CN114142910A - Cluster communication method and device of low-earth-orbit constellation satellite communication system - Google Patents
Cluster communication method and device of low-earth-orbit constellation satellite communication system Download PDFInfo
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Abstract
The invention discloses a cluster communication method of a low-orbit constellation satellite communication system, which comprises the following steps of setting a low-orbit cluster communication frame structure: aiming at the cluster communication service of the low-earth constellation satellite communication system, adding channel associated signaling on a service channel or an uplink shared channel, controlling a communication link and realizing the synchronization between a satellite terminal and a satellite; and (3) switching the low-rail cluster communication: the satellite terminal is switched in a base station under the same gateway station or among base stations under the same gateway station; in the switching process, the cluster controller selects the matched frequency resources from the global aspect to distribute, and the resource distribution and the switching negotiation between the cluster controller and the base station are realized. The invention adds a frame structure meeting the requirement of quick synchronization on a service channel, controls a link and realizes quick synchronization; and a communication flow between the cluster controller and the base station is also designed, and the functions of resource allocation, switching negotiation and the like between the cluster controller and the base station during cluster service are realized.
Description
Technical Field
The invention relates to the technical field of low-orbit constellation satellite communication, in particular to a cluster communication method and a cluster communication device of a low-orbit constellation satellite communication system.
Background
1. Low earth orbit satellite communication system
The low-orbit constellation satellite communication system is a satellite communication system for forwarding signals through a low-orbit constellation and has the characteristics of wide bandwidth, global coverage, low time delay and the like. Currently, low-orbit constellation satellite communication systems which are built or put into operation in the world mainly comprise Iridium, GlobalStar, starlink, O3B, OneWeb, Telesat and the like, and although China also has low-orbit systems such as rainbow cloud, swan and the like, the low-orbit constellation satellite communication systems are still in the initial stage of construction. Generally, a low earth constellation satellite communication system is composed of three parts, namely a space section, a ground section and an application section, as shown in fig. 1:
(1) space segment
The space segment is comprised of a constellation of low orbit satellites. The satellite constellation is a collection of satellites which can normally work when being launched into orbit, and is generally a satellite network formed by a plurality of satellite rings which are configured in a certain mode. The low-orbit satellite constellation is a low-orbit satellite network composed of a plurality of low-orbit satellites, and performs information transmission with a ground gateway station through a feeder link, as shown in fig. 2.
(2) Ground segment
The ground segment is used as an important component of the low-earth constellation satellite communication system, completes the functions of satellite load management, service processing, network management, operation management, cross-country service settlement and the like of the low-earth constellation satellite communication system, is responsible for interconnection and intercommunication of the low-earth 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 parts of the world.
a) Operation control center
The operation control center is an operation control center for short, is a core component and a management center of operation and maintenance control of the low-earth constellation satellite communication system, provides a centralized, unified, comprehensive and automatic platform for system control and application management, and ensures safe, stable and reliable operation of a constellation and ground gateway station network. The system mainly completes the functions of satellite load management, satellite-ground resource operation condition and satellite-ground feeder link state monitoring, gateway station system task planning and the like.
b) Global operation service center
The global operation service center is an important part for supporting the global operation of the satellite communication system with low earth orbit constellation. The global operation service center is connected with the comprehensive network management and operation support system of each country, mainly completes the functions of global settlement, gateway station network monitoring and the like, and ensures the safe and stable operation of the global network.
c) Gateway station system
The gateway station system provides services such as communication, service, operation, management and the like for the low earth constellation satellite communication system, and has the functions of system resource management, user authentication and encryption, service routing and exchange, service, local network operation and the like. The satellite communication system mainly comprises gateway stations deployed in various station building countries or regions and communication networks among the gateway stations, and is a main ground facility of the satellite communication system with the low-earth constellation. Generally, radio frequency front-end equipment and baseband protocol processing equipment of a gateway station are called base station equipment, and each low-earth orbit satellite corresponds to one set of base station equipment. The low-orbit constellation satellite communication system is interconnected and intercommunicated with the ground PLMN, PSTN, Internet and other private networks through the gateway station. The gateway station transmits information with the low earth orbit satellite through the feeder link.
(3) Application segment
The application section is composed of various fixed and mobile terminals distributed in the coverage range of low earth orbit constellation wave beams, the terminals are portals and application platforms of users accessing a low earth orbit constellation satellite communication system and are used for establishing data transmission links between the users and the satellites, and each terminal has the switching capacity among the wave beams, the satellites and the gateway stations and can provide continuous service for the users. The end user communicates with the low earth orbit satellite via a user link.
2. Problems with low earth orbit constellation satellite communication systems
Low earth constellation satellite communication systems are different from conventional high earth constellation satellite communication systems. The movement speed of the low-orbit constellation satellite can reach 7000 km/s, and the communication elevation angle and distance from the satellite terminal to the low-orbit satellite change rapidly, so that the dynamic range of a user link is large. The coverage area of the low-orbit satellite is small, communication services of the satellite terminal need to be completed through a plurality of satellite relay services, and meanwhile, the low-orbit satellite needs to maintain signal landing and interconnection and intercommunication with a ground communication system through relay switching among a plurality of gateway stations.
3. Cluster communication
The trunking communication system is a radio mobile communication system which realizes multi-user sharing of multiple channels according to a dynamic channel assignment mode, generally comprises terminal equipment, a base station, a central control station and the like, and has the functions of scheduling, trunking, preferential calling, virtual private network, roaming and the like. The trunking communication system is mainly applied to a professional mobile communication system, and is a mobile communication system for group dispatching and commanding communication. The system has available channels which can be shared by all users of the system, and is a multipurpose and high-performance wireless dispatching communication system for sharing resources, sharing cost, sharing channel equipment and services.
The most characteristic of the cluster communication is that the communication adopts PTT (push To talk) and is connected in a one-click instant communication mode, the called party can answer without off-hook, the connection speed is high, and the cluster communication can support the functions of group calling and the like. The operation mode of the cluster communication is mainly simplex and half-duplex, the mode of channel dynamic allocation is mainly adopted, and users have different priorities and special functions, and can respond all together when in communication. The cluster communication is realized by sharing common communication resources among all users, and the use efficiency of frequency resources is greatly improved. The general communication flow of the trunking communication is shown in fig. 3, and the state machine of the trunking communication satellite terminal is shown in fig. 4.
4. Handover
The switching of the low earth constellation satellite communication system is divided into user link switching and feeder link switching, fig. 5(a) and (b) are schematic diagrams of user link switching of the satellite terminal, and fig. 6 is a schematic diagram of low earth constellation satellite feeder link switching.
However, the existing trunking technology is based on terrestrial mobile communication and high-orbit satellite communication systems, and is not suitable for low-orbit constellation satellite communication systems. The low-earth-orbit constellation satellite has high speed, the change rate of time bias frequency offset is high, the communication link is highly dynamically changed, and the synchronization problem between the satellite terminal and the satellite running at high speed needs to be solved urgently. In addition, the coverage of the low-orbit satellite beam is small, a mode of relaying by a plurality of low-orbit satellites is needed to maintain the smooth user link of the satellite terminal, and the satellite also needs to be switched among different gateway stations to ensure the grounding of a feed signal.
Disclosure of Invention
The invention aims to provide a cluster communication method and a cluster communication device of a low-orbit constellation satellite communication system, which are used for meeting the switching requirement of low-orbit cluster communication services.
The technical solution for realizing the purpose of the invention is as follows: a cluster communication method of a low-orbit constellation satellite communication system comprises the following steps of setting a low-orbit cluster communication frame structure: aiming at the cluster communication service of the low-earth constellation satellite communication system, adding channel associated signaling on a service channel or an uplink shared channel, and controlling a communication link so as to realize the synchronization between a satellite terminal and a satellite; and (3) switching the low-rail cluster communication: the satellite terminal is switched in a base station under the same gateway station or among base stations under the same gateway station; in the switching process, the cluster controller selects matched frequency resources from the global aspect to distribute, and resource distribution and switching negotiation between the cluster controller and the base station are realized during cluster service.
Further, the channel associated signaling is added to the traffic channel or the uplink shared channel, and a format of a frame of the channel associated signaling is shown in table 1:
table 1 low-rail cluster communication frame structure
Further, table 1 in the low-orbit cluster communication frame structure:
the synchronous head is calculated and determined according to the coverage range of the low-orbit satellite beam, the larger the beam range is, the larger the dynamic range from the beam center point to the beam edge is, and the longer the synchronous head is designed; on the contrary, the smaller the beam range is, the smaller the dynamic range from the beam center point to the beam edge is, and the shorter the synchronous head is designed;
the cluster parameters include a cluster group ID, and a monologue indication of whether recently requested or in progress;
the cluster broadcast message comprises a cluster shared channel resource parameter and a listening indication parameter;
the guard interval has the function of avoiding the interference of two adjacent frames when the synchronization is not completed;
the link control word is a relevant channel parameter used by the gateway station to inform the terminal to transmit data in an uplink channel;
the random access request is a cluster independent signaling which is sent by a satellite terminal and is triggered when a cluster independent user presses a PTT button;
the monologue data packet is voice, data or picture information sent by the clustered monologue users.
Further, when the satellite terminal is switched between beams under the same base station during trunking service, the flow between the trunking controller and the base station is as follows:
1.1) when a base station judges that a satellite terminal needs to be switched, sending a request to a cluster controller, and beginning to negotiate with the cluster controller;
1.2) the cluster controller judges which beam the satellite terminal needs to switch to according to the position information, the beam information and the occupied resource condition of the satellite terminal, and allocates wireless resources in advance according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
1.3) the cluster controller informs the base station of the allocated radio resource condition and informs the base station of allowing the switching;
1.4) carrying out a switching process between the base station and the satellite terminal.
Further, when the satellite terminal is switched between beams under different base stations during trunking service, the flow between the trunking controller and the base stations is as follows:
2.1) when the base station judges that the satellite terminal needs to be switched, sending a request to the cluster controller, and starting to negotiate with the cluster controller;
2.2) the cluster controller judges which beam under the target base station the satellite terminal needs to switch to according to the position information, the beam information and the resource occupation condition of the satellite terminal, and allocates wireless resources in advance according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
2.3) the cluster controller informs the target base station of the allocated wireless resource condition, and the target base station starts to perform switching preparation work;
2.4) the target base station performs preparation work including resource pre-allocation, and the target base station informs the cluster controller after the target base station performs switching preparation;
2.5) after receiving the switching response of the target base station, the cluster controller sends the switching response to the source base station to inform the source base station that the switching is allowed;
and 2.6) after the source base station receives the switching response, starting switching processes among the source base station, the target base station and the satellite terminal.
A trunking communication device of a low-orbit constellation satellite communication system is composed of a low-orbit constellation satellite, a base station, a satellite terminal, a shared channel and a trunking controller, wherein the satellite terminal participates in trunking communication service through the shared channel, and the shared channel supports multiple protocol operations; the device adopts the cluster communication method to carry out communication.
Compared with the prior art, the invention has the following remarkable advantages: (1) according to the characteristics of a low-earth-orbit satellite communication system, aiming at the cluster communication service, a frame structure meeting the requirement of quick synchronization is added on a service channel, and a link is controlled to realize quick synchronization; (2) aiming at the low-orbit cluster communication service, a communication flow between a cluster controller and a base station is designed, and the functions of resource allocation, switching negotiation and the like between the cluster controller and the base station during the cluster service are realized.
Drawings
Fig. 1 is a schematic diagram of a low earth constellation satellite communication system.
Fig. 2 is a schematic diagram of a low-orbit constellation.
Fig. 3 is a cluster communication flow diagram.
Fig. 4 is a schematic diagram of a satellite terminal cluster state machine.
Fig. 5 is a schematic diagram of a user link handoff of a satellite terminal, wherein (a) is a schematic diagram of an intra-satellite handoff and (b) is a schematic diagram of an inter-satellite handoff.
Fig. 6 is a schematic diagram of feeder link switching.
Fig. 7 is a schematic diagram of the inter-beam handover procedure in the same base station.
Fig. 8 is a schematic diagram of an inter-beam handover procedure in different base stations.
Detailed Description
The invention discloses a cluster communication method of a low-orbit constellation satellite communication system, which comprises the following steps of setting a low-orbit cluster communication frame structure: aiming at the cluster communication service of the low-earth constellation satellite communication system, adding channel associated signaling on a service channel or an uplink shared channel, and controlling a communication link so as to realize the synchronization between a satellite terminal and a satellite; and (3) switching the low-rail cluster communication: the satellite terminal is switched in a base station under the same gateway station or among base stations under the same gateway station; in the switching process, the cluster controller selects matched frequency resources from the global aspect to distribute, and resource distribution and switching negotiation between the cluster controller and the base station are realized during cluster service.
Further, the channel associated signaling is added to the traffic channel or the uplink shared channel, and a format of a frame of the channel associated signaling is shown in table 1:
table 1 low-rail cluster communication frame structure
Further, table 1 in the low-orbit cluster communication frame structure:
the synchronous head is calculated and determined according to the coverage range of the low-orbit satellite beam, the larger the beam range is, the larger the dynamic range from the beam center point to the beam edge is, and the longer the synchronous head is designed; on the contrary, the smaller the beam range is, the smaller the dynamic range from the beam center point to the beam edge is, and the shorter the synchronous head is designed;
the cluster parameters include a cluster group ID, and a monologue indication of whether recently requested or in progress;
the cluster broadcast message comprises a cluster shared channel resource parameter and a listening indication parameter;
the guard interval has the function of avoiding the interference of two adjacent frames when the synchronization is not completed;
the link control word is a relevant channel parameter used by the gateway station to inform the terminal to transmit data in an uplink channel;
the random access request is a cluster independent signaling which is sent by a satellite terminal and is triggered when a cluster independent user presses a PTT button;
the monologue data packet is voice, data or picture information sent by the clustered monologue users.
Further, when the satellite terminal is switched between beams under the same base station during trunking service, the flow between the trunking controller and the base station is as follows:
1.1) when a base station judges that a satellite terminal needs to be switched, sending a request to a cluster controller, and beginning to negotiate with the cluster controller;
1.2) the cluster controller judges which beam the satellite terminal needs to switch to according to the position information, the beam information and the occupied resource condition of the satellite terminal, and allocates wireless resources in advance according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
1.3) the cluster controller informs the base station of the allocated radio resource condition and informs the base station of allowing the switching;
1.4) carrying out a switching process between the base station and the satellite terminal.
Further, when the satellite terminal is switched between beams under different base stations during trunking service, the flow between the trunking controller and the base stations is as follows:
2.1) when the base station judges that the satellite terminal needs to be switched, sending a request to the cluster controller, and starting to negotiate with the cluster controller;
2.2) the cluster controller judges which beam under the target base station the satellite terminal needs to switch to according to the position information, the beam information and the resource occupation condition of the satellite terminal, and allocates wireless resources in advance according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
2.3) the cluster controller informs the target base station of the allocated wireless resource condition, and the target base station starts to perform switching preparation work;
2.4) the target base station performs preparation work including resource pre-allocation, and the target base station informs the cluster controller after the target base station performs switching preparation;
2.5) after receiving the switching response of the target base station, the cluster controller sends the switching response to the source base station to inform the source base station that the switching is allowed;
and 2.6) after the source base station receives the switching response, starting switching processes among the source base station, the target base station and the satellite terminal.
A trunking communication device of a low-orbit constellation satellite communication system is composed of a low-orbit constellation satellite, a base station, a satellite terminal, a shared channel and a trunking controller, wherein the satellite terminal participates in trunking communication service through the shared channel, and the shared channel supports multiple protocol operations; the device adopts the cluster communication method to carry out communication.
The invention is described in further detail below with reference to the figures and the embodiments.
Examples
The low-orbit trunking communication system of the embodiment is composed of a low-orbit constellation satellite, a base station, a satellite terminal and a shared channel, wherein the satellite terminal participates in trunking communication services through the shared channel, and the shared channel supports multiple protocol operations. The system broadcast message is transmitted to the cluster users, provides the cluster users with the capabilities of applying for, synchronizing, transmitting the independent voice and listening to the voice, and can also allocate a special shared channel for the cluster users through resource allocation.
1. Low-rail cluster communication frame structure
Because the low-orbit satellite has low orbit height and high speed, the traditional satellite communication frame structure can not meet the requirement of the low-orbit satellite communication on quick synchronization. Aiming at the cluster communication service of the low-earth constellation satellite communication system, a channel associated signaling needs to be added on a normal service channel or an uplink shared channel to control a communication link and realize a quick synchronization mechanism.
The channel associated signaling frame format is shown in table 1:
table 1 trunking communication frame structure
The synchronous head can be determined according to the coverage calculation of the low orbit satellite beam, the larger the beam range is, the larger the dynamic range from the beam center point to the beam edge is, the longer the synchronous head needs to be designed, otherwise, the smaller the beam range is, the smaller the dynamic range from the beam center point to the beam edge is, and the shorter the synchronous head can be designed.
The cluster parameters include parameters such as the cluster group ID, and whether a request was recently made or a monologue is in progress.
The cluster broadcast message includes parameters such as cluster shared channel resource parameters, listening indication, etc.
The interval exists to avoid interference of two adjacent frames when synchronization is not completed.
The link control word is a relevant channel parameter used by the gateway station to inform the terminal to transmit data in the uplink channel.
The random access request is cluster single-white signaling sent by a satellite terminal triggered when a cluster single-white user presses a PTT button.
The monologue data packet is information such as voice, data or pictures sent by the cluster monologue users.
2. Low-rail cluster communication switching process
The low-orbit satellite has small beam coverage and high operation speed, a user link of the satellite terminal is kept smooth in a mode of relay of a plurality of low-orbit satellites, and the satellite also needs to switch a feed link among different gateway stations to ensure that a feed signal falls to the ground. Due to the dispersion of cluster users, in the switching process, the cluster controller needs to select a proper frequency resource from the global aspect for allocation, and complete resource coordination with the base station. The general trunking users have regionality, and all the trunking users are generally in the belonging range of the same gateway station, so that only the condition that the satellite terminal is switched in the base station under the same gateway station or between the base stations under the same gateway station is considered. The flow between the cluster controller and the base station is as follows.
a) When switching between beams of a satellite terminal under the same base station occurs during trunking service, the flow design between the trunking controller and the base station is shown in fig. 7:
1) when the base station judges that the satellite terminal needs to be switched, a request is sent to the cluster controller, and negotiation with the cluster controller is started;
2) the cluster controller judges which beam the satellite terminal needs to be switched to according to the position information, the beam information and the resource occupation condition of the satellite terminal and pre-allocates wireless resources according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
3) the cluster controller informs the base station of the allocated radio resource condition and informs the base station of allowing the switching;
4) and carrying out a normal switching process between the base station and the satellite terminal.
b) When the satellite terminal is switched among beams under different base stations during trunking service, the flow design between the trunking controller and the base stations is as shown in fig. 8:
1) when the base station judges that the satellite terminal needs to be switched, a request is sent to the cluster controller, and negotiation with the cluster controller is started;
2) the cluster controller judges which beam under a target base station the satellite terminal needs to be switched to according to the position information, the beam information and the resource occupation condition of the satellite terminal and pre-allocates wireless resources according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
3) the cluster controller informs the target base station of the allocated wireless resource condition, and the target base station starts to perform switching preparation work;
4) the target base station performs preparation work such as resource pre-allocation, and notifies the cluster controller after the target base station prepares for switching;
5) after receiving the switching response of the target base station, the cluster controller sends the switching response to the source base station to inform the source base station that the switching is allowed;
6) and after the source base station receives the switching response, the source base station, the target base station and the satellite terminal start to carry out a normal switching process.
According to the characteristics of the low-earth-orbit satellite communication system, aiming at the cluster communication service, the invention adds a frame structure meeting the requirement of quick synchronization on a service channel, controls the link and realizes the quick synchronization. In addition, the invention designs a communication flow between the cluster controller and the base station aiming at the low-orbit cluster communication service, and realizes the functions of resource allocation, switching negotiation and the like between the cluster controller and the base station during the cluster service.
Claims (6)
1. A cluster communication method of a low earth constellation satellite communication system includes,
setting a low-orbit cluster communication frame structure: aiming at the cluster communication service of the low-earth constellation satellite communication system, adding channel associated signaling on a service channel or an uplink shared channel, and controlling a communication link so as to realize the synchronization between a satellite terminal and a satellite;
and (3) switching the low-rail cluster communication: the satellite terminal is switched in a base station under the same gateway station or among base stations under the same gateway station; in the switching process, the cluster controller selects matched frequency resources from the global aspect to distribute, and resource distribution and switching negotiation between the cluster controller and the base station are realized during cluster service.
2. The trunking communication method of the low earth orbit constellation satellite communication system of claim 1, wherein the channel associated signaling is added to the traffic channel or the uplink shared channel, and a format of a frame of the channel associated signaling is shown in table 1:
table 1 low-rail cluster communication frame structure
3. The method of claim 2, wherein the low-earth constellation communication frame structure in table 1 is:
the synchronous head is calculated and determined according to the coverage range of the low-orbit satellite beam, the larger the beam range is, the larger the dynamic range from the beam center point to the beam edge is, and the longer the synchronous head is designed; on the contrary, the smaller the beam range is, the smaller the dynamic range from the beam center point to the beam edge is, and the shorter the synchronous head is designed;
the cluster parameters include a cluster group ID, and a monologue indication of whether recently requested or in progress;
the cluster broadcast message comprises a cluster shared channel resource parameter and a listening indication parameter;
the guard interval has the function of avoiding the interference of two adjacent frames when the synchronization is not completed;
the link control word is a relevant channel parameter used by the gateway station to inform the terminal to transmit data in an uplink channel;
the random access request is a cluster independent signaling which is sent by a satellite terminal and is triggered when a cluster independent user presses a PTT button;
the monologue data packet is voice, data or picture information sent by the clustered monologue users.
4. The trunking communication method of the low earth orbit constellation satellite communication system of claim 1, wherein when the satellite terminal is switched between beams under the same base station during trunking service, the flow between the trunking controller and the base station is as follows:
1.1) when a base station judges that a satellite terminal needs to be switched, sending a request to a cluster controller, and beginning to negotiate with the cluster controller;
1.2) the cluster controller judges which beam the satellite terminal needs to switch to according to the position information, the beam information and the occupied resource condition of the satellite terminal, and allocates wireless resources in advance according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
1.3) the cluster controller informs the base station of the allocated radio resource condition and informs the base station of allowing the switching;
1.4) carrying out a switching process between the base station and the satellite terminal.
5. The trunking communication method of the low earth orbit constellation satellite communication system of claim 1, wherein when the satellite terminal switches between beams under different base stations during trunking service, the flow between the trunking controller and the base stations is as follows:
2.1) when the base station judges that the satellite terminal needs to be switched, sending a request to the cluster controller, and starting to negotiate with the cluster controller;
2.2) the cluster controller judges which beam under the target base station the satellite terminal needs to switch to according to the position information, the beam information and the resource occupation condition of the satellite terminal, and allocates wireless resources in advance according to the resource use condition under the beam; the resource allocation principle is that all satellite terminals under the same beam use the same wireless shared channel when carrying out the trunking service;
2.3) the cluster controller informs the target base station of the allocated wireless resource condition, and the target base station starts to perform switching preparation work;
2.4) the target base station performs preparation work including resource pre-allocation, and the target base station informs the cluster controller after the target base station performs switching preparation;
2.5) after receiving the switching response of the target base station, the cluster controller sends the switching response to the source base station to inform the source base station that the switching is allowed;
and 2.6) after the source base station receives the switching response, starting switching processes among the source base station, the target base station and the satellite terminal.
6. A trunking communication device of a low-orbit constellation satellite communication system is characterized in that the device is composed of a low-orbit constellation satellite, a base station, a satellite terminal, a shared channel and a trunking controller, wherein the satellite terminal participates in trunking communication service through the shared channel, and the shared channel supports multiple protocol operations; the device adopts the cluster communication method of any claim 1-5 to communicate.
Priority Applications (1)
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| CN115065999A (en) * | 2022-04-14 | 2022-09-16 | 重庆大学 | Network vertical switching method combining service diversity and terminal preference |
| CN115361055A (en) * | 2022-08-16 | 2022-11-18 | 中国科学院上海微系统与信息技术研究所 | Satellite communication system inter-satellite switching method based on user group |
| CN115913329A (en) * | 2022-11-04 | 2023-04-04 | 中电防务科技有限公司 | Wireless resource allocation method for satellite mobile communication system |
| CN116366138A (en) * | 2023-04-13 | 2023-06-30 | 军事科学院系统工程研究院网络信息研究所 | Elastic anti-destruction architecture of satellite communication multilayer core network and implementation method |
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