CN112689327A

CN112689327A - Service transmission method and system for satellite communication Internet of things

Info

Publication number: CN112689327A
Application number: CN202011589885.5A
Authority: CN
Inventors: 薛倩; 田华; 张谦
Original assignee: Dalian Linktech Infosystem Co ltd
Current assignee: Dalian Linktech Infosystem Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-04-20
Anticipated expiration: 2040-12-29
Also published as: CN112689327B

Abstract

According to the service transmission method and system for the Internet of things of the satellite mobile communication system, the idle physical resources of the preset paging channel in the satellite mobile communication system are utilized, the broadcast channel and the downlink transmission channel D-AGCH which are specially used for the service of the Internet of things are arranged, the downlink power of the satellite does not need to be increased, and the serious defects of forward power resources and system channel resources are avoided. In addition, one or more carriers are selected as the service carriers of the Internet of things in the preallocated wireless resources of the operation control system, and an uplink transmission channel D-RACH/an extended downlink Internet of things channel E-DAGCH is arranged on the carriers of the Internet of things, so that the operation control interface does not need to be modified. In addition, when the internet of things terminal receives and transmits the internet of things service data, the air interface does not need the RRC connection establishment process and the RB establishment process which are required in the conventional service establishment process of the satellite mobile communication system, the signaling overhead and the service access delay are reduced, and the utilization rate of system resources is improved.

Description

Service transmission method and system for satellite communication Internet of things

Technical Field

The application belongs to the technical field of communication, and particularly relates to a service transmission method and system for a satellite communication internet of things.

Background

In a satellite mobile communication system, signaling or services both need to use wireless resources, which mainly include: carrier, frequency, bandwidth, channel, power, etc. When the terminal access point wave beam establishes signaling/service, the gateway station needs to allocate uplink and downlink wireless resources to the terminal.

The internet of things service is a short data service, and is characterized by small data packets but large user quantity. The inventor finds that there are many disadvantages when the conventional service establishment scheme based on the satellite mobile communication system implements the service of the internet of things, for example, the forward transmission power of the satellite is increased, which causes serious shortage of forward power resources and system channel resources, and the operation control interface needs to be modified, so how to at least partially overcome the disadvantages, and how to provide an improved scheme for implementing the service of the internet of things based on the satellite mobile communication system becomes a subject worthy of research in the field.

Disclosure of Invention

In view of this, the present application provides a method and a system for transmitting services of the internet of things for satellite communication, which are used to overcome the disadvantages existing in the conventional service establishment scheme based on the satellite mobile communication system when the services of the internet of things are implemented.

The specific technical scheme is as follows:

a service transmission method for a satellite communication Internet of things comprises the following steps:

establishing a spot beam; when the spot beam is established, at least adding carrier information of an Internet of things uplink service channel D-RACH in a spot beam carrier example established at a gateway station controller GSC and a gateway transceiver station GTS side;

establishing an internet of things channel at the GSC side and the GTS side based on the established spot beam; the information of the Internet of things channel corresponding to the Internet of things channel at least comprises D-RACH channel information carried by carrier information of the D-RACH;

the GTS performs special system information broadcast of the Internet of things based on a broadcast channel arranged on idle physical resources of a preset paging channel in a satellite mobile communication system, and at least indicates whether a spot beam supports networking services based on conventional system information broadcast of the satellite mobile communication system; when the system supports the internet of things, the channel information of the internet of things is contained in the special system information of the internet of things for broadcasting;

if the spot beam supports the Internet of things service, the Internet of things terminal performs network access registration based on the Internet of things uplink service channel D-RACH indicated by the D-RACH channel information in the Internet of things special system information;

and after the registration is finished, the Internet of things terminal transmits uplink data based on the D-RACH, and/or receives downlink data transmitted by the Internet of things gateway on the GSC side based on an Internet of things downlink service channel D-AGCH preset on the idle physical resource of the preset paging channel.

Optionally, carrier information of an extended internet of things downlink traffic channel E-DAGCH is also added in the spot beam carrier instance;

the channel information of the Internet of things further comprises E-DAGCH channel information carried by the carrier information of the E-DAGCH; when performing a conventional system information broadcasting of the satellite mobile communication system, it is also indicated whether the spot beam supports the E-DAGCH channel.

Optionally, the internet of things uplink service channel D-RACH and the extended internet of things downlink service channel E-DAGCH specifically include:

one or more carriers are selected as the service carriers of the Internet of things from the radio resources pre-allocated when the operation control system of the satellite mobile communication system configures the spot beams, and the D-RACH and the E-DAGCH are arranged on the service carriers of the Internet of things.

Optionally, the broadcasting of the system information dedicated to the internet of things includes:

broadcasting special system information of the Internet of things based on a system information broadcast channel D-BCCH of the Internet of things;

setting the D-BCCH and the D-AGCH by using an idle frame of a high penetration paging channel BACH in a satellite mobile communication system; the reserved field on the broadcast control channel BCCH in the satellite mobile communication system is used to indicate whether the spot beam supports the support of networking traffic and whether the spot beam supports the E-DAGCH channel.

Optionally, the internet of things terminal performs network access registration based on the uplink traffic channel D-RACH indicated by the D-RACH channel information in the system information dedicated to internet of things, and the network access registration includes:

the Internet of things terminal sends a registration request on the D-RACH, and the GSC forwards the registration request of the Internet of things terminal to the Internet of things gateway;

the gateway of the Internet of things sends an authentication request, and the GSC forwards the authentication request to the terminal of the Internet of things through the D-AGCH;

the Internet of things terminal responds to the authentication request and sends an authentication response through the D-RACH, and the GSC forwards the authentication response of the Internet of things terminal to the Internet of things gateway;

the gateway of the Internet of things performs validity check on the terminal of the Internet of things based on the authentication response, and sends a registration response comprising a temporary identifier after the validity check is passed; the GSC forwards the registration response to the Internet of things terminal through the D-AGCH;

and the terminal of the Internet of things stores the temporary identifier and finishes registration.

Optionally, the transmitting, by the internet of things terminal, uplink data based on the D-RACH includes:

the Internet of things terminal sends uplink data on the D-RACH based on the temporary identifier, and the GSC sends the received uplink data to the Internet of things gateway;

the receiving downlink data transmitted by the internet of things gateway on the basis of the internet of things downlink service channel D-AGCH preset on the idle physical resource of the preset paging channel at the GSC side comprises the following steps:

and the Internet of things terminal receives downlink data of the Internet of things gateway forwarded by the GSC through the D-AGCH based on the temporary identifier.

Optionally, the method further includes:

and if the terminal of the Internet of things finds that the allocated temporary identifier is invalid, performing network access registration again based on the D-RACH.

Optionally, the receiving downlink data transmitted by the internet of things gateway on the GSC side based on the internet of things downlink traffic channel D-AGCH preset on the idle physical resource of the predetermined paging channel includes:

and when the system traffic exceeds the carrying capacity of the D-AGCH, receiving downlink data transmitted by the gateway of the Internet of things on the GSC side based on the D-AGCH or the E-DAGCH.

Optionally, the uplink data transmitted based on the D-RACH is any one of an uplink signaling, uplink service data, or acknowledgement information for the downlink data;

the downlink data transmitted based on the D-AGCH is any one of downlink signaling, downlink service data or acknowledgement information of the uplink data.

A service transmission system of a satellite communication Internet of things comprises:

the gateway controller GSC and the gateway transceiver GTS are used for establishing point beams and establishing an internet of things channel at the GSC and the GTS sides based on the established point beams;

when the spot beam is established, at least adding carrier information of an Internet of things uplink service channel D-RACH in a spot beam carrier example established at a gateway controller GSC and a gateway transceiver GTS side; the information of the Internet of things channel corresponding to the Internet of things channel at least comprises D-RACH channel information carried by carrier information of the D-RACH;

the GTS is also used for broadcasting the special system information of the Internet of things based on a broadcast channel arranged on the idle physical resource of a preset paging channel in the satellite mobile communication system, and at least indicating whether the spot beam supports the networking service based on the conventional system information broadcast of the satellite mobile communication system; when the system supports the internet of things, the channel information of the internet of things is contained in the special system information of the internet of things for broadcasting;

the Internet of things gateway is used for performing network access registration control on the Internet of things terminal and performing data transmission with the Internet of things terminal;

the internet of things terminal is used for: under the condition that the spot beam supports the Internet of things service, performing network access registration based on the Internet of things uplink service channel D-RACH indicated by the D-RACH channel information in the Internet of things special system information; and after the registration is finished, transmitting uplink data based on the D-RACH, and/or receiving downlink data transmitted by the Internet of things gateway based on an Internet of things downlink service channel D-AGCH preset on the idle physical resource of the preset paging channel at the GSC side.

Optionally, the system further includes:

and the operation and control system is used for pre-allocating the wireless resource information and allocating the pre-allocated wireless resource information to the spot beam before the spot beam is established.

Compared with the prior art, the technical scheme provided by the application has the following advantages:

according to the technical scheme, the method and the system for transmitting the service of the internet of things in the satellite mobile communication system set the broadcast channel and the downlink transmission channel D-AGCH special for the service of the internet of things by using the idle physical resource of the preset paging channel in the satellite mobile communication system, do not need to increase the downlink power of the satellite, and can not cause serious shortage of forward power resources and system channel resources. In addition, one or more carriers are selected as the service carriers of the Internet of things in the preallocated wireless resources of the operation control system, and an uplink transmission channel D-RACH/an extended downlink Internet of things channel E-DAGCH is arranged on the carriers of the Internet of things, so that the operation control interface does not need to be modified. In addition, when the internet of things terminal receives and transmits the internet of things service data, the air interface does not need the RRC connection establishment process and the RB establishment process which are required in the conventional service establishment process of the satellite mobile communication system any more, and as long as the internet of things terminal is registered in the internet of things gateway, the service data can be directly transmitted on an uplink/downlink internet of things channel, so that the signaling overhead and the service access delay are reduced, and the utilization rate of system resources is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a signaling interaction diagram of a conventional service establishment procedure of a satellite mobile communication system;

fig. 2 is a system architecture diagram of a satellite communication internet of things provided in an embodiment of the present application;

fig. 3 is a table of a channel raw frame format of the satellite mobile communication system;

fig. 4 is a frame format table including a D-BCCH/D-AGCH frame of the internet of things according to an embodiment of the present application;

fig. 5 is a schematic flowchart of a service transmission method of the internet of things for satellite communication according to an embodiment of the present application;

fig. 6 is a signaling interaction diagram of a service establishment procedure of an internet of things in a satellite mobile communication system according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a service transmission system of the internet of things for satellite communication according to an embodiment of the present application;

fig. 8 is another schematic structural diagram of a service transmission system of the internet of things for satellite communication according to an embodiment of the present application.

Detailed Description

For the sake of reference and clarity, the technical terms, abbreviations or abbreviations used hereinafter are to be interpreted in summary as follows:

AGCH: an Access Grant Channel, accessing an allowed Channel;

BACH: basic Alert Channel, Basic Alert Channel;

BCCH: broadcast Control Channel, Broadcast Control Channel;

DACCH: a Dedicated Associated Control Channel, a Dedicated Associated Control Channel;

D-AGCH: a Dedicated Access Grant Channel, a Dedicated Access Grant Channel;

D-BCCH: a Dedicated Broadcast Control Channel, a Dedicated Broadcast Control Channel;

D-RACH: a Dedicated Random Access Channel, a Dedicated Random Access Channel;

D-MES: a Dedicated MES, a Dedicated mobile terminal;

DCH: dedicated Channel, Dedicated Channel;

DTCH (DTCH): a Dedicated Traffic Channel, a Dedicated Traffic Channel;

E-DAGCH: extended D-AGCH, Extended D-AGCH;

GCN: gateway core network, Gateway station core network;

GSC: gateway Station Controller;

and (5) GTS: gateway transmitter Station, Gateway Transceiver Station;

MES: mobile Earth Station, Mobile terminal;

PDCH: packet Data physical Channel, Packet Data physical Channel;

RACH: random Access Channel, Random Access Channel;

RB: radio Bearer, Radio Bearer;

RRC: radio Resource Control, Radio Resource Control.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The related art and the findings related to the present invention will be first explained below.

In a satellite mobile communication system, signaling or services both need to use wireless resources, which mainly include: carrier, frequency, bandwidth, channel, power, etc. When the terminal access point wave beam establishes signaling/service, the gateway station needs to allocate uplink and downlink wireless resources to the terminal. Different types of signaling/traffic require different types of radio resources to be allocated. The larger the number of terminals, the more radio resources are required.

As shown in fig. 1, the conventional service establishment process of the satellite mobile communication system specifically includes:

firstly, when the system is initialized, the operation and control system allocates pre-allocated wireless resource information (broadcast channel, control channel, traffic channel, etc.) to the spot beam.

And secondly, activating spot beams according to the wireless resources configured by the operation and control system.

The spot beam activation process includes 3 parts:

1) a spot beam setup procedure.

The method mainly comprises the step of creating frequency point example information of spot beams on the GSC and GTS sides.

2) Channel (broadcast channel, common control channel, dedicated control channel, etc.) setup procedures contained under the spot beam.

The spot beam channel instance information is mainly created on the GSC and GTS sides.

3) System information broadcast procedure of spot beam.

The GSC mainly notifies information such as a common control channel to the terminal through a broadcast channel on the GTS side.

Thirdly, after the terminal reads the system information residence point wave beam, establishing an air interface RRC signaling connection:

1) a terminal initiates an RRC signaling connection establishment request on an uplink common control channel RACH;

2) the GSC transmits the allocated radio resources to the terminal on a downlink common control channel AGCH. The wireless resource distributed to the terminal by the GSC is a dedicated control channel resource or a service resource at the moment;

3) and the terminal sends an RRC signaling establishment completion response to the GSC on the allocated DACCH (dedicated control channel for RRC signaling).

And fourthly, the GSC informs the GCN to establish IU signaling connection corresponding to the terminal.

And fifthly, the GCN informs the GSC to establish service:

1) the GCN sends a service establishment request to the GSC;

2) the GSC allocates wireless resources for the service according to the domain type, rate size, etc. of the service. If the pre-allocated resources of the spot beams cannot meet the service requirement, the GSC applies real-time resources to the operation and control system;

3) the GSC transmits the radio resources allocated to the service to the terminal on a dedicated control channel DACCH.

4) And the terminal sends a service establishment completion response to the GSC on the newly allocated service channel.

The internet of things service is a short data service, and is characterized by small data packets but large user quantity. The inventor finds that the following defects exist when the conventional service establishing scheme based on the satellite mobile communication system realizes the service of the internet of things:

1) the satellite mobile communication system is a forward satellite power-limited system, and the system capacity is limited by the forward satellite power. Although the data volume of the service of the internet of things is not large, the user volume is large, if the service of the internet of things is accessed by using the conventional special control resource or service resource of the satellite mobile communication system, the forward power resource and the system channel resource are seriously insufficient, so that the access success rate of voice/data service and the like is greatly reduced, and the user experience is obviously reduced;

2) the pre-allocation resources allocated to the spot beams by the operation and control system are limited, the quantity of users of the internet of things is large, the pre-allocation resources cannot meet the resource requirements of the services of the internet of things, and at the moment, real-time resources need to be applied to the operation and control system. However, the gateway stations and the operation control system do not support networking services in their current interfaces, and therefore, using conventional methods would involve modification of the operation control interface;

3) if the conventional mode is used for accessing the service of the internet of things, the existing standard protocol of the conventional mode also involves modification, and the influence on the supported conventional service is large.

In view of the above, the present application discloses a method and a system for transmitting services of the internet of things for satellite communication, which are used for overcoming the above defects, implementing a system scheme compatible with services of the internet of things on the basis of a conventional service mode, and simultaneously achieving the technical purposes of enabling a satellite mobile communication system to support the services of the internet of things, not occupying more forward power resources of a satellite, not affecting the conventional services, and not modifying an operation control interface and a standard protocol of the conventional mode.

Referring to the architecture diagram of the satellite communication internet of things system shown in fig. 2, in the solution of the present application, a terminal supporting internet of things service is referred to as an internet of things terminal, and an internet of things service server corresponding to a conventional core network GCN is referred to as an internet of things gateway. The access and resource allocation of the internet of things services still need to be processed by GSC and GTS of the gateway station.

In order to realize the compatibility of the internet of things service on the basis of a conventional service mode and achieve the technical purpose, the internet of things channel definition is performed in advance. Specifically, 4 types of channels of the internet of things are newly defined, and the 4 types of channel attributes of the internet of things are all common channels, namely channels shared by users of the internet of things.

The 4 internet of things channels are specifically as follows:

a) downlink channel

The method comprises 3 downlink channels which are respectively as follows: the system information broadcast channel D-BCCH of the Internet of things, the downlink service channel D-AGCH of the Internet of things and the downlink service channel E-DAGCH of the expanded Internet of things.

In this embodiment, the D-BCCH and the D-AGCH do not need to newly occupy downlink carriers, but use the idle frame (BACH4) of the conventional high-penetration paging channel BACH in the satellite mobile communication system to perform the two channel settings, which can specifically compare the channel original frame format of the satellite mobile communication system provided with reference to fig. 3 with the internet-of-things D-BCCH/D-AGCH frame format of the present application in fig. 4.

The D-BCCH/D-AGCH and BACH4 time division multiplex the same physical channel, and the time slot length of the channel is fixed to 10.

The D-BCCH and D-AGCH are in a group of every 8 frames with a cycle period of 32 frames.

In the frame position of BACH4 within 64 frame period, D-BCCH appears once every 32 frames, and the rest BACH4 frames are D-AGCH.

The D-BCCH is used for transmitting Internet of things system information broadcast, and the Internet of things system information broadcast mainly comprises D-RACH channel list information and E-DAGCH channel list information supported by a system. The D-RACH channel list information may include, but is not limited to: the frequency point to which the channel belongs and the initial time slot of the channel; the E-DAGCH is essentially an extended D-AGCH, the purpose of the extended D-AGCH is the same as that of the D-AGCH, the extended D-AGCH is mainly used for carrying downlink signaling and data of the Internet of things, but the E-DAGCH needs to be configured with resources separately and can be used only when the system traffic exceeds the D-AGCH, unlike the existing BACH resources of a D-AGCH multiplexing system. That is, the E-DAGCH is not a mandatory channel, and whether the channel is present may be determined by the satellite capabilities. Normally, the channel is not set, and if the satellite capacity is improved, one to more downlink carriers can be selected from pre-allocated carriers of the operation control system to set the E-DAGCH channel.

The position of the D-AGCH is fixed, and an idle frame BACH4 of a conventional high penetration paging channel BACH in the system is carried, so that the idle frame BACH does not need to be broadcasted to the terminal of the Internet of things.

The D-AGCH/E-DAGCH is mainly used for transmitting downlink signaling/data and acknowledgement information of uplink data.

b) Uplink channel

The method comprises 1 uplink channel, and specifically comprises the following steps: and D-RACH is an uplink traffic channel of the Internet of things.

In implementation, one or more uplink carriers can be selected from carriers pre-allocated to the spot beam by the operation and control system to set the D-RACH channel. The slot length of the D-RACH channel is fixed to 25.

The uplink power of the satellite mobile communication system is not limited, and preferably, a plurality of D-RACH channels can be arranged by combining the characteristic that most of Internet of things services are uplink services.

The D-RACH is mainly used for transmitting uplink signaling/data and acknowledgement information for downlink data.

On this basis, referring to a schematic flow chart of a service transmission method of the internet of things for satellite communication provided in the embodiment of the present application shown in fig. 5, the method includes:

step 501, establishing spot beams; when the spot beam is established, at least the carrier information of the D-RACH of the uplink traffic channel of the Internet of things is added in the spot beam carrier example created by the gateway controller GSC and the GTS side of the gateway transceiver station.

The method for establishing the spot beam mainly comprises the steps that after an operation control system configures pre-allocated wireless resource information (a broadcast channel, a control channel, a service channel and the like) to the spot beam, a carrier instance of the spot beam is created on the GSC and the GTS side. The carrier example mainly includes information such as spot beams to which the frequency points belong, frequency point numbers, maximum transmission power of the carrier, time slot lists contained in the frequency points, time slot states and the like.

In order to realize compatibility of the internet of things service on the basis of a conventional service mode and achieve the technical purpose, in the embodiment of the application, carrier information of the D-RACH and the E-DAGCH is further added in the established carrier example. In implementation, one or more carriers can be selected as service carriers of the internet of things from the pre-allocated wireless resources when the operation control system of the satellite mobile communication system configures the spot beams.

Wherein the E-DAGCH is not a mandatory channel, whether the channel is determined by the presence of visible satellite capability.

Step 502, establishing an internet of things channel at the GSC and GTS sides based on the established spot beam; the information of the channel of the Internet of things corresponding to the channel of the Internet of things at least comprises the information of the D-RACH channel carried by the carrier information of the D-RACH.

The process of establishing the internet of things channel specifically comprises the following steps:

conventional channels (e.g., broadcast channels, common control channels, dedicated control channels, etc.) of the satellite mobile communications system are established.

The conventional channel of the satellite mobile communication system is established, mainly channel instance information of spot beams is created at the GSC and GTS sides, and the channel instance information may include, but is not limited to, information of a frequency point to which the channel belongs, a channel type, channel slot resources (a starting slot, a slot length), a transmission address and a port of the channel, and the like.

Thereafter, the establishment of an instance of an Internet of things channel is further added between the GSC and the GTS. In implementation, one or more carriers can be selected as the service carrier of the internet of things from the radio resources pre-allocated when the operation control system of the satellite mobile communication system configures the spot beam, and further, a D-RACH and an E-DAGCH are set on the service carrier of the internet of things, the D-RACH channel information is carried on the D-RACH carrier, and the E-DAGCH channel information is carried on the E-DAGCH carrier, so that the establishment of the channel instance of the internet of things is realized. See in particular fig. 6.

Of course, the E-DAGCH is not an optional channel, whether or not this channel is present may be determined by the satellite capabilities.

If the establishment of the Internet of things channel fails, the normal use of the spot beam is not influenced.

Step 503, the GTS performs internet-of-things dedicated system information broadcast based on a broadcast channel set on an idle physical resource of a predetermined paging channel in the satellite mobile communication system, and at least indicates whether the spot beam supports an internet-of-things service based on a conventional system information broadcast of the satellite mobile communication system; when supporting, the channel information of the internet of things is contained in the special system information of the internet of things for broadcasting.

Specifically, a reserved field in the broadcast control channel BCCH of the satellite mobile communication system conventional system information broadcast may be utilized to indicate whether the spot beam supports the underlay networking traffic and to indicate whether the spot beam supports the extended E-DAGCH channel. For example, a reserved field in the broadcast control channel BCCH sets a D-BCCH presence identity, an E-DAGCH presence identity to indicate that the spot beam supports the support of networking traffic, and supports extended E-DAGCH channels, etc.

If the spot beam supports the internet of things service, specific internet of things channel information needs to be included in the special system information of the internet of things for broadcasting.

The special system information broadcast of the Internet of things is carried on the D-BCCH, and the GTS sends the information broadcast to the terminal once every 32 frames. The D-BCCH does not need to newly occupy downlink carriers, but utilizes an idle frame (BACH4) of a conventional high penetration paging channel BACH in the satellite mobile communication system to set, namely, in the implementation, the idle frame (BACH4) of the conventional high penetration paging channel BACH can be used as idle physical resources of the preset paging channel to set a special system information broadcast channel of the Internet of things.

The conventional terminal keeps unchanged the processing of the reserved field in the conventional system information broadcast; and the terminal of the Internet of things reads the field value of the reserved field, if the terminal discovers that the spot beam supports the Internet of things service based on the field value of the reserved field, the terminal reads the information broadcast of the special system of the Internet of things at the moment when the D-BCCH appears, obtains the list information of the D-RACH channel and the list information of the E-DAGCH channel (because the E-DAGCH is not a necessary channel, the list of the E-DAGCH channel does not exist), and further obtains the information of the D-RACH channel and the information of the E-DAGCH channel based on the list information of the D-RACH channel and the list information.

And step 504, if the spot beam supports the Internet of things service, the Internet of things terminal performs network access registration based on the Internet of things uplink service channel D-RACH indicated by the D-RACH channel information in the Internet of things special system information.

After the field value of the reserved field is read and the spot beam support networking service is known, the terminal of the internet of things can further perform network access registration based on the D-RACH.

Referring to fig. 6, the process of network entry registration may include:

1) the Internet of things terminal sends a registration request on the D-RACH, and the GSC forwards the registration request of the Internet of things terminal to the Internet of things gateway;

2) the gateway of the Internet of things sends an authentication request, and the GSC forwards the authentication request to the terminal of the Internet of things through the D-AGCH;

the authentication request is used for requesting validity check of the terminal of the Internet of things.

The authentication request mainly carries the identification of the terminal of the internet of things and the RAND sequence used by the authentication algorithm.

3) The Internet of things terminal responds to the authentication request and sends an authentication response through the D-RACH, and the GSC forwards the authentication response of the Internet of things terminal to the Internet of things gateway;

4) the gateway of the Internet of things performs validity check on the terminal of the Internet of things based on the authentication response, and sends a registration response comprising a temporary identifier after the validity check is passed; the GSC forwards the registration response to the Internet of things terminal through the D-AGCH;

after the terminal of the Internet of things receives the authentication request, the authentication value is calculated according to the RAND sequence carried in the authentication request, then the authentication value is forwarded to the gateway through the GSC in the authentication response, the gateway judges whether the authentication value carried by the terminal is consistent with that locally calculated by the gateway, if so, the terminal of the Internet of things passes the validity check, otherwise, the terminal of the Internet of things does not pass the validity check.

5) The terminal of the Internet of things stores the temporary identifier and finishes registration; and after the registration is finished, the Internet of things terminal transmits data with the Internet of things gateway based on the temporary identifier.

And 505, after the registration is completed, the internet of things terminal transmits uplink data based on the D-RACH, and/or receives downlink data transmitted by the internet of things gateway on the basis of the internet of things downlink service channel D-AGCH preset on the idle physical resource of the predetermined paging channel on the GSC side.

Specifically, in uplink data transmission, the internet of things terminal sends uplink data such as an uplink service data packet, uplink signaling or downlink data confirmation information and the like on the D-RACH based on a temporary identifier distributed during network access registration, and the GSC sends the received uplink data to the internet of things gateway; if the service transmission is in the acknowledged mode, the service data packet may be segmented at the terminal side, and the GSC needs to reassemble the segments into a complete service packet.

If the uplink service data packet needs to be confirmed, the gateway of the Internet of things carries confirmation information in the downlink data transmission message, and the GSC forwards the message to the terminal of the Internet of things through the D-AGCH.

In the downlink data transmission, the gateway of the internet of things sends downlink data according to a requirement, and the content of the downlink data may be confirmation information of an uplink service data packet or a downlink signaling. The GSC forwards the downlink data to the Internet of things terminal through the D-AGCH; if the service transmission is in the acknowledged mode, the GSC may need to segment the data packet of the downlink data, and send the data packet to the internet of things terminal on the D-AGCH multiple times.

When the system traffic exceeds the carrying capacity of the D-AGCH, the terminal of the Internet of things can specifically receive downlink data transmitted by the gateway of the Internet of things on the basis of the D-AGCH or the E-DAGCH on the GSC side.

The method and the device utilize the physical resource of the idle high-penetration paging channel BACH4 in the satellite mobile communication system to set the physical resource as a downlink Internet of things channel and an Internet of things broadcast channel, so that the downlink power of the satellite is not increased; since the uplink power of the satellite mobile communication system is not limited, the uplink internet of things channel can be flexibly added according to the actual use requirement. Moreover, based on the scheme of the application, when the internet of things terminal receives and transmits the internet of things service data, the air interface does not need an RRC connection establishment process and an RB establishment process any more, and the service data can be directly transmitted on an uplink/downlink internet of things channel as long as the internet of things terminal is registered in the internet of things gateway, so that the signaling overhead and the service access delay are reduced, and the utilization rate of system resources is improved.

In addition, the expansion of the downlink Internet of things channel is considered, if the satellite capacity is improved in the future, the reserved field can be further utilized in the BCCH to indicate the beam of the Internet of things terminal point to support the expansion of the downlink Internet of things channel, so that more Internet of things terminals can be allowed to access, and the capacity of the Internet of things service of the system is improved.

In an optional embodiment of the present application, the temporary identifier assigned to the terminal of the internet of things during network entry registration has a validity period system, for example: in the embodiment, if the terminal of the internet of things finds that the allocated temporary identifier is invalid, network entry registration is performed again based on the D-RACH, and then data transmission of the internet of things can be further performed by using the newly allocated temporary identifier.

Corresponding to the service transmission method of the satellite communication internet of things, the embodiment of the application also discloses a service transmission system of the satellite communication internet of things. Referring to fig. 7, a schematic structural diagram of a service transmission system of the internet of things for satellite communication is shown, where the system includes:

the gateway controller GSC 701 and the gateway transceiver GTS 702 are used for establishing a spot beam and establishing an Internet of things channel on the GSC side and the GTS side based on the established spot beam;

the GTS 702 is further configured to perform internet-of-things dedicated system information broadcasting based on a broadcast channel set on an idle physical resource of a predetermined paging channel in the satellite mobile communication system, and at least indicate whether the spot beam supports an internet-of-things service based on conventional system information broadcasting of the satellite mobile communication system; when the system supports the internet of things, the channel information of the internet of things is contained in the special system information of the internet of things for broadcasting;

the internet of things gateway 703 is used for performing network access registration control on the internet of things terminal and performing data transmission with the internet of things terminal;

the internet of things terminal 704 is configured to: under the condition that the spot beam supports the Internet of things service, performing network access registration based on the Internet of things uplink service channel D-RACH indicated by the D-RACH channel information in the Internet of things special system information; and after the registration is finished, transmitting uplink data based on the D-RACH, and/or receiving downlink data transmitted by the Internet of things gateway based on an Internet of things downlink service channel D-AGCH preset on the idle physical resource of the preset paging channel at the GSC side.

In an optional implementation manner of the embodiment of the present application, as shown in fig. 8, the system may further include:

the operation and control system 705 is configured to pre-allocate radio resource information and configure the pre-allocated radio resource information to the spot beam before the spot beam is established.

In an optional implementation manner of the embodiment of the present application, carrier information of an extended internet of things downlink traffic channel E-DAGCH is further added to the spot beam carrier instance;

In an optional implementation manner of the embodiment of the present application, the internet of things uplink traffic channel D-RACH and the extended internet of things downlink traffic channel E-DAGCH specifically include:

In an optional implementation manner of the embodiment of the present application, the GTS 702 performs internet-of-things dedicated system information broadcast, including:

In an optional implementation manner of the embodiment of the present application, the performing, by the terminal 704 of the internet of things, network entry registration based on the uplink traffic channel D-RACH of the internet of things indicated by the D-RACH channel information in the system information dedicated to the internet of things includes:

In an optional implementation manner of the embodiment of the present application, the transmitting, by the internet of things terminal 704, uplink data based on the D-RACH includes:

the receiving, by the internet of things terminal 704, downlink data transmitted by the internet of things gateway on the GSC side based on the internet of things downlink traffic channel D-AGCH preset on the idle physical resource of the predetermined paging channel includes: and the Internet of things terminal receives downlink data of the Internet of things gateway forwarded by the GSC through the D-AGCH based on the temporary identifier.

In an optional implementation manner of the embodiment of the application, if the terminal of the internet of things finds that the allocated temporary identifier is invalid, network entry registration is performed again based on the D-RACH.

In an optional implementation manner of the embodiment of the present application, the receiving, by the internet of things terminal 704, downlink data transmitted by the internet of things gateway on the GSC side based on the internet of things downlink traffic channel D-AGCH preset on the idle physical resource of the predetermined paging channel includes:

In an optional implementation manner of the embodiment of the present application, uplink data transmitted based on the D-RACH is any one of uplink signaling, uplink service data, or acknowledgement information for the downlink data;

For the service transmission system of the satellite communication internet of things disclosed in the embodiment of the application, since the service transmission system of the satellite communication internet of things disclosed in any one of the embodiments corresponds to the service transmission method of the satellite communication internet of things disclosed in any one of the embodiments, the description is relatively simple, and for relevant similarities, please refer to the description of the service transmission method of the satellite communication internet of things in the embodiments above, and detailed description is omitted here.

To sum up, the method and the system for transmitting the service of the satellite communication internet of things provided by the embodiment of the application do not need to increase the forward transmitting power of the satellite, modify an operation control interface, modify a conventional standard protocol and influence the conventional terminal service when the service of the internet of things is realized. Compared with the conventional service establishment scheme based on the satellite mobile communication system, the method for realizing the service of the internet of things has the following technical advantages:

1) setting a broadcast channel D-BCCH and a downlink transmission channel D-AGCH special for the service of the Internet of things by using an idle high penetration paging channel BACH4 in a satellite mobile communication system; and broadcasting a reserved field on the BCCH by using the conventional system information to indicate whether the terminal point beam of the Internet of things supports the Internet of things service and whether the expanded downlink Internet of things channel is supported. The downlink power of the satellite does not need to be increased, and the serious shortage of the forward power resource of the satellite and the channel resource of the system can not be caused;

2) one or more carriers are selected as the service carriers of the Internet of things from the wireless resources pre-allocated by the operation control system, and an uplink transmission channel D-RACH/an extended downlink Internet of things channel E-DAGCH is arranged on the carriers of the Internet of things, so that the operation control interface does not need to be modified;

3) the behavior of the conventional terminal is unchanged, the terminal of the Internet of things obtains whether the spot beam supports the Internet of things service and supports the extended E-DAGCH channel or not by reading the reserved field of the conventional system information BCCH, and when the spot beam supports the extended E-DAGCH channel, the special system information of the Internet of things is read from the broadcast channel D-BCCH of the Internet of things, so that a D-RACH channel list/E-DAGCH channel list is obtained, and the compatibility of the Internet of things service on the basis of the conventional service mode is realized;

4) when the internet of things service is established, the air interface does not need an RRC establishment process and an RB establishment process any more, and service data can be directly transmitted on an uplink/downlink internet of things channel as long as the internet of things terminal is registered in the internet of things gateway.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

For convenience of description, the above system or apparatus is described as being divided into various modules or units by function, respectively. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.

From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.

Finally, it is further noted that, herein, relational terms such as first, second, third, fourth, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A service transmission method for a satellite communication Internet of things is characterized by comprising the following steps:

2. The method of claim 1, wherein the spot beam carrier instance is further augmented with carrier information of an extended internet of things downlink traffic channel E-DAGCH;

3. The method according to claim 2, wherein the internet of things uplink traffic channel D-RACH and the extended internet of things downlink traffic channel E-DAGCH are specifically:

4. The method of claim 2, wherein the broadcasting of the IOT specific system information comprises:

5. The method of claim 1, wherein the internet of things terminal performs network entry registration based on an uplink traffic channel D-RACH of the internet of things indicated by D-RACH channel information in the system information dedicated to the internet of things, and the method comprises:

6. The method of claim 5, wherein the transmitting of the uplink data by the terminal of the internet of things based on the D-RACH comprises:

7. The method of claim 5, further comprising:

8. The method according to claim 2, wherein the receiving downlink data transmitted by the internet of things gateway on the GSC side based on the internet of things downlink traffic channel D-AGCH preset on the idle physical resource of the predetermined paging channel comprises:

9. The method of claim 1, wherein the uplink data transmitted based on the D-RACH is any one of uplink signaling, uplink traffic data, or acknowledgement information for downlink data;

10. A service transmission system of a satellite communication Internet of things is characterized by comprising:

11. The system of claim 10, further comprising: