CN111132250A - Non-ground network switching method and system without terminal positioning capability - Google Patents
Non-ground network switching method and system without terminal positioning capability Download PDFInfo
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- CN111132250A CN111132250A CN201911357950.9A CN201911357950A CN111132250A CN 111132250 A CN111132250 A CN 111132250A CN 201911357950 A CN201911357950 A CN 201911357950A CN 111132250 A CN111132250 A CN 111132250A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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Abstract
The invention provides a non-ground network switching method and system without positioning capability of a terminal, comprising the following steps: step M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node; step M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information; step M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node; the invention solves the problem of switching a large number of terminals without positioning capability in a 5G, B5G mobile communication system with the integration of a ground network and a non-ground network.
Description
Technical Field
The invention relates to the field of Non-terrestrial networks (NTN), in particular to a Non-terrestrial network switching method and system without positioning capability of a terminal.
Background
With the increasing maturity of 5G (fifth generation mobile communication system) technology, the convergence of non-terrestrial communication platforms represented by satellites and terrestrial communication networks draws more and more attention, and the international standardization organization including 3GPP (third generation mobile communication partnership project) and ITU (international telecommunication union) has established a special working group to address the standardization problem of satellite-to-ground convergence, and the industry enterprises and the research organizations are also involved in the research work of satellite-to-ground integration.
Taking 3GPP (third generation partnership project) as an example, research work for satellite-to-ground fusion is being carried out starting from R14 (release 14). In a research project named "5G new air interface in' Non-terrestrial network oriented" by 3GPP (third generation mobile communication partnership project), a deployment scenario of a Non-terrestrial network (NTN) including a satellite network is defined. As one of the multiple access technologies of 5G (fifth generation mobile communication system) and B5G (last 5G mobile communication system), a satellite can provide a low-cost coverage scheme in a region with weak ground network coverage, and has a significant advantage in some industrial application scenarios requiring wide-area coverage.
According to the definition of 3GPP, the NTN application scenario in the 5G network includes 8 enhanced mobile broadband (eMBB) scenarios and 2 large-scale machine type communication (mtc) scenarios. In a large-scale machine type communication scene, the terminal type is mainly low-cost Internet of things terminals. Compared with the terminal of the enhanced mobile broadband scene, the terminal of the internet of things has the core characteristics of low cost and low processing capacity. 5G, B5G mobile broadband communication system, the deployment density of the low-cost internet of things terminal is several times or even tens times that of the enhanced mobile broadband terminal.
The internet of things terminal with low cost and low processing capacity as core characteristics and even a part of enhanced mobile broadband terminals often do not have positioning capacity; the original ground network switching process, especially the system behaviors such as measurement execution and reporting, form a serious challenge for the terminal to cooperate with the network to execute and complete related tasks.
Compared with terrestrial networks, the coverage area of a non-terrestrial network cell is large, and a single cell comprises a large number of terminals. When relative motion occurs between the non-ground network communication platform and the ground, cell information changes frequently, and a large number of terminals initiate a mobility management process in a short time. In 5G and B5G networks, the maximum terminal movement speed supported by the non-terrestrial network can reach 1200 km/h, and the extremely high movement speed of the terminal further increases the switching frequency. Frequent handovers may result in a large amount of signaling overhead, causing increased power consumption of the terminal and the satellite, and deteriorating mobility-related management performance.
In view of the wide application of the non-terrestrial network in the 5G and the 5G mobile communication systems, the convergence between the non-terrestrial network and the terrestrial network is the development direction of the future 5G, B5G mobile communication system, and is also a technical problem that must be solved. At present, in the 5G, B5G mobile communication system, the integration of the terrestrial network and the non-terrestrial network, especially the handover problem of the mobile terminal without positioning capability, has not been a complete and feasible solution.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a non-terrestrial network switching method and system without positioning capability of a terminal.
The invention provides a non-ground network switching method without positioning capability for a terminal, which comprises the following steps:
step M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node;
step M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information;
step M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node;
the candidate airborne communication node is an airborne communication node that is located around the source airborne communication node and that receives a request for spatial information from the source airborne communication node.
Preferably, the step M1 includes: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area according to the spatial position, the movement speed and the movement direction information of the source air communication node; when the service provided by the source air communication node to the terminal in the service geographic area is interrupted, the source air communication node initiates a network side switching process;
the network side switching process comprises a switching process initiated by a source air communication node from the network side;
the periodicity of the calculation depends on the coverage area including the source air communication node and the number of serving terminals;
the source aerial communication nodes comprise medium orbit satellites, low orbit satellites, unmanned aerial vehicles and lift-off hot air balloons.
Preferably, the step M2 includes:
the space information request sent by the source aerial communication node comprises the identification, the current position, the movement speed and the movement direction information of the source aerial communication node;
the space information fed back by the candidate aerial communication nodes comprises the identification, the current position, the motion speed and the motion direction information of the candidate aerial communication nodes;
preferably, the step M3 includes:
step M3.1: a source air communication node sends a switching request to a target air communication node through a communication interface between the air communication nodes;
step M3.2: after the target air communication node receives the switching request sent by the source air communication node, the target air communication node executes resource access control and allocates air interface resources and service bearing resources for the access of the ground terminal of the service area;
step M3.3: the target air communication node providing handover information to the source air communication node as a handover confirmation;
step M3.4: informing the ground terminal of the service area of switching to the switching command information of the target air communication node in a broadcasting mode;
step M3.5: after receiving the switching command information, the service area ground terminal switches the communication connection to a target air communication node;
the handover request includes context information for a ground terminal served by a source air communication node; the method comprises the steps of identity ID of a ground terminal, safety information, the number of ground terminals served by a source air communication node, space density and service type;
the switching information comprises a target aerial communication node ID, a carrier frequency, a target power, a wireless resource and a physical resource configuration;
the switching command information comprises a target aerial communication node ID, all information required by accessing the target aerial communication node, competitive and non-competitive random access information, service interruption time of a source aerial communication node and service starting time of the target aerial communication node;
preferably, said step M3.5 comprises: the ground terminal in the service area receives the switching command information periodically, and the periodic interval for receiving the broadcast information is obtained according to the preset, the arrangement after deployment and/or the initial intervention information of the non-ground network.
The invention provides a non-ground network switching system without terminal positioning capability, which comprises:
module M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node;
module M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information;
module M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node;
the candidate airborne communication node is an airborne communication node that is located around the source airborne communication node and that receives a request for spatial information from the source airborne communication node.
Preferably, said module M1 comprises: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area according to the spatial position, the movement speed and the movement direction information of the source air communication node; when the service provided by the source air communication node to the terminal in the service geographic area is interrupted, the source air communication node initiates a network side switching process;
the network side switching process comprises a switching process initiated by a source air communication node from the network side;
the periodicity of the calculation depends on the coverage area including the source air communication node and the number of serving terminals;
the source aerial communication nodes comprise medium orbit satellites, low orbit satellites, unmanned aerial vehicles and lift-off hot air balloons.
Preferably, said module M2 comprises:
the space information request sent by the source aerial communication node comprises the identification, the current position, the movement speed and the movement direction information of the source aerial communication node;
the space information fed back by the candidate aerial communication nodes comprises the identification, the current position, the motion speed and the motion direction information of the candidate aerial communication nodes;
preferably, said module M3 comprises:
module M3.1: a source air communication node sends a switching request to a target air communication node through a communication interface between the air communication nodes;
module M3.2: after the target air communication node receives the switching request sent by the source air communication node, the target air communication node executes resource access control and allocates air interface resources and service bearing resources for the access of the ground terminal of the service area;
module M3.3: the target air communication node providing handover information to the source air communication node as a handover confirmation;
module M3.4: informing the ground terminal of the service area of switching to the switching command information of the target air communication node in a broadcasting mode;
module M3.5: after receiving the switching command information, the service area ground terminal switches the communication connection to a target air communication node;
the handover request includes context information for a ground terminal served by a source air communication node; the method comprises the steps of identity ID of a ground terminal, safety information, the number of ground terminals served by a source air communication node, space density and service type;
the switching information comprises a target aerial communication node ID, a carrier frequency, a target power, a wireless resource and a physical resource configuration;
the switching command information comprises a target aerial communication node ID, all information required by accessing the target aerial communication node, competitive and non-competitive random access information, service interruption time of a source aerial communication node and service starting time of the target aerial communication node;
preferably, said module M3.5 comprises: the ground terminal in the service area receives the switching command information periodically, and the periodic interval for receiving the broadcast information is obtained according to the preset, the arrangement after deployment and/or the initial intervention information of the non-ground network.
Compared with the prior art, the invention has the following beneficial effects:
1. the problem of switching a large number of terminals without positioning capability in a 5G, B5G mobile communication system with the integration of a ground network and a non-ground network is solved.
2. The signaling overhead in the switching process of the terminal without the positioning capability in the fusion system of the ground network and the non-ground network is reduced, and the processing load of the non-ground communication platform is reduced.
3. The reliability and robustness of the switching process of the terminal without the positioning capability in the fusion system of the ground network and the non-ground network are improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of a non-terrestrial network handover method for a terminal without positioning capability, taking an LEO satellite as an example;
FIG. 2 is a flow chart of a non-terrestrial network handover method in which a terminal has no location capability;
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The present invention is applicable to a mobile broadband communication system in which a non-terrestrial communication platform represented by 5G (fifth generation mobile communication system) and B5G (last 5G mobile communication system) is integrated with a terrestrial communication network.
The invention aims to solve the problem of the convergence of a terrestrial network and a non-terrestrial network in a 5G, B5G mobile communication system, in particular the switching of a mobile terminal without positioning capability, and has no complete and feasible solution.
In an application scenario of 5G, B5G fusion of a ground network and a non-ground network, a large number of terminals without positioning capability represented by internet of things terminals with core characteristics of low cost, low power consumption and low processing capability exist. The original ground network switching process, especially the system behaviors such as measurement execution and reporting, form a serious challenge for the terminal to cooperate with the network to execute and complete related tasks.
In a 5G, B5G fusion system architecture of a ground network and a non-ground network, frequent switching of a large number of terminals without positioning capability may cause a large amount of signaling overhead, and a large number of terminals initiate a mobility management process in a short time, which causes the increase of power consumption of the terminals and satellites and deteriorates mobility-related management performance.
Aiming at the problem of switching of non-terrestrial networks in 5G and B5G mobile communication systems, the invention provides a non-terrestrial network switching method without positioning capability of a terminal.
The method is directed to a terminal without location capability. The method is not suitable for application scenes that a non-ground service network is formed by only a single air communication node, two or more air communication nodes are far away, or the service starting time of the air communication nodes is uncertain.
Through the information of spatial position, movement speed, movement direction and the like, the air communication node calculates the service duration and service interruption time of the terminal in a certain service geographic area. And in a broadcast information mode, the air communication node informs all terminals without positioning capability in the area of service duration and interruption time and a target air communication node for switching. The terminal without the positioning capability receives the broadcast information periodically, and is switched to the target air communication node after the service of the source air communication node is interrupted.
The invention provides a non-ground network switching method without positioning capability for a terminal, which comprises the following steps:
step M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node;
specifically, the step M1 includes: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area according to the spatial position, the movement speed and the movement direction information of the source air communication node; when the source air communication node foresees that the service provided by the source air communication node to a terminal in a certain service geographic area is interrupted after a certain time, the source air communication node initiates a network side switching process;
the network side switching process comprises a switching process initiated by a source air communication node from the network side;
the method is suitable for all types of aerial communication nodes which move relative to the ground terminal, including but not limited to MEO (medium orbit) satellites, LEO (low orbit) satellites, unmanned aerial vehicles, lift-off hot air balloons and the like.
The periodicity of the calculation depends on the coverage area including the source air communication node and the number of serving terminals;
step M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information;
the candidate airborne communication node is an airborne communication node that is located around the source airborne communication node and that receives a request for spatial information from the source airborne communication node.
Specifically, the step M2 includes:
the space information request sent by the source aerial communication node comprises the identification, the current position, the movement speed and the movement direction information of the source aerial communication node;
the space information fed back by the candidate aerial communication nodes comprises the identification, the current position, the motion speed and the motion direction information of the candidate aerial communication nodes;
step M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node;
specifically, the step M3 includes:
step M3.1: a source air communication node sends a switching request to a target air communication node through a communication interface between the air communication nodes;
step M3.2: after the target air communication node receives the switching request sent by the source air communication node, the target air communication node executes resource access control and allocates air interface resources and service bearing resources for the access of the ground terminal of the service area;
step M3.3: the target air communication node providing handover information to the source air communication node as a handover confirmation;
step M3.4: informing the ground terminal of the service area of switching to the switching command information of the target air communication node in a broadcasting mode;
step M3.5: after receiving the switching command information, the service area ground terminal switches the communication connection to a target air communication node;
in particular, said step M3.5 comprises: the ground terminal in the service area receives the switching command information periodically, and the periodic interval for receiving the broadcast information is obtained according to the preset, the arrangement after deployment and/or the initial intervention information of the non-ground network.
The handover request includes context information for a ground terminal served by a source air communication node; the method comprises the steps of identity ID of a ground terminal, safety information, the number of ground terminals served by a source air communication node, space density and service type;
the switching information comprises a target aerial communication node ID, a carrier frequency, a target power, a wireless resource and a physical resource configuration;
the switching command information comprises a target aerial communication node ID and all information required for accessing the target aerial communication node, so that the ground terminal can access the target aerial communication node without reading system information, information of competitive and non-competitive random access, service interruption time of a source aerial communication node and service starting time of the target aerial communication node;
the ground terminal interrupts the communication with the source aerial communication node and establishes the communication connection with the target aerial communication node, and the steps comprise downlink synchronization establishment, timing advance, data transmission, control signaling transmission and the like.
The invention provides a non-ground network switching system without positioning capability for a terminal, which comprises:
module M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node;
specifically, the module M1 includes: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area according to the spatial position, the movement speed and the movement direction information of the source air communication node; when the source air communication node foresees that the service provided by the source air communication node to a terminal in a certain service geographic area is interrupted after a certain time, the source air communication node initiates a network side switching process;
the network side switching process comprises a switching process initiated by a source air communication node from the network side;
the method is suitable for all types of aerial communication nodes which move relative to the ground terminal, including but not limited to MEO (medium orbit) satellites, LEO (low orbit) satellites, unmanned aerial vehicles, lift-off hot air balloons and the like.
The periodicity of the calculation depends on the coverage area including the source air communication node and the number of serving terminals;
module M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information;
the candidate airborne communication node is an airborne communication node that is located around the source airborne communication node and that receives a request for spatial information from the source airborne communication node.
Specifically, the module M2 includes:
the space information request sent by the source aerial communication node comprises the identification, the current position, the movement speed and the movement direction information of the source aerial communication node;
the space information fed back by the candidate aerial communication nodes comprises the identification, the current position, the motion speed and the motion direction information of the candidate aerial communication nodes;
module M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node;
specifically, the module M3 includes:
module M3.1: a source air communication node sends a switching request to a target air communication node through a communication interface between the air communication nodes;
module M3.2: after the target air communication node receives the switching request sent by the source air communication node, the target air communication node executes resource access control and allocates air interface resources and service bearing resources for the access of the ground terminal of the service area;
module M3.3: the target air communication node providing handover information to the source air communication node as a handover confirmation;
module M3.4: informing the ground terminal of the service area of switching to the switching command information of the target air communication node in a broadcasting mode;
module M3.5: after receiving the switching command information, the service area ground terminal switches the communication connection to a target air communication node;
in particular, said module M3.5 comprises: the ground terminal in the service area receives the switching command information periodically, and the periodic interval for receiving the broadcast information is obtained according to the preset, the arrangement after deployment and/or the initial intervention information of the non-ground network.
The handover request includes context information for a ground terminal served by a source air communication node; the method comprises the steps of identity ID of a ground terminal, safety information, the number of ground terminals served by a source air communication node, space density and service type;
the switching information comprises a target aerial communication node ID, a carrier frequency, a target power, a wireless resource and a physical resource configuration;
the switching command information comprises a target aerial communication node ID and all information required for accessing the target aerial communication node, so that the ground terminal can access the target aerial communication node without reading system information, information of competitive and non-competitive random access, service interruption time of a source aerial communication node and service starting time of the target aerial communication node;
the ground terminal interrupts the communication with the source aerial communication node and establishes the communication connection with the target aerial communication node, and the steps comprise downlink synchronization establishment, timing advance, data transmission, control signaling transmission and the like.
The present invention is further described in detail by the following preferred examples:
step 1: and periodically calculating a service duration and interruption time line of the service provided by the node to the terminal in a certain service geographic area by the source LEO satellite A according to the information of the spatial position, the movement speed, the movement direction and the like of the source LEO satellite A. When source LEO satellite a anticipates that after 20 seconds, the service provided by itself to the terminals in a certain service geographical area will be interrupted, and a network-side handover procedure is initiated.
The geographic area comprises a chemical plant area and a lake, and thousands of various harmful gas sensors, water quality sensors, air temperature sensors, wind direction sensors and other internet of things terminals are deployed in the range of 200 square kilometers. A non-ground network with an LEO satellite as a core becomes a main channel for information communication between field sensing equipment of the internet of things and a service management platform of an environmental protection management department.
Step 2: source LEO satellite a makes a request for spatial information in a broadcast fashion to candidate LEO satellites.
The spatial information request includes, but is not limited to, the identification of the source LEO satellite, the current location, the movement speed, the movement direction, and other information.
LEO satellites B, C, D, E that are in the vicinity of source LEO satellite a all receive the space request information from source LEO satellite a.
And step 3: LEO satellite B and LEO satellite C feed back the space information to LEO satellite A;
LEO satellite D, E determines that the current service area of source LEO satellite a will not be in its coverage area in the future according to the current position, movement speed and movement direction of source LEO satellite a, and by combining its current position, movement speed and movement direction, and decides not to feed back its spatial information to source LEO satellite a.
LEO satellite B, C determines that the current service area of source LEO satellite a will be within its coverage area according to the current position, movement speed and movement direction of source LEO satellite a, and by combining its current position, movement speed and movement direction, decides to feed back its spatial information to source LEO satellite a. The spatial information fed back by LEO satellite B, C includes information such as the respective identity, current position, velocity of movement, direction of movement, satellite processing capabilities, satellite communications capabilities, etc.
And 4, step 4: a source LEO satellite A selects a proper target LEO satellite for a ground Internet of things terminal in a service area;
and the source LEO satellite A selects an optimal target LEO satellite, namely an LEO satellite B, according to the information such as the current position, the movement speed, the movement direction, the satellite processing capacity, the satellite communication capacity and the like fed back by the LEO satellite B, C.
And 5: a source LEO satellite A sends a switching request to a target LEO satellite B through a communication interface of the LEO satellite;
the handover request includes, but is not limited to, context information of the ground terminal served by the source air communication node, such as an identity ID, security information, etc. of the ground terminal; the switching request information comprises the number of ground internet of things terminals served by the source air communication node, the space density of the internet of things terminals, the type of internet of things sensing service and the like.
Step 6, the target LEO satellite B executes resource access control, and allocates air interface resources and bearing resources of the sensing service of the Internet of things for the access of a ground Internet of things terminal of a service area;
and 7: target LEO satellite B provides handover information to source LEO satellite a as part of a handover confirmation;
the handover information includes, but is not limited to, radio resource and physical resource configuration such as target LEO satellite ID, carrier frequency, target power, etc.
And 8: the source LEO satellite A informs the ground Internet of things terminal of switching to switching command information of the target LEO satellite B in a broadcasting mode;
the handover command message includes at least the target LEO satellite BID and all information needed to access the target LEO satellite B so that the terrestrial internet of things terminal can access the target LEO satellite B without reading the system message. In some cases, the contention-based and contention-free random access information may be included in the handover command message.
The handover command information includes a service interruption time of the source LEO satellite a and a service start time of the target LEO satellite B;
and step 9: the ground internet of things terminal receives the switching command and switches the communication connection to the target LEO satellite B;
and the ground internet of things terminal receives the broadcast information regularly. The receiving time interval ground internet of things terminal is prefabricated before deployment.
And the ground internet of things terminal interrupts the communication with the source LEO satellite A and establishes a communication connection with the target LEO satellite B, and the steps comprise downlink synchronous establishment, timing advance, data transmission and the like.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A non-terrestrial network switching method without positioning capability of a terminal is characterized by comprising the following steps:
step M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node;
step M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information;
step M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node;
the candidate airborne communication node is an airborne communication node that is located around the source airborne communication node and that receives a request for spatial information from the source airborne communication node.
2. The method for switching the non-terrestrial network without the positioning capability of the terminal according to claim 1, wherein the step M1 comprises: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area according to the spatial position, the movement speed and the movement direction information of the source air communication node; when the service provided by the source air communication node to the terminal in the service geographic area is interrupted, the source air communication node initiates a network side switching process;
the network side switching process comprises a switching process initiated by a source air communication node from the network side;
the periodicity of the calculation depends on the coverage area including the source air communication node and the number of serving terminals;
the source aerial communication nodes comprise medium orbit satellites, low orbit satellites, unmanned aerial vehicles and lift-off hot air balloons.
3. The method for switching the non-terrestrial network without the positioning capability of the terminal according to claim 1, wherein the step M2 comprises:
the space information request sent by the source aerial communication node comprises the identification, the current position, the movement speed and the movement direction information of the source aerial communication node;
the space information fed back by the candidate aerial communication nodes comprises the identification, the current position, the motion speed and the motion direction information of the candidate aerial communication nodes.
4. The method for switching the non-terrestrial network without the positioning capability of the terminal according to claim 1, wherein the step M3 comprises:
step M3.1: a source air communication node sends a switching request to a target air communication node through a communication interface between the air communication nodes;
step M3.2: after the target air communication node receives the switching request sent by the source air communication node, the target air communication node executes resource access control and allocates air interface resources and service bearing resources for the access of the ground terminal of the service area;
step M3.3: the target air communication node providing handover information to the source air communication node as a handover confirmation;
step M3.4: informing the ground terminal of the service area of switching to the switching command information of the target air communication node in a broadcasting mode;
step M3.5: after receiving the switching command information, the service area ground terminal switches the communication connection to a target air communication node;
the handover request includes context information for a ground terminal served by a source air communication node; the method comprises the steps of identity ID of a ground terminal, safety information, the number of ground terminals served by a source air communication node, space density and service type;
the switching information comprises a target aerial communication node ID, a carrier frequency, a target power, a wireless resource and a physical resource configuration;
the handover command information includes a target air communication node ID, all information required to access the target air communication node, information of contention and contention-free random access, a source air communication node service interruption time, and a target air communication node service start time.
5. The method as claimed in claim 4, wherein the step M3.5 includes: the ground terminal in the service area receives the switching command information periodically, and the periodic interval for receiving the broadcast information is obtained according to the preset, the arrangement after deployment and/or the initial intervention information of the non-ground network.
6. A non-terrestrial network switching system without a positioning capability of a terminal is characterized by comprising:
module M1: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area through the information of the source air communication node;
module M2: a source air communication node periodically sends a space information request to candidate air communication nodes in a broadcasting mode, one or more candidate air communication nodes feed back space information to the source air communication node, and the source air communication node selects a target air communication node for a ground terminal in a service area according to the fed back space information;
module M3: the target aerial communication node is switched to the target aerial communication node after the service of the source aerial communication node is interrupted according to the switching command sent by the source aerial communication node;
the candidate airborne communication node is an airborne communication node that is located around the source airborne communication node and that receives a request for spatial information from the source airborne communication node.
7. The system of claim 6, wherein the module M1 comprises: the source air communication node periodically calculates the service duration and service interruption time of the source air communication node for providing service to the terminal in the service geographic area according to the spatial position, the movement speed and the movement direction information of the source air communication node; when the service provided by the source air communication node to the terminal in the service geographic area is interrupted, the source air communication node initiates a network side switching process;
the network side switching process comprises a switching process initiated by a source air communication node from the network side;
the periodicity of the calculation depends on the coverage area including the source air communication node and the number of serving terminals;
the source aerial communication nodes comprise medium orbit satellites, low orbit satellites, unmanned aerial vehicles and lift-off hot air balloons.
8. The system of claim 6, wherein the module M2 comprises:
the space information request sent by the source aerial communication node comprises the identification, the current position, the movement speed and the movement direction information of the source aerial communication node;
the space information fed back by the candidate aerial communication nodes comprises the identification, the current position, the motion speed and the motion direction information of the candidate aerial communication nodes.
9. The system of claim 6, wherein the module M3 comprises:
module M3.1: a source air communication node sends a switching request to a target air communication node through a communication interface between the air communication nodes;
module M3.2: after the target air communication node receives the switching request sent by the source air communication node, the target air communication node executes resource access control and allocates air interface resources and service bearing resources for the access of the ground terminal of the service area;
module M3.3: the target air communication node providing handover information to the source air communication node as a handover confirmation;
module M3.4: informing the ground terminal of the service area of switching to the switching command information of the target air communication node in a broadcasting mode;
module M3.5: after receiving the switching command information, the service area ground terminal switches the communication connection to a target air communication node;
the handover request includes context information for a ground terminal served by a source air communication node; the method comprises the steps of identity ID of a ground terminal, safety information, the number of ground terminals served by a source air communication node, space density and service type;
the switching information comprises a target aerial communication node ID, a carrier frequency, a target power, a wireless resource and a physical resource configuration;
the handover command information includes a target air communication node ID, all information required to access the target air communication node, information of contention and contention-free random access, a source air communication node service interruption time, and a target air communication node service start time.
10. The method according to claim 9, wherein said module M3.5 comprises: the ground terminal in the service area receives the switching command information periodically, and the periodic interval for receiving the broadcast information is obtained according to the preset, the arrangement after deployment and/or the initial intervention information of the non-ground network.
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