the terminal device does not store the effective version of the first system information; the terminal equipment receives second indication information of the network equipment, wherein the second indication information is used for indicating that the network equipment has the capability of sending the first system information; the terminal equipment is in an idle state or an inactive state; the terminal equipment receives or does not receive configuration information sent by the network equipment, wherein the configuration information is used for indicating sending resources of the first message; the terminal equipment receives the resource configuration of the request system information sent by the network equipment, and/or the terminal equipment receives the mapping relation between the resource configuration of the request system information sent by the network equipment and the system information; the terminal equipment does not receive the resource configuration of the request system information sent by the network equipment, and/or the mapping relation between the resource configuration of the request system information and the system information sent by the network equipment is not received by the terminal equipment.

The processor 1501 may be specifically configured to switch to work on BWP configured with a common search space.

The transceiver 1502 and the processor 1501 cooperate to specifically transmit a first message to a network device via a random access procedure. In a possible implementation manner, the first message is MSG1, the first information is a first preamble and/or resource information of transmitting MSG1, and the first preamble and/or resource information of transmitting MSG1 correspond to at least one system information of the first communication system. In another possible implementation manner, the first message is MSG3, and the first information is a first field in MSG3.

The transceiver 1502 and the processor 1501 cooperate, and are further configured to receive a mapping relationship between the first preamble transmitted from the network device and/or the resource information of the MSG1 and at least one system information of the first communication format.

The transceiver 1502 and the processor 1501 cooperate, and in particular, are configured to send a first message to a network device via media access control, MAC, signaling; the MAC signaling comprises a MAC PDU, the MAC PDU comprises one or more MAC sub-PDUs, each MAC sub-PDU comprises a MAC sub-head and a MAC CE, first information is carried in the MAC CE, and the MAC sub-head comprises identification information used for indicating the first information carried by the MAC CE.

The transceiver 1502 and the processor 1501 in cooperation may be specifically configured to send a first message to a network device via RRC signaling.

In one possible implementation, the RRC signaling may include SUI.

The transceiver 1502 and the processor 1501 cooperate, and are specifically configured to transmit the first message according to configuration information, where the configuration information is used to indicate a transmission resource of the first message, and the transmission resource corresponds to the first system information.

The transceiver 1502, in cooperation with the processor 1501, may also be configured to receive configuration information from a network device.

The processor 1501, in cooperation with the transceiver 1502, may be further configured to determine that the terminal device enters an idle state or an inactive state, or switches to operate on a BWP with a common search space, and reacquires the first system information.

The transceiver 1502 and the processor 1501 cooperate, and are further configured to receive an RRC signaling sent by a network device, where the RRC signaling includes first system information; or, the method can also be used for receiving the first system information broadcast by the network equipment.

In a possible implementation manner, the first system information is a first SIB, and the processor 1501 is specifically configured to stop a first timer corresponding to the first SIB acquired in a broadcast receiving manner; or determining that a first timer corresponding to a first SIB acquired by receiving a broadcast is invalid for the first SIB acquired by receiving an RRC signaling; or after the first SIB is acquired by receiving the RRC signaling, deleting all stored first SIBs except the first SIB acquired by receiving the RRC signaling; or, acquiring the first SIB in a mode of receiving RRC signaling, and deleting all storage versions of the first SIB acquired in a mode of receiving broadcast; or after the first SIB is acquired by receiving the RRC signaling, starting or restarting a first timer corresponding to the first SIB acquired by receiving the RRC signaling; or when the first SIB acquired by receiving the RRC signaling is successfully confirmed to be valid, starting or restarting a first timer corresponding to the first SIB acquired by receiving the RRC signaling; or, starting or restarting the first timer corresponding to the first SIB when the first SIB is successfully confirmed to be valid.

In a second application, the terminal device 1500 may execute the scheme correspondingly executed by the terminal device in fig. 11. As shown in fig. 15, the terminal apparatus 1500 includes:

the transceiver 1502 and the processor 1501 cooperate to transmit a second message to the network device, receive the first system information from the network device, the second message including second information for notifying the network device that the terminal device needs the system information, or for notifying the network device that the terminal device cannot acquire the system information, or for notifying the network device that the terminal device needs to switch the partial bandwidth BWP.

In one possible implementation, the processor 1501 is specifically configured to determine that a second condition is satisfied, where the second condition includes: the terminal equipment is currently in a connected state; the BWP where the terminal device works is not configured with the public search space or the BWP where the terminal device works is configured with the public search space; the terminal equipment has the capability of carrying out the second service; the terminal equipment configures the terminal equipment to perform a second service; the terminal equipment receives fourth indication information of the network equipment, wherein the fourth indication information is used for indicating the terminal equipment to carry out a second service; the terminal device does not store the effective version of the required system information, wherein the required system information is the system information required by the second service; the terminal equipment receives fifth indication information of the network equipment, wherein the fifth indication information is used for indicating that the network equipment has the capability of sending required system information; the terminal equipment is in an idle state or an inactive state; the terminal equipment receives or does not receive configuration information sent by the network equipment, wherein the configuration information is used for indicating sending resources of the second message; the terminal equipment receives the resource configuration of the request system information sent by the network equipment and/or the mapping relation between the resource configuration of the request system information sent by the network equipment and the system information; the terminal equipment does not receive any one or more of the resource configuration of the request system information sent by the network equipment and/or the mapping relation between the resource configuration of the request system information and the system information which are not received by the terminal equipment and sent by the network equipment.

Processor 1501 is specifically configured to switch to work on BWP configured with a common search space.

The transceiver 1502 and the processor 1501 cooperate, in particular, to send a second message to the network device via a random access procedure. In a possible implementation manner, the second message is MSG1, and the second information is a second preamble and/or resource information for transmitting MSG1. In another possible implementation manner, the second message is MSG3, and the second information is a second field in MSG3.

The transceiver 1502 and the processor 1501 cooperate, and in particular, are configured to send a second message to the network device through MAC signaling; the MAC signaling includes a MAC PDU, the MAC PDU includes one or more MAC sub-PDUs, the MAC sub-PDUs include a MAC sub-header and a MAC CE, the second information is carried in the MAC CE, and the MAC sub-header includes identification information for indicating the second information carried by the MAC CE.

The transceiver 1502 and the processor 1501 in cooperation may be specifically configured to send the second message to the network device via RRC signaling.

In one possible implementation, the RRC signaling may include a SUI.

The transceiver 1502 and the processor 1501 cooperate to be specifically configured to transmit the second message according to configuration information, where the configuration information is used to indicate transmission resources of the second message.

The transceiver 1502 and processor 1501, in cooperation, can also be configured to receive configuration information from a network device.

The processor 1501 and the transceiver 1502, in cooperation, may also be configured to reacquire the required system information upon determining that the terminal device is entering an idle state or an inactive state, or switching to BWP with a common search space.

The transceiver 1502 and the processor 1501 cooperate and are further configured to receive RRC signaling sent by the network device, where the RRC signaling includes system information; or, the method can also be used for receiving system information broadcast by the network equipment.

In one possible implementation, the system information is a second SIB. Processor 1501 may be specifically configured to: stopping a second timer corresponding to a second SIB acquired by receiving the broadcast; or determining that a second timer corresponding to a second SIB acquired by receiving a broadcast is invalid for the second SIB acquired by receiving an RRC signaling; or deleting all the stored second SIBs except the second SIB acquired by receiving the RRC signaling after the second SIB is acquired by receiving the RRC signaling; or acquiring the second SIB in a mode of receiving RRC signaling, and deleting all storage versions of the second SIB acquired in a mode of receiving broadcast; or after the terminal device acquires the second SIB by receiving the RRC signaling, starting or restarting a second timer corresponding to the second SIB acquired by receiving the RRC signaling; or when the second SIB acquired in a manner of receiving RRC signaling is successfully confirmed to be valid, starting or restarting a second timer corresponding to the second SIB acquired in a manner of receiving RRC signaling; or starting or restarting a second timer corresponding to the second SIB when the second SIB is successfully confirmed to be valid.

In a third application, the terminal device 1500 may execute the scheme correspondingly executed by the terminal device in fig. 13. As shown in fig. 15, the terminal apparatus 1500 includes:

the transceiver 1502 and the processor 1501 cooperate to receive third indication information from a network device, where the third indication information is used to indicate sizes of system information blocks SIB of different communication schemes. A processor 1501, configured to decode, by the terminal device, the SIB of the communication scheme supported by the terminal device according to the third indication information.

In a possible implementation, the processor 1501 is further configured to ignore SIBs of communication systems that are not supported by the terminal device.

It is to be understood that the processor 1501 in the embodiments of the present application may be implemented by a processor or processor-related circuit components, and the transceiver 1502 may be implemented by a transceiver or transceiver-related circuit components.

Based on the above and the same concept, the present application provides a communication apparatus for executing any one of the schemes on the network device side in the above method flow. Fig. 16 schematically illustrates a structure of a communication apparatus provided in the present application. The communication apparatus in this example may be a network device 1600, the network device 1600 including a processor 1600 and a transceiver 1602. Optionally, a memory 1603 may also be included. This network device 1600 may also be network device 301 in fig. 3 described above.

In one possible implementation, the processor 1601 and the memory 1603 may be integrated together, or the processor 1601 and the memory 1603 may be coupled via an interface; alternatively, the processor 501 is a hardware chip, and the memory 1503 is external to the chip, which is not limited in this application.

It should be noted that fig. 16 only shows a simplified design of the network device. In practical applications, the network device may include any number of processors, memories, transceivers, etc., and all network devices that can implement the present application are within the scope of the present application.

In a first application, the network device 1600 may execute the scheme correspondingly executed by the network device in fig. 3. As shown in fig. 16, the network device 1600 includes:

the transceiver 1602 and the processor 1601 cooperate to receive a first message from a terminal device and to send first system information to the terminal device, the first message including first information for indicating that the terminal device requests the first system information.

In one possible implementation, the first information includes any one or any multiple of information for indicating the first communication standard, information for indicating the first service, information for indicating the first system information block SIB, and information for indicating the first SI message.

A processor 1601 is further operable to schedule the terminal device to operate on a BWP configured with a common search space.

The transceiver 1602 and the processor 1601 are operable to cooperate, and in particular, to receive a first message from a terminal device that is transmitted via a random access procedure. In a possible implementation manner, the first message is MSG1, the first information is a first preamble and/or resource information of transmitting MSG1, and the first preamble and/or resource information of transmitting MSG1 correspond to at least one system information of the first communication system. Or, the first message is MSG3, and the first information is a first field in MSG3.

The processor 1601 is further configured to configure a mapping relationship between the resource information of the preamble and/or the transmit MSG1 and the at least one system information of the communication standard, where the mapping relationship includes a relationship between the resource information of the first preamble and/or the transmit MSG1 and the at least one system information of the first communication standard. The transceiver 1602 and the processor 1601 are operable to transmit the mapping to the terminal device.

The transceiver 1602 and the processor 1601 are cooperative, and specifically configured to receive a first message sent by a terminal device through MAC signaling; the MAC signaling includes a MAC PDU, where the MAC PDU includes one or more MAC sub-PDUs, the MAC sub-PDUs include a MAC sub-header and a MAC CE, the first information is carried in the MAC CE, and the MAC sub-header includes identification information for indicating the first information carried by the MAC CE.

The transceiver 1602 and the processor 1601 are operable to cooperate to receive a first message from a terminal device via RRC signaling.

In one possible implementation, the RRC signaling may include SUI.

The transceiver 1602 and the processor 1601 are cooperative, and are specifically configured to receive a first message sent by the terminal device according to configuration information, where the configuration information is used to indicate a sending resource of the first message, and the sending resource corresponds to the first system information.

The processor 1601 is further configured to configure configuration information, where the configuration information includes a correspondence between the transmission resource and the system information.

The transceiver 1602 and the processor 1601 are cooperative and further configured to send an RRC signaling to the terminal device, where the RRC signaling includes first system information; or, the first system information is also used for broadcasting to the terminal equipment.

In a second application, the network device 1600 may execute the scheme correspondingly executed by the network device side in fig. 11. As shown in fig. 16, the network device 1600 includes:

the transceiver 1602 and the processor 1601 cooperate to receive a second message from the terminal device and to send system information to the terminal device; the second message includes second information for notifying the network device that the terminal device needs system information, or for notifying the network device that the terminal device cannot acquire the system information, or for notifying the network device that the terminal device needs to switch the partial bandwidth BWP.

The processor 1601 is specifically configured to schedule the terminal device to work on a BWP configured with a common search space.

The transceiver 1602 and the processor 1601 are operable to cooperate, and in particular, to receive a second message from the terminal device that is transmitted via a random access procedure. In a possible implementation manner, the second message is MSG1, and the second information is a second preamble and/or resource information for transmitting MSG1. In another possible implementation manner, the second message is MSG3, and the second information is a second field in MSG3.

The transceiver 1602 and the processor 1601 cooperate to specifically receive a second message sent from the terminal device through MAC signaling; the MAC signaling includes a MAC PDU, the MAC PDU includes one or more MAC sub-PDUs, the MAC sub-PDUs include a MAC sub-header and a MAC CE, the second information is carried in the MAC CE, and the MAC sub-header includes identification information for indicating the second information carried by the MAC CE.

The transceiver 1602 and the processor 1601 are operable to cooperate to receive a second message from the terminal device via RRC signaling.

In one possible implementation, the RRC signaling is sidelink user equipment information SUI.

The transceiver 1602 and the processor 1601 are operable to receive a second message from the terminal device according to configuration information, where the configuration information is used to indicate transmission resources of the second message.

The transceiver 1602 and the processor 1601 are cooperative, and specifically configured to send an RRC signaling to the terminal device, where the RRC signaling includes system information; or may be specifically used to broadcast system information to terminal devices.

The processor 1601 is specifically configured to determine the sent system information according to the capability information reported by the terminal device and/or the triggered service information.

In a third application, the network device 1600 may execute the above-described scheme correspondingly executed by the network device in fig. 13. As shown in fig. 16, the network device 1600 includes:

the transceiver 1602 and the processor 1601 are configured to cooperate to send third indication information to the terminal device, where the third indication information is used to indicate sizes of system information blocks SIB of different communication schemes in the SI message.

In a possible implementation, the processor 1601 is specifically configured to map system information blocks SIB of different communication systems into the same SI message.

In a fourth application, the network device 1600 may execute the above-described scheme correspondingly executed by the network device in fig. 14. As shown in fig. 16, the network device 1600 includes:

a processor 1601, configured to map system information blocks SIB of different communication systems into different SI messages;

in one possible implementation, the transceiver 1602 and the processor 1601 cooperate to send SI messages to terminal devices.

In a possible implementation manner, the different communication systems include a third communication system and a fourth communication system, the third communication system is a new air interface NR, the fourth communication system is long term evolution LTE, the SIB of the third communication system includes an NR V2X SIB and an NR SIB other than the NR V2X SIB, and the SIB of the fourth communication system includes an LTE V2X SIB and an LTE V2X SIB other than the LTE V2X SIB.

Based on this implementation manner, in a possible implementation manner, the processor 1601 is specifically configured to map the SIB for NR and the SIB for LTE V2X into different SI messages; or mapping SIB of NR V2X and SIB of LTE V2X into different SI messages; or mapping the SIB of NR V2X, the SIB of NR except the SIB of NR V2X and the SIB of LTE V2X into different SI messages respectively; or respectively mapping the SIB of LTE V2X, the SIB of LTE V2X except the SIB of LTE V2X and the SIB of NR to different SI messages; or, respectively mapping the SIB of LTE V2X, the SIB of LTE V2X except the SIB of LTE V2X, the SIB of NR V2X, and the SIB of NR except the SIB of NR V2X into different SI messages.

In a fifth application, the network device 1600 includes:

the processor 1601 and the transceiver 1602 cooperate to determine that the third timer is expired or the second system information is changed, and send an RRC signaling to the terminal device, where the RRC signaling includes the second system information.

A processor 1601, which is specifically configured to maintain a third timer for the terminal device, wherein the third timer is associated with the second system information; and starting or restarting the third timer after determining that the RRC signaling comprising the second system information is sent to the terminal equipment, or when the RRC signaling comprising the second system information is sent to the terminal equipment, or before the RRC signaling comprising the second system information is sent to the terminal equipment.

The processor 1601 is specifically configured to determine that the terminal device enters an idle state or an inactive state, or that the terminal device switches to work on the partial bandwidth BWP having the common search space, and stop the third timer.

The processor 1601 is specifically configured to determine terminal device capability information and/or triggered service information; and determining the second system information according to the terminal equipment capability information and/or the service information.

It is to be understood that the processor 1601 in the embodiments of the present application may be implemented by a processor or processor-related circuit components, and the transceiver 1602 may be implemented by a transceiver or transceiver-related circuit components.

In a sixth application, the network device 1600 includes:

a processor 1601 may be configured to map SIBs of different services into different SI messages.

The transceiver 1602, in cooperation with the processor 1601, is configured to send an SI message to a first communication device.

In a seventh application, the network device 1600 includes:

the transceiver 1602 is configured to cooperate with the processor 1601 to send eleventh indication information to the terminal device, where the eleventh indication information is used to indicate whether the V2X-related system information carries a sidelink resource pool configuration.

When the communication apparatus is a terminal device, fig. 17 shows a schematic structural diagram of a simplified terminal device. For easy understanding and illustration, in fig. 17, the terminal device is a mobile phone as an example. As in fig. 17, terminal device 1700 includes a processor, a memory, a control circuit, and an antenna. The processor is mainly configured to process a communication protocol and communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support terminal device 1700 to execute the method executed by terminal device 1700 in any of the above embodiments. The memory is used primarily for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal device 1700, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

For ease of illustration, only one memory and processor are shown in FIG. 17. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in this application.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, the baseband processor is mainly used for processing the communication protocol and the communication data, and the central processing unit is mainly used for controlling the whole terminal device 1700, executing the software program, and processing the data of the software program. The processor in fig. 17 integrates the functions of the baseband processor and the central processing unit, and it should be noted that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. It should be noted that terminal device may include multiple baseband processors to adapt to different network formats, terminal device 1700 may include multiple central processing units to enhance its processing capability, and various components of terminal device 1700 may be connected through various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

In the present application, the antenna and the control circuit having the transmitting and receiving functions may be regarded as a transmitting and receiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 17, the terminal device includes a transceiving unit 1702 and a processing unit 1701. The transceiver unit may also be referred to as a transceiver, transceiving means, etc., and the processing unit may also be referred to as a processor, processing board, processing unit, processing means, etc. Alternatively, a device for implementing a receiving function in the transceiving unit may be regarded as a receiving unit, and a device for implementing a sending function in the transceiving unit may be regarded as a sending unit, that is, the transceiving unit includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, a receiving circuit, and the like, and the sending unit may be referred to as a transmitter, a sending circuit, and the like.

Downlink signals (including data and/or control information) transmitted by the network equipment are received on the downlink through the antenna, uplink signals (including data and/or control information) are transmitted to the network equipment or other terminal equipment through the antenna on the uplink, and traffic data and signaling messages are processed in the processor according to the radio access technology (e.g., the access technology of LTE, NR, and other evolved systems) adopted by the radio access network. The processor is further configured to control and manage the actions of the terminal device, and is configured to perform the processing performed by the terminal device in the foregoing embodiment. The processor is also configured to enable the terminal device to perform the method of fig. 17 that is related to the terminal device.

It will be appreciated that fig. 17 only shows a simplified design of the terminal device. In practical applications, the terminal device may include any number of antennas, memories, processors, etc., and all terminal devices that can implement the present application are within the scope of the present application.

It should be understood that the transceiving unit 1702 is configured to perform the transmitting operation and the receiving operation on the terminal device side in the method embodiment shown in fig. 3, and the processing unit 1701 is configured to perform other operations besides the transceiving operation on the terminal device side in the method embodiment shown in fig. 3.

For example, the transceiving unit 1702 is configured to perform transceiving steps on the terminal device side in the embodiment shown in fig. 4, for example, step 401. A processing unit 1701 for executing operations other than the transceiving operation on the terminal device side in the embodiment shown in fig. 4. Alternatively, the transceiving unit 1702 is configured to perform transceiving steps on the terminal device side in the embodiment shown in fig. 11, for example, step 1101. A processing unit 1701 for executing operations other than the transceiving operation on the terminal device side in the embodiment shown in fig. 11. Alternatively, the transceiving unit 1702 is configured to perform transceiving steps on the terminal device side in the embodiment shown in fig. 13. A processing unit 1701 is configured to perform other operations on the terminal device side in the embodiment shown in fig. 11, for example, step 1303. Alternatively, the transceiving unit 1702 is configured to perform transceiving steps on the terminal device side in the embodiment shown in fig. 14. A processing unit 1701 is configured to perform other operations on the terminal device side in the embodiment shown in fig. 11, for example, step 1401.

When the communication device is a chip, the chip includes a transceiver unit and a processing unit. The receiving and sending unit can be an input and output circuit and a communication interface; the processing unit is a processor or microprocessor or an integrated circuit integrated on the chip.

When the communication apparatus is a network device, fig. 18 exemplarily shows a schematic structural diagram of a network device provided in the present application, and as shown in fig. 18, the network device 1800 includes one or more Remote Radio Units (RRUs) 1801 and one or more baseband units (BBUs) 1802.RRU1801 may be referred to as a transceiver unit, transceiver, transceiving circuitry, or transceiver, etc., which may include at least one antenna 18011 and a radio unit 18012. The RRU1801 is mainly used for transceiving radio frequency signals and converting radio frequency signals and baseband signals. The BBU1802 portion may be referred to as a processing unit, processor, etc., and is primarily used for performing baseband processing, such as channel coding, multiplexing, modulation, spreading, etc., and also for controlling network devices, etc. RRU1801 and BBU1802 may be physically disposed together; or may be physically separated, i.e., distributed network devices.

In an example, the BBU1802 may be formed by one or more boards, where the boards may collectively support a radio access network (e.g., an LTE network) of a single access system, and may also respectively support radio access networks of different access systems. BBU1802 further includes a memory 18022 and a processor 18021. The memory 18022 is used to store the necessary instructions and data. The processor 18021 is configured to control the network device to perform necessary actions, for example, to control the network device to perform the method performed by the network device in any of the embodiments described above. The memory 18022 and processor 18021 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Or multiple boards may share the same memory and processor. In addition, each single board is provided with necessary circuits.

Uplink signals (including data and the like) transmitted by the communication device are received via antenna 18011 on the uplink, downlink signals (including data and/or control information) are transmitted to the communication device via antenna 18011 on the downlink, and traffic data and signaling messages are processed in processor 18021 according to the radio access technology (e.g., the access technology of LTE, NR, and other evolved systems) employed by the radio access network. The processor 18021 is further configured to control and manage actions of the network device, and is configured to perform the processing performed by the network device in the foregoing embodiments. The processor 18021 is also configured to support the network device to perform the method performed by the network device in fig. 4 or fig. 11 or fig. 13 or fig. 14.

It will be appreciated that fig. 18 merely illustrates a simplified design of a network device. In practical applications, the network device may include any number of antennas, memories, processors, radio frequency units, RRUs, BBUs, etc., and all network devices that can implement the present application are within the protection scope of the present application.

In this embodiment, taking RRU1801 as a transceiver and BBU1802 as a processor as an example, processor 18021 in network device 1800 may be configured to read a computer instruction in memory 18022 to execute configuration indication information for each packet, where the packet includes a first identifier. The transceiver is used for sending grouping information to the terminal equipment, the grouping information indicates the first identification included by one or more groups, and the grouping information also includes indication information corresponding to each group.

The processor 18021 may further implement any detailed functions of the network device in the method embodiments shown in fig. 4, fig. 11, fig. 13, or fig. 14, which are not described in detail herein, and refer to the processing steps executed by the network device in the method embodiments shown in fig. 4, fig. 11, fig. 13, or fig. 14. In one embodiment, the processor may separately implement the methods in the above embodiments, wherein the transceiver unit or the specific transceiver may also be one or more pins of the input and output of the processor.

It should be understood that the processor referred to in the embodiments of the present application may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

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

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Based on the foregoing and similar concepts, the present application provides a communication system. The communication system may include one or more of the aforementioned terminal devices, and one or more network devices. The terminal device can execute any method on the terminal device side, and the network device can execute any method on the network device side. For possible implementations of the network device and the terminal device, reference may be made to the above description, and details are not described here again.

It should be understood that the terms "first," "second," and the like in the description and claims of the embodiments of the application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such that a list of steps or elements is included. A method, system, article, or apparatus is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, system, article, or apparatus.

In the above embodiments, all or part of the implementation may be by software, hardware, firmware or any combination thereof, and when implemented using a software program, all or part of the implementation may be in the form of a computer program product. The computer program product includes one or more instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The instructions may be stored in or transmitted from one computer storage medium to another, for example, instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer storage media may be any available media that can be accessed by a computer or data storage device, such as a server, data center, etc., that includes an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a flexible Disk, a hard Disk, a magnetic tape, a magneto-optical Disk (MO), etc.), an optical medium (e.g., a CD, a DVD, a BD, an HVD, etc.), or a semiconductor medium (e.g., a ROM, an EPROM, an EEPROM, a non-volatile memory (NAND FLASH), a Solid State Disk (SSD)), etc.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by instructions. These instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

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

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method of communication, comprising:

a first communication device determining that a first condition is satisfied, the first condition comprising that the first communication device is currently in a connected state and that a common search space for other system information is not configured on a partial bandwidth, BWP, in which the first communication device is operating; or, the first condition includes that the first communication device is currently in a connected state, a common search space for other system information is configured on a partial bandwidth BWP in which the first communication device operates, and a broadcast state of the first system information is not broadcast; the working partial bandwidth BWP is an active BWP or an initial BWP; when the fifth timer is not running, the first communication device sends a first message to a second communication device, or the first communication device triggers to send the first message to the second communication device, where the first message includes first information used for instructing the first communication device to request first system information, and the first system information includes a first system information block SIB;

the first communication device starts or restarts the fifth timer;

the first communication device receiving RRC signaling from the second communication device, the RRC signaling including the first system information; or, the first communication device receives the first system information broadcast by the second communication device.

2. The method of claim 1, wherein the first condition further comprises any one or more of:

the first communication device has the capability of performing a first service;

configuring the first communication device to carry out the first service by an upper layer of the first communication device; or, the first communication device receives first indication information of the second communication device, where the first indication information is used to indicate the first communication device to perform a first service;

the first communication device does not store a valid version of the first system information;

and the first communication device receives second indication information of the second communication device, wherein the second indication information is used for indicating that the second communication device has the capability of sending the first system information.

3. The method of claim 2, wherein the method further comprises:

during the operation of the fifth timer, the first communication device refrains from transmitting the first message to the second communication device, or the first communication device refrains from triggering transmission of the first message to the second communication device.

4. The method of claim 2, wherein an upper layer of the first communications device comprises a vehicle networking V2X layer or a non-access stratum NAS layer or an application APP layer.

5. The method of claim 1 or 2, wherein the first communication device sending a first message to a second communication device, comprising:

the first communication device sends the first message to the second communication device through radio resource control, RRC, signaling.

6. The method of claim 1, wherein the first system information comprises a first SIB;

the method further comprises the following steps:

the first communication device stops a first timer corresponding to the first SIB acquired by a broadcast receiving mode; alternatively, the first and second electrodes may be,

the first communication device determines that a first timer corresponding to the first SIB acquired by receiving a broadcast is invalid for the first SIB acquired by receiving the RRC signaling; alternatively, the first and second electrodes may be,

after the first SIB is acquired by the first communication device by receiving the RRC signaling, deleting all first SIBs except the first SIB acquired by receiving the RRC signaling; alternatively, the first and second electrodes may be,

the first communication device acquires the first SIB in a mode of receiving the RRC signaling, and deletes all versions of the first SIB acquired in a mode of receiving the broadcast; or after the first communication device acquires the first SIB by receiving the RRC signaling, starting or restarting a first timer corresponding to the first SIB acquired by receiving the RRC signaling; alternatively, the first and second electrodes may be,

when the first SIB acquired by receiving the RRC signaling is successfully confirmed to be valid, the first communication device starts or restarts a first timer corresponding to the first SIB acquired by receiving the RRC signaling; alternatively, the first and second electrodes may be,

and the first communication device starts or restarts a first timer corresponding to the first SIB when the first SIB is successfully confirmed to be valid.

7. A communications apparatus comprising a processor coupled to a memory and executing instructions or programs within the memory to perform the method of any of claims 1-6.

8. A communication apparatus, comprising means for performing the method of any of claims 1-6.

9. A computer-readable storage medium, in which a software program is stored, which when read and executed by one or more processors, implements the method of any one of claims 1-6.