CN117015067A

CN117015067A - Information transmission method and related device

Info

Publication number: CN117015067A
Application number: CN202210491776.2A
Authority: CN
Inventors: 刘旭
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-11-07
Also published as: WO2023208117A1

Abstract

The embodiment of the application discloses an information transmission method and a related device, which can be applied to a satellite communication system. Wherein the method comprises the following steps: the network equipment sends a first message, and correspondingly, the terminal equipment receives the first message from the network equipment, wherein the first message is used for indicating the terminal equipment to release the radio resource control connection; the terminal equipment is switched from the service carrier to the anchor carrier, and receives the system message related to the ephemeris information sent by the network equipment. Therefore, by adopting the embodiment of the application, the network equipment can know when the terminal equipment is in the idle state, so that the terminal equipment in the idle state can be avoided from being scheduled, and further the resource waste is reduced.

Description

Information transmission method and related device

Technical Field

The present application relates to the field of communications technologies, and in particular, to an information transmission method and a related device.

Background

In a satellite communication system, for a terminal device in a connected state, when an uplink synchronization validity timer (ul-SyncValidityTimer) expires (i.e., the uplink synchronization validity expires), the terminal device needs to receive a system message related to ephemeris information (also may be referred to as a system message block (System Information Block, SIB) message related to the ephemeris information) to compensate for uplink synchronization. When the terminal device receives the system message related to the ephemeris information, it needs to release the radio resource control (Radio Resource Control, RRC) connection from the current traffic carrier and then switch to the anchor carrier, i.e. release from the connected state to the idle state, to receive the system message related to the ephemeris information. However, in this method, the network device cannot know when the terminal device is switched to the idle state, so that the network device may continuously schedule the terminal device, for example, allocate resources to the terminal device or send data, which causes a problem of resource waste.

Disclosure of Invention

The application provides an information transmission method and a related device, which can enable network equipment to clearly know when terminal equipment is switched to an idle state, thereby avoiding scheduling the terminal equipment in the idle state and further reducing resource waste.

In a first aspect, an embodiment of the present application provides an information transmission method, which is applied to a satellite communication system, where the method includes:

receiving a first message from a network device, the first message being used to instruct a terminal device to release a radio resource control connection;

and switching from the service carrier to the anchor carrier, and receiving the system message related to the ephemeris information.

It can be seen that, in the embodiment of the present application, the terminal device switches from the service carrier to the anchor carrier, that is, from the connection state to the idle state, in response to the first message from the network device, and receives the system message related to the ephemeris information. In this way, the network device can clearly know when the terminal device is switched to the idle state, that is, the network device and the terminal device can keep consistent understanding of the behavior of the terminal device, thereby avoiding scheduling the terminal device in the idle state and further reducing resource waste.

In an alternative embodiment, before the terminal device receives the first message from the network device, the method further comprises:

Transmitting a second message to the network device, the second message comprising at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

the superframe or radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

indicating to the network side that uplink synchronization needs to be performed,

indicating to the network side that the system message related to the ephemeris information needs to be received.

In an alternative embodiment, the first message includes timing duration configuration information for a timer that is started after the first message is received to determine whether the system message associated with the ephemeris information is completed before the timer expires.

In an alternative embodiment, before receiving the first message from the network device and while the terminal device is in the idle state, the method further comprises:

a system message is received that includes timing duration configuration information for a timer that is started after receiving the first message to determine whether the system message associated with the ephemeris information is complete before the timer expires.

In an alternative embodiment, the method further comprises:

After receiving the first message, starting a timer, wherein the timing duration of the timer is determined based on the timing duration configuration information;

before the timer is overtime, if the system information related to the ephemeris information is received, the radio resource control connection is restored; if the system message related to the ephemeris information is not received, connection establishment of the radio resource control connection is initiated to the network equipment.

In an alternative embodiment, if the second message includes at least one of: the remaining duration of the uplink synchronization validity, the overtime of the uplink synchronization validity timer, the radio frame where the uplink synchronization validity failure starts or is located, the superframe where the uplink synchronization validity failure starts and the radio frame where the uplink synchronization validity failure starts,

the reason why the first message also includes releasing the radio resource control connection is that: the uplink synchronization validity fails.

In a second aspect, an embodiment of the present application provides an information transmission method, applied to a satellite communication system, where the method includes:

and sending a first message to the terminal equipment, wherein the first message is used for indicating the terminal equipment to release the radio resource control connection.

It can be seen that, in the embodiment of the present application, after the network device sends the first message to the terminal device, the terminal device switches from the service carrier to the anchor carrier, i.e. from the connection state to the idle state, so as to receive the system message related to the ephemeris information. In this way, the network device can clearly know when the terminal device is switched to the idle state, that is, the network device and the terminal device can keep consistent understanding of the behavior of the terminal device, thereby avoiding scheduling the terminal device in the idle state and further reducing resource waste.

In an alternative embodiment, before the network device sends the first message to the terminal device, the method further includes:

receiving a second message from the terminal device, the second message comprising at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

the superframe where the uplink synchronization validity failure starts and the radio frame where it is located,

a request is made to release the radio resource control connection,

In an alternative embodiment, the first message further includes timing duration configuration information of a timer, and the timer is started after the first message is sent, so as to determine whether a request message for recovering the radio resource control connection sent by the terminal device is received before the timer expires.

In an alternative embodiment, the method further comprises:

and transmitting a system message comprising timing duration configuration information of a timer, wherein the timer is started after the first message is transmitted to determine whether a request message for recovering the radio resource control connection transmitted by the terminal equipment is received before the timer is overtime.

In an alternative embodiment, the method further comprises:

after the first message is sent, starting a timer, wherein the timing duration of the timer is determined based on the timing duration configuration information;

before the timer is overtime, if a request message for recovering the radio resource control connection sent by the terminal equipment is received, determining to recover the radio resource control connection; otherwise, the context information of the terminal equipment and the reserved wireless resources are released.

In a third aspect, an embodiment of the present application provides an information transmission method, applied to a satellite communication system, where the method includes:

transmitting a third message to the network device, wherein the third message is used for indicating the terminal device to request to receive the system message related to the ephemeris information;

A system message relating to ephemeris information is received from a network device.

Therefore, in the embodiment of the application, the terminal equipment does not need to be switched to the idle state, and after the third message is sent to the network equipment, the system message related to the ephemeris information from the network equipment can be received, so that the state transition of the terminal equipment can be reduced, and the service interruption can be further reduced.

In an alternative embodiment, the third message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

a radio frame where the uplink synchronization validity failure starts, or

The superframe where the uplink synchronization validity failure starts and the radio frame where it is located.

In an alternative embodiment, the ephemeris information related system message is sent by the network device via proprietary signaling.

In a fourth aspect, an embodiment of the present application provides an information transmission method, applied to a satellite communication system, where the method includes:

receiving a third message from the terminal device, wherein the third message is used for indicating the terminal device to request to receive the system message related to the ephemeris information;

and responding to the third message, and sending a system message related to the ephemeris information to the terminal equipment.

It can be seen that, in the embodiment of the present application, after the network device responds to the third message from the terminal device, the system message related to the ephemeris information can be sent to the terminal device, so that the state transition of the terminal device can be reduced, and further, the service interruption can be reduced.

In an alternative embodiment, the third message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

a radio frame where the uplink synchronization validity failure starts, or

In a fifth aspect, an embodiment of the present application provides an information transmission apparatus, applied to a satellite communication system, including:

a communication unit configured to receive a first message from a network device, the first message being configured to instruct a terminal device to release a radio resource control connection;

and the communication unit is also used for switching from the service carrier to the anchor carrier and receiving the system message related to the ephemeris information.

In a sixth aspect, an embodiment of the present application provides an information transmission apparatus, applied to a satellite communication system, including:

And the communication unit is used for sending a first message to the terminal equipment, wherein the first message is used for indicating the terminal equipment to release the radio resource control connection.

In a seventh aspect, an embodiment of the present application provides a method for an information apparatus, applied to a satellite communication system, where the apparatus includes:

a sending unit, configured to send a third message to the network device, where the third message is used to instruct the terminal device to request to receive a system message related to ephemeris information;

a receiving unit, configured to receive a system message related to ephemeris information from a network device.

In an eighth aspect, an embodiment of the present application provides a method for an information apparatus, applied to a satellite communication system, where the apparatus includes:

a receiving unit, configured to receive a third message from the terminal device, where the third message is used to instruct the terminal device to request to receive a system message related to ephemeris information;

and the sending unit is used for sending the system message related to the ephemeris information to the terminal equipment.

In a ninth aspect, an embodiment of the present application provides a communications apparatus comprising a processor and a memory, the processor and the memory being interconnected, wherein the memory is adapted to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to implement the steps in the method as devised in the first or third aspect above.

In a tenth aspect, an embodiment of the present application provides a communications apparatus comprising a processor and a memory, the processor and the memory being interconnected, wherein the memory is adapted to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to implement the steps in the method as devised in the second or fourth aspect above.

In an eleventh aspect, an embodiment of the present application provides a chip including a processor, a memory, and a computer program or instructions stored on the memory, where the processor executes the computer program or instructions to implement the steps in the method designed in any one of the first to fourth aspects.

In a twelfth aspect, an embodiment of the present application provides a chip module, including a transceiver component and a chip, where the chip includes a processor, a memory, and a computer program or instructions stored on the memory, and the processor executes the computer program or instructions to implement steps in the method designed in any one of the first to fourth aspects.

In a thirteenth aspect, an embodiment of the present application provides a computer readable storage medium, in which a computer program or instructions are stored which, when executed, implement the steps in the method devised in the first or third aspect above.

In a fourteenth aspect, embodiments of the present application provide a computer readable storage medium having stored therein a computer program or instructions which when executed implement the steps in the method devised in the second or fourth aspect above.

In a fifteenth aspect, embodiments of the present application provide a computer program product comprising a computer program or instructions which, when executed, implement the steps in the method devised in the first or second aspect above.

In a sixteenth aspect, embodiments of the present application provide a computer program product comprising a computer program or instructions which, when executed, implement the steps in the method devised in the second or fourth aspect above.

Drawings

Fig. 1 is a schematic structural diagram of an information transmission system according to an embodiment of the present application;

fig. 2 is a schematic flow chart of an information transmission method according to an embodiment of the present application;

fig. 3 is a flow chart of another information transmission method according to an embodiment of the present application;

fig. 4 is a flow chart of another information transmission method according to an embodiment of the present application;

Fig. 5 is a flow chart of another information transmission method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an information transmission device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to better understand the technical solution of the present application for those skilled in the art, the following describes the technical solution of the embodiment of the present application with reference to the accompanying drawings in the embodiment of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art to which the application pertains without inventive faculty, are intended to fall within the scope of the application.

The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates to the contrary. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any or all possible combinations of one or more of the listed items.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

It should be noted that, in the description and claims of the present application and in the above figures, the terms "first," "second," "third," etc. are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

In the embodiment of the present application, the network device may be a device for communication with the terminal device, which is responsible for radio resource management (radio resource management, RRM), quality of service (quality of service, qoS) management, data compression and encryption, data transceiving, and the like on the air interface side. The network device may be a Base Station (BS) in a communication system or a device deployed in a radio access network (radio access network, RAN) for providing wireless communication functions. For example, a base station (base transceiver station, BTS) in a GSM or CDMA communication system, a Node B (NB) in a WCDMA communication system, an evolved node B (evolutional node B, eNB or eNodeB) in an LTE communication system, a next generation evolved node B (next generation evolved node B, ng-eNB) in an NR communication system, a next generation node B (next generation node B, gNB) in an NR communication system, a Master Node (MN) in a dual-link architecture, a second node or Secondary Node (SN) in a dual-link architecture, and the like are not particularly limited thereto.

Optionally, the network device may also be other devices in the Core Network (CN), such as access and mobility management functions (access and mobility management function, AMF), user planning functions (user plan function, UPF), etc.; but also Access Points (APs) in a wireless local area network (wireless local area network, WLAN), relay stations, communication devices in a future evolved PLMN network, communication devices in an NTN network, etc.

Alternatively, the network device may comprise means, such as a system-on-chip, with the capability to provide wireless communication for the terminal device. By way of example, the chip system may include a chip, and may also include other discrete devices.

It should be noted that in some network deployments, the network device may be a separate node to implement all the functions of the base station, which may include a Centralized Unit (CU) and a Distributed Unit (DU), such as a gNB-CU and a gNB-DU; an active antenna unit (active antenna unit, AAU) may also be included. Wherein a CU may implement part of the functionality of the network device and a DU may also implement part of the functionality of the network device. For example, a CU is responsible for handling non-real-time protocols and services, implementing the functions of RRC layer, service data adaptation (service data adaptation protocol, SDAP) layer, packet data convergence (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (medium access control, MAC) and Physical (PHY) layers. In addition, the AAU can realize partial physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, in this network deployment, higher layer signaling (e.g., RRC layer signaling) may be considered to be transmitted by the DU or transmitted by both the DU and the AAU. It is understood that the network device may include at least one of CU, DU, AAU. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a core network, which is not particularly limited.

Alternatively, the network device may have a mobile nature, e.g., the network device may be a mobile device. Alternatively, the network device may be a satellite, a balloon station. For example, the satellite may be a Low Earth Orbit (LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous orbit (geostationary earth orbit, GEO) satellite, a high elliptical orbit (high elliptical orbit, HEO) satellite, or the like. Alternatively, the network device may be a base station disposed on land, in a water area, or the like.

In the embodiment of the present application, the terminal device may also be referred to as a terminal, where the terminal may be a User Equipment (UE), a remote/far-end terminal (remote UE), a relay device (relay UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote station, a mobile device, a user terminal, an intelligent terminal, a wireless communication device, a user agent, or a user equipment. The relay device is a terminal capable of providing a relay service to other terminals (including a remote terminal). In addition, the terminal may also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal in a next generation communication system (e.g., NR communication system) or a terminal in a future evolved public land mobile network (public land mobile network, PLMN), etc., without particular limitation.

Alternatively, the terminal may be deployed on land, including indoors or outdoors, hand-held, wearable or vehicle-mounted; can be deployed on the water surface (such as ships, etc.); but also may be deployed in the air (e.g., aircraft, balloon, satellite, etc.).

Alternatively, the terminal may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in unmanned automatic driving, a wireless terminal device in remote medical (remote medical), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation security (transportation safety), a wireless terminal device in smart city (smart city), or a wireless terminal device in smart home (smart home), or the like.

Further, the terminal may include a device having a transceiving function, such as a chip system. The chip system may include a chip and may also include other discrete devices.

In connection with the above description, an exemplary description is given below of an information transmission system according to an embodiment of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an information transmission system according to an embodiment of the present application. As shown in fig. 1, the information transmission system includes a terminal device 101 and a network device 102. Wherein the terminal device 101 may receive a first message from the network device 102, where the first message is used to instruct the terminal device to release the radio resource control connection; the terminal device 101 switches from the traffic carrier to the anchor carrier and receives the system message related to the ephemeris information. Therefore, by adopting the embodiment of the application, the network equipment can know when the terminal equipment is switched to the idle state, so that the terminal equipment in the idle state is prevented from being scheduled, and the resource waste is further reduced.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a flow chart of an information transmission method according to an embodiment of the application, which can be applied to a satellite communication system. For convenience of description, this information transmission method will be referred to as an information transmission method 200. As shown in fig. 2, the information transmission method 200 may include, but is not limited to, the following steps:

s201, the network equipment sends a first message to the terminal equipment, and correspondingly, the terminal equipment receives the first message from the network equipment; the first message is used to instruct the terminal device to release the radio resource control connection.

In an alternative embodiment, before the network device sends the first message to the terminal device, the method further includes: the terminal device sends a second message to the network device, and the network device receives the second message from the terminal device, wherein the second message comprises at least one of the following: the remaining duration of the uplink synchronization validity, the time of the timeout of the uplink synchronization validity timer, the radio frame where the start of the uplink synchronization validity failure is located or the radio frame where the start of the uplink synchronization validity failure is located, the superframe where the start of the uplink synchronization validity failure is located and the radio frame where the start of the uplink synchronization validity failure is located, the request to release the radio resource control connection, the indication to the network side of the need to execute the uplink synchronization, and the indication to the network side of the need to receive the system information related to the ephemeris information. Alternatively, the network side may be a network device.

Optionally, if the second message includes at least one of: the remaining duration of the uplink synchronization validity, the time of the timeout of the uplink synchronization validity timer, the radio frame where the start of the uplink synchronization validity failure is located or the radio frame where the start of the uplink synchronization validity failure is located, and the reason why the first message may further include releasing the radio resource control connection is: the uplink synchronization validity fails. In this way, the network device can learn, based on the information, the time when the validity of the uplink synchronization is invalid, so as to send the first message to the terminal device.

Optionally, the second message includes a request to release the radio resource control connection, so that the network device can learn, based on the request, that the terminal device needs to release the radio resource control connection, so that the first message can be sent to the terminal device.

Optionally, the second message includes a system message indicating to the network side that uplink synchronization needs to be performed or indicating to the network side that ephemeris information needs to be received, so that the network device can learn, based on the information, that the terminal device needs to release the radio resource control connection, and thus can send the first message to the terminal device.

S202, the terminal equipment is switched from the service carrier to the anchor carrier, and receives the system information related to the ephemeris information sent by the network equipment.

The terminal device may switch from the service carrier to the anchor carrier (i.e. release the radio resource control connection, switch from the connected state to the idle state) when receiving the first message, so as to receive the system message related to the ephemeris information sent by the network device.

Optionally, the system message related to the ephemeris information is broadcast periodically by the network device to the terminal devices in the cell.

Optionally, the system message related to the ephemeris information may include parameters related to the orbit of the satellite, parameters related to the ground coverage, and one or more parameters required for the terminal device to perform uplink synchronization compensation.

In an alternative embodiment, the first message may further include timing duration configuration information of a timer (or guard timer) that is started after the first message is received to determine whether the system message associated with the ephemeris information is completed before the timer expires.

In another alternative embodiment, before performing step S201, that is, before receiving the first message from the network device, and when the terminal device is in the idle state, the method further includes: receiving a system message including timing duration configuration information of a timer, the timer being configured to be started after receiving the first message to determine whether receiving the ephemeris information related system message is completed before the timer expires; accordingly, the network device transmits a system message including timing duration configuration information of a timer, and the timer is started after transmitting the first message, so as to determine whether a request message for replying to the radio resource control connection, which is transmitted by the terminal device, is received before the timer expires.

After receiving the first message, the terminal device may start a timer and switch from the service carrier to the anchor carrier, and receive a system message related to ephemeris information. Optionally, before the timer expires, if the system message related to the ephemeris information is received, recovering the radio resource control connection; if the system message related to the ephemeris information is not received, connection establishment of the radio resource control connection is initiated to the network equipment. Correspondingly, before the timer is overtime, if the network equipment receives a request message for recovering the radio resource control connection sent by the terminal equipment, determining to recover the radio resource control connection; otherwise, the network device will release the context information of the terminal device, the reserved radio resources.

It should be noted that, before the timer expires, if the terminal device completes receiving the system message related to the ephemeris information, the reason for recovering the radio resource control connection is: before the timer expires, the network device may reserve the radio resources previously allocated to the terminal device, and maintain the context information of the terminal device, so that when the terminal device needs to send and receive data, the radio resource control connection can be quickly restored (i.e. restored to the connection state) according to the context information. If the terminal device does not receive the system message related to the ephemeris information, the reason for initiating connection establishment of the radio resource control connection to the network device is as follows: after the timer expires, the network device releases the radio resources reserved for the terminal device and the context information of the terminal device, so that when the terminal device needs to send and receive data, the radio resource control connection needs to be re-established (i.e. connection establishment of the radio resource control connection is initiated to the network device).

Optionally, if the terminal device determines that data needs to be transmitted and received, the embodiment may be executed, and according to whether the timer times out and whether the reception of the system message is completed, it is determined to restore or reestablish the radio resource control connection to transmit and receive data; if it is determined that data transmission and reception are not required, the system can be in an idle state continuously.

In the embodiment of the application, the terminal equipment receives a first message from the network equipment, wherein the first message is used for indicating the terminal equipment to release the radio resource control connection; the terminal device responds to the first message, switches from the service carrier to the anchor carrier, and receives the system message related to the ephemeris information. It can be seen that the terminal device, upon receiving the first message, may switch from the traffic carrier to the anchor carrier, i.e. in an idle state, to receive the system message related to the ephemeris information. In this way, the network device can clearly know when the terminal device is switched to the idle state, that is, the network device and the terminal device can keep consistent understanding of the behavior of the terminal device, thereby avoiding scheduling the terminal device in the idle state and further reducing resource waste.

Referring to fig. 3, fig. 3 is a flowchart illustrating another information transmission method according to an embodiment of the present application, which can be applied to a satellite communication system. In the information transmission method shown in fig. 3, before the terminal device receives the first message from the network device, a second message is further sent to the network device, where the second message includes time information that the validity of the uplink synchronization is invalid. For convenience of description, this information transmission method will be referred to as an information transmission method 300. As shown in fig. 3, the information transmission method 300 may include, but is not limited to, the following steps:

S301, the terminal equipment sends a second message to the network equipment, and correspondingly, the network equipment receives the second message from the terminal equipment; the second message includes time information of the failure of the uplink synchronization validity.

Wherein the second message includes time information of failure of the uplink synchronization validity, for example, at least one of: the remaining duration of the uplink synchronization validity (ul-SyncValidity), the time of the uplink synchronization validity timer timeout, the radio frame in which the uplink synchronization validity failure (or called uplink synchronization validity expiration (ul-SyncValidity expire)) starts or is located, the superframe in which the uplink synchronization validity failure starts and the radio frame in which the uplink synchronization validity failure starts.

For example, the remaining duration of the uplink synchronization validity that the terminal device may send (or report) to the network device is 20ms, or the timeout time of the uplink synchronization validity timer is 10 minutes and 30 seconds, or the radio frame where the uplink synchronization validity failure starts or is located is the 28 th frame, etc. In this way, the network device can learn, based on the information, the time when the validity of the uplink synchronization is invalid, so as to send the first message to the terminal device.

Optionally, the time of the failure of the uplink synchronization validity may be when the remaining time length of the uplink synchronization validity arrives or before the remaining time length arrives, or when the timeout time of the uplink synchronization validity timer arrives, or when the radio frame where the failure of the uplink synchronization validity begins or where the failure of the uplink synchronization validity begins, or when the superframe where the failure of the uplink synchronization validity begins and the radio frame where the failure of the uplink synchronization validity occurs are reached.

And S302, before the effectiveness of the uplink synchronization is invalid, the network equipment sends a first message to the terminal equipment, and correspondingly, the terminal equipment receives the first message from the network equipment.

For example, if the second message sent by the terminal device to the network device is that the remaining duration of the uplink synchronization validity is 20ms, the network device may send the first message to the terminal device 3ms before the 20ms arrives.

For another example, if the second message sent by the terminal device to the network device is that the time-out time of the uplink synchronization validity timer is 10 minutes and 30 seconds, the network device may send the first message to the terminal device before the time of 10 minutes and 30 seconds arrives.

For another example, if the second message sent by the terminal device to the network device is that the radio frame where the uplink synchronization validity failure starts is the 18 th frame, the network device may send the first message to the terminal device before the uplink synchronization validity reaches the 18 th frame.

In an alternative embodiment, the first message may further comprise a cause of releasing the radio resource control connection is: the uplink synchronization validity fails. For example, the first message may carry a release cause (release cause) "uplink synchronization validity failure (ul-SyncValidity expire)". In this way, the terminal device may receive the system message related to the ephemeris information after receiving the first message.

S303, the terminal equipment is switched from the service carrier to the anchor carrier, and receives the system message related to the ephemeris information sent by the network equipment.

In step S302, the first message is used to instruct the terminal device to release the radio resource control connection, and after receiving the first message, the terminal device may switch from the service carrier to the anchor carrier, and receive the system message related to the ephemeris information. In an alternative embodiment, the specific description of the system message related to the ephemeris information may be referred to the description related to step S202, which is not repeated here.

In an alternative embodiment, the first message in step S302 further includes timing duration configuration information of a timer, which is used to start after receiving the first message, to determine whether the system message related to the ephemeris information is completed before the timer expires.

In another alternative embodiment, the terminal device may receive the system message before receiving the first message and while in the idle state. The system message is different from the ephemeris information related system message, and the system message comprises timing duration configuration information of the timer.

Correspondingly, after receiving the first message, the terminal equipment starts a timer and receives the system message related to the ephemeris information. Wherein the timing duration of the timer is determined based on the timing duration configuration information.

S304, after the terminal equipment finishes receiving the system information related to the ephemeris information, determining whether the timer is overtime, and if not, executing the step S305; if the time-out is over, step S306 is executed.

That is, before the timer expires, if the terminal device completes receiving the system message related to the ephemeris information, step S305 is executed; if the system message related to the ephemeris information is not received, step S306 is executed.

S305, the terminal equipment resumes the radio resource control connection.

Optionally, when the terminal device resumes the radio resource control connection, a request for resuming the radio resource control connection may be sent to the network device, and if the network device receives a request message for resuming the radio resource control connection sent by the terminal device, the network device determines to resume the radio resource control connection; otherwise, the network device releases the context information and the reserved radio resources of the terminal device, i.e. if the network device does not receive the request message for recovering the radio resource control connection sent by the terminal device, the context information and the reserved radio resources of the terminal device are released.

S306, the terminal equipment initiates connection establishment of the radio resource control connection to the network equipment.

Optionally, after the terminal device completes receiving the system message related to the ephemeris information, if the timer is overtime, the network device releases the context information of the terminal device and the radio resource reserved for the terminal device. Thus, when the terminal device needs to transmit and receive data, connection establishment of the radio resource control connection can be initiated to the network device.

It can be seen that, by adopting the embodiment of the application, the network device receives the second message from the terminal device, and can clearly know when the validity of the uplink synchronization is invalid, so that when the validity of the uplink synchronization is invalid, the terminal device is instructed to release the radio resource control connection. That is, the network device can clearly know when the terminal device is switched to the idle state, that is, the network device and the terminal device can keep consistent understanding of the behavior of the terminal device, so that the terminal device in the idle state is prevented from being scheduled, and resource waste is reduced.

Referring to fig. 4, fig. 4 is a flowchart illustrating another information transmission method according to an embodiment of the present application, which can be applied to a satellite communication system. In the information transmission method shown in fig. 4, before the terminal device receives the first message from the network device, a second message is further sent to the network device, where the second message includes a request for releasing the radio resource control connection. For convenience of description, this information transmission method will be referred to as an information transmission method 400. As shown in fig. 4, the information transmission method 400 may include, but is not limited to, the following steps:

S401, the terminal equipment sends a second message to the network equipment, and correspondingly, the network equipment receives the second message from the terminal equipment; the second message includes a request to release the radio resource control connection.

In an alternative embodiment, the second message may comprise a request to release the radio resource control connection because of the "system message related to the need to receive ephemeris information".

S402, the network equipment responds to the second message, the first message is sent to the terminal equipment, and correspondingly, the terminal equipment receives the first message from the network equipment.

S403, the terminal equipment switches from the service carrier to the anchor carrier, and receives the system message related to the ephemeris information sent by the network equipment.

In step S402, the first message is used to instruct the terminal device to release the radio resource control connection, and after receiving the first message, the terminal device may switch from the service carrier to the anchor carrier, and receive the system message related to the ephemeris information.

In an alternative embodiment, the specific description of the system message related to the ephemeris information may be referred to the description related to step S202, which is not repeated here.

In an alternative embodiment, the first message in step S402 further includes timing duration configuration information of a timer, which is used to start after receiving the first message, to determine whether the reception of the ephemeris information related system message is completed before the timer expires.

S404, after the terminal equipment finishes receiving the system information related to the ephemeris information, determining whether the timer is overtime, and if not, executing a step S405; if the time-out is over, step S406 is performed.

S405, the terminal equipment resumes the radio resource control connection.

S406, the terminal equipment initiates connection establishment of the radio resource control connection to the network equipment.

In an alternative embodiment, the specific descriptions of steps S404, S405 and S406 may be referred to the relevant descriptions of steps S304, S305 and S306, respectively, and will not be described herein.

It can be seen that, by adopting the embodiment of the present application, the network device receives the second message from the terminal device, and can clearly know that the terminal device needs to release the radio resource control connection, so as to instruct the terminal device to release the radio resource control connection. That is, the network device can clearly know when the terminal device is switched to the idle state, that is, the network device and the terminal device can keep consistent understanding of the behavior of the terminal device, so that the terminal device in the idle state is prevented from being scheduled, and resource waste is reduced.

The application also provides an information transmission method, in which, before the terminal device receives the first message from the network device, the terminal device also sends a second message to the network device, and correspondingly, the network device receives the second message from the terminal device; the second message includes a system message indicating to the network side that uplink synchronization needs to be performed or indicating to the network side that ephemeris information related system information needs to be received. In this way, the network device can learn, based on the second message, that the terminal device needs to release the radio resource control connection, so that the first message can be sent to the terminal device.

Optionally, as in the information transmission method 300, the second message includes time information of failure of the uplink synchronization validity; as in the information transmission method 400, the second message includes a request to release the radio resource control connection; the second message includes a system message indicating to the network side that uplink synchronization needs to be performed or indicating to the network side that ephemeris information needs to be received. The present application may also provide other information transmission methods including, but not limited to, one or more of the above-described information included in the second message, which is not set forth in detail herein by way of example.

In the information transmission method, the terminal equipment sends the second message to the network equipment, and correspondingly, after the network equipment receives the second message from the terminal equipment, the network equipment responds to the second message and sends the first message to the terminal equipment, and correspondingly, the terminal equipment receives the first message from the network equipment; the terminal equipment switches from the service carrier to the anchor carrier and receives the system information related to the ephemeris information; after the terminal equipment finishes receiving the system information related to the ephemeris information, determining whether a timer is overtime; if not, the radio resource control connection is restored, and if yes, the connection establishment of the radio resource control connection is initiated to the network equipment. Optionally, the specific implementation process of the above steps may be described in steps S402 to S406, which are not described herein.

Referring to fig. 5, fig. 5 is a flowchart of another information transmission method according to an embodiment of the present application, which can be applied to a satellite communication system. The difference from the above-mentioned information transmission method 200 is that in this information transmission method, it is explained that the terminal device does not need to switch to the idle state, and after sending the system message related to the request for the ephemeris information to the network device, the system message related to the ephemeris information can be received. For convenience of description, this information transmission method will be referred to as an information transmission method 500. As shown in fig. 5, the information transmission method 500 may include, but is not limited to, the following steps:

S501, the terminal equipment sends a third message to the network equipment, and correspondingly, the network equipment receives the third message from the terminal equipment; the third message is used for indicating that the terminal equipment requests to receive the system message related to the ephemeris information.

In an alternative embodiment, the specific description of the system message related to the ephemeris information may be referred to the description related to step S102, which is not repeated here.

In an alternative embodiment, the third message includes at least one of: the remaining duration of the uplink synchronization validity, the overtime of the uplink synchronization validity timer, the radio frame where the uplink synchronization validity failure starts, or the superframe where the uplink synchronization validity failure starts and the radio frame where the uplink synchronization validity failure starts.

S502, the network equipment responds to the third message, and sends the system message related to the ephemeris information to the terminal equipment, and correspondingly, the terminal equipment receives the system message related to the ephemeris information from the network equipment.

In the embodiment of the application, the terminal equipment sends a third message to the network equipment, wherein the third message is used for indicating the terminal equipment to request to receive the system message related to the ephemeris information; the network device responds to the third message and sends a system message related to the ephemeris information to the terminal device. By adopting the embodiment of the application, the terminal equipment does not need to be switched to the idle state, and the network equipment can respond to the third message from the terminal equipment and send the system message related to the ephemeris information to the terminal equipment, so that the terminal equipment can receive the system message related to the ephemeris information from the network equipment in the connection state, thereby reducing the state transition of the terminal equipment and further reducing the service interruption.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an information transmission device according to an embodiment of the application. As shown in fig. 6, the information transmission apparatus may include a communication unit 601 and a processing unit 602.

In an alternative embodiment, the information transmission apparatus is configured to perform the operations of the terminal devices in the above information transmission methods 200 to 400, for example:

a communication unit 601, configured to receive a first message from a network device, where the first message is used to instruct a terminal device to release a radio resource control connection;

the communication unit 601 is further configured to switch from a service carrier to an anchor carrier, and receive a system message related to ephemeris information.

In this embodiment, the communication unit 601 is further configured to send a second message to the network device before receiving the first message from the network device; the second message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

In this embodiment, the first message includes timing duration configuration information for a timer that is started after the first message is received to determine whether the system message associated with the ephemeris information is completed before the timer expires.

In this embodiment, before the communication unit 601 receives the first message from the network device, and when the terminal device is in the idle state, the communication unit is further configured to receive a system message including timing duration configuration information of a timer, where the timer is started after receiving the first message, so as to determine whether to complete receiving the system message related to the ephemeris information before the timer expires.

In this embodiment, the processing unit 602 is configured to start a timer after receiving the first message, where a timing duration of the timer is determined based on the timing duration configuration information;

the processing unit 602 is further configured to restore the radio resource control connection if the reception of the system message related to the ephemeris information is completed before the timer expires; if the system message related to the ephemeris information is not received, connection establishment of the radio resource control connection is initiated to the network equipment.

In this embodiment, if the second message includes at least one of: the remaining duration of the uplink synchronization validity, the time of the timeout of the uplink synchronization validity timer, the radio frame where the start of the uplink synchronization validity failure is located or the radio frame where the start of the uplink synchronization validity failure is located, and the reason that the first message further includes releasing the radio resource control connection is: the uplink synchronization validity fails.

In another alternative embodiment, the information transmission apparatus is configured to perform the operations of the network devices in the above information transmission methods 200 to 400, for example:

a communication unit 601, configured to send a first message to a terminal device, where the first message is used to instruct the terminal device to release a radio resource control connection.

In this embodiment, the communication unit 601 is further configured to receive, before sending the first message to the terminal device, a second message from the terminal device, where the second message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

A request is made to release the radio resource control connection,

In this embodiment, the first message further includes timing duration configuration information of a timer, and the timer is started after the first message is sent, so as to determine whether a request message for recovering the radio resource control connection sent by the terminal device is received before the timer expires. In this embodiment, the communication unit 601 is further configured to send a system message including timing duration configuration information of a timer, where the timer is started after sending the first message, so as to determine whether a request message for recovering the radio resource control connection sent by the terminal device is received before the timer expires.

In this embodiment, the processing unit 602 is configured to start a timer after sending the first message, where a timing duration of the timer is determined based on the timing duration configuration information;

the processing unit 602 is further configured to determine to resume the radio resource control connection if a request message for resuming the radio resource control connection sent by the terminal device is received before the timer expires; otherwise, releasing the context information of the terminal equipment and the reserved wireless resources.

In yet another alternative embodiment, the information transmission apparatus is configured to perform the operations of the terminal device in the information transmission method 500, for example:

a communication unit 601, configured to send a third message to the network device, where the third message is used to instruct the terminal device to request to receive a system message related to ephemeris information;

the communication unit 601 is further configured to receive a system message related to ephemeris information from the network device.

In this embodiment, the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame in which the uplink synchronization validity failure starts, or,

In this embodiment, the ephemeris information related system message is sent by the network device via proprietary signaling.

In yet another alternative embodiment, the information transmission apparatus is configured to perform the operations of the network device in the information transmission method 500, for example:

a communication unit 601, configured to receive a third message from the terminal device, where the third message is used to instruct the terminal device to request to receive a system message related to ephemeris information;

the communication unit 601 is further configured to send a system message related to ephemeris information to the terminal device in response to the third message.

In this embodiment, the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

In this embodiment, the ephemeris information related system message is sent by the communication unit 601 through proprietary signaling.

It can be understood that the specific implementation of each unit in the information transmission device and the beneficial effects that can be achieved in the information transmission device provided in the embodiments of the present application may refer to the description of the foregoing information transmission method embodiments, which is not repeated herein.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the application. Including a processor 701, a memory 702, and a communication bus for connecting the processor 701 and the memory 702.

The terminal device may also include a communication interface that may be used to receive and transmit data.

Memory 702 includes, but is not limited to, random access memory (random access memory, RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or portable read-only memory (compact disc read-only memory, CD-ROM), and memory 702 is used to store program code for execution and data for transmission.

The processor 701 may be one or more central processing units (Central Processing Unit, CPU), and in the case where the processor 701 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

In an alternative embodiment, the processor 701 may be configured to execute a computer program or instructions 703 stored in the memory 702 to perform the operations of the terminal device in the above-described information transmission methods 200 to 400, for example:

In this embodiment, the processor 701 is further configured to send a second message to the network device before receiving the first message from the network device, where the second message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

In this embodiment, the processor 701 is further configured to receive a system message including timing duration configuration information of a timer before receiving the first message from the network device, and when the terminal device is in an idle state, and the timer is configured to be started after receiving the first message, so as to determine whether the reception of the system message related to the ephemeris information is completed before the timer expires.

In this embodiment, the processor 701 is further configured to:

In another alternative embodiment, the processor 701 may be further configured to execute a computer program or instructions 703 stored in the memory 702 to perform the operations of the network devices in the above-described information transmission methods 200 to 400, for example:

In this embodiment, the processor 701 is further configured to receive, before sending the first message to the terminal device, a second message from the terminal device, where the second message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

In this embodiment, the first message further includes timing duration configuration information of a timer, and the timer is started after the first message is sent, so as to determine whether a request message for recovering the radio resource control connection sent by the terminal device is received before the timer expires.

In this embodiment, the processor 701 is further configured to send a system message including timing duration configuration information of a timer, where the timer is configured to start after sending the first message, to determine whether a request message for recovering the radio resource control connection sent by the terminal device is received before the timer expires.

In this embodiment, the processor 701 is further configured to:

before the timer is overtime, if a request message of recovering the radio resource control connection sent by the terminal equipment is received, determining to recover the radio resource control connection; otherwise, the context information of the terminal equipment and the reserved wireless resources are released.

In yet another alternative embodiment, the processor 701 may be configured to execute a computer program or instructions 703 stored in the memory 702 to perform the operations of the terminal device in the above-described information transmission method 500, for example:

In this embodiment, the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

In this embodiment, the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

It will be appreciated that the specific implementation of the processor 701 and the benefits that can be achieved refer to the foregoing description of the embodiments of the information transmission method, and are not repeated herein.

The embodiment of the application also provides a chip, which comprises: a processor, a memory and a computer program or instructions stored on the memory, wherein the processor executes the computer program or instructions to carry out the steps described in the above method embodiments.

The embodiment of the application also provides a chip module, which comprises a receiving and transmitting assembly and a chip, wherein the chip comprises a processor, a memory and a computer program or instructions stored on the memory, and the processor executes the computer program or instructions to realize the steps described in the embodiment of the method.

The embodiments of the present application also provide a computer-readable storage medium storing a computer program or instructions which, when executed, implement the steps described in the method embodiments above.

Embodiments of the present application also provide a computer program product comprising a computer program or instructions which, when executed, implement the steps described in the method embodiments above.

In the foregoing embodiments, the descriptions of the embodiments of the present application are emphasized, and in part, not described in detail in one embodiment, reference may be made to related descriptions of other embodiments.

The respective devices and products described in the above embodiments include units/units, which may be software units/units, may be hardware units/units, or may be partly software units/units, and partly hardware units/units. For example, for each device of the application or integrated chip, each unit/unit contained in the product may be implemented by hardware such as a circuit, or at least part of units/units may be implemented by software program, where the units/units run on an integrated processor inside the chip, and the rest of units/units may be implemented by hardware such as a circuit; for each device and product corresponding to or integrated with the chip module, each unit/unit contained in the device and product can be realized in a hardware mode such as a circuit, different units/units can be located in the same piece (such as a chip, a circuit unit and the like) or different components of the chip module, at least part of units/units can be realized in a software program mode, and the software program runs in the rest unit/unit of the integrated processor inside the chip module and can be realized in a hardware mode such as a circuit; for each device or product of the terminal, the included units/units may be implemented in hardware such as a circuit, different units/units may be located in the same component (for example, a chip, a circuit unit, etc.) or different components in the terminal, or at least part of units/units may be implemented in a software program, where the sequence runs on a processor integrated in the terminal, and the remaining units/units may be implemented in hardware such as a circuit.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, or may be embodied in software instructions executed by a processor. The software instructions may be comprised of corresponding software elements that may be stored in random access memory (random access memory, RAM), flash memory, read-only memory (ROM), erasable programmable read-only memory (erasable programmable ROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disk, a removable disk, a compact disc read-only memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (application specific integrated circuit, ASIC). In addition, the ASIC may reside in a terminal device or a network device. The processor and the storage medium may reside as discrete components in a terminal device or network device.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented, in whole or in part, in software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

The foregoing detailed description of the embodiments of the present application further illustrates the purposes, technical solutions and advantageous effects of the embodiments of the present application, and it should be understood that the foregoing description is only a specific implementation of the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. An information transmission method applied to a satellite communication system, the method comprising:

receiving a first message from a network device, wherein the first message is used for indicating a terminal device to release radio resource control connection;

2. The method of claim 1, wherein prior to receiving the first message from the network device, the method further comprises:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

The radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

3. The method according to claim 1 or 2, wherein the first message further comprises timing duration configuration information of a timer, the timer being adapted to be started after receiving the first message, to determine whether the reception of the ephemeris information related system message is completed before the timer expires.

4. The method according to claim 1 or 2, wherein before the receiving the first message from the network device and while the terminal device is in an idle state, the method further comprises:

a system message including timing duration configuration information of a timer is received, the timer being configured to be started after receiving the first message to determine whether receiving the ephemeris information related system message is completed before the timer expires.

5. The method according to claim 3 or 4, characterized in that the method further comprises:

After receiving the first message, starting the timer, wherein the timing duration of the timer is determined based on the timing duration configuration information;

before the timer is overtime, if the system information related to the ephemeris information is received, the radio resource control connection is restored; and if the system information related to the ephemeris information is not received, initiating connection establishment of the radio resource control connection to the network equipment.

6. The method of claim 2, wherein if the second message comprises at least one of: the remaining duration of the uplink synchronization validity, the overtime of the uplink synchronization validity timer, the radio frame where the uplink synchronization validity failure starts or is located, the superframe where the uplink synchronization validity failure starts and the radio frame where the uplink synchronization validity failure starts,

the reason why the first message further includes releasing the radio resource control connection is that: the uplink synchronization validity fails.

7. An information transmission method applied to a satellite communication system, the method comprising:

8. The method of claim 7, wherein prior to the sending the first message to the terminal device, the method further comprises:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

9. The method according to claim 7 or 8, wherein the first message further comprises timing duration configuration information of a timer, the timer being started after sending the first message to determine whether a request message sent by the terminal device to restore the radio resource control connection is received before the timer expires.

10. The method according to claim 7 or 8, characterized in that the method further comprises:

and sending a system message comprising timing duration configuration information of a timer, wherein the timer is started after sending the first message so as to determine whether a request message for recovering the radio resource control connection sent by the terminal equipment is received before the timer is overtime.

11. The method according to claim 9 or 10, characterized in that the method further comprises:

starting the timer after the first message is sent, wherein the timing duration of the timer is determined based on the timing duration configuration information;

12. The method of claim 8, wherein if the second message comprises at least one of: the remaining duration of the uplink synchronization validity, the overtime of the uplink synchronization validity timer, the radio frame where the uplink synchronization validity failure starts or is located, the superframe where the uplink synchronization validity failure starts and the radio frame where the uplink synchronization validity failure starts,

13. An information transmission method applied to a satellite communication system, the method comprising:

A system message associated with the ephemeris information is received from the network device.

14. The method of claim 13, wherein the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

a radio frame where the uplink synchronization validity failure starts, or

15. The method of claim 13, wherein the ephemeris information related system message is sent by the network device via proprietary signaling.

16. An information transmission method applied to a satellite communication system, the method comprising:

receiving a third message from a terminal device, wherein the third message is used for indicating the terminal device to request to receive a system message related to ephemeris information;

17. The method of claim 16, wherein the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

The time out of the uplink synchronization validity timer,

a radio frame where the uplink synchronization validity failure starts, or

18. The method of claim 16, wherein the ephemeris information related system message is sent by a network device via proprietary signaling.

19. An information transmission apparatus for use in a satellite communication system, the apparatus comprising:

a communication unit, configured to receive a first message from a network device, where the first message is used to instruct the terminal device to release a radio resource control connection;

the communication unit is further configured to switch from a service carrier to an anchor carrier, and receive a system message related to ephemeris information.

20. The apparatus of claim 19, wherein the

A communication unit, configured to send a second message to the network device before receiving the first message from the network device, where the second message includes at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

21. The apparatus according to claim 19 or 20, wherein the first message comprises timing duration configuration information of a timer, the timer being adapted to be started after receiving the first message to determine whether reception of the ephemeris information related system message is completed before the timer expires.

22. The apparatus of claim 19 or 20, wherein prior to receiving the first message from the network device, and while the terminal device is in an idle state,

the communication unit is further configured to receive a system message including timing duration configuration information of a timer, the timer being configured to be started after receiving the first message, to determine whether receiving the system message related to ephemeris information is completed before the timer expires.

23. The apparatus according to claim 21 or 22, further comprising a processing unit;

The processing unit is used for starting the timer after the communication unit receives the first message, and the timing duration of the timer is determined based on the timing duration configuration information;

the processing unit is further configured to restore the radio resource control connection if the reception of the system message related to the ephemeris information is completed before the timer expires; and if the system information related to the ephemeris information is not received, initiating connection establishment of the radio resource control connection to the network equipment.

24. The apparatus of claim 20, wherein if the second message comprises at least one of: the remaining duration of the uplink synchronization validity, the overtime of the uplink synchronization validity timer, the radio frame where the uplink synchronization validity failure starts or is located, the superframe where the uplink synchronization validity failure starts and the radio frame where the uplink synchronization validity failure starts,

25. An information transmission apparatus for use in a satellite communication system, the apparatus comprising:

26. The apparatus of claim 25, wherein the communication unit is further configured to receive a second message from the terminal device before sending the first message to the terminal device, the second message comprising at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

the radio frame where the uplink synchronization validity failure starts,

a request is made to release the radio resource control connection,

27. The apparatus according to claim 25 or 26, wherein the first message further comprises timing duration configuration information of a timer, the timer being configured to be started after sending the first message, to determine whether a request message sent by the terminal device to restore the radio resource control connection is received before the timer expires.

28. The apparatus according to claim 25 or 26, wherein the communication unit is further configured to send a system message comprising timing duration configuration information of a timer, the timer being configured to be started after sending the first message, to determine whether a request message sent by the terminal device to resume the radio resource control connection is received before the timer expires.

29. The apparatus according to claim 27 or 28, further comprising a processing unit;

the processing unit is used for starting the timer after the communication unit sends the first message, and the timing duration of the timer is determined based on the timing duration configuration information;

the processing unit is further configured to determine to restore the radio resource control connection if a request message for restoring the radio resource control connection sent by the terminal device is received before the timer expires; otherwise, the context information of the terminal equipment and the reserved wireless resources are released.

30. The apparatus of claim 25, wherein if the second message comprises at least one of: the remaining duration of the uplink synchronization validity, the overtime of the uplink synchronization validity timer, the radio frame where the uplink synchronization validity failure starts or is located, the superframe where the uplink synchronization validity failure starts and the radio frame where the uplink synchronization validity failure starts,

31. An information transmission apparatus for use in a satellite communication system, the apparatus comprising:

A communication unit, configured to send a third message to a network device, where the third message is used to instruct the terminal device to request to receive a system message related to ephemeris information;

the communication unit is configured to receive a system message related to the ephemeris information from the network device.

32. The apparatus of claim 31, wherein the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

33. The apparatus of claim 31, wherein the ephemeris information related system message is sent by the network device via proprietary signaling.

34. An information transmission apparatus for use in a satellite communication system, the apparatus comprising:

a communication unit, configured to receive a third message from a terminal device, where the third message is used to instruct the terminal device to request to receive a system message related to ephemeris information;

the communication unit is configured to send, in response to the third message, a system message related to the ephemeris information to the terminal device.

35. The apparatus of claim 34, wherein the third message comprises at least one of:

the remaining duration of the validity of the uplink synchronization,

the time out of the uplink synchronization validity timer,

36. The apparatus of claim 34, wherein the ephemeris information related system message is sent by a network device via proprietary signaling.

37. A communication device, characterized in that the device comprises a processor and a memory, which are connected to each other, wherein the memory is adapted to store a computer program, which computer program comprises program instructions, which processor is configured to invoke the program instructions to perform the information transmission method according to any of claims 1 to 6, or to perform the information transmission method according to any of claims 7 to 12, or to perform the information transmission method according to claims 13 to 15, or to perform the information transmission method according to claims 16 to 18.

38. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to perform the information transmission method of any one of claims 1 to 6, or cause the processor to perform the information transmission method of any one of claims 7 to 12, or cause the processor to perform the information transmission method of any one of claims 13 to 15, or cause the processor to perform the information transmission method of claims 16 to 18.