CN116015410A - Cluster communication service architecture and method of satellite mobile communication system - Google Patents
Cluster communication service architecture and method of satellite mobile communication system Download PDFInfo
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Abstract
The invention discloses a cluster communication service architecture and a method of a satellite mobile communication system, wherein the service architecture comprises an operation control system, a cluster controller, a cluster base station and a satellite terminal, wherein the cluster base station completes cluster physical channel processing and cluster message identification and forwarding; the cluster controller realizes cluster call control, resource allocation and scheduling functions; and the operation control system supports the whole network cluster resource planning and the cluster physical channel switching planning by combining task demand expansion on the basis of the whole network resource planning. The method comprises a self-adaptive cluster service call flow and a low-rail cluster communication plan switching flow. The invention has simple structure, can be realized by upgrading on the existing satellite mobile communication base station without adding additional devices, has high network stability and high information security, reduces the occupation of the common control channel by the trunking broadcast message, reduces the interaction flow in the network in the low orbit satellite switching control process, and improves the communication efficiency.
Description
Technical Field
The invention relates to the technical field of satellite mobile communication systems, in particular to a cluster communication service architecture and a method of a satellite mobile communication system.
Background
A satellite mobile communication system is a communication system for providing voice, short message, data services to large-scale mobile subscribers, and provides high-gain wireless signals to subscribers through high-orbit satellites or low-orbit constellations. The satellite mobile communication system built and put into practical use in the world at present mainly comprises Inmarsat, thuraya, tiantong and other synchronous orbit satellites, iridium, globalStar and other low orbit constellations. A typical low orbit constellation satellite communication system consists of three parts, namely a space segment, a ground segment and an application segment, as shown in fig. 1. The space segment is composed of a low orbit satellite constellation; a satellite constellation is a set of satellites that are launched into orbit to function normally, and is usually a satellite network formed by configuring a plurality of satellites in a certain manner; the low orbit satellite constellation is a low orbit satellite network composed of a plurality of low orbit satellites, as shown in fig. 2. The ground section is used as an important component of the low-orbit constellation satellite communication system to complete the functions of satellite load management, service processing, network management, operation management, cross-country service settlement and the like of the low-orbit constellation satellite communication system, and is responsible for interconnection and interworking between the low-orbit constellation satellite communication system and other systems, and mainly comprises an operation control center, a global operation service center and gateway stations distributed in all the regions; the application section consists of various fixed and mobile terminals distributed in the coverage area of the low orbit constellation beam, the terminals are portals and application platforms for users to access the low orbit constellation satellite communication system, the application sections are used for establishing data transmission links between the users and satellites, and each terminal has the switching capability among beams, satellites and gateway stations and can provide continuous business services for the users.
The trunking communication system is a radio mobile communication system for realizing multi-user sharing multi-channel according to a dynamic channel assignment mode, generally comprises terminal equipment, a base station, a central control station and the like, and has functions of scheduling, group call, priority call and the like. The trunking communication system is mainly applied to a professional mobile communication system, and is a mobile communication system for group scheduling command communication. The available channels of the system can be shared by all users of the system, and the system is a multipurpose and high-performance wireless dispatch communication system which shares resources, cost and shared channel equipment and services.
The biggest characteristic of trunking communication is that PTT (Push To Talk) is adopted for communication, the trunking communication is connected in a push-to-talk mode, a called party can answer without taking off the hook, the connection speed is high, and the trunking communication can support the functions of group calling and the like. The operation mode of the cluster communication is mainly simplex and half duplex, mainly adopts a channel dynamic allocation mode, and users have different priorities and special functions, so that the communication can meet the requirements. The trunking communication is realized by sharing common communication resources among all users, and the use efficiency of frequency resources is greatly improved.
The low-rail trunking communication system is usually based on the design of a ground trunking system, and adopts a trunking service state machine, which mainly comprises three states of idle state, solitary state, listening state and the like, and the state machine is shown in fig. 3. The idle state refers to that the user is in a state of receiving downlink trunking broadcast messages, the user is allowed to access through a trunking access channel, and the unique state refers to that the user obtains the authority of uplink service transmission and then carries out uplink voice, short message, picture and other transmission; the listening state means that the user receives downlink traffic and does not allow the user to access through the trunking traffic channel.
To accommodate satellite communication characteristics, satellite constellation physical channels are custom designed to implement low-orbit constellation as shown in table 1. The satellite terminal participates in the trunking communication service through trunking physical channels, and the trunking physical channels support logic channels such as downlink broadcasting, uplink access, downlink service, uplink service and the like. The cluster physical channel is the core for realizing the cluster service, and provides the capabilities of applying, synchronizing, transmitting the unique voice and listening to the voice for the cluster users. Typical trunking traffic channel formats are shown in the following table, with trunking traffic channels typically multiplexed on trunking traffic resources, and the multiplexing of logical channels into physical channels is scheduled by the trunking controller.
Table 1 typical trunking communication physical channel structure
Satellite trunking services are usually implemented based on existing satellite communication systems, where the trunking services need to utilize common control channels of the existing satellite communication systems, such as GMR-1 based satellite mobile communications, where the common control channels are as follows:
(1) System broadcast channel
BCCH (Broadcast Control CHannel): and broadcasting a control channel, wherein the downlink is unidirectional, and the control channel is used for the mobile terminal to initially search and acquire a channel of the system configuration parameters.
(2) Common control channel CCCH (Common Control CHannel)
PCH (Paging CHannel): and the paging channel is used for paging the called mobile terminal in downlink one-way.
RACH (Random Access CHannel): the random access channel is uplink unidirectional and is used for the mobile terminal to request the system to allocate a special signaling channel.
AGCH (Access Grant CHannel): and accessing an acknowledgement channel, downlink unidirectionally, and allocating a special control channel for the requested mobile terminal by the response of the system to the RACH.
(3) Dedicated control channel
SDCCH: (Standalone Dedicated Control CHannel): and the special control channel is bidirectional in uplink and downlink and is used for the point-to-point signaling interaction of the mobile terminal to the system.
Patent 1 (application number 201810919286.1, application date 2018-08-14) proposes a satellite cluster real-time voice group call control method, when a group call is carried out on the basis of the existing stationary orbit satellite to a TDMA channel of a ground mobile terminal, a gateway station core network still carries out signaling interaction in a conventional service single call flow, the interface and the signaling flow of an original conventional gateway station controller are unchanged, and a voice single call access function is maintained; the cluster gateway station controller is connected with the gateway station core network through an interface of the original conventional gateway station and the core network, and the cluster gateway station realizes the fast entering of the cluster group calling mobile terminal group and the cluster group calling mobile terminal group into a group calling service channel through signaling adaptation; the mobile terminal and the trunking gateway station are respectively added with a trunking protocol stack function; patent 2 (application number 202111381639.5, application days 2021-11-22) proposes a trunking communication method of a low-orbit constellation satellite communication system, and sets a low-orbit trunking communication frame structure: aiming at the trunking communication service of a low orbit constellation satellite communication system, adding a channel associated signaling on a service channel or an uplink shared channel, and controlling a communication link to realize synchronization between a satellite terminal and a satellite; low-rail trunking communication switching process: the satellite terminal is switched in the base station under the same gateway station or between the base stations under the same gateway station; in the switching process, the cluster controller selects matched frequency resources from the global start to allocate, so that resource allocation and switching negotiation between the cluster controller and the base station are realized.
The trunking service is realized according to the traditional trunking communication architecture, network equipment such as a trunking base station, a gateway station and the like is modified greatly, however, when a satellite network formally provides service for a user, the network stability is affected by adding the trunking service on the current network, and a simplified trunking architecture is needed to be designed, so that the influence of the trunking service on the operation of the current network is reduced.
In a GEO satellite cluster, by configuring a cluster signaling broadcast channel in each beam, resource allocation and security information of a cluster group currently in an active state are broadcasted to the whole network, when the number of satellite beams is small, resources occupied by the cluster signaling broadcast channel can be tolerated, but when the number of satellite beams is large, the cluster signaling broadcast channel occupies a large amount of system resources, so that it is needed to design a self-adaptive cluster service call flow to realize cluster signaling broadcast according to needs.
Unlike the ground trunking communication system and GEO satellite trunking communication, in the low orbit satellite communication system, the satellite moves at a high speed relative to the ground, so that the ground terminal performs periodic inter-satellite switching, for example, in the iridium satellite, the residence time of one user in one beam is about 1 minute, and the frequent switching causes the user to perform trunking channel resource switching between different satellites and different beams, so that a reasonably designed switching process is required to solve the problem of trunking service switching.
Disclosure of Invention
The invention aims to provide a trunking communication service architecture and a communication method which are simple in architecture, can be realized by upgrading an existing trunking base station without adding an additional device, are high in network stability and high in information security, realize trunking signaling broadcasting on demand by adopting a self-adaptive trunking service call flow, and reduce the interaction flow in a network in a low-orbit satellite switching control process by adopting a reasonably designed switching flow.
The technical solution for realizing the purpose of the invention is as follows: the cluster communication service architecture of the satellite mobile communication system comprises an operation control system, a cluster controller, a cluster base station and a satellite terminal, wherein:
the operation control system plans cluster service channel resources for one or more cluster controllers according to task demands, and realizes the planning of the resources of the whole network system; according to the group operation condition reported by the cluster controller, dynamically generating a whole-network cluster service resource plan comprising the current active cluster controller ID, the cluster ID and service channel resource allocation plan data, and issuing the whole-network cluster service resource plan to the cluster controller; the operation control system combines task demand expansion to support whole network cluster resource planning and cluster physical channel switching planning on the basis of public service;
the cluster controller is used for managing the group and the resource planned by the operation control system and comprises call control, resource allocation, resource scheduling, message forwarding and group management functions; in a low-orbit satellite communication system, a plurality of cluster controllers are configured to realize the management of different groups;
the cluster base station is used for processing a cluster service channel, and comprises channel modulation and demodulation, coding and decoding, service and control data forwarding; group calling access channel processing, identifying group calling access information from random access information, and forwarding the group calling access information to a corresponding cluster control satellite terminal controller; merging the cluster broadcasting message into a system broadcasting message and distributing the system broadcasting message;
the satellite terminal is used for realizing the setting and acquisition of the communication state by the terminal user and completing the communication.
A trunking communication method of satellite mobile communication system includes self-adaptive trunking service call flow and low orbit trunking communication plan switching flow, concretely as follows:
the self-adaptive cluster service call flow is as follows: under the beam distributed without the trunking broadcast message, the trunking group member triggers the network side to distribute the trunking broadcast message under the beam through autonomous calling, thereby realizing the on-demand distribution of the trunking broadcast message and reducing the occupation of the trunking broadcast message to the broadcast channel resource;
the low-rail trunking communication plan switching flow is as follows: and integrating the cluster user position, satellite ephemeris and whole network resource planning information to generate a cluster service resource list according to time slice sequence, and automatically configuring the cluster service resource list to a satellite terminal and a cluster base station by a cluster controller according to the cluster service resource configuration list to realize the planned switching of the cluster users.
Compared with the prior art, the invention has the remarkable advantages that: (1) The satellite mobile communication cluster service architecture can support a plurality of independent cluster controllers in an expanding manner, and meets the independent management and control application requirements of users on cluster information; (2) The satellite trunking service architecture simplifies the implementation complexity of trunking base stations and reduces the coupling degree of the channel equipment functions of the existing satellite-borne base stations or gateway stations; (3) The trunking service call flow can reduce occupation of the trunking broadcast message to a common control channel; (4) The cluster handoff process reduces the interaction process within the network during the low orbit satellite handoff control process.
Drawings
Fig. 1 is a schematic diagram of a typical satellite mobile communication system.
Fig. 2 is a schematic diagram of the structure of a low-rail constellation.
Fig. 3 is a schematic diagram of a typical clustered traffic state machine.
Fig. 4 is a schematic structural diagram of a trunked communication service architecture of a satellite mobile communication system according to the present invention.
Fig. 5 is a schematic flow chart of an adaptive trunked service call in the present invention.
Fig. 6 is a schematic flow chart of switching of the low-rail cluster communication scheme in the invention.
Detailed Description
The invention relates to a cluster communication service architecture of a satellite mobile communication system, which comprises an operation control system, a cluster controller, a cluster base station and a satellite terminal, wherein:
the operation control system plans cluster service channel resources for one or more cluster controllers according to task demands, and realizes the planning of the resources of the whole network system; according to the group operation condition reported by the cluster controller, dynamically generating a whole network cluster service resource plan comprising the current active cluster controller ID, the group ID and service channel resource allocation plan data, and issuing the whole network cluster service resource plan to the cluster controller; the operation control system combines task demand expansion to support whole network cluster resource planning and cluster physical channel switching planning on the basis of public service;
the cluster controller is used for managing the group and the resource planned by the operation control system and comprises call control, resource allocation, resource scheduling, message forwarding and group management functions; in a low-orbit satellite communication system, a plurality of cluster controllers are configured to realize the management of different groups;
the cluster base station is used for processing a cluster service channel, and comprises channel modulation and demodulation, coding and decoding, service and control data forwarding; group calling access channel processing, identifying group calling access information from random access information, and forwarding the group calling access information to a corresponding cluster control satellite terminal controller; merging the cluster broadcasting message into a system broadcasting message and distributing the system broadcasting message;
the satellite terminal is used for realizing the setting and acquisition of the communication state by the terminal user and completing the communication.
As a specific example, the cluster controller is configured at a gateway station or a service management station side.
As a specific example, when the mobile communication satellite is a transparent forwarding architecture, the cluster base station is deployed in a gateway station system and integrated on a gateway station base station processing platform; when the mobile communication satellite is a processing forwarding architecture, the clustered base stations are deployed on the satellite or as software in the clustered base stations.
The invention relates to a trunking communication method of a satellite mobile communication system, which comprises a self-adaptive trunking service call flow and a low-orbit trunking communication plan switching flow, and specifically comprises the following steps:
the self-adaptive cluster service call flow is as follows: under the beam distributed without the trunking broadcast message, the trunking group member triggers the network side to distribute the trunking broadcast message under the beam through autonomous calling, thereby realizing the on-demand distribution of the trunking broadcast message and reducing the occupation of the trunking broadcast message to the broadcast channel resource;
the low-rail trunking communication plan switching flow is as follows: and integrating the cluster user position, satellite ephemeris and whole network resource planning information to generate a cluster service resource list according to time slice sequence, and automatically configuring the cluster service resource list to a satellite terminal and a cluster base station by a cluster controller according to the cluster service resource configuration list to realize the planned switching of the cluster users.
As a specific example, the adaptive trunking service call flow includes the following steps:
step 1.1, a satellite terminal applies for group calling service to a certain cluster controller through a universal random access channel RACH, and after receiving a group calling service request message, a cluster base station forwards the message to a corresponding cluster controller according to a cluster controller ID carried in the message;
step 1.2, after receiving the cluster service request message, the cluster controller identifies the user identity according to the user ID and the cluster ID information;
step 1.3, the group members acquire the group broadcast message by monitoring the system broadcast message, and add the group broadcast message into the group service according to the resource and key configuration in the message;
step 1.4, the satellite terminal initiates disconnection by using an uplink disconnection command on a trunking service channel, the trunking controller judges the identity of the satellite terminal, if the trunking controller is a group leader or a manager, the trunking controller sends a disconnection command in the direction of a downlink broadcast channel, and after receiving the downlink disconnection command, all the satellite terminals under the channel leave the channel by themselves and enter an idle state to wait for the next call;
and 1.5, the cluster controller clears the resource configuration and key information of the current cluster group in the cluster group broadcast message, configures the message to the cluster base station, and updates the system broadcast information according to the latest cluster group broadcast message.
As a specific example, after receiving the trunking service request message, the trunking controller in step 1.2 identifies the user identity according to the user ID and the trunking ID information, and specifically includes:
step 1.2.1, if the satellite terminal is a cluster group leader, the cluster controller distributes cluster service channel resources to the satellite terminal through a common channel AGCH; after receiving the trunking service channel resources, the satellite terminal realizes the trunking group length and network two-way authentication through the trunking service channel, and distributes corresponding group key information;
step 1.2.2, if the satellite terminal is a cluster group member, checking whether the current cluster group is activated, if so (working on other satellites), distributing cluster service channel resources for the satellite terminal, and forwarding group security key information; if the cluster group is not activated, rejecting the satellite terminal to access;
step 1.2.3, the cluster controller generates a cluster group broadcast message including a cluster group ID, cluster service channel resources and group security key information, and sends the message to a cluster base station; the trunking base station combines the trunking group broadcast message into a system broadcast message and broadcasts it to other satellite terminals.
As a specific example, in the adaptive trunking service call flow, when a trunking group member needs to send information such as voice, short message and data, a PTT button on a terminal is pressed, a mobile terminal sends an uplink channel occupation request on a trunking access channel, a trunking controller sends an occupation confirmation signaling on a trunking broadcast channel in a downlink direction, a talker user who receives the signaling obtains an uplink channel use right, and other users cannot use the channel until the talker releases the uplink channel; when the PTT key is released, the mobile terminal transmits an uplink channel release signaling on the channel, and the cluster gateway station controller transmits an uplink idle signaling on the downlink channel; any user can press the PTT key to apply for uplink occupation and send uplink request signaling.
As a specific example, the low-rail trunking communication plan switching process includes the following steps:
step 2.1, the operation control system periodically generates a whole network cluster service resource plan according to the whole network resource configuration, the area where the cluster users are located and the low orbit satellite ephemeris data, and respectively configures the whole network cluster service resource plan to corresponding cluster controllers;
step 2.2, the cluster controller generates a cluster switching command according to the time of the cluster service resource plan, configures the cluster switching command to a cluster base station of a corresponding satellite, transmits the cluster switching command to a network cluster user through a cluster broadcasting channel, updates a cluster broadcasting message and transmits the cluster broadcasting message to the corresponding cluster base station;
step 2.3, the satellite receives the trunking switching command and trunking broadcasting message, and processes the two conditions of the internal beam switching of the satellite and the inter-satellite switching;
and 2.4, the satellite terminal acquires a cluster switching command through a cluster broadcast channel, and selects an optimal satellite beam for switching according to the command and the satellite terminal position.
As a specific example, the satellite in step 2.3 receives the trunking switch command and the trunking broadcast message, and processes the trunking switch command and the trunking broadcast message in two cases of intra-satellite beam switching and inter-satellite switching, which are specifically as follows:
step 2.3.1, when the internal wave beam of the satellite is switched, after the trunking base station receives the trunking switching command, on one hand, before two frames before the activation time, the trunking switching command is broadcast through the trunking physical channel, on the other hand, the corresponding trunking physical channel resource information is validated on the target wave beam according to the time information, and the released source wave beam trunking channel resource is recovered; in addition, cluster broadcasting information is updated at the source beam and the target beam;
and 2.3.2, when the satellites are switched, after the source satellite trunking base station receives the trunking switching command, on one hand, the trunking switching command is broadcast through the trunking physical channel before two frames before the activation time, and on the other hand, the released trunking channel resources are recovered according to the time information.
As a specific example, the step 2.3.2 further includes: updating cluster broadcasting information at a source satellite; and after receiving the cluster switching command, the target satellite cluster base station takes effect of corresponding cluster physical channel resource information on the target beam according to the time information, and updates cluster broadcasting information on the target beam.
The invention will be described in further detail with reference to the drawings and the specific examples.
Examples
The embodiment provides a satellite communication trunking service architecture, simplifies the realization of trunking base stations, is convenient to upgrade and realize on the existing trunking base stations (often satellite mobile communication base stations), meets the information security requirements of users, and designs the satellite mobile communication trunking service architecture.
Referring to fig. 4, the present invention relates to a trunking communication service architecture of a satellite mobile communication system, which comprises a carrier control system, a trunking controller, a trunking base station and a satellite terminal;
the operation control system plans cluster service channel resources for one or more cluster controllers according to task demands, and realizes the planning of the resources of the whole network system; according to the group operation condition reported by the cluster controller, dynamically generating a whole network cluster service resource plan comprising the current active cluster controller ID, the group ID and service channel resource allocation plan data, and issuing the whole network cluster service resource plan to the cluster controller; the operation control system combines task demand expansion to support whole network cluster resource planning and cluster physical channel switching planning on the basis of public service;
the cluster controller is used for managing the group and the resource planned by the operation control system and comprises call control, resource allocation, resource scheduling, message forwarding and group management functions; in a low-orbit satellite communication system, a plurality of cluster controllers can be configured to realize the management of different groups;
the cluster base station is used for processing a cluster service channel, and comprises channel modulation and demodulation, coding and decoding, service and control data forwarding; group calling access channel processing, identifying group calling access information from the general random access information, and forwarding the group calling access information to a corresponding cluster control satellite terminal controller; merging the cluster broadcasting message into a system broadcasting message and distributing the system broadcasting message;
the satellite terminal is used for realizing the setting and acquisition of the communication state by the terminal user and completing the communication.
Further, the cluster controller is configured at a gateway station or a service management station side.
Further, when the mobile communication satellite is of a transparent forwarding architecture, the cluster base station is deployed in a gateway station system and can be integrated on a gateway station base station processing platform; when the mobile communication satellite is a processing forwarding architecture, the cluster base station is deployed as software in an on-board cluster base station.
The embodiment also provides a trunking communication method of the satellite mobile communication system, which comprises a self-adaptive trunking service call flow and a low-orbit trunking communication plan switching flow.
Further, the self-adaptive cluster service call flow realizes that under the beam without cluster broadcast message distribution, the cluster group members trigger the network side to distribute the cluster broadcast message under the beam through autonomous call, thereby realizing the on-demand distribution of the cluster broadcast message and reducing the occupation of the cluster broadcast message to broadcast channel resources.
Further, in connection with fig. 5, the adaptive trunking service call flow includes the following steps:
step 1.1, a satellite terminal applies for group calling service to a certain cluster controller through a universal random access channel RACH, and after receiving a group calling service request message, a cluster base station forwards the message to a corresponding cluster controller according to a cluster controller ID carried in the message;
step 1.2, after receiving the cluster service request message, the cluster controller identifies the user identity according to the user ID and the cluster ID information;
step 1.3, the group members acquire the group broadcast message by monitoring the system broadcast message, and add the group broadcast message into the group service according to the resource and the group key information in the message;
step 1.4, the satellite terminal initiates disconnection by using an uplink disconnection command on a trunking service channel, the trunking controller judges the identity of the satellite terminal, if the trunking controller is a group leader or a manager, the trunking controller sends a disconnection command in the direction of a downlink broadcast channel, and after receiving the downlink disconnection command, all the satellite terminals under the channel leave the channel by themselves and enter an idle state to wait for the next call;
and 1.5, the cluster controller clears the resource configuration and key information of the current cluster group in the cluster group broadcast message, configures the message to the cluster base station, and updates the system broadcast information according to the latest cluster group broadcast message.
Further, after receiving the cluster service request message, the cluster controller in step 1.2 identifies the user identity according to the user ID and the cluster ID information, which is specifically as follows:
step 1.2.1, if the satellite terminal is a cluster group leader, the cluster controller distributes cluster service channel resources to the satellite terminal through a common channel AGCH; after receiving the trunking service channel resources, the satellite terminal realizes the trunking group length and network two-way authentication through the trunking service channel, and distributes corresponding group key information;
step 1.2.2, if the satellite terminal is a cluster group member, checking whether the current cluster group is activated (works on other satellites), if so, distributing cluster service channel resources for the satellite terminal, and forwarding group security key information; if the cluster group is not activated, rejecting the satellite terminal to access;
step 1.2.3, the cluster controller generates a cluster group broadcast message including a cluster group ID, cluster service channel resources and group security key information, and sends the message to a cluster base station; the trunking base station combines the trunking group broadcast message into a system broadcast message and broadcasts it to other satellite terminals.
Further, the low-orbit trunking communication plan switching flow integrates trunking user position, satellite ephemeris and whole network resource planning information to generate a trunking service resource list according to time slice sequence, and the trunking controller automatically configures the trunking service resource list to the satellite terminal and the trunking base station to realize the plan switching of trunking users.
Further, referring to fig. 6, the low-rail trunking communication plan switching process includes the following steps:
(1) Step 2.1, the operation control system periodically generates a whole network cluster service resource plan according to the whole network resource configuration, the area where the cluster users are located and the low orbit satellite ephemeris data, and respectively configures the whole network cluster service resource plan to corresponding cluster controllers; the cluster service resource plan of a certain cluster controller is shown in table 2:
table 2 exemplary cluster controller cluster service resource plan message format
Step 2.2, the cluster controller generates a cluster switching command according to the time of the cluster service resource plan, configures the cluster switching command to a cluster base station of a corresponding satellite, transmits the cluster switching command to a network cluster user through a cluster broadcasting channel, updates a cluster broadcasting message and transmits the cluster broadcasting message to the corresponding cluster base station; the cluster switch command is as shown in table 3:
table 3 exemplary cluster switch command message format
Step 2.3, the satellite receives the trunking switching command and trunking broadcasting message, and processes the two conditions of the internal beam switching of the satellite and the inter-satellite switching;
and 2.4, the satellite terminal acquires a cluster switching command through a cluster broadcast channel, and selects an optimal satellite beam for switching according to the command and the satellite terminal position.
Further, the satellite in step 2.3 receives the trunking switching command and the trunking broadcast message, and processes the trunking switching command and the trunking broadcast message in two cases of intra-satellite beam switching and inter-satellite switching, which are specifically as follows:
step 2.3.1, when the internal wave beam of the satellite is switched, after the trunking base station receives the trunking switching command, on one hand, before two frames before the activation time, the trunking switching command is broadcast through the trunking physical channel, on the other hand, the corresponding trunking physical channel resource information is validated on the target wave beam according to the time information, and the released source wave beam trunking channel resource is recovered; in addition, cluster broadcasting information is updated at the source beam and the target beam;
step 2.3.2, when switching between satellites, after the source satellite trunking base station receives the trunking switching command, on one hand, before two frames before the activation time, the trunking switching command is broadcast through the trunking physical channel, and on the other hand, the released trunking channel resources are recovered according to the time information; in addition, updating the cluster broadcasting information at the source satellite;
and after receiving the cluster switching command, the target satellite cluster base station takes effect of corresponding cluster physical channel resource information on the target beam according to the time information, and updates cluster broadcasting information on the target beam.
In summary, the satellite mobile communication cluster service architecture can support a plurality of independent cluster controllers in an expanding manner, so that the independent management and control application requirements of users on cluster information are met; the satellite trunking service architecture simplifies the implementation complexity of trunking base stations and reduces the coupling degree of the channel equipment functions of the existing satellite-borne base stations or gateway stations; the trunking service call flow can reduce occupation of the trunking broadcast message to a common control channel; the cluster handoff procedure may reduce the interaction procedure within the network during the low orbit satellite handoff control process.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The cluster communication service architecture of the satellite mobile communication system is characterized by comprising an operation control system, a cluster controller, a cluster base station and a satellite terminal, wherein:
the operation control system plans cluster service channel resources for one or more cluster controllers according to task demands, and realizes the planning of the resources of the whole network system; according to the group operation condition reported by the cluster controller, dynamically generating a whole network cluster service resource plan comprising the current active cluster controller ID, the group ID and service channel resource allocation plan data, and issuing the whole network cluster service resource plan to the cluster controller; the operation control system combines task demand expansion to support whole network cluster resource planning and cluster physical channel switching planning on the basis of public service;
the cluster controller is used for managing the group and the resource planned by the operation control system and comprises call control, resource allocation, resource scheduling, message forwarding and group management functions; in a low-orbit satellite communication system, a plurality of cluster controllers are configured to realize the management of different groups;
the cluster base station is used for processing a cluster service channel, and comprises channel modulation and demodulation, coding and decoding, service and control data forwarding; group calling access channel processing, identifying group calling access information from the general random access information, and forwarding the group calling access information to a corresponding cluster control satellite terminal controller; merging the cluster broadcasting message into a system broadcasting message and distributing the system broadcasting message;
the satellite terminal is used for realizing the setting and acquisition of the communication state by the terminal user and completing the communication.
2. The trunked communication service architecture of the satellite mobile communication system according to claim 1, wherein the trunked controller is configured at a gateway station or a service management station side.
3. The architecture of claim 1, wherein when the mobile communication satellite is a transparent forwarding architecture, the cluster base station is deployed in a gateway station system and integrated on a gateway station base station processing platform; when the mobile communication satellite is a processing forwarding architecture, the cluster base station deployment is deployed as software in an on-board cluster base station.
4. The trunking communication method of the satellite mobile communication system is characterized by comprising a self-adaptive trunking service call flow and a low-orbit trunking communication plan switching flow, and specifically comprises the following steps:
the self-adaptive cluster service call flow is as follows: under the beam distributed without the trunking broadcast message, the trunking group member triggers the network side to distribute the trunking broadcast message under the beam through autonomous calling, thereby realizing the on-demand distribution of the trunking broadcast message and reducing the occupation of the trunking broadcast message to the broadcast channel resource;
the low-rail trunking communication plan switching flow is as follows: and integrating the cluster user position, satellite ephemeris and full network resource planning information to generate a cluster service resource list according to time slice sequence, and automatically configuring a satellite terminal and a cluster base station by a cluster controller according to the cluster service resource configuration list to realize the planned switching of the cluster users.
5. The trunked communication method of the satellite mobile communication system according to claim 4, wherein the adaptive trunked service call procedure comprises the steps of:
step 1.1, a satellite terminal applies for group calling service to a certain cluster controller through a universal random access channel RACH, and after receiving a group calling service request message, a cluster base station forwards the message to a corresponding cluster controller according to a cluster controller ID carried in the message;
step 1.2, after receiving the cluster service request message, the cluster controller identifies the user identity according to the user ID and the cluster ID information;
step 1.3, the group members acquire the group broadcast message by monitoring the system broadcast message, and add the group broadcast message into the group service according to the resource and key configuration in the message;
step 1.4, the satellite terminal initiates disconnection by using an uplink disconnection command on a trunking service channel, the trunking controller judges the identity of the satellite terminal, if the trunking controller is a group leader or a manager, the trunking controller sends a disconnection command in the direction of a downlink broadcast channel, and after receiving the downlink disconnection command, all the satellite terminals under the channel leave the channel by themselves and enter an idle state to wait for the next call;
and 1.5, the cluster controller clears the resource configuration and key information of the current cluster group in the cluster group broadcast message, configures the message to the cluster base station, and updates the system broadcast information according to the latest cluster group broadcast message.
6. The trunking communication method of the satellite mobile communication system according to claim 5, wherein after receiving the trunking service request message, the trunking controller in step 1.2 recognizes the user identity according to the user ID and the trunking ID information, and specifically comprises the following steps:
step 1.2.1, if the satellite terminal is a cluster group leader, the cluster controller distributes cluster service channel resources to the satellite terminal through a common channel AGCH; after receiving the trunking service channel resources, the satellite terminal realizes the trunking group length and network two-way authentication through the trunking service channel, and distributes corresponding group key information;
step 1.2.2, if the satellite terminal is a cluster group member, checking whether the current cluster group is activated, if so, distributing cluster service channel resources for the satellite terminal when the satellite terminal works on other satellites, and forwarding group security key information; if the cluster group is not activated, rejecting the satellite terminal to access;
step 1.2.3, the cluster controller generates a cluster group broadcast message including a cluster group ID, cluster service channel resources and group security key information, and sends the message to a cluster base station; the trunking base station combines the trunking group broadcast message into a system broadcast message and broadcasts it to other satellite terminals.
7. The trunking communication method of the satellite mobile communication system of claim 6 wherein, in the adaptive trunking service call flow, when a trunking group member needs to send information such as voice, short message, and data, the PTT button on the terminal is pressed, the mobile terminal sends an uplink channel occupation request on the trunking access channel, the trunking controller sends an occupation confirmation signaling on the trunking broadcast channel in the downlink direction, the talker user who receives the signaling obtains the right to use the uplink channel, and other users cannot use the channel until the talker releases the uplink channel; when the PTT key is released, the mobile terminal transmits an uplink channel release signaling on the channel, and the cluster gateway station controller transmits an uplink idle signaling on the downlink channel; any user can press the PTT key to apply for uplink occupation and send uplink request signaling.
8. The trunking communication method of the satellite mobile communication system according to claim 4, wherein the low-orbit trunking communication plan switching procedure comprises the steps of:
step 2.1, the operation control system periodically generates a whole network cluster service resource plan according to the whole network resource configuration, the area where the cluster users are located and the low orbit satellite ephemeris data, and respectively configures the whole network cluster service resource plan to corresponding cluster controllers;
step 2.2, the cluster controller generates a cluster switching command according to the time of the cluster service resource plan, configures the cluster switching command to a cluster base station of a corresponding satellite, transmits the cluster switching command to a network cluster user through a cluster broadcasting channel, updates a cluster broadcasting message and transmits the cluster broadcasting message to the corresponding cluster base station;
step 2.3, the satellite receives the trunking switching command and trunking broadcasting message, and processes the two conditions of the internal beam switching of the satellite and the inter-satellite switching;
and 2.4, the satellite terminal acquires a cluster switching command through a cluster broadcast channel, and selects an optimal satellite beam for switching according to the command and the satellite terminal position.
9. The low-orbit trunking communication scheme switching process according to claim 8, wherein the satellite receiving trunking switching command and trunking broadcast message in step 2.3 is processed by two cases of intra-satellite beam switching and inter-satellite switching, specifically as follows:
step 2.3.1, when the internal wave beam of the satellite is switched, after the trunking base station receives the trunking switching command, on one hand, before two frames before the activation time, the trunking switching command is broadcast through the trunking physical channel, on the other hand, the corresponding trunking physical channel resource information is validated on the target wave beam according to the time information, and the released source wave beam trunking channel resource is recovered; in addition, cluster broadcasting information is updated at the source beam and the target beam;
and 2.3.2, when the satellites are switched, after the source satellite trunking base station receives the trunking switching command, on one hand, the trunking switching command is broadcast through the trunking physical channel before two frames before the activation time, and on the other hand, the released trunking channel resources are recovered according to the time information.
10. The low-rail trunked communication plan switching process of claim 9, wherein step 2.3.2 further comprises: updating cluster broadcasting information at a source satellite; and after receiving the cluster switching command, the target satellite cluster base station takes effect of corresponding cluster physical channel resource information on the target beam according to the time information, and updates cluster broadcasting information on the target beam.
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